Patent Publication Number: US-2020277169-A1

Title: Winch, rope guide and transmission device having clutch function

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application claims priority to and benefits of Chinese Patent Application Serial No. 201910149493.8, filed with National Intellectual Property Administration of People&#39;s Republic of China (PRC) on Feb. 28, 2019, Chinese Patent Application Serial No. 201920257882.8, filed with National Intellectual Property Administration of PRC on Feb. 28, 2019, Chinese Patent Application Serial No. 201910149845.X, filed with National Intellectual Property Administration of PRC on Feb. 28, 2019, Chinese Patent Application Serial No. 201920257640.9, filed with National Intellectual Property Administration of PRC on Feb. 28, 2019, Chinese Patent Application Serial No. 201910149808.9, filed with National Intellectual Property Administration of PRC on Feb. 28, 2019, Chinese Patent Application Serial No. 201920258158.7, filed with National Intellectual Property Administration of PRC on Feb. 28, 2019, Chinese Patent Application Serial No. 201910149487.2, filed with National Intellectual Property Administration of PRC on Feb. 28, 2019, and Chinese Patent Application Serial No. 201920258609.7, filed with National Intellectual Property Administration of PRC on Feb. 28, 2019, the entire contents of which are incorporated herein by reference. 
     TECHNICAL FIELD 
     The present disclosure relates to the field of automobile technology relating to winches, and more particularly to a winch, a rope guide, and a transmission device having a clutch function. 
     BACKGROUND 
     A winch is an onboard device mounted in engineering vehicles, off-road vehicles, and SUV sports cars, and it is mainly used for automobile rescue, loading and unloading, or hoisting goods. The winch is usually provided with a rope guide to guide a rope to avoid from being tangled up. In the related art, a reel of the winch is driven by a motor, and the rope guide is passive, that is, the rope guide has no motor drive. During a process of winding the rope around the reel or releasing the rope from the reel, the rope guide moves along an axial direction of the reel by means of a force of the rope, in which case the rope guiding effect is poor, and the rope and the rope guide are easily damaged due to high friction between the rope and the rope guide. 
     SUMMARY 
     Embodiments of the present disclosure aim to solve one of the technical problems in the related art at least to some extent. 
     To this end, embodiments of an aspect of the present disclosure provide a winch, whose rope guide is an active rope guide, thereby having a good rope guiding effect. Moreover, a reel and the rope guide are driven by a common motor, thereby reducing components and parts, simplifying the structure and control, and lowering costs. 
     Embodiments of another aspect of the present disclosure provide a rope guide. 
     Embodiments of still another aspect of the present disclosure provide a transmission device. 
     The winch according to embodiments of the first aspect of the present disclosure includes: a base seat; a reel rotatably provided to the base seat; a rope guide provided to the base seat; a transmission assembly operably connected with the rope guide; and a motor operably connected with the reel to drive the reel to rotate, and configured to drive the rope guide through the transmission assembly. 
     In the winch according to embodiments of the present disclosure, the rope guide is an active rope guide, bringing about a good rope guiding effect. Moreover, the reel and the rope guide are driven by the same motor, that is, the rope guide does not require a separate power source, which reduces the number of components and parts of the winch, simplifies the structure and control, and lowers costs. 
     In some embodiments, the winch further includes a transmission device, and the transmission assembly drives the rope guide through the transmission device. The transmission device includes: a sleeve body connected with the rope guide; a transmission shaft rotatably connected to the base seat and passing through the sleeve body, and configured to be driven to rotate by the transmission assembly; and a clutch member mounted on the sleeve body and capable of being engaged with and disengaged from the transmission shaft. When the transmission shaft rotates and is engaged with the clutch member, the clutch member is driven to move the sleeve body in an axial direction of the transmission shaft. 
     In some embodiments, an outer circumferential surface of the transmission shaft is provided with a bidirectional spiral groove extending in the axial direction of the transmission shaft; the clutch member has a first end and a second end, and the clutch member is movable between an engaged position where the first end of the clutch member is engaged in the spiral groove and a disengaged position where the first end of the clutch member is disengaged from the spiral groove. 
     In some embodiments, the sleeve body defines a first hole and a second hole therein, the first hole penetrates the sleeve body, and the transmission shaft rotatably passes through the first hole. The second hole has a first end in communication with the first hole and a second end provided with a cover plate, and the first end of the clutch member extends through the cover plate into the second hole. 
     In some embodiments, the clutch member includes a clutch shaft, an elastic member, and an engagement plate; the elastic member is provided between the cover plate and the clutch shaft to push the clutch shaft toward the transmission shaft; the engagement plate is integrally provided at a first end face of the clutch shaft and can be engaged with or disengaged from the transmission shaft; and a surface of the engagement plate facing the transmission shaft is in a concave arc shape. 
     In some embodiments, the clutch shaft has a flange, and the elastic member is configured as a coil spring that is fitted over the clutch shaft and located between the cover plate and the flange. The cover plate is provided with a through groove, the clutch shaft is provided with a stop pin, and when the stop pin is aligned with the through groove, the stop pin can extend out of the cover plate through the through groove. When the transmission shaft is engaged with the clutch member, the stop pin is located in the second hole. The stop pin can abut against an upper surface of the cover plate to stop the clutch shaft from moving along an axial direction of the second hole when the transmission shaft is disengaged from the clutch member. 
     In some embodiments, the transmission assembly is configured as a gear transmission device, and includes a ring gear mounted to the reel and a gear set meshing with the ring gear; the gear set is connected to the transmission shaft to drive the transmission shaft to rotate. 
     In some embodiments, the gear set includes: a first gear meshing with the ring gear; a second gear mounted to a common shaft together with the first gear; a third gear mounted to the transmission shaft and driven by the second gear; a fourth gear meshing with the second gear; and a fifth gear mounted to a common shaft together with the fourth gear and meshing with the third gear. 
     In some embodiments, the rope guide includes: a sliding block defining a central cavity penetrating the sliding block in a front-rear direction, and connected with the sleeve body through a safety pin; an upper rope guiding drum rotatably provided in the central cavity; a lower rope guiding drum rotatably provided in the central cavity, and opposite to and spaced apart from the upper rope guiding drum; a rope-arranging sheave shaft; a rope-arranging sheave rotatably mounted to the rope-arranging sheave shaft and located in the central cavity; and an adjustment handle connected with the rope-arranging sheave shaft to adjust the rope-arranging sheave between a tensioned position where a rope L is tensioned and a release position where the rope L is released. 
     In some embodiments, in the tensioned position, the highest point of a rope-arranging face of the rope-arranging sheave is higher than the lowest point of a rope guiding face of the upper rope guiding drum; in the release position, the highest point of the rope-arranging face of the rope-arranging sheave is lower than the highest point of a rope guiding face of the lower rope guiding drum or is flush with the highest point of the rope guiding face of the lower rope guiding drum. 
     In some embodiments, the sliding block has a first side wall and a second side wall opposite to each other in a left-right direction, the first side wall is provided with a first elongated slot extending in an up-down direction, and the second side wall is provided with a second elongated slot extending in the up-down direction. The rope-arranging sheave shaft has a first end fitted with the first elongated slot and extending out of the first elongated slot to be connected with the adjustment handle, and has a second end fitted with the second elongated slot and extending out of the second elongated slot to be connected with the adjustment handle. The first elongated slot has an upper end provided with a first recess extending rearwards, and the second elongated slot has an upper end provided with a second recess extending rearwards. In the tensioned position, the first end of the rope-arranging sheave shaft is fitted in the first recess, and the second end of the rope-arranging sheave shaft is fitted in the second recess; in the release position, the first end of the rope-arranging sheave shaft is fitted in a lower end of the first elongated slot, and the second end of the rope-arranging sheave shaft is fitted in a lower end of the second elongated slot. 
     In some embodiments, the adjustment handle includes a first side plate, a second side plate, and a grip; an upper end of the first side plate and an upper end of the second side plate are both connected to the grip; the first side plate has a lower end connected with the first end of the rope-arranging sheave shaft; and the second side plate has a lower end connected with the second end of the rope-arranging sheave shaft. The first side plate is provided with a first sliding guide groove extending along a length direction of the first side plate, and the second side plate is provided with a second sliding guide groove extending along a length direction of the second side plate. An outer wall face of the first side wall of the sliding block is provided with a first guide pin shaft fitted with the first sliding guide groove, and an outer wall face of the second side wall of the sliding block is provided with a second guide pin shaft fitted with the second sliding guide groove. 
     In some embodiments, the rope guide further includes an upper guide shaft, a lower guide shaft, a first guide roller, and a second guide roller. The first guide roller and the second guide roller are mounted to the sliding block and located at a front opening of the central cavity, and the first guide roller and the second guide roller extend in the up-down direction and are spaced apart from each other in the left-right direction. The upper rope guiding drum is rotatably mounted to the upper guide shaft and is slidable along an axial direction of the upper guide shaft; the lower rope guiding drum is rotatably mounted to the lower guide shaft and is slidable along an axial direction of the lower guide shaft. The upper guide shaft and the lower guide shaft pass through the sliding block, and the sliding block is slidable along the upper guide shaft and the lower guide shaft. 
     The rope guide according to embodiments of the second aspect of the present disclosure includes: a sliding block defining a central cavity penetrating the sliding block in a first direction (e.g., front-rear direction), and having a first side wall and a second side wall opposite to each other in a second direction (e.g., left-right direction); an upper rope guiding drum rotatably provided in the central cavity; a lower rope guiding drum rotatably provided in the central cavity, and opposite to and spaced apart from the upper rope guiding drum; a rope-arranging sheave shaft; a rope-arranging sheave rotatably mounted to the rope-arranging sheave shaft and located in the central cavity; and an adjustment handle connected with the rope-arranging sheave shaft to adjust the rope-arranging sheave between a tensioned position where a rope is tensioned and a release position where the rope is released. 
     For the rope guide according to the embodiments of the present disclosure, by providing the rope-arranging sheave, the upper rope guiding drum, and the lower rope guiding drum, the rope can be tidily wound around and arranged onto the reel; by providing the adjustment handle, the rope-arranging sheave can be conveniently moved between the tensioned position and the release position. In such a way, the structure is simple, the cost is low, and the adjustment is reliable. 
     In some embodiments, a central axis of the lower rope guiding drum is aligned with a central axis of the upper rope guiding drum in a third direction (e.g., an up-down direction), and the rope-arranging sheave is arranged behind the upper rope guiding drum and the lower rope guiding drum. 
     In some embodiments, in the tensioned position, the highest point of a rope-arranging face of the rope-arranging sheave is higher than the lowest point of a rope guiding face of the upper rope guiding drum; in the release position, the highest point of the rope-arranging face of the rope-arranging sheave is lower than the highest point of a rope guiding face of the lower rope guiding drum or is flush with the highest point of the rope guiding face of the lower rope guiding drum. 
     In some embodiments, the first side wall is provided with a first elongated slot extending in a third direction (e.g., an up-down direction), and the second side wall is provided with a second elongated slot extending in the up-down direction. The rope-arranging sheave shaft has a first end fitted with the first elongated slot and extending out of the first elongated slot to be connected with the adjustment handle, and has a second end fitted with the second elongated slot and extending out of the second elongated slot to be connected with the adjustment handle. 
     In some embodiments, the first elongated slot has an upper end provided with a first recess extending rearwards, and the second elongated slot has an upper end provided with a second recess extending rearwards. In the tensioned position, the first end of the rope-arranging sheave shaft is fitted in the first recess, and the second end of the rope-arranging sheave shaft is fitted in the second recess; in the release position, the first end of the rope-arranging sheave shaft is fitted in a lower end of the first elongated slot, and the second end of the rope-arranging sheave shaft is fitted in a lower end of the second elongated slot. 
     In some embodiments, the adjustment handle includes a first side plate, a second side plate, and a grip; an upper end of the first side plate and an upper end of the second side plate are both connected to the grip; the first side plate has a lower end connected with the first end of the rope-arranging sheave shaft; and the second side plate has a lower end connected with the second end of the rope-arranging sheave shaft. The first side plate is provided with a first sliding guide groove extending along a length direction of the first side plate, and the second side plate is provided with a second sliding guide groove extending along a length direction of the second side plate. An outer wall face of the first side wall of the sliding block is provided with a first guide pin shaft fitted with the first sliding guide groove, and an outer wall face of the second side wall of the sliding block is provided with a second guide pin shaft fitted with the second sliding guide groove. 
     In some embodiments, the rope guide further includes a first guide roller and a second guide roller. The first guide roller and the second guide roller are mounted to the sliding block and located at a front opening of the central cavity. The first guide roller and the second guide roller extend in the up-down direction and are spaced apart from each other in the left-right direction. 
     In some embodiments, the rope guide further includes an upper guide shaft, a lower guide shaft, a first guide roller, and a second guide roller. The first guide roller and the second guide roller are mounted to the sliding block and located at a front opening of the central cavity; the first guide roller and the second guide roller extend in the up-down direction and are spaced apart from each other in the left-right direction. The upper rope guiding drum is rotatably mounted to the upper guide shaft and is slidable along an axial direction of the upper guide shaft; the lower rope guiding drum is rotatably mounted to the lower guide shaft and is slidable along an axial direction of the lower guide shaft; the upper guide shaft and the lower guide shaft pass through the sliding block, and the sliding block is slidable along the upper guide shaft and the lower guide shaft. 
     The transmission device according to embodiments of the third aspect of the present disclosure includes: a sleeve body; a transmission shaft having an outer circumferential surface provided with a spiral groove, passing through the sleeve body, and configured to be rotatable with respect to the sleeve body; and a clutch member having a first end and a second end, mounted to the sleeve body, and configured to be movable between an engaged position and a disengaged position. In the engaged position, the first end of the clutch member is engaged in the spiral groove, such that the clutch member is driven to move the sleeve body along an axial direction of the transmission shaft when the transmission shaft rotates; and, in the disengaged position, the first end of the clutch member is disengaged from the spiral groove. 
     For the transmission device according to the embodiments of the present disclosure, since the clutch member cooperates with the transmission shaft, it is possible to disconnect the clutch member with the transmission shaft when the free end of the rope is subjected to an excessive load, such that the transmission shaft no longer drives the rope guide to operate, thereby protecting the transmission shaft. 
     In some embodiments, the sleeve body has a first hole and a second hole therein; the first hole penetrates the sleeve body, and the second hole is in communication with the first hole; the transmission shaft is rotatably fitted in the first hole, and the clutch member can extend into the first hole through the second hole. 
     In some embodiments, a central axis of the first hole is orthogonal to a central axis of the second hole, and the central axis of the second hole passes through the center of the first hole. 
     In some embodiments, a central axis of the transmission shaft coincides with the central axis of the first hole. 
     In some embodiments, the second hole has a first portion in communication with the first hole, and the second hole has a second portion that is provided with a cover plate, and the first end of the clutch member passes through the cover plate and extends into the second hole. 
     In some embodiments, the clutch member includes a clutch shaft, an elastic member, and an engagement plate; the elastic member is arranged between the cover plate and the clutch shaft to push the clutch shaft toward the transmission shaft; and the engagement plate is arranged at a first end of the clutch shaft and can be engaged with or disengaged from the spiral groove. 
     In some embodiments, the engagement plate is integrally provided at a first end face of the clutch shaft, and a surface of the engagement plate facing the transmission shaft is in a concave arc shape. 
     In some embodiments, the clutch shaft has a flange, and the elastic member is configured as a coil spring that is fitted over the clutch shaft and located between the cover plate and the flange; the cover plate is provided with a through groove, the clutch shaft is provided with a stop pin, and when the stop pin is aligned with the through groove, the stop pin can extend out of the cover plate through the through groove; in the engaged position, the stop pin is located in the second hole; in the disengaged position, the stop pin abuts against an upper surface of the cover plate to stop the clutch shaft from moving along an axial direction of the second hole. 
     In some embodiments, the clutch shaft has a second end provided with a clutch handle, and the cover plate is threaded in the second end of the second hole. 
     In some embodiments, the spiral groove is configured as a bidirectional spiral groove. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a perspective view of a winch according to an embodiment of the present disclosure. 
         FIG. 2  is a perspective view of a winch according to an embodiment of the present disclosure, in which a motor and a reel are not illustrated. 
         FIG. 3  is a sectional view of a rope guiding apparatus according to an embodiment of the present disclosure. 
         FIG. 4  is a sectional view of a transmission device according to an embodiment of the present disclosure. 
         FIG. 5  is an exploded view of a transmission device according to an embodiment of the present disclosure. 
         FIG. 6  is a sectional view of a transmission device according to an embodiment of the present disclosure, in which a clutch member is engaged with a transmission shaft. 
         FIG. 7  is a sectional view of a transmission device according to an embodiment of the present disclosure, in which a clutch member is disengaged from a transmission shaft. 
         FIG. 8  is a perspective view of a rope guide according to an embodiment of the present disclosure. 
         FIG. 9  is a sectional view of a rope guide according to an embodiment of the present disclosure. 
         FIG. 10  is a sectional view illustrating that a guide shaft, a sliding sleeve, a bushing, and a rope guiding drum are fitted together according to an embodiment of the present disclosure. 
         FIG. 11  is a perspective view of a rope guide according to an embodiment of the present disclosure, in which a first guide pin shaft and a first guide groove are illustrated, but a guide shaft is not illustrated. 
         FIG. 12  is a perspective view of a rope guide according to an embodiment of the present disclosure, in which a second guide pin shaft and a second guide groove are illustrated, but a guide shaft is not illustrated. 
         FIG. 13  is a perspective view illustrating that a sliding block and a guide roller are fitted together according to an embodiment of the present disclosure, in which a first elongated slot and a first recess are illustrated. 
         FIG. 14  is a perspective view illustrating that a sliding block and a guide roller are fitted together according to an embodiment of the present disclosure, in which a second elongated slot and a second recess are illustrated. 
         FIG. 15  is a sectional view of a winch according to an embodiment of the present disclosure, illustrating a state of a rope L when the rope is retracted under no load. 
         FIG. 16  is a sectional view of a winch according to an embodiment of the present disclosure, illustrating a state of a rope L when the rope is released under no load. 
         FIG. 17  is a sectional view of a winch according to an embodiment of the present disclosure, illustrating a state of a rope L when the rope is retracted under a load. 
         FIG. 18  is a sectional view of a winch according to an embodiment of the present disclosure, illustrating a state of a rope L when the rope is released under a load. 
     
    
    
     DETAILED DESCRIPTION 
     Embodiments of the present disclosure will be described in detail hereinafter and examples of the embodiments will be illustrated in the drawings. The embodiments described below with reference to the drawings are illustrative and are used to generally understand the present disclosure. The embodiments shall not be construed to limit the present disclosure. In the specification, it is to be understood that terms such as “central,” “longitudinal,” “transverse,” “length,” “width,” “thickness,” “upper,” “lower,” “front,” “rear,” “left,” “right,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” “outer,” “clockwise,” “counterclockwise,” “axial,” “radial,” and “circumferential” should be construed to refer to the orientation or position relationship as then described or as shown in the drawings under discussion. These relative terms are for convenience of description and do not indicate or imply that the present disclosure have a particular orientation, or be constructed and operated in a particular orientation. Thus, these terms shall not be construed to limit the present disclosure. 
     A winch according to embodiments of the present disclosure will be described below with reference to  FIGS. 1-18 . 
     As illustrated in  FIGS. 1 and 2 , the winch, according to embodiments of the present disclosure, includes a base seat  1 , a reel  2 , a transmission assembly  3 , a rope guide  5 , and a motor  7 . The reel  2  is rotatably coupled to the base seat  1 , and the rope guide  5  is coupled to the base seat  1 . The motor  7  is connected to the reel  2  to drive the reel  2  to rotate, so as to wind a rope L around the reel  2  or release the rope L from the reel  2 . The transmission assembly  3  is connected between the motor  7  and the rope guide  5 , so that the motor  7  drives the rope guide  5  through the transmission assembly  3 . 
     In the winch, according to embodiments of the present disclosure, the rope guide  5  is an active rope guide, that is, the rope guide is driven by the motor  7 , thereby resulting in a good rope guiding effect. Moreover, the reel  2  and the rope guide  5  are driven by the same motor  7 , that is, the rope guide  5  does not require a separate power source, which reduces the number of components and parts, simplifies the structure and control, and lowers costs. 
     In some embodiments, the winch also includes a transmission device  4 , and the transmission assembly  3  drives the rope guide  5  by the transmission device  4 . Specifically, in such embodiments, the transmission device  4  connects the transmission assembly  3  with the rope guide  5 , whereby the motor  7  drives the rope guide  5  through the transmission assembly  3  and the transmission device  4  in sequence. 
     The transmission device  4 , according to embodiments of the present disclosure, will be described in detail below with reference to the drawings. 
     As illustrated in  FIGS. 2-7 , the transmission device  4  includes a sleeve body  41 , a transmission shaft  42 , and a clutch member  43 . The sleeve body  41  is connected to the rope guide  5 , and the transmission shaft  42  is rotatably disposed to the base seat  1 , passes through the sleeve body  41 , and is driven to rotate by the transmission assembly  3 . In other words, as illustrated in  FIG. 2 , the transmission shaft  42  has a right end coupled to the transmission assembly  3  to drive the transmission shaft  42  to rotate by means of the transmission assembly  3 , and a left end capable of passing through the sleeve body  41 . 
     The clutch member  43  is mounted on the sleeve body  41 , and the clutch member  43  can be engaged with and disengaged from the transmission shaft  42 . When the transmission shaft  42  rotates and is engaged with the clutch member  43 , the transmission shaft  42  drives the clutch member  43  to move in an axial direction of the transmission shaft  42  (e.g., a left-right direction in  FIG. 2 ), so that the clutch member  43  drives the sleeve body  41  to move along the axial direction of the transmission shaft  42 . It can be understood that when the clutch member  43  is engaged with the transmission shaft  42 , a driving force of the motor  7  can be transmitted to the rope guide  5  to drive the rope guide  5 ; after the clutch member  43  is disengaged from the transmission shaft  42 , the driving force of the motor  7  cannot be transmitted to the rope guide  5 . 
     The transmission device  4  according to embodiments of the present disclosure has a clutch function, and the clutch member  43  is engaged with the transmission shaft  42  to drive the rope guide  5  through the transmission shaft  42 . Since the strength bearable by the transmission shaft  42  is limited, the transmission shaft  42  may be easily damaged if the transmission shaft  42  still drives the rope guide  5  in a case of a large load at a free end L 1  of the rope L. Thus, the transmission device  4  according to embodiments of the present disclosure can disengage the clutch member  43  from the transmission shaft  42  when the load of the free end L 1  of the rope L is large, so as to interrupt the power transmission between the rope guide  5  and the transmission shaft  42 , thereby preventing the transmission shaft  42  from being damaged, and prolonging the service life of the transmission device  4 . 
     In some embodiments, an outer circumferential surface of the transmission shaft  42  is provided with a spiral groove  420  extending in the axial direction of the transmission shaft  42 . The clutch member  43  has a first end and a second end, and the clutch member  43  is movable between an engaged position and a disengaged position. In the engaged position, as illustrated in  FIG. 6 , the first end of the clutch member  43  is engaged in the spiral groove  420 ; in the disengaged position, as illustrated in  FIG. 7 , the first end of the clutch member  43  is disengaged from the spiral groove  420 . In other words, in the engaged position, a lower end of the clutch member  43  is engaged in the spiral groove  420 , and in the disengaged position, the lower end of the clutch member  43  is disengaged from the spiral groove  420 . 
     The spiral groove  420  may be a bidirectional spiral groove. When the lower end of the clutch member  43  is engaged in the spiral groove  420 , the clutch member  43  reciprocates along the axial direction of the transmission shaft  42  as the transmission shaft  42  rotates. In other words, the transmission shaft  42  may be configured as a bidirectional lead screw. 
     In some embodiments, the sleeve body  41  has a first hole  410  and a second hole  411  therein. The first hole  410  penetrates the sleeve body  41 , and the second hole  411  is in connection with the first hole  410 . The transmission shaft  42  is rotatably fitted in the first hole  410 , and the clutch member  43  may extend into the first hole  410  through the second hole  411 . 
     In some embodiments, the second hole  411  has a first end in communication with the first hole  410 , and a second end provided with a cover plate  44 . The first end of the clutch member  43  extends through the cover plate  44  into the second hole  411 . In other words, as illustrated in  FIGS. 5 and 6 , the first hole  410  is located at a lower end of the second hole  411 , the lower end of the second hole  411  is in communication with the first hole  410 , and an upper end of the second hole  411  is provided with the cover plate  44 ; the lower end of the clutch member  43  extends through the cover plate  44  into the second hole  411 , and may extend through the second hole  411  into the first hole  410  to be engaged with the transmission shaft  42 . 
     Specifically, the cover plate  44  is threaded into the second end of the second hole  411  to facilitate removal of the cover plate  44  from the sleeve body  41 . A central axis of the first hole  410  is orthogonal to a central axis of the second hole  411 , and the central axis of the second hole  411  passes through a center of the first hole  410 . A s illustrated in  FIG. 5 , the central axis of the first hole  410  extends in a left-right direction, the central axis of the second hole  411  extends in an up-down direction, and seen from a cross section of the sleeve body  41 , the central axis of the second hole  411  passes through the center of the first hole  410 . Further, specifically, a central axis of the transmission shaft  42  coincides with the central axis of the first hole  410 , that is, the direction in which the first hole  410  penetrates the sleeve body  41  coincides with the axial direction of the transmission shaft  42 . 
     In some embodiments, the clutch member  43  includes a clutch shaft  431 , an elastic member  432 , and an engagement plate  433 . The elastic member  432  is disposed between the cover plate  44  and the clutch shaft  431  to push the clutch shaft  431  toward the transmission shaft  42 , and the engagement plate  433  is disposed at a first end of the clutch shaft  431  and can be engaged with or disengaged from the transmission shaft  42 . 
     As illustrated in  FIGS. 5-7 , the clutch shaft  431  has a flange  4310  adjacent to its lower end. The flange  4310  has a cross sectional area greater than a cross sectional area of the remaining part of the clutch shaft  431 . In some embodiments, the elastic member  432  is a coil spring which is provided between a lower surface of the cover plate  44  and an upper end face of the flange  4310  and is wound around the clutch shaft  431 . The engagement plate  433  is located below the flange  4310  and is connected to a lower end of the clutch shaft  431 . Thus, under the action of an elastic force of the elastic member  432 , the elastic member  432  pushes the upper end face of the flange  4310  to move the engagement plate  433  downwards, such that the engagement plate  433  is engaged with the spiral groove  420  of the transmission shaft  42 . 
     In some embodiments, a surface of the engagement plate  433  facing the transmission shaft  42  is in a concave arc shape. As illustrated in  FIGS. 5-7 , a lower surface of the engagement plate  433  has an upwardly concave arc shape to be better engaged with the spiral groove  420  in the outer circumferential surface of the transmission shaft  42 . 
     In a specific example, the engagement plate  433  is integrally provided to a first end face of the clutch shaft  431 . In other words, as illustrated in  FIG. 5 , the engagement plate  433  is provided to a lower end face of the clutch shaft  431  and integrally formed with the clutch shaft  431 . 
     In some embodiments, the cover plate  44  is provided with a through groove  440 , and the clutch shaft  431  is provided with a stop pin  45 . The stop pin  45  may extend out of the cover plate  44  through the through groove  440  when aligned with the through groove  440 . In the engaged position where the engagement plate  433  is engaged with the spiral groove  420 , the stop pin  45  is located in the second hole  411 . In the disengaged position where the engagement plate  433  is disengaged from the spiral groove  420 , the stop pin  45  abuts against an upper surface of the cover plate  44  to stop the clutch shaft  431  from axially moving along the second hole  411 . 
     In other words, as illustrated in  FIGS. 5-7 , the cover plate  44  is provided with the through groove  440  that penetrates the thickness of the cover plate  44  in the up-down direction. In the engaged position where the engagement plate  433  is engaged with the spiral groove  420  as illustrated in  FIG. 6 , the stop pin  45  is located in the second hole  411 . When the engagement plate  433  is disengaged from the spiral groove  420 , the clutch shaft  431  moves upwards to drive the stop pin  45  to move upwards, and the stop pin  45  is aligned with the through groove  440 , whereby the stop pin  45  can be driven by the clutch shaft  431  to move upwards until it protrudes from the cover plate  44 . After the clutch shaft  431  protrudes through the cover plate  44 , the clutch shaft  431  is rotated and hence drives the stop pin  45  to rotate, such that the stop pin  45  is offset from the through groove  440 , and the stop pin  45  abuts against an upper end face of the cover plate  44 , thereby preventing the clutch shaft  431  from moving downwards, so as to maintain the disengagement state of the engagement plate  433  and the spiral groove  420 , as illustrated in  FIG. 7 . 
     In some embodiments, the clutch shaft  431  has a second end provided with a clutch handle  46 . In other words, as illustrated in  FIGS. 4-7 , an upper end of the clutch shaft  431  is provided with the clutch handle  46 , and the clutch handle  46  is located above the cover plate  44  and the sleeve body  41 . By means of the clutch handle  46 , the clutch shaft  431  can be easily rotated and can be moved up and down, to achieve engagement and disengagement of the engagement plate  433  and the transmission shaft  42 . 
     In some embodiments, the transmission assembly  3  is a gear transmission device. The transmission assembly  3  includes a ring gear  30  mounted to the reel  2  and a gear set  31  that meshes with the ring gear  30 . The gear set  31  is coupled to the transmission shaft  42  to drive the transmission shaft  42  to rotate. As illustrated in  FIGS. 1-2 , the reel  2  has a left end connected to a motor shaft of the motor  7  and a right end provided with the ring gear  30 , and the ring gear  30  is configured as an outer ring gear. The ring gear  30  is wound around the right end of the reel  2 , a right end face of the reel  2  is provided with an end plate (not illustrated), and a right end face of the ring gear  30  is connected to a left end face of the end plate, such that the ring gear  30  rotates with the reel  2  as the motor  7  drives the reel  2  to rotate. 
     In some embodiments, the gear set  31  includes a first gear  311 , a second gear  312 , and a third gear  313 . The first gear  311  meshes with the ring gear  30 , the second gear  312  and the first gear  311  are mounted to a common shaft, the third gear  313  is mounted to the transmission shaft  42 , and the third gear  313  meshes with the second gear  312  to be driven by the second gear  312 . Terms such as “first” and “second” are used herein for purposes of description and are not intended to indicate or imply relative importance or significance or to imply the number of indicated technical features. Thus, the feature defined with “first” and “second” may comprise one or more of this feature. 
     In other words, as illustrated in  FIG. 2 , the first gear  311  is coupled to a left end of a connecting shaft  316 , the second gear  312  is coupled to a right end of the connecting shaft  316 , and the third gear  313  meshes with the second gear  312  and is coupled to the right end of the transmission shaft  42 . The second gear  312  has a diameter smaller than a diameter of the first gear  311 , and the third gear  313  has a diameter larger than the diameters of the first gear  311  and the second gear  312 . Thus, the ring gear  30  can sequentially drive the first gear  311 , the second gear  312 , the third gear  313 , and the transmission shaft  42  during its rotation along with the reel  2 , and in turn the transmission shaft  42  drives the sleeve body  41  to move along the axial direction of the transmission shaft  42 . 
     In one example, the gear set  31  also includes a fourth gear  314  and a fifth gear  315 . The fourth gear  314  meshes with the second gear  312 , the fifth gear  315  is mounted on the same shaft as the fourth gear  314 , and the fifth gear  315  meshes with the third gear  313 . As illustrated in  FIG. 5 , the fourth gear  314  directly meshes with the second gear  312 ; the fifth gear  315  is provided to a right end face of the fourth gear  314  and arranged coaxially with the fourth gear  314 , and the fifth gear  315  has a diameter smaller than a diameter of the fourth gear  314 ; the third gear  313  meshes with the fifth gear  315 . 
     The gear set  31  is received in a casing  310 . In other words, the first gear  311 , the connecting shaft  316 , the second gear  312 , the third gear  313 , the fourth gear  314 , and the fifth gear  315  are covered by the casing  310  to protect the gear set  31 . 
     The rope guide according to embodiments of the present disclosure will be described in detail below with reference to the drawings. 
     As illustrated in  FIGS. 8-14 , the rope guide  5  according to embodiments of the present disclosure includes a sliding block  50 , a rope guiding drum  51 , a rope-arranging sheave shaft  52 , a rope-arranging sheave  53 , and an adjustment handle  54 . The sliding block  50  has a central cavity  500  penetrating in a front-rear direction. Front and rear surfaces of the sliding block  50  are open, so that the rope L can pass through the sliding block  50  in the front-rear direction. The sliding block  50  is coupled to the sleeve body  41 , such that when the transmission shaft  42  drives the sleeve body  41  to move in the axial direction of the transmission shaft  42 , the sliding block  50  moves in the axial direction of the transmission shaft  42  along with the sleeve body  41 . 
     The rope guiding drum  51  includes an upper rope guiding drum  511  and a lower rope guiding drum  512 . The upper rope guiding drum  511  is rotatably disposed in the central cavity  500 , the lower rope guiding drum  512  is rotatably disposed in the central cavity  500 , and the lower rope guiding drum  512  is opposite to and spaced apart from the upper rope guiding drum  511 . As illustrated in  FIGS. 8 and 9 , the upper rope guiding drum  511  and the lower rope guiding drum  512  are both disposed in the central cavity  500 , and central axes of the two are parallel to each other; the upper rope guiding drum  511  and the lower rope guiding drum  512  are opposite to and spaced apart from each other in the up-down direction. 
     The rope-arranging sheave  53  is rotatably mounted to the rope-arranging sheave shaft  52  and located in the central cavity  500 . Therefore, when the rope L is wound around the reel  2  (e.g., retracting the rope) or unwound from the reel  2  (e.g., releasing the rope), the rope L bypasses the highest point of a rope-arranging face of the rope-arranging sheave  53  and passes through a gap between the upper rope guiding drum  511  and the lower rope guiding drum  512 , in which way the rope L is guided. 
     The adjustment handle  54  is coupled to the rope-arranging sheave shaft  52  to adjust the rope-arranging sheave  53  between a tensioned position where the rope L is tensioned and a release position where the rope L is released. In other words, the adjustment handle  54  is connected to the rope-arranging sheave shaft  52 , and by adjusting the adjustment handle  54 , the rope-arranging sheave shaft  52  can drive the rope-arranging sheave  53  to move, thereby causing the movement of the rope-arranging sheave  53  between the tensioned position where the rope L is tensioned and the release position where the rope L is released. When the rope is retracted, the rope L is subjected to certain tension to ensure that the rope L is closely arranged on the reel  2 . Thus, when the rope is retracted with the free end L 1  of the rope L in an unloaded state (e.g., rope retraction under no load), the rope-arranging sheave  53  is in the tensioned position to ensure that the rope L is tidily wound around the reel  2 . 
     For the rope guide, according to the embodiments of the present disclosure, the rope-arranging sheave  53  can be conveniently adjusted by the adjustment handle  54 , so as to move between the tensioned position where the rope L is tensioned and the release position where the rope L is released, so that the structure is simple, the cost is low, and the adjustment is reliable. 
     In one example, the central axis of the lower rope guiding drum  512  is aligned with the central axis of the upper rope guiding drum  511  in the up-down direction. In other words, as illustrated in  FIG. 9 , the lower rope guiding drum  512  and the upper rope guiding drum  511  have the same axial length, a left end face of the lower rope guiding drum  512  is aligned with a left end face of the upper rope guiding drum  511  in the up-down direction, and a right end face of the lower rope guiding drum  512  is aligned with a right end face of the upper rope guiding drum  511  in the up-down direction. In the up-down direction, the upper rope guiding drum  511  and the lower rope guiding drum  512  are spaced apart by a predetermined distance, thereby forming the gap between the upper rope guiding drum  511  and the lower rope guiding drum  512  to allow the passage of the rope L. 
     In some embodiments, the rope-arranging sheave  53  and the rope guiding drum  51  are offset from each other in the front-rear direction. Specifically, as illustrated in  FIG. 8 , the rope-arranging sheave  53  is located behind the upper rope guiding drum  511  and the lower rope guiding drum  512 . 
     It could be understood that the rope-arranging sheave  53  is movable in the up-down direction, and the free end L 1  of the rope L bypasses the rope-arranging sheave  53  above the rope-arranging sheave  53  and passes between the upper rope guiding drum  511  and the lower rope guiding drum  512 . When the rope-arranging sheave  53  moves upwards from the release position to the tensioned position, the distance between the rope-arranging sheave  53  and the upper rope guiding drum  511  in the up-down direction is reduced, thereby tensioning the rope L. 
     In some embodiments, in the tensioned position, the highest point of the rope-arranging face of the rope-arranging sheave  53  is higher than the lowest point of a rope guiding face of the upper rope guiding drum  511 ; in the release position, the highest point of the rope-arranging face of the rope-arranging sheave  53  is lower than the highest point of a rope guiding face of the lower rope guiding drum  512  or is substantially flush with the highest point of the rope guiding face of the lower rope guiding drum  512 . 
     In some embodiments, as illustrated in  FIGS. 13 and 14 , the sliding block  50  has a first side wall  501  and a second side wall  502  opposite to each other in the left-right direction. The first side wall  501  is provided with a first elongated slot  503  extending in the up-down direction, and the second side wall  502  is provided with a second elongated slot  504  extending in the up-down direction. The rope-arranging sheave shaft  52  has a first end  521  fitted with the first elongated slot  503  and extending out of the first elongated slot  503  to be connected with the adjustment handle  54 , and it has a second end  522  fitted with the second elongated slot  504  and extending out of the second elongated slot  504  to be connected with the adjustment handle  54 . 
     An upper end of the first elongated slot  503  is provided with a first recess  505  extending rearwards, and an upper end of the second elongated slot  504  is provided with a second recess  506  extending rearwards. In the tensioned position, the first end of the rope-arranging sheave shaft  52  is fitted in the first recess  505 , and the second end of the rope-arranging sheave shaft  52  is fitted in the second recess  506 . In the release position, the first end of the rope-arranging sheave shaft  52  is fitted in a lower end of the first elongated slot  503 , and the second end of the rope-arranging sheave shaft  52  is fitted in a lower end of the second elongated slot  504 . 
     It could be understood that, as illustrated in  FIGS. 11-14 , when the first end  521  of the rope-arranging sheave shaft  52  is located in the first recess  505  and the second end  522  of the rope-arranging sheave shaft  52  is located in the second recess  506 , the rope-arranging sheave  53  is in the tensioned position where the rope L is tensioned, so that when the rope L is wound around the reel  2  (rope retraction) with the free end L 1  of the rope L under no load (i.e., an unloaded state), the rope-arranging sheave  53  tensions the rope, so that the rope L is not slack and will not be messed up. 
     In some embodiments, the adjustment handle  54  includes a first side plate  541 , a second side plate  542 , and a grip  543 . An upper end of the first side plate  541  and an upper end of the second side plate  542  are both connected to the grip  543 ; a lower end of the first side plate  541  is connected with the first end  521  of the rope-arranging sheave shaft  52 , and a lower end of the second side plate  542  is connected with the second end  522  of the rope-arranging sheave shaft  52 . In other words, as illustrated in  FIGS. 11 and 12 , one end of the first side plate  541  is connected to the first end  521  of the rope-arranging sheave shaft  52 , and the first side plate  541  extends upwards and is inclined forwards. One end of the second side plate  542  is connected to the second end  522  of the rope-arranging sheave shaft  52 , and the second side plate  542  extends upwards and is inclined forwards. The first side plate  541  and the second side plate  542  are disposed opposite to each other and in parallel. The grip  543  is located between the upper end of the first side plate  541  and the upper end of the second side plate  542 . One end of the grip  543  is connected to a left side face of the first side plate  541 , and the other end of the grip  543  is connected to a right side face of the second side plate  542  adjacent to the first side plate  541 . 
     The first side plate  541  is provided with a first sliding guide groove  5410  extending along a length direction of the first side plate  541 , and the second side plate  542  is provided with a second sliding guide groove  5420  extending along a length direction of the second side plate  542 . An outer wall face of the first side wall  501  of the sliding block  50  (e.g., a right wall face of the first side wall  501  illustrated in  FIG. 11 ) is provided with a first guide pin shaft  544  fitted with the first sliding guide groove  5410 , and an outer wall face of the second side wall  502  of the sliding block  50  (e.g., a left wall face of the second side wall  502  illustrated in  FIG. 11 ) is provided with a second guide pin shaft  545  fitted with the second sliding guide groove  5420 . 
     In other words, as illustrated in  FIGS. 11 and 12 , the first sliding guide groove  5410  penetrates the thickness of the first side plate  541  and extends along the length direction of the first side plate  541 . The second sliding guide groove  5420  penetrates the thickness of the second side plate  542  and extends along the length direction of the second side plate  542 . The first guide pin shaft  544  is located in front of and above the lower end of the first side plate  541 , and the second guide pin shaft  545  is located in front of and above the lower end of the second side plate  542 . 
     Each of the first guide pin shaft  544  and the second guide pin shaft  545  includes a base body and a flange. The base body of the first guide pin shaft  544  is fitted in the first sliding guide groove  5410 , and the flange of the first guide pin shaft  544  is located on a right side of the first side plate  541 , to allow the first side plate  541  to move forwards and upwards between the first side wall  501  and the flange of the first guide pin shaft  544 . The base body of the second guide pin shaft  545  is fitted in the second sliding guide groove  5420 , and the flange of the second guide pin shaft  545  is located on a left side of the second side plate  542 , to allow the second side plate  542  to move forwards and upwards between the second side wall  502  and the flange of the second guide pin shaft  545 . 
     It could be understood that by manipulating the grip  543 , the rope-arranging sheave  53  may be moved between the tensioned position and the release position by means of the first side plate  541  and the second side plate  542 . The base body of the first guide pin shaft  544  is slidable in the first sliding guide groove  5410 , and the second guide pin shaft  545  is slidable in the second sliding guide groove  5420 , so as to guide the movement of the first side plate  541  and the second side plate  542 . 
     In some embodiments, the rope guide  5  further includes a guide roller  55 . The guide roller  55  includes a first guide roller  551  and a second guide roller  552 . The first guide roller  551  and the second guide roller  552  are mounted to the sliding block  50  and located at a front opening of the central cavity  500 . The first guide roller  551  and the second guide roller  552  extend in the up-down direction and are spaced apart from each other in the left-right direction. 
     In other words, as illustrated in  FIGS. 11-14 , the first guide roller  551  and the second guide roller  552  both extend in the up-down direction and are spaced apart in the left-right direction. An upper end of the first guide roller  551  and an upper end of the second guide roller  552  are both mounted to a top wall of the sliding block  50 , and a lower end of the first guide roller  551  and a lower end of the second guide roller  552  are both mounted on a bottom wall of the sliding block  50 . Both the first guide roller  551  and the second guide roller  552  are rotatable about their respective axes. The distance between the first guide roller  551  and the second guide roller  552  spaced apart in the left-right direction should be equal to or smaller than the dimension of the central cavity  500  of the sliding block  50  in the left-right direction (i.e., a distance between an inner surface of the first side wall  501  and an inner surface of the second side wall  502 ), such that the rope L is guided between the first guide roller  551  and the second guide roller  552  and will not contact or rub against the first side wall  501  and the second side wall  502  of the sliding block  50 . 
     In some embodiments, the rope guide  5  further includes a guide shaft  56 , and the guide shaft  56  includes an upper guide shaft  561  and a lower guide shaft  562 . The upper rope guiding drum  511  is rotatably mounted to the upper guide shaft  561  and is slidable along an axial direction of the upper guide shaft  561 ; the lower rope guiding drum  512  is rotatably mounted to the lower guide shaft  562  and is slidable along an axial direction of the lower guide shaft  562 . The upper guide shaft  561  and the lower guide shaft  562  pass through the sliding block  50 , and the sliding block  50  is slidable along the upper guide shaft  561  and the lower guide shaft  562 . 
     In other words, as illustrated in  FIGS. 8-10 , the upper guide shaft  561  and the lower guide shaft  562  each extend in the left-right direction, so that the upper guide shaft  561  and the lower guide shaft  562  are parallel to each other. The upper guide shaft  561  sequentially passes through the first side wall  501 , the upper rope guiding drum  511 , and the second side wall  502 . The lower guide shaft  562  sequentially passes through the first side wall  501 , the lower rope guiding drum  512 , and the second side wall  502 . As illustrated in  FIGS. 1 and 2 , the lower guide shaft  562  is located below the upper guide shaft  561 . In some embodiments, the rope guide  5  further includes a telescopic sheath  57 . The telescopic sheath  57  includes a first upper telescopic sheath  571  and a second upper telescopic sheath  572  as well as a first lower telescopic sheath  573  and a second lower telescopic sheath  574 . The first upper telescopic sheath  571  is fitted over a first end of the upper guide shaft  561  (e.g., a left end of the upper guide shaft  561  illustrated in  FIG. 1 ), and the second upper telescopic sheath  572  is fitted over a second end of the upper guide shaft  561  (e.g., a right end of the upper guide shaft  561  illustrated in  FIG. 1 ); the first lower telescopic sheath  573  is fitted over a first end of the lower guide shaft  562  (e.g., a left end of the lower guide shaft  562  illustrated in  FIG. 1 ), and the second lower telescopic sheath  574  is fitted over a second end of the lower guide shaft  562  (e.g., a right end of the lower guide shaft  562  illustrated in  FIG. 1 ). 
     In other words, the upper guide shaft  561  is provided with two telescopic sheaths, and the sheaths are located at the left and right sides of the sliding block  50 ; the lower guide shaft  562  is also provided with two telescopic sheaths, and the sheaths are located at the left and right sides of the sliding block  50 . When the sliding block  50  is adjacent to the left end of the upper guide shaft  561  and the left end of the lower guide shaft  562 , the sheath at the left side of the sliding block  50  is compressed, and the sheath at the right side of the sliding block  50  is extended, as illustrated in  FIG. 1 . 
     In some embodiments, the rope guide  5  further includes a sliding sleeve  58 . The sliding sleeve  58  includes an upper sliding sleeve  581  and a lower sliding sleeve  582 . The upper sliding sleeve  581  and the lower sliding sleeve  582  are provided in the sliding block  50  and penetrate the sliding block  50 . The upper sliding sleeve  581  and the lower sliding sleeve  582  are opposite to and spaced apart from each other. In other words, as illustrated in  FIG. 9 , the upper sliding sleeve  581  and the lower sliding sleeve  582  both extend in the left-right direction and are spaced apart from each other in the up-down direction, and one end of the upper sliding sleeve  581  and one end of the lower sliding sleeve  582  are mounted to the first side wall  501 , while the other end of the upper sliding sleeve  581  and the other end of the lower sliding sleeve  582  are mounted to the second side wall  502 . 
     The upper rope guiding drum  511  is rotatably fitted over the upper sliding sleeve  581 . The upper guide shaft  561  passes through the upper sliding sleeve  581 , and the upper sliding sleeve  581  is slidable along the axial direction of the upper guide shaft  561 . The lower rope guiding drum  512  is rotatably fitted over the lower sliding sleeve  582 . The lower guide shaft  562  passes through the lower sliding sleeve  582 , and the lower sliding sleeve  582  is slidable along the axial direction of the lower guide shaft  562 . 
     In other words, as illustrated in  FIG. 9 , the upper sliding sleeve  581  is fitted over the upper guide shaft  561  and is slidable in the left-right direction with respect to the upper guide shaft  561 . The upper rope guiding drum  511  is fitted over the upper sliding sleeve  581  and is rotatable with respect to the upper sliding sleeve  581 . The lower sliding sleeve  582  is fitted over the lower guide shaft  562  and is slidable in the left-right direction with respect to the lower guide shaft  562 . The lower rope guiding drum  512  is fitted over the lower sliding sleeve  582  and is rotatable with respect to the lower sliding sleeve  582 . 
     In one example, the rope guide  5  further includes a bushing  59 . The bushing  59  includes an upper bushing  591  and a lower bushing  592 . The upper bushing  591  and the lower bushing  592  are opposite to and spaced apart from each other. The upper bushing  591  is fitted in the upper sliding sleeve  581 , the upper guide shaft  561  passes through the upper bushing  591 , and the upper bushing  591  is slidable with respect to the axial direction of the upper guide shaft  561 . The lower bushing  592  is fitted in the lower sliding sleeve  582 , the lower guide shaft  562  passes through the lower bushing  592 , and the lower bushing  592  is slidable with respect to the lower guide shaft  562 . 
     As illustrated in  FIG. 9 , two upper bushings  591  are provided and spaced apart in the left-right direction: one of the upper bushings  591  is fitted to a left end of the upper sliding sleeve  581 , and the other one of the upper bushings  591  is fitted to a right end of the upper sliding sleeve  581 . The upper guide shaft  561  passes through the two upper bushings  591  sequentially. 
     Two lower bushings  592  are provided and spaced apart in the left-right direction: one of the lower bushings  592  is fitted to a left end of the lower sliding sleeve  582 , and the other one of the lower bushings  592  is fitted to a right end of the lower sliding sleeve  582 . The lower guide shaft  562  passes through the two lower bushings  592  sequentially. 
     In some embodiments, the sliding block  50  is connected with the sleeve body  41  by a safety pin  6 . The sliding block  50  and the sleeve body  41  are connected by the safety pin  6 , and after the load is greater than the strength bearable by the transmission shaft  42 , the safety pin  6  can be broken to interrupt the power transmission between the transmission shaft  42  and the sliding block  50 , and the transmission shaft  42  can no longer drive the sliding block  50  to move in the left-right direction, thereby ensuring the safety of the transmission shaft  42 . 
     In embodiments of the present disclosure, as illustrated in  FIGS. 1-3 , the base seat  1 , the transmission device  4 , and the rope guide  5  constitute a rope guiding apparatus. 
     In some embodiments, as illustrated in  FIGS. 1 and 4 , the base seat  1  includes a first base plate  11  and a second base plate  12  opposite to each other and spaced apart in the left-right direction, and one end of the transmission shaft  42  is mounted to the first base plate  11  while the other end of the transmission shaft  42  is mounted to the second base plate  12 . 
     One end of the upper guide shaft  561  is mounted to the first base plate  11 , and the other end of the upper guide shaft  561  sequentially passes through the first side wall  501 , the upper rope guiding drum  511 , and the second side wall  502 , and it is mounted to the second base plate  12 . One end of the lower guide shaft  562  is also mounted to the first base plate  11 , and the other end of the lower guide shaft  562  sequentially passes through the first side wall  501 , the lower rope guiding drum  512 , and the second side wall  502 , and it is mounted to the second base plate  12 . 
     The operation of the winch according to embodiments of the present disclosure will now be described with reference to  FIGS. 15-18 . 
     When the free end L 1  of the rope L is under no load and the rope L needs to be wound around the reel  2  (e.g., rope retraction under no load), as illustrated in  FIG. 15 , the engagement plate  433  of the clutch member  43  is engaged with the spiral groove  420  of the transmission shaft  42  to allow the sleeve body  41  to be driven by the transmission shaft  42 , so as to move the sliding block  50  in the left-right direction. Both ends of the rope-arranging sheave shaft  52  are located in the first recess  505  and the second recess  506  respectively, so that the rope-arranging sheave  53  is in the tensioned position, thereby tensioning the rope L. In other words, a part of the rope L located between the reel  2  and the lower rope guiding drum  512  is curved. 
     The rope L bypasses the rope-arranging sheave  53  from above the rope-arranging sheave  53 , and passes between the upper rope guiding drum  511  and the lower rope guiding drum  512 . Since the highest point of the rope-arranging face of the rope-arranging sheave  53  is higher than the lowest point of the rope guiding face of the upper rope guiding drum  511 , the rope L is tensioned and tidily wound around the reel  2 . 
     When the free end L 1  of the rope L is under no load and the rope L needs to be unwound from the reel  2  (e.g., rope release under no load), as illustrated in  FIG. 16 , the engagement plate  433  of the clutch member  43  is disengaged from the spiral groove  420  of the transmission shaft  42 , so that the transmission shaft  42  can no longer drive the sliding block  50  to move. Both ends of the rope-arranging sheave shaft  52  are located in the lower ends of the first elongated slot  503  and the second elongated slot  504  respectively, so that the rope-arranging sheave  53  is in the release position. The rope L bypasses the rope-arranging sheave  53  and passes between the upper rope guiding drum  511  and the lower rope guiding drum  512 , and the highest point of the rope-arranging face of the rope-arranging sheave  53  is lower than the highest point of the rope guiding face of the lower rope guiding drum  512  or is substantially flush with the highest point of the rope guiding face of the lower rope guiding drum  512 . 
     When the free end L 1  of the rope L is under a relatively large load (exceeding the strength bearable by the transmission shaft  42 ), and the rope L needs to be wound around the reel  2  (rope retraction under a load), as illustrated in  FIG. 17 , the engagement plate  433  of the clutch member  43  is disengaged from the spiral groove  420  of the transmission shaft  42 , so that the transmission shaft  42  can no longer drive the sliding block  50  to move, thereby protecting the safety of the transmission shaft  42 . Both ends of the rope-arranging sheave shaft  52  are located in the lower ends of the first elongated slot  503  and the second elongated slot  504  to bring the rope-arranging sheave  53  into the release position. The rope L bypasses the rope-arranging sheave  53  and passes between the upper rope guiding drum  511  and the lower rope guiding drum  512 , and the highest point of the rope-arranging face of the rope-arranging sheave  53  is lower than the highest point of the rope guiding face of the lower rope guiding drum  512  or is substantially flush with the highest point of the rope guiding face of the lower rope guiding drum  512 . 
     When the free end L 1  of the rope L is under a relatively large load (exceeding the strength bearable by the transmission shaft  42 ), and the rope L needs to be unwound from the reel  2  (rope release under a load), as illustrated in  FIG. 18 , the engagement plate  433  of the clutch member  43  is disengaged from the spiral groove  420  of the transmission shaft  42 , so that the transmission shaft  42  can no longer drive the sliding block  50  to move. Both ends of the rope-arranging sheave shaft  52  are located in the lower ends of the first elongated slot  503  and the second elongated slot  504  to bring the rope-arranging sheave  53  into the release position. The rope L bypasses the rope-arranging sheave  53  and passes between the upper rope guiding drum  511  and the lower rope guiding drum  512 , and the highest point of the rope-arranging face of the rope-arranging sheave  53  is lower than the highest point of the rope guiding face of the lower rope guiding drum  512  or is substantially flush with the highest point of the rope guiding face of the lower rope guiding drum  512 . 
     Reference throughout this specification to “an embodiment,” “some embodiments,” “an example,” “a specific example,” or “some examples,” means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. Thus, the appearances of the phrases in various places throughout this specification are not necessarily referring to the same embodiment or example of the present disclosure. Furthermore, the particular features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples. Additionally, different embodiments or examples as well as features in different embodiments or examples described in the present disclosure can be combined by those skilled in the art without any contradiction. 
     In the present disclosure, unless specified or limited otherwise, the terms “mounted,” “connected,” “coupled,” “fixed,” “provided,” and the like are used broadly, and may be, for example, fixed connections, detachable connections, or integral connections; may also be mechanical or electrical connections or mutual communication; may also be direct connections or indirect connections via intervening structures; may also be inner communications of two elements or mutual interaction of two elements, which can be understood by those skilled in the art according to specific situations. 
     In the present disclosure, unless specified or limited otherwise, a structure in which a first feature is “on” or “below” a second feature may include an embodiment in which the first feature is in direct contact with the second feature, and may also include an embodiment in which the first feature and the second feature are not in direct contact with each other, but are contacted via an additional feature formed therebetween. Furthermore, a first feature “on,” “above,” or “on top of” a second feature may include an embodiment in which the first feature is right or obliquely “on,” “above,” or “on top of” the second feature, or just means that the first feature is at a height higher than that of the second feature; while a first feature “below,” “under,” or “on bottom of” a second feature may include an embodiment in which the first feature is right or obliquely “below,” “under,” or “on bottom of” the second feature, or just means that the first feature is at a height lower than that of the second feature. 
     Although embodiments of the present disclosure have been shown and described, it would be appreciated by those skilled in the art that the above embodiments are explanatory and cannot be construed to limit the present disclosure, and changes, modifications, alternatives, and variations can be made in the above embodiments without departing from the scope of the present disclosure. 
     It is intended that the specification, together with the drawings, be considered exemplary only, where exemplary means an example. As used herein, the singular forms “a,” “an,” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. Additionally, the use of “or” is intended to include “and/or,” unless the context clearly indicates otherwise. 
     While this patent document contains many specifics, these should not be construed as limitations on the scope of any invention or of what may be claimed, but rather as descriptions of features that may be specific to particular embodiments of particular inventions. Certain features that are described in this patent document in the context of separate embodiments can also be implemented in combination in a single embodiment. Conversely, various features that are described in the context of a single embodiment can also be implemented in multiple embodiments separately or in any suitable subcombination. Moreover, although features may be described above as acting in certain combinations and even initially claimed as such, one or more features from a claimed combination can in some cases be excised from the combination, and the claimed combination may be directed to a subcombination or variation of a subcombination. 
     Similarly, while operations are depicted in the drawings in a particular order, this should not be understood as requiring that such operations be performed in the particular order shown or in sequential order, or that all illustrated operations be performed, to achieve desirable results. Moreover, the separation of various system components in the embodiments described in this patent document should not be understood as requiring such separation in all embodiments. 
     Only a few implementations and examples are described, and other implementations, enhancements and variations can be made based on what is described and illustrated in this patent document.