Patent Publication Number: US-2023148616-A1

Title: Shrimp peeling device

Description:
CROSS REFERENCE TO RELATED APPLICATIONS 
     The present application is a Continuation application of PCT Application No. PCT/CN2020/130985 filed on Nov. 24, 2020, which claims the benefit of Chinese Patent Application No. 202010672985.8 filed on Jul. 13, 2020. All the above are hereby incorporated by reference in their entirety. 
    
    
     TECHNICAL FIELD 
     The present disclosure relates to the technical field of food processing devices, and in particular, to a shrimp peeling device. 
     BACKGROUND 
     With the rapid development of transportation, coastal seafood has become quite popular in inland areas. For shrimps, due to the high requirements for feeding and transportation, the transportation cost of live shrimps is high. Therefore, preliminary shrimp peeling and deveining are required. Currently, shrimp processing enterprises focus on processing frozen peeled shrimps and frozen shrimp products. 
     At present, there are mainly two methods for peeling shrimps: manual peeling and machine peeling. The manual peeling mainly has defects such as slow peeling, low efficiency, and easy hands scratching of production workers by blades during back opening and deveining. The manual peeling is a traditional production method. The machine peeling involves two main methods. One is to use the rotating and rubbing two rollers for peeling. A decapitated shrimp is placed between the two rollers without precise positioning. A shrimp shell is rubbed through multiple rotations of the rollers, such that the shrimp shell is loosened and clamped away by rotating the rollers, and shrimp meat is left. The disadvantages are as follows: raw materials need to be soaked for a long time, the peeling is not thorough, the yield is low, etc. The other is a semi-automatic peeling machine. The decapitated shrimp is manually placed in a tray groove of a conveying belt one by one and then fed into the machine. Through a conveying device, the decapitated shrimp is sequentially subjected to such functional stations as positioning and clamping, back opening, peeling and deveining, thereby peeling the decapitated shrimp. The semi-automatic peeling machine can implement peeling, but the efficiency is low; moreover, the machine can only cut the shrimp and remove the shell, such that the shelled shrimp is incomplete, because shell residues are remained on the shrimp meat. Due to these disadvantages, the existing shrimp peeling mechanical equipment have a small range of application, and cannot be promoted on a large scale. 
     SUMMARY 
     The technical problem to be solved by the present disclosure is: how to quickly cut and open the back or abdomen of a shrimp, and perform peeling by squeezing to improve the production efficiency. 
     To solve the above technical problems, the present disclosure provides a shrimp peeling device, including a frame, a driving member, a first conveying wheel, a second conveying wheel, a conveying belt, a clamping frame, a cutting assembly, and a shell removing frame. The driving member is configured to provide a driving force and mounted on the frame. The first conveying wheel is connected to an output end of the driving member and mounted on the frame. The second conveying wheel is mounted on the frame. The conveying belt is in transmission connection with the first conveying wheel and the second conveying wheel. The clamping frame is provided with a first pathway for the conveying belt to pass through from back to front, a processing opening communicated with the first pathway is formed in a top end of the clamping frame, and when the conveying belt passes through the first pathway, two sides of the conveying belt are relatively bent upward to clamp and convey a shrimp in a vertical state. The cutting assembly is disposed at the processing opening and capable of extending into the first pathway to open the back or abdomen of a shrimp clamped by the conveying belt. The shell removing frame is located on a front side of the clamping frame and provided with a second pathway for the conveying belt to pass through from back to front; the second pathway includes a limiting cavity and a narrowing cavity sequentially communicated from back to front; the narrowing cavity is narrower than the limiting cavity; a discharge port is formed in a top end of the shell removing frame, and the discharge port is located at a connection position between the limiting cavity and the narrowing cavity and communicated with the limiting cavity; and when the conveying belt passes through the connection position between the limiting cavity and the narrowing cavity, the narrowing cavity narrows the conveying belt to squeeze the shrimp to obtain shrimp meat outputted through the discharge port and a shrimp shell carried away through the conveying belt. 
     As a preferred solution, a longitudinal section of the first pathway is U-shaped. 
     As a preferred solution, the longitudinal section of the first pathway is V-shaped. 
     As a preferred solution, viewed along a longitudinal section of the first pathway, the first pathway includes a first cavity and a second cavity sequentially communicated from top to bottom, a width of the first cavity remains substantially the same from top to bottom, and a width of the second cavity gradually decreases from top to bottom. 
     As a preferred solution, the limiting cavity and the narrowing cavity are connected through a guide surface, and the guide surface is gradually inclined upward from back to front. 
     As a preferred solution, the cutting assembly includes a first transmission wheel, a connection plate, a second transmission wheel, a transmission belt, and a cutter head. The first transmission wheel is connected to the output end of the driving member. One end of the connection plate is rotatably connected to the output end of the driving member. The second transmission wheel is rotatably connected to the other end of the connection plate. The transmission belt is in transmission connection between the first transmission wheel and the second transmission wheel. The cutter head is mounted on the second transmission wheel. 
     As a preferred solution, the transmission belt includes a first transmission section and a second transmission section sequentially connected end to end, both the first transmission section and the second transmission section are in transmission connection with the first transmission wheel and the second transmission wheel, and the first transmission section and the second transmission section are arranged in an intersection manner between the first transmission wheel and the second transmission wheel. 
     As a preferred solution, the cutting assembly is provided with a rotation shaft connected to the second transmission wheel. The cutter head includes a first limiting plate, a first base plate, a cutting knife, a second base plate, and a second limiting plate sequentially arranged along an axial direction of the rotation shaft. A diameter of the first limiting plate and a diameter of the second limiting plate are both larger than a diameter of the first base plate and a diameter of the second base plate, such that an outer edge of the first limiting plate, an outer edge of the second limiting plate, an outer edge of the first base plate, and an outer edge of the second base plate form an annular groove for accommodating an object to be cut. The first base plate and the second base plate are detachably connected to the rotation shaft, and a diameter of the cutting knife is larger than the diameter of the first base plate and the diameter of the second base plate, such that a blade of the cutting knife extends to the annular groove. 
     As a preferred solution, the diameter of the cutting knife is smaller than the diameter of the first limiting plate and the diameter of the second limiting plate. 
     As a preferred solution, one end of the rotation shaft is connected to the second transmission wheel, a fixed element is detachably arranged at the other end of the rotation shaft, the first limiting plate is fixedly arranged on the rotation shaft, the second limiting plate is detachably connected to the rotation shaft, and the second limiting plate abuts against the fixed element. 
     Compared with the prior art, the shrimp peeling device provided by the present disclosure has the following beneficial effects: 
     In the present disclosure, through the first pathway inside the clamping frame, the conveying belt is upwards bent and folded in half to clamp and convey the shrimp, and the shrimp can be kept in the vertical state. When the shrimp to be processed passes through the processing opening, the cutting assembly rotates to cut the back or abdomen of the shrimp, and the cut shrimp is conveyed to the shell removing frame. When the shrimp reaches the narrowing cavity through the limiting cavity, the narrowing cavity narrows the conveying belt, which squeezes the shrimp through a frictional force, such that the shrimp meat slides out from the shrimp shell, and then the shrimp meat is discharged from the discharge port. The conveying belt carries the shrimp shell away to obtain the peeled shrimp. It is not necessary to precisely determine the position of each shrimp. Therefore, the device has such advantages as simple structure and high production efficiency. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG.  1    is a schematic diagram of an overall structure of a shrimp peeling device according to a preferred embodiment of the present disclosure. 
         FIG.  2    is a schematic diagram of an internal structure from another perspective of  FIG.  1   . 
         FIG.  3    is a stereoscopic schematic structural diagram of a clamping frame in a shrimp peeling device according to a preferred embodiment of the present disclosure. 
         FIG.  4    is a cross-sectional side view of a clamping frame in a shrimp peeling device according to a preferred embodiment of the present disclosure. 
         FIG.  5    is a cross-sectional side view of a clamping frame in a shrimp peeling device according to a second embodiment of the present disclosure. 
         FIG.  6    is a stereoscopic schematic structural diagram of a clamping frame in a shrimp peeling device according to a third embodiment of the present disclosure. 
         FIG.  7    is a cross-sectional side view of a clamping frame in a shrimp peeling device according to a third embodiment of the present disclosure. 
         FIG.  8    is a partially sectional view of a shell removing frame in a shrimp peeling device according to a preferred embodiment of the present disclosure. 
         FIG.  9    is a cross-sectional side view of a shell removing frame in a shrimp peeling device according to a preferred embodiment of the present disclosure. 
         FIG.  10    is a schematic diagram of a working state of a cutting assembly in a shrimp peeling device according to a preferred embodiment of the present disclosure. 
         FIG.  11    is a stereoscopic schematic structural diagram of a cutting assembly in a shrimp peeling device according to a preferred embodiment of the present disclosure. 
         FIG.  12    is a schematic structural diagram from another perspective of  FIG.  11   . 
         FIG.  13    is a cross-sectional side view of a cutting assembly in a shrimp peeling device according to a preferred embodiment of the present disclosure. 
     
    
    
     REFERENCE NUMERALS 
     
         
         
           
               100 . Frame; 
               200 . Driving member;  210 . Output end; 
               300 . First conveying wheel;  400 . Second conveying wheel;  500 . Conveying belt; 
               600 . Clamping frame;  610 . First pathway;  611 . First cavity;  612 . second cavity;  620 . Processing opening;  630 . First side wall surface;  640 . Second side wall surface;  650 . Arc wall surface;  660 . First top wall surface;  670 . Second top wall surface; 
               700 . Cutting assembly;  710 . First transmission wheel;  720 . Connection plate;  730 . Second transmission wheel;  740 . Rotation shaft;  750 . Transmission belt;  751 . First transmission section;  752 . Second transmission section;  760 . Cutter head;  761 . First limiting plate;  762 . First base plate;  763 . Cutting knife;  764 . Second base plate;  765 . Second limiting plate;  766 . Annular groove;  767 . Fixed element;  768 . First arc surface;  769 . Second arc surface; 
               800 . Shell removing frame;  810 . Second pathway;  811 . Limiting cavity;  812 . Narrowing cavity;  820 . Discharge port;  830 . Guide surface;  840 . Third side wall surface;  850 . Fourth side wall surface;  860 . Fifth side wall surface;  870 . Sixth side wall surface;  880 . Guide plate;  890 . Collection plate; 
               900 . Support plate. 
           
         
       
    
     DETAILED DESCRIPTION 
     The specific implementations of the present disclosure are described in more detail below with reference to the accompanying drawings and examples. The following embodiments are illustrative of the present disclosure and should not be construed as limiting of the scope of the present disclosure. 
     It should be understood that in the description of the present disclosure, orientations or positional relationships indicated by terms such as “upper”, “lower”, “front”, “rear”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside” and “outside” are all based on what are illustrated in the drawings, and such terms are used herein for ease and simplification of description of the present disclosure rather than indicating or implying that the stated device or element must have a specific orientation or must be constructed and operated in a specific orientation, and thus cannot be construed as limitations to the present disclosure. 
     It should be understood that in the description of the present disclosure, the terms “interconnection”, “connection” and “fixation” etc. are intended to be understood in a broad sense. For example, the “connection” may be a fixed connection, removable connection or integral connection; may be a mechanical connection or welding connection; may be a direct connection or indirect connection using a medium; and may be a communication or interaction between two elements, unless otherwise clearly specified and limited. Those of ordinary skill in the art may understand specific meanings of the above terms in the present disclosure based on a specific situation. 
     As shown in  FIG.  1    and  FIG.  2   , a preferred embodiment of the present disclosure provides a shrimp peeling device, including a frame  100 , a driving member  200 , a first conveying wheel  300 , a second conveying wheel  400 , a conveying belt  500 , a clamping frame  600 , a cutting assembly  700 , and a shell removing frame  800 . The driving member  200  is configured to provide a driving force and mounted on the frame  100 . The first conveying wheel  300  is connected to an output end of the driving member  200  and mounted on the frame  100 . The second conveying wheel  400  is mounted on the frame  100 . The conveying belt  500  is in transmission connection with the first conveying wheel  300  and the second conveying wheel  400 . The clamping frame  600  is provided with a first pathway  610  for the conveying belt  500  to pass through from back to front, a processing opening  620  communicated with the first pathway  610  is formed in a top end of the clamping frame  600 , and when the conveying belt  500  passes through the first pathway  610 , two sides of the conveying belt  500  are relatively bent upward to clamp and convey a shrimp in a vertical state. The cutting assembly  700  is disposed at the processing opening  620  and capable of extending into the first pathway  610  to open the back or abdomen of a shrimp clamped by the conveying belt  500 . The shell removing frame  800  is located on a front side of the clamping frame  600  and provided with a second pathway  810  for the conveying belt  500  to pass through from back to front; the second pathway  810  includes a limiting cavity  811  and a narrowing cavity  812  sequentially communicated from back to front; the narrowing cavity  812  is narrower than the limiting cavity  811 ; a discharge port  820  is formed in a top end of the shell removing frame  800 , and the discharge port  820  is located at a connection position between the limiting cavity  811  and the narrowing cavity  812  and communicated with the limiting cavity  811 ; and when the conveying belt  500  passes through the connection position between the limiting cavity  811  and the narrowing cavity  812 , the narrowing cavity  812  narrows the conveying belt  500  to squeeze the shrimp to obtain shrimp meat outputted through the discharge port  820  and a shrimp shell carried away through the conveying belt  500 . 
     According to the shrimp peeling device based on the above technical features, through the first pathway  610  inside the clamping frame  600 , the conveying belt  500  is upwards bent and folded in half to clamp and convey the shrimp, and the shrimp can be kept in the vertical state. When the shrimp to be processed passes through the processing opening  620 , the cutting assembly  700  rotates to cut the back or abdomen of the shrimp, and the cut shrimp is conveyed to the shell removing frame  800 . When the shrimp reaches the narrowing cavity  811  through the limiting cavity  812 , the narrowing cavity  812  narrows the conveying belt  500 , which squeezes the shrimp through a frictional force, such that the shrimp meat slides out from the shrimp shell, and then the shrimp meat is discharged from the discharge port  820 . The conveying belt  500  carries the shrimp shell away to obtain the peeled shrimp. It is not necessary to precisely determine the position of each shrimp. Therefore, the device has such advantages as simple structure and high production efficiency. 
     In this embodiment, as shown in  FIG.  3    and  FIG.  4   , a longitudinal section of the first pathway  610  is U-shaped. That is, a first side wall surface  630  and a second side wall surface  640  are provided inside the clamping frame  600 . The first side wall surface  630  and the second side wall surface  640  are relatively arranged to define the first pathway  610 . The first side wall surface  630  is parallel to the second side wall surface  640 , and a bottom end of the first side wall surface  630  is connected to a bottom end of the second side wall surface  640  through an arc wall surface  650 , such that the first side wall surface  630 , the second side wall surface  640 , and the arc wall surface  650  form the U-shaped first pathway  610 . The first conveying wheel  300  and the second conveying wheel  400  tension the conveying belt  500 , the shrimp is flatly placed on the conveying belt  500 , and when the shrimp is conveyed to the clamping frame  600 , the flatly placed shrimp can be clamped vertically under the action of the first side wall surface  630  and the second side wall surface  640 , and is conveyed along with the conveying belt  500 . Moreover, the shrimp is squeezed by the conveying belt  500  to be straightened for convenient opening of the back or abdomen by cutting, thereby positioning and conveying the shrimp in an oriented vertical state of back upward and abdomen downward, or back downward and abdomen upward, and providing an accurate positioning attitude for operation steps of back opening, deveining, etc. in shrimp processing. The conveying belt  500  employs a soft flat belt, such as a PVC belt and a nylon belt. 
     As another equivalent embodiment, as shown in  FIG.  5   , the longitudinal section of the first pathway  610  is V-shaped. That is, the first side wall surface  630  and the second side wall surface  640  are provided inside the clamping frame  600 . The bottom end of the first side wall surface  630  and the bottom end of the second side wall surface  640  are inclined toward the inner side of the first pathway  610  to define a V shape. Therefore, the conveying belt  500  is also limited and bent upwards to form the V shape. Because the width of sections 1-5 of the shrimp is larger than that of sections 6-7, and the first pathway  610  is set in a V shape having a narrower bottom end, the conveying belt  500  clamps and straightens the sections 1-5 of the shrimp. The shrimp is squeezed, such that the sections 6-7 of a tail portion are bent toward a direction where the shrimp is naturally bent, and the sections 6-7 of the narrower part of the shrimp are bent downward and located at the bottom of the V-shaped conveying belt  500 , as shown in  FIG.  10   . Therefore, when the shrimp passes through the cutting assembly  700 , only the sections 1-5 of the shrimp are cut, while the sections 6-7 of the shrimp are bent downward into the bottom of the V-shaped conveying belt  500  and are not cut. The boundary of cutting and non-cutting of the shrimp shell of the shrimp is between the sections 5-6, which is not an absolutely accurate boundary, such that back-opened phoenix-tailed prawn products with the sections 6-7 of shrimp shell retained can be processed in the subsequent shell removing stage. 
     As a third equivalent embodiment, as shown in  FIG.  6    and  FIG.  7   , viewed along the longitudinal section of the first pathway  610 , the first pathway  610  includes a first cavity  611  and a second cavity  612  sequentially communicated from top to bottom. The width of the first cavity  611  remains substantially the same from top to bottom, and the width of the second cavity  612  gradually decreases from top to bottom. The upper half section of the first side wall surface  630  and the upper half section of the second side wall surface  640  form a U shape similar to the first cavity  611 , and the lower half section of the first side wall surface  630  and the lower half section of the second side wall surface  640  form a V shape similar to the second cavity  612 , to define that the first pathway  610  is in a U-V shape. Therefore, the conveying belt  500  is also limited and bent upwards to form the U-V shape. Because the width of the sections 1-5 of the shrimp is larger than that of the sections 6-7, and the first pathway  610  is set in a V shape having a narrower bottom end, the conveying belt  500  clamps the sections 1-5 of the shrimp. The shrimp is squeezed, such that the sections 6-7 of the tail portion are bent toward the direction where the shrimp is naturally bent, and the sections 6-7 of the narrower part of the shrimp are bent downward and located at the bottom of the U-V-shaped conveying belt  500 , i.e., located in the second cavity  612 , as shown in  FIG.  10   . The first cavity  611  of the first pathway  610  is wider and therefore can accommodate the shrimp having a larger volume, and is more fitted with the shape of the shrimp to further widen the range of species of shrimps to be processed. Therefore, when the shrimp passes through the cutting assembly  700 , only the sections 1-5 of the shrimp are cut, while the sections 6-7 of the shrimp are bent downward into the bottom of the U-V-shaped conveying belt  500  and are not cut. The boundary of cutting and non-cutting of the shrimp shell of the shrimp is between the sections 5-6, which is not an absolutely accurate boundary, such that back-opened phoenix-tailed prawn products with the sections 6-7 of shrimp shell retained can be processed in the subsequent shell removing stage. 
     In this embodiment, as shown in  FIG.  4   , a first top wall surface  660  extending toward the inner side of the first pathway  610  is provided at the top end of the first side wall surface  630 , and a second top wall surface  670  extending toward the inner side of the first pathway  610  is provided at the top end of the second side wall surface  640  to surround the first pathway  610 , thereby preventing the cutting assembly  700  during rotation from being taken away by the shrimp in the cutting process. 
     The first top wall surface  660  and the second top wall surface  670  are both arranged extending obliquely above the inner side of the first pathway  610 , such that the first top wall surface  660  and the second top wall surface  670  are combined into a figure-eight shape, and the first pathway  610  has a larger conveying area for accommodating the shrimp, thereby improving the processing capability of the shrimp having a larger volume. 
     In this embodiment, as shown in  FIG.  3   , the processing opening  620  is shorter than a bracket body, is narrower than the first pathway  610 , and is surrounded in all sides, such that the cutting assembly  700  only cuts the shrimp, cannot affect the conveying of the shrimp, and prevents the shrimp from being removed from an opening at the top end of the clamping frame  600  in the cutting process. The processing opening  620  is rectangular to facilitate the accommodation of a circular cutter head  760 , and the height of the first pathway  610  is larger than the width of the first pathway  610 , such that the shrimp can be clamped and conveyed in the vertical state. 
     In this embodiment, as shown in  FIG.  8    and  FIG.  9   , the limiting cavity  811  and the narrowing cavity  812  are connected through a guide surface  830 , and the guide surface  830  is gradually inclined upward from back to front. After being cut, the shrimp is continuously conveyed, and is transited to the narrowing cavity  812  through the guide surface  830  for squeezing when passing through the connection between the limiting cavity  811  and the narrowing cavity  812 , and then the shrimp meat is squeezed out. Under the action of an inertia force, the shrimp meat is ejected upwards along the guide surface  830  gradually inclined upwards and is conveyed outside through the discharge port  820 . Finally, the peeled shrimp is collected. 
     A third side wall surface  840 , a fourth side wall surface  850 , a fifth side wall surface  860 , and a sixth side wall surface  870  are provided inside the shell removing frame  800 . The third side wall surface  840  and the fourth side wall surface  850  are relatively arranged to form the limiting cavity  811 . The fifth side wall surface  860  and the sixth side wall surface  870  are relatively arranged to form the narrowing cavity  812  communicated with the limiting cavity  811 . The third side wall surface  840  and the fifth side wall surface  860  are connected through the guide surface  830 , and the fourth side wall surface  850  and the sixth side wall surface  870  are connected through the guide surface  830 . The guide surfaces  830  on both sides narrow the left and right sides of the conveying belt  500  to improve the peeling capability to the cut shrimp. The width of the narrowing cavity  812  only allows the conveying belt  500  folded in half to pass through. The discharge port  820  is shorter than the limiting cavity  811 , such that the front and rear ends of the discharge port  820  are surrounded to ensure that the shrimp meat can be discharged only from the discharge port  820 . The limiting cavity  811  is as high as the narrowing cavity  812  to ensure that the conveying belt  500  can pass through the second pathway  810  along the horizontal direction. 
     Furthermore, the guide surface  830  may be an arc surface for transitional connection, such that the conveying belt  500  is subjected to transitional squeezing; and the guide surface  830  may also be in a stepped shape directly formed by flat surfaces, which is set according to the species of shrimps to be processed. 
     In this embodiment, as shown in  FIG.  1   , the discharge port  820  is provided with a guide plate  880  for guiding a shrimp collection direction. The shrimp meat is discharged from the discharge port after peeling, thereby obtaining an inertia force of moving to the front side. Therefore, the guide plate  880  stops and guides the shrimp to one side of the shell removing frame  800  for collection. 
     Furthermore, a collection plate  890  is provided on a side edge of the shell removing frame  800 , and the collection plate  890  conveys the shrimp meat into a collection bucket, thereby implementing the collection of the shrimp meat. 
     In this embodiment, a support plate  900  mounted on the frame  100  is further included. The support plate  900  is located between the first conveying wheel  300  and the second conveying wheel  400 . The shell removing frame  800  and the clamping frame  600  are arranged on the support plate  900  along the front and rear sides. By adjusting the position of the support plate  900 , the position where the conveying belt  500  is bent upwards and folded in half is changed. 
     In this embodiment, as shown in  FIG.  10    to  FIG.  13   , the cutting assembly  700  includes a first transmission wheel  710 , a connection plate  720 , a second transmission wheel  730 , a transmission belt  750 , and a cutter head  760 . The first transmission wheel  710  is connected to the output end  210  of the driving member  200 . One end of the connection plate  720  is rotatably connected to the output end  210  of the driving member  200  through a bearing seat. The second transmission wheel  730  is rotatably connected to the other end of the connection plate  720 . The transmission belt  750  is in transmission connection between the first transmission wheel  710  and the second transmission wheel  730 . The cutter head  760  is mounted on the second transmission wheel  730 . The cutter head  760  is driven to cut by means of transmission. The connection plate  720  is rotatably connected to the output end  210  of the driving member  200 . The cutter head  760  can slightly rotate with the output end  210  of the driving member  200  as the center, such that in the cutting process, the cutter head  760  can freely float up and down automatically along with the size and height of the shrimp, the cutting step is ensured not to be affected by the shrimp different in size, and fixed-depth back or abdomen opening by cutting can be implemented. 
     To ensure that the shrimp can be cut during conveying, the rotational speed of the cutter head  760  and the conveying speed of the conveying belt  500  need to have a certain differential speed, and the linear speed of the blade of the cutter head  760  is higher than the conveying speed of the conveying belt  500 , or the rotational direction of the cutter head  760  is opposite to the conveying direction of the conveying belt  500 . 
     In this embodiment, the structure in which the rotational direction of the cutter head  760  is opposite to the conveying direction of the conveying belt  500  is used, and a same driving member  200  is configured to operate the conveying belt  500  and the cutter head  760  at the same time, such that the structure is simpler and more compact. The transmission belt  750  includes a first transmission section  751  and a second transmission section  752  sequentially connected end to end, both the first transmission section  751  and the second transmission section  752  are in transmission connection with the first transmission wheel  710  and the second transmission wheel  730 , and the first transmission section  751  and the second transmission section  752  are arranged in an intersection manner between the first transmission wheel  710  and the second transmission wheel  730 . That is, opposite cutting relative to the conveying belt  500  is implemented through the transmission belt  750  arranged in an intersection manner, thereby achieving a better cutting effect. 
     It can be understood that the operation of the conveying belt  500  and the cutter head  760  can also be controlled by different driving sources, which is not limited in the present disclosure. 
     In this embodiment, the second transmission wheel  730  is provided with a rotation shaft  740  connected to the cutter head  760 , and the other end of the connection plate  720  is rotatably connected to the rotation shaft  740  through a bearing seat. The cutter head  760  includes a first limiting plate  761 , a first base plate  762 , a cutting knife  763 , a second base plate  764 , and a second limiting plate  765  sequentially arranged along an axial direction of the rotation shaft  740 . A diameter of the first limiting plate  761  and a diameter of the second limiting plate  765  are both larger than a diameter of the first base plate  762  and a diameter of the second base plate  764 , such that an outer edge of the first limiting plate  761 , an outer edge of the second limiting plate  765 , an outer edge of the first base plate  762 , and an outer edge of the second base plate  764  form an annular groove  766  for accommodating an object to be cut. in the cutting process, the shrimp enters the annular groove  766 , and the first base plate  762  and the second base plate  764  abut against the shrimp. The first base plate  762  and the second base plate  764  are detachably connected to the rotation shaft  740 , and a diameter of the cutting knife  763  is larger than the diameter of the first base plate  762  and the diameter of the second base plate  764 , such that a blade of the cutting knife  763  extends to the annular groove  766 . The protruding width of the blade of the cutting knife  763  relative to the annular groove  766  is a cutting knife depth of the shrimp, to implement fixed-depth cutting of the shrimp. Moreover, by replacing the first base plate  762  and the second base plate  764  of different specifications, the cutting knife depth of the cutter head  760  can be changed, and the application range is wider. 
     Furthermore, one end of the rotation shaft  740  is connected to the second transmission wheel  730 , a fixed element  767  is detachably arranged at the other end of the rotation shaft  740 , the first limiting plate  761  is fixedly arranged on the rotation shaft  740 , the second limiting plate  765  is detachably connected to the rotation shaft  740 , and the second limiting plate  765  abuts against the fixed element  767 . The mounting position of the second limiting plate  765  is adjusted through the fixed element  767 , such that the second limiting plate  765  is pressed against the first limiting plate  761  to clamp the first base plate  762  and the second base plate  764 , thereby quickly disassembling and mounting the cutter head  760 . The fixed element  767  is threadedly connected to the rotation shaft  740 , such that disassembly is facilitated, and stability is high. 
     Furthermore, the diameter of the cutting knife  763  is smaller than the diameter of the first limiting plate  761  and the diameter of the second limiting plate  765 , that is, the blade of the cutting knife  763  is surrounded inside the annular groove  766 , thereby achieving a protection effect, achieving higher safety, and preventing operators from accidentally injuring during working. In addition, the diameter of the first limiting plate  761  is equal to the diameter of the second limiting plate  765 , to achieve a limiting effect on the left and right sides of the shrimp. The diameter of the first base plate  762  is equal to the diameter of the second base plate  764 , to ensure that the back of the shrimp can abut against the first base plate  762  and the second base plate  764  at the same time, thereby better jacking up the cutter head  760 , and achieving an effect of freely floating up and down. 
     Furthermore, a first arc surface  768  recessed inwardly is provided on a side of the first base plate  762  close to the cutting knife  763 , and a second arc surface  769  recessed inwardly is provided on a side of the second base plate close to the cutting knife  763 , such that a longitudinal section of a shape formed by combining the first arc surface  768  and the second arc surface  769  is similarly semiarc-shaped, which is better fitted with the arc shape of the back of the shrimp, thereby improving the cutting stability and ensuring the cutting quality. 
     The shrimp peeling device according to this embodiment has the following working principle: the shrimp is placed on the conveying belt  500 ; when passing through the first pathway  610 , the shrimp is clamped and conveyed in the vertical state; when passing through the processing opening  620 , the shrimp jacks up the cutter head  760  for floating up and down, and the middle of the back of the shrimp is cut by the cutting knife  763 ; after cutting is completed, the shrimp is continuously carried to the shell removing frame  800  by the conveying belt  500 ; when passing through the narrowing cavity  812 , the shrimp is squeezed by the conveying belt  500 , and the shrimp meat is squeezed out by the belt and discharged from the discharge port  820  at the top to obtain the peeled back-opened shrimp; the shrimp meat falls into the shrimp meat collection bucket through the guide plate  880 ; the shrimp shell is clamped by the conveying belt  500  to pass through the narrowing cavity  812 ; and finally, along with unfolding of the conveying belt  500 , the shrimp shell falls off. 
     In conclusion, the shrimp peeling device provided in the above embodiment of the present disclosure has the following advantages: (1) the shrimp is conveyed vertically through cooperation between the conveying belt  500  and the first pathway  610 ; (2) the connection plate  720  can implement up-down floating of the cutter head  760 , which is not affected by the size difference of the shrimp in the cutting process, and the fixed-depth cutting can be implemented; (3) the cutting knife depth can be adjusted through the first base plate  762  and the second base plate  764  that can be replaced; (4) the narrowing cavity  812  can narrow the conveying belt  500  to squeeze the cut shrimp to obtain the peeled shrimp; and (5) it is not necessary to position the shrimp in the entire process, the structure is simple, the production cost is low, and the production efficiency can be greatly improved. 
     The above are only preferred implementations of the present disclosure. It should be noted that several improvements and replacements may further be made by a person of ordinary skill in the art without departing from the principle of the present disclosure, and such improvements and replacements should also be deemed as falling within the protection scope of the present disclosure.