Abstract:
The present invention discloses an automatic resetting steel wire rope brake, which comprises two side plates, a fixed brake plate, a moving brake plate, two sides of the moving brake plate are respectively and rotatably matched with one end of a link arm, and the moving brake plate can do translational motion towards or away from the fixed brake plate under the drive of the two link arms; two ends of the sliding axle are respectively in sliding fit with arc-shaped grooves of the two side plates; a hooking part is formed on a swing-type latch hook, and is used for hooking and locking the sliding axle. According to the automatic resetting steel wire rope brake disclosed by the present invention, elevator ascending and descending over-speed protection and car accidental movement protection can be realized simultaneously.

Description:
TECHNICAL FIELD 
       [0001]    The present invention pertains to the field of mechanical manufacturing technologies, relates to an elevator safety brake apparatus, and more particularly, to an automatic resetting steel wire rope brake. 
       BACKGROUND 
       [0002]    At present, a steel wire rope brake used in an elevator is mainly used as an elevator safety device of up-direction over speeding. It is adopted a mode of power-on triggering action at failure and manual mechanical resetting. There are objections between its control principle and the current standard requirements, meanwhile it is unable to meet relevant requirements for car accidental movement protection device in term of triggering control mode. Besides, in terms of resetting mode, implementation of resetting by means of manual operation is unable to meet a user&#39;s normal use requirements. In addition, the friction brake lining is small in friction coefficient, quick-wearing and short in life, and thus is also unable to meet the requirements for brake life in car accidental movement. For this purpose, an improved design is required for the existing steel wire rope brake to make it more in line with standards, perfect in function, optimized in performance and more stable in control. 
         [0003]    By means of information retrieval of the prior art, it is found that the existing steel wire rope brake is designed based on the upgoing overspeed protection, dominated by a mechanical manual resetting mode. It is extremely inconvenient for resetting for limited operation space, higher storey and brake of an elevator without machine room. In addition, during a power-on triggering, intermediate control mechanisms are increased, control delay is long, larger electric current is required for the electromagnet, and a back-up power supply is large in capacity and high in power consumption. Therefore, the control principle, braking force and brake lining life are not suitable for car accidental movement protection. An improved design is required for the resetting mode, the triggering mode, the braking force, the control principle and so on so as to meanwhile meet the upgoing overspeed protection function and car accidental movement protection function. 
       SUMMARY 
       [0004]    In order to overcome deficiencies of the prior art, the present invention provide an automatic resetting steel wire rope brake, by which, elevator ascending and descending over-speed protection and car accidental movement (freewheeling with a car door open) protection can be realized simultaneously. 
         [0005]    The present invention is implemented through following technical solution: an automatic resetting steel wire rope brake, wherein comprising: two side plates, a fixed brake plate, a moving brake plate, a motor lead screw and push block resetting mechanism, an electromagnet resetting mechanism and an electromagnetic triggering mechanism, the fixed brake plate and the moving brake plate are arranged in parallel, and an interval is kept between opposite clamping surfaces of the fixed brake plate and the moving brake plate; two sides of the moving brake plate are respectively and rotatably matched with one end of a link arm, and the moving brake plate can do translational motion towards or away from the fixed brake plate under a drive of the two link arms; the other end of each of the two link arms is rotatably matched with one end of a sliding axle; two ends of the sliding axle are respectively in sliding fit with arc-shaped grooves of the two side plates; a swing-type latch hook is provided, and the latch hook forms a hooking part used for hooking and locking a sliding axle; a swing end of the latch hook is triggered by an electromagnetic or mechanical triggering mechanism to enable the swing end to release the sliding axle; the motor lead screw and push block resetting mechanism promoted by the electromagnet resetting mechanism reset the electromagnetic triggering mechanism, the latch hook, the sliding axle and the moving brake plate. 
         [0006]    Preferably, the motor lead screw and push block resetting mechanism includes a push block, a screw, a lead screw and a motor, the motor drives an upper end of lead screw, a lower end of the lead screw is rotatably connected with the screw and movably penetrate through the push block, the screw is fixed on an upper surface of the push block, and a bottom inclined surface of the push block directly faces and props against the sliding axle. 
         [0007]    Preferably, the sliding axle transversely penetrates through an upper spring seat; between the two side plates there is provided a spring support shaft on which a lower spring seat is mounted, the upper spring seat is corresponding to the lower spring seat in upper and lower positions, and an energy storage spring is provided between the upper spring seat and the lower spring seat. 
         [0008]    Preferably, the electromagnetic triggering mechanism includes an electromagnet, an impact bar, a nut and a buffer cushion, where the impact bar longitudinally penetrates through an iron core of the electromagnet, the iron core of the electromagnet is linked with the impact bar, a part of the impact bar is externally sleeved with a compression spring, an upper end of the impact bar is provided with the buffer cushion and is screwed with the nut, the buffer cushion directly faces an upper surface of an external housing of the electromagnet; and a lower end of the impact bar is provided with the buffer cushion and an impact screwhead which directly faces and downward props against the swing end of the latch hook. 
         [0009]    Preferably, the push block is fixedly connected with a slide block, a guide rail longitudinally penetrates through the slide block and is in sliding fit with the slide block; the electromagnet resetting mechanism includes a pin shaft, a support rod, a tension spring, a spring guide holder and a support on which the support rod that can rotate is mounted, an external end of the support rod forms a pin hole, the pin shaft transversely penetrates through the pin hole of the support rod, one end of the pin shaft is connected to one end of the tension spring, the other end of the tension spring is connected to the swing end of the latch hook; the pin shaft is also connected to the spring guide holder which is connected to a lower end of the impact bar; and an inner end of the support rod directly faces a lower surface of the slide block, and when the slide block moves downward, the lower surface of the slide block props against the inner end of the support rod to make the support rod swing. 
         [0010]    Preferably, the fixed brake plate is fixedly provided with a latch hook rack which rotatably assembles the latch hook through the pin shaft. 
         [0011]    Preferably, the moving brake plate is fixedly connected to two fixed axle plates, a link arm shaft is assembled between the two fixed axle plates, and two ends of the link arm shaft are respectively and rotatably matched with one end of the two link arms. 
         [0012]    Preferably, the two side plates are respectively and rotatably matched with one mounting plate by means of a pivot screw, after adjusting a mounting angle, the two side plates are fixedly connected with the mounting plate; and the mounting plate is fixed to a cross beam of an elevator car. 
         [0013]    Preferably, an outer side surface of the moving brake plate is provided with two fixed axle plates, a link arm shaft penetrates through the two fixed axle plates and is fixedly connected by means of a fixed pin; the moving brake plate is also provided with a support pin which faces an outside of the moving brake plate and is positioned below the link arm shaft to prevent the link arm shaft from sliding down in a brake process. 
         [0014]    Preferably, a safety switch is provided, when the impact bar of the electromagnet impacts the latch hook, the latch hook moves down to turn on the safety switch, and is connected to an elevator safety circuit by means of the safety switch. 
         [0015]    Preferably, a rear side plate is provided with the safety switch. 
         [0016]    Preferably, the electromagnet is mounted on an electromagnet seat, the electromagnet seat is mounted on a fixed plate which is mounted on the rear side plate, and the rear side plate is mounted on a rear side surface of the steel wire rope brake. 
         [0017]    Preferably, the fixed brake plate is mounted on a left side plate and a right side plate. 
         [0018]    Preferably, each of the two side plates is provided with a pin, correspondingly, pin holes are formed on the fixed brake plate, and the pins are corresponding to and fixedly connected with the pin holes on the fixed brake plate; a plurality of fixed plate connecting holes are respectively formed at a front side edge of each of the two side plates, the front side edges of the two side plates fit with the fixed brake plate, and bolts penetrate through the fixed brake plate and then are screwed into the fixed plate connecting holes. 
         [0019]    Preferably, an adjusting shim is provided between the fixed axle plate and the moving brake plate. 
         [0020]    Preferably, the fixed brake plate is connected with the moving brake plate through a guiding shaft. 
         [0021]    Preferably, the motor drives the lead screw through a gear reducer, and a transmission shaft of the gear reducer is connected to an upper end of the lead screw by means of a coupled axle-sleeve. 
         [0022]    Preferably, a brake lining is respectively assembled on the clamping surface of the fixed brake plate and of the moving brake plate, the brake lining protrudes above the clamping surface of the fixed brake plate and of the moving brake plate, and the two brake linings form longitudinal arc-shaped grooves fitting with an external shape of the steel wire rope. 
         [0023]    Preferably, the fixed brake plate and the moving brake plate form, toward an opposite side surface, two cuboid-shaped recessed parts respectively extending to an upper edge and a lower edge of the fixed brake plate and the moving brake plate, two side edges of each of the recessed parts are brake plate table facets, and a same side of each of the recessed parts is provided with a brake lining adjusting hole; correspondingly, the brake lining forms the recessed part whose edge is a brake lining table facet fitting with the brake plate table facets, the brake lining is embedded between the two recessed parts of the fixed brake plate and the moving brake plate, and the table facets both come into contact, a width of the table facet at two sides fits with that of the brake lining, and both are fixed by screwing bolts into the brake lining adjusting holes. 
         [0024]    Preferably, the brake linings are formed by selecting and vertically and parallelly arranging multiple brake linings, and each of the brake linings is fixedly connected with the fixed brake plate and the moving brake plate through bolts. 
         [0025]    Preferably, the brake lining adjusting hole is an elongated hole. 
         [0026]    In the present invention, the performance of the steel wire rope brake is improved by means of upgrading of function, and its advantages reside in that elevator ascending and descending over-speed protection and car accidental movement protection functions are integrated, and two safety protection problems can be solved by using one device. The original power-on action is changed to a power-loss action. In this way, it is solved the problem that after an external power supply is lost, the protective device is still in a working state, and the car is maintained in a stop position; the power-loss triggering mechanism reduces intermediate control links, makes two electromagnets simultaneously act on the latch hook, reduces time delay, improves the control reliability, and implements automatic resetting of the electromagnet and the triggering mechanism. The resetting modes of the triggering mechanism and the energy storage spring are changed to automatic resetting, thereby solving the problem that the triggering mechanism and the energy storage spring are mounted somewhere inaccessible without remote resetting function and thus it is unable to meet standards. In addition, by means of structural improvement of the brake friction lining and moving (fixed) brake plate, the present invention also makes it convenient for installation and maintenance, and stable and controllable in manufacturing; meanwhile, the improvement of the friction lining improves the stability of the brake friction lining, and makes the brake perfect in function, optimized in performance and more stable in control. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0027]      FIG. 1  is a schematic diagram of an appearance structure of a steel wire rope brake according to the present invention; 
           [0028]      FIG. 2  is a structural isometric (partial) view of the steel wire rope brake according to the present invention; 
           [0029]      FIG. 3  is a structural lateral (partial) view of the steel wire rope brake according to the present invention; 
           [0030]      FIG. 4  is a structural rear (partial) view of the steel wire rope brake according to the present invention; 
           [0031]      FIG. 5  is a structural diagram of a latch hook according to the present invention; 
           [0032]      FIG. 6  is a structural assembly diagram of a brake plate and a brake lining according to the present invention; 
           [0033]      FIG. 7 a    and  FIG. 7 b    are a principal view and a vertical view of a brake lining according to the present invention; 
           [0034]      FIG. 7 c    and  FIG. 7 d    are a principal view and a vertical view of another brake lining according to the present invention; 
           [0035]      FIG. 7 e    is a side view of a brake lining according to the present invention; 
           [0036]      FIG. 8  is a tridimensional structural diagram of a motor resetting mechanism according to the present invention; 
           [0037]      FIG. 9  is a tridimensional structural diagram of an electromagnetic triggering mechanism according to the present invention; 
           [0038]      FIG. 10  is an installation drawing of a brake body according to the present invention; and 
           [0039]      FIG. 11  is a structural diagram of an impact bar according to the present invention. 
       
    
    
       [0040]    In FIGs.,  1  fixed nut,  2  buffer cushion,  3  impact bar,  4  electromagnet,  5  electromagnet seat,  6  fixed plate,  7  pin shaft,  8  support rod,  9  tension spring,  10  spring guide holder,  11  support,  12  safety switch,  13  rear side plate,  14  fixed pin,  15  adjusting screw,  16  mounting plate,  17  energy storage spring,  18  sliding axle,  19  spring seat,  20  brake lining adjusting hole,  21  link arm,  22  moving brake plate,  221  moving brake plate table facet,  23  guiding shaft,  24  fixed brake plate,  25  steel wire rope,  26  side plate,  27  guide rail,  28  slide block,  29  latch hook,  30  latch hook rack,  31  fixed axle plate,  32  link arm shaft,  33  push block,  34  screw,  35  brake lining,  351  brake lining table facet,  36  lead screw,  37  motor,  38  coupled axle-sleeve,  39  motor mounting plate,  40  gear reducer, and  41  top plate; 
         [0041]      4 - 1  compression spring,  4 - 2  iron core,  4 - 3  external housing of the electromagnet,  4 - 4  buffer cushion,  4 - 5  impact screwhead;  311  fixed pin,  312  fastening screw,  313  support pin,  314  adjusting shim,  161  pivot screw,  191  spring seat,  192  spring support shaft,  291  latch hook impact plane,  292  safety switch impact plane,  293  latch hook straight slope,  294  latch hook mounting hole,  295  latch hook arc surface,  296  hook trough,  221  brake plate table facet,  222  brake port,  261  fixed plate connecting hole,  262  open arc,  263  pin,  264  deflection locking threaded hole,  265  spring seat axle hole, and  266  deflection axle hole. 
       DETAILED DESCRIPTION OF THE EMBODIMENTS 
       [0042]    The following describes in detail preferred embodiments of the present invention with reference to the accompanying drawings. 
         [0043]    As shown in  FIG. 1-11 , this embodiment includes a motor lead screw and push block resetting mechanism, an electromagnet resetting mechanism, friction moving/fixed brake lining plate mechanisms, an electromagnetic triggering mechanism and so on, and a connection relationship thereof is as below: the motor lead screw and push block resetting mechanism is mounted between an upper top plate and the latch hook rack, the electromagnet resetting mechanism is connected to the motor lead screw and push block resetting mechanism, the friction moving/fixed brake lining plate mechanisms are mounted on the moving/fixed brake plates, and the electromagnetic triggering mechanism is mounted on the rear side plate. A specific structure is as below: 
         [0044]    The top plate  41  is mounted on an upper part of the steel wire rope brake, two side plates  26  are respectively mounted on the mounting plate  16  at two sides of the steel wire rope brake, the mounting plate  16  is fixedly mounted on a cross beam through bottom mounting holes, and the rear side plate  13  is mounted on the rear side surface (one side opposite to the steel wire rope) of the steel wire rope brake, thereby constituting a frame of the steel wire rope brake. 
         [0045]    A mounting base includes the mounting plate  16 , the adjusting screw  15 , the fixed pin  14  and so on. After the mounting plate  16  is vertically mounted on the cross beam of an elevator car, the mounting plate  16  is connected into the deflection axle hole  266  of the side plate  26  through the pivot screw  161  on its side, so that the side plate  26  may rotate around the pivot screw  161 . After the side plate  26  rotates at an angle of 0-45 degrees, the side plate  26  is locked by connecting the adjusting screw  15  to the deflection locking threaded hole  264  of the side plate  26 , then a hole is drilled on the side plate  26  through the pin hole by using an electric drill, then the fixed pin  14  is inserted into the hole, or the mounting plate  16  is welded onto the side plate  26  to prevent the side plate  26  from rotating around the pivot screw  161  in a brake process. In the above connection structure, the adjustment of an angle between the brake plates and the steel wire is achieved by adjusting the mounting angle of the side plate  26 , after being adjusted in place, the side plate  26  is fixed. 
         [0046]    The motor lead screw and push block resetting mechanism includes the pin shaft  7 , the support rod  8 , the tension spring  9 , the spring guide holder  10 , the support  11 , the energy storage spring  17 , the sliding axle  18 , the spring seat  19 , the guide rail  27 , the slide block  28 , the latch hook  29 , the latch hook rack  30 , the push block  33 , the screw  34 , the lead screw  36 , the motor  37 , the coupled axle-sleeve  38 , the motor mounting plate  39 , the gear reducer  40  and so on. The motor mounting plate  39  is mounted on the top plate  41 , the gear reducer  40  is mounted on the motor mounting plate  39 , the gear reducer  40  is driven by the motor  37  to run, and the external housing of the motor  37  is fixed to the motor mounting plate  39 . The transmission shaft of the gear reducer  40  is linked with the upper end of the lead screw  36  by connecting with the coupled axle-sleeve  38 , the other end of the lead screw  36  forms an external thread and is screwed with the screw  34 , and after this end of the lead screw  36  movably penetrates through the push block  33 , the lead screw  36  is rotatably positioned on the latch hook rack  30 . The screw  34  is fixedly mounted on the upper surface of the push block  33 , the lead screw  36  is driven by the motor  37  to rotate, and pushes the screw  34  to move through the external thread, and then enables the push block  33  to move. 
         [0047]    The push block  33  is fixedly connected with the slide block  28 , the guide rail  27  longitudinally penetrates through the slide block  28  and is in sliding fit with the slide block  28 . The guide rail  27  is mounted on the rear side plate  13  to form guiding and bearing. While the screw  34  moves, it drives the slide block  28  to move on the guide rail  27 . 
         [0048]    The bottom end of the push block  33  forms an inclined plane which directly faces the sliding axle  18  which transversally penetrates through two spring seats  19 , and two ends of the sliding axle  18  are respectively placed into an open arc groove  262  formed by the two side plates in a sliding way. 
         [0049]    The energy storage mechanism includes the spring  17 , two spring seats  191  and the spring support shaft  192 , between the left and the right side plates  26  there is mounted the spring support shaft  192 , two ends of the spring support shaft  192  are respectively mounted in the spring seat axle hole  265  of the two side plates, the two spring seats  191  are mounted on the spring support shaft  192 , two spring seats  191  are corresponding to two spring seats  19  on the upper part, and between the corresponding spring seats  19  and  191  there is respectively provided with one energy storage spring  17 . 
         [0050]    The fixed brake plate  24  is mounted on the two left and right side plates  26 , and the connection structure is as below: each of the two side plates  26  is provided with a pin  263 , correspondingly, pin holes are formed on the fixed brake plate  24 , first, pin holes on the fixed brake plate  24  are positioned through the pin  263 , then are connected through the fixed plate connecting holes  261 . A plurality of fixed plate connecting holes  261  are respectively formed at a front side edge of each of the two side plates  26 , the front side edges of the two side plates  26  fit with the fixed brake plate  24 , and the side plates  26  are connected to the fixed brake plate  24  by screws, namely, bolts penetrate through the fixed brake plate  24  and then are screwed into the fixed plate connecting holes  261 . The latch hook rack  30  is fixedly mounted on an inner side surface of the fixed brake plate  24 , the latch hook rack  30  rotatably assembles the latch hook  29  through the pin shaft. The latch hook  29  forms the hook trough  296  corresponding to an external wall of the sliding axle  18 , which can hook or release the sliding axle  18 . The other end (outside end) of the latch hook  29  movably stretches out of the rear side plate  13 , and this end directly faces the lower end of the impact bar  3 . 
         [0051]    The motor  37  starts to run after power is supplied, power is transmitted to the lead screw  36  through an output shaft of the gear reducer  40 , then makes screw  34  move on the lead screw  36  to drive the push block  33  to move, the sliding axle  18  is compressed through the inclined surface of the push block  33 , the sliding axle  18  implements compression of the energy storage spring  17  by means of the spring seat  19 ; after the energy storage spring is in place, the latch hook hooks the sliding axle, and the motor reverses to the initial state, thereby implementing the automatic resetting of the steel wire rope brake. 
         [0052]    Assembly structures of the pin shaft  7 , the support rod  8 , the tension spring  9 , the spring guide holder  10  and the supports  11  or the like are seen below. 
         [0053]    The electromagnet resetting mechanism includes the pin shaft  7 , the support rod  8 , the tension spring  9 , the spring guide holder  10  and the supports  11 . A pair of supports  11  are mounted on the rear side plate  13 , one support rod  8  that can rotate is mounted on the each support  11 , the other end of (outside end) of the support rod  8  forms a pin hole, the pin shaft  7  transversely penetrates through the pin holes of the two support rods  8 , one end of the pin shaft  7  positioned outside of one support rod  8  is connected to one end of the tension spring  9 , the other end of the tension spring  9  is connected to the outside end of the latch hook  29  to implement resetting of the latch hook  29 . One section of the pin shaft  7  positioned between the two support rods  8  is connected to the spring guide holder  10  which is connected to the lower end of the impact bar  3 , and a part of the impact bar  3  is externally sleeved with the compression spring. Two holes are formed on the rear side plate  13 , each hole is used for movably up and down penetrating through the inside end of one support rod  8 , and the inside end of the support rod  8  bulges upward and directly faces the lower surface of the slide block  28 . When the slide block  28  moves downward, the lower surface of the slide block  28  props against the inside end of the support rod  8  to make the support rod  8  swing, so that the spring guide holder  10  is linked by means of the action of the support rod  8 , drives the impact bar  3  to move upward to compress the spring on the impact bar of the electromagnet. After the spring is compressed, an external power source supplies power to the electromagnet, and spring force is maintained by means of electromagnetic force to implement resetting of the power-losing electromagnet. 
         [0054]    In the process of rotation of the motor, the push block connected with the screw moves to a preset position and comes into contact with the inside end of the support rod; when the push block moves to the preset position, the support rod is pushed to rotate to drive the spring guide holder to move. Compression of the spring on the impact bar of the electromagnet is implemented by driving the impact bar to move by the spring guide holder mounted on the impact bar. After compression of the spring is in place, the tension spring pulls the outside end of the latch hook until the sliding axle is locked, at the moment, the motor reverses, and the support restores its initial state due to loss of overhead pressure. In this way, it is implemented the automatic resetting of the power-losing electromagnet. 
         [0055]    The friction moving/fixed brake plate mechanism includes the guiding shaft  23 , the fixed brake plate  24 , the moving brake plate  22  and the brake lining  35 , where the fixed brake plate  24  and the moving brake plate  22  are longitudinally arranged in parallel, opposite surfaces of both are provided with the brake lining  35 , and the moving brake plate  22  is the same as the brake lining  35  in assembly structure. The following describes in detail the assembly structure of the moving brake plate  22  and the brake lining  35 : one side face of the moving brake plate  22  (toward the fixed brake plate  24 ) forms two cuboid-shaped recessed parts respectively extending to an upper edge and a lower edge of the moving brake plate  22 , two side edges of each of the recessed parts are brake plate table facets  221 , and the same side of each of the two recessed parts is provided with a brake lining adjusting hole  20  (an elongated hole is selected in this embodiment so that multiple bolts can be screwed); correspondingly, the brake lining  35  forms the recessed part whose edge is a brake lining table facet  351  fitting with the brake plate table facets  221 , the brake lining  35  is embedded between the two recessed parts of the moving brake plate  22 , and the table facets both come into contact, a width of the table facets  221  at two sides fits with that of the brake lining  35 , and both are fixed by screwing bolts into the brake lining adjusting holes  20 . The brake surface of the brake lining  35  forms a longitudinal arc-shaped groove fitting with an external shape of the steel wire rope, and protrudes out of the side surface of the moving brake plate  22 . The brake lining  35  on the two brake plates  22  and  24  forms longitudinal arc-shaped grooves corresponding to the steel wire ropes in number, the steel wire rope  25  penetrate the corresponding longitudinal arc-shaped groove, and in a normal state, a clearance is kept between the longitudinal arc-shaped groove and the steel wire rope  25 . 
         [0056]    The above involve the case where one brake lining is used, where the number of the arc-shaped grooves may be combined to use according to needs so as to meet requirements for different numbers of the arc-shaped grooves. As a preferred technical solution of the present invention, multiple brake linings are selected and combined. As shown in  FIGS. 7 a , 7 b , 7 c , 7 d  and 7 e   , the first brake lining has two arc-shaped grooves, and the second brake lining has three arc-shaped grooves, and five arc-shaped grooves are formed by combination of both, which fits with five steel wires. The brake linings are mutually matched and fixed through stepped surfaces. The brake linings are combined to fit with different numbers of steel wire ropes without replacing brake plates. 
         [0057]    Two fixed axle plates  31  are mounted the outer side surface of the moving brake plate  22  through the fastening screw  312 , and the adjusting shim  314  is provided between the fixed axle plate  31  and the moving brake plate  22 . The link arm shaft  32  penetrates through the two fixed axle plates  31  and is fixed by means of the fixed pin  311  to prevent it from rotating. The moving brake plate  22  is also provided with two support pins  313  which face an outside of the moving brake plate  22  and are positioned below the link arm shaft  32  to prevent the link arm shaft  32  from sliding down in a brake process by means of the supporting action of the support pins  313 . The adjusting shim  314  is mounted between the fixed axle plate  31  and the moving brake plate  22  to adjust the height of the sliding axle  18 . It is implemented different magnification ratios and spring forces by adjusting the height of the sliding axle  18  to meet requirements for quality of different braking systems. 
         [0058]    The guiding shaft  23  is connected to the fixed brake plate  24  and the moving brake plate  22 . Each of four corners of the moving brake plate  22  is provided with a hole  222 , correspondingly, each of four corners of the fixed brake plate  24  is also provided with a hole, a corresponding hole is connected with the guiding shaft  23 , the guiding shaft  23  is fixedly connected with the moving brake plate  22  and is in sliding fit with the fixed brake plate  24 , or vice versa, namely, the guiding shaft  23  is in sliding fit with the moving brake plate  22  and is fixedly connected with the fixed brake plate  24 . 
         [0059]    The outer side surface of the moving brake plate  22  is fixedly connected with the fixed axle plate  31  which is provided with the link arm shaft  32 , two ends of the link arm shaft  32  stretches out of the fixed axle plate  31 , and end parts thereof are respectively and rotatably matched with one end of the link arm  21 . The other end of the link arm  21  is rotatably matched with the sliding axle  18 . 
         [0060]    The electromagnetic triggering mechanism includes the electromagnet  4 , the impact bar  3 , the fixed nut  1 , the buffer cushion  2 , the electromagnet seat  5  and the fixed plate  6 , where the fixed plate  6  is mounted on the rear side plate  13 , the electromagnet seat  5  is mounted on the fixed plate  6  through bolts, and the electromagnet  4  is mounted on the electromagnet seat  5 . The iron core of the electromagnet  4  is linked with the impact bar  3  which moves together with the iron core, and a part of the impact bar  3  is externally sleeved with the compression spring ( FIG. 3 ). The spring  4 - 1  is externally sleeved on a part of the impact bar  3  which longitudinally penetrates through the iron core  4 - 2  of the electromagnet, the upper end of the impact bar is provided with the buffer cushion  2  and then is fixed by means of the fixed nut  1  to prevent the impact bar  3  from falling off during impact; and the lower end of the impact bar is provided with the buffer cushion  4 - 4  and then is fixed through the impact screwhead  4 - 5  to prevent an impact in an ascending resetting process. 
         [0061]    The latch hook  29  forms a latch hook impact plane  291 , a safety switch impact plane  292 , a latch hook straight slope  293 , a latch hook mounting hole  294 , a latch hook arc surface  295  and a hook trough  296 . The latch hook is mounted on the latch hook rack  30  through the latch hook mounting hole  294 . When the impact bar  3  impacts the latch hook impact plane  291 , the latch hook  29  rotates around the latch hook rack  30  to make the straight slope  293  slide so that the hook trough  296  releases the locking of the sliding axle  18 , and at the moment, the safety switch impact plane  292  of the latch hook that is moving downward triggers the safety switch  12 . During resetting, the latch hook moves upward, the latch hook arc surface  295  comes in contact with the sliding axle  18  so that the hook trough  296  locks the sliding axle  18 ; when the motor  37  returns back, the sliding axle  18  moves upward under the action of the energy storage spring  17  so that the latch hook arc surface  295  comes in contact with the sliding axle  18 , and at the moment, the latch hook is unable to rotate, thereby locking the sliding axle  18 . 
         [0062]    When the electromagnet  4  loses power, the electromagnet  4  loses electromagnetic force, driven by the compression spring, the impact bar  3  conducts a downward impact movement and produces an impact effect by means of spring force and self weight, so that the latch hook  29  trips off and releases the compressed energy storage spring  17 . 
         [0063]    The safety switch  12  is mounted on the rear side plate  13 , when the impact bar  3  of the electromagnet impacts the latch hook  29 , the latch hook  29  moves downward to turn on the safety switch  12 . Control of the whole elevator is implemented by the safety switch  12  being connected to an elevator safety circuit. The safety switch impact plane  292  touches a contact of the safety switch  12  which is connected to a safety circuit of an elevator control system, and the system stops working once the safety circuit is disconnected. 
         [0064]    Reference is made to Brake For Traction Cable Of Elevator (Patent Number: ZL200510061286.5) regarding other contents of the steel wire rope brake of the present invention, which is not detailed herein. 
         [0065]    The automatic resetting steel wire rope brake of the present invention includes: a motor lead screw and push block resetting mechanism, friction moving/fixed brake lining plate mechanisms, an electromagnetic triggering mechanism, an electromagnet automatic resetting mechanism and so on. The automatic resetting steel wire rope brake is a safety protection device that updates the function of the original safety device of up-direction over speeding to implement combination of upward overspeed protection and car accidental movement protection. It is improved from electric triggering to power-loss triggering, and elevator upward overspeed protection and car accidental movement protection are achieved by using the motor lead screw and push block resetting mechanism, the friction moving/fixed brake lining plate mechanisms, the electromagnet automatic resetting mechanism and a controller. In case of upward overspeed or car accidental movement, by means of logical relation operation of the controller, a control signal is outputted to make the electromagnet of the electromagnetic triggering mechanism lose power to trigger the latch hook of the steel wire rope brake to act. During resetting, the motor of the motor lead screw and push block resetting mechanism is energized, the sliding axle, a linkage mechanism and the electromagnet resetting mechanism are compressed by the push block to implement automatic resetting of the energy storage spring, the latch hook and the electromagnet. The automatic resetting steel wire rope brake in the present invention is perfect in function, quick in response, stable and controllable, convenient for installation, and low in manufacturing cost, etc. 
         [0066]    The above describes in details preferred embodiments of the present invention, however, to those of ordinary skill in the art, the embodiments may be changed in according with the thought provided by the present invention, and these changes shall also be regarded as the scope of protection of the present invention.