Hardware mold machining fixing device

Abstract

The invention relates to the technical field of mold production, in particular to a hardware mold machining fixing device which comprises a restraining front end, a restraining middle piece and a restraining rear end. The suppression front end is connected with the suppression rear end through the suppression middle piece; when the restraining middle part is fixed by the restraining rear end, the restraining front end is locked synchronously, and the restraining front end is matched with a bolt for fixing a mold and restrains the bolt from rotating and loosening in a locked state; and the suppression rear end is connected to the workbench. By arranging the restraining front end, the restraining middle piece and the restraining rear end, when the restraining middle piece is fixed at the restraining rear end, locking of the restraining front end is synchronously completed, the restraining front end restrains rotation and loosening of a bolt in the locked state, and therefore rotation of a nut in the vibration process of repeated punching of a die is avoided, the loosening problem of the nut is restrained, and the machining efficiency is improved. And the problem that the die is loosened in the machining process is solved.

Description

Technical Field

[0001] The invention relates to the technical field of mold production, and in particular to a hardware mold processing and fixing device. Background Art

[0002] Stamping is a forming method that relies on a press and a die to apply external force to plates, strips, tubes, and profiles to cause them to undergo plastic deformation or separation, thereby obtaining a workpiece of the desired shape and size.

[0003] Among them, the mold is an indispensable part of the stamping process. The hydraulic rod drives the stamping head to move up and down, and the stamping head stamps the hardware to complete the processing of the workpiece.

[0004] However, in practice, it is found that as the stamping process progresses, the mold will become loose. Once the looseness reaches a certain extent, the mold will be misaligned during the stamping process, which will cause excessive wear, not only causing the workpiece to be scrapped, but also causing damage to the mold.

[0005] The main reason is that the main way to fix the metal mold during processing is to use bolts to connect the template to the workbench, and the impact received by the hardware mold during work will be fed back to the nut, causing the nut to rotate continuously and become loose.

[0006] In order to solve the above-mentioned mold loosening problem, a hardware mold processing fixing device is designed. Summary of the invention

[0007] The present invention aims at the deficiencies in the prior art and provides the following technical solutions:

[0008] A hardware mold processing fixing device, comprising: a restraining front end, a restraining middle piece, and a restraining rear end;

[0009] The suppression front end is connected to the suppression back end via the suppression middleware;

[0010] When the suppression rear end fixes the suppression middle piece, the suppression front end is locked synchronously, and the suppression front end is adapted to the bolts of the fixed mold, and the rotation loosening of the bolts is suppressed in the locked state;

[0011] The restrained rear end is connected with the workbench.

[0012] As an improvement of the above technical solution, a mold is placed on the workbench, and a plurality of limiting sliding grooves with T-shaped cross sections are provided on the surface in contact with the mold;

[0013] The bolt comprises a screw rod and a nut, the screw rod is a T-shaped structure, and the corresponding end portion is slidably matched with the limiting sliding groove;

[0014] The bottom of the restraining rear end is slidably matched with the limiting sliding groove.

[0015] As an improvement of the above technical solution, the suppression front end at least includes: an adjustable limiting sleeve and a fixed locking sleeve;

[0016] The lower inner part of the adjustable limit sleeve has a first hole matched with the nut, and the upper inner part of the adjustable limit sleeve has a second hole matched with the top end corresponding to the screw rod;

[0017] The top end of the adjustable limiting sleeve and the bottom end of the fixed locking sleeve are rotatably connected through a buckle structure, and the top surface of the adjustable limiting sleeve and the corresponding surface of the fixed locking sleeve are both provided with tooth structures that cooperate with each other;

[0018] A return spring is provided inside the fixed locking sleeve, the top end of the return spring cooperates with the inner top wall of the fixed locking sleeve, and the bottom end cooperates with the inner top surface of the adjustable limit sleeve;

[0019] In a normal state, the reset spring is in a compressed state, and the tooth structure on the adjustable limiting sleeve is not engaged with the tooth structure on the fixed locking sleeve.

[0020] As an improvement of the above technical solution, one tooth surface on the tooth structure is an inclined surface, and another adjacent tooth surface is a vertical surface perpendicular to the top surface of the adjustable limiting sleeve;

[0021] When the nut rotates in the loosening direction, the tooth structure on the adjustable limiting sleeve meshes with the tooth structure on the fixed locking sleeve, and the meshing tooth surfaces are all vertical surfaces.

[0022] As an improvement of the above technical solution, the fixed locking sleeves are all connected to the corresponding suppression middle piece;

[0023] When the number of the fixed locking sleeves is two, the fixed locking sleeves are located at two ends of the suppression middle piece, and the suppression middle piece is provided with a through hole that matches the suppression rear end.

[0024] As an improvement of the above technical solution, the suppression rear end includes at least: a pressure cap, a support seat assembly, and a limiting slider. The pressure cap is located at the top of the support seat assembly and movably cooperates with the support seat assembly. The limiting slider is located at the bottom of the support seat assembly and slidably cooperates with the limiting slide groove.

[0025] As an improvement of the above technical solution, the pressure cap is a T-shaped structure, the bottom end of which passes through the through hole and extends into the interior of the support seat assembly, and the support seat assembly has a fixing assembly for locking or loosening the pressure cap;

[0026] When the pressing cap is locked by the fixing assembly, the tooth structure on the adjustable limiting sleeve is meshed with the tooth structure on the fixed locking sleeve.

[0027] As an improvement of the above technical solution, the fixing assembly at least includes: a ratchet mechanism, a locking rod, a backstop rack, and a backstop rod;

[0028] The support seat assembly has a cavity inside, and a notch connected to the cavity is provided on the side wall of the support seat assembly, one end of the locking rod passes through the notch and extends into the cavity, the end of the locking rod extending into the cavity is connected to the ratchet mechanism, and the ratchet mechanism is engaged with the rod body portion of the pressure cap extending into the cavity;

[0029] The backstop rack is located at one side of the ratchet mechanism and is meshed with the ratchet mechanism in a normal state. One end of the backstop rack is connected to a backstop rod extending into the cavity.

[0030] As an improvement of the above technical solution, the ratchet mechanism and the locking rod are connected to the inner wall of the cavity through a fixed rotating shaft, and the back-stop rod is connected to the inner wall of the cavity through a reset rotating shaft;

[0031] After the back-stop rod is rotated by a certain angle, the back-stop rack is separated from the ratchet mechanism.

[0032] Beneficial effects of the present invention:

[0033] This solution sets a suppression front end, a suppression middle piece, and a suppression rear end. When the suppression rear end fixes the suppression middle piece, the suppression front end is locked synchronously, and the suppression front end is suppressed from rotating and loosening the bolts in the locked state, thereby preventing the nut from rotating during the vibration of repeated stamping of the mold, thereby suppressing the loosening of the nut and avoiding the problem of loosening of the mold during processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic diagram of the overall assembly structure of a hardware mold processing fixture;

[0035] Figure 2 It is a top view of the overall assembly structure of a hardware mold processing fixture;

[0036] Figure 3 for Figure 2 Sectional view at AA in the middle;

[0037] Figure 4 for Figure 3 The local enlarged structure diagram of B in the middle;

[0038] Figure 5 It is a top view of an adjustable limit sleeve in a hardware mold processing fixture;

[0039] Figure 6 for Figure 2 Sectional view at CC;

[0040] Figure 7 for Figure 6 A partial enlarged view of point D in the middle.

[0041] : 100, suppression front end; 110, adjustable limit sleeve; 111, channel one; 112, channel two; 113, tooth structure; 120, fixed locking sleeve; 121, reset spring; 200, suppression middle piece; 210, through hole; 300, suppression rear end; 310, pressure cap; 320, support seat assembly; 321, cavity; 322, notch; 330, limit slider; 340, fixed assembly; 341, ratchet mechanism; 342, locking rod; 343, anti-retraction rack; 344, anti-retraction rod; 345, fixed shaft; 346, reset shaft; 400, bolt; 410, screw; 420, nut; 500, workbench; 510, limit slide groove. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0043] In practice, it is found that as the stamping process progresses, the mold will become loose. Once the looseness reaches a certain extent, the mold will be misplaced during the stamping process, which will cause excessive wear, not only causing the workpiece to be scrapped, but also causing damage to the mold.

[0044] The main reason is that the main way to fix the metal mold during processing is to use bolts to connect the template to the workbench, and the impact received by the hardware mold during work will be fed back to the nut, causing the nut to rotate continuously and become loose.

[0045] See attached Figure 1-Figure 7 As shown, in order to solve the above problems, a hardware mold processing and fixing device is provided, including: a suppression front end 100, a suppression middle piece 200, and a suppression rear end 300.

[0046] In this solution, the suppression front end 100 is connected to the suppression rear end 300 through the suppression middle piece 200. When the suppression rear end 300 fixes the suppression middle piece 200, the suppression front end 100 is locked synchronously, and the suppression front end 100 is adapted to the bolt 400 of the fixed mold a, and the rotation loosening of the bolt 400 is suppressed in the locked state. Similarly, the suppression rear end 300 is connected to the workbench 500 to suppress the bolt 400.

[0047] It should be noted that in this solution, a mold is placed on the workbench 500, and a plurality of T-shaped limiting grooves 510 are provided on the surface in contact with the mold. That is, both the upper mold and the lower mold are placed on the corresponding workbench 500, so in this solution, only the lower mold and the workbench 500 on which the lower mold is placed are described, and the upper mold and the workbench 500 on which the upper mold is placed are not described in detail.

[0048] Likewise, in this solution, the specific structure of the bolt 400 is described.

[0049] The bolt 400 includes a screw rod 410 and a nut 420 . The screw rod 410 is a T-shaped structure, and the corresponding end portion thereof is slidably matched with the limiting sliding groove 510 .

[0050] In addition, the bottom of the rear end 300 is restrained from slidingly cooperating with the limiting slide groove 510 , and the specific cooperating relationship will be described in detail later.

[0051] This solution sets a suppression front end 100, a suppression middle piece 200, and a suppression rear end 300. When the suppression rear end 300 fixes the suppression middle piece 200, the suppression front end 100 is locked synchronously, and the suppression front end 100 is suppressed from rotating and loosening the bolt 400 in the locked state, thereby preventing the nut 420 from rotating during the vibration of repeated stamping of the mold, thereby suppressing the loosening of the nut 420 and avoiding the problem of loosening of the mold during processing.

[0052] See attached Figure 3-Figure 5 As shown, in this solution, a specific implementation of the restraining front end 100 is provided. The restraining front end 100 is used to restrain the rotation problem of the nut 420.

[0053] The suppression front end 100 includes an adjustable limiting sleeve 110 and a fixed locking sleeve 120 .

[0054] Specifically, the lower inner portion of the adjustable limiting sleeve 110 has a hole 111 that matches the nut 420 , and the upper inner portion of the adjustable limiting sleeve 110 has a hole 112 that matches the top end corresponding to the screw rod 410 .

[0055] The adjustable stop sleeve 110 is a cylindrical structure, and the internal channel structure is variable. The channel 111 cooperates with the nut 420, that is, the lower part of the adjustable stop sleeve 110 constitutes an inner hexagonal structure, which just matches the nut 420 when it is sleeved on the nut 420. The channel 2 112 cooperates with the top of the screw rod 410, and the top specifically refers to the end for the nut 420 to be screwed in. When the nut 420 and the screw rod 410 are fully matched, the end of the screw rod 410 extends to the top surface of the nut 420, so it is necessary to avoid this part of the screw rod 410 to avoid interference with the adjustable stop sleeve 110. Therefore, the adjustable stop sleeve 110 can completely cover the bolt 400 that extends out of the mold surface.

[0056] In addition, the top end of the adjustable limiting sleeve 110 and the bottom end of the fixed locking sleeve 120 are rotatably connected through a buckle structure, and the top surface of the adjustable limiting sleeve 110 and the corresponding surface of the fixed locking sleeve 120 are both provided with mutually matching tooth structures 113.

[0057] The buckled structure is specifically two ring bodies with L-shaped cross-sections, which are buckled together to form a rotating structure. The adjustable limit sleeve 110 and the fixed locking sleeve 120 achieve relative rotation based on this structure. Preferably, there is a gap between the ring bodies.

[0058] A return spring 121 is provided inside the fixed locking sleeve 120, the top end of the return spring 121 cooperates with the inner top wall of the fixed locking sleeve 120, and the bottom end cooperates with the inner top surface of the adjustable limiting sleeve 110;

[0059] In a normal state, the return spring 121 is in a compressed state, and the tooth structure 113 on the adjustable limiting sleeve 110 is not engaged with the tooth structure 113 on the fixed locking sleeve 120 .

[0060] In normal state, the tooth structure 113 is not in contact, which is achieved by the gap. Since the reset spring 121 is in a compressed state, a force is provided to separate the adjustable limit sleeve 110 from the fixed locking sleeve 120. At this time, the gap between the ring bodies disappears, and the gap is transferred to the tooth structure 113. In this state, the adjustable limit sleeve 110 and the fixed locking sleeve 120 can rotate at any angle, so that the adjustable limit sleeve 110 can be sleeved on the nut 420 in different position states.

[0061] Preferably, one tooth surface on the tooth structure 113 is an inclined surface, and another adjacent tooth surface is a vertical surface perpendicular to the top surface of the adjustable limiting sleeve 110 .

[0062] When the nut 420 rotates in the loosening direction, the tooth structure 113 on the adjustable stop sleeve 110 meshes with the tooth structure 113 on the fixed locking sleeve 120, and the meshing tooth surfaces are all vertical surfaces. At this time, the vertical surfaces of the tooth structures 113 mesh with each other, and the adjustable stop sleeve 110 cannot rotate in the loosening direction with the nut 420. Therefore, the nut 420 is subjected to a force in the tightening direction, which keeps the nut 420 from loosening.

[0063] See attached Figure 1-Figure 2 In this solution, a plurality of fixed locking sleeves 120 are provided, and each is connected to a corresponding suppression middle piece 200. Specifically, the fixed locking sleeves 120 are evenly distributed on the suppression middle piece 200. Preferably, the suppression middle piece 200 is a flat strip structure, which is used to apply a force to the fixed locking sleeve 120, forcing the tooth structure 113 on the adjustable limit sleeve 110 to not mesh with the tooth structure 113 on the fixed locking sleeve 120.

[0064] When there are two fixed locking sleeves 120 , the fixed locking sleeves 120 are located at both ends of the suppression middle piece 200 , and the suppression middle piece 200 is provided with a through hole 210 that matches with the suppression rear end 300 .

[0065] This solution provides an implementation method when there are two fixed locking sleeves 120. When the suppression method of this solution is adopted, at least one set of suppression intermediate pieces 200 is respectively arranged on the edge of the mold perpendicular to the limiting slide groove 510.

[0066] See attached Figure 6-Figure 7 As shown, in combination with the above, a specific implementation of the suppression rear end 300 is given. The suppression rear end 300 is used to lock and fix the suppression middle piece 200.

[0067] The suppression rear end 300 includes: a pressure cap 310, a support seat assembly 320, and a limiting slider 330. The pressure cap 310 is located at the top of the support seat assembly 320 and movably cooperates with the support seat assembly 320. The limiting slider 330 is located at the bottom of the support seat assembly 320 and slidably cooperates with the limiting slide groove 510.

[0068] Specifically, the pressing cap 310 cooperates with the support seat assembly 320 to prevent the middle piece 200 from being fixed. When the pressing cap 310 is fixed, the lower part of the pressing cap 310 extends into the support seat assembly 320 and is locked and fixed by the support seat assembly 320. The limiting slider 330 has the same structure as the rod head at the bottom end of the screw rod 410, and both are slidably matched with the limiting slide groove 510.

[0069] When the pressing cap 310 cooperates with the supporting base assembly 320 to fix the suppression intermediate member 200 , the locking sleeve 120 is fixed to form a stable structure with the supporting base assembly 320 .

[0070] Preferably, the pressing cap 310 is a T-shaped structure, the bottom end of which passes through the through hole 210 and extends to the inside of the support seat assembly 320 . The support seat assembly 320 has a fixing assembly 340 for locking or loosening the pressing cap 310 .

[0071] When the pressing cap 310 is locked by the fixing assembly 340 , the tooth structure 113 on the adjustable limiting sleeve 110 is meshed with the tooth structure 113 on the fixed locking sleeve 120 .

[0072] The fixing assembly 340 is used to lock the pressure cap 310 to fix the suppression middle piece 200 , and simultaneously complete the locking of the suppression front end 100 , thereby completing the suppression of the nut 420 .

[0073] See attached Figure 7 As shown, in combination with the above, a specific implementation of the fixing assembly 340 is provided.

[0074] The fixing assembly 340 includes a ratchet mechanism 341 , a locking rod 342 , a back-stop rack 343 , and a back-stop rod 344 .

[0075] Specifically, a cavity 321 is provided inside the support base assembly 320, and a notch 322 communicating with the cavity 321 is provided on the side wall of the support base assembly 320. One end of a locking rod 342 passes through the notch 322 and extends into the cavity 321, and one end of the locking rod 342 extending into the cavity 321 is connected to the ratchet mechanism 341, and the ratchet mechanism 341 is engaged with the rod portion of the pressure cap 310 extending into the cavity 321.

[0076] At this time, the ratchet mechanism 341 can be rotated by pulling the locking rod 342, and the rotation of the ratchet mechanism 341 will force the pressure cap 310 to extend into the cavity 321 due to the meshing action, and the reciprocating pulling of the locking rod 342 will force the pressure cap 310 to gradually lock the suppression middle piece 200 until the locking rod 342 cannot be pulled, indicating that the pressure cap 310 has completed locking the suppression middle piece 200.

[0077] After the locking is completed, the intermediate piece 200 is suppressed from being in a state of deformation under stress, that is, the pressure cap 310 is a pressure point, and the fixed locking sleeve 120 is a supporting point, which will suppress the intermediate piece 200 from being lifted up.

[0078] In addition, the backstop rack 343 is located at one side of the ratchet mechanism 341 and is meshed with the ratchet mechanism 341 in a normal state. One end of the backstop rack 343 is connected to a backstop rod 344 extending into the cavity 321 .

[0079] The engagement and separation of the anti-retraction rack 343 and the ratchet mechanism 341 can be achieved by pulling the anti-retraction rod 344. After the pressure cap 310 locks the suppression intermediate member 200, the anti-retraction rack 343 and the ratchet mechanism 341 are in an engaged state to prevent the ratchet mechanism 341 from rotating under force.

[0080] Specifically, the ratchet mechanism 341 and the locking rod 342 are connected to the inner wall of the cavity 321 via a fixed rotating shaft 345 , and the backstop rod 344 is connected to the inner wall of the cavity 321 via a reset rotating shaft 346 .

[0081] The locking rod 342 is equivalent to an active swing rod used to drive the ratchet wheel b to rotate. The forward rotation of the ratchet wheel b drives the outer gear c to rotate, and the reverse rotation has no effect on the gear c. The locking rod 342 and the ratchet wheel b are both located on the fixed shaft 345. By pulling the locking rod 342, the power is transmitted through the fixed shaft 345, which drives the ratchet wheel b to rotate, and then drives the gear c. In this way, the pressing cap 310 is gradually locked.

[0082] After the stop rod 344 rotates a certain angle, the stop rack 343 separates from the ratchet mechanism 341. In combination with the above, the stop rack 343 is meshed with the gear. When the stop rack 343 is meshed with the gear, the gear cannot rotate back, that is, it can only achieve the locking effect on the pressing cap 310. When the stop rod 344 is pulled, the stop rack 343 separates from the gear around the reset shaft 346. At this time, the gear can rotate in the reverse direction driven by the pressing cap 310.

[0083] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them.

Claims

1. A hardware mold processing fixing device, characterized in that: include: Suppress the frontend (100), suppress the middleware (200), suppress the backend (300); The suppression front end (100) is connected to the suppression back end (300) via the suppression middleware (200); The suppression rear end (300) simultaneously completes the locking of the suppression front end (100) when fixing the suppression middle piece (200), and the suppression front end (100) is adapted to the bolt (400) for fixing the mold, and the bolt (400) is inhibited from rotating and loosening in the locked state; The suppression rear end (300) is connected to the working table (500).

2. A hardware mold processing and fixing device according to claim 1, characterized in that: A mold is placed on the workbench (500), and a plurality of limiting sliding grooves (510) with T-shaped cross sections are provided on the surface in contact with the mold; The bolt (400) comprises a screw rod (410) and a nut (420); the screw rod (410) is a T-shaped structure, and the corresponding end portion is slidably matched with the limiting sliding groove (510); The bottom of the suppressing rear end (300) is slidably matched with the limiting sliding groove (510).

3. A hardware mold processing and fixing device according to claim 2, characterized in that: The suppression front end (100) comprises at least: an adjustable limiting sleeve (110) and a fixed locking sleeve (120); The lower inner portion of the adjustable limiting sleeve (110) has a first hole (111) that matches the nut (420), and the upper inner portion of the adjustable limiting sleeve (110) has a second hole (112) that matches the top end corresponding to the screw rod (410); The top end of the adjustable limiting sleeve (110) and the bottom end of the fixed locking sleeve (120) are rotatably connected via a buckle structure, and the top surface of the adjustable limiting sleeve (110) and the corresponding surface of the fixed locking sleeve (120) are both provided with tooth structures (113) that cooperate with each other; The fixed locking sleeve (120) has a return spring (121) inside, the top end of the return spring (121) cooperates with the inner top wall of the fixed locking sleeve (120), and the bottom end cooperates with the inner top surface of the adjustable limiting sleeve (110); In a normal state, the return spring (121) is in a compressed state, and the tooth structure (113) on the adjustable limiting sleeve (110) is not engaged with the tooth structure (113) on the fixed locking sleeve (120).

4. A hardware mold processing and fixing device according to claim 3, characterized in that: One tooth surface on the tooth structure (113) is an inclined surface, and another adjacent tooth surface is a vertical surface perpendicular to the top surface of the adjustable limiting sleeve (110); When the nut (420) rotates in the loosening direction, the tooth structure (113) on the adjustable limiting sleeve (110) meshes with the tooth structure (113) on the fixed locking sleeve (120), and the meshing tooth surfaces are both vertical surfaces.

5. A hardware mold processing and fixing device according to claim 3, characterized in that: The fixed locking sleeves (120) are all connected to the corresponding suppression middle pieces (200); When the number of the fixed locking sleeves (120) is two, the fixed locking sleeves (120) are located at both ends of the suppression middle piece (200), and the suppression middle piece (200) is provided with a through hole (210) that cooperates with the suppression rear end (300).

6. A hardware mold processing and fixing device according to claim 5, characterized in that: The suppression rear end (300) at least includes: a pressure cap (310), a support seat assembly (320), and a limiting slider (330); the pressure cap (310) is located at the top of the support seat assembly (320) and is movably matched with the support seat assembly (320); the limiting slider (330) is located at the bottom of the support seat assembly (320) and is slidably matched with the limiting slide groove (510).

7. A hardware mold processing and fixing device according to claim 6, characterized in that: The pressing cap (310) is a T-shaped structure, the bottom end of which passes through the through hole (210) and extends into the interior of the support seat assembly (320), and the support seat assembly (320) is provided with a fixing assembly (340) for locking or loosening the pressing cap (310); When the pressing cap (310) is locked by the fixing assembly (340), the tooth structure (113) on the adjustable limiting sleeve (110) meshes with the tooth structure (113) on the fixed locking sleeve (120).

8. A hardware mold processing and fixing device according to claim 7, characterized in that: The fixing assembly (340) comprises at least: a ratchet mechanism (341), a locking rod (342), a back-stop rack (343), and a back-stop rod (344); The support seat assembly (320) has a cavity (321) inside, and a side wall of the support seat assembly (320) has a notch (322) connected to the cavity (321), one end of the locking rod (342) passes through the notch (322) and extends into the cavity (321), the end of the locking rod (342) extending into the cavity (321) is connected to the ratchet mechanism (341), and the ratchet mechanism (341) is engaged with the rod body portion of the pressure cap (310) extending into the cavity (321); The anti-retraction rack (343) is located on one side of the ratchet mechanism (341) and is meshed with the ratchet mechanism (341) in a normal state. One end of the anti-retraction rack (343) is connected to a anti-retraction rod (344) extending into the cavity (321).

9. A hardware mold processing and fixing device according to claim 8, characterized in that: The ratchet mechanism (341) and the locking rod (342) are both connected to the inner wall of the cavity (321) via a fixed rotating shaft (345), and the back-stopping rod (344) is connected to the inner wall of the cavity (321) via a reset rotating shaft (346); After the back-stop rod (344) rotates a certain angle, the back-stop rack (343) is separated from the ratchet mechanism (341).

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