A C-type clamp spring automatic assembly mechanism

Abstract

This invention discloses an automatic assembly mechanism for C-type retaining springs, relating to the field of retaining spring production. It includes a base, the left side of the upper surface of which is fixedly connected to the bottom surface of a support plate. A pipe clamp feeding mechanism is provided on the front side of the upper surface of the support plate. The rear side of the upper surface of the support plate is simultaneously fixedly connected to the bottom ends of two telescopic rods and two vibrating motors. The upper ends of the two telescopic rods and two vibrating motors are respectively fixedly connected to the bottom ends of two fixed plates. The upper ends of the two fixed plates are both fixedly connected to the outer side of a feeding hopper. This invention achieves fully automated production, requiring only periodic feeding into the hopper. The capacity of a single machine is six times that of manual assembly, and one worker can simultaneously operate multiple machines, achieving a significant leap in production capacity and ensuring on-time product delivery, saving the company substantial labor costs.

Description

Technical Field

[0001] This invention relates to an assembly mechanism, and more particularly to an automatic assembly mechanism for C-type retaining springs. Background Technology

[0002] C-type retaining springs are prone to tangling, causing dimensional deformation and resulting in out-of-tolerance dimensions, as well as inconvenience for customers. Therefore, the customer requires that every 100 springs be neatly arranged and assembled onto a special packaging clamp with rebound force. The clamp ends are bent to prevent the retaining springs from detaching during transport, ensuring dimensional stability and easy customer access. The assembly process is currently manual, requiring the left hand to forcefully reduce the clamp's outer diameter to be smaller than the spring's inner diameter, while the right hand manually slides the springs onto the clamp one by one. Manual counting is necessary; once 100 springs are reached, the clamp ends are bent with pliers. Due to the high volume of this product, each person can only assemble 10,000 springs per shift, requiring multiple people for assembly, resulting in high efficiency, low cost, and heavy workload for employees. Therefore, an automated C-type retaining spring assembly mechanism was independently designed and manufactured to improve production efficiency, reduce labor costs, and ensure product delivery. Summary of the Invention

[0003] The purpose of this invention is to provide an automatic assembly mechanism for C-type retaining springs to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: an automatic assembly mechanism for C-type retaining springs, comprising a base, the left side of the upper surface of the base being fixedly connected to the bottom surface of a support plate, a pipe clamp feeding mechanism being provided on the front side of the upper surface of the support plate, the rear side of the upper surface of the support plate being fixedly connected to the bottom ends of two telescopic rods and two vibrating motors, the upper ends of the two telescopic rods and two vibrating motors being fixedly connected to the bottom ends of two fixed plates, the upper ends of the two fixed plates being fixedly connected to the outer side of the feeding hopper, the input ends of the two vibrating motors being electrically connected to the input end of a PLC control host, and the PLC control host being fixedly connected to the front side of the support plate;

[0005] The upper right surface of the base is fixedly connected to the bottom end of the frame, and the frame is equipped with a side bending mechanism and a pipe clamp transport mechanism.

[0006] As a preferred embodiment of the present invention, the front side of the upper surface of the frame is fixedly connected to the bottom end of the first fixing plate, the upper end of the first fixing plate is fixedly connected to the bottom end of the pipe clamp guide rod, and the upper rear side of the frame is simultaneously fixedly connected to one end of the limiting plate, the second fixing plate, and the fourth fixing plate.

[0007] As a preferred embodiment of the present invention, the opposing surfaces of the second and fourth fixing plates are respectively fixedly connected to the transmitting and receiving ends of the infrared counter. The infrared counter is bidirectionally electrically connected to the PLC control host. The lower inner side of the fourth fixing plate is fixedly connected to the bottom end of the fifth fixing plate, and the upper end of the fifth fixing plate is fixedly connected to the bottom end of the retaining spring guide rod. The left end of the retaining spring guide rod corresponds to the discharge port at the bottom of the feeding hopper.

[0008] As a preferred embodiment of the present invention, the front inner side of the fixed plate four is simultaneously fixedly connected to the front end of the counting cylinder, the retaining ring spring positioning cylinder, and the pipe clamp retraction clamping cylinder. The rear ends of the counting cylinder and the retaining ring spring positioning cylinder are respectively fixedly connected to two limit frames. The rear end of the pipe clamp retraction clamping cylinder is fixedly connected to the front side of the pressure plate. The pressure plate and the limit plate are placed in a corresponding manner. The input ends of the counting cylinder and the retaining ring spring positioning cylinder are electrically connected to the output end of the PLC control host.

[0009] As a preferred embodiment of the present invention, the pipe clamp feeding mechanism includes a pipe clamp hopper. The bottom surface of the pipe clamp hopper is fixedly connected to the upper surface of the support plate. The inner front side of the pipe clamp hopper is simultaneously fixedly connected to the front ends of two telescopic rods. The rear ends of the two telescopic rods are fixedly connected to the front side of the feeding plate. A spring is sleeved on each of the two telescopic rods. The two ends of the springs are fixedly connected to the inner front side of the pipe clamp hopper and the front side of the feeding plate, respectively. The left side of the pipe clamp hopper is fixedly connected to the left end of the discharge cylinder through a mounting seat. The right end of the discharge cylinder passes through a through hole on the left side of the pipe clamp hopper and is fixedly connected to the discharge plate. The right side of the pipe clamp hopper has a discharge groove corresponding to the discharge plate and the pipe clamp guide rod. The input end of the discharge cylinder is electrically connected to the output end of the PLC control host.

[0010] As a preferred embodiment of the present invention, the edge bending mechanism includes a fixed frame, the bottom surface of which is fixedly connected to the front side of the upper surface of the frame, the inner side of the front side of the fixed frame is fixedly connected to the front end of the bending cylinder, the rear end of the bending cylinder is fixedly connected to the bending plate, and the input end of the bending cylinder is electrically connected to the output end of the PLC control host.

[0011] As a preferred embodiment of the present invention, the pipe clamp transport mechanism includes two connecting plates, the bottom surfaces of the two connecting plates are fixedly connected to the upper surface of the frame, the middle parts of the two connecting plates are movably connected to the two optical shafts on both sides of the screw through rolling bearings, the front end of the screw is fixedly connected to the output shaft of the motor, and the motor is fixedly connected to the front side of the front connecting plate through a mounting base.

[0012] The screw is threaded into a screw hole in the middle of the transport plate. The transport plate also has two sleeve holes that are slidably connected to two slide rods. The two slide rods are fixedly connected to two connecting plates. The upper surface of the transport plate is fixedly connected to the fixed end of the transport cylinder. The extended end of the transport cylinder is fixedly connected to the right side of the connecting plate. The left side of the connecting plate is fixedly connected to the sleeve rod. The input ends of the transport cylinder and the motor are electrically connected to the output end of the PLC control host.

[0013] Compared with the prior art, the beneficial effects of the present invention are:

[0014] 1. The device of the present invention is perfectly suitable for the assembly of various specifications of retainer springs.

[0015] 2. The device of the present invention uses an electronic induction switch to measure the number of individual components assembled in the product, which can achieve accurate counting.

[0016] 3. The device of the present invention adopts a PLC control system, which uses a PLC program to stably and accurately control the cooperative operation of each mechanism component.

[0017] 4. The device of this invention has achieved fully automated production. It only requires feeding materials into the silo at regular intervals. The production capacity of a single machine is 6 times that of manual assembly. One worker can operate multiple machines at the same time, achieving a leap in production capacity and ensuring that products are delivered on time, saving the company a lot of labor costs. Attached Figure Description

[0018] Figure 1 This is a front view structural diagram of the present invention;

[0019] Figure 2 This is a schematic diagram of the rear view structure of the present invention;

[0020] Figure 3 This is a schematic diagram of the pipe clamp feeding mechanism of the present invention;

[0021] Figure 4 This is a schematic diagram of the edge bending mechanism of the present invention;

[0022] Figure 5 This is a schematic diagram of the pipe clamp handling mechanism of the present invention.

[0023] In the diagram: 1. Base, 2. Support plate, 3. PLC control host, 4. Pipe clamp feeding mechanism, 41. Pipe clamp hopper, 42. Spring, 43. Telescopic rod I, 44. Feeding plate, 45. Discharge plate, 46. Discharge cylinder, 5. Edge bending mechanism, 51. Fixing frame, 52. Bending cylinder, 53. Bending plate, 6. Pipe clamp handling mechanism, 61. Connecting plate I, 62. Slide rod, 63. Screw, 64. Handling plate, 65. Handling cylinder, 66. Motor, 67. Connecting plate II, 68. Sleeve rod, 7. Frame, 8. Fixing plate I, 9. Pipe clamp guide rod, 10. Limiting plate, 11. Clamping ring spring guide rod, 12. Fixing plate II, 13. Fixing plate III, 14. Feeding hopper, 15. Telescopic rod II, 16. Vibration motor, 17. Limiting frame, 18. Counting cylinder, 19. Infrared counter, 20. Clamping ring spring positioning cylinder, 21. Pipe clamp retraction clamping cylinder, 22. Pressure plate, 23. Fixing plate IV. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] Please see Figure 1-5 This invention provides a technical solution for an automatic assembly mechanism for C-type retaining springs: it includes a base 1, the left side of the upper surface of the base 1 is fixedly connected to the bottom surface of a support plate 2, a pipe clamp feeding mechanism 4 is provided on the front side of the upper surface of the support plate 2, the rear side of the upper surface of the support plate 2 is simultaneously fixedly connected to the bottom ends of two telescopic rods 15 and two vibrating motors 16, the upper ends of the two telescopic rods 15 and two vibrating motors 16 are respectively fixedly connected to the bottom ends of two fixed plates 13, the upper ends of the two fixed plates 13 are fixedly connected to the outer side of a feeding hopper 14, the input ends of the two vibrating motors 16 are electrically connected to the input ends of a PLC control host 3, the PLC control host 3 is fixedly connected to the front side of the support plate 2, the right side of the upper surface of the base 1 is fixedly connected to the bottom end of a frame 7, and a baffle bending mechanism 5 and a pipe clamp transporting mechanism 6 are provided on the frame 7.

[0026] The front side of the upper surface of the frame 7 is fixedly connected to the bottom end of the first fixing plate 8. The upper end of the first fixing plate 8 is fixedly connected to the bottom end of the pipe clamp guide rod 9. The upper rear side of the frame 7 is simultaneously fixedly connected to one end of the limit plate 10, the second fixing plate 12, and the fourth fixing plate 23. The opposite surfaces of the second fixing plate 12 and the fourth fixing plate 23 are respectively fixedly connected to the transmitting end and the receiving end of the infrared counter 19. The infrared counter 19 is bidirectionally electrically connected to the PLC control host 3. After the PLC control host 3 is running, it also controls the vibration. The motor 16 operates by vibrating the feeding hopper 14, causing the retaining springs inside the feeding hopper 14 to vibrate and arrange themselves, and then transported to the retaining spring guide rod 11. During this process, an infrared counter 19 is used to count the number of retaining springs on the retaining spring guide rod 11 between the two limit frames 17. The lower inner side of the fixing plate 4 23 is fixedly connected to the bottom end of the fixing plate 5, and the upper end of the fixing plate 5 is fixedly connected to the bottom end of the retaining spring guide rod 11. The left end of the retaining spring guide rod 11... Corresponding to the discharge port at the bottom of the feeding hopper 14, the front inner side of the fixing plate 23 is simultaneously fixedly connected to the front end of the counting cylinder 18, the retaining ring spring positioning cylinder 20, and the pipe clamp retraction clamping cylinder 21. The rear ends of the counting cylinder 18 and the retaining ring spring positioning cylinder 20 are respectively fixedly connected to two limit frames 17. When the retaining ring springs between the two limit frames 17 reach the target number, the PLC control host 3 controls the counting cylinder 18 to extend so that the left limit frame 17 is locked onto the retaining ring spring guide rod 11. Separate the retaining spring, and then the PLC control host 3 controls the retaining spring positioning cylinder 20 to retract, causing the right limit bracket 17 to disengage from the right end of the retaining spring guide rod 11. At this time, the retaining spring between the two limit brackets 17 slides onto the pipe clamp. The rear end of the pipe clamp retracts and clamps the cylinder 21 and is fixedly connected to the front side of the pressure plate 22. The pressure plate 22 and the limit plate 10 are placed in front and behind respectively. The input ends of the counting cylinder 18 and the retaining spring positioning cylinder 20 are electrically connected to the output end of the PLC control host 3.

[0027] The pipe clamp feeding mechanism 4 includes a pipe clamp hopper 41. The bottom surface of the pipe clamp hopper 41 is fixedly connected to the upper surface of the support plate 2. The inner front side of the pipe clamp hopper 41 is simultaneously fixedly connected to the front ends of two telescopic rods 43. The rear ends of the two telescopic rods 43 are fixedly connected to the front side of the feeding plate 44. A spring 42 is sleeved on each of the two telescopic rods 43. The two ends of the two springs 42 are fixedly connected to the inner front side of the pipe clamp hopper 41 and the front side of the feeding plate 44, respectively. The feeding plate 44 is connected to the pipe clamp hopper 41 by setting the telescopic rods 43 and the springs 42. Thus, after a pipe clamp is pushed onto the pipe clamp guide rod 9 by the discharge plate 45, the remaining pipe clamps in the pipe clamp hopper 41 are pushed backward by the spring force of the spring 42 to correspond to the discharge groove. The left side of the pipe clamp hopper 41 is fixedly connected to the left end of the discharge cylinder 46 through the mounting seat. The right end of the discharge cylinder 46 passes through the through hole opened on the left side of the pipe clamp hopper 41 and is fixedly connected to the discharge plate 45. The right side of the pipe clamp hopper 41 is provided with a discharge groove corresponding to the discharge plate 45 and the pipe clamp guide rod 9. The input end of the discharge cylinder 46 is electrically connected to the output end of the PLC control host 3.

[0028] The edge bending mechanism 5 includes a fixed frame 51. The bottom surface of the fixed frame 51 is fixedly connected to the front side of the upper surface of the frame 7. The inner side of the front side of the fixed frame 51 is fixedly connected to the front end of the bending cylinder 52. The rear end of the bending cylinder 52 is fixedly connected to the bending plate 53. The input end of the bending cylinder 52 is electrically connected to the output end of the PLC control host 3.

[0029] The pipe clamp transport mechanism 6 includes two connecting plates 61. The bottom surfaces of both connecting plates 61 are fixedly connected to the upper surface of the frame 7. The middle parts of the two connecting plates 61 are movably connected to the two optical shafts on both sides of the screw 63 via rolling bearings. The front end of the screw 63 is fixedly connected to the output shaft of the motor 66. The motor 66 is fixedly connected to the front side of the front connecting plate 61 via a mounting base. The screw 63 is threaded into a screw hole in the middle of the transport plate 64. The transport plate 64 also has two sleeve holes that are slidably connected to two slide rods 62. Rod 62 is fixedly connected to two connecting plates 61 respectively. The upper surface of the conveying plate 64 is fixedly connected to the fixed end of the conveying cylinder 65. The extended end of the conveying cylinder 65 is fixedly connected to the right side of the connecting plate 67. The left side of the connecting plate 67 is fixedly connected to the sleeve rod 68. The input ends of the conveying cylinder 65 and the motor 66 are electrically connected to the output end of the PLC control host 3. By setting the pipe clamp conveying mechanism 6 and connecting it to the frame 7, the position of the sleeve rod 68 and the pipe clamp can be adjusted by the pipe clamp conveying mechanism 6 to achieve continuous operation of the whole device.

[0030] The operation steps of this invention are as follows:

[0031] When using this device, the user first pulls the feeding plate 44 forward to compress the telescopic rod 43 and spring 42. Then, the pipe clamps are arranged in sequence in the pipe clamp hopper 41, and the retaining spring is placed in the upper hopper 14. The user then controls the main unit 3 via PLC. At this time, the PLC main unit 3 controls the discharge cylinder 46 to extend, using the discharge plate 45 to push out the pipe clamp, causing the pipe clamp to slide along the pipe clamp guide rod 9 to the position of the edge bending mechanism 5. Then, the PLC main unit 3 controls the bending cylinder 52 to extend, using the bending plate 53 to compress and bend the edge of the pipe clamp. After bending, the PLC main unit 3 controls the bending cylinder 52 to retract, causing the bending plate 53 to retract. 3. The pipe clamp is disengaged from the guide rod 9. At this time, the pipe clamp slides onto the sleeve rod 68. Then, the PLC control host 3 controls the motor 66 to work, so that the screw 63 rotates clockwise and drives the transport plate 64 to move backward. When the transport plate 64 drives the sleeve rod 68 to move to the position corresponding to the retaining spring guide rod 11, the motor 66 stops working. Then, the PLC control host 3 controls the transport cylinder 65 to extend so that the front end of the pipe clamp is between the pressure plate 22 and the limit plate 10. Subsequently, the PLC control host 3 controls the pipe clamp retraction clamping cylinder 21 to extend and use the pressure plate 22 to squeeze the pipe clamp. When the outer diameter of the pipe clamp is smaller than the inner diameter of the retaining spring, the pipe clamp retraction clamping cylinder 21 retracts and the pressure plate 22 is disengaged from the pipe clamp.

[0032] After the PLC control host 3 starts running, it also controls the vibration motor 16 to work, which drives the feeding hopper 14 to vibrate, causing the retaining springs in the feeding hopper 14 to vibrate and arrange themselves and be transported to the retaining spring guide rod 11. During this process, the infrared counter 19 is used to count the number of retaining springs on the retaining spring guide rod 11 between the two limit frames 17. When the number of retaining springs between the two limit frames 17 reaches the target number, the PLC control host 3 controls the counting cylinder 18 to extend, so that the left limit frame 17 is locked on the retaining spring guide rod 11 to separate the retaining springs. Then the PLC controls the main... Machine 3 controls the retraction of the retaining spring positioning cylinder 20, causing the right limit frame 17 to disengage from the right end of the retaining spring guide rod 11. At this time, the retaining spring between the two limit frames 17 slides onto the pipe clamp. Then, PLC control host 3 controls motor 66 to reverse, causing the pipe clamp with the retaining spring in place to move to correspond with the pipe clamp guide rod 9. At this time, PLC control host 3 controls bending cylinder 52 to extend and uses bending plate 53 to bend the upper edge of the pipe clamp. Then, PLC control host 3 controls motor 66 to rotate forward, moving sleeve rod 68 to the middle of the conveying mechanism 6. At this time, the user can unload the assembled pipe clamp.

[0033] In the description of this invention, it should be understood that the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0034] In this invention, unless otherwise explicitly specified and limited, for example, it can be a fixed connection, a detachable connection, or an integral part; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two elements or an interaction between two elements. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0035] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An automatic assembly mechanism for C-type retaining springs, comprising a base (1), characterized in that: The upper surface of the base (1) is fixedly connected to the bottom surface of the support plate (2) on the left side. The upper surface of the support plate (2) is provided with a pipe clamp feeding mechanism (4). The upper surface of the support plate (2) is fixedly connected to the bottom of two telescopic rods (15) and two vibration motors (16) at the same time. The upper ends of the two telescopic rods (15) and two vibration motors (16) are fixedly connected to the bottom of two fixed plates (13) respectively. The upper ends of the two fixed plates (13) are fixedly connected to the outer side of the feeding hopper (14). The input ends of the two vibration motors (16) are electrically connected to the input end of the PLC control host (3). The PLC control host (3) is fixedly connected to the front side of the support plate (2). The upper surface right side of the base (1) is fixedly connected to the bottom end of the frame (7), and the frame (7) is provided with a flange bending mechanism (5) and a pipe clamp transport mechanism (6). The front side of the upper surface of the frame (7) is fixedly connected to the bottom end of the fixing plate (8), and the upper end of the fixing plate (8) is fixedly connected to the bottom end of the pipe clamp guide rod (9). The pipe clamp feeding mechanism (4) includes a pipe clamp hopper (41), and a discharge groove is opened on the right side of the pipe clamp hopper (41) corresponding to the pipe clamp guide rod (9). The edge bending mechanism (5) includes a fixed frame (51), the front inner side of the fixed frame (51) is fixedly connected to the front end of the bending cylinder (52), and the rear end of the bending cylinder (52) is fixedly connected to the bending plate (53). The pipe clamp transport mechanism (6) includes two connecting plates (61). The middle parts of the two connecting plates (61) are movably connected to the two optical shafts on both sides of the screw (63) through rolling bearings. The screw (63) is threadedly connected to the middle part of the transport plate (64) and opened in the screw hole. The upper surface of the transport plate (64) is fixedly connected to the fixed end of the transport cylinder (65). The extended end of the transport cylinder (65) is fixedly connected to the right side of the connecting plate (67). The left side of the connecting plate (67) is fixedly connected to the sleeve rod (68).

2. The automatic assembly mechanism for a C-type retaining spring according to claim 1, characterized in that: The upper rear end of the frame (7) is simultaneously fixedly connected to one end of the limiting plate (10), the second fixing plate (12), and the fourth fixing plate (23).

3. The automatic assembly mechanism for C-type retaining springs according to claim 2, characterized in that: The opposing surfaces of the second fixed plate (12) and the fourth fixed plate (23) are respectively fixedly connected to the transmitting end and the receiving end of the infrared counter (19). The infrared counter (19) is bidirectionally electrically connected to the PLC control host (3). The lower inner side of the fourth fixed plate (23) is fixedly connected to the bottom end of the fifth fixed plate, and the upper end of the fifth fixed plate is fixedly connected to the bottom end of the retaining spring guide rod (11). The left end of the retaining spring guide rod (11) corresponds to the discharge port at the bottom end of the feeding hopper (14).

4. The automatic assembly mechanism for a C-type retaining spring according to claim 3, characterized in that: The front inner side of the fixed plate four (23) is fixedly connected to the front end of the counting cylinder (18), the retaining spring positioning cylinder (20) and the pipe clamp shrinking clamping cylinder (21). The rear ends of the counting cylinder (18) and the retaining spring positioning cylinder (20) are fixedly connected to the two limit frames (17) respectively. The rear end of the pipe clamp shrinking clamping cylinder (21) is fixedly connected to the front side of the pressure plate (22). The pressure plate (22) and the limit plate (10) are placed in front and behind respectively. The input ends of the counting cylinder (18) and the retaining spring positioning cylinder (20) are electrically connected to the output end of the PLC control host (3).

5. The automatic assembly mechanism for C-type retaining springs according to claim 1, characterized in that: The bottom surface of the pipe clamp hopper (41) is fixedly connected to the upper surface of the support plate (2). The front inner side of the pipe clamp hopper (41) is simultaneously fixedly connected to the front ends of two telescopic rods (43). The rear ends of the two telescopic rods (43) are fixedly connected to the front side of the feeding plate (44). Springs (42) are sleeved on the two telescopic rods (43). The two ends of the two springs (42) are respectively connected to the front inner side of the pipe clamp hopper (41) and the feeding plate (44). The front side of the pipe clamp hopper (41) is fixedly connected. The left side of the pipe clamp hopper (41) is fixedly connected to the left end of the discharge cylinder (46) through the mounting seat. The right end of the discharge cylinder (46) passes through the through hole opened on the left side of the pipe clamp hopper (41) and is fixedly connected to the discharge plate (45). The right side of the pipe clamp hopper (41) is provided with a discharge groove corresponding to the discharge plate (45). The input end of the discharge cylinder (46) is electrically connected to the output end of the PLC control host (3).

6. The automatic assembly mechanism for a C-type retaining spring according to claim 1, characterized in that: The bottom surface of the fixed frame (51) is fixedly connected to the front side of the upper surface of the frame (7), and the input end of the bending cylinder (52) is electrically connected to the output end of the PLC control host (3).

7. The automatic assembly mechanism for a C-type retaining spring according to claim 1, characterized in that: The bottom surfaces of the two connecting plates (61) are fixedly connected to the upper surface of the frame (7), the front end of the screw (63) is fixedly connected to the output shaft of the motor (66), and the motor (66) is fixedly connected to the front side of the front connecting plate (61) through the mounting base. The transport plate (64) also has two sleeve holes that are slidably connected to two slide rods (62) respectively. The two slide rods (62) are fixedly connected to two connecting plates (61) respectively. The input ends of the transport cylinder (65) and the motor (66) are electrically connected to the output end of the PLC control host (3).

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