Machining equipment for heat exchanger production

Abstract

The invention discloses machining equipment for heat exchanger production. The machining equipment comprises an equipment body, a lifting assembly is arranged on the equipment body, a stamping seat is fixedly connected to the lower end of the lifting assembly, a stamping assembly is arranged on the stamping seat, a stamping platform is arranged below the stamping seat, and a base is arranged on the stamping platform. When the device is implemented, a user places a to-be-machined tubular blank in the containing bin, when the stamping base drives the stamping assembly to move downwards, a pipe located in the containing bin can slide off, only one pipe can slide off at a time, the sliding-off pipe blank enters the temporary storage groove firstly and then enters the machining groove, and the machining efficiency is improved. The punching assembly can machine the pipe fitting blank located in the machining groove, after machining is completed, the pipe fitting can be pushed to the flow guide face, then the pipe fitting slides to one side of the device, the purpose of automatic feeding and discharging is achieved, and use of a user is facilitated.

Description

Technical Field

[0001] This invention belongs to the field of stamping equipment technology, specifically a processing equipment for heat exchanger production. Background Technology

[0002] In heat exchangers, whether plate radiators or shell-and-tube heat exchangers, tubes are a crucial component. The production of heat exchange tubes requires the use of stamping equipment.

[0003] In existing technologies, when pipes need to be stamped, the process involves either manually placing the pipes onto the stamping equipment or using electronically controlled components to feed the pipes. However, in heat exchanger production, the demand for pipes is large. Manual methods are not only inefficient but also have low precision, easily leading to processing errors. On the other hand, using electronically controlled components requires additional circuitry and movable tooling, which is cumbersome.

[0004] Therefore, this application proposes a processing equipment for heat exchanger manufacturing. Summary of the Invention

[0005] In view of the above situation and to overcome the defects of the prior art, the present invention provides a processing equipment for heat exchanger production, which effectively solves the problems in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a processing equipment for heat exchanger production, comprising a main body, a lifting assembly on the main body, a stamping seat fixedly connected to the lower end of the lifting assembly, a stamping assembly on the stamping seat, a stamping platform below the stamping seat, a base on the stamping platform, and a receiving chamber fixedly connected to one side of the main body.

[0007] The receiving compartment is a box-shaped structure with an open top. Two movable base plates are located at the bottom of the receiving compartment. The two ends of each movable base plate are hinged to the side wall of the receiving compartment. The free ends of the movable base plates can rotate up and down, and when the movable base plate is rotated to its lowest position, one of the pipe components inside the receiving compartment can fall down.

[0008] Preferably, the base is provided with a temporary storage groove, a processing groove, and a flow guiding surface, and the three are arranged side by side. The temporary storage groove is located on the side close to the receiving chamber, and the pipe falling from the receiving chamber can enter the temporary storage groove. A push plate is provided in the processing groove, which can fix the pipe located in the processing groove. When the push plate is reset, the pipe located in the processing groove can first slide to the flow guiding surface, and then the pipe located in the temporary storage groove can slide into the processing groove.

[0009] Preferably, the two movable base plates are symmetrically arranged, and a rotatable lead screw is provided inside the receiving compartment. Two support rods are connected to the external thread of the lead screw. The two support rods can respectively abut against the lower end of the movable base plate, and the thread directions of the two support rods are opposite, so that when the lead screw rotates, the two support rods can move closer to each other / away from each other. A connecting plate is also provided inside the receiving compartment. The connecting plate is inclined, and the lower end of the connecting plate extends to the upper side of the temporary storage groove.

[0010] Preferably, a fixing plate is fixedly connected to the side of the main body of the equipment, the receiving chamber is fixedly connected to the fixing plate, one end of the lead screw extends to one side of the receiving chamber, and a gear is fixedly connected to the end of the lead screw. A fixing plate is fixedly connected to the stamping seat. When the fixing plate moves up and down with the stamping seat, the fixing plate can cooperate with the gear to make the gear rotate.

[0011] Preferably, the base is provided with two pipe fitting actuating components, which are located in the temporary storage groove and the processing groove, respectively.

[0012] Preferably, two actuating blocks are movably arranged on the inner wall of the processing groove. When the push plate slides to one side, the push plate can first cooperate with one of the actuating blocks and then cooperate with the other actuating block. The actuating blocks are installed on the mounting base. One end of the first connecting rope is installed on the blocking block, and the other end of the connecting rope is connected to the mounting base. The mounting base and the base are connected by a second spring.

[0013] Preferably, the pipe fitting actuating component includes a pressure band, a temporary storage groove and a processing groove, both of which are arc-shaped groove structures with an arc angle of less than 180°. The pressure band is disposed on the inner wall of the groove structure, with one end of the pressure band fixedly connected to the inner wall of the groove structure and the other end extending into the base. A rotatable winding wheel is disposed in the base, and the pressure band is wound around the surface of the winding wheel. The winding wheel is connected to the base through a first torsion spring. A connecting rod is fixedly connected to the axis of the winding wheel, and one end of a second connecting rope is wound around one end of the connecting rod, while the other end of the second connecting rope is connected to the mounting base.

[0014] Preferably, the pipe fitting actuating component includes an air bladder, which has a temporary storage groove and a processing groove on its groove wall. One end of a pipe is provided on the air bladder, and the other end of the pipe is connected to a sealing cavity. A sealing sheet is provided in the sealing cavity, and an actuating rod is fixedly connected to the sealing sheet. The actuating rod is connected to a mounting base.

[0015] Preferably, the blocking block is disposed on the base and is connected to the base by a first spring. When the push plate slides to one side, the blocking block can move downward.

[0016] Preferably, a slot is provided in the mounting base located near the push plate, and the toggle block is rotatably installed in the insert block. The insert block is set in the slot and has an inclined groove. Insertion teeth are fixed to the inner wall of the slot, and the free ends of the insertion teeth are inserted into the inclined groove. A rotating shaft is fixed to the toggle block, and a second torsion spring is sleeved on the rotating shaft. A right-angle groove is provided in the insert block, and the rotating shaft is rotatably installed in the right-angle groove so that the toggle block can only rotate to one side.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] When this device is implemented, the user places the tubular blank to be processed in the receiving chamber. When the stamping seat moves the stamping assembly downwards, the tube in the receiving chamber can slide down, and only one tube can slide down at a time. The slid-down tube blank first enters the temporary storage groove, and then enters the processing groove. The stamping assembly can process the tube blank in the processing groove. After processing, the tube can be pushed onto the guide surface, and then slide down to one side of the device, thus achieving the purpose of automatic loading and unloading, which is convenient for users. Moreover, this device does not require a large number of external electrical control devices, which to a certain extent ensures the stability of the device's operation. Attached Figure Description

[0019] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0020] Figure 1 This is a schematic diagram of one side of the overall structure of the present invention;

[0021] Figure 2 This is a schematic diagram of the internal structure of the receiving compartment of the present invention;

[0022] Figure 3 This is a top view of the base plate of the present invention.

[0023] Figure 4 This is a schematic diagram of the internal structure of the base plate in Embodiment 1 of the present invention;

[0024] Figure 5 For the present invention Figure 4 Schematic diagram of the mating structure between the push plate and the pressure belt;

[0025] Figure 6 This is a schematic diagram of the internal structure of the base plate in Embodiment 2 of the present invention;

[0026] Figure 7 For the present invention Figure 6 Schematic diagram of the cooperation structure between the push plate and the airbag;

[0027] Figure 8 This is a schematic diagram of the internal structure of one of the mounting bases of the present invention.

[0028] In the diagram: 1. Main body of the equipment; 2. Lifting assembly; 3. Stamping seat; 4. Base; 5. Fixing lever; 6. Reception chamber; 7. Fixing plate; 8. Connecting plate; 9. Gear; 10. Movable base plate; 11. Support rod; 12. Lead screw; 13. Temporary storage groove; 14. Machining groove; 15. Guide surface; 16. Pressure belt; 17. Blocking block; 18. First spring; 19. First connecting rope; 20. Winding wheel; 21. Connecting rod; 22. Actuating block; 23. Mounting seat; 24. Second spring; 25. Second connecting rope; 26. Push plate; 27. First torsion spring; 28. Second torsion spring; 29. ​​Insertion block; 30. Inclined groove; 31. Insertion tooth; 32. Airbag; 33. Pipe; 34. Sealing cavity; 35. Sealing plate; 36. Actuating rod. Detailed Implementation

[0029] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0030] Depend on Figure 1-8 This invention discloses a processing equipment for heat exchanger production, comprising a main body 1, a lifting assembly 2 mounted on the main body 1, a stamping seat 3 fixedly connected to the lower end of the lifting assembly 2, a stamping assembly mounted on the stamping seat 3, a stamping platform below the stamping seat 3, a base 4 mounted on the stamping platform, and a receiving chamber 6 fixedly connected to one side of the main body 1. The receiving chamber 6 can hold several tubular blanks, and its length can be matched to the length of the pipes to be processed, thereby preventing the pipes from tilting and getting stuck within the receiving chamber 6.

[0031] The receiving chamber 6 is a box-shaped structure with an open top. Two movable base plates 10 are provided at the lower end of the receiving chamber 6. The two ends of the movable base plates 10 are respectively hinged to the side wall of the receiving chamber 6. The free ends of the movable base plates 10 can rotate up and down. When the movable base plates 10 rotate to the lowest position, one of the pipes in the receiving chamber 6 can fall down. When the movable base plates 10 rotate downward, there is a gap between the two movable base plates 10, and the pipe blank can fall through the gap. When the movable base plates 10 rotate upward, the surface of the movable base plates 10 can clamp the pipe blank that has not detached from the receiving chamber 6, so as to ensure that only one pipe blank can fall at a time. The rotation of the two movable base plates 10 forms a funnel-like structure, which facilitates the material discharge.

[0032] The base 4 is provided with a temporary storage groove 13, a processing groove 14 and a guide surface 15, which are arranged side by side. The temporary storage groove 13 is located on the side close to the receiving chamber 6. The pipes falling from the receiving chamber 6 can enter the temporary storage groove 13. A push plate 26 is provided in the processing groove 14. The push plate 26 can fix the pipes located in the processing groove 14 (the push plate 16 pushes to one side, so that the pipes are squeezed and fixed). When the push plate 26 is reset, the pipes located in the processing groove 14 can first slide onto the guide surface 15, and then the pipes located in the temporary storage groove 13 can slide into the processing groove 14.

[0033] When this device is implemented, the user places the tubular blank to be processed in the receiving chamber 6. When the stamping seat 3 moves the stamping assembly downward, the tube in the receiving chamber 6 can slide down, and only one can slide down at a time. The slid-down tube blank first enters the temporary storage groove 13, and then enters the processing groove 14. The stamping assembly can process the tube blank in the processing groove 14. After processing, the tube can be pushed onto the guide surface 15, and then slide down to one side of the device, thereby achieving the purpose of automatic loading and unloading, which is convenient for the user.

[0034] Two movable base plates 10 are symmetrically arranged. Inside the receiving chamber 6, there is a rotatable lead screw 12. Two support rods 11 are threaded to the external of the lead screw 12. The two support rods 11 can respectively abut against the lower end of the movable base plate 10, and the threads of the two support rods 11 are opposite, so that when the lead screw 12 rotates, the two support rods 11 can move closer to each other / away from each other. A connecting plate 8 is also provided inside the receiving chamber 6. The connecting plate 8 is inclined, and the lower end of the connecting plate 8 extends to the upper side of the temporary storage groove 13.

[0035] The connecting plate 8 can guide the tubular blank that slides down from the receiving chamber 6 into the temporary storage groove 13, and the distance between the connecting plate 8 and the movable base plate 10 can also support the tubular blank and prevent a large amount of tubular blank from falling down.

[0036] A fixing plate 7 is fixedly connected to the side of the main body 1 of the equipment. The receiving chamber 6 is fixedly connected to the fixing plate 7. One end of the lead screw 12 extends to one side of the receiving chamber 6, and a gear 9 is fixedly connected to the end of the lead screw 12. A fixing plate 5 is fixedly connected to the stamping seat 3. When the fixing plate 5 moves up and down with the stamping seat 3, the fixing plate 5 can cooperate with the gear 9 so that the gear 9 can rotate.

[0037] When the stamping seat 3 moves downward, the fixed lever 5 on it can move the gear 9 (the two mesh with each other). The rotation of the gear 9 will cause the lead screw 12 to rotate accordingly. The lead screw 12 is threadedly engaged with the support rod 11. At this time, the two support rods 11 move away from each other, thereby causing the rotating base plate 10 to rotate downward. When the stamping seat 3 moves upward, the above movement process is reversed, and the rotating base plate 10 rotates upward and resets.

[0038] The base 4 is provided with two pipe actuators, which are located in the temporary storage groove 13 and the processing groove 14 respectively. The use of the pipe actuators can ensure the continuity of pipe blank processing. That is, after the pipe blank is processed, the pipe actuator can push the pipe in the processing groove 14 out and then push the pipe in the temporary storage groove 13 into the processing groove 14.

[0039] Two actuating blocks 22 are movably arranged on the inner wall of the processing groove 14. When the push plate 26 slides to one side, the push plate 26 can first cooperate with one of the actuating blocks 22, and then cooperate with the other actuating block 22. The actuating blocks 22 are installed on the mounting base 23. One end of the first connecting rope 19 is installed on the blocking block 17. The use of the blocking block 17 can prevent the pipes entering the temporary storage groove 13 or the processing groove 14 from sliding out due to their own inertia. The other end of the connecting rope 19 is connected to the mounting base 23. The mounting base 23 and the base 4 are connected by a second spring 24, so that the mounting 23 can be reset. Of course, the second spring 24 can also be reset by means of an electric mechanism (not shown in the figure), which is not limited in this application.

[0040] The push plate 26 can be either electric or pneumatic.

[0041] When the push plate 26 extends, it can hold the pipe in the processing groove 14 to ensure its stability and prevent it from moving during processing. After processing, the push plate 26 is reset. When it cooperates with the first actuating block 22, the blocking block 17 can move downward, and the pipe in the processing groove 14 can be pushed out and slid onto the guide surface 15. Then the push plate 26 can cooperate with the second actuating block 22, and the pipe in the temporary storage groove 13 can be pushed out into the processing groove 14.

[0042] The first embodiment of the pipe fitting actuating component includes: a pressure band 16, a temporary storage groove 13 and a processing groove 14, both of which are arc-shaped groove structures with an arc angle of less than 180°. The pressure band 16 is disposed on the inner wall of the groove structure. One end of the pressure band 16 is fixedly connected to the inner wall of the groove structure, and the other end extends into the base 4. A rotatable winding wheel 20 is disposed in the base 4. The pressure band 16 is wound around the surface of the winding wheel 20. The winding wheel 20 is connected to the base 4 through a first torsion spring 27. A connecting rod 21 is fixedly connected to the axis of the winding wheel 20. One end of a second connecting rope 25 is wound around one end of the connecting rod 21, and the other end of the second connecting rope 25 is connected to the mounting base 23.

[0043] After the pressure band 16 is tightened, the pipe fittings on it can be lifted upwards. The two ends of the pressure band 16 can be set with a certain angle to facilitate the sliding of the pipe fittings.

[0044] When the mounting base 23 is moved, the mounting base 23 can pull the blocking block 17 and the pressure band 16, thereby causing the blocking block 17 to move downward and the pressure band 16 to be tightened and straightened.

[0045] The second embodiment of the pipe fitting actuator includes: the pipe fitting actuator includes an air bladder 32, the air bladder 32 is provided on the groove wall of the temporary storage groove 13 and the processing groove 14, one end of the pipe 33 is provided on the air bladder 32, the other end of the pipe 33 is connected to the sealing cavity 34, the sealing cavity 34 is provided with a sealing sheet 35, and an actuating rod 36 is fixedly connected to the sealing sheet 35, the actuating rod 36 is connected to the mounting base 23.

[0046] By inflating air into the airbag 32, the tube can be lifted upwards. When the amount of air inflated reaches a certain level, the tube can slide to one side.

[0047] When the mounting base 23 is pushed, the mounting base 23 pushes the sealing plate 35 through the toggle lever 36. The sealing plate 35 slides in the sealing cavity 34, so that the air in the sealing cavity 34 enters the airbag 32 from the pipe 33, so as to inflate the airbag 32.

[0048] As shown in the figure, the blocking block 17 is disposed on the base 4. The blocking block 17 is located between the temporary storage groove 13 and the processing groove 14, and between the processing groove 14 and the guide surface 15. The blocking block 17 is connected to the base 4 through the first spring 18. When the push plate 26 slides to one side, the blocking block 17 can move downward.

[0049] When this device is implemented, the blocking block 17 located on the right side of the processing groove 14 will first move downward (allowing the pipe in the processing groove 14 to slide out first), and then the blocking block 17 located on the left side of the processing groove 14 will move downward (allowing the pipe in the temporary storage groove 13 to enter the processing groove 14). When the pipe in the temporary storage groove 13 slides into the processing groove 14, in order to prevent the pipe from directly crossing the processing groove 14 and rolling onto the guide surface 15, the following technical solution is provided: the blocking block 17 located on the right side of the processing groove 14 will first move downward (allowing the pipe in the temporary storage groove 13 to enter the processing groove 14). A slot is provided in the mounting base 23 on one side of the push plate 26. The toggle block 22 is rotatably installed in the insert block 29. The insert block 29 is set in the slot and has a slanted groove 30. An insertion tooth 31 is fixed to the inner wall of the slot. The free end of the insertion tooth 31 is inserted into the slanted groove 30. A rotating shaft is fixed to the toggle block 22. A second torsion spring 28 is sleeved on the rotating shaft. A right-angle groove is provided on the insert block 29. The rotating shaft is rotatably installed in the right-angle groove so that the toggle block 22 can only rotate to one side.

[0050] like Figure 3 As shown, from top to bottom, the two mounting bases 23 are the first mounting base and the second mounting base, respectively.

[0051] That is, when the push plate 26 pushes the first mounting seat near its position, the first mounting seat can move with it. At this time, the insertion teeth 31 slide in the inclined groove 30, causing the insertion block 29 to slide into the slot, thereby causing the actuating block 22 on the first mounting seat to separate from the push plate 26. Then the push plate 26 continues to move, and the first mounting seat can be reset under the action of the second spring 24, thereby causing the corresponding blocking block 17 to move upward and reset. Then the push plate 26 cooperates with the second mounting seat, allowing the pipe to enter the processing groove 14. When the push plate 26 resets, the second mounting seat can be reset under the action of the second spring 24. When the push plate 26 continues to move, it will cause the actuating block 22 on the first mounting seat to rotate. That is, when the push plate 26 moves in the opposite direction, it will not push the first mounting seat to move.

[0052] The actuating block 22 in the second mounting bracket is fixedly installed.

[0053] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0054] 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. A processing equipment for heat exchanger production, comprising an equipment main body (1), a lifting assembly (2) is arranged on the equipment main body (1), a lower end of the lifting assembly (2) is fixedly connected with a punching seat (3), and a punching assembly is arranged on the punching seat (3), characterized in that: The punch seat (3) is provided with a punch platform below, a base (4) is arranged on the punch platform, a containing bin (6) is fixed on one side of the equipment body (1), The containing bin (6) is a box structure with an open upper end, two movable bottom plates (10) are arranged at the lower end of the containing bin (6), the two ends of the movable bottom plates (10) are respectively hinged to the side walls of the containing bin (6), the free ends of the movable bottom plates (10) can rotate up and down, and when the movable bottom plates (10) are rotated to the lowest position, one of the pipes in the containing bin (6) can fall off, The base (4) is provided with a temporary storage groove (13), a processing groove (14) and a flow guide surface (15), and the three are arranged side by side, the temporary storage groove (13) is located on the side close to the containing bin (6), the pipe falling from the containing bin (6) can enter the temporary storage groove (13), a push plate (26) is arranged in the processing groove (14), the push plate (26) can fix the pipe in the processing groove (14), and when the push plate (26) is reset, the pipe in the processing groove (14) can first slide onto the flow guide surface (15), and then the pipe in the temporary storage groove (13) can slide into the processing groove (14).

2. The processing apparatus for heat exchanger production according to claim 1, characterized in that: The two movable bottom plates (10) are symmetrically arranged, a rotatable lead screw (12) is arranged in the containing bin (6), two supporting rods (11) are threadedly connected to the lead screw (12), the two supporting rods (11) can be respectively abutted against the lower ends of the movable bottom plates (10), and the screw directions of the two supporting rods (11) are opposite, so that when the lead screw (12) rotates, the two supporting rods (11) can move closer to or away from each other, and a connecting plate (8) is further arranged in the containing bin (6), the connecting plate (8) is arranged obliquely, and the lower end of the connecting plate (8) extends to the side above the temporary storage groove (13).

3. The processing apparatus for heat exchanger production as claimed in claim 1, wherein: The side of the equipment body (1) is fixedly connected with a fixed plate (7), the containing bin (6) is fixedly connected to the fixed plate (7), one end of the lead screw (12) extends to one side of the containing bin (6), and a gear (9) is fixedly connected to the end of the lead screw (12), the punch seat (3) is fixedly connected with a fixed push piece (5), when the fixed push piece (5) moves up and down with the punch seat (3), the fixed push piece (5) can cooperate with the gear (9) to make the gear (9) rotate.

4. The processing apparatus for heat exchanger production as claimed in claim 1, wherein: The base (4) is provided with pipe pushers, and the two pipe pushers are respectively located in the temporary storage groove (13) and the processing groove (14).

5. The processing apparatus for producing a heat exchanger according to claim 4, characterized by: Two push blocks (22) are movably arranged on the inner wall of the processing groove (14), when the push plate (26) slides to one side, the push plate (26) can first cooperate with one of the push blocks (22), and then cooperate with the other push block (22), the push blocks (22) are installed on mounting seats (23), one end of a first connecting rope (19) is installed on the blocking block (17), the other end of the connecting rope (19) is connected to the mounting seat (23), and the mounting seat (23) and the base (4) are connected through a second spring (24).

6. The processing apparatus for producing a heat exchanger according to claim 5, characterized by: The pipe pushing member comprises a pressing belt (16), the temporary storage groove (13) and the machining groove (14) are both arc-shaped slot structures, and the arc of each of the slot structures is less than 180°; the pressing belt (16) is arranged on the inner wall of the slot structure, one end of the pressing belt (16) is fixedly connected with the inner wall of the slot structure, and the other end of the pressing belt (16) extends into the base (4); a winding wheel (20) capable of rotating is arranged in the base (4); the pressing belt (16) is wound around the surface of the winding wheel (20); the winding wheel (20) is connected with the base (4) through a first torsion spring (27); a connecting rod (21) is fixedly connected with the axis of the winding wheel (20); one end of a second connecting rope (25) is wound around one end of the connecting rod (21); the other end of the second connecting rope (25) is connected with the mounting base (23).

7. The processing apparatus for producing a heat exchanger according to claim 5, characterized by: The pipe pushing member comprises an air bag (32), the air bag (32) is arranged on the groove wall of the temporary storage groove (13) and the machining groove (14); one end of a pipe (33) is arranged on the air bag (32); the other end of the pipe (33) is connected into a sealed cavity (34); a sealing sheet (35) is arranged in the sealed cavity (34); the sealing sheet (35) is fixedly connected with a pushing rod (36); the pushing rod (36) is connected with the mounting base (23).

8. The processing apparatus for producing a heat exchanger according to claim 5, characterized by: The blocking block (17) is arranged on the base (4); the blocking block (17) is connected with the base (4) through a first spring (18); when the pushing plate (26) slides towards one side, the blocking block (17) can move downwards.

9. The processing apparatus for producing a heat exchanger according to claim 5, characterized by: The mounting base (23) located near the pushing plate (26) is provided with a slot; the pushing block (22) is rotatably arranged in an insertion block (29); the insertion block (29) is arranged in the slot; the insertion block (29) is provided with an inclined slot (30); an insertion tooth (31) is fixedly connected with the inner wall of the slot; the free end of the insertion tooth (31) is inserted into the inclined slot (30); a rotating shaft is fixedly connected with the pushing block (22); a second torsion spring (28) is sleeved on the rotating shaft; a right-angle slot is arranged on the insertion block (29); the rotating shaft is rotatably arranged in the right-angle slot, so that the pushing block (22) can only rotate towards one side.

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