Sole embossing forming equipment for leisure shoe production

Abstract

The invention discloses shoe sole impressing forming equipment for leisure shoe production, and belongs to the technical field of leisure shoe sole impressing, the shoe sole impressing forming equipment comprises an equipment box, the upper surface of the equipment box is provided with a working plate, the upper surface of the working plate is in bolted connection with a working frame, and the inner wall of the working frame is fixedly connected with an electric telescopic rod; the output end of the electric telescopic rod is fixedly connected with an upper mold; the upper surface of the working plate is fixedly connected with a lower mold; and a material box is fixedly connected to the inner wall of the working frame. In the using process of the shoe sole impressing forming equipment for leisure shoe production, raw materials are put into the lower mold, then the electric telescopic rod drives the upper mold to work, the impressing process is completed, at the moment, the upper mold ascends, then the stress plate and the extrusion plate ascend, and at the moment, a refrigeration solution in the material box is extruded into the cooling pipe to cool the lower mold; and the temperature in the lower mold can be conveniently and quickly reduced, so that a worker can conveniently take the shoe sole, and the working efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of casual shoe sole imprinting, in particular to a casual shoe sole imprinting and molding device. Background Art

[0002] Casual shoes are a common type of home shoes. They have good durability and wear resistance, and they also have the function of modifying the outfit. The sole is an important component of casual shoes. In the production process of casual shoes, sole embossing and molding equipment is required. After the sole is processed, it is embedded in the lower mold, which is inconvenient for the staff to take it out in time. In order to overcome this defect, the existing technology 1 (application number 202411035163.3, Chinese patent application application date 2024-07-31) is a sole embossing and molding equipment for rubber shoe processing. During use, it uses a composite mechanism design to place the sole on the top of the mold mechanism, and controls the mold mechanism to move toward the middle of the composite shell through a linear module, so as to reduce personnel touch, improve the degree of automation, improve staff safety, and reduce safety hazards. The hydraulic rod controls the lower plate to the mold The mechanism is extruded to achieve the purpose of printing and pressing the sole. The elastic structure of the spring rod achieves the effect of shock absorption and buffering, protects the equipment components, avoids excessive wear, and avoids affecting the service life of the equipment. The lower plate is connected to the upper plate by plugging. After long-term operation, the components are severely worn, which is convenient for replacement, and protects the structure. After imprinting, the mold mechanism is controlled to move outward by the linear module to take out the sole. Prior art 2 (application number 202111229949.5, Chinese patent application application date 2021-10-19) A sole imprinting equipment and imprinting method for automated production of the footwear industry. During use, it realizes automatic imprinting, coating replenishment, and feeding operations on the sole material, which greatly improves the degree of automation, improves production efficiency, and reduces labor intensity.

[0003] During the sole stamping process, high temperature is required to process the raw materials. After the processing is completed, the sole is in a high temperature state, which is inconvenient for the staff to take it in time. The sole stamping device in the above application does not have an auxiliary cooling structure during use, which will affect the subsequent operations of the staff, reduce work efficiency, and bring unnecessary trouble to the staff. Summary of the Invention

[0004] The purpose of the present invention is to provide a sole embossing and molding device for casual shoes to solve the problem raised in the above background technology that during use, it does not have an auxiliary cooling structure, which will affect the subsequent operations of the staff, reduce work efficiency, and bring unnecessary trouble to the staff.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a sole embossing and molding device for casual shoes, comprising an equipment box, wherein a working plate is provided on the upper surface of the equipment box, and a working frame is bolted to the upper surface of the working plate, and an electric telescopic rod is fixedly connected to the inner wall of the working frame, and the output end of the electric telescopic rod is fixedly connected to the upper mold; the upper surface of the working plate is fixedly connected to the lower mold; a material box is fixedly connected to the inner wall of the working frame, and a cooling pipe is fixedly connected to the side of the material box, and the interior of the working frame is connected to a force plate through a reciprocating mechanism; the interior of the lower mold is connected to a push rod through a moving mechanism, and the surface of the push rod is fixedly connected to a long tube; the upper surface of the working plate is fixedly connected to a fixed plate, and a connecting shaft is rotatably provided inside the fixed plate, and the surface of the fixed plate is connected to a movable plate through a lifting mechanism, and an airbag is bonded to the upper surface of the working plate.

[0006] Preferably, a protrusion with an inverted "U" structure is provided on the inner wall of the working frame, and the force-bearing plate is slidably provided at the protrusion position on the inner wall of the working frame. The reciprocating mechanism includes a first spring fixedly connected to the upper surface of the force-bearing plate, and the other side of the first spring is fixedly connected to the inner wall of the working frame.

[0007] Preferably, a damping rod is fixedly connected to the raised position on the inner wall of the working frame, and the movable end of the damping rod is fixedly connected to the upper surface of the force-bearing plate, and the upper surface of the force-bearing plate is connected to an extrusion plate through a long rod, the interior of the material box contains a refrigerant solution, and the upper surface of the material box is bolted to a cover plate.

[0008] Preferably, the moving mechanism includes a through hole opened inside the lower mold, the cooling pipe passes through the lower mold, and the upper surface of the portion of the cooling pipe located inside the lower mold is in contact with the lower surface of the push rod.

[0009] Preferably, the push rods are distributed on the front and rear sides of the lower mold, and a support plate is fixedly connected to the inner wall of the lower mold.

[0010] Preferably, the upper surface of the lower mold is fixedly connected to an upper connecting plate, and the front view of the upper connecting plate is an inverted "L" structure, and the lower surface of the upper connecting plate is fixedly connected to a traction rope, the other side of the traction rope is wrapped around and fixedly connected to the surface of the connecting shaft, and the surface of the connecting shaft is fixedly connected to a fan, and the fans are symmetrically distributed on both sides of the connecting shaft.

[0011] Preferably, the lifting mechanism includes a guide plate fixedly connected to the surface of the fixed plate, and the guide plate is an inverted "U" shape when viewed from the front, and the movable plate is slidably provided on the surface of the guide plate.

[0012] Preferably, a cam is fixedly connected to the surface of the connecting shaft, a second spring is fixedly connected to the lower surface of the movable plate, and the other side of the second spring is fixedly connected to the lower surface of the movable plate.

[0013] Preferably, output tubes are fixedly connected to both sides of the airbag, and an input tube is fixedly connected to the inner wall of the airbag, and one-way valves are fixedly connected to the surface of the input tube and the surface of the output tube, and the output tube is connected to the long tube through an external hose, an air guide groove is opened inside the push rod, and the end of the air guide groove forms an air outlet on the surface of the push rod, and the air outlets are distributed at equal angles on the surface of the push rod.

[0014] Preferably, a torsion spring is fixedly connected to the surface of the connecting shaft, and the other side of the torsion spring is fixedly connected to the inner wall of the fixing plate.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: the adoption of a new structural design, through the provision of a material box, a refrigeration solution and a cooling pipe, can quickly cool the lower mold after the processing is completed, and the cooling pipe bulges after being filled with liquid, which will push the push rod out of the lower mold. At this time, the lower mold plays a role in pushing the sole and assisting in material removal, making it easier for workers to take the sole. In addition, the fan is in a rotating state, which optimizes the cooling effect, and the air bag supplies air to the air guide groove through the output pipe and the long tube, so that the air guide groove blows air, which plays a role in assisting material removal. At this time, the push rod and the air guide groove cooperate to optimize the effect of assisting material removal. The specific contents are as follows: During use, the sole embossing and molding equipment for casual shoes is used to place the raw materials into the lower mold, and then the electric telescopic rod drives the upper mold to work to complete the embossing process. At this time, the upper mold rises, and then the force plate and the extrusion plate rise. At this time, the refrigerant solution inside the material box is squeezed into the cooling pipe to cool the lower mold, making it easier for the temperature inside the lower mold to drop quickly, making it easier for the staff to take the soles, and improving work efficiency.

[0016] Furthermore, when the force plate rises, the force plate will squeeze the first spring, and during the next operation, the electric telescopic rod drives the upper mold to descend. When the force plate is no longer pushed, the force plate returns to its original position under the action of the first spring. At this time, the extrusion plate moves back, and the negative pressure inside the material box will suck the refrigerant solution inside the cooling tube into the material box again, which is convenient for the next use of the refrigerant solution.

[0017] In this casual shoe sole embossing and molding equipment, after the refrigerant solution enters the cooling tube, the cooling tube is filled with liquid and expands, and the surface of the cooling tube fits with the lower surface of the push rod. At this time, the cooling tube pushes the push rod, causing it to rise. At this time, the push rod plays a role in assisting material unloading, improving the work efficiency of the staff, and the support plate plays the role of supporting the push rod.

[0018] In the sole embossing and molding equipment for casual shoes, when the upper mold rises, the upper connecting plate drives the connecting shaft to rotate inside the fixed plate through the traction rope. When the connecting shaft rotates, it drives the fan to rotate. At this time, the fan accelerates the flow of gas and also has the effect of heat dissipation. At the same time, the connecting shaft drives the cam to rotate, and then the cam will intermittently push the movable plate, so that the movable plate intermittently squeezes the airbag. At this time, the airbag supplies air to the long tube through the output pipe and the hose, so that the long tube blows air through the air guide groove and the air blow port. At this time, the air guide groove and the air blow port also play a role in assisting material unloading, and adhesion will not occur.

[0019] Furthermore, when the upper mold descends, the connecting shaft rotates under the action of the torsion spring, and the connecting shaft will reel in the traction rope to facilitate the next use of the connecting shaft, the fan and the cam. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the overall structure of the equipment box of the present invention; Figure 2 This is a schematic diagram of the connection structure between the working plate and the lower mold of the present invention; Figure 3 This is a schematic diagram of the connection structure between the material box and the cooling pipe of the present invention; Figure 4 This is a schematic diagram of the connection structure between the load-bearing plate and the extrusion plate of the present invention; Figure 5 This is a schematic structural diagram of the cutaway state of the lower mold of the present invention; Figure 6 For the present invention Figure 5 A in the middle is an enlarged structural diagram; Figure 7 This is a schematic diagram of the connection structure between the traction rope and the connecting shaft of the present invention; Figure 8 This is a schematic structural diagram of a cutaway state of a fixing plate of the present invention; Figure 9 This is a schematic diagram of the connection structure between the push rod and the long tube of the present invention; Figure 10 It is a schematic structural diagram of the push rod in a cutaway state according to the present invention.

[0021] In the figure: 1. Equipment box; 2. Working plate; 3. Working frame; 4. Electric telescopic rod; 5. Upper mold; 6. Lower mold; 7. Material box; 8. Force plate; 9. Cooling pipe; 10. First spring; 11. Damping rod; 12. Push rod; 13. Fixed plate; 14. Long tube; 15. Through hole; 16. Support plate; 17. Air guide groove; 18. Upper connecting plate; 19. Traction rope; 20. Connecting shaft; 21. Fan; 22. Torsion spring; 23. Guide plate; 24. Movable plate; 25. Second spring; 26. Airbag; 27. Output pipe; 28. Input pipe; 29. ​​Extrusion plate; 30. Cam. DETAILED DESCRIPTION

[0022] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0023] The present invention provides the following technical solution: a sole embossing and molding device for producing casual shoes.

[0024] Embodiment 1: By setting the material box 7 and the cooling pipe 9, the lower mold 6 can be quickly cooled after the stamping process is completed, so as to facilitate the molding of the workpiece. Figure 1-Figure 5 As shown, it includes an equipment box 1, a working plate 2 is provided on the upper surface of the equipment box 1, and the upper surface of the working plate 2 is bolted to the working frame 3, and the inner wall of the working frame 3 is fixedly connected to an electric telescopic rod 4, and the output end of the electric telescopic rod 4 is fixedly connected to the upper mold 5; the upper surface of the working plate 2 is fixedly connected to the lower mold 6; the inner wall of the working frame 3 is fixedly connected to a material box 7, and the side of the material box 7 is fixedly connected to a cooling pipe 9, and the interior of the working frame 3 is connected to a force plate 8 through a reciprocating mechanism; the inner wall of the working frame 3 is provided with a protrusion of an inverted "U" structure, and the protrusion position on the inner wall of the working frame 3 is slidably provided with a force plate 8, and the reciprocating mechanism includes a first spring 10 fixedly connected to the upper surface of the force plate 8, and the other side of the first spring 10 is fixedly connected to the inner wall of the working frame 3.

[0025] A damping rod 11 is fixedly connected to the raised position on the inner wall of the working frame 3, and the movable end of the damping rod 11 is fixedly connected to the upper surface of the force-bearing plate 8, and the upper surface of the force-bearing plate 8 is connected to the extrusion plate 29 through a long rod. The interior of the material box 7 contains a refrigerant solution, and the upper surface of the material box 7 is bolted to a cover plate.

[0026] like Figure 1-Figure 3 As shown, during use, the raw material is placed in the lower mold 6, and then the electric telescopic rod 4 drives the upper mold 5 to work to complete the stamping process. After the stamping is completed, the electric telescopic rod 4 drives the upper mold 5 to rise, and then the force plate 8 is pushed by the upper surface of the upper mold 5. At this time, the force plate 8 and the extrusion plate 29 rise, and the refrigerant solution in the material box 7 is squeezed into the cooling pipe 9. The cooling pipe 9 cools the lower mold 6, which facilitates the rapid reduction of the temperature inside the lower mold 6 (as shown in FIG. Figure 4As shown), it is convenient for the staff to take the soles, which improves the work efficiency. When the force plate 8 rises, the force plate 8 will squeeze the first spring 10. During the next work, the electric telescopic rod 4 drives the upper mold 5 to descend. At this time, when the force plate 8 is no longer pushed, the force plate 8 returns to its original position under the action of the first spring 10. At this time, the squeezing plate 29 moves back synchronously, and the negative pressure inside the material box 7 draws the refrigerant solution inside the cooling tube 9 into the material box 7 again, which is convenient for the next use of the refrigerant solution.

[0027] Depend on Figure 3 and Figure 4 It can be seen that a detachable cover is provided on the upper surface of the material box 7. After long-term use, the cover can be opened to replace the refrigerant solution.

[0028] Embodiment 2: The difference from embodiment 1 is that the push rod 12 is provided to achieve rapid material removal. Figure 5 and Figure 6 As shown, the interior of the lower mold 6 is connected to a push rod 12 through a moving mechanism, and a long tube 14 is fixedly connected to the surface of the push rod 12; the moving mechanism includes a through hole 15 opened inside the lower mold 6, the cooling pipe 9 passes through the lower mold 6, and the upper surface of the part of the cooling pipe 9 located inside the lower mold 6 is fitted with the lower surface of the push rod 12, the push rods 12 are distributed on the front and back sides of the lower mold 6, and a support plate 16 is fixedly connected to the inner wall of the lower mold 6.

[0029] After the refrigerant solution enters the cooling tube 9, the cooling tube 9 is filled with liquid and expanded, and the surface of the cooling tube 9 fits with the lower surface of the push rod 12. At this time, the cooling tube 9 pushes the push rod 12, causing the push rod 12 to rise inside the lower mold 6. At this time, the push rod 12 plays a role in assisting material unloading, thereby improving the work efficiency of the staff, and the support plate 16 plays a role in supporting the push rod 12.

[0030] Embodiment 3: Different from embodiment 1, the air bag 26 and the output pipe 27 can supply air to the long tube 14 and the air guide groove 17. At this time, the push rod 12, the air guide groove 17 and the air blowing port also play a role in assisting the blanking. Figure 7-10 As shown, the upper surface of the lower mold 6 is fixedly connected to an upper connecting plate 18, and the front view of the upper connecting plate 18 is an inverted "L" structure, and the lower surface of the upper connecting plate 18 is fixedly connected to a traction rope 19, and the other side of the traction rope 19 is wrapped and fixedly connected to the surface of the connecting shaft 20, and the surface of the connecting shaft 20 is fixedly connected to a fan 21, and the fans 21 are symmetrically distributed on both sides of the connecting shaft 20.

[0031] The upper surface of the working plate 2 is fixedly connected to the fixed plate 13 , and a connecting shaft 20 is rotatably provided inside the fixed plate 13 . The surface of the fixed plate 13 is connected to the movable plate 24 through a lifting mechanism, and an airbag 26 is bonded to the upper surface of the working plate 2 .

[0032] The lifting mechanism includes a guide plate 23 fixedly connected to the surface of the fixed plate 13, and the guide plate 23 is an inverted "U" shape when viewed from the front, and a movable plate 24 is slidably provided on the surface of the guide plate 23, a cam 30 is fixedly connected to the surface of the connecting shaft 20, and a second spring 25 is fixedly connected to the lower surface of the movable plate 24, and the other side of the second spring 25 is fixedly connected to the lower surface of the movable plate 24.

[0033] Output tubes 27 are fixedly connected to both sides of the airbag 26, and an input tube 28 is fixedly connected to the inner wall of the airbag 26, and the surfaces of the input tube 28 and the output tube 27 are fixedly connected to a one-way valve, and the output tube 27 is connected to the long tube 14 through an external hose. An air guide groove 17 is opened inside the push rod 12, and the end of the air guide groove 17 forms an air blowing port on the surface of the push rod 12, and the air blowing ports are distributed at equal angles on the surface of the push rod 12. A torsion spring 22 is fixedly connected to the surface of the connecting shaft 20, and the other side of the torsion spring 22 is fixedly connected to the inner wall of the fixed plate 13.

[0034] When the upper mold 5 rises, the upper connecting plate 18 drives the connecting shaft 20 to rotate inside the fixed plate 13 through the traction rope 19. When the connecting shaft 20 rotates, it drives the fan 21 to rotate (such as Figure 7 As shown), at this time, the fan 21 plays a role in accelerating the flow of gas and also plays a role in heat dissipation. At the same time, the connecting shaft 20 drives the cam 30 to rotate, and then the cam 30 will intermittently push the movable plate 24. When the movable plate 24 is pushed, the movable plate 24 slides on the surface of the guide plate 23. At this time, the second spring 25 is squeezed, and when the cam 30 continues to rotate until it does not contact the movable plate 24, the movable plate 24 returns to its original position under the action of the second spring 25. At this time, the movable plate 24 performs reciprocating linear motion in the vertical direction, that is, the movable plate 24 intermittently squeezes the airbag 26. At this time, the airbag 26 supplies air to the long tube 14 through the output pipe 27 and the hose, so that the long tube 14 blows air through the air guide groove 17 and the blowing port. At this time, the air guide groove 17 and the blowing port also play a role in assisting the blanking, and no adhesion will occur (as shown in FIG. Figure 9 and Figure 10 As shown), when the airbag 26 is not squeezed, the airbag 26 inhales air through the input tube 28. The one-way valves on the surfaces of the input tube 28 and the output tube 27 make the air flow direction from the input tube 28 to the output tube 27, and the gas backflow will not occur, thereby improving stability.

[0035] When the upper mold 5 descends, the connecting shaft 20 rotates under the action of the torsion spring 22 (as shown in FIG. Figure 8As shown), at this time, the connecting shaft 20 will reel in the traction rope 19, which is convenient for the next use of the connecting shaft 20, the fan 21 and the cam 30. When the connecting shaft 20 rotates, the long tube 14 will still be intermittently supplied with air. At this time, the air outlet is located inside the lower mold 6. At this time, the air flow is discharged through the through hole 15, and no air flow blockage will occur (as shown). Figure 6 , as shown in the enlarged figure A).

[0036] The above is the working process of the entire device, and the contents not described in detail in this specification belong to the existing technology known to professional and technical personnel in this field.

[0037] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A sole embossing and molding device for producing casual shoes, comprising an equipment box (1), wherein a working plate (2) is provided on the upper surface of the equipment box (1), a working frame (3) is bolted to the upper surface of the working plate (2), an electric telescopic rod (4) is fixedly connected to the inner wall of the working frame (3), and an upper mold (5) is fixedly connected to the output end of the electric telescopic rod (4); Its characteristics are: The upper surface of the working plate (2) is fixedly connected to a lower mold (6); A material box (7) is fixedly connected to the inner wall of the working frame (3), a cooling pipe (9) is fixedly connected to the side of the material box (7), and a force-bearing plate (8) is connected to the interior of the working frame (3) via a reciprocating mechanism; The interior of the lower mold (6) is connected to a push rod (12) via a moving mechanism, and a long tube (14) is fixedly connected to the surface of the push rod (12); The upper surface of the working plate (2) is fixedly connected to a fixed plate (13), and a connecting shaft (20) is rotatably provided inside the fixed plate (13), and the surface of the fixed plate (13) is connected to a movable plate (24) via a lifting mechanism, and an air bag (26) is bonded to the upper surface of the working plate (2).

2. The sole embossing and molding equipment for producing casual shoes according to claim 1, characterized in that: A protrusion with an inverted "U" structure is provided on the inner wall of the working frame (3), and the force-bearing plate (8) is slidably provided at the protrusion position on the inner wall of the working frame (3). The reciprocating mechanism includes a first spring (10) fixedly connected to the upper surface of the force-bearing plate (8), and the other side of the first spring (10) is fixedly connected to the inner wall of the working frame (3).

3. The sole embossing and molding equipment for producing casual shoes according to claim 1, characterized in that: A damping rod (11) is fixedly connected to a raised position on the inner wall of the working frame (3), and a movable end of the damping rod (11) is fixedly connected to the upper surface of the force-bearing plate (8), and the upper surface of the force-bearing plate (8) is connected to an extrusion plate (29) via a long rod. A refrigerant solution is contained in the material box (7), and a cover plate is bolted to the upper surface of the material box (7).

4. The sole embossing and molding equipment for casual shoes according to claim 1, characterized in that: The moving mechanism includes a through hole (15) opened inside the lower mold (6), the cooling pipe (9) passes through the lower mold (6), and the upper surface of the portion of the cooling pipe (9) located inside the lower mold (6) is in contact with the lower surface of the push rod (12).

5. The sole embossing and molding equipment for casual shoes according to claim 1, characterized in that: The push rods (12) are distributed on the front and rear sides of the lower mold (6), and a support plate (16) is fixedly connected to the inner wall of the lower mold (6).

6. The sole embossing and molding equipment for producing casual shoes according to claim 5, characterized in that: The upper surface of the lower mold (6) is fixedly connected to an upper connecting plate (18), and the front view of the upper connecting plate (18) is an inverted "L" structure, and the lower surface of the upper connecting plate (18) is fixedly connected to a traction rope (19), and the other side of the traction rope (19) is wound and fixedly connected to the surface of the connecting shaft (20), and the surface of the connecting shaft (20) is fixedly connected to a fan (21), and the fans (21) are symmetrically distributed on both sides of the connecting shaft (20).

7. The sole embossing and molding equipment for casual shoes according to claim 1, characterized in that: The lifting mechanism comprises a guide plate (23) fixedly connected to the surface of the fixed plate (13), and the guide plate (23) is in an inverted "U" shape when viewed from the front, and the movable plate (24) is slidably provided on the surface of the guide plate (23).

8. The sole embossing and molding equipment for casual shoes according to claim 1, characterized in that: A cam (30) is fixedly connected to the surface of the connecting shaft (20), a second spring (25) is fixedly connected to the lower surface of the movable plate (24), and the other side of the second spring (25) is fixedly connected to the lower surface of the movable plate (24).

9. The sole embossing and molding equipment for producing casual shoes according to claim 1, characterized in that: Output tubes (27) are fixedly connected to both sides of the airbag (26), and an input tube (28) is fixedly connected to the inner wall of the airbag (26), and one-way valves are fixedly connected to the surfaces of the input tube (28) and the output tube (27), and the output tube (27) is connected to the long tube (14) through an external hose. An air guide groove (17) is opened inside the push rod (12), and the end of the air guide groove (17) forms an air blowing port on the surface of the push rod (12), and the air blowing ports are distributed at equal angles on the surface of the push rod (12).

10. The sole embossing and molding equipment for producing casual shoes according to claim 1, characterized in that: A torsion spring (22) is fixedly connected to the surface of the connecting shaft (20), and the other side of the torsion spring (22) is fixedly connected to the inner wall of the fixing plate (13).

Images