A shoe upper spray humidifying shaping structure

Abstract

This invention discloses a shoe upper spray humidification and shaping structure, including a worktable, a fixed frame on the surface of the worktable, a crossbar fixedly connected between the front and rear inner sidewalls of the fixed frame, and a sensing component on the surface of the fixed frame, including a sensing frame and a support frame, used to sense the undulations of the shoe upper and adjust the nozzle height. By setting the sensing component, when the shoe upper to be processed moves laterally along the placement plate past the fixed frame, the rollers can adaptively roll along the undulating surface of the shoe upper and drive the support frame to rise or fall synchronously. Then, the sensing frame drives the vertical bar and the adjusting frame to adjust the nozzle height, ensuring that the nozzle and the shoe upper always maintain a suitable distance, effectively avoiding the problem of localized over-wetting of the shoe upper due to excessively close spacing. At the same time, it can adapt to the processing needs of shoe uppers with different curvatures and different types, greatly improving the equipment's versatility and the uniformity of spray humidification, ensuring the basic quality of shoe upper shaping.

Description

Technical Field

[0001] This invention relates to the field of shoe processing technology, specifically to a shoe upper spray humidification and shaping structure. Background Technology

[0002] In the shoe upper processing, spray humidification and shaping is a key process to improve the fit, shaping accuracy and adaptability of the shoe upper to subsequent processing. It is widely used in the production process of various footwear such as leather shoes and sports shoes. The humidified shoe upper can better fit the shape of the shoe last, ensuring the shaping effect and the overall molding quality of the shoe.

[0003] Existing spray-on humidification and shaping structures for shoe uppers mostly use a fixed nozzle design, where the nozzle height cannot be adjusted. Different shoe models have varying degrees of curvature on their uppers, and a fixed nozzle can easily come into contact with the upper too closely, leading to over-wetting of raised areas and uneven humidification. This not only affects the fit and flatness of the shaped upper but also easily causes localized warping and deformation. Furthermore, the fixed structure cannot adapt to the processing needs of different types and designs of shoe uppers, such as athletic shoes and leather shoes, resulting in poor equipment versatility and difficulty in meeting the requirements of large-scale, multi-specification shoe upper processing and production. Therefore, a new technical solution is proposed to address this issue. Summary of the Invention

[0004] The purpose of this invention is to provide a spray-humidification and shaping structure for shoe uppers, which solves the problem that existing spray-humidification and shaping structures for shoe uppers, as mentioned in the background art, are mostly fixed nozzle designs. The nozzle height cannot be adjusted, and it is easy for the nozzle to be too close to the shoe upper or even in contact, resulting in excessive wetting of the raised parts of the shoe upper. This makes it unsuitable for the processing needs of different types and designs of shoe uppers, such as sports shoes and leather shoes.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a shoe upper spray humidification and shaping structure, including a workbench, a fixed frame provided on the surface of the workbench, a crossbar fixedly connected between the front and rear inner sidewalls of the fixed frame, and a sensing component provided on the surface of the fixed frame, the sensing component including a sensing frame and a support frame, used to sense the undulations of the shoe upper and adjust the nozzle height;

[0006] The bottom surface of the workbench is provided with a water supply frame, which is connected to an external water source through a water inlet pipe. A limiting component is provided below the water supply frame, which includes a lifting block for adjusting the amount of water sprayed during the reset process.

[0007] In this technical solution, as the shoe upper to be processed moves laterally along the placement plate and passes under the fixed frame, the rollers can adaptively roll along the undulating surface of the shoe upper and drive the support frame to rise or fall synchronously. Then, the sensor frame drives the vertical rod and the adjustment frame to adjust the nozzle height, so that the nozzle and the shoe upper always maintain an appropriate distance. This effectively avoids the problem of local over-wetting of the shoe upper caused by the distance being too close. At the same time, it can adapt to the processing needs of shoe uppers with different curvatures and different types, greatly improving the versatility of the equipment and the uniformity of spray humidification, and ensuring the basic quality of shoe upper shaping.

[0008] Preferably, five support frames are rotatably connected to the surface of the crossbar, and corresponding springs are fixedly connected between the support frames and the surface of the upper fixed frame. Rollers are rotatably connected between the bottom inner walls of the support frames, and pads are provided between the inner walls of the support frames above the rollers to support the upper sensing frame and avoid affecting the rotation of the rollers.

[0009] In practical applications, the rollers adaptively roll with the undulations of the shoe upper, driving the support frame to rotate around the crossbar and compressing or resetting the spring, thus achieving precise sensing of the shoe upper's undulations. The springs provide the resetting power to the support frame, ensuring continuous sensing. The pads support the sensing frame, preventing it from contacting the rollers and causing jamming, ensuring smooth roller rotation.

[0010] Preferably, each of the support frames is provided with a sensing frame above it. The sensing frame passes through the surface of the upper fixed frame and is slidably connected to the fixed frame. The upper end of the sensing frame is located inside the constraint frame at the top of the vertical rod.

[0011] In practical applications, the lifting and lowering of the support frame causes the sensor frame to slide vertically along the fixed frame. The constraint frame converges and transmits the movements of multiple sensor frames to the vertical rod, so that the lifting and lowering movements of the vertical rod match the height of the shoe upper, ensuring the synchronicity and accuracy of the nozzle height adjustment.

[0012] Preferably, the vertical rod passes through the surface of the fixing frame and is slidably connected to the fixing frame. An adjusting frame is fixedly connected to the bottom of the fixing frame. The lower end of the adjusting frame is connected to the nozzle, and the nozzle is connected to the lower end of the hose.

[0013] In practical applications, the vertical rod slides smoothly along the fixed frame as the induction frame moves, causing the adjustment frame and nozzle to rise and fall synchronously, achieving adaptive adjustment of the nozzle height and ensuring that the nozzle and shoe upper always maintain a suitable distance. The hose extends and retracts freely with the movement of the nozzle, ensuring continuous water flow without generating pulling resistance, ensuring continuous and stable spray humidification operation, and improving humidification uniformity.

[0014] Preferably, the water supply frame is connected to the lower end of the water pumping pipe, the upper end of the water pumping pipe is connected to all the hoses, and the water pumping pipe is connected to the water pump.

[0015] In practical applications, the water pump distributes the water source in the water delivery frame to each hose through the water pumping pipe, and finally atomizes and sprays it out through the nozzles, realizing synchronous spraying of multiple nozzles. Its stable power ensures constant spray pressure, improves the atomization effect, and makes the shoe surface more fully moisturized.

[0016] Preferably, the lifting block penetrates the bottom surface of the water supply frame and is slidably connected to the water supply frame, and a corresponding spring is fixedly connected between the bottom protrusion of the lifting block and the bottom surface of the water supply frame, and a sealing ring is provided on the inner wall of the water supply frame at the penetration point of the lifting block.

[0017] In practical applications, the lifting block slides vertically along the water supply frame, adjusting the water flow rate by changing the flow cross-section. A spring provides automatic reset power to the lifting block, ensuring it returns to its original position without compression, thus achieving full-flow water supply. A sealing ring tightly fits the gap between the lifting block and the water supply frame, effectively preventing water leakage, ensuring stable water supply pressure, avoiding water waste, and improving the sealing and reliability of the water circuit operation.

[0018] Preferably, the surface of the workbench is provided with a first sliding groove, and a placement plate is slidably connected to the surface of the first sliding groove. An electric push rod is fixedly connected to the outer side wall of the workbench. The telescopic end of the electric push rod passes through the side wall of the workbench and is fixedly connected to the placement plate. The surface of the placement plate is provided with two sets of second sliding grooves, and a clamping plate is slidably connected to the surface of the second sliding groove. A corresponding spring is fixedly connected between the clamping plate and the inner side wall of the second sliding groove.

[0019] In practical applications, the electric actuator drives the placement plate to move smoothly laterally along the first slide, providing stable power for the movement and humidification of the shoe upper. The first slide restricts the movement path of the placement plate to prevent deviation. The clamping plate slides along the second slide to clamp the shoe and prevent it from slipping during movement.

[0020] Preferably, a movable seat is fixedly connected to the bottom of the placement plate, the surface of the movable seat is provided with a movable groove, a pressing block is slidably connected to the surface of the movable groove, and a corresponding spring is fixedly connected between the pressing block and the inner sidewall of the movable groove.

[0021] In practical applications, the placement plate drives the moving seat and the extrusion block to move synchronously, allowing the extrusion block to contact the lifting block, thereby achieving flow regulation; the movable groove provides sliding space for the extrusion block.

[0022] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0023] 1. This invention, by setting up a sensing component, allows the rollers to adaptively roll along the undulating surface of the shoe upper as it moves laterally with the placement plate past the fixed frame. This, in turn, drives the support frame to rise or fall synchronously. The sensing frame then drives the vertical rod and adjustment frame to adjust the nozzle height, ensuring that the nozzle and shoe upper maintain a suitable distance. This effectively avoids the problem of localized over-wetting of the shoe upper due to excessively close spacing. At the same time, it can adapt to the processing needs of shoe uppers with different curvatures and different types, greatly improving the versatility of the equipment and the uniformity of spray humidification, and ensuring the basic quality of shoe upper shaping.

[0024] 2. This invention, by setting a limiting component, ensures that when the placement plate, carrying the shoe, moves towards the fixed frame, the nozzle operates at full flow. The extrusion block, passing the inclined side wall of the lifting block, is pushed to one side. When the placement plate needs to be reset, the side of the extrusion block disengages from the lifting block and returns to the other side of the movable groove. At this point, it contacts the rounded corner area at the bottom edge of the lifting block, pushing the lifting block upward. This reduces the flow cross-section inside the water delivery frame, achieving mechanical adjustment of the water spray volume. This allows the nozzle to automatically reduce mist, preventing excessive water spraying onto the shoe surface during the reciprocating operation of the equipment. This effectively prevents the shoe surface from softening and deforming due to excessive moisture, while also reducing water consumption and improving shaping stability. Attached Figure Description

[0025] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0026] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0027] Figure 2 This is a schematic diagram of the bottom structure of the present invention;

[0028] Figure 3 This is a cross-sectional structural diagram of the present invention;

[0029] Figure 4 This is a schematic diagram of the induction frame structure of the present invention;

[0030] Figure 5 This is a schematic diagram of the extrusion block structure of the present invention;

[0031] Figure 6 This is a schematic diagram of the internal structure of the water conveying frame of the present invention;

[0032] Figure 7 This is a schematic diagram of the lifting block structure of the present invention.

[0033] In the diagram: 1. Workbench; 101. No. 1 chute; 2. Placement plate; 201. No. 2 chute; 202. Clamping plate; 3. Electric actuator; 4. Fixing frame; 401. Horizontal bar; 5. Support frame; 501. Roller; 502. Pad; 6. Induction frame; 7. Vertical bar; 701. Constraint frame; 8. Adjustment frame; 9. Hose; 901. Nozzle; 10. Water suction pipe; 11. Water pump; 12. Water delivery frame; 121. Water inlet pipe; 13. Lifting block; 14. Moving seat; 141. Movable groove; 15. Extrusion block. Detailed Implementation

[0034] To make the technical means, creative features, objectives and effects of the present invention easier to understand, the following detailed description is provided in conjunction with specific embodiments.

[0035] A shoe upper spray-on humidification and shaping structure, see [link / reference] Figures 1 to 7 The system includes a workbench 1, a fixed frame 4 on the surface of the workbench 1, a crossbar 401 fixedly connected between the front and rear inner walls of the fixed frame 4, a sensing component on the surface of the fixed frame 4, the sensing component including a sensing frame 6 and a support frame 5, used to sense the undulation of the shoe upper and adjust the height of the nozzle 901, five support frames 5 are rotatably connected to the surface of the crossbar 401, each support frame 5 can only rotate and cannot move laterally; a corresponding spring is fixedly connected between the support frame 5 and the surface of the fixed frame 4 above, a roller 501 is rotatably connected between the bottom inner walls of the support frame 5, and a pad 502 is provided between the inner walls of the support frame 5 above the roller 501 to support the sensing frame 6 above and avoid affecting the rotation of the roller 501.

[0036] In the above technical solution, when the shoe upper to be processed is placed on the placement plate 2 and moves laterally under the fixed frame 4, the roller 501 will roll adaptively to fit the undulating surface of the shoe upper. The raised parts of the shoe upper will push the roller 501 upward, causing the support frame 5 to rotate around the crossbar 401. The spring of the support frame 5 is compressed and lifted upward in sync, while pushing the induction frame 6 to slide vertically along the fixed frame 4. Finally, the lifting and lowering of the induction frame 6 drives the subsequent components to adjust the height of the nozzle 901, so that the nozzle 901 always maintains an appropriate distance with the shoe upper with different undulations, effectively avoiding local over-wetting of the shoe upper due to too close a distance. At the same time, it can adapt to the processing needs of shoe uppers with different curvatures and different types, such as sports shoes and leather shoes, greatly improving the uniformity of spray humidification and the versatility of the equipment, laying a good foundation for the shaping of the shoe upper.

[0037] Specifically, such as Figure 3 and Figure 4As shown, each support frame 5 is equipped with a sensor frame 6 above it. The sensor frame 6 passes through the surface of the fixed frame 4 above and is slidably connected to the fixed frame 4. The upper end of the sensor frame 6 is located inside the constraint frame 701 at the top of the vertical rod 7. When the support frame 5 is raised or lowered by the roller 501, it will synchronously drive the corresponding sensor frame 6 to slide vertically along the fixed frame 4. The upper end of the sensor frame 6 is inside the constraint frame 701 at the top of the vertical rod 7. The raising and lowering actions of multiple sets of sensor frames 6 can be synchronously transmitted to the vertical rod 7, realizing the adaptive raising and lowering of the vertical rod 7 with the overall undulation of the shoe upper.

[0038] In one optional embodiment, the vertical rod 7 passes through the surface of the fixing frame 4 and is slidably connected to the fixing frame 4. An adjusting frame 8 is fixedly connected to the bottom of the fixing frame 4. The lower end of the adjusting frame 8 is connected to the nozzle 901. The nozzle 901 is connected to the lower end of the hose 9. The water delivery frame 12 is connected to the lower end of the water pumping pipe 10. The upper end of the water pumping pipe 10 is connected to all the hoses 9, and the water pumping pipe 10 is connected to the water pump 11.

[0039] In the above technical solution, when the sensing frame 6 drives the constraint frame 701 to rise and fall, it will simultaneously pull the vertical rod 7 to slide vertically along the fixed frame 4. The rise and fall of the vertical rod 7 will directly drive the bottom adjustment frame 8 and the nozzle 901 to move up and down synchronously, so as to achieve precise adjustment of the height of the nozzle 901. The water pump 11 introduces the water source in the water delivery frame 12 into each hose 9 through the water pumping pipe 10, and finally sprays it out by the nozzle 901 to humidify the shoe surface. The hose 9 has good flexibility and can freely extend and deform with the height adjustment of the nozzle 901, without pulling or hindering the movement of the nozzle 901. At the same time, it can ensure the continuous connection of the water path and ensure the continuity and stability of the spray humidification operation.

[0040] It's worth noting that the adjustment frame 8 has a multi-section structure, with each section connected by a damping pivot. This allows operators to manually adjust the bending angle and height of each section of the adjustment frame 8 according to the processing requirements of the shoe upper and the spray angle requirements of different shoe models, thereby flexibly changing the spray angle of the nozzle 901. The damping pivot here is an industrial-grade torque damping structure with built-in damping pads that provide stable damping torque. For example, the damping pivot of a monitor stand in an office can be easily adjusted when external force is applied, and can be locked in position immediately after the external force is removed, without loosening or shifting. In this application, operators can flexibly bend each section of the adjustment frame 8 according to the spraying requirements of the shoe upper. After adjustment, the pivot can firmly maintain the set angle and height, and will not shift due to external forces such as equipment vibration or hose 9 pulling, ensuring the stability of the spray angle of the nozzle 901 and guaranteeing the accuracy and uniformity of shoe upper humidification.

[0041] In one optional embodiment, a water supply frame 12 is provided on the bottom surface of the workbench 1. The water supply frame 12 is connected to an external water source through a water inlet pipe 121. A limiting component is provided below the water supply frame 12. The limiting component includes a lifting block 13, which is used to adjust the amount of water sprayed during the reset process. The lifting block 13 passes through the bottom surface of the water supply frame 12 and is slidably connected to the water supply frame 12. A corresponding spring is fixedly connected between the bottom protrusion of the lifting block 13 and the bottom surface of the water supply frame 12. A sealing ring is provided on the inner wall of the water supply frame 12 at the point where the lifting block 13 passes through.

[0042] In the above technical solution, when the placement plate 2 moves the shoe upper towards the fixed frame 4 for humidification, the squeezing block 15 at the bottom of the moving seat 14 slides along the inclined surface of the side wall of the lifting block 13. The squeezing block 15 retracts towards the inside of the movable groove 141 under the thrust of the inclined surface, and the lifting block 13 remains in place under the support of the spring. At this time, the water supply frame 12 maintains a full cross-sectional flow state. The water pumped in by the water pump 11 can be delivered to the nozzle 901 through the maximum flow cross-section via the water suction pipe 10 and the hose 9. The nozzle 901 sprays at full flow to provide sufficient humidification for the shoe upper. When the placement plate 2 has basically completed the humidification, During reset, the side of the squeezing block 15 disengages from the inclined surface of the lifting block 13 and resets to the outside of the movable groove 141 under the elastic force of the spring. At this time, the squeezing block 15 will contact the rounded corner area of ​​the bottom edge of the lifting block 13 and push the lifting block 13 upward as the placement plate 2 moves. The lifting block 13 slides upward along the bottom of the water conveying frame 12, directly reducing the flow cross-section inside the water conveying frame 12, reducing the water supply, and causing the nozzle 901 to automatically reduce the spray volume, thereby realizing the mechanical adjustment of the spray volume. This effectively avoids excessive water spraying on the shoe surface during the reciprocating operation of the equipment and improves the stability of the shoe surface shaping.

[0043] Additional explanation: The full-flow spray during forward movement ensures that the shoe upper is fully and evenly humidified and softened, guaranteeing the fit and precision of subsequent shaping and preventing warping and rebound caused by insufficient humidification; the reduced spray during resetting effectively prevents softening, deformation, and delamination caused by excessive humidification of the shoe upper, while also reducing water consumption and avoiding increased drying time due to excess moisture, thus improving overall processing efficiency and ensuring the shaping quality and economic efficiency of the shoe upper.

[0044] Furthermore, such as Figure 3As shown, the surface of the workbench 1 is provided with a first slide groove 101, and a placement plate 2 is slidably connected to the surface of the first slide groove 101. An electric push rod 3 is fixedly connected to the outer side wall of the workbench 1. The telescopic end of the electric push rod 3 passes through the side wall of the workbench 1 and is fixedly connected to the placement plate 2. The surface of the placement plate 2 is provided with two sets of second slide grooves 201. A clamping plate 202 is slidably connected to the surface of the second slide groove 201. A corresponding spring is fixedly connected between the clamping plate 202 and the inner side wall of the second slide groove 201. The spring pulls the clamping plate 202 inward. The operator can lay the shoe upper to be processed flat on the surface of the placement plate 2, pull the clamping plates 202 to both sides, the clamping plates 202 slide along the second slide groove 201 and pull the spring, place the two sides of the shoe upper between the two clamping plates 202 and then release them. The clamping plates 202 clamp inward under the elastic force of the spring, realizing the rapid positioning and fixing of the shoe upper; after the electric push rod 3 is started, it can push the placement plate 2 to move smoothly laterally back and forth along the first slide groove 101, providing stable power for the movement and humidification of the shoe upper.

[0045] It is worth noting that, such as Figure 5 As shown, a movable seat 14 is fixedly connected to the bottom of the placement plate 2. The surface of the movable seat 14 is provided with a movable groove 141. A pressing block 15 is slidably connected to the surface of the movable groove 141. A corresponding spring is fixedly connected between the pressing block 15 and the inner wall of the movable groove 141. When the placement plate 2 moves, it will synchronously drive the movable seat 14 and the pressing block 15 at the bottom to move together. The movable groove 141 provides sliding space for the pressing block 15. When the pressing block 15 contacts the inclined surface and rounded corner of the lifting block 13, it can slide freely along the movable groove 141 and compress or reset the spring, realizing contact transmission with the lifting block 13.

[0046] It is worth mentioning that both the extrusion block 15 and the lifting block 13 are made of high-strength wear-resistant metal material in one piece. The material has excellent wear resistance, extrusion resistance and deformation resistance, which can effectively withstand the friction and extrusion force generated by long-term contact and sliding between the two, greatly reducing the wear rate of the components. This allows the extrusion block 15 and the lifting block 13 to maintain accurate structural dimensions and transmission effect in long-term high-frequency linkage operation, significantly extending the service life of the components and reducing the frequency of equipment maintenance and replacement costs.

[0047] In addition, all components designed in this invention are general standard parts or components known to those skilled in the art. Their structures and principles can be learned by those skilled in the art through technical manuals or conventional experimental methods. They can be fully implemented by those skilled in the art, so there is no need to elaborate. The content protected by this invention does not involve improvements to the internal structure and methods.

Claims

1. A shoe upper spray humidification and shaping structure, comprising a workbench (1), characterized in that: The surface of the workbench (1) is provided with a fixed frame (4), and a crossbar (401) is fixedly connected between the front and rear inner sidewalls of the fixed frame (4). The surface of the fixed frame (4) is provided with a sensing component, which includes a sensing frame (6) and a support frame (5) for sensing the undulation of the shoe surface and adjusting the height of the nozzle (901). The bottom surface of the workbench (1) is provided with a water supply frame (12), which is connected to an external water source through a water inlet pipe (121). A limiting component is provided below the water supply frame (12), which includes a lifting block (13) for adjusting the amount of water sprayed during the reset process.

2. The shoe upper spray humidification and shaping structure according to claim 1, characterized in that: Five support frames (5) are rotatably connected to the surface of the crossbar (401). A corresponding spring is fixedly connected between the support frame (5) and the surface of the upper fixed frame (4). A roller (501) is rotatably connected between the bottom inner sidewalls of the support frame (5). A pad (502) is provided between the inner sidewalls of the support frame (5) above the roller (501) to support the upper sensing frame (6) and avoid affecting the rotation of the roller (501).

3. The shoe upper spray humidification and shaping structure according to claim 2, characterized in that: Each of the support frames (5) is provided with a sensor frame (6) above it. The sensor frame (6) passes through the surface of the upper fixed frame (4) and is slidably connected to the fixed frame (4). The upper end of the sensor frame (6) is located inside the constraint frame (701) at the top of the vertical rod (7).

4. The shoe upper spray humidification and shaping structure according to claim 3, characterized in that: The vertical rod (7) passes through the surface of the fixed frame (4) and is slidably connected to the fixed frame (4). An adjustment frame (8) is fixedly connected to the bottom of the fixed frame (4). The lower end of the adjustment frame (8) is connected to the nozzle (901). The nozzle (901) is connected to the lower end of the hose (9).

5. The shoe upper spray humidification and shaping structure according to claim 4, characterized in that: The water delivery frame (12) is connected to the lower end of the water pumping pipe (10), the upper end of the water pumping pipe (10) is connected to all the hoses (9), and the water pumping pipe (10) is connected to the water pump (11).

6. The shoe upper spray humidification and shaping structure according to claim 1, characterized in that: The lifting block (13) penetrates the bottom surface of the water supply frame (12) and is slidably connected to the water supply frame (12). A corresponding spring is fixedly connected between the bottom protrusion of the lifting block (13) and the bottom surface of the water supply frame (12). A sealing ring is provided on the inner wall of the water supply frame (12) through which the lifting block (13) penetrates.

7. The shoe upper spray humidification and shaping structure according to claim 1, characterized in that: The surface of the workbench (1) is provided with a first slide groove (101), and a placement plate (2) is slidably connected to the surface of the first slide groove (101). An electric push rod (3) is fixedly connected to the outer wall of the workbench (1). The telescopic end of the electric push rod (3) passes through the side wall of the workbench (1) and is fixedly connected to the placement plate (2). The surface of the placement plate (2) is provided with two sets of second slide grooves (201). A clamping plate (202) is slidably connected to the surface of the second slide groove (201). A corresponding spring is fixedly connected between the clamping plate (202) and the inner side wall of the second slide groove (201).

8. The shoe upper spray humidification and shaping structure according to claim 7, characterized in that: The bottom of the placement plate (2) is fixedly connected to a movable seat (14), the surface of the movable seat (14) is provided with a movable groove (141), the surface of the movable groove (141) is slidably connected to a pressing block (15), and a corresponding spring is fixedly connected between the pressing block (15) and the inner sidewall of the movable groove (141).

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