Quality detection device for production of polyurethane safety shoes

Abstract

The invention discloses a quality detection device for production of polyurethane safety shoes, relates to the technical field of safety shoe production equipment, and aims to solve the problems that the safety shoes are deflected during detection, time and labor are wasted, the production efficiency is low, the quality of the safety shoes is detected only by bending the soles of the safety shoes at one angle, and limitation exists. The safety shoes cannot meet customer requirements or market standards. The safety shoes are straightened and fixed through the clamping plates, deflection of the safety shoes during detection is avoided, the production efficiency is improved, bending detection is conducted on the safety shoes through the detection probes and the anti-skid pieces, friction between the anti-skid pieces and the safety shoes is increased, tight contact between the anti-skid pieces and the safety shoes in the detection process is ensured, and the safety shoes are protected. The detection probe measures the bending angle and the size of a crack, and the eccentric wheel, the transmission rod and the fixed block are arranged to continuously bend the safety shoe for multiple times, so that the bending fatigue strength of the shoe sole is detected, and the detection efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of safety shoe production equipment, in particular to a quality inspection device for producing polyurethane safety shoes. Background Art

[0002] Polyurethane (PU) is a polymer resin formed by polycondensation of isocyanate and polyol. It has many advantages such as oil resistance, wear resistance, low temperature resistance, aging resistance, high hardness, and elasticity. In the field of safety shoes, polyurethane materials are widely used due to their excellent performance. It is 2-3 times more wear-resistant than ordinary rubber soles, and is light in weight and flexible. The weight is only 50%-60% of the rubber sole. The soles of polyurethane safety shoes usually adopt one-time injection molding technology. This technology can ensure the close combination between the sole and the upper, and improve the overall strength and durability of the shoes. The molding time of polyurethane soles is generally 5-7 minutes. After proper cooling and curing, it can achieve ideal physical properties.

[0003] Chinese patent document CN217407992U discloses a sole bending test device for safety shoe production, which belongs to the technical field of safety shoe production equipment. The device comprises a workbench, a cylinder is fixedly connected to the upper end of the workbench, a clamp is fixedly connected to the extended end of the cylinder, a fixed frame is fixedly connected to the upper end of the workbench, the position of the clamp corresponds to the fixed frame, a push roller is arranged at the upper end of the fixed frame, a bending mechanism is arranged on the fixed frame, the bending mechanism is connected to the push roller, the bending mechanism comprises a driving component and a reciprocating component, the driving component and the reciprocating component are both arranged on the fixed frame, the driving component and the reciprocating component are connected, and finally the sole of the safety shoe can be repeatedly bent by the reciprocating motion of the push roller, so as to test the bending degree of the sole of the safety shoe and ensure the quality of the safety shoe, but the device has limitations, the safety shoe is not fully positioned, which will cause deflection during detection, which is time-consuming and labor-intensive, and has low production efficiency, and the quality of the safety shoe is detected by bending only at one angle of the sole of the safety shoe, which has limitations, so that the safety shoe cannot meet customer requirements or market standards.

[0004] Therefore, in order to solve such problems, we proposed a quality inspection device for the production of polyurethane safety shoes. Summary of the invention

[0005] The purpose of the present invention is to provide a quality inspection device for the production of polyurethane safety shoes, aiming to solve the problem in the above-mentioned background technology that the safety shoes are not fully positioned, which will cause deflection during inspection, which is time-consuming and labor-intensive, and has low production efficiency. In addition, the quality of the safety shoes is inspected by only bending at one angle of the sole of the safety shoe, which has limitations and makes the safety shoes unable to meet customer requirements or market standards.

[0006] In order to achieve the above-mentioned purpose, the present invention provides the following technical scheme: a quality inspection device for the production of polyurethane safety shoes, including a detection structure, the detection structure includes two side plates and a supporting structure fixedly connected to the bottom of the side plates, one side of the two side plates is provided with a second slide groove, a second slider is movably connected in the second slide groove, a side of the second slider away from the side plate is fixedly connected to the supporting plate, a side block is fixedly connected to the outer wall of one side of the supporting plate, a lead screw is threadedly connected to the side block, a stepper motor is fixedly connected to the bottom of the supporting structure, the lower end of the lead screw extends through the bottom of the supporting structure and is fixedly connected to the output end of the stepper motor, the stepper motor is fixedly connected to the bottom of the supporting structure, a servo motor is fixedly connected to the top of the supporting plate, and the output of the servo motor The output end is fixedly connected with a rotating shaft, the top of the rotating shaft is fixedly connected with an eccentric wheel, the top of the eccentric wheel is fixedly connected with a first movable bolt, the first movable bolt is movably sleeved with a transmission rod, a second movable bolt is movably sleeved on a side of the transmission rod away from the first movable bolt, the bottom of the second movable bolt is fixedly connected with a fixed block, the top of the fixed block is fixedly connected with a detection probe, the side wall of the fixed block is fixedly connected with an anti-slip part, the bottom of the fixed block is fixedly connected with a third slider, the third slider limits the movement trajectory of the fixed block, the bottom of the fixed block is provided with a fixed plate, the bottom of the fixed plate is fixedly connected to the top of the support plate, the top of the fixed plate is provided with a third sliding groove, the third sliding groove is fixedly connected with a limiting rod, and the outer wall of the limiting rod is sleeved with a reset spring.

[0007] Preferably, one side of the side panel is provided with a clamping structure, the clamping structure includes an L-shaped piece fixedly connected to one side of the side panel, a pad is fixedly connected to the side of the L-shaped piece away from the side panel, a cylinder is fixedly connected to the top of the pad, a push rod is fixedly connected to the output end of the cylinder, a support plate is fixedly connected to the side of the push rod away from the cylinder, a first slide groove is provided on the side of the support plate away from the push rod, a double-threaded rod is connected through the support plate, the double-threaded rod is located in the first slide groove, a handle is fixedly connected to one side of the double-threaded rod, two first sliders are threadedly connected to the double-threaded rod, a clamp is fixedly connected to one side of the two first sliders, and the two first sliders are slidably connected to the first slide groove.

[0008] Preferably, a conveying structure is provided on one side of the L-shaped member, and the conveying structure includes a first fixing member fixedly connected to the top of the base plate, one side of the first fixing member is fixedly connected to a driving motor, the output end of the driving motor is fixedly connected to a main rotating rod, an active pulley is fixedly connected to the main rotating rod, a conveyor belt is movably sleeved on the active pulley, a driven pulley is movably sleeved on the side of the conveyor belt away from the active pulley, the driven pulley is fixedly connected to a secondary rotating rod, both ends of the secondary rotating rod are movably connected to second fixing members, and the second fixing member is fixedly connected to the top of the base plate.

[0009] Preferably, the supporting structure includes a base plate fixedly connected to the bottom of the side plate, a stepper motor is arranged at the bottom of the base plate, the lower end of the screw rod movably passes through the base plate, the bottom of the base plate is fixedly connected to a support leg, and the top of the base plate is fixedly connected to a display controller.

[0010] Preferably, the third sliding block is located in the third sliding groove, and the fixed block and the fixed plate are slidably connected to the third sliding groove via the third sliding block.

[0011] Preferably, an upper telescopic baffle is fixedly connected to the top of the clamping plate, a side telescopic baffle is fixedly connected to the outer wall of the clamping plate, and the upper telescopic baffle and the side telescopic baffle are fixedly connected to the two clamping plates respectively.

[0012] Preferably, the two first sliding blocks are located in the first sliding groove, and the maximum distance between the two first sliding blocks is equal to the length of the first sliding groove.

[0013] Preferably, three second sliding grooves are opened on the side wall of the side plate, the second sliding grooves are evenly located on the side wall of the side plate, and the second sliding block is slidably connected to the inner wall of the second sliding groove.

[0014] Preferably, the length of the limiting rod is the same as that of the third sliding groove, the outside of the limiting rod is sleeved with the third sliding block, the reset spring is fixedly connected to the third sliding block, and the reset spring resets the third sliding block.

[0015] Preferably, the lengths of the upper telescopic baffle and the side telescopic baffle are extended and retracted as the clamping plate moves, so as to limit the top and sides of the safety shoes.

[0016] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides a quality inspection device for the production of polyurethane safety shoes. The device is provided with a splint, which is used to realize the alignment and fixation of the safety shoes, thereby avoiding the deflection of the safety shoes during inspection and improving the production efficiency. Secondly, the safety shoes are inspected for bending by using a detection probe and an anti-skid part. The anti-skid part increases the friction between the safety shoes and the safety shoes, thereby ensuring close contact between the two during the inspection process. The detection probe measures the bending angle and the size of the crack. The eccentric wheel, the transmission rod and the fixed block are provided to continuously bend the safety shoes for multiple times, thereby detecting the bending fatigue strength of the soles and improving the inspection efficiency. Secondly, an active pulley, a conveyor belt and a driven pulley are provided, and the conveyor belt transports and collects the safety shoes after inspection. Secondly, a reset spring and a limit rod are provided, and the elastic force of the reset spring itself is used to realize buffered sliding of the third slider, thereby increasing the flexibility and versatility of the equipment, facilitating later maintenance and replacement, and reducing maintenance time and cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a three-dimensional schematic diagram of a quality inspection device for producing polyurethane safety shoes of the present invention; Figure 2 It is a three-dimensional exploded view of a quality inspection device for the production of polyurethane safety shoes of the present invention; Figure 3 It is a three-dimensional exploded schematic diagram of a detection structure in a quality detection device for polyurethane safety shoes production of the present invention; Figure 4 It is a three-dimensional exploded schematic diagram of a detection component in a quality detection device for producing polyurethane safety shoes of the present invention; Figure 5 It is a three-dimensional exploded schematic diagram of a clamping structure in a quality inspection device for polyurethane safety shoes production of the present invention; Figure 6 It is a three-dimensional exploded schematic diagram of a conveying structure in a quality inspection device for producing polyurethane safety shoes of the present invention; Figure 7 The present invention is a three-dimensional exploded schematic diagram of a fixing plate in a quality inspection device for producing polyurethane safety shoes.

[0018] Legend: 1. Clamping structure; 11. L-shaped member; 111. Pad; 112. Cylinder; 113. Push rod; 12. Support plate; 121. First slide groove; 122. Double threaded rod; 123. Handle; 13. First slider; 131. Clamp plate; 132. Upper telescopic baffle; 133. Side telescopic baffle; 2. Detection structure; 21. Side plate; 211. Second slide groove; 22. Second slider; 221. Support plate; 222. Side block; 23. Screw; 231. Stepping motor; 24. Bracket; 241. Servo motor; 242. Rotating shaft; 25. Eccentric wheel; 251 , first movable bolt; 252, transmission rod; 253, second movable bolt; 26, fixed block; 261, detection probe; 262, anti-slip member; 263, third slider; 27, fixed plate; 271, third slide groove; 28, limit rod; 281, reset spring; 3, conveying structure; 31, first fixed part; 311, driving motor; 312, main rotating rod; 32, active pulley; 33, conveyor belt; 34, driven pulley; 341, auxiliary rotating rod; 342, second fixed part; 4, supporting structure; 41, bottom plate; 42, support leg; 43, display controller. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0020] In order to solve the problem that the safety shoes are not fully positioned, which will lead to deflection during testing, time-consuming and labor-intensive, low production efficiency, and only through the bending of one angle of the safety shoe sole to test the quality of the safety shoes, there are limitations, making the safety shoes unable to meet customer requirements or market standards, please refer to Figure 1-Figure 6 , providing the following preferred technical solutions.

[0021] An embodiment of the present invention is a quality inspection device for the production of polyurethane safety shoes, comprising a detection structure 2, the detection structure 2 comprising two side panels 21 and a support structure 4 fixedly connected to the bottom of the side panels 21, a second slide groove 211 is provided on one side of the two side panels 21, a second slider 22 is movably connected in the second slide groove 211, a side of the second slider 22 away from the side panel 21 is fixedly connected to a support plate 221, a side block 222 is fixedly connected to an outer wall of one side of the support plate 221, a screw rod 23 is threadedly connected to the side block 222, a stepper motor 231 is fixedly connected to the bottom of the support structure 4, the lower end of the screw rod 23 extends through the bottom of the support structure 4 and is fixedly connected to the output end of the stepper motor 231, the stepper motor 231 is fixedly connected to the bottom of the support structure 4, a servo motor 241 is fixedly connected to the top of the support plate 221, and a rotating shaft 242 is fixedly connected to the output end of the servo motor 241, An eccentric wheel 25 is fixedly connected to the top of the rotating shaft 242, and a first movable bolt 251 is fixedly connected to the top of the eccentric wheel 25. A transmission rod 252 is movably sleeved on the first movable bolt 251, and a second movable bolt 253 is movably sleeved on the side of the transmission rod 252 away from the first movable bolt 251. A fixed block 26 is fixedly connected to the bottom of the second movable bolt 253, and a detection probe 261 is fixedly connected to the top of the fixed block 26. An anti-slip member 262 is fixedly connected to the side wall of the fixed block 26, and a third slider 263 is fixedly connected to the bottom of the fixed block 26. The third slider 263 limits the movement trajectory of the fixed block 26. A fixed plate 27 is provided at the bottom of the fixed block 26, and the bottom of the fixed plate 27 is fixedly connected to the top of the support plate 221. A third sliding groove 271 is provided on the top of the fixed plate 27, and a limiting rod 28 is fixedly connected in the third sliding groove 271. A return spring 281 is sleeved on the outer wall of the limiting rod 28.

[0022] Specifically, the stepper motor 231 drives the screw rod 23 to rotate, so that the screw rod 23 drives the support plate 221 to rise and fall, and then the support plate 221 drives the bracket 24 and the fixed plate 27 to rise and fall, so as to measure the safety shoes at different heights, and then the servo motor 241 is started, and the servo motor 241 drives the rotating shaft 242 to rotate, and the rotating shaft 242 drives the eccentric wheel 25 to rotate, and the eccentric wheel 25 drives the fixed block 26 to move horizontally through the first movable bolt 251, the transmission rod 252 and the second movable bolt 253, and the fixed block 26 drives the detection probe 261 and the anti-slip part 262 to move horizontally, ensuring that the anti-slip part 262 is in close contact with the safety shoes during the detection process, and the detection probe 261 measures the bending angle and the size of the crack.

[0023] A clamping structure 1 is provided on one side of the side plate 21, and the clamping structure 1 includes an L-shaped member 11 fixedly connected to one side of the side plate 21, a cushion block 111 is fixedly connected to the side of the L-shaped member 11 away from the side plate 21, a cylinder 112 is fixedly connected to the top of the cushion block 111, a push rod 113 is fixedly connected to the output end of the cylinder 112, a support plate 12 is fixedly connected to the side of the push rod 113 away from the cylinder 112, a first slide groove 121 is provided on the side of the support plate 12 away from the push rod 113, a double-threaded rod 122 is penetrated and connected to the support plate 12, the double-threaded rod 122 is located in the first slide groove 121, a handle 123 is fixedly connected to one side of the double-threaded rod 122, two first sliders 13 are threadedly connected to the double-threaded rod 122, a clamping plate 131 is fixedly connected to one side of the two first sliders 13, and the two first sliders 13 are slidably connected to the first slide groove 121.

[0024] A conveying structure 3 is provided on one side of the L-shaped member 11, and the conveying structure 3 includes a first fixing member 31 fixedly connected to the top of the bottom plate 41, one side of the first fixing member 31 is fixedly connected to a driving motor 311, the output end of the driving motor 311 is fixedly connected to a main rotating rod 312, an active pulley 32 is fixedly connected to the main rotating rod 312, a conveyor belt 33 is movably sleeved on the active pulley 32, a driven pulley 34 is movably sleeved on the side of the conveyor belt 33 away from the active pulley 32, a secondary rotating rod 341 is fixedly connected to the driven pulley 34, and both ends of the secondary rotating rod 341 are movably connected to a second fixing member 342, the bottoms of the first fixing member 31 and the second fixing member 342 are fixedly connected to the top of the bottom plate 41, and the first fixing member 31 and the second fixing member 342 are symmetrical about the L-shaped member 11.

[0025] Specifically, the push rod 113 is driven by the cylinder 112, and the push rod 113 drives the support plate 12 to move horizontally, so that the support plate 12 adjusts the horizontal position of the clamping plate 131 through the push rod 113, thereby improving the position fixation of the safety shoes. The bottom of the L-shaped member 11 is located in the middle of the conveyor belt 33, and the conveyor belt 33 is used to transport the safety shoes after the inspection. When the inspection is completed, manual operation causes the two clamping plates 131 to move in opposite directions, and the safety shoes will fall to the top of the conveyor belt 33 for manual removal.

[0026] The support structure 4 includes a bottom plate 41 fixedly connected to the bottom of the side plate 21, a stepper motor 231 is arranged at the bottom of the bottom plate 41, the lower end of the screw rod 23 movably passes through the bottom plate 41, a support leg 42 is fixedly connected to the bottom of the bottom plate 41, and a display controller 43 is fixedly connected to the top of the bottom plate 41.

[0027] Specifically, the entire device is fixedly supported by the legs 42 to improve the stability of the structure, and the display controller 43 is used to control the cylinder 112, the stepper motor 231, the servo motor 241 and the drive motor 311 to ensure the normal operation of the entire device.

[0028] The third sliding block 263 is located in the third sliding groove 271 , and the fixing block 26 and the fixing plate 27 are slidably connected with the third sliding groove 271 via the third sliding block 263 .

[0029] Furthermore, in order to enhance the stability of the device and reduce the workload of workers, such as Figure 5-Figure 7 As shown, the following preferred technical solutions are provided.

[0030] An upper telescopic baffle 132 is fixedly connected to the top of the clamping plate 131 , and a side telescopic baffle 133 is fixedly connected to the outer wall of the clamping plate 131 . The upper telescopic baffle 132 and the side telescopic baffle 133 are fixedly connected to the two clamping plates 131 , respectively.

[0031] Specifically, the top of the safety shoe is limited by the upper telescopic baffle 132, and the side of the safety shoe is limited by the side telescopic baffle 133, so as to prevent the safety shoe from deflecting during the detection work, resulting in data errors.

[0032] The two first sliding blocks 13 are located in the first sliding groove 121 , and the maximum distance between the two first sliding blocks 13 is equal to the length of the first sliding groove 121 .

[0033] Three second sliding grooves 211 are formed on the side wall of the side plate 21 . The second sliding grooves 211 are evenly located on the side wall of the side plate 21 , and the second sliding blocks 22 are slidably connected to the inner walls of the second sliding grooves 211 .

[0034] The length of the limiting rod 28 is the same as that of the third sliding groove 271 . The outside of the limiting rod 28 is sleeved with the third slider 263 . The reset spring 281 is fixedly connected to the third slider 263 . The reset spring 281 resets the third slider 263 .

[0035] The lengths of the upper telescopic baffle 132 and the side telescopic baffle 133 are extended and retracted as the clamping plate 131 moves, so as to limit the top and side of the safety shoe.

[0036] Working principle: first, place the safety shoe between the two clamping plates 131, then manually twist the handle 123, the handle 123 drives the double threaded rod 122 to rotate, the double threaded rod 122 drives the two first sliders 13 and the two clamping plates 131 to make horizontal relative movement, thereby clamping the safety shoe, then start the cylinder 112, the cylinder 112 drives the push rod 113, the push rod 113 pushes the support plate 12 to make horizontal movement until the safety shoe fits the anti-slip part 262, then start the stepper motor 231, the stepper motor 231 drives the screw rod 23 to rotate, so that the screw rod 23 drives the support plate 221 to move up and down, thereby supporting the safety shoe. The support plate 221 drives the bracket 24 and the fixed plate 27 to rise and fall, and detects the safety shoes at different heights. Then the servo motor 241 is started, and the servo motor 241 drives the rotating shaft 242 to rotate. The rotating shaft 242 drives the eccentric wheel 25 to rotate. The eccentric wheel 25 drives the fixed block 26 to move horizontally through the first movable bolt 251, the transmission rod 252 and the second movable bolt 253. The fixed block 26 drives the detection probe 261 and the anti-slip part 262 to move horizontally to ensure that the anti-slip part 262 is in close contact with the safety shoes during the detection process. The detection probe 261 measures the bending angle and the size of the crack.

[0037] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0038] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A quality inspection device for the production of polyurethane safety shoes, comprising a detection structure (2), characterized in that: The detection structure (2) comprises two side plates (21) and a support structure (4) fixedly connected to the bottom of the side plates (21); a second slide groove (211) is provided on one side of each of the two side plates (21); a second slider (22) is movably connected in the second slide groove (211); a side of the second slider (22) away from the side plate (21) is fixedly connected to a support plate (221); a side block (222) is fixedly connected to an outer wall of one side of the support plate (221); a screw rod (23) is threadedly connected to the side block (222). The bottom of the support structure (4) is fixedly connected to a stepper motor (231), the lower end of the lead screw (23) extends through the bottom of the support structure (4) and is fixedly connected to the output end of the stepper motor (231), the stepper motor (231) is fixedly connected to the bottom of the support structure (4), the top of the support plate (221) is fixedly connected to a servo motor (241), the output end of the servo motor (241) is fixedly connected to a rotating shaft (242), and the top of the rotating shaft (242) is fixedly connected to an eccentric wheel (2 5), the top of the eccentric wheel (25) is fixedly connected to a first movable bolt (251), a transmission rod (252) is movably sleeved on the first movable bolt (251), a second movable bolt (253) is movably sleeved on a side of the transmission rod (252) away from the first movable bolt (251), the bottom of the second movable bolt (253) is fixedly connected to a fixed block (26), the top of the fixed block (26) is fixedly connected to a detection probe (261), and a side wall of the fixed block (26) is fixedly connected to an anti-slip member (262), A third sliding block (263) is fixedly connected to the bottom of the fixed block (26), and the third sliding block (263) limits the movement trajectory of the fixed block (26). A fixing plate (27) is provided at the bottom of the fixed block (26), and the bottom of the fixing plate (27) is fixedly connected to the top of the support plate (221). A third sliding groove (271) is provided at the top of the fixing plate (27), and a limiting rod (28) is fixedly connected in the third sliding groove (271). A return spring (281) is sleeved on the outer wall of the limiting rod (28).

2. A quality inspection device for polyurethane safety shoes production according to claim 1, characterized in that: A clamping structure (1) is provided on one side of the side plate (21), the clamping structure (1) comprising an L-shaped member (11) fixedly connected to one side of the side plate (21), a cushion block (111) fixedly connected to the side of the L-shaped member (11) away from the side plate (21), a cylinder (112) fixedly connected to the top of the cushion block (111), a push rod (113) fixedly connected to the output end of the cylinder (112), a support plate (12) fixedly connected to the side of the push rod (113) away from the cylinder (112), and the support plate (12) away from the side plate A first slide groove (121) is provided on one side of the push rod (113); a double threaded rod (122) is connected through the support plate (12); the double threaded rod (122) is located in the first slide groove (121); a handle (123) is fixedly connected to one side of the double threaded rod (122); two first sliders (13) are threadedly connected to the double threaded rod (122); a clamping plate (131) is fixedly connected to one side of the two first sliders (13); and the two first sliders (13) are slidably connected to the first slide groove (121).

3. A quality inspection device for polyurethane safety shoes production according to claim 2, characterized in that: A conveying structure (3) is provided on one side of the L-shaped member (11), the conveying structure (3) comprising a first fixing member (31) fixedly connected to the top of the bottom plate (41), one side of the first fixing member (31) being fixedly connected to a driving motor (311), an output end of the driving motor (311) being fixedly connected to a main rotating rod (312), a driving pulley (32) being fixedly connected to the main rotating rod (312), a conveyor belt (33) being movably sleeved on the driving pulley (32), a driven pulley (34) being movably sleeved on a side of the conveyor belt (33) away from the driving pulley (32), a secondary rotating rod (341) being fixedly connected to the driven pulley (34), two ends of the secondary rotating rod (341) being movably connected to second fixing members (342), and the second fixing member (342) being fixedly connected to the top of the bottom plate (41).

4. A quality inspection device for polyurethane safety shoes production according to claim 1, characterized in that: The support structure (4) comprises a bottom plate (41) fixedly connected to the bottom of the side plate (21), a stepping motor (231) is arranged at the bottom of the bottom plate (41), the lower end of the screw rod (23) movably penetrates the bottom plate (41), the bottom of the bottom plate (41) is fixedly connected to a support leg (42), and the top of the bottom plate (41) is fixedly connected to a display controller (43).

5. The quality inspection device for polyurethane safety shoes production according to claim 1, characterized in that: The third sliding block (263) is located in the third sliding groove (271), and the fixed block (26) and the fixed plate (27) are slidably connected to the third sliding groove (271) via the third sliding block (263).

6. A quality inspection device for polyurethane safety shoes production according to claim 2, characterized in that: An upper telescopic baffle (132) is fixedly connected to the top of the clamping plate (131), a side telescopic baffle (133) is fixedly connected to the outer wall of the clamping plate (131), and the upper telescopic baffle (132) and the side telescopic baffle (133) are respectively fixedly connected to the two clamping plates (131).

7. A quality inspection device for polyurethane safety shoes production according to claim 2, characterized in that: The two first sliding blocks (13) are located in the first sliding groove (121), and the maximum distance between the two first sliding blocks (13) is equal to the length of the first sliding groove (121).

8. A quality inspection device for polyurethane safety shoes production according to claim 1, characterized in that: The number of second sliding grooves (211) opened on the side walls of the two side plates (21) is three.

9. A quality inspection device for polyurethane safety shoes production according to claim 1, characterized in that: The length of the limiting rod (28) is the same as that of the third sliding groove (271); the outside of the limiting rod (28) is sleeved with the third sliding block (263); the return spring (281) is fixedly connected to the third sliding block (263); and the return spring (281) returns the third sliding block (263).

10. A quality inspection device for polyurethane safety shoes production according to claim 6, characterized in that: The lengths of the upper telescopic baffle (132) and the side telescopic baffle (133) are extended and retracted as the clamp moves, so as to limit the top and side of the safety shoe.

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