A sole demolding treatment device for safety shoes

Abstract

The present application relates to the field of safety shoe manufacturing and injection molding equipment, and discloses a sole demolding treatment device for safety shoe manufacturing, which comprises a front mold frame and a rear mold frame, the inner side ends of the front mold frame and the rear mold frame are connected through four guide columns respectively, a front mold seat is fixedly installed at the middle part of the inner side end of the front mold frame, an injection joint is arranged at the middle part of the outer side end of the front mold frame, a fixed guide rod is fixedly installed at the inner side end of the front mold seat, the middle part of the fixed guide rod is movably installed on the four corners of the rear mold seat, a shoe mold cavity is arranged at the middle part of one end of the rear mold seat close to the front mold seat, and a cross frame is arranged at the middle part of the front mold frame and the rear mold frame. Through the design of multidirectional ejection, high-pressure gas auxiliary and adjustable thrust, the present application realizes uniform and stable demolding thrust, non-damage of the shoe mold, improves the demolding efficiency and universality, simplifies the operation, guarantees continuous production, and is suitable for the molding of safety shoe soles of multiple specifications.

Description

Technical Field

[0001] This invention relates to the field of safety shoe manufacturing and injection molding equipment, specifically to a shoe sole demolding device for safety shoe manufacturing. Background Technology

[0002] In the manufacturing of safety shoes, sole molding is one of the core processes, and the effectiveness of the demolding process directly affects the molding quality, production efficiency, and production costs. Currently, most safety shoe soles are manufactured using injection molding. This involves closing the mold, injecting molten plastic, cooling and solidifying it, and then separating the molded sole from the mold cavity. This process relies heavily on a demolding device, and the performance of this device has become a key factor restricting the large-scale production of safety shoes. As the safety shoe market continues to demand higher product quality and production efficiency, traditional demolding devices are gradually revealing numerous compatibility issues.

[0003] Traditional demolding devices for work boot soles generally suffer from unstable pushing force. Most employ a single spring-driven ejector pin structure, where the spring force fluctuates with the degree of bending, resulting in inconsistent pushing force. Insufficient pushing force causes the sole to stick to the mold cavity wall, making quick separation difficult; excessive pushing force causes sole deformation and scratches, reducing product yield. Furthermore, most devices use a unidirectional ejection design, applying force only from the front or side of the sole, which can easily lead to localized adhesion and require manual peeling, increasing labor intensity and further reducing production efficiency. In addition, traditional devices typically have a fixed pushing force, unable to be flexibly adjusted for work boot soles of different thicknesses and materials, resulting in poor adaptability. Frequent equipment adjustments are needed when changing product specifications, increasing production preparation time and operating costs.

[0004] On the other hand, traditional demolding devices lack effective auxiliary demolding and mold cavity cleaning structures. The friction between the sole and the inner wall of the mold cavity is significant during demolding, further exacerbating the difficulty. Furthermore, residual heat and small amounts of injection molded liquid debris in the mold cavity after injection molding, if not promptly removed, will affect the quality of subsequent sole molding, requiring additional time for manual cleaning and extending the production cycle. Simultaneously, some devices have unreasonable mechanical transmission structure designs, resulting in insufficient guiding accuracy during mold closing and demolding, easily leading to mold misalignment and decreased sole molding accuracy, failing to meet the stringent requirements of safety shoes for structural stability and protective performance. Therefore, developing a safety shoe sole demolding device with stable pushing force, high demolding efficiency, strong adaptability, and auxiliary mold cavity cleaning capabilities has become an urgent technical problem to be solved in the industry. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a shoe sole demolding device for the manufacture of safety shoes. This device solves the problems of unstable pushing force, low demolding efficiency, poor adaptability, and inconvenient mold cavity cleaning in traditional demolding devices, thus ensuring the quality of shoe molds and the continuity of production.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a shoe sole demolding device for manufacturing safety shoes, comprising a front mold frame and a rear mold frame, wherein the four corners of the inner ends of the front mold frame and the rear mold frame are connected by four guide pillars respectively; a front mold base is fixedly installed in the middle of the inner end of the front mold frame and an injection joint is provided in the middle of the outer end; a fixed guide rod is fixedly installed at each of the four corners of the inner end of the front mold base; the outer diameter of the middle part of the fixed guide rod is movably installed on the four corners of the rear mold base; and a shoe mold cavity is opened in the middle of the end of the rear mold base near the front mold base.

[0007] Preferably, a crossbeam is provided in the middle of the front mold frame and the rear mold frame, and a rotating frame is movably installed at both ends of the crossbeam. A first chamber is opened on both sides of the interior of the crossbeam. A spring plate is fixedly installed on both sides of the interior of the first chamber, and the ends of the spring plates extend into the interior of the rotating frame on the corresponding side. A pressure roller is fixedly installed on the inner side wall of the rotating frame, and the ends of the pressure rollers abut against the front surface of the spring plate on the corresponding side.

[0008] Preferably, two first connecting rods are movably installed on the outer side of the rotating frame near the front mold frame, and the ends of the first connecting rods are movably installed on the ends of the fixed guide rods on the corresponding sides. A second connecting rod is movably installed on the inner side of the rotating frame near the front mold frame, and a positive ejector pin is movably installed on the end of the second connecting rod. Ejector pin slots are opened on both sides of the interior of the rear mold base, and the ends of the positive ejector pins penetrate the ejector pin slots on the corresponding sides and extend into the interior of the shoe mold cavity. The cross frame is connected to the middle of the inner end of the rear mold base through two connecting frames.

[0009] Preferably, each of the first chambers has a support platform movably installed inside, and the front end of each support platform abuts against the rear surface of the spring plate on the corresponding side. Each of the first chambers has a short shaft movably installed in the middle of the inner wall, and each of the short shafts has a threaded rod fixedly installed at its outer end, with the outer diameter of the threaded rod threadedly connected to the middle of the support platform on the corresponding side.

[0010] Preferably, a second chamber is provided in the middle of the cross frame. An adjusting rod is movably installed at one end of the inner sidewall of the second chamber. The end of the adjusting rod extends to the outside of the cross frame and is fixedly installed with an internal hexagonal adjusting nut. A driving bevel gear is fixedly installed on the inner end of the adjusting rod. The inner ends of the short shafts all extend into the interior of the second chamber and are fixedly installed with driven bevel gears. The inner ends of the driven bevel gears are all meshed with the outer side of the driving bevel gears.

[0011] Preferably, a fixing ring is fixedly installed on the outer diameter of the guide post near the rear mold base, and the inner sidewall of the fixing ring is provided with inclined grooves on all four sides.

[0012] Preferably, the inner sidewall of the shoe mold cavity is provided with ejector pin grooves, and side ejector pins are movably installed in each ejector pin groove. The outer ends of the side ejector pins extend to the outside of the rear mold base and abut against the inner wall of the corresponding inclined groove. A return spring is fixedly installed on the outer diameter of each side ejector pin.

[0013] Preferably, the inner end of the positive ejector pin is connected by a connecting pipe, and a high-pressure gas inlet pipe is fixedly installed on one side of the connecting pipe. Several air outlets are opened on the outer diameter of the positive ejector pin near the shoe mold cavity.

[0014] Preferably, an electric cylinder is fixedly installed on the outer end of the rear mold frame, and the drive end of the electric cylinder extends to the inner side of the rear mold frame and is fixedly installed with a pusher.

[0015] This invention provides a demolding device for soles in the manufacture of safety shoes. It has the following beneficial effects:

[0016] 1. This invention utilizes a coordinated design of the spring plate, pressure roller, and first connecting rod. During mold closing, the pressure roller slides along the surface of the spring plate, dynamically adjusting the lever arm during the bending process of the spring plate. This compensates for the differences in spring force with the degree of bending, ensuring that the pushing force applied to the ejector pin is always uniform and stable when the spring force is released. This design not only satisfies the sufficient pushing force required for demolding but also avoids damage such as deformation and scratches to the shoe mold caused by excessive pushing force in traditional demolding devices. It is particularly suitable for products such as work shoe soles that require precise molding, ensuring the molding quality of the shoe mold.

[0017] 2. This invention employs a multi-directional ejection structure of "double positive ejector pins + four side ejector pins": the positive ejector pins exert force from the center of the shoe mold, while the side ejector pins push synchronously along the perimeter of the shoe mold, completely solving the problem of the shoe mold sticking to the mold cavity on the sides due to a single ejection method, achieving uniform detachment of the shoe mold from all directions. Simultaneously, high-pressure gas is injected through the vent during the ejection process of the positive ejector pins. On the one hand, the gas pressure further separates the shoe mold from the inner wall of the mold cavity, reducing adhesion resistance; on the other hand, the high-pressure gas can quickly remove residual heat from the mold cavity, achieving integrated cooling and cleaning, preventing residual injection liquid from affecting the next molding, and significantly improving demolding efficiency and continuous production capacity.

[0018] 3. This invention utilizes a linkage structure of an internal hexagonal adjusting nut, a bevel gear set, and a threaded rod to easily adjust the position of the support platform, thereby changing the fulcrum and force characteristics of the spring plate and achieving precise adjustment of the positive ejector pin's thrust. This design breaks through the limitations of fixed thrust in traditional demolding devices, allowing for flexible adaptation of the demolding thrust according to the different thicknesses and materials of workwear soles. This ensures smooth demolding of thick-soled and hard-soled shoes while avoiding damage to thin-soled and soft-soled shoes, significantly improving the device's versatility and adaptability, and reducing equipment adjustment costs during multi-specification production. Attached Figure Description

[0019] Figure 1 This is a perspective view of the present invention;

[0020] Figure 2 This is a schematic diagram of the structure of the rear mold base in this invention;

[0021] Figure 3 This is a schematic diagram of the crossbar structure in this invention;

[0022] Figure 4 for Figure 3 Enlarged view of point A in the middle;

[0023] Figure 5 This is a schematic diagram of the internal structure of the second chamber in this invention;

[0024] Figure 6 This is a schematic diagram of the structure of the fixed ring seat in this invention;

[0025] Figure 7 This is a schematic diagram of the connecting pipe in this invention.

[0026] The components are as follows: 1. Front mold frame; 2. Rear mold frame; 3. Guide post; 4. Front mold base; 5. Fixed guide rod; 6. Rear mold base; 7. Shoe mold cavity; 8. Horizontal frame; 9. Rotating frame; 10. First chamber; 11. Spring plate; 12. Pressure roller; 13. First connecting rod; 14. Second connecting rod; 15. Positive ejector pin; 16. Support platform; 17. Short shaft; 18. Threaded rod; 19. Second chamber; 20. Adjusting rod; 21. Hexagonal adjusting nut; 22. Driving bevel gear; 23. Driven bevel gear; 24. Fixed ring frame; 25. Inclined groove; 26. Side ejector pin; 27. Return spring; 28. Connecting frame; 29. ​​Connecting pipe; 30. High-pressure gas inlet pipe; 31. Air outlet; 32. Electric cylinder; 33. Push frame. Detailed Implementation

[0027] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] Example: Please refer to the appendix. Figure 1 -Appendix Figure 7 This invention provides a sole demolding device for manufacturing work shoes, such as... Figure 1 As shown, the device includes a front mold frame 1 and a rear mold frame 2. The front mold frame 1 and rear mold frame 2 serve as the overall support structure of the device, providing a stable mounting base for each component. The four corners of the inner ends of the front mold frame 1 and rear mold frame 2 are connected by four guide pillars 3. The guide pillars 3 provide precise guidance, ensuring the stable movement trajectory of the front mold base 4 and rear mold base 6 during mold closing and demolding, and preventing deviations that could affect the shoe mold forming accuracy. The front mold base 4 is fixedly installed in the middle of the inner end of the front mold frame 1, and an injection joint is provided in the middle of the outer end. The front mold base 4 and rear mold base 6 cooperate to form a closed shoe mold forming space. The injection joint serves as a channel for introducing the injection liquid, allowing the molten injection liquid to be precisely injected into the shoe mold cavity 7. Fixed guide rods 5 are fixedly installed at the four corners of the inner end of the mold base 4. The fixed guide rods 5 not only play an auxiliary guiding role, but also can realize the synchronous action of the ejector pins by linking the rotating frame 9 through the linkage mechanism during the mold closing and demolding process. The outer diameter of the middle part of the fixed guide rods 5 is movably installed on the four corners of the rear mold base 6, so that the rear mold base 6 can move smoothly along the axis of the fixed guide rods 5, ensuring the fitting accuracy during mold closing and the smoothness of separation during demolding. A shoe mold cavity 7 is opened in the middle of the end of the rear mold base 6 near the front mold base 4. The shape of the shoe mold cavity 7 is completely matched with the design structure of the work shoe sole. It is the core area of ​​the injection liquid cooling and molding into the sole. The smoothness of its inner wall directly affects the molding quality of the sole.

[0029] In this embodiment, a crossbeam 8 is provided in the middle of the front mold base 1 and the rear mold base 2. The crossbeam 8 is a key transmission component connecting the rear mold base 6 and the electric cylinder 32. It drives the rear mold base 6 to synchronously realize the mold closing and demolding actions through the connecting frame 28. Rotating frames 9 are movably installed at both ends of the crossbeam 8. The rotating frames 9 can rotate flexibly around the connection point with the crossbeam 8. As a force transmission medium, the force of the fixed guide rod 5 is converted into the bending force of the spring plate 11 and the moving force of the positive ejector pin 15. The crossbeam 8 has a first chamber 10 on both sides inside. The first chamber 10 provides independent installation and movement space for components such as the spring plate 11 and the support platform 16, avoiding mutual interference when the components move. The spring plate 11 is fixedly installed on both sides inside the first chamber 10 and the spring... The ends of the spring plates 11 extend into the interior of the corresponding side rotating frame 9. The spring plates 11 have good elastic deformation ability. When the mold is closed, they accumulate elastic force by bending. When the mold is demolded, they release the elastic force to provide a stable pushing force for the positive ejector pin 15. The structural design of extending into the interior of the rotating frame 9 ensures stable contact with the pressure rollers 12. Pressure rollers 12 are fixedly installed on the inner side wall of the rotating frame 9, and the ends of the pressure rollers 12 abut against the front surface of the corresponding side spring plates 11. The pressure rollers 12 can rotate around their own axis and slide along the surface of the spring plates 11 under the bending of the rotating frame 9. By changing the lever arm length, the difference in elastic force caused by the change in the degree of bending of the spring plates 11 is compensated, ensuring that the elastic force released by the spring plates 11 is always uniform and stable, thereby ensuring the consistency of the pushing force of the positive ejector pin 15.

[0030] Furthermore, two first connecting rods 13 are movably installed on the outer side of the rotating frame 9 near the front mold base 1, and the ends of the first connecting rods 13 are movably installed on the ends of the corresponding fixed guide rods 5. The first connecting rods 13 serve as transmission connectors between the rotating frame 9 and the fixed guide rods 5. When the mold is closed, the rear mold base 6 drives the cross frame 8 to move towards the front mold base 4, and the fixed guide rods 5 extend relative to the rear mold base 6. The first connecting rods 13 pull the rotating frame 9 to bend around the end of the cross frame 8, thereby accumulating elastic force. A second connecting rod 14 is movably installed on the inner side of the rotating frame 9 near the front mold base 1. The second connecting rod 14 connects the rotating frame 9 and the positive ejector pin 15, converting the bending motion of the rotating frame 9 into the linear reciprocating motion of the positive ejector pin 15. When the mold is closed, the positive ejector pin 15 is pulled back, and when the mold is demolded, the positive ejector pin 15 is pushed out. A positive ejector pin is movably installed on the end of the second connecting rod 14. 15. The positive ejector pin 15 is the core execution component for demolding the front of the shoe sole. Its end extends into the shoe mold cavity 7. During demolding, under the elastic force of the spring plate 11, the shoe sole is lifted from the middle of the mold cavity, avoiding excessive local force that could cause deformation of the shoe sole. Ejector pin slots are provided on both sides of the interior of the rear mold base 6, and the ends of the positive ejector pins 15 pass through the corresponding ejector pin slots and extend into the interior of the shoe mold cavity 7. The ejector pin slots provide a storage channel and motion guide for the positive ejector pins 15, ensuring that the positive ejector pins 15 do not deviate or jam during reciprocating motion, thus ensuring the accuracy of the ejection action. The cross frame 8 is connected to the middle of the inner end of the rear mold base 6 through two connecting frames 28. The connecting frames 28 adopt a symmetrical installation design to ensure that the power transmitted by the cross frame 8 is evenly applied to the rear mold base 6, so that the rear mold base 6 remains horizontal and stable during movement, avoiding tilting that could lead to poor mold closing or demolding obstruction.

[0031] Furthermore, each of the first chambers 10 has a movably mounted support platform 16, with the front end of each support platform 16 abutting against the rear surface of the corresponding side spring plate 11. The support platform 16 serves as the fulcrum of the spring plate 11, and its position can be adjusted by the threaded rod 18, thereby changing the force characteristics and elasticity of the spring plate 11 to adapt to the demolding requirements of shoe soles of different specifications and materials. A short shaft 17 is movably mounted in the middle of the inner wall of each of the first chambers 10. The short shaft 17 can rotate flexibly around its own axis to transmit the rotational power of the driven bevel gear 23, driving the threaded rod 18 to rotate synchronously. The sidewalls provide stable support for the short shaft 17, ensuring that it does not wobble during rotation. Threaded rods 18 are fixedly installed on the outer ends of the short shaft 17, and the outer diameter of each threaded rod 18 is threaded to the middle of the corresponding side support platform 16. The threaded connection structure between the threaded rod 18 and the support platform 16 converts rotational motion into linear motion. When the threaded rod 18 rotates, the support platform 16 moves along the axis of the first chamber 10, achieving precise adjustment of the fulcrum position of the spring plate 11. The threaded connection has a self-locking function, ensuring that the support platform 16 remains stable after position adjustment and will not shift due to vibration or other factors.

[0032] Furthermore, a second chamber 19 is provided in the middle of the cross frame 8. This second chamber 19 provides a sealed installation space for transmission components such as the driving bevel gear 22 and the driven bevel gear 23, preventing dust and residual injection molding fluid from affecting the flexibility and service life of the gear transmission. An adjusting rod 20 is movably installed on one end of the inner wall of the second chamber 19. The adjusting rod 20 can rotate around its own axis. One end is connected to an internal hexagonal adjusting nut 21, and the other end is connected to the driving bevel gear 22, acting as a bridge for power transmission. The end of the adjusting rod 20 extends to the outside of the cross frame 8 and is fixedly installed with the internal hexagonal adjusting nut 21. The internal hexagonal adjusting nut 21 allows for easy manual adjustment by an operator using an internal hexagonal wrench, providing convenient operation and high adjustment precision. Fine adjustments of the thrust can be achieved by rotating the internal hexagonal adjusting nut 21 without the need for complex tools or professional skills. A fixed internal hexagonal adjusting nut 21 is also installed on the inner end of the adjusting rod 20. The driving bevel gear 22, acting as the power input gear, rotates under the drive of the adjusting rod 20. Through gear meshing, it transmits power to the driven bevel gears 23 on both sides, realizing the splitting and synchronous transmission of power. The inner ends of the short shaft 17 extend into the interior of the second chamber 19 and are fixedly installed with the driven bevel gears 23. The driven bevel gears 23 mesh with the driving bevel gear 22, converting the rotational power of the driving bevel gear 22 into its own rotational motion, thereby driving the short shaft 17 and the threaded rod 18 to rotate. The inner ends of the driven bevel gears 23 are meshed with the outer ends of the driving bevel gears 22. By adopting the bevel gear meshing transmission method, the power can be transmitted in the vertical direction. The driven bevel gears 23 on both sides are symmetrically distributed, ensuring that the rotation direction and speed of the threaded rods 18 on both sides are consistent, so that the support platforms 16 on both sides move synchronously, ensuring that the force on both sides of the spring plate 11 is uniform.

[0033] Furthermore, a fixing ring 24 is fixedly installed on the outer diameter of the guide post 3 near the rear mold base 6. The fixing ring 24 is fixed to the guide post 3 and remains stationary. The inclined groove 25 on its inner sidewall provides motion guidance for the side ejector pin 26 and is the key structure for the side ejector pin 26 to realize the radial ejection action. The installation position of the fixing ring 24 is close to the rear mold base 6 to ensure that the side ejector pin 26 always keeps in contact with the inclined groove 25 during the movement of the rear mold base 6. Inclined grooves 25 are opened on all four sides of the inner sidewall of the fixing ring 24. The inclined grooves 25 adopt an inclined design, and their inclination angle is precisely calculated so that during the linear movement of the rear mold base 6 in mold closing and demolding, the outer end of the side ejector pin 26 slides along the inclined groove 25, thereby generating radial reciprocating movement, realizing the retraction and ejection action of the side ejector pin 26. The surface of the inclined groove 25 is smoothed to reduce the frictional resistance between it and the side ejector pin 26 and ensure the smooth movement of the side ejector pin 26.

[0034] Furthermore, ejector pin grooves are formed around the inner sidewall of the shoe mold cavity 7, and side ejector pins 26 are movably installed in each ejector pin groove. The side ejector pins 26 are evenly distributed around the shoe mold cavity 7 and are used to eject the shoe from the side of the sole, avoiding the sole from sticking to the mold cavity wall, which would cause demolding difficulties or damage to the sole. The ejector pin grooves provide storage and movement space for the side ejector pins 26, ensuring that the side ejector pins 26 do not affect the sealing of the shoe mold cavity 7 during radial movement. The outer ends of the side ejector pins 26 extend to the outside of the rear mold base 6 and abut against the inner wall of the corresponding inclined groove 25. The outer ends of the side ejector pins 26 are tightly fitted with the inclined groove 25, and the force is transmitted through the movement of the rear mold base 6. The side ejector pins 26 are guided by the inclined groove 25 to complete radial displacement. Each side ejector pin 26 has a return spring 27 fixedly installed on its outer diameter. The return spring 27 is sleeved on the outer diameter of the side ejector pin 26. When the mold is closed, the side ejector pins 26 move outward along the inclined groove 25, and the return spring 27 is compressed to accumulate elastic force. When the mold is demolded, the return spring 27 releases the elastic force to assist the side ejector pins 26 in quickly returning to their original position and ejecting the side of the shoe sole. At the same time, the return spring 27 also plays a buffering role to avoid excessive pushing force of the side ejector pins 26 from damaging the shoe sole. Its elastic recovery force ensures that the side ejector pins 26 can accurately return to the ejector pin groove after each demolding, preparing for the next mold closing.

[0035] Furthermore, the inner end of the positive ejector pin 15 is connected via a connecting pipe 29. The connecting pipe 29 adopts a sealed design to ensure that the high-pressure gas does not leak, realizing gas communication between multiple positive ejector pins 15. This allows the high-pressure gas to be evenly distributed to each positive ejector pin 15, ensuring that the gas pressure at each outlet 31 is consistent. A high-pressure gas inlet pipe 30 is fixedly installed on one side of the connecting pipe 29. The high-pressure gas inlet pipe 30 serves as the input channel for high-pressure gas and can be connected to an external high-pressure gas source. The timing and pressure of gas introduction can be controlled according to the demolding requirements. The side of the positive ejector pin 15 closest to the shoe mold cavity 7 Several air outlets 31 are provided on the outer diameter. The air outlets 31 are evenly distributed along the length of the positive ejector pin 15 and face the inner wall of the shoe mold cavity 7. When demolding, high-pressure gas is sprayed out from the air outlets 31. On the one hand, it can form a gas film between the sole and the inner wall of the shoe mold cavity 7, reducing the friction between the two and assisting the sole to separate quickly. On the other hand, the high-pressure gas can carry away the residual heat in the shoe mold cavity 7 during the flow, realizing the cooling of the mold cavity. At the same time, it can also blow away the small amount of residual injection liquid debris in the mold cavity, playing a role in cleaning the mold cavity and avoiding residual impurities from affecting the quality of the next sole molding.

[0036] Furthermore, an electric cylinder 32 is fixedly installed on the outer end of the rear mold frame 2. As the power source of the device, the electric cylinder 32 features stable power output and precise stroke control, providing continuous and controllable driving force for the mold closing and demolding processes. Its installation on the outer end of the rear mold frame 2 ensures installation stability and facilitates later maintenance and repair. The drive end of the electric cylinder 32 extends to the inner side of the rear mold frame 2 and is fixedly installed with a pusher 33. The pusher 33 adopts a rigid structure design, which can evenly transmit the driving force of the electric cylinder 32 to the crossbeam 8, avoiding… Excessive local stress can cause component deformation. The contact surfaces of the pusher 33 and the crossbeam 8 are matched to ensure the effectiveness of power transmission. When the mold is closed, the electric cylinder 32 drives the pusher 33 to move forward, pushing the crossbeam 8 through the connecting frame 28 to move the rear mold base 6 towards the front mold base 4 until the mold is closed. When demolding, the electric cylinder 32 controls the pusher 33 to retract backward. With the elastic force of the spring plate 11, the rear mold base 6 is separated from the front mold base 4, realizing the automated control of the demolding action. No manual operation is required, which greatly improves production efficiency and operational safety.

[0037] Working principle:

[0038] First, the electric cylinder 32 is activated, driving the pusher 33 to move. After the pusher 33 contacts the cross frame 8, it will drive the rear mold base 6 to move through the connecting frame 28 until the rear mold base 6 and the front mold base 4 are closed. During this process, the fixed guide rod 5 will bend the rotating frame 9 through the first connecting rod 13. When the rotating frame 9 bends, it will press the spring plate 11 through the pressure roller 12 and accumulate elastic force. At the same time, when the rotating frame 9 bends, it will drive the positive ejector pin 15 to move through the second connecting rod 14, retracting the positive ejector pin 15 into the ejector pin groove. At the same time, the side ejector pin 26 will move along the inclined groove 25 on the inner wall of the fixed ring frame 24. Under the action of the return spring 27, the side ejector pin 26 also returns to the ejector pin groove. At this time, it will move towards the mold through the injection joint. Molding liquid is injected into the shoe mold cavity 7 after molding to form a shoe mold. After the shoe mold cools down, the electric cylinder 32 controls the pusher 33 to retract and reset. At this time, the bent spring plate 11 releases its elastic force, driving the cross frame 8 and the rear mold base 6 to reset, causing the rear mold base 6 to separate from the front mold base 4. During this process, the positive ejector pin 15 is also pushed by the spring plate 11 and ejected from the ejector pin groove, pushing the shoe mold out of the shoe mold cavity 7. Since the pressure roller 12 will slide relative to the surface of the bending spring plate 11 during the bending process, the lever arm of the bent spring plate 11 also changes, compensating for the change in elastic force of the spring plate 11 as the degree of bending changes. The elastic force release process is the same, so that the spring plate 11 applies force to the positive ejector pin. The thrust of ejector pin 15 remains uniform and stable, ensuring the necessary ejection force for demolding without damaging the shoe mold due to excessive force. Simultaneously, as ejector pin 15 exits its ejector slot, high-pressure gas is introduced into the connecting pipe 29 via high-pressure gas inlet pipe 30. The gas flows through the interior of ejector pin 15 and exits into the shoe mold cavity 7 through outlet 31. This assists in separating the shoe mold from the shoe mold cavity 7 and cools and cleans the shoe mold cavity 7, preventing residue from affecting subsequent molding. Meanwhile, during the resetting process of rear mold base 6, side ejector pins 26 move along the inclined groove 25 and generate radial displacement, exiting from the ejector slot to eject the sides of the shoe mold. This system employs two positive ejector pins 15 and four side ejector pins 26. Ejection demolding not only prevents the shoe mold sides from sticking to the side wall of the shoe mold cavity 7, but also greatly improves demolding efficiency. In addition, the adjustment nut 21 can be rotated by an Allen wrench, which drives the adjustment rod 20 and the driving bevel gear 22 to rotate. The driving bevel gear 22 will drive the driven bevel gears 23 and the short shaft 17 on both sides to rotate, thereby driving the threaded rods 18 on both sides to rotate. When the threaded rods 18 rotate, they will drive the support platform 16 in the first chamber 10 to move inward or outward synchronously. When the position of the support platform 16 changes, the fulcrum of the spring plate 11 changes, and the elastic force generated when bending will also change accordingly, so that the pushing force of the positive ejector pin 15 will also change accordingly, which facilitates the demolding work of different shoe molds.

[0039] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A sole demolding treatment device for manufacturing safety shoes, comprising a front mold frame (1) and a rear mold frame (2), characterized in that, The inner side end four corners of the front mold frame (1) and the rear mold frame (2) are connected through four guide columns (3), the middle part of the inner side end of the front mold frame (1) is fixedly installed with a front mold base (4) and the middle part of the outer side end is provided with an injection joint, the inner side end four corners of the front mold base (4) are fixedly installed with fixed guide rods (5), the middle part outer diameter of the fixed guide rods (5) is movably installed on the four corners of the rear mold base (6), and the end of the rear mold base (6) close to the front mold base (4) is provided with a shoe mold cavity (7). The middle part of the front mold frame (1) and the rear mold frame (2) is provided with a cross frame (8), both ends of the cross frame (8) are movably installed with rotating frames (9), both sides of the inside of the cross frame (8) are provided with first cavities (10), both sides of the inside of the first cavities (10) are fixedly installed with spring plates (11), and the ends of the spring plates (11) extend to the inside of the corresponding rotating frame (9), the inner side wall of the rotating frame (9) is fixedly installed with pressing rollers (12), and the ends of the pressing rollers (12) abut against the front surface of the corresponding spring plate (11). The end of the rotating frame (9) close to the front mold frame (1) is movably installed with two first connecting rods (13), and the ends of the first connecting rods (13) are movably installed at the ends of the corresponding fixed guide rods (5), the end of the rotating frame (9) close to the front mold frame (1) is movably installed with a second connecting rod (14), the end of the second connecting rod (14) is movably installed with a right thimble (15), both sides of the inside of the rear mold base (6) are provided with thimble grooves, and the ends of the right thimbles (15) extend to the inside of the shoe mold cavity (7) through the corresponding thimble grooves, and the middle part of the inner side end of the cross frame (8) and the rear mold base (6) are connected through two connecting frames (28).

2. The shoe sole demolding treatment device for manufacturing safety shoes according to claim 1, characterized in that, The inside of the first cavity (10) is movably installed with a support table (16), and the front end of the support table (16) abuts against the back surface of the corresponding spring plate (11), the middle part of the inner side wall of the first cavity (10) is movably installed with a short shaft (17), the outer side end of the short shaft (17) is fixedly installed with a threaded rod (18), and the outer diameter of the threaded rod (18) is threadedly connected in the middle part of the corresponding support table (16).

3. The shoe sole demolding treatment device for manufacturing safety shoes according to claim 2, characterized in that, The middle part of the inside of the cross frame (8) is provided with a second cavity (19), one end of the inner side wall of the second cavity (19) is movably installed with an adjusting rod (20), the end of the adjusting rod (20) extends to the outside of the cross frame (8) and is fixedly installed with an internal hexagonal adjusting nut (21), the inner side end of the adjusting rod (20) is fixedly installed with a driving bevel gear (22), the inner side end of the short shaft (17) extends to the inside of the second cavity (19) and is fixedly installed with a driven bevel gear (23), and the inner side end of the driven bevel gear (23) is meshingly connected with the outer side of the driving bevel gear (22).

4. The shoe sole demolding treatment device for manufacturing safety shoes according to claim 1, characterized in that, The outer diameter of the guide column (3) is fixedly installed with a fixed ring frame (24) close to the rear mold base (6), and the inner side wall of the fixed ring frame (24) is provided with a slope groove (25) around.

5. The shoe sole demolding treatment device for manufacturing safety shoes according to claim 4, characterized in that, The inner side wall of the shoe mold cavity (7) is provided with a thimble groove, and a side thimble (26) is movably installed in the thimble groove.

6. The shoe sole demolding treatment device for manufacturing safety shoes according to claim 1, characterized in that, The inner side end of the positive thimble (15) is connected through a communication pipe (29), one side of the communication pipe (29) is fixedly provided with a high-pressure gas inlet pipe (30), and the outer diameter of the side of the positive thimble (15) close to the shoe mold cavity (7) is provided with a plurality of gas outlets (31).

7. The shoe sole demolding treatment device for manufacturing safety shoes according to claim 1, characterized in that, The outer side end of the rear mold frame (2) is fixedly provided with an electric cylinder (32), and the driving end of the electric cylinder (32) extends to the inner side of the rear mold frame (2) and is fixedly provided with a push frame (33).

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