Automatic demolding equipment for plastic injection mold

Abstract

The application discloses a kind of plastic injection mold automatic demolding equipment, belongs to plastic injection mold technical field.A kind of plastic injection mold automatic demolding equipment, including movable mould, static mould, movable mould upper end is equipped with multiple cavities, cavity inside is equipped with ejection mechanism, ejection mechanism is extruded to forming model, movable mould inside lower side is equipped with piston cavity, piston cavity inside is slidably installed with push plate, movable mould outside is equipped with driving mechanism, movable mould inside upper side is equipped with multiple first storage cavity, first storage cavity inside is equipped with suction mechanism, the suction mechanism of being equipped with can heat-conducting oil be sucked into first storage cavity and second storage cavity and store, and when next time need to heat main runner and branch runner, so that suction mechanism reverse movement can heat-conducting oil in first storage cavity and second storage cavity be pushed back to heat-conducting tube, increase the heating speed of heating wire.

Description

Technical Field

[0001] This invention relates to the field of plastic injection mold technology, and more specifically to an automatic demolding device for plastic injection molds. Background Technology

[0002] Plastic products are a general term for household and industrial goods made primarily from plastics. Compared to metals, stone, and wood, plastic products have advantages such as low cost and high plasticity. Injection molding is the main method used to mold plastic products.

[0003] Currently, hot runner molds are used for injection molding. Hot runner molds use a heating device to heat the cooled material in the runner. When injection molding is needed again, the material in the runner is reheated to melt it for the next injection. However, when the heating device stops heating between two uses, the residual heat in the hot runner mold dissipates as the mold cools down, resulting in wasted heat. Existing molds cannot automatically collect excess heat after injection molding and transfer it back to the outside of the main runner and branch runners for the next use, causing the material temperature in the runner to rise rapidly, resulting in poor performance.

[0004] In view of this, the present invention proposes an automatic demolding device for plastic injection molds. Summary of the Invention

[0005] 1. Technical problems to be solved

[0006] The purpose of this invention is to provide an automatic demolding device for plastic injection molds to solve the problems mentioned in the background art.

[0007] 2. Technical Solution

[0008] An automatic demolding device for plastic injection molds includes a moving mold and a stationary mold. The moving mold has multiple cavities at its upper end, and an ejection mechanism is provided inside each cavity. The ejection mechanism extrudes the molded mold. A piston cavity is provided on the lower side of the moving mold. A push plate is slidably installed inside the piston cavity. The lower end of the push plate is elastically connected to the inner wall of the piston cavity through an elastic element. When the push plate moves, it drives the ejection mechanism to move.

[0009] The moving mold is equipped with a drive mechanism, which includes an air bladder. The air bladder is connected to the inside of the piston chamber through a connecting pipe.

[0010] The moving mold has multiple first storage cavities on its upper side, and a suction mechanism is installed inside each of the first storage cavities. The stationary mold has multiple second storage cavities on its lower side. The first storage cavities and the second storage cavities are connected by a corrugated pipe. Both the first storage cavities and the second storage cavities have a heat insulation layer on their outer sides.

[0011] A flow divider plate is installed on the upper side inside the stationary mold. The flow divider plate has a main flow channel and multiple branch flow channels inside. The branch flow channels are connected to the main flow channel. Heat conduction pipes are installed outside the main flow channel and the branch flow channels. Heating wires are installed inside the heat conduction pipes. The size of the heat conduction pipes is larger than the size of the heating wires. The second storage cavity is connected to the inside of the heat conduction pipes through an input pipe. The inside of the heat conduction pipes is filled with heat conduction oil.

[0012] As an optional solution to the technical solution of this application, the ejection mechanism includes an ejection plate that is slidably installed inside the cavity, an ejection rod that is fixedly installed at the lower end of the ejection plate, and the lower end of the ejection rod extends through the inner wall of the cavity to the inside of the piston cavity and is fixedly connected to the upper end of the push plate.

[0013] As an optional solution to the technical solution of this application, the suction mechanism includes a piston block fixedly installed on the upper end of the push plate. The outer wall of the piston block slides in contact with the inner wall of the first storage cavity. A sealing plate is slidably installed on the upper side of the second storage cavity. Two limiting plates are fixedly installed on the upper end of the sealing plate. The upper end of the limiting plate is elastically connected to the inner wall of the second storage cavity through a first spring. A through hole is opened in the middle of the sealing plate. A sealing plate is slidably installed on the upper side of the middle of the sealing plate opposite to the through hole. The sealing plate is elastically connected to the sealing plate through a second spring. Two notches are opened on the upper side of the second storage cavity. A locking block is slidably installed inside the notch. A locking slot is opened on the outer wall of the limiting plate opposite to the locking block. The locking block engages with the locking slot. A third spring is fixedly installed on the end of the locking block away from the limiting plate. The other end of the third spring is fixedly connected to the inner wall of the notch.

[0014] As an optional solution to the technical solution of this application, a hot nozzle is installed at the lower end of the manifold, and a gate is opened at the lower end of the stationary mold relative to the outlet of the hot nozzle. A movable groove is opened on one side of the gate, and a sealing block is slidably installed inside the movable groove. The outer wall of the sealing block is in sliding contact with the movable groove and the inner wall of the gate, respectively.

[0015] As an optional solution to the technical solution of this application, the upper end of the movable groove is provided with a movable groove, a movable plate is slidably installed inside the movable groove, the lower end of the movable plate is tightly fitted with the upper end of the sealing block, a fourth spring is fixedly installed on the upper end of the movable plate, and the other end of the fourth spring is fixedly connected to the inner wall of the movable groove.

[0016] As an optional solution to the technical solution of this application, a driving rod is slidably installed inside the movable groove, and a pull rod is rotatably connected to one end of the driving rod near the sealing block. The end of the pull rod near the sealing block is rotatably connected to the outer wall of the sealing block.

[0017] As an optional solution to the technical solution of this application, an expansion cavity is provided inside the static mold at a position relative to the movable groove. One end of the driving rod near the expansion cavity extends through the inner wall of the movable groove into the expansion cavity, and the outer wall of the driving rod near the expansion cavity slides in contact with the inner wall of the expansion cavity. The expansion cavity is filled with thermally expanding liquid. A heat-conducting rod is provided through one end of the expansion cavity near the second storage cavity, and the other end of the heat-conducting rod is located inside the second storage cavity.

[0018] As an optional solution to the technical solution of this application, a plurality of rotating rods are rotatably connected inside the piston chamber. The positions of the rotating rods correspond to the positions of the ejector rods. A threaded groove is formed on the outer wall of the rotating rod. A protrusion is fixedly installed at one end of the inner wall of the ejector rod. The outer wall of the protrusion is in contact with the inner wall of the threaded groove. A pull rope is fixedly installed on the upper outer wall of the rotating rod. A striking block is fixedly installed at the other end of the pull rope. A plurality of fixing plates are fixedly installed on the inner wall of the ejector rod. The outer wall of the striking block is in contact with the outer wall of the fixing plate.

[0019] 3. Beneficial effects

[0020] Compared with the prior art, the advantages of this invention are:

[0021] (1) The present invention, through the suction mechanism and the first and second storage cavities, can automatically store the heat-conducting oil inside the heat-conducting pipe into the first and second storage cavities after the material enters the mold cavity, and keep it warm under the action of the insulation layer. When the main channel and the branch channel need to be heated again, the suction mechanism can move in the opposite direction to push the heat-conducting oil in the first and second storage cavities back into the heat-conducting pipe, so that the heat in the heat-conducting oil can be reused, increasing the heating speed of the heating wire, increasing the working efficiency of the device, and also saving energy.

[0022] (2) The present invention has an ejection mechanism that allows workers to automatically eject the molds in multiple cavities at the same time by squeezing the air bladder after the moving mold and the stationary mold are separated, making it convenient and quick to use.

[0023] (3) The present invention, through the setting of the sealing block in conjunction with the heat-conducting rod, the driving rod and the pull rod, can automatically block the gate after the material enters the cavity and the heat-conducting oil enters the first storage cavity and the second storage cavity, and make the sealing block consistent with the lower end of the stationary mold, thereby automatically cutting off the material between the cavity and the gate, and making the mold flat after production and the position aligned with the gate, with good performance.

[0024] (4) The present invention uses a set of striking blocks in conjunction with a fixed plate to make the ejector rod and ejector plate vibrate when the rotating rod rotates, thereby making it easier for the model to separate from the ejector plate during the demolding process. After the ejector plate ejects the model from the cavity, the workers can easily remove the model directly from the ejector plate. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0026] Figure 1 This is a schematic diagram of the internal structure of the moving mold and the stationary mold of the present invention.

[0027] Figure 2 This is a schematic diagram of the overall structure of the present invention.

[0028] Figure 3 This is a schematic diagram of the cavity structure of the present invention.

[0029] Figure 4 This is a schematic diagram of the piston chamber and push plate of the present invention.

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

[0031] Figure 6 This is a schematic diagram of the second storage cavity and the bellows section of the present invention.

[0032] Figure 7 This is a schematic diagram of the card block and the card slot of the present invention.

[0033] Figure 8 This is a schematic diagram of the internal structure of the ejector rod and the rotating rod part of the present invention.

[0034] Figure 9 This is a schematic diagram of the heating wire and heat pipe structure of the present invention.

[0035] Explanation of the labels in the diagram:

[0036] 1. Moving mold; 2. Stationary mold; 3. Cavity; 4. Ejection mechanism; 5. Piston chamber; 6. Push plate; 7. Drive mechanism; 8. Airbag; 9. Connecting pipe; 10. First storage chamber; 11. Suction mechanism; 12. Second storage chamber; 13. Bellows; 14. Insulation layer; 15. Diverter plate; 16. Main runner; 17. Diverter runner; 18. Heat conduction pipe; 19. Heating wire; 20. Input pipe; 21. Ejector plate; 22. Ejector rod; 23. Piston block; 24. Sealing plate; 25. Limiting plate; 26. First spring; 27. Through hole; 28. Sealing plate; 29. ​​Second spring; 30. Notch; 31. Locking block; 32. Locking slot; 33. Third spring; 34. Hot nozzle; 35. Gate; 36. Movable groove; 37. Sealing block; 38. Moving groove; 39. Moving plate; 40. Fourth spring; 41. Driving rod; 42. Pull rod; 43. Expansion chamber; 45. Heat-conducting rod; 46. Rotating rod; 47. Threaded groove; 48. Protrusion; 49. Pull rope; 50. Striking block; 51. Fixing plate. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of 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, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0038] Example:

[0039] Please see Figure 1-9An automatic demolding device for plastic injection molds includes a moving mold 1 and a stationary mold 2. The moving mold 1 and the stationary mold 2 are controlled to move by an external drive device. The upper end of the moving mold 1 has multiple cavities 3, and an ejection mechanism 4 is provided inside the cavity 3. The ejection mechanism 4 extrudes the molded mold. A piston cavity 5 is provided on the lower side inside the moving mold 1. A push plate 6 is slidably installed inside the piston cavity 5. The lower end of the push plate 6 is elastically connected to the inner wall of the piston cavity 5 through an elastic element, which can be a spring. When the push plate 6 moves, it drives the ejection mechanism 4 to move. A drive mechanism 7 is installed outside the moving mold 1. The drive mechanism 7 includes an air bladder 8, which is connected to the inside of the piston cavity 5 through a connecting pipe 9. Multiple first storage cavities 10 are provided on the upper side inside the moving mold 1. The first storage chamber 10 is equipped with a suction mechanism 11. Multiple second storage chambers 12 are opened inside the lower side of the stationary mold 2. The first storage chamber 10 and the second storage chamber 12 are connected by a corrugated pipe 13. The outer sides of the first storage chamber 10 and the second storage chamber 12 are equipped with a heat insulation layer 14. A flow divider 15 is installed on the upper side inside the stationary mold 2. The flow divider 15 has a main flow channel 16 and multiple flow dividers 17. The flow dividers 17 are connected to the main flow channel 16. Heat conduction pipes 18 are installed outside the main flow channel 16 and the flow dividers 17. Heating wires 19 are installed inside the heat conduction pipes 18. The size of the heat conduction pipes 18 is larger than the size of the heating wires 19. The second storage chamber 12 is connected to the heat conduction pipes 18 through an input pipe 20. The heat conduction pipes 18 are filled with heat conduction oil.

[0040] Specifically, the ejection mechanism 4 includes an ejection plate 21 that is slidably installed inside the cavity 3. An ejection rod 22 is fixedly installed at the lower end of the ejection plate 21. The lower end of the ejection rod 22 extends through the inner wall of the cavity 3 into the piston cavity 5 and is fixedly connected to the upper end of the push plate 6.

[0041] The suction mechanism 11 includes a piston block 23 fixedly mounted on the upper end of the push plate 6. The outer wall of the piston block 23 slides in contact with the inner wall of the first storage cavity 10. A sealing plate 24 is slidably mounted on the upper side of the second storage cavity 12. Two limiting plates 25 are fixedly mounted on the upper end of the sealing plate 24. The upper ends of the limiting plates 25 are elastically connected to the inner wall of the second storage cavity 12 by a first spring 26. A through hole 27 is opened in the middle of the sealing plate 24. A sealing plate 28 is slidably mounted on the upper side of the middle of the sealing plate 24 at a position opposite to the through hole 27. The sealing plate 28 can rotate relative to the sealing plate 24. The sealing plate 28 is larger than the through hole 27, and the sealing plate 28 can block the through hole 27. The sealing plate 28 is elastically connected to the sealing plate 24 through the second spring 29. Two notches 30 are opened on the upper side of the second storage cavity 12. A locking block 31 is slidably installed inside the notch 30. A locking slot 32 is opened on the outer wall of the limiting plate 25 relative to the locking block 31. The locking block 31 and the locking slot 32 are engaged. A third spring 33 is fixedly installed on the end of the locking block 31 away from the limiting plate 25. The other end of the third spring 33 is fixedly connected to the inner wall of the notch 30.

[0042] It is worth noting that a hot nozzle 34 is installed at the lower end of the manifold 15, and a gate 35 is opened at the lower end of the stationary mold 2 relative to the outlet of the hot nozzle 34. A movable groove 36 is opened on one side of the gate 35, and a sealing block 37 is slidably installed inside the movable groove 36. The outer wall of the sealing block 37 slides in contact with the inner wall of the movable groove 36 and the gate 35 respectively.

[0043] In addition, a movable groove 38 is provided at the upper end of the movable groove 36. A movable plate 39 is slidably installed inside the movable groove 38. The lower end of the movable plate 39 is tightly fitted with the upper end of the sealing block 37. The movable plate 39 can prevent materials from entering the movable groove 36. A fourth spring 40 is fixedly installed at the upper end of the movable plate 39. The other end of the fourth spring 40 is fixedly connected to the inner wall of the movable groove 38. The fourth spring 40 can make the movable plate 39 and the sealing block 37 fit tightly together.

[0044] It is worth noting that a drive rod 41 is slidably installed inside the movable groove 36. A pull rod 42 is rotatably connected to one end of the drive rod 41 near the sealing block 37. The pull rod 42 is rotatably connected to the outer wall of the sealing block 37 at one end. The sealing block 37 can block the gate 35, thereby making the surface of the molded model smooth, and at the same time avoiding the need to cut off the gate 35 after the model is formed.

[0045] In addition, an expansion cavity 43 is provided inside the stationary mold 2 at a position relative to the movable groove 36. One end of the driving rod 41 near the expansion cavity 43 extends through the inner wall of the movable groove 36 into the expansion cavity 43. The outer wall of the end of the driving rod 41 near the expansion cavity 43 slides in contact with the inner wall of the expansion cavity 43. The expansion cavity 43 is filled with thermally expanding liquid. A heat-conducting rod 45 is provided through one end of the expansion cavity 43 near the second storage cavity 12. The other end of the heat-conducting rod 45 is located inside the second storage cavity 12. The middle part of the driving rod 41 is made of heat-insulating material, which has poor thermal conductivity.

[0046] Based on the above scheme, multiple rotating rods 46 are rotatably connected inside the piston chamber 5. The position of the rotating rods 46 corresponds to the position of the ejector rod 22. The outer wall of the rotating rods 46 is provided with a threaded groove 47. A protrusion 48 is fixedly installed at one end of the inner wall of the ejector rod 22. The outer wall of the protrusion 48 is in contact with the inner wall of the threaded groove 47. The protrusion 48 pressing against the inner wall of the threaded groove 47 can make the rotating rods 46 rotate. A pull rope 49 is fixedly installed on the upper outer wall of the rotating rods 46. A striking block 50 is fixedly installed at the other end of the pull rope 49. Multiple fixing plates 51 are fixedly installed on the inner wall of the ejector rod 22. The collision between the striking block 50 and the fixing plate 51 can make the ejector rod 22 and the ejector plate 21 vibrate. The outer wall of the striking block 50 is in contact with the outer wall of the fixing plate 51. The sealing points in this device can be sealed by rubber gaskets and sliding sealing rings.

[0047] Working principle: When the device is in use, an external drive device moves the moving mold 1, thereby merging the moving mold 1 with the stationary mold 2. Then, an external feeding mechanism feeds the material for making the mold into the main channel 16. At this time, the material is dispersed into each branch channel 17 after passing through the main channel 16, and is fed into the cavity 3 through the gate 35 via the hot nozzle 34. When the material enters the cavity 3, the ejector plate 21 will descend under the action of gravity. When the ejector plate 21 descends, it can drive the push plate 6 to descend through the ejector rod 22, thereby pushing the air in the piston chamber 5 back into the airbag 8. When the push plate 6 descends, it can drive the piston block 23 to descend, thereby reducing the pressure in the first storage chamber 10, and through the corrugated... Pipe 13 reduces the pressure in the second storage chamber 12. This pressure reduction allows the locking block 31 to move along the notch 30. When the locking block 31 reaches a certain position, it disengages from the locking slot 32. At this point, under pressure, the sealing plate 24 descends, opening the upper side of the second storage chamber 12. This allows the heat-conducting oil in the heat-conducting pipe 18 to enter the second storage chamber 12 and the first storage chamber 10 via the input pipe 20. When the push plate 6 is at its lowest position, the piston block 23 is also at its lowest position, and the heat-conducting oil in the heat-conducting pipe 18 is located within both the second and first storage chambers 12 and 10. When the pressure in the second storage chamber 12 is the same as the pressure in the input pipe 20, the limiting plate 25 is activated by the first spring 26. The sealing plate 24 can be raised, and when the locking block 31 corresponds to the position of the locking slot 32, the locking block 31 can be locked into the locking slot 32 again under the action of the third spring 33, thereby blocking the upper side of the second storage cavity 12. At this time, the heat in the heat transfer oil can be transferred to the expansion cavity 43 through the heat transfer rod 45, thereby causing the thermal expansion liquid in the expansion cavity 43 to expand. After the thermal expansion liquid expands, it can push the driving rod 41 to move along the direction of the movable groove 36. After the driving rod 41 moves, it can push the pull rod 42. Since the length of the pull rod 42 is fixed, when the outer wall of the sealing block 37 is attached to the inner wall of the gate 35, the pull rod 42 can rotate under the action of the thrust, thereby pushing the sealing block 37 to move downward along the direction of the gate 35 until the sealing block is closed. The lower end of the sealing block 37 is aligned with the lower end of the stationary mold 2. When the ejector rod 22 descends, the protrusion 48 on its inner wall can press against the inner wall of the threaded groove 47. Under the action of the decomposed force, the rotating rod 46 can rotate. After the rotating rod 46 rotates, the pull rope 49 can rotate the striking block 50 on its outer wall. The striking block 50 can hit the outer wall of the fixed plate 51, causing the ejector rod 22 and the ejector plate 21 to vibrate. This can prevent the material from failing to spread quickly under tension. After a long cooling period, the material in the cavity 3 can be formed. At this time, the external drive mechanism 7 is used to separate the moving mold 1 from the stationary mold 2, and then the air bladder 8 is squeezed, so that a large amount of air in the air bladder 8 enters the piston chamber 5, thereby causing the push plate 6 to rise.After the push plate 6 rises, it can simultaneously squeeze the model inside the cavity 3 through the ejector rod 22 and the ejector plate 21, thereby separating it from the cavity 3. During this process, the striking block 50 can still collide with the fixed plate 51, causing the ejector rod 22 and the ejector plate 21 to vibrate. This, combined with the release agent applied inside the mold, allows the model to quickly separate from the inner wall of the cavity 3. When the push plate 6 rises and merges the moving mold 1 and the stationary mold 2 again, the piston block 23 can squeeze the heat transfer oil in the first storage cavity 10, and the bellows 13 can contract. At this time, under the pressure, the heat transfer oil can push open the sealing plate 28, allowing the heat transfer oil to return to the heat transfer pipe 18 through the through hole 27 and the input pipe 20. Then, the airbag 8 is released. Under the influence of air pressure within the piston chamber 5, the airbag 8 returns to its initial state. Furthermore, under its own weight, the push plate 6 descends a certain distance, maintaining balance with the elastic element and air pressure. As the push plate 6 descends, the residual heat-conducting oil in the first storage chamber 10 flows into the first storage chamber 10 through the bellows 13, thus detaching from the heat-conducting rod 45. At this point, the thermal expansion and contraction of the liquid causes the drive rod 41 to move back to its initial position, and the pull rod 42 pulls the sealing block 37, causing it to move back to its initial position along its previous path. This opens the gate 35, allowing the heating wire 19 to melt the material in the main channel 16 and the branch channel 17 again, enabling the material to flow into the cavity 3.

[0048] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. An automatic demolding device for plastic injection molds, comprising a moving mold (1) and a stationary mold (2), characterized in that: The moving mold (1) has multiple cavities (3) at its upper end. An ejection mechanism (4) is provided inside the cavity (3). The ejection mechanism (4) extrudes the molding model. A piston cavity (5) is provided on the lower side inside the moving mold (1). A push plate (6) is slidably installed inside the piston cavity (5). The lower end of the push plate (6) is elastically connected to the inner wall of the piston cavity (5) through an elastic element. When the push plate (6) moves, it drives the ejection mechanism (4) to move. A drive mechanism (7) is installed outside the moving mold (1). The drive mechanism (7) includes an air bladder (8). The air bladder (8) is connected to the inside of the piston cavity (5) through a connecting pipe (9). Multiple first storage cavities (10) are provided on the upper side inside the moving mold (1). A suction mechanism (11) is installed inside the first storage cavity (10). The lower side of the stationary mold (2) is... Multiple second storage cavities (12) are provided. The first storage cavity (10) and the second storage cavity (12) are connected by a corrugated pipe (13). The first storage cavity (10) and the second storage cavity (12) are provided with a heat insulation layer (14) on the outside. A flow divider plate (15) is installed on the upper side inside the static mold (2). The flow divider plate (15) has a main flow channel (16) and multiple flow dividers (17) inside. The flow dividers (17) are connected to the main flow channel (16). Heat conduction pipes (18) are installed outside the main flow channel (16) and the flow dividers (17). Heating wires (19) are installed inside the heat conduction pipes (18). The size of the heat conduction pipes (18) is larger than the size of the heating wires (19). The second storage cavity (12) is connected to the inside of the heat conduction pipes (18) through an input pipe (20). The heat conduction pipes (18) are filled with heat conduction oil. A hot nozzle (34) is installed at the lower end of the flow divider (15). A gate (35) is opened at the lower end of the stationary mold (2) relative to the outlet of the hot nozzle (34). A movable groove (36) is opened on one side of the gate (35). A sealing block (37) is slidably installed inside the movable groove (36). The outer wall of the sealing block (37) is in sliding contact with the movable groove (36) and the inner wall of the gate (35). A drive rod (41) is slidably installed inside the movable groove (36). A pull rod (42) is rotatably connected to one end of the drive rod (41) near the sealing block (37). The end of the pull rod (42) near the sealing block (37) is rotatably connected to the outer wall of the sealing block (37). An expansion cavity (43) is provided inside the static mold (2) at a position relative to the movable groove (36). One end of the driving rod (41) near the expansion cavity (43) extends through the inner wall of the movable groove (36) into the expansion cavity (43), and the outer wall of the driving rod (41) near the expansion cavity (43) slides in contact with the inner wall of the expansion cavity (43). The expansion cavity (43) is filled with thermally expanding liquid. A heat-conducting rod (45) is provided through one end of the expansion cavity (43) near the second storage cavity (12), and the other end of the heat-conducting rod (45) is located inside the second storage cavity (12).

2. The automatic demolding equipment for plastic injection molds according to claim 1, characterized in that: The ejection mechanism (4) includes an ejection plate (21) that is slidably installed inside the cavity (3). An ejection rod (22) is fixedly installed at the lower end of the ejection plate (21). The lower end of the ejection rod (22) extends through the inner wall of the cavity (3) to the piston cavity (5) and is fixedly connected to the upper end of the push plate (6).

3. The automatic demolding equipment for plastic injection molds according to claim 2, characterized in that: The inhalation mechanism (11) includes a piston block (23) fixedly mounted on the upper end of the push plate (6). The outer wall of the piston block (23) slides in contact with the inner wall of the first storage cavity (10). A sealing plate (24) is slidably mounted on the upper side of the second storage cavity (12). Two limiting plates (25) are fixedly mounted on the upper end of the sealing plate (24). The upper end of the limiting plate (25) is elastically connected to the inner wall of the second storage cavity (12) through a first spring (26). A through hole (27) is opened in the middle of the sealing plate (24). The upper side of the middle of the sealing plate (24) is slidably mounted relative to the position of the through hole (27). There is a sealing plate (28), which is elastically connected to the sealing plate (24) by a second spring (29). Two notches (30) are opened on the upper side of the second storage cavity (12). A locking block (31) is slidably installed inside the notch (30). A slot (32) is opened on the outer wall of the limiting plate (25) relative to the locking block (31). The locking block (31) is engaged with the slot (32). A third spring (33) is fixedly installed on one end of the locking block (31) away from the limiting plate (25). The other end of the third spring (33) is fixedly connected to the inner wall of the notch (30).

4. The automatic demolding equipment for plastic injection molds according to claim 3, characterized in that: The upper end of the movable groove (36) is provided with a movable groove (38), and a movable plate (39) is slidably installed inside the movable groove (38). The lower end of the movable plate (39) is tightly fitted with the upper end of the sealing block (37). A fourth spring (40) is fixedly installed on the upper end of the movable plate (39), and the other end of the fourth spring (40) is fixedly connected to the inner wall of the movable groove (38).

5. An automatic demolding device for plastic injection molds according to claim 4, characterized in that: Multiple rotating rods (46) are rotatably connected inside the piston chamber (5). The position of the rotating rods (46) corresponds to the position of the ejector rod (22). The outer wall of the rotating rod (46) is provided with a threaded groove (47). A protrusion (48) is fixedly installed at one end of the inner wall of the ejector rod (22). The outer wall of the protrusion (48) is in contact with the inner wall of the threaded groove (47). A pull rope (49) is fixedly installed on the upper outer wall of the rotating rod (46). A striking block (50) is fixedly installed at the other end of the pull rope (49). Multiple fixing plates (51) are fixedly installed on the inner wall of the ejector rod (22). The outer wall of the striking block (50) is in contact with the outer wall of the fixing plate (51).

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