A molding device for biodegradable plastics

Abstract

The invention discloses a biodegradable plastic molding device, relates to the field of biodegradable plastic production, solves the problem that the existing biodegradable plastic molding device is difficult to exhaust quickly, comprises: a device base and a lower mold arranged above the device base, an upper mold is arranged on the top of the lower mold, an injection pipe is fixedly installed on the top of the upper mold, and two exhaust pipes are arranged on the top of the upper mold; further comprises: an exhaust mechanism, which is used for quickly exhausting the gas between the upper mold and the lower mold, and the exhaust mechanism is installed between the exhaust pipe and the upper mold; the invention makes the exhaust pipe rotate through the exhaust mechanism, opens the first air vent on the top of the upper mold, and the gas can enter the exhaust pipe, and when the exhaust pipe stops moving, the first air vent on the upper mold is sealed, and then the gas in the exhaust pipe is extracted, so as to realize the rapid exhaust of the gas in the plastic product, thereby achieving the effect of safe exhaust.

Description

Technical Field

[0001] The invention relates to the field of biodegradable plastic production, in particular to a biodegradable plastic molding device. Background Art

[0002] Biodegradable plastics are a type of plastic that can be decomposed into small molecules such as water, carbon dioxide, and methane by microorganisms in nature under specific environmental conditions (such as microbial action, humidity, temperature, etc.). Unlike traditional petroleum-based plastics, the decomposition process of biodegradable plastics does not require human intervention, and the final product is harmless to the environment.

[0003] Biodegradable materials are made of a variety of composite materials and are usually injection molded using corresponding molding devices. Since biodegradable plastics are prone to produce gas, poor exhaust will lead to problems such as bubbles, burning, and material shortages. Therefore, the molding device must optimize exhaust. The existing molding device uses a cam push method to move the lower mold and the upper mold upward synchronously. The two spring-loaded valve plates will push open the sealing plate on the inner side of the upper mold to exhaust the cavity. The elasticity of the spring is used to reduce the descending speed of the lower mold and the upper mold. However, the reduction in the descending speed of the upper mold and the lower mold makes it difficult to vibrate the plastic products in the cavity, and the gas in the plastic products is difficult to discharge, which reduces the exhaust efficiency. Summary of the invention

[0004] The object of the present invention is to provide a biodegradable plastic molding device to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A molding device for biodegradable plastics, comprising: a device base and a lower mold arranged above the device base, an upper mold arranged on the top of the lower mold, the upper mold docking with the lower mold through a plurality of bolts, an injection nozzle fixedly installed on the top of the upper mold, and two symmetrically distributed exhaust pipes arranged on the top of the upper mold; further comprising: an exhaust mechanism for quickly exhausting the gas between the upper mold and the lower mold, the exhaust mechanism being installed between the exhaust pipe and the upper mold; an anti-leakage mechanism for automatically sealing the exhaust pipe, the anti-leakage mechanism being installed on the top of the exhaust pipe; a loosening mechanism for assisting demoulding of the plastic product between the upper mold and the lower mold, the loosening mechanism being installed on the bottom of the lower mold.

[0007] Preferably, the exhaust mechanism includes an intake valve fixedly installed at the bottom of the exhaust pipe. A sealing block is fixedly installed at the bottom of the intake valve. A groove for rotatably installing the sealing block is formed at the top of the upper mold. A plurality of first air-permeable holes symmetrically distributed about the center are formed in the groove of the upper mold. A plurality of second air-permeable holes symmetrically distributed about the center are formed on the surface of the sealing block. An installation ring is fixedly installed on the outer side of the exhaust pipe. A plurality of sliding rods symmetrically distributed about the center are fixedly installed on the outer side of the installation ring. A U-shaped bracket is fixedly installed at the top of the device base. Two symmetrically distributed top covers are fixedly installed at the top of the U-shaped bracket. A sleeve is fixedly installed at the bottom of the top cover. A first spiral groove and a second spiral groove for limiting the sliding of the sliding rod are formed inside the sleeve. The first spiral groove is located above the second spiral groove, and the first spiral groove is connected to the second spiral groove through a vertical groove. A docking pipe is fixedly installed at the top of the top cover. A exhaust pipe is fixedly installed at the top of the exhaust pipe. A air extraction bellows is fixedly installed at the top of the device base, and the air extraction bellows is connected to the docking pipe through a trachea. A lifting assembly for moving the lower mold is further provided at the top of the device base.

[0008] Preferably, the leak-proof mechanism includes a sealing ball arranged inside the docking pipe. The outer diameter of the sealing ball is smaller than the inner diameter of the docking pipe. A sealing ring is fixedly installed inside the docking pipe. The outer side of the sealing ball is in contact with the inner side of the sealing ring. An installation rod is fixedly installed at the top of the sealing ball. A breathable disc for limiting the sliding of the installation rod is fixedly installed inside the docking pipe. A spring is fixedly installed between the bottom of the breathable disc and the sealing ball. A plurality of positioning rods symmetrically distributed about the center are fixedly installed on the inner wall of the top of the exhaust pipe. A sealing disc is slidably installed between the plurality of positioning rods. A convex block is formed at the bottom end of the positioning rod. The top of the sealing disc is in contact with the bottom of the exhaust pipe. A push rod is fixedly installed at the top of the sealing disc. The inner diameter of the docking pipe is the same as the outer diameter of the exhaust pipe. A plurality of first tension springs symmetrically distributed about the center are fixedly installed between the sealing disc and the inner wall of the top of the exhaust pipe.

[0009] Preferably, the material loosening mechanism includes a moving sliding cavity formed inside the lower mold. A lower template is slidably installed inside the moving sliding cavity. A plurality of second tension springs symmetrically distributed about the center are fixedly installed between the bottom of the lower template and the bottom of the moving sliding cavity. A plurality of moving rods fixedly installed at the bottom of the lower template and slidably passing through the lower mold are provided. A magnet block is fixedly installed on the outer side of the moving rod. A copper pipe is slidably installed on the outer side of the magnet block. The copper pipe is fixedly installed at the bottom of the lower mold. A support frame is fixedly installed at the top of the device base. The top of the support frame is in contact with the bottom end of the moving rod.

[0010] Preferably, the lifting assembly includes a mounting table fixedly installed at the bottom of the lower mold, and a plurality of electric telescopic rods distributed in a rectangular array are fixedly installed between the bottom of the mounting table and the top of the device base.

[0011] Preferably, sleeve plates are fixedly installed on both sides of the mounting table, and the sleeve plates are slidably installed on the outer side of the U-shaped bracket.

[0012] Preferably, a positioning shaft is fixedly installed on the outer side of the intake valve, and a circular frame for limiting the sliding of the positioning shaft is fixedly installed on the top of the upper mold.

[0013] Preferably, a filter tank is installed between the air extraction bellows and the air pipe.

[0014] Preferably, a positioning ring is fixedly installed on the outer side of the sealing block, and an annular cavity for limiting the sliding of the positioning ring is formed in the groove of the upper mold.

[0015] Preferably, a retaining ring is fixedly installed on the top of the sealing disc, and the inner side of the retaining ring is in contact with the outer side of the exhaust pipe.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0017] Through the exhaust mechanism of the present invention, when the upper mold and the lower mold move upward, the exhaust cylinder can be in a rotating state to open the first air vents on the top of the upper mold, and the gas inside the upper mold and the lower mold can enter the exhaust cylinder. When the exhaust cylinder stops moving, the first air vents on the upper mold are sealed, and then the gas inside the exhaust cylinder is pumped out, realizing the rapid discharge of the gas in the plastic product without vibrating the plastic product, thereby achieving the effect of safe exhaust.

[0018] Through the anti-leakage mechanism of the present invention, when the docking pipe is docked with the exhaust pipe, the push rod can push open the sealing ball to open the docking pipe, and when the sealing ball stops moving, the push rod can be pushed by the reaction force of the sealing ball to push the sealing disc to open the exhaust pipe, and the air extraction bellows can pump out the gas inside the exhaust cylinder, thereby achieving the effect of exhaust anti-leakage.

[0019] Through the material loosening mechanism of the present invention, during the upward movement of the lower mold, the moving rod can move away from the support frame, and by using the resilience of the second tension spring, the lower template can move downward, increasing the internal space of the lower mold, realizing the auxiliary demoulding of the plastic product, and facilitating the discharge of the gas between the lower mold and the upper mold, thereby improving the exhaust efficiency and facilitating the demoulding effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2It is a schematic diagram of the structure of the U-shaped bracket and the upper mold in the present invention;

[0022] Figure 3 It is a schematic diagram of the exhaust pipe and sleeve structure in the present invention;

[0023] Figure 4 It is a schematic diagram of the structure of the mounting ring and the sliding rod in the present invention;

[0024] Figure 5 It is a schematic diagram of the sealing block and the circular frame structure in the present invention;

[0025] Figure 6 It is a schematic diagram of the structure of the butt-joint pipe and the exhaust pipe in the present invention;

[0026] Figure 7 It is a schematic diagram of the sealing ball and the push rod structure in the present invention;

[0027] Figure 8 It is a schematic diagram of the lower template and the support frame structure of the present invention.

[0028] In the figure: 1. device base; 2. lower mold; 3. upper mold; 4. injection molding pipe; 5. exhaust pipe; 6. intake valve; 7. positioning shaft; 8. circular frame; 9. sealing block; 10. mounting ring; 11. sliding rod; 12. U-shaped bracket; 13. top cover; 14. sleeve; 15. butt joint; 16. exhaust pipe; 17. exhaust bellows; 18. sealing ball; 19. sealing ring; 20. mounting rod; 21. breathable disk; 22. spring; 23. positioning rod; 24. sealing disk; 25. push rod; 26. first tension spring; 27. lower template; 28. second tension spring; 29. ​​moving rod; 30. magnet block; 31. copper tube; 32. retaining ring; 33. support frame; 34. mounting table; 35. electric telescopic rod; 36. sleeve plate; 37. filter tank; 38. positioning ring. DETAILED DESCRIPTION

[0029] 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.

[0030] Example 1: Please refer to Figures 1 - 8The figure shows a biodegradable plastic molding device, which includes a device base 1 and a lower mold 2 arranged above the device base 1, an upper mold 3 is arranged on the top of the lower mold 2, and the upper mold 3 is connected to the lower mold 2 through multiple bolts, so that the upper mold 3 and the lower mold 2 form a cavity for injection molding of plastic products, an injection pipe 4 is fixedly installed on the top of the upper mold 3, which is used to inject raw materials between the upper mold 3 and the lower mold 2 for injection molding, and two symmetrically distributed exhaust pipes 5 are arranged on the top of the upper mold 3; it also includes: an exhaust mechanism, which is used to quickly exhaust the gas between the upper mold 3 and the lower mold 2, and the exhaust mechanism is installed between the exhaust pipe 5 and the upper mold 3.

[0031] The exhaust mechanism includes an intake valve 6 fixedly mounted on the bottom of the exhaust pipe 5, a positioning shaft 7 is fixedly mounted on the outer side of the intake valve 6, a circular frame 8 for limiting the sliding of the positioning shaft 7 is fixedly mounted on the top of the upper mold 3, so that the intake valve 6 and the exhaust pipe 5 can drive the positioning shaft 7 to rotate inside the circular frame 8, a sealing block 9 is fixedly mounted on the bottom of the intake valve 6, a groove for rotatably mounting the sealing block 9 is provided on the top of the upper mold 3, a positioning ring 38 is fixedly mounted on the outer side of the sealing block 9, an annular cavity for limiting the sliding of the positioning ring 38 is provided in the groove of the upper mold 3, the stability of the rotation of the sealing block 9 is improved, and the effect of preventing it from falling off is achieved, a plurality of first air holes symmetrically distributed in the center are provided in the groove of the upper mold 3, and a plurality of first air holes symmetrically distributed in the center are provided on the surface of the sealing block 9 The second air vent, when the second air vent on the sealing block 9 is aligned with the first air vent on the groove, the gas between the upper mold 3 and the lower mold 2 can enter the air inlet valve 6 through the first air vent and the second air vent. A mounting ring 10 is fixedly installed on the outside of the exhaust pipe 5, and a plurality of sliding rods 11 symmetrically distributed in the center are fixedly installed on the outside of the mounting ring 10. A U-shaped bracket 12 is fixedly installed on the top of the device base 1, and two symmetrically distributed top covers 13 are fixedly installed on the top of the U-shaped bracket 12. A sleeve 14 is fixedly installed on the bottom of the top cover 13. The inner side of the sleeve 14 is provided with a first spiral groove and a second spiral groove for limiting the sliding of the sliding rod 11. The first spiral groove is located above the second spiral groove, and the first spiral groove is connected to the second spiral groove through a vertical groove, so that the exhaust pipe When the slide bar 11 moves upward, the slide bar 11 can move along the first spiral groove, so that the slide bar 11 drives the exhaust pipe 5 to rotate through the mounting ring 10, and the second air hole on the sealing block 9 can be aligned with the first air hole on the groove, and as the exhaust pipe 5 moves, the gas in the upper mold 3 and the lower mold 2 enters the exhaust pipe 5, and when the slide bar 11 moves from the vertical groove to the second spiral groove, the second air hole on the sealing block 9 is aligned and staggered with the first air hole on the groove, and the sealing block 9 can seal the first air hole, and the top of the top cover 13 is fixedly installed with a butt joint 15, and the top of the exhaust pipe 5 is fixedly installed with an exhaust pipe 16, so that when the butt joint 15 is connected with the exhaust pipe 16, the gas in the exhaust pipe 5 can enter the butt joint 15, and the top of the device base 1 is fixedly installed with an exhaust pipe 16, A suction bellows 17 is fixedly installed on the bottom, and the suction bellows 17 is connected to the docking tube 15 through an air pipe, so that the suction bellows 17 can extract the gas in the docking tube 15, and a filter tank 37 is installed between the suction bellows 17 and the air pipe for filtering impurities in the gas. A lifting component for moving the lower mold 2 is also provided on the top of the device base 1, and the lifting component includes a mounting platform 34 fixedly installed on the bottom of the lower mold 2, and a plurality of electric telescopic rods 35 distributed in a rectangular array are fixedly installed between the bottom of the mounting platform 34 and the top of the device base 1, so that the electric telescopic rods 35 can push the lower mold 2 to move upward through the mounting platform 34, so that the exhaust pipe 5 on the top of the upper mold 3 can move upward synchronously, and sleeve plates 36 are fixedly installed on both sides of the mounting platform 34.The template 36 is slidably installed on the outer side of the U-shaped bracket 12 to improve the smoothness of the movement of the mounting table 34.

[0032] Embodiment 2: Please refer to Figure 6 and Figure 7 , this embodiment further illustrates Embodiment 1. The leak-proof mechanism in the figure includes a sealing ball 18 arranged inside the butt joint pipe 15. The outer diameter of the sealing ball 18 is smaller than the inner diameter of the butt joint pipe 15. A sealing ring 19 is fixedly installed inside the butt joint pipe 15. The outer side of the sealing ball 18 is in contact with the inner side of the sealing ring 19, so that when the sealing ball 18 is in contact with the inner side of the sealing ring 19, it can seal the butt joint pipe 15. An installation rod 20 is fixedly installed at the top of the sealing ball 18. An air-permeable disc 21 for limiting the sliding of the installation rod 20 is fixedly installed inside the butt joint pipe 15. A spring 22 is fixedly installed between the bottom of the air-permeable disc 21 and the sealing ball 18, which can make the sealing ball 18 contact with the inner side of the sealing ring 19 by the elasticity of the spring 22. A plurality of positioning rods 23 distributed symmetrically about the center are fixedly installed on the inner wall of the top of the exhaust cylinder 5. A sealing disc 24 is slidably installed between the plurality of positioning rods 23. A convex block is provided at the bottom end of the positioning rod 23 to provide a limit for the movement of the sealing disc 24. The top of the sealing disc 24 is in contact with the bottom of the exhaust pipe 16. A retaining ring 32 is fixedly installed at the top of the sealing disc 24. The inner side of the retaining ring 32 is in contact with the outer side of the exhaust pipe 16, and the bottom of the exhaust pipe 16 is made of rubber material to improve the sealing performance of the sealing disc 24 on the exhaust pipe 16. A push rod 25 is fixedly installed at the top of the sealing disc 24. The inner diameter of the butt joint pipe 15 is the same as the outer diameter of the exhaust pipe 16. A plurality of first tension springs 26 distributed symmetrically about the center are fixedly installed between the sealing disc 24 and the inner wall of the top of the exhaust cylinder 5.

[0033] Embodiment 3: Please refer to Figure 8, this embodiment further illustrates other embodiments. The material loosening mechanism in the figure includes a moving slide cavity opened inside the lower mold 2. A lower template 27 is slidably installed inside the moving slide cavity. A plurality of second tension springs 28 distributed centrosymmetrically are fixedly installed at the bottom of the lower template 27 and the bottom of the moving slide cavity. A plurality of moving rods 29 that slide through the lower mold 2 are fixedly installed at the bottom of the lower template 27. A magnet block 30 is fixedly installed on the outer side of the moving rod 29. A copper tube 31 is slidably installed on the outer side of the magnet block 30. When the magnet block 30 moves inside the copper tube 31, the electromagnetic damping principle of the magnet block 30 and the copper tube 31 can be used to reduce the moving speed of the magnet block 30, facilitating the second tension spring 28 to pull the lower template 27 to move at a uniform speed. The copper tube 31 is fixedly installed at the bottom of the lower mold 2. A support frame 33 is fixedly installed at the top of the device base 1. The top of the support frame 33 is in contact with the bottom end of the moving rod 29. When the moving rod 29 is in contact with the top of the support frame 33, the top of the moving rod 29 can be in contact with the top of the moving slide cavity and stretch the second tension spring 28. When the lower mold 2 moves upward, the moving rod 29 can be separated from the support frame 33, and the resilience of the second tension spring 28 is used to make the lower template 27 move downward, realizing the auxiliary demoulding of plastic products and facilitating exhaust.

[0034] Working principle: First, the staff injects the raw material between the upper mold 3 and the lower mold 2 through the injection tube 4 to make a plastic product. Then, the electric telescopic rod 35 pushes the lower mold 2 to move upward through the mounting table 34, so that the lower mold 2 drives the upper mold 3 to move synchronously. At the same time, the moving rod 29 at the bottom of the lower mold 27 is away from the support frame 33. The second tension spring 28 is used to pull the lower mold 27 to move downward along the moving slide cavity of the lower mold 2 by the rebound force of the second tension spring 28. The magnet block 30 on the moving rod 29 can move synchronously downward along the inner side of the copper tube 31. The electromagnetic damping characteristics of the magnet block 30 and the copper tube 31 are used to make the magnet block 30 move slowly and uniformly downward along the inner side of the copper tube 31 to prevent the lower mold 27 from moving downward. When the template 27 moves, it pulls the plastic product, thereby assisting in demoulding the plastic product and increasing the internal space of the lower mold 2. At the same time, the upper mold 3 drives the exhaust pipe 5 to move upward through the air inlet valve 6, so that the exhaust pipe 5 drives the slide bar 11 to move synchronously through the mounting ring 10. The slide bar 11 moves along the first spiral groove on the sleeve 14, so that the slide bar 11 can drive the exhaust pipe 5 to rotate during the movement through the mounting ring 10. The exhaust pipe 5 can drive the sealing block 9 to rotate synchronously through the air inlet valve 6, so that the second air vent on the sealing block 9 is aligned with the first air vent on the upper mold 3, and the gas between the upper mold 3 and the lower mold 2 can enter the air inlet valve 6 through the second air vent and the first air vent. , and then enters the exhaust tube 5, and in the process of the slide bar 11 moving along the vertical groove of the sleeve 14, the gas continues to enter the exhaust tube 5. When the slide bar 11 enters the second spiral groove of the sleeve 14, the exhaust tube 5 rotates again, so that the second air hole on the sealing block 9 is staggered with the first air hole on the upper mold 3, and the upper mold 3 can be sealed. At this time, the exhaust pipe 16 on the exhaust tube 5 contacts the docking tube 15 on the top cover 13, so that the exhaust pipe 16 is sleeved on the outside of the docking tube 15, and in the process of the exhaust pipe 16 moving, the push rod 25 on the inside of the exhaust pipe 16 contacts the sealing ball 18 on the inside of the docking tube 15, so that the sealing ball 18 pushes the push rod 25 to move downward, and the push rod 25 drives the sealing disk 24 moves synchronously, so that the sealing disk 24 is away from the bottom of the exhaust pipe 16, and when the bottom of the sealing disk 24 contacts the protrusion on the positioning rod 23, the protrusion provides resistance for the sealing disk 24 and the push rod 25. As the exhaust pipe 16 moves, the push rod 25 can push the sealing ball 18 away from the sealing ring 19, open the docking pipe 15, and the gas in the exhaust pipe 5 can enter the docking pipe 15 through the exhaust pipe 16. Then, the staff starts the exhaust bellows 17, and the exhaust bellows 17 extracts the gas in the exhaust pipe 5 through the air pipe and the docking pipe 15. Finally, the electric telescopic rod 35 resets downward, and the staff opens the upper mold 3 to take out the plastic product, thereby achieving the effect of safe exhaust and improving the exhaust efficiency.

[0035] It should be noted that, in this document, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variation thereof are intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements not only includes those elements but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device.

[0036] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A molding device for biodegradable plastics, characterized in that, include: The device base and the lower mold arranged above the device base, the upper mold is arranged on the top of the lower mold, the injection pipe is fixedly installed on the top of the upper mold, and two exhaust pipes are arranged on the top of the upper mold; Also includes: An exhaust mechanism is used to quickly exhaust the gas between the upper mold and the lower mold. The exhaust mechanism is installed between the exhaust pipe and the upper mold. The exhaust mechanism includes an air inlet valve fixedly installed at the bottom of the exhaust pipe, a sealing block is fixedly installed at the bottom of the air inlet valve, a groove for rotatably installing the sealing block is provided at the top of the upper mold, a plurality of first air holes symmetrically distributed in the center are provided in the groove, a plurality of second air holes symmetrically distributed in the center are provided on the surface of the sealing block, a mounting ring is fixedly installed at the outer side of the exhaust pipe, a plurality of sliding rods are fixedly installed at the outer side of the mounting ring, a U-shaped bracket is fixedly installed at the top of the device base, two top covers are fixedly installed at the top of the U-shaped bracket, a sleeve is fixedly installed at the bottom of the top cover, a first spiral groove and a second spiral groove for limiting sliding of the sliding rod are provided on the inner side of the sleeve, and the first spiral groove is butt-jointed with the second spiral groove through a vertical groove, a butt-jointed tube is installed at the top of the top cover, an exhaust pipe is installed at the top of the exhaust pipe, an exhaust bellows is installed at the top of the device base, and the exhaust bellows is butt-jointed with the butt-jointed tube through an air pipe, and a lifting component for moving the lower mold is also provided at the top of the device base; The anti-leakage mechanism is used for automatically sealing the exhaust pipe, the anti-leakage mechanism is installed at the top of the exhaust pipe, the anti-leakage mechanism includes a sealing ball arranged on the inner side of the butt joint tube, the outer diameter of the sealing ball is smaller than the inner diameter of the butt joint tube, a sealing ring is fixedly installed on the inner side of the butt joint tube, a mounting rod is fixedly installed on the top of the sealing ball, a breathable disk for limiting the sliding of the mounting rod is installed on the inner side of the butt joint tube, a spring is fixedly installed between the breathable disk and the sealing ball, a plurality of positioning rods are fixedly installed on the top inner wall of the exhaust pipe, a sealing disk is slidably installed between the plurality of positioning rods, a convex block is provided at the bottom end of the positioning rod, the top of the sealing disk is in contact with the bottom of the exhaust pipe, a push rod is fixedly installed on the top of the sealing disk, the inner diameter of the butt joint tube is the same as the outer diameter of the exhaust pipe, and a plurality of first tension springs are fixedly installed between the sealing disk and the top inner wall of the exhaust pipe; The material loosening mechanism is used to assist in demoulding the plastic product between the upper mold and the lower mold. The material loosening mechanism is installed at the bottom of the lower mold.

2. The molding device for biodegradable plastics according to claim 1, characterized in that: The material loosening mechanism includes a movable sliding cavity opened on the inner side of the lower mold, a lower mold plate is slidably installed on the inner side of the movable sliding cavity, a plurality of second tension springs are fixedly installed at the bottom of the lower mold plate and the bottom of the movable sliding cavity, a plurality of movable rods sliding through the lower mold are fixedly installed at the bottom of the lower mold plate, a magnet block is fixedly installed on the outer side of the movable rod, a copper tube is slidably installed on the outer side of the magnet block, the copper tube is fixedly installed at the bottom of the lower mold, a support frame is installed on the top of the device base, and the top of the support frame is in contact with the bottom end of the movable rod.

3. The molding device for biodegradable plastics according to claim 1, wherein: The lifting assembly comprises a mounting platform fixedly mounted on the bottom of the lower mold, and a plurality of electric telescopic rods distributed in a rectangular array are fixedly mounted between the bottom of the mounting platform and the top of the device base.

4. A molding device for biodegradable plastics according to claim 3, characterized in that: Both sides of the mounting platform are fixedly mounted with sleeve plates, which are slidably mounted on the outer sides of the U-shaped brackets.

5. The molding device for biodegradable plastics according to claim 1, characterized in that: A positioning shaft is fixedly installed on the outer side of the intake valve, and a circular frame for the positioning shaft to slide with limited position is fixedly installed on the top of the upper mold.

6. The molding device for biodegradable plastics according to claim 1, wherein: A filter tank is installed between the air extraction bellows and the air pipe.

7. A molding device for biodegradable plastics according to claim 1, characterized in that: A positioning ring is fixedly installed on the outer side of the sealing block, and an annular cavity for the positioning ring to slide with limited position is arranged in the groove of the upper mold.

8. A molding device for biodegradable plastics according to claim 1, characterized in that: A retaining ring is fixedly installed on the top of the sealing disc, and the inner side of the retaining ring is in contact with the outer side of the exhaust pipe.

Images