A double-layer energy-saving and high-efficiency mold for the production of EPS and EPP products

Abstract

The present invention discloses a double-layer energy-saving and high-efficiency mold for the production of EPS and EPP products, which relates to the field of foam processing technology, including a punch and a die, a delivery pipe is provided inside the die, a push rod is slidably connected inside the delivery pipe, two ends of the delivery pipe are fixedly connected to a cylinder and an extension pipe respectively, one end of the push rod is fixedly connected to a piston, and also includes a sealing mechanism, the sealing mechanism includes a separation pipe fixedly connected to the inner wall of the push rod, an air delivery component and a closing component are provided inside the separation pipe, the air delivery component includes a fixed rod fixed to the cylinder and a movable plate fixed to one end of the fixed rod, a plug is provided at one end of the push rod, a sealing ring is fixedly connected to the outside of the plug, and the gap between the plug and the extension pipe is sealed by inflating the sealing ring, so as to effectively prevent the water vapor from entering the gap between the extension pipe and the push rod when water vapor is introduced to heat the EPS or EPP beads after the mold is closed, so that the EPS beads are discharged smoothly with the airflow.

Description

Technical Field

[0001] The present invention relates to the technical field of foam processing, in particular to a double-layer energy-saving and high-efficiency mould for producing EPS and EPP products. Background Art

[0002] Expanded polystyrene (EPS) and expanded polypropylene (EPP) are two common foaming materials, widely used in packaging, construction, automotive and other fields. Traditional EPS and EPP product production molds mainly consist of a die, a punch and a feed gun. After the mold is closed, the feed gun is used to transport the pre-treated EPS or EPP beads into the mold cavity between the die and the punch. Steam is then introduced into the mold to heat it, causing the beads to expand again and fill the mold cavity. Finally, cooling water is introduced to cool the expanded material and shape it before demolding.

[0003] The material gun on the EPS mold consists of a delivery pipe and a piston push rod. The delivery pipe is provided with a feed branch pipe connected to the hopper and an air intake branch pipe connected to the compressor. When the compressor introduces compressed air into the delivery pipe through the air intake branch pipe, a negative pressure will be formed near the connection between the feed branch pipe and the delivery pipe under the action of high-speed airflow, so that the EPS beads in the hopper enter the delivery pipe through the feed branch pipe under negative pressure, and are ejected from the end of the delivery pipe into the mold cavity together with the compressed air. After the beads are delivered, the piston push rod is controlled to move to push out the remaining beads in the delivery pipe and close the delivery pipe.

[0004] In order to prevent the water vapor inside the mold cavity from passing through the gap between the delivery pipe and the piston push rod and entering the silo from the feed branch pipe during the production of EPS or EPP products, causing the material to become damp, sticky and agglomerated, a sealing ring must be installed between the delivery pipe and the piston push rod. However, after the piston push rod blocks the delivery pipe, water vapor will still enter between the delivery pipe and the piston push rod. When the EPS beads pass through the delivery pipe, the water on the inner wall of the delivery pipe will come into contact with the EPS beads in front, causing the beads to adhere to the pipe wall, hindering the flow of the beads behind, affecting the working efficiency of the material gun and the uniformity of the discharge. Moreover, when the bead size is small or there are fine beads, the beads are easily introduced into the gap between the piston push rod and the delivery pipe due to the viscosity of the water during the push of the piston push rod. The beads then expand due to heat, causing the delivery pipe to become stuck. Therefore, it is necessary to improve the existing molds for the production of EPS and EPP products. Summary of the Invention

[0005] The purpose of the present invention is to solve the problems of water vapor entering between the delivery pipe and the piston push rod, hindering the flow of EPS beads when they pass through the delivery pipe, affecting the working efficiency of the material gun and the uniformity of the discharge, and the problem that during the piston push rod pushing out, the beads easily enter between the piston push rod and the delivery pipe due to the viscosity of water, and then the beads expand due to heat and cause the delivery pipe to get stuck, and the traditional single-sided mold has low output and high energy consumption. In order to save energy, improve output and machine utilization, a double-layer energy-saving and high-efficiency mold for the production of EPS and EPP products is proposed.

[0006] To achieve the above objectives, the present invention adopts the following technologies: a double-layer energy-saving and high-efficiency mold for the production of EPS and EPP products: comprising a male mold and a female mold, a delivery pipe is provided inside the female mold, a push rod is slidably connected to the inside of the delivery pipe, the two ends of the delivery pipe are respectively fixedly connected to a cylinder and an extension pipe, one end of the push rod is fixedly connected to a piston, and further comprising:

[0007] A sealing mechanism, comprising a separation tube fixedly connected to the inner wall of the push rod, an air delivery assembly and a sealing assembly disposed within the separation tube, the air delivery assembly comprising a fixed rod fixed to the cylinder and a movable plate fixed to one end of the fixed rod, a plug disposed at one end of the push rod, and a sealing ring fixedly connected to the outside of the plug;

[0008] An air jet mechanism for controlling the ejection of air;

[0009] After the push rod blocks the extension tube, the sealing ring is inflated to seal the extension tube. When the push rod retracts, the air flow is ejected from the extension tube through the sealing component and the jet mechanism.

[0010] As a further description of the above technical solution: a one-way valve 1 is installed on the movable plate, the closing assembly includes a closing plate and a spring fixed between the closing plate and the extension tube, an internal connecting tube is fixedly connected to the separating tube at a position between the closing plate and the piston, the position of the opening on the closing plate is staggered with the position of the one-way valve 1, and when the movable plate moves to contact the closing plate, the closing plate closes the one-way valve 1.

[0011] As a further description of the above technical solution: a one-way valve 2 communicating with the interior of the cylinder is installed inside the piston, and an external communicating pipe communicating with the interior of the cylinder is fixedly connected to the bottom of the delivery pipe.

[0012] As a further description of the above technical solution: the jet mechanism includes a connector that is rotatably connected to the inside of the separation tube and fixed to the plug, a one-way valve three is installed inside the connector, an air duct with an inclined outlet is provided inside the plug, and a one-way membrane flap is fixedly arranged inside the air duct.

[0013] As a further description of the above technical solution: an impeller is fixedly connected to the interior of the plug, and when the airflow passes through the interior of the plug, it pushes the blades of the impeller, driving the impeller to rotate.

[0014] As a further description of the above technical solution: a buffer pad is provided at the connection between the delivery pipe and the cylinder barrel. When the push rod is pushed out, the movable plate contacts the closing plate to compress the spring, and then the piston contacts the buffer pad.

[0015] As a further description of the above technical solution: it also includes a leakage detection unit, which includes a connecting tube fixedly connected to the extension tube, a temperature sensor is installed inside the connecting tube, a sealing ring is provided at the connection between the delivery tube and the extension tube, and a filter is fixedly connected to the inside of the connecting tube.

[0016] As a further description of the above technical solution: gears are rotatably connected on both sides of the punch, and the outer side of each gear is meshedly connected to two racks respectively fixed to the two die molds, and the opposite sides of the two die molds are fixedly connected to positioning rods slidably connected to the punch, and the extension tube is fixed to the die mold and extends to the inside of the die mold.

[0017] In summary, due to the use of the above technology, a double-layer energy-saving and high-efficiency mold for the production of EPS and EPP products has the following beneficial effects:

[0018] In this application, after the push rod pushes out the EPS or EPP beads and seals the delivery tube and the extension tube, the sealing ring is inflated to seal the gap between the plug and the extension tube, effectively preventing water vapor from entering the gap between the extension tube and the push rod when water vapor is introduced to heat the EPS or EPP beads after the mold is closed, thereby eliminating the situation where the EPS beads are wet and adhere to the inner wall of the extension tube, allowing the EPS beads to be discharged smoothly with the airflow, ensuring the working efficiency of the material gun and the uniformity of the discharge. In addition, it can also prevent fine beads from being wet and squeezing into the space between the push rod and the extension tube due to the action of viscosity, causing the push rod movement to be obstructed or even stuck, thereby ensuring the continuous and normal production of EPS or EPP products.

[0019] Moreover, the temperature sensor can detect water vapor leakage, and the material gun can be repaired or replaced in time. Moreover, under the double seal of the sealing ring and the sealing ring, the leaked water vapor will not enter the silo through the feed branch of the conveying pipe, thereby ensuring the safety of the silo, preventing the EPS beads from absorbing water and agglomerating near the feed branch and clogging, and ensuring the continuity of production.

[0020] When the push rod retracts, the relative movement of the movable plate and the separator tube causes the air inside the separator tube to be ejected through the air duct, generating an outward airflow in the extension tube to blow out the residual water around the plug and prevent the push rod from retracting and causing moisture inside the die to be sucked into the extension tube, further ensuring the dryness of the inner wall of the extension tube and improving the feeding effect of EPS or EPP beads. The airflow can also act on the fine beads adhering to the inner wall of the extension tube under the extrusion of the push rod, so that these beads are separated from the extension tube, making full use of the beads while avoiding obstruction of the push rod operation. In addition, the impeller can make the plug rotate during air jetting, and then the airflow is ejected in a spiral shape, which improves the uniformity of the airflow ejection and enhances the effect of water discharging, moisture removal and removal of fine beads on the inner wall of the extension tube. The spirally ejected airflow can also clean the filter to prevent EPS or EPP beads from clogging the filter mesh and improving the sensitivity of water vapor leak detection.

[0021] The plug drives the sealing ring to rotate, and each time the push rod blocks the extension tube, the angle of the sealing ring can be switched, so that the surrounding of the sealing ring can be evenly utilized, avoiding local wear around the sealing ring, thereby ensuring the sealing performance of the sealing ring and extending the service life of the sealing ring.

[0022] The present application utilizes the elastic force of the spring to perform buffering before the piston hits the buffer pad, thereby reducing the force of the piston hitting the buffer pad, extending the service life of the buffer pad, avoiding frequent replacement of the buffer pad, and thus improving the use efficiency of the mold. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 Shows an overall schematic diagram provided according to an embodiment of the present invention;

[0024] Figure 2 The embodiment of the present invention provides Figure 1 Enlarged view of point A in the middle;

[0025] Figure 3 A schematic cross-sectional view of a die according to an embodiment of the present invention is shown;

[0026] Figure 4 An exploded view of a delivery pipe according to an embodiment of the present invention is shown;

[0027] Figure 5 A schematic cross-sectional view of a cylinder provided in an embodiment of the present invention is shown;

[0028] Figure 6 The embodiment of the present invention provides Figure 5 Enlarged view of point B in the middle;

[0029] Figure 7 A schematic cross-sectional view of a separator tube provided in an embodiment of the present invention is shown;

[0030] Figure 8 The embodiment of the present invention provides Figure 7 Enlarged view of point C in the middle;

[0031] Figure 9 The embodiment of the present invention provides Figure 7 Enlarged view of point D in the middle;

[0032] Figure 10 A schematic diagram of the interior of a cylinder provided according to an embodiment of the present invention is shown;

[0033] Figure 11 The embodiment of the present invention provides Figure 10 Enlarged view of point E in the middle;

[0034] Figure 12 The embodiment of the present invention provides Figure 10 Enlarged view of point F in the middle;

[0035] Figure 13 The embodiment of the present invention provides Figure 10 Enlarged view of point G in the middle.

[0036] Legend:

[0037] 10. Punch; 11. Die; 12. Rack; 13. Gear; 14. Positioning rod; 15. Delivery pipe; 16. Cylinder; 17. Extension pipe; 18. Piston; 19. Push rod;

[0038] 20. Sealing mechanism; 21. Separating pipe; 22. Gas transmission assembly; 221. Fixed rod; 222. Movable plate; 223. One-way valve (1); 23. Closing assembly; 231. Closing plate; 232. Spring; 233. Internal connecting pipe; 234. One-way valve (2); 235. External connecting pipe; 24. Plug; 25. Sealing ring; 26. Buffer pad;

[0039] 30. Jet mechanism; 31. Connector; 32. One-way valve 3; 33. Airway; 34. One-way diaphragm; 35. Impeller;

[0040] 40. Leak detection unit; 41. Connecting pipe; 42. Temperature sensor; 43. Sealing ring; 44. Filter. DETAILED DESCRIPTION

[0041] The following, in conjunction with the accompanying drawings, provides a clear and complete description of the technology in the embodiments of the present invention, a double-layer energy-saving and high-efficiency mold for producing EPS and EPP products. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0042] like Figures 1-13 As shown, the present invention provides a double-layer energy-saving and high-efficiency mold for the production of EPS and EPP products: it includes a male mold 10 and two female molds 11 located on both sides of the male mold 10, a delivery pipe 15 is provided inside the female mold 11, and a feed branch pipe and an air intake branch pipe are provided at the top and bottom of the delivery pipe 15 respectively. The feed branch pipe is connected to the silo, and the air intake branch pipe is connected to the compressor. After the compressor introduces compressed air into the delivery pipe 15 through the air intake branch pipe, a negative pressure is generated in the delivery pipe 15 near the feed branch pipe. EPS beads enter the delivery pipe 15 under the action of gravity and negative pressure. A push rod 19 is slidably connected to the inside of the delivery pipe 15, and a cylinder barrel 16 and an extension pipe 17 are fixedly connected to both ends of the delivery pipe 15. The extension tube 17 is fixed to the die 11 by bolts and extends into the inside of the die 11. After the EPS beads enter the delivery tube 15, they are ejected from the extension tube 17 into the mold cavity between the punch 10 and the die 11 along with the air flow. One end of the push rod 19 is fixedly connected to a piston 18 slidably connected to the inside of the cylinder 16. The cylinder 16 is connected to an external compressor. By controlling the internal air pressure of the cylinder 16, the piston 18 and the push rod 19 are driven to slide back and forth inside the cylinder 16. After the EPS beads are delivered, the piston 18 and the push rod 19 are controlled to move toward the extension tube 17, so that the EPS or EPP beads remaining in the delivery tube 15 and the extension tube 17 are pushed out, and the delivery tube 15 and the extension tube 17 are blocked. The following also includes:

[0043] The sealing mechanism 20 includes a partition tube 21 fixedly connected to the inner wall of the push rod 19, and a chamber for air to pass through is left between the partition tube 21 and the push rod 19. An air delivery component 22 and a sealing component 23 are provided inside the partition tube 21. The air delivery component 22 includes a fixed rod 221 fixed to the inner wall of the cylinder 16 and a movable plate 222 fixed to one end of the fixed rod 221 and slidably connected to the interior of the partition tube 21. Since the movable plate 222 is fixed to the cylinder 16 by the fixed rod 221, when the piston 18 and the push rod 19 move together with the partition tube 21 toward the direction of the extension tube 17, the movable plate 222 moves relative to the partition tube 21 toward the direction of the sealing plate 231. A plug 24 is provided at one end of the push rod 19, and a sealing ring 25 is fixedly connected to the outside of the plug 24. An air hole is provided inside the plug 24, which connects the chamber between the push rod 19 and the separator tube 21 with the sealing ring 25, so that when the movable plate 222 slides inside the separator tube 21, it can push air into the sealing ring 25 through the chamber and the air hole, causing the sealing ring 25 to expand and seal between the plug 24 and the extension tube 17, thereby sealing the extension tube 17 and the plug 24, and preventing the water vapor from entering the extension tube 17 through the gap between the extension tube 17 and the plug 24 when the EPS beads are heated by water vapor, causing the beads to adhere to the inner wall of the extension tube 17 when the beads are transported again, thereby making the transportation of EPS or EPP beads smooth and preventing fine beads from squeezing into the space between the push rod 19 and the extension tube 17 under the action of viscosity, causing the movement of the push rod 19 to be obstructed or even stuck.

[0044] Reference Figure 7-12A one-way valve 223 is installed on the movable plate 222. Air can only enter the space where the one-way valve 32 is located inside the separator tube 21 through the one-way valve 223 from the space where the fixed rod 221 is located inside the separator tube 21. When the push rod 19 pushes the EPS or EPP beads, the movable plate 222 moves backward relative to the separator tube 21, that is, moves away from the plug 24. At this time, the air pressure on the side of the movable plate 222 near the fixed rod 221 inside the separator tube 21 increases, causing the one-way valve 223 to open under the air pressure, and air can pass through the one-way valve 223. At this time, the movement of the movable plate 222 cannot transport the air inside the separation tube 21. The sealing assembly 23 includes a sealing plate 231 and a spring 232 fixed between the sealing plate 231 and the extension tube 17. The separation tube 21 is fixedly connected with an internal connecting pipe 233 at a position between the sealing plate 231 and the piston 18. The position of the opening on the sealing plate 231 is staggered with the position of the one-way valve 223. When the movable plate 222 moves to contact the sealing plate 231, the sealing plate 231 closes the one-way valve 223. At this time, the movable plate 222 continues to move, driving the sealing plate 231 to move and push the sealing plate 231. The air in the movable separation tube 21 is made to pass through the internal communicating tube 233 and the chamber between the push rod 19 and the separation tube 21, and then enter the interior of the sealing ring 25 through the air hole of the plug 24, thereby expanding the sealing ring 25 to achieve a sealing effect. The purpose of this design is to make the sealing ring 25 expand after the push rod 19 blocks the extension tube 17, so as to avoid the sealing ring 25 expanding first and rubbing against the inner wall of the extension tube 17 when moving with the plug 24 and the push rod 19, thereby protecting the sealing ring 25 and reducing the resistance encountered by the push rod 19 and the piston 18 when they move. A one-way valve 234 communicating with the interior of the cylinder 16 is installed inside 18, and an external communicating pipe 235 communicating with the interior of the cylinder 16 is fixedly connected to the bottom of the delivery pipe 15. When the piston 18 and the push rod 19 are reset, the movable plate 222 moves forward relative to the separation tube 21. At this time, the one-way valve 1 223 is in a closed state, and the air pressure in the space where the fixed rod 221 is located inside the separation tube 21 is reduced, so that the one-way valve 234 opens under the action of air pressure, and the outside air enters the interior of the separation tube 21 through the external communicating pipe 235 and the one-way valve 234, thereby realizing automatic inflation.

[0045] A buffer pad 26 is provided at the connection between the delivery pipe 15 and the cylinder 16. The buffer pad 26 is used to buffer the piston 18 when the piston 18 moves to the end of the push rod 19, thereby reducing the impact force on the piston 18. When the existing material gun is in use, the buffer pad 26 will be compacted due to continuous impact, resulting in a smaller thickness, so that when the piston 18 moves to the end of the cylinder 16, the push rod 19 will protrude from the end of the extension tube 17, resulting in holes in the molded EPS or EPP product. Therefore, the buffer pad 26 needs to be replaced regularly. In the present application, when the push rod 19 is pushed out, the movable plate 222 contacts the closing plate 231 to compress the spring 232, and then the piston 18 contacts the buffer pad 26. In this process, the spring 232 is first used to buffer the piston 18, and then the buffer pad 26 is used for secondary buffering, thereby reducing the impact force on the buffer pad 26, thereby extending the service life of the buffer pad 26, extending the time interval for replacing the buffer pad 26, and improving the use effect of the mold.

[0046] Reference Figure 8The jet mechanism 30 is used to control the ejection of air. The jet mechanism 30 includes a connector 31 that is rotatably connected to the interior of the separation tube 21 and fixed to the plug 24. A one-way valve 32 is installed inside the connector 31. The one-way valve 32 is used to allow air to enter the plug 24 from the interior of the separation tube 21 in one direction. Therefore, when the push rod 19 is extended to push the EPS or EPP beads, when the movable plate 222 moves relative to the separation tube 21 in a direction away from the plug 24, external air will not enter the separation tube through the one-way valve 32. 21, the inside of the plug 24 is provided with an air passage 33 with an inclined outlet, and a one-way membrane flap 34 is fixedly arranged inside the air passage 33. The one-way membrane flap 34 is used to close the plug 24 to prevent water vapor from entering the plug 24 through the air passage 33 during the heating process. When the piston 18 and the push rod 19 retract, that is, when they move backward, the movable plate 222 moves relative to the gas delivery component 22 toward the plug 24. At this time, the one-way valve 1 223 is in a closed state, and the one-way valve 3 32 inside the separator tube 21 is closed. The pressure in the space increases, causing the one-way valve 32 to open under air pressure, and the air inside the separation tube 21 enters the plug 24 through the one-way valve 32 and is ejected through the air channel 33, so that the air flow is ejected from the inside of the extension tube 17, preventing the residual water vapor inside the die 11 from being sucked into the conveying pipe 15 when the push rod 19 retracts, causing the water vapor to enter the feed branch pipe and make the beads damp. At the same time, it can also flush out the residual water in the gap around the plug 24 after the EPS product is demoulded, preventing water from flowing into the extension tube 17. The internal solidification of the plug 24 An impeller 35 is fixedly connected. When the airflow passes through the inside of the plug 24, it pushes the blades of the impeller 35, driving the impeller 35 to rotate, and the impeller 35 drives the plug 24 to rotate, so that the airflow can be spirally ejected through the air channel 33, thereby improving the uniformity of air ejected from the extension tube 17 and further enhancing the waterproof effect. In addition, the sealing ring 25 can rotate with the plug 24, switching the angle of the sealing ring 25, so that the sealing ring 25 is evenly worn around when used for a long time, thereby improving the sealing effect of the sealing ring 25 and extending its service life.

[0047] Reference Figure 10 and Figure 13In the existing material gun, only the sealing ring 43 is used to prevent water vapor leakage, which is difficult to ensure the waterproof effect. In order to detect water vapor leakage before the water vapor enters the feed branch of the delivery pipe 15 and ensure that the EPS or EPP beads in the material gun will not be damp and agglomerated, a leakage detection unit 40 is also included. The leakage detection unit 40 includes a connecting pipe 41 fixedly connected to the extension pipe 17, and a temperature sensor 42 is installed inside the connecting pipe 41. A sealing ring 43 is provided at the connection between the delivery pipe 15 and the extension pipe 17. The interior of the connecting pipe 41 is fixedly connected to prevent the EPS or EPP beads from clogging the connection. When the push rod 19 blocks the extension tube 17, the filter 44 of the tube 41 expands the sealing ring 25 to seal the extension tube 17 and the push rod 19. At this time, water vapor will not enter the extension tube 17. After the sealing ring 25 wears out and the seal fails, water vapor will enter between the extension tube 17 and the push rod 19 and contact the temperature sensor 42 through the connecting tube 41. The temperature sensor 42 detects whether the water vapor has leaked. At this time, the sealing ring 43 seals the extension tube 17 and the push rod 19. Therefore, when water vapor leakage is detected, the water vapor has not yet entered the silo, so that timely response can be made.

[0048] It is worth mentioning that the surface of the filter 44 can be cleaned during the process of air being ejected from the air duct 33 to prevent EPS or EPP beads from clogging the mesh of the filter 44. The plug 24 rotates to cause the air to be ejected in a spiral, which can also change the direction of the airflow and enhance the airflow's unblocking effect on the filter 44.

[0049] Reference Figure 1 、 Figure 2 and Figure 3 , both sides of the punch 10 are rotatably connected with gears 13, and the outer side of each gear 13 is meshed with two racks 12 fixed to the two dies 11 respectively. When one of the dies 11 is moved away, a rack 12 fixed on the die 11 drives the gear 13 to rotate, so that the gear 13 drives the other rack 12 to move, so that the other die 11 is synchronously reversed, thereby realizing the synchronous opening or closing of the two dies 11, making the production of EPS and EPP products more efficient. The opposite sides of the two dies 11 are fixedly connected with positioning rods 14 slidingly connected to the punch 10, which is used to keep the punch 10 and the die 11 aligned.

[0050] Working principle: In the initial state, the push rod 19 and the piston 18 are in the retracted state. The compressed air is introduced into the cylinder 16 through the external compressor to drive the piston 18 and the push rod 19 to move toward the extension tube 17. The push rod 19 drives the separation tube 21 to move, so that the movable plate 222 moves relative to the separation tube 21 in the direction away from the extension tube 17. At this time, the air pressure in the space where the fixed rod 221 is located inside the separation tube 21 increases, and the one-way valve 223 opens under the air pressure. The air can pass through the one-way valve 223, so the movement of the movable plate 222 cannot push the air inside the separation tube 21 to pressurize and expand the sealing ring 25. When the plate 222 moves to contact the closing plate 231, the push rod 19 is about to completely block the extension tube 17. The closing plate 231 and the movable plate 222 are in contact with the one-way valve 1 223, and the one-way valve 234 is in a closed state. The movable plate 222 continues to move, driving the closing plate 231 to move and push the air inside the separation tube 21. After passing through the internal connecting tube 233 and the chamber between the push rod 19 and the separation tube 21, the air enters the sealing ring 25 through the air hole of the plug 24, causing the sealing ring 25 to expand and seal between the plug 24 and the extension tube 17, thereby preventing water vapor from entering the gap between the push rod 19 and the extension tube 17.

[0051] When the air in the cylinder 16 is extracted by the external compressor to reset the piston 18 and the push rod 19, the movable plate 222 moves relative to the separation tube 21 toward the plug 24. At this time, the one-way valve 1 223 is in a closed state. The movement of the movable plate 222 reduces the air pressure in the space where the fixed rod 221 is located in the separation tube 21. The one-way valve 234 opens under the action of the air pressure, and the outside air enters the separation tube 21 through the external connecting pipe 235 and the one-way valve 234, realizing automatic inflation. The air pressure in the space where the one-way valve 32 is located in the separation tube 21 increases. The one-way valve 32 opens under the action of the air pressure, and the air enters the plug 24 from the separation tube 21 through the one-way valve 32. Then, the one-way membrane 34 is opened through the air channel 33 and ejected into the extension tube 17. Then, the air flow is ejected from the extension tube 17 to prevent the push rod 19 from retracting and sucking the humid air into the extension tube 17.

[0052] When the airflow enters the plug 24, it pushes the blades of the impeller 35, causing the impeller 35 to rotate with the plug 24, so that the air is ejected in a spiral form, thereby improving the uniformity of the air inside the extension tube 17. The airflow can also clean the fine beads adhering to the filter 44 and the inner wall of the extension tube 17, so that the beads can be fully utilized and the filter 44 can be prevented from being blocked.

[0053] The above is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field within the technical scope disclosed by the present invention can replace or change the double-layer energy-saving and high-efficiency mold for the production of EPS and EPP products and its inventive concept according to the technology of the present invention, which should be covered by the scope of protection of the present invention.

Claims

1. A double-layer energy-saving and high-efficiency mold for the production of EPS and EPP products, comprising a male mold (10) and a female mold (11), wherein a delivery pipe (15) is provided inside the female mold (11), a push rod (19) is slidably connected to the inside of the delivery pipe (15), and the two ends of the delivery pipe (15) are respectively fixedly connected to a cylinder (16) and an extension pipe (17), and one end of the push rod (19) is fixedly connected to a piston (18), characterized in that: Also includes: A sealing mechanism (20), the sealing mechanism (20) comprising a separation tube (21) fixedly connected to the inner wall of the push rod (19), an air delivery assembly (22) and a sealing assembly (23) being provided inside the separation tube (21), the air delivery assembly (22) comprising a fixed rod (221) fixed to the cylinder (16) and a movable plate (222) fixed to one end of the fixed rod (221), a plug (24) being provided at one end of the push rod (19), and a sealing ring (25) being fixedly connected to the outside of the plug (24); A one-way valve (223) is installed on the movable plate (222), the closing assembly (23) includes a closing plate (231) and a spring (232) fixed between the closing plate (231) and the extension tube (17), an internal connecting tube (233) is fixedly connected to the separating tube (21) at a position between the closing plate (231) and the piston (18), the opening position on the closing plate (231) is staggered with the one-way valve (223), and when the movable plate (222) moves to contact the closing plate (231), the closing plate (231) closes the one-way valve (223); A second one-way valve (234) communicating with the interior of the cylinder (16) is installed inside the piston (18), and an external communication pipe (235) communicating with the interior of the cylinder (16) is fixedly connected to the bottom of the delivery pipe (15); An air jet mechanism (30) for controlling the ejection of air flow, the air jet mechanism (30) comprising a connecting member (31) rotatably connected to the interior of the separation tube (21) and fixed to the plug (24), a one-way valve (32) being installed inside the connecting member (31), an air passage (33) with an inclined outlet being provided inside the plug (24), and a one-way membrane flap (34) being fixedly arranged inside the air passage (33); The plug (24) is fixedly connected to an impeller (35) inside, and when airflow passes through the plug (24), it pushes the blades of the impeller (35), driving the impeller (35) to rotate; The device further comprises a leakage detection unit (40), the leakage detection unit (40) comprising a connecting tube (41) fixedly connected to the extension tube (17), a temperature sensor (42) being installed inside the connecting tube (41), a sealing ring (43) being provided at the connection between the delivery tube (15) and the extension tube (17), and a filter disc (44) being fixedly connected inside the connecting tube (41); After the push rod (19) blocks the extension tube (17), the sealing ring (25) is inflated to seal the extension tube (17). When the push rod (19) retracts, air is ejected from the extension tube (17) through the sealing component (23) and the jet mechanism (30).

2. A double-layer energy-saving and high-efficiency mold for producing EPS and EPP products according to claim 1, characterized in that: A buffer pad (26) is provided at the connection between the delivery pipe (15) and the cylinder (16). When the push rod (19) is pushed out, the movable plate (222) contacts the closing plate (231) to compress the spring (232), and then the piston (18) contacts the buffer pad (26).

3. A double-layer energy-saving and high-efficiency mold for producing EPS and EPP products according to claim 1, characterized in that: Both sides of the male mold (10) are rotatably connected to gears (13), and the outer side of each gear (13) is meshedly connected to two racks (12) respectively fixed to the two female molds (11). The opposite sides of the two female molds (11) are fixedly connected to positioning rods (14) slidably connected to the male mold (10), and the extension tube (17) is fixed to the female mold (11) and extends to the inside of the female mold (11).

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