Double-layer energy-saving efficient mold for EPS and EPP product production

Abstract

The invention discloses a double-layer energy-saving efficient die for EPS and EPP product production, and relates to the technical field of foam processing.The double-layer energy-saving efficient die comprises a male die and a female die, a conveying pipe is arranged in the female die, a push rod is slidably connected into the conveying pipe, the two ends of the conveying pipe are fixedly connected with a cylinder barrel and an extension pipe respectively, and one end of the push rod is fixedly connected with a piston; the sealing mechanism comprises a separation pipe fixedly connected to the inner wall of the push rod, a gas transmission assembly and a sealing assembly are arranged in the separation pipe, the gas transmission assembly comprises a fixed rod fixed to the cylinder barrel and a movable plate fixed to one end of the fixed rod, a plug is arranged at one end of the push rod, and a sealing ring is fixedly connected to the outer portion of the plug; the gap between the plug and the extension pipe is sealed by inflating and expanding the sealing ring, so that water vapor is effectively prevented from entering the gap between the extension pipe and the push rod when the EPS or EPP beads are heated by introducing the water vapor after die assembly, and the EPS beads are smoothly discharged along with airflow.

Description

Technical Field

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

[0002] Expanded polystyrene (EPS) and expanded polypropylene (EPP) are two common foaming materials, which are widely used in many fields such as packaging, construction, and automobiles. The traditional molds for the production of EPS and EPP products mainly consist of a female mold, a male mold, and a material gun. After the mold is closed, the pre-treated EPS or EPP beads are conveyed into the mold cavity between the female mold and the male mold by the material gun. Then, steam is introduced into the mold to heat the beads, causing them to expand again and fill the mold cavity. Finally, cooling water is introduced to cool and shape the expanded material, and then demolding is carried out.

[0003] The material gun on the EPS mold consists of a conveying pipe and a piston push rod. The conveying pipe is provided with a feeding branch pipe connected to the material bin and an air inlet branch pipe connected to the compressor. When the compressor passes compressed air into the interior of the conveying pipe through the air inlet branch pipe, a negative pressure will be formed near the connection between the feeding branch pipe and the conveying pipe under the action of the high-speed air flow. As a result, the EPS beads in the material bin enter the conveying pipe through the feeding branch pipe under the negative pressure and are sprayed out of the end of the conveying pipe into the mold cavity together with the compressed air. After the bead conveying is completed, the piston push rod is controlled to move to push out the remaining beads in the conveying pipe and seal the conveying pipe.

[0004] In order to prevent the water vapor inside the mold cavity from entering the material bin through the gap between the conveying pipe and the piston push rod and then through the feeding branch pipe during the production of EPS or EPP products, which may cause the material to become damp, sticky, and caked, a sealing ring needs to be installed between the conveying pipe and the piston push rod. However, after the piston push rod seals the conveying pipe, water vapor will still enter the space between the conveying pipe and the piston push rod. When the EPS beads pass through the conveying pipe, the water on the inner wall of the conveying pipe will contact 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 material discharge. Moreover, when the bead diameter is small or there are fine beads, during the pushing process of the piston push rod, the beads are easily drawn into the space between the piston push rod and the conveying pipe under the viscous action of water, and then the beads expand due to heat, causing the conveying pipe to be 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 that water vapor enters 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 in the process of the piston push rod being pushed out, the beads are easily entered 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 be 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] In order to achieve the above-mentioned purpose, the present invention adopts the following technology: a double-layer energy-saving and efficient mold for the production of EPS and EPP products: comprising a male mold and a female mold, a delivery pipe is arranged inside the female mold, a push rod is slidably connected inside 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, wherein the sealing mechanism comprises a separation tube fixedly connected to the inner wall of the push rod, wherein a gas delivery component and a sealing component are arranged inside the separation tube, wherein the gas delivery component comprises a fixed rod fixed to the cylinder barrel and a movable plate fixed to one end of the fixed rod, wherein a plug is arranged at one end of the push rod, and a sealing ring is fixedly connected to the outside of the plug;

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

[0009] After the push rod blocks the extension tube, the sealing ring is inflated to seal the extension tube, and when the push rod is retracted, 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 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 from the position of the one-way valve, and when the movable plate moves to contact with the closing plate, the closing plate closes the one-way valve.

[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 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 inside the plug. When the air flow passes through the inside 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, after the movable plate contacts the closing plate and compresses the spring, the piston then contacts the buffer pad.

[0015] As a further description of the above technical solution: It further includes a leakage detection unit. The leakage detection unit includes a connecting pipe fixedly connected to the extension pipe. A temperature sensor is installed inside the connecting pipe. A sealing ring is provided at the connection between the delivery pipe and the extension pipe. A filter disc is fixedly connected inside the connecting pipe.

[0016] As a further description of the above technical solution: Gears are rotatably connected to both sides of the punch. Two racks respectively fixed to the two female dies are meshed on the outside of each gear. Positioning rods slidably connected to the punch are fixedly connected to the opposite sides of the two female dies. The extension pipe is fixed to the female die and extends into the female die.

[0017] In summary, due to the adoption of the above technology, for a double-layer energy-saving and high-efficiency mold for EPS and EPP product production, the beneficial effects of the present invention are:

[0018] After the push rod of this application pushes out EPS or EPP beads and plugs the delivery pipe and the extension pipe, the sealing ring is inflated to seal the gap between the plug and the extension pipe, effectively preventing water vapor from entering the gap between the extension pipe and the push rod when water vapor is introduced to heat EPS or EPP beads after the mold is closed. Thus, the situation where EPS beads adhere to the inner wall of the extension pipe after being wetted by water is eliminated, enabling the EPS beads to be smoothly discharged with the air flow, ensuring the working efficiency of the material gun and the uniformity of the discharged material. In addition, it can also prevent fine beads from being wetted by water and squeezing into the gap between the push rod and the extension pipe under the action of viscosity, resulting in the obstruction or even jamming of the movement of the push rod, and ensuring the continuous and normal production of EPS or EPP products.

[0019] Moreover, the temperature sensor can detect the leakage of water vapor, promptly repair or replace the material gun. And under the double sealing of the sealing ring and the sealing washer, the leaked water vapor will not enter the material bin through the feed branch pipe of the delivery pipe, thus ensuring the safety of the material bin, avoiding the EPS beads from absorbing water and caking near the feed branch pipe and blocking, and ensuring the continuity of production.

[0020] When the push rod retracts, through the relative movement of the movable plate and the partition pipe, the air inside the partition pipe is ejected through the air duct, generating an outward airflow in the extension pipe, blowing out the residual water around the plug, and preventing the moisture inside the female mold from being sucked into the extension pipe due to the retraction of the push rod, further ensuring the dryness of the inner wall of the extension pipe, improving the feeding effect of EPS or EPP beads. Moreover, the airflow can also act on the fine beads adhering to the inner wall of the extension pipe under the extrusion of the push rod, separating this part of the beads from the extension pipe, making full use of the beads while preventing the push rod from being blocked during operation. In addition, through the impeller, the plug can rotate during jetting, and then the airflow is ejected in a spiral shape, improving the uniformity of the airflow ejection, enhancing the effects of water drainage, moisture removal, and removing the fine beads on the inner wall of the extension pipe. The spiral ejected airflow can also clean the filter disc, preventing EPS or EPP beads from blocking the mesh holes of the filter disc, and improving the sensitivity of water vapor leakage detection.

[0021] When the plug drives the sealing ring to rotate, it can switch the angle of the sealing ring every time the push rod seals the extension pipe, enabling the periphery of the sealing ring to be evenly utilized, preventing 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] This application utilizes the elastic force of the spring to buffer before the piston impacts the buffer pad, reducing the impact force of the piston on 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 Shows provided according to an embodiment of the present invention Figure 1 Enlarged view at A in;

[0025] Figure 3 Shows a schematic cross-sectional view of the female mold provided according to an embodiment of the present invention;

[0026] Figure 4 Shows an exploded view of the delivery pipe provided according to an embodiment of the present invention;

[0027] Figure 5 Shows a schematic cross-sectional view of the cylinder barrel provided according to an embodiment of the present invention;

[0028] Figure 6 Shows provided according to an embodiment of the present invention Figure 5 Enlarged view at B in;

[0029] Figure 7 Shows a schematic cross-sectional view of the partition pipe provided according to an embodiment of the present invention;

[0030] Figure 8 Shows the enlarged view at position C in Figure 7 ;

[0031] Figure 9 Shows the enlarged view at position D in Figure 7 ;

[0032] Figure 10 Shows the schematic diagram of the interior of the cylinder barrel provided according to an embodiment of the present invention;

[0033] Figure 11 Shows the enlarged view at position E in Figure 10 ;

[0034] Figure 12 Shows the enlarged view at position F in Figure 10 ;

[0035] Figure 13 Shows the enlarged view at position G in Figure 10 ;

[0036] Legend description:

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

[0038] 20. Sealing mechanism; 21. Separation pipe; 22. Gas transmission assembly; 221. Fixed rod; 222. Movable plate; 223. Check valve one; 23. Sealing assembly; 231. Sealing plate; 232. Spring; 233. Inner communication pipe; 234. Check valve two; 235. Outer communication pipe; 24. Plug; 25. Sealing ring; 26. Buffer pad;

[0039] 30. Jet mechanism; 31. Connecting piece; 32. Check valve three; 33. Air passage; 34. One-way diaphragm; 35. Impeller;

[0040] 40. Leakage detection unit; 41. Connecting pipe; 42. Temperature sensor; 43. Sealing ring; 44. Filter disc. Detailed implementation manners

[0041] Next, the technical solution of a double-layer energy-saving and high-efficiency mold for EPS and EPP product production in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0042] As Figures 1-13 shown, a double - layer energy - saving and high - efficiency mold for EPS and EPP product production provided by the present invention includes a punch 10 and two female dies 11 respectively located on both sides of the punch 10. A conveying pipe 15 is arranged inside the female die 11. Feed branches and air - inlet branches are respectively arranged at the top and bottom of the conveying pipe 15. The feed branch is communicated with a material bin, and the air - inlet branch is communicated with a compressor. After the compressor passes compressed air into the inside of the conveying pipe 15 through the air - inlet branch, a negative pressure is generated at the position near the feed branch inside the conveying pipe 15. EPS beads enter the inside of the conveying pipe 15 under the action of gravity and negative pressure. A push rod 19 is slidably connected inside the conveying pipe 15. Cylinder barrels 16 and extension pipes 17 are respectively fixedly connected to both ends of the conveying pipe 15. The extension pipe 17 is fixed to the female die 11 by bolts and extends into the inside of the female die 11. After the EPS beads enter the inside of the conveying pipe 15, they are ejected from the extension pipe 17 along with the air flow into the mold cavity between the punch 10 and the female die 11. One end of the push rod 19 is fixedly connected with a piston 18 slidably connected inside the cylinder barrel 16. The cylinder barrel 16 is connected to an external compressor. By controlling the air pressure inside the cylinder barrel 16, the piston 18 and the push rod 19 slide back and forth inside the cylinder barrel 16. After the EPS bead conveying is completed, by controlling the piston 18 and the push rod 19 to move towards the direction of the extension pipe 17, the remaining EPS or EPP beads in the conveying pipe 15 and the extension pipe 17 are pushed out, and the conveying pipe 15 and the extension pipe 17 are blocked. It also includes:

[0043] Sealing mechanism 20, the sealing mechanism 20 includes a partition pipe 21 fixedly connected to the inner wall of the push rod 19. There is a chamber for air passage between the partition pipe 21 and the push rod 19. An air delivery component 22 and a closing component 23 are arranged inside the partition pipe 21. The air delivery component 22 includes a fixed rod 221 fixed to the inner wall of the cylinder barrel 16 and a movable plate 222 fixed to one end of the fixed rod 221 and slidably connected to the inside of the partition pipe 21. Since the movable plate 222 is fixed to the cylinder barrel 16 through the fixed rod 221, when the piston 18, the push rod 19 and the partition pipe 21 move in the direction of the extension pipe 17, the movable plate 222 moves relative to the partition pipe 21 in the direction of the closing plate 231. One end of the push rod 19 is provided with a plug 24, and a sealing ring 25 is fixedly connected to the outside of the plug 24. An air hole is opened inside the plug 24, and the air hole communicates the chamber between the push rod 19 and the partition pipe 21 with the sealing ring 25, so that when the movable plate 222 slides inside the partition pipe 21, air can be pushed into the sealing ring 25 through the chamber and the air hole, causing the sealing ring 25 to expand and block between the plug 24 and the extension pipe 17, sealing between the extension pipe 17 and the plug 24, and avoiding steam from entering the inside of the extension pipe 17 through the gap between the extension pipe 17 and the plug 24 when heating EPS beads with steam. When beads are conveyed again, the beads are wetted and adhere to the inner wall of the extension pipe 17, so that the EPS or EPP beads are conveyed smoothly and prevent fine beads from being squeezed into the space between the push rod 19 and the extension pipe 17 under the action of viscosity, resulting in the movement of the push rod 19 being blocked or even jammed.

[0044] Refer to Figures 7-12, a check valve one 223 is installed on the movable plate 222. Air can only enter the space where the check valve three 32 is located inside the partition tube 21 from the space where the fixed rod 221 is located inside the partition tube 21 through the check valve one 223. When the push rod 19 pushes the EPS or EPP beads, the movable plate 222 moves backward relative to the partition tube 21, that is, when moving away from the plug 24, at this time, the air pressure on the side of the movable plate 222 close to the fixed rod 221 inside the partition tube 21 increases, causing the check valve one 223 to open under the air pressure, and air can pass through the check valve one 223. Therefore, the movement of the movable plate 222 at this time cannot transport the air inside the partition 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. An inner communication tube 233 is fixedly connected to the partition tube 21 at a position between the sealing plate 231 and the piston 18. The position of the hole on the sealing plate 231 is staggered from the position of the check valve one 223. When the movable plate 222 moves to contact the sealing plate 231, the sealing plate 231 closes the check valve one 223. At this time, the movable plate 222 continues to move to drive the sealing plate 231 to move and push the air inside the partition tube 21, so that the air passes through the inner communication tube 233 and the chamber between the push rod 19 and the partition tube 21, and then enters the inside of the sealing ring 25 through the air hole of the plug 24, and then the sealing ring 25 expands to achieve the sealing effect. The purpose of this design is to make the sealing ring 25 expand after the push rod 19 plugs the extension tube 17, avoiding 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. While achieving the effect of protecting the sealing ring 25, it can also reduce the resistance when the push rod 19 and the piston 18 move. A check valve two 234 communicating with the inside of the cylinder barrel 16 is installed inside the piston 18. The bottom of the conveying pipe 15 is fixedly connected with an outer communication tube 235 communicating with the inside of the cylinder barrel 16. When the piston 18 and the push rod 19 are reset, the movable plate 222 moves forward relative to the partition tube 21. At this time, the check valve one 223 is in the closed state, and the air pressure in the space where the fixed rod 221 is located inside the partition tube 21 decreases, causing the check valve two 234 to open under the action of the air pressure, and the outside air enters the inside of the partition tube 21 through the outer communication tube 235 and the check valve two 234 to achieve automatic inflation.

[0045] A buffer pad 26 is provided at the connection between the delivery pipe 15 and the cylinder barrel 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, reducing the impact force on the piston 18. When the existing material gun is in use, the buffer pad 26 will be compacted in thickness due to continuous impacts, resulting in a decrease in thickness. When the piston 18 moves to the end of the cylinder barrel 16, the push rod 19 will protrude from the end of the extension pipe 17, causing holes to form in the formed EPS or EPP products. Therefore, the buffer pad 26 needs to be replaced regularly. In this application, when the push rod 19 is pushed out, after the movable plate 222 contacts the closing plate 231 and compresses the spring 232, the piston 18 then contacts the buffer pad 26. In this process, the spring 232 is first used to buffer the piston 18, and then secondary buffering is carried out through the buffer pad 26, 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] Refer to Figure 8, a jetting mechanism 30 for controlling the ejection of air flow. The jetting mechanism 30 includes a connecting member 31 rotatably connected inside the partition pipe 21 and fixed to the plug 24. A check valve three 32 is installed inside the connecting member 31. The check valve three 32 is used to allow air to enter the inside of the plug 24 unidirectionally from the inside of the partition pipe 21. Therefore, when the push rod 19 extends to push the EPS or EPP beads, when the movable plate 222 moves away from the plug 24 relative to the partition pipe 21, external air will not enter the inside of the partition pipe 21 through the check valve three 32. An air passage 33 with an inclined outlet is provided inside the plug 24, and a check membrane flap 34 is fixedly arranged inside the air passage 33. The check membrane flap 34 is used to seal the plug 24 to prevent water vapor from entering the inside of the plug 24 through the air passage 33 during the heating of the beads. When the piston 18 and the push rod 19 retract, that is, move backward, the movable plate 222 moves toward the plug 24 relative to the air delivery assembly 22. At this time, the check valve one 223 is in the closed state, and the pressure in the space where the check valve three 32 is located inside the partition pipe 21 increases, causing the check valve three 32 to open under the air pressure. The air inside the partition pipe 21 enters the plug 24 through the check valve three 32 and is ejected through the air passage 33, so that the air flow is ejected from the inside of the extension pipe 17, preventing the residual water vapor inside the female mold 11 from being sucked into the inside of the delivery pipe 15 when the push rod 19 retracts, resulting in the water vapor entering the feed branch pipe and causing the beads to be affected by moisture. At the same time, after the EPS product is demolded, the residual water in the gap around the plug 24 can be flushed out, preventing the water from flowing into the inside of the extension pipe 17. A impeller 35 is fixedly connected inside the plug 24. When the air flow passes through the inside of the plug 24, it pushes the blades of the impeller 35, driving the impeller 35 to rotate, so that the impeller 35 drives the plug 24 to rotate, enabling the air flow to be ejected spirally through the air passage 33, improving the uniformity of the air ejected from the extension pipe 17, further enhancing the waterproof effect, and the sealing ring 25 can rotate along with the plug 24, switching the angle of the sealing ring 25, so that the sealing ring 25 is evenly worn around during long-term use, improving the sealing effect of the sealing ring 25 and extending its service life.

[0047] Refer to Figure 10 and Figure 13, in the existing material gun, only the sealing ring 43 is used to prevent water vapor leakage, and it is difficult to ensure the waterproof effect. In order to detect water vapor leakage before the water vapor enters the feed branch pipe of the conveying pipe 15 and ensure that the EPS or EPP beads in the material gun will not be affected by moisture and caking, a leakage detection unit 40 is further included. The leakage detection unit 40 includes a connecting pipe 41 fixedly connected to the extension pipe 17. A temperature sensor 42 is installed inside the connecting pipe 41. A sealing ring 43 is provided at the connection between the conveying pipe 15 and the extension pipe 17. A filter disc 44 for preventing EPS or EPP beads from blocking the connecting pipe 41 is fixedly connected inside the connecting pipe 41. When the push rod 19 blocks the extension pipe 17, the extension pipe 17 and the push rod 19 are sealed by the expansion of the sealing ring 25. At this time, water vapor will not enter the inside of the extension pipe 17. After the sealing fails due to the wear of the sealing ring 25, water vapor will enter between the extension pipe 17 and the push rod 19 and contact the temperature sensor 42 through the connecting pipe 41. The temperature sensor 42 is used to detect whether water vapor leaks. At this time, the sealing ring 43 seals between the extension pipe 17 and the push rod 19. Therefore, when water vapor leakage is detected, the water vapor has not yet entered the silo, so that corresponding measures can be taken in time.

[0048] It is worth mentioning that during the process of air spraying out from the air duct 33, the surface of the filter disc 44 can also be cleaned to prevent EPS or EPP beads from blocking the mesh holes of the filter disc 44. Moreover, when the plug 24 rotates to make the air spray out in a spiral shape, the air flow direction can also be changed, strengthening the dredging effect of the air flow on the filter disc 44.

[0049] Refer to Figure 1 , Figure 2 and Figure 3 , gears 13 are rotatably connected to both sides of the punch 10. Two racks 12 respectively fixed to the two female dies 11 are meshed with the outside of each gear 13. When controlling one of the female dies 11 to move away, one of the racks 12 fixed to the female die 11 drives the gear 13 to rotate, so that the gear 13 drives the other rack 12 to move, and the other female die 11 moves synchronously in the opposite direction, thereby realizing the synchronous opening or closing of the two female dies 11, making the production of EPS and EPP products more efficient. Positioning rods 14 slidably connected to the punch 10 are fixedly connected to the opposite sides of the two female dies 11 for keeping the punch 10 and the female dies 11 aligned.

[0050] Working principle: In the initial state, the push rod 19 and the piston 18 are in the retracted state. Compressed air is introduced into the cylinder 16 by an external compressor, driving the piston 18 and the push rod 19 to move towards the extension pipe 17. The push rod 19 drives the partition pipe 21 to move, causing the movable plate 222 to move relative to the partition pipe 21 in a direction away from the extension pipe 17. At this time, the air pressure in the space where the fixed rod 221 is located inside the partition pipe 21 increases, and the first one-way valve 223 opens under the air pressure. Air can pass through the first one-way valve 223. Therefore, the movement of the movable plate 222 cannot push the air inside the partition pipe 21 to pressurize and expand the sealing ring 25. When the movable plate 222 moves to contact the closing plate 231, at this time, the push rod 19 is about to completely block the extension pipe 17. The closing plate 231 fits with the movable plate 222 to close the first one-way valve 223, and the second one-way valve 234 is in the closed state. The movable plate 222 continues to move, driving the closing plate 231 to move and push the air inside the partition pipe 21. After the air passes through the inner communication pipe 233 and the chamber between the push rod 19 and the partition pipe 21, it 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 pipe 17, preventing water vapor from entering the gap between the push rod 19 and the extension pipe 17;

[0051] When the external compressor extracts the air inside the cylinder 16 to reset the piston 18 and the push rod 19, the movable plate 222 moves relative to the partition pipe 21 towards the plug 24. At this time, the first one-way valve 223 is in the closed state. The movement of the movable plate 222 reduces the air pressure in the space where the fixed rod 221 is located inside the partition pipe 21. The second one-way valve 234 opens under the action of the air pressure. External air enters the inside of the partition pipe 21 through the external communication pipe 235 and the second one-way valve 234 to achieve automatic inflation. The air pressure in the space where the third one-way valve 32 is located inside the partition pipe 21 increases, and the third one-way valve 32 opens under the action of the air pressure. Air enters the plug 24 from the inside of the partition pipe 21 through the third one-way valve 32, and then opens the one-way diaphragm 34 through the air passage 33 and sprays it into the extension pipe 17. After that, the air flow sprays out from the extension pipe 17, preventing the push rod 19 from retracting and sucking humid air into the inside of the extension pipe 17;

[0052] When the air flow enters the inside of the plug 24, it pushes the blades of the impeller 35, causing the impeller 35 to drive the plug 24 to rotate, so that the air sprays out in a spiral form, improving the uniformity of the air inside the extension pipe 17. The air flow can also clean the fine beads adhered to the filter element 44 and the inner wall of the extension pipe 17, making full use of the beads and preventing the filter element 44 from being blocked.

[0053] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical concept of the present invention, makes equivalent substitutions or changes to an EPS and EPP product production double-layer energy-saving and high-efficiency mold, and should be covered by the protection scope 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 arranged inside the female mold (11), a push rod (19) is slidably connected inside the delivery pipe (15), two ends of the delivery pipe (15) are respectively fixedly connected to a cylinder (16) and an extension pipe (17), 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 partition tube (21) fixedly connected to the inner wall of the push rod (19), an air delivery component (22) and a sealing component (23) being arranged inside the partition tube (21), the air delivery component (22) comprising a fixed rod (221) fixed to the cylinder barrel (16) and a movable plate (222) fixed to one end of the fixed rod (221), a plug (24) being arranged at one end of the push rod (19), and a sealing ring (25) being fixedly connected to the outside of the plug (24); An injection mechanism (30) for controlling the ejection of air flow; 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 one-way valve (223) is installed on the movable plate (222); the closing assembly (23) comprises a closing plate (231) and a spring (232) fixed between the closing plate (231) and the extension tube (17); an inner connecting tube (233) is fixedly connected to the separating tube (21) at a position between the closing plate (231) and the piston (18); the position of the opening on the closing plate (231) is staggered from the position of the one-way valve (223); when the movable plate (222) moves to contact the closing plate (231), the closing plate (231) closes the one-way valve (223).

3. A double-layer energy-saving and high-efficiency mold for producing EPS and EPP products according to claim 2, characterized in that: 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).

4. The double-layer energy-saving and high-efficiency mold for producing EPS and EPP products according to claim 1, characterized in that: The jet mechanism (30) comprises a connecting piece (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 piece (31), an air passage (33) with an inclined outlet being arranged inside the plug (24), and a one-way membrane flap (34) being fixedly arranged inside the air passage (33).

5. The double-layer energy-saving and high-efficiency mold for producing EPS and EPP products according to claim 1, characterized in that: 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), thereby driving the impeller (35) to rotate.

6. The double-layer energy-saving and high-efficiency mold for producing EPS and EPP products according to claim 2, 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).

7. The double-layer energy-saving and high-efficiency mold for producing EPS and EPP products according to claim 1, characterized in that: The invention also comprises a leakage detection unit (40), the leakage detection unit (40) comprising a connecting pipe (41) fixedly connected to the extension pipe (17), a temperature sensor (42) being installed inside the connecting pipe (41), a sealing ring (43) being provided at the connection between the delivery pipe (15) and the extension pipe (17), and a filter (44) being fixedly connected inside the connecting pipe (41).

8. The double-layer energy-saving and high-efficiency mold for producing EPS and EPP products according to claim 1, characterized in that: Gears (13) are rotatably connected to both sides of the male mold (10), and the outer side of each gear (13) is meshingly connected to two racks (12) respectively fixed to the two female molds (11). Positioning rods (14) slidably connected to the male mold (10) are fixedly connected to the opposite sides of the two female molds (11), 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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