A heating system for PC membrane forming

Abstract

The application discloses a heating system for PC diaphragm forming, which comprises a PC diaphragm transposition assembly, a PC diaphragm heating assembly, a PC diaphragm compression forming assembly and a PC diaphragm feeding and conveying assembly arranged outside the PC diaphragm transposition assembly, a preheating and heating structure for the PC diaphragm is formed inside the PC diaphragm heating assembly, a compression structure for PC diaphragm forming is formed on the PC diaphragm compression forming assembly, the PC diaphragm feeding and conveying assembly forms a structure for feeding PC diaphragm semi-finished product to the PC diaphragm transposition assembly, and the PC diaphragm transposition assembly forms a fixed-point positioning transposition feeding structure between the PC diaphragm heating assembly, the PC diaphragm compression forming assembly and the PC diaphragm feeding and conveying assembly.

Description

Technical Field

[0001] This invention belongs to the field of PC film forming technology, and specifically relates to a heating system for PC film forming. Background Technology

[0002] The application development of PC films is moving towards high integration, high functionality, specialization, and serialization. Currently, various product types have been launched, including optical discs, automobiles, office equipment, cabinets, packaging, pharmaceuticals, lighting, and films.

[0003] The existing technology has the following problems: PC film forming mostly adopts hot pressing technology, that is, the PC film is first heated, and then the heated PC film is sent into a mold for molding. At present, the existing PC film forming production line and system have the following problems: on the one hand, the production line is too long, and the investment and maintenance costs are high; on the other hand, the necessary heating process is lacking when hot pressing the PC film. The existing hot pressing process mostly heats the PC film directly. This method is prone to uneven heating of the PC film during rapid cooling and heating, resulting in low yield and poor quality of the finished product in subsequent hot pressing. Summary of the Invention

[0004] To address the problems mentioned in the background section, this invention provides a heating system for PC film forming, which facilitates the hot pressing of PC films.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a heating system for PC film forming, comprising a PC film repositioning component, wherein a PC film heating component, a PC film pressing and forming component, and a PC film feeding and conveying component are arranged around the PC film repositioning component; the PC film heating component forms a preheating and heating structure for the PC film; the PC film pressing and forming component forms a pressing structure for PC film forming; the PC film feeding and conveying component forms a structure for feeding PC film semi-finished material to the PC film repositioning component; and the PC film repositioning component forms a fixed-point positioning and repositioning feeding structure between the PC film heating component, the PC film pressing and forming component, and the PC film feeding and conveying component.

[0006] The PC film heating assembly includes a PC film heating base. An arc-shaped PC film heating cover and a PC film preheating cover are fixedly mounted on the PC film heating base via a first support arm and a second support arm. PC film heating rods are provided at the top and bottom of the inner wall of the arc-shaped PC film heating cover, and an exhaust back pipe is provided on the back of the arc-shaped PC film heating cover. Air supply pipes are provided at the top and bottom of the PC film preheating cover, and a rear through groove is provided on the back of the PC film preheating cover.

[0007] Preferably, the PC film transposition assembly includes a PC film transposition frame and a U-shaped placement slot. The PC film transposition frame is rotatably equipped with a transposition wheel and a drive motor. The output shaft of the drive motor is equipped with a grooved cam. The grooved cam is equipped with a toggle arm and a toggle lever. The transposition wheel is equipped with an arc-shaped limiting groove and a toggle slide groove. The transposition wheel is fixedly equipped with multiple transverse support arms by a support vertical arm. The end of each transverse support arm is equipped with an end cross platform and a through slide hole. The rear end of the U-shaped placement slot is equipped with a T-shaped back platform and a guide slide rod. A tensioning spring is equipped on the guide slide rod.

[0008] The PC film pressing and forming assembly includes a PC film pressing and forming frame, on which a lower mold and a PC film pressing and forming cylinder are provided, and an upper mold is provided at the bottom of the PC film pressing and forming cylinder;

[0009] The PC film feeding and conveying assembly includes a PC film feeding and conveying frame, on which a feeding conveying roller and a servo motor are provided, and a feeding conveying belt is provided outside the feeding conveying roller.

[0010] Preferably, the PC film repositioning assembly is disposed in the middle of the PC film heating assembly, the PC film pressing and forming assembly, and the PC film feeding and conveying assembly, and the PC film heating assembly is disposed between the PC film feeding and conveying assembly and the PC film pressing and forming assembly.

[0011] Preferably, the arc-shaped PC film heating cover is formed with a high-temperature heating environment by the PC film heating rod, the exhaust back pipe is connected to the air inlet of the external exhaust device, the air supply end pipe is connected to the air outlet of the external exhaust device, the arc-shaped PC film heating cover forms a high-temperature heating environment for the PC film, and the PC film preheating cover forms a low-temperature preheating environment for the PC film.

[0012] Preferably, the guide slide rod slides through the through hole and the end cross platform, and the two ends of the clamping spring abut against the T-shaped back platform and the end cross platform. Through the clamping of the clamping spring, the U-shaped placement slot platform naturally rises on the end cross platform.

[0013] Preferably, the far end of the feeding conveyor belt passes through the PC film preheating cover through the rear through groove, and the far end of the feeding conveyor belt is directly opposite a U-shaped placement groove on the PC film transposition assembly. The height of the upper surface of the feeding conveyor belt is higher than the height of the bottom surface of the U-shaped placement groove.

[0014] Preferably, the PC film transposition assembly is provided with three sets of U-shaped placement slots. The three sets of U-shaped placement slots serve as a loading platform structure, a heating platform structure, and a pressing and forming platform structure for the PC film, respectively. The drive motor drives the grooved cam to rotate. The transposition wheel rotates on the top of the PC film transposition frame through a shaft and a bearing seat. The wheel of the grooved cam is limited to rotate within an arc-shaped limiting groove. The actuating arm at the end of the actuating crossarm actuates the wheel of the transposition wheel through an actuating groove.

[0015] Preferably, the PC film pressing and forming cylinder drives the upper mold to move up and down, and the upper mold and the lower mold form an upper and lower pressing extrusion mold closing and mold opening structure.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: In use, the PC film heating assembly, PC film pressing and forming assembly, and PC film feeding and conveying assembly are arranged around the PC film shifting assembly. The PC film shifting assembly forms a fixed-point positioning and shifting feeding structure between the PC film heating assembly, PC film pressing and forming assembly, and PC film feeding and conveying assembly. In actual use, the PC film heating rod creates a high-temperature heating environment inside the arc-shaped PC film heating cover. The exhaust back pipe is connected to the air inlet of the external exhaust device, and the air supply end pipe is connected to the air outlet of the external exhaust device. Through the PC film heating rod, a high-temperature heating environment for the PC film is formed inside the arc-shaped PC film heating cover. When the PC film passes through the arc-shaped PC film... During heating, the high-temperature environment heats the PC film. Simultaneously, an external exhaust system and exhaust pipe create a slight negative pressure environment inside the arc-shaped PC film heating hood. High-temperature air is then introduced into the PC film preheating hood, creating a low-temperature preheating environment for the PC film. During the heating process, the PC film undergoes both preheating and high-temperature heating. This method effectively utilizes the heat generated by the PC film heating rod while ensuring the quality and efficiency of the heating process. When the PC film is repositioned via the PC film repositioning assembly, the grooved cam wheel rotates within the arc-shaped limiting groove. The actuating arm at the end of the actuating arm moves the repositioning wheel via the actuating groove. The grooved cam and the repositioning wheel work together to achieve the desired effect. The three U-shaped placement slots can be interchanged. In actual use, the PC film placement assembly is equipped with three sets of U-shaped placement slots, which serve as the PC film feeding platform, heating platform, and pressing and forming platform, respectively. The three sets of U-shaped placement slots interchange with each other. One set of U-shaped placement slots first receives the PC film semi-finished material fed in by the feeding conveyor belt. Then, through the switching action of the PC film placement assembly, the semi-finished material is sent into the arc-shaped PC film heating cover and PC film preheating cover for preheating and heating. After heating, the semi-finished material is again switched by the PC film placement assembly and sent into the PC film pressing and forming assembly. At this time, the PC film pressing and forming cylinder... The upper and lower molds move up and down, forming a pressing and extruding structure between them. This structure allows for the extrusion molding of heated PC film semi-finished material. Meanwhile, a guide slide rod slides through a through-hole onto the end crossbeam. Pressed by a tension spring, the U-shaped placement slot naturally rises onto the end crossbeam. This structure enables the U-shaped placement slot to move up and down relative to the end crossbeam and automatically reset. The up-and-down movement coordinates with the extrusion and molding between the upper and lower molds, ensuring a good fit between the PC film semi-finished material. This invention features a simple structure and compact production equipment. The invention's centered, ring-shaped arrangement of the PC film transposition component minimizes the equipment's footprint.Meanwhile, this invention improves the heating system, enabling it to effectively heat the PC film while utilizing a portion of the heat for preheating, thus ensuring the quality and efficiency of heating the PC film. Attached Figure Description

[0017] Figure 1 This is a perspective view of the present invention;

[0018] Figure 2 This is an exploded view of the present invention;

[0019] Figure 3 This is a perspective view of the PC diaphragm heating assembly of the present invention;

[0020] Figure 4 This is a perspective view of the PC diaphragm transposition assembly of the present invention;

[0021] Figure 5 This is an exploded view of the PC diaphragm transposition assembly of the present invention;

[0022] Figure 6 This is a perspective view of the PC film pressing and molding assembly of the present invention;

[0023] Figure 7 This is a perspective view of the PC film feeding and conveying assembly of the present invention;

[0024] In the diagram: 100, PC diaphragm heating assembly; 101, PC diaphragm heating platform; 102, first support arm; 103, exhaust back duct; 104, arc-shaped PC diaphragm heating cover; 105, PC diaphragm heating rod; 106, PC diaphragm preheating cover; 107, air supply end duct; 108, rear end through slot; 109, second support arm; 200, PC diaphragm transposition assembly; 201, PC diaphragm transposition frame; 202, drive motor; 203, arc-shaped limiting slot; 204, actuating slide groove; 205, transverse support arm; 206, actuating arm rod; 207, guide slide rod; 20 8. Tightening spring; 209. U-shaped placement slot; 210. T-shaped back platform; 211. Through-slide hole; 212. End cross platform; 213. Actuating cross arm; 214. Grooved cam; 215. Supporting vertical arm; 216. Shifting wheel; 300. PC film pressing and forming assembly; 301. PC film pressing and forming frame; 302. Lower mold; 303. Upper mold; 304. PC film pressing and forming cylinder; 400. PC film feeding and conveying assembly; 401. PC film feeding and conveying frame; 402. Feeding conveyor roller; 403. Servo motor; 404. Feeding conveyor belt. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] Please see Figure 1-7 The present invention provides the following technical solution: a heating system for PC film forming, comprising a PC film transposition assembly 200, a PC film heating assembly 100, a PC film pressing and forming assembly 300, and a PC film feeding and conveying assembly 400 disposed around the PC film transposition assembly 200. The PC film heating assembly 100 has a preheating and heating structure for the PC film inside, the PC film pressing and forming assembly 300 has a pressing structure for PC film forming, and the PC film feeding and conveying assembly 400 forms a feeding and conveying assembly to the PC film transposition assembly 200. The structure for feeding PC film semi-finished materials includes a PC film transposition component 200 that forms a fixed-point positioning transposition feeding structure between the PC film heating component 100, the PC film pressing and forming component 300, and the PC film feeding and conveying component 400. The PC film transposition component 200 is located in the middle of the PC film heating component 100, the PC film pressing and forming component 300, and the PC film feeding and conveying component 400. The PC film heating component 100 is located between the PC film feeding and conveying component 400 and the PC film pressing and forming component 300.

[0027] The PC diaphragm heating assembly 100 includes a PC diaphragm heating base 101. An arc-shaped PC diaphragm heating cover 104 and a PC diaphragm preheating cover 106 are fixedly mounted on the PC diaphragm heating base 101 via a first support arm 102 and a second support arm 109. PC diaphragm heating rods 105 are provided at the top and bottom of the inner wall of the arc-shaped PC diaphragm heating cover 104, and an exhaust back pipe 103 is provided on the back of the arc-shaped PC diaphragm heating cover 104. Feeders are provided at the top and bottom of the PC diaphragm preheating cover 106. The air end pipe 107 and the back of the PC film preheating cover 106 are provided with a rear through groove 108. The PC film heating rod 105 makes the arc-shaped PC film heating cover 104 form a high-temperature heating environment. The exhaust back pipe 103 is connected to the air inlet of the external exhaust device, and the air supply end pipe 107 is connected to the air outlet of the external exhaust device. The arc-shaped PC film heating cover 104 forms a high-temperature heating environment for the PC film, and the PC film preheating cover 106 forms a low-temperature preheating environment for the PC film.

[0028] The PC diaphragm transposition assembly 200 includes a PC diaphragm transposition frame 201 and a U-shaped placement slot 209. A transposition wheel 216 is rotatably mounted on the PC diaphragm transposition frame 201, and a drive motor 202 is mounted on the PC diaphragm transposition frame 201. A grooved cam 214 is mounted on the output shaft of the drive motor 202. A toggle arm 213 and a toggle lever 206 are mounted on the grooved cam 214. The transposition wheel 216 has an arc-shaped limiting groove 203 and a toggle sliding groove 204. Multiple transverse support arms 205 are fixedly mounted on the transposition wheel 216 via a supporting vertical arm 215. An end crossbeam 212 is mounted at the end of each transverse support arm 205, and a through-hole 211 is mounted on the end crossbeam 212. A T-shaped back platform 210 is mounted at the rear end of the U-shaped placement slot 209, and a guide slide rod 207 is mounted on the T-shaped back platform 210. A top... A tension spring 208 and a guide slide rod 207 slide through a through-hole 211 and an end cross platform 212. The two ends of the tension spring 208 abut against the T-shaped back platform 210 and the end cross platform 212. Due to the tension of the tension spring 208, the U-shaped placement slot platform 209 naturally pushes up on the end cross platform 212. The PC film transposition assembly 200 is provided with three sets of U-shaped placement slot platforms 209. The three sets of U-shaped placement slot platforms 209 serve as the PC film feeding platform structure, heating platform structure, and pressing and forming platform structure, respectively. The drive motor 202 drives the grooved cam 214 to rotate. The transposition wheel 216 rotates on the top of the PC film transposition frame 201 through a shaft and a bearing seat. The wheel of the grooved cam 214 is limited to rotate in the arc-shaped limiting groove 203. The actuating arm 206 at the end of the actuating cross arm 213 actuates the wheel of the transposition wheel 216 through the actuating slide groove 204.

[0029] The PC diaphragm pressing and forming assembly 300 includes a PC diaphragm pressing and forming frame 301. The PC diaphragm pressing and forming frame 301 is provided with a lower mold 302 and a PC diaphragm pressing and forming cylinder 304. The bottom of the PC diaphragm pressing and forming cylinder 304 is provided with an upper mold 303. The PC diaphragm pressing and forming cylinder 304 drives the upper mold 303 to move up and down. The upper mold 303 and the lower mold 302 form an upper and lower pressing extrusion mold closing and mold opening structure.

[0030] The PC film feeding and conveying assembly 400 includes a PC film feeding and conveying frame 401, on which a feeding conveying roller 402 and a servo motor 403 are mounted. A feeding conveyor belt 404 is mounted outside the feeding conveying roller 402. The far end of the feeding conveyor belt 404 passes through the PC film preheating cover 106 through a rear through groove 108, and the far end of the feeding conveyor belt 404 is directly opposite a U-shaped placement groove 209 on the PC film transposition assembly 200. The height of the upper surface of the feeding conveyor belt 404 is higher than the height of the bottom surface of the placement groove of the U-shaped placement groove 209.

[0031] Working principle and usage of the invention: In use, the PC film heating assembly 100, PC film pressing and forming assembly 300, and PC film feeding and conveying assembly 400 are arranged around the PC film shifting assembly 200. The PC film shifting assembly 200 forms a fixed-point positioning and shifting feeding structure between the PC film heating assembly 100, PC film pressing and forming assembly 300, and PC film feeding and conveying assembly 400. In actual use, the PC film heating rod 105 creates a high-temperature heating environment inside the arc-shaped PC film heating cover 104. The exhaust back pipe 103 is connected to the air inlet of the external exhaust device, and the air supply end pipe 107 is connected to the air outlet of the external exhaust device. Through the PC film heating rod 105, the arc-shaped PC film heating cover 104... The arc-shaped PC film heating cover 104 creates a high-temperature heating environment for the PC film. When the PC film passes through the arc-shaped PC film heating cover 104, the high-temperature environment heats the PC film. Simultaneously, through the external exhaust device and exhaust back pipe 103, a slight negative pressure environment is generated inside the arc-shaped PC film heating cover 104. At this time, high-temperature air is sent into the PC film preheating cover 106, creating a low-temperature preheating environment for the PC film. During the heating of the PC film, it undergoes both preheating and high-temperature heating. This method effectively utilizes the heat generated by the PC film heating rod 105 while ensuring the quality and effect of the PC film heating. (The last sentence appears to be incomplete and possibly refers to a separate process: "through the PC film transposition assembly...") When part 200 is repositioned, the wheel of the grooved cam 214 is limited to rotate within the arc-shaped limiting groove 203. The actuating arm 206 at the end of the actuating arm 213 actuates the wheel of the repositioning wheel 216 through the actuating slide 204. Through the cooperation of the grooved cam 214 and the repositioning wheel 216, the mutual repositioning between the three U-shaped placement slots 209 can be realized. In actual use, the PC film repositioning assembly 200 is equipped with three sets of U-shaped placement slots 209. The three sets of U-shaped placement slots 209 serve as the PC film feeding platform structure, heating platform structure, and pressing and forming platform structure, respectively. The three sets of U-shaped placement slots 209 are repositioned. One set of U-shaped placement slots 209 first receives the PC film semi-finished material fed in by the feeding conveyor belt 404, and then passes through P During the shifting action of the PC film shifting assembly 200, the PC film semi-finished material is fed into the arc-shaped PC film heating cover 104 and the PC film preheating cover 106 for preheating and heating. After heating, the PC film semi-finished material is again shifted by the PC film shifting assembly 200 and fed into the PC film pressing and forming assembly 300. At this time, the PC film pressing and forming cylinder 304 drives the upper mold 303 to move up and down. The upper mold 303 and the lower mold 302 form an upper and lower pressing extrusion mold closing and opening structure. Through this structure, the heated PC film semi-finished material is extruded and formed. At this time, the guide slide rod 207 slides through the through slide hole 211 and the end cross platform 212, and is tightened by the clamping spring 208.The U-shaped placement slot 209 naturally rises onto the end crossbeam 212. This structure allows the U-shaped placement slot 209 to move up and down relative to the end crossbeam 212 and automatically reset. The up-and-down movement coordinates with the extrusion and mold closing between the upper mold 303 and the lower mold 302, ensuring a good fit between the PC film semi-finished material. This invention features a simple structure and compact production equipment. The PC film shifting component 200 is arranged in a surrounding pattern, minimizing the equipment's footprint. Furthermore, the improved heating system allows for effective heating of the PC film, while also utilizing some of the heat for preheating, ensuring both heating quality and efficiency.

[0032] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A heating system for PC film forming, comprising a PC film transposition assembly (200), characterized in that: The PC film transposition assembly (200) is surrounded by a PC film heating assembly (100), a PC film pressing and forming assembly (300), and a PC film feeding and conveying assembly (400). The PC film heating assembly (100) has a preheating and heating structure for the PC film inside. The PC film pressing and forming assembly (300) has a pressing structure for forming the PC film. The PC film feeding and conveying assembly (400) has a structure for feeding PC film semi-finished materials to the PC film transposition assembly (200). The PC film transposition assembly (200) forms a fixed-point positioning transposition and feeding structure between the PC film heating assembly (100), the PC film pressing and forming assembly (300), and the PC film feeding and conveying assembly (400). The PC film heating assembly (100) includes a PC film heating base (101). An arc-shaped PC film heating cover (104) and a PC film preheating cover (106) are fixedly installed on the PC film heating base (101) via a first support arm (102) and a second support arm (109). PC film heating rods (105) are provided at the top and bottom of the inner wall of the arc-shaped PC film heating cover (104), and an exhaust back pipe (103) is provided on the back of the arc-shaped PC film heating cover (104). An air supply end pipe (107) is provided at the top and bottom of the PC film preheating cover (106), and a rear end through groove (108) is provided on the back of the PC film preheating cover (106).

2. The heating system for PC film forming according to claim 1, characterized in that: The PC film transposition assembly (200) includes a PC film transposition frame (201) and a U-shaped placement slot (209). A transposition wheel (216) is rotatably mounted on the PC film transposition frame (201), and a drive motor (202) is mounted on the PC film transposition frame (201). A grooved cam (214) is mounted on the output shaft of the drive motor (202). A toggle arm (213) and a toggle lever (206) are mounted on the grooved cam (214). An arc-shaped limiting groove (206) is mounted on the transposition wheel (216). 03) and the shifting groove (204), and the shifting wheel (216) is fixedly provided with multiple horizontal support arms (205) through the support vertical arm (215). The end of the horizontal support arm (205) is provided with an end cross platform (212). The end cross platform (212) is provided with a through slide hole (211). The rear end of the U-shaped placement groove platform (209) is provided with a T-shaped back platform (210). The T-shaped back platform (210) is provided with a guide slide rod (207). The guide slide rod (207) is provided with a top spring (208). The PC film pressing and forming assembly (300) includes a PC film pressing and forming frame (301), on which a lower mold (302) and a PC film pressing and forming cylinder (304) are provided, and an upper mold (303) is provided at the bottom of the PC film pressing and forming cylinder (304). The PC film feeding and conveying assembly (400) includes a PC film feeding and conveying frame (401), on which a feeding conveying roller (402) and a servo motor (403) are provided, and a feeding conveying belt (404) is provided outside the feeding conveying roller (402).

3. The heating system for PC film forming according to claim 1, characterized in that: The PC film repositioning assembly (200) is located in the middle of the PC film heating assembly (100), the PC film pressing and forming assembly (300) and the PC film feeding and conveying assembly (400), and the PC film heating assembly (100) is located between the PC film feeding and conveying assembly (400) and the PC film pressing and forming assembly (300).

4. The heating system for PC film forming according to claim 1, characterized in that: The PC film heating rod (105) creates a high-temperature heating environment inside the arc-shaped PC film heating cover (104). The exhaust back pipe (103) is connected to the air inlet of the external exhaust device, and the air supply end pipe (107) is connected to the air outlet of the external exhaust device. The arc-shaped PC film heating cover (104) creates a high-temperature heating environment for the PC film, and the PC film preheating cover (106) creates a low-temperature preheating environment for the PC film.

5. A heating system for PC film forming according to claim 2, characterized in that: The guide slide rod (207) slides through the through slide hole (211) and the end cross platform (212). The two ends of the top spring (208) abut against the T-shaped back platform (210) and the end cross platform (212). Through the top spring (208), the U-shaped placement slot platform (209) naturally rises on the end cross platform (212).

6. The heating system for PC film forming according to claim 2, characterized in that: The far end of the feeding conveyor belt (404) passes through the PC film preheating cover (106) through the rear through groove (108), and the far end of the feeding conveyor belt (404) is directly opposite a U-shaped placement groove (209) on the PC film transposition assembly (200). The height of the upper surface of the feeding conveyor belt (404) is higher than the height of the bottom surface of the U-shaped placement groove (209).

7. A heating system for PC film forming according to claim 2, characterized in that: The PC film transposition assembly (200) is provided with three sets of U-shaped placement slots (209). The three sets of U-shaped placement slots (209) serve as the loading platform structure, heating platform structure, and pressing and forming platform structure of the PC film, respectively. The drive motor (202) drives the grooved cam (214) to rotate. The transposition wheel (216) rotates on the top of the PC film transposition frame (201) through the shaft and bearing seat. The wheel body of the grooved cam (214) is limited to rotate in the arc-shaped limiting groove (203). The actuating arm (206) at the end of the actuating cross arm (213) actuates the wheel body of the transposition wheel (216) through the actuating slide (204).

8. The heating system for PC film forming according to claim 2, characterized in that: The PC film pressing and forming cylinder (304) drives the upper mold (303) to move up and down, and the upper mold (303) and the lower mold (302) form an upper and lower pressing extrusion mold closing and mold opening structure.

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