An automobile covering piece trimming, punching and separating die

Abstract

This invention discloses a trimming, punching, and separating mold for automotive body panels, including a lower mold and an upper mold at the top of the lower mold. The upper mold has a first annular groove at its top, and a first annular block is installed inside the first annular groove. This invention, through the cooperation of an electric telescopic rod, a rectangular block, a mounting plate, a micro vibrator, and a metal file, can clean the burrs on the surface of the trimmed automotive body panel, thus ensuring the quality of the processed automotive body panel. With the cooperation of a hydraulic rod and the upper mold, the first annular block can drive the annular cutter upwards. With the cooperation of the hydraulic rod and the second annular block, the upper mold can move vertically and stably upwards, simultaneously separating the bottom of the upper mold from the top of the lower mold. With the cooperation of the micro vibrator, the metal file, and the mounting plate, vibration can remove the burrs from the surface of the trimmed automotive body panel.

Description

Technical Field

[0001] This invention relates to the field of automotive body panel technology, specifically to an automotive body panel trimming, punching, and separation mold. Background Technology

[0002] Automotive body panels refer to spatially shaped surface or internal parts made of thin metal sheets that cover the engine, chassis, and form the cab and body. They can be divided into three categories according to function and location: external body panels, internal body panels, and frame body panels. These differ from general stamped parts in terms of process design, mold processing, equipment selection, and quality control (dimensional tolerances, shape accuracy, part rigidity, surface quality). The basic stamping processes for automotive body panels include: blanking, pre-bending, drawing, trimming, punching, flanging, and shaping.

[0003] In existing technologies, such as the Chinese patent CN102814399A, there is a trimming, punching, and separation mold for automotive body panels, which includes an upper mold and a lower mold. The upper mold includes an upper mold base, a trimming concave mold insert, a punching punch, a middle cutting blade, and an upper pressure body. The lower mold includes a lower mold base, a trimming, punching, and separation punch and concave mold insert, a waste cutting blade, a lower ejector body, an ejector body guide block, an ejector body limiting screw, a spring, a push rod, and a waste box. Another aspect of this invention is a method for trimming, punching, and separating automotive body panels. While trimming and punching, the left and right parts are separated. After trimming, punching, and separation, the lower ejector body pushes out the middle cut waste, and the separated waste at both ends naturally separates and slides out, facilitating the smooth removal of the separated waste. Although the mold in the patent can trim, punch, and separate automotive body panels, existing automotive body panels may still have burrs on their surface after trimming. The mold in the aforementioned patent does not have the function of burr removal for automotive body panels, which means that the processed automotive body panels still need to be burr removed using other tools.

[0004] Therefore, we propose a trimming, punching, and separation mold for automotive body panels to solve the problems mentioned above. Summary of the Invention

[0005] The purpose of this invention is to provide a trimming, punching, and separation mold for automotive body panels, which can effectively solve the problem of removing burrs that may be generated after trimming automotive body panels.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a trimming, punching, and separating mold for automotive body panels, comprising a lower mold, an upper mold at the top of the lower mold, a first annular groove at the top of the upper mold, a first annular block installed inside the first annular groove, an annular cutter fixed at the bottom of the first annular block, cylindrical grooves at the four corners of the bottom of the upper mold, a hydraulic rod installed inside each cylindrical groove, a second annular block fixedly fitted onto the outer surface of the lower mold, the bottom of the upper mold movably fitted into the second annular block, a second annular groove at the top of the lower mold, and two electric telescopic rods installed on the four sides of the inner wall of the second annular groove. Each of the electric telescopic rods has a rectangular block fixed to its telescopic end. The eight rectangular blocks are divided into four groups. A mounting plate is fixed between the tops of each group of rectangular blocks. A metal file plate is installed in the groove of each mounting plate. The eight electric telescopic rods are divided into four groups. A fixing frame is fixed between the outer surfaces of each group of electric telescopic rods. An L-shaped frame is fixed to the bottom of each fixing frame. Each L-shaped frame is bolted to the inner wall of the second annular groove. A micro vibrator is installed at the bottom of each mounting plate. Four punch heads are fixed to the bottom of the upper mold. Four discharge slots are opened at the bottom of the inner wall of the lower mold. A guide hole is opened at the bottom of the inner wall of each discharge slot.

[0007] Preferably, the top of the upper mold is provided with a rectangular groove, and multiple miniature negative pressure pumps are installed at the bottom of the inner wall of the rectangular groove.

[0008] Preferably, each of the miniature negative pressure pumps is equipped with a connecting pipe at its air inlet end, and a filter screen is installed on the top of the upper mold.

[0009] Preferably, the bottom of the upper mold has multiple feed slots evenly distributed, and a third annular groove is formed between the top of the inner walls of the multiple feed slots.

[0010] Preferably, the air inlet end of each of the connecting pipes is fixedly inserted through the bottom of the inner wall of the rectangular groove, and the air inlet end of each connecting pipe extends into the interior of the third annular groove.

[0011] Preferably, L-shaped holes are provided on both sides of the lower mold, and a first sealing gasket is movably fitted inside each of the two L-shaped holes.

[0012] Preferably, push blocks are bonded to the top of both first sealing gaskets, and the two push blocks are respectively movably fitted inside the two L-shaped holes.

[0013] Preferably, a support frame is fixed to the bottom of the inner wall of each of the two L-shaped holes, and a set of L-shaped limiting blocks is fixed to both sides of the lower mold, with two L-shaped limiting blocks in each set.

[0014] Preferably, a second sealing gasket is movably fitted inside each of the two L-shaped holes, and a T-shaped block is bonded to the opposite side of each of the two second sealing gaskets, with the opposite side of each of the two T-shaped blocks movably fitted inside the two L-shaped holes.

[0015] Preferably, multiple springs are fixedly installed on opposite sides of the two T-blocks, and one end of each spring is fixedly installed on the outer surface of the lower mold. Heat dissipation holes are provided on both sides of the inner wall of the second annular groove, and dustproof nets are installed inside the two heat dissipation holes.

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

[0017] 1. This invention, through the cooperation of an electric telescopic rod, a rectangular block, a mounting plate, a micro vibrator, and a metal file, can clean the burrs on the surface of a trimmed automotive body panel, thus ensuring the quality of the processed automotive body panel. The cooperation of a fixed frame and an L-shaped frame improves the stability of the electric telescopic rod as it moves through the rectangular block and the electric mounting plate. The cooperation of a hydraulic rod and an upper mold allows the first annular block to drive the annular cutter upwards. The cooperation of the hydraulic rod and the second annular block allows the upper mold to move vertically and stably upwards, while simultaneously separating the bottom of the upper mold from the top of the lower mold. The cooperation of the upper mold, the first annular block, and the annular cutter enables trimming of the automotive body panel. The second annular groove collects the waste material from the trimming process. The cooperation of the micro vibrator, the metal file, and the mounting plate removes burrs from the surface of the trimmed automotive body panel through vibration.

[0018] 2. This invention, through the cooperation of the upper mold and the stamping head, can perform punching operations on automotive body panels. At the same time, with the cooperation of the discharge chute and the guide hole, the waste material punched from the automotive body panel can be guided into the interior of the second annular chute for collection. With the cooperation of the micro negative pressure pump, connecting pipe, third annular chute and feed chute, the dust generated during the deburring of the automotive body panel by the metal file can be absorbed into the interior of the rectangular chute for collection. With the action of the filter screen, the dust can be filtered and retained inside the rectangular chute.

[0019] 3. This invention utilizes the combination of an L-shaped hole, a first sealing gasket, a push block, a second sealing gasket, and a T-shaped block to push the processed automotive body panel out from the lower mold using pneumatic pressure. This facilitates the removal of the automotive body panel. With the cooperation of a spring and an L-shaped limiting block, the T-shaped block can automatically reset. In other words, the push block automatically resets using pneumatic pressure. Under the action of the support frame, the first sealing gasket can be prevented from moving down to the inner turning point of the L-shaped hole. Attached Figure Description

[0020] Figure 1 This is a perspective view of a trimming, punching, and separating mold for an automotive body panel according to the present invention.

[0021] Figure 2 This is a partial perspective view of a trimming, punching, and separating mold for an automotive body panel according to the present invention.

[0022] Figure 3 This is a perspective view of another angle of a mold for trimming, punching, and separating automotive body panels according to the present invention.

[0023] Figure 4 This is a partial sectional perspective view of a trimming, punching, and separating mold for an automotive body panel according to the present invention.

[0024] Figure 5 This invention relates to a mold for trimming, punching, and separating automotive body panels. Figure 4 Enlarged 3D view at point A in the middle;

[0025] Figure 6 This is a three-dimensional structural diagram of an electric telescopic rod, rectangular block, mounting plate, metal file plate, fixing frame, micro vibrator and L-shaped frame for a trimming, punching and separating mold for automotive body panels according to the present invention.

[0026] Figure 7 This is a top-view perspective view of a trimming, punching, and separating mold for an automotive body panel according to the present invention.

[0027] Figure 8 This is a perspective cross-sectional view of the upper mold of a trimming, punching, and separating mold for automotive body panels according to the present invention.

[0028] In the diagram: 1. Lower mold; 2. Upper mold; 3. First annular groove; 4. First annular block; 5. Annular cutter; 6. Cylindrical groove; 7. Hydraulic rod; 8. Second annular block; 9. Electric telescopic rod; 10. Rectangular block; 11. Mounting plate; 12. Metal file plate; 13. Fixing frame; 14. L-shaped frame; 15. Second annular groove; 16. Punching head; 17. Discharge chute; 18. Guide hole; 19. Miniature vibrator; 20. Rectangular groove; 21. Miniature negative pressure pump; 22. Connecting pipe; 23. Filter screen; 24. Feed chute; 25. Third annular groove; 26. L-shaped hole; 27. First sealing gasket; 28. Push block; 29. ​​Support frame; 30. L-shaped limit block; 31. Second sealing gasket; 32. T-shaped block; 33. Spring; 34. Heat dissipation hole; 35. Dustproof net. Detailed Implementation

[0029] 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.

[0030] Please see Figure 1-8 As shown, the present invention provides a technical solution: a trimming, punching, and separating mold for automotive body panels, comprising a lower mold 1, an upper mold 2 disposed on the top of the lower mold 1, a first annular groove 3 formed on the top of the upper mold 2, a first annular block 4 installed inside the first annular groove 3, an annular cutter 5 fixed at the bottom of the first annular block 4, cylindrical grooves 6 formed at the four corners of the bottom of the upper mold 2, a hydraulic rod 7 installed inside each cylindrical groove 6, a second annular block 8 fixedly fitted onto the outer surface of the lower mold 1, the bottom of the upper mold 2 movably fitted into the interior of the second annular block 8, a second annular groove 15 formed on the top of the lower mold 1, two electric telescopic rods 9 installed on the four sides of the inner wall of the second annular groove 15, each electric telescopic rod 9... Each telescopic end is fixed with a rectangular block 10. The eight rectangular blocks 10 are divided into four groups. A mounting plate 11 is fixed between the tops of each group of rectangular blocks 10. A metal file plate 12 is installed in the groove of each mounting plate 11. The eight electric telescopic rods 9 are divided into four groups. A fixing frame 13 is fixed between the outer surfaces of each group of electric telescopic rods 9. An L-shaped frame 14 is fixed at the bottom of each fixing frame 13. Each L-shaped frame 14 is bolted to the inner wall of the second annular groove 15. A micro vibrator 19 is installed at the bottom of each mounting plate 11. Four punch heads 16 are fixed at the bottom of the upper mold 2. Four discharge grooves 17 are opened at the bottom of the inner wall of the lower mold 1. A guide hole 18 is opened at the bottom of the inner wall of each discharge groove 17.

[0031] according to Figure 1 , Figure 2 , Figure 4 and Figure 7 As shown, a rectangular groove 20 is provided on the top of the upper mold 2. Multiple micro negative pressure pumps 21 are installed on the bottom of the inner wall of the rectangular groove 20. Under the action of the rectangular groove 20, the metal powder generated by the metal scraper 12 during operation can be absorbed and moved into the interior of the rectangular groove 20 for collection when the micro negative pressure pumps 21, connecting pipes 22, third annular groove 25 and feed groove 24 work together.

[0032] according to Figure 1 , Figure 2 , Figure 4 and Figure 7As shown, each miniature negative pressure pump 21 has a connecting pipe 22 installed at its air inlet end, and a filter screen 23 is installed on the top of the upper mold 2. This allows the gas containing metal dust that enters the rectangular groove 20 to be filtered under the action of the filter screen 23. In other words, the metal dust can be filtered and left inside the rectangular groove 20, and the gas can be discharged into the environment through the through holes of the filter screen 23.

[0033] according to Figure 1 , Figure 2 , Figure 4 , Figure 5 and Figure 7 As shown, multiple feed slots 24 are evenly distributed at the bottom of the upper mold 2, and a third annular groove 25 is provided between the top of the inner wall of the multiple feed slots 24, so that with the cooperation of the micro negative pressure pump 21, the connecting pipe 22, the third annular groove 25 and the upper mold 2, all feed slots 24 inlets can obtain strong suction.

[0034] according to Figure 4 , Figure 5 and Figure 7 As shown, the air inlet end of each connecting pipe 22 is fixedly inserted through the bottom of the inner wall of the rectangular groove 20, and the air inlet end of each connecting pipe 22 extends into the interior of the third annular groove 25. This facilitates the flow of metal dust entering the interior of the third annular groove 25 to the interior of the micro negative pressure pump 21 under the action of the connecting pipe 22, and finally to the interior of the rectangular groove 20 for collection.

[0035] according to Figure 1 , Figure 3 , Figure 4 , Figure 7 and Figure 8 As shown, L-shaped holes 26 are provided on both sides of the lower mold 1. The first sealing gasket 27 is movably fitted inside the two L-shaped holes 26, so that an air pressure space can be formed with the cooperation of the L-shaped holes 26, the first sealing gasket 27 and the second sealing gasket 31.

[0036] according to Figure 4 As shown, push blocks 28 are bonded to the top of the two first sealing gaskets 27, and the two push blocks 28 are respectively movably fitted inside the two L-shaped holes 26, so that the push blocks 28 can be pushed out from inside the L-shaped holes 26 with the cooperation of the T-shaped block 32, the first sealing gasket 27, the second sealing gasket 31 and the L-shaped holes 26.

[0037] according to Figure 1 , Figure 3 , Figure 4 , Figure 7 and Figure 8As shown, support frames 29 are fixed to the bottom of the inner walls of the two L-shaped holes 26. A set of L-shaped limiting blocks 30 are fixed to both sides of the lower mold 1, and there are two L-shaped limiting blocks 30 in each set. This is to prevent the spring 33 from driving the T-shaped block 32 to over-reset under the action of the L-shaped limiting blocks 30. At the same time, under the action of the support frames 29, the first sealing gasket 27 can be prevented from moving to the inner corner of the L-shaped hole 26.

[0038] according to Figure 1 , Figure 3 , Figure 4 and Figure 7 As shown, a second sealing gasket 31 is movably fitted inside each of the two L-shaped holes 26. A T-shaped block 32 is bonded to the opposite side of each of the two second sealing gaskets 31, and the opposite side of each of the two T-shaped blocks 32 is movably fitted inside the two L-shaped holes 26. This allows the first sealing gasket 27 to be moved by air pressure through the cooperation of the T-shaped block 32, the L-shaped holes 26, and the second sealing gasket 31.

[0039] according to Figure 1 , Figure 3 , Figure 4 , Figure 5 , Figure 7 and Figure 8 As shown, multiple springs 33 are fixedly installed on opposite sides of the two T-blocks 32, and one end of each spring 33 is fixedly installed on the outer surface of the lower mold 1. Heat dissipation holes 34 are provided on both sides of the inner wall of the second annular groove 15. Dustproof nets 35 are installed inside the two heat dissipation holes 34. Under the action of the heat dissipation holes 34, the heat generated by the electric telescopic rod 9 and the micro vibrator 19 during operation can be discharged. At the same time, it is convenient for gas to enter the interior of the second annular groove 15. With the cooperation of the springs 33 and the lower mold 1, the T-blocks 32 can be quickly and automatically reset.

[0040] The overall mechanism achieves the following effect: When processing automotive body panels, the automotive body panel is first placed in the inner groove of the lower mold 1. Then, the upper mold 2 is aligned with the lower mold 1. The moving upper mold 2 drives the micro negative pressure pump 21, connecting pipe 22, first annular block 4, hydraulic rod 7, punch head 16, and annular cutter 5 to move. When the bottom of the upper mold 2 contacts the top of the lower mold 1, the automotive body panel is trimmed directly under the action of the annular cutter 5. The scrap material trimmed from the automotive body panel falls directly into the second annular groove 15. Simultaneously, the downward-moving punch head 16 punches the automotive body panel. The scrap material punched from the automotive body panel is directly punched by the punch head 16. 6. The waste material is sent into the discharge trough 17. Then, the waste material entering the discharge trough 17 will slide into the guide hole 18 and finally be guided into the second annular groove 15 for collection. When burrs appear on the edge of the car body panel after trimming, four hydraulic rods 7 are activated simultaneously. The telescopic end of each hydraulic rod 7 moves out from the inside of each cylindrical groove 6. Under the action of the four hydraulic rods 7, the upper mold 2 begins to move vertically upward slowly with the cooperation of the second annular block 8. At this time, the upward moving upper mold 2 will drive the micro negative pressure pump 21, connecting pipe 22, first annular block 4, hydraulic rods 7, punch head 16 and annular cutter 5 to move. When the bottom of the upper mold 2 and the top of the second annular block 8 are on the same horizontal line, at this time... The movement of hydraulic rod 7 is paused, at which point the cutting edge of the ring cutter 5 leaves the cutting position of the automotive body panel. Then, four sets of electric telescopic rods 9 are simultaneously activated. Each activated electric telescopic rod 9, in cooperation with its corresponding fixed frame 13 and L-shaped frame 14, drives the rectangular block 10 to move stably. Each moving rectangular block 10 drives its corresponding mounting plate 11 to move, and each moving mounting plate 11 drives its corresponding metal file plate 12 to move. Simultaneously, each moving mounting plate 11 also drives its corresponding micro vibrator 19 to move. When the four metal file plates 12 are in contact with the four sides of the automotive body panel, all electric telescopic rods 9 are paused, and then all micro vibrators are activated. When the actuator 19 is activated, the micro vibrator 19, in conjunction with the mounting plate 11, drives the metal scraper 12 to vibrate. The vibrating metal scraper 12 directly removes burrs from the edges of the automotive body panels. During this process, the metal scraper 12 may generate significant metal dust. To collect this dust, four micro negative pressure pumps 21 are simultaneously activated. Each micro negative pressure pump 21 generates a strong suction at its air inlet, and the corresponding connecting pipe 22 also receives strong suction. These four connecting pipes 22, in conjunction with the third annular groove 25, ensure that the inlet of each feeding trough 24 receives suction.At this time, the metal powder generated by the metal filing plate 12 during operation will be directly sucked into the third annular groove 25 by the feed trough 24, then enters the connecting pipe 22 from the third annular groove 25, then enters the micro negative pressure pump 21 from the connecting pipe 22, and finally enters the rectangular groove 20 from the micro negative pressure pump 21. When the metal dust enters the rectangular groove 20, it is directly filtered and retained inside the rectangular groove 20 by the filter screen 23, while the gas passes directly through the mesh of the filter screen 23 and is discharged into the environment. When the edge burrs of the automotive body panel are removed, the electric telescopic rod 9 is activated, and with the cooperation of the rectangular block 10 and the mounting plate 11, the micro vibrator 19 and the metal filing plate are driven. 12 is reset. When the metal filing plate 12 has completed its reset, all electric telescopic rods 9 are directly shut off. When the metal dust generated during the operation of the metal filing plate 12 is almost completely absorbed, all micro negative pressure pumps 21 are shut off. Then, the upper mold 2 is removed from the lower mold 1. After that, all hydraulic rods 7 are directly activated so that the telescopic ends of all hydraulic rods 7 return to the corresponding cylindrical grooves 6. When it is necessary to remove the processed automotive body panel placed inside the lower mold 1, the two T-blocks 32 are moved towards each other. Each moving T-block 32 will drive the corresponding second sealing gasket 31 to move inside the corresponding L-shaped hole 26. At this time, the pneumatic principle is applied. When the second sealing gasket 31 moves, it will cause the corresponding first sealing gasket 27 to move. The moving first sealing gasket 27 will cause the corresponding push block 28 to move upward. As the push block 28 moves continuously, the car body panel inside the lower mold 1 will slowly rise from the lower mold 1. At the same time, the moving T-block 32 will also compress each spring 33 with the cooperation of the lower mold 1. When the T-block 32 moves to the point where it can no longer move, the bottom of the push block 28 is still inside the corresponding L-shaped hole 26. At this time, the car body panel that has been moved out of the lower mold 1 can be directly removed. When the car body panel is removed, the force applied to the T-block 32 is released. 1. Under the action of the L-shaped limit block 30 and the spring 33, the T-shaped block 32 will automatically reset. At this time, the resetting T-shaped block 32, with the cooperation of the first sealing gasket 27, the second sealing gasket 31, and the L-shaped hole 26, will directly drive the push block 28 back into the L-shaped hole 26. When it is necessary to clean the metal dust inside the rectangular groove 20, simply tilt the upper mold 2 to the side, then remove the filter screen 23 from the upper mold 2. Then, the operator can use a brush to clean the metal dust inside the rectangular groove 20. When the electric telescopic rod 9 and the micro vibrator 19 are working, the heat generated by the electric telescopic rod 9 and the micro vibrator 19 can be dissipated through the heat dissipation holes 34.

[0041] Among them, the hydraulic rod 7, the electric telescopic rod 9, the miniature vibrator 19 and the miniature negative pressure pump 21 are all existing technologies and will not be explained in detail here.

[0042] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A trimming, piercing, separating die for automotive coverings, comprising a lower die (1), characterized in that: The lower mold (1) is provided with an upper mold (2) at its top. The bottom of the upper mold (2) is provided with a first annular groove (3). A first annular block (4) is installed inside the first annular groove (3). An annular blade (5) is fixed at the bottom of the first annular block (4). Cylindrical grooves (6) are provided at the four corners of the bottom of the upper mold (2). A hydraulic rod (7) is installed inside each of the cylindrical grooves (6). A second annular block (8) is fixedly fitted onto the outer surface of the lower mold (1). The bottom of the upper mold (2) is movably fitted into the interior of the second annular block (8). A second annular groove (15) is provided at the top of the lower mold (1). Two electric telescopic rods (9) are installed on the four sides of the inner wall of the second annular groove (15). A rectangular block (10) is fixed at the telescopic end of each electric telescopic rod (9). The rectangular blocks (10) are divided into four groups. Each group of rectangular blocks (10) has a mounting plate (11) fixed between its tops. Each mounting plate (11) has a metal file plate (12) installed in its groove. The eight electric telescopic rods (9) are divided into four groups. Each group of electric telescopic rods (9) has a fixing frame (13) fixed between its outer surfaces. Each fixing frame (13) has an L-shaped frame (14) fixed at its bottom. Each L-shaped frame (14) is bolted to the inner wall of the second annular groove (15). Each mounting plate (11) has a micro vibrator (19) installed at its bottom. The upper mold (2) has four punch heads (16) fixed at its bottom. The lower mold (1) has four discharge slots (17) at its bottom inner wall. Each discharge slot (17) has a guide hole (18) at its bottom inner wall. The upper mold (2) has a rectangular groove (20) on its top. Multiple micro negative pressure pumps (21) are installed on the bottom of the inner wall of the rectangular groove (20). Each micro negative pressure pump (21) has a connecting pipe (22) installed at its air inlet end. A filter screen (23) is installed on the top of the upper mold (2). Multiple feed slots (24) are evenly distributed on the bottom of the upper mold (2). A third annular groove (25) is opened between the top of the inner walls of the multiple feed slots (24). The air inlet end of each connecting pipe (22) is fixedly inserted through the bottom of the inner wall of the rectangular groove (20), and the air inlet end of each connecting pipe (22) extends into the interior of the third annular groove (25). L-shaped holes (26) are opened on both sides of the lower mold (1). A first sealing gasket (27) is movably fitted inside each of the two L-shaped holes (26). A push block (28) is bonded to the top of each of the two first sealing gaskets (27). Push blocks (28) are movably fitted inside the two L-shaped holes (26). Support frames (29) are fixed at the bottom of the inner walls of the two L-shaped holes (26). A set of L-shaped limiting blocks (30) are fixed on both sides of the lower mold (1), and there are two L-shaped limiting blocks (30) in each set. A second sealing gasket (31) is movably fitted inside the two L-shaped holes (26). A T-shaped block (32) is bonded to the opposite side of the two second sealing gaskets (31). The opposite side of the two T-shaped blocks (32) is movably fitted inside the two L-shaped holes (26). Multiple springs (33) are fixedly installed on the opposite side of the two T-shaped blocks (32). One end of each spring (33) is fixedly installed on the outer surface of the lower mold (1). Heat dissipation holes (34) are opened on both sides of the inner wall of the second annular groove (15). Dustproof nets (35) are installed inside the two heat dissipation holes (34).

Images