Inner cover mold

Abstract

The inner cover mold comprises a lower mold body, a first movable mold body, a second movable mold body, a first insert, a second insert, a first sheet body, a second sheet body and an upper mold body, the upper end of the lower mold body is connected with an inner mold body, the first movable mold body and the second movable mold body are arranged on the two sides of the inner mold body respectively, and the first movable mold body and the second movable mold body are both slidably connected to the upper end of the lower mold body; the sliding directions of the first movable mold and the second movable mold are parallel to each other, the first insert is detachably connected to the first movable mold, the second insert is detachably connected to the second movable mold, the first sheet body is detachably connected to the end, facing the inner mold, of the first insert, and the second sheet body is detachably connected to the end, facing the inner mold, of the second insert. And the lower die, the first insert, the second insert, the first sheet body, the second sheet body and the upper die are assembled to form a cavity. And after the sheet body is worn, only the sheet body needs to be replaced independently without scrapping the whole movable mold, so that the service life of the mold is prolonged.

Description

Technical Field

[0001] This application relates to the field of inner cap manufacturing, and particularly to an inner cap mold. Background Art

[0002] The inner cap is a sealing component inside the bottle mouth, usually used in conjunction with the bottle cap (outer cap) to enhance sealing performance, prevent leakage, protect against moisture, or preserve freshness.

[0003] The inner cap mold for the bottle body is used to produce various plastic or rubber inner caps, and its design directly affects the sealing performance, durability, and production efficiency of the inner cap. The inner cap mold usually adopts injection molding or compression molding processes, including a cavity, a core, an ejection system, a cooling system, and a runner system, etc.

[0004] The outer wall of the inner cap is usually provided with grooves for mating with the outer cap. During the injection molding process, the inner wall of the movable mold is designed with a convex ring, so that the molten plastic forms corresponding grooves after cooling.

[0005] However, since the convex ring is in direct contact with the high-temperature and high-pressure plastic melt, it is prone to wear, deformation, or even fracture after long-term use, resulting in a shortened mold life and increased maintenance costs. Summary of the Invention

[0006] In order to extend the service life of the mold, this application provides an inner cap mold.

[0007] The inner cap mold provided by this application adopts the following technical solutions: An inner cap mold includes a lower mold, a first movable mold, a second movable mold, a first insert block, a second insert block, a first sheet body, a second sheet body, and an upper mold. The upper end of the lower mold is connected with an inner mold. The first movable mold and the second movable mold are respectively arranged on both sides of the inner mold. The first movable mold and the second movable mold are both slidably connected to the upper end of the lower mold. The sliding directions of the first movable mold and the second movable mold are parallel to each other. The first insert block is detachably connected to the first movable mold. The second insert block is detachably connected to the second movable mold. The first sheet body is detachably connected to one end of the first insert block facing the inner mold. The second sheet body is detachably connected to one end of the second insert block facing the inner mold. The lower mold, the first insert block, the second insert block, the first sheet body, the second sheet body, and the upper mold are closed to form a cavity.

[0008] By adopting the above technical solutions, only the sheet body needs to be replaced separately after the sheet body is worn, and there is no need to scrap the entire movable mold, thus extending the service life of the mold.

[0009] Preferably, the upper end of the first movable mold is provided with a first installation groove, the first insert block is detachably connected to the bottom of the first installation groove, the upper end of the second movable mold is provided with a second installation groove, and the second insert block is detachably connected to the bottom of the second installation groove.

[0010] By adopting the above technical solution, the first insert is positioned and installed in the first installation groove, and the second insert is positioned and installed in the second installation groove, thereby improving the installation efficiency of the first insert and the second insert.

[0011] Preferably, the first insert is provided with a first anti-slip opening at one end facing the inner mold, and a first disassembly opening is provided at one end of the first insert away from the inner mold, the first anti-slip opening and the first disassembly opening are connected to each other, the first sheet body includes a first molding sheet and a first connecting sheet, the first molding sheet is slidably connected to the inner wall of the first anti-slip opening, the first connecting sheet is slidably connected to the inner wall of the first disassembly opening, the thickness of the first molding sheet is less than the thickness of the first connecting sheet, and the end of the first connecting sheet away from the first molding sheet is used to abut against the groove wall of the first installation groove.

[0012] By adopting the above technical solution, during the demoulding process, the first sheet is prevented from being separated from the first insert along with the inner cover, thereby improving the stability of the first sheet in use. The first mounting groove limits the first sheet to prevent the first sheet from sliding and affecting the production quality of the inner cover.

[0013] Preferably, it also includes a first blocking block, wherein the first insert is provided with a first jet port at one end facing the inner membrane, the first jet port faces the first sheet body, the first insert is provided with a first air channel, the first jet port is connected to the first air channel, the first blocking block is slidably connected to the inner wall of the first jet port, and the first blocking block is used to control the on and off of the first jet port.

[0014] By adopting the above technical solution, during injection molding, the first blocking block blocks the first jet port, and the gas in the first air channel expands due to heat and increases in volume. When the injection molding is completed, the first blocking block slides to connect the first jet port, and the gas in the first air channel is discharged, thereby reducing the adhesion between the inner cover and the first blade and improving the demoulding quality.

[0015] Preferably, it also includes a first sliding rod, a first spring and a first connecting rod, the upper end of the lower mold is fixedly connected with a boss, the boss is coaxially arranged on the outer periphery of the inner membrane, the lower end of the first insert is provided with a first avoidance groove, the first avoidance groove is used for the boss to be embedded, the groove wall of the first avoidance groove facing the inner membrane is provided with a first sliding opening, the first sliding rod is slidably connected to the inner wall of the first sliding opening, one end of the first spring is fixedly connected to the inner wall of the first sliding opening facing the inner membrane, the other end of the first spring is fixedly connected to the first sliding rod, one end of the first connecting rod is fixedly connected to the end of the first blocking block away from the inner membrane, the first connecting rod is connected to the first sliding rod through a connecting piece, and the sliding direction of the first connecting rod is opposite to that of the first blocking block.

[0016] By adopting the above technical solution, during the process of the first insert block approaching the inner membrane, the first sliding rod abuts against the convex platform, the first sliding rod slides within the sliding opening, and the first blocking block slides in the opposite direction, achieving the blocking of the first jet orifice, reducing the injection molding liquid from entering the jet orifice. When the first insert block moves away from the inner membrane, the first spring causes the first sliding rod to reset, and the first blocking block moves away from the first jet orifice, enabling the first jet orifice to eject gas and improving the demolding quality.

[0017] Preferably, the connecting member includes a first rack, a gear, and a second rack. The first insert block is provided with an installation cavity. The first sliding opening and the first air passage communicate with the installation cavity. The gear is rotatably connected to the inner wall of the first installation cavity around its own axis. The first rack is fixedly connected to the first sliding rod, and the second rack is fixedly connected to the first connecting rod. The first rack and the second rack are respectively engaged with both ends of the gear.

[0018] By adopting the above technical solution, when the first sliding rod moves, it can synchronously control the movement of the first connecting rod, which is simple to operate and convenient to control the first blocking block to tightly abut against the inner wall of the first jet orifice, improving the gas sealing quality.

[0019] Preferably, it further includes a first sealing ring. The outer wall of the first blocking block is provided with an annular groove. The first sealing ring is embedded in the annular groove. The first blocking block is provided with a passage. One end of the passage communicates with the bottom of the annular groove, and the other end of the passage faces away from the inner membrane.

[0020] By adopting the above technical solution, as the temperature of the gas in the air passage rises and the pressure increases, the first sealing ring is further pressed against the inner wall of the first jet orifice through the passage, improving the sealing performance.

[0021] Preferably, it further includes a first heat expansion block, which is fixedly connected to the inner wall of the first air passage.

[0022] By adopting the above technical solution, the first heat expansion block increases in volume when the temperature rises, realizing the pressurization of the gas in the first air passage, facilitating the subsequent blowing of gas, reducing the adhesion between the inner cover and the first blade, and improving the demolding efficiency.

[0023] Preferably, it further includes an air pipe and an air valve. The upper end of the inner membrane is provided with an air outlet. The lower mold is provided with an installation cavity. The air outlet communicates with the installation cavity. The air pipe is connected within the installation cavity, and the air valve is connected to the air pipe.

[0024] By adopting the above technical solution, the air pipe and the air valve are provided. During demolding, compressed air is blown out from the air outlet, improving the demolding efficiency.

[0025] Preferably, it further includes an air pipe, an air valve, a cover plate and a tension spring. An embedding groove is provided on the outer wall of the inner mold. An air outlet is provided at the bottom of the embedding groove. The inner mold is provided with a placement cavity. The air outlet communicates with the placement cavity. The air pipe is arranged in the placement cavity. The air pipe is fixedly connected to the lower mold. The air valve is connected to the air pipe. The air pipe is connected to an external air supply assembly. The air valve is used to control the on-off of the air pipe. The cover plate is used to be slidably embedded in the embedding groove. One end of the tension spring is fixedly connected to the inner wall of the air outlet, and the other end of the tension spring is fixedly connected to the cover plate.

[0026] By adopting the above technical solution, when the upper and lower molds are separated, the air valve is opened, the air pipe discharges air, and the air outlet discharges air, which is convenient for demolding.

[0027] In summary, the present application includes at least one of the following beneficial technical effects: 1. After the sheet body is worn, only the sheet body needs to be replaced separately, and there is no need to scrap the entire moving mold, which prolongs the service life of the mold; 2. During injection molding, the first plugging block plugs the first air jet port, and the gas in the first air passage expands due to heat and increases in volume. When the injection molding is completed, the first plugging block slides to make the first air jet port communicate, and the gas in the first air passage is discharged, reducing the adhesion between the inner cover and the first blade and improving the demolding quality; 3. The temperature of the gas in the air passage rises and the pressure increases. Through the channel, the first sealing ring further presses against the inner wall of the first air jet port, improving the sealing performance. Description of the Drawings

[0028] Figure 1 is a cross-sectional view of an inner cover mold.

[0029] Figure 2 is a schematic diagram of the overall structure of the lower mold, the first moving mold, the first insert block, the first sheet body and the auxiliary assembly.

[0030] Figure 3 is Figure 1 an enlarged view of part A in

[0031] Figure 4 is Figure 1 an enlarged view of part B in

[0032] Figure 5 is a cross-sectional view of the first insert block, the first sheet body and the auxiliary assembly.

[0033] Explanation of the reference numerals: 1. lower mold; 11. fixing groove; 12. boss; 121. assembly port; 13. inner mold; 131. embedding groove; 132. air outlet; 133. placement cavity; 2. first movable mold; 21. first installation groove; 211. first positioning groove; 212. first connecting groove; 3. second movable mold; 31. second installation groove; 311. second positioning groove; 312. second connecting groove; 4. first insert; 41. first positioning block; 42. first avoidance groove; 421. first sliding port; 43. first anti-slip port; 44. first disassembly and assembly port; 45. first jet port; 451. guide port; 452. control port; 453. channel port; 46. first air duct; 47. connecting port; 48. installation cavity; 5. second insert; 51. second fixing block Position block; 52, second avoidance groove; 53, second anti-slip opening; 54, second disassembly and assembly opening; 6, first sheet; 61, first molding sheet; 62, first connecting sheet; 7, second sheet; 71, second molding sheet; 72, second connecting sheet; 8, upper mold; 81, injection port; 82, cavity; 9, auxiliary component; 91, first blocking block; 911, ring groove; 912, channel; 92, first sealing ring; 93, first heat expansion block; 94, first sliding rod; 95, first spring; 96, first connecting rod; 961, convex strip; 97, synchronization ring; 98, connecting piece; 981, first rack; 982, gear; 983, second rack; 99, demoulding piece; 991, air pipe; 992, air valve; 993, covering plate; 994, tension spring. DETAILED DESCRIPTION

[0034] The following is combined with Figure 1-5 This application is described in further detail.

[0035] The present application embodiment discloses an inner cover mold. Figure 1 An inner cover mold includes a lower mold 1, a first movable mold 2, a second movable mold 3, a first insert 4, a second insert 5, a first sheet body 6, a second sheet body 7, an upper mold 8 and an auxiliary component 9.

[0036] A fixing groove 11 is provided at the upper end of the lower mold 1, and a boss 12 is fixedly connected to the groove wall of the fixing groove 11. The upper end of the boss 12 extends out of the lower mold 1. The boss 12 is coaxially provided with an assembly port 121. The inner wall of the assembly port 121 is fixedly connected to an inner mold 13. The height of the upper end of the inner mold 13 is greater than the height of the boss 12. The boss 12 is coaxially arranged with the fixing groove 11, and the inner mold 13 is coaxially arranged with the assembly port 121.

[0037] Reference Figure 1The first movable mold 2 and the second movable mold 3 are respectively arranged on both sides of the inner mold 13, and the first movable mold 2 and the second movable mold 3 are both slidably connected to the upper end of the lower mold 1, and the sliding directions of the first movable mold 2 and the second movable mold 3 are parallel to each other. One end of the first movable mold 2 and the second movable mold 3 facing the boss 12 is used to fit the outer wall of the boss 12, and the first movable mold 2 and the second movable mold 3 can enclose the boss 12.

[0038] Reference Figure 2 and Figure 3 A first mounting groove 21 is provided at the upper end of the first movable mold 2, a first positioning groove 211 is provided at the bottom of the first mounting groove 21, a first positioning block 41 is fixedly connected to one end of the first insert 4, the first positioning groove 211 is used for the first positioning block 41 to be embedded, a first connecting groove 212 is provided at the bottom of the first mounting groove 21, the first insert 4 is fixedly connected to the groove wall of the first connecting groove 212 by bolts, a first avoidance groove 42 is provided at the lower end of the first insert 4, the groove bottom of the first avoidance groove 42 is slidably connected to the upper end surface of the boss 12, the groove wall of the first avoidance groove 42 is used to fit the outer wall of the boss 12, the upper end of the first insert 4 is used to abut the upper mold 8, and the outer wall of the first insert 4 abuts the groove wall of the first mounting groove 21.

[0039] Reference Figure 2 and Figure 4 A second mounting groove 31 is provided at the upper end of the second movable mold 3, a second positioning groove 311 is provided at the bottom of the second mounting groove 31, a second positioning block 51 is fixedly connected to one end of the second insert 5, the second positioning groove 311 is used for the second positioning block 51 to be embedded, a second connecting groove 312 is provided at the bottom of the second mounting groove 31, the second insert 5 is fixedly connected to the groove wall of the second connecting groove 312 by bolts, a second avoidance groove 52 is provided at the lower end of the second insert 5, the groove bottom of the second avoidance groove 52 is slidably connected to the upper end surface of the boss 12, the groove wall of the second avoidance groove 52 is used to fit the outer wall of the boss 12, and the outer wall of the second insert 5 abuts against the groove wall of the second mounting groove 31.

[0040] Reference Figure 3 The first insert 4 is provided with a first anti-slip opening 43 at one end facing the inner mold 13, the height of the first anti-slip opening 43 is greater than the height of the first avoidance groove 42, and the first insert 4 is provided with a first disassembly opening 44 at one end away from the inner mold 13, and the first anti-slip opening 43 and the first disassembly opening 44 are connected to each other. The first sheet body 6 includes a first molding sheet 61 and a first connecting sheet 62, the first molding sheet 61 is slidably connected to the inner wall of the first anti-slip opening 43, the first connecting sheet 62 is slidably connected to the inner wall of the first disassembly opening 44, the width of the first anti-slip opening 43 is smaller than the width of the first disassembly opening 44, the thickness of the first molding sheet 61 is smaller than the thickness of the first connecting sheet 62, and the end of the first connecting sheet 62 away from the first molding sheet 61 is used to abut against the groove wall of the first installation groove 21.

[0041] Reference Figure 1 andFigure 4 The second insert 5 is provided with a second anti-slip opening 53 at one end facing the inner mold 13, the height of the second anti-slip opening 53 is greater than the height of the second avoidance groove 52, and the second insert 5 is provided with a second disassembly opening 54 at one end facing away from the inner mold 13, and the second anti-slip opening 53 and the second disassembly opening 54 are connected to each other. The second sheet 7 includes a second molding sheet 71 and a second connecting sheet 72, the second molding sheet 71 is slidably connected to the inner wall of the second anti-slip opening 53, the second connecting sheet 72 is slidably connected to the inner wall of the second disassembly opening 54, the width of the second anti-slip opening 53 is smaller than the width of the second disassembly opening 54, the thickness of the second molding sheet 71 is smaller than the thickness of the second connecting sheet 72, and the end of the second connecting sheet 72 facing away from the second molding sheet 71 is used to abut against the groove wall of the second installation groove 31.

[0042] Reference Figure 1 and Figure 3 When the first insert 4 abuts against the second insert 5, the first sheet 6 abuts against the second sheet 7. The lower mold 1, the first insert 4, the second insert 5, the first sheet 6, the second sheet 7 and the upper mold 8 form a cavity 82 when the lower mold 1, the first insert 4, the second insert 5, the first sheet 6, the second sheet 7 and the upper mold 8 are molded together. The upper mold 8 is provided at the injection port 81, and the injection port 81 is connected to the cavity 82.

[0043] Reference Figure 3 and Figure 5 The auxiliary component 9 includes a first blocking block 91 , a first sealing ring 92 , a first heat expansion block 93 , a first sliding rod 94 , a first spring 95 , a first connecting rod 96 , a synchronizing ring 97 , a connecting piece 98 and a demoulding piece 99 .

[0044] Reference Figure 2 and Figure 5 The first insert 4 is provided with a first jet port 45 at one end facing the inner mold 13. The first jet port 45 includes a guide port 451, a control port 452 and a channel port 453. The two ends of the control port 452 are respectively connected to the guide port 451 and the channel port 453. The opening of the guide port 451 faces the first sheet 6. The diameter of the control port 452 is horizontal and decreases as it approaches the inner mold 13. The channel port 453 is coaxially arranged with the control port 452, and the diameter of the channel port 453 is greater than the diameter of the control port 452. There are two groups of first jet ports 45, which are respectively arranged on the upper and lower sides of the first sheet 6. Each group of first jet ports 45 is provided with a plurality of first jet ports 45, and the plurality of first jet ports 45 are evenly spaced around the axis of the inner mold 13. The first insert 4 is provided with a first air channel 46. There are two first air channels 46, which are respectively arranged on the upper and lower sides of the first sheet 6. The plurality of first jet ports 45 are all connected to the first air channel 46. The first insert 4 is provided with a connection port 47 . The connection port 47 is provided on the outer periphery of the first sheet 6 . The connection port 47 is connected to the two first air passages 46 .

[0045] The first plugging block 91 is used to control the on-off of the control port 452. The diameter of the first plugging block 91 decreases as it approaches the diversion port 451. A ring groove 911 is coaxially provided on the outer wall of the first plugging block 91, and the first sealing ring 92 is embedded in the ring groove 911. The first plugging block 91 is provided with a channel 912. One end of the channel 912 communicates with the bottom of the ring groove 911, and the other end of the channel 912 faces away from the inner mold 13. The channel 912 communicates with the first air duct 46. There are multiple channels 912, and the multiple channels 912 are evenly spaced around the axis of the first plugging block 91. The first heat-expandable block 93 is fixedly connected to the inner wall of the first air duct 46 facing the first jet port 45.

[0046] Referring to Figure 2 and Figure 5 , on the groove wall of the first avoidance groove 42 facing the inner mold 13, there is a first sliding port 421. The first sliding rod 94 is slidably connected to the inner wall of the first sliding port 421. One end of the first spring 95 is fixedly connected to the inner wall of the first sliding port 421 facing the inner mold 13, and the other end of the first spring 95 is fixedly connected to the first sliding rod 94. One end of the first connecting rod 96 is fixedly connected to the end of the first plugging block 91 facing away from the inner mold 13. A convex strip 961 is fixedly connected to the outer wall of the first connecting rod 96. The convex strip 961 is slidably connected to the inner wall of the channel port 453. There are multiple first connecting rods 96, and the first connecting rods 96 are arranged in one-to-one correspondence with the first plugging blocks 91. The synchronous ring 97 is fixedly connected to the multiple first connecting rods 96. The synchronous ring 97 passes through the first air duct 46 and the connection port 47. The synchronous ring 97 is connected to the first sliding rod 94 through a connecting member 98. The sliding directions of the first connecting rod 96 and the first plugging block 91 are opposite.

[0047] Referring to Figure 5 , the connecting member 98 includes a first rack 981, a gear 982, and a second rack 983. The first insert block 4 is provided with an installation cavity 48. The first sliding port 421 and the first air duct 46 both communicate with the installation cavity 48. The gear 982 is rotatably connected to the inner wall of the first installation cavity 48 around its own axis. The first rack 981 is fixedly connected to the first sliding rod 94, and the second rack 983 is fixedly connected to the synchronous ring 97. The first rack 981 and the second rack 983 are respectively engaged with both ends of the gear 982.

[0048] Referring to Figure 1 and Figure 3, the demolding member 99 includes an air pipe 991, a pneumatic valve 992, a cover plate 993 and a tension spring 994. An embedded groove 131 is provided on the outer wall of the inner mold 13, an air outlet 132 is provided at the bottom of the embedded groove 131, the inner mold 13 is provided with a placement cavity 133, the air outlet 132 communicates with the placement cavity 133, the placement cavity 133 communicates with the fixed groove 11, the air pipe 991 is arranged in the placement cavity 133, the air pipe 991 is fixedly connected to the lower mold 1, the pneumatic valve 992 is connected to the air pipe 991, the air pipe 991 is connected to an external air supply component, the pneumatic valve 992 is used to control the on-off of the air pipe 991, the cover plate 993 is used to slidably fit into the embedded groove 131, and one end of the tension spring 994 is fixedly connected to the inner wall of the air outlet 132, and the other end of the tension spring 994 is fixedly connected to the cover plate 993.

[0049] There are multiple auxiliary components 9, and the auxiliary components 9 are provided on both the first insert block 4 and the second insert block 5, and the auxiliary components 9 on the first insert block 4 and the second insert block 5 are symmetrically arranged.

[0050] The implementation principle of an inner cover mold in an embodiment of the present application is as follows: when the first sheet body 6 is worn, the first insert block 4 is disassembled, the first sheet body 6 is slid, the first sheet body 6 is replaced separately and then the first insert block 4 is reinstalled. During use, when the mold is closed, the first sliding rod 94 drives the first plugging block 91 to slide through the connecting piece 98 to plug the first air jet port 45. During injection molding, the temperature of the first insert block 4 rises, the temperature of the gas in the first air passage 46 rises, the first heat expansion block 93 expands due to heat, and the first sealing ring 92 further seals the first plugging block 91 and the inner wall of the first air jet port 45. After injection molding is completed, during the process of separating the upper and lower molds 1, the first spring 95 causes the first sliding rod 94 to start resetting, the first plugging block 91 starts to reset, the first air jet port 45 exhausts air from the first sheet body 6 to reduce adhesion. After contacting the air, the temperature of the first insert block 4 drops, the first air jet port 45 intakes air to supplement air to the first air passage 46 for repeated use. The pneumatic valve 992 is opened, the air pipe 991 discharges air, overcoming the pulling force of the tension spring 994, the cover plate 993 moves away from the inner mold 13, and the combined action of the cover plate 993 and the gas impact causes the inner cover to move away from the inner mold 13 to complete demolding.

[0051] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereby. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application should be covered within the protection scope of the present application.

Claims

1. An inner cover mold, characterized in that: The invention comprises a lower mold (1), a first movable mold (2), a second movable mold (3), a first insert (4), a second insert (5), a first sheet (6), a second sheet (7) and an upper mold (8); the upper end of the lower mold (1) is connected to an inner mold (13); the first movable mold (2) and the second movable mold (3) are respectively arranged on both sides of the inner mold (13); the first movable mold (2) and the second movable mold (3) are both slidably connected to the upper end of the lower mold (1); and the sliding directions of the first movable mold (2) and the second movable mold (3) are parallel to each other. The first insert (4) is detachably connected to the first movable mold (2), the second insert (5) is detachably connected to the second movable mold (3), the first sheet (6) is detachably connected to one end of the first insert (4) facing the inner mold (13), the second sheet (7) is detachably connected to one end of the second insert (5) facing the inner mold (13), and the lower mold (1), the first insert (4), the second insert (5), the first sheet (6), the second sheet (7) and the upper mold (8) are combined to form a cavity (82).

2. The inner cover mold according to claim 1, characterized in that: A first mounting groove (21) is provided at the upper end of the first movable mold (2), and the first insert (4) is detachably connected to the bottom of the first mounting groove (21). A second mounting groove (31) is provided at the upper end of the second movable mold (3), and the second insert (5) is detachably connected to the bottom of the second mounting groove (31).

3. The inner cover mold according to claim 2, characterized in that: The first insert (4) is provided with a first anti-slip opening (43) at one end facing the inner mold (13), and a first disassembly opening (44) is provided at one end of the first insert (4) facing away from the inner mold (13). The first anti-slip opening (43) and the first disassembly opening (44) are communicated with each other. The first sheet (6) comprises a first forming sheet (61) and a first connecting sheet (62). The first forming sheet (61) is slidably connected to the inner wall of the first anti-slip opening (43), and the first connecting sheet (62) is slidably connected to the inner wall of the first disassembly opening (44). The thickness of the first forming sheet (61) is smaller than the thickness of the first connecting sheet (62). The end of the first connecting sheet (62) facing away from the first forming sheet (61) is used to abut against the groove wall of the first installation groove (21).

4. A kind of inner cover mold according to claim 1, characterized in that: The invention also comprises a first blocking block (91); a first jet port (45) is provided at one end of the first insert (4) facing the inner mold (13); the first jet port (45) faces the first sheet (6); the first insert (4) is provided with a first air channel (46); the first jet port (45) is connected to the first air channel (46); the first blocking block (91) is slidably connected to the inner wall of the first jet port (45); the first blocking block (91) is used to control the on and off of the first jet port (45).

5. The inside cover mold according to claim 4, characterized in that: The invention also comprises a first sliding rod (94), a first spring (95) and a first connecting rod (96); the upper end of the lower mold (1) is fixedly connected with a boss (12); the boss (12) is coaxially arranged on the outer periphery of the inner mold (13); the lower end of the first insert (4) is provided with a first avoidance groove (42); the first avoidance groove (42) is used for the boss (12) to be embedded; the groove wall of the first avoidance groove (42) facing the inner mold (13) is provided with a first sliding opening (421); the first sliding rod (94) is slidably connected to the first sliding rod (94); The first spring (95) is fixedly connected to the inner wall of the first sliding opening (421) facing the inner mold (13), and the other end of the first spring (95) is fixedly connected to the first sliding rod (94). One end of the first connecting rod (96) is fixedly connected to an end of the first blocking block (91) facing away from the inner mold (13). The first connecting rod (96) is connected to the first sliding rod (94) via a connecting member (98). The sliding directions of the first connecting rod (96) and the first blocking block (91) are opposite.

6. The inner cover mold according to claim 5, characterized in that: The connecting member (98) includes a first rack (981), a gear (982) and a second rack (983); the first insert (4) is provided with a mounting cavity (48); the first sliding opening (421) and the first air passage (46) are connected to the mounting cavity (48); the gear (982) is connected to the inner wall of the first mounting cavity (48) by rotating around its own axis; the first rack (981) is fixedly connected to the first sliding rod (94); the second rack (983) is fixedly connected to the first connecting rod (96); the first rack (981) and the second rack (983) are respectively meshed with the two ends of the gear (982).

7. The inner cover mold according to claim 4, characterized in that: The first sealing block (91) further comprises a first sealing ring (92), an outer wall of the first sealing block (91) being provided with an annular groove (911), the first sealing ring (92) being embedded in the annular groove (911), the first sealing block (91) being provided with a channel (912), one end of the channel (912) being connected to the bottom of the annular groove (911), and the other end of the channel (912) being away from the inner mold (13).

8. A kind of inner cover mold according to claim 4, characterized in that: It also comprises a first heat expansion block (93), wherein the first heat expansion block (93) is fixedly connected to the inner wall of the first air channel (46).

9. The inner cover mold according to claim 1, characterized in that: It further includes a trachea (991), an air valve (992), a covering plate (993) and a tension spring (994). An embedding groove (131) is provided on the outer wall of the inner mold (13). An air outlet (132) is provided at the bottom of the embedding groove (131). The inner mold (13) is provided with a placement cavity (133). The air outlet (132) communicates with the placement cavity (133). The trachea (991) is arranged in the placement cavity (133). The trachea (991) is fixedly connected to the lower mold (1). The air valve (992) is connected to the trachea (991). The trachea (991) is connected to an external air supply component. The air valve (992) is used to control the on / off of the trachea (991). The covering plate (993) is used to be slidably embedded in the embedding groove (131). One end of the tension spring (994) is fixedly connected to the inner wall of the air outlet (132), and the other end of the tension spring (994) is fixedly connected to the covering plate (993).

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