A double-sided molding silicone gasket injection machine

Abstract

The present application relates to the technical field of silicone product forming, in particular to a double-sided forming silicone gasket injection machine, which comprises a gland module, a mold module, a driving assembly and a secondary compression group arranged inside the gland module. The gland module is composed of a first mold base and a second mold base, which are oppositely arranged, and the opposite surfaces thereof are provided with flexible injection runners. The mold module comprises a fixed mold and a movable mold, which are respectively slidably sleeved inside the two mold bases. The gas pressure cavity is internally provided with a gas bag and a piston sheet, which are used for secondary sealing and pressurization. The driving assembly comprises a fixed seat, a driving cylinder, an arc slide way and a column slide head, and the secondary compression group comprises a wedge sleeve block, a fixed block and a wedge rod, which are matched through the inclined sleeve hole to push the gas compression in the gas pressure cavity when the mold is closed, drive the piston sheet to push inward to realize the secondary pressurization of the mold cavity. The device combines mechanical injection with gas pressure compensation to realize the synchronous injection and uniform forming of double-sided silicone gaskets, and has the effects of consistent forming thickness, high sealing precision and excellent air tightness of finished products.

Description

Technical Field

[0001] This invention relates to the field of silicone product molding technology, specifically to a double-sided silicone pad injection molding machine. Background Technology

[0002] Currently, silicone gaskets are widely used in electronic sealing, medical devices, precision machinery, and liquid pipelines. Their sealing performance and molding precision directly affect the overall airtightness and stability of the product. Existing injection molding equipment for silicone gaskets mainly employs single-sided injection or single-shot injection molding processes. This involves injecting liquid silicone into the mold cavity through a single injection chamber and then pressure-curing it after the mold is closed. These structures typically only have a single injection and mold-locking function, and the flow and distribution of the silicone liquid within the mold cavity depend entirely on the initial injection pressure and the uniformity of the mold cavity's venting channels.

[0003] In existing equipment, common silicone gasket injection molding machines generally include a fixed mold, a moving mold, and an injection assembly. The injection system injects silicone into the mold cavity through an injection tube. However, due to the high viscosity and delayed curing characteristics of silicone material, single injection molding often leads to the following problems:

[0004] (1) Uneven flow of adhesive in the cavity causes differences in gasket thickness, incomplete edge coverage, or hollow center.

[0005] (2) The injection pressure is easily attenuated during transmission, making it difficult to ensure synchronous sealing and thickness consistency during molding on both sides;

[0006] (3) After the mold is closed, the gas is restricted from being discharged, which can easily form bubbles or sandwiches on the surface of the gasket, reducing the sealing performance of the finished product.

[0007] Furthermore, traditional structures often employ rigid pressure heads or fixed mold cavities for filling, lacking a secondary dynamic pressure compensation mechanism. Because there are no flexible pressure units such as air chambers or air bladders, the mold cannot adaptively adjust the pressure according to changes in the volume of the adhesive during the curing process. This results in insufficient molding pressure in localized areas, leading to issues such as misalignment of sealing edges, thickness deviations, or localized cracking.

[0008] Some existing improved equipment attempts to apply secondary pressure by adding mechanical push rods or electric pressing components. However, such structures are limited by the rigidity of the mechanism and the driving response speed, making it difficult to achieve continuous and uniform pressure compensation during injection and curing. Furthermore, mechanical pressing has a significant impact on the stress distribution inside the mold, which can easily lead to mold deformation or reduced lifespan.

[0009] In view of this, we have studied and improved the existing problems and provided a double-sided silicone pad injection molding machine to solve the current problems. Summary of the Invention

[0010] The present invention aims to solve one of the technical problems existing in the prior art or related technologies.

[0011] Therefore, the technical solution adopted by the present invention is: a double-sided molding silicone pad injection machine, including a capping module, a molding module, a drive assembly, and a secondary pressing assembly.

[0012] The invention comprises a capping module for supporting and guiding mold alignment, a molding module for forming the main molding cavity of the silicone gasket, a drive assembly for mechanical injection and directional pressing of the injection cavity, and a secondary pressure assembly for replenishing the air pressure within the mold cavity during the molding stage, achieving simultaneous injection and combined air pressure molding of double-sided silicone gaskets. Through the synergistic effect of these structures, the invention enables a fully automated cyclic molding process of venting, injection, pressure replenishment, curing, and demolding in a single mold closing operation, achieving high molding accuracy and high production efficiency. The silicone gasket injection molding machine of this invention includes a capping module, a molding module, a drive assembly, and a secondary pressure assembly arranged inside the capping module.

[0013] The capping module includes a first mold base and a second mold base, which are arranged opposite each other to form a mold closing mechanism. The opposite surfaces of the two mold bases are provided with flexible injection channels for the introduction and distribution of silicone raw materials.

[0014] The molding assembly includes a fixed mold and a moving mold, which are slidably fitted onto the inner sides of the first mold base and the second mold base, respectively. The opposing surfaces of the fixed mold and the moving mold form the main molding structure, which includes a gasket cavity, an injection cavity, and an injection tube, and air pressure chambers are provided on both sides of the cavity.

[0015] The fixed mold and the moving mold are equipped with air bladders and slidingly mounted piston plates for sealing and pressurizing during the molding stage.

[0016] The drive assembly is located on one side of the first mold base and includes a fixed base, an arc slide, a column slide head, a pressure head block, a connecting rod, and a guide rod. The pressure head block can enter the end of the injection cavity for directional pressurization. The drive cylinder and the slider cooperate to achieve a linear-arc composite thrust.

[0017] The secondary pressure unit is installed inside the pressure cap module and includes a wedge sleeve block, a fixed block, and a wedge rod. It is used to generate a pneumatic pressure boosting effect when the mold is closed, driving the piston plate inside the airbag to push inward.

[0018] Specifically, by combining mechanical and pneumatic composite drive structures, synchronous double-sided injection, stable cavity sealing, and self-adjusting molding pressure are achieved, significantly improving the sealing accuracy and filling consistency of silicone gaskets.

[0019] In a preferred example, the injection tube, injection cavity, and gasket cavity between the opposing surfaces of the fixed mold and the moving mold are sequentially connected, and the injection channel is a flexible tubular structure that is fixedly connected to the injection tube port by threaded connection or embedding method.

[0020] The injection channel delivers the silicone material from the external injection system to the injection chamber, and then into the gasket cavity, where it is pushed and injected by the pressure head block.

[0021] Specifically, the multi-level interconnected structure enables continuous introduction and automatic venting of silicone material, effectively preventing molding dead corners and bubble formation, and ensuring the flatness of the gasket surface and the density of the material.

[0022] In a preferred example, the airbags are arranged vertically on both sides of the gasket cavity, located inside the fixed mold and the moving mold, respectively.

[0023] The piston plate is slidably installed inside the air bladder, and its outer edge is sealed and fitted to the inner wall of the air bladder. When the air pressure chamber is pressurized, the piston plate generates axial thrust, which forms a secondary extrusion compensation on the adhesive in the mold cavity.

[0024] Specifically, it achieves automatic adjustment and uniform pressurization of the mold cavity air pressure, ensuring that the molding thickness error is less than 0.05mm, and effectively preventing local unsealing.

[0025] In a preferred example, a connecting groove is provided between the injection cavity and the gasket cavity for secondary flow of the adhesive and pressure equalization.

[0026] When the pressure head block is fully inserted into the injection chamber, its front end face seals against the port of the connecting groove, and the outer periphery of the column slide head fits and seals against the port of the injection chamber.

[0027] Specifically, the injection stage creates a completely closed injection environment to prevent the glue from flowing back and mixing with air, ensuring the glue filling density and the quality of the molded edges.

[0028] In a preferred embodiment, the injection tube contains a one-way valve body, preferably a resilient valve plate or a ball valve. This valve body allows the adhesive to enter the injection chamber in only one direction, preventing backflow. It maintains stable injection pressure, prevents backflow during the secondary filling stage, ensures smooth and controllable injection, and improves mold filling consistency.

[0029] In a preferred example, the arc-shaped guide rail is an arc-shaped guide groove, and one end of the guide rod is fixed to the center of the arc-shaped guide rail by a pivot. The pressure head block is an arc-shaped bend structure, which can move along the direction of the arc-shaped guide rail and achieve precise angle propulsion under the constraint of the guide rod.

[0030] Specifically, it achieves precise control of injection direction and stable transmission of pressure, resulting in uniform pressure distribution at the injection cavity port, improving the efficiency of adhesive injection and the balance of double-sided molding.

[0031] In a preferred example, a drive cylinder is mounted on the surface of the fixed base. The output end of the drive cylinder is connected to a slider, which drives the column slide head to slide along an arc-shaped slide path, allowing the pressure head block to enter the injection chamber. Precise control of the drive cylinder enables programmable injection stroke and pressure settings.

[0032] In a preferred example, the secondary pressure assembly includes a wedge block, a fixed block, and a wedge rod, with the surface of the wedge block having a wedge pressing port and an inclined sleeve hole.

[0033] When the mold is closed, the wedge rod is inserted into the wedge sleeve block, causing the wedge sleeve block to slide, so that the wedge pressure port enters the air pressure chamber, the gas is compressed and enters the air bladder, causing the piston plate to slide inward.

[0034] Specifically, a secondary pressurization mode is formed by superimposing mechanical drive and air pressure, which uniformly increases the internal pressure of the mold cavity, significantly enhancing the molding sealing and edge integrity.

[0035] The beneficial effects achieved by this invention are as follows:

[0036] 1. In this invention, the dual-mold base structure of the capping module and the mold module realizes the synchronous engagement and venting pre-filling control between the fixed mold and the moving mold. The multi-stage flow guiding design of the injection channel and injection tube can automatically vent and uniformly fill the mold in the early stage of injection, ensuring the stable flow and uniform sealing of the silicone liquid in the gasket cavity, thereby effectively avoiding bubbles, voids and incomplete filling, and improving the molding quality and finished product density.

[0037] 2. In this invention, the mechanical arc injection mechanism formed by the drive cylinder, arc slide, and column slide head in the drive assembly realizes the precise control of the injection direction and depth of the pressure head block along the arc slide, so that the glue in the injection cavity is pushed twice. Combined with the synchronous compensation of the air pressure formed by the wedge sleeve block entering the air pressure chamber, the piston plate is driven to move and squeeze, which significantly improves the thickness consistency and sealing accuracy of double-sided injection molding.

[0038] 3. In this invention, the pneumatic linkage structure formed by the secondary pressure unit, airbag, and piston plate automatically performs secondary pressurization and edge sealing after mold closing, forming a composite molding mechanism of "mechanical injection + pneumatic compensation". This not only improves the edge sealing strength of the silicone gasket, but also realizes the adaptive adjustment of the mold under high pressure. The overall structure is simple and compact, and the operation is reliable. It can effectively improve molding efficiency and product qualification rate, and is suitable for the mass production of silicone gaskets with multiple specifications and high sealing levels. Attached Figure Description

[0039] Figure 1 This is a schematic diagram of the overall structure of one embodiment of the present invention;

[0040] Figure 2 This is an exploded structural diagram of an embodiment of the present invention;

[0041] Figure 3 This is a schematic diagram of the first mold base and the surface structure of the fixed mold according to an embodiment of the present invention;

[0042] Figure 4 This is a schematic diagram of the fixed mold surface structure according to an embodiment of the present invention;

[0043] Figure 5 This is a schematic diagram of the cross-sectional structure of the fixed mold and the moving mold according to an embodiment of the present invention;

[0044] Figure 6 This is one embodiment of the present invention. Figure 5 A schematic diagram of the structure at point A;

[0045] Figure 7 This is a schematic diagram of the drive component structure according to an embodiment of the present invention;

[0046] Figure 8 This is an exploded view of the driving component according to an embodiment of the present invention;

[0047] Figure 9 This is a schematic diagram of a secondary pressure unit structure according to an embodiment of the present invention.

[0048] Figure label:

[0049] 100. Capping module; 110. First mold base; 111. Injection runner; 120. Second mold base;

[0050] 200. Molded module; 210. Fixed mold; 211. Gasket cavity; 212. Injection cavity; 213. Injection tube; 214. Air chamber; 215. Airbag; 216. Piston plate; 220. Moving mold;

[0051] 300. Drive assembly; 310. Mounting base; 311. Drive cylinder; 312. Slider; 320. Arc slide rail; 330. Column slide head; 331. Pressure head block; 332. Connecting rod; 333. Guide rod;

[0052] 400. Secondary pressure assembly; 410. Wedge sleeve block; 420. Fixed block; 430. Wedge rod. Detailed Implementation

[0053] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments and accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other.

[0054] It should be understood that these descriptions are merely exemplary and are not intended to limit the scope of the invention.

[0055] The following describes, with reference to the accompanying drawings, some embodiments of the present invention, providing a double-sided molding silicone pad injection machine.

[0056] Combination Figures 1-9As shown, the present invention provides a double-sided molding silicone gasket injection molding machine, comprising a capping module 100, a molding module 200, a drive assembly 300, and a secondary pressure assembly 400 arranged inside the capping module 100. The entire machine achieves simultaneous double-sided molding and secondary air pressure sealing of silicone gaskets through a combination of mechanical transmission, injection guidance, and air pressure. The capping module 100 includes a first mold base 110 and a second mold base 120, which are arranged opposite each other to form a mold closing mechanism. Flexible injection channels 111 are provided on the opposite surfaces of the first mold base 110 and the second mold base 120 for introducing and uniformly distributing silicone raw materials.

[0057] The mold module 200 includes a fixed mold 210 and a moving mold 220. The fixed mold 210 and the moving mold 220 are slidably sleeved on the inner sides of the first mold base 110 and the second mold base 120, respectively, and are positioned by means of guide rails.

[0058] The main molding space for the silicone gasket is formed on the opposite surfaces of the fixed mold 210 and the moving mold 220, which includes a gasket cavity 211, an injection cavity 212 and an injection tube 213 in sequence. The gasket cavity 211 is provided with symmetrically arranged air pressure chambers 214 on both sides.

[0059] The fixed mold 210 and the moving mold 220 are provided with an air bladder 215 that communicates with the air pressure chamber 214. A piston plate 216 is slidably installed in the air bladder 215 for secondary sealing and pressurization during the molding stage.

[0060] The drive assembly 300 is mounted on one side of the first mold base 110 and is used to drive the synchronous operation of the injection mechanism. The drive assembly 300 includes a fixed base 310, an arc slide 320, and a column slide head 330 that is slidably mounted inside the arc slide 320.

[0061] One end of the column slide head 330 is provided with a pressure head block 331, which is used to enter the injection chamber 212 and seal its port; a connecting rod 332 and a guide rod 333 are rotatably mounted on the surface of the column slide head 330, and one end of the guide rod 333 is hinged to the surface of the arc slide 320.

[0062] The drive assembly 300 achieves linear-arc composite motion through the cooperation of the drive cylinder 311 and the slider 312, thereby applying directional pressure to the injection chamber 212.

[0063] The secondary pressure unit 400 is installed inside the pressure cap module 100 and is used to generate a pneumatic pressure boosting effect when the first mold base 110 and the second mold base 120 move relative to each other, thereby driving the piston plate 216 to push inward and achieve secondary sealing of the cavity.

[0064] In this embodiment, the injection tube 213, injection cavity 212 and gasket cavity 211 between the opposite surfaces of the fixed mold 210 and the moving mold 220 are connected in sequence. The injection channel 111 is a flexible tubular structure, which is fixedly installed on the surface of the first mold base 110 and fixedly connected to the port of the injection tube 213 by means of thread or embedding.

[0065] The injection channel 111 is used to transport the silicone raw material of the external injection system to the injection chamber 212. The silicone liquid enters the gasket cavity 211 through the injection chamber 212 and is continuously injected under the push of the pressure head block 331.

[0066] This multi-level interconnected design allows for venting and pre-filling during the initial injection phase, preventing air bubbles from forming in molding dead zones.

[0067] In this embodiment, the airbags 215 are arranged vertically on both sides of the gasket cavity 211, located inside the fixed mold 210 and the moving mold 220 respectively.

[0068] The piston plate 216 is slidably installed on the inner side of the airbag 215, and its outer edge abuts against the inner wall of the airbag to form a seal, ensuring that axial thrust is generated when the air pressure chamber 214 is pressurized, thereby pressing the cavity walls of the fixed mold 210 and the moving mold 220.

[0069] This structure enables air pressure compensation and adaptive mold fitting, ensuring uniform thickness and complete edge closure during silicone pad molding.

[0070] In this embodiment, a connecting groove is provided between the injection cavity 212 and the gasket cavity 211 for the adhesive to continue flowing and pressurizing after injection.

[0071] When the pressure head 331 is fully inserted into the injection chamber 212 under the drive of the drive cylinder 311, its front end face seals against the port of the connecting groove, while the outer periphery of the column slide head 330 fits and seals against the port of the injection chamber 212. This structure ensures stable pressure during the injection stage, tight sealing of the flow channel, and effectively prevents backflow and gas entrainment.

[0072] In this embodiment, a one-way valve body is provided on the inner side of the injection tube 213 to control the silicone adhesive to flow into the injection chamber 212 only from the direction of the injection channel 111, and not to flow back in the opposite direction.

[0073] The one-way valve body achieves unidirectional flow through an elastic valve plate or ball valve assembly, ensuring stable pressure during injection and improving injection accuracy and mold filling consistency. In this embodiment, the arc slide 320 is an arc-shaped guide groove structure, and one end of the guide rod 333 is connected to a rotating shaft located at the axis of the arc slide 320.

[0074] The pressure head block 331 has an overall arc-shaped elbow structure. Under the constraint of the guide rod 333, it runs along the arc slide 320, which can accurately control the injection direction and force transmission angle.

[0075] Through this structure, the drive component 300 can convert linear thrust into arc motion, thereby achieving fixed-point pressurization and stable sealing at the end of the injection chamber 212.

[0076] In this embodiment, a drive cylinder 311 is fixedly mounted on the surface of the fixed base 310. The output end of the drive cylinder 311 is connected to a slider 312, and the slider 312 is fixedly connected to the cylindrical slider 330. When the drive cylinder 311 is activated, the slider 312 moves in a straight line and drives the cylindrical slider 330 to slide along the arc slide 320, thereby driving the pressure head block 331 into the injection chamber 212. By controlling the drive cylinder 311, the injection volume and thrust can be precisely adjusted to ensure that the injection molding pressure is constant for each injection.

[0077] In this embodiment, the secondary pressure assembly 400 includes a wedge sleeve block 410, a fixed block 420, and a wedge rod 430.

[0078] The wedge sleeve block 410 has a wedge pressing port 411 on one side, and the surface of the wedge sleeve block 410 has an oblique sleeve hole structure that matches the wedge rod 430.

[0079] The wedge rod 430 is fixedly installed on the surface of the fixed block 420, which is fixed to one side of the second mold base 120. The wedge sleeve block 410 is slidably installed on the surface of the first mold base 110. During the mold closing stage, the wedge rod 430 is inserted into the wedge sleeve block 410, causing the wedge sleeve block 410 to slide along the direction of the inclined sleeve hole. The wedge pressure port 411 is inserted into the air pressure chamber 214, pushing the gas inside the air pressure chamber 214 to be compressed.

[0080] Through the action of this mechanism, the air pressure inside the air chamber 214 and the air bag 215 can be increased, driving the piston plate 216 to slide along the cavity, thereby realizing secondary pressurization and sealing compensation of the gasket cavity 211.

[0081] After pressurization is completed, the wedge sleeve block 410 returns to its original position under the guidance of the wedge rod 430 when the mold separates, releasing the internal air pressure and completing one working cycle.

[0082] Specifically, this silicone gasket injection molding machine achieves double-sided injection molding and directional pressure molding of silicone material through the coordinated work of the capping module 100, molding module 200, drive assembly 300 and secondary pressure assembly 400, ensuring that the gasket has consistent shape on both sides, high sealing accuracy and good airtightness.

[0083] First, the fixed mold 210 and the moving mold 220 are closed. After the equipment is started, the first mold base 110 and the second mold base 120 form a mating structure, maintaining a certain gap between them for venting of the fixed mold 210 and the moving mold 220 during the initial injection molding. The fixed mold 210 and the moving mold 220 in the mold assembly 200 are respectively slidably sleeved inside the two mold bases, and the mold is closed by the mold locking mechanism. The opposing surfaces of the fixed mold 210 and the moving mold 220 constitute the main cavity structure for silicone gasket molding, which includes a gasket cavity 211, an injection cavity 212, an injection tube 213, and air pressure chambers 214 on both sides.

[0084] The drive assembly 300 is installed on one side of the first mold base 110 to transmit injection force and motion to the injection cavity 212 inside the fixed mold 210. The drive cylinder 311 pushes the slider 312 to slide within the fixed base 310, thereby driving the column slider 330 to move in an arc along the arc slide 320. The front end of the column slider 330 is equipped with a pressure block 331, which enters the injection cavity 212 during movement and seals against its port, using its end face pressure to achieve directional extrusion and injection of silicone material.

[0085] During the injection process, the injection channel 111 and injection tube 213 are used to transport the silicone liquid from the external injection molding system into the injection cavity 212, and initially enter the cavity 211 to expel the gas inside the cavity 211. Then, the fixed mold 210 and the moving mold 220 are further engaged and locked by the complete movement of the first mold base 110 and the second mold base 120. At the same time, the merging of the first mold base 110 and the second mold base 120 causes the wedge pressure port 411 to be inserted into the air pressure chambers 214 on both sides of the fixed mold 210 and the moving mold 220. The internal pressure of the air pressure chambers 214 and the air bladder 215 is increased by the gas compression. The piston plate 216 in the air bladder 215 slides along the cavity and pushes inward under high pressure, further pressurizing the cavity 211 and further increasing the filling pressure inside the gasket cavity 211; thus achieving secondary pressurization.

[0086] The injection cavity 212 is connected to the gasket cavity 211. The adhesive is evenly injected into the molding cavity under the push of the pressure head block 331, gradually filling the entire gasket cavity, thus realizing the injection molding of double-sided silicone gaskets.

[0087] After injection, the secondary pressure unit 400 is activated to enhance cavity sealing and air pressure compensation. This component includes a wedge sleeve block 410, a fixed block 420, and a wedge rod 430. The wedge rod 430 and the wedge sleeve block 410 adopt a slanted hole fit structure. After the mold base is closed, the wedge sleeve block 410 slides towards the first mold base 110, and its wedge pressure port 411 is inserted into the air pressure chambers 214 on both sides of the fixed mold 210 and the moving mold 220, increasing the internal pressure of the air pressure chambers 214 and the air bladder 215 through gas compression.

[0088] Operation process and work sequence

[0089] 1. Mold assembly and pre-filling stage: Install the fixed mold 210 and the moving mold 220 on the inner side of the first mold base 110 and the second mold base 120 respectively, keep them aligned and leave an exhaust gap.

[0090] 2. Injection stage: Silicone material enters injection cavity 212 through injection channel 111 and injection tube 213, pre-fills cavity 211 and vents air. After venting, first mold base 110 and second mold base 120 close the mold and extrude fixed mold 210 and moving mold 220 to further join and seal.

[0091] 3. Secondary pressurization stage: The wedge sleeve block 410 slides under the action of the wedge rod 430, and the wedge pressure port 411 enters the air pressure chamber 214, pushing the air bag 215 and piston plate 216 to pressurize, realizing the secondary molding of the cavity 211. At the same time, the drive cylinder 311 pushes the column slide head 330 to move along the arc slide 320, and the pressure head block 331 enters the injection chamber 212 and closes the port, pushing the glue inside the injection chamber 212 into the cavity 211 again, completing the secondary filling.

[0092] 4. Pressure relief and demolding stage:

[0093] After the adhesive has cured, the drive cylinder 311 reverses its direction, the pressure head block 331 exits the injection chamber 212; the wedge sleeve block 410 returns to its original position to release the air pressure; the first mold base 110 separates from the second mold base 120, the moving mold 220 exits and the silicone pad is removed.

[0094] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0095] Although embodiments of the invention have been shown and described, those skilled in the art will understand 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 claims and their equivalents.

Claims

1. A double-sided silicone pad injection molding machine, characterized in that, The device includes a capping module (100), a molding module (200), a drive assembly (300), and a secondary pressing assembly (400) arranged inside the capping module (100). The capping module (100) includes a first mold base (110) and a second mold base (120), and the opposing surfaces of the first mold base (110) and the second mold base (120) are provided with flexible injection channels (111). The mold assembly (200) includes a fixed mold (210) and a moving mold (220), and the fixed mold (210) and the moving mold (220) are slidably sleeved on the inner side of the first mold base (110) and the second mold base (120); the opposite surfaces of the fixed mold (210) and the moving mold (220) are provided with a gasket cavity (211), an injection cavity (212), an injection tube (213) and air pressure cavities (214) symmetrically arranged on both sides of the gasket cavity (211); an air bladder (215) communicating with the air pressure cavity (214) is opened on the inner side of the fixed mold (210) and the moving mold (220); The secondary pressure unit (400) is used to increase the air pressure inside the air pressure chamber (214) and the air bag (215) during the relative movement of the first mold base (110) and the second mold base (120) to drive the piston plate (216) to move, thereby realizing secondary pressurization of the gasket cavity (211); The injection tube (213), injection cavity (212) and gasket cavity (211) between the opposite surfaces of the fixed mold (210) and the moving mold (220) are connected in sequence. The injection channel (111) is a tubular structure and one end is fixedly connected to the end of the injection tube (213). The drive assembly (300) includes a fixed base (310) fixed to one side of the first mold base (110), an arc slide (320) embedded in the surface of the first mold base (110), and a column slide head (330) slidably installed inside the arc slide head (320); one side of the column slide head (330) is provided with a pressure head block (331) for passing into the inside of the injection cavity (212), and a connecting rod (332) and a guide rod (333) are rotatably installed on the surface of the pressure head block (331), and one end of the guide rod (333) is rotatably installed on the surface of the arc slide head (320); The arc slide (320) is an arc-shaped slide structure. One end of the guide rod (333) is provided with a rotating shaft located at the center of the arc slide (320). The pressure head block (331) is an arc-shaped bend and is used to pass into the inside of the injection cavity (212) and squeeze the glue inside the injection cavity (212).

2. The double-sided molding silicone pad injection machine according to claim 1, characterized in that, The airbag (215) is arranged perpendicular to both sides of the gasket cavity (211) and located inside the fixed mold (210) and the moving mold (220) respectively. A piston plate (216) is slidably installed on the inner side of the airbag (215), and the piston plate (216) abuts and seals against the inner wall of the airbag (215).

3. The double-sided molding silicone pad injection machine according to claim 1, characterized in that, The inner side of the injection tube (213) is provided with a one-way valve body, which is used to control the injection adhesive to flow unidirectionally from the injection channel (111) into the inner side of the injection chamber (212).

4. The double-sided molding silicone pad injection machine according to claim 1, characterized in that, A connecting groove is provided between the injection cavity (212) and the gasket cavity (211). When the pressure head block (331) is fully inserted into the inner side of the injection cavity (212), it seals against the port of the connecting groove. The outer periphery of the column slide head (330) seals against the port of the injection cavity (212).

5. The double-sided molding silicone pad injection machine according to claim 1, characterized in that, A drive cylinder (311) is fixedly mounted on the surface of the fixed base (310). A slider (312) is slidably mounted on the output end of the drive cylinder (311), and the slider (312) is connected to the column slider (330) for driving the column slider (330) to slide on the surface of the arc slide (320) through the drive cylinder (311).

6. The double-sided molding silicone pad injection machine according to claim 1, characterized in that, The secondary pressure assembly (400) includes a wedge sleeve block (410), a fixed block (420), and a wedge rod (430) fixed to the surface of the fixed block (420). One side of the wedge sleeve block (410) is provided with a wedge pressure port (411) for engaging with the air pressure chamber (214), and the surface of the wedge sleeve block (410) is provided with an oblique sleeve hole adapted to the wedge rod (430). The wedge pressure port (411) enters the inner side of the air pressure chamber (214) to increase the air pressure inside the air pressure chamber (214) and the airbag (215). The fixed block (420) is fixedly installed on one side of the second mold base (120), and the wedge sleeve block (410) is slidably installed on the surface of the first mold base (110).

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