Forming die for large fabric reinforced rubber compensation film

Abstract

The utility model relates to a forming die for a large fabric reinforced rubber compensation film. The forming die comprises an upper die and a lower die, a convex body is arranged in the center of the upper end face of the lower die, a concave cavity matched with the convex body is formed in the lower end face of the upper die, and a product cavity is formed. An aluminum alloy insert is embedded in the lower die, the insert is detachably connected through a bolt, the lower die is provided with multiple stages of annular step structures, the second-stage step structure is provided with a pressing ring, the first-stage step structure is provided with a baffle ring, and the baffle ring can press the pressing ring inwards and downwards; the upper die is provided with a deflation channel which is provided with a deflation valve mechanism. The guide device is composed of a positioning column and a positioning hole, and the positioning column is inserted into the positioning hole to ensure accurate alignment of the upper die and the lower die; the mould disclosed by the utility model is reasonable in design, can effectively solve the problems of fabric wrinkling, air entrapment and mould sticking in the traditional mould, and improves the yield and the product quality.

Description

Technical Field

[0001] The utility model belongs to the technical field of rubber molding, and in particular relates to a molding die for a large-scale fabric-reinforced rubber compensation membrane. Background Art

[0002] Compensation membrane is a key engineering product, widely used in various structures to compensate for deformation and displacement, ensuring the stability and safety of the structure. Compensation membrane materials usually need to have high ductility and elasticity, be able to deform when subjected to external forces, and return to their original shape after the external forces are removed, to meet the needs of multiple uses; rubber materials are often selected as the main material for compensation membranes due to their excellent elasticity and ductility. However, in order to improve its high pressure resistance and service life, fiber materials are usually added to rubber for reinforcement.

[0003] Traditional compensation film mold design usually includes a concave mold and a convex mold, and the molding process is adhesive coating molding, which is relatively mature; however, with the emergence of new compensation film structures, especially compensation films with larger size, higher height and smaller slope, the traditional process faces a series of problems.

[0004] First, the fabric on the side of the large compensation film is prone to wrinkles during the molding process. In addition, in order to enhance the sealing between the compensation film and the metal during operation, multiple sealing structures are usually designed at the bottom, but air entrainment problems are prone to occur during the molding process.

[0005] The sealing ring structure of the compensation film is designed as a curved surface, which makes it difficult to discharge gas during the molding process and easily forms air curling at the sealing ring. At the same time, due to the large size of the compensation film, good guidance is required during mold operation to avoid damaging the mold, which also increases the difficulty of molding and reduces the yield rate.

[0006] In order to enhance the bonding strength between rubber and fabric, resin is usually added to rubber and fabric for viscosity-enhancing treatment, but this can easily lead to mold sticking problems during the molding process. At present, traditional compensation film molds can no longer meet the molding needs of new compensation films.

[0007] A new mold is urgently needed to solve the problems existing in the prior art, such as fabric wrinkles, air curling, mold sticking and low yield. Summary of the invention

[0008] The utility model provides a large-scale fabric-reinforced rubber compensation film forming die, which solves the problems of the existing rubber compensation film forming die easily causing fabric wrinkles, air curling, mold sticking and low yield during product forming.

[0009] In order to achieve the above object, the technical solution of the utility model is as follows:

[0010] A forming die for a large fabric-reinforced rubber compensation membrane, wherein the compensation membrane is a flat-bottomed bowl-shaped structure as a whole, including a compensation membrane bottom, a compensation membrane side, and a flanged ring arranged at the lower part of the compensation membrane side and outward; a flanged sealing ring is arranged on the flanged ring, and a plurality of bottom sealing rings are arranged at the bottom of the compensation membrane and expand along the center; a mounting hole is opened at the bottom of the compensation membrane, and the compensation membrane bottom and the compensation membrane side include an outer fabric layer and an inner rubber layer;

[0011] The forming mold of the compensation film comprises an upper mold and a lower mold, a convex body is provided upward at the central position of the upper end surface of the lower mold, and a concave cavity matching the convex body is provided at the lower end surface of the upper mold; a product cavity is formed between the convex body and the concave cavity, and a flanging sealing ring forming cavity is provided on the end surface of the upper mold;

[0012] An aluminum alloy insert is embedded in the lower mold, and the aluminum alloy insert is located at the convex body position;

[0013] The upper mold is provided with an air release channel outwardly, the air release channel is communicated with the product cavity, and an air release valve mechanism is provided on the air release channel;

[0014] A multi-stage circumferential stepped structure is arranged on the lower mold, a pressure ring is arranged on the second-stage stepped structure, and a retaining ring is arranged on the first-stage stepped structure, wherein the retaining ring is located outside the pressure ring and can press the pressure ring inwardly and downwardly to clamp the fabric at the contact surface between the pressure ring and the lower mold;

[0015] The retaining ring is matched with the upper die, and a guiding device is arranged between the retaining ring and the upper die.

[0016] Furthermore, the guiding device includes several groups of positioning columns and corresponding positioning holes. The positioning columns are inserted into the retaining ring through blind holes on the upper end surface of the retaining ring. The positioning holes are through holes opened in the upper mold. The upper mold is inserted into the positioning columns through the positioning holes to accurately align with the lower mold.

[0017] Furthermore, the upper part of the positioning column is a cone structure, and after the upper mold is inserted into the positioning column through the positioning hole and accurately aligned with the lower mold, the upper end of the positioning column extends out of the upper end surface of the upper mold.

[0018] Furthermore, three groups of the positioning posts and the positioning holes are provided correspondingly, and the three groups of positioning posts are arranged in a ring shape at equal intervals on the upper end surface of the retaining ring.

[0019] Furthermore, a lock hole is provided at the upper end of the air release channel; the air release valve mechanism includes a spring, an air release valve column and a nut; the air release valve column includes a platform bottom, a column and a thread provided on the upper part of the column, a spring is sleeved on the column, the spring is located between the upper end surface of the platform bottom and the lower end surface of the lock hole, the upper end of the column extends out of the lock hole and is threadedly connected to the nut, and the platform bottom and the air release channel are matched with a small gap.

[0020] Furthermore, a three-level circumferential step structure is provided on the lower mold, and a plurality of circumferential glue flow grooves are provided on the third-level step structure.

[0021] Furthermore, both the upper die and the retaining ring are provided with die opening grooves.

[0022] Furthermore, the aluminum alloy insert includes an insert body and an installation outer edge arranged at the lower part of the insert body, the installation outer edge is provided with a plurality of threaded through holes, and the aluminum alloy insert is detachably connected to the lower mold by bolts.

[0023] Furthermore, a plurality of circumferential glue flow grooves are arranged on the upper mold, and the glue flow grooves on the upper mold are adjacent to the glue flow grooves on the lower mold.

[0024] Furthermore, the aluminum alloy insert is detachably connected to the lower mold via three groups of bolts arranged in an annular shape at equal intervals.

[0025] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0026] The utility model designs a multi-stage circumferential ladder structure on the lower mold and utilizes the cooperation of a pressure ring and a retaining ring to effectively prevent the problem of wrinkles in the fabric during the molding process; an air release channel and an air release valve mechanism are arranged on the upper mold to ensure that the gas in the mold cavity can be discharged smoothly and avoid the air roll phenomenon; the design of the guide device improves the guidance and molding accuracy of the mold and prevents the mold from being dislocated and damaged; the large specific heat capacity and high thermal conductivity of the aluminum alloy insert of the utility model enable the aluminum alloy to quickly transfer heat during the heating and cooling process, ensuring that the temperature inside the mold is evenly distributed, thereby shortening the preheating and vulcanization time and improving the accuracy of temperature control.

[0027] Of course, implementing the various technical solutions of the present invention does not necessarily require achieving all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, drawings of other embodiments can be obtained based on these drawings without paying creative work.

[0029] Figure 1 This is a schematic diagram of the overall structure of a large fabric-reinforced rubber compensation membrane according to an embodiment of the utility model;

[0030] Figure 2 This is a schematic diagram of the structure of the mold of the utility model embodiment;

[0031] Figure 3This is a schematic diagram of the trimming process after pre-forming of the semi-finished product of the embodiment of the utility model;

[0032] Figure 4 This is a schematic diagram of the pre-molding process of the bottom sealing ring in an embodiment of the utility model;

[0033] Figure 5 This is a schematic diagram of the mold vulcanization process of an embodiment of the utility model.

[0034] In the figure,

[0035] 1-upper die, 101-concave cavity, 102-positioning hole, 103-flanged sealing ring molding cavity; 2-lower die, 201-convex body, 202-aluminum alloy insert, 203-glue flow groove; 3-air release valve mechanism, 301-spring, 302-air release valve column, 303-nut; 4-pressing ring; 5-blocking ring; 6-positioning column; 7-mold opening groove; 8-molding tooling; 901-rubber body, 902-fabric layer, 903-flanged sealing ring, 904-bottom sealing ring, 905-mounting hole. DETAILED DESCRIPTION

[0036] In order to facilitate the understanding of the present invention, the present invention will be described more comprehensively with reference to the relevant drawings. The drawings provide preferred embodiments of the present invention. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thoroughly and comprehensively understood.

[0037] In the description of this patent, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing this patent and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this patent.

[0038] In the description of this patent, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "set" should be understood in a broad sense, for example, it can be fixedly connected, set, or detachably connected, set, or connected and set in one piece. For ordinary technicians in this field, the specific meanings of the above terms in this patent can be understood according to specific circumstances. The following is a detailed description of the utility model in conjunction with the accompanying drawings and embodiments.

[0039] Example:

[0040] See also Figure 2-Figure 5The present embodiment provides a molding die for a large fabric-reinforced rubber compensation membrane; the mold comprises an upper mold 1 and a lower mold 2; a convex body 201 is provided upwardly at the central position of the upper end surface of the lower mold 2, and a concave cavity 101 matching the convex body 201 is provided on the lower end surface of the upper mold 1, and a product cavity is formed between the convex body 201 and the concave cavity 101; a flanged sealing ring molding cavity 103 with an annular structure is provided on the lower end surface of the upper mold 1, and the flanged sealing ring molding cavity 103 is located on the outer circle of the concave cavity 101.

[0041] The upper mold 1 is provided with an air release channel outwardly, the air release channel is connected with the product cavity, and an air release valve mechanism 3 is arranged on the air release channel; a lock hole is arranged at the upper end of the air release channel, the lock hole aperture is smaller than the inner diameter of the air release channel, the lock hole is used to penetrate the column, the air release valve mechanism 3 includes a spring 301, an air release valve column 302 and a nut 303; the air release valve column 302 includes a platform bottom at the lower end, a column connected to the platform bottom and a thread arranged on the upper part of the column, the spring 301 is sleeved on the column of the air release valve column 302, specifically, the spring 301 is located between the upper end surface of the platform bottom and the lower end surface of the lock hole, The upper end of the air release valve column 302 extends out of the lock hole and is threadedly connected to the nut 303, that is, the nut 303 hangs the air release valve column 302, and the bottom of the air release valve column 302 cooperates with the small gap of the air release channel to exhaust air. The bottom of the air release valve column 302 is flush with the upper end surface of the product cavity; during the molding process, the rubber material expands due to heat and flows to push the air release valve column 302 to move upward, forming a space for accommodating residual rubber and exhausting air. At this time, the spring 301 is compressed and stores energy. As the Mooney viscosity of the rubber material decreases, the spring 301 uses its own stored energy to push the air release valve column to gradually return to its original position.

[0042] A multi-stage circumferential stepped structure is provided on the lower mold 2, a pressure ring 4 is provided on the second-stage stepped structure, and a retaining ring 5 is provided on the first-stage stepped structure; the retaining ring 5 is located outside the pressure ring 4, and can press the pressure ring 4 inward and downward, and the contact surface between the pressure ring 4 and the lower mold 2 is used to clamp the fabric; the retaining ring 5 is fitted with the upper mold 1, and a guide device is provided between the retaining ring 5 and the upper mold 1 for mold closing guidance.

[0043] In this embodiment, the guiding device includes a plurality of groups of positioning posts 6 and corresponding positioning holes 102. The positioning posts 6 are inserted on the retaining ring 5 through blind holes on the upper end surface of the retaining ring 5. The positioning holes 102 are through holes provided in the upper mold 1. The upper mold 1 is inserted into the positioning holes 102 through the positioning posts 6 to achieve precise alignment with the lower mold 2. To facilitate insertion, the upper portion of the positioning posts 6 is a conical structure. After the upper mold 1 is inserted into the positioning holes 102 through the positioning posts 6 and is precisely aligned with the lower mold 2, the upper end of the positioning posts 6 extends out of the upper end surface of the upper mold 1. To facilitate mold closing, the positioning posts 6 are pulled out of the mold system.

[0044] In this embodiment, a three-level circumferential step structure is provided on the lower mold 2, and a plurality of circumferential glue flow grooves 203 are provided on the third-level step structure to facilitate the discharge of excess glue during vulcanization; mold opening grooves 7 are provided on the upper mold 1 and the retaining ring 5 to facilitate the opening and closing operations of the mold system.

[0045] In this embodiment, an aluminum alloy insert 202 is embedded in the convex body 201, and the aluminum alloy insert 202 is detachably connected to the lower mold 2 by bolts. Aluminum alloy has significant advantages, which greatly improves the performance and production efficiency of the mold.

[0046] First, the density of aluminum alloy is low (the density is usually 2.7g / cm 3 The density is about 7.8g / cm 3 ). Therefore, the use of aluminum alloy inserts can significantly reduce the overall weight of the mold. This lightweight design not only facilitates the handling and operation of the mold, but also reduces the mechanical burden during mold closing and opening, and improves the convenience and safety of operation.

[0047] Secondly, the specific heat capacity of aluminum alloy is relatively large (about 900 J / (kg·K)), which is much higher than that of steel (about 500 J / (kg·K)). This means that aluminum alloy can absorb and release more heat during the heating and cooling process, which is conducive to the uniform distribution of temperature inside the mold. Especially during the vulcanization process, aluminum alloy inserts can quickly transfer heat, so that the temperature inside the mold quickly reaches the set value, thereby shortening the preheating time and vulcanization time.

[0048] In addition, the thermal conductivity of aluminum alloy is relatively high (usually greater than 100W / (m·K)), which is significantly higher than that of steel (about 50W / (m·K)). This allows aluminum alloy inserts to have faster heat transfer during heating and cooling; due to the rapid heat transfer, the temperature control of the mold during the molding process is more precise, which can effectively avoid local overheating or overcooling problems and ensure the molding quality and consistency of the product.

[0049] The working process of the molding die of the large-scale fabric-reinforced rubber compensation membrane of this embodiment is as follows:

[0050] Step 1: Fabric selection and tackification treatment:

[0051] A nylon warp knitted fabric 8 with a thickness of 0.25 mm was selected, and 589 resin was used to increase the viscosity of the fabric at a ratio of 1:15, and the fabric after the increase in viscosity was dried in the shade for later use. The purpose of this step is to improve the bonding strength between the fabric and the rubber layer to ensure the durability and stability of the final product.

[0052] Step 2: Semi-finished product preparation:

[0053] The bottom rubber compound and the side rubber compound are prepared by calendering and extrusion respectively; the bottom rubber compound is calendered with a film having a thickness of 1.5 mm, and the side rubber compound is calendered with a film having a thickness of 1.2 mm; selecting the rubber compound of appropriate thickness can ensure that the compensation film after molding has good mechanical properties and elasticity.

[0054] Step 3: Cutting of semi-finished products:

[0055] According to the shape of the compensation film, the bottom rubber material is cut into circular test pieces, and the side rubber material is cut into rectangular test pieces; through precise cutting, it is ensured that the rubber material can completely cover the working area of ​​the mold to avoid material shortage or excess during the molding process.

[0056] Step 4: Pre-forming of semi-finished products:

[0057] Spray a curing type mold release agent in the concave cavity 101 of the upper mold 1, and place the bottom semi-finished product and the side semi-finished product on the convex body 201 of the lower mold 2; the upper mold 1 and the lower mold 3 are combined to perform low-temperature vulcanization pre-forming, and the pre-forming conditions are 50°C, 13MPa, and 2 minutes; after low-temperature vulcanization pre-forming, the mold is opened, and the pre-formed semi-finished product on the convex body of the lower mold is trimmed, see Figure 3 The purpose of low-temperature vulcanization pre-forming is to initially fix the shape of the rubber material to facilitate subsequent molding operations.

[0058] Step 5: Clean the bleed valve mechanism:

[0059] Loosen the nut 303 of the bleed valve mechanism 3 on the upper mold 1, disassemble the bleed valve column 302, clean the bleed channel, and then reset the bleed valve mechanism so that the bleed valve column is flush with the lower edge of the bleed channel; cleaning the bleed valve mechanism can ensure that the exhaust channel is unobstructed and avoid poor exhaust during the vulcanization molding process.

[0060] Step 6: Bottom sealing ring pre-forming:

[0061] The sealing ring rubber material is placed in the flanged sealing ring forming cavity 103 of the upper mold 1, and then the upper mold is placed on the molding tool 8, see Figure 4 , and sent to the vulcanizer for low-temperature vulcanization pre-forming; the conditions for low-temperature vulcanization pre-forming are temperature 50°C, pressure 13MPa, and time 2 minutes; after low-temperature vulcanization pre-forming, open the mold and take out the bottom sealing ring semi-finished product.

[0062] Step 7: Fabric Wrapping:

[0063] The pre-formed rubber semi-finished product is wrapped on the convex body 201, and then the fabric is wrapped around the rubber semi-finished product; the fabric is pressed and straightened by the pressing ring 4, and then the pressing ring is knocked circumferentially with a copper rod, and finally the retaining ring 5 is installed to lock the pressing ring to prevent the fabric from wrinkling; through the cooperation of the pressing ring and the retaining ring, it can be ensured that the fabric remains flat during the molding process to avoid wrinkles.

[0064] Step 8: Placement of semi-finished sealing ring:

[0065] The bottom sealing ring semi-finished product is sleeved on the convex body 201 so that the bottom sealing ring semi-finished product is located at the position of the flange sealing ring forming cavity 103; this step ensures that the sealing ring is well combined with the compensation membrane body.

[0066] Step 9: Anti-sticking treatment of product cavity:

[0067] Atomized silicone oil is sprayed on the surface of the wiping cloth to wipe the inside of the cavity 101; the anti-mold treatment can prevent the rubber semi-finished product from adhering to the mold surface during the vulcanization process, thereby improving the subsequent demoulding efficiency.

[0068] Step 10: Mold vulcanization:

[0069] See also Figure 5 The upper mold 1 is guided downward to the mold by the positioning pin 6 on the retaining ring 5. After the mold is closed, the positioning pin 6 is removed, and then the entire mold is sent to the vulcanizer for gradual temperature increase and vulcanization; the mold closing and vulcanization conditions are temperature 150°C, pressure 13MPa, and time 90 minutes; through mold closing and vulcanization, it is ensured that the various parts of the compensation film are tightly combined to form a whole.

[0070] Step 11: Punching holes:

[0071] After vulcanization and molding, the product is cooled and demoulded, and then a mounting hole is made at the bottom of the product through a punching process; the punching process ensures that the compensation film can be easily installed on the corresponding equipment.

[0072] Through the above steps, the large-scale fabric-reinforced rubber compensation membrane prepared has excellent sealing performance and durability, and solves the problems of fabric wrinkles, air curling, mold sticking and low yield in the prior art.

[0073] The large fabric-reinforced rubber compensation membrane structure prepared in this embodiment is as follows: Figure 1 As shown, it has the following structural features:

[0074] Flat-bottomed bowl-shaped structure: The compensation film is flat-bottomed bowl-shaped as a whole, including the bottom of the compensation film, the side of the compensation film, and a flange ring arranged at the lower part of the side of the compensation film and extending outward.

[0075] Flanged sealing ring 903: A flanging sealing ring 903 is provided on the flanging ring to increase the sealing performance of the product. The flanging sealing ring 903 is located outside the fabric layer 902.

[0076] Bottom sealing ring 904: Several circles of bottom sealing rings 904 expanding along the center are arranged at the bottom of the compensation membrane to ensure the sealing effect after the moving parts are installed in the installation hole.

[0077] Mounting hole 905: A mounting hole 905 is provided at the bottom of the compensation film to facilitate the installation and fixation of moving parts.

[0078] Material structure: The bottom and side of the compensation membrane include an external fabric layer 902 and an internal rubber layer 901. The fabric layer 902 is made of 0.25 mm thick nylon warp knitted fabric to enhance the strength and durability of the product.

[0079] The mounting hole of the large fabric-reinforced rubber compensation membrane prepared in this embodiment is connected to the metal connector of the moving part to play a fixing role. Under the push and pull of the metal connector, the side of the compensation membrane of the large fabric-reinforced rubber compensation membrane repeatedly expands and contracts to realize its function.

[0080] The above specific examples are used to illustrate the present invention, which are only used to help understand the present invention and are not intended to limit the present invention. For those skilled in the art of the present invention, some simple deductions, deformations or substitutions can be made based on the idea of ​​the present invention.

Claims

1. A molding die for a large fabric-reinforced rubber compensation membrane, characterized in that: The compensation membrane is a flat-bottomed bowl-shaped structure as a whole, including a compensation membrane bottom, a compensation membrane side, and a flanged ring arranged at the lower part of the compensation membrane side and outward; a flanged sealing ring is arranged on the flanged ring, and a plurality of bottom sealing rings are arranged at the bottom of the compensation membrane and expand along the center; a mounting hole is opened at the bottom of the compensation membrane, and the compensation membrane bottom and the compensation membrane side include an outer fabric layer and an inner rubber layer; The forming mold of the compensation film comprises an upper mold and a lower mold, a convex body is provided upward at the central position of the upper end surface of the lower mold, and a concave cavity matching the convex body is provided at the lower end surface of the upper mold; a product cavity is formed between the convex body and the concave cavity, and a flanging sealing ring forming cavity is provided on the end surface of the upper mold; An aluminum alloy insert is embedded in the lower mold, and the aluminum alloy insert is located at the convex position; the aluminum alloy insert includes an insert body and an installation outer edge arranged at the lower part of the insert body, and the installation outer edge is provided with a plurality of threaded through holes, and the aluminum alloy insert is detachably connected to the lower mold by bolts; The upper mold is provided with an air release channel outwardly, the air release channel is communicated with the product cavity, and an air release valve mechanism is provided on the air release channel; A multi-stage circumferential stepped structure is arranged on the lower mold, a pressure ring is arranged on the second-stage stepped structure, and a retaining ring is arranged on the first-stage stepped structure, wherein the retaining ring is located outside the pressure ring and can press the pressure ring inwardly and downwardly to clamp the fabric at the contact surface between the pressure ring and the lower mold; The retaining ring is matched with the upper die, and a guiding device is arranged between the retaining ring and the upper die.

2. The forming die of the large-scale fabric-reinforced rubber compensation membrane according to claim 1 is characterized in that: The guiding device includes several groups of positioning columns and corresponding positioning holes. The positioning columns are inserted into the retaining ring through blind holes on the upper end surface of the retaining ring. The positioning holes are through holes opened in the upper mold. The upper mold is inserted into the positioning columns through the positioning holes to accurately align with the lower mold.

3. The forming mold of the large-scale fabric-reinforced rubber compensation membrane according to claim 2 is characterized in that: The upper part of the positioning column is a cone structure. After the upper die is inserted into the positioning column through the positioning hole and accurately aligned with the lower die, the upper end of the positioning column extends out of the upper end surface of the upper die.

4. The forming die of the large-scale fabric-reinforced rubber compensation membrane according to claim 2 is characterized in that: The positioning posts and the positioning holes are provided in three groups correspondingly, and the three groups of positioning posts are arranged in a ring shape at equal intervals on the upper end surface of the retaining ring.

5. The forming die of the large-scale fabric-reinforced rubber compensation membrane according to claim 1 is characterized in that: A lock hole is arranged at the upper end of the air release channel; the air release valve mechanism includes a spring, an air release valve column and a nut; the air release valve column includes a platform bottom, a column and a thread arranged on the upper part of the column, a spring is sleeved on the column, the spring is located between the upper end surface of the platform bottom and the lower end surface of the lock hole, the upper end of the column extends out of the lock hole and is threadedly connected to the nut, and the platform bottom and the air release channel are matched with a small gap.

6. The forming die of the large-scale fabric-reinforced rubber compensation membrane according to claim 1, characterized in that: The lower mold is provided with a three-level circumferential step structure, and the third-level step structure is provided with a plurality of circumferential glue flow grooves.

7. The forming die of the large-scale fabric-reinforced rubber compensation membrane according to claim 1, characterized in that: The upper die and the retaining ring are both provided with die opening grooves.

8. The forming die for the large-scale fabric-reinforced rubber compensation membrane according to claim 6, characterized in that: A plurality of circumferential glue flow grooves are arranged on the upper mold, and the glue flow grooves on the upper mold are adjacent to the glue flow grooves on the lower mold.

9. The forming die of the large-scale fabric-reinforced rubber compensation membrane according to claim 1, characterized in that: The aluminum alloy insert is detachably connected to the lower mold through three groups of bolts arranged in an annular shape at equal intervals.

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