Forming die for cap-shaped rubber film

Abstract

The utility model discloses a forming die for a cap-shaped rubber film, which belongs to the technical field of rubber die pressing dies, and comprises an upper die, a middle die and a lower die which are sequentially arranged from top to bottom, a convex column is upwards arranged at the central position of the upper end surface of the lower die, and a concave hole matched with the convex column is formed in the lower end surface of the upper die; a product cavity is formed between the convex column and the concave hole; the middle die is of an annular structure with a central opening; the cloth clamping component comprises an upper cloth clamping ring and a lower cloth clamping ring, the convex column is sleeved with the upper cloth clamping ring and the lower cloth clamping ring, a clamping and locking device is arranged between the upper cloth clamping ring and the lower cloth clamping ring, and fabric to be clamped is arranged between the upper cloth clamping ring and the lower cloth clamping ring; an exhaust passage system is arranged on the upper die and is communicated with the product cavity; according to the forming die for the cap-shaped rubber film, the magnetic upper cloth clamping ring and the magnetic lower cloth clamping ring are arranged, so that inner-layer fabric is clamped, and the problem that the yield is low due to the fact that the fabric is pleated in the vulcanization process is solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of rubber molding dies, and in particular relates to a molding die for a cap-shaped rubber film. Background Art

[0002] In the modern aviation industry, rubber film components used in the fuel systems of certain aircraft models play a vital role. These film components are not only used as sealing elements in the combined valves of the fuel system, but also have the function of pressure sensing elements. When a pressure difference occurs inside and outside the valve body, the rubber film can respond to this change and produce corresponding displacement, thereby ensuring the normal operation of the fuel system.

[0003] In the traditional production of cap-shaped rubber membranes, products made of fabric and rubber composite materials are usually seen; this structural design can theoretically meet basic sealing and pressure sensing requirements. However, in the actual vulcanization molding process, this high-diameter-ratio cap-shaped rubber membrane faces major challenges, especially in the fixing link of the fabric layer. The traditional method is to manually fix the fabric with a single-layer card fabric ring; this method is not only extremely labor-intensive, but also due to the inaccuracy of manual operation, it is very easy to cause pleating on the fabric. These pleats not only affect the appearance of the product, but more importantly, they will cause inconsistency in the product's sealing performance, which is unacceptable for the sealing performance requirements of the fuel system.

[0004] In addition, the structural design of the traditional mold also has obvious defects. Due to the lack of effective means to evenly fix the fabric layer, the traditional mold cannot ensure the flatness of the fabric layer during the vulcanization molding process. This not only increases the scrap rate in the production process, but also greatly reduces production efficiency.

[0005] Therefore, this structural defect has become the main bottleneck restricting product quality improvement and production efficiency. Summary of the invention

[0006] The utility model provides a forming die for a cap-shaped rubber film, which solves the problems that a fabric layer is inconvenient to fix during the preparation of a cap-shaped rubber film with a high-diameter ratio and the fabric layer is easy to wrinkle during vulcanization.

[0007] In order to achieve the above object, the technical solution of the utility model is as follows:

[0008] A molding die for a cap-shaped rubber film comprises an upper die, a middle die and a lower die arranged in sequence from top to bottom, a convex column is arranged upward at the center of the upper end surface of the lower die, and a concave hole matching the convex column is arranged at the lower end surface of the upper die; a product cavity is formed between the convex column and the concave hole;

[0009] The middle mold is an annular structure with a central opening, the middle mold passes through the central opening and is arranged on the lower mold, the central opening and the upper mold and the lower mold form a card cloth component placement cavity, and the card cloth component is arranged in the card cloth component placement cavity;

[0010] The clamping member comprises an upper clamping ring and a lower clamping ring, both of which are sleeved on the convex column, a locking device is arranged between the upper clamping ring and the lower clamping ring, and a fabric to be clamped is arranged between the upper clamping ring and the lower clamping ring;

[0011] The upper mold is provided with an exhaust duct system, which is communicated with the product cavity.

[0012] Furthermore, the locking device is a magnetic locking device, including a high-temperature magnet arranged on the lower end surface of the upper clamping ring, and the high-temperature magnet is embedded in a magnet mounting groove arranged on the lower end surface of the upper clamping ring.

[0013] Furthermore, the high temperature magnet is arranged in four sections, and the four sections of high temperature magnet are arranged in a ring shape at equal intervals on the lower end surface of the upper card ring.

[0014] Furthermore, the locking device is a mechanical locking device.

[0015] Furthermore, the exhaust duct system includes an exhaust duct, an exhaust valve, an exhaust spring and an exhaust pressure plate; the exhaust duct passes through the upper mold from top to bottom and is connected with the product cavity, an exhaust valve is arranged in the exhaust duct, the exhaust valve is connected to the exhaust pressure plate through the exhaust spring, the exhaust pressure plate is located outside the upper end surface of the upper mold, and the exhaust pressure plate is mounted on the guide rod on the upper end surface of the upper mold through its through hole.

[0016] Furthermore, the exhaust duct is a two-stage variable diameter structure, the inner diameter of the lower exhaust duct is smaller than the inner diameter of the upper exhaust duct, the connection between the upper exhaust duct and the lower exhaust duct constitutes an exhaust valve support, and the exhaust valve is arranged on the exhaust valve support.

[0017] Furthermore, the middle die is connected to the upper die through four groups of annularly evenly distributed fixing bolts.

[0018] Furthermore, four groups of evenly distributed positioning pins in an annular shape are arranged on the upper die, the middle die and the lower die.

[0019] Furthermore, an annular flanged rubber groove is provided on the concave hole.

[0020] Furthermore, the lower edge of the middle hole of the upper clamp ring is an arc transition structure.

[0021] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0022] The hat-shaped rubber film forming mold of the utility model realizes uniform clamping of the inner fabric through its innovative magnetic cap ring design, significantly reduces the problem of fabric pleating during vulcanization, and thus effectively improves the yield rate. In addition, the exhaust device equipped with the mold optimizes the gas emission during the vulcanization process, ensures the thickness and density of the film, further reduces the air entrainment phenomenon, and improves the qualified rate of the product; the utility model molding mold provides an efficient, stable and economical hat-shaped rubber film molding solution, which meets the high standard requirements of modern industry for sealing materials.

[0023] 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

[0024] 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.

[0025] Figure 1 This is a schematic diagram of the overall structure of a molding die for a cap-shaped rubber film according to Embodiment 1 of the utility model;

[0026] Figure 2 This is a schematic structural diagram of a cap-shaped rubber film obtained in Example 1 of the utility model;

[0027] Figure 3 This is a schematic diagram of the positions of the upper and lower clamping fabric rings in Example 1 of the utility model;

[0028] Figure 4 This is a schematic diagram of the installation of a high temperature magnet in Example 1 of the utility model;

[0029] Figure 5 The utility model is a schematic structural diagram of a lower clamping fabric ring.

[0030] In the figure, 1-upper mold, 2-middle mold, 3-lower mold, 4-high temperature magnet, 5-upper clamping fabric ring, 6-lower clamping fabric ring, 7-exhaust valve, 8-spring, 9-pressure plate, 10-guide rod, 11-fixing bolt, 12-locating pin, 13-fabric layer, 14-rubber layer, 15-flanged rubber strip. DETAILED DESCRIPTION

[0031] 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.

[0032] 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.

[0033] 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.

[0034] Embodiment 1:

[0035] See also Figure 1 This embodiment provides a molding die for a cap-shaped rubber film, comprising an upper die 1, a middle die 2 and a lower die 3 arranged in sequence from top to bottom, a convex column is arranged upward at the center of the upper end surface of the lower die 3, and a concave hole matching the convex column is arranged at the lower end surface of the upper die; a product cavity is formed between the convex column and the concave hole;

[0036] The middle mold 2 is an annular structure with a central opening. The middle mold 2 passes through the central opening through the convex column and is arranged on the upper end surface of the lower mold 3. The central opening and the upper mold 1 and the lower mold 3 form a closed card cloth component placement cavity;

[0037] See also Figure 3-Figure 5A cloth component is arranged in the cloth component placement cavity, and the cloth component includes an upper cloth ring 5 and a lower cloth ring 6, both of which are sleeved on the convex column, and the lower cloth ring is arranged on the upper end surface of the lower mold 3; a locking device is arranged between the upper cloth ring and the lower cloth ring. In this embodiment, the locking device is a magnetic locking device, including four sections of high-temperature magnets 4 arranged on the lower end surface of the upper cloth ring, and the four sections of high-temperature magnets 4 are equidistantly annularly embedded in the magnet mounting groove arranged on the lower end surface of the upper cloth ring; the fabric to be clamped is clamped between the upper cloth ring 5 and the lower cloth ring 6, and is firmly clamped by the magnetic attraction of the four sections of high-temperature magnets 4 and the lower cloth ring to prevent the fabric to be clamped from wrinkling.

[0038] In order to ensure the uniform density of the hat-shaped rubber film during the vulcanization process and reduce the occurrence of air curling in the thickness direction of the hat-shaped rubber film, the molding mold in this embodiment is provided with an exhaust duct system, which includes an exhaust duct, an exhaust valve 7, an exhaust spring 8 and an exhaust pressure plate 9; the exhaust duct runs through the upper mold from top to bottom and is connected with the product cavity. In this embodiment, the exhaust duct is a two-stage variable diameter structure, the inner diameter of the lower exhaust duct is smaller than the inner diameter of the upper exhaust duct, and the connection between the upper exhaust duct and the lower exhaust duct constitutes an exhaust valve support platform, the exhaust valve 7 is arranged on the exhaust valve support platform, the exhaust valve 7 is a rubber valve structure, and the upper end of the exhaust valve 7 is connected to the exhaust pressure plate 9 through the exhaust spring 8, and the exhaust pressure plate 9 A through hole is provided on one side of the exhaust pressure plate in the plate groove outside the upper end surface of the upper mold 1, and the exhaust pressure plate 9 is sleeved on the guide rod 10 in the plate groove at the upper end of the upper mold 1 through its through hole, and the exhaust pressure plate 9 can slide on the guide rod 10; before the internal pressure of the molding mold reaches the valve opening threshold, the exhaust pressure plate 9 presses the exhaust valve 7 on the exhaust valve support platform through its own weight and the exhaust spring 8, and the product cavity is closed and sealed at this time; during the high-temperature vulcanization process, the high-pressure gas generated inside the molding mold breaks through the pressure threshold provided by the exhaust pressure plate 9, and the high-pressure gas lifts the exhaust valve 7, and the gas is discharged along the exhaust duct, which avoids the problems of air entrainment, stratification and bubbling during the preparation of the cap-shaped rubber film.

[0039] In this embodiment, the middle mold 2 itself is an annular structure. In order to enhance the installation convenience and stability of the middle mold 2 and the upper mold 1, the middle mold 2 is detachably connected to the upper mold 1 through four groups of annularly evenly distributed fixing bolts 11; after the middle mold 2 and the upper mold 1 are fixed as one, the upper mold 1, the middle mold 2, and the lower mold 3 can be quickly positioned and installed by passing through four groups of annularly evenly distributed positioning pins 12 on the upper mold 1, the middle mold 2, and the lower mold 3.

[0040] See also Figure 2The hat-shaped rubber film produced by the molding mold of the hat-shaped rubber film in this embodiment is an overall hat-shaped structure with a height-to-diameter ratio, including an inner fabric layer 13 and an outer rubber layer 14. An annular flanged rubber strip 15 structure is arranged at the lower edge of the hat-shaped rubber film, which is used for the installation and fixation of the hat-shaped rubber film and the sealed component; therefore, in this embodiment, an annular flanged rubber groove is correspondingly arranged in the concave hole of the upper mold 1, which is used for the vulcanization molding of the flanged rubber strip 15.

[0041] During the design process of the upper and lower card cloth rings 5 ​​and 6, the inventor took into consideration the protection of the fabric to be sandwiched and the prevention of cutting of the fabric to be sandwiched during the clamping process, and set the lower edge of the middle hole of the upper card cloth ring 5 as an arc transition structure.

[0042] The working process of the molding die of the cap-shaped rubber film of this embodiment is as follows:

[0043] S1. Fix the upper die and the middle die together with four sets of fixing bolts;

[0044] S2, firstly, the lower card cloth ring is set on the lower end of the convex column of the lower mold, and then the cut fabric is covered on the convex column of the lower mold, and finally the upper card cloth ring is set on the convex column of the lower mold, and the upper card cloth ring and the lower card cloth ring are connected by high-temperature magnets to fix the fabric to be clamped, and the fabric to be clamped is flatly covered on the convex column of the lower mold, and the upper card cloth ring and the lower card cloth ring are located in the middle of the whole fabric to be clamped;

[0045] S3, placing the prepared rubber semi-finished product in the flanged rubber groove of the upper mold, and then wrapping the prepared rubber sheet semi-finished product around the outer side of the fabric outside the convex column;

[0046] S4. Clamp the upper mold, middle mold and lower mold that are connected as one, and quickly position them through four sets of ring-shaped evenly distributed positioning pins;

[0047] S5. Send the mold-clamping die into the vulcanizer for high-temperature vulcanization. During the vulcanization process, the gas in the product cavity is exhausted through the exhaust duct system;

[0048] S6. After the vulcanization is completed, the temperature is lowered, the mold is opened, and the hat-shaped rubber film product with a high-diameter ratio is taken out.

[0049] The cap-shaped rubber film forming mold in this embodiment can realize the manufacture of high-quality sealing products; the structure of the mold includes an upper mold, a middle mold and a lower mold, wherein the cooperation of the convex column and the concave hole forms a precise product cavity; the application of the magnetic locking device, especially the uniform distribution of the high-temperature magnet, ensures the flatness of the fabric layer during the vulcanization process, thereby improving the molding quality of the product. The secondary variable diameter structure of the exhaust duct system and the design of the exhaust valve effectively solve the problem of air entrainment during the vulcanization process and ensure the uniform density of the product. In addition, the rapid positioning and installation function of the mold in this embodiment improves production efficiency, and the arc transition structure of the upper card cloth ring enhances the protection of the fabric.

[0050] Embodiment 2:

[0051] In this embodiment, the locking device can also be designed as a mechanical locking device, including a bayonet and a staple, wherein:

[0052] Bayonet: The bayonet is designed as an annular groove located on the lower end surface of the upper clamp ring. The inner wall of the bayonet has an inclined guide surface for guiding the staple to be smoothly inserted and locked.

[0053] Staples: The staples are cylindrical in structure. Multiple groups of staples are located on the upper end surface of the lower clamp ring. One end is designed as a conical tip to facilitate insertion into the bayonet.

[0054] During the staple locking process, the fabric layer is clamped between the upper and lower staple rings, and the cylindrical part between the conical tip of the staple and the operating head presses the fabric to ensure that it is flat and will not slip.

[0055] Except for the change of the locking device, the other parts of Example 2, including the composition of the mold, the design of the exhaust system, and the operation steps during the vulcanization process, are the same as those of Example 1. Such a design maintains the consistency and reliability of the molding mold, while providing an alternative fixing mechanism to adapt to different production needs and conditions.

[0056] 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 hat-shaped rubber film, comprising an upper die, a middle die and a lower die arranged in sequence from top to bottom, characterized in that: A convex column is provided upwardly at the central position of the upper end surface of the lower mold, and a concave hole matching the convex column is provided on the lower end surface of the upper mold; a product cavity is formed between the convex column and the concave hole; The middle mold is an annular structure with a central opening, the middle mold passes through the central opening and is arranged on the lower mold, the central opening and the upper mold and the lower mold form a card cloth component placement cavity, and the card cloth component is arranged in the card cloth component placement cavity; The clamping member comprises an upper clamping ring and a lower clamping ring, both of which are sleeved on the convex column, a locking device is arranged between the upper clamping ring and the lower clamping ring, and a fabric to be clamped is arranged between the upper clamping ring and the lower clamping ring; The upper mold is provided with an exhaust duct system, which is communicated with the product cavity.

2. The molding die for the hat-shaped rubber film according to claim 1, characterized in that: The locking device is a magnetic locking device, which includes a high-temperature magnet arranged on the lower end surface of the upper clamp ring, and the high-temperature magnet is embedded in a magnet installation groove arranged on the lower end surface of the upper clamp ring.

3. The molding die for the hat-shaped rubber film according to claim 2, characterized in that: The high temperature magnet is arranged in four sections, and the four sections of high temperature magnet are arranged in a ring shape at equal intervals on the lower end surface of the upper card cloth ring.

4. The molding die for the hat-shaped rubber film according to claim 1, characterized in that: The locking device is a mechanical locking device.

5. The molding die for the hat-shaped rubber film according to claim 1, characterized in that: The exhaust duct system includes an exhaust duct, an exhaust valve, an exhaust spring and an exhaust pressure plate; the exhaust duct runs through the upper mold from top to bottom and is connected with the product cavity, an exhaust valve is arranged in the exhaust duct, the exhaust valve is connected to the exhaust pressure plate through the exhaust spring, the exhaust pressure plate is located outside the upper end surface of the upper mold, and the exhaust pressure plate is mounted on the guide rod on the upper end surface of the upper mold through its through hole.

6. The molding die for the hat-shaped rubber film according to claim 5, characterized in that: The exhaust duct is a two-stage variable diameter structure, the inner diameter of the lower exhaust duct is smaller than the inner diameter of the upper exhaust duct, the connection between the upper exhaust duct and the lower exhaust duct forms an exhaust valve support, and the exhaust valve is arranged on the exhaust valve support.

7. The molding die for the hat-shaped rubber film according to claim 1, characterized in that: The middle die is connected to the upper die through four groups of annularly evenly distributed fixing bolts.

8. The molding die for the hat-shaped rubber film according to claim 1, characterized in that: The upper die, the middle die and the lower die are provided with four groups of ring-shaped uniformly distributed positioning pins.

9. The molding die for the hat-shaped rubber film according to claim 1, characterized in that: The concave hole is provided with an annular flanged rubber groove.

10. The molding die for the hat-shaped rubber film according to claim 1, characterized in that: The lower edge of the middle hole of the upper cab ring is an arc transition structure.

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