A forming die for an air spring inner bag

Abstract

The utility model provides a kind of for air spring inner bag's forming die, including upper die assembly, middle die assembly and lower die assembly, middle die assembly is located between upper die assembly and lower die assembly, the inner wall of upper die assembly is provided with upper inner die, the inner wall of middle die assembly is provided with lower inner die, upper inner die and lower inner die combination form mould cavity, mould core is provided in mould cavity, and the inner wall between mould cavity and mould core forms the cavity of vulcanization air spring inner bag;Injection channel is arranged in upper die assembly, one end of injection channel is connected with cavity, and the other end of injection channel is connected with the outside of forming die.Air spring inner bag in vulcanization process, mould core supports air spring inner bag, since mould core cannot be deformed, as long as the distance between the inner wall of mould cavity and mould core is certain, then the thickness of air spring inner bag after forming is also certain, so that air spring inner bag is uniformly expanded when making air spring skin bag.

Description

Technical Field

[0001] This utility model relates to the field of air spring inner bladder technology, and in particular to a molding die for an air spring inner bladder. Background Technology

[0002] As an important shock absorption device for vehicles, air springs utilize the nonlinear stiffness characteristics of air springs to form air spring shock absorbers, which can effectively optimize both comfort and handling. They are currently widely used in passenger cars and commercial vehicles.

[0003] During the air spring bladder molding process, air is inflated into the inner bladder of the air spring. The expansion of the inner bladder causes the outer bladder of the air spring to expand and take shape, thereby matching the shape of the inner wall of the air spring bladder with that of the outer wall of the inner bladder.

[0004] In the existing technology, the air spring inner bladder is also formed by inflation. However, the thickness of the air spring inner bladder may be uneven due to uneven stress in different parts after inflation. The degree of expansion of the air spring inner bladder with uneven thickness will also be different, which will affect the quality of the formed air spring bladder. Summary of the Invention

[0005] This invention provides a molding die for an air spring inner bladder, which solves the technical problem that uneven thickness of the molded air spring inner bladder caused by inflation affects the lifespan of the air spring bladder.

[0006] This utility model provides a molding die for an air spring inner bladder, comprising an upper mold assembly, a middle mold assembly, and a lower mold assembly. The middle mold assembly is located between the upper mold assembly and the lower mold assembly. An upper inner mold is provided on the inner wall of the upper mold assembly, and a lower inner mold is provided on the inner wall of the middle mold assembly. The upper inner mold and the lower inner mold are combined to form a mold cavity. A mold core is provided inside the mold cavity, and a vulcanized air spring inner bladder cavity is formed between the inner wall of the mold cavity and the mold core. An injection channel is provided inside the upper mold assembly. One end of the injection channel is connected to the cavity, and the other end of the injection channel is connected to the outside of the molding die.

[0007] In one embodiment of the present invention, the upper mold assembly includes an upper template, an upper mold frame, and a side panel. The upper template is located on the side away from the middle mold assembly. The upper mold frame is connected to the upper template, and the side panel is connected to the upper mold frame. The side panel and the side wall of the upper mold frame form a high-temperature cavity for a vulcanized air spring inner bladder. The side panel is provided with an air inlet channel and an air outlet channel connected to the high-temperature cavity.

[0008] In one embodiment of the present invention, a partition is provided inside the high-temperature cavity, the partition dividing the high-temperature cavity into an air inlet cavity and an air outlet cavity, and a connecting channel is provided on the partition for connecting the air inlet cavity and the air outlet cavity, the air inlet channel being connected to the air inlet cavity, and the air outlet channel being connected to the air outlet cavity.

[0009] In one embodiment of the present invention, a glue injection port is provided at the end of the glue injection channel away from the cavity, and the diameter of the glue injection port is larger than the diameter of the glue injection channel.

[0010] In one embodiment of the present invention, the cross-section of the glue injection channel gradually increases from the glue injection port to the cavity.

[0011] In one embodiment of the present invention, the middle mold assembly is composed of at least two detachable middle mold frames, the inner wall of the middle mold frame is provided with a lower inner mold unit, each of the lower inner mold units constitutes the lower inner mold, and at least one of the outer walls of the middle mold frame is provided with a moving component for driving the middle mold frame to move relative to the lower mold assembly.

[0012] In one embodiment of the present invention, the moving component includes a moving power unit and a connecting rod. The connecting rod is connected to the middle mold frame, and the moving power unit drives the connecting rod to move, thereby driving the middle mold component to close or separate.

[0013] In one embodiment of the present invention, the lower mold assembly includes a lower template and a mounting platform disposed on the lower template, and the movable component is disposed on the mounting platform.

[0014] In one embodiment of the present invention, a base is provided at one end of the lower mold assembly away from the middle mold assembly, the lower mold assembly is connected to the base, a through hole is provided on the lower mold assembly, the mold core passes through the through hole into the cavity, and is connected to the base.

[0015] In one embodiment of the present invention, a groove is provided on the inner wall of the lower inner mold near the lower mold assembly, and the groove is used to form an outward flange when vulcanizing the inner bladder of the air spring.

[0016] The beneficial effects of this utility model are as follows: This utility model proposes a molding die for an air spring inner bladder. By setting a mold cavity in the molding die and setting a mold core in the mold cavity, the cavity of the air spring inner bladder is formed between the inner wall of the mold cavity and the outer wall of the mold core. During the vulcanization process, the mold core supports the air spring inner bladder. Since the mold core does not deform, as long as the distance between the inner wall of the mold cavity and the mold core is constant, the thickness of the air spring inner bladder after molding is also constant. This makes the expansion of the air spring inner bladder uniform throughout the air spring bladder during manufacturing. Attached Figure Description

[0017] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0018] In the attached diagram:

[0019] Figure 1 A schematic diagram of the structure of a molding die for an air spring inner bladder provided in an embodiment of this utility model;

[0020] Figure 2 for Figure 1 Enlarged view of A in the middle;

[0021] Figure 3 for Figure 1 Enlarged view of B in the middle;

[0022] Figure 4 This is a schematic diagram of the structure of the air spring inner bladder provided in one embodiment of the present invention.

[0023] The attached figures are labeled as follows:

[0024] 1-Upper template, 2-Upper mold frame, 3-Side panel, 4-Injection port, 5-Injection channel, 6-Upper inner mold, 7-Lower inner mold, 8-Middle mold frame, 9-Moving power unit, 10-Connecting rod, 11-Lower template, 12-Mounting platform, 13-Base, 14-Mold core, 15-Inlet channel, 16-Outlet channel, 17-Inlet cavity, 18-Outlet cavity, 19-Groove, 20-Partition plate. Detailed Implementation

[0025] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0026] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. The drawings only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0027] In the following description, numerous details are explored to provide a more thorough explanation of embodiments of the present invention. However, it will be apparent to those skilled in the art that embodiments of the present invention may be practiced without these specific details. In other embodiments, well-known structures and devices are shown in block diagram form rather than in detail to avoid obscuring embodiments of the present invention.

[0028] Please see Figure 1 , Figure 1 A molding die for an air spring inner bladder is provided as an embodiment of this utility model, such as... Figure 1 As shown, the molding die includes an upper mold assembly, a middle mold assembly, and a lower mold assembly, with the middle mold assembly located between the upper mold assembly and the lower mold assembly.

[0029] The upper mold assembly has an upper inner mold 6 on its inner wall, and the middle mold assembly has a lower inner mold 7 on its inner wall. The upper inner mold 6 and the lower inner mold 7 together form the inner wall of the mold cavity. A mold core 14 is provided inside the mold cavity, and the cavity for vulcanizing the air spring inner bladder is formed between the inner wall of the mold cavity and the mold core 14. The mold core 14 is fixed, and its shape will not change with different temperatures and air pressures. As long as the distance between the inner wall of the mold cavity and the mold core 14 is constant, the thickness of the air spring inner bladder after production is also constant.

[0030] In some embodiments, the inner diameter of the middle part of the inner wall of the mold cavity is larger than the inner diameters of its two ends, and the diameter of the middle part of the mold core 14 is also larger than the diameters of its two ends. This results in the air spring inner bladder being produced with a middle diameter larger than its two end diameters. This is equivalent to the outer wall of the mold core 14 being parallel to the inner wall of the mold cavity at all points, and the spacing at each point being the same. Figure 4 As shown, this results in a uniform distribution of annular stress in the air spring bladder, and also avoids stress peaks in the transition areas at both ends, thereby improving the service life of the air spring bladder.

[0031] In some embodiments, the inner wall of the mold cavity is divided into a first section, a second section, and a third section from top to bottom. The diameter of the second section is larger than the diameters of the first and third sections. The diameters gradually increase from the first to the second section and gradually decrease from the second to the third section. The diameters of the first and third sections can be the same or different. The first, second, and third sections are all cylindrical. Of course, the outer shape of the mold core 14 is the same as that of the inner wall of the mold cavity.

[0032] In some embodiments, the inner wall of the mold cavity is a smoothly transitioning arc shape from the first segment to the third segment.

[0033] In some embodiments, such as Figure 3As shown, a groove 19 is provided on the inner wall of the lower inner mold 7 near the lower mold assembly, which makes the formed air spring inner bladder have an outward flange, which can facilitate the fixing of the air spring inner bladder.

[0034] The upper mold assembly includes an upper template 1, an upper mold frame 2, and side panels 3. The upper template 1 is located on the side away from the middle mold assembly. The upper mold frame 2 is connected to the upper template 1, and the side panels 3 are connected to the upper mold frame 2. The upper mold frame 2 can be connected to an upper pressure connecting seat, and the upper pressure connecting seat can be moved up and down by the equipment, thereby moving the upper mold assembly up and down, or the upper mold frame 2 can be moved up and down directly by the equipment. After vulcanization, the upper mold assembly is first separated from the middle mold assembly upwards.

[0035] The upper mold assembly is provided with an injection channel 5. One end of the injection channel 5 is connected to the cavity, and the other end of the injection channel 5 is connected to the outside of the molding die. The distance between the top of the mold core 14 and the upper mold plate 1 is the same as the distance between the side wall of the mold core 14 and the inner wall of the mold cavity.

[0036] In some embodiments, the glue injection channel 5 is disposed on the upper template 1, and a glue injection port 4 is provided at the end of the glue injection channel 5 away from the cavity. In order to improve the glue injection efficiency, the diameter of the glue injection port 4 is larger than the diameter of the glue injection channel 5. The cross-section of the glue injection channel 5 gradually increases from the glue injection port 4 to the cavity. After the liquid glue enters the glue injection port 4, it enters the glue injection channel 5. The glue injection channel 5, with its gradually increasing cross-section from top to bottom, allows the glue to enter smoothly and diffuse quickly into the cavity.

[0037] In some embodiments, a stepped hole is provided on the upper mold frame 2, and a boss is provided on the outer edge of the upper template 1. The upper template 1 passes through the stepped hole, and the boss is engaged with the step of the stepped hole. Then, the upper template 1 is connected to the upper mold frame 2 by bolts. The upper edge of the upper template 1 is flush with the upper edge of the upper mold frame 2.

[0038] The upper mold frame 2 has a T-shaped cross-section, and the upper inner mold 6 is located inside the side wall of the upper mold frame 2. The side panels 3 are arranged parallel to the side walls of the upper mold frame 2, such as... Figure 1 As shown, mounting holes are provided on the upper mold frame 2. After the side panel 3 passes through the mounting holes, both the upper and lower ends of the side panel 3 are connected to the upper mold frame 2. The side panel 3 and the upper mold frame 2 can be connected by welding.

[0039] A high-temperature cavity, forming a vulcanized air spring bladder, is provided between the side panel 3 and the side wall of the upper mold frame 2. The side panel 3 is provided with an air inlet channel 15 and an air outlet channel 16 connected to the high-temperature cavity. By injecting high-temperature gas into the high-temperature cavity, the high-temperature gas causes the resin in the cavity to solidify.

[0040] In some embodiments, a partition 20 is provided inside the high-temperature cavity, dividing the high-temperature cavity from top to bottom into an inlet cavity 17 and an outlet cavity 18. The partition 20 has connecting channels for communicating between the inlet cavity 17 and the outlet cavity 18. One end of the partition 20 is connected to the upper mold frame 2, and the other end is connected to the side panel 3. The partition 20 can have multiple connecting channels, allowing the high-temperature gas to remain in the inlet cavity for a longer period. These multiple connecting channels can be evenly distributed around the circumference of the partition 20, or arranged in an array.

[0041] One end of the air intake channel 15 is connected to the air intake chamber 17, and the other end of the air intake channel 15 is connected to the outside of the side panel 3; one end of the air outlet channel 16 is connected to the air outlet chamber 18, and the other end of the air outlet channel 16 is connected to the outside of the side panel 3. An air intake valve is provided on the air intake channel 15, and an air outlet valve is provided on the air outlet channel 16. By controlling the closing of the air intake valve and the air outlet valve, the residence time of the high-temperature gas in the high-temperature chamber is controlled, thereby ensuring the vulcanization temperature.

[0042] In some embodiments, the intermediate mold assembly consists of at least two separable intermediate mold frames 8. After vulcanization, adjacent intermediate mold frames 8 can be separated when removing the air spring inner bladder, allowing for relatively easy removal of the air spring inner bladder. A lower inner mold 7 is installed on the inner wall of the intermediate mold frame 8. The intermediate mold assembly consists of multiple intermediate mold frames 8, and each intermediate mold frame 8 has a lower inner mold unit on its inner wall. The lower inner mold units together form the lower inner mold 7. The upper and lower ends of the lower inner mold 7 connected to the corresponding intermediate mold frame 8 can also be fixed by welding.

[0043] In some embodiments, adjacent intermediate mold frames 8 can be fixed by a snap-fit ​​method. In order to save manpower, a movable component is used to connect to the outer wall of at least one of the intermediate mold frames 8. The movable component drives the intermediate mold frame 8 to move relative to the lower mold assembly, thereby separating or closing the intermediate mold assembly.

[0044] The movable component includes a movable power unit 9 and a connecting rod 10. The connecting rod 10 is connected to the middle mold frame 8. The movable power unit 9 drives the connecting rod 10 to move, thereby driving the various middle mold frames 8 of the middle mold component to close or separate.

[0045] In some embodiments, the moving power unit 9 is a cylinder, and the connecting rod 10 is connected to the piston of the cylinder. The cylinder's contraction drives the intermediate mold frame 8 to move. As shown in the figure, the intermediate mold assembly consists of two intermediate mold frames 8. Under normal conditions, the cylinder does not move, and the two intermediate mold frames 8 are separate. When it is necessary to vulcanize the air spring inner bladder, the cylinder moves to close the two intermediate mold frames 8. After vulcanization is completed, the cylinder separates the intermediate mold frames 8 again.

[0046] The mobile power unit 9 can also be a motor. One end of the connecting rod 10 is connected to the output end of the motor, and the other end of the connecting rod 10 can be threaded. A threaded hole is provided in the middle mold frame 8, and then the motor drives the connecting rod 10 to rotate. The rotation of the connecting rod 10 drives the middle mold frame 8 to move.

[0047] In some embodiments, in order to make the middle mold frame 8 slide more smoothly relative to the lower mold assembly, a guide structure can be set between the middle mold frame 8 and the lower mold assembly. For example, a guide rail can be installed on the lower mold assembly, and a slider can be installed at the bottom of the middle mold frame 8. The movement of the middle mold frame 8 can be guided and limited by the cooperation between the slider and the guide rail, so as to ensure that the middle mold frame 8 can close smoothly next time.

[0048] In some embodiments, the lower mold assembly includes a lower template 11, on which a mounting platform 12 is provided. The mounting platform 12 is disposed on the lower template 11 and is spaced apart from the middle mold frame 8, allowing the middle mold frame 8 to be separated. The mounting platform 12 protrudes towards the upper mold frame 2. The movable component is mounted on the mounting platform 12, thus allowing the movable component to be raised to a certain height, connecting the movable component to the middle of the middle mold frame 8, making it easier to move the middle mold frame 8.

[0049] The mounting platform 12 can be a separate component installed on the lower template 11, and can move left and right according to the outer dimensions of the middle mold frame 8 to change the position of the moving component relative to the middle mold frame 8. The mounting platform 12 can also be configured as a lifting type, and the height position of the moving component relative to the lower template 11 can be changed by adjusting the height of the mounting platform 12. The mounting platform 12 can also be integrally formed with the lower template 11.

[0050] A base 13 is provided at the end of the lower mold assembly away from the middle mold assembly. The lower mold assembly and the base 13 are connected by bolts. A through hole is provided on the lower mold assembly. The bottom of the mold core 14 passes through the through hole and is connected to the base 13 by bolts.

[0051] Working process: After the mold core 14 passes through the lower mold plate 11, it is connected and fixed to the base 13. Before use, the moving power unit 9 is not activated, and the middle mold frames 8 are in a separated state. When in use, the moving power unit 9 closes the middle mold frames 8, and then moves the upper mold frame 2 and the upper mold plate 1 downwards to install them with the middle mold assembly. The adhesive is injected into the cavity from the injection port 4 of the upper mold plate 1. At the same time, the ventilation device injects gas into the air inlet cavity 17 from the air inlet channel 15. The high-temperature gas vulcanizes the adhesive in the cavity, and then the gas flows out from the air outlet channel 16. Under the action of high temperature, the air spring inner bladder is shaped. After the air spring inner bladder is vulcanized and shaped, the air inlet valve is closed. First, the upper mold assembly is removed upwards, then the moving power unit 9 separates the middle mold frame 8, and finally the air spring inner bladder is removed.

[0052] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A molding die for an air spring inner bladder, characterized in that: The device includes an upper mold assembly, a middle mold assembly, and a lower mold assembly. The middle mold assembly is located between the upper mold assembly and the lower mold assembly. An upper inner mold is provided on the inner wall of the upper mold assembly, and a lower inner mold is provided on the inner wall of the middle mold assembly. The upper inner mold and the lower inner mold are combined to form a mold cavity. A mold core is provided inside the mold cavity, and a cavity for a vulcanized air spring bladder is formed between the inner wall of the mold cavity and the mold core. An injection channel is provided inside the upper mold assembly. One end of the injection channel is connected to the cavity, and the other end of the injection channel is connected to the outside of the molding die.

2. The molding die for an air spring inner bladder according to claim 1, characterized in that: The upper mold assembly includes an upper template, an upper mold frame, and a side panel. The upper template is located on the side away from the middle mold assembly. The upper mold frame is connected to the upper template, and the side panel is connected to the upper mold frame. The side panel and the side wall of the upper mold frame form a high-temperature cavity for the vulcanized air spring inner bladder. The side panel is provided with an air inlet channel and an air outlet channel connected to the high-temperature cavity.

3. The molding die for an air spring inner bladder according to claim 2, characterized in that: The high-temperature chamber is provided with a partition, which divides the high-temperature chamber into an air inlet chamber and an air outlet chamber from top to bottom. The partition is provided with a connecting channel for connecting the air inlet chamber and the air outlet chamber. The air inlet channel is connected to the air inlet chamber, and the air outlet channel is connected to the air outlet chamber.

4. The molding die for an air spring inner bladder according to claim 2, characterized in that: The glue injection channel has a glue injection port at one end away from the cavity, and the diameter of the glue injection port is larger than the diameter of the glue injection channel.

5. The molding die for an air spring inner bladder according to claim 4, characterized in that: The cross-section of the glue injection channel gradually increases from the glue injection port to the cavity.

6. The molding die for an air spring inner bladder according to claim 1, characterized in that: The middle mold assembly consists of at least two detachable middle mold frames; the inner wall of the middle mold frame is provided with a lower inner mold unit, and each of the lower inner mold units constitutes the lower inner mold; at least one of the middle mold frames is provided with a moving component for driving the middle mold frame to move relative to the lower mold assembly on its outer wall.

7. The molding die for an air spring inner bladder according to claim 6, characterized in that: The moving component includes a moving power unit and a connecting rod. The connecting rod is connected to the middle mold frame. The moving power unit drives the connecting rod to move, thereby driving the middle mold component to close or separate.

8. The molding die for an air spring inner bladder according to claim 6, characterized in that: The lower mold assembly includes a lower template and a mounting platform disposed on the lower template, and the moving component is disposed on the mounting platform.

9. The molding die for an air spring inner bladder according to claim 1, characterized in that: The lower mold assembly has a base at one end away from the middle mold assembly. The lower mold assembly is connected to the base. The lower mold assembly has a through hole. The mold core passes through the through hole into the cavity and is connected to the base.

10. The molding die for an air spring inner bladder according to claim 1, characterized in that: A groove is provided on the inner wall of the lower inner mold near the lower mold assembly. The groove is used to form an outward flange when vulcanizing the inner bladder of the air spring.

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