Air spring bag forming die and air spring bag

Abstract

The utility model provides a kind of air spring bag forming die and air spring bag, wherein air spring bag forming die includes upper die assembly, middle die assembly and lower die assembly, middle die assembly is between upper die assembly and lower die assembly, middle die assembly is made of at least two middle die frames, the inner wall of upper die assembly is provided with upper inner die, the inner wall of middle die frame is provided with lower inner die, upper inner die and lower inner die are combined to form die cavity, the inner diameter of the inner wall middle part of die cavity is greater than the inner diameter of both ends.The inner wall of die cavity formed by upper inner die and lower inner die is the shape of large middle part and small both ends, the formed ellipsoidal air spring bag is more uniform when ring stress distribution is pressed inside, avoid sharp stress peak, can reduce the risk of air spring bag being damaged, increase the service life of air spring bag.Meanwhile, middle die assembly is separable, so that air spring bag can be taken out more conveniently.

Description

Technical Field

[0001] This utility model relates to the field of air spring bladder technology, and in particular to an air spring bladder molding mold and an air spring 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] In the prior art, most air spring bladders are cylindrical, which has a limited range of extension and deformation. When a cylindrical air spring bladder is subjected to pressure inside, the circumferential pressure distribution may be uneven, especially at both ends, where stress peaks may be generated, which will accelerate the damage of the air spring bladder and affect its lifespan. Summary of the Invention

[0004] This invention provides an air spring bladder molding die and an air spring bladder to solve the technical problem that uneven stress distribution in existing cylindrical air spring bladders may generate stress peaks at both ends, affecting the lifespan of the air spring bladder.

[0005] This utility model provides an air spring bladder molding die, 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. The middle mold assembly is composed of at least two middle mold frames. An upper inner mold is provided on the inner wall of the upper mold assembly, and a lower inner mold unit is provided on the inner wall of the middle mold frame. The lower inner mold units are combined to form a lower inner mold. The upper inner mold and the lower inner mold are combined to form a mold cavity for vulcanizing an air spring bladder. The inner diameter of the mold cavity at the middle in the vertical direction is larger than the inner diameter of the mold cavity at both ends in the vertical direction.

[0006] In one embodiment of the present invention, 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.

[0007] 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.

[0008] In one embodiment of the present invention, an inner bladder clamping plate is connected to the lower mold assembly, the inner bladder clamping plate fixes the inner bladder to the lower mold assembly, the inner bladder is located inside the mold cavity, and the outer wall of the inner bladder is used to support the air spring bladder.

[0009] In one embodiment of the present invention, the inner bladder has an open opening on the side near the lower mold assembly, the lower mold assembly has an air intake channel, one end of the air intake channel is connected to a ventilation device, and the other end of the air intake channel is a gas filling port; the opening of the inner bladder covers the gas filling port, and an air intake valve is provided on the air intake channel.

[0010] In one embodiment of this utility model, the inner bladder has an outward flange on the side near the lower mold assembly, and the outer wall of the inner bladder near the outward flange has a groove. The inner bladder clamping plate has a fixing boss on the side facing the inner bladder. The fixing boss is inserted into the groove. The lower surface of the outward flange abuts against the lower mold assembly, and the upper surface of the outward flange is flush with the lower surface of the groove. The fixing boss cooperates with the lower mold assembly to constrain the outward flange in the vertical direction.

[0011] In one embodiment of this utility model, the shape of the outer wall of the inner capsule is the same as the shape of the inner wall of the mold cavity.

[0012] 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 mounted on the mounting platform.

[0013] In one embodiment of the present invention, the upper mold assembly includes an upper template and an upper mold frame, the upper mold frame is connected to the upper template, and the upper inner mold is connected to the upper mold frame for shaping the upper part of the air spring bladder.

[0014] This utility model also provides an air spring bladder, wherein the diameter of the middle part of the air spring bladder is larger than the diameter of both ends.

[0015] The beneficial effects of this utility model are as follows: The air spring bladder molding mold and air spring bladder proposed in this utility model, through the combination of the upper inner mold and the lower inner mold, form an inner wall of the mold cavity with a shape that is larger in the middle and smaller at both ends. The resulting ellipsoidal air spring bladder exhibits a more uniform circumferential stress distribution when under internal pressure, especially in the transition areas at both ends, avoiding sharp stress peaks, reducing the risk of damage to the air spring bladder, and increasing its service life. Furthermore, the middle mold assembly is detachable; after the air spring bladder is formed, the upper mold assembly moves upward, and at least one of the middle mold frames moves laterally, thus facilitating the removal of the air spring bladder. Attached Figure Description

[0016] 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.

[0017] In the attached diagram:

[0018] Figure 1 This is a schematic diagram of the structure of an air spring bladder molding die provided in an embodiment of the present invention;

[0019] Figure 2 for Figure 1 Enlarged view of A in the middle;

[0020] Figure 3 for Figure 1 Enlarged view of B in the middle;

[0021] Figure 4 This is a schematic diagram of the structure of an air spring bladder provided in one embodiment of the present invention.

[0022] The attached figures are labeled as follows:

[0023] 1-Upper template, 2-Upper mold frame, 3-Upper inner mold, 4-Middle mold frame, 5-Lower inner mold, 6-Lower template, 7-Moving power unit, 8-Connecting rod, 9-Mounting platform, 10-Inner bladder, 11-Inner bladder clamping plate, 12-Air intake channel, 13-Air intake valve, 14-Outer flange, 15-Fixing boss, 16-Groove, 17-Air spring bladder. Detailed Implementation

[0024] 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.

[0025] 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.

[0026] 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.

[0027] Please see Figure 1 , Figure 1 This is a schematic diagram of the structure of an air spring bladder molding die provided in an embodiment of the present invention, as shown below. Figure 1 As shown, the air spring bladder molding die 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.

[0028] The upper mold assembly includes an upper template 1 and an upper mold frame 2. The upper mold frame 2 is connected to the upper template 1 and can be connected to the upper template 1 by bolts. This allows the upper template 1 to be removed first after vulcanization, and then the upper mold frame 2 to be separated from the middle mold assembly from the upper part of the middle mold assembly.

[0029] In some embodiments, an upper inner mold 3 is provided on the inner wall of the upper mold frame 2. The upper inner mold 3 and the upper mold frame 2 can be connected by welding or by bolts. The upper inner mold 3 is used to shape the outer wall of the upper part of the air spring bladder 17. The upper inner mold 3 is connected to the upper and lower parts of the upper mold frame 2 by welding.

[0030] The inner wall of the middle mold assembly is provided with multiple lower inner mold units, which are combined to form the lower inner mold 5. The upper inner mold 3 and the lower inner mold 5 are combined to form the mold cavity of the vulcanized air spring bladder. The inner diameter of the middle part of the mold cavity in the vertical direction is larger than the inner diameter of the two sides of the mold cavity in the vertical direction. That is, 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 diameter of the first and third sections. The diameter of the first section gradually increases from the second section to the third section, and the diameter of the second section gradually decreases from the third section to the first section. The diameters of the first section and the third section can be the same or different. The first section, the second section, and the third section are all straight cylindrical shapes. In some embodiments, the inner wall of the mold cavity is arc-shaped from top to bottom.

[0031] In some embodiments, the intermediate mold assembly consists of at least two separable intermediate mold frames 4. After vulcanization, the intermediate mold frames 4 can be separated when removing the air spring bladder 17, allowing for relatively easy removal of the air spring bladder 17. The lower inner mold 5 is installed on the inner wall of the intermediate mold frames 4. The intermediate mold assembly consists of multiple intermediate mold frames 4, and the corresponding lower inner mold 5 also consists of multiple parts, with each intermediate mold frame corresponding to one lower inner mold unit. When the lower inner mold 5 is connected to the corresponding intermediate mold frame 4, the upper and lower ends can also be fixed by welding.

[0032] In some embodiments, adjacent intermediate mold frames 4 can be fixed by snap-fit, and the intermediate mold frames 4 can be separated manually.

[0033] In some embodiments, in order to save manpower, a movable component is used to connect to the outer wall of at least one of the middle mold frames 4. The movable component drives the middle mold frame 4 to move relative to the lower mold assembly, thereby separating or closing the middle mold assembly.

[0034] The movable component includes a movable power unit 7 and a connecting rod 8. The connecting rod 8 is connected to the middle mold frame 4. The movable power unit 7 drives the connecting rod 8 to move, thereby driving the various middle mold frames 4 of the middle mold component to close or separate.

[0035] In some embodiments, the moving power unit 7 is a cylinder, and the connecting rod 8 is connected to the piston of the cylinder, so that the middle mold frame 4 is moved by the contraction of the cylinder. Figure 1 As shown, the intermediate mold assembly consists of two intermediate mold frames 4. Under normal conditions, the cylinder does not operate, and the two intermediate mold frames 4 are separate. When vulcanization of the air spring bladder 17 is required, the cylinder operates to close the two intermediate mold frames 4. After vulcanization is completed, the cylinder then separates the intermediate mold frames 4.

[0036] The mobile power unit 7 can also be a motor. One end of the connecting rod 8 is connected to the output end of the motor, and the other end of the connecting rod 8 can be threaded. A threaded hole is provided in the middle mold frame 4, and then the motor drives the connecting rod 8 to rotate. The rotation of the connecting rod 8 drives the middle mold frame 4 to move.

[0037] In some embodiments, in order to make the middle mold frame 4 slide more smoothly relative to the lower mold assembly, a guide structure can be set between the middle mold frame 4 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 4. The movement of the middle mold frame 4 can be guided and limited by the cooperation between the slider and the guide rail, so as to ensure that the middle mold frame 4 can close smoothly next time.

[0038] In some embodiments, the lower mold assembly includes a lower template 6, on which a mounting platform 9 is provided. The mounting platform 9 is positioned on the lower template 6 at a certain distance from the middle mold frame 4, allowing the middle mold frame 4 to be separated. The mounting platform 9 protrudes towards the upper mold frame 2. The movable component is mounted on the mounting platform 9, thus allowing the movable component to be raised to a certain height, connecting with the middle of the middle mold frame 4, making it easier to move the middle mold frame 4. The mounting platform 9 can be a separate component mounted on the lower template 6, and can be moved left and right according to the outer dimensions of the middle mold frame 4 to change the position of the movable component relative to the middle mold frame 4. The mounting platform 9 can also be configured as a lifting type, changing the height position of the movable component relative to the lower template 6 by adjusting the height of the mounting platform 9. The mounting platform 9 can also be integrally formed with the lower template 6.

[0039] An inner bladder clamping plate 11 is connected to the lower template 6, which fixes the inner bladder 10 to the lower template 6. The inner bladder 10 supports the air spring bladder 17. The inner bladder clamping plate 11 is connected to the lower template 6 by bolts. To prevent the bolts from interfering with the lower inner mold 5, recessed bolt holes are provided on the inner bladder clamping plate 11. After the bolts connect the inner bladder clamping plate 11 to the lower template 6, the top of the bolts is also located in the recessed bolt holes, and the top of the bolts does not contact the lower inner mold 5. In order not to affect the quality of the air spring bladder 17 after vulcanization, after the middle mold frame 4 is closed, the bottom of the lower inner mold 5 completely covers the bolt holes.

[0040] like Figure 3 As shown, the inner bladder 10 has an outward flange 14 on the side near the lower mold assembly, and the inner bladder clamping plate 11 has a fixing boss 15 for fixing the outward flange 14 on the side facing the inner bladder 10. The outward flange 14 is inserted into the lower part of the fixing boss 15, thereby fixing the lower part of the inner bladder 10 so that the inner bladder 10 cannot move up and down.

[0041] In some embodiments, to further fix the inner bladder 10, a groove 16 can be provided on the outer wall of the inner bladder 10 near the outer flange 14, that is, a groove 16 is provided on the upper side of the outer flange 14, and the groove 16 is provided on the outer wall of the inner bladder 10. The height of the groove 16 is the same as the thickness of the fixing boss 15. The lower surface of the outer flange 14 abuts against the lower mold assembly, and the upper surface of the outer flange 14 is flush with the lower surface of the groove 16. The fixing boss 15 cooperates with the lower mold assembly to constrain the outer flange 14 in the vertical direction. When the fixing boss 15 limits the outer flange 14, the fixing boss 15 is inserted into the groove 16, which can further limit the lateral movement of the inner bladder 10, thereby limiting the axial and radial movement of the inner bladder 10.

[0042] The inner bladder 10 is open on the side near the lower mold assembly. An air inlet channel 12 is provided inside the lower mold assembly. One end of the air inlet channel 12 is connected to a ventilation device, and the other end is connected to the inner bladder 10. An air inlet valve 13 is provided on the air inlet channel 12. The ventilation device inflates the inner bladder 10 through the air inlet channel 12, thereby causing the inner bladder 10 to expand and deform. The inner bladder 10 and the inner wall of the mold cavity provide double shaping of the inner and outer walls of the air spring bladder 17.

[0043] In order to make the shape of the molded air spring bladder 17 closer to the preset shape, the shape of the outer wall of the inner bladder 10 is the same as the shape of the inner wall of the mold cavity, so that the shape of the inside and outside of the molded air spring bladder 17 is the same, and it has a larger amount of contraction and expansion deformation when subjected to force.

[0044] This utility model also provides an air spring bladder 17, wherein the diameter of the middle part of the air spring bladder 17 is larger than the diameter of both ends, such as... Figure 4As shown, the middle section is vertical, and the two side sections are also vertical. The middle section and the two side sections are connecting sections. The diameter of the connecting section gradually decreases from the middle section to the sides, and the two ends of the connecting section are smoothly connected to the middle section and the two side sections respectively. The connecting section can be an inclined straight line or an arc.

[0045] Working process: The inner bladder 10 is fixed to the lower mold plate 6 by the inner bladder clamp 11. Then, the moving power unit 7 closes the middle mold frame 4 and installs the upper mold frame 2 and the upper mold plate 1. Then, the ventilation device inflates the inner bladder 10. The inner bladder 10 expands under the action of gas, opening the air spring bladder 17. The inner wall of the air spring bladder 17 contacts the inner bladder 10, and the outer wall contacts the cavity. Under the action of high temperature, the air spring bladder 17 is shaped. After the air spring bladder 17 is vulcanized and shaped, the air inlet valve 13 is closed. First, the upper mold plate 1 and the upper mold frame 2 are removed. Then, the moving power unit 7 separates the middle mold frame 4. Finally, the air spring bladder 17 is taken out.

[0046] This utility model provides an air spring bladder molding die and an air spring bladder 17. In the above solution, the inner wall of the mold cavity is larger in the middle and smaller on both sides. After vulcanization, the annular pressure distribution of the air spring bladder 17 is more uniform. The transition area at both ends avoids sharp stress peaks, which can reduce the risk of damage to the air spring bladder and increase the service life of the air spring bladder 17. At the same time, the middle mold assembly is separable. After the air spring bladder 17 is molded, after the upper mold assembly moves upward, at least one of the middle mold frames 4 moves laterally. This avoids the lower inner mold 5 contacting the middle of the air spring bladder 17 when the middle mold frame 4 is removed from bottom to top, so that the air spring bladder can be removed more easily.

[0047] 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 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. The middle mold assembly consists of at least two middle mold frames. The inner wall of the upper mold assembly is provided with an upper inner mold, and the inner wall of the middle mold frames is provided with lower inner mold units. The lower inner mold units are combined to form a lower inner mold. The upper inner mold and the lower inner mold are combined to form the mold cavity of a vulcanized air spring bladder. The inner diameter of the mold cavity at the middle in the vertical direction is larger than the inner diameter of the mold cavity at both ends in the vertical direction.

2. The air spring bladder forming mold according to claim 1, characterized in that: 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.

3. The air spring bladder forming mold according to claim 2, 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.

4. The air spring bladder forming mold according to claim 3, characterized in that: The lower mold assembly is connected to an inner bladder clamping plate, which fixes the inner bladder to the lower mold assembly. The inner bladder is located inside the mold cavity, and the outer wall of the inner bladder is used to support the air spring bladder.

5. The air spring bladder forming mold according to claim 4, characterized in that: The inner bladder has an open opening on the side near the lower mold assembly. The lower mold assembly has an air intake channel. One end of the air intake channel is connected to a ventilation device, and the other end of the air intake channel is a gas filling port. The opening of the inner bladder covers the gas filling port. An air intake valve is provided on the air intake channel.

6. The air spring bladder forming mold according to claim 4, characterized in that: The inner bladder has an outward flange on the side near the lower mold assembly. The outer wall of the inner bladder near the outward flange has a groove. The inner bladder clamping plate has a fixing boss on the side facing the inner bladder. The fixing boss is inserted into the groove. The lower surface of the outward flange abuts against the lower mold assembly. The upper surface of the outward flange is flush with the lower surface of the groove. The fixing boss cooperates with the lower mold assembly to constrain the outward flange in the vertical direction.

7. The air spring bladder forming mold according to claim 4, characterized in that: The shape of the outer wall of the inner capsule is the same as the shape of the inner wall of the mold cavity.

8. The air spring bladder molding die according to any one of claims 2-7, characterized in that: The lower mold assembly includes a lower template and a mounting platform disposed on the lower template, and the movable component is mounted on the mounting platform.

9. The air spring bladder forming mold according to claim 1, characterized in that: The upper mold assembly includes an upper template and an upper mold frame. The upper mold frame is connected to the upper template, and the upper inner mold is connected to the upper mold frame for shaping the upper part of the air spring bladder.

10. An air spring bladder, characterized in that: The diameter of the air spring bladder in the middle is larger than the diameters at both ends.

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