Compression molding equipment for modified PTFE (Polytetrafluoroethylene)

Abstract

The utility model belongs to the technical field of mould pressing of modified PTFE (Polytetrafluoroethylene), particularly relates to mould pressing forming equipment of modified PTFE, and provides the following scheme aiming at the problems that in the prior art, a PTFE product shrinks at a low temperature and expands at a high temperature due to a polytetrafluoroethylene material, and the dimensional stability is poorer. The mold pressing seat is fixedly installed on the base, a material guiding barrel is rotationally connected to the mold pressing seat, a first electric push rod is fixedly arranged at the bottom of the mold pressing seat, a jacking plate is fixedly connected to the top end of the first electric push rod, a lower heating piece is arranged in the jacking plate, a jacking hole is formed in the bottom wall of the mold pressing seat, and the jacking plate is clamped in the jacking hole of the mold pressing seat; and two side plates are fixedly mounted on the base at equal intervals. The mold is simple in structure, during compression molding, the product is kept at the constant temperature of about 120 DEG C for 2 hours through constant-temperature equipment, the internal stress of the product is removed, product size shrinkage caused by stress and temperature difference is reduced, product size stability is improved, and people can use the mold conveniently.

Description

Technical Field

[0001] This utility model relates to the field of molding technology of modified PTFE, and in particular to a molding equipment for modified PTFE. Background Technology

[0002] PTFE is short for polytetrafluoroethylene. As a sealing material, PTFE has many applications. Due to its high corrosion resistance, stable physical properties, and resistance to high and low temperatures, it is widely used in the petroleum, chemical, pharmaceutical, power, and steel industries. The raw material for PTFE is powder. The powder is placed in a mold and then pressed to form a preform. After demolding and trimming, it is sintered and shaped to produce the finished product.

[0003] In existing technologies, PTFE products exhibit poor dimensional stability due to the shrinkage of polytetrafluoroethylene (PTFE) materials at low temperatures and their expansion at high temperatures. To address this issue, we propose a compression molding method using modified PTFE. Utility Model Content

[0004] The purpose of this invention is to solve the shortcomings of existing PTFE products, which have poor dimensional stability due to the shrinkage of polytetrafluoroethylene material at low temperatures and the expansion at high temperatures. Therefore, a modified PTFE compression molding equipment is proposed.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A compression molding apparatus for modified PTFE, comprising:

[0007] Base;

[0008] A molding base is fixedly installed on a base. A guide cylinder is rotatably connected to the molding base. An electric push rod is fixedly installed at the bottom of the molding base. A lifting plate is fixedly connected to the top of the electric push rod. A lower heating element is provided inside the lifting plate. A lifting hole is opened on the bottom wall of the molding base. The lifting plate is engaged in the lifting hole of the molding base. Two side plates are fixedly installed at equal intervals on the base. A controller is provided on one side of one of the side plates. A top plate is fixedly installed between the two side plates. A machine box is fixedly installed on the base. A rotary motor is fixedly installed inside the machine box. Two side heating elements are provided on the inner wall of the molding base.

[0009] A rotating material guiding mechanism is located above the molding base and is used to evenly guide the material into the molding base.

[0010] Furthermore, the rotating material guiding mechanism includes a rotating shaft rotatably connected to the machine housing, the rotating shaft being fixedly connected to the output shaft of the rotary motor, a drive gear being fixedly connected to the top end of the rotating shaft, and a gear ring being fixedly connected to the outer wall of the material guiding cylinder. The gear ring meshes with the drive gear, and the meshing between the drive gear and the gear ring causes the drive gear to drive the material guiding cylinder to rotate through the gear ring.

[0011] Furthermore, multiple L-shaped supports are symmetrically fixedly connected to the gear ring, and each L-shaped support is fixedly equipped with a metering cylinder.

[0012] Furthermore, a discharge pipe is provided on one side of the metering cylinder, with one end of the discharge pipe located above the guide cylinder. A control valve is provided on the discharge pipe. By opening the control valve, the material in the metering cylinder can be discharged through the discharge pipe.

[0013] Furthermore, the metering cylinder is provided with a top cover, and the top cover is provided with a handle.

[0014] Furthermore, two electric push rods are fixedly installed on the top plate, and a molding plate is fixedly connected to the bottom end of the two electric push rods. An upper heating element is installed inside the molding plate.

[0015] Compared with the prior art, the advantages of this utility model are:

[0016] 1. In this solution, the drive gear drives the guide cylinder to rotate at a constant speed on the molding base through the gear ring. At the same time, the material in multiple metering cylinders is evenly discharged into the molding base through multiple discharge pipes, thereby achieving the effect of uniform material feeding.

[0017] 2. In this solution, two electric push rods drive the molding plate downwards and cooperate with the molding base to squeeze the material inside the molding base. During molding, the controller is used to activate the upper heating plate, the two side heating plates and the lower heating plate to shorten the heating and cooling time, so that the molecules are arranged tightly and neatly with small gaps between molecules, thereby ensuring the strength and hardness of the product.

[0018] This utility model has a simple structure. During the molding process, the product is kept at a constant temperature of about 120 degrees Celsius for 2 hours to remove internal stress, reduce product shrinkage caused by stress and temperature difference, increase product dimensional stability, and make it convenient for people to use. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of a compression molding equipment for modified PTFE proposed in this utility model;

[0020] Figure 2 This utility model proposes a compression molding device for modified PTFE. Figure 1 A schematic diagram of the structure of part A in the diagram;

[0021] Figure 3 This is a three-dimensional structural diagram of the electric push rod and lifting plate of a modified PTFE compression molding equipment proposed in this utility model.

[0022] In the diagram: 1. Base; 2. Molding seat; 3. Guide cylinder; 4. Electric push rod one; 5. Lifting plate; 6. Side plate; 7. Controller; 8. Top plate; 9. Chassis; 10. Rotary motor; 11. Rotary shaft; 12. Drive gear; 13. Gear ring; 14. L-shaped support; 15. Metering cylinder; 16. Discharge pipe; 17. Control valve; 18. Top cover; 19. Handle; 20. Electric push rod two; 21. Molding plate; 22. Upper heating plate; 23. Fixed head; 24. Rubber rod; 25. Rubber ball. Detailed Implementation

[0023] The technical solutions in this embodiment will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this embodiment, and not all embodiments.

[0024] Example 1

[0025] Reference Figures 1-3 A compression molding apparatus for modified PTFE, comprising:

[0026] Base 1;

[0027] A molding base 2 is fixedly installed on a base 1. A guide cylinder 3 is rotatably connected to the molding base 2. An electric push rod 4 is fixedly installed at the bottom of the molding base 2. A lifting plate 5 is fixedly connected to the top of the electric push rod 4. A lower heating plate is provided inside the lifting plate 5. A lifting hole is opened on the bottom wall of the molding base 2. The lifting plate 5 is engaged in the lifting hole of the molding base 2. Two side plates 6 are fixedly installed at equal intervals on the base 1. A controller 7 is provided on one side of one of the side plates 6. A top plate 8 is fixedly installed between the two side plates 6. A housing 9 is fixedly installed on the base 1. A rotary motor 10 is fixedly installed inside the housing 9. Two side heating plates are provided on the inner wall of the molding base 2.

[0028] A rotating material guiding mechanism is located above the molding base 2 and is used to uniformly guide the material into the molding base 2.

[0029] In this embodiment, the rotating material guiding mechanism includes a rotating shaft 11 rotatably connected to the housing 9. The rotating shaft 11 is fixedly connected to the output shaft of the rotating motor 10. A drive gear 12 is fixedly connected to the top of the rotating shaft 11. A gear ring 13 is fixedly connected to the outer wall of the material guiding cylinder 3. The gear ring 13 meshes with the drive gear 12. By utilizing the meshing between the drive gear 12 and the gear ring 13, the drive gear 12 drives the material guiding cylinder 3 to rotate through the gear ring 13. Multiple L-shaped supports 14 are symmetrically fixedly connected to the gear ring 13. A metering cylinder 15 is fixedly provided on each L-shaped support 14. A discharge pipe 16 is provided on one side of the metering cylinder 15. One end of the discharge pipe 16 is located above the material guiding cylinder 3. A control valve 17 is provided on the discharge pipe 16. By opening the control valve 17, the material in the metering cylinder 15 can be discharged through the discharge pipe 16. A top cover 18 is provided on the metering cylinder 15. A handle 19 is provided on the top cover 18.

[0030] In this embodiment, two electric push rods 20 are fixedly installed on the top plate 8. The bottom ends of the two electric push rods 20 are fixedly connected to the molding plate 21. The molding plate 21 is provided with an upper heating element 22. The two electric push rods 20 drive the molding plate 21 to move downward and enter the molding seat 2 to squeeze the material. At the same time, the upper heating element 22 is used to heat the material.

[0031] The implementation principle of a modified PTFE compression molding device according to an embodiment of this application is as follows: First, the raw materials are modified according to performance requirements. The modifier is filled into the PTFE suspension in a certain proportion. After high-speed blending and sieving, the high dispersion and uniform mixing of the raw materials are ensured. The top cover 18 is removed from multiple metering cylinders 15 by the handle 19. A certain amount of material is added to the multiple metering cylinders 15. The top cover 18 is then closed, the material control valve 17 is opened, and the rotary motor 10 is started using the controller 7, so that the rotary shaft 11 drives the drive gear. As wheel 12 rotates, the meshing between drive gear 12 and gear ring 13 causes drive gear 12 to drive guide cylinder 3 to rotate uniformly on molding base 2 via gear ring 13. Simultaneously, materials from multiple metering cylinders 15 are evenly discharged into molding base 2 through multiple discharge pipes 16, achieving uniform material feeding. After feeding, controller 7 drives two electric push rods 20, causing them to move molding plate 21 downwards and cooperate with molding base 2 to compress the material within molding base 2. This product is used for processing PTFE products. To relieve stress, the molded product is kept at approximately 120 degrees Celsius for 2 hours in a constant temperature device to remove internal stress, reduce dimensional shrinkage caused by stress and temperature differences, and increase dimensional stability. Then, the product undergoes five-stage gradient finishing at a constant temperature of 30 degrees Celsius. After each gradient is completed, the product is returned to 20 degrees Celsius for 4 hours, then returned to 30 degrees Celsius for further finishing. This process is repeated until a product with stable dimensions and meeting accuracy standards is obtained. During compression molding, the controller 7 activates the upper heating element 22 and the two side heating elements. The heating element and the lower heating plate raise the temperature to 385℃, shortening the heating and cooling time. This ensures that the molecules are tightly and neatly arranged with small gaps between them, thus guaranteeing the product's strength and hardness. After processing, two electric push rods 20 drive the molding plate 21 to move upward and reset. At the same time, electric push rod 4 drives the lifting plate 5 to move upward and eject the molded product from the molding seat 2. This product has excellent strength and hardness, is easy to industrialize, and has significant social and economic benefits. It has a wide range of applications, a large market demand, and a very broad prospect.

[0032] Example 2

[0033] Example 2 is the same as Example 1 in the rest, except that: a fixing head 23 is fixedly provided on each of the two side plates 6, and a rubber rod 24 is fixedly provided on each of the two fixing heads 23. One end of each of the two rubber rods 24 is fixedly connected to a rubber ball 25. When the multiple metering cylinders 15 rotate, they can collide with the two rubber balls 25, thereby causing the multiple metering cylinders 15 to vibrate, thereby causing the material attached to the inner wall of the multiple metering cylinders 15 to slide off. All structures in this application can be selected in terms of material and length according to actual use. The attached drawings are schematic structural diagrams, and the actual dimensions can be adjusted appropriately.

[0034] The above description is only a preferred embodiment of this practice, but the scope of protection of this embodiment is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the scope of the technology disclosed in this embodiment, based on the technical solution and the inventive concept of this embodiment, should be covered within the scope of protection of this embodiment.

Claims

1. A compression molding apparatus for modified PTFE, characterized in that, include: Base (1); A molding base (2) is fixedly installed on a base (1). A guide cylinder (3) is rotatably connected to the molding base (2). An electric push rod (4) is fixedly installed at the bottom of the molding base (2). A lifting plate (5) is fixedly connected to the top of the electric push rod (4). A lower heating plate is provided inside the lifting plate (5). A lifting hole is opened on the bottom wall of the molding base (2). The lifting plate (5) is engaged in the lifting hole of the molding base (2). Two side plates (6) are fixedly installed at equal distances on the base (1). A controller (7) is provided on one side of one of the side plates (6). A top plate (8) is fixedly installed between the two side plates (6). A machine box (9) is fixedly installed on the base (1). A rotary motor (10) is fixedly installed inside the machine box (9). Two side heating plates are provided on the inner wall of the molding base (2). A rotating material guiding mechanism is located above the molding base (2) and is used to uniformly guide the material into the molding base (2).

2. The molding equipment for modified PTFE according to claim 1, characterized in that, The rotating material guiding mechanism includes a rotating shaft (11) rotatably connected to the housing (9), the rotating shaft (11) being fixedly connected to the output shaft of the rotating motor (10), a drive gear (12) being fixedly connected to the top of the rotating shaft (11), and a gear ring (13) being fixedly connected to the outer wall of the material guiding cylinder (3), the gear ring (13) meshing with the drive gear (12).

3. The compression molding equipment for modified PTFE according to claim 2, characterized in that, Multiple L-shaped supports (14) are symmetrically fixedly connected to the gear ring (13), and each L-shaped support (14) is fixedly provided with a metering cylinder (15).

4. The compression molding equipment for modified PTFE according to claim 3, characterized in that, The metering cylinder (15) has a discharge pipe (16) on one side, one end of which is located above the guide cylinder (3), and a control valve (17) is provided on the discharge pipe (16).

5. The compression molding equipment for modified PTFE according to claim 3, characterized in that, The metering cylinder (15) is provided with a top cover (18), and the top cover (18) is provided with a handle (19).

6. The compression molding equipment for modified PTFE according to claim 1, characterized in that, Two electric push rods (20) are fixedly installed on the top plate (8). The bottom ends of the two electric push rods (20) are fixedly connected to a molding plate (21). An upper heating element (22) is provided inside the molding plate (21).

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