An extrusion molding die for a rubber seal

Abstract

The utility model discloses a kind of rubber sealing piece extrusion forming mould, including sleeve and inner core, sleeve and inner core are sequentially formed with entering cavity, neck cavity, mixing cavity and multiple circumferential setting forming cavity from front to back between them, the cross-sectional area of entering cavity is sequentially reduced from front to back and is communicated with neck cavity, neck cavity is straight cylinder annular cavity, the front end of mixing cavity is communicated with neck cavity, and its cross-sectional area is sequentially increased from front to back, the front end of forming cavity is communicated with mixing cavity, rear end is communicated with outside, the rear end of sleeve is provided with the fixed sleeve of insertion cooperation with inner core, forming cavity is set in its inner wall along the circumference of fixed sleeve, the front end of fixed sleeve is connected with inner core by multiple circumferential setting screw, rear end is provided with water-cooling wall.This rubber sealing piece extrusion forming mould has better mixing effect and inner core fixing effect, fixed sleeve inner wall and inner core are enclosed to form multiple forming cavities, can simultaneously extrude forming multiple rubber sealing strips.

Description

Technical Field

[0001] This utility model relates to the field of extrusion molding dies, specifically to an extrusion molding die for rubber seals. Background Technology

[0002] The extrusion molding of rubber seals involves heating and plasticizing the rubber compound in an extruder, and then forming the desired shape of the product through a die under the shearing force and propulsion of the screw.

[0003] Patent CN222972711U discloses a door and window sealing strip extrusion mold assembly, including a door and window sealing strip extruder. An extrusion mold assembly is provided on one side of the door and window sealing strip extruder, and an adjustable cooling component is installed on the top of the extrusion mold assembly. A conveying component is provided on the other side of the extrusion mold assembly. The extrusion mold assembly includes an extrusion pipe, and a mold mounting shell is fixedly connected to the side of the extrusion pipe. A sealing strip mold is engaged with one side of the mold mounting shell, and a mold support column is engaged with the bottom of the sealing strip mold. A pin shell is provided on the top of the mold mounting shell, and a pin body is provided inside the pin shell. A pin spring is elastically connected to one end of the pin body.

[0004] The door and window sealing strip extrusion die assembly is equipped with a sealing strip die, which can only extrude one sealing strip at a time, resulting in low extrusion efficiency. Utility Model Content

[0005] The purpose of this invention is to provide a rubber seal extrusion molding die, which has a better mixing effect and inner core fixing effect. The inner wall of the fixing sleeve and the inner core form multiple molding cavities, which can simultaneously extrude and mold multiple rubber sealing strips.

[0006] To achieve the above objectives, this utility model provides a rubber seal extrusion molding die, including an outer sleeve and an inner core. From front to back, an inlet cavity, a neck cavity, a mixing cavity, and multiple circumferentially arranged molding cavities are formed between the outer sleeve and the inner core. The cross-sectional area of ​​the inlet cavity decreases sequentially from front to back and communicates with the neck cavity. The neck cavity is a straight annular cavity. The front end of the mixing cavity communicates with the neck cavity, and its cross-sectional area increases sequentially from front to back. The front end of the molding cavity communicates with the mixing cavity, and its rear end communicates with the outside. A fixing sleeve is provided at the rear end of the outer sleeve to be inserted and fitted with the inner core. The molding cavity is arranged circumferentially on the inner wall of the fixing sleeve. The front end of the fixing sleeve is connected to the inner core by multiple circumferentially arranged screws, and a water-cooled wall is provided at the rear end.

[0007] Preferably, the fixing sleeve has a radial hole between two adjacent molding cavities for the screw to pass through, and the inner core has a screw hole on its side corresponding to the radial hole.

[0008] Preferably, the water-cooled wall includes an outer shell covering the fixed sleeve, a water-cooled cavity is formed between the outer shell and the outer wall of the fixed sleeve, and a water inlet is provided at the rear end of the outer shell and a water outlet is provided at the front end.

[0009] Preferably, the inner core has a tapered head at its front end.

[0010] Preferably, the front end of the outer jacket is provided with a flange ring, and the flange ring is provided with flange holes around it.

[0011] Preferably, the flange ring has an insertion port at its front end.

[0012] Preferably, a water stop is provided on the inner side of the insertion port.

[0013] Preferably, a sealing groove is provided at the front end of the flange ring between the insertion port and the flange hole.

[0014] Preferably, the inner wall of the fixing sleeve has an inclined surface at its front end.

[0015] According to the above technical solution, this utility model provides a rubber seal extrusion molding die, including an outer sleeve and an inner core. An inlet cavity, a neck cavity, a mixing cavity, and multiple circumferentially arranged molding cavities are sequentially formed between the outer sleeve and the inner core from front to back. The cross-sectional area of ​​the inlet cavity decreases sequentially from front to back and communicates with the neck cavity. The neck cavity is a straight cylindrical annular cavity. The front end of the mixing cavity communicates with the neck cavity, and its cross-sectional area increases sequentially from front to back. The front end of the molding cavity communicates with the mixing cavity, and its rear end communicates with the outside. A fixing sleeve is provided at the rear end of the outer sleeve to be inserted and fitted with the inner core. The molding cavity is arranged circumferentially on the inner wall of the fixing sleeve. The front end of the fixing sleeve is connected to the inner core by multiple circumferentially arranged screws, and a water-cooled wall is provided at the rear end.

[0016] The extrusion method and beneficial effects of this rubber seal extrusion molding die are as follows: During use, the front end of the outer sleeve of the rubber seal extrusion molding die is installed at the discharge port of the extrusion equipment. The molten raw material sequentially passes through the inlet cavity, neck cavity, mixing cavity, and multiple circumferentially arranged molding cavities. It is formed at the front end of the molding cavity and then water-cooled and solidified at the rear end by a water-cooling wall before exiting from the end of the molding cavity. Because the cross-sectional area of ​​the inlet cavity decreases sequentially from front to back and connects to the neck cavity, the molten raw material's flow is accelerated due to spatial compression in the inlet and neck cavities. It then enters the mixing cavity, where the pressure is released, and undergoes disordered mixing, increasing the mixing effect. Finally, it enters the multiple molding cavities, following the cavity shape to form the desired rubber sealing strip. The inner wall of the fixing sleeve and the inner core enclose multiple molding cavities. When the inner core is disassembled, its interior is easily cleaned. The water-cooling wall increases the cooling speed of the rubber sealing strip and improves the curing efficiency.

[0017] Other features and advantages of this invention will be described in detail in the following detailed description section. Attached Figure Description

[0018] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the following detailed description to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0019] Figure 1 This is a schematic diagram of the overall structure from the front end of the rubber seal extrusion molding die;

[0020] Figure 2 This is a side view of the extrusion molding die for rubber seals.

[0021] Figure 3 yes Figure 2 A schematic diagram of the AA cross-sectional structure;

[0022] Figure 4 yes Figure 2 A schematic diagram of the BB cross-sectional structure;

[0023] Figure 5 yes Figure 3 A magnified schematic diagram of a portion of region C in the middle;

[0024] Figure 6 This is a schematic diagram of the overall structure from the rear end of the rubber seal extrusion molding die.

[0025] Explanation of reference numerals in the attached figures

[0026] 1-Outer sleeve; 2-Fixing sleeve; 3-Outer shell; 4-Inner core; 5-Inlet; 6-Outlet; 7-Screw; 8-Flange ring; 9-Flange hole; 10-Insert pipe port; 11-Conical head; 12-Sealing groove; 13-Water stop; 14-Inlet cavity; 15-Neck cavity; 16-Mixing cavity; 17-Beveled surface; 18-Forming cavity; 19-Screw hole; 20-Water cooling cavity. Detailed Implementation

[0027] The specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of this utility model.

[0028] In this utility model, unless otherwise stated, directional terms such as "up, down, left, right, front, back, inside, outside" in the terminology only represent the orientation of the term in its conventional use or are common terms understood by those skilled in the art, and should not be regarded as a limitation on the term.

[0029] See Figure 1-6 The rubber seal extrusion mold shown includes an outer sleeve 1 and an inner core 4. From front to back, an inlet cavity 14, a neck cavity 15, a mixing cavity 16, and multiple circumferentially arranged forming cavities 18 are formed between the outer sleeve 1 and the inner core 4. The cross-sectional area of ​​the inlet cavity 14 decreases sequentially from front to back and communicates with the neck cavity 15. The neck cavity 15 is a straight annular cavity. The front end of the mixing cavity 16 communicates with the neck cavity 15, and its cross-sectional area increases sequentially from front to back. The front end of the forming cavity 18 communicates with the mixing cavity 16, and its rear end communicates with the outside. A fixing sleeve 2 is provided at the rear end of the outer sleeve 1 to be inserted and fitted with the inner core 4. The forming cavity 18 is arranged circumferentially on the inner wall of the fixing sleeve 2. The front end of the fixing sleeve 2 is connected to the inner core 4 by multiple circumferentially arranged screws 7, and a water-cooled wall is provided at the rear end.

[0030] By implementing the above technical solution, when using the rubber seal extrusion molding die, the front end of the outer sleeve 1 of the rubber seal extrusion molding die is installed at the discharge port of the extrusion equipment. The molten raw material sequentially passes through the inlet cavity 14, the neck cavity 15, the mixing cavity 16, and multiple circumferentially arranged molding cavities 18. It is formed at the front end of the molding cavity 18, and the rear end is water-cooled and solidified by the water-cooling wall, and then exits from the end of the molding cavity 18. Since the cross-sectional area of ​​the inlet cavity 14 decreases sequentially from front to back and is connected to the neck cavity 15, the molten raw material is accelerated in the inlet cavity 14 and the neck cavity 15 due to the compression of space. Then it enters the mixing cavity 16, where the pressure is released and disordered mixing occurs, increasing the mixing effect. Finally, it enters the multiple molding cavities 18 and follows the cavity shape of the molding cavity 18 to form the required rubber sealing strip. Among them, the inner wall of the fixing sleeve 2 and the inner core 4 enclose multiple molding cavities 18. When the inner core 4 is disassembled, its interior is easy to clean. The water-cooling wall can increase the cooling speed of the rubber sealing strip and increase the curing efficiency.

[0031] In this embodiment, the fixing sleeve 2 has a radial hole between two adjacent molding cavities 18 for the screw 7 to pass through, and the inner core 4 has a screw hole 19 corresponding to the radial hole on its side. Since the inner wall of the fixing sleeve 2 between the two molding cavities 18 and the outer wall of the inner core 4 are in a fitted relationship, the radial hole and the corresponding screw hole 19 are placed here to avoid the influence of raw material soaking. By screwing multiple screw holes 19 into the screw holes 19, the inner core 4 can be fixed in the middle of the outer sleeve 1.

[0032] In this embodiment, to further provide a water-cooled wall, the water-cooled wall includes an outer shell 3 covering the fixed sleeve 2, a water-cooling cavity 20 is formed between the outer shell 3 and the outer wall of the fixed sleeve 2, a water inlet 5 is provided at the rear end of the outer shell 3, and a water outlet 6 is provided at the front end. Connecting the water outlet 6 and the water inlet 5 to a cooling water circulation device through pipes can accelerate the cooling of the extruded product.

[0033] In this embodiment, the inner core 4 is provided with a conical head 11 at its front end. This design enhances the feeding and dispersion effect of the raw materials.

[0034] In this embodiment, a flange ring 8 is provided at the front end of the outer jacket 1, and flange holes 9 are provided around the flange ring 8. This arrangement allows the outer jacket 1 to be flange-connected to the discharge port of the extrusion equipment.

[0035] In this embodiment, the flange ring 8 has an insertion port 10 at its front end. This design enhances the sealing effect and prevents material from overflowing at the interface.

[0036] In this embodiment, to further enhance the sealing effect, a water-stop 13 is provided on the inner side of the insertion port 10. The water-stop 13 is in contact with the corresponding water-stop surface inside the discharge port of the extrusion equipment, and a sealing ring is provided between the two to enhance the sealing effect.

[0037] In this embodiment, to further enhance the sealing effect, a sealing groove 12 is provided at the front end of the flange ring 8 between the insertion port 10 and the flange hole 9. A sealing gasket is embedded in the sealing groove 12 to seal the connection end face with the extrusion equipment outlet.

[0038] In this embodiment, the inner wall front end of the fixing sleeve 2 is provided with an inclined surface 17. (See reference) Figure 3 As shown, the inner diameter of the fixing sleeve 2 is smaller than the rear diameter of the mixing chamber 16. In order to achieve a better transition effect, the front end of the inner wall of the fixing sleeve 2 is provided with an inclined surface 17, forming an annular cone structure, and the front opening is connected to the mixing chamber 16.

[0039] Taking the production of a T-shaped sealing strip as an example, the molding cavity 18 includes an arc cavity disposed on the outer ring and a radial cavity perpendicular to the arc cavity, and the inner end of the radial cavity is closed by the inner core 4.

[0040] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the specific details of the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the protection scope of the present invention.

[0041] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable way without contradiction. In order to avoid unnecessary repetition, this utility model will not describe the various possible combinations separately.

[0042] Furthermore, various different embodiments of this utility model can be combined in any way, as long as they do not violate the spirit of this utility model, they should also be regarded as the content disclosed by this utility model.

Claims

1. A rubber seal extrusion molding die, characterized in that, The rubber seal extrusion molding die includes an outer sleeve (1) and an inner core (4). An inlet cavity (14), a neck cavity (15), a mixing cavity (16), and a plurality of circumferentially arranged molding cavities (18) are formed between the outer sleeve (1) and the inner core (4) from front to back. The cross-sectional area of ​​the inlet cavity (14) decreases from front to back and communicates with the neck cavity (15). The neck cavity (15) is a straight cylindrical annular cavity. The front end of the mixing cavity (16) communicates with the neck cavity (15), and its cross-sectional area increases from front to back. The front end of the molding cavity (18) communicates with the mixing cavity (16), and its rear end communicates with the outside. A fixing sleeve (2) is provided at the rear end of the outer sleeve (1) to be inserted and fitted with the inner core (4). The molding cavity (18) is arranged along the circumference of the fixing sleeve (2) on its inner wall. The front end of the fixing sleeve (2) is connected to the inner core (4) by a plurality of circumferentially arranged screws (7), and a water-cooled wall is provided at the rear end.

2. The rubber seal extrusion molding die according to claim 1, characterized in that, The fixing sleeve (2) has a radial hole between two adjacent forming cavities (18) for the screw (7) to pass through, and the inner core (4) has a screw hole (19) on its side corresponding to the radial hole.

3. The rubber seal extrusion molding die according to claim 1, characterized in that, The water-cooled wall includes an outer shell (3) covering the outside of the fixed sleeve (2), and a water-cooled cavity (20) is formed between the outer shell (3) and the outer wall of the fixed sleeve (2). The rear end of the outer shell (3) is provided with a water inlet (5) and the front end is provided with a water outlet (6).

4. The rubber seal extrusion molding die according to claim 1, characterized in that, The inner core (4) is provided with a tapered head (11) at its front end.

5. The rubber seal extrusion molding die according to claim 1, characterized in that, The front end of the outer jacket (1) is provided with a flange ring (8), and the flange ring (8) is provided with flange holes (9) around it.

6. The rubber seal extrusion die according to claim 5, characterized in that, The flange ring (8) is provided with an insertion port (10) at its front end.

7. The rubber seal extrusion die according to claim 6, characterized in that, A water stop (13) is provided on the inner side of the insertion port (10).

8. The rubber seal extrusion die according to claim 6, characterized in that, The front end of the flange ring (8) is provided with a sealing groove (12) between the insertion port (10) and the flange hole (9).

9. The rubber seal extrusion die according to claim 1, characterized in that, The inner wall front end of the fixed sleeve (2) is provided with an inclined surface (17).

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