A sealing strip extrusion die

Abstract

The present invention discloses a sealing strip extrusion die, which relates to the technical field of sealing strip production equipment and includes a forming part. One side of the forming part is the input side, and the other side is the output side. The direction from the input side to the output side is the forming direction. A third injection hole and an auxiliary injection hole group are provided on the input side. A first forming hole and an auxiliary forming hole group are provided inside the forming part. A fifth forming hole is provided on the output side. Both ends of the first forming hole are respectively communicated with the third injection hole and the fifth forming hole. The auxiliary injection hole group and the fifth forming hole are respectively communicated with the auxiliary forming hole group. The production of the sealing strip can be realized by one die, which can reduce the input cost of the die, reduce the production process, and improve the production efficiency. At the same time, since each part of the sealing strip is integrally formed in the same die, the shape of the sealing strip and the connection strength of each part of the sealing strip can be guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of production equipment for sealing strips, and particularly to an extrusion die for sealing strips. Background Art

[0002] A sealing strip is a seal for achieving a sealed connection between two or more components. For example, the sealing strip of a car window is used to achieve the seal between the window glass and the window frame. When the window glass moves, it is necessary to ensure a reliable seal between the sealing strip and the glass, as well as between the sealing strip and the window frame.

[0003] Currently, such a sealing strip is usually made of a material with a single hardness. Therefore, when selecting materials, it is necessary to take into account both hardness and connection strength. If the hardness is too high, although the connection strength between the sealing strip and the window frame can be ensured, the sealing performance between the sealing strip and the window glass will be affected, and the resistance during the lifting and lowering of the window glass will also increase. If the hardness is too low, although the sealing performance between the sealing strip and the window glass can be ensured, and the resistance during the lifting and lowering of the window glass can be reduced, the sealing strip is not easy to install due to its low hardness and poor rigidity, and it is also easy to fall off the window frame during use. Thus, there have emerged sealing strips made of two or more different materials, which can achieve a reliable seal between the sealing strip and the window glass and ensure the connection strength between the sealing strip and the window frame.

[0004] Such a sealing strip is usually first formed by using different molds for each material respectively, and then produced by an assembling method. The molds for forming are also multiple, and each part of the sealing strip needs to be formed separately, which will increase the investment cost of the molds, result in high production costs, many production processes, and low production efficiency.

[0005] The patent with the publication number CN110076977A discloses an extrusion die for a car sealing strip, including an extruder connector, a guiding hole, a die connector, a diversion groove, a first die plate, a first mandrel, a screw hole, a positioning hole, a first die feed pipe, a second die structure, a third die structure, a fourth die structure, and a fifth die structure. The setting of the first steel belt mandrel, the steel belt bone, and the second steel belt mandrel in this patent is beneficial to the integration of the steel frame core with the die during the extrusion molding process, effectively controlling the supply amount of the steel belt rubber material, facilitating the adjustment of the forming state of the sealing strip, and greatly reducing the rejection rate. However, it can only be connected to one extruder and is used to produce a sealing strip of one material. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide an extrusion die for a sealing strip, which is used to solve the problems of large investment cost of the die, many production processes, and low production efficiency when the sealing strip is produced with multiple materials.

[0007] To solve the above technical problems, the technical solution adopted by the present invention is as follows:

[0008] A sealing strip extrusion die includes a forming part. One side of the forming part is the input side, and the other side is the output side. The direction from the input side to the output side is the forming direction. A third injection hole and an auxiliary injection hole group are provided on the input side. A first forming hole and an auxiliary forming hole group are provided inside the forming part. A fifth forming hole is provided on the output side. Two ends of the first forming hole are respectively communicated with the third injection hole and the fifth forming hole. The auxiliary injection hole group and the fifth forming hole are respectively communicated with the auxiliary forming hole group.

[0009] By adopting the above technical solution, a sealing strip extrusion die of the present application can realize the production of a sealing strip through a set of dies, which can reduce the input cost of the die, reduce the production process, and improve the production efficiency. At the same time, since the main body and the rest of the sealing strip are integrally formed in the same die, the shape of the sealing strip and the connection strength of each part of the sealing strip can be guaranteed.

[0010] Further, the first forming hole and the auxiliary forming hole group are separated from each other. The auxiliary forming hole group includes a fourth forming hole. One end of the fourth forming hole is communicated with the fifth forming hole. The auxiliary injection hole group includes a second injection hole provided on the input side. The second injection hole is communicated with the other end of the fourth forming hole.

[0011] By adopting the above technical solution, a sealing strip extrusion die of the present application enables different raw materials to form the main body and the rest of the sealing strip through the first forming hole and the fourth forming hole respectively, and then form an integral body in the fifth forming hole, thereby improving the production efficiency and stabilizing the product quality.

[0012] Further, the auxiliary forming hole group includes independent second and third forming holes. The auxiliary injection hole group includes a first injection hole provided on the input side. Two ends of the second forming hole are respectively communicated with the first injection hole and the fifth forming hole. Two ends of the third forming hole are respectively communicated with the first injection hole and the fifth forming hole.

[0013] By adopting the above technical solution, different raw materials are injected into the first forming hole, the second forming hole and the third forming hole of a sealing strip extrusion die of the present application respectively to form the main body and the rest of the sealing strip respectively, and then form an integral body in the fifth forming hole, thereby improving the production efficiency and stabilizing the product quality.

[0014] Further, the first forming hole is used to form the main body of the sealing strip. The shape of the first forming hole corresponds to the shape of the main body. The part of the fifth forming hole corresponding to the clamping part of the sealing strip is communicated with the third injection hole.

[0015] By adopting the above technical solution, an extrusion die for a sealing strip of the present application can respectively form the main body and the clamping part made of the same material, and form them into one body in the fifth forming hole. Since the clamping part and the main body form a corner, this forming method can avoid the phenomenon of material shortage at the joint.

[0016] Further, the second forming hole and the third forming hole are used for forming the sliding part of the sealing strip, and the part of the fifth forming hole corresponding to the sliding part of the sealing strip is communicated with the first injection hole.

[0017] Since the sliding part is serpentine, with bends and corners, by adopting the above technical solution, an extrusion die for a sealing strip of the present application can form the sliding part in three parts separately, which can avoid the phenomenon of material shortage at the corner part, thus ensuring the quality of the product.

[0018] Further, a fourth injection hole is provided on the input side, and the part of the fifth forming hole corresponding to the anti-adhesive layer of the sealing strip is communicated with the fourth injection hole.

[0019] By adopting the above technical solution, an extrusion die for a sealing strip of the present application can form the anti-adhesive layer in the fifth forming hole and integrate it with the rest of the sealing strip, thereby improving production efficiency and stabilizing product quality.

[0020] Further, the forming part includes a first forming sheet, a second forming sheet, a third forming sheet and a fourth forming sheet stacked in sequence along the forming direction. The input side is the side of the first forming sheet away from the second forming sheet, and the output side is the side of the fourth forming sheet away from the second forming sheet. The first forming hole penetrates through the second forming sheet and the third forming sheet, the fifth forming hole is penetrated and arranged on the fourth forming sheet, a second flow channel is provided on the surface of the first forming sheet close to the second forming sheet, the second injection hole penetrates through the first forming sheet, the second forming sheet and the third forming sheet, one end of the second flow channel is communicated with the third injection hole, and the other end is communicated with one end of the first forming hole close to the first forming sheet; the fourth forming hole is penetrated and arranged on the third forming sheet, a fourth flow channel is provided on the surface of the second forming sheet close to the third forming sheet, one end of the fourth flow channel is communicated with the second injection hole, and the other end is communicated with one end of the fourth forming hole close to the second forming sheet.

[0021] By adopting the above technical solution, the forming part of an extrusion die for a sealing strip of the present application is divided into four sheets, thereby reducing the manufacturing difficulty of the die, making the die easier to process and manufacture, and also facilitating subsequent maintenance and repair.

[0022] Further, there are three mutually independent fourth forming holes, and there are three fourth flow channels. The three fourth flow channels are respectively communicated with one end of the three fourth forming holes, and the other ends of the three fourth flow channels are respectively communicated with first material passing holes. The first material passing holes respectively penetrate through the first forming sheet and the second forming sheet, and the first material passing holes are all communicated with the second injection holes.

[0023] By adopting the above technical solution, a sealing strip extrusion die of the present application can simultaneously form three lips of the sealing strip, so that the hardness and elasticity of the three lips are kept consistent.

[0024] Further, a feeding die table covers the input side of the first forming sheet. The second injection hole and the third injection hole both penetrate through the feeding die table. Three diversion channels are arranged on one side of the feeding die table close to the first forming sheet. One ends of the three diversion channels are all communicated with the second injection hole, and the other ends of the three diversion channels are respectively communicated with the three first material passing holes.

[0025] By adopting the above technical solution, a sealing strip extrusion die of the present application can simultaneously divide the raw materials injected from one second injection hole into three paths, and then respectively flow into the three material passing holes, so that the pressures of the three paths of raw materials are kept consistent, and further the hardness and elasticity of the three lips formed subsequently are kept consistent.

[0026] Further, the forming part includes a first forming sheet, a second forming sheet, a third forming sheet and a fourth forming sheet stacked in sequence along the forming direction. The input side is the side of the first forming sheet away from the second forming sheet. The first forming hole penetrates through the second forming sheet and the third forming sheet. The fifth forming hole is penetrated and arranged on the fourth forming sheet. The first injection hole penetrates through the first forming sheet, the second forming sheet and the third forming sheet. The second forming hole and the third forming hole are both penetrated and arranged on the third forming sheet; a second material passing hole is penetrated and arranged on the second forming sheet, and the second material passing hole is communicated with the third forming hole; a first flow channel is arranged on one side of the first forming sheet close to the second forming sheet, one end of the first flow channel is communicated with the first injection hole, and the other end is communicated with the second material passing hole; a third flow channel is arranged on one side of the second forming sheet close to the third forming sheet, one end of the third flow channel is communicated with the second forming hole, and the other end is communicated with the first injection hole; a seventh flow channel is arranged on one side of the third forming sheet close to the fourth forming sheet, one end of the seventh flow channel is communicated with the first injection hole, and the part of the fifth forming hole corresponding to the sliding part of the sealing strip is communicated with the other end of the seventh flow channel.

[0027] By adopting the above technical solution, the forming part of a sealing strip extrusion die of the present application has four sheets respectively, thereby reducing the manufacturing difficulty of the die, making the die easier to process and manufacture, and also facilitating subsequent maintenance and repair.

[0028] Furthermore, a fifth forming sheet is fixedly connected to the output side of the forming part. A first product extrusion hole is provided through the fifth forming sheet. The first product extrusion hole communicates with a fifth forming hole. A twelfth flow channel is provided on the surface of the fifth forming sheet close to the forming part. The part of the first product extrusion hole corresponding to the friction layer of the sealing strip communicates with the edge of the twelfth flow channel. A communication hole communicating with the twelfth flow channel is provided on the fifth forming sheet. A heating mechanism is provided on the fifth forming sheet. A heat insulation structure is provided between the fifth forming sheet and the forming part.

[0029] By adopting the above technical solution, a sealing strip extrusion die of the present application can form the friction layer on the sliding part of the sealing strip with a plastic material. Since the extrusion temperature of the rubber material is 70 - 100 degrees Celsius, if the temperature of the rubber material is higher than 100 degrees Celsius, the rubber will be vulcanized prematurely (cooked), resulting in particles on the surface of the product, thus affecting the product quality. And the forming temperature of the plastic is 220 °C. If the temperature is too low, the plastic will be difficult to form. The heat insulation structure can reduce the temperature influence of the heating die table on the forming part during heating, thereby ensuring the smooth forming of the sealing strip.

[0030] Furthermore, the heating mechanism is a heating die table fixedly arranged on the surface of the fifth forming sheet away from the forming part. A heating rod is inserted into the heating die table. The heating die table is provided with a finished product export hole at a position corresponding to the first product extrusion hole. An eleventh flow channel with one end connected to the communication hole is provided on the surface of the fifth forming sheet close to the heating die table. A fifth injection hole communicating with the other end of the eleventh flow channel is provided on the heating die table.

[0031] By adopting the above technical solution, a sealing strip extrusion die of the present application can introduce the plastic extruded by the plastic extruder into the fifth forming sheet and ensure its temperature during the flow of the plastic.

[0032] Furthermore, a first boss is fixedly arranged on the surface of the heating die table away from the forming part. The first boss is close to the part of the first product extrusion hole corresponding to the friction layer of the sealing strip. The heating rod is inserted into the first boss.

[0033] By adopting the above technical solution, a sealing strip extrusion die of the present application can not only ensure the temperature during the formation of the friction layer, but also reduce the temperature influence on the rubber material of the sealing strip.

[0034] Furthermore, the edge of the twelfth flow channel is a flange lower than the surface of the fifth forming sheet close to the forming part. The part of the first product extrusion hole corresponding to the friction layer of the sealing strip corresponds to the flange. The friction layer is serpentine. A protrusion is provided at the position of the flange corresponding to the corner of the friction layer. The surface of the fifth forming sheet close to the forming part is flush with the end face of the protrusion. The protrusion protrudes into the first product extrusion hole.

[0035] By adopting the above technical solution, a sealing strip forming die of the present application can divide the friction layer of the formed sealing strip into three non-connected sections, which can ensure the smooth bending of the sealing strip when installed on an automobile and ensure reliable contact between the friction layer and the slider on the window glass. In addition, the flange can thin the formed sliding part at the corner, which is beneficial to the bending of the sliding part and makes it easier for the sealing strip to cooperate with the window frame of the automobile. At the same time, when the sliding part is bent, it can also ensure that the connecting part between the sliding part and the friction layer has a certain stiffness.

[0036] Further, the heat insulation structure is a second boss fixedly arranged on one side of the fifth forming piece close to the forming part. The second boss abuts against the output side of the forming part, and the first product extrusion hole penetrates through the second boss.

[0037] By adopting the above technical solution, a sealing strip forming die of the present application makes the fifth forming piece in a hollow shape, reduces the heat transfer between the fifth forming piece and the fourth forming piece, ensures that the temperature of the forming part will not be too high, and further ensures that the rubber materials injected into the first injection hole, the second injection hole, the third injection hole and the fourth injection hole will not be vulcanized in advance in the forming part.

[0038] Further, a wire feeding hole is provided on the input side of the forming part. A wire feeding rod is fixedly connected in the wire feeding hole. The wire feeding rod is provided with a through hole along its axial direction, and the inner end of the wire feeding rod extends into the first forming hole.

[0039] By adopting the above technical solution, a sealing strip forming die of the present application can implant fiber filaments into the sealing strip, thereby increasing the tensile strength of the sealing strip.

[0040] The positive effects of the present invention are as follows:

[0041] 1. The present invention is provided with a forming part, and the forming part is provided with a first injection hole, a second injection hole, a third injection hole and a fourth injection hole, which are used to be connected to four extruders respectively and inject different rubber materials. The materials output by the four extruders form each part of the sealing strip separately in the die, and then are fused into one body in the fifth forming hole on the forming part, thereby forming the sealing strip. Therefore, the production of the sealing strip can be realized by one die, which can reduce the investment cost of the die, reduce the production process and improve the production efficiency. At the same time, since each part of the sealing strip is integrally formed in the same die, the shape of the sealing strip and the connection strength of each part of the sealing strip can be ensured.

[0042] 2. A fifth forming sheet and a heating die table are provided on one side of the forming part. A fifth injection hole connected to the plastic extruder is provided on the heating die table, and a heat insulation structure is provided on the fifth forming sheet. The molten plastic is injected from the fifth injection hole. After the sealing strip is formed through the fifth forming hole, it passes through the fifth forming sheet. At this time, the molten plastic is coated on the sealing strip, thereby forming a fish-scale-shaped friction layer. The friction layer is made of plastic and has a fish-scale-shaped surface, with a low friction coefficient, which can reduce the resistance when the parts in frictional cooperation with it move. Since the extrusion temperature of the rubber material is 70 - 100 degrees, if the temperature is higher than 100 degrees, the rubber will be prematurely vulcanized (cooked), resulting in particles on the surface of the sealing strip finished product, thus affecting the product quality. And the forming temperature of the plastic is 220°C. If the temperature is too low, the plastic will be difficult to form. The heating die table is arranged on the outermost side, so as to minimize the temperature influence of the heating die table on the forming part during heating, thus ensuring the smooth forming of the sealing strip. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 is a perspective view of the present invention;

[0044] Figure 2 is Figure 1 the left side view of

[0045] Figure 3 is Figure 1 the right side view of

[0046] Figure 4 is Figure 1 the exploded Figure 1 ;

[0047] Figure 5 is Figure 1 the exploded Figure 2 ;

[0048] Figure 6 is Figure 5 the schematic diagram of the feeding die table after removing the lower cover plate in

[0049] Figure 7 is Figure 4 the partial enlarged view of part I in

[0050] Figure 8 is Figure 4 the partial enlarged view of part II in

[0051] Figure 9 is Figure 4 the partial enlarged view of part III in

[0052] Figure 10 is Figure 5 the partial enlarged view of part IV in

[0053] Figure 11 is Figure 5Partial enlarged view of part V;

[0054] Figure 12 is Figure 5 Partial enlarged view of part VI;

[0055] Figure 13 is the cross-sectional view of the sealing strip;

[0056] Figure 14 is the cross-sectional view of the auxiliary sealing strip;

[0057] In the figure:

[0058] 1. Feeding die table; 2. Forming part; 3. Heating die table; 4. Heating rod installation hole; 5. Fifth injection hole; 6. First boss; 7. Installation hole; 8. First injection hole; 9. Wire feeding hole; 10. Fourth injection hole; 11. Third injection hole; 12. Second injection hole; 13. First product extrusion hole; 14. Wire feeding rod; 15. Lip; 16. Anti-sticking layer; 17. Friction layer; 18. Sliding part; 19. Fiber filament; 20. Auxiliary sealing strip; 21. Clamping part; 22. First forming piece; 23. Second forming piece; 24. Main body; 25. Third forming piece; 26. Fourth forming piece; 27. Fifth forming piece; 28. Finished product outlet hole; 29. Second product extrusion hole; 30. First material passing hole; 31. Second material passing hole; 32. First forming hole; 33. Second forming hole; 34. Third forming hole; 35. Fourth forming hole; 36. Protrusion; 37. Fifth forming hole; 38. Twelfth runner; 39. Second boss; 40. Notch; 41. Cover plate; 42. First runner; 43. Second runner; 44. Third runner; 45. Fourth runner; 46. Fifth runner; 47. Seventh runner; 48. Eighth runner; 49. Ninth runner; 50. Tenth runner; 51. Flow guiding groove; 52. Eleventh runner; 53. Communication hole; 54. Flange. Detailed implementation mode

[0059] Example 1

[0060] Figure 13Shown is a sealing strip used on the car window, which is composed of a main body 24, a sliding part 18, a clamping part 21, two anti-sticking layers 16 and four lips 15. The sliding part 18 is serpentine. The sliding part 18 is connected to the right side of one end of the main body 24. Among them, two lips 15 are respectively connected to the other end of the main body 24 and near the other end, with the direction to the right. The third lip 15 is connected to one end of the main body 24 on the left side near the sliding part 18, and the fourth lip 15 is connected to the right end of the sliding part 18. The clamping part 21 is connected to the left side of the main body 24. The main body 24 and the clamping part 21 are made of the same kind of rubber material with a relatively high hardness, and its hardness is at Sha = 80 ± 5°. The rubber materials used for the sliding part 18, the two anti-sticking layers 16 and the four lips 15 have a lower hardness than the material hardness of the main body 24.

[0061] As Figures 1 to 5 shown, a sealing strip extrusion die includes a cylindrical forming part 2. The left side of the forming part 2 is the input side, and the right side is the output side. The direction from the input side to the output side is the forming direction (i.e., the direction from left to right). The input side is provided with a third injection hole 11 and an auxiliary injection hole group. The forming part 2 is provided with a first forming hole 32 and an auxiliary forming hole group. The output side is provided with a fifth forming hole 37. The two ends of the first forming hole 32 are respectively communicated with the third injection hole 11 and the fifth forming hole 37. The auxiliary injection hole group and the fifth forming hole 37 are respectively communicated with the auxiliary forming hole group. The shape of the fifth forming hole 37 corresponds to the shape of the sealing strip, and the shape of the first forming hole 32 corresponds to the shape of the main body 24. The first forming hole 32 is used for forming the main body 24.

[0062] The third injection hole 11 and the auxiliary injection hole group are respectively connected to different rubber extruders. One kind of raw material enters the first forming hole 32 from the third injection hole 11 to form the shape of the main body 24. At the same time, the remaining raw materials enter the auxiliary forming hole group from the auxiliary injection hole group to form the remaining parts of the sealing strip (i.e., the sliding part 18, the clamping part 21, the two anti-sticking layers 16 and the four lips 15), and then are extruded together from the fifth forming hole 37 to form the sealing strip.

[0063] Since the production of this sealing strip can be realized by one kind of die, the input cost of the die can be reduced, the production process can be reduced, and the production efficiency can be improved. At the same time, since the main body 24 of the sealing strip and the remaining parts are integrally formed in the same die, the shape of the sealing strip and the connection strength of each part of the sealing strip can be guaranteed.

[0064] Embodiment 2

[0065] Combined with Figures 6 to 12 shown, the difference between this embodiment and Embodiment 1 is that:

[0066] The first forming hole 32 and the auxiliary forming hole group are separated from each other. The auxiliary forming hole group includes three mutually separated fourth forming holes 35, and the shapes of the three fourth forming holes 35 respectively correspond to the shapes of the three lips 15 on the same side of the sealing strip. The right ends of the three fourth forming holes 35 are respectively communicated with a fifth forming hole 37, and the auxiliary injection hole group includes a second injection hole 12 arranged on the input side. The left ends of the three fourth forming holes 35 are respectively communicated with the second injection hole 12. The part of the fifth forming hole 37 corresponding to the fourth lip 15 is communicated with the second injection hole 12.

[0067] The auxiliary forming hole group further includes an independent second forming hole 33 and a third forming hole 34. The shape of the second forming hole 33 corresponds to the shape of the middle part of the sliding part 18, and the shape of the third forming hole 34 corresponds to the shape of the part of the sliding part 18 close to the lip 15. The auxiliary injection hole group includes a first injection hole 8 arranged on the input side. The two ends of the second forming hole 33 are respectively communicated with the first injection hole 8 and the fifth forming hole 37, and the two ends of the third forming hole 34 are respectively communicated with the first injection hole 8 and the fifth forming hole 37. The part of the fifth forming hole 37 corresponding to the clamping part 21 is communicated with the third injection hole 11.

[0068] The second forming hole 33 and the third forming hole 34 are used for forming the middle part of the sliding part 18 and the part of the sliding part 18 close to the lip 15. The part of the fifth forming hole 37 corresponding to the sliding part 18 of the sealing strip is communicated with the first injection hole 8.

[0069] A fourth injection hole 10 is arranged on the input side. The part of the fifth forming hole 37 corresponding to the anti-sticking layer 16 is communicated with the fourth injection hole 10. The first injection hole 8, the second injection hole 12, the third injection hole 11 and the fourth injection hole 10 are respectively used for injecting different rubber materials.

[0070] Specifically, the forming part 2 includes a first forming sheet 22, a second forming sheet 23, a third forming sheet 25 and a fourth forming sheet 26 stacked in sequence from left to right. The first forming sheet 22, the second forming sheet 23, the third forming sheet 25 and the fourth forming sheet 26 are all disc-shaped. The input side is the left side of the first forming sheet 22, and the output side is the right side of the fourth forming sheet 26.

[0071] A disc-shaped feeding die table 1 is arranged on the left side of the first forming sheet 22. Mounting holes 7 are provided on the feeding die table 1, the first forming sheet 22, the second forming sheet 23, the third forming sheet 25 and the fourth forming sheet 26, and they are fixedly connected to each other by screws passing through the mounting holes 7. To avoid misunderstanding, Figures 4 to 12 the mounting holes 7 are all hidden in the figures. Notches 40 for alignment are provided on the edges of the feeding die table 1, the first forming sheet 22, the second forming sheet 23 and the third forming sheet 25.

[0072] Viewed from the left side of the feeding die table 1, starting from the upper part of the feeding die table 1, the first injection hole 8, the second injection hole 12, the third injection hole 11, and the fourth injection hole 10 are arranged in counterclockwise order. The first injection hole 8, the second injection hole 12, the third injection hole 11, and the fourth injection hole 10 all penetrate through the feeding die table 1, the first forming piece 22, the second forming piece 23, and the third forming piece 25.

[0073] The first forming hole 32 penetrates through the second forming piece 23 and the third forming piece 25. The fifth forming hole 37 is arranged through the fourth forming piece 26. The lower part of the right side of the first forming piece 22 is provided with a second flow channel 43. The lower end of the second flow channel 43 is communicated with the third injection hole 11, and the upper end is communicated with the left end of the first forming hole 32. The lower part of the right side of the third forming piece 25 is provided with a tenth flow channel 50. The lower end of the tenth flow channel 50 is communicated with the third injection hole 11. The part of the fifth forming hole 37 corresponding to the clamping part 21 is communicated with the upper end of the tenth flow channel 50.

[0074] The main body 24 and the clamping part 21 are formed by the same rubber material injected from the third injection hole 11. The forming process is as follows:

[0075] The rubber material coming out of the extruder is injected from the third injection hole 11 on the left side of the feeding die table 1 and flows to the right. A part of it enters the left end of the first forming hole 32 on the second forming piece 23 through the second flow channel 43, then flows through the third forming piece 25 and enters the fifth forming hole 37. A part of it enters the fifth forming hole 37 through the tenth flow channel 50 and is divided into two strands to form the clamping part 21, and fuses with the main body 24 formed in the first forming hole 32 in the fifth forming hole 37.

[0076] Since the main body 24 is relatively narrow and the clamping part 21 is hook-shaped and connected to the main body 24, by forming the main body 24 and the clamping part 21 separately and then fusing them into one body in the fifth forming hole 37, it can avoid the difficulty of filling the cavity due to poor rubber fluidity, which may cause defects on the sealing strip or even scrapping of the sealing strip. Since the clamping part 21 is hook-shaped, to ensure no material shortage, the clamping part 21 is formed by the tenth flow channel 50 divided into two strands, so as to ensure that the material fills the part of the fifth forming hole 37 corresponding to the clamping part 21 and avoid material shortage or air bubbles in the produced sealing strip.

[0077] Three fourth forming holes 35 are arranged through the third forming piece 25. The right side of the second forming piece 23 is provided with three independent fourth flow channels 45. The outer ends of the three fourth flow channels 45 are all communicated with the second injection hole 12, and the inner ends are respectively communicated with the left ends of the corresponding fourth forming holes 35.

[0078] Three mutually independent first material passing holes 30 are provided through the first forming piece 22, and the three first material passing holes 30 penetrate through the second forming piece 23. The three fourth flow channels 45 correspond to the three first material passing holes 30 one by one. The outer ends of the three fourth flow channels 45 are respectively communicated with the corresponding first material passing holes 30, and the three first material passing holes 30 are all communicated with the second injection hole 12.

[0079] A concave pit is provided on the right side of the feeding die table 1. Three diversion channels 51 are provided in the concave pit. A cover plate 41 is fixedly connected to the concave pit through screws, and the three first material passing holes 30 all penetrate through the cover plate 41. One ends of the three diversion channels 51 are all communicated with the second injection hole 12, and the other ends are respectively communicated with the three first material passing holes 30.

[0080] A ninth flow channel 49 is provided on the right side of the third forming piece 25. The outer end of the ninth flow channel 49 is communicated with the second injection hole 12, and the part of the fifth forming hole 37 corresponding to another lip 15 (i.e., the lip 15 on the same side of the main body 24 as the clamping portion 21) is communicated with the inner end of the ninth flow channel 49.

[0081] The four lips 15 are formed by using the same rubber material injected from the second injection hole 12. The forming process is as follows:

[0082] After the rubber material coming out of the extruder is injected from the second injection hole 12, a part of the rubber material is divided into three paths through the three diversion channels 51, respectively passes through the three first material passing holes 30, and then enters the three fourth forming holes 35 on the third forming piece 25 through the three fourth flow channels 45. After that, it enters the fifth forming hole 37 and fuses with the part corresponding to the rubber strip to form three lips 15 on the same side of the main body 24. Another part of the rubber material flows into the fifth forming hole 37 through the ninth flow channel 49 to form the fourth lip 15 on the other side of the main body 24 and fuses with the main body 24.

[0083] Since the four lips 15 are located on both sides of the main body 24, by arranging the three diversion channels 51 to cross the first forming hole 32, the forming of the four lips 15 is realized. The rubber material simultaneously forms the three lips 15 on the same side through three parallel paths, which can ensure the same pressure during the forming in the fourth forming hole 35 and avoid the phenomenon of material shortage.

[0084] The second forming hole 33 and the third forming hole 34 are both provided through the third forming piece 25. A second material passing hole 31 is provided through the second forming piece 23. The right end of the second material passing hole 31 is communicated with the left end of the third forming hole 34. On the right side of the first forming piece 22, a first flow channel 42 is provided at its upper part. The outer end of the first flow channel 42 is communicated with the first injection hole 8, and the inner end is communicated with the left end of the second material passing hole 31.

[0085] On the right side of the second forming sheet 23, a third runner 44 is provided at its upper part. The upper end of the third runner 44 communicates with the first injection hole 8, and the lower end of the third runner 44 communicates with the left end of the second forming hole 33. On the right side of the third forming sheet 25, a seventh runner 47 is provided at its upper part. The upper end of the seventh runner 47 communicates with the first injection hole 8. The part of the sliding portion 18 close to the main body 24 is a connecting portion, and the position corresponding to the fifth forming hole 37 of this connecting portion communicates with the lower end of the seventh runner 47.

[0086] The sliding portion 18 is formed by using the same rubber material injected from the first injection hole 8. The forming process is as follows:

[0087] After the rubber material coming out of the extruder is injected from the first injection hole 8, a part of it flows into the third forming hole 34 after passing through the first runner 42 and the second material passing hole 31, and forms the part of the sliding portion 18 close to the lip portion 15. A part of the rubber material flows into the second forming hole 33 after passing through the third runner 44 and forms the middle part of the sliding portion 18. Then they jointly enter the fifth forming hole 37. Another part of the rubber material enters the fifth forming hole 37 through the seventh runner 47, jointly forms the sliding portion 18, and fuses with the main body 24.

[0088] Since the sliding portion 18 is serpentine and has turns and corners. Dividing the sliding portion 18 into three parts for forming can avoid the phenomenon of material shortage at the corner parts, thus ensuring the quality of the product.

[0089] On the right side of the third forming sheet 25, two eighth runners 48 are also provided. The outer ends of the two eighth runners 48 both communicate with the fourth injection hole 10. The two eighth runners 48 correspond to the two anti - sticking layers 16 of the sealing strip one by one. The parts of the fifth forming hole 37 corresponding to the anti - sticking layers 16 communicate with the inner ends of the corresponding eighth runners 48 respectively.

[0090] The rubber material coming out of the extruder enters the fourth injection hole 10, and then flows to the parts corresponding to the anti - sticking layers 16 at the edges of the fifth forming hole 37 after passing through the two eighth runners 48, and forms the two anti - sticking layers 16. The anti - sticking layers 16 play the roles of beauty and preventing adhesion.

[0091] One fiber filament 19 is provided in each of the main body 24 and the sliding portion 18 of the sealing strip to increase the tensile strength of the sealing strip. On the left side of the feeding die table 1, two wire feeding holes 9 are provided. A wire feeding rod 14 is fixedly connected in the wire feeding hole 9 by threads. A through hole is provided in the wire feeding rod 14 along its axial direction through the wire feeding hole 9. The inner end of one wire feeding rod 14 extends into the first forming hole 32, and the inner end of the other wire feeding rod 14 extends into the second forming hole 33.

[0092] The fiber filament 19 passes through the feeding screw rod 14. When the sliding part 18 and the main body 24 are being formed, during the flow of the rubber material from left to right, the fiber filament 19 will be driven to the right, so that the fiber filament 19 is buried in the sealing strip to increase the tensile strength of the sealing strip.

[0093] Embodiment 3

[0094] The difference between this embodiment and Embodiment 2 lies in that:

[0095] A friction layer 17 is provided on the inner side of the sliding part 18, and a friction layer 17 is also provided on the part of the main body 24 close to the sliding part 18.

[0096] On the right side of the fourth forming piece 26, a disc-shaped fifth forming piece 27 is fixedly connected by screws. A first product extrusion hole 13 having a shape consistent with that of the sealing strip is provided through the fifth forming piece 27. The first product extrusion hole 13 communicates with the fifth forming hole 37. On the left side of the fifth forming piece 27, a twelfth flow channel 38 is provided. The part of the first product extrusion hole 13 corresponding to the friction layer 17 communicates with the edge of the twelfth flow channel 38. A communication hole 53 communicating with the twelfth flow channel 38 is provided through the fifth forming piece 27. A heating mechanism is provided on the fifth forming piece 27, and a heat insulation structure is provided between the fifth forming piece 27 and the forming part 2.

[0097] The heating mechanism is a disc-shaped heating die table 3 fixedly arranged on the right side of the fifth forming piece 27. A heating rod is inserted into the heating die table 3. The heating die table 3 is provided with a finished product outlet hole 28 at a position corresponding to the first product extrusion hole 13, and the size of the finished product outlet hole 28 is larger than the external size of the first product extrusion hole 13. On the right side of the fifth forming piece 27, an eleventh flow channel 52 with its inner end communicating with the communication hole 53 is provided. The heating die table 3 is provided with a fifth injection hole 5 communicating with the outer end of the eleventh flow channel 52.

[0098] A first boss 6 is fixedly arranged on the right side of the heating die table 3, and the first boss 6 is close to the part of the first product extrusion hole 13 corresponding to the friction layer 17. The heating rod is inserted into the heating rod mounting hole 4 on the first boss 6, and the fifth injection hole 5 penetrates through the first boss 6.

[0099] The molten plastic is injected from the right end of the fifth injection hole 5 of the first boss 6, and then successively passes through the eleventh flow channel 52, the communication hole 53 and the twelfth flow channel 38 and flows out from the edge of the twelfth flow channel 38. After the sealing strip is formed through the fifth forming hole 37, it passes through the first product extrusion hole 13. At this time, the molten plastic in the twelfth flow channel 38 is coated on the sealing strip, thereby forming a fish-scale-shaped friction layer 17.

[0100] The friction layer 17 is made of plastic material, and the forming temperature is 220 °C. If the temperature is too low, it will be difficult to form. Its friction coefficient is low, which can reduce the resistance when the parts in frictional cooperation with it move. Since the extrusion temperature of the rubber material is 70 - 100 degrees, and if it is higher than 100 degrees, the rubber will be prematurely vulcanized (clinker), resulting in particles on the surface of the product, thus affecting the product quality. The fifth forming piece 27 is arranged on the right side of the fourth forming piece 26, and the heating die table 3 is arranged on the right side of the fifth forming piece 27, so as to minimize the temperature influence of the heating die table 3 on the first forming piece 22, the second forming piece 23, the third forming piece 25 and the fourth forming piece 26 on the left side of the fifth forming piece 27 during heating, thus ensuring the smooth forming of the sealing strip.

[0101] Since the first boss 6 equipped with a heating rod is close to the part corresponding to the first product extrusion hole 13 and the friction layer 17, and the size of the finished product export hole 28 is larger than the external size of the first product extrusion hole 13, the sealing strip coming out of the first product extrusion hole 13 will not contact the heating die table 3. Thus, it can not only ensure the temperature during the forming of the friction layer 17, but also reduce the influence on the rubber material of the sealing strip.

[0102] The edge of the twelfth runner 38 is a flange 54 lower than the side of the fifth forming piece 27 close to the forming part 2. The part of the first product extrusion hole 13 corresponding to the friction layer 17 of the sealing strip corresponds to the flange 54. The friction layer 17 is serpentine, and there are two protrusions 36 at the positions of the flange 54 corresponding to the corners of the friction layer 17. The side of the fifth forming piece 27 close to the forming part 2 is flush with the end face of the protrusion 36, and the protrusion 36 protrudes into the first product extrusion hole 13.

[0103] Therefore, after the friction layer 17 is formed, it will form three non - connected sections on the main body 24 and the sliding part 18. Since the hardness of plastic is higher than that of rubber, and the sealing strip needs to be bent during installation. After the friction layer 17 is separated into three non - connected sections by the two flanges 54, it can not only ensure the smooth bending of the sealing strip, but also ensure the reliable contact between the friction layer 17 and the slider on the vehicle window glass. In addition, the flange 54 can make the formed sliding part 18 thinner at the corner, which is beneficial to the bending of the sliding part 18 and makes it easier for the sealing strip to cooperate with the vehicle window frame. When the sliding part 18 is bent, it can also ensure that the connecting part between the sliding part 18 and the friction layer 17 has a certain rigidity.

[0104] The heat insulation structure is the second boss 39 fixedly arranged on the side of the fifth forming piece 27 close to the forming part 2. The second boss 39 abuts against the right side of the fourth forming piece 26, and the first product extrusion hole 13 penetrates through the second boss 39.

[0105] On the left side of the fifth forming piece 27, there is an installation hole boss along its circumferential direction, and installation holes are drilled on the installation hole boss. The installation holes penetrate through the heating die table 3 (to avoid misunderstanding, Figure 4 、Figure 5 and Figure 9 (The mounting holes in the middle figure are hidden).

[0106] By setting up the heat insulation structure, the heat transfer between the fifth forming sheet 27 and the fourth forming sheet 26 can be further reduced. This can not only ensure the temperature during the forming of the friction layer 17, but also further reduce the temperature influence on the first forming sheet 22, the second forming sheet 23, the third forming sheet 25 and the fourth forming sheet 26.

[0107] Beside the first forming hole 32 of the third forming sheet 25, there is a second product extrusion hole 29. The second product extrusion hole 29 runs through the fourth forming sheet 26 and the fifth forming sheet 27 successively to the right. On the right side of the second forming sheet 23, there is a fifth runner 46. The outer end of the fifth runner 46 is connected to the third injection hole 11, and the inner end is connected to the left end of the second product extrusion hole 29 on the third forming sheet 25.

[0108] The rubber material in the third injection hole 11 flows into the second product extrusion hole 29 through the fifth runner 46, forming a sub-sealing strip 20 with an X-shaped cross-section as shown in Figure 14 . Thus, two kinds of sealing strips can be produced simultaneously by one set of molds, improving the production efficiency and reducing the input cost of the molds. After the sub-sealing strip 20 is extruded from the second product extrusion hole 29, it passes through the finished product export hole 28.

[0109] In actual production, the material injected through the first injection hole 8 is EPDM903, the material injected through the second injection hole 12 is SS95 rubber lubricant, the material injected through the third injection hole 11 is EPDM851, the material injected through the fourth injection hole 10 is EPDM603, and the material injected through the fifth injection hole 5 is PER lubricant.

[0110] The fifth forming sheet 27 is in a hollow shape and is connected to the heating die table 3. The heat of the heating die table 3 can be directly transferred to the fifth forming sheet 27, ensuring the vulcanization temperature of the PER lubricant. A hollow is formed at the joint position of the fifth forming sheet 27 and the fourth forming sheet 16, reducing the contact area between the fifth forming sheet 27 and the fourth forming sheet 16. Thus, the heat transfer between the fifth forming sheet 27 and the fourth forming sheet 16 can be reduced, ensuring that the temperature of the forming part 2 will not be too high and that the rubber materials injected through the first injection hole 8, the second injection hole 12, the third injection hole 11 and the fourth injection hole 10 will not be vulcanized in advance within the forming part 2.

[0111] The above embodiments are described in detail and specifically, representing the preferred embodiments of the present invention. They are only used to illustrate the technical ideas and features of the present invention. The purpose is to enable those skilled in the art to understand the content of the present invention and implement it accordingly. However, it is not limited to the present invention only. The patent scope of the present invention cannot be limited solely by this embodiment. That is, any equivalent changes or modifications made in accordance with the spirit disclosed by the present invention, for researchers or technicians in the field, within the structure of the present invention, local improvements within the system and changes and transformations between subsystems are still within the patent scope of the present invention.

Claims

1. A sealing strip extrusion die, characterized in that: It includes a forming part (2). One side of the forming part (2) is the input side, and the other side is the output side. The direction from the input side to the output side is the forming direction. A third injection hole (11) and an auxiliary injection hole group are provided on the input side. A first forming hole (32) and an auxiliary forming hole group are provided inside the forming part (2). A fifth forming hole (37) is provided on the output side. The two ends of the first forming hole (32) are respectively communicated with the third injection hole (11) and the fifth forming hole (37). The auxiliary injection hole group and the fifth forming hole (37) are respectively communicated with the auxiliary forming hole group; the first forming hole (32) and the auxiliary forming hole group are separated from each other. The auxiliary forming hole group includes a fourth forming hole (35) for forming the lip part (15) of the sealing strip. One end of the fourth forming hole (35) is communicated with the fifth forming hole (37). The auxiliary injection hole group includes a second injection hole (12) provided on the input side. The second injection hole (12) is communicated with the other end of the fourth forming hole (35); the first forming hole (32) is used for forming the main body (24) of the sealing strip. The shape of the first forming hole (22) corresponds to the shape of the main body (24). The part of the fifth forming hole (37) corresponding to the clamping part (21) of the sealing strip is communicated with the third injection hole (11); a fourth injection hole (10) is also provided on the input side. The part of the fifth forming hole (37) corresponding to the anti-sticking layer (16) of the sealing strip is communicated with the fourth injection hole (10); the auxiliary forming hole group includes independent second forming hole (33) and third forming hole (34). The auxiliary injection hole group includes a first injection hole (8) provided on the input side. The two ends of the second forming hole (33) are respectively communicated with the first injection hole (8) and the fifth forming hole (37). The two ends of the third forming hole (34) are respectively communicated with the first injection hole (8) and the fifth forming hole (37); the second forming hole (33) and the third forming hole (34) are used for forming the sliding part (18) of the sealing strip. The part of the fifth forming hole (37) corresponding to the sliding part (18) of the sealing strip is communicated with the first injection hole (8); A fifth forming sheet (27) is fixedly connected to the output side of the forming part (2). A first product extrusion hole (13) is provided through the fifth forming sheet (27). The first product extrusion hole (13) is communicated with a fifth forming hole (37). A twelfth flow channel (38) is provided on the surface of the fifth forming sheet (27) close to the forming part (2). The part of the first product extrusion hole (13) corresponding to the friction layer (17) of the sealing strip is communicated with the edge of the twelfth flow channel (38). A communication hole (53) communicated with the twelfth flow channel (38) is provided on the fifth forming sheet (27). A heating mechanism is provided on the fifth forming sheet (27). A heat insulation structure is provided between the fifth forming sheet (27) and the forming part (2); the heating mechanism is a heating die table (3) fixedly arranged on the surface of the fifth forming sheet (27) away from the forming part (2). Heating rods are inserted into the heating die table (3). A finished product export hole (28) is provided on the heating die table (3) at a position corresponding to the first product extrusion hole (13). An eleventh flow channel (52) with one end connected to the communication hole (53) is provided on the surface of the fifth forming sheet (27) close to the heating die table (3). A fifth injection hole (5) communicated with the other end of the eleventh flow channel (52) is provided on the heating die table (3).

2. The extruding die for a sealing strip according to claim 1, wherein: The forming part (2) includes a first forming sheet (22), a second forming sheet (23), a third forming sheet (25) and a fourth forming sheet (26) stacked in sequence along the forming direction. The input side is the side of the first forming sheet (22) away from the second forming sheet (23). The output side is the side of the fourth forming sheet (26) away from the second forming sheet (23). A first forming hole (32) penetrates through the second forming sheet (23) and the third forming sheet (25). A fifth forming hole (37) is provided through the fourth forming sheet (26). A second flow channel (43) is provided on the surface of the first forming sheet (22) close to the second forming sheet (23). A second injection hole (12) penetrates through the first forming sheet (22), the second forming sheet (23) and the third forming sheet (25). One end of the second flow channel (43) is communicated with a third injection hole (11), and the other end is communicated with one end of the first forming hole (32) close to the first forming sheet (22); a fourth forming hole (35) is provided through the third forming sheet (25). A fourth flow channel (45) is provided on the surface of the second forming sheet (23) close to the third forming sheet (25). One end of the fourth flow channel (45) is communicated with the second injection hole (12), and the other end is communicated with one end of the fourth forming hole (35) close to the second forming sheet (23).

3. The extruding die for the sealing strip according to claim 2, wherein: The fourth forming holes (35) are three independent ones, the fourth flow channels (45) are three, one ends of the three fourth flow channels (45) are respectively communicated with one ends of the three fourth forming holes (35), the other ends of the three fourth flow channels (45) are respectively communicated with first material passing holes (30), the three first material passing holes (30) respectively penetrate through the first forming sheet (22) and the second forming sheet (23), and the three first material passing holes (30) are all communicated with the second injection hole (12); An inlet die table (1) is covered on the input side of the first forming sheet (22), the second injection hole (12) and the third injection hole (11) both penetrate through the inlet die table (1), three diversion channels (51) are arranged on one side of the inlet die table (1) close to the first forming sheet (22), one ends of the three diversion channels (51) are all communicated with the second injection hole (12), and the other ends of the three diversion channels (51) are respectively communicated with corresponding first material passing holes (30).

4. A sealing strip extrusion die according to claim 1, characterized in that: The forming part (2) includes a first forming sheet (22), a second forming sheet (23), a third forming sheet (25) and a fourth forming sheet (26) which are stacked in sequence along the forming direction. The input side is the side of the first forming sheet (22) far from the second forming sheet (23). The first forming hole (32) penetrates through the second forming sheet (23) and the third forming sheet (25). The fifth forming hole (37) is arranged through the fourth forming sheet (26). The first injection hole (8) penetrates through the first forming sheet (22), the second forming sheet (23) and the third forming sheet (25). The second forming hole (33) and the third forming hole (34) are both arranged through the third forming sheet (25). A second material passing hole (31) is arranged through the second forming sheet (23), and the second material passing hole (31) is communicated with the third forming hole (34). A first flow channel (42) is arranged on one side of the first forming sheet (22) close to the second forming sheet (23), one end of the first flow channel (42) is communicated with the first injection hole (8), and the other end is communicated with the second material passing hole (31). A third flow channel (44) is arranged on one side of the second forming sheet (23) close to the third forming sheet (25), one end of the third flow channel (44) is communicated with the second forming hole (33), and the other end is communicated with the first injection hole (8). A seventh flow channel (47) is arranged on one side of the third forming sheet (25) close to the fourth forming sheet (26), one end of the seventh flow channel (47) is communicated with the first injection hole (8), and a part of the fifth forming hole (37) corresponding to the sliding part (18) of the sealing strip is communicated with the other end of the seventh flow channel (47).

5. A sealing strip extrusion die according to claim 1, characterized in that: The edge of the twelfth flow channel (38) is lower than the flange (54) on the side of the fifth forming piece (27) close to the forming part (2). The part of the first product extrusion hole (13) corresponding to the friction layer (17) of the sealing strip corresponds to the flange (54). The friction layer (17) is serpentine. The flange (54) is provided with a protrusion (36) at a position corresponding to the corner of the friction layer (17). The side of the fifth forming piece (27) close to the forming part (2) is flush with the end face of the protrusion (36). The protrusion (36) protrudes into the first product extrusion hole (13). The heat insulation structure is a second boss (39) fixedly arranged on the side of the fifth forming piece (27) close to the forming part (2). The second boss (39) abuts against the output side of the forming part (2). The first product extrusion hole (13) penetrates through the second boss (39).

6. The extruding die for a sealing strip according to claim 5, characterized in that: A first boss (6) is fixedly arranged on the side of the heating die table (3) far from the forming part (2). The part of the first product extrusion hole (13) corresponding to the friction layer (17) of the sealing strip is close to the first boss (6). The heating rod is inserted on the first boss (6).

Images