A multi-lip seal ring forming die

Abstract

The utility model relates to a kind of multi-lip sealing ring forming die, including lower mould, upper mould, lower mould, upper mould form the cavity of placing framework after moulding;Wherein, upper mould includes first mould, second mould, third mould, fourth mould sequentially arranged from outside to inside;Second mould is supported on first mould, and second mould and first mould form gas-permeable parting gap;Third mould can be lifted relative to second mould, and second mould and third mould form gas-permeable parting gap;Fourth mould can be lifted relative to third mould, and fourth mould and third mould form gas-permeable parting gap;This mould is using gravity to realize the moulding of upper mould and lower mould;Thus originally located in cavity air is discharged along with the descending of fourth mould, third mould, second mould, first mould in order;In the process of rubber part heating vulcanization, residual air in cavity can be discharged from gas-permeable parting gap, avoid air mixing into molten rubber;Multi-lip sealing ring after forming can avoid the mixing of air, guarantee the service life of multi-lip sealing ring.

Description

Technical Field

[0001] This utility model relates to a sealing ring forming mold, and in particular to a multi-lip sealing ring forming mold. Background Technology

[0002] The core process of multi-lip sealing ring molding is as follows: First, the metal skeleton is precisely positioned in the mold cavity. Then, the rubber raw material is placed between the upper and lower molds. After the mold is closed, pressure is applied and heated to melt the rubber and form a molten medium. Subsequently, the cavity is fully filled and the skeleton is tightly wrapped. Finally, it is cooled and formed into a finished product. In this process, the tightness of the bond between the skeleton and the rubber directly determines the basic performance of the sealing ring.

[0003] However, the existing process has a key technical bottleneck: after the rubber raw material is put into the mold and before it is heated and melted, air will naturally remain in the mold cavity; during the mold closing and heating stage, as the temperature rises, the residual air in the closed space of the cavity expands due to heat and is very easy to penetrate into the interior of the molten rubber with increased fluidity; after the sealing ring cools and forms, these intruded air will form a large number of tiny bubbles that remain inside the product.

[0004] The presence of air bubbles can severely damage the structural integrity of the sealing ring, leading to a significant decrease in its mechanical properties. It results in poor performance in key indicators such as pressure resistance, wear resistance, and aging resistance, directly shortening the service life of the multi-lip sealing ring. It may even cause sealing failure due to the rupture of air bubbles under high pressure conditions. Therefore, how to efficiently remove residual air from the cavity and prevent air from mixing into the molten rubber during the molding process of multi-lip sealing rings has become a key issue that needs to be addressed by those skilled in the art. Utility Model Content

[0005] The technical problem to be solved by this utility model is: how to efficiently remove residual air from the cavity and prevent air from mixing into the molten rubber during the molding process of multi-lip sealing rings; To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: This utility model is a multi-lip sealing ring forming mold, including a lower mold and an upper mold, wherein the lower mold and the upper mold are closed to form a cavity for placing a skeleton; The upper mold includes a first mold, a second mold, a third mold, and a fourth mold arranged sequentially from the outside to the inside; the second mold is supported on the first mold, and a breathable parting gap is formed between the second mold and the first mold; the third mold can be raised and lowered relative to the second mold, and a breathable parting gap is formed between the second mold and the third mold; the fourth mold can be raised and lowered relative to the third mold, and a breathable parting gap is formed between the fourth mold and the third mold.

[0006] Furthermore, a first annular groove is provided on the top outer wall of the third mold, and a first limiting ring is provided in the first annular groove. When the first limiting ring contacts the top inner side of the second mold, the third mold descends to its limit position relative to the second mold.

[0007] Furthermore, a second annular groove is provided on the top outer wall of the fourth mold, and a second limiting ring is provided in the second annular groove. When the second limiting ring contacts the top inner side of the third mold, the fourth mold descends to its limit position relative to the third mold.

[0008] Furthermore, the inner wall of the first mold has a protruding first step portion, and the outer wall of the second mold has a recessed second step portion, which is supported on the first step portion.

[0009] Furthermore, the ventilated parting gap between the first mold and the second mold is located at the end of the first lip of the multi-lip sealing ring, the ventilated parting gap between the second mold and the third mold is located at the end of the second lip of the multi-lip sealing ring, and the ventilated parting gap between the third mold and the fourth mold is located at the end of the third lip of the multi-lip sealing ring.

[0010] Furthermore, the lower mold includes: a lower fixed mold, a support mold is provided on the outer side of the lower fixed mold, a lifting mold is provided on the support mold, and a breathable parting gap is formed between the lifting mold, the lower fixed mold, and the support mold.

[0011] Furthermore, a locking member is inserted upward through the bottom of the support mold, the top of the locking member is connected to the lifting mold, and an elastic member is sleeved on the locking member. One end of the elastic member abuts against the locking member, and the other end of the elastic member abuts against the bottom of the lifting mold.

[0012] Furthermore, when the lower mold and the upper mold are in the closed state, a ventilated parting gap is formed between the lifting mold and the first mold, and an adhesive groove is provided at the ventilated parting gap, which is connected to the cavity.

[0013] Furthermore, the lower mold has an inwardly recessed attachment groove on its top outer wall.

[0014] The beneficial effects of this utility model are as follows: This utility model is a multi-lip sealing ring molding mold. This mold uses gravity to achieve the closing of the upper and lower molds. In this way, the air originally located in the cavity is discharged as the fourth mold, third mold, second mold, and first mold descend in sequence. During the heating and vulcanization process of the rubber part, the residual air in the cavity will be discharged from the ventilated parting gap, preventing air from mixing into the molten rubber. The molded multi-lip sealing ring can avoid the mixing of air, ensuring the service life of the multi-lip sealing ring. Attached Figure Description

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0016] Figure 1 This is a schematic diagram of the structure of a multi-lip sealing ring; Figure 2 This is a schematic diagram of the structure containing a multi-lip sealing ring after mold closing; Figure 3 This is a schematic diagram of the structure containing the skeleton during mold closing; Figure 4 This is a schematic diagram of the structure containing only the skeleton after the mold is closed. Detailed Implementation

[0017] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.

[0018] Because the molding die in this application has a symmetrical structure, Figure 2-4 Only the structural diagram of the left half of the mold is shown; the right half is omitted due to its symmetry.

[0019] See Figure 1-4 This embodiment is a multi-lip sealing ring molding die, including a lower mold 2 and an upper mold 1. After the lower mold 2 and the upper mold 1 are closed, a cavity 3 for placing a skeleton 02 is formed. The upper mold 1 includes a first mold 11, a second mold 12, a third mold 13, and a fourth mold 14 arranged sequentially from the outside to the inside. The second mold 12 is supported on the first mold 11 and can move up and down synchronously with the first mold 11. A breathable parting gap 4 is formed between the second mold 12 and the first mold 11. The third mold 13 can move up and down relative to the second mold 12, and a breathable parting gap 4 is formed between the second mold 12 and the third mold 13. The fourth mold 14 can move up and down relative to the third mold 13, and a breathable parting gap 4 is formed between the fourth mold 14 and the third mold 13. In this embodiment, the lifting mechanism is connected to the first mold 11. During the molding of the multi-lip sealing ring 01, the skeleton 02 is placed on the lower mold, and the rubber part 03 is placed in the cavity. Then, the lifting mechanism drives the first mold 11 to descend. The fourth mold 14 closes first, followed by the third mold 13. Finally, the first mold 11 and the second mold 12 close simultaneously. In this embodiment, gravity is used to achieve the closing of the upper mold 1 and the lower mold 2. In this way, the air originally located in the cavity 3 is discharged as the fourth mold 14, the third mold 13, the second mold 12, and the first mold 11 descend in sequence. During the heating and vulcanization of the rubber part 03, the residual air in the cavity 3 will be discharged from the venting parting gap 4, preventing air from mixing into the molten rubber 03. The molded multi-lip sealing ring 01 can avoid the mixing of air, ensuring the service life of the multi-lip sealing ring 01.

[0020] See Figure 1-4 In some possible embodiments, the top outer wall of the third mold 13 is provided with a first annular groove, and a first limiting ring 51 is provided in the first annular groove. When the first limiting ring 51 contacts the top of the second mold 12, the third mold 13 descends to its limit position relative to the second mold 12. The top outer wall of the fourth mold 14 is provided with a second annular groove, and a second limiting ring 52 is provided in the second annular groove. When the second limiting ring 52 contacts the top of the third mold 13, the fourth mold 14 descends to its limit position relative to the third mold 13. The inner wall of the first mold 11 protrudes and is provided with a first step portion 111, and the second outer wall is recessed and is provided with a second step portion 121. The second step portion 121 is supported on the first step portion 111. In this embodiment, the corresponding limiting ring is located in the corresponding ring groove. The lower limit of the third mold 13 relative to the second mold 12 and the lower limit of the fourth mold 14 relative to the third mold 13 are such that when the lifting mechanism drives the first mold 11 to rise, the second mold 12, the third mold 13 and the fourth mold 14 follow it to rise in sequence, and finally realize the opening of the upper mold 1 and the lower mold 2. The second step 121 is supported on the first step 111, and the lifting and lowering of the first mold 11 can synchronously drive the lifting and lowering of the second mold 12.

[0021] See Figure 1-4 In some possible embodiments, the breathable parting gap 4 between the first mold 11 and the second mold 12 is located at the end of the first lip 011 of the multi-lip sealing ring 01, the breathable parting gap 4 between the second mold 12 and the third mold 13 is located at the end of the second lip 012 of the multi-lip sealing ring 01, and the breathable parting gap 4 between the third mold 13 and the fourth mold 14 is located at the end of the third lip 013 of the multi-lip sealing ring 01. In this embodiment, during the vulcanization process of the rubber part 03, most of the air will remain at the first lip 011, second lip 012, and third lip 013 of the multi-lip sealing ring 01 when the upper mold 1 and lower mold 2 are closed. The ventilated parting gap 4 is set at the first lip 011, second lip 012, and third lip 013 so that the air can be discharged from the ventilated parting gap 4.

[0022] See Figure 1-4 In some possible embodiments, the lower mold 2 includes: a lower fixed mold 21, a support mold 22 is provided on the outer side of the lower fixed mold 21, a lifting mold 23 is provided on the support mold 22, and a breathable parting gap 4 is formed between the lifting mold 23, the lower fixed mold 21, and the support mold 22. In this embodiment, the permeable parting gap 4 is also used to expel air from the cavity 3 during the vulcanization process of the rubber part 03.

[0023] See Figure 1-4 In some possible embodiments, a locking member 61 is inserted upward through the bottom of the support mold 22, the top of the locking member 61 is connected to the lifting mold 23, and an elastic member 62 is sleeved on the locking member 61. One end of the elastic member 62 abuts against the locking member 61, and the other end of the elastic member 61 abuts against the bottom of the lifting mold 23.

[0024] In this embodiment, by setting the locking member 61 and the elastic member 62, the lifting mold 23 can be raised and lowered relative to the supporting mold 22. When the upper and lower molds are opened, the multi-lip sealing ring 01 is attached to the lower mold 2. By the rise of the lifting mold 23, the lifting mold 23 acts on the bottom of the multi-lip sealing ring 01, realizing the demolding of the multi-lip sealing ring 01 after it rises.

[0025] See Figure 1-4 In some possible embodiments, when the lower mold 2 and the upper mold 1 are in the mold-closed state, a ventilated parting gap 4 is formed between the lifting mold 23 and the first mold 11, and an adhesive groove 71 is provided at the ventilated parting gap 4, and the adhesive groove 71 is connected to the cavity 3. The ventilation parting gap 4 is also for the purpose of venting air. The bonding groove 71 is filled with rubber part 03. Excess rubber in the cavity 3 overflows into the bonding groove 71, ensuring the compactness of the cavity 3 and effectively venting air.

[0026] See Figure 1-4 In some possible embodiments, the lower mold 21 has an inwardly recessed attachment groove 72 on its top outer wall; In this embodiment, the formed multi-lip sealing ring 01 will fill the attachment groove 72, ensuring that after the lower mold 2 and the upper mold 1 are opened, the multi-lip sealing ring 01 is attached to the lower mold 2, which facilitates subsequent demolding.

[0027] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A multi-lip sealing ring forming mold, characterized in that, It includes a lower mold and an upper mold, which, when closed, form a cavity for placing the skeleton; The upper mold includes a first mold, a second mold, a third mold, and a fourth mold arranged sequentially from the outside to the inside; the second mold is supported on the first mold, and a breathable parting gap is formed between the second mold and the first mold; the third mold can be raised and lowered relative to the second mold, and a breathable parting gap is formed between the second mold and the third mold; the fourth mold can be raised and lowered relative to the third mold, and a breathable parting gap is formed between the fourth mold and the third mold.

2. The multi-lip sealing ring forming mold according to claim 1, characterized in that, A first annular groove is provided on the top outer wall of the third mold, and a first limiting ring is provided in the first annular groove. When the first limiting ring contacts the top inner side of the second mold, the third mold descends to its limit position relative to the second mold.

3. The multi-lip sealing ring forming mold according to claim 1, characterized in that, A second annular groove is provided on the top outer wall of the fourth mold, and a second limiting ring is provided in the second annular groove. When the second limiting ring contacts the top inner side of the third mold, the fourth mold descends to its limit position relative to the third mold.

4. The multi-lip sealing ring forming mold according to claim 1, characterized in that, The inner wall of the first mold has a protruding first step, and the outer wall of the second mold has a recessed second step, which is supported on the first step.

5. The multi-lip sealing ring forming mold according to claim 1, characterized in that, The ventilated parting gap between the first mold and the second mold is located at the end of the first lip of the multi-lip sealing ring, the ventilated parting gap between the second mold and the third mold is located at the end of the second lip of the multi-lip sealing ring, and the ventilated parting gap between the third mold and the fourth mold is located at the end of the third lip of the multi-lip sealing ring.

6. The multi-lip sealing ring forming mold according to claim 1, characterized in that, The lower mold includes: a lower fixed mold, a support mold provided on the outer side of the lower fixed mold, a lifting mold provided on the support mold, and a breathable parting gap formed between the lifting mold, the lower fixed mold, and the support mold.

7. The multi-lip sealing ring forming mold according to claim 6, characterized in that, A locking member is inserted upward through the bottom of the support mold. The top of the locking member is connected to the lifting mold. An elastic member is sleeved on the locking member. One end of the elastic member abuts against the locking member, and the other end of the elastic member abuts against the bottom of the lifting mold.

8. The multi-lip sealing ring forming mold according to claim 6, characterized in that, When the lower mold and the upper mold are in the closed state, a ventilated parting gap is formed between the lifting mold and the first mold. An adhesive groove is provided at the ventilated parting gap, and the adhesive groove is connected to the cavity.

9. The multi-lip sealing ring forming mold according to claim 6, characterized in that, The lower mold has an inwardly recessed attachment groove on its top outer wall.

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