CN215750460U

CN215750460U - Runner injection mold of sealing ring

Info

Publication number: CN215750460U
Application number: CN202121467693.7U
Authority: CN
Inventors: 芮巧红; 何志刚
Original assignee: Nanjing Jinsanli Rubber & Plastic Co ltd
Current assignee: Nanjing Jinsanli Rubber & Plastic Co ltd
Priority date: 2021-06-29
Filing date: 2021-06-29
Publication date: 2022-02-08
Anticipated expiration: 2031-06-29

Abstract

The utility model discloses a runner injection mold of a sealing ring, and belongs to the technical field of rubber sealing piece processing. The utility model discloses an injection mold, which comprises a vulcanization mold and an injection channel system, wherein the vulcanization mold comprises an upper mold and a lower mold, a plurality of upper cavities are arranged on the lower end surface of the upper mold, a mold core is arranged in the center of each upper cavity, a plurality of lower cavities for accommodating the mold core, a first negative pressure groove and a first exhaust groove are arranged on the upper end surface of the lower mold, the first negative pressure groove is communicated with the lower cavities adjacent to the first negative pressure groove through the first exhaust groove, a first negative pressure hole is formed in the first negative pressure groove, and a negative pressure nozzle communicated with the first negative pressure hole is arranged on the side surface of the lower mold; after the upper die and the lower die are assembled, the upper die cavity and the lower die cavity jointly form a vulcanization die cavity. The mold provided by the utility model achieves the purpose of increasing the injection pressure in the vulcanization cavity by forming the negative pressure pumping channel connected with the vulcanization cavity on the vulcanization mold.

Description

Runner injection mold of sealing ring

Technical Field

The utility model relates to the technical field of rubber sealing element processing, in particular to a runner injection mold of a sealing ring.

Background

The rubber sealing ring has simple structure and reliable sealing performance, and is widely applied to various sealing fields. The rubber sealing ring is molded by using a rubber molding technology, and the rubber molding technology is developed through three stages of compression molding, injection molding and cold runner injection molding.

At present, due to the effects of factors such as processing cost, product quality and the like, three molding processes are still used, more rubber sealing rings are still subjected to compression molding, and the number of cold runner injection molding processes is relatively small. The cold runner sealing element rubber seal is suitable for rubber materials with low rubber hardness and good fluidity, and the cold runner sealing ring adopts an injection molding process and has the advantages of high production efficiency, stable product performance, low consumption and the like. However, when a rotary body sealing ring with an inner ring diameter of about 30mm and an outer edge diameter of about 50mm is produced, a cold runner injection mold injection molding process is adopted with certain difficulty, and the first problem is that the inner space of the cavity of the sealing ring is small, and a rubber material is easy to block in the cavity, so that how to increase the injection pressure of the rubber material in the mold becomes a technical problem to be solved urgently.

Through retrieval, the prior art discloses a cold runner rubber injection mold (application number: 201921397752.0, application date: 26/8/2019), which comprises a first template, a second template, a third template and a fourth template which are sequentially arranged from top to bottom, wherein the second template is provided with an upper mold core assembly, the upper mold core assembly is provided with an upper mold cavity and a feed hole, the third template is provided with a middle mold core, the middle mold core is provided with a mold core channel, the fourth template is provided with a lower mold core, and the upper mold core assembly, the middle mold core and the lower mold core surround to form a molding mold cavity communicated with the feed hole; the material receiving device is characterized in that a connecting hole used for communicating the upper end part and the lower end part of the first template is formed in the first template, a material receiving cavity and a main runner are arranged at the upper end part of the first template, and a sub-runner is arranged at the lower end part of the first template.

This application can accurate control injection rubber raw materials's quantity, reduces rubber raw materials extravagant, practices thrift the cost to rubber raw materials in the runner is the fluid state always, can inject at any time, and save time can improve production efficiency. However, this application does not solve the problem that the injection pressure of the rubber material in the mold cavity is insufficient, and if the injection rubber material is not in a liquid state or the space in the mold cavity is small, the injection pressure is insufficient, which tends to cause low production efficiency and low product quality.

SUMMERY OF THE UTILITY MODEL

1. Technical problem to be solved by the utility model

The utility model aims to solve the problem that the injection pressure of an injection channel injection rubber mold in a mold cavity is insufficient in the prior art, and provides a cold flow injection mold of a sealing ring.

2. Technical scheme

In order to achieve the purpose, the technical scheme provided by the utility model is as follows:

the utility model relates to a runner injection mold of a sealing ring, which comprises a vulcanization mold and an injection channel system;

the vulcanizing mould comprises an upper mould and a lower mould, wherein a plurality of upper cavities are arranged on the lower end surface of the upper mould, and a mould core is arranged at the central position of each upper cavity;

the upper end face of the lower die is provided with a plurality of lower cavities for accommodating the die cores, a first negative pressure groove and a first exhaust groove, the first negative pressure groove is an annular groove located in the middle of the upper end face of the lower die, the lower cavities are distributed annularly between the outer edge of the first negative pressure groove and the outer edge of the lower die, the first negative pressure groove is communicated with the lower cavities located adjacent to the first negative pressure groove through the first exhaust groove, a first negative pressure hole is formed in the first negative pressure groove, and the side face of the lower die is provided with a negative pressure nozzle communicated with the first negative pressure hole;

after the upper die and the lower die are assembled, the upper die cavity and the lower die cavity jointly form a vulcanization die cavity, the injection channel system comprises a plurality of injection channels which are communicated, a plurality of glue outlets are formed in the injection channels, a glue inlet corresponding to the glue outlets is formed in the upper end surface of the upper die, and rubber materials enter the vulcanization die cavity from the glue inlet.

Further, a filtering component is arranged at the opening of the first negative pressure hole in the first negative pressure groove.

Furthermore, an annular second negative pressure groove is formed between the outer edge of the lower die and the lower die cavity, the lower die cavity and the second negative pressure groove which are located at adjacent positions are communicated through a second exhaust groove, a second negative pressure hole is formed in the second exhaust groove, and the second negative pressure hole is communicated with the negative pressure nozzle.

Further, a sealing groove is formed between the outer edge of the lower die and the second negative pressure groove, and a sealing part is installed in the sealing groove.

Furthermore, the injection channel system comprises an upper plate and a lower plate, wherein the upper plate is provided with a glue injection port, the position of the lower plate corresponding to the glue injection port is a starting position, and the plurality of injection channels are arranged from the starting position to the edge of the lower plate.

Further, the glue injection port is arranged at the geometric center of the upper plate surface, and the glue outlet is arranged at the end position of the injection channel.

Further, the hypoplastron is provided with the face that sinks, the injection passageway is located the face that sinks, the upper plate is provided with and sinks face matched with protruding face.

Furthermore, the glue inlet is arranged between the adjacent upper cavities, a glue injection groove corresponding to the position of the glue inlet is arranged between the lower cavities of the lower die, and the glue injection groove is communicated with the lower cavities.

Further, the glue injection groove is communicated with at least two adjacent lower cavities.

Further, the diameter of the first negative pressure hole is between 10mm and 14 mm.

3. Advantageous effects

Compared with the prior art, the technical scheme provided by the utility model has the following beneficial effects:

(1) the utility model discloses a cold flow injection mold of a sealing ring, which comprises a vulcanization mold and an injection channel system, wherein the vulcanization mold comprises an upper mold and a lower mold, a plurality of upper cavities are arranged on the lower end surface of the upper mold, a mold core is arranged in the center of the upper cavities, a plurality of lower cavities for accommodating the mold core, a first negative pressure groove and a first exhaust groove are arranged on the upper end surface of the lower mold, the first negative pressure groove is communicated with the lower cavities adjacent to the first negative pressure groove through the first exhaust groove, a first negative pressure hole is formed in the first negative pressure groove, and a negative pressure nozzle communicated with the first negative pressure hole is arranged on the side surface of the lower mold. The negative pressure nozzle can be externally connected with a negative pressure air exhaust device to realize that the lower cavity close to the first negative pressure groove exhausts outwards, so that the injection pressure of the rubber material in the cavity is increased in a mode of forming negative pressure in the lower cavity, the production efficiency is further improved, and the product quality is improved.

(2) An annular second negative pressure groove is arranged between the outer edge of a lower die and a lower cavity of the injection die, the lower cavity and the second negative pressure groove which are positioned at adjacent positions are communicated through a second exhaust groove, a second negative pressure hole is arranged in the second exhaust groove, and the second negative pressure hole is communicated and connected with a negative pressure nozzle. The injection mold increases the number of the vulcanization mold cavities forming negative pressure through the negative pressure grooves arranged at different positions of the vulcanization mold cavities, and can meet the requirement of arranging more vulcanization mold cavities on the injection mold, thereby improving the production efficiency.

Drawings

FIG. 1 is an exploded view of a cold flow injection mold of the present invention;

FIG. 2 is a schematic view of the lower end surface of the upper die;

FIG. 3 is a schematic view of the upper end surface of the lower mold;

FIG. 4 is a schematic view of the lower end surface of the upper plate;

fig. 5 is a schematic view of the upper end face of the lower plate.

The reference numerals in the schematic drawings illustrate:

1. an upper die; 10. a glue inlet; 11. an upper cavity; 12. a mold core; 2. a lower die; 20. a lower cavity; 21. a first negative pressure groove; 210. a first negative pressure hole; 22. a first exhaust groove; 23. a negative pressure nozzle; 24. a second negative pressure groove; 240. a second negative pressure hole; 25. a second exhaust groove; 26. a sealing groove; 27. injecting glue groove; 3. an upper plate; 30. a glue injection port; 31. a convex surface; 4. a lower plate; 40. a start bit; 41. an injection channel; 42. sinking the surface; 43. and a glue outlet.

Detailed Description

For a further understanding of the utility model, reference should be made to the following detailed description taken in conjunction with the accompanying drawings and examples.

The structure, proportion, size and the like shown in the drawings are only used for matching with the content disclosed in the specification, so that the person skilled in the art can understand and read the description, and the description is not used for limiting the limit condition of the implementation of the utility model, so the method has no technical essence, and any structural modification, proportion relation change or size adjustment still falls within the scope of the technical content disclosed by the utility model without affecting the effect and the achievable purpose of the utility model. In addition, the terms "upper", "lower", "left", "right" and "middle" used in the present specification are for clarity of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the relative positions may be changed or adjusted without substantial technical changes.

The present invention will be further described with reference to the following examples.

Example 1

The sealing ring is mainly made of rubber materials, the common shape is a cylindrical revolving body with a certain height, and the injection mold provided by the utility model is mainly used for producing the revolving body sealing ring with the inner edge diameter of about 30mm and the outer edge diameter of about 50 mm. The sealing ring is formed by injection molding, and has the advantages of high production efficiency, stable product performance, low consumption and the like. The cold runner injection mode has certain requirements on the fluidity and hardness of the rubber material, and the rubber material entering the cavity of the mold can increase the resistance of the material during injection due to the resistance of air in the cavity, so that the injection time is prolonged, the quality of the sealing ring is reduced, and the glue overflow of the injection runner can occur, thereby causing material waste.

As shown in fig. 1 to 5, the cold flow injection mold for the seal ring provided by the utility model can discharge air in a mold cavity, thereby reducing resistance of material injection, improving processing efficiency and reducing material loss. The injection mold comprises an injection channel system and a vulcanization mold, wherein the injection channel system comprises a plurality of injection channels 41 which are communicated, the injection channels 41 are channels for transporting rubber materials into the vulcanization mold, the injection channels 41 adopt a cold flow mode, namely the injection channels 41 are not provided with high temperature, the unvulcanized rubber materials still remain in the injection channels 41 after the injection is finished, and the injection mold can be used for the next production in a production process.

The vulcanizing mold comprises an upper mold 1 and a lower mold 2, wherein a plurality of upper cavities 11 are arranged on the lower end face of the upper mold 1, and mold cores 12 are arranged at the central positions of the upper cavities 11.

2 up end of lower mould is provided with a plurality of and is used for holding lower die cavity 20, first negative pressure groove 21 and the first exhaust groove 22 of mold core 12, and first negative pressure groove 21 is the ring channel for being located 2 up end intermediate positions of lower mould, and lower die cavity 20 is the annular distribution between first negative pressure groove 21 outer fringe and 2 outer fringes of lower mould, and first negative pressure groove 21 communicates through first exhaust groove 22 with lower die cavity 20 that is located the adjacent position of first negative pressure groove 21. A first negative pressure hole 210 is opened in the first negative pressure groove 21, and a negative pressure nozzle 23 communicated with the first negative pressure hole 210 is arranged on the side surface of the lower die 2. This arrangement of the first negative pressure groove 21, the first lower cavity 20 and the first exhaust groove 22 facilitates the exhaust of the lower cavity 20 close to the first negative pressure groove 21. The first negative pressure hole 210 and the negative pressure nozzle 23 can be communicated and connected through a channel arranged on the side surface of the lower die 2 along the horizontal direction, the negative pressure nozzle 23 can be externally connected with a negative pressure air extractor to realize that the lower cavity 20 close to the first negative pressure groove 21 exhausts air outwards, so that the cavity is in a negative pressure state, the injection pressure of rubber materials in the cavity is increased, the production efficiency is improved, and the product quality is improved.

After the upper die 1 and the lower die 2 are closed, the upper die cavity 11 and the lower die cavity 20 jointly form a vulcanization die cavity, a glue outlet 43 is formed in the injection channel 41, a glue inlet 10 corresponding to the glue outlet 43 is formed in the upper end surface of the upper die 1, and rubber materials enter the vulcanization die cavity from the glue inlet 10.

In order to avoid the first negative pressure hole 210 from being blocked by the injected rubber material forming rubber sheet or the like, the first negative pressure hole 210 of the present embodiment is provided with a filter member at an opening in the first negative pressure tank 21, and the filter member may be in the form of a screen or the like.

As the number of the vulcanization cavities of the mold increases, a part of the lower cavity 20 is already away from the position of the first negative pressure groove 21, and the negative pressure state can no longer be achieved by connecting the first negative pressure groove 21. In order to exhaust the lower cavity 20 far from the first negative pressure groove 21, the present embodiment may further include a negative pressure groove. Specifically, an annular second negative pressure groove 24 is arranged between the outer edge of the lower die 2 and the lower cavity 20, the lower cavity 20 and the second negative pressure groove 24 which are located at adjacent positions are communicated through a second exhaust groove 25, a second negative pressure hole 240 is arranged in the second exhaust groove 25, and the second negative pressure hole 240 is communicated with the negative pressure nozzle 23. The second negative pressure hole 240 may communicate with the negative pressure nozzle 23 using the same passage as the first negative pressure hole 210.

In order to increase the sealing performance between the upper die 1 and the lower die 2 and avoid negative pressure damage caused by poor sealing performance during air exhaust, in the embodiment, a sealing groove 26 is formed between the outer edge of the lower die 2 and the second negative pressure groove 24, and a sealing part can be installed in the sealing groove 26, so that the matching strength of the upper die 1 and the lower die 2 is increased, and the sealing performance of the die is improved.

Too large a diameter of the first negative pressure hole 210 requires more air to be discharged, while too small a diameter of the first negative pressure hole easily causes clogging or increases air suction resistance. In order to ensure the air exhaust effect, the diameter of the first negative pressure hole 210 of the embodiment is set between 10mm and 14mm, and similarly, the diameter of the second negative pressure hole 240 can also be set between 10mm and 14 mm.

Example 2

The present embodiment provides further optimization of the injection channel system. The injection channel system comprises an upper plate 3 and a lower plate 4, the upper plate 3 is provided with a glue injection port 30, the glue injection port 30 is provided with an inlet of an injection channel 41 of the injection system, the lower plate 4 is provided with an initial position 40 of the injection channel 41 at a position corresponding to the glue injection port 30, and the rubber material flows into the initial position of the injection channel 41 through the glue injection port 30. In the present embodiment, the rubber material flows to the corresponding position of the cavity through the plurality of injection channels 41, specifically, the start position 40 of the injection channel 41 opens the injection channel 41 to the edge of the lower plate 4, and the number of the injection channels 41 can be increased by splitting the injection channel 41.

In order to facilitate the uniform movement of the rubber material in the injection channel 41, the glue injection port 30 in this embodiment is disposed at the geometric center of the upper plate 3, so that the length of the injection channel 41 is substantially the same, and the glue outlet 43 is disposed at the termination position of the injection channel 41, so that the movement distance of the rubber material in the injection channel 41 is substantially the same.

In order to fix the lower plate 4 and the upper plate 3, increase the lateral positioning effect of the upper plate 4 and the lower plate 4, and improve the sealing performance when the upper plate 4 and the lower plate 4 are covered, in the embodiment, the lower plate 4 is provided with a sunken surface 42, the injection passage 41 is positioned in the sunken surface 42, and the upper plate 3 is provided with a convex surface 31 matched with the sunken surface 42.

In this embodiment, the glue inlet 10 is disposed between the adjacent upper cavities 11, the glue injection groove 27 corresponding to the position of the glue inlet 10 is disposed between the lower cavities 20 of the lower mold 2, and the glue injection groove 27 is communicated with the lower cavities 20. Because the sealing washer of this embodiment production is hollow solid of revolution, and lower die cavity 20 is the groove of certain width, consequently set up the benefit of annotating the gluey groove 27 and lie in can flow into rubber material to lower die cavity 20 through annotating gluey groove 27, avoided directly to form product edge inhomogeneous by the direct rubber material of injecting of lower die cavity 20 to product quality has been improved.

In order to increase the injection speed and improve the production efficiency, the glue injection groove 27 of the present embodiment communicates with at least two adjacent lower cavities 20, as shown in the figure, as an optimized scheme, the glue injection groove 27 is located in the middle of four adjacent lower cavities 20 and communicates with four adjacent lower cavities 20.

The present invention and its embodiments have been described above schematically, without limitation, and what is shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. Therefore, if the person skilled in the art receives the teaching, without departing from the spirit of the utility model, the person skilled in the art shall not inventively design the similar structural modes and embodiments to the technical solution, but shall fall within the scope of the utility model.

Claims

1. The utility model provides a runner injection mold of sealing washer which characterized in that: comprising a vulcanization mould and an injection channel system;

2. The runner injection mold for a seal ring according to claim 1, wherein: and a filtering component is arranged at the opening of the first negative pressure hole in the first negative pressure groove.

3. The runner injection mold for a seal ring according to claim 1, wherein: an annular second negative pressure groove is formed between the outer edge of the lower die and the lower die cavity, the lower die cavity and the second negative pressure groove which are located at adjacent positions are communicated through a second exhaust groove, a second negative pressure hole is formed in the second exhaust groove, and the second negative pressure hole is communicated with the negative pressure nozzle.

4. The runner injection mold for a seal ring according to claim 1, wherein: a sealing groove is formed between the outer edge of the lower die and the second negative pressure groove, and a sealing part is installed in the sealing groove.

5. The runner injection mold for a seal ring according to claim 2, wherein: the injection channel system comprises an upper plate and a lower plate, wherein the upper plate is provided with a glue injection port, the position of the lower plate corresponding to the glue injection port is a starting position, and the plurality of injection channels are arranged from the starting position to the edge of the lower plate.

6. The runner injection mold for a seal ring according to claim 5, wherein: the glue injection port is arranged at the geometric center of the upper plate surface, and the glue outlet is arranged at the stop position of the injection channel.

7. The runner injection mold for a seal ring according to claim 5, wherein: the lower plate is provided with a sinking surface, the injection channel is positioned in the sinking surface, and the upper plate is provided with a convex surface matched with the sinking surface.

8. The runner injection mold for a seal ring according to claim 7, wherein: the glue inlet is arranged between the adjacent upper cavities, glue injection grooves corresponding to the glue inlet are arranged between the lower cavities of the lower die, and the glue injection grooves are communicated with the lower cavities.

9. The runner injection mold for a seal ring according to claim 8, wherein: the glue injection groove is communicated with at least two adjacent lower cavities.

10. The runner injection mold for a seal ring according to claim 1, wherein: the diameter of the first negative pressure hole is between 10mm and 14 mm.