Production mold for high-hardness annular sealing element

Abstract

A mold core is arranged in the center of a mold cavity, a drainage layer is arranged at the contact position of the upper end of the mold core and the lower end of an upper mold plate, a rubber injection hole penetrates through the upper mold plate to enable a runner to be communicated with the mold cavity through the drainage layer, rubber enters the drainage layer from the rubber injection hole, and the drainage layer guides the rubber to flow towards the mold cavity around. The mold adopts a mold structure of one-point entering and annular waterfall type integral injection into a mold cavity, so that an integral annular part forms a uniform whole, the interface phenomenon of a traditional process is overcome, the uniformity of annular stress is improved, normal one-point multi-point injection is realized, the production efficiency is improved, and the production cost is reduced. The strength and the tearing performance of the joint part between the points are reduced, the mold structure is particularly suitable for products with high relative hardness and the field with high sealing pressure resistance, the use reliability is greatly improved, the service life of the products is prolonged, and reliable operation of using equipment is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of rubber sealing parts, in particular to a production mold for high-hardness annular sealing parts. Background Art

[0002] There are generally two methods for the production of high-hardness rubber ring seals in molding: feeding method and injection method.

[0003] The addition type generally has the problem of inconsistency in the joints. We found that when making ring-shaped products, this method is usually used. When the rubber is put into the mold cavity, there will be joint overlap, and when the rubber fills the mold cavity, there will be poor joints, especially when the hardness of the rubber is high. Secondly, the rubber blanks of the addition type also have different storage times of the rubber, which causes product uniformity defects.

[0004] The injection type generally adopts one or more points of injection. This method solves the problem of material uniformity, but there are still joint defects at the junction of materials between points. When in use, the seal is easily damaged by pressure at this position, causing seal failure. Especially for high-hardness rubber, due to poor fluidity and high heat generation, it is more likely to produce a significant drop in strength at the joint, making the overall equipment, pipeline network, and machine unable to work normally. Utility Model Content

[0005] In response to the problems in the related technology, the utility model discloses a production mold for a high-hardness annular seal. In order to improve the overall performance consistency of the product, the utility model adopts a mold structure with one-point entry and annular waterfall-style integral injection into the mold cavity, so that the overall annular part forms a uniform whole, overcoming the interface phenomenon of traditional processes and improving the uniformity of annular force.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] A production mold for a high-hardness annular seal comprises an upper mold plate and a lower mold plate, wherein a flow channel and a plurality of glue injection holes are provided on the top of the upper mold plate, and a mold cavity is provided on the lower mold plate, wherein the flow channel guides the flow of rubber, and a plurality of glue injection holes are provided on the flow channel, and a mold core is provided at the center of the mold cavity, and a drainage layer is provided at the contact point between the upper end of the mold core and the lower end of the upper mold plate, and the glue injection holes penetrate the upper mold plate to connect the flow channel with the mold cavity through the drainage layer.

[0008] As a further solution of the utility model: the glue injection hole is arranged above the center of the drainage layer.

[0009] As a further solution of the utility model: the drainage layer is in open communication with the mold cavity located on the periphery.

[0010] As a further solution of the utility model: the relationship between the thickness of the drainage layer and the injection volume and injection time is: injection time = K × injection volume ÷ thickness, K is a constant.

[0011] As a further solution of the utility model: the thickness of the drainage layer is 0.2-1.5 mm, and the injection time is controlled between 20-60 seconds.

[0012] Compared with the prior art, the beneficial effects of the utility model are:

[0013] A production mold for high-hardness annular seals includes an upper mold plate and a lower mold plate. A flow channel and multiple glue injection holes are provided on the top of the upper mold plate, and a mold cavity is provided on the lower mold plate. The flow channel guides the flow of rubber, and multiple glue injection holes are provided on the flow channel. A mold core is provided at the center of the mold cavity. A drainage layer is provided at the contact point between the upper end of the mold core and the lower end of the upper mold plate. The glue injection hole penetrates the upper mold plate to connect the flow channel with the mold cavity through the drainage layer. The rubber enters the drainage layer from the glue injection hole, and the drainage layer guides the rubber to flow to the surrounding mold cavity to form an annular waterfall-style overall injection, avoiding interface phenomenon. This mold adopts a mold structure of one-point entry and annular waterfall-style overall injection into the mold cavity, so that the overall annular part forms a uniform whole, overcomes the interface phenomenon of traditional processes, and improves the uniformity of circumferential force. Traditional one-point or multi-point injection has reduced strength and tearing performance at the joint between points. This mold structure is particularly suitable for products with relatively high hardness and fields with high sealing pressure resistance. The reliability of use is greatly improved, the service life of the product is extended, and the reliable operation of the equipment is ensured. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation to the present invention.

[0015] In the attached picture:

[0016] Figure 1 The utility model is a structural schematic diagram of a production mold for a high-hardness annular seal.

[0017] Figure 2 This is a schematic diagram of the comparative structure of a production mold of a high-hardness annular seal of the utility model before improvement.

[0018] Reference numerals:

[0019] 1. Upper mold plate; 2. Lower mold plate; 3. Runner; 4. Glue injection hole; 5. Mold cavity; 6. Mold core; 7. Drainage layer; DETAILED DESCRIPTION

[0020] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present disclosure. Instead, they are merely examples of devices and methods consistent with some aspects of the present embodiment disclosure as detailed in the appended claims.

[0021] It should be noted that all directional indications in the embodiments (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0022] In addition, the descriptions of "first", "second", etc. in the embodiments are only for descriptive purposes, and do not specifically refer to the order or sequence, nor are they used to limit the present invention. They are only used to distinguish components or operations described with the same technical terms, and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0023] In order to further understand the content, features and effects of the present invention, the following embodiments are given as examples and described in detail with reference to the accompanying drawings:

[0024] like Figure 2 As shown: This is the mold structure of the annular seal in the traditional process, which is a multi-point injection type. Multiple injection points are directly injected into the mold cavity. The annular seal has interface problems between the injection points and joint defects at the confluence of materials between points. When in use, the seal is easily damaged at this position when it is under pressure, causing seal failure. Especially for high-hardness rubber, due to its poor fluidity and high flow heat generation, it is more likely to have a significant drop in strength at the joint, making the overall equipment, pipeline network, and machine unable to work normally.

[0025] like Figure 1 As shown:

[0026] The production mold of the improved high-hardness annular seal includes an upper mold plate 1 and a lower mold plate 2. The top of the upper mold plate 1 is provided with a flow channel 3 and a plurality of glue injection holes 4. The lower mold plate 2 is provided with a mold cavity 5. The flow channel 3 guides the flow of rubber. The flow channel 3 is provided with a plurality of glue injection holes 4. The glue injection holes 4 guide the rubber into the mold cavity 5 to realize the casting of the seal.

[0027] A mold core 6 is provided at the center of the mold cavity 5 , and a drainage layer 7 is provided at the contact point between the upper end of the mold core 6 and the lower end of the upper mold plate 1 . The injection hole 4 penetrates the upper mold plate 1 to connect the flow channel 3 with the mold cavity 5 through the drainage layer 7 .

[0028] Preferably, the glue injection hole 4 is arranged above the center of the drainage layer 7, which improves the uniformity of rubber flow.

[0029] Preferably, the drainage layer 7 is in open communication with the mold cavity 5 located on the periphery to form a perfect waterfall-like integral injection.

[0030] The rubber enters the drainage layer 7 from the injection hole 4, and the drainage layer 7 guides the rubber to flow to the surrounding mold cavity 5, forming an annular waterfall-like overall injection, avoiding the interface phenomenon. The mold adopts a mold structure with one-point entry and annular waterfall-like overall injection into the mold cavity 5, so that the overall annular part forms a uniform whole, overcomes the interface phenomenon of the traditional process, improves the uniformity of the circumferential force, and normally has a one-point multi-point injection. There is a decrease in strength and tearing performance at the joints between points. The mold structure is particularly suitable for products with relatively high hardness and the field of high sealing pressure resistance. The reliability of use is greatly improved, the service life of the product is extended, and the reliable operation of the equipment is ensured.

[0031] The mold structure is a fundamental improvement made to the use defects existing in the sealing products in the single-point or multi-point injection.

[0032] The annular injection space depends on the hardness of the product rubber material. Generally, the thickness of the drainage layer 7 is 0.2-1.5 mm, and the injection time is controlled between 20-60 seconds.

[0033] Generally, the relationship between the thickness of the drainage layer 7 and the injection volume and injection time is: injection time = K × injection volume / thickness, where K is a constant.

[0034] The mold and process of this structural form are particularly suitable for high-hardness sealing products, overcoming the problems of difficulty in injecting high-hardness rubber and high heat generation resulting in defective products.

[0035] The utility model has irreplaceable effects on improving product uniformity quality, reducing injection time, and saving molding time.

[0036] Compared with the traditional injection method, it fundamentally improves the weak links in the connection between points, improves the reliability of product use, and greatly increases the service life of equipment, which is of great significance in the field of rubber sealing products.

[0037] Finally, it should be noted that the above disclosure is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the aforementioned embodiments, it is still possible for a person skilled in the art to modify the technical solutions described in the aforementioned embodiments or to replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model. The scope of this application is limited only by the attached claims.

Claims

1. A production mold for a high-hardness annular seal, comprising an upper mold plate (1) and a lower mold plate (2), wherein a flow channel (3) and a plurality of glue injection holes (4) are provided on the top of the upper mold plate (1), and a mold cavity (5) is provided on the lower mold plate (2), wherein the flow channel (3) guides the flow of rubber, and a plurality of glue injection holes (4) are provided on the flow channel (3), characterized in that: A mold core (6) is provided at the center of the mold cavity (5); a drainage layer (7) is provided at the contact point between the upper end of the mold core (6) and the lower end of the upper mold plate (1); and the injection hole (4) penetrates the upper mold plate (1) to connect the flow channel (3) with the mold cavity (5) through the drainage layer (7).

2. The production mold for a high-hardness annular seal according to claim 1, characterized in that: The glue injection hole (4) is arranged above the center of the drainage layer (7).

3. The production mold for a high-hardness annular seal according to claim 1, characterized in that: The drainage layer (7) is in open communication with the mold cavity (5) located on the periphery.

4. The production mold for a high-hardness annular seal according to claim 1, characterized in that: The thickness of the drainage layer (7) is 0.2-1.5 mm, and the injection time is controlled between 20-60 seconds.

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