A sealing connection structure for injection molding machine parts

Abstract

This utility model discloses a sealing connection structure for injection molding machine parts, relating to the field of injection molding machine technology. It includes a body with a T-shaped transmission channel extending through three sides; a circular groove axially formed on the bottom surface of the body located within the T-shaped transmission channel; and several mounting holes equidistantly spaced on the inner top wall of the groove; and an annular sealing gasket fitted against the inner top wall of the groove. This utility model, through a pear-shaped negative suction section, particularly its bucket-shaped tapering section, efficiently converts the axial compressive force of the parts into a continuous radial expansion force pointing towards the axis of the parts, based on the wedge principle. This force is actively formed at the moment of assembly and works in conjunction with the system pressure, allowing the sealing pressure to dynamically and adaptively adjust according to changes in operating conditions. This effectively overcomes the stress relaxation problem caused by vibration and thermal cycling, fundamentally eliminating the risk of leakage.

Description

Technical Field

[0001] This utility model relates to the field of injection molding machine technology, specifically to a sealing connection structure for injection molding machine accessories. Background Technology

[0002] In the field of injection molding machines, hydraulic systems and mold temperature control systems rely on complex fluid transmission channels. These channels are typically connected by grooves in the body and fittings. To ensure sealing, a common approach is to add an annular gasket between the fitting and the mounting hole.

[0003] However, traditional sealing structures primarily rely on applying axial compression to the gasket, causing it to expand laterally to achieve a seal. This method has inherent drawbacks: First, its sealing force is passive and singular, highly dependent on the initial assembly preload, and prone to stress relaxation and leakage under long-term vibration or temperature changes; second, traditional gaskets lack dynamic response to system pressure fluctuations and cannot automatically compensate for sealing contact pressure when pressure decreases, posing a risk of instantaneous leakage; finally, excessively increasing the compression to improve sealing performance can easily lead to permanent deformation of the gasket and premature failure. Utility Model Content

[0004] In view of the shortcomings of the existing technology, this utility model provides a sealing connection structure for injection molding machine parts.

[0005] To achieve the above objectives, the technical solution of this utility model is as follows: A sealing connection structure for injection molding machine parts, comprising:

[0006] The main body has a T-shaped transmission channel that runs through three sides;

[0007] A circular groove is axially formed on the bottom surface of the body located in the "T"-shaped transmission channel, and a plurality of mounting holes are equidistantly formed on the inner top wall of the groove.

[0008] An annular sealing gasket, which is fitted onto the inner top wall of the groove, the sealing gasket comprising:

[0009] Several connecting parts are provided, corresponding to each mounting hole and axially spaced. When the accessory passes through the connecting part and connects to the mounting hole, the extrusion force of the sealing gasket relative to the axial forward direction of the accessory generates a rebound force.

[0010] Several sets of pear-shaped negative suction parts are arranged in a ring at equal intervals around the corresponding connecting part, and are configured to work with the rebound force to form a radial expansion force that continuously points towards the pressing surface of the accessory.

[0011] Preferably, the internal contour of the negative suction part is formed by a smooth curve, with its maximum width located on one side near the opening of the groove, and gradually tapering towards the depth of the groove.

[0012] Preferably, the negative suction section includes a funnel-shaped tapered section and a cylindrical groove section that are connected to each other. The funnel-shaped tapered section extends from the axial direction of the fitting towards the interior of the sealing gasket and communicates with the cylindrical groove section.

[0013] Preferably, the angle between the sidewall of the bucket-shaped tapering section and the inner wall of the sealing gasket is 30°-60°.

[0014] Preferably, the depth of the cylindrical groove section is 1.5 to 3 times the depth of the bucket-shaped tapering section.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0016] 1. This utility model utilizes a pear-shaped negative suction section, especially its bucket-shaped tapering section, to efficiently convert the axial compressive force of the component into a radial expansion force that continuously points towards the axis of the component, based on the wedge principle. This force is actively formed at the moment of assembly and works in synergy with the system pressure, enabling the sealing pressure to dynamically and adaptively adjust with changes in working conditions. This effectively overcomes the stress relaxation problem caused by vibration and thermal cycling, and fundamentally eliminates the risk of leakage.

[0017] 2. This utility model forms a two-stage synergistic sealing mechanism with instantaneous response and long-term maintenance through a composite structure consisting of a bucket-shaped tapering section and a cylindrical groove section. This structure not only provides a strong initial sealing force, but its deep cylindrical groove section also acts as a highly efficient elastic energy storage unit, which can effectively buffer pressure fluctuations and mechanical impacts, ensure continuous and stable sealing contact pressure, and significantly improve the reliability of the connection structure under complex working conditions.

[0018] 3. This utility model significantly extends the service life of the sealing element. Since the sealing force mainly comes from the elastic deformation guided by the structure rather than extreme axial compression, it avoids excessive compaction and permanent deformation of the sealing gasket material. At the same time, the elastic potential energy stored in the cylindrical groove section can automatically compensate for the micro wear of the sealing surface, so that the sealing gasket can maintain excellent sealing performance throughout its entire life cycle, thereby greatly extending its service life and reducing maintenance frequency and cost. Attached Figure Description

[0019] The disclosure of this utility model is illustrated with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of this utility model. In the drawings, the same reference numerals are used to refer to the same parts. Wherein:

[0020] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0021] Figure 2 This is a schematic diagram of the sealing gasket structure of this utility model;

[0022] Figure 3 This is a schematic diagram of the adaptive adjustment state change structure of the negative suction part of this utility model.

[0023] The diagram is labeled as follows: 1. Body; 11. Groove; 2. Sealing gasket; 21. Connecting part; 22. Negative suction part; 221. Bucket-shaped tapering section; 222. Cylindrical groove section. Detailed Implementation

[0024] It is readily understood that, based on the technical solution of this utility model, those skilled in the art can propose various interchangeable structural methods and implementations without altering the essential spirit of this utility model. Therefore, the following detailed embodiments and accompanying drawings are merely illustrative descriptions of the technical solution of this utility model and should not be considered as the entirety of this utility model or as limitations or restrictions on the technical solution of this utility model.

[0025] Example

[0026] like Figures 1-3 As shown, a sealing connection structure for an injection molding machine accessory includes:

[0027] The main body 1 has a T-shaped transmission channel that runs through three sides inside;

[0028] A circular groove 11 is axially opened on the bottom surface of the body 1 located in the "T"-shaped transmission channel. The inner top wall of the groove 11 is provided with a number of mounting holes 111 at equal intervals.

[0029] An annular sealing gasket 2, made of elastic nitrile rubber or fluororubber, is fitted onto the inner top wall of the groove 11. The sealing gasket 2 includes:

[0030] Several connecting parts 21 are provided, corresponding to each mounting hole 111 and axially spaced. When the accessory passes through the connecting part 21 and connects to the mounting hole 111, the extrusion force of the sealing gasket 2 relative to the axial forward direction of the accessory generates a rebound force.

[0031] Several sets of pear-shaped negative suction parts 22 are arranged in a ring at equal intervals around the corresponding connecting part 21, and are configured to work with the rebound force to form a radial expansion force that continuously points towards the pressing surface of the accessory.

[0032] The internal contour of the negative suction part 22 is composed of a smooth curve, with its maximum width located on one side near the opening of the groove 11, and gradually tapering towards the depth of the groove 11.

[0033] The negative suction section 22 includes a funnel-shaped tapered section 221 and a cylindrical groove section 222 that are connected. The funnel-shaped tapered section 221 extends from the axial direction of the fitting toward the interior of the sealing gasket 2 and communicates with the cylindrical groove section 222.

[0034] like Figures 1-3 As shown, the fitting is inserted axially, penetrating the connecting portion 21 of the sealing gasket 2 and connecting to the mounting hole 111. The fitting's pressing surface first contacts and compresses the funnel-shaped tapered section 221 of the pear-shaped negative suction portion 22. Since the angle between the side wall of the funnel-shaped tapered section 221 and the inner wall of the sealing gasket 2 is 30°-60°, utilizing the inclined surface of the funnel structure and the side wall angle of 30°-60°, based on the wedge principle, the axial movement of the fitting is efficiently converted into radial movement and compression of the sealing gasket 2 material towards the axis of the fitting. This process generates a directional radial preload in the initial sealing stage, achieving instantaneous active sealing. This overcomes the disadvantage of slow response in the initial stage of traditional sealing gaskets 2, giving the sealing gasket 2 the ability to seal instantly and actively. It is not passively compressed, but actively holds the fitting through structural design at the moment of contact, achieving zero-leakage sealing in the initial stage.

[0035] like Figures 2-3 As shown, the axial compression action is further transmitted deep into the structure, compressing the cylindrical groove section 222. Since the depth of the cylindrical groove section 222 is 1.5 to 3 times the depth of the funnel-shaped tapered section 221, it acts as a main energy storage cavity, providing the main deformation stroke and converting mechanical energy into potential energy stored in the elastic material, i.e., rebound force. At this time, the funnel-shaped tapered section 221 continuously provides guiding sealing force, while the cylindrical groove section 222 provides a deep and stable base sealing force. Together, they transform the single compression action into a continuous and uniformly distributed radial expansion pressure field, tightly contacting the fittings and establishing a reliable main seal.

[0036] When the injection molding machine experiences pressure fluctuations, temperature changes, or mechanical vibrations, this structure, facing pressure peaks, absorbs pulse energy through slight further compression of the cylindrical groove section 222, preventing damage due to excessive stress at the sealing interface. After long-term operation, if slight wear occurs, the elastic potential energy stored in the cylindrical groove section 222 will push the entire sealing structure forward slightly, automatically filling the gaps caused by wear and maintaining sealing pressure. The entire pear-shaped negative suction section 22 system constitutes a dynamic system that effectively suppresses and absorbs vibration energy, preventing loosening of connections. This stage ensures that the sealing system does not rely on continuous bolt preload or initial compression, but rather on its internal structure to achieve a long-term, stable, and adaptive dynamic tight seal.

[0037] The technical scope of this utility model is not limited to the content described above. Those skilled in the art can make various modifications and variations to the above embodiments without departing from the technical concept of this utility model, and all such modifications and variations should fall within the protection scope of this utility model.

Claims

1. A sealing connection structure for injection molding machine parts, characterized in that, include: The main body has a "T"-shaped transmission channel that runs through three sides inside; A circular groove is formed axially on the bottom surface of the body located in the "T"-shaped transmission channel, and a plurality of mounting holes are formed circumferentially at equal intervals on the inner top wall of the groove. An annular sealing gasket, which is fitted onto the inner top wall of the groove, the sealing gasket comprising: Several connecting parts are provided, corresponding to each mounting hole and axially spaced. When the accessory passes through the connecting part and connects to the mounting hole, the extrusion force of the sealing gasket relative to the axial forward direction of the accessory generates a rebound force. Several sets of pear-shaped negative suction parts are arranged in a ring at equal intervals around the corresponding connecting part, and are configured to work with the rebound force to form a radial expansion force that continuously points towards the pressing surface of the accessory.

2. The sealing connection structure for an injection molding machine accessory according to claim 1, characterized in that: The internal contour of the negative suction section is formed by a smooth curve, with its maximum width located on one side near the opening of the groove, and gradually tapering towards the depth of the groove.

3. The sealing connection structure for an injection molding machine accessory according to claim 2, characterized in that: The negative suction section includes a funnel-shaped tapered section and a cylindrical groove section that are connected to each other. The funnel-shaped tapered section extends from the axial direction of the fitting towards the interior of the sealing gasket and communicates with the cylindrical groove section.

4. The sealing connection structure for an injection molding machine accessory according to claim 3, characterized in that: The angle between the sidewall of the bucket-shaped tapering section and the inner wall of the sealing gasket is 30°-60°.

5. The sealing connection structure for an injection molding machine accessory according to claim 4, characterized in that: The depth of the cylindrical groove section is 1.5 to 3 times the depth of the bucket-shaped tapering section.

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