Piston rod sealing piece for three-telescopic hydraulic support stand column

Abstract

The utility model relates to a piston rod sealing element for a three-telescopic hydraulic support stand column, and the piston rod sealing element comprises a sealing element body which sleeves the outer side of a piston rod and is matched with a mounting groove of the stand column; the multiple bosses are divided into two sets, and the two sets of bosses are arranged on the two sides of the sealing piece body respectively. The sealing capacity of the two ends of the sealing element is improved in the mode that the boss is additionally arranged at the root of the sealing element body when pressure is exerted on the two ends of the sealing element, no leakage exists on the high-pressure side and the low-pressure side in the application process of a piston rod of the three-telescopic stand column, and the sealing capacity of the root of a product is improved through the interference magnitude of the boss when the root of the product bears reverse pressure so that no leakage can be guaranteed. Therefore, the sealing effect of the piston rod is improved.

Description

Technical Field

[0001] The present application relates to the technical field of sealing devices, and in particular to a piston rod seal for a three-telescopic hydraulic support column. Background Art

[0002] The hydraulic support is a structure used to control the mine pressure at the coal mining face. The mine pressure at the mining face acts on the hydraulic support in the form of external load. The hydraulic support column cylinder is supported between the base and the top beam or the shield beam to adjust the support height and carry the hydraulic cylinder, which is required to have high compressive and bending strength and sealing performance. Compared with traditional cylinders and double telescopic column cylinders, the biggest design difference of the three-telescopic column cylinder is that there is a balance rod designed to balance the pressure inside the active column, and both ends of the balance rod are under pressure. The current rod seal cannot seal the forces at both ends of the balance rod at the same time, which affects the sealing effect of the piston rod. Utility Model Content

[0003] In order to improve the sealing effect of the piston rod, the present application provides a piston rod seal for a triple telescopic hydraulic support column.

[0004] The present application provides a piston rod seal for a three-telescopic hydraulic support column, which adopts the following technical solution:

[0005] A piston rod seal for a three-telescopic hydraulic support column, comprising:

[0006] The sealing body is sleeved on the outside of the piston rod and matched with the mounting groove of the column;

[0007] There are multiple bosses, and the multiple bosses are divided into two groups, and the two groups of bosses are respectively arranged on both sides of the sealing body.

[0008] Furthermore, one side of the plurality of bosses facing away from the sealing element body is configured as an arc surface.

[0009] Furthermore, the side of the boss close to the bottom of the seal body facing away from the other bosses is set as an inclined surface, and the inclined surface is inclined toward the center line of the seal body along the direction of retraction of the piston rod.

[0010] Furthermore, the inclined surface of the boss close to the sealing body extends to the bottom of the sealing body.

[0011] Furthermore, the side of the boss away from the bottom of the seal body facing away from the other bosses is set as an inclined surface, and the inclined surface is inclined toward the center line of the seal body along the direction in which the piston rod extends.

[0012] Furthermore, adjacent bosses are spaced apart to form gaps.

[0013] Furthermore, the bottom surface of the gap between adjacent bosses is set to be a curved surface.

[0014] In summary, the beneficial technical effects of the present application are as follows: currently, the main function of the rod seal is to withstand the pressure from the system medium, the lip position is deformed, and a clamping force is generated on the piston rod to seal the medium. Conventional rod seals can only play a one-way sealing role and cannot seal the pressure from the root. The present application optimizes the structure of the seal so that the seal has a good contact stress in the initial state, so that the rod seal can simultaneously seal the pressure from two directions of the system. Specifically, the sealing ability of the seal when pressure is applied from both ends is improved by adding a boss at the root of the seal body. During the application of the piston rod of the three telescopic columns, there must be no leakage on the high and low pressure sides. The interference fit of the boss is used to improve the sealing ability of the product when the root is subjected to reverse pressure to ensure that no leakage occurs, thereby achieving the purpose of improving the sealing effect of the piston rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application.

[0016] Reference numerals: 100, sealing element body; 200, boss; 300, gap. DETAILED DESCRIPTION

[0017] The technical solution of the present application will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present application.

[0018] The present application embodiment discloses a piston rod seal for a three-telescopic hydraulic support column. Figure 1 The seal includes a seal body 100 and a boss 200 .

[0019] There are multiple bosses 200, and the multiple bosses 200 all extend along the circumferential direction of the seal body 100. The multiple bosses 200 are divided into two groups, and the two groups of bosses 200 are arranged on both sides of the seal body 100, and the two groups of bosses 200 are symmetrically arranged on the seal cross section. In this embodiment, there are six bosses 200, and three bosses 200 form a group. The following describes the layout of the bosses 200 by taking a group of bosses 200 on one side of the seal body 100 as an example.

[0020] The side of the boss 200 near the bottom of the seal body 100 facing away from the other two bosses 200 is set as a slope, and along the direction of retraction of the piston rod, the slope is inclined in the direction close to the center line of the seal body 100 and extends to the bottom of the seal body 100, so that the slope forms a guide surface for the extension movement of the piston rod, thereby facilitating the movement of the piston rod.

[0021] The side of the boss 200 away from the bottom of the seal body 100 that is away from the other two bosses 200 is set as a slope, and along the direction in which the piston rod extends, the slope is inclined toward the direction close to the center line of the seal body 100, so that the slope can form a guide surface for the retracting movement of the piston rod, thereby further facilitating the movement of the piston rod.

[0022] The sides of the three bosses 200 facing away from the seal body 100 are all set as arc surfaces, and the three bosses 200 are arranged at intervals to form a gap 300. The bottom surface of the gap 300 is set as an arc surface, and the arc surface of the boss 200 is tangent to the arc surface of the bottom surface of the gap 300, thereby reducing the stress concentration at the connection position between the boss 200 and the seal when the piston rod is running.

[0023] The implementation principle of a piston rod seal for a three-telescopic hydraulic support column in an embodiment of the present application is as follows: a staff member matches the seal with the installation groove of the column, and at the same time, the seal is sleeved on the outside of the piston rod to complete the installation of the seal; when the piston rod is running, the seal can simultaneously seal the pressure from two directions in the system, thereby achieving the purpose of improving the sealing effect of the piston rod.

[0024] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A piston rod seal for a three-telescopic hydraulic support column, characterized in that: include: The sealing body (100) is sleeved on the outside of the piston rod and is arranged in cooperation with the mounting groove of the column; A plurality of bosses (200) are provided, and the plurality of bosses (200) are divided into two groups, and the two groups of bosses (200) are respectively arranged on both sides of the sealing element body (100).

2. The piston rod seal for a three-telescopic hydraulic support column according to claim 1, characterized in that: The sides of the plurality of bosses (200) facing away from the sealing element body (100) are all configured as arc surfaces.

3. The piston rod seal for a triple telescopic hydraulic support column according to claim 2, characterized in that: The side of the boss (200) close to the bottom of the seal body (100) facing away from the other bosses (200) is arranged as an inclined surface, and the inclined surface is inclined in the direction of the center line of the seal body (100) along the direction of piston rod retraction.

4. The piston rod seal for a triple telescopic hydraulic support column according to claim 3, characterized in that: The inclined surface of the boss (200) close to the sealing body (100) extends to the bottom of the sealing body (100).

5. The piston rod seal for a triple telescopic hydraulic support column according to claim 2, characterized in that: The side of the boss (200) away from the bottom of the seal body (100) and away from the other bosses (200) is arranged as an inclined surface, and the inclined surface is inclined in the direction of the center line of the seal body (100) along the direction in which the piston rod extends.

6. The piston rod seal for a triple telescopic hydraulic support column according to claim 5, characterized in that: Adjacent bosses (200) are spaced apart to form a gap (300).

7. The piston rod seal for a triple telescopic hydraulic support column according to claim 6, characterized in that: The bottom surface of the gap (300) between adjacent bosses (200) is configured as a curved surface.

8. The piston rod seal for a triple telescopic hydraulic support column according to claim 6, characterized in that: The two groups of bosses (200) are symmetrically arranged.

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