Large-diameter hydraulic support

Abstract

The utility model relates to the technical field of mechanical equipment, in particular to a large-diameter hydraulic support which comprises an outer cylinder barrel and a piston in the cylinder barrel, a cavity is formed in the cylinder barrel, the side face of the cylinder barrel is a side wall, the piston is installed in the cavity, and hydraulic oil is further filled in the cavity. The cylinder barrel comprises an outer-layer barrel body and an inner-layer barrel body, a copper-zinc alloy layer is arranged between the outer-layer barrel body and the inner-layer barrel body, the copper-zinc alloy layer is a middle-layer barrel body, and the contact parts of the outer-layer barrel body, the middle-layer barrel body and the inner-layer barrel body are of matched structures and are in interference fit. The hydraulic cylinder has the advantages that the cylinder barrel and the piston are still well matched when the temperature rises, and the using effect is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical equipment, specifically to a hydraulic support. Background Art

[0002] A hydraulic support includes an outer cylinder barrel and a piston inside the cylinder barrel. The cylinder barrel has a cavity inside, and on the side of the cylinder barrel is a side wall. The piston is installed inside the cavity, and hydraulic oil is also filled inside the cavity.

[0003] The hydraulic support is the main equipment for fully mechanized coal mining work in coal mines, mainly playing the role of supporting and controlling the roof of the working face. During the use process, the frequent operation of the hydraulic support will generate more heat, resulting in the increase of the temperature of the hydraulic support.

[0004] In the prior art, each component of the hydraulic support, including the cylinder barrel and the piston, is made of iron material; due to thermal expansion and contraction, the increase in temperature will affect the fit between the cylinder barrel and the piston, especially for large-diameter hydraulic supports. Based on this, improvement is needed. Summary of the Invention

[0005] The purpose of the utility model is to provide a large-diameter hydraulic support that still has a good fit between the cylinder barrel and the piston when the temperature rises, ensuring the use effect, aiming at the above-mentioned disadvantages.

[0006] The technical solution adopted by the utility model is: a large-diameter hydraulic support includes an outer cylinder barrel and a piston inside the cylinder barrel. The cylinder barrel has a cavity inside, and on the side of the cylinder barrel is a side wall. The piston is installed inside the cavity, and hydraulic oil is also filled inside the cavity; the feature is that: the cylinder barrel includes an outer layer cylinder body and an inner layer cylinder body, and there is a copper-zinc alloy layer between the outer layer cylinder body and the inner layer cylinder body. The copper-zinc alloy layer is the middle layer cylinder body, and the contact parts of the outer layer cylinder body, the middle layer cylinder body and the inner layer cylinder body are in a matching structure and interference fit.

[0007] Furthermore, the thickness of the middle layer cylinder body is 2 - 3 millimeters.

[0008] Furthermore, the thickness of the inner layer cylinder body is 3 - 5 millimeters.

[0009] Furthermore, the middle layer cylinder body is a cylindrical structure.

[0010] Furthermore, the outer side of the middle layer cylinder body and the inner side of the outer layer cylinder body have a matching tooth-shaped structure, and the length of the tooth-shaped structure is arranged along the central length direction of the cylinder barrel.

[0011] Furthermore, the outer diameter of the cylinder barrel is 30 - 40 centimeters, and the diameter of the cavity is 25 - 30 centimeters.

[0012] The beneficial effects of the present utility model are as follows: Such a hydraulic support has the advantages that when the temperature rises, the cylinder barrel and the piston still cooperate well, ensuring the use effect; it is particularly suitable for large-diameter hydraulic supports with a diameter of 30 - 40 centimeters. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is a schematic cross-sectional structure diagram of the present utility model.

[0014] Figure 2 is Figure 1 the schematic cross-sectional structure diagram in the A - A direction in

[0015] Figure 3 is Figure 2 the enlarged view of part B in

[0016] Wherein: 1, cylinder barrel; 2, piston; 3, cavity; 11, outer cylinder; 12, inner cylinder; 13, middle cylinder; 131, tooth-shaped structure. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0017] The present utility model will be further described below with reference to the accompanying drawings.

[0018] As Figure 1 , 2 shown, a large-diameter hydraulic support includes an outer cylinder barrel 1 and a piston 2 inside the cylinder barrel. The cylinder barrel has a cavity 3 inside, and on the side of the cylinder barrel is a side wall. The piston is installed inside the cavity, and hydraulic oil is also filled inside the cavity. Its characteristics are: The cylinder barrel includes an outer cylinder 11 and an inner cylinder 12, and there is a copper-zinc alloy layer between the outer cylinder and the inner cylinder. The copper-zinc alloy layer is the middle cylinder 13, and the contact parts of the outer cylinder, middle cylinder, and inner cylinder are of a matching structure and are interference-fitted.

[0019] Since the present utility model is provided with a middle cylinder between the outer cylinder and the inner cylinder, and the middle cylinder is a copper-zinc alloy layer, when heated and expanded, the middle cylinder can inhibit the expansion of the outer cylinder, that is, reduce the expansion of the outer cylinder towards the cavity, achieving the effect that the cylinder barrel and the piston of the present utility model still cooperate well, and achieving the purpose of the present utility model.

[0020] Furthermore, the thickness of the middle cylinder is 2 - 3 millimeters.

[0021] Furthermore, the thickness of the inner cylinder is 3 - 5 millimeters.

[0022] The design of the above data of the present utility model has the effect that the cylinder barrel and the piston still cooperate better when heated.

[0023] Furthermore, the middle cylinder is of a cylindrical structure.

[0024] With such a setting of the present utility model, it also has the advantage of more reasonable design.

[0025] Furthermore, as Figure 3 shown, the outer side of the middle cylinder and the inner side of the outer cylinder have a matching tooth-shaped structure 131, and the length of the tooth-shaped structure is set along the central length direction of the cylinder barrel.

[0026] With such a setting of the present utility model, it also has the advantage of being more durable.

[0027] Furthermore, the outer diameter of the cylinder barrel is 30 - 40 cm, and the diameter of the cavity is 25 - 30 cm.

[0028] With such a setting of the present utility model, it is particularly suitable for large-diameter hydraulic supports.

[0029] The above are only specific embodiments of the present utility model, but the structural features of the present utility model are not limited thereto. Any changes or modifications made by those skilled in the art within the scope of the present utility model are covered by the patent scope of the present utility model.

Claims

1. A large diameter hydraulic support, comprising an outer cylinder and a piston in the cylinder, wherein the cylinder has a cavity inside and a side wall on the side of the cylinder, the piston is installed in the cavity, and the cavity is filled with hydraulic oil; the characteristics are: The cylinder comprises an outer layer cylinder and an inner layer cylinder, and a copper-zinc alloy layer is provided between the outer layer cylinder and the inner layer cylinder, the copper-zinc alloy layer is a middle layer cylinder, and the contact parts of the outer layer cylinder, the middle layer cylinder and the inner layer cylinder are a matching structure and an interference fit.

2. The large diameter hydraulic support according to claim 1 is characterized in that: The thickness of the middle cylinder is 2-3 mm.

3. The large diameter hydraulic support according to claim 2 is characterized in that: The thickness of the inner cylinder is 3-5 mm.

4. The large diameter hydraulic support according to claim 1, 2 or 3, characterized in that: The middle cylinder is a cylindrical structure.

5. The large diameter hydraulic support according to claim 1, 2 or 3, characterized in that: The outer side of the middle cylinder and the inner side of the outer cylinder have matching tooth-shaped structures, and the length of the tooth-shaped structures is set along the center length direction of the cylinder.

6. The large diameter hydraulic support according to claim 1, 2 or 3, characterized in that: The outer diameter of the cylinder is 30-40 cm, and the diameter of the cavity is 25-30 cm.

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