Durable hydraulic prop

Abstract

The utility model relates to the technical field of mechanical equipment, in particular to a durable hydraulic prop which comprises a hydraulic prop body, a plating layer is arranged outside the hydraulic prop body, the plating layer is a composite plating layer of a copper-tin alloy plating layer and a chromium plating layer, and a passivation zinc plating layer is further arranged outside the chromium plating layer. A hard chromium plating layer is arranged between the chromium plating layer and the copper-tin alloy bottom layer; or a milky white hard chromium plating layer is arranged between the chromium plating layer and the copper-tin alloy bottom layer. The hydraulic prop has the advantages of being more durable and free of dust adhesion.

Description

Technical Field

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

[0002] The hydraulic prop is one of the important equipment in the coal mining face, which plays a role in supporting the roof to form a movable underground coal mining space. The performance and service life underground of the hydraulic prop play a crucial role in controlling the operating cost of the coal industry. The environment in the coal mine is harsh, with a relatively high humidity, and the air contains various harmful gases such as SO 2 , H 2 S, CO 2 and gas, etc. Moreover, the water quality components in the mine are complex, and the water contains a large amount of metal ions such as Na + , K + , Fe 2+ , Fe 3+ and anions such as Cl - , SO 4 2- , especially the specific ions such as Cl - ions have an important influence on corrosion, which can cause pitting corrosion of the coating. Moreover, excessive dust in the mine adheres to the surface of the hydraulic support column, and corrosive substances such as S 2- in coal dissolve in the water film, aggravating the corrosion. Setting a coating outside the hydraulic prop can effectively reduce the corrosion of the harmful gases on the prop

[0003] In the prior art, the coating on the surface of the prop is generally a composite coating of a copper-tin alloy bottom layer and a chromium-plated coating. Such a coating has a certain anti-corrosion effect, but there is still room for improvement to make the coating on the surface of the prop have a better anti-corrosion effect, be more durable, and not adhere to dust. Summary of the Invention

[0004] The purpose of the utility model is to aim at the above-mentioned disadvantages and provide a more durable and dust-free hydraulic prop - a durable hydraulic prop.

[0005] The technical solution adopted by the utility model is: a durable hydraulic prop, including a hydraulic prop body, and the outside of the hydraulic prop body has a coating. The coating is a composite coating of a copper-tin alloy coating and a chromium-plated coating, and its feature is that there is also a passivated zinc coating outside the chromium-plated coating.

[0006] Furthermore, there is also a hard chromium coating between the chromium-plated coating and the copper-tin alloy coating.

[0007] Or, there is also a milky white chromium hard chromium coating between the chromium-plated coating and the copper-tin alloy coating.

[0008] Furthermore, the thicknesses of the copper-tin alloy coating, chromium plating, and passivated galvanized layer are 0.015 - 0.020 mm, 0.015 - 0.020 mm, and 0.012 - 0.018 mm respectively.

[0009] Furthermore, the thickness of the hard chromium coating is 0.015 - 0.020 mm.

[0010] The beneficial effects of the present utility model are as follows: Such a hydraulic support is more durable and does not adhere to dust. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 is a schematic cross-sectional structure diagram of the durable hydraulic support of the present utility model.

[0012] Figure 2 is Figure 1 an enlarged view of part A in

[0013] Wherein: 1. Hydraulic support body 21. Copper-tin alloy coating 22. Chromium plating 23. Passivated galvanized layer 241. Hard chromium coating 242. Milky white chromium hard chromium coating. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0014] The present utility model will be further described below with reference to the accompanying drawings.

[0015] As Figure 1 、 2 shown, a durable hydraulic support includes a hydraulic support body 1, and the outside of the hydraulic support body has a coating. The coating is a composite coating of a copper-tin alloy coating 21 and a chromium plating 22. The feature is that there is also a passivated galvanized layer 23 outside the chromium plating.

[0016] Since the present utility model adds a passivated galvanized layer outside the hydraulic support body, the passivated galvanized layer has a better effect of protecting the hydraulic support body and has better anti-corrosion effect on some corrosive materials, which can achieve the purpose of the present utility model; in addition, the passivated galvanized layer also has the effect of not easily adhering to dust.

[0017] Furthermore, there is also a hard chromium coating 241 between the chromium plating and the copper-tin alloy coating.

[0018] With such a setting of the present utility model, it also has a more durable effect.

[0019] Alternatively, there is also a milky white chromium hard chromium coating 242 between the chromium plating and the copper-tin alloy coating.

[0020] With such a setting of the present utility model, it also has a more durable effect.

[0021] Furthermore, the thicknesses of the copper-tin alloy coating, chromium plating, and passivated galvanized layer are 0.015 - 0.020 mm, 0.015 - 0.020 mm, and 0.012 - 0.018 mm respectively.

[0022] Furthermore, the thickness of the hard chromium coating is 0.015 - 0.020 mm.

[0023] Furthermore, the thickness of the milky white hard chromium coating is 0.015 - 0.020 mm.

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

[0025] 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 durable hydraulic prop, comprising a hydraulic prop body, the outer surface of the hydraulic prop body having a coating, the coating being a composite coating of a copper-tin alloy coating and a chrome coating, characterized in that: There is also a passivation zinc coating outside the chrome coating.

2. The durable hydraulic prop according to claim 1 is characterized in that: There is also a hard chrome layer between the chrome plating layer and the copper-tin alloy plating layer.

3. The durable hydraulic prop according to claim 1 is characterized in that: There is also a layer of milky white chrome hard chrome plating between the chrome plating body and the copper-tin alloy plating.

4. The durable hydraulic prop according to claim 1 is characterized in that: The thicknesses of the copper-tin alloy plating layer, the chrome plating layer and the passivation zinc plating layer are 0.015-0.020 mm, 0.015-0.020 mm and 0.012-0.018 mm respectively.

5. The durable hydraulic prop according to claim 2, characterized in that: The thickness of the hard chrome coating is 0.015-0.020 mm.

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