Oil drainage device for large cavity of oil cylinder of drilling machine

Abstract

The utility model provides an oil drainage device of a drilling machine oil cylinder large cavity, which belongs to the field of engineering machinery and comprises a propulsion oil cylinder, a hydraulic control valve, an oil tank, a propulsion control valve and an oil source, the propulsion oil cylinder is respectively connected with the hydraulic control valve and the propulsion control valve, the hydraulic control valve is respectively connected with the oil tank and the propulsion control valve, and the oil tank is connected with the propulsion control valve. The oil source is connected with the propulsion control valve. By arranging the hydraulic control valve, the oil return flow of the propulsion control valve is reduced, so that the propulsion control valve becomes smaller, the installation is convenient, and the cost is saved.

Description

Technical Field

[0001] The utility model relates to the field of engineering machinery, in particular to an oil drain device for a large cavity of a drilling rig oil cylinder. Background Art

[0002] Because the propulsion speed of the propulsion cylinder of the rock drilling rig is relatively high, when the small cavity is filled with oil, the oil output of the large cavity is generally multiple of that of the small cavity (based on the area ratio of the large and small cavities). Therefore, when selecting a control valve, a control valve with a larger flow rate should be selected. In the prior art, the control valve should be selected according to the maximum oil return volume of the large cavity. The selection of a control valve with a large flow rate not only increases the cost, but also causes the problem of inconvenient installation due to the enlargement of the control valve body. Therefore, a large-cavity oil drain device for the drilling rig oil cylinder is needed. Utility Model Content

[0003] The purpose of the utility model is to provide an oil drain device for a large-chamber oil cylinder of a drilling rig, which solves the technical problem that the existing large-flow control valve is inconvenient to install. The utility model reduces the return oil volume of the propulsion control valve by setting a hydraulic control valve, thereby making the propulsion control valve smaller, facilitating installation and saving costs.

[0004] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0005] The invention discloses an oil drain device for a large-cavity oil cylinder of a drilling rig, comprising a propulsion oil cylinder, a hydraulic control valve, an oil tank, a propulsion control valve and an oil source, wherein the propulsion oil cylinder is respectively connected to the hydraulic control valve and the propulsion control valve, the hydraulic control valve is respectively connected to the oil tank and the propulsion control valve, the oil tank is connected to the propulsion control valve, and the oil source is connected to the propulsion control valve.

[0006] Furthermore, the propulsion control valve is respectively provided with an oil outlet, an oil return port, an oil inlet and an oil port.

[0007] Furthermore, the hydraulic control valve is respectively provided with a first oil port, a second oil port and a third oil port.

[0008] Further, the small oil cylinder chamber of the propulsion oil cylinder is connected to the oil outlet of the propulsion control valve, and the oil outlet of the propulsion control valve is connected to the third oil port of the hydraulic control valve.

[0009] Furthermore, the large oil cylinder chamber of the propulsion oil cylinder is respectively connected to the oil return port of the propulsion control valve and the first oil port of the hydraulic control valve.

[0010] Further, the oil source is connected to the oil inlet of the propulsion control valve.

[0011] Further, the oil tank is connected to the oil port of the propulsion control valve and the second oil port of the hydraulic control valve respectively.

[0012] The utility model has the following beneficial effects due to the adoption of the above technical solution:

[0013] The utility model reduces the oil return flow of the propulsion control valve by arranging the hydraulic control valve, thereby making the propulsion control valve smaller, facilitating installation and saving costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the oil drain device of the utility model;

[0015] Figure 2 It is a three-dimensional diagram of the hydraulic control valve of the utility model;

[0016] Figure 3 It is a schematic diagram of the hydraulic control valve of the utility model.

[0017] In the attached figure, 1-thrust cylinder, 2-hydraulic control valve, A1-first oil port, A2-second oil port, X-third oil port, 3-oil tank, 4-thrust control valve, A-oil outlet, B-oil return port, C-oil inlet, D-oil port, 5-oil source. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail with reference to the accompanying drawings and preferred embodiments. However, it should be noted that many details listed in the specification are only for the purpose of enabling readers to have a thorough understanding of one or more aspects of the utility model, and these aspects of the utility model can be realized even without these specific details.

[0019] like Figure 1-3 As shown, an oil drain device for a large-chamber oil cylinder of a drilling rig comprises a propulsion oil cylinder 1, a hydraulic control valve 2, an oil tank 3, a propulsion control valve 4 and an oil source 5. The propulsion oil cylinder 1 is connected to the hydraulic control valve 2 and the propulsion control valve 4 respectively, the hydraulic control valve 2 is connected to the oil tank 3 and the propulsion control valve 4 respectively, the oil tank 3 is connected to the propulsion control valve 4, and the oil source 5 is connected to the propulsion control valve 4. The utility model reduces the return oil flow of the propulsion control valve by setting the hydraulic control valve, thereby making the propulsion control valve smaller, facilitating installation and saving costs.

[0020] In the embodiment of the utility model, the propulsion control valve 4 is respectively provided with an oil outlet A, an oil return port B, an oil inlet C and an oil port D. The hydraulic control valve 2 is respectively provided with a first oil port A1, a second oil port A2 and a third oil port X. The small oil cylinder chamber of the propulsion cylinder 1 is connected to the oil outlet A of the propulsion control valve 4, and the pressure oil enters the small oil cylinder chamber of the propulsion cylinder 1 from the oil outlet A of the propulsion control valve 4. The oil outlet A of the propulsion control valve 4 is connected to the third oil port X of the hydraulic control valve 2. When the pressure oil enters the small oil cylinder chamber of the propulsion cylinder 1 from the oil outlet A of the propulsion control valve 4, the pressure oil is controlled to push open the third oil port X of the hydraulic control valve 2. The large cylinder chamber of the propulsion cylinder 1 is respectively connected to the oil return port B of the propulsion control valve 4 and the first oil port A1 of the hydraulic control valve 2. A part of the pressure oil in the large cylinder chamber of the propulsion cylinder 1 flows back to the propulsion control valve 4 through the oil return port B of the propulsion control valve 4, and another part of the pressure oil in the large cylinder chamber of the propulsion cylinder 1 flows from the first oil port A1 of the hydraulic control valve 2 to the hydraulic control valve 2.

[0021] In the embodiment of the utility model, the oil source 5 is connected to the oil inlet C of the propulsion control valve 4, and the pressure oil in the oil source 5 enters the propulsion control valve 4 through the oil inlet C of the propulsion control valve 4. The oil tank 3 is connected to the oil port D of the propulsion control valve 4 and the second oil port A2 of the hydraulic control valve 2 respectively, and the pressure oil in the hydraulic control valve 2 enters the oil tank 3 from the second oil port A2 of the hydraulic control valve 2.

[0022] How it works

[0023] The pressure oil in the oil source 5 enters the propulsion control valve 4 from the oil inlet C of the propulsion control valve 4, and then enters the small cylinder chamber of the propulsion cylinder 1 through the oil outlet A of the propulsion control valve 4. When the small cylinder chamber of the propulsion cylinder 1 enters oil, the pressure oil is controlled to push open the hydraulic control valve 2. A part of the pressure oil in the large cylinder chamber of the propulsion cylinder 1 flows back to the propulsion control valve 4 through the oil return port B of the propulsion control valve 4, and another part of the pressure oil in the large cylinder chamber of the propulsion cylinder 1 flows from the first oil port A1 of the hydraulic control valve 2 to the hydraulic control valve 2, and the pressure oil in the hydraulic control valve 2 enters the oil tank 3 from the second oil port A2 of the hydraulic control valve 2.

[0024] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. An oil drain device for a large chamber of a drilling rig oil cylinder, characterized in that: The invention comprises a propulsion oil cylinder (1), a hydraulic control valve (2), an oil tank (3), a propulsion control valve (4) and an oil source (5); the propulsion oil cylinder (1) is connected to the hydraulic control valve (2) and the propulsion control valve (4) respectively; the hydraulic control valve (2) is connected to the oil tank (3) and the propulsion control valve (4) respectively; the oil tank (3) is connected to the propulsion control valve (4); and the oil source (5) is connected to the propulsion control valve (4).

2. The oil drain device for a large chamber of a drilling rig oil cylinder according to claim 1, characterized in that: The propulsion control valve (4) is respectively provided with an oil outlet (A), an oil return port (B), an oil inlet (C) and an oil port (D).

3. The oil drain device for a large chamber of a drilling rig oil cylinder according to claim 1, characterized in that: The hydraulic control valve (2) is respectively provided with a first oil port (A1), a second oil port (A2) and a third oil port (X).

4. The oil drain device for a large chamber of a drilling rig oil cylinder according to claim 1, characterized in that: The small oil cylinder chamber of the propulsion oil cylinder (1) is connected to the oil outlet (A) of the propulsion control valve (4), and the oil outlet (A) of the propulsion control valve (4) is connected to the third oil port (X) of the hydraulic control valve (2).

5. The oil drain device for a large chamber of a drilling rig oil cylinder according to claim 1, characterized in that: The large oil cylinder chamber of the propulsion oil cylinder (1) is respectively connected to the oil return port (B) of the propulsion control valve (4) and the first oil port (A1) of the hydraulic control valve (2).

6. The oil drain device for a large chamber of a drilling rig oil cylinder according to claim 1, characterized in that: The oil source (5) is connected to the oil inlet (C) of the propulsion control valve (4).

7. The oil drain device for a large chamber of a drilling rig oil cylinder according to claim 1, characterized in that: The oil tank (3) is respectively connected to the oil port (D) of the propulsion control valve (4) and the second oil port (A2) of the hydraulic control valve (2).

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