Hydraulic support setting force control system

Abstract

The utility model relates to a hydraulic support setting force control system. A hydraulic sensor is used for detecting the pressure of an oil inlet cavity of a jack oil cylinder. The hydraulic support controller receives pressure data from the hydraulic sensor; the hydraulic control speed regulating valve is arranged on an oil inlet path of the jack oil cylinder in series; the electro-hydraulic main valve is arranged on a hydraulic control line of the hydraulic control speed regulating valve in series, a setting force value is preset in the hydraulic support controller, and when pressure data, received by the hydraulic support controller, of the hydraulic sensor reaches 90% of the preset setting force value of the hydraulic support controller, the electro-hydraulic main valve is started. The hydraulic support controller controls the electro-hydraulic main valve to be communicated with a high-pressure position of a hydraulic control line of the hydraulic control speed regulating valve, so that the hydraulic control speed regulating valve opens a speed regulating mode; the hydraulic control one-way valve is directly connected with an oil inlet cavity of the jack oil cylinder and communicated with the oil inlet cavity, and a hydraulic control line of the hydraulic control one-way valve is connected with an oil outlet cavity of the jack oil cylinder. The lifting speed of the stand column is reduced through the hydraulic control speed regulating valve, and the initial supporting force of the hydraulic support is accurately controlled.

Description

Technical Field

[0001] The utility model relates to a hydraulic control system, in particular to an initial support force control system for a hydraulic support, belonging to a hydraulic control system used underground in a coal mine. Background Art

[0002] The hydraulic support is a structure used to control the mine pressure at the coal mining face. The pressure on the mine surface will act on the hydraulic support. The hydraulic support is supported by the jack cylinder. When the oil inlet chamber of the jack cylinder is filled with oil, the hydraulic support will rise to support the mine surface. When the oil return chamber of the jack cylinder is filled with oil, the hydraulic support will be retracted. During the column raising process of the mining hydraulic support, that is, during the process of the oil inlet chamber of the jack cylinder being filled with oil, whether the initial support force of the jack cylinder is insufficient or excessive, it will affect the support effect of the hydraulic support on the top of the coal mine. The control of the initial support force in the prior art is insufficient, resulting in poor support effect of the hydraulic support on the top of the coal mine. This situation needs to be solved. Utility Model Content

[0003] The utility model aims to provide a hydraulic support initial support force control system to solve the problem of insufficient or excessive initial support force in the column raising process of the mining hydraulic support in the prior art.

[0004] In order to solve the above problems, the initial support force control system of the hydraulic support involved in the utility model adopts the following technical solutions: a hydraulic support initial support force control system, including a jack cylinder, characterized in that the oil inlet chamber and the oil return chamber of the jack cylinder are connected to the hydraulic pump and the oil tank through a reversing valve, and also includes: a hydraulic sensor, the hydraulic sensor is used to detect the pressure of the oil inlet chamber of the jack cylinder; a hydraulic support controller, the hydraulic support controller is connected to the hydraulic sensor for transmission to receive pressure data from the hydraulic sensor; a hydraulically controlled speed regulating valve, the hydraulically controlled speed regulating valve is arranged in series on the oil inlet path of the jack cylinder, and the hydraulically controlled speed regulating valve is connected in series to the oil inlet path of the jack cylinder. The speed valve is located between the reversing valve and the jack cylinder; the electro-hydraulic main valve, the electro-hydraulic main valve is arranged in series on the hydraulic control line of the hydraulic control speed regulating valve, and the initial support force value is preset in the hydraulic support controller. When the pressure data of the hydraulic sensor received by the hydraulic support controller reaches 90% of the preset initial support force value of the hydraulic support controller, the hydraulic support controller controls the electro-hydraulic main valve to connect to the high pressure position of the hydraulic control line of the hydraulic control speed regulating valve so that the hydraulic control speed regulating valve starts the speed regulation mode; the hydraulic control check valve, the hydraulic control check valve is directly connected to the oil inlet chamber of the jack cylinder and connected to the oil inlet chamber, and the hydraulic control line of the hydraulic control check valve is connected to the oil outlet chamber of the jack cylinder.

[0005] The electro-hydraulic main valve is a three-position four-way electromagnetic reversing valve, and the hydraulic control line of the hydraulically controlled speed regulating valve is connected to the hydraulic pump and the oil tank through the reversal of the electro-hydraulic main valve.

[0006] The middle position function of the electro-hydraulic main valve is Y-type.

[0007] The reversing valve is a three-position four-way electromagnetic reversing valve.

[0008] The middle position function of the reversing valve is Y-type.

[0009] There are two jack cylinders, which are connected in parallel. The oil circuit coming out of the hydraulically controlled speed regulating valve is divided into two circuits, which are respectively connected to the oil inlet chambers of the two jack cylinders. The two corresponding jack cylinders are respectively provided with a hydraulically controlled one-way valve.

[0010] When the pressure of the jack cylinder is close to the preset initial support force, the hydraulic support controller of the utility model will control the electro-hydraulic main valve to open the speed control mode of the hydraulically controlled speed control valve, slow down the rising speed of the column, ensure that the pressure of the oil inlet chamber of the jack cylinder can reach the preset initial support force value, and realize precise control of the initial support force of the hydraulic support.

[0011] The electro-hydraulic main valve of the utility model is a three-position four-way solenoid reversing valve. The hydraulic control line of the hydraulically controlled speed regulating valve is connected to the hydraulic pump and the oil tank through the reversal of the electro-hydraulic main valve. The hydraulic control line is connected to the hydraulic pump or the oil tank through the reversal of the three-position four-way solenoid reversing valve, thereby controlling whether the hydraulically controlled speed regulating valve performs speed regulation. The control is simple and convenient.

[0012] The reversing valve of the utility model is a three-position four-way electromagnetic reversing valve, which is easy to control.

[0013] The utility model has two jack oil cylinders, which are connected in parallel and can supply oil to the two jack oil cylinders at the same time, thus saving system energy and synchronously controlling the initial supporting forces of the two jack oil cylinders. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solution of the embodiment of the utility model, the following is a brief introduction to the drawings required for use in the embodiment:

[0015] Figure 1 It is a hydraulic system diagram of an embodiment of the utility model;

[0016] Figure 2 This is the electrical control block diagram of the utility model. DETAILED DESCRIPTION

[0017] In order to make the technical purpose, technical solution and beneficial effects of the utility model clearer, the technical solution of the utility model is further described below in conjunction with the drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the utility model and are not used to limit the utility model, that is, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. The components of the embodiments of the utility model described and shown in the drawings can be arranged and designed in various different configurations.

[0018] The specific embodiment of the hydraulic support initial support force control system involved in the utility model is as follows: Figure 1 and Figure 2 In the figure, there are two jack cylinders 1, and the two jack cylinders 1 are connected in parallel. The reversing valve 2 is a three-position four-way electromagnetic reversing valve, and its middle position function is y-type and the middle position is pressure relief. The P port of the reversing valve 2 is connected to the hydraulic pump, and the O port is connected to the oil tank. One of the other two ports of the reversing valve is connected to the inlet of the hydraulically controlled speed regulating valve 3. The outlet of the hydraulically controlled speed regulating valve 3 is divided into two paths. These two paths are respectively connected to the oil inlet chambers of the two jack cylinders 1 through a hydraulically controlled one-way valve 4. The oil inlet chamber of the jack cylinder 1 is a rodless chamber. The outlets of the oil outlet chambers of the two jack cylinders 1 are connected to the last port of the reversing valve after merging. The hydraulic control line of the hydraulically controlled one-way valve 4 is connected to the oil outlet chamber of the jack cylinder, or it can be said that it is connected to the port connected to the reversing valve and the oil outlet chamber of the jack cylinder 1.

[0019] An electro-hydraulic main valve 5 is arranged in series on the hydraulic control line of the hydraulic control speed regulating valve 3. The hydraulic control port of the hydraulic control speed regulating valve 3 is connected to the oil tank and the hydraulic pump through the electro-hydraulic main valve 5. The electro-hydraulic main valve 5 is a three-position four-way electromagnetic reversing valve. The electro-hydraulic main valve 5 is a y-type. The P port of the electro-hydraulic main valve 5 is connected to the hydraulic pump, the O port is connected to the oil tank, the other port is connected to the hydraulic control port of the hydraulic control speed regulating valve 3, and the remaining port is in a blocked state.

[0020] A hydraulic support controller 6 and a hydraulic sensor 7 are also provided in the system. The hydraulic sensor 7 is used to detect the pressure of the oil inlet chamber of the jack cylinder. The hydraulic support controller 6 is a commercially available component and is a mature component. It can receive pressure data from the hydraulic sensor 7, and an initial support force value is preset in the hydraulic support controller 6. When the pressure data of the hydraulic sensor received by the hydraulic support controller reaches 90% of the preset initial support force value of the hydraulic support controller, the hydraulic support controller 6 will control the electro-hydraulic main valve 5 to open. After the electro-hydraulic main valve 5 is opened, the hydraulic-controlled speed regulating valve 3 will be controlled to start the speed regulation mode. In other words, the hydraulic support controller 6 will control the reversal of the electro-hydraulic main valve 5 so that the hydraulic control port of the hydraulic-controlled speed regulating valve 3 is connected to the P port of the electro-hydraulic main valve 5, that is, it is connected to the hydraulic pump through the reversing valve. The hydraulic-controlled speed regulating valve 3 starts the speed regulation mode, so that the oil inlet of the inlet chamber of the jack cylinder 1 becomes slow, so that its pressure is accurately close to the required initial support force.

[0021] The electro-hydraulic main valve in the above embodiment is a three-position four-way electromagnetic reversing valve. In other embodiments, any valve that can electrically control the direction of the hydraulic control line of the hydraulic control speed regulating valve 3 and the high hydraulic end can be used, such as a two-position four-way reversing valve or a two-position three-way reversing valve.

[0022] The hydraulic control line of the hydraulically controlled speed regulating valve 3 in the above embodiment is controlled by the hydraulic pump and oil tank of the system, and a high hydraulic source and a low hydraulic source may also be separately provided to control the system.

[0023] The electro-hydraulic main valve in the above embodiment is connected to the hydraulic pump and the oil tank via the reversing valve, and in other embodiments, it may also be directly connected to the hydraulic pump and the oil tank.

[0024] The mid-position function of the electro-hydraulic main valve in the above-mentioned embodiment is Y-type, and it may be other mid-position functions in other embodiments.

[0025] The reversing valve in the above embodiment is a three-position four-way electromagnetic reversing valve, and in other embodiments it may be a reversing valve of other forms.

[0026] The middle position function of the reversing valve in the above-mentioned embodiment is Y-type, which can release pressure when not in operation. In other embodiments, it can also be other middle position functions that can release pressure.

[0027] There are two jack cylinders in the above embodiment, and the two jack cylinders are connected in parallel and can be controlled simultaneously. In other embodiments, different hydraulic circuits can also be set up and controlled separately.

[0028] Finally, it should be noted that the above embodiments are only used to illustrate but not to limit the technical solutions of the present invention, and any equivalent substitutions of the present invention and any modifications or partial substitutions that do not depart from the spirit and scope of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. A hydraulic support initial support force control system, including a jack cylinder, characterized in that: The oil inlet chamber and the oil return chamber of the jack cylinder are connected to the hydraulic pump and the oil tank through a reversing valve, and also include: Hydraulic sensor: The hydraulic sensor is used to detect the oil inlet chamber pressure of the jack cylinder; A hydraulic support controller, the hydraulic support controller is connected to the hydraulic sensor for receiving pressure data from the hydraulic sensor; The hydraulically controlled speed regulating valve is arranged in series on the oil inlet of the jack cylinder, and the hydraulically controlled speed regulating valve is located between the reversing valve and the jack cylinder; The electro-hydraulic main valve is arranged in series on the hydraulic control line of the hydraulic control speed regulating valve. The initial support force value is preset in the hydraulic support controller. When the pressure data of the hydraulic sensor received by the hydraulic support controller reaches 90% of the preset initial support force value of the hydraulic support controller, the hydraulic support controller controls the electro-hydraulic main valve to connect to the high pressure position of the hydraulic control line of the hydraulic control speed regulating valve so that the hydraulic control speed regulating valve starts the speed regulating mode; The hydraulically controlled one-way valve is directly connected to the oil inlet chamber of the jack cylinder and communicates with the oil inlet chamber, and the hydraulic control line of the hydraulically controlled one-way valve is connected to the oil outlet chamber of the jack cylinder.

2. The hydraulic support initial support force control system according to claim 1, characterized in that: The electro-hydraulic main valve is a three-position four-way electromagnetic reversing valve, and the hydraulic control line of the hydraulically controlled speed regulating valve is connected to the hydraulic pump or the oil tank through the reversal of the electro-hydraulic main valve.

3. The hydraulic support initial support force control system according to claim 2, characterized in that: The middle position function of the electro-hydraulic main valve is Y-type.

4. The hydraulic support initial support force control system according to claim 3, characterized in that: The reversing valve is a three-position four-way electromagnetic reversing valve.

5. The hydraulic support initial support force control system according to claim 4, characterized in that: The middle position function of the reversing valve is Y-type.

6. The hydraulic support initial support force control system according to any one of claims 1 to 5, characterized in that: There are two jack cylinders, which are connected in parallel. The oil circuit coming out of the hydraulically controlled speed regulating valve is divided into two circuits, which are respectively connected to the oil inlet chambers of the two jack cylinders. The two corresponding jack cylinders are respectively provided with a hydraulically controlled one-way valve.

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