Hydraulic support multi-stage setting force control system

Abstract

The utility model relates to a multistage setting force control system for a hydraulic support. A hydraulic sensor is used for detecting the pressure of an oil inlet cavity of a jack oil cylinder; the hydraulic support controller is in transmission connection with the hydraulic sensor to receive pressure data from the hydraulic sensor; an inlet of each overflow loop is connected with a corresponding port of the reversing valve, an outlet of each overflow loop is connected with the oil tank, each overflow loop comprises an overflow valve with a hydraulic control stop valve, the electromagnetic pilot operated valve is arranged on a hydraulic control line of the hydraulic control stop valve in series, and a needed initial supporting force value is preset in the hydraulic support controller. The preset initial supporting force value is the same as the overflow port pressure of any overflow valve, and when the pressure data, received by the hydraulic support controller, of the hydraulic sensor is equal to the preset initial supporting force value of the hydraulic support controller, the hydraulic support controller controls the corresponding electromagnetic pilot operated valve to be opened; the electromagnetic pilot valves are opened to communicate with hydraulic control lines of the corresponding hydraulic control stop valves; the overflow valve is used for ensuring that the pressure of the oil inlet cavity of the jack oil cylinder can reach the required initial supporting force, and effective control over the initial supporting force is achieved.

Description

Technical Field

[0001] The utility model relates to a hydraulic control system, in particular to a hydraulic support multi-stage initial support force control system, belonging to a hydraulic control system used in underground coal mines. 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 multi-stage 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 multi-stage initial support force control system of the hydraulic support involved in the utility model adopts the following technical solutions: a multi-stage initial support force control system of the hydraulic support, including a jack cylinder, 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:

[0005] Hydraulic sensor: The hydraulic sensor is used to detect the oil inlet chamber pressure of the jack cylinder;

[0006] A hydraulic support controller, the hydraulic support controller is connected to the hydraulic sensor for receiving pressure data from the hydraulic sensor;

[0007] The overflow unit includes at least three overflow circuits, each overflow circuit is connected in parallel, the inlet of each overflow circuit is connected to the corresponding port of the reversing valve, the outlet of each overflow circuit is connected to the oil tank, the overflow circuit includes an overflow valve with a hydraulically controlled stop valve, and the overflow port pressures of each overflow valve are different;

[0008] Solenoid pilot valve, the solenoid pilot valve is arranged in series on the hydraulic control line of the hydraulic control stop valve, the required initial support force value is preset in the hydraulic support controller, the preset initial support force value is the same as the overflow port pressure of any overflow valve, when the pressure data of the hydraulic sensor received by the hydraulic support controller is equal to the preset initial support force value of the hydraulic support controller, the hydraulic support controller controls the corresponding solenoid pilot valve to open, and the solenoid pilot valve opens the hydraulic control line connecting the corresponding hydraulic control stop valve;

[0009] 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. The hydraulic control line of the hydraulically controlled one-way valve is connected to the oil outlet chamber of the jack cylinder.

[0010] The electromagnetic pilot valve is a two-position three-way electromagnetic reversing valve, and the hydraulic control line of the hydraulic control stop valve is connected to the hydraulic pump or the oil tank through the reversing of the electromagnetic pilot valve.

[0011] The hydraulically controlled stop valve is a two-position, two-way normally closed hydraulically controlled reversing valve.

[0012] The reversing valve is a three-position four-way electromagnetic reversing valve.

[0013] The middle position function of the reversing valve is Y-type.

[0014] 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.

[0015] The overflow unit of the utility model comprises at least three overflow circuits, each overflow circuit is connected in parallel, and the overflow pressures of the overflow valves of different overflow units are different, and different overflow pressures correspond to different initial supporting forces. When the required initial supporting force is reached, the corresponding overflow valve is opened to realize multi-stage control of the initial supporting force, and the hydraulically controlled one-way valve maintains the pressure to ensure that the pressure of the oil inlet chamber of the jack cylinder will not fluctuate when there is a drop, and the overflow valve is used to stabilize the pressure of the oil inlet chamber of the jack cylinder to ensure that the pressure of the oil inlet chamber of the jack cylinder can reach the inlet pressure of the overflow valve, that is, to ensure that the pressure of the oil inlet chamber of the jack cylinder can reach the required initial supporting force, thereby realizing effective control of the initial supporting force.

[0016] The reversing valve of the utility model is a three-position four-way electromagnetic reversing valve, which is easy to control.

[0017] 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

[0018] 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:

[0019] Figure 1 It is a hydraulic system diagram of an embodiment of the utility model;

[0020] Figure 2 for Figure 1 System diagram of the overflow unit;

[0021] Figure 3This is the electrical control block diagram of the utility model. DETAILED DESCRIPTION

[0022] 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.

[0023] The specific embodiment of the multi-stage initial support force control system of the hydraulic support involved in the utility model is as follows: Figure 1 , Figure 2 and Figure 3 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 divided into three routes, of which two rounds and two routes 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, and the last route is connected to the inlet of the overflow unit. 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.

[0024] The overflow unit has four overflow circuits, each overflow circuit is connected in parallel, and the inlet of each overflow circuit is connected to the corresponding port of the reversing valve. The so-called corresponding port refers to the port of the reversing valve connected to the oil inlet chamber of the jack cylinder 1. The outlet of each overflow circuit is connected to the oil tank. The overflow circuit has an overflow valve 8 with a hydraulically controlled stop valve. The overflow port pressure of each overflow valve 8 is different. An electromagnetic pilot valve 5 is connected in series to the hydraulic control line of the hydraulically controlled stop valve 3. The hydraulic control port of the hydraulically controlled stop valve 3 is connected to the oil tank and the hydraulic pump through the electromagnetic pilot valve 5. The electromagnetic pilot valve 5 here is a two-position three-way electromagnetic reversing valve. The long-through port of the electromagnetic pilot valve 5 is connected to the hydraulic control port of the hydraulically controlled stop valve 3, and the other two ports of the electromagnetic pilot valve 5 are connected to the hydraulic pump and the oil tank respectively.

[0025] 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. In addition, an initial support force value is preset in the hydraulic support controller 6. This initial support force value is set according to needs. The set initial support force value is the same as the overflow pressure of an overflow valve. When the pressure data of the hydraulic sensor received by the hydraulic support controller is equal to the preset initial support force value of the hydraulic support controller, the hydraulic pressure is increased. The support controller 6 will control the electromagnetic pilot valve 5 to open. After the electromagnetic pilot valve 5 is opened, the hydraulic control line of the hydraulic control stop valve 3 will be connected to the hydraulic pump, and the overflow valve 8 will start to work and open the overflow mode. In other words, the hydraulic support controller 6 will control the electromagnetic pilot valve 5 to change direction, so that the hydraulic control port of the hydraulic control stop valve 3 is connected to the outlet of the hydraulic pump through the electromagnetic pilot valve 5, and the overflow valve 8 is opened. The outlet pressure of the hydraulic pump is determined, that is, the same as the required initial support force. By replacing the preset initial support force value and opening different overflow valves, multi-level control of the initial support force can be achieved. The hydraulic control one-way valve can maintain pressure to prevent fluctuations in the oil inlet chamber of the jack cylinder 1.

[0026] The electromagnetic pilot valve in the above embodiment is a two-position three-way electromagnetic reversing valve. In other embodiments, any valve that can electrically control the reversal of the hydraulic control line of the hydraulic stop valve and the high hydraulic end and the low hydraulic end can be used, such as a three-position four-way electromagnetic reversing valve.

[0027] The hydraulic control line of the hydraulically controlled stop valve in the above embodiment is controlled by the hydraulic pump of the system, and a high hydraulic pressure source may also be separately provided for control.

[0028] 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.

[0029] 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.

[0030] 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.

[0031] The hydraulically controlled stop valve in the above embodiment is a two-position, two-way normally closed hydraulically controlled reversing valve.

[0032] 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 multi-stage initial support force control system for a hydraulic support, comprising 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 overflow unit includes at least three overflow circuits, each overflow circuit is connected in parallel, the inlet of each overflow circuit is connected to the corresponding port of the reversing valve, the outlet of each overflow circuit is connected to the oil tank, the overflow circuit includes an overflow valve with a hydraulically controlled stop valve, and the overflow port pressures of each overflow valve are different; Solenoid pilot valve, the solenoid pilot valve is arranged in series on the hydraulic control line of the hydraulic control stop valve, the required initial support force value is preset in the hydraulic support controller, the preset initial support force value is the same as the overflow port pressure of any overflow valve, when the pressure data of the hydraulic sensor received by the hydraulic support controller is equal to the preset initial support force value of the hydraulic support controller, the hydraulic support controller controls the corresponding solenoid pilot valve to open, and the solenoid pilot valve opens the hydraulic control line connecting the corresponding hydraulic control stop valve; 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. The hydraulic control line of the hydraulically controlled one-way valve is connected to the oil outlet chamber of the jack cylinder.

2. The multi-stage initial support force control system of the hydraulic support according to claim 1 is characterized in that: The electromagnetic pilot valve is a two-position three-way electromagnetic reversing valve, and the hydraulic control line of the hydraulic control stop valve is connected to the hydraulic pump or the oil tank through the reversing of the electromagnetic pilot valve.

3. The multi-stage initial support force control system of the hydraulic support according to claim 2 is characterized in that: The hydraulically controlled stop valve is a two-position, two-way normally closed hydraulically controlled reversing valve.

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

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

6. The multi-stage initial support force control system of a hydraulic support 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.

Images