An electro-hydraulic controlled reversing valve device for a mining hydraulic support

Abstract

The present invention relates to an electro-hydraulic controlled reversing valve device for a mining hydraulic support, and its technical characteristics are: the main liquid inlet pipe is connected to the upper chamber of the liquid inlet cylinder through a transducer valve, the main liquid inlet pipe is connected to the liquid replenishing valve through a filter, and the underground main liquid inlet pipe is also connected to the lower chamber of the liquid return cylinder and the main valve; the two valve cores of the pilot valve are connected to the transducer valve, the liquid replenishing valve and the liquid discharge valve, one pipeline of the pilot valve is connected to the underground main liquid return pipe through a one-way valve, and the other pipeline is connected to the liquid replenishing valve, the other end of the liquid replenishing valve and the lower chamber of the liquid inlet cylinder are connected to the electromagnetic pilot valve and the main valve through a one-way valve, and the main valve is also connected to the liquid discharge valve, the upper chamber of the liquid return cylinder and the filter through the electromagnetic pilot valve, the one-way valve, and the filter is connected to the lower chamber of the liquid inlet cylinder through the one-way valve. The present invention is reasonably designed, which greatly reduces the influence of the quality of the mining emulsion on the electromagnetic pilot valve in the electro-hydraulic controlled reversing valve, and improves the service life of the electromagnetic pilot valve.

Description

Technical Field

[0001] The invention belongs to the technical field of coal mine automation, and relates to a hydraulic support control device, in particular to an electro-hydraulic controlled reversing valve device for a mining hydraulic support. Background Art

[0002] At present, with the popularization of automated working faces in coal mines, the valves used in hydraulic supports for coal mines have gradually been replaced by electro-hydraulic control instead of the original manual control method.

[0003] The hydraulic support is usually controlled by a hydraulic controller to control the electro-hydraulic control reversing valve. The electro-hydraulic control reversing valve consists of two parts: the electromagnetic pilot valve and the main valve. In order to ensure the normal operation of the electromagnetic pilot valve, high requirements are placed on the cleanliness of the working medium (emulsion) used. However, in actual work, there are usually no requirements for the cleanliness of the emulsion. In addition, some coal mines do not have enough knowledge and control over the cleanliness of the emulsion in the electro-hydraulic control system. Therefore, a large amount of impurities often exist in the emulsion. These emulsions with a large amount of impurities enter the electro-hydraulic control reversing valve, which will cause damage to the pilot valve and reduce the service life of the product. Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art and provide an electro-hydraulic controlled reversing valve device for a mining hydraulic support, which solves the influence of emulsion on the electromagnetic pilot valve by adopting a pilot valve to control the internal circulation of liquid.

[0005] The present invention solves the existing technical problems by adopting the following technical solutions:

[0006] A mining hydraulic support electro-hydraulic control reversing valve device, comprising a pilot valve, a transducer valve, a liquid inlet cylinder, a liquid return cylinder, a liquid replenishing valve, a liquid discharge valve, four one-way valves and two filters; a downhole main liquid inlet pipe is connected to the upper chamber of the liquid inlet cylinder through the transducer valve, the downhole main liquid inlet pipe is connected to the liquid replenishing valve through the first filter, and the downhole main liquid inlet pipe is also connected to the lower chamber of the liquid return cylinder and the main valve; a valve core of the pilot valve is connected to the transducer valve and controls it, and another valve core of the pilot valve is respectively connected to the liquid replenishing valve and the liquid discharge valve and controls them, and one pipeline of the pilot valve is connected to the transducer valve through the first filter. The fourth one-way valve is connected to the main return pipe downhole, and another pipeline of the pilot valve is connected to the liquid replenishment valve. The other end of the liquid replenishment valve and the lower chamber of the liquid inlet cylinder are both connected to the liquid inlet end of the third one-way valve. The liquid outlet end of the third one-way valve is connected to the main valve through an electromagnetic pilot valve, and the main valve is connected to and controls the hydraulic support; the main valve is also connected to the liquid inlet end of the second one-way valve through the electromagnetic pilot valve, and the liquid outlet end of the second one-way valve is connected to the drain valve, the upper chamber of the liquid return cylinder and the second filter, and the other end of the second filter is connected to the lower chamber of the liquid inlet cylinder through the first one-way valve.

[0007] Furthermore, the liquid inlet cylinder and the liquid return cylinder are respectively installed with a liquid inlet position sensor and a liquid return position sensor, which are both connected to the bracket controller and transmit the detected liquid level to the bracket controller, and the bracket controller controls the two-way valve core action of the pilot valve according to the liquid level.

[0008] Furthermore, the first filter and the second filter are both 25 μm filters.

[0009] The advantages and positive effects of the present invention are:

[0010] 1. The present invention connects the pilot valve with the transducer valve, the liquid replenishing valve and the liquid draining valve, and adds two filters to the internal circulation of the pilot valve control liquid. This method of using the pilot valve to control the internal circulation of the liquid greatly reduces the influence of the quality of the mining emulsion on the electromagnetic pilot valve in the electro-hydraulic control reversing valve, reduces the damage rate of the electromagnetic pilot valve, and increases the service life of the electromagnetic pilot valve.

[0011] 2. The present invention installs a liquid inlet position sensor and a liquid return position sensor on the liquid inlet cylinder and the liquid return cylinder respectively, and sends the detected liquid level to the bracket controller, which controls the operation of the transducer valve, the liquid replenishing valve and the liquid draining valve to realize the fully automatic control function of liquid inlet and liquid replenishment, and the control is flexible, accurate and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural diagram of the electro-hydraulic controlled reversing valve device of the mining hydraulic support of the present invention.

[0013] 1-the fourth one-way valve, 2-the transducer valve, 3-the first filter, 4-the pilot valve, 5-the liquid replenishing valve, 6-the liquid inlet position sensor, 7-the liquid inlet cylinder, 8-the first one-way valve, 9-the second filter, 10-the third one-way valve, 11-the second one-way valve, 12-the drain valve, 13-the liquid return cylinder, 14-the liquid return position sensor. DETAILED DESCRIPTION

[0014] The embodiments of the present invention are further described in detail below with reference to the accompanying drawings.

[0015] A mine hydraulic support electro-hydraulic control reversing valve device, such as Figure 1As shown, it includes a pilot valve 4, a transducer valve 2, a liquid inlet cylinder 7, a liquid return cylinder 13, a liquid replenishing valve 5, a liquid discharge valve 12, a first non-return valve 8, a second non-return valve 11, a third non-return valve 10, a fourth non-return valve 1, a first filter 3 and a second filter 9. The downhole main liquid inlet pipe is connected to the upper cavity of the liquid inlet cylinder 7 through the transducer valve 2, and the downhole main liquid inlet pipe is connected to the liquid replenishing valve 5 through the first filter 3. At the same time, the downhole main liquid inlet pipe is also connected to the lower cavity of the liquid return cylinder 14 and the main valve. One valve core of the pilot valve 4 is connected to the transducer valve 2 for controlling its action, and the other valve core of the pilot valve 4 is respectively connected to the liquid replenishment valve 5 and the liquid discharge valve 12 for controlling its action. One pipeline of the pilot valve 4 is connected to the downhole main liquid return pipe through the fourth one-way valve 1, and the fourth one-way valve 1 realizes the protection function of the pilot valve 4; another pipeline of the pilot valve 4 is connected to the liquid replenishment valve 5, and the other end of the liquid replenishment valve 5 and the lower chamber of the liquid inlet cylinder 7 are respectively connected to the liquid inlet end of the third one-way valve 10, and the liquid outlet end of the one-way valve 10 is connected to the main valve through the electromagnetic pilot valve, and the main valve is connected to the hydraulic support. The liquid inlet end of the second one-way valve 2 is connected to the main valve through the electromagnetic pilot valve, and the liquid outlet end of the second one-way valve 8 is connected to the liquid discharge valve 12, the upper chamber of the liquid return cylinder 13 and the second filter 9, and the other end of the second filter 9 is connected to the lower chamber of the liquid inlet cylinder 7 through the first one-way valve 8.

[0016] A liquid inlet position sensor 6 and a liquid return position sensor 14 are installed on the liquid inlet cylinder 7 and the liquid return cylinder 14 respectively. The liquid inlet position sensor 6 and the liquid return position sensor 14 transmit the detected liquid levels of the liquid inlet cylinder 7 and the liquid return cylinder 14 to the bracket controller. The bracket controller controls the action of the pilot valve 4 after analysis, controls the action of the transducer valve 2 through one valve core of the pilot valve 4, and controls the action of the liquid replenishing valve 5 and the liquid drain valve 12 through another valve core of the pilot valve 4.

[0017] In this embodiment, the first filter 3 and the second filter 9 are both 25 μm filters.

[0018] The working principle of the present invention is as follows: the high-pressure liquid in the downhole main liquid inlet pipe enters the liquid inlet cylinder 7 through the transducer valve 2. The areas on both sides of the piston in the liquid inlet cylinder 7 are equal, so the system pressure is equivalently transmitted to the emulsion in the closed system, making the closed system pressure the same as the downhole pressure. When the pilot valve 4 is actuated, the high-pressure liquid pushes the liquid inlet cylinder 7, causing the emulsion at the rear end of the liquid inlet cylinder 7 to pass through the third one-way valve 10, and then drive the main valve core to open through the electromagnetic pilot valve; when the pilot valve 4 is closed, the emulsion that drives the main valve core to open pushes the return liquid cylinder 13 to move through the second one-way valve 11, causing the emulsion at the rear end of the return liquid cylinder 13 to be discharged into the downhole main return liquid pipeline through the transducer valve 2. The specific process is as follows:

[0019] The working route of the pilot valve 4 is: main liquid inlet → transducer valve 2 → upper chamber of liquid inlet cylinder 7 → third one-way valve 10 → electromagnetic pilot valve → main valve.

[0020] The working route of the pilot valve 4 when it loses power is: high-pressure liquid in the main valve → main valve → electromagnetic pilot valve → second one-way valve 11 → upper chamber of the return liquid piston 13 → transducer valve 2 → main return liquid.

[0021] After the pilot valve 4 has performed actions for many times, at least one piston in the inlet cylinder 7 or the return cylinder 13 moves to the limit position, triggering the action of the inlet position sensor 6 or the return position sensor 14. At this time, the liquid replenishment action needs to be started to push the pistons in the inlet cylinder 7 and the return cylinder 13 to the initial position.

[0022] When the position sensor signal is sent to the bracket controller, the bracket controller drives the valve core of the pilot valve 4 to open and controls the action of the transducer valve 2. The high-pressure liquid passes through the transducer valve 2 to push the piston in the return cylinder 13 to move to the initial position; the liquid in the upper chamber of the return cylinder 13 enters the inlet cylinder 7 through the filter 9 and the one-way valve 11, pushing the piston to move to the initial position. The liquid in the upper chamber of the inlet cylinder is discharged into the main return liquid through the transducer valve 2.

[0023] After time t, the other valve core of the pilot valve 4 is opened at the same time, driving the liquid replenishment valve 5 and the liquid discharge valve 12 to operate. Continue to replenish liquid into the system until the liquid inlet piston 7 and the liquid return piston 13 move to the initial position and stop. This process is also controlled by time. The process is as follows:

[0024] Liquid replenishment process 1: main liquid inlet → transducer valve 2 → lower chamber of liquid return cylinder 13 → second filter 9 → first one-way valve 8 → lower chamber of liquid inlet cylinder 7 → transducer valve 2 → main liquid return.

[0025] Rehydration process 2: main liquid inlet → first filter 3 → liquid replenishment valve 6 → lower chamber of liquid inlet cylinder 7 → transducer valve 2 → main liquid return;

[0026] Fluid replenishment process 3: main liquid inlet → transducer valve 2 → lower chamber of return liquid cylinder 13 → drain valve 12.

[0027] It should be emphasized that the embodiments described in the present invention are illustrative rather than restrictive. Therefore, the present invention includes but is not limited to the embodiments described in the specific implementation manner. Any other implementation manners derived by those skilled in the art based on the technical solution of the present invention also fall within the scope of protection of the present invention.

Claims

1. An electro-hydraulic controlled reversing valve device for a mining hydraulic support, characterized in that: It includes a pilot valve, a transducer valve, a liquid inlet cylinder, a liquid return cylinder, a liquid replenishing valve, a liquid discharge valve, four one-way valves and two filters; the downhole main liquid inlet pipe is connected to the upper chamber of the liquid inlet cylinder through the transducer valve, the downhole main liquid inlet pipe is connected to the liquid replenishing valve through the first filter, and the downhole main liquid inlet pipe is also connected to the lower chamber of the liquid return cylinder and the main valve; one valve core of the pilot valve is connected to the transducer valve and controls it, the other valve core of the pilot valve is respectively connected to the liquid replenishing valve and the liquid discharge valve and controls them, one pipeline of the pilot valve is connected to the downhole through the fourth one-way valve The main return liquid pipe is connected, and another pipeline of the pilot valve is connected to the liquid replenishing valve. The other end of the liquid replenishing valve and the lower chamber of the liquid inlet cylinder are both connected to the liquid inlet end of the third one-way valve. The liquid outlet end of the third one-way valve is connected to the main valve through an electromagnetic pilot valve. The main valve is connected to the hydraulic support and controls it; the main valve is also connected to the liquid inlet end of the second one-way valve through the electromagnetic pilot valve, and the liquid outlet end of the second one-way valve is connected to the drain valve, the upper chamber of the liquid return cylinder and the second filter. The other end of the second filter is connected to the lower chamber of the liquid inlet cylinder through the first one-way valve.

2. The electro-hydraulic controlled reversing valve device for a mining hydraulic support according to claim 1 is characterized in that: The liquid inlet cylinder and the liquid return cylinder are respectively equipped with a liquid inlet position sensor and a liquid return position sensor, which are both connected to the bracket controller and transmit the detected liquid level to the bracket controller. The bracket controller controls the movement of the two valve cores of the pilot valve according to the liquid level.

3. The electro-hydraulic controlled reversing valve device for a mining hydraulic support according to claim 1 or 2, characterized in that: The first filter and the second filter are both 25 μm filters.

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