Electro-hydraulic main valve integrated with speed regulation function

Abstract

The present invention discloses an electro-hydraulic main valve integrated with a speed regulation function, comprising: a valve body having a main liquid inlet passage; a speed regulation valve sleeve arranged in the valve body, the inlet end of the speed regulation valve sleeve being communicated with the inlet end of the main liquid inlet passage, the middle part of the speed regulation valve sleeve being communicated with the outlet end of the main liquid inlet passage, and a screw sleeve being arranged at the tail of the speed regulation valve sleeve; a speed regulation valve core arranged in the inner cavity of the speed regulation valve sleeve, a throttle hole being arranged at the head of the speed regulation valve core, the speed regulation valve core having a first position for communicating the inlet end and the outlet end of the main liquid inlet passage, and a second position for blocking the inlet end and the outlet end of the main liquid inlet passage and simultaneously communicating the inlet end and the outlet end of the main liquid inlet passage through the throttle hole; and an electric control valve for enabling the speed regulation valve core to reach the second position from the first position. The present invention effectively improves the speed and accuracy of the support position adjustment and meets the working requirements of the hydraulic support.

Description

Technical Field

[0001] The present invention relates to the technical field of electro-hydraulic main valves for hydraulic supports, and in particular to an electro-hydraulic main valve integrated with a speed regulation function. Background Art

[0002] With the standardization of underground coal mine management, the requirements for the attitude and front-back consistency of hydraulic supports during operation are getting higher and higher. The adjustment accuracy of the existing electro-hydraulic main valves of hydraulic supports is not high. When adjusting the actions of the supports (such as pushing the scraper conveyor and pulling the support), it is not easy to accurately control the adjustment position, and there are large errors. Often, it is necessary to repeatedly adjust many times to reach the preset position, which is time-consuming and laborious, and affects the normal progress of production. Summary of the Invention

[0003] In order to solve the above problems, the present invention provides an electro-hydraulic main valve integrated with a speed regulation function, and specifically, the following technical solutions can be adopted:

[0004] The electro-hydraulic main valve integrated with a speed regulation function according to the present invention includes

[0005] a valve body having a main liquid inlet passage;

[0006] a speed regulation valve sleeve disposed in the valve body, the inlet end of the speed regulation valve sleeve is communicated with the inlet end of the main liquid inlet passage, the middle part of the speed regulation valve sleeve is communicated with the outlet end of the main liquid inlet passage, and a screw sleeve is provided at the tail of the speed regulation valve sleeve;

[0007] a speed regulation valve core disposed in the inner cavity of the speed regulation valve sleeve, a throttle hole is provided at the head of the speed regulation valve core, the speed regulation valve core has a first position for communicating the inlet end and the outlet end of the main liquid inlet passage, and a second position for blocking the inlet end and the outlet end of the main liquid inlet passage and at the same time communicating the inlet end and the outlet end of the main liquid inlet passage through the throttle hole;

[0008] an electric control valve for moving the speed regulation valve core from the first position to the second position.

[0009] The speed regulation valve sleeve, the speed regulation valve core and the screw sleeve form a control liquid storage cavity; the electric control valve is an electromagnetic pilot valve, and the control liquid at the outlet end thereof is communicated with the control liquid storage cavity through a control flow passage.

[0010] The control flow passage includes a first flow passage provided on the valve body, an annular groove provided outside the screw sleeve, and a radial through hole provided on the screw sleeve. The inlet end of the first flow passage is communicated with the control liquid outlet end of the electric control valve, the outlet end of the first flow passage is communicated with the annular groove, one end of the radial through hole is communicated with the annular groove, and the other end is communicated with the control liquid storage cavity.

[0011] The electro-hydraulic main valve integrated with a speed regulation function provided by the present invention has a simple structure, is convenient to use, reliable and stable. By installing a valve string capable of changing the flow rate on the main liquid inlet channel, which is controlled by an electromagnetic valve. When it is necessary to change the flow rate, the electromagnetic valve is activated to adjust the position of the valve string, thereby changing the flow rate of the main liquid inlet and achieving precise adjustment of the support action. The present invention effectively improves the speed and accuracy of support position adjustment and meets the working requirements of the hydraulic support. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 is a schematic structural diagram of the present invention.

[0013] Figure 2 is Figure 1 a schematic diagram of the speed regulation valve core in a throttling state in DETAILED DESCRIPTION OF THE EMBODIMENTS

[0014] The following detailed description of the embodiments of the present invention is given on the premise of the technical solution of the present invention, and the detailed implementation manners and specific working processes are provided, but the protection scope of the present invention is not limited to the following embodiments.

[0015] As Figure 1 , 2 shown, the electro-hydraulic main valve integrated with a speed regulation function according to the present invention includes a valve body 1, on which a main liquid inlet channel 2 is provided, having a horizontally arranged inlet end P and a vertically arranged outlet end; a speed regulation valve sleeve 3 is also installed in the valve body 1, which is coaxially arranged with the inlet end of the main liquid inlet channel 2 and is fixed by a screw sleeve 4; the inlet end of the above speed regulation valve sleeve 3 is communicated with the inlet end of the main liquid inlet channel 2, and a through hole communicated with the outlet end of the main liquid inlet channel 2 is provided in the middle; a speed regulation valve core 5 is installed in the inner cavity of the speed regulation valve sleeve 3, a throttling hole 6 is provided at the head of the speed regulation valve core 5, and a control liquid storage cavity 7 is formed by the tail of the speed regulation valve core 5, the speed regulation valve sleeve 3 and the screw sleeve 4. The speed regulation valve core 5 has a first position (see Figure 1 ) for communicating the inlet end and the outlet end of the main liquid inlet channel 2, and a second position (see Figure 2 ) for blocking the inlet end and the outlet end of the main liquid inlet channel 2 and simultaneously communicating the inlet end and the outlet end of the main liquid inlet channel 2 through the throttling hole 6; an electromagnetic control valve 8 is also installed on the valve body 1 for moving the speed regulation valve core 5 from the first position to the second position.

[0016] The above-mentioned electric control valve 8 adopts an electromagnetic pilot valve, and the control liquid at its outlet end is connected to the control liquid storage cavity 7 through a control flow path. The above-mentioned control flow path generally consists of a first flow path 901 provided on the valve body 1, an annular groove 902 provided outside the screw sleeve 4, and a radial through hole 903 opened on the screw sleeve 4. Among them, the inlet end of the first flow path 901 is connected to the control liquid outlet end of the electric control valve 8, the outlet end is connected to the annular groove 902, the annular groove 902 is correspondingly arranged outside the radial through hole 903, and the other end of the radial through hole 903 is connected to the control liquid storage cavity 7.

[0017] Under normal working conditions, the speed control valve core 5 is in the first position, and the working liquid maintains the maximum flow supply state. When the support needs to be accurately adjusted, the electric control valve 8 (electromagnetic pilot valve) is started, and the control liquid at its outlet end enters the control liquid storage cavity 7 through the control flow path. As the pressure increases, the speed control valve core 5 moves to the left until the speed control valve core 5 is in sealing contact with the speed control valve sleeve 3, blocking the inlet end P and the outlet end of the main liquid inlet passage 2. At this time, the working liquid must pass through the throttle hole 6 to reach the outlet end from the inlet end. Since the throttle hole 6 usually adopts a small size of 2-φ2, it can play a role in regulating the flow rate of the working liquid and realize the accurate adjustment of the support. After the adjustment is completed, the electric control valve 8 (electromagnetic pilot valve) stops supplying liquid to the control liquid storage cavity 7. As the continuous supply of the working liquid inlet volume, the speed control valve core 5 gradually moves to the right until it reaches the first position and resumes normal liquid supply.

[0018] It should be noted that in the description of the present invention, terms indicating orientation or positional relationships such as "front", "rear", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

Claims

1. An electro-hydraulic main valve integrated with a speed regulation function, characterized in that: The electro-hydraulic main valve includes a valve body having a main liquid inlet passage; a speed control valve sleeve disposed in the valve body, an inlet end of the speed control valve sleeve being in communication with an inlet end of the main liquid inlet passage, a middle portion of the speed control valve sleeve being in communication with an outlet end of the main liquid inlet passage, and a screw sleeve being provided at a tail portion of the speed control valve sleeve; a speed control valve core disposed in an inner cavity of the speed control valve sleeve, a throttling hole being provided at a head portion of the speed control valve core, the speed control valve core having a first position in which the inlet end and the outlet end of the main liquid inlet passage are in communication, and a second position in which the inlet end and the outlet end of the main liquid inlet passage are blocked and the inlet end and the outlet end of the main liquid inlet passage are in communication through the throttling hole; an electric control valve for moving the speed control valve core from the first position to the second position; the speed control valve sleeve, the speed control valve core and the screw sleeve form a control liquid storage cavity; the electric control valve is an electromagnetic pilot valve, and control liquid at an outlet end thereof is in communication with the control liquid storage cavity through a control flow passage; In a normal working state, the speed control valve core is in the first position, and the working liquid maintains a maximum flow supply state. When the support needs to be accurately adjusted, the electric control valve is started, and the control liquid at its outlet end enters the control liquid storage cavity through the control flow passage. As the pressure increases, the speed control valve core moves leftward until the speed control valve core is in sealing contact with the speed control valve sleeve, blocking the inlet end and the outlet end of the main liquid inlet passage. At this time, the working liquid must pass through the throttling hole to reach the outlet end from the inlet end. After the adjustment is completed, the electric control valve stops supplying liquid to the control liquid storage cavity. As the working liquid continues to be supplied, the speed control valve core gradually moves rightward until it reaches the first position and returns to normal liquid supply; The control flow passage includes a first flow passage provided on the valve body, an annular groove provided outside the screw sleeve, and a radial through hole provided on the screw sleeve. An inlet end of the first flow passage is in communication with a control liquid outlet end of the electric control valve, and an outlet end of the first flow passage is in communication with the annular groove.

Images