CN107345485A - Hydraulic support pilot operated safety valve - Google Patents

Abstract

The present invention adopts a cylindrical structure, as shown in Figure 2, the pilot safety valve body 1 realizes the end seal through the nut 9, the pilot spring adjustment nut 10 is connected with the main control spring adjustment nut 11 through threads, and the pilot spring 13 can be adjusted The pilot small flow control spool 14 is pressed against the end face of the large flow spool control rod 18 by the pilot spring 13 and sealed by the pilot spool seal assembly 16 . The adjusting nut 11 realizes the pressure adjustment of the main control spring 2 by cooperating with the internal thread of the valve body 1. The main control spring 2 is pressed against the end of the large flow control spool 15 after being pressurized, and at the same time, the large flow control spool 15 is pressed tightly. On the end face of the end nut 4 , the end face seal between the large flow control valve core 15 and the end nut 4 is realized through the main spring seat end face seal assembly 17 . The terminal nut 4 is connected to the valve body 1 through an internal thread, and the locknut 3 realizes the fastening and anti-loosening between the terminal nut 4 and the valve body 1 .

Description

Hydraulic support pilot safety valve

technical field

The pilot safety valve of the patented hydraulic support of the invention is suitable for the safety control of large flow and rapid pressure relief of the hydraulic support of mines.

Background technique

At present, the structure of the coal mine hydraulic support safety valve is a direct control type, and the structural section is shown in Figure 1. The direct control type safety valve uses a main spring 2 to control the opening and closing of the main spring seat 21, and there is obvious action hysteresis in the working process. During the working process, the working resistance of the hydraulic support due to the mine pressure forms a high-pressure working fluid in the P chamber. When the pressure reaches the set pressure of the main spring 2, the force passes through the control spool 19 and pushes the main spring seat 21 to communicate. In the P, F, B, G, E oil circuits, the oil leaks into the atmosphere through the channels of the hole nut 24, so as to realize the safety protection of the hydraulic support.

Directly controlled safety valve, when the hydraulic support needs to be protected, the safety valve is opened at one time. This structure requires a high stiffness of the main spring, and there is obvious movement hysteresis during the working process. When the hydraulic support is subjected to an instantaneous high pressure impact, the safety valve cannot be instantly opened to relieve the pressure, which can easily cause the hydraulic support to be damaged by pressure.

Contents of the invention

The pilot-operated safety valve mainly consists of two parts, and the structural section is shown in Figure 2. (1) Pilot small flow rapid pressure relief control part, which is mainly composed of pilot spring adjustment nut 10, pilot spring seat 12, pilot spring 13 and pilot small flow control spool 14. The pilot spring is designed with a low-rigidity spring to meet the rapid pressure release requirements of the mine's instantaneous high pressure on the hydraulic support. (2) Large-flow rapid discharge control part, which is composed of main control spring 2, main spring adjustment nut 11, large-flow control spool 15, sealing assembly 17, and large-flow spool control rod 18. The liquid channel of the large flow control component is composed of a pilot control damping hole C, a pilot control drain channel A, an oil accumulation working chamber G, and an oil leakage channel O. Among them, the working chamber C is formed by processing the symmetrical center of the large flow valve core control rod 18, the pilot control drain hole oil passage A is processed and formed at the center of the large flow control valve core 15, and the oil accumulation working chamber G is formed by the internal working chamber of the valve body 1. , The oil leakage channel O is processed and formed in the circumferential direction of the valve body 1 .

The above design forms a nested structure of inner and outer double springs and double spools, which can realize the control of instantaneous pressure relief of the hydraulic support and large flow discharge callback, forming a gradient protection for the pressure and flow of the hydraulic support.

The technical solution adopted by this patent

The valve body 1 of the barrel type pilot safety valve realizes end sealing through the nut 9, the pilot spring adjusting nut 10 is connected with the main control spring adjusting nut 11 through threads, and can adjust the pressure of the pilot spring 13, and the pilot small flow control spool 14 passes through the pilot The spring 13 is pressed against the end face of the control rod 18 of the large flow valve core, and the seal is realized by the pilot valve core sealing assembly 16 . The adjusting nut 11 realizes the pressure adjustment of the main control spring 2 by cooperating with the internal thread of the valve body 1. The main control spring 2 is pressed against the end of the large flow control spool 15 after being pressurized, and at the same time, the large flow control spool 15 is pressed tightly. On the end face of the end nut 4 , the end face seal between the large flow control valve core 15 and the end nut 4 is realized through the main spring seat end face seal assembly 17 . The terminal nut 4 is connected to the valve body 1 through an internal thread, and the locknut 3 realizes the fastening and anti-loosening between the terminal nut 4 and the valve body 1 .

The invention transforms the direct control mode of the hydraulic support safety valve currently used, and adopts the pilot control mode, which improves the rapid pressure relief capability and shortens the rapid liquid discharge time.

The method and working principle of this patent

(1) Pilot small flow rapid pressure relief control. The working resistance of the hydraulic support generated by the mine pressure forms a high-pressure working fluid in the P chamber. When the pressure reaches the adjustment pressure of the pilot spring 13, the pilot small flow control spool 14 is pushed through the pilot control damping hole C to push the control spool 14 Compress the pilot spring 13, open the pilot spool 14 instantly, and connect the P, C, A, G, O oil passages, and the high-pressure oil in the P cavity leaks into the air through the C, A, G, O oil passages to realize hydraulic pressure. The support instantaneously releases pressure quickly. The rapid pressure relief action time is realized by rationally designing the stiffness of the pilot spring 13 and adjusting the position of the adjusting nut 10. The structural design of the pilot spool 14 is also conducive to the pilot small flow rapid pressure relief control.

(2) Large flow and fast drainage control. The high-pressure oil in the P chamber acts on the end of the large flow control rod 18. When the force reaches the opening pressure of the main spring 2, the main spring 2 is compressed to open the control valve core 15 of the main spring. The high pressure in the P chamber The oil leaks into the air through C, F, B, A, G, and O to realize large-flow rapid drainage control, ensure the rapid return of the hydraulic support under the impact pressure of the mine, and ensure the safety of the hydraulic support.

Description of drawings

In order to facilitate the comparison of the structural differences between the hydraulic support safety valve involved in the present invention and the existing hydraulic support safety valve, the structures and components with the same function are numbered with the same numbers and letters in Figure 1 and Figure 2 .

Description of part codes in the figure

1-valve body; 2-main control spring; 3-lock nut; 4-end nut; 5-sealing assembly; 6-filter assembly; 7, 8-sealing assembly; 9-end sealing nut; Spring adjustment nut; 11, 22-main spring adjustment nut; 12-pilot spring seat; 13-pilot spring; 14-pilot small flow control spool; 15-large flow control spool; 21-main spring seat; 16-pilot Spool seal assembly; 17-large flow control spool end face seal assembly; 18-large flow spool control rod; 19-control spool; 20-seal; 23-end cover; 24-medium hole nut.

The letter description of the oil channel in the figure:

P-high-pressure oil working chamber; O, E-oil leakage channel; A-pilot control drain hole oil channel; B-large flow main control drain oil channel; C-pilot control damping hole; D-push rod work Cavity; F-control oil drain channel; G-oil accumulation working chamber.

Advantages of this patent

1. This patent adopts the nested structure design of double springs and double spools, which improves the response sensitivity of the hydraulic support to pressure shocks.

2. The parameter design of the pilot small spring and its pressure adjustment meet the requirements of the hydraulic support for quick response to the pressure action, and it has a good performance parameter coordination with the pilot valve core.

3. The design of the large-flow rapid discharge control spring and its components meets the requirements of the safety valve for large-flow rapid discharge, and the spring and the valve seat have good performance matching parameters.

4. The overall structure of the pilot-operated safety valve is simple, which can realize the performance design of series products and meet the performance change requirements of series hydraulic supports.

Claims (9)

1. claim 1.

2. a kind of hydraulic support pilot operated safety valve, it is characterised in that installed in guide's low discharge fast pressure relief of valve inner Control unit, and the quick drainage control unit of big flow.

3. wherein：

Guide's low discharge fast pressure relief control unit, the part is mainly by the adjusting nut for adjusting guide's spring and its stable guide Guide's spring base of spring and guide's Small Flow Control valve element composition of control fast pressure relief.

4. component realizes the oil circuit of control action by being directly connected to the high-voltage oil liquid working chamber of hydraulic support working chamber, opening up Leakage path in flow valve element control-rod and the leakage path composition being opened in flow valve element.

5. the design that guide's spring rate designs with spring adjusting nut stroke forms serial ginseng according to hydraulic support working resistance Number.

6. the quick drainage control unit of big flow, part is mounted between big flow control-rod and valve body in end nut by sliding Form the main spring control valve element composition of certain big flow main control discharge opeing oil duct.

7. fit structure part realizes the high-voltage oil liquid working chamber of control action, the control between flow control-rod and end nut Oily discharge opeing oil duct, and the oil liquid leakage passage on valve body periphery is opened in, the series for realizing hydraulic support by rational design is joined Numerical control system.

8. claim 2.

9. hydraulic support pilot operated safety valve as claimed in claim 1, it is characterised in that inside and outside dual spring, double spool are nested Structure, formed to hydraulic support pressure and the protection of the gradient of flow.