WO2018094655A1

WO2018094655A1 - Hydraulic support with staged pressure relief and method for controlling same

Info

Publication number: WO2018094655A1
Application number: PCT/CN2016/107130
Authority: WO
Inventors: 朱传奇; 谢广祥; 王磊
Original assignee: 安徽理工大学
Priority date: 2016-11-24
Filing date: 2016-11-24
Publication date: 2018-05-31

Abstract

Disclosed are a hydraulic support with staged pressure relief and a method for controlling the hydraulic support. The hydraulic support comprises a top support beam (4), a support base (7), a support shield beam (5), a tailing support beam (6), and a front-row support column (1) and a rear-row support column (1) located between the top support beam (4) and the support base (7), a front-row pressure relief device arranged on the front-row support column (1), and a rear-row pressure relief device arranged on the rear-row support column (1), so that the front-row pressure relief device and the rear-row pressure relief device release pressure independently of one another and release pressure in a staged manner according to the pressure from a top plate. If the pressure comes from the top plate, unloading is performed automatically in a staged manner by the front-row pressure relief device and/or the rear-row pressure relief device to lower the height of a front part and/or a rear part of the top support beam (4) so as to prevent the crushing of the support. The front and/or rear end of the top support beam (4) are lowered in height independently when the pressure comes from the top plate, and release the pressure in the staged manner according to the pressure from the top plate, thus playing a role of pressure reduction and buffering to prevent the tilting and crushing of the support.

Description

Graded pressure relief hydraulic support and hydraulic support control method

Technical field

The invention relates to a step-by-step pressure relief hydraulic support and a hydraulic support control method.

Background technique

The hydraulic support is the main equipment of the fully mechanized mining face. It plays a key role in supporting the roof of the stope, providing safe working space and moving the coal transportation equipment. The normal operation of the hydraulic support is the prerequisite for safe and efficient mining.

After the coal is mined, the stress of the surrounding rock in the stope is redistributed, and some of the stress originally acting on the surrounding rock around the stope is transferred to the hydraulic support. When the pressure acting on the support is large, if the pressure cannot be relieved in time, the pole It is easy to cause the bottom of the bracket to even bottom out, which causes the working surface to advance and stagnate, which seriously affects production.

At present, the pressure bracket is prevented by increasing the working resistance of the hydraulic support. This method has high performance requirements and high cost for the hydraulic support, and the pressure frame accident cannot be completely eliminated.

Chinese patent document CN102330560A discloses a mine hydraulic support column with anti-pressure device, a lower safety valve is arranged on the oil inlet pipe of the lower cavity of the cylinder body, and an unloading small hole group is arranged on the side wall of the cylinder body. The unloading small hole group is connected with the safety valve, and the safety valve is unloaded when the working resistance of the hydraulic column is exceeded. The unloading pressure of the lower safety valve is 1.3 to 1.5 times of the relief pressure of the upper safety valve.

The above-mentioned anti-pressure frame measures need to open an unloading small hole group on the side wall of the cylinder body, which has an influence on the cylinder structure.

Summary of the invention

The object of the present invention is to provide a stepped pressure relief hydraulic support capable of actively releasing pressure in time when the pressure of the top plate is large to prevent the pressure frame.

Another object of the present invention is to provide a hydraulic support control method capable of actively releasing pressure in time when the pressure of the top plate is large to prevent the pressure frame.

To this end, an aspect of the present invention provides a hydraulic support control method for controlling a pressure bracket caused by a roof pressure during a working face recovery process, the hydraulic support including a bracket top beam, a bracket base, and a bracket. a shield beam, a bracket tail beam, a front row of column pillars and a rear row of pillars between the bracket top beam and the bracket base, a front row of pressure relief devices disposed on the front row of the pillars, and the rear row of brackets a rear discharge pressure relief device disposed on the column, the front discharge pressure relief device and the rear discharge pressure relief device are independently depressurized, and the pressure is gradually discharged according to the top plate, and is discharged through the front discharge when the top plate is pressed The pressure device and/or the rear discharge pressure device are automatically staged to unload the front and/or rear height of the bracket top beam to prevent the pressure frame.

Further, the front discharge pressure relief device is divided into three stages according to the pressure of the top plate, wherein the first stage pressure relief is performed when the pressure reaches 0.80-0.85 times the working resistance, and the pressure reaches 1.0 after the first stage pressure relief. -1.05 times working resistance, the second stage pressure relief is performed, and after the second stage pressure relief valve, the pressure reaches 1.3-1.35 times working resistance and the third stage pressure is released.

Further, the front discharge pressure relief device or the rear discharge pressure relief device includes a first sequence valve, a second sequence valve and a third sequence valve sequentially connected in series on the main pressure relief oil line, and is further included in the first sequence valve a first pressure relief valve communicating with the main pressure relief oil passage, a second pressure relief valve communicating with the main pressure relief oil passage after the second sequence valve, and after the third sequence valve a third pressure relief valve in communication with the main pressure relief oil passage, wherein an opening pressure of the first sequence valve is equal to 0.80 to 0.85 times working resistance of the hydraulic column, and an opening pressure of the second sequence valve is equal to a hydraulic column 1.0-1.05 times working resistance, the opening pressure of the third sequence valve is equal to 1.3-1.35 times working resistance of the hydraulic column, and the opening pressures of the first pressure relief valve, the second pressure relief valve and the third pressure relief valve are 0.1-0.3 times working resistance of the hydraulic column.

Further, an alarm is issued when the second sequence valve is open.

Further, the front discharge pressure relief device is an integral hydraulic valve.

According to another aspect of the present invention, a stepped pressure relief hydraulic bracket is provided, including a bracket top beam, a bracket base, a bracket cover beam, a bracket tail beam, a front row of pillars and a post between the bracket top beam and the bracket base a row of racks, further comprising a front row of pressure relief devices disposed on the front row of column pillars, and a rear row of pressure relief devices disposed on the rear row of column pillars, wherein the front row of brackets The column is connected to the emulsion tank through the front row pressure relief device, and the rear row column is connected to the emulsion tank through the rear row pressure relief device, and the front row pressure relief device and the rear row pressure relief device are independently unloaded Pressing, and the front row pressure relief device and the rear row pressure relief device are both stepped pressure relief devices.

Further, the front discharge pressure relief device is a three-stage pressure relief device.

Further, the three-stage pressure relief device includes a first sequence valve, a second sequence valve, and a third sequence valve sequentially connected in series with the main pressure relief oil line, and further includes the first sequence valve and the main discharge a first pressure relief valve communicating with the pressure oil passage, a second pressure relief valve communicating with the main pressure relief oil passage after the second sequence valve, and the main pressure relief oil after the third sequence valve a third pressure relief valve connected to the road, wherein the opening pressure of the first sequence valve is equal to 0.80-0.85 working resistance of the hydraulic column, and the opening pressure of the second sequence valve is equal to 1.0-1.05 working resistance of the hydraulic column The opening pressure of the third sequence valve is equal to 1.3-1.35 times working resistance of the hydraulic column, and the opening pressures of the first pressure relief valve, the second pressure relief valve and the third pressure relief valve are 0.1-0.3 of the hydraulic column Double working resistance.

Further, the above three-stage pressure relief device is an integral hydraulic valve.

Further, the stepped pressure relief hydraulic support further includes an alarm device and a pressure relay electrically connected to the alarm device, wherein the pressure relay is in communication with the main pressure relief oil passage, and the opening pressure is equal to 1.0- of the working resistance. 1.05 times.

The grading pressure relief hydraulic support comprises a bracket column, a bracket top beam, a bracket cover beam, a bracket tail beam, a bracket base, a shift jack, a front row support column, a rear row support column, a front row support column and a rear row support column respectively The pressure relief device with stepped pressure relief, the front end and/or the rear end of the bracket top beam independently reduce the height when the top plate is pressed, and the pressure is gradually released according to the pressure of the top plate, thereby functioning as a pressure relief buffer to prevent the bracket from being Tilt and press frame.

In addition to the objects, features and advantages described above, the present invention has other objects, features and advantages. The invention will now be described in further detail with reference to the drawings.

DRAWINGS

The accompanying drawings, which are incorporated in the claims of the claims In the drawing:

Figure 1 is a schematic view showing the structure of a step-down hydraulic support according to the present invention;

Figure 2 is a schematic view showing the use state of the step-down hydraulic support according to the present invention at the mining face;

3 is a schematic view showing the principle of a three-stage pressure relief device for a stepped pressure relief hydraulic support according to the present invention.

Description of the reference numerals

1. Support column; 2. Pressure relief valve;

3. Early warning device; 4. Supporting top beam;

5. Support cover beam; 6. Support tail beam;

7, the base of the bracket; 8, the jack;

9, scraper conveyor; 10, coal mining machine;

11. Shearer drum; 12, coal seam roof;

13. Coal seam floor; 14. Coal wall;

15. Goaf area; 20. Front row pressure relief device;

21, a first sequence valve; 22, a second sequence valve;

23, a third sequence valve; 24, a first pressure relief valve;

25. Second pressure relief valve; 26. Third pressure relief valve.

detailed description

It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other without conflict. The invention will be described in detail below with reference to the drawings in conjunction with the embodiments.

Figures 1 and 3 illustrate some embodiments in accordance with the present invention.

The hydraulic bracket control method of the invention is used for controlling a pressure bracket caused by a roof pressure during a working face mining process, the hydraulic bracket comprises a bracket top beam, a bracket base, a bracket cover beam, a bracket tail beam, and a bracket a front row of pillars and a rear row of pillars between the top beam and the base of the bracket, a front row of pressure relief devices disposed on the pillars of the front row of brackets, and a rear row of pressure relief devices disposed on the pillars of the rear row of brackets The front discharge pressure relief device and the rear discharge pressure relief device are independently depressurized, and the pressure is gradually reduced according to the top plate. When the top plate is pressed, the front discharge pressure relief device and/or the rear discharge pressure are released. The device automatically grades the unloading to reduce the height of the front and/or rear of the top beam of the bracket to prevent the pressure bracket.

In one embodiment, the front row pressure relief device is stepped down according to the pressure of the top plate to a three-stage pressure relief, wherein the first stage pressure relief is performed when the pressure reaches 0.80-0.85 times the working resistance, after the first stage pressure relief When the pressure reaches 1.0-1.05 times working resistance, the second-stage pressure relief is performed, and after the second-stage pressure relief valve, the pressure reaches 1.3-1.35 times working resistance to perform three-stage pressure relief.

In this embodiment, the stepwise pressure relief is controlled according to the relationship between the pressure of the top plate and the working resistance of the support column, and the first stage pressure relief occurs when the working resistance of the column is not reached (ie, 0.8-0.85 working resistance, When the time exceeds the normal support pressure range of the column, generally limited to 0.7 times the working resistance, it acts as a buffer to reduce pressure.

In one embodiment, as shown in FIG. 3, the front discharge pressure relief device or the rear discharge pressure relief device includes a first sequence valve, a second sequence valve, and a third sequence valve that are sequentially connected in series on the main pressure relief oil passage. a first pressure relief valve in communication with the main pressure relief oil passage after the first sequence valve, a second pressure relief valve in communication with the main pressure relief oil passage after the second sequence valve, a third pressure relief valve in communication with the main pressure relief oil passage after the third sequence valve, wherein an opening pressure of the first sequence valve is equal to 0.80 to 0.85 times working resistance of the hydraulic column, the second The opening pressure of the sequence valve is equal to 1.0-1.05 times working resistance of the hydraulic column, the opening pressure of the third sequence valve is equal to 1.3-1.35 times working resistance of the hydraulic column, the first pressure relief valve, the second pressure relief valve and The opening pressure of the third pressure relief valve is 0.1 to 0.3 times the working resistance of the hydraulic column.

In the embodiment, the three-stage unloading device automatically decompresses the pressure, the pressure of each pressure relief valve is small, the pressure relief action is reliable, and the higher the pressure of the top plate, the more the pressure relief valve is opened, the greater the unloading amount, the unloading reaction Fast, to a certain extent (for example, when not more than 3 times the working resistance) to avoid the pressure frame, pressure explosion problem. Compared with the prior art, there is no need to additionally open an unloading hole in the wall of the cylinder, and the unloading is more reliable than the secondary unloading. In a hydraulic support, the opening pressure of the first sequence valve is 35 MPa, the opening pressure of the second sequence valve is 40 MPa, and the third sequence valve is 45 MPa.

In one embodiment, the three-stage pressure relief device is an integral hydraulic valve that includes only one inlet P and one oil return port T, which simplifies the installation of the pipeline connection.

In the modified embodiment of the embodiment shown in Fig. 3, the two-stage unloading is employed, and the second sequence valve and the second pressure relief valve are omitted, and the unloading pressure is constant.

In one embodiment, the front row of the column is a pressure relief device with a three-stage pressure relief, and the rear column has a pressure relief device with a two-stage pressure relief.

As shown in FIG. 1 and FIG. 2, the stepped pressure relief hydraulic bracket of the present invention comprises a bracket top beam, a bracket base, a bracket cover beam, a bracket tail beam, a front row support column and a rear pillar between the bracket top beam and the bracket base. a row of racks, further comprising a front row of pressure relief devices disposed on the front row of column pillars, and a rear row of pressure relief devices disposed on the rear row of column pillars, wherein the front row of brackets The column is connected to the emulsion tank through the front row pressure relief device, and the rear row column is connected to the emulsion tank through the rear row pressure relief device, and the front row pressure relief device and the rear row pressure relief device are independently unloaded Pressing, and the front row pressure relief device and the rear row pressure relief device are both stepped pressure relief devices.

In an embodiment, the stepped pressure relief hydraulic support further includes an alarm device and a pressure relay electrically connected to the alarm device, wherein the pressure relay is in communication with the main pressure relief oil passage, and the opening pressure is equal to the working resistance 1.0-1.05 times. In the present embodiment, the opening and closing of the alarm device is controlled by the oil passage pressure, for example, an acoustic/light alarm.

The control method of the hydraulic bracket of the present invention will be specifically described below with reference to FIG. 2:

After the coal cutter drum 11 finishes cutting coal, the support column 1 is recovered, and the scraper conveyor 9 and the shift jack 8 are used to pull the bracket forward integrally, and the newly exposed roof is timely supported; then the bracket column 1 is raised, and the support roof beam is supported. 4, and use the shift jack 8 to push the scraper conveyor 9 and the shearer 10 forward to complete a coal support process. When the pressure of the top plate is large, the first sequence valve and the first pressure relief valve with a threshold of 35 MPa will be actively opened after the pressure exceeds 35 MPa, the emulsion pressure is lowered, the pressure is relieved in time, the column is retracted, the bracket is lowered, and the bracket pressure is controlled. Die, and issue an early warning to remind the operator to take countermeasures. After the pressure relief valve is opened, the volume of the emulsion cavity is small, the pressure drop of the emulsion is limited, the bracket still has a large supporting force, and the working surface can be normally recovered. When the top plate is pressed more, the second pressure relief valve corresponding to the second sequence valve with a threshold of 40 MPa or the third pressure relief valve corresponding to the third sequence valve with a threshold of 45 MPa is opened, and the pillar is further relieved of pressure, and the protection is timely. Hydraulic support.

The above description is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

Claims

A hydraulic support control method for controlling a pressure bracket caused by a roof pressure during a working face mining process, the hydraulic support comprises a bracket top beam, a bracket base, a bracket cover beam, a bracket tail beam, and a bracket a front row of pillars and a rear row of pillars between the top beam and the base of the bracket, a front row of pressure relief devices disposed on the pillars of the front row of brackets, and a rear row of pressure relief devices disposed on the pillars of the rear row of brackets The utility model is characterized in that the front discharge pressure relief device and the rear discharge pressure relief device are pressure-reduced independently of each other, and the pressure is gradually decompressed according to the top plate, and the front discharge pressure relief device and/or The rear row pressure relief device automatically grades the unloading to reduce the front and/or rear height of the bracket top beam to prevent the pressure bracket.
The hydraulic support control method according to claim 1, wherein the front discharge pressure relief device is three-stage pressure relief according to the pressure of the top plate pressure, wherein the first stage pressure relief is performed when the pressure reaches 0.80 to 0.85 times the working resistance. The pressure is relieved, and the secondary pressure relief is performed when the pressure reaches 1.0 to 1.05 times the working resistance after the first stage pressure is released, and the pressure is 1.3 to 1.35 times the working resistance after the second stage pressure relief valve to perform the third stage pressure relief.
The hydraulic support control method according to claim 2, wherein the front discharge pressure relief device or the rear discharge pressure relief device comprises a first sequence valve, a second sequence valve and a serially connected series on the main pressure relief oil passage. The third sequence valve further includes a first pressure relief valve that communicates with the main pressure relief oil passage after the first sequence valve, and a first pressure relief valve that communicates with the main pressure relief oil passage after the second sequence valve a pressure relief valve, a third pressure relief valve communicating with the main pressure relief oil passage after the third sequence valve, wherein the opening pressure of the first sequence valve is equal to 0.80 to 0.85 times the working resistance of the hydraulic column The opening pressure of the second sequence valve is equal to 1.0 to 1.05 times working resistance of the hydraulic column, and the opening pressure of the third sequence valve is equal to 1.3 to 1.35 times working resistance of the hydraulic column, the first pressure relief valve, The opening pressure of the second pressure relief valve and the third pressure relief valve is 0.1 to 0.3 times the working resistance of the hydraulic column.
The hydraulic stand control method according to claim 3, wherein an alarm is issued when the second sequence valve is opened.
The hydraulic support control method according to claim 1, wherein the front discharge pressure relief device is an integral hydraulic valve.
A stepped pressure relief hydraulic support comprises a support top beam, a support base, a support cover beam, a support tail beam, a front support column and a rear support column between the support top beam and the support base, and is characterized in that a front row pressure relief device disposed on the front row of column pillars, and a rear row pressure relief device disposed on the rear row of column pillars, wherein the front row of column pillars passes through the front row of pressure relief devices and the emulsion The tank is connected to communicate with the emulsion tank through a rear discharge pressure relief device, the front discharge pressure relief device and the rear discharge pressure relief device are independently depressurized, and the front discharge pressure relief device And the rear row pressure relief device is a stepped pressure relief device.
The stepped pressure relief hydraulic power bracket according to claim 6, wherein said front discharge pressure relief device is a three-stage pressure relief device.
The stepped pressure relief hydraulic support according to claim 7, wherein said three-stage pressure relief device comprises a first sequence valve, a second sequence valve, and a third sequence valve sequentially connected in series with the main pressure relief oil passage. a first pressure relief valve in communication with the main pressure relief oil passage after the first sequence valve, a second pressure relief valve in communication with the main pressure relief oil passage after the second sequence valve, a third pressure relief valve communicating with the main pressure relief oil passage after the third sequence valve, wherein an opening pressure of the first sequence valve is equal to 0.80 to 0.85 times working resistance of the hydraulic column, and the second The opening pressure of the sequence valve is equal to 1.0 to 1.05 times working resistance of the hydraulic column, and the opening pressure of the third sequence valve is equal to 1.3 to 1.35 times working resistance of the hydraulic column, the first pressure relief valve and the second pressure relief valve and The opening pressure of the third pressure relief valve is 0.1 to 0.3 times the working resistance of the hydraulic column.
The stepped pressure relief hydraulic power bracket according to claim 8, wherein said three-stage pressure relief device is an integral hydraulic valve.
A stepped pressure relief hydraulic support according to claim 8 further comprising an alarm device and a pressure relay electrically coupled to said alarm device, wherein said pressure relay is in communication with said main pressure relief oil passage, The opening pressure is equal to 1.0 to 1.05 times the working resistance.