WO2018094656A1 - Hydraulic support capable of separately performing pressure relief by means of front pillar and rear pillar, and hydraulic support control method - Google Patents
Hydraulic support capable of separately performing pressure relief by means of front pillar and rear pillar, and hydraulic support control method Download PDFInfo
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- WO2018094656A1 WO2018094656A1 PCT/CN2016/107131 CN2016107131W WO2018094656A1 WO 2018094656 A1 WO2018094656 A1 WO 2018094656A1 CN 2016107131 W CN2016107131 W CN 2016107131W WO 2018094656 A1 WO2018094656 A1 WO 2018094656A1
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- pressure relief
- support
- relief valve
- row
- bracket
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- 238000000034 method Methods 0.000 title claims abstract description 21
- 239000000839 emulsion Substances 0.000 claims description 15
- 230000001960 triggered effect Effects 0.000 claims description 4
- 238000011084 recovery Methods 0.000 claims description 3
- 230000008569 process Effects 0.000 abstract description 5
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 239000003245 coal Substances 0.000 description 7
- 238000005065 mining Methods 0.000 description 7
- 230000009471 action Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 238000013024 troubleshooting Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D23/00—Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor
- E21D23/16—Hydraulic or pneumatic features, e.g. circuits, arrangement or adaptation of valves, setting or retracting devices
Definitions
- the invention relates to a coal mine fully mechanized mining equipment, in particular to a hydraulic support for coal mining and a hydraulic support control method.
- the hydraulic support is one of the key equipments for the fully mechanized mining face of coal mines, and the number is large.
- the normal operation of the hydraulic support is crucial for the safe and efficient production of the entire working face.
- the site is often used to strengthen the working face end support or control the propulsion speed to prevent the tilt of the bracket.
- Such measures are costly, take a lot of time, and the effect is poor.
- an aspect of the present invention provides a hydraulic support control method for controlling a tilt of a hydraulic support caused by a roof pressure during a working face recovery process
- the hydraulic support includes a bracket top beam, a bracket base, and a bracket cover beam.
- a bracket tail beam, a front bracket pillar and a rear bracket pillar located between the bracket top beam and the bracket base, a front discharge pressure relief valve disposed on the front bracket pillar, and a rear row disposed on the rear bracket pillar
- the pressure relief valve is arranged, and the front discharge pressure relief valve and the rear discharge pressure relief valve are independently depressurized.
- the front discharge pressure relief valve or the rear discharge pressure relief valve is automatically unloaded to locally reduce the pressure.
- the front or rear height of the bracket top beam to prevent tilting.
- the pressure relief threshold of the rear discharge pressure relief valve is greater than the pressure relief threshold of the front discharge pressure relief valve.
- the selection range of the pressure relief threshold is between 35 MPa and 45 MPa.
- the pressure relief threshold of the front discharge pressure relief valve is 40 MPa
- the pressure relief threshold of the rear discharge pressure relief valve is 35 MPa
- front row of the support column and the rear row of the support column are both two, evenly distributed between the top beam of the support and the base of the support.
- a front and rear column split pressure relief hydraulic support including a bracket top beam, a bracket base, a bracket cover beam, a bracket tail beam, a front row bracket between the bracket top beam and the bracket base.
- the column and the rear support column further include a front discharge pressure relief valve disposed on the front support column and a rear discharge pressure relief valve disposed on the rear support column, wherein the front support column passes through the front discharge relief valve It is connected with the emulsion tank, and the rear support column is connected to the emulsion tank through the rear discharge pressure relief valve, and the front discharge pressure relief valve and the rear discharge pressure relief valve are independently relieved.
- front discharge pressure relief valve and the rear discharge pressure relief valve are pressure relief valves with adjustable pressure relief thresholds.
- each pressure relief valve includes a first hydraulic control end and a second hydraulic control end.
- the first liquid control end and the second liquid control end are respectively connected to the emulsion chamber of one of the columns.
- the two support columns of the front support column are respectively provided with a pressure relief valve and form a pressure relief linkage relationship
- the two support columns of the rear support column are respectively provided with pressure relief valves and form a pressure relief linkage relationship.
- the pressure relief valve of the front bracket column comprises a body, an electric control end, and a normally open switch that is triggered and closed when the body is decompressed, wherein one of the two pressure relief valves of the front bracket column is relieved
- the normally open switch of the valve is electrically connected in series with the electronic control end of the other pressure relief valve to form a linkage control loop with the power source.
- the beneficial effects of the present invention are as follows: the front and rear column split type hydraulic support of the present invention is provided with a pressure relief valve on the hydraulic support post, and the main force is supported when the pressure of the top plate is uneven.
- the upper pressure relief valve can be opened in time, actively relieve pressure, partially reduce the top beam of the bracket, ensure the balance of the bracket, and the base of the bracket does not tilt off the ground to prevent the bracket from tilting.
- FIG. 1 is a schematic structural view of a front and rear column split pressure relief hydraulic support according to an embodiment of the invention
- FIG. 2 is a schematic view showing the use state of the front and rear column split pressure relief hydraulic support in the working face according to an embodiment of the present invention
- FIG. 3 is a schematic view showing a principle of a pressure relief mode of a front and rear column split pressure relief hydraulic support according to an embodiment of the invention
- FIG. 4 is a schematic view showing another principle of pressure relief of a front and rear column split pressure relief hydraulic support according to an embodiment of the present invention
- FIG. 5 is a schematic diagram showing the action between the front hydraulic valves of the front and rear column split pressure relief hydraulic supports according to an embodiment of the present invention.
- Emulsion tank 15. Emulsion tank.
- the hydraulic support tilting occurs due to the uneven pressure of the top plate, and the troubleshooting is troublesome and laborious.
- the support top beam moves up and down relative to the support base, and the support top beam is supported.
- Parallel to the base of the bracket during the process.
- the inventors have found that one end of the base of the bracket will tilt off the ground when the hydraulic support is tilted, thereby causing subsequent work failures, and the support top beam generally does not cause subsequent work failures regardless of whether it is parallel to the ground.
- the deformation capability or equipment potential implied by the hydraulic support structure itself can be used for the anti-tilt control of the hydraulic support itself after full exploration.
- the hydraulic support control method of the present invention is used for controlling the tilt caused by the pressure of the top plate during the mining process of the hydraulic support.
- the hydraulic support used in the support control method includes the support top beam. 3.
- the discharge pressure relief valve 2 and the rear discharge pressure relief valve 2' disposed on the rear support column 1' in the method, the front discharge pressure relief valve 2 and the rear discharge valve
- the pressure valve 2' is independently depressurized, and when the top plate pressure is uneven, the front or rear height of the bracket top beam 3 can be reduced by the automatic unloading of the front discharge pressure relief valve 2 or the rear discharge pressure relief valve 2'. , thereby preventing the base of the bracket from tilting off the ground.
- the support column is responsive to the uneven pressure of the top plate, and the height of the support column is reduced by the passive pressure relief of the support column, that is, when the pressure of the top plate is uneven, the pressure on the large pillar is relieved.
- the valve can be opened in time, actively relieve pressure, partially reduce the top beam of the bracket, ensure the balance of the bracket, so that the bracket base does not leave the ground at all times, so as to prevent the bracket from tilting and causing subsequent work failure, as shown in Fig. 1, the bracket top beam is The front row of the column is in a downwardly inclined state after being depressurized.
- the front end or the rear end of the bracket top beam of the hydraulic bracket is allowed to be preset in a descending distance or position. If the setting is exceeded, the pressure relief is stopped and an alarm is issued to indicate a fault to satisfy the hydraulic pressure.
- the bracket safety support meet other requirements or meet other operating equipment. Among them, the front end or the rear end of the large hydraulic support is generally allowed to be reduced by 2 m, and the front end or the rear end of the small hydraulic support is generally allowed to be lowered by 1 m.
- the pressure relief threshold of the rear discharge pressure relief valve is greater than the pressure relief threshold of the front discharge pressure relief valve.
- the pressure relief threshold of the front discharge pressure relief valve is 40 MPa
- the pressure relief threshold of the rear discharge pressure relief valve is 35 MPa.
- the pressure relief threshold is selected between 35MPa and 45MPa.
- the pressure relief threshold can be set according to the requirements of the actual working face.
- the invention is applicable not only to the case where the front support column and the rear support column have only one pillar, but also to the case where the front and rear row support columns are two, and the pressure relief valve of the front support column is interlocked.
- the pressure relief valve of the rear support column acts in linkage.
- the present invention provides a front and rear column split pressure relief hydraulic support, comprising a bracket top beam 3, a bracket base 6, a bracket cover beam 4, a bracket tail beam 5, a bracket top beam and a bracket.
- the front row of the column 1 and the synchronously arranged rear column 1' of the synchronous movement between the bases further include a front row of pressure relief valves 2 disposed on the front row of column 1 and a rear column 1'
- the rear discharge pressure relief valve 2' is disposed, wherein the front support column 1 communicates with the emulsion tank 15 through the front discharge pressure relief valve 2, and the rear support column 1' passes through the rear discharge pressure relief valve 2' and the emulsion tank 15 Connected.
- the beneficial effects of the present invention are as follows: the front and rear column split type hydraulic support of the present invention is provided with a pressure relief valve on the hydraulic support pillar, and when the pressure of the top plate is uneven, the force is applied to the pillar.
- the pressure relief valve can be opened in time, actively relieve pressure, partially reduce the top beam of the bracket, ensure the balance of the bracket, and achieve the purpose of preventing the bracket from tilting.
- the front support column and the rear support column are two hydraulic supports of the vertical column, and the two support columns of the front support column share the same pressure relief valve 2, and the rear support
- the two support columns of the column share the same pressure relief valve 2', and the front discharge pressure relief valve and the rear discharge pressure relief valve respectively include a first hydraulic control end 21 and a second hydraulic control end 22, a first hydraulic control end 21 and a second
- the hydraulic terminals 22 are respectively in communication with the emulsion chamber of a column.
- the two support columns of the front row share the same pressure relief valve, and the emulsion pressures of the two support columns are respectively introduced into the unloading valve, and respectively act on the valve core of the unloading valve, respectively.
- the unloading threshold of the unloading pressure is linearly superimposed by the pressure of the emulsion of the two scaffold columns, for example A*40 MPa+B*45 MPa, wherein A and B are weighting factors of ⁇ 1.
- the two emulsions provided by the two support columns are discharged to the emulsion tank after unloading, wherein the two emulsions do not converge before unloading.
- the front support column and the rear support column are two hydraulic supports of the vertical column. As shown in FIG. 4 and FIG. 5, the two support columns of the front support column are respectively provided with a pressure relief valve 2a. And the pressure relief valve 2b, and the pressure relief valve 2a and the pressure relief valve 2b are pressure-removing actions, each of the pressure relief valves 2a, 2b includes a body, an electronic control terminal 23, and a normally open switch that is triggered when the body is relieved of pressure. 25.
- the normally open switch 25 of one pressure relief valve 2a is connected in series with the electronic control terminal 23' of the other pressure relief valve 2b, the electronically controlled end 23 of one pressure relief valve 2a and the normally open switch 25' of the other pressure relief valve 2b. Connected in series and connected to the power supply to form a control loop.
- the pressure relief valve is an electronically controlled pressure relief valve, and the movement of the body valve core is selectively driven by the electronic control end (electromagnetic coil) or the pilot pressure.
- the electronic control end electromagnettic coil
- the pilot pressure does not reach the pressure relief threshold, Whether the electric control terminal is energized to control the pressure relief action, the electronic control end is controlled by a normally open switch on another pressure relief valve, and the switch state of the normally open switch is triggered by the pressure relief of the body of the pressure relief valve. Thereby forming a pressure relief linkage.
- the front discharge pressure relief valve and the rear discharge pressure relief valve are pressure relief valves with adjustable pressure relief thresholds.
- the adjustable range of the pressure relief threshold is between 35MPa and 45MPa.
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- Life Sciences & Earth Sciences (AREA)
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Abstract
A hydraulic support capable of separately performing pressure relief by means of a front pillar and a rear pillar and a hydraulic support control method, for use in correcting inclination of the hydraulic support caused by the pressure of a top plate (12) in a stoping process on a working face. The hydraulic support comprises a support top beam (3), a support base (6), a support caving shield (4), a support tail beam (5), a front-row support vertical pillar (1) and a rear-row support vertical pillar (1') that are located between the support top beam (3) and the support base (6), a front-row pressure relief valve (2) disposed on the front-row support vertical pillar (1), and a rear-row pressure relief valve (2') disposed on the rear-row support vertical pillar (1'). The front-row pressure relief valve (2) and the rear-row pressure relief valve (2') separately carry out pressure relief. When a pressure from the top plate (12) is not uniform, automatic unloading is carried out by means of the front-row pressure relief valve (2) or the rear-row pressure relief valve (2'), so that the height of the front portion or the rear portion of the support top beam (3) is reduced to prevent inclination. When the pressure of the top plate (12) is not uniform, the pressure relief valve on the pillar bearing a large stress can be opened in time to actively carry out pressure relief, the height of the support top beam (3) is locally decreased, and the balance of the support is ensured, thereby achieving the objective for preventing inclination of the support.
Description
本发明涉及煤矿综采设备，尤其涉及一种采煤用液压支架和液压支架控制方法。The invention relates to a coal mine fully mechanized mining equipment, in particular to a hydraulic support for coal mining and a hydraulic support control method.
液压支架是煤矿综采工作面的关键设备之一，且数量众多，液压支架能否正常工作对整个工作面的安全高效生产至关重要。The hydraulic support is one of the key equipments for the fully mechanized mining face of coal mines, and the number is large. The normal operation of the hydraulic support is crucial for the safe and efficient production of the entire working face.
在工作面回采过程中，顶板压力的不均匀分布，极易引发支架倾斜事故，势必影响煤矿正常生产。During the mining process of the working face, the uneven distribution of the roof pressure is likely to cause the bracket tilting accident, which will inevitably affect the normal production of the coal mine.
目前现场多采用加强工作面端头支护或控制推进速度来预防支架倾斜，此类措施成本较高，占用大量时间，且效果较差。At present, the site is often used to strengthen the working face end support or control the propulsion speed to prevent the tilt of the bracket. Such measures are costly, take a lot of time, and the effect is poor.
发明内容Summary of the invention
本发明的目的在于提供一种液压支架控制方法，以解决顶板压力不均造成的液压支架倾斜问题。It is an object of the present invention to provide a hydraulic support control method for solving the problem of hydraulic support tilt caused by uneven top plate pressure.
本发明的目的在于提供一种前后分体式卸压阀液压支架，以解决顶板压力不均造成的倾斜问题。It is an object of the present invention to provide a front and rear split type pressure relief valve hydraulic support to solve the tilt problem caused by uneven top plate pressure.
为此，本发明的一方面提供了一种液压支架控制方法，用于对液压支架在工作面回采过程中因顶板压力造成的倾斜进行控制，液压支架包括支架顶梁、支架底座、支架掩护梁、支架尾梁、位于支架顶梁和支架底座之间的前排支架立柱和后排支架立柱、在前排支架立柱上设置的前排卸压阀、以及在后排支架立柱上设置的后排卸压阀，并且使前排卸压阀和后排卸压阀相互独立地卸压，当顶板来压不均时通过前排卸压阀或后排卸压阀的自动卸荷，来局部降低支架顶梁的前部或后部高度，以防止倾斜。To this end, an aspect of the present invention provides a hydraulic support control method for controlling a tilt of a hydraulic support caused by a roof pressure during a working face recovery process, and the hydraulic support includes a bracket top beam, a bracket base, and a bracket cover beam. a bracket tail beam, a front bracket pillar and a rear bracket pillar located between the bracket top beam and the bracket base, a front discharge pressure relief valve disposed on the front bracket pillar, and a rear row disposed on the rear bracket pillar The pressure relief valve is arranged, and the front discharge pressure relief valve and the rear discharge pressure relief valve are independently depressurized. When the top plate is unevenly pressed, the front discharge pressure relief valve or the rear discharge pressure relief valve is automatically unloaded to locally reduce the pressure. The front or rear height of the bracket top beam to prevent tilting.
进一步地，上述后排卸压阀的卸压阈值大于前排卸压阀的卸压阈值。Further, the pressure relief threshold of the rear discharge pressure relief valve is greater than the pressure relief threshold of the front discharge pressure relief valve.
进一步地，上述卸压阈值的选择范围为35MPa-45MPa之间。Further, the selection range of the pressure relief threshold is between 35 MPa and 45 MPa.
进一步地，上述前排卸压阀的卸压阈值为40MPa，后排卸压阀的卸压阈值为35MPa。Further, the pressure relief threshold of the front discharge pressure relief valve is 40 MPa, and the pressure relief threshold of the rear discharge pressure relief valve is 35 MPa.
进一步地，上述前排支架立柱和后排支架立柱均为两根，均匀分布在支架顶梁和支架底座之间。
Further, the front row of the support column and the rear row of the support column are both two, evenly distributed between the top beam of the support and the base of the support.
根据本发明的另一方面，提供了一种前后柱分体卸压液压支架，包括支架顶梁、支架底座、支架掩护梁、支架尾梁、位于支架顶梁和支架底座之间的前排支架立柱和后排支架立柱，还包括在前排支架立柱上设置的前排卸压阀、以及在后排支架立柱上设置的后排卸压阀，其中，前排支架立柱通过前排卸压阀与乳化液箱连通，后排支架立柱通过后排卸压阀与乳化液箱连通，前排卸压阀和后排卸压阀相互独立地卸压。According to another aspect of the present invention, a front and rear column split pressure relief hydraulic support is provided, including a bracket top beam, a bracket base, a bracket cover beam, a bracket tail beam, a front row bracket between the bracket top beam and the bracket base. The column and the rear support column further include a front discharge pressure relief valve disposed on the front support column and a rear discharge pressure relief valve disposed on the rear support column, wherein the front support column passes through the front discharge relief valve It is connected with the emulsion tank, and the rear support column is connected to the emulsion tank through the rear discharge pressure relief valve, and the front discharge pressure relief valve and the rear discharge pressure relief valve are independently relieved.
进一步地，上述前排卸压阀和后排卸压阀均为卸压阈值可调的卸压阀。Further, the front discharge pressure relief valve and the rear discharge pressure relief valve are pressure relief valves with adjustable pressure relief thresholds.
进一步地，上述前排支架立柱的两个支架立柱共用同一卸压阀，后排支架立柱的两个支架立柱共用同一卸压阀，各卸压阀包括第一液控端和第二液控端，第一液控端和第二液控端分别与一个立柱的乳化液腔连通。Further, the two support columns of the front row of the support columns share the same pressure relief valve, and the two support columns of the rear support column share the same pressure relief valve, and each pressure relief valve includes a first hydraulic control end and a second hydraulic control end. The first liquid control end and the second liquid control end are respectively connected to the emulsion chamber of one of the columns.
进一步地，上述前排支架立柱的两根支架立柱分别设有卸压阀并且形成卸压联动关系，后排支架立柱的两根支架立柱分别设有卸压阀并且形成卸压联动关系。Further, the two support columns of the front support column are respectively provided with a pressure relief valve and form a pressure relief linkage relationship, and the two support columns of the rear support column are respectively provided with pressure relief valves and form a pressure relief linkage relationship.
进一步地，上述前排支架立柱的卸压阀包括本体、电控端、以及在本体卸压动作时触发而闭合的常开开关，其中，前排支架立柱的两个卸压阀中一个卸压阀的常开开关与另一个卸压阀的电控端串联电连接，以与电源构成联动控制回路。Further, the pressure relief valve of the front bracket column comprises a body, an electric control end, and a normally open switch that is triggered and closed when the body is decompressed, wherein one of the two pressure relief valves of the front bracket column is relieved The normally open switch of the valve is electrically connected in series with the electronic control end of the other pressure relief valve to form a linkage control loop with the power source.
与现有防止液压支架倾斜措施相比，本发明有益效果体现在：本发明前后柱分体式液压支架，在液压支架支柱上设置有卸压阀，在顶板压力不均匀时，受力较大支柱上的卸压阀能够及时开启，主动卸压，局部降低支架顶梁，保证支架的平衡，支架底座不翘离地面，达到防止支架倾斜的目的。Compared with the existing measures for preventing the tilting of the hydraulic support, the beneficial effects of the present invention are as follows: the front and rear column split type hydraulic support of the present invention is provided with a pressure relief valve on the hydraulic support post, and the main force is supported when the pressure of the top plate is uneven. The upper pressure relief valve can be opened in time, actively relieve pressure, partially reduce the top beam of the bracket, ensure the balance of the bracket, and the base of the bracket does not tilt off the ground to prevent the bracket from tilting.
除了上面所描述的目的、特征和优点之外，本发明还有其它的目的、特征和优点。下面将参照图，对本发明作进一步详细的说明。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.
构成本申请的一部分的说明书附图用来提供对本发明的进一步理解，本发明的示意性实施例及其说明用于解释本发明，并不构成对本发明的不当限定。在附图中：The accompanying drawings, which are incorporated in the claims of the claims In the drawing:
图1是根据本发明一实施例的前后柱分体卸压液压支架的结构示意图；1 is a schematic structural view of a front and rear column split pressure relief hydraulic support according to an embodiment of the invention;
图2是根据本发明一实施例的前后柱分体卸压液压支架在回采工作面使用状态的示意图；2 is a schematic view showing the use state of the front and rear column split pressure relief hydraulic support in the working face according to an embodiment of the present invention;
图3是根据本发明一实施例的前后柱分体卸压液压支架的一种卸压方式的原理示意图；
3 is a schematic view showing a principle of a pressure relief mode of a front and rear column split pressure relief hydraulic support according to an embodiment of the invention;
图4是根据本发明一实施例的前后柱分体卸压液压支架的另一种卸压方式的原理示意图；以及4 is a schematic view showing another principle of pressure relief of a front and rear column split pressure relief hydraulic support according to an embodiment of the present invention;
图5是根据本发明一实施例的前后柱分体卸压液压支架的前排液压阀之间的动作关联示意图。FIG. 5 is a schematic diagram showing the action between the front hydraulic valves of the front and rear column split pressure relief hydraulic supports according to an embodiment of the present invention.
附图标记说明Description of the reference numerals
1、前排支架立柱； 1’、后排支架立柱；1. Front row of columns; 1', rear row of columns;
2、前排卸压阀； 2’、后排卸压阀；2. Front discharge pressure relief valve; 2', rear discharge pressure relief valve;
3、支架顶梁； 4、支架掩护梁；3. Supporting top beam; 4. Supporting cover beam;
5、支架尾梁； 6、支架底座；5, the bracket tail beam; 6, the bracket base;
7、推移千斤顶； 8、刮板输送机；7. Change the jack; 8. Scraper conveyor;
9、采煤机； 10、采煤机滚筒；9. Shearer; 10, shearer drum;
11、煤壁； 12、煤层顶板；11, coal wall; 12, coal seam roof;
13、煤层底板； 14、采空区；13. Coal seam floor; 14. Gob area;
15、乳化液箱。15. Emulsion tank.
需要说明的是，在不冲突的情况下，本申请中的实施例及实施例中的特征可以相互组合。下面将参考附图并结合实施例来详细说明本发明。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.
在工作面回采现场，因顶板压力不均而造成的液压支架倾斜时有发生，故障排除费事费力，现有液压支架中，支架顶梁相对于支架底座整体上下平移运动，支架顶梁在支护过程中平行于支架底座。在实施本发明的过程中，本发明人发现：液压支架倾斜时支架底座的一端会翘离地面，进而引起后续工作故障，而支架顶梁不管是否平行于地面，一般不会引起后续工作故障，同时液压支架结构本身隐含的变形能力或者说设备潜力在充分发掘后能够用于液压支架本身的防倾斜控制。At the working face recovery site, the hydraulic support tilting occurs due to the uneven pressure of the top plate, and the troubleshooting is troublesome and laborious. In the existing hydraulic support, the support top beam moves up and down relative to the support base, and the support top beam is supported. Parallel to the base of the bracket during the process. In the process of implementing the present invention, the inventors have found that one end of the base of the bracket will tilt off the ground when the hydraulic support is tilted, thereby causing subsequent work failures, and the support top beam generally does not cause subsequent work failures regardless of whether it is parallel to the ground. At the same time, the deformation capability or equipment potential implied by the hydraulic support structure itself can be used for the anti-tilt control of the hydraulic support itself after full exploration.
如图1和图2所示，本发明的液压支架控制方法用于对液压支架在工作面回采过程中因顶板压力造成的倾斜进行控制，该支架控制方法中所使用的液压支架包括支架顶梁3、支架底座6、支架掩护梁4、支架尾梁5、位于支架顶梁和支架底座之间的前排支架立柱1和后排支架立柱1’、在前排支架立柱1’上设置的前排卸压阀2、以及在后排支架立柱1’上设置的后排卸压阀2’，在本方法中，使前排卸压阀2和后排卸
压阀2’相互独立地卸压，当顶板压力不均时通过前排卸压阀2或后排卸压阀2’的自动卸荷，可布局降低支架顶梁3的前部或后部高度，进而防止支架底座的翘离地面。As shown in FIG. 1 and FIG. 2, the hydraulic support control method of the present invention is used for controlling the tilt caused by the pressure of the top plate during the mining process of the hydraulic support. The hydraulic support used in the support control method includes the support top beam. 3. The bracket base 6, the bracket cover beam 4, the bracket tail beam 5, the front row support column 1 and the rear row support column 1' located between the bracket top beam and the bracket base, and the front set on the front row support column 1' The discharge pressure relief valve 2 and the rear discharge pressure relief valve 2' disposed on the rear support column 1', in the method, the front discharge pressure relief valve 2 and the rear discharge valve
The pressure valve 2' is independently depressurized, and when the top plate pressure is uneven, the front or rear height of the bracket top beam 3 can be reduced by the automatic unloading of the front discharge pressure relief valve 2 or the rear discharge pressure relief valve 2'. , thereby preventing the base of the bracket from tilting off the ground.
根据本发明的液压支架控制方法，支架立柱响应顶板压力不均，通过支架立柱被动卸压的方式来布局降低支架立柱的高度，即在顶板压力不均匀时，受力较大支柱上的卸压阀能够及时开启，主动卸压，局部降低支架顶梁，保证支架的平衡，使支架底座始终不脱离地面，达到防止支架倾斜而引起后续工作故障的目的，如图1所示，支架顶梁在前排支架立柱卸压后呈下倾状态。According to the hydraulic bracket control method of the present invention, the support column is responsive to the uneven pressure of the top plate, and the height of the support column is reduced by the passive pressure relief of the support column, that is, when the pressure of the top plate is uneven, the pressure on the large pillar is relieved. The valve can be opened in time, actively relieve pressure, partially reduce the top beam of the bracket, ensure the balance of the bracket, so that the bracket base does not leave the ground at all times, so as to prevent the bracket from tilting and causing subsequent work failure, as shown in Fig. 1, the bracket top beam is The front row of the column is in a downwardly inclined state after being depressurized.
在一实施例中，对液压支架的支架顶梁的前端或后端允许下降的距离或位置进行预先设定，若超出该设定，则停止卸压并且进行报警，提示故障，以在满足液压支架安全支护的前提下、满足其他运行设备等其他要求或满足。其中，大型液压支架的前端或后端一般允许降低2m，小型液压支架的前端或后端一般允许降低1m，如此，在大部分工作场合均能达到防止支架底座翘离地面而不影响其他设备工作的要求。上述预先设定例如通过布置接近开关以对支架顶梁的前端或后端的终止位置进行检测，或者通过＝角度传感器对顶梁支架的倾斜角度进行检测。In an embodiment, the front end or the rear end of the bracket top beam of the hydraulic bracket is allowed to be preset in a descending distance or position. If the setting is exceeded, the pressure relief is stopped and an alarm is issued to indicate a fault to satisfy the hydraulic pressure. Under the premise of the bracket safety support, meet other requirements or meet other operating equipment. Among them, the front end or the rear end of the large hydraulic support is generally allowed to be reduced by 2 m, and the front end or the rear end of the small hydraulic support is generally allowed to be lowered by 1 m. Thus, in most working situations, the support base can be prevented from tilting off the ground without affecting other equipment work. Requirements. The above-described preset is detected by, for example, arranging the proximity switch to detect the end position of the front end or the rear end of the bracket top beam, or detecting the inclination angle of the top beam bracket by the = angle sensor.
在一实施例中，上述后排卸压阀的卸压阈值大于前排卸压阀的卸压阈值。例如前排卸压阀的卸压阈值为40MPa，后排卸压阀的卸压阈值为35MPa。在一般工作面回采场合，卸压阈值的选择范围为35MPa-45MPa之间。在本实施例中，可根据实际回采工作面的要求来设定卸压阈值。In an embodiment, the pressure relief threshold of the rear discharge pressure relief valve is greater than the pressure relief threshold of the front discharge pressure relief valve. For example, the pressure relief threshold of the front discharge pressure relief valve is 40 MPa, and the pressure relief threshold of the rear discharge pressure relief valve is 35 MPa. In the general working face mining, the pressure relief threshold is selected between 35MPa and 45MPa. In this embodiment, the pressure relief threshold can be set according to the requirements of the actual working face.
本发明不仅适用于前排支架立柱和后排支架立柱仅有一根支柱的场合，也适合在前、后排支架立柱为两根的场合使用，此时前排支架立柱的卸压阀动作联动，后排支架立柱的卸压阀动作联动。The invention is applicable not only to the case where the front support column and the rear support column have only one pillar, but also to the case where the front and rear row support columns are two, and the pressure relief valve of the front support column is interlocked. The pressure relief valve of the rear support column acts in linkage.
如图1至图4所示，本发明提供了一种前后柱分体卸压液压支架，包括支架顶梁3、支架底座6、支架掩护梁4、支架尾梁5、位于支架顶梁和支架底座之间的同步运动的前排支架立柱1和同步运动的后排支架立柱1’，还包括在前排支架立柱1上设置的前排卸压阀2、以及在后排支架立柱1’上设置的后排卸压阀2’，其中，前排支架立柱1通过前排卸压阀2与乳化液箱15连通，后排支架立柱1’通过后排卸压阀2’与乳化液箱15连通。As shown in FIG. 1 to FIG. 4, the present invention provides a front and rear column split pressure relief hydraulic support, comprising a bracket top beam 3, a bracket base 6, a bracket cover beam 4, a bracket tail beam 5, a bracket top beam and a bracket. The front row of the column 1 and the synchronously arranged rear column 1' of the synchronous movement between the bases further include a front row of pressure relief valves 2 disposed on the front row of column 1 and a rear column 1' The rear discharge pressure relief valve 2' is disposed, wherein the front support column 1 communicates with the emulsion tank 15 through the front discharge pressure relief valve 2, and the rear support column 1' passes through the rear discharge pressure relief valve 2' and the emulsion tank 15 Connected.
与现有防止支架倾斜方式相比，本发明有益效果体现在：本发明前后柱分体式液压支架，在液压支架支柱上设置有卸压阀，在顶板压力不均匀时，受力较大支柱上的卸压阀能够及时开启，主动卸压，局部降低支架顶梁，保证支架的平衡，达到防止支架倾斜的目的。
Compared with the existing method for preventing the tilt of the bracket, the beneficial effects of the present invention are as follows: the front and rear column split type hydraulic support of the present invention is provided with a pressure relief valve on the hydraulic support pillar, and when the pressure of the top plate is uneven, the force is applied to the pillar. The pressure relief valve can be opened in time, actively relieve pressure, partially reduce the top beam of the bracket, ensure the balance of the bracket, and achieve the purpose of preventing the bracket from tilting.
在一实施例中，如图3所示，针对前排支架立柱和后排支架立柱均为两根立柱的液压支架，前排支架立柱的两个支架立柱共用同一卸压阀2，后排支架立柱的两个支架立柱共用同一卸压阀2’，前排卸压阀和后排卸压阀分别包括第一液控端21和第二液控端22，第一液控端21和第二液控端22分别与一个立柱的乳化液腔连通。In an embodiment, as shown in FIG. 3, the front support column and the rear support column are two hydraulic supports of the vertical column, and the two support columns of the front support column share the same pressure relief valve 2, and the rear support The two support columns of the column share the same pressure relief valve 2', and the front discharge pressure relief valve and the rear discharge pressure relief valve respectively include a first hydraulic control end 21 and a second hydraulic control end 22, a first hydraulic control end 21 and a second The hydraulic terminals 22 are respectively in communication with the emulsion chamber of a column.
在本实施例中，前排的两个支架立柱共用同一卸压阀，并且将两个支架立柱的乳化液压力分别引入卸荷阀，并且分别独立地作用在卸荷阀的阀芯上，此时卸荷压力的卸荷阈值则由两个支架立柱的乳化液的压力的线性叠加，例如A*40MPa+B*45MPa，其中，A和B为≤1的权项系数。由两个支架立柱提供的两路乳化液在经过卸荷后汇流至乳化液箱，其中，在卸荷前这两路乳化液不汇流。In this embodiment, the two support columns of the front row share the same pressure relief valve, and the emulsion pressures of the two support columns are respectively introduced into the unloading valve, and respectively act on the valve core of the unloading valve, respectively. The unloading threshold of the unloading pressure is linearly superimposed by the pressure of the emulsion of the two scaffold columns, for example A*40 MPa+B*45 MPa, wherein A and B are weighting factors of ≤1. The two emulsions provided by the two support columns are discharged to the emulsion tank after unloading, wherein the two emulsions do not converge before unloading.
在一实施例中，针对前排支架立柱和后排支架立柱均为两根立柱的液压支架，如图4和图5所示，前排支架立柱的两根支架立柱分别设有卸压阀2a和卸压阀2b，并且卸压阀2a和卸压阀2b卸压动作相互关联，各卸压阀2a、2b分别包括本体、电控端23、以及在本体卸压动作时触发的常开开关25，一个卸压阀2a的常开开关25与另一个卸压阀2b的电控端23’串联，一个卸压阀2a的电控端23与另一个卸压阀2b的常开开关25’串联，并与电源构成联动控制回路。In one embodiment, the front support column and the rear support column are two hydraulic supports of the vertical column. As shown in FIG. 4 and FIG. 5, the two support columns of the front support column are respectively provided with a pressure relief valve 2a. And the pressure relief valve 2b, and the pressure relief valve 2a and the pressure relief valve 2b are pressure-removing actions, each of the pressure relief valves 2a, 2b includes a body, an electronic control terminal 23, and a normally open switch that is triggered when the body is relieved of pressure. 25. The normally open switch 25 of one pressure relief valve 2a is connected in series with the electronic control terminal 23' of the other pressure relief valve 2b, the electronically controlled end 23 of one pressure relief valve 2a and the normally open switch 25' of the other pressure relief valve 2b. Connected in series and connected to the power supply to form a control loop.
在本实施例中，卸压阀为电控卸压阀，其本体阀芯的运动选择性地由电控端(电磁线圈)驱动或先导压力驱动，当先导压力未达到卸压阈值时，由电控端是否得电来控制卸压动作，该电控端由另一卸压阀上的常开开关来控制，该常开开关的开关状态由所在的卸压阀的本体卸压时触发，从而形成卸压联动。In this embodiment, the pressure relief valve is an electronically controlled pressure relief valve, and the movement of the body valve core is selectively driven by the electronic control end (electromagnetic coil) or the pilot pressure. When the pilot pressure does not reach the pressure relief threshold, Whether the electric control terminal is energized to control the pressure relief action, the electronic control end is controlled by a normally open switch on another pressure relief valve, and the switch state of the normally open switch is triggered by the pressure relief of the body of the pressure relief valve. Thereby forming a pressure relief linkage.
在一实施例中，前排卸压阀和后排卸压阀均为卸压阈值可调的卸压阀。在一般回采场合，卸压阈值的可调范围在35MPa-45MPa之间。In an embodiment, the front discharge pressure relief valve and the rear discharge pressure relief valve are pressure relief valves with adjustable pressure relief thresholds. In the general mining occasion, the adjustable range of the pressure relief threshold is between 35MPa and 45MPa.
以上所述仅为本发明的优选实施例而已，并不用于限制本发明，对于本领域的技术人员来说，本发明可以有各种更改和变化。凡在本发明的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本发明的保护范围之内。
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 (10)
- 一种液压支架控制方法，用于对液压支架在工作面回采过程中因顶板压力造成的倾斜进行控制，所述液压支架包括支架顶梁、支架底座、支架掩护梁、支架尾梁、位于支架顶梁和支架底座之间的前排支架立柱和后排支架立柱、在所述前排支架立柱上设置的前排卸压阀、以及在所述后排支架立柱上设置的后排卸压阀，其特征在于，使前排卸压阀和后排卸压阀相互独立地卸压，当顶板来压不均时通过前排卸压阀或后排卸压阀的自动卸荷，来局部降低支架顶梁的前部或后部高度，以防止倾斜。A hydraulic support control method is used for controlling a tilt of a hydraulic support caused by a roof pressure during a working face recovery process, the hydraulic support comprises a bracket top beam, a bracket base, a bracket cover beam, a bracket tail beam, and a bracket top a front row of pillars and a rear row of pillars between the beam and the base of the bracket, a front row of pressure relief valves disposed on the front row of the pillars, and a rear pressure relief valve disposed on the pillars of the rear row of brackets, The utility model is characterized in that the front discharge pressure relief valve and the rear discharge pressure relief valve are independently depressurized, and when the top plate is unevenly pressed, the automatic relief of the front discharge pressure relief valve or the rear discharge pressure relief valve is used to locally reduce the support. The front or rear height of the top beam to prevent tilting.
- 根据权利要求1所述的液压支架控制方法，其特征在于，所述后排卸压阀的卸压阈值大于所述前排卸压阀的卸压阈值。The hydraulic support control method according to claim 1, wherein the pressure relief threshold of the rear discharge pressure relief valve is greater than the pressure relief threshold of the front discharge pressure relief valve.
- 根据权利要求2所述的液压支架控制方法，其特征在于，所述卸压阈值的选择范围为35MPa-45MPa之间。The hydraulic support control method according to claim 2, wherein the pressure relief threshold is selected from a range of 35 MPa to 45 MPa.
- 根据权利要求3所述的液压支架控制方法，其特征在于，所述前排卸压阀的卸压阈值为40MPa，所述后排卸压阀的卸压阈值为35MPa。The hydraulic support control method according to claim 3, wherein the pressure relief threshold of the front discharge pressure relief valve is 40 MPa, and the pressure relief threshold of the rear discharge pressure relief valve is 35 MPa.
- 根据权利要求1所述的液压支架控制方法，其特征在于，所述前排支架立柱和后排支架立柱均为两根，均匀分布在所述支架顶梁和支架底座之间。The hydraulic support control method according to claim 1, wherein the front support post and the rear support stand are both two, evenly distributed between the support top beam and the bracket base.
- 一种前后柱分体卸压液压支架，包括支架顶梁、支架底座、支架掩护梁、支架尾梁、位于支架顶梁和支架底座之间的前排支架立柱和后排支架立柱，其特征在于，还包括在所述前排支架立柱上设置的前排卸压阀、以及在所述后排支架立柱上设置的后排卸压阀，其中，所述前排支架立柱通过前排卸压阀与乳化液箱连通，所述后排支架立柱通过后排卸压阀与所述乳化液箱连通，所述前排卸压阀和后排卸压阀相互独立地卸压。A front and rear column split pressure relief hydraulic support, comprising a bracket top beam, a bracket base, a bracket cover beam, a support tail beam, a front support column and a rear support column between the support top beam and the support base, wherein The utility model further includes a front discharge pressure relief valve disposed on the front row of the pillars, and a rear discharge pressure relief valve disposed on the rear row of the pillars, wherein the front row of pillars passes through the front row of pressure relief valves And communicating with the emulsion tank, the rear row of the column is connected to the emulsion tank through the rear discharge pressure valve, and the front discharge pressure relief valve and the rear discharge pressure relief valve are independently relieved.
- 根据权利要求6所述的前后柱分体卸压液压支架，其特征在于，所述前排卸压阀和所述后排卸压阀均为卸压阈值可调的卸压阀。The front and rear column split pressure relief hydraulic support according to claim 6, wherein the front discharge pressure relief valve and the rear discharge pressure relief valve are pressure relief valves with adjustable pressure relief thresholds.
- 根据权利要求6所述的前后柱分体卸压液压支架，其特征在于，所述前排支架立柱的两个支架立柱共用同一卸压阀，所述后排支架立柱的两个支架立柱共用同一卸压阀，各所述卸压阀包括第一液控端和第二液控端，所述第一液控端和所述第二液控端分别与一个立柱的乳化液腔连通。The front and rear column split pressure relief hydraulic support according to claim 6, wherein the two support columns of the front row of stand columns share the same pressure relief valve, and the two support columns of the rear row of stand columns share the same The pressure relief valve includes a first hydraulic control end and a second hydraulic control end, wherein the first hydraulic control end and the second hydraulic control end respectively communicate with an emulsion chamber of a column.
- 根据权利要求6所述的前后柱分体卸压液压支架，其特征在于，所述前排支架立柱的两根支架立柱分别设有卸压阀并且形成卸压联动关系，所述后排支架立柱的两根支架立柱分别设有卸压阀并且形成卸压联动关系。 The front and rear column split pressure relief hydraulic support according to claim 6, wherein the two support columns of the front row of the stand column are respectively provided with a pressure relief valve and form a pressure relief linkage relationship, and the rear row support column The two support columns are respectively provided with pressure relief valves and form a pressure relief linkage relationship.
- 根据权利要求9所述的前后柱分体卸压液压支架，其特征在于，所述前排支架立柱的卸压阀包括本体、电控端、以及在所述本体卸压动作时触发而闭合的常开开关，其中，所述前排支架立柱的两个卸压阀中一个卸压阀的常开开关与另一个卸压阀的电控端串联电连接，以与电源构成联动控制回路。 The front and rear column split pressure relief hydraulic support according to claim 9, wherein the pressure relief valve of the front row of column supports comprises a body, an electronically controlled end, and is triggered and closed when the body is relieved of pressure. The normally open switch, wherein the normally open switch of one of the two pressure relief valves of the front row of the column is electrically connected in series with the electronic control end of the other pressure relief valve to form a linkage control loop with the power source.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110243671A (en) * | 2019-07-14 | 2019-09-17 | 湖南军成科技有限公司 | Three axis stress of one kind and counter-force structures |
| CN116357776A (en) * | 2023-06-02 | 2023-06-30 | 太原理工大学 | Three-way speed regulating valve for hydraulic support |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2832886A1 (en) * | 1978-07-27 | 1980-02-14 | Gewerk Eisenhuette Westfalia | Mine support shield hydraulic setting cylinder control - has pressure regulated valve hydraulically locking cylinder |
| CN201059199Y (en) * | 2007-06-14 | 2008-05-14 | 郑州四维机电设备制造有限公司 | Hydraulic support suitable for comprehensive mechanized caving coal working face |
| CN201671649U (en) * | 2010-05-31 | 2010-12-15 | 三一重型装备有限公司 | Hydraulic bracket |
| CN104213930A (en) * | 2014-09-10 | 2014-12-17 | 山东科技大学 | Parallel hydraulic support frame and application of parallel hydraulic support frame |
| CN106401634A (en) * | 2016-11-24 | 2017-02-15 | 安徽理工大学 | Hydraulic supporting frame achieving separate pressure relief of front pillar and rear pillar and control method for same |
-
2016
- 2016-11-24 WO PCT/CN2016/107131 patent/WO2018094656A1/en active Application Filing
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2832886A1 (en) * | 1978-07-27 | 1980-02-14 | Gewerk Eisenhuette Westfalia | Mine support shield hydraulic setting cylinder control - has pressure regulated valve hydraulically locking cylinder |
| CN201059199Y (en) * | 2007-06-14 | 2008-05-14 | 郑州四维机电设备制造有限公司 | Hydraulic support suitable for comprehensive mechanized caving coal working face |
| CN201671649U (en) * | 2010-05-31 | 2010-12-15 | 三一重型装备有限公司 | Hydraulic bracket |
| CN104213930A (en) * | 2014-09-10 | 2014-12-17 | 山东科技大学 | Parallel hydraulic support frame and application of parallel hydraulic support frame |
| CN106401634A (en) * | 2016-11-24 | 2017-02-15 | 安徽理工大学 | Hydraulic supporting frame achieving separate pressure relief of front pillar and rear pillar and control method for same |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110243671A (en) * | 2019-07-14 | 2019-09-17 | 湖南军成科技有限公司 | Three axis stress of one kind and counter-force structures |
| CN116357776A (en) * | 2023-06-02 | 2023-06-30 | 太原理工大学 | Three-way speed regulating valve for hydraulic support |
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