CN203383842U - Three-column-type paste-filling hydraulic support used for underground thin coal seam - Google Patents

Three-column-type paste-filling hydraulic support used for underground thin coal seam Download PDF

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Publication number
CN203383842U
CN203383842U CN201320326598.4U CN201320326598U CN203383842U CN 203383842 U CN203383842 U CN 203383842U CN 201320326598 U CN201320326598 U CN 201320326598U CN 203383842 U CN203383842 U CN 203383842U
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China
Prior art keywords
timber
hinged
jack
column
paste
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Expired - Fee Related
Application number
CN201320326598.4U
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Chinese (zh)
Inventor
范东升
康沿海
候巨涛
马伟山
董金龙
刘玉龙
尹章
郭东梅
于刚
杨菲
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SHANDONG XINMEI MACHINERY EQUIPMENT CO Ltd
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SHANDONG XINMEI MACHINERY EQUIPMENT CO Ltd
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Priority to CN201320326598.4U priority Critical patent/CN203383842U/en
Application granted granted Critical
Publication of CN203383842U publication Critical patent/CN203383842U/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Abstract

Disclosed is a three-column-type paste-filling hydraulic support used for an underground thin coal seam. The three-column-type paste-filling hydraulic support is characterized in that the hydraulic support is composed of a two-column-shield hydraulic support serving as a main body, a rear portion supporting top beam and a paste filling retaining plate pulling and moving mechanism, a rear top beam is hinged to an upper connecting body of the two-column-shield hydraulic support, a rear top beam upright is arranged, one end of the rear top beam upright is hinged to the rear top beam while the other end of the same is hinged on a base of the two-column-shield hydraulic support, the rear top beam upright and two front uprights form a stable three-point support, the paste filling retaining plate pulling and moving mechanism is hinged at the rear end of the base of the two-column-shield hydraulic support, and comprises a pulling and moving jack with one end hinged to the base and the other end hinged with a pulling and moving seat, and an adjusting jack with one end hinged on the pulling and moving seat and the other end hinged in the middle of a waste rock retaining plate, and the waste rock retaining plate is vertically hinged on the pulling and moving seat and can rotate around a hinging point in a direction facing or being away from the top beam. The three-column-type paste-filling hydraulic support is simple in structure and compact in design.

Description

Three pillar type paste filling hydraulic bracket for the down-hole girdle
Technical field
The utility model relates under the girdle coal mine coal-face and need to carry out to goaf the hydraulic prop equipment of paste body filling operation, specifically a kind of paste body filling of the three pillar type for down-hole girdle hydraulic support.
Background technology
Along with the continuous propelling of China's process of industrialization, energy demand is also being increased year by year, particularly, to the demand of coal, within very long one period, coal will be the main body of China's energy demand.
The quickening day by day of coal in China exploitation paces, increasing mine is faced with the resource exhaustion problem, high seam and easily production of resources day by day reduce, so girdle particularly the exploitation of " three next on " coal resources become extremely urgent problem.
Girdle particularly " three next on " exploitation of coal resources difficult problem is as follows:
1, girdle " three next on " exploitation of coal resources subsidence later particularly, destroyed earth's surface building and carrying water body, causes a series of environment and social concern.
2, girdle " three next on " exploitation of coal resources particularly, the supporting structure complexity in the past used, support post is not easy to operation more, and the heavy exploitation of support input cost is high.
3, girdle " three next on " exploitation of coal resources particularly often is subject in reality exploitation stowing operation, and filling space is little, and the fill area top board is difficult to safeguard, the packing job seal is bad waits restriction, and at the bottom of the efficiency of resource exploitation, cost is high.
For solving particularly " three next on " exploitation of coal resources problem of girdle, by adopt traditional coal-mining method be not suitable for this specific condition and at present China propose the economic utilization of resource and the needs of protection of the environment.
Summary of the invention
The purpose of this utility model is to provide a kind of paste body filling of the three pillar type for girdle hydraulic support, by the utility model, has solved particularly " three next on " exploitation of coal resources difficult problem of girdle.
For achieving the above object, the technical program is as follows:
A kind of paste filling hydraulic bracket of the three pillar type for the down-hole girdle, the two column protected type hydraulic support of take is main body, additional rear portion support top beam and a paste body filling baffle plate pull body form;
The upper disjunctor of rear back timber and two column protected cribbing is hinged; Back timber column after being provided with one, the hinged rear back timber of an end of rear back timber column, the other end are hinged on the base of two column protected cribbing, and have formed stable supported at three point with two front columns;
The base rear end of two column protected cribbing is hinged with paste body filling baffle plate pull body, described paste body filling baffle plate pull body comprises drawing and moves jack, draw and move jack one end articulated base, the other end is hinged with to draw and moves seat, draw to move on seat vertically to be hinged with waste rock board, waste rock board can around pin joint towards and away from the back timber direction, rotate, also include an adjusting jack, adjusting jack one end is hinged on to draw and moves seat above, and the other end is hinged on the middle part of waste rock board.
Further, front back timber, rear back timber are the hinged combined type caving shield bracket institution of same axis with the upper disjunctor of shielding.
Further, the rear end of described rear back timber is hinged is provided with rear extensible canopy, and the middle part of rear extensible canopy is hinged with rear flexible jack, and the other end of rear flexible jack is hinged on rear back timber.
Further, described drawing moved seat and is provided with vertical individual prop, and the lower end of vertical individual prop is fixed on draws that to move seat upper and be positioned at the inboard of waste rock board.
Further, described drawing moved jack and is provided with side by side two, described draw move jack two ends by the cross connector with base or draw and move seat and be connected.
Further, described rear back timber pillar is positioned at the base rear middle part, and two sinciput beam stanchions and rear back timber pillar form isosceles triangle, and rear back timber pillar is positioned at the place, drift angle summit of isosceles triangle.
Further, the front rod of the quadric chain of this support is that monotroded bar, back link are the monolithic double link, be provided with two balance jack between disjunctor in front back timber and shielding, and two balance jack is arranged symmetrically in the front rod both sides.
Further, forward and backward back timber and forward and backward extensible canopy are all the box structures formed by Plate Welding, in forward and backward back timber, are provided with slideway, and forward and backward extensible canopy correspondence is arranged in slideway, handle that forward and backward extensible canopy jack can make to protract, the retrude beam slides on slideway, carry out flexible.
Further, described waste rock board, draw move the seat be all the box structure formed by Plate Welding.
Further, described waste rock board is telescopic structure: comprise waste rock board casing, telescopic baffle, spring jack assembly and the elastic rubber gasket that is fixed on the telescopic baffle upper end.First by spring, telescopic baffle is released during use, relied on the elastic rubber gasket of telescopic baffle upper end to be sealed uneven baffle plate, then have jack that telescopic baffle is fixed, thereby form an airtight reliable fill area.
Operating principle of the present utility model and the course of work are as follows:
It is main body that this hydraulic support be take a two column protected type hydraulic support, sets up the rear portion support top beam and a paste body filling baffle plate pull body forms; The back space of paste body filling consists of jointly rear portion support top beam and paste body filling baffle plate pull body.
Rear back timber adds extensible canopy: paste filling hydraulic bracket is generally two to three step pitches of mining, and then carry out paste body filling, so after in coal mining and stowing operation, back timber top top board has one section empty top zone territory, for the top board spoil Mao that avoids the empty top zone territory falls to affecting the safety in packing job zone, therefore be designed with extensible canopy at rear back timber, extensible canopy can stretch out in time and protect top temporarily, ensures the safety in packing job zone.
The rear portion back timber is hinged on the upper connecting rod of four connecting rods, and is controlled by the rear back timber column be hinged on base, be mainly used in as the rear portion paste body filling provides reliable and stable operating space,
Paste body filling baffle plate pull body comprises drawing and moves jack, draws and move seat and waste rock board forms, and is mainly used in paste body filling zone, rear portion is carried out airtight fixing, is the safe and reliable protective barrier of operating area and fill area.
After supporting, the column of back timber is single upright column, for increasing the filling space, rear portion, becomes possibility; Rear back timber is easy to realize the roof control of rear portion fill area with extensible canopy, the good leak tightness of paste body filling baffle plate pull body to fill area has again two drawing to move jack and vertical monomer column and move seat and be fixed and make paste body filling more solid and reliable drawing.
This quadric chain for the three pillar type paste body filling hydraulic support of girdle consists of disjunctor and base in single front rod, the two back links of monolithic, shielding, its compact conformation, and balance jack adopts two balance jack designs, increases stability.
Forward and backward back timber all is built-in with extensible canopy, can stretch out in time top board is carried out to temporary lining.
Establish the base rear middle part for the strong point of rear back timber column that supports rear back timber, with two front columns, formed stable supported at three point mechanism.
Front back timber, rear back timber are combined type caving shield bracket institution of the hinged formation of same axis with the upper disjunctor of shielding, have improved the support force of rear back timber, have increased the back space of paste body filling.
Base advancing jack top upside-down mounting: the cylinder bottom of advancing jack is connected to support gap bridge rear portion, the piston rod of advancing jack is connected with push rod backwards, can increase the power of trying to stop people from fighting each other, push rod is whole long pusher structure, long push rod is because the body of rod is contained in base relatively many, control push rod clearance simultaneously, can effectively prevent the downslide of anterior conveyer.
Draw and move that jack is anterior to be connected with base by the cross connector, rear portion by the cross connector with draw move the seat be connected, both can draw and move forward with the variation of stowing interval paste body filling baffle plate pull body, can give and the thrust of filling backward the rear portion fill paste when filling by the lotion baffle plate again.
Described waste rock board is telescopic structure, during use, first by spring, telescopic baffle is released, rely on the elastic rubber gasket of telescopic baffle upper end to be sealed uneven baffle plate, by jack, telescopic baffle is fixed again, thereby form an airtight reliable fill area with back timber, rib, and telescopic lotion waste rock board relies on the interaction energy of regulating jack to carry out suitable front and back adjusting to fill paste.
For guaranteeing paste body filling baffle plate pull body, do not tumble, can be used for the in addition anchoring of individual prop that roof supporting and drawing moves seat: when lotion carries out filling, paste body filling baffle plate pull body and top board and goaf form airtight fill area, because fill paste needs certain setting time (approximately 24 hours), during this period of time due to the pressure of top board, fill paste can draw and move seat a thrust forward arranged the filling baffle plate, for prevent the filling baffle plate draw move the seat move forward or tumble, therefore need draw and move seat and be fixed the filling baffle plate during filling, laterally fixingly by two, move drawing of being connected and move jack with drawing, vertically fix to be fixed on to draw by vertical individual prop one end and move on seat, upper end withstands on top board fixing.
In a word, two column protected cribbing is combined with paste body filling coal winning technology technology, form three pillar type paste body filling hydraulic support, make the exploitation frame type of girdle " three next on " coal resources that new breakthrough arranged: the utility model is the paste body filling hydraulic support, paste body filling has the advantages such as filling effect is good, and the post-placement settling rate is little; The utility model is the paste body filling hydraulic support, and breaking through routine is that the three pillar type construction is simple, and main body is two column protected cribbing, and empty top ability is strong, easy operating, and the support relative weight is light.Exploitation work plane control and management top board and coal winning technology at girdle " three next on " coal resources are opened up again the Yi Tiaoxin road, have created world level.
To sum up, appearance of the present utility model, solved this type of exploitation of coal resources difficult problem to a certain extent.This hydraulic rack structure is simple, compact to design, the little relative weight of volume gently be suitable for girdle particularly the exploitation of " three next on " coal resources use, and be again coal mining three pillar type hydraulic support commonly used, simple to operation, maintenance management is with low cost.Paste body filling formula exploitation has again that resource recovery is high, limit of mining large, alleviate subsidence, reduce water resource destruction, reduce the tunnelling rate, improve the mine safety guarantee, improve the advantages such as mine service-life.
The accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present application or technical scheme of the prior art, below will the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described, apparently, the accompanying drawing the following describes is only some embodiment that put down in writing in the application, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing;
Fig. 1 is the front view of the utility model hydraulic support;
Fig. 2 is the utility model hydraulic support foundation top view;
Fig. 3 is that the paste body filling baffle plate pull body master of the utility model hydraulic support looks schematic diagram;
The paste body filling baffle plate pull body schematic top plan view that Fig. 4 is the utility model hydraulic support.
The specific embodiment
The correlation technique content of below not addressing all can adopt or use for reference prior art.
In order to make those skilled in the art person understand better the technical scheme in the application, below in conjunction with the accompanying drawing in the embodiment of the present application, technical scheme in the embodiment of the present application is clearly and completely described, obviously, described embodiment is only the application's part embodiment, rather than whole embodiment.Embodiment based in the application, those of ordinary skills are not making under the creative work prerequisite the every other embodiment obtained, and all should belong to the scope of the application's protection.
As shown in Figure 1, Figure 2, shown in Fig. 3,4, Fig. 1 has dotted that elastic beam stretches out state and telescopic lotion retaining device stretches out state and drawing the monomer supporting position of moving on seat.
This hydraulic support mainly comprises that three parts form: two column protected type hydraulic support main body, rear portion support top beam, paste body filling baffle plate pull body in the present embodiment.
It consists of in detail:
Two column protected type hydraulic support main part comprises: disjunctor 3, front rod 5, back link 6, base 4, push rod 11, column 9, advancing jack 10, front stretching beam jack 18, balance jack 8 in front back timber 1, front stretching beam 7, shielding; Wherein: the front rod of the quadric chain of this support is that monotroded bar, back link are the monolithic double link, be provided with two balance jack between disjunctor in front back timber and shielding, and two balance jack is arranged symmetrically in the front rod both sides; This two column protected type hydraulic support remaining part connected mode all can adopt prior art.
The rear portion support top beam comprises: rear back timber 2, rear extensible canopy 17, rear extensible canopy jack 19, and back timber column 12 after.Wherein: described rear back timber, upper connecting rod, front back timber are articulated in a bit, and front back timber, rear back timber are combined type caving shield bracket institution of the hinged formation of same axis with the upper disjunctor of shielding; The hinged rear back timber of one end of rear back timber column, the other end are hinged on the base rear middle part of two column protected cribbing, such two sinciput beam stanchions and rear back timber pillar form isosceles triangle, rear back timber pillar is positioned at the place, drift angle summit of isosceles triangle, has formed stable supported at three point mechanism; Described rear extensible canopy is hinged on the rear end of rear back timber, the hinged rear flexible jack in the middle part of rear extensible canopy, and the other end of rear flexible jack is hinged on rear back timber.
Paste body filling baffle plate pull body comprises: two draw move jack 13, draw move seat 14, telescopic lotion retaining device 15, two is regulated jack 16, cross connector 20 and individual props 21.Wherein: two draw and move the jack parallel distributed: an end is by cross connector articulated base, and the other end moves seat by hinged the drawing of cross connector, draw and move a upper vertical hinged waste rock board, waste rock board can around pin joint towards and away from the back timber direction, rotate; Two regulate jack is positioned to draw and moves a both sides, and an end is hinged on and draws that to move seat upper, and the other end is hinged on the middle part of waste rock board; Guaranteeing under the rational prerequisite of stowing interval, better filling and support space, rear portion is safeguarded, also be designed with the Support Position of monomer supporting seat 23 in the waste rock board inboard of paste body filling baffle plate pull body, can be used for the in addition anchoring of individual prop 21 that roof supporting and drawing moves seat 14, assurance paste body filling baffle plate pull body is not tumbled, and can work.
Forward and backward back timber and forward and backward extensible canopy are all the box structures formed by Plate Welding, be provided with slideway in forward and backward back timber, forward and backward extensible canopy correspondence is arranged in slideway, handles that forward and backward extensible canopy jack can make to protract, the retrude beam slides on slideway, carries out flexible; Described waste rock board, draw move the seat be all also the box structure formed by Plate Welding.
Two column protected type hydraulic support of the present utility model is main body, main column 9 and the front back timber 1 of leaning on born the supporting to top board, adopt coal-winning machine and scratch board conveyor provides supporting shielding space for combining, and to carry out pushing and sliding and move the working cycles that frame completes coal cutting, pushing and sliding, moves frame by the flexible and push rod 11 of the advancing jack 10 in the thrust gear of self; Front back timber 1 is built-in by front stretching beam 7, and operation front stretching beam jack 18 can make extensible canopy stretch out in time top board is carried out to temporary lining; Before two balance jack 8 connect, with screening upper disjunctor 3 to lean on the flexible attitude of adjusting whole support of balance jack 8 to make front back timber 1, better contact top board carries out better supporting and maintenance to top board to back timber 1; The core of support: " quadric chain " is comprised of the upper disjunctor 3 of shielding, front rod 5, back link 6, base 4 path curves that the support working motion regulates support by " quadric chain " exactly and guarantees that hydraulic support has a reasonable distribution of force in down-hole, thus ensure hydraulic support safety, stable, work reliably.
Rear portion support top beam mechanism, it is well that a combined type hydraulic shield support combines and created a kind of brand-new frame type with paste body filling supporting maintenance by the two column protected type deformation of timbering; Its operating principle is: rear back timber 2 is articulated as one with front back timber 1 and the upper disjunctor 3 of shielding, be provided with the rear back timber column 12 of a strong point in base 4 rear middle part in rear back timber 2 bottoms, rear back timber column 12 has formed stable supported at three point with front two root posts 9, can effectively to support rear portion fill area, carry out roof timbering.
Itself be exactly the utility model innovation by the design of the strong point of back timber column 12 after in base 4 rear middle part, make the rear portion supporting of packed hydroalic support safeguard that a kind of more novel method for designing has been arranged:
1, broken through in Design of Powered Supports, the column that back timber is supported is all the traditional design thinking of even number, simplified the support Design structure, having created " three 3, post firm support " application, current home and abroad in Design of Powered Supports does not also have three post hydraulic supports;
2, this support be take two column protected cribbing and is supported on the base rear portion by a root post as the hinged rear back timber of main body, project organization simply is easy to realize the simplification of operation, the support relative weight is light, with same working resistance, the hydraulic support phase weight/power ratio of height of the same race is relatively light by 20%~30%, drop into generally higher situation of cost of ton coal for current paste body filling exploitation, this support has very high economic results in society;
3, this paste body filling hydraulic support, after supporting, the column of back timber is that single upright column is to increase the filling space, rear portion to become possibility, the good leak tightness of special paste body filling baffle plate pull body to fill area, have again two drawing to move jack and vertical monomer column and move seat and be fixed and make paste body filling more solid and reliable drawing; Rear back timber 2 is built-in by rear extensible canopy 17, and after operation, extensible canopy jack 19 can make extensible canopy stretch out in time rear portion fill area top board is carried out to temporary lining;
Also be designed with paste body filling baffle plate pull body at the rear portion of hydraulic support, paste body filling baffle plate pull body is the core institution that paste body filling technique can work.Paste body filling baffle plate pull body moves by drawing that jack 13 is anterior to be connected with base 4 by cross connector 20, rear portion is moved seat and 14 is connected with drawing by cross connector 20, both can draw and move forward with the variation of stowing interval paste body filling baffle plate pull body, can give and the thrust of filling backward the rear portion fill paste when the filling by telescopic lotion retaining device 15 again.Telescopic lotion waste rock board 15 relies on the interaction energy of regulating jack 16 to carry out suitable front and back to fill paste and regulates.For guaranteeing that paste body filling baffle plate pull body do not tumble, can be used for roof supporting and draw the in addition anchoring of individual prop 21 that moves seat 14; Whole paste body filling baffle plate pull body can guarantee the smooth uniformity of whole filling face by drawing the filling position of moving about engaging lug 22 is connected with the paste body filling baffle plate pull body of adjacent frame to adjust again.
The above is only the application's preferred embodiment, makes those skilled in the art can understand or realize the application.Multiple modification to these embodiment will be apparent to one skilled in the art, and General Principle as defined herein can be in the situation that do not break away from the application's spirit or scope, realization in other embodiments.Therefore, the application will can not be restricted to these embodiment shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.

Claims (10)

1. the paste filling hydraulic bracket of the three pillar type for the down-hole girdle, it is characterized in that: the two column protected type hydraulic support of take is main body, additional rear portion support top beam and a paste body filling baffle plate pull body form;
The upper disjunctor of rear back timber and two column protected cribbing is hinged; Back timber column after being provided with one, the hinged rear back timber of an end of rear back timber column, the other end are hinged on the base of two column protected cribbing, and have formed stable supported at three point with two front columns;
The base rear end of two column protected cribbing is hinged with paste body filling baffle plate pull body, described paste body filling baffle plate pull body comprises drawing and moves jack, draw and move jack one end articulated base, the other end is hinged with to draw and moves seat, draw to move on seat vertically to be hinged with waste rock board, waste rock board can around pin joint towards and away from the back timber direction, rotate, also include an adjusting jack, adjusting jack one end is hinged on to draw and moves seat above, and the other end is hinged on the middle part of waste rock board.
2. the three pillar type paste filling hydraulic bracket of down-hole according to claim 1 girdle is characterized in that: front back timber, rear back timber are the hinged combined type caving shield bracket institution of same axis with the upper disjunctor of shielding.
3. the three pillar type paste filling hydraulic bracket of down-hole according to claim 1 and 2 girdle, it is characterized in that: the rear end of described rear back timber is hinged is provided with rear extensible canopy, the middle part of rear extensible canopy is hinged with rear flexible jack, and the other end of rear flexible jack is hinged on rear back timber.
4. the three pillar type paste filling hydraulic bracket of down-hole according to claim 1 girdle is characterized in that: described drawing moved seat and is provided with vertical individual prop, and the lower end of vertical individual prop is fixed on draws that to move seat upper and be positioned at the inboard of waste rock board.
5. the three pillar type paste filling hydraulic bracket of down-hole according to claim 1 girdle is characterized in that: described drawing moved jack and is provided with side by side two, described draw move jack two ends by the cross connector with base or draw and move seat and be connected.
6. the three pillar type paste filling hydraulic bracket of down-hole according to claim 1 girdle, it is characterized in that: described rear back timber pillar is positioned at the base rear middle part, two sinciput beam stanchions and rear back timber pillar form isosceles triangle, and rear back timber pillar is positioned at the place, drift angle summit of isosceles triangle.
7. the three pillar type paste filling hydraulic bracket of down-hole according to claim 1 girdle, it is characterized in that: the front rod of the quadric chain of this support is that monotroded bar, back link are the monolithic double link, be provided with two balance jack between disjunctor in front back timber and shielding, and two balance jack are arranged symmetrically in the front rod both sides.
8. the three pillar type paste filling hydraulic bracket of down-hole according to claim 1 girdle, it is characterized in that: forward and backward back timber and forward and backward extensible canopy are all the box structures formed by Plate Welding, be provided with slideway in forward and backward back timber, forward and backward extensible canopy correspondence is arranged in slideway, handle that forward and backward extensible canopy jack can make to protract, the retrude beam slides on slideway, carry out flexible.
9. the three pillar type paste filling hydraulic bracket of down-hole according to claim 1 girdle is characterized in that: described waste rock board, draw that to move seat be all the box structure formed by Plate Welding.
10. according to the three pillar type paste filling hydraulic bracket of the described down-hole of claim 1 or 9 girdle, it is characterized in that: described waste rock board is telescopic structure: comprise waste rock board casing, telescopic baffle, spring jack assembly and the elastic rubber gasket that is fixed on the telescopic baffle upper end; First by spring, telescopic baffle is released during use, relied on the elastic rubber gasket of telescopic baffle upper end to be sealed uneven baffle plate, then have jack that telescopic baffle is fixed, thereby form an airtight reliable fill area.
CN201320326598.4U 2013-06-07 2013-06-07 Three-column-type paste-filling hydraulic support used for underground thin coal seam Expired - Fee Related CN203383842U (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103306697A (en) * 2013-06-07 2013-09-18 山东新煤机械装备股份有限公司 Three-column paste body filling hydraulic bracket for underground thin coal seam and four-step paste body filling process
CN103775117A (en) * 2014-02-18 2014-05-07 陕西开拓建筑科技有限公司 Waste-rock-blocking top-cutting mold-hanging gob-side entry retaining hydraulic bracket for mining working face

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103306697A (en) * 2013-06-07 2013-09-18 山东新煤机械装备股份有限公司 Three-column paste body filling hydraulic bracket for underground thin coal seam and four-step paste body filling process
CN103775117A (en) * 2014-02-18 2014-05-07 陕西开拓建筑科技有限公司 Waste-rock-blocking top-cutting mold-hanging gob-side entry retaining hydraulic bracket for mining working face
CN103775117B (en) * 2014-02-18 2016-02-10 陕西开拓建筑科技有限公司 Face gear cash is cut top and is hung mould gob side entry retaining hydraulic support

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