CN113653524A - Broken roof is synthesized and is adopted face hydraulic support withdrawal triangular space temporary support device - Google Patents
Broken roof is synthesized and is adopted face hydraulic support withdrawal triangular space temporary support device Download PDFInfo
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- CN113653524A CN113653524A CN202111107497.3A CN202111107497A CN113653524A CN 113653524 A CN113653524 A CN 113653524A CN 202111107497 A CN202111107497 A CN 202111107497A CN 113653524 A CN113653524 A CN 113653524A
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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
- E21D23/04—Structural features of the supporting construction, e.g. linking members between adjacent frames or sets of props; Means for counteracting lateral sliding on inclined floor
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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
- E21D23/03—Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor having protective means, e.g. shields, for preventing or impeding entry of loose material into the working space or support
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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
- E21D23/04—Structural features of the supporting construction, e.g. linking members between adjacent frames or sets of props; Means for counteracting lateral sliding on inclined floor
- E21D23/06—Special mine caps or special tops of pit-props for permitting step-by-step movement
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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
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- Mining & Mineral Resources (AREA)
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Abstract
A temporary support device for a withdrawing triangular area of a hydraulic support of a broken roof fully mechanized mining surface belongs to the underground mining support field of underground coal mines and aims to realize the safe and rapid withdrawing of the hydraulic support of the fully mechanized mining surface, thereby improving the integral withdrawing efficiency of the fully mechanized mining equipment, the invention adopts a four-column supporting hydraulic support and a concave two-column shielding hydraulic support to form a triangular area temporary supporting support group in a front-back matching way, the triangular area of the broken roof fully-mechanized coal mining face hydraulic support withdrawing process is subjected to gapless safe and quick temporary support, the two groups of temporary support groups in a single direction are sequentially moved to the end part from the middle initial support position along with the fully-mechanized coal mining face hydraulic support withdrawing from the middle part of the working face, the triangular area at the edge of the end part position of the support of the working face to be withdrawn is ensured to be in a real-time support state, and a safe operation space is provided for the quick withdrawing of the fully-mechanized coal mining face support.
Description
Technical Field
The invention belongs to the field of underground mining support of underground coal mines, and particularly relates to a temporary support device for a retracting triangular area of a hydraulic support of a broken roof fully-mechanized mining surface.
Background
With the continuous deepening of the research theory and the continuous development of the fully mechanized mining technical equipment, a plurality of fully mechanized mining working faces realize high yield and high efficiency, under the condition of rapid propulsion, the mining period of a single fully mechanized mining working face is shorter and shorter, and the corresponding times of moving and reversing faces are increased gradually within a certain time range. The existing fully-mechanized mining technical equipment is larger and larger, particularly the powerful fully-mechanized mining hydraulic supports are large in quantity and weight, and the support withdrawing difficulty is increased in a limited withdrawing channel. To the relative broken working face that combines of roof, receive the influence of the concentrated stress of equidirectional in the regional not withdrawing passageway triangular space, the migration of the regional roof overlying rock stratum of triangle-shaped is violent to the support withdrawal in-process, and the broken degree further improves, leads to this regional roof to maintain the degree of difficulty and increases by a wide margin, has restricted hydraulic support's quick withdrawal, has certain potential safety hazard simultaneously.
The triangular region temporary support of the existing underground coal mine withdrawing working face generally adopts wood piles, single upright posts, matched I-shaped steel beams and the like for supporting, and the supporting modes have certain limitations and are mainly shown in the following aspects:
(1) the supporting efficiency is low. The temporary support in the triangular area mainly depends on manual operation, the labor intensity is high, the support speed is low, the integral withdrawing speed of the hydraulic support is limited, and meanwhile, the single upright post is high in danger and has certain potential safety hazards.
(2) The resource consumption is severe. The materials such as the wood buttress for the temporary support of the triangular area can be left in the goaf only once, and a large number of single hydraulic struts cannot be recovered and left in the goaf, so that the resource consumption is serious, and the withdrawal cost is increased.
(3) The supporting effect is poor. For the retracting working face of the broken top plate, the triangular area is further increased in the breaking degree influenced by the concentrated stress in different directions, the supporting effect of the supporting mode on the broken top plate is poor, and the risk of local top plate falling exists.
Disclosure of Invention
The invention aims to provide a temporary support device and a support method for a broken roof fully mechanized mining face hydraulic support withdrawing triangular area, and aims to realize safe and rapid withdrawing of a fully mechanized mining face hydraulic support, so that the overall withdrawing efficiency of fully mechanized mining equipment is improved.
The invention adopts the following technical scheme:
the temporary support device for the retraction triangular area of the hydraulic support comprises two sets of embedded four-column support type hydraulic supports which are mutually pushed and pulled and concave two-column shield type hydraulic supports of an outer sleeve, which are arranged in the triangular area of the retraction working face in parallel, and the embedded four-column support type hydraulic supports and the concave two-column shield type hydraulic supports are connected in a front-back nested mode through a pushing oil cylinder.
Further, embedded four post support formula hydraulic support includes back timber I, telescopic sleeve, stand I and base I, the quantity of stand I is four, and the both ends of stand I are connected with back timber I and base I respectively, and telescopic one end is passed through the cross connector and is connected with back timber I, and the other end is connected with base I, and four stands I are located four apex angles of back timber I respectively, and the sleeve is located the center of four stands I.
Furthermore, the front end and the rear end of the top beam I are spherical end surfaces respectively, so that the situation that a metal net of a top plate is scratched in the moving process can be avoided, and broken rock blocks fall into a triangular area is avoided.
Furthermore, the front end and the rear end of the base I are respectively of an arc-shaped structure, so that the rapid moving of the frame is facilitated, and the frame can adapt to uneven fluctuation of a bottom plate of a supporting area.
Further, two post shield hydraulic support of spill include that the cross-section is the back timber II of character cut in bas-relief, shield the roof beam, preceding connecting rod, the back connecting rod, telescopic jack, stand II, base II and pass the roof beam, the one end of back timber II is connected with telescopic jack's one end, the other end of back timber II is connected with the one end of shielding the roof beam, the other end of shielding the roof beam is connected with the one end of back connecting rod, the other end and the base II of back connecting rod are connected, connect through preceding connecting rod between the bottom of shielding the roof beam and the base II, the one end of stand II is connected with the bottom of back timber II, the other end is connected with base II, pass the roof beam nestification in back timber II, telescopic jack's the other end and embedded four post support formula support's back timber I are connected.
Furthermore, the front end of the top beam II is of a spherical structure, so that the damage to a metal net in a triangular area in the supporting process is avoided.
Furthermore, a waste rock blocking plate is arranged on one side, close to the goaf, of the edge of the top beam II, the waste rock blocking plate is designed to be of an integral structure, the situation that in the supporting process, large waste rocks fall into a triangular area to damage the support can be avoided, and the broken top plate is supported without a gap in time.
Furthermore, stand II is two extending structure, and the range of strut height is wide, has good adaptability to the triangle support space.
The temporary support method for the withdrawing triangular area of the fully mechanized mining surface of the broken roof mainly comprises the following steps: after the working face is pushed to the stoping line, the fully mechanized mining equipment starts to be withdrawn in sequence, when the hydraulic support of the working face is withdrawn, the hydraulic support starts to be withdrawn from the middle part to the two ends in sequence, and after the first hydraulic support in the middle area is withdrawn, the temporary support group is erected to the position of the original first withdrawn support; and then sequentially withdrawing the second support and the third hydraulic support, adjusting the support direction of the temporary support group after the third support moves to the withdrawal channel, enabling the support moving direction of the support group to be perpendicular to the moving direction of the working face hydraulic support to form a support for the end triangular area, and circularly moving the temporary support group from the middle part of the working face to the end part along with the withdrawal of the working face support to finish the quick support for the end triangular area in the withdrawal process of the working face hydraulic support.
The invention has the following beneficial effects:
the invention adopts a four-column support type hydraulic support and a concave two-column shield type hydraulic support which are matched front and back to form a triangular area temporary support group, safe and quick temporary support is carried out on the triangular area in the process of withdrawing the hydraulic support of the broken roof fully mechanized mining working face, the temporary support group is sequentially moved from the middle part of the working face to the end part along with the sequential withdrawal of the fully mechanized mining hydraulic support from the middle part of the working face to the end part, the triangular area at the edge of the support of the working face to be withdrawn at the end part is ensured to be in a real-time support state, and a safe operation space is provided for the rapid withdrawal of the fully mechanized mining support. Compared with the traditional temporary support method for the triangular area of the withdrawing passage, the method changes the traditional temporary support mode, avoids a large amount of loss of support materials, realizes safe and quick mechanical support of the triangular area of the withdrawing working face, greatly reduces the labor intensity of operators, shortens the temporary support time, and improves the overall withdrawing efficiency of the fully mechanized mining support on the basis of ensuring timely safe support of the broken roof area.
When the concave top beams retract the working face support, two groups of concave top beams are arranged in parallel in the triangular area, and the concave top beams and the four-column support type hydraulic support form full-coverage support without gaps, so that the concave top beams are suitable for crushing a top plate.
Drawings
FIG. 1 is a general layout of the support of the crushing roof in the face of the withdrawal operation of the crushing roof of the present invention;
FIG. 2 is a front view of the overall structure of the support assembly in the face of the retracting operation of the present invention;
FIG. 3 is a top view of the support assembly of the present invention in the face of a retraction operation;
FIG. 4 is a drawing showing the contraction state of the telescopic jack of the concave top beam II of the concave two-column shield type hydraulic support;
FIG. 5 is a drawing showing the extended state of the telescopic jack of the concave top beam II of the concave two-column shield type hydraulic support according to the present invention;
FIG. 6 is a front view of a base of the temporary support apparatus of the present invention;
wherein: 1-a four-column support type hydraulic support; 2-concave two-column shield type hydraulic support; 3-fully mechanized mining working face hydraulic support; 4-top beam I; 5-a sleeve; 6-upright column I; 7-base I; 8-a cross connector; 9-pushing the oil cylinder; 10-top beam II; 11-a shield beam; 12-a front link; 13-rear link; 14-a telescopic jack; 15-column II; 16-base II; 17-pushing beam.
Detailed Description
The invention is further explained with reference to the accompanying drawings.
A triangular region temporary support bracket group used in a fully mechanized mining face hydraulic bracket rapid withdrawal temporary support technology is composed of a support type hydraulic bracket and a concave shield type bracket, the support type hydraulic bracket and the concave shield type bracket are connected in a nested mode from front to back through a pushing jack and are mutually supported, the bracket is moved forwards along with the withdrawal circulation of the hydraulic bracket, the front portion of the two columns of concave shield type brackets is provided with a pushing beam, a triangular region crushing top plate can be maintained in time, the triangular region support height range of a withdrawal working face is well adapted, and the overall adaptability is improved.
The four-column supporting type hydraulic support consists of a top beam, a telescopic sleeve, an upright column, a base and a cross connector, has a stable integral structure, can well adapt to the spanning form of a roadway top plate, and provides a safe operation space for the retraction of the fully mechanized coal mining face support; the top beam is designed into an integral structure, and the front edge and the rear edge are designed into large-radius spherical end surface structures, so that a metal net of the top plate can be prevented from being scratched in the frame moving process, and broken rock blocks can be prevented from falling into a triangular area; the base is designed to be of an integral structure, the front end and the rear end of the base are designed to be of circular arc structures, the base is beneficial to moving the support quickly, and the base can adapt to uneven fluctuation of a bottom plate of a supporting area.
The telescopic beams are of a square frame type structure, an upper group of telescopic sleeves and a lower group of telescopic sleeves are mutually nested, telescopic rods of the upper group of telescopic beams are connected with the top beam through the cross-shaped connector, the swinging of the top beam at a certain angle in the front-back direction and the left-right direction can be realized, and the adaptability of the support to a top plate in a triangular area is improved; the lower group of telescopic sleeves is rigidly connected with the base, so that the transverse deformation resistance and the overall stability of the support are improved; the stand be single flexible, 4 stands of single buttress formula support configuration, the support is whole to be strutted intensity height, can effectively bear the weight of regional concentrated stress of triangle, realizes high-efficient supporting.
The concave two-column shield type support is composed of a top beam, a shield beam, a front connecting rod, a rear connecting rod, a telescopic beam jack, a stand column, a base and a push beam, the whole structure of the support is stable, and the concave two-column shield type support and a four-column support type support are connected with each other through a push-pull jack to form a temporary support group, so that temporary support of a triangular area of a withdrawing working face is realized.
The top beam of the concave two-column shield type support is designed to be of a concave structure, the middle area of the front part of the top beam is provided with a telescopic beam, the edge of the front part of the top beam is designed to be of a large-radius spherical structure, so that the damage to a metal mesh in a triangular area in the supporting process is avoided, a waste rock blocking plate is designed on one side, close to a goaf, of the edge of the top beam, the waste rock blocking plate is designed to be of an integral structure, and the damage to the support caused by the fact that a large piece of waste rock falls into the triangular area in the supporting process can be avoided; the stand design be two extending structure, support high wide range, have good adaptability to triangle district support space.
The concave two-column shield type support telescopic beam jack and the pushing beam form a support pushing top beam, when the support type hydraulic support is pushed forwards in the actual supporting process, the telescopic jack is timely extended to push the top beam forwards, the empty area is timely supported, and the safety of the broken top plate is maintained.
The push beam and the top beam of the concave two-column shield type support are designed into a nested structure, when the telescopic beam jack is in a contracted state, the push beam is nested in the top beam, and when the telescopic beam jack is in a telescopic state, the push beam is in a telescopic state.
Based on the broken roof in the withdrawing working face triangular space, the change of actual height is great, and the height of supporting two support devices around the withdrawing triangular space of broken roof comprehensive mining face can be adjusted according to actual conditions, and the high scope of supporting of adaptation withdrawing working face triangular space that can be fine has increased the whole adaptability of support group.
The supporting method of the supporting device mainly comprises the following steps:
after the mining of the fully mechanized mining face is finished, devices such as a belt to be crosscut, a device train, a pipe cable, a reversed loader, a crusher, a forepoling, a face coal mining machine, a scraper conveyor and the like are withdrawn, and then the hydraulic supports of the fully mechanized mining face begin to be withdrawn, according to the arrangement condition of the withdrawal channel connection lane, the two adjacent hydraulic supports are drawn out to the withdrawal channel through a winch from the position of the connection lane close to the middle area of the face, and the supports are respectively carried to the ground or the next face by two support carrying vehicles; after two adjacent hydraulic supports are pulled out, two concave column shielding type supports at the rear parts of the two triangular area support groups are respectively arranged in the supporting space after the two adjacent supports are withdrawn, the two column shielding type supports are arranged in parallel with the fully mechanized mining surface hydraulic supports, and primary temporary supporting is completed.
And after the first group of two adjacent hydraulic supports are withdrawn, mining is withdrawn from the middle part to the edge, the two hydraulic supports beside the two-column shielding type supports at the rear part of the temporary support group are respectively pulled out through a winch, and are withdrawn, after the second group of supports are pulled out, the two adjacent parallel shielding type supports are respectively deflected to the end area of the working face by 25-30 degrees according to the size of the reserved space, so that the two shielding type supports respectively perform inclined temporary support on the withdrawn space of the original four adjacent comprehensive mining face supports, and the temporary support after the second group of supports are withdrawn is completed.
And then, withdrawing a third group of fully-mechanized mining hydraulic supports, pulling and moving the hydraulic supports of the temporary support area edge close to the end direction of the working face to a withdrawal channel and then carrying, pulling and moving the third group of supports to the withdrawal channel and then respectively connecting the two parallel four-column supporting type supports of the front support of the triangular area support group with the two rear-column shielding type supports, integrating the support group according to an allowed space and rotating for 45-60 degrees, so that the single group of temporary support group respectively carries out inclined full-coverage support on the space within the width range of the original three adjacent fully-mechanized mining supports, and the temporary support after the third group of supports are withdrawn is completed.
And further, withdrawing a fourth group of two fully-mechanized mining supports towards the end of the working face, after the fourth group of fully-mechanized mining supports are pulled and moved to a withdrawal channel, respectively adjusting the support direction of the triangular area support group to enable the two groups of support groups to be parallel, and enabling the direction of the top beam of the temporary support group to be consistent with the trend direction of the withdrawal channel and to be perpendicular to the direction of the top beam of the fully-mechanized mining support to be withdrawn.
Furthermore, the fully-mechanized mining hydraulic supports move from the middle area to the two end parts of the working face respectively, two of the four triangular area support groups are arranged in parallel and move from the middle area to the two ends in sequence along with the retraction of the fully-mechanized mining supports, and the triangular areas are quickly and temporarily supported. During temporary support, four groups of triangular area support groups respectively carry out temporary support on triangular areas on two sides, move the supports in opposite directions, and complete the temporary support operation of the triangular areas until all the hydraulic supports on the working face are withdrawn.
Claims (7)
1. The utility model provides a broken roof is synthesized and is adopted face hydraulic support withdrawal triangular space temporary support device which characterized in that: the hydraulic support comprises two sets of embedded four-column support type hydraulic supports which are pushed and pulled mutually and arranged in parallel in a triangular area of a retraction working face and a concave two-column shield type hydraulic support of an outer sleeve, and the embedded four-column support type hydraulic supports and the concave two-column shield type hydraulic supports are connected in a front-back nested mode through a pushing oil cylinder;
the concave two-column shield type hydraulic support comprises a top beam II with a concave cross section, a shield beam, a front connecting rod, a rear connecting rod, a telescopic jack, a stand column II, a base II and a pushing beam, wherein one end of the top beam II is connected with one end of the telescopic jack, the other end of the top beam II is connected with one end of the shield beam, the other end of the shield beam is connected with one end of the rear connecting rod, the other end of the rear connecting rod is connected with the base II, the bottom of the shield beam and the base II are connected through the front connecting rod, one end of the stand column II is connected with the bottom of the top beam II, the other end of the stand column II is connected with the base II, the pushing beam is nested in the top beam II, and the other end of the telescopic jack is connected with a top beam I of the embedded four-column support type support.
2. The temporary supporting device for the withdrawing triangular space of the hydraulic support of the broken roof fully mechanized mining surface according to claim 1, wherein: embedded four post support formula hydraulic support includes back timber I, telescopic sleeve, stand I and base I, the quantity of stand I is four, and the both ends of stand I are connected with back timber I and base I respectively, and telescopic one end is passed through the cross connector and is connected with back timber I, and the other end is connected with base I, and four stands I are located four apex angles of back timber I respectively, and the sleeve is located the center of four stands I.
3. The temporary supporting device for the withdrawing triangular space of the hydraulic support of the broken roof fully mechanized mining surface according to claim 2, wherein: the front end and the rear end of the top beam I are spherical end faces respectively.
4. The temporary supporting device for the withdrawing triangular space of the hydraulic support of the broken roof fully mechanized mining surface according to claim 3, wherein: the front end and the rear end of the base I are of circular arc structures respectively.
5. The temporary supporting device for the withdrawing triangular space of the hydraulic support of the broken roof fully mechanized mining surface according to claim 4, wherein: the front end of the top beam II is of a spherical structure.
6. The temporary supporting device for the withdrawing triangular space of the hydraulic support of the broken roof fully mechanized mining surface according to claim 5, wherein: and a gangue blocking plate is arranged on one side, close to the goaf, of the edge of the top beam II.
7. The temporary supporting device for the withdrawing triangular space of the hydraulic support of the broken roof fully mechanized mining surface according to claim 6, wherein: and the stand column II is of a double-telescopic structure.
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| CN202111107497.3A CN113653524A (en) | 2021-09-22 | 2021-09-22 | Broken roof is synthesized and is adopted face hydraulic support withdrawal triangular space temporary support device |
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| CN202111107497.3A CN113653524A (en) | 2021-09-22 | 2021-09-22 | Broken roof is synthesized and is adopted face hydraulic support withdrawal triangular space temporary support device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114263483A (en) * | 2021-12-27 | 2022-04-01 | 国家能源集团宁夏煤业有限责任公司 | Processing method for caving space in fully mechanized coal mining face propelling process |
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| CN114263483B (en) * | 2021-12-27 | 2024-01-30 | 国家能源集团宁夏煤业有限责任公司 | Method for processing caving space in fully mechanized coal mining face advancing process |
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