CN216305982U

CN216305982U - Beam-free end distance high-strength side-protecting hydraulic support

Info

Publication number: CN216305982U
Application number: CN202122739328.3U
Authority: CN
Inventors: 崔贝贝; 赵光明; 樊华; 李进义; 徐佳佳; 任传强; 李伟强
Original assignee: Jinding Shanxi Coal Machinery Co Ltd Of Jinneng Holding Equipment Manufacturing Group
Current assignee: Jinding Shanxi Coal Machinery Co Ltd Of Jinneng Holding Equipment Manufacturing Group
Priority date: 2021-11-10
Filing date: 2021-11-10
Publication date: 2022-04-15
Anticipated expiration: 2031-11-10

Abstract

The utility model relates to a high-strength side-protecting hydraulic support without a beam end distance, and belongs to the technical field of coal mine production. The telescopic beam is extended, an upper cover plate of a slideway is arranged in the slideway, an inclined support jack connected with a protection side is arranged at the lower part of a top beam, and a small-flow pump and a bypass booster valve are arranged at a liquid inlet of an upright post jack and a liquid inlet of the protection side jack to form an independent second set of hydraulic system. The upper cover plate of the slideway avoids the coal accumulation problem of the telescopic beam; the telescopic beam is prolonged, and the empty-roof distance is effectively shortened; the inclined strut jack greatly enhances the horizontal supporting force of the protective wall; the double hydraulic systems greatly improve the initial supporting force of the upright column jack and the side protection jack. The utility model has greatly optimized various performances, thoroughly solves the problems of wall caving and roof caving of the large mining height working face under the action of the telescopic beam, the inclined strut jack and the double hydraulic systems, and is worthy of popularization and application.

Description

Beam-free end distance high-strength side-protecting hydraulic support

Technical Field

The utility model belongs to the technical field of coal mine production, and particularly relates to a large-mining-height hydraulic support for a fully mechanized coal mining face in a coal mine, in particular to a high-strength side-protecting hydraulic support without a beam end distance.

Background

For a coal mine underground fully mechanized mining face, in the mining process, when the lithology of a top plate is mainly mudstone and sandy mudstone, advanced fracture often occurs, and the events of wall caving and roof caving of the face are caused. Especially for a large mining height working face, due to the large mining height and the large height adjusting range of the support, the speed of pulling the support after the coal cutter cuts coal is slow, so that the support is difficult to support in real time, and the conditions of rib caving and roof caving are more obvious.

According to research, most of the mines in China currently use a one-time mining full-height coal mining process, and series of shield type large-mining-height hydraulic supports of 6.2 meters, 7.2 meters and the like are widely used on fully mechanized coal mining working faces. The series of hydraulic supports have a relatively perfect telescopic side protection mechanism, and although the series of hydraulic supports can generate good sealing performance, the series of hydraulic supports still have the following problems:

firstly, the telescopic beam of the hydraulic support has short telescopic amount and insufficient support distance, and after a coal cutter cuts coal, the support cannot be effectively supported in time, so that the empty roof distance is too large, and the roof caving risk exists;

secondly, when the roof fall occurs, the support telescopic side protection mechanism is timely driven out, but due to the limitation of spatial position and structural form, the upward supporting angle of the side protection jack is very small, the upward supporting force is insufficient, and the supporting requirement cannot be met;

thirdly, the support has insufficient active supporting force on the top plate, so that the coal side is stressed greatly and the phenomenon of rib caving occurs;

and fourthly, when the rib spalling phenomenon occurs, the protective rib breaks out the supporting coal wall, but the horizontal axial supporting force is not enough, so that the supporting requirement cannot be met.

Aiming at the problems existing in the existing shield type large mining height hydraulic support, along with the great improvement of technologies such as support design, high-strength plate welding, large-diameter hydraulic cylinder manufacturing, sealing manufacturing, high-strength plate manufacturing and the like at home and abroad and the national requirements on the safety and high efficiency of coal mine production, the research and development of a novel hydraulic support capable of effectively reducing or avoiding rib spalling and roof collapse accidents are urgent.

Disclosure of Invention

The utility model aims to solve the problems in the prior art and provide a high-strength side-protecting hydraulic support without a beam end distance.

The utility model is realized by the following technical scheme:

a kind of non-beam end distance high-strength side wall-protecting hydraulic support, including the body of the shield type high mining hydraulic support, the body of the shield type high mining hydraulic support includes the base, roof beam and pillar jack connected between the two; one side of the top beam is provided with a fixed side guard plate, and the other side is provided with a movable side guard plate; a slideway is arranged in the top beam, a telescopic beam is slidably arranged in the slideway, and the front end of the telescopic beam is hinged with the bottom surface of the top beam through two telescopic jacks; the front end of the telescopic beam is provided with a first-stage protective wall and a second-stage protective wall, and a protective wall jack is connected between the first-stage protective wall and the second-stage protective wall; the vertical rib plate positioned at the tail end of the slideway in the top beam is moved backwards, the front end of the top beam is extended forwards, the distance of the slideway is increased, and the length of the telescopic beam is correspondingly extended; a slideway upper cover plate is arranged in the slideway and is positioned above the telescopic beam; a middle slideway lower cover plate is arranged at the position, located at the tail end of the slideway, on the bottom surface of the top beam, side slideway lower cover plates are respectively arranged on two sides of the middle slideway lower cover plate, hinged lug plates are arranged on the side slideway lower cover plates, and the end part of a cylinder body of the telescopic jack is hinged with the hinged lug plates; the bottom of the top beam is provided with an inclined strut jack along the central line position thereof, the inclined strut jack is positioned below the telescopic jack, the end part of a cylinder body of the inclined strut jack is hinged with the bottom surface of the top beam, and the end part of a piston rod of the inclined strut jack is hinged with a movable supporting head; a rotary jack is arranged at the position behind the diagonal brace jack, the rotary jack and the diagonal brace jack are positioned on the same straight line, the end part of a cylinder body of the rotary jack is hinged with the bottom surface of the top beam, and the end part of a piston rod of the rotary jack is hinged with the outer wall of the cylinder body of the diagonal brace jack; the liquid inlet of the upright post jack and the liquid inlet of the side protection jack are both provided with a flow pump and a bypass booster valve.

Further, the length of the front end of the top beam extending forwards is 690mm, the distance of the slide ways is increased by 980mm, and the length of the telescopic beam extending forwards is 325 mm.

Furthermore, the fixed side guard plate and the movable side guard plate are provided with upper and lower coal cleaning ports.

Furthermore, coal discharging holes are formed in the dead angle position and the tail end plate edge position of the side edge slide way lower cover plate, and the size of the coal discharging hole in the tail end plate edge position is larger than that of the coal discharging hole in the dead angle position.

The hydraulic support has the advantages of scientific design, ingenious structure, easy implementation, simple maintenance and good use effect, and the top beam slideway of the hydraulic support is internally provided with the slideway upper cover plate, so that the coal accumulation problem of the telescopic beam is avoided; the telescopic beam is prolonged, the telescopic capacity is large, and the empty-roof distance is effectively shortened; the inclined strut jack is additionally arranged, so that the horizontal supporting force of the protective wall is greatly enhanced; the double hydraulic systems are adopted, so that the initial supporting force of the upright column jack and the side protection jack is greatly improved; in a word, all the performances of the hydraulic support are greatly optimized, the problems of wall caving and roof caving of a large-mining-height working face are thoroughly solved under the action of the telescopic beam, the inclined strut jack and the double hydraulic systems, and the hydraulic support is worthy of popularization and application.

The hydraulic support has the advantages of scientific design, ingenious structure, easy implementation, simple maintenance and good use effect, and the top beam slideway of the hydraulic support is internally provided with the slideway upper cover plate, so that the coal accumulation problem of the telescopic beam is avoided; the telescopic beam is prolonged on the premise of ensuring the supporting strength, the extending amount is increased, and the empty top distance is effectively shortened; the inclined strut mechanism mainly comprising an inclined strut jack and a rotary jack is additionally arranged, so that the horizontal supporting force of the protective wall is greatly enhanced; the double hydraulic systems are adopted, so that the initial supporting force of the upright column jack and the side protection jack is greatly improved; in a word, all the performances of the hydraulic support are greatly optimized, the problems of wall caving and roof caving of a large-mining-height working face are thoroughly solved under the action of the telescopic beam, the inclined strut jack and the double hydraulic systems, and the hydraulic support is worthy of popularization and application.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate exemplary embodiments of the utility model and, together with the description, serve to explain the utility model and not to limit the utility model.

FIG. 1 is a schematic structural diagram of the present invention.

FIG. 2 is a schematic diagram of a fixed side guard plate structure according to the present invention.

FIG. 3 is a schematic diagram of the movable side guard plate structure of the present invention.

FIG. 4 is a schematic view of the structure of the middle slipway lower cover plate and the side slipway lower cover plate on the bottom surface of the top beam of the present invention.

In the figure: 1-base, 2-top beam, 3-upright column jack, 4-fixed side guard plate, 5-movable side guard plate, 6-slideway, 7-telescopic beam, 8-first-stage side guard, 9-vertical rib plate, 10-slideway upper cover plate, 11-coal cleaning port, 12-middle slideway lower cover plate, 13-side slideway lower cover plate, 14-coal placing hole, 15-diagonal bracing jack, 16-movable supporting head, 17-rotary jack and 18-second-stage side guard.

Detailed Description

In order that those skilled in the art will better understand the present invention, a more complete and complete description of the present invention is provided below in conjunction with the accompanying drawings and embodiments. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.

As shown in fig. 1 to 4, a high-strength highwall hydraulic support without a beam end distance comprises a shield type high mining height hydraulic support body, wherein the shield type high mining height hydraulic support body comprises a base 1, a top beam 2 and an upright post jack 3 connected between the base and the top beam; one side of the top beam 2 is provided with a fixed side guard plate 4, and the other side is provided with a movable side guard plate 5; a slideway 6 is arranged in the top beam 2, a telescopic beam 7 is slidably arranged in the slideway 6, and the front end of the telescopic beam 7 is hinged with the bottom surface of the top beam 2 through two telescopic jacks; the front end of the telescopic beam 7 is provided with a first-stage protective side 8 and a second-stage protective side 18, and a protective side jack is connected between the first-stage protective side 8 and the second-stage protective side 18.

The vertical rib plate 9 positioned at the tail end of the slideway 6 in the top beam 2 is moved backwards, the front end of the top beam 2 is extended forwards, the distance of the slideway 6 is increased, and the length of the telescopic beam 7 is correspondingly extended, wherein the length of the forward extension of the front end of the top beam 2 is 690mm, the distance of the slideway 6 is increased by 980mm, and the length of the extension of the telescopic beam 7 is 325 mm; a slideway upper cover plate 10 is arranged in the slideway 6, and the slideway upper cover plate 10 is positioned above the telescopic beam 7; the fixed side guard plate 4 and the movable side guard plate 5 are both provided with an upper coal cleaning port and a lower coal cleaning port 11; a middle slideway lower cover plate 12 is arranged at the position, located at the tail end of the slideway 6, on the bottom surface of the top beam 2, side slideway lower cover plates 13 are respectively arranged at two sides of the middle slideway lower cover plate 12, hinged lug plates are arranged on the side slideway lower cover plates 13, and the end parts of cylinder bodies of the telescopic jacks are hinged with the hinged lug plates; coal placing holes 14 are formed in the dead corners of the side slideway lower cover plate 13 and the edges of the tail end plate, and the size of the coal placing hole 14 in the edge of the tail end plate is larger than that of the coal placing hole 14 in the dead corner; an inclined support jack 15 is arranged at the bottom of the top beam 2 along the central line of the top beam, the inclined support jack 15 is positioned below the telescopic jack and the side protection jack, the end part of a cylinder body of the inclined support jack 15 is hinged with the bottom surface of the top beam 2, and the end part of a piston rod of the inclined support jack 15 is hinged with a movable support head 16; a rotary jack 17 is arranged at the position behind the inclined strut jack 15, the rotary jack 17 and the inclined strut jack 15 are positioned on the same straight line, the end part of a cylinder body of the rotary jack 17 is hinged with the bottom surface of the top beam 2, and the end part of a piston rod of the rotary jack 17 is hinged with the outer wall of the cylinder body of the inclined strut jack 15; the liquid inlet of the upright post jack 3 and the liquid inlet of the side protection jack are respectively provided with a small flow pump and a bypass booster valve.

The hydraulic support has the characteristics of small beam end distance, strong supporting force of the upright post jack 3 and the side protection jack and the like, and has the following structural characteristics:

1) redesigning a top beam 2 structure, keeping the relative position and the hinge size of structural components such as the top beam 2, a four-bar linkage mechanism, a column jack 3 and the like unchanged, and having no influence on the use of the whole frame and the matching effect of a three-machine, so that the rear part of a column nest of the top beam 2 keeps the original structure unchanged, meanwhile, keeping the stressed supporting area of the top beam 2 unchanged, extending the front end of the top beam 2 forwards, and moving a vertical rib plate 9 positioned at the tail end of a slideway 6 in the top beam 2 backwards, thereby realizing the purpose of lengthening a cavity of the slideway 6, increasing the distance of the slideway 6, prolonging the length of a telescopic beam 7 on the premise of ensuring effective supporting force, ensuring the effective lap joint length of the telescopic beam 7 and the top beam 2, and simultaneously increasing an inclined rib plate to ensure the structural strength, thereby shortening the empty roof distance;

2) in the traditional support with the telescopic beam, dead angles exist in a slideway, coal is easy to accumulate, particularly in a wet underground environment, coal slime is difficult to fall off, and the phenomena of clamping and recovery failure of the telescopic beam often occur, so that an upper cover plate 10 of the slideway is added at a position above the telescopic beam 7 in the slideway 6 of the top beam 2, the coal accumulation dead angles in the slideway 6 are thoroughly eliminated, and meanwhile, the bending resistance and the torsional strength of the top beam 2 are also increased by the cover plate structure;

3) the bottom surface of the top beam 2 is provided with a middle slideway lower cover plate 12 and a side slideway lower cover plate 13 at the tail end of the slideway 6, and the middle slideway lower cover plate and the side slideway lower cover plate form a double-layer plate structure with a bottom plate of the slideway 6, so that the sectional area of a cavity at the front end of the top beam 2 is increased, the problem of insufficient support strength caused by the arrangement and increase of a coal discharge port can be solved, the bending resistance and the tensile strength of the structure are increased by nearly 5 percent compared with the traditional structure, and the support strength of a new top beam 2 is effectively ensured;

4) after the upper cover plate 10 of the slideway is additionally arranged, the original coal accumulation groove does not exist, but a very small amount of coal slime still remains at the dead angle of the slideway 6 due to the large extrusion force of the telescopic beam 7, so that the upper coal cleaning port and the lower coal cleaning port 11 are respectively arranged on the fixed side guard plate 4 and the movable side guard plate 5, the slideway 6 is always cleaned by periodically performing auxiliary cleaning and matching with a coal placing hole, the movement smoothness of the telescopic beam 7 is further ensured, the empty roof distance is timely eliminated, and the rib caving and roof caving accidents are prevented;

5) in order to further improve the supporting force of the protective side 8, system external force is introduced, detachable auxiliary mechanical design is carried out, specifically, an inclined strut jack 15 and a matching device thereof are additionally arranged, and the horizontal supporting force of the protective side 8 is greatly enhanced due to the addition of the inclined strut jack 15 and the matching device thereof; the end part of a piston rod of the inclined strut jack 15 is not directly hinged with the protective wall 8, but is in contact with the protective wall 8 through a movable support head 16, can be supported to any position on the protective wall 8, and cannot influence the normal use of the protective wall 8, the inclined strut jack 15 is utilized for auxiliary support under poor coal wall conditions or special conditions, when the coal wall conditions are not good and do not need to be used under normal coal mining conditions, the inclined strut jack 15 can be automatically retracted, and when the inclined strut jack 15 is retracted, the reserved space position does not influence the normal mining of a coal mining machine and the normal passing of pedestrians; the inclined strut jack 15 and the matched device thereof are hinged at the anti-falling cylinder position of the top beam 2, can be detached and replaced at will, meet the requirement of condition separation, the matched device comprises a rotary jack 17, and all actions are automatically completed by a hydraulic system; the inclined strut jack 15 is designed into a double-telescopic structure, and interference phenomenon of the bracket is avoided when the bracket is lowered to a position of 3.3m by reducing the turning radius of the inclined strut jack; through calculation, the inclined strut jack 15 and the matched device thereof can provide horizontal supporting force for the coal wall at least about 1000KN, and can effectively reduce or avoid the occurrence of the rib caving phenomenon;

4) for the problems of caving and roof caving of the underground coal mine, one of the important factors is that the active supporting force of the hydraulic support to the top plate is insufficient, namely the initial supporting force is insufficient, and the system pressure needs to be increased to increase the initial supporting force of the upright jack 3 and the initial supporting force of the protecting jack, on the basis of the above, the pressure limit and the corresponding safety coefficient of each hydraulic part are verified by combining the traditional large mining height support hydraulic system and the production practice, the utility model adopts a double hydraulic system, namely a small flow pump and a bypass booster valve are respectively arranged at a liquid inlet of the upright jack 3 and a liquid inlet of the protecting jack, the whole rated pressure of the system is not changed and the local pressure is improved by locally boosting the upright jack 3 and the protecting jack, the active supporting force of the support to the top plate can be effectively improved by the design, namely the initial supporting force of the upright jack 3 and the protecting jack is enhanced, the purposes of reducing the pressure of the coal side and reducing the caving phenomenon of the rib caving are achieved.

The technical solutions in the embodiments of the present invention are clearly and completely described above, and the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Claims

1. A kind of non-beam end distance high-strength side wall-protecting hydraulic support, including the body of the shield type high mining hydraulic support, the body of the shield type high mining hydraulic support includes the base, roof beam and pillar jack connected between the two; one side of the top beam is provided with a fixed side guard plate, and the other side is provided with a movable side guard plate; a slideway is arranged in the top beam, a telescopic beam is slidably arranged in the slideway, and the front end of the telescopic beam is hinged with the bottom surface of the top beam through two telescopic jacks; the front end of the telescopic beam is provided with a first-stage protective wall and a second-stage protective wall, and a protective wall jack is connected between the first-stage protective wall and the second-stage protective wall; the method is characterized in that: the vertical rib plate positioned at the tail end of the slideway in the top beam is moved backwards, the front end of the top beam is extended forwards, the distance of the slideway is increased, and the length of the telescopic beam is correspondingly extended; a slideway upper cover plate is arranged in the slideway and is positioned above the telescopic beam; a middle slideway lower cover plate is arranged at the position, located at the tail end of the slideway, on the bottom surface of the top beam, side slideway lower cover plates are respectively arranged on two sides of the middle slideway lower cover plate, hinged lug plates are arranged on the side slideway lower cover plates, and the end part of a cylinder body of the telescopic jack is hinged with the hinged lug plates; the bottom of the top beam is provided with an inclined strut jack along the central line position thereof, the inclined strut jack is positioned below the telescopic jack, the end part of a cylinder body of the inclined strut jack is hinged with the bottom surface of the top beam, and the end part of a piston rod of the inclined strut jack is hinged with a movable supporting head; a rotary jack is arranged at the position behind the diagonal brace jack, the rotary jack and the diagonal brace jack are positioned on the same straight line, the end part of a cylinder body of the rotary jack is hinged with the bottom surface of the top beam, and the end part of a piston rod of the rotary jack is hinged with the outer wall of the cylinder body of the diagonal brace jack; the liquid inlet of the upright post jack and the liquid inlet of the side protection jack are respectively provided with a small flow pump and a bypass booster valve.

2. The beamless end distance high-strength side-protecting hydraulic support according to claim 1, characterized in that: the length of the front end of the top beam extending forwards is 690mm, the distance of the slide ways is increased by 980mm, and the length of the extension beam is 325 mm.

3. The beamless end distance high-strength side wall hydraulic support according to claim 1 or 2, characterized in that: the fixed side guard plate and the movable side guard plate are provided with upper and lower coal cleaning ports.

4. The beamless end distance high-strength side wall hydraulic support according to claim 1 or 2, characterized in that: coal discharging holes are formed in the dead angle position of the side edge slideway lower cover plate and the tail end plate edge position, and the size of the coal discharging hole in the tail end plate edge position is larger than that of the coal discharging hole in the dead angle position.