An integrated hydraulic support for longwall top coal caving and paste backfilling

Abstract

This invention proposes an integrated hydraulic support for longwall top coal caving and paste backfilling. A rear top beam is located behind the front top beam, and a backfilling arm is located at the rear of the rear top beam. A backfilling arm jack, which drives the backfilling arm to swing up and down, is located on the lower side of the backfilling arm. A backfilling pipeline is installed inside the backfilling arm, extending forward and bending downwards at the front of the rear top beam. A material distribution valve is located at the opening of the front end of the backfilling pipeline. The adjustment device is a fixing and pushing device for the material distribution valve, installed below the front top beam. The protective beam is a folded plate beam, and a protective beam jack is located on the lower side of the protective beam. Its beneficial effects are: this invention can work in conjunction with ordinary top coal caving supports to fully utilize their advantages of efficient coal caving, and can also efficiently backfill the rear collapse zone with paste to prevent ground subsidence. Furthermore, it can consume a large amount of gangue, solving the environmental pollution caused by surface gangue pile accumulation and addressing the problem of newly generated gangue discharge during underground coal mining.

Description

Technical Field

[0001] This invention relates to the field of coal mining, and in particular to an integrated hydraulic support for longwall top coal caving and paste filling. Background Technology

[0002] Coal mining often faces a series of challenges, including environmental pollution from surface gangue piles, the large land occupation of surface coal preparation plants, coal pressure from underground materials, and hard roofs in some fully mechanized longwall faces, which accumulate significant energy and are prone to impact during roof exposure and fracture. These problems are often addressed by filling the goaf with paste (or high-water content) or coal gangue. However, existing fully mechanized longwall hydraulic supports are limited in function, only capable of coal release and not post-support filling, or their effectiveness in both is poor. Achieving efficient coal release, consuming large amounts of gangue, and having a simple and convenient filling system is a major challenge in fully mechanized longwall face mining and filling. Therefore, developing a mature fully mechanized longwall hydraulic support that can both facilitate efficient coal release and perform both coal release and filling is crucial to overcoming this technical challenge. Summary of the Invention

[0003] To address the problem in existing technologies where fully mechanized longwall mining faces can only release coal but not fill it, or where the coal release and filling effects are relatively poor, this invention provides an integrated hydraulic support for fully mechanized longwall top coal caving and paste filling that can work in conjunction with mature fully mechanized longwall hydraulic supports to fully utilize efficient coal release and efficient filling.

[0004] The technical solution of this invention is implemented as follows:

[0005] An integrated hydraulic support for longwall top coal caving and paste backfilling includes: a base, a front top beam, a rear top beam, a front column, a rear column, and a four-bar linkage. The front of the base is equipped with a pushing mechanism and a control valve assembly. The front top beam is supported by the front column and the four-bar linkage mounted on the base. The front end of the front top beam is a telescopic beam with a telescopic jack. A side plate with a side-protecting jack is provided on the front side of the telescopic beam. A balancing jack is also provided on the upper part of the four-bar linkage, with the other end of the balancing jack hinged to the lower side of the front top beam. The rear top beam is located behind the front top beam, and the rear column is located on the lower side of the rear top beam. The lower part of the rear column is mounted on the base. A filling arm is provided at the rear of the top beam. A filling arm jack is provided on the lower side of the filling arm to drive the filling arm to swing up and down. The rear part of the filling arm jack is installed on the rear top beam. A filling pipeline is arranged inside the filling arm. The filling pipeline extends forward and bends downward at the front part of the rear top beam. A material distribution valve is provided at the front opening of the filling pipeline. The material distribution valve is also connected to an adjustment device. The adjustment device is a device for fixing and pushing the material distribution valve. The adjustment device is installed below the front top beam. A protective beam is hinged to the base. The protective beam is a folded plate beam. A protective beam jack is provided on the lower side of the protective beam. The rear end of the protective beam jack is hinged to the base. The protective beam is located above the scraper conveyor.

[0006] Furthermore, the filling arm has a ridge-type structure with downward slopes on both sides, and the filling pipeline located below the rear top beam is a telescopic pipeline.

[0007] Furthermore, the protective beam has a flat-top roof ridge structure, with its front section serving as a filling work platform and its rear section tilting downwards.

[0008] Furthermore, the rear section of the protective beam is flush with the tail beam insert plate of the top coal support on both sides to form a closed isolation space, which assists in completing the coal release and filling.

[0009] The beneficial effects of this invention are: it can be used in conjunction with ordinary top coal caving supports to give full play to the advantages of efficient coal caving, and it can also efficiently fill the rear collapse zone with paste to prevent ground subsidence. In addition, it can consume a large amount of gangue. The paste filling material is mainly a mixture of crushed gangue powder, additives and water, which solves the environmental pollution caused by the accumulation of gangue on the ground and solves the problem of newly generated gangue discharge in underground coal mining. Attached Figure Description

[0010] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0011] Figure 1 This is a schematic diagram of the structure of the present invention;

[0012] Figure 2 This is a schematic diagram of the present invention in the coal mining state;

[0013] Figure 3 This is a schematic diagram of the present invention in the coal discharge state;

[0014] Figure 4 This is a schematic diagram of the present invention in the filling state;

[0015] Figure 5 This is a diagram showing the coal discharge state of the present invention in conjunction with a conventional support;

[0016] Figure 6 This is a diagram showing the filling state of the present invention in conjunction with a conventional stent. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] like Figures 1-6The diagram shows an integrated hydraulic support for longwall top coal caving and paste backfilling, comprising: a base 1, a front top beam 2, a rear top beam 3, a front column 4, a rear column 5, and a four-bar linkage 6. The front of the base 1 is equipped with a pushing mechanism 7 and a control valve group 8. The pushing mechanism 7 is mainly used to push the front scraper conveyor, and then pull the support forward using the scraper conveyor as a fulcrum. The front top beam 2 is supported by the front column 4 and the four-bar linkage 6 mounted on the base 1. The front end of the front top beam 2 is a telescopic beam 20 with a telescopic beam jack 9. A side-support jack 1 is provided on the front side of the telescopic beam 20. The support plate 11 of the 0 has a balance jack 12 on the upper part of the four-bar linkage 6. The other end of the balance jack 12 is hinged to the lower side of the front top beam 2. The rear top beam 3 is provided behind the front top beam 2. The rear column 5 is provided on the lower side of the rear top beam 3. The lower part of the rear column 5 is installed on the base 1. The hydraulic support adopts a four-column support structure and is equipped with a front top beam 2 and a rear top beam 3. The rear top beam 3 can extend into the goaf area to provide expansion space for filling operations. The filling arm 13 at the rear of the rear top beam 3 can guide the top coal on it through the inclined surfaces on both sides into the rear scraper conveyor.

[0019] A filling arm 13 is provided at the rear of the rear top beam 3. A filling arm jack 14 is provided on the lower side of the filling arm 13 to drive the filling arm 13 to swing up and down. The rear of the filling arm jack 14 is installed on the rear top beam 3. A filling pipe 15 is provided inside the filling arm 13. The filling pipe 15 extends forward and bends downward at the front of the rear top beam 3. A material distribution valve 16 is provided at the front opening of the filling pipe 15. The material distribution valve 16 is also connected to an adjustment device 17. The adjustment device 17 is a device for fixing and pushing the material distribution valve 16. The adjustment device 17 is installed below the front top beam 2.

[0020] A filling pipe 15 is arranged inside the filling arm 13. The paste is transported to the rear of the filling arm 13 through this filling pipe 15 for filling. The filling pipe 15 is divided into two sections. The filling pipe 15 below the rear top beam 3 can extend and retract to a certain length. The filling pipe 15 inside the rear top beam 3 is connected to the material distribution valve 16. The material distribution valve 16 is installed on the adjustment device 17. The adjustment device 17 is located below the front top beam 2 and can move back and forth a certain distance to accommodate the movement of adjacent supports. The filling pipe 15 on the adjacent support is connected to the material distribution valve 16 on this support. Since it is a rigid connection, when the adjacent support moves, the material distribution valve 16 of this support moves a certain distance on the adjustment device 17.

[0021] The protective beam 18 and the protective beam jack 19 are installed on the base. The protective beam 18 can swing up and down at a certain angle under the action of the protective beam jack 19. The upper part of the protective beam 18 is a flat roof ridge structure, which can guide the coal on the upper part to the sides through the inclined surfaces on both sides, and then fall onto the rear scraper conveyor 20. In the filling state, the tail beam of the adjacent ordinary top coal caving support overlaps and closes with the protective beam 18 to prevent the filling paste from entering the scraper conveyor 20.

[0022] In practical work, in the top coal caving face, a fully mechanized hydraulic support integrating caving and filling is arranged every 3 to 5 ordinary top coal caving supports. This invention can not only cooperate with ordinary top coal caving supports to give full play to their advantages of efficient coal caving, but also efficiently fill the rear collapse area with paste to prevent ground subsidence, and consume a large amount of gangue. The paste filling material is mainly a mixture of crushed gangue powder, additives and water, which solves the environmental pollution caused by the accumulation of gangue on the ground and solves the problem of newly generated gangue discharge in underground coal mining.

[0023] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An integrated hydraulic support for longwall top coal caving and paste backfilling, comprising: The system comprises a base, a front top beam, a rear top beam, a front column, a rear column, and a four-bar linkage. The base has a pushing mechanism and a control valve assembly at its front. The front top beam is supported by the front column mounted on the base and the four-bar linkage. The front end of the front top beam is a telescopic beam with a telescopic jack. A side plate with a side jack is provided on the front side of the telescopic beam. A balancing jack is also provided on the upper part of the four-bar linkage, with the other end of the balancing jack hinged to the lower side of the front top beam. The rear top beam is located behind the front top beam, and the rear column is located on the lower side of the rear top beam. The lower part of the rear column is mounted on the base. A four-bar linkage is located at the rear of the rear top beam. A filling arm is provided with a filling arm jack on its lower side, which drives the filling arm to swing up and down. The rear part of the filling arm jack is mounted on the rear top beam. A filling pipeline is arranged inside the filling arm. The filling pipeline extends forward and bends downward at the front part of the rear top beam. A material distribution valve is provided at the front opening of the filling pipeline. The material distribution valve is also connected to an adjustment device. The adjustment device is a device for fixing and pushing the material distribution valve. The adjustment device is installed below the front top beam. A protective beam is hinged to the base and is located above the scraper conveyor. The protective beam is a folded plate beam. A protective beam jack is provided on the lower side of the protective beam. The rear end of the protective beam jack is hinged to the base. The filling arm has a ridge-type structure with downward slopes on both sides, and the filling pipeline located below the rear top beam is a telescopic pipeline. The protective beam has a flat-roofed ridge structure, with its front section serving as a filling platform and its rear section sloping downwards. The rear section of the protective beam is flush with the tail beam insert plate of the top coal support on both sides to form a closed isolation space, which assists in the coal release and backfilling.

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