Top coal caving hydraulic support for soft coal seam

Abstract

The utility model discloses a top coal caving hydraulic support for a soft coal seam, and relates to the technical field of hydraulic supports. The top coal caving hydraulic support for the soft coal seam comprises a hydraulic support structure, the bottom end of the hydraulic support structure is movably connected with a movable base, and an adjusting type traction device is fixedly installed at the top end of the movable base; according to the top coal caving hydraulic support for the soft coal seam, by arranging an adjusting type traction device, a U-shaped plate can be driven by an extension rod to vertically slide on the outer side of a driving box, the U-shaped plate is promoted to drive a traction head to conduct height adjustment, and then height locking can be conducted on the extension rod through a gear ring in cooperation with distance adjustment of a movable rack and a fixed rack; the traction head is positioned after height adjustment, so that the support can be adjusted according to the actual traction height of field traction equipment, normal traction of external traction equipment is guaranteed, and the withdrawing efficiency of the support is improved.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic support technology, specifically a hydraulic support for top coal caving in soft coal seams. Background Technology

[0002] Hydraulic supports for top coal caving are developed based on hydraulic supports for ordinary longwall mining faces. While they share the same basic functions in controlling the immediate roof, maintaining the direct roof, and self-moving and pushing conveyors, they differ in their top coal caving mechanism, support stress, head support, dust suppression, and other aspects. Their main function is to be used inside coal mines to provide auxiliary support and fixation for mining operations. Hydraulic supports are an essential tool in coal mining, and they often need to be withdrawn after use.

[0003] A search revealed that in a patent publication number CN219412635U, a movable double-swing rod top coal caving hydraulic support is proposed that "a traction rod is fixedly connected to the left side of the base, and a traction ring is fixedly connected to the left side of the traction rod, which facilitates the use of traction equipment by the staff to transport the hydraulic support and makes it easy to move".

[0004] However, the above solution still has some shortcomings in actual use. The traction ring in this technical solution is fixed to the side of the base and cannot be adjusted according to the actual traction height of the traction equipment on site, which affects the traction of the external traction equipment and reduces the efficiency of hydraulic support retraction. Utility Model Content

[0005] This utility model provides a hydraulic support for top coal caving in soft coal seams to solve the problems in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a hydraulic support for top coal caving in soft coal seams, comprising a hydraulic support structure, wherein a movable base is movably connected to the bottom end of the hydraulic support structure, and an adjustable traction device is fixedly installed at the top end of the movable base;

[0007] The adjustable traction device includes a drive box, the bottom of which is fixedly connected to the top of the movable base. The drive box is divided into a drive cavity and a follower cavity. A fixed rack is installed inside the drive cavity, and an extension rod and a movable rack are slidably connected thereto. The extension rod is located between the fixed rack and the movable rack. A toothed ring is rotatably connected to the surface of the extension rod, and the toothed ring meshes with the fixed rack and the movable rack respectively.

[0008] A U-shaped plate is fitted on the outside of the drive box. The insertion hole on the inside of the U-shaped plate is fixedly connected to one end of the extension rod that extends to the outside of the drive box. A traction head is fixedly connected to the outside of the U-shaped plate.

[0009] Furthermore, the hydraulic support structure includes a base plate, which is fixedly connected to the top of the movable base. A top beam is hinged to the top of the base plate via a movable frame, and an extension plate is movably connected to the front side of the top beam.

[0010] Furthermore, a hydraulic cylinder is fixedly installed at the top of the base plate, and the movable end of the hydraulic cylinder is hinged to the bottom end of the top beam.

[0011] Furthermore, a sliding rod is installed inside the follower cavity, and a collar is fixedly installed on the inner wall of the U-shaped plate, with the inner ring of the collar slidably connected to the surface of the sliding rod.

[0012] Furthermore, a pull rod is installed at the top of the movable rack, and a through-hole is provided at the top of the drive box, through which the pull rod extends to the top of the drive box.

[0013] Furthermore, a locking rod is hinged to the outer side of the pull rod, and two locking holes are opened at the top of the drive box, with the locking rod matching the locking holes.

[0014] Compared with the prior art, this utility model provides a hydraulic support for top coal caving in soft coal seams, which has the following advantages:

[0015] The hydraulic support for top coal caving in this soft coal seam, by setting up an adjustable traction device, uses an extension rod to drive a U-shaped plate to slide vertically on the outside of the drive box. This causes the U-shaped plate to drive the traction head to adjust its height. In addition, the spacing adjustment of the movable rack and fixed rack can lock the extension rod at the height through the gear ring. This allows the traction head to be positioned after the height adjustment is completed. This enables the support to be adjusted according to the actual traction height of the on-site traction equipment, thereby ensuring the normal traction of the external traction equipment and improving the retraction efficiency of the support. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model;

[0017] Figure 2 This is a schematic diagram of the hydraulic support structure of this utility model;

[0018] Figure 3 This is a schematic diagram of the adjustable traction device of this utility model;

[0019] Figure 4 for Figure 3 Enlarged schematic diagram of the structure at point A in the middle.

[0020] In the diagram: 1. Hydraulic support structure; 101. Base plate; 102. Movable frame; 103. Top beam; 104. Extension plate; 105. Hydraulic cylinder; 2. Movable base; 3. Adjustable traction device; 301. Drive box; 302. Drive cavity; 303. Follower cavity; 304. Fixed rack; 305. Movable rack; 306. Extension rod; 307. Gear ring; 308. U-shaped plate; 309. Traction head; 310. Collar; 311. Slide rod; 312. Pull rod; 313. Through-hole; 314. Locking rod; 315. Locking hole. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] Please see Figure 1-4 This utility model discloses a hydraulic support for top coal caving in soft coal seams, including a hydraulic support structure 1, a movable base 2 movably connected to the bottom end of the hydraulic support structure 1, and an adjustable traction device 3 fixedly installed at the top end of the movable base 2.

[0023] The hydraulic support structure 1 includes a base plate 101, which is fixedly connected to the top of the movable base 2. A top beam 103 is hinged to the top of the base plate 101 via a movable frame 102. An extension plate 104 is movably connected to the front side of the top beam 103. A hydraulic cylinder 105 is fixedly installed on the top of the base plate 101, and the movable end of the hydraulic cylinder 105 is hinged to the bottom end of the top beam 103.

[0024] The adjustable traction device 3 includes a drive box 301, the bottom end of which is fixedly connected to the top end of the movable base 2. The interior of the drive box 301 is divided into a drive cavity 302 and a follower cavity 303. A fixed rack 304 is installed inside the drive cavity 302, and an extension rod 306 and a movable rack 305 are slidably connected thereto. The extension rod 306 is located between the fixed rack 304 and the movable rack 305. A toothed ring 307 is rotatably connected to the surface of the extension rod 306, and the toothed ring 307 meshes with the fixed rack 304 and the movable rack 305 respectively.

[0025] A U-shaped plate 308 is sleeved on the outside of the drive box 301. The insertion hole on the inner side of the U-shaped plate 308 is fixedly connected to one end of the extension rod 306 extending to the outside of the drive box 301. A traction head 309 is fixedly connected to the outside of the U-shaped plate 308.

[0026] By setting up an adjustable traction device 3, the extension rod 306 can drive the U-shaped plate 308 to slide vertically on the outside of the drive box 301, causing the U-shaped plate 308 to drive the traction head 309 to adjust its height. In addition, the spacing adjustment of the movable rack 305 and the fixed rack 304 can lock the extension rod 306 at a certain height through the gear ring 307, so that the traction head 309 can be positioned after the height adjustment is completed. This allows the bracket to be adjusted according to the actual traction height of the traction equipment on site, thereby ensuring the normal traction of the external traction equipment and improving the retraction efficiency of the bracket.

[0027] Specifically, a slide rod 311 is installed inside the follower cavity 303, and a collar 310 is fixedly installed on the inner wall of the U-shaped plate 308. The inner ring of the collar 310 is slidably connected to the surface of the slide rod 311.

[0028] In this embodiment, by setting a sliding connection between the slide rod 311 and the collar 310, the U-shaped plate 308 can be guided and limited when sliding vertically, which avoids the U-shaped plate 308 from deviating or shaking during the sliding process, and ensures the stability and accuracy of the sliding of the U-shaped plate 308.

[0029] Specifically, a pull rod 312 is installed at the top of the movable rack 305, and a through opening 313 is provided at the top of the drive box 301. The pull rod 312 extends through the through opening 313 to the top of the drive box 301. A locking rod 314 is hinged to the outside of the pull rod 312. Two locking holes 315 are provided at the top of the drive box 301, and the locking rod 314 is adapted to the locking holes 315.

[0030] In this embodiment, by pulling the lever 312, the movable rack 305 can slide inside the drive cavity 302, thereby adjusting the distance between the movable rack 305 and the fixed rack 304, so that the movable rack 305 and the fixed rack 304 can engage and lock the gear ring 307, thereby cooperating with the gear ring 307 to lock the extension rod 306 at a certain height.

[0031] Once the movable rack 305 has slid to the desired position, the locking rod 314 can be rotated into the corresponding locking hole 315, thereby locking the pull rod 312 and the movable rack 305. This prevents the movable rack 305 from sliding without operation, ensuring stability and reliability after adjustment. The locking rod 314 and the locking hole 315 are compatible, ensuring both secure and convenient locking.

[0032] In use, the hydraulic support is moved to the designated position in the roadway by moving the base 2, and then the hydraulic cylinder 105 is activated to cause the top beam 103 to gradually contact the top of the underground roadway, so that the hydraulic support begins to provide support and reinforcement.

[0033] When the hydraulic support needs to be retracted, the operator can adjust the position of the movable rack 305 by pulling the tie rod 312 according to the height requirements of the on-site traction equipment. As the movable rack 305 slides, the distance between it and the fixed rack 304 changes, allowing the toothed ring 307 to mesh and rotate on the teeth of the fixed rack 304, indirectly adjusting the height of the extension rod 306 and enabling the height of the U-shaped plate 308 to be adjusted synchronously.

[0034] Once the traction head 309 reaches the required height, the operator only needs to rotate the locking rod 314 into the corresponding locking hole 315 to achieve a stable lock on the movable rack 305, thereby ensuring that the height of the traction head 309 no longer changes and preventing the movable rack 305 from sliding without operation.

[0035] The external traction device is then connected to the traction head 309, and the external traction device is then activated to cause the hydraulic support to begin traction.

[0036] In summary, the hydraulic support for top coal caving in this soft coal seam, by setting up an adjustable traction device 3, utilizes the extension rod 306 to drive the U-shaped plate 308 to slide vertically on the outside of the drive box 301, causing the U-shaped plate 308 to drive the traction head 309 to adjust its height. Furthermore, the adjustable spacing between the movable rack 305 and the fixed rack 304 allows the extension rod 306 to be height-locked via the gear ring 307. This ensures the positioning of the traction head 309 after height adjustment, enabling the support to adjust according to the actual traction height of the on-site traction equipment. This guarantees the normal traction of the external traction equipment and improves the retraction efficiency of the support.

[0037] It should be noted that the specific model and specifications of the hydraulic cylinder 105 in the top coal caving hydraulic support of the soft coal seam need to be selected and determined according to the actual specifications of the device. The specific selection and calculation method adopts the existing technology in this field, so it will not be described in detail here.

[0038] Furthermore, the power supply and operating principle of the hydraulic cylinder 105 in the hydraulic support for top coal caving in soft coal seams are clear to those skilled in the art, and will not be described in detail here.

[0039] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A hydraulic support for top coal caving in soft coal seams, comprising a hydraulic support structure (1), characterized in that: The bottom end of the hydraulic support structure (1) is movably connected to a movable base (2), and the top end of the movable base (2) is fixedly installed with an adjustable traction device (3). The adjustable traction device (3) includes a drive box (301), the bottom end of which is fixedly connected to the top end of the movable base (2). The drive box (301) is divided into a drive cavity (302) and a follower cavity (303). A fixed rack (304) is installed inside the drive cavity (302), and an extension rod (306) and a movable rack (305) are slidably connected. The extension rod (306) is located between the fixed rack (304) and the movable rack (305). A toothed ring (307) is rotatably connected to the surface of the extension rod (306), and the toothed ring (307) meshes with the fixed rack (304) and the movable rack (305) respectively. A U-shaped plate (308) is sleeved on the outside of the drive box (301). The insertion hole on the inside of the U-shaped plate (308) is fixedly connected to one end of the extension rod (306) extending to the outside of the drive box (301). A traction head (309) is fixedly connected to the outside of the U-shaped plate (308).

2. The hydraulic support for top coal caving in soft coal seams according to claim 1, characterized in that: The hydraulic support structure (1) includes a base plate (101), which is fixedly connected to the top of the movable base (2). The top of the base plate (101) is hinged to a top beam (103) via a movable frame (102), and an extension plate (104) is movably connected to the front side of the top beam (103).

3. The hydraulic support for top coal caving in soft coal seams according to claim 2, characterized in that: A hydraulic cylinder (105) is fixedly installed at the top of the base plate (101), and the movable end of the hydraulic cylinder (105) is hinged to the bottom end of the top beam (103).

4. The hydraulic support for top coal caving in soft coal seams according to claim 1, characterized in that: The follower cavity (303) is equipped with a slide rod (311), and the inner wall of the U-shaped plate (308) is fixedly equipped with a collar (310). The inner ring of the collar (310) is slidably connected to the surface of the slide rod (311).

5. A hydraulic support for top coal caving in soft coal seams according to claim 1, characterized in that: A pull rod (312) is installed at the top of the movable rack (305), and a through-hole (313) is opened at the top of the drive box (301). The pull rod (312) extends through the through-hole (313) to the top of the drive box (301).

6. A hydraulic support for top coal caving in soft coal seams according to claim 5, characterized in that: A locking rod (314) is hinged to the outside of the pull rod (312), and two locking holes (315) are opened at the top of the drive box (301). The locking rod (314) is adapted to the locking holes (315).

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