Gate-type forepoling for coal mine

Abstract

The utility model belongs to the technical field of coal seam mining, and discloses a gate-type forepoling for a coal mine, which comprises two symmetrically arranged frame devices for lifting, pushing and supporting, and two base devices symmetrically arranged between the bottoms of the two frame devices and used for bearing and telescopically moving, an auxiliary moving device used for extending and supporting the ground to roll is arranged in the base device. The base device comprises two base bodies which are symmetrically arranged, a telescopic jack is installed between the base bodies, two inclined guide plates are symmetrically arranged at the two ends of each base body, and a containing cavity is formed in each base body; the auxiliary moving device comprises a lever reinforcement assembly, and two walking rolling wheels are symmetrically installed at the bottom end of the lever reinforcement assembly. According to the gate-type forepoling for the coal mine, the walking rollers and the base plane support are quickly switched, so that the frictional resistance during moving is reduced, the plane stress during supporting is ensured, the stability is improved, and the gate-type forepoling is particularly suitable for a quick advancing scene of a crossheading of a coal face.

Description

Technical Field

[0001] This utility model belongs to the field of coal seam mining technology, and in particular relates to a portal-type advance support for coal mines. Background Technology

[0002] In fully mechanized coal mining faces, the portal frame advance support, as a key component of the hydraulic support system, undertakes the dual mission of roof support and roadway advance support. This equipment adopts a portal frame structure design and achieves overall lifting and lateral movement through hydraulic cylinder drive. It can effectively cope with the roof fracture zone under mining pressure, providing a stable and safe space for coal mining machine operations, and has become the standard configuration for fully mechanized coal mining faces in large and medium-sized coal mines in my country. Actual measurement data from a mine in Shanxi Province in 2023 showed that this technology reduced the roof accident rate by 67%.

[0003] Comparing with Chinese Patent No. CN222835796U, a portal-type advanced support for coal mines is disclosed, comprising multiple sets of unit support bodies. Each unit support body includes a gantry and telescopic jacks. The gantry has two sets, front and rear, and four telescopic jacks are arranged symmetrically between the two sets of gantry. The gantry includes a bottom sliding shoe and a square tube, with two sets of both. The front and rear sets of gantry of each unit support body extend through telescopic columns to allow the top beam to simultaneously connect with the roof, serving as temporary support for the end roadway. Then, using the rear gantry as a fulcrum, the telescopic columns of the front gantry are lowered, and the telescopic jacks are adjusted to push the front gantry forward. The rear gantry slides forward in the same manner to complete the self-movement of the support. Thus, a multi-column support structure is adopted, resulting in good overall frame stability, high reliability, low initial support force, and easy roof control.

[0004] However, when the aforementioned patented device is moved, the bottom sliding shoe forms planar sliding friction with the tunnel floor, which increases the resistance, making the movement more difficult and easily causing wear on the bottom sliding shoe. Therefore, a new device needs to be designed. Utility Model Content

[0005] The purpose of this utility model is to provide a portal-type advance support for coal mines to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A portal-type advance support for coal mines includes two symmetrically arranged frame devices for lifting and pushing support, and two symmetrically installed base devices for supporting and telescopic movement between the bottoms of the two frame devices. Each base device contains an auxiliary moving device for extending to support ground rolling. Each frame device includes two symmetrically arranged limiting tubes, each containing a telescopic column, and a supporting component between the tops of the telescopic columns. Each base device includes two symmetrically arranged base bodies, with a telescopic jack between the base bodies. Two inclined guide plates are symmetrically arranged at both ends of each base body, and a side-pushing component is located at the top of each base body. A receiving cavity is located within the base body. Each auxiliary moving device includes a lever amplification component, with two symmetrically installed traveling rollers at the bottom and an upper rotating shaft rotatably mounted at the top. Two auxiliary hydraulic cylinders are symmetrically installed at both ends of the upper rotating shaft, and a lower rotating shaft is located between the bottoms of the auxiliary hydraulic cylinders.

[0008] Furthermore: the supporting component includes a supporting main beam connected between the tops of the two telescopic columns, the supporting main beam and the tops of the telescopic columns are rotatably connected by column pins, and several cantilever beams are evenly distributed on both sides of the supporting main beam.

[0009] Furthermore, the telescopic column adopts a three-section hydraulic cylinder, and the limiting square tube is fixedly installed at the center of the top of the base body.

[0010] Furthermore, the side-push assembly includes two side-push cylinders arranged symmetrically at the center, and a side-push plate is installed at the telescopic end of each side-push cylinder.

[0011] Furthermore, the side-push cylinder is fixedly installed on the top of the base body at one end away from the telescopic jack.

[0012] Furthermore, the lever amplification assembly includes a central pivot shaft on which a rocker arm is rotatably mounted.

[0013] Furthermore, the central rotating shaft and the lower rotating shaft are respectively rotatably connected to the base body.

[0014] Compared with existing technologies, the beneficial effects are:

[0015] The rapid switching between the traveling rollers and the base plane support reduces frictional resistance during movement and ensures planar force during support, increasing stability. It is particularly suitable for the rapid advancement of the roadway in a coal mining face.

[0016] The lever-assisted walking system, with the auxiliary cylinder driving the rocker arm mechanism, uses the central pivot as the fulcrum to achieve low-power extension / retraction of the walking rollers, saving more than 30% of effort compared to the traditional direct lifting solution;

[0017] Alternating step-by-step movement, the two bases are alternately propelled by telescopic jacks serving as fulcrums, and the inclined guide plate reduces movement resistance, achieving self-movement without the need for external equipment. When the traveling rollers are retracted, the bases are fully grounded, ensuring no stress concentration during the support phase. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of a portal-type advance support for coal mines according to the present invention;

[0019] Figure 2 This is an appearance drawing of a portal-type advance support for coal mines according to the present invention;

[0020] Figure 3 This is a schematic diagram of the base device of a portal-type advance support for coal mines according to the present invention;

[0021] Figure 4 This is a front perspective view of the base device of the portal-type advance support for coal mines described in this utility model;

[0022] Figure 5 This is a schematic diagram of the frame device of a portal-type advance support for coal mines as described in this utility model;

[0023] Figure 6 This is a schematic diagram of an auxiliary moving device for a portal-type advance support in coal mines, as described in this utility model.

[0024] In the attached diagram, the following are the reference numerals: 101, base body; 102, inclined guide plate; 103, telescopic jack; 104, side push cylinder; 105, side push plate; 106, storage cavity; 201, limiting square tube; 202, telescopic column; 203, supporting main beam; 204, cantilever beam; 205, column pin; 301, central pivot; 302, rocker arm; 303, traveling roller; 304, upper pivot; 305, auxiliary cylinder; 306, lower pivot. Detailed Implementation

[0025] 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.

[0026] Please see Figures 1-6A portal-type advance support for coal mines includes two symmetrically arranged frame devices for lifting and pushing support, and two symmetrically installed base devices for supporting and telescopic movement between the bottoms of the two frame devices. The base devices are equipped with auxiliary moving devices for extending to support ground rolling.

[0027] In this embodiment: the frame device includes two symmetrically arranged limiting square tubes 201, and telescopic columns 202 are installed inside the limiting square tubes 201. A support assembly is installed between the tops of the telescopic columns 202. The support assembly includes a support main beam 203 connected between the tops of the two telescopic columns 202. The support main beam 203 and the tops of the telescopic columns 202 are rotatably connected by column pins 205. Several cantilever beams 204 are evenly distributed on both sides of the support main beam 203. The telescopic columns 202 are equipped with three-section hydraulic cylinders. The limiting square tubes 201 are fixedly installed at the center of the top of the base body 101. During support, the bottom plane of the base body 101 contacts the roadway ground. The telescopic columns 202 are extended by the limiting square tubes 201. The support main beam 203 and the cantilever beams 204 are pushed to the top by the column pins 205, which plays the role of temporary support for the roadway.

[0028] In this embodiment: the base device includes two symmetrically arranged base bodies 101, with a telescopic jack 103 installed between the base bodies 101. Two inclined guide plates 102 are symmetrically arranged at both ends of the base bodies 101. A side-push assembly is provided on the top of the base body 101, and a storage cavity 106 is provided inside the base body 101. The side-push assembly includes two centrally symmetrically arranged side-push cylinders 104, with a side-push plate 105 installed on the telescopic end of the side-push cylinder 104. The side-push cylinder 104 is fixedly installed on the top end of the base body 101 away from the telescopic jack 103. During support, the bottom plane of the base body 101 contacts the roadway floor, forming support. During movement, the traveling roller 303 in the storage cavity 106 inside the front base body 101 first extends out of the storage cavity 106, contacts the roadway floor, lifts one end of the base body 101, and then the telescopic jack 103... 3. With the support of the rear base body 101, it extends and pushes the front base body 101 forward with the support of the traveling roller 303. At the same time, the inclined guide plate 102 increases the smoothness of movement. After moving into place, the traveling roller 303 is retracted into the storage cavity 106. The bottom plane of the front base body 101 contacts the roadway floor again and forms support again. Then, the rear base body 101 operates in the same way as above. The telescopic jack 103 retracts with the support of the front base body 101 and pulls the rear base body 101 forward with the support of the traveling roller 303. Finally, it unfolds again with the same steps as above to form support and complete one self-movement. The above actions are repeated to carry out the next cycle of operation. When it is necessary to turn or deviate, the corresponding side push cylinder 104 extends and pushes the side push plate 105 to push the side of the roadway for correction.

[0029] In this embodiment: the auxiliary moving device includes a lever amplifying component, with two symmetrically mounted walking rollers 303 at the bottom end of the lever amplifying component, and an upper rotating shaft 304 rotatably mounted at the top end of the lever amplifying component. Two auxiliary hydraulic cylinders 305 are symmetrically mounted at both ends of the upper rotating shaft 304, and a lower rotating shaft 306 is disposed between the bottoms of the auxiliary hydraulic cylinders 305. The lever amplifying component includes a central rotating shaft 301, with a rocker arm 302 rotatably mounted on the central rotating shaft 301. The central rotating shaft 301 and the lower rotating shaft 306 are respectively connected to the base body. 101 Rotary connection; During movement, the auxiliary cylinder 305 in the storage cavity 106 inside the base body 101 extends under the support of the lower rotating shaft 306, pushing the upper rotating shaft 304 to push the rocker arm 302 to rotate under the support of the central rotating shaft 301, so that the traveling roller 303 at the bottom of the rocker arm 302 extends out of the storage cavity 106, contacts the roadway ground, lifts one end of the base body 101 for movement, and after moving into place, the auxiliary cylinder 305 retracts, so that the traveling roller 303 is retracted into the storage cavity 106.

[0030] Working principle: During support, the bottom plane of the base body 101 contacts the roadway ground. The telescopic column 202 is extended by the limiting square tube 201, and the column pin 205 pushes the supporting main beam 203 and cantilever beam 204 to the top, thus playing the role of temporary roadway support.

[0031] During movement, the telescopic column 202 at the front retracts first, causing the supporting main beam 203 and cantilever beam 204 to detach from the roadway roof. Then, the auxiliary cylinder 305 in the corresponding base body 101's storage cavity 106 extends under the support of the lower rotating shaft 306, pushing the upper rotating shaft 304 to rotate the rocker arm 302 under the support of the central rotating shaft 301. This causes the traveling roller 303 at the bottom of the rocker arm 302 to extend out of the storage cavity 106 and contact the roadway floor, lifting one end of the base body 101. Then, the telescopic jack 103 extends under the support of the rear base body 101, pushing the front base body 101 forward under the support of the traveling roller 303. At the same time, the inclined guide plate 102 increases the smoothness of movement. After moving into position, the auxiliary cylinder 305 retracts. The travel rollers 303 retract into the storage cavity 106, and the bottom plane of the front base body 101 contacts the roadway floor again. The telescopic column 202 extends again, allowing the supporting main beam 203 and cantilever beam 204 to connect and form support again. Then, the rear base body 101 operates in the same way as above. The telescopic jack 103 retracts under the support of the front base body 101, pulling the rear base body 101 forward under the support of the travel rollers 303. Finally, it unfolds again to form support, completing one self-movement. The above actions are repeated for the next cycle of operation. When it is necessary to turn or deviate, the corresponding side push cylinder 104 extends to push the side push plate 105 to push the side of the roadway for correction.

[0032] 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 portal-type advance support for coal mines, comprising two symmetrically arranged frame devices for lifting and pushing support, characterized in that: It also includes two base devices symmetrically installed between the bottoms of the two frame devices for supporting and telescopic movement, and the base devices are provided with auxiliary moving devices for extending to support the rolling of the ground. The frame device includes two symmetrically arranged limiting tubes (201), and telescopic columns (202) are installed inside the limiting tubes (201). A support component is installed between the tops of the telescopic columns (202). The base device includes two symmetrically arranged base bodies (101), a telescopic jack (103) is installed between the base bodies (101), two inclined guide plates (102) are symmetrically arranged at both ends of the base bodies (101), a side push assembly is provided on the top of the base bodies (101), and a storage cavity (106) is provided inside the base bodies (101). The auxiliary moving device includes a lever amplification component. Two traveling rollers (303) are symmetrically installed at the bottom of the lever amplification component. An upper rotating shaft (304) is rotatably installed at the top of the lever amplification component. Two auxiliary oil cylinders (305) are symmetrically installed at both ends of the upper rotating shaft (304). A lower rotating shaft (306) is provided between the bottoms of the auxiliary oil cylinders (305).

2. The portal-type advance support for coal mines according to claim 1, characterized in that: The supporting component includes a supporting main beam (203) connected between the top ends of the two telescopic columns (202). The supporting main beam (203) and the top ends of the telescopic columns (202) are rotatably connected by column pins (205). Several cantilever beams (204) are evenly distributed on both sides of the supporting main beam (203).

3. A portal-type advance support for coal mines according to claim 2, characterized in that: The telescopic column (202) adopts a three-section hydraulic cylinder, and the limiting square tube (201) is fixedly installed at the top center of the base body (101).

4. A portal-type advance support for coal mines according to claim 1, characterized in that: The side-push assembly includes two side-push cylinders (104) arranged symmetrically at the center, and a side-push plate (105) is installed at the telescopic end of the side-push cylinder (104).

5. A portal-type advance support for coal mines according to claim 4, characterized in that: The side-push cylinder (104) is fixedly installed on the top of the base body (101) at the end away from the telescopic jack (103).

6. A portal-type advance support for coal mines according to claim 1, characterized in that: The lever amplification assembly includes a central pivot (301), on which a rocker arm (302) is rotatably mounted.

7. A portal-type advance support for coal mines according to claim 6, characterized in that: The central rotating shaft (301) and the lower rotating shaft (306) are respectively rotatably connected to the base body (101).

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