Movable efficient and stable hydraulic support for coal mining

Abstract

The invention discloses a movable efficient and stable coal mining hydraulic support, and relates to the technical field of hydraulic supports, the movable efficient and stable coal mining hydraulic support comprises a hydraulic support main body, a fixed base and a supporting top plate, the fixed base is arranged at the bottom end of the hydraulic support main body, and the supporting top plate is arranged at the top end of the hydraulic support main body; two groups of reinforcing structures are arranged on the bottom surface of the fixed base; the supporting area of the fixed base is increased through the telescopic supporting legs, the stability of the hydraulic support body in a mine hole is improved, the fixed base can be fixed by fixing the ends of the telescopic supporting legs to the ground, and the supporting area of the fixed base is adjusted conveniently and rapidly; and the telescopic supporting legs and the first racks can be fixed to improve the stability of the hydraulic support body, the fixing blocks are opened downwards to enable the sliding wheels to slide on the ground, the hydraulic support body can be moved more conveniently, the telescopic supporting legs and the first racks can stretch out through the driving motor, and operation is convenient.

Description

Technical Field

[0001] The invention relates to the technical field of hydraulic supports, in particular to a movable, efficient and stable hydraulic support for coal mining. Background Art

[0002] Hydraulic support for coal mining is a key mechanical equipment used in coal mining working faces. Its main function is to control the mine pressure of the coal mining working face, prevent the roof from falling, and provide a safe and stable working environment for coal mining. The extension and retraction of the columns enable the top beam and the cover beam to support and adjust the roof. The pushing device is used to push the conveyor and the support itself forward. The base contacts the bottom plate, transmits the roof pressure to the bottom plate and bears the roof pressure. The hydraulic support is an important equipment for safe production in coal mines. Its advanced technical performance, economy and reliability are of great significance to ensuring safe production in coal mines.

[0003] In the prior art, when a hydraulic support for coal mining is installed in a coal mine, a fixed base is required to support the equipment or the mine cave to ensure that the coal mine will not collapse. However, since the equipment is not necessarily located in the middle of the supporting top plate, or the equipment is located at the edge of the supporting top plate, the stability of the hydraulic support is relatively poor, which makes the main body of the hydraulic support prone to tilting or tipping, thereby easily causing the coal mine cave to collapse. In addition, when the hydraulic support unloads the load of the support, the hydraulic support needs to be moved a certain distance, but the hydraulic support can only be moved after the fixed base of the hydraulic support is supported, and it is troublesome to support the fixed base. Summary of the invention

[0004] The object of the present invention is to provide a movable, efficient and stable hydraulic support for coal mining to solve the problems raised in the above-mentioned background technology.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] The cam is configured to move the support leg of the hydraulic support frame upwardly and the support leg is configured to move the support leg upwardly and the support leg is configured to move the support leg upwardly and the support leg is configured to move the support leg upwardly and the support leg is configured to move the support leg upwardly and the support leg is configured to move the support leg upwardly.

[0007] As a preferred technical solution of the present invention, the shape of the telescopic support leg is "U"-shaped, the first fixed cavity and the two reserved grooves are arranged in a "U"-shaped pattern, and both ends of the telescopic support leg are respectively located inside the two reserved grooves, and the middle of the telescopic support leg is located inside the first fixed cavity.

[0008] As a preferred technical solution of the present invention, a transverse plate is provided at the bottom end of the fixed base and between the two groups of telescopic support legs, and the cross-section of the fixed base in the middle and at the position of the transverse plate is arranged in an H shape.

[0009] As a preferred technical solution of the present invention, the metal slide rail includes an inner slide rail, a middle slide rail and an outer slide rail. The inner slide rail, the middle slide rail and the outer slide rail are arranged from the inside to the outside. The outer slide rail is fixed to the inner wall of the reserved groove by a first fixing screw, and the inner slide rail is fixed to the side wall of the telescopic support leg by a second fixing screw.

[0010] As a preferred technical solution of the present invention, a moving structure is provided inside both ends of the telescopic support leg. The moving structure includes two second fixed cavities, which are respectively opened inside both ends of the telescopic support leg. First sliding grooves and second sliding grooves are opened on both sides of each second fixed cavity inside the telescopic support leg. The first sliding groove is arranged obliquely downward. A first rack is slidably connected inside the first sliding groove. A second rack is slidably connected inside the second sliding groove. The end of the second rack is fixed to the transverse plate. A spur gear is arranged between the first rack and the second rack inside the telescopic support leg. The edge of the spur gear meshes with both the first rack and the second rack. A driving motor is arranged on the upper surface of the telescopic support leg at the axis of the spur gear. The driving motor is arranged on the upper surface of the fixed base.

[0011] As a preferred technical solution of the present invention, the first sliding groove is arranged obliquely downward, and the first sliding groove is adapted to the inclination angle of the first rack. The first rack is used to support the hydraulic support main body. The width of the spur gear is greater than the width of the first rack and the width of the second rack. The end of the first rack is slidably connected to the end of the telescopic support leg. The end of the second rack is slidably connected to the middle of the telescopic support leg.

[0012] As a preferred technical solution of the present invention, a mating groove is opened on the upper surface of the fixed base at each driving motor, and the end face of the driving motor is slidably connected to the inside of the mating groove. The mating groove is used to limit the relative rotation of the driving motor with respect to the mating groove.

[0013] As a preferred technical solution of the present invention, a fixed block is provided at the end of each of the first racks and located outside the telescopic support foot, and a sliding wheel is provided inside the bottom end of the fixed block. The sliding wheels are distributed at the four corners of the fixed base, and the four sliding wheels are used to move the hydraulic support body.

[0014] As a preferred technical solution of the present invention, two fastening bolts are horizontally arranged inside the fixing block, and two fixing holes are opened at the end of each first rack. The ends of the two fastening bolts are respectively screwed into the inside of the two fixing holes, and the ends of the two fastening bolts are fixed to the end of the first rack.

[0015] As a preferred technical solution of the present invention, the opening direction of the fixing block is upward or downward, and when the opening direction of the fixing block is downward, the sliding wheel is in contact with the ground.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] A reinforcement structure is provided, and the telescopic support foot is slidably connected with the reserved groove inside the fixed base and the first fixed cavity. The telescopic support foot can be pulled out from the fixed base, and the support area of ​​the fixed base is increased by the telescopic support foot, thereby improving the stability of the hydraulic support body in the mine cave. The end of the telescopic support foot can also be fixed to the ground to fix the fixed base;

[0018] A moving structure is provided, and the telescopic support foot is extended from the inside of the fixed base and the first rack is extended from the inside of the telescopic support foot by meshing the spur gear with the first rack and the second rack, so that the support area of ​​the fixed base can be adjusted more conveniently and quickly, and the telescopic support foot and the first rack can also be fixed to increase the stability of the hydraulic support body;

[0019] The first sliding groove and the first rack are arranged obliquely, so that the end of the first rack is close to the ground when the first rack is extended from the telescopic support foot, the opening direction of the fixing block is upward so that the fixing block contacts the ground, which is more convenient for fixing the end of the first rack, and the opening direction of the fixing block is downward so that the sliding wheel slides with the ground, which is more convenient for moving the main body of the hydraulic support;

[0020] The spur gear is driven by a driving motor, so that the spur gear drives the first rack and the second rack to move. The telescopic support foot and the first rack can be extended manually or by a driving motor, which is convenient to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings.

[0022] Figure 1 It is the main structure diagram of the present invention;

[0023] Figure 2 It is a schematic diagram of the interior of the fixed base of the present invention;

[0024] Figure 3 It is a schematic diagram of the reinforcement structure of the present invention;

[0025] Figure 4 This is a schematic diagram of the telescopic support leg of the present invention being pulled out;

[0026] Figure 5 It is a schematic diagram of the metal slide rail of the present invention;

[0027] Figure 6 It is a schematic diagram of the mobile structure of the present invention;

[0028] Figure 7 It is a schematic diagram of extending the first rack of the present invention;

[0029] Figure 8 This is a schematic diagram of a state in which the opening direction of the fixing block of the present invention is downward;

[0030] Fig. 9 It is a schematic diagram of the fixing block of the present invention in an upward opening state.

[0031] In the figure: 1. hydraulic support body; 2. fixed base; 3. supporting top plate; 4. reinforcement structure; 41. reserved groove; 42. first fixed cavity; 43. telescopic supporting foot; 44. metal slide rail; 441. inner slide rail; 442. middle slide rail; 443. outer slide rail; 45. first fixing screw; 46. second fixing screw; 47. transverse plate; 5. moving structure; 51. second fixed cavity; 52. first sliding groove; 53. second sliding groove; 54. first rack; 55. second rack; 56. spur gear; 57. driving motor; 58. fixing block; 59. sliding wheel; 510. fixing hole; 511. fastening bolt; 512. matching groove. DETAILED DESCRIPTION

[0032] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] Embodiment 1:

[0034] See also Figure 1-Figure 4As shown in the figure, a movable, highly efficient and stable hydraulic support for coal mining includes a hydraulic support main body 1, a fixed base 2 and a support roof 3. The fixed base 2 is arranged at the bottom end of the hydraulic support main body 1, and the support roof 3 is arranged at the top end of the hydraulic support main body 1. The support roof 3 can be lifted by the hydraulic components in the hydraulic support main body 1, and the support roof 3 is used to support the mine tunnel or the coal mining equipment. Two groups of reinforcement structures 4 are arranged on the bottom surface of the fixed base 2. The two groups of reinforcement structures 4 are symmetrically arranged at the bottom end of the fixed base 2. The fixed base 2 is reinforced by the two groups of reinforcement structures 4 to increase the support area of the fixed base 2. Each reinforcement structure 4 includes a first fixed cavity 42 and two reserved slots 41. The first fixed cavity 42 and the two reserved slots 41 are opened on one side of the bottom end of the fixed base 2, and the first fixed cavity 42 is located between the two reserved slots 41. Thus, each group of reserved slots 41 communicates with the first fixed cavity 42, so that the telescopic support feet 43 can be located in the reserved slots 41 and the first fixed cavity 42. The telescopic support feet 43 are arranged inside the fixed base 2 at the bottom end and in the reserved slots 41 and the first fixed cavity 42. The telescopic support feet 43 are slidably connected to the inside of the reserved slots 41 and the first fixed cavity 42. Metal slide rails 44 are arranged on the side walls at both ends of the telescopic support feet 43. The two ends of the telescopic support feet 43 are connected to the inside of the fixed base 2 through the metal slide rails 44. The telescopic support feet 43 are used to stabilize the fixed base 2. The telescopic support feet 43 can be pulled out from the reserved slots 41 and the first fixed cavity 42. The metal slide rails 44 are used to reduce the resistance of pulling out the telescopic support feet 43. Moreover, the fixed base 2 is supported by the four telescopic support feet 43 of the two groups of reinforcement structures 4. Thus, the fixed base 2 can be reinforced by the telescopic support feet 43. The extended telescopic support feet 43 can also improve the stability of the fixed base 2.

[0035] Please refer to Figure 3 and Figure 4 As shown in the figure, the telescopic support feet 43 are in a "U" shape. The first fixed cavity 42 and the two reserved slots 41 are arranged in a "U" shape. The "U"-shaped telescopic support feet 43 can be placed inside the "U"-shaped reserved slots 41 and the first fixed cavity 42. The two ends of the telescopic support feet 43 are respectively located inside the two reserved slots 41, and the middle of the telescopic support feet 43 is located inside the first fixed cavity 42. Only by pulling the telescopic support feet 43 so that the two ends of the telescopic support feet 43 are pulled out from the inside of the reserved slots 41, the hydraulic support can be supported by the telescopic support feet 43.

[0036] Please refer to Figure 3 and Figure 4As shown, a transverse plate 47 is provided at the bottom end of the fixed base 2 and between the two groups of telescopic supporting legs 43, and the cross section in the middle of the fixed base 2 and at the position of the transverse plate 47 is arranged in an H shape. The transverse plate 47 can be used to separate the two groups of telescopic supporting legs 43, so that the two groups of reinforcement structures 4 can work independently.

[0037] See also Figure 3 and Figure 5 As shown, the metal slide rail 44 includes an inner slide rail 441, a middle slide rail 442 and an outer slide rail 443, which are arranged from the inside to the outside, and the inner slide rail 441, the middle slide rail 442 and the outer slide rail 443 are mutually restricted by shape, and there are steel balls between the inner slide rail 441, the middle slide rail 442 and the outer slide rail 443 to reduce the resistance between the telescopic support leg 43 and the fixed base 2 when the telescopic support leg 43 is pulled out. The outer slide rail 443 is fixed to the inner wall of the reserved groove 41 by the first fixing screw 45, and the inner slide rail 441 is fixed to the side wall of the telescopic support leg 43 by the second fixing screw 46. The inner slide rail 441 and the outer slide rail 443 of the metal slide rail 44 are respectively fixed to the side wall of the telescopic support leg 43 and the inner wall of the reserved groove 41, so that it is more convenient to pull the telescopic support leg 43 out of the reserved groove 41, and the telescopic support leg 43 can be pulled out in any occasion.

[0038] It should be noted that the hydraulic support body 1 is assembled in the coal mine cave, and the hydraulic elements in the hydraulic support body 1 are used to support the support top plate 3. The mine cave can be supported by the support top plate 3 to avoid the risk of mine cave collapse, or the support top plate 3 is used to support coal mining equipment to ensure that the coal mining equipment has a good support platform. During this period, the hydraulic support may be unstable when supporting the mine cave or equipment. The equipment can be reinforced by the reinforcement structure 4 at the fixed base 2. Specifically, the two groups of reinforcement structures 4 or one group of reinforcement structures 4 are operated, specifically, the telescopic support foot 43 is pulled out from the inside of the reserved groove 41. At this time, the telescopic support foot 4 The middle part of the telescopic support foot 43 slides in the first fixed cavity 42, so that the two ends of the telescopic support foot 43 extend from the two reserved grooves 41, thereby increasing the extension length of the telescopic support foot 43, and using one or two groups of telescopic support foot 43 The two end positions are used to increase the support area of ​​the fixed base 2, so that the hydraulic support body 1 is more stable, and the extended end of the telescopic support foot 43 can be fixed to the ground by fastening devices such as bolts to ensure that the end of the telescopic support foot 43 of the fixed base 2 is firm and stable, and the inner slide rail 441, the middle slide rail 442 and the outer slide rail 443 of the metal slide rail 44 can be used to more conveniently pull the telescopic support foot 43 out of the fixed base 2.

[0039] See also Figure 2 , Figure 6 and Figure 7As shown, a moving structure 5 is provided inside both ends of the telescopic supporting foot 43, and the moving structure 5 includes two second fixed cavities 51, and the two second fixed cavities 51 are respectively opened inside both ends of the telescopic supporting foot 43, and the second fixed cavity 51 is used to place the components of the moving structure 5, and a first sliding groove 52 and a second sliding groove 53 are opened inside the telescopic supporting foot 43 and on both sides of each second fixed cavity 51, and the first sliding groove 52 is arranged obliquely downward, and a first rack 54 is slidably connected inside the first sliding groove 52, and the first rack 54 is located inside the first sliding groove 52 and slides, so that the first rack 54 slides along the inclined first sliding groove 52, and when the first rack 54 extends out of the first sliding groove 52, the end of the first rack 54 is close to the ground, and a second rack 55 is slidably connected inside the second sliding groove 53, and the end of the second rack 55 is fixed to the transverse plate 47, and when the telescopic supporting foot 43 is away from the transverse plate 47, the second rack 55 is pulled by the transverse plate 47, and the telescopic supporting foot 43 and the first rack A spur gear 56 is arranged between the first rack 54 and the second rack 55, and the edge of the spur gear 56 is meshed with the first rack 54 and the second rack 55. A driving motor 57 is arranged on the upper surface of the telescopic supporting foot 43 and at the axis of the spur gear 56. The driving motor 57 is arranged on the upper surface of the fixed base 2. When the telescopic supporting foot 43 is manually pulled out, the second rack 55 is pulled by the transverse plate 47, so that the second rack 55 moves relative to the spur gear 56, so that the spur gear 56 rotates and drives the first rack 54 to move, so that the end of the first rack 54 is extended out, and the end of the second rack 55 can be extended into the ground or underground, or the first rack 54 can be fixed with bolts or reinforcement devices, so that the end of the first rack 54 can also increase the telescopic supporting foot 43 and The ground is firmly fixed, the driving motor 57 can also be used to drive the spur gear 56 to move the first rack 54 and the second rack 55. The telescopic supporting foot 43 can be extended from the fixed base 2 without manually operating the telescopic supporting foot 43, which is more convenient.

[0040] See also Figure 6 and Figure 7As shown, the first sliding groove 52 is arranged tilted downward, and the first sliding groove 52 is adapted to the inclination angle of the first rack 54. When the first rack 54 is extended, the tilted first sliding groove 52 and the first rack 54 can make the end of the first rack 54 close to the bottom surface. The first rack 54 is used to support the end of the telescopic support foot 43. The width of the spur gear 56 is greater than the width of the first rack 54 and the width of the second rack 55. Since the first rack 54 is tilted, when the spur gear 56 is engaged with the first rack 54, the first rack 54 moves and the first rack 54 floats slightly in the vertical direction inside the tilted first sliding groove 52. The end of the first rack 54 is slidably connected to the end of the telescopic support foot 43, the end of the second rack 55 is slidably connected to the middle of the telescopic support foot 43, and the end of the first rack 54 and the end of the second rack 55 are respectively slidably connected to the telescopic support foot 43, thereby ensuring that the first rack 54 and the second rack 55 are extended from the telescopic support foot 43.

[0041] See also Figure 7 As shown, a mating groove 512 is provided on the upper surface of the fixed base 2 and at each drive motor 57, and the end face of the drive motor 57 is slidably connected to the inside of the mating groove 512, and the mating groove 512 is used to limit the rotation of the drive motor 57 relative to the mating groove 512. When the drive motor 57 drives the spur gear 56 to rotate, it will drive the telescopic support leg 43 to extend from the fixed base 2, thereby the drive motor 57 moves relative to the telescopic support leg 43, so that the drive motor 57 moves inside the mating groove 512, thereby ensuring that the drive motor 57 can normally drive the spur gear 56 to rotate. The telescopic support leg 43 can be automatically extended by the drive motor 57 without manual operation, which is more convenient.

[0042] See also Figure 6-Figure 8 As shown, a fixed block 58 is provided at the end of each first rack 54 and located outside the telescopic support foot 43, and a sliding wheel 59 is provided inside the bottom end of the fixed block 58. The sliding wheel 59 rolls inside the fixed block 58. The sliding wheels 59 are distributed at the four corners of the fixed base 2. The four sliding wheels 59 are used to move the hydraulic support body 1. The four inclined first racks 54 can support the fixed base 2 after extending out, and the fixed base 2 of the hydraulic support body 1 can be moved by using the sliding wheels 59.

[0043] See also Figure 8 and Fig. 9As shown, two fastening bolts 511 are transversely arranged inside the fixing block 58, and two fixing holes 510 are opened at the end of each first rack 54. The ends of the two fastening bolts 511 are respectively screwed into the inside of the two fixing holes 510, and the ends of the two fastening bolts 511 are fixed to the end of the first rack 54. The fixing block 58 and the first rack 54 are fixed by the fastening bolts 511, so that the fixing block 58 is installed at the end of the first rack 54.

[0044] See also Figure 8 and Fig. 9 As shown, the opening direction of the fixed block 58 is upward or downward, and the sliding wheel 59 is in contact with the ground when the opening direction of the fixed block 58 is downward. The fixed block 58 can be used to contact the ground when the opening direction of the fixed block 58 is upward, and the sliding wheel 59 can be used to contact the ground when the opening direction of the fixed block 58 is downward.

[0045] It should be noted that when the telescopic support foot 43 is manually pulled out, the transverse plate 47 is welded to the second rack 55 so that the second rack 55 drives the spur gear 56 to rotate, and the rotation of the spur gear 56 can drive the first rack 54 to move relatively, and the end of the first rack 54 can be extended from the end of the telescopic support foot 43. Similarly, the spur gear 56 can be driven to rotate by the driving motor 57, so that the spur gear 56 drives the first rack 54 and the second rack 55 to move, so that the telescopic support foot 43 can be extended from the fixed base 2, and the first rack 54 is extended from the telescopic support foot 43. The telescopic support foot 43 and the first rack 54 can increase the support area of ​​the fixed base 2, and the extended telescopic support foot 43 and the first rack 54 have better stability, and the telescopic support foot 43 and the first rack 54 can also be fixed to the ground;

[0046] The fixed block 58 is installed on the end of the first rack 54 by fastening bolts 511, so that the opening direction of the fixed block 58 is upward or the opening direction of the fixed block 58 is downward. When the opening direction of the fixed block 58 is upward, the fixed block 58 can be used to contact the ground. When the opening direction of the fixed block 58 is downward, the sliding wheel 59 can be used to contact the ground, and the sliding wheel 59 can be used to move the fixed base 2.

[0047] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to only specific implementation methods. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A movable, efficient and stable hydraulic support for coal mining, comprising a hydraulic support body (1), a fixed base (2) and a support top plate (3), wherein the fixed base (2) is arranged at the bottom end of the hydraulic support body (1), and the support top plate (3) is arranged at the top end of the hydraulic support body (1), characterized in that: The bottom surface of the fixed base (2) is provided with two groups of reinforcement structures (4). The two groups of reinforcement structures (4) are symmetrically arranged at the bottom end of the fixed base (2). Each reinforcement structure (4) includes a first fixed cavity (42) and two reserved slots (41). The first fixed cavity (42) and the two reserved slots (41) are opened on one side of the bottom end of the fixed base (2), and the first fixed cavity (42) is located between the two reserved slots (41). A telescopic support foot (43) is arranged inside the bottom end of the fixed base (2) and within the reserved slots (41) and the first fixed cavity (42). The telescopic support foot (43) is slidably connected to the inside of the reserved slots (41) and the first fixed cavity (42). Metal slide rails (44) are arranged on the side walls at both ends of the telescopic support foot (43). The two ends of the telescopic support foot (43) are connected to the inside of the fixed base (2) through the metal slide rails (44). The telescopic support foot (43) is used to stabilize the fixed base (2).

2. A movable, efficient and stable hydraulic support for coal mining according to claim 1, characterized in that: The telescopic support foot (43) is in a "U" shape. The first fixed cavity (42) and the two reserved slots (41) are arranged in a "U" shape. The two ends of the telescopic support foot (43) are respectively located inside the two reserved slots (41), and the middle of the telescopic support foot (43) is located inside the first fixed cavity (42).

3. A movable, efficient and stable hydraulic support for coal mining according to claim 2, characterized in that: A transverse plate (47) is arranged at the bottom end of the fixed base (2) and between the two groups of telescopic support feet (43). The cross-section of the middle of the fixed base (2) at the position of the transverse plate (47) is arranged in an "H" shape.

4. A movable, efficient and stable hydraulic support for coal mining according to claim 3, characterized in that: The metal slide rail (44) includes an inner slide rail (441), a middle slide rail (442), and an outer slide rail (443). The inner slide rail (441), the middle slide rail (442), and the outer slide rail (443) are arranged from the inside out. The outer slide rail (443) is fixed to the inner wall of the reserved slot (41) through a first fixing screw (45). The inner slide rail (441) is fixed to the side wall of the telescopic support foot (43) through a second fixing screw (46).

5. The movable, efficient and stable hydraulic support for coal mining according to claim 4 is characterized in that: A moving structure (5) is provided inside the two ends of the telescopic support foot (43), and the moving structure (5) includes two second fixed cavities (51), and the two second fixed cavities (51) are respectively opened inside the two ends of the telescopic support foot (43), and a first sliding groove (52) and a second sliding groove (53) are opened inside the telescopic support foot (43) and on both sides of each second fixed cavity (51), and the first sliding groove (52) is arranged obliquely downward, and the first sliding groove (52) is slidably connected to the first rack (54), and the second sliding groove (53) is provided on both sides of each second fixed cavity (51). A second rack (55) is slidably connected inside the telescopic support leg (43), an end of the second rack (55) is fixed to the transverse plate (47), a spur gear (56) is arranged inside the telescopic support leg (43) and between the first rack (54) and the second rack (55), an edge of the spur gear (56) is meshed with both the first rack (54) and the second rack (55), a driving motor (57) is arranged on the upper surface of the telescopic support leg (43) and at the axis of the spur gear (56), and the driving motor (57) is arranged on the upper surface of the fixed base (2).

6. The movable, efficient and stable hydraulic support for coal mining according to claim 5, characterized in that: The first sliding groove (52) is arranged to be inclined downward, and the first sliding groove (52) is adapted to the inclination angle of the first rack (54); the first rack (54) is used to support the hydraulic support body (1); the width of the spur gear (56) is greater than the width of the first rack (54) and the width of the second rack (55); the end of the first rack (54) is slidably connected to the end of the telescopic support foot (43); and the end of the second rack (55) is slidably connected to the middle of the telescopic support foot (43).

7. A movable, efficient and stable hydraulic support for coal mining according to claim 6, characterized in that: A matching groove (512) is provided on the upper surface of the fixed base (2) and at each driving motor (57), and the end surface of the driving motor (57) is slidably connected to the inside of the matching groove (512), and the matching groove (512) is used to limit the driving motor (57) from rotating relative to the matching groove (512).

8. A movable, efficient and stable hydraulic support for coal mining according to any one of claims 5 to 7, characterized in that: A fixed block (58) is provided at the end of each of the first racks (54) and outside the telescopic support leg (43); a sliding wheel (59) is provided inside the bottom end of the fixed block (58); the sliding wheels (59) are distributed at four corners of the fixed base (2); and the four sliding wheels (59) are used to move the hydraulic support body (1).

9. The movable, efficient and stable hydraulic support for coal mining according to claim 8, characterized in that: Two fastening bolts (511) are transversely arranged inside the fixing block (58), and two fixing holes (510) are opened at the end of each first rack (54). The ends of the two fastening bolts (511) are respectively screwed into the inside of the two fixing holes (510), and the ends of the two fastening bolts (511) are fixed to the end of the first rack (54).

10. A movable, efficient and stable hydraulic support for coal mining according to claim 9, characterized in that: The opening direction of the fixed block (58) is upward or downward, and when the opening direction of the fixed block (58) is downward, the sliding wheel (59) is in contact with the ground.

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