A gantry type lifting device for underground coal mines

Abstract

The present invention discloses a gantry type lifting device for underground coal mines, belonging to the technical field of lifting equipment. It comprises a beam assembly and a plurality of first leg assemblies; the plurality of first leg assemblies are rotatably connected to the beam assembly, the first leg assembly and the beam assembly are fixed by a limit pin, a driving wheel is fixedly installed on the first leg assembly, a telescopic beam frame is plugged and matched on the beam assembly, a second hydraulic cylinder is rotatably connected to the first leg assembly, the output shaft of the second hydraulic cylinder is rotatably connected to the telescopic beam frame, a second leg assembly is fixedly installed on the telescopic beam frame, and a plurality of chain electric hoists are fixedly installed on the telescopic beam frame. The present invention can realize the switching of the supporting position through the arrangement of the first leg assembly and the second leg assembly. After the position is switched, the output shaft of the second hydraulic cylinder returns, driving the first leg assembly to rotate to one side of the second leg assembly, thereby increasing the middle space of the lifting equipment and reducing the difficulty of other equipment passing on the ground rail.

Description

Technical Field

[0001] The present invention relates to the technical field of lifting equipment, and more specifically, to a gantry type lifting device in an underground coal mine. Background Art

[0002] Due to the limitations of factors such as underground lifting, transportation, tunnel section size and ground rail location in coal mines, it is difficult for large lifting equipment to move to the operating point in coal mines. It is necessary to disassemble the various parts of the equipment, transport them one by one to the installation point and then assemble them, which increases the difficulty of lifting equipment operation. In addition, during the operation, the lifting equipment will block the transportation equipment in front and behind, affecting the reciprocating dispatch of other equipment in the tunnel and the coal mine excavation operation. In view of this, we propose a gantry lifting device for underground coal mines. Summary of the invention

[0003] The purpose of the present invention is to provide a gantry type lifting device for underground coal mines, which solves the technical problems in the prior art that the lifting equipment is difficult to move underground in coal mines and affects the scheduling of other operating equipment, thereby improving the flexibility of the lifting equipment and reducing the impact on other operating equipment.

[0004] The embodiment of the present invention provides a gantry type lifting device for underground coal mines, comprising a beam assembly and a plurality of first leg assemblies;

[0005] A plurality of the first leg assemblies are rotatably connected to the beam assembly, the first leg assemblies are fixed to the beam assembly via limit pins, and the first leg assemblies are used to adjust the lifting and lowering of the beam assembly;

[0006] A driving wheel is fixedly mounted on the first leg assembly, and the driving wheel moves on the ground rail;

[0007] Both ends of the beam assembly are plugged with telescopic beam frames, and the telescopic beam frame and the beam assembly are fixed by limit pins;

[0008] A second hydraulic cylinder is rotatably connected to the first leg assembly, and an output shaft of the second hydraulic cylinder is rotatably connected to the telescopic beam frame, so as to push the telescopic beam frame to move on the beam assembly;

[0009] A second leg assembly is fixedly mounted on the telescopic beam frame for supporting the telescopic beam frame;

[0010] A plurality of electric chain hoists are fixedly mounted on the telescopic beam frame for lifting operations.

[0011] As an optional solution of the technical solution of the document of the present invention, the beam assembly includes a beam body, and the telescopic beam frame is plug-fitted with the beam body;

[0012] The beam body is provided with a plurality of first limiting holes, the telescopic beam frame is provided with a plurality of fourth limiting holes, and limiting pins are inserted into the first limiting holes and the fourth limiting holes to fix the telescopic beam frame and the beam body.

[0013] As an optional solution of the technical solution of the present invention, the first leg assembly includes a leg column, the leg column is hollow inside, a lifting column is inserted and matched in the leg column, a first hydraulic cylinder is fixedly installed on the leg column, the output shaft of the first hydraulic cylinder is fixedly connected to the lifting column, the first hydraulic cylinder is used to drive the lifting column to move on the leg column, and the leg column is rotatably connected to the beam body;

[0014] A plurality of limit frames are fixedly mounted on the beam body, and the support leg columns are fixed to the corresponding limit frames via limit pins.

[0015] As an optional solution of the technical solution of the document of the present invention, a first positioning hole is opened at one end of the support leg column away from the beam body, and a plurality of second positioning holes are opened on the lifting column. The limit pins are inserted into the first positioning hole and the second positioning hole to fix the support leg column and the lifting column.

[0016] As an optional solution of the technical solution of the document of the present invention, the difference between the second leg assembly and the first leg assembly is that the leg column of the second leg assembly is fixedly installed at one end of the telescopic beam frame away from the beam assembly.

[0017] As an optional solution of the technical solution of the document of the present invention, a pad is fixedly installed on the bottom of the second leg assembly.

[0018] As an optional solution of the technical solution of the present invention, it also includes a plurality of adjustment components, each group of electric chain hoists corresponds to an adjustment component;

[0019] The adjustment assembly includes a third hydraulic cylinder, two groups of first fixed beams, two groups of second fixed beams and rollers, the third hydraulic cylinder is fixedly mounted on the beam body, the first fixed beam is fixedly mounted on the beam body, one end of the second fixed beam is fixed on the telescopic beam frame, and the other end is plugged and matched with the first fixed beam;

[0020] The third hydraulic cylinder is used to drive the roller to slide on the first fixed beam or the second fixed beam, and the roller is used to support the sling of the electric chain hoist.

[0021] As an optional solution of the technical solution of the document of the present invention, the first fixed beam and the second fixed beam are hollow inside, the first fixed beam and the second fixed beam are both opened on the same side, the tops of the openings of the first fixed beam and the second fixed beam are flush, and a second support plate is fixedly installed at the opening of the second fixed beam, and the second support plate is flush with the bottom of the opening of the first fixed beam;

[0022] The roller is located between the two sets of second fixed beams, and both ends of the roller are rotatably connected to the limiting block, and the limiting block is provided with a limiting groove, the width of the limiting groove is equal to the sum of the wall thickness of the first fixed beam and the second fixed beam, the open tops of the first fixed beam and the second fixed beam are plugged into the limiting groove, and the bottom of the limiting block is in contact with the second support plate;

[0023] The output shaft of the third hydraulic cylinder is fixedly mounted with a fixing frame, and the two sets of limit blocks are fixedly connected to the fixing frame.

[0024] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0025] 1. The present invention can realize the switching of supporting positions through the arrangement of the first leg assembly and the second leg assembly. When the lifting device performs lifting operations in the tunnel, other equipment needs to pass through the tunnel or the ground rail at the same time. At this time, the cushion block is supported on the ground of the tunnel by extending the telescopic beam frame and the second leg assembly, and the telescopic beam frame and the beam body are limited by the limit pin, and the limit of the leg column and the limit frame on the first leg assembly is cancelled. The first leg assembly drives the driving wheel to rise and leave the ground rail, and the output shaft of the second hydraulic cylinder returns, driving the first leg assembly to rotate to one side of the second leg assembly, thereby increasing the middle space of the lifting equipment and reducing the difficulty of other equipment passing on the ground rail. At the same time, the support spacing of the lifting equipment is increased, further improving the stability of the support.

[0026] 2. The lifting device of the present invention can be folded and contracted in width and height as needed, so as to control the overall size of the lifting equipment, effectively reduce the risk of collision between the lifting device and the tunnel and the equipment and pipelines in the tunnel, reduce the difficulty of traveling in the tunnel, and have high flexibility.

[0027] 3. The present invention installs the electric chain hoist on the telescopic beam frame and passes the sling around the roller. During the lifting operation, the output shaft of the third hydraulic cylinder pushes the fixed frame, the limit block and the roller to move, thereby increasing the range of the lifting device to transport the hanging parts in the width direction of the laneway. The limit groove setting on the limit block effectively guides the movement of the roller and improves the stability of the roller movement.

[0028] 4. The present invention can disassemble the pad and install the driving wheel, by moving the second leg assembly to just above the outer rail, placing the driving wheel installed on the second leg assembly on the outer rail, and lifting the driving wheel on the first leg assembly, thereby realizing the switching of the ground rail. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic diagram of the overall structure of a gantry type lifting device for underground coal mines disclosed in a preferred embodiment of the present invention;

[0030] Figure 2A schematic diagram of the connection structure of a leg assembly and a beam assembly of a gantry type lifting device for underground coal mines disclosed in a preferred embodiment of the present invention;

[0031] Figure 3 A schematic diagram of a gantry type lifting device for underground coal mines supported in a tunnel is disclosed in a preferred embodiment of the present invention;

[0032] Figure 4 A schematic diagram of the structure of a driving wheel portion of a gantry type lifting device for underground coal mines disclosed in a preferred embodiment of the present invention;

[0033] Figure 5 A schematic diagram of the connection structure between the adjustment component and the beam component of a gantry type lifting device for underground coal mines disclosed in a preferred embodiment of the present invention;

[0034] Figure 6 A schematic diagram of the distribution of adjustment components of a gantry-type lifting device for underground coal mines disclosed in a preferred embodiment of the present invention;

[0035] Figure 7 A schematic diagram of the roller installation position of a gantry type lifting device for underground coal mines disclosed in a preferred embodiment of the present invention;

[0036] Figure 8 A schematic structural diagram of a first fixed beam and a second fixed beam of a gantry type lifting device for an underground coal mine disclosed in a preferred embodiment of the present invention;

[0037] Fig. 9 A schematic diagram of a roller connection structure of a gantry type lifting device for underground coal mines disclosed in a preferred embodiment of the present invention;

[0038] Fig.10 The present invention is a schematic diagram of the connection structure between a limit block and a fixed beam of a gantry type lifting device for an underground coal mine disclosed in a preferred embodiment of the present invention.

[0039] Explanation of the numbers in the figure: 1. beam assembly; 2. first leg assembly; 3. driving wheel; 4. telescopic beam frame; 5. second hydraulic cylinder; 6. second leg assembly; 7. pad; 8. chain electric hoist; 9. adjustment assembly; 11. beam body; 12. first limiting hole; 13. limiting frame; 14. second limiting hole; 21. leg column; 22. lifting column; 23. first hydraulic cylinder; 24. connecting seat; 25. third limiting hole; 26. first positioning hole; 27. second positioning hole; 31. driving box; 32. track wheel; 33. driving motor; 34. first sprocket; 35. toothed chain; 41. fourth limiting hole; 42. connecting rod; 91. third hydraulic cylinder; 92. first fixed beam; 93. second fixed beam; 94. roller; 95. first support plate; 96. second support plate; 97. limiting block; 98. limiting groove; 99. fixed frame. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not 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.

[0041] Reference Figures 1 to 3 The present embodiment discloses a gantry type lifting device for coal mines, including a beam assembly 1 and a plurality of first leg assemblies 2. The beam assembly 1 includes a beam main body 11, which is composed of a plurality of main beams and a plurality of cross beams welded and fixed to each other. The main beam of the beam main body 11 is hollow inside, and first limiting holes 12 are provided at both ends of the main beam. A plurality of limiting frames 13 are fixedly installed on the main beam, and a second limiting hole 14 is provided on the limiting frame 13. The plurality of first leg assemblies 2 correspond to the limiting frames 13 in position. The first leg assembly 2 includes a leg column 21, which is hollow inside. A lifting column 22 is plugged in and matched, and a first hydraulic cylinder 23 is fixedly installed on the leg column 21. The output shaft of the first hydraulic cylinder 23 is fixedly connected to the lifting column 22 to drive the lifting column 22 to move in the leg column 21. The leg column 21 is rotatably connected to the main beam of the beam body 11 through a connecting seat 24. A third limiting hole 25 is opened on the leg column 21. When the leg column 21 is perpendicular to the main beam of the beam body 11, the axes of the second limiting hole 14 and the third limiting hole 25 are colinear, and the limiting pin is inserted into the second limiting hole 14 and the third limiting hole 25 to fix the leg column 21 and the limiting frame 13.

[0042] A first positioning hole 26 is formed at one end of the leg column 21 away from the beam body 11, and a plurality of second positioning holes 27 are formed on the lifting column 22. The limit pins are inserted into the first positioning holes 26 and the second positioning holes 27 to fix the leg column 21 and the lifting column 22 in one step, thereby improving the stability of the lifting column 22 and the leg column 21 after lifting and supporting.

[0043] When the output shaft of the first hydraulic cylinder 23 pushes the lifting column 22 to rise and fall in the support leg column 21, the height of the beam assembly 1 can be effectively adjusted, thereby realizing the adjustment of the lifting height. When the lifting equipment is walking in the tunnel of the coal mine, by adjusting the descent of the beam assembly 1, the risk of collision between the beam assembly 1 and the tunnel and the equipment and pipelines in the tunnel can be effectively reduced, thereby reducing the difficulty of walking.

[0044] Reference Figure 2 and Figure 4The bottom of the lifting column 22 is fixedly installed with a driving wheel 3, which includes a driving box 31. The driving box 31 is fixedly installed on the base at the bottom of the lifting column 22 by fastening bolts. A plurality of rail wheels 32 are rotatably connected to the driving box 31. A driving motor 33 is fixedly installed in the driving box 31. The output shaft of the driving motor 33 is fixedly connected with a first sprocket 34. A second sprocket is fixedly installed on the rotating shaft of the rail wheel 32. The first sprocket 34 and the second sprocket are driven by a toothed chain 35. The output shaft of the driving motor 33 drives the first sprocket 34 to rotate, which is driven by the toothed chain 35 to drive the second sprocket and the rail wheel 32 to rotate, so that the rail wheel 32 runs on the ground rail of the lane, thereby realizing the walking of the lifting equipment along the ground rail.

[0045] Reference Figure 1 and Figure 2 Both ends of the beam body 11 are plugged with a telescopic beam frame 4, the telescopic beam frame 4 is composed of two groups of support beams and a plurality of cross beams welded and fixed, the support beam is plugged with the main beam of the beam body 11, and a plurality of fourth limiting holes 41 are opened on the support beam. The limiting pin is inserted into the first limiting hole 12 and the fourth limiting hole 41 to fix the telescopic beam frame 4 and the beam body 11.

[0046] The second hydraulic cylinder 5 is rotatably connected to the leg column 21, and the output shaft of the second hydraulic cylinder 5 is rotatably connected to the support beam of the telescopic beam frame 4. The output shaft of the second hydraulic cylinder 5 pushes the telescopic beam frame 4 to move on the beam body 11, thereby realizing the telescopic control of the telescopic beam frame 4.

[0047] A second leg assembly 6 is fixedly installed on one end of the support beam of the telescopic beam frame 4 away from the beam body 11, and the second leg assembly 6 is located below the telescopic beam frame 4. The second leg assembly 6 has the same structure as the first leg assembly 2. The leg column 21 of the second leg assembly 6 is fixedly installed on the support beam of the telescopic beam frame 4. A connecting rod 42 is arranged below the support beam of the telescopic beam frame 4. One end of the connecting rod 42 is fixedly connected to the support beam, and the other end is fixedly connected to the leg column 21 of the second leg assembly 6. The connecting rod 42 forms a triangular area with the leg column 21 and the support beam, thereby increasing the stability of the second leg assembly 6. A pad 7 is fixedly installed on the bottom of the second leg assembly 6, and a plurality of chain electric hoists 8 are fixedly installed on the telescopic beam frame 4 for lifting operations. The chain electric hoist 8 is an existing lifting equipment, and its structure will not be repeated this time.

[0048] By setting the first leg assembly 2 and the second leg assembly 6, the switching of the support position can be realized. When the lifting device performs lifting operations in the tunnel, other equipment needs to pass through the tunnel at the same time. At this time, by extending the telescopic beam frame 4 and the second leg assembly 6, the pad 7 is supported on the tunnel ground, the telescopic beam frame 4 and the beam body 11 are limited by the limit pin, and the limit of the leg column 21 and the limit frame 13 on the first leg assembly 2 is cancelled. The first leg assembly 2 drives the driving wheel 3 to rise and leave the ground rail, and the output shaft of the second hydraulic cylinder 5 returns, thereby driving the first leg assembly 2 to rotate to one side of the second leg assembly 6, thereby increasing the middle space of the lifting equipment and reducing the difficulty of other equipment passing on the ground rail. At the same time, the support spacing of the lifting equipment is increased, further improving the stability of the support. The lifting device of the present invention can be folded and contracted as needed, thereby controlling the overall size of the lifting equipment, further reducing the difficulty of passing through the tunnel, and greatly improving the flexibility of the lifting equipment.

[0049] A plurality of ground rails are arranged in the coal mine tunnel. For the convenience of description, the ground rails with smaller spacing are called inner rails, and the ground rails with larger spacing are called outer rails. In this embodiment, the pad 7 can be removed and the driving wheel 3 can be installed. By moving the second leg assembly 6 to just above the outer rail and placing the driving wheel 3 installed on the second leg assembly 6 on the outer rail, the driving wheel 3 on the first leg assembly 2 is lifted, thereby realizing the switching of the ground rails and further improving the flexibility of the equipment.

[0050] Reference Figure 1 , Figures 5 to 10 The lifting device also includes a plurality of adjustment components 9, each group of adjustment components 9 corresponds to an electric chain hoist 8, the adjustment component 9 includes a third hydraulic cylinder 91, two groups of first fixed beams 92, two groups of second fixed beams 93 and a roller 94, the third hydraulic cylinder 91 is fixedly mounted on the crossbeam of the beam body 11, one end of the first fixed beam 92 is fixedly mounted on the beam body 11, the first fixed beam 92 and the second fixed beam 93 are hollow inside, one end of the second fixed beam 93 is fixed on the telescopic beam frame 4, and the other end is plugged with the first fixed beam 92, the first fixed beam 92 and the second fixed beam 93 are both opened on the same side, the tops of the openings of the first fixed beam 92 and the second fixed beam 93 are flush, the first fixed beam 92 is welded and fixed with a first support plate 95 at the bottom of the opening and is flush with the bottom of the opening, the second fixed beam 93 is fixedly mounted with a second support plate 96 at the opening, and the upper surfaces of the first support plate 95 and the second support plate 96 are flush.

[0051] The roller 94 is located between the two groups of second fixed beams 93, and the two ends of the roller 94 are rotatably connected to the limiting block 97. The limiting block 97 is provided with a limiting groove 98. The width of the limiting groove 98 is equal to the sum of the wall thickness of the first fixed beam 92 and the second fixed beam 93. The open tops of the first fixed beam 92 and the second fixed beam 93 are plugged into the limiting groove 98. The bottom of the limiting block 97 is in contact with the first support plate 95 and the second support plate 96. The output shaft of the third hydraulic cylinder 91 is fixedly installed with a fixing frame 99. The two groups of limiting blocks 97 are fixedly connected to the fixing frame 99. The sling of the chain electric hoist 8 passes around the roller 94, and the roller 94 is used for supporting the sling of the chain electric hoist 8.

[0052] By installing the chain electric hoist 8 on the telescopic beam 4 and passing the sling around the roller 94, during the lifting operation, the output shaft of the third hydraulic cylinder 91 pushes the fixed frame 99, the limit block 97 and the roller 94 to move, thereby increasing the range of the lifting device to transport the hanging parts in the width direction of the laneway. The limit groove 98 on the limit block 97 is set to effectively guide the movement of the roller 94 and improve the stability of the movement of the roller 94.

[0053] When a gantry-type lifting device for an underground coal mine disclosed in an embodiment of the present invention is in use, the output shaft of the second hydraulic cylinder 5 pushes the telescopic beam frame 4 to move on the beam body 11, so that the second leg assembly 6 is unfolded to a set position in a direction away from the first leg assembly 2, and the second leg assembly 6 is extended to support the pad 7 on the ground of the coal mine tunnel, and the telescopic beam frame 4 and the beam body 11 are fixed by the limit pins, and the limit pins of the leg column 21 and the limit frame 13 are removed, and the first leg assembly 2 drives the driving wheel 3 to rise and leave the ground rail, and the output shaft of the second hydraulic cylinder 5 returns, driving the first leg assembly 2 to rotate, thereby realizing the folding of the first leg assembly 2 of the lifting equipment.

[0054] During lifting operations, the output shaft of the third hydraulic cylinder 91 pushes the fixed frame 99, the limit block 97 and the roller 94 to the appropriate position, and the hook of the chain electric hoist 8 is hooked on the hanging piece. The chain electric hoist 8 reels the sling to control the lifting of the hanging piece. When the hanging piece needs to be moved along the width direction of the laneway, the output shaft of the third hydraulic cylinder 91 on the positive side extends and the chain electric hoist 8 on the positive side continues to reel in the sling, and the output shaft of the third hydraulic cylinder 91 on the reverse side returns synchronously and the chain electric hoist 8 on the reverse side releases the sling, thereby achieving balanced movement.

[0055] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A gantry type lifting device for underground coal mines, characterized in that: It comprises a beam assembly (1) and a plurality of first leg assemblies (2); A plurality of the first leg assemblies (2) are rotatably connected to the beam assembly (1); the first leg assemblies (2) and the beam assembly (1) are fixed via limit pins; and the first leg assemblies (2) are used to adjust the lifting and lowering of the beam assembly (1); A driving wheel (3) is fixedly mounted on the first leg assembly (2), and the driving wheel (3) moves on the ground rail; Both ends of the beam assembly (1) are plugged with telescopic beam frames (4), and the telescopic beam frame (4) and the beam assembly (1) are fixed by means of limit pins; A second hydraulic cylinder (5) is rotatably connected to the first leg assembly (2), and an output shaft of the second hydraulic cylinder (5) is rotatably connected to the telescopic beam frame (4) for pushing the telescopic beam frame (4) to move on the beam assembly (1); A second leg assembly (6) is fixedly mounted on the telescopic beam frame (4) and is used to support the telescopic beam frame (4); A plurality of electric chain hoists (8) are fixedly mounted on the telescopic beam frame (4) for use in lifting operations; It also includes a plurality of adjustment components (9), the adjustment components (9) including a third hydraulic cylinder (91), two groups of first fixed beams (92), two groups of second fixed beams (93) and a roller (94), the third hydraulic cylinder (91) being fixedly mounted on the beam body (11), the first fixed beam (92) being fixedly mounted on the beam body (11), one end of the second fixed beam (93) being fixed on the telescopic beam frame (4), and the other end being plug-fitted with the first fixed beam (92); A second support plate (96) is fixedly mounted at the open portion of the second fixed beam (93); the roller (94) is located between the two sets of second fixed beams (93); both ends of the roller (94) are rotatably connected to a limiting block (97); a limiting groove (98) is provided on the limiting block (97); the open tops of the first fixed beam (92) and the second fixed beam (93) are plugged into the limiting groove (98); and the bottom of the limiting block (97) is in contact with the second support plate (96); The output shaft of the third hydraulic cylinder (91) is fixedly mounted with a fixing frame (99), and the two sets of limit blocks (97) are both fixedly connected to the fixing frame (99).

2. A gantry type lifting device for underground coal mines according to claim 1, characterized in that: The beam assembly (1) comprises a beam body (11), and the telescopic beam frame (4) is plug-fitted to the beam body (11); The beam body (11) is provided with a plurality of first limiting holes (12), the telescopic beam frame (4) is provided with a plurality of fourth limiting holes (41), and limiting pins are inserted into the first limiting holes (12) and the fourth limiting holes (41) to fix the telescopic beam frame (4) and the beam body (11).

3. A gantry type lifting device for underground coal mines according to claim 2, characterized in that: The first leg assembly (2) comprises a leg column (21), the leg column (21) is hollow inside, a lifting column (22) is inserted and matched inside the leg column (21), a first hydraulic cylinder (23) is fixedly mounted on the leg column (21), an output shaft of the first hydraulic cylinder (23) is fixedly connected to the lifting column (22), the first hydraulic cylinder (23) is used to drive the lifting column (22) to move on the leg column (21), and the leg column (21) is rotatably connected to the beam body (11); A plurality of limit frames (13) are fixedly mounted on the beam body (11), and the leg columns (21) are fixed to the corresponding limit frames (13) via limit pins.

4. A gantry type lifting device for underground coal mines according to claim 3, characterized in that: A first positioning hole (26) is formed at one end of the support leg column (21) away from the beam body (11), and a plurality of second positioning holes (27) are formed on the lifting column (22). Limit pins are inserted into the first positioning holes (26) and the second positioning holes (27) to fix the support leg column (21) and the lifting column (22).

5. A gantry type lifting device for underground coal mines according to claim 4, characterized in that: The second leg assembly (6) differs from the first leg assembly (2) only in that the leg column (21) of the second leg assembly (6) is fixedly mounted on an end of the telescopic beam frame (4) away from the beam assembly (1).

6. A gantry type lifting device for underground coal mines according to any one of claims 1 to 5, characterized in that: A cushion block (7) is fixedly mounted on the bottom of the second leg assembly (6).

7. A gantry type lifting device for underground coal mines according to any one of claims 2 to 5, characterized in that: Each set of electric chain hoists (8) corresponds to an adjustment component (9); The third hydraulic cylinder (91) is used to drive the roller (94) to slide on the first fixed beam (92) or the second fixed beam (93), and the roller (94) is used to support the sling of the electric chain hoist (8).

8. The gantry type lifting device for underground coal mine according to claim 7, characterized in that: The first fixed beam (92) and the second fixed beam (93) are hollow inside, and the first fixed beam (92) and the second fixed beam (93) are both provided with openings on the same side, the tops of the openings of the first fixed beam (92) and the second fixed beam (93) are flush, and the second support plate (96) is flush with the bottom of the opening of the first fixed beam (92); The width of the limiting groove (98) is equal to the sum of the wall thicknesses of the first fixed beam (92) and the second fixed beam (93).

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