Movable hydraulic small crane for underground operation of coal mine

Abstract

The invention relates to the technical field of underground equipment, in particular to a movable hydraulic small crane for coal mine underground operation, which comprises a hoisting mechanism, supporting mechanisms and positioning mechanisms, the supporting mechanisms are fixedly arranged at the front end and the rear end of the hoisting mechanism, and the positioning mechanisms are fixedly arranged at the front end and the rear end of the hoisting mechanism. The ground feet move downwards to be in contact with the ground through rotation of the sliding shafts, so that the small crane is supported, the hoisting stability is guaranteed, after the bottoms of a part of the ground feet are in contact with the ground, due to the fact that the ground feet in contact with the ground cannot move downwards, the corresponding gears stop rotating, vortex strips in the gears can be compressed when the sliding shafts continue to rotate, and therefore the small crane can be stably hoisted. And the rest gears still continue to rotate under the connecting action of the clamping grooves and the vortex strips, the rest adjusting rods and the ground feet are driven to move downwards till the bottoms of the four ground feet make contact with the ground, the height positions of the four ground feet are adjusted at the same time, the time needed by adjustment is greatly shortened, and the lifting efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of underground equipment, in particular to a small movable hydraulic crane for underground coal mine operations. Background Art

[0002] Underground coal mining involves digging a series of shafts and tunnels from the ground to the underground. The entire production process is carried out underground, and various operating equipment needs to be transported to the underground tunnels for installation and use. After arriving underground, the equipment needs to be lifted, moved, installed, and repaired using tools such as underground cranes.

[0003] According to a Chinese patent application with publication number 202411609469.5, a lifting device for coalfield logging equipment is disclosed. The driving motor drives the driving gear to rotate forward through the rotating rod, so that the driving gear drives the first rack to move downward. At this time, the second rack on the other side moves upward, and the flexible clamp in the limiter clamps the logging instrument, which improves the stability of the logging instrument. Conversely, when the first rack moves upward and the second rack moves downward, the second rack drives the positioning pin to move downward and insert into the soil layer for fixation, so that the device has better stability during operation. However, the bottom of the lifting device is supported only by four universal wheels. When used on some uneven ground, it is difficult to ensure that the bottoms of the four universal wheels are in contact with the ground, which greatly affects the stability of the lifting device, resulting in unsafe lifting of goods and prone to danger. To this end, we propose a movable hydraulic crane for underground coal mine operations to solve the above-mentioned technical problems. Summary of the Invention

[0004] The present invention provides the following technical solution: a small movable hydraulic crane for underground coal mine operations, comprising:

[0005] Lifting mechanism, used for lifting items underground;

[0006] The supporting mechanism is fixedly arranged at the front and rear ends of the lifting mechanism and is used to support the lifting mechanism;

[0007] The positioning mechanism is fixedly arranged at the front end and the rear end of the lifting mechanism and is used for positioning the supporting mechanism.

[0008] As a preferred solution of the present invention, the lifting mechanism includes:

[0009] The lifting chassis is assembled by welding square tubes;

[0010] The articulated seat is fixedly installed in the middle of the top of the lifting chassis;

[0011] The lifting arm is hinged inside the hinged seat;

[0012] The hydraulic jack is fixedly installed at the bottom of the lifting arm away from the hinged seat;

[0013] Suspension cable, fixedly installed on the bottom of the hydraulic jack;

[0014] The hook is fixedly installed at the bottom of the suspension cable.

[0015] As a preferred solution of the present invention, the support mechanism includes:

[0016] The shell is fixedly mounted on both ends of the front and rear of the lifting chassis;

[0017] A sliding shaft, slidably mounted inside the left and right shells;

[0018] A gear is slidably mounted on the periphery of the sliding shaft and rotatably mounted inside the housing;

[0019] The circular cavity is opened inside the gear;

[0020] A card slot is provided on the outer wall of the sliding shaft;

[0021] The vortex bar is fixedly installed in the circular cavity, and the end portion is slidably installed in the slot;

[0022] An adjusting rod is vertically slidably mounted inside the housing;

[0023] Teeth are arranged on the outer wall of the adjusting rod at equal distances above and below, and the teeth are engaged with the gear.

[0024] As a preferred solution of the present invention, the support mechanism further includes:

[0025] The key sleeve is slidably mounted on the left end of the outer wall of the sliding shaft;

[0026] The key block is fixedly mounted on the left end of the outer wall of the sliding shaft at equal angles and is slidably connected to the key groove on the inner wall of the key sleeve;

[0027] The driven bevel gear is fixedly mounted on the outer wall of the key sleeve;

[0028] The central shaft is installed at the left end of the lifting chassis for front and rear distribution rotation;

[0029] A driving bevel gear is fixedly mounted on one end of the intermediate shaft, and the driving bevel gear is meshed with the driven bevel gear;

[0030] The double-sided reduction motor is fixedly installed on the top left end of the lifting chassis and is located between the front and rear rotating shafts;

[0031] The transmission shaft is connected between the output end of the bilateral reduction motor and the end of the intermediate shaft away from the driving bevel gear through a universal coupling.

[0032] As a preferred solution of the present invention, the support mechanism further includes

[0033] The fixed plate is fixedly mounted on the left end of the lifting chassis. The sliding shaft and the key sleeve pass through the interior of the fixed plate, and the key sleeve is rotatably connected to the fixed plate through a bearing.

[0034] As a preferred solution of the present invention, the positioning mechanism includes:

[0035] The hydraulic cylinder is fixed on the front and rear of the lifting chassis through fixed brackets;

[0036] The push-pull block is fixedly mounted on the output rods of the front and rear hydraulic cylinders and is rotatably mounted on the outer wall of the sliding shaft through a plane bearing;

[0037] The first side gear plate is fixedly mounted on the outer wall of the sliding shaft and is located on one side of the housing;

[0038] The second side sprocket is fixedly mounted on the side of the housing close to the first side sprocket. The second side sprocket is opposite to the first side sprocket and has a 1 cm gap between it and the first side sprocket.

[0039] The third side chainring is fixedly mounted on the side of the gear close to the second side chainring;

[0040] The No. 4 side sprocket is fixedly mounted on the outer wall of the sliding shaft and is located on the side of the No. 3 side sprocket away from the gear. The teeth of the No. 3 side sprocket are opposite to those of the No. 2 side sprocket, and a 1 cm gap is provided between the No. 3 side sprocket and the No. 2 side sprocket.

[0041] As a preferred solution of the present invention, the left and right widths of the slot are greater than the left and right widths of the vortex strip, and the gap between the left inner wall of the slot and the left side surface of the vortex strip is 1 cm.

[0042] As a preferred solution of the present invention, a foot is fixedly installed on the bottom of the adjusting rod.

[0043] As a preferred solution of the present invention, the lifting mechanism further includes:

[0044] Angle plates are fixedly installed at both ends of the front and rear of the lifting chassis;

[0045] The universal wheel is fixed to the bottom of the angle plate by bolts.

[0046] As a preferred solution of the present invention, the lifting mechanism further includes:

[0047] The push handle is fixedly installed on the top left end of the lifting chassis.

[0048] Compared with the prior art, the present invention has the following beneficial effects:

[0049] 1. In the present invention, the sliding shaft rotates to make the feet move downward and contact the ground, forming support for the small crane and ensuring the stability of lifting. After the bottom of a part of the feet contacts the ground, the feet in contact with the ground cannot move downward, so the corresponding gear stops rotating, and the sliding shaft compresses the vortex strips inside the gear when it continues to rotate, while the remaining part of the gear continues to rotate under the connection between the slot and the vortex strips, driving the remaining adjusting rods together with the feet to move downward until the bottoms of the four feet are in contact with the ground, thereby realizing the adjustment of the height positions of the four feet together, greatly reducing the time required for adjustment and improving the lifting efficiency.

[0050] 2. In the present invention, the output rods of the front and rear hydraulic cylinders are retracted, and the front and rear push blocks are driven to move together, pushing the front and rear slide shafts to slide to the right. The movement of the slide shaft drives the No. 1 side sprocket and the No. 4 side sprocket to move together, so that the No. 1 side sprocket is engaged with the No. 2 side sprocket, and the No. 4 side sprocket is engaged with the No. 3 side sprocket. In this way, the rotation locking of the slide shaft and the gear is achieved, resulting in the gear being unable to rotate. Therefore, the position of the adjusting rod is also locked, thereby supporting the entire lifting mechanism, ensuring the stability of the lifting, and reducing operating losses. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 This is a schematic diagram of the structure of the present invention from a right front perspective;

[0052] Figure 2 This is a schematic diagram of the structure of the present invention from a left front perspective;

[0053] Figure 3 For the present invention Figure 2 A schematic diagram of the enlarged structure of part A;

[0054] Figure 4 It is a structural schematic diagram of the lifting chassis in the present invention;

[0055] Figure 5 For the present invention Figure 4 Schematic diagram of the enlarged structure of part B;

[0056] Figure 6 Schematic diagram of the top cross-section structure of the shell in the present invention;

[0057] Figure 7 For the present invention Figure 6 Schematic diagram of the enlarged structure of part C;

[0058] Figure 8 Schematic diagram of the internal structure of the gear in the present invention.

[0059] In the figure: 100, lifting mechanism; 101, lifting chassis; 102, articulated seat; 103, lifting arm; 104, hydraulic jack; 105, suspension cable; 106, hook; 107, angle plate; 108, universal wheel; 109, push handle; 200, supporting mechanism; 201, housing; 202, sliding shaft; 203, gear; 204, circular cavity; 205, slot; 206, vortex strip; 207, adjusting rod; 2071, foot ; 208, teeth; 209, key sleeve; 2010, key block; 2011, driven bevel gear; 2012, transfer shaft; 2013, driving bevel gear; 2014, bilateral reduction motor; 2015, transmission shaft; 2016, fixed plate; 300, positioning mechanism; 301, hydraulic cylinder; 302, push block; 303, side gear disc No. 1; 304, side gear disc No. 2; 305, side gear disc No. 3; 306, side gear disc No. 4. DETAILED DESCRIPTION

[0060] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making creative efforts are within the scope of protection of the present invention.

[0061] See also Figures 1 to 8 The technical solution provided by the present invention specifically includes the following embodiments:

[0062] A movable hydraulic crane for underground coal mine operations includes a lifting mechanism 100, a supporting mechanism 200 and a positioning mechanism 300. The lifting mechanism 100 is used to lift objects underground. The supporting mechanism 200 is fixedly arranged at the front and rear ends of the lifting mechanism 100 and is used to support the lifting mechanism 100. The positioning mechanism 300 is fixedly arranged at the front and rear ends of the lifting mechanism 100 and is used to position the supporting mechanism 200.

[0063] For further details, please refer to Figure 2 As shown:

[0064] The lifting mechanism 100 includes a lifting chassis 101, an articulated seat 102, a lifting arm 103, a hydraulic jack 104, a suspension cable 105, a hook 106, a corner plate 107, a universal wheel 108 and a push handle 109. The lifting chassis 101 is assembled by welding square tubes. The articulated seat 102 is fixedly installed in the middle of the top of the lifting chassis 101. The lifting arm 103 is hinged inside the articulated seat 102. The hydraulic jack 104 is fixedly installed at the bottom of the end of the lifting arm 103 away from the articulated seat 102. The suspension cable 105 is fixedly installed at the bottom of the hydraulic jack 104. The hook 106 is fixedly installed at the bottom of the suspension cable 105. The corner plate 107 is fixedly installed at the front and rear ends of the lifting chassis 101. The universal wheel 108 is fixedly installed at the bottom of the corner plate 107 by bolts. The push handle 109 is fixedly installed at the top left end of the lifting chassis 101.

[0065] Specifically, the miner holds the handle on the push handle 109 to push the small crane to the underground working position. At the same time, the four universal wheels 108 set at the bottom of the small crane can make the small crane move more convenient. After moving the small crane to the working position, use the hook 106 to hook the top of the hoisted object, extend the output rod of the hydraulic jack 104, and flip the lifting arm 103 upward along the hinge with the hinge seat 102, and then lift the suspension cable 105, hook 106 and the hooked object upward.

[0066] For further details, please refer to Figures 3 to 8 As shown:

[0067] The supporting mechanism 200 includes a housing 201, a sliding shaft 202, a gear 203, a circular cavity 204, a slot 205, a vortex bar 206, an adjusting rod 207, teeth 208, a key sleeve 209, a key block 2010, a driven bevel gear 2011, a rotating shaft 2012, an active bevel gear 2013, a bilateral reduction motor 2014, a transmission shaft 2015 and a fixing plate 2016. The housing 201 is fixedly mounted on the front and rear ends of the lifting chassis 101, the sliding shaft 202 is slidably mounted inside the left and right housings 201, and the gear 203 is slidably mounted on the sliding shaft. The outer periphery of the shaft 202 is rotatably mounted inside the housing 201, the circular cavity 204 is opened inside the gear 203, the slot 205 is opened on the outer wall of the sliding shaft 202, the vortex strip 206 is fixedly mounted inside the circular cavity 204, and the end is slidably mounted inside the slot 205, the left and right widths of the slot 205 are greater than the left and right widths of the vortex strip 206, the gap between the left inner wall of the slot 205 and the left side of the vortex strip 206 is 1 cm, the adjustment rod 207 is vertically slidably mounted inside the housing 201, and the bottom of the adjustment rod 207 is fixedly mounted with a foot 2071. The teeth 208 are equidistantly arranged on the outer wall of the adjusting rod 207, and the teeth 208 are meshed with the gear 203. The key sleeve 209 is slidably mounted on the left end of the outer wall of the sliding shaft 202. The key block 2010 is fixedly mounted on the left end of the outer wall of the sliding shaft 202 at equal angles and is slidably connected to the keyway on the inner wall of the key sleeve 209. The driven bevel gear 2011 is fixedly mounted on the outer wall of the key sleeve 209. The rotating shaft 2012 is rotatably mounted on the left end of the lifting chassis 101. The driving bevel gear 2013 is fixedly mounted on one end of the rotating shaft 2012. The driving bevel gear 2013 is fixedly mounted on one end of the rotating shaft 2012. 13 is engaged with the driven bevel gear 2011, the bilateral reduction motor 2014 is fixedly installed at the top left end of the lifting chassis 101, and is located between the front and rear rotating shafts 2012, the transmission shaft 2015 is connected between the output end of the bilateral reduction motor 2014 and the end of the rotating shaft 2012 away from the active bevel gear 2013 through a universal joint, the fixed plate 2016 is fixedly installed at the left end of the lifting chassis 101, the sliding shaft 202 and the key sleeve 209 pass through the interior of the fixed plate 2016, and the key sleeve 209 is rotatably connected to the fixed plate 2016 through the bearing.

[0068] Specifically, the output end of the bilateral reduction motor 2014 drives the front and rear two transmission shafts 2015 to rotate, thereby driving the front and rear two intermediate shafts 2012 and the front and rear two active bevel gears 2013 to rotate together, causing the two driven bevel gears 2011 meshing with the two active bevel gears 2013 to rotate, and driving the front and rear two key sleeves 209 to rotate. Since the key sleeve 209 is slidably connected to the key block 2010 through the key groove on the inner wall, the rotation of the key sleeve 209 drives the sliding shaft 202 to rotate together, and the rotation of the sliding shaft 202 drives the gear 203 to rotate under the connection between the card slot 205 and the vortex bar 206. Since the gear 203 is meshed with the teeth 208, the rotation of the gear 203 drives the adjusting rod 207 downward as a whole, and the adjusting rod 207 moves downward, driving the foot 2071 to move together until it is The bottom of the foot 2071 is in contact with the ground underground. If the ground on which the small crane is located is not flat enough, the four foots 2071 cannot be guaranteed to be in contact with the ground at the same time. Therefore, when the bottom of one part of the foot 2071 is in contact with the ground, the sliding shaft 202 continues to rotate. The foot 2071 in contact with the ground cannot move downward, so the corresponding gear 203 stops rotating. When the sliding shaft 202 continues to rotate, it will compress the vortex bar 206 inside the gear 203, and the remaining part of the gear 203 continues to rotate under the connection between the slot 205 and the vortex bar 206, driving the remaining adjusting rod 207 together with the foot 2071 to move downward until the bottom of the four foot 2071 is in contact with the ground, and the height positions of the four foot 2071 are adjusted together, which greatly reduces the time required for adjustment and improves the lifting efficiency.

[0069] For further details, please refer to Figure 6 、 Figure 7 As shown:

[0070] The positioning mechanism 300 includes a hydraulic cylinder 301, a push block 302, a No. 1 side gear disc 303, a No. 2 side gear disc 304, a No. 3 side gear disc 305 and a No. 4 side gear disc 306. The hydraulic cylinder 301 is fixedly mounted on the front and rear of the lifting chassis 101 through a fixed bracket. The push block 302 is fixedly mounted on the output rods of the front and rear hydraulic cylinders 301 and is rotatably mounted on the outer wall of the sliding shaft 202 through a plane bearing. The No. 1 side gear disc 303 is fixedly mounted on the outer wall of the sliding shaft 202 and is located on one side of the housing 201. The No. 2 side gear disc 304 is fixedly mounted on the outer wall of the sliding shaft 202. On the side of the housing 201 close to the No. 1 side sprocket 303, the No. 2 side sprocket 304 is opposite to the No. 1 side sprocket 303 in tooth direction, and a 1 cm gap is set between the No. 1 side sprocket 303 and the No. 3 side sprocket 305. The No. 3 side sprocket 305 is fixedly mounted on a side of the gear 203 close to the No. 2 side sprocket 304. The No. 4 side sprocket 306 is fixedly mounted on the outer wall of the sliding shaft 202 and is located on the side of the No. 3 side sprocket 305 away from the gear 203. The No. 3 side sprocket 305 is opposite to the No. 2 side sprocket 304 in tooth direction, and a 1 cm gap is set between the No. 3 side sprocket 305 and the No. 2 side sprocket 304.

[0071] Specifically, after the height adjustment of the four feet 2071 is completed, the output rods of the front and rear hydraulic cylinders 301 are retracted, and the front and rear push blocks 302 are driven to move together, pushing the front and rear sliding shafts 202 to slide to the right. The movement of the sliding shaft 202 drives the No. 1 side gear plate 303 and the No. 4 side gear plate 306 to move together, so that the No. 1 side gear plate 303 is engaged with the No. 2 side gear plate 304, and the No. 4 side gear plate 306 is engaged with the No. 3 side gear plate 305. In this way, the rotation locking of the sliding shaft 202 and the gear 203 is achieved, causing the gear 203 to be unable to rotate. Therefore, the position of the adjusting rod 207 is also locked, thereby supporting the lifting mechanism 100 as a whole, ensuring the stability of the lifting, and reducing operational losses.

[0072] This scheme is a mobile hydraulic crane for underground coal mine operations. When working, the miner pushes the crane to the underground operation position by holding the handle on the push handle 109. At the same time, the four universal wheels 108 provided at the bottom of the crane can make the crane move more conveniently. After the crane is moved to the operation position, the hook 106 is used to hook the top of the object to be lifted. The output rod of the hydraulic jack 104 is extended to turn the lifting arm 103 upward along the hinged portion with the hinged seat 102, and then the suspension cable 105, the hook 106 and the hooked object are lifted upward.

[0073] If the ground levelness of the small crane is not good enough, the miner starts the bilateral reduction motor 2014, and drives the front and rear two transmission shafts 2015 to rotate through the output end of the bilateral reduction motor 2014, thereby driving the front and rear two intermediate shafts 2012 and the front and rear two active bevel gears 2013 to rotate together, causing the two driven bevel gears 2011 meshing with the two active bevel gears 2013 to rotate, and driving the front and rear two key sleeves 209 to rotate. Since the key sleeve 209 is slidably connected to the key block 2010 through the keyway on the inner wall, the rotation of the key sleeve 209 drives the sliding shaft 202 to rotate together, and the rotation of the sliding shaft 202 drives the gear 203 to rotate under the connection between the card slot 205 and the vortex bar 206. Since the gear 203 is meshed with the teeth 208, the rotation of the gear 203 will turn the adjusting rod 207 as a whole. When the gear 203 is in contact with the ground, the sliding shaft 202 will continue to rotate, and the ground pin 2071 in contact with the ground will not be able to move downward. As a result, the corresponding gear 203 will stop rotating. When the sliding shaft 202 continues to rotate, it will compress the vortex bar 206 inside the gear 203, and the remaining gear 203 will continue to rotate under the connection between the slot 205 and the vortex bar 206, driving the remaining teeth 208, the adjusting rod 207 and the ground pin 2071 to move downward until the bottoms of the four ground pins 2071 are in contact with the ground.

[0074] Subsequently, the front and rear hydraulic cylinders 301 are started, and the output rods of the front and rear hydraulic cylinders 301 are retracted, driving the front and rear push blocks 302 to move together, pushing the front and rear sliding shafts 202 to slide to the right. The movement of the sliding shaft 202 drives the No. 1 side sprocket 303 and the No. 4 side sprocket 306 to move together, so that the No. 1 side sprocket 303 is engaged with the No. 2 side sprocket 304, and the No. 4 side sprocket 306 is engaged with the No. 3 side sprocket 305. In this way, the rotation locking of the sliding shaft 202 and the gear 203 is achieved, causing the gear 203 to be unable to rotate. Therefore, the position of the adjusting rod 207 is also locked, thereby supporting the lifting mechanism 100 as a whole, ensuring the stability of the lifting, and reducing operational losses.

[0075] While the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations can be made to the embodiments without departing from the principles and spirit of the invention.

Claims

1. A small movable hydraulic crane for underground coal mine operation, characterized by: include: A lifting mechanism (100) is used for lifting objects underground; A support mechanism (200) is fixedly arranged at the front and rear ends of the lifting mechanism (100) and is used to support the lifting mechanism (100); The positioning mechanism (300) is fixedly arranged at the front end and the rear end of the lifting mechanism (100) and is used for positioning the supporting mechanism (200).

2. The movable hydraulic crane for underground coal mine operation according to claim 1, characterized in that: The lifting mechanism (100) comprises: The lifting chassis (101) is assembled by welding square tubes; An articulated seat (102) is fixedly mounted in the middle of the top of the lifting chassis (101); A lifting arm (103) is hinged inside the hinge seat (102); A hydraulic jack (104) is fixedly mounted on the bottom of one end of the lifting arm (103) away from the hinged seat (102); A suspension cable (105) is fixedly mounted on the bottom of the hydraulic jack (104); A hook (106) is fixedly mounted on the bottom of the suspension cable (105).

3. The movable hydraulic crane for underground coal mine operation according to claim 2, characterized in that: The support mechanism (200) comprises: The housing (201) is fixedly mounted on both front ends and both rear ends of the lifting chassis (101); A sliding shaft (202) is slidably mounted inside the left and right housings (201); A gear (203) is slidably mounted on the periphery of the sliding shaft (202) and rotatably mounted inside the housing (201); A circular cavity (204) is provided inside the gear (203); A slot (205) is provided on the outer wall of the sliding shaft (202); The vortex bar (206) is fixedly mounted inside the circular cavity (204), and the end portion is slidably mounted inside the slot (205); An adjusting rod (207) is vertically slidably mounted inside the housing (201); Teeth (208) are provided on the outer wall of the regulating rod (207) at equal distances above and below, and the teeth (208) are engaged with the gear (203).

4. The movable hydraulic crane for underground coal mine operation according to claim 3, characterized in that: The support mechanism (200) further includes: The key sleeve (209) is slidably mounted on the left end of the outer wall of the sliding shaft (202); The key block (210) is fixedly mounted at an equal angle on the left end of the outer wall of the sliding shaft (202) and is slidably connected to the key groove of the inner wall of the key sleeve (209); A driven bevel gear (2011) is fixedly mounted on the outer wall of the key sleeve (209); A central rotating shaft (2012) is rotatably mounted on the left end of the lifting chassis (101) in a front-to-rear distribution; A driving bevel gear (2013) is fixedly mounted on one end of the intermediate shaft (2012), wherein the driving bevel gear (2013) is meshed with the driven bevel gear (2011); A double-sided reduction motor (2014) is fixedly mounted on the top left end of the lifting chassis (101) and is located between the front and rear rotating shafts (2012); The transmission shaft (2015) is connected between the output end of the bilateral reduction motor (2014) and the end of the intermediate shaft (2012) away from the driving bevel gear (2013) through a universal coupling.

5. The movable hydraulic crane for underground coal mine operation according to claim 4, characterized in that: The support mechanism (200) further includes The fixed plate (2016) is fixedly mounted on the left end of the lifting chassis (101); the sliding shaft (202) and the key sleeve (209) pass through the interior of the fixed plate (2016); and the key sleeve (209) is rotatably connected to the fixed plate (2016) via a bearing.

6. The movable hydraulic crane for underground coal mine operation according to claim 5, characterized in that: The positioning mechanism (300) comprises: The hydraulic cylinder (301) is fixedly mounted on the front and rear of the lifting chassis (101) via a fixing bracket; The push-pull block (302) is fixedly mounted on the output rods of the front and rear hydraulic cylinders (301) and is rotatably mounted on the outer wall of the sliding shaft (202) via a plane bearing; A first side gear wheel (303) is fixedly mounted on the outer wall of the sliding shaft (202) and is located on one side of the housing (201); The second side toothed disc (304) is fixedly mounted on a side of the housing (201) close to the first side toothed disc (303), wherein the second side toothed disc (304) is opposite to the first side toothed disc (303) in terms of teeth and a gap of 1 cm is provided between the second side toothed disc (304) and the first side toothed disc (303); The third side gear disc (305) is fixedly mounted on a side of the gear (203) close to the second side gear disc (304); The fourth side toothed disc (306) is fixedly mounted on the outer wall of the sliding shaft (202) and is located on the side of the third side toothed disc (305) away from the gear (203). The teeth of the third side toothed disc (305) and the second side toothed disc (304) are opposite to each other, and a gap of 1 cm is provided between the third side toothed disc (305) and the second side toothed disc (304).

7. The movable hydraulic crane for underground coal mine operation according to claim 6, characterized in that: The left-right width of the slot (205) is greater than the left-right width of the vortex strip (206), and the gap between the left inner wall of the slot (205) and the left side surface of the vortex strip (206) is 1 cm.

8. The movable hydraulic crane for underground coal mine operation according to claim 7, characterized in that: A foot (2071) is fixedly mounted on the bottom of the adjusting rod (207).

9. The movable hydraulic crane for underground coal mine operation according to claim 8, characterized in that: The lifting mechanism (100) further comprises: Angle plates (107) are fixedly mounted on both ends of the front portion and the rear portion of the lifting chassis (101); Universal wheel (108) is fixedly mounted on the bottom of angle plate (107) by bolts.

10. The movable hydraulic crane for underground coal mine operation according to claim 9, characterized in that: The lifting mechanism (100) further comprises: The push handle (109) is fixedly mounted on the top left end of the lifting chassis (101).

Images