A central hinge connection structure and repair method for underground mining trucks

Abstract

The invention discloses a central hinge connection structure and repair method for underground mining trucks, and relates to the technical field of mining trucks, including a head, a cargo compartment, a head side ear plate, a cargo compartment side ear plate, a stepped shaft, and a bearing. The invention provides an upper steel sleeve and a lower steel sleeve, realizes that after the head side ear plate and the cargo compartment side ear plate are docked, the stepped shaft is inserted into the connection between the head side ear plate and the cargo compartment side ear plate, the steel sleeve is respectively sleeved on the outer wall of the stepped shaft, and then the shaft end cover is respectively installed and fixed to the top and bottom ends of the stepped shaft by a first bolt, and then the shaft end cover is connected and fixed to the steel sleeve by a second bolt, and then the upper and lower central hinges are adjusted to be coaxial and concentric by a horizontal instrument and a steel plate ruler external device, and then the steel sleeves of the upper and lower central hinges are welded and fixed to the head side ear plate, so as to realize the hinged fixation of the head and the cargo compartment. When performing maintenance, it is only necessary to cut off the steel sleeve by wind welding, and then the upper and lower surfaces of the head side ear plate are polished clean, and then a new steel sleeve is welded again.

Description

Technical Field

[0001] The invention relates to the technical field of mining trucks, in particular to a central hinge connection structure of an underground mining truck and a repair method thereof. Background Art

[0002] In underground production activities, mining trucks are responsible for transporting waste rock or ore. Due to the poor road conditions underground, after 2 to 3 years of operation, the upper and lower middle hinges connecting the front of the mining truck and the cargo compartment will fail, such as bolt breakage, broken threaded holes on the front side ear plates, bearing damage, and wear and tear of the upper and lower middle hinges on the front side ear plates, which will cause the mining truck to fail to operate normally. The upper and lower middle hinges of the original mining truck have the same structure, but the assembly direction is opposite. After the middle hinge fails, since the middle hinge connecting ear plate is an integral part of the vehicle body, Since it is impossible to dismantle and repair it separately, there are two traditional repair methods: Method 1: disassemble the mining truck weighing 21-22 tons from the middle and transport it from the underground to the surface processing workshop for repair by cage. After surfacing welding, the shaft hole of the side ear plate of the front of the train is re-bored with a boring machine. The threaded hole on the side ear plate of the front of the train is drilled and tapped after surfacing welding. Method 2: repair on-site underground. Due to limited underground conditions, the shaft hole of the side ear plate of the front of the train is repaired by manual surfacing welding and electric grinding head. The threaded hole on the side ear plate of the front of the train is also manually surfacing, grinding and re-tapped. In both of the above methods, after the ear plate hole and threaded hole are repaired, the imported original parts (pin shaft, bearing, bolt and end cover) are installed.

[0003] The above two methods of repairing the center hinge have great defects. Method 1, surface workshop repair, can ensure the accuracy and quality of the repair, but it is very expensive to disassemble the 21-22 ton vehicle from the center hinge and transport it to the surface repair shop through the tank cage, and then transport it to the mine for assembly after repair. The transportation between the mine and the surface is difficult, and the repair cost and long-term production loss are estimated to take about 1 month each time, and the cost is as high as about 500,000 yuan. This repair method is extremely unfeasible. Method 2, underground on-site repair, although the repair time is short and the repair cost is low, it is estimated that each repair takes about 5 days and costs about 80,000 yuan, but the manual surfacing and grinding of holes cannot reach the original processing accuracy at all, especially the engine head side cannot be guaranteed at all ( Figure 2 )'s four hanging ear holes are coaxial and concentric. Furthermore, the damaged threaded holes on the front side ear plate are also manually welded, ground and re-tapped, and the shape accuracy and position accuracy of each threaded hole cannot be guaranteed at all. Then the imported original parts (pins, bearings and end covers) are installed, but it can only run for about 4 months before the upper and lower center hinges are damaged again. Summary of the invention

[0004] The purpose of the present invention is to provide a center hinge connection structure and repair method for underground mining trucks in order to solve the problems of high labor intensity, long repair time, high cost and low precision in center hinge repair.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: an underground mining truck central hinge connection structure, comprising a vehicle head, a cargo compartment, a vehicle head side ear plate, a cargo compartment side ear plate, a stepped shaft, and a bearing, wherein the cargo compartment is arranged at one end of the vehicle head, the vehicle head side ear plate is welded and fixed to an end of an outer wall of the vehicle head close to the cargo compartment, the cargo compartment side ear plate is welded and fixed to an end of an outer wall of the cargo compartment close to the vehicle head, the stepped shaft is arranged at a connection between the vehicle head side ear plate and the cargo compartment side ear plate, the bearing is sleeved on the outer wall of the stepped shaft, the bottom and top ends of the stepped shaft are both provided with shaft end covers, the outer wall of the stepped shaft is located at the top and bottom ends of the vehicle head side ear plate and is sleeved with a steel sleeve, the steel sleeve is welded and fixed to the vehicle head side ear plate, a first bolt extending to the inside of the stepped shaft is arranged at the inner top and bottom center positions of the shaft end cover, and a second bolt extending to the inside of the steel sleeve is arranged at the inner top and bottom edge positions of the shaft end cover.

[0006] As a further solution of the present invention: the steel sleeve includes an upper steel sleeve and a lower steel sleeve, the upper steel sleeve is sleeved on the outer wall of the stepped shaft and extends to the top end of the front side ear plate, the outer wall of the upper steel sleeve is welded and fixed to the top end of the front side ear plate, the lower steel sleeve is sleeved on the outer wall of the stepped shaft and extends to the bottom end of the front side ear plate, and the outer wall of the lower steel sleeve is welded and fixed to the bottom end of the front side ear plate.

[0007] As a further solution of the present invention: eight first bolts are provided, wherein four of the first bolts are arranged at equal angles in a circle along the center line of the step shaft at the top end of the step shaft, and the other four of the first bolts are arranged at equal angles in a circle along the center line of the step shaft at the bottom end of the step shaft.

[0008] As a further solution of the present invention: four first thread grooves are arranged at the top of the stepped shaft and inside the shaft end cover located at the top of the stepped shaft, and four first thread grooves are also arranged at the bottom end of the other stepped shaft and inside the shaft end cover located at the top of the other stepped shaft, and the first thread grooves are consistent with the outer wall of the first bolt.

[0009] As a further solution of the present invention: sixteen second bolts are provided, the top end of one shaft end cover is provided with eight second thread grooves penetrating into the interior of the upper steel sleeve, and the bottom end of another shaft end cover is provided with eight second thread grooves penetrating into the interior of the lower steel sleeve, and the inner wall of the second thread groove coincides with the outer wall of the second bolt.

[0010] As a further solution of the present invention: a first connecting hole is provided inside the cargo compartment side ear plate, the inner wall of the bearing is connected to the outer wall of the stepped shaft by an interference fit, and the outer wall of the bearing is connected to the inner wall of the first connecting hole by a process fit.

[0011] As a further solution of the present invention: a second connecting hole is arranged inside the front side ear plate, a first through hole matching the upper outer wall of the stepped shaft is arranged inside the upper steel sleeve, and the bottom outer wall of the upper steel sleeve matches the inner wall of the second connecting hole.

[0012] As a further solution of the present invention: a second through hole matching the outer wall of the lower part of the stepped shaft is arranged inside the lower steel sleeve, and the second connecting hole matches the outer wall of the lower part of the stepped shaft.

[0013] As a further solution of the present invention: two front side ear plates are provided at one end of the front of the vehicle, and two cargo compartment side ear plates are provided at one end of the cargo compartment, and the two front side ear plates and the cargo compartment side ear plates are divided into upper and lower structures to form an upper middle hinge connection structure and a lower middle hinge connection structure.

[0014] A method for repairing a hinge connection structure in an underground mining truck comprises the following steps:

[0015] S1: Use wind welding to cut off the steel sleeves in the upper middle hinge and the lower middle hinge, remove the stepped shaft, the bearing, and the shaft end cover, and then clean the welding points between the upper and lower surfaces of the front side ear plate and the steel sleeve;

[0016] S2: Insert the new stepped shaft into the connection between the front side ear plate and the cargo compartment side ear plate in the upper middle hinge, sleeve the steel sleeves on the outer walls of the stepped shaft, and then fix the shaft end covers to the top and bottom ends of the stepped shaft respectively by the first bolts, and then connect and fix the shaft end covers to the steel sleeves by the second bolts. Similarly, perform the above connection operations on the lower middle hinge:

[0017] S3: At this time, the steel sleeve has not been fixed yet, and the newly replaced upper and lower middle hinge assemblies are free to move in the horizontal position. Then use a level, a steel ruler, a wooden plug and a jack to adjust the entire vehicle so that the upper and lower middle hinges are coaxial and concentric;

[0018] S4: The outer circle of the steel sleeve is fixed to the contact position of the front side ear plate by electric welding to complete the repair process.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. By setting the upper steel sleeve and the lower steel sleeve, the front side ear plate and the cargo compartment side ear plate are connected, and then the stepped shaft is inserted into the connection between the front side ear plate and the cargo compartment side ear plate, and the steel sleeve is respectively sleeved on the outer wall of the stepped shaft, and then the shaft end cover is respectively installed and fixed to the top and bottom ends of the stepped shaft by the first bolt, and then the shaft end cover and the steel sleeve are connected and fixed by the second bolt, and then the upper and lower middle hinges are adjusted to be coaxial and concentric with each other by using a horizontal instrument and a steel plate ruler external device, and then the steel sleeves of the upper and lower middle hinges are welded and fixed to the front side ear plate to realize the hinged fixation of the front and the cargo compartment. When repairing, there is no need to repair the ear plate holes that have become larger due to wear on the front side of the vehicle, nor is there any need to repair the original threaded holes on the ear plate that have been damaged. It is only necessary to cut off the steel sleeve by wind welding, and then the upper and lower surfaces of the front side ear plate are polished clean, and then a new steel sleeve is welded again.

[0021] 2. The repair method of the center hinge of underground mining trucks is simple and easy. There is no need to repair the upper and lower center hinge ear plate holes, nor to repair the damaged threaded holes on the ear plates, and there is no need to transport the mining truck to the surface workshop for repair, but it can ensure the coaxiality and concentricity of the upper and lower center hinges. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of the present invention;

[0023] Figure 2 For the present invention Figure 1 The enlarged schematic diagram at A in the middle;

[0024] Figure 3 This is a schematic diagram of the hinged structure connection before the improvement of the present invention;

[0025] Figure 4 It is a schematic cross-sectional view of the hinged structure connection before improvement of the present invention.

[0026] Figure 5 It is a cross-sectional schematic diagram of the improved hinged structure connection of the present invention.

[0027] Figure 6 For the present invention Figure 5 Enlarged schematic diagram of point B in the middle.

[0028] Figure 7 It is a schematic diagram of the explosion of the connection between the front side ear plate and the cargo compartment side ear plate of the present invention.

[0029] In the figure: 1. locomotive front; 2. cargo compartment; 3. locomotive front side ear plate; 4. cargo compartment side ear plate; 5. stepped shaft; 6. bearing; 7. shaft end cover; 8. first bolt; 9. second bolt; 10. steel sleeve; 1001. upper steel sleeve; 1002. lower steel sleeve. DETAILED DESCRIPTION

[0030] 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.

[0031] See also Figures 1 to 7 In an embodiment of the present invention, a hinge connection structure for an underground mining truck includes a front end 1, a cargo compartment 2, a front side ear plate 3, a cargo compartment side ear plate 4, a stepped shaft 5, and a bearing 6. The cargo compartment 2 is arranged at one end of the front end 1, the front side ear plate 3 is welded and fixed to the outer wall of the front end 1 close to the end of the cargo compartment 2, the cargo compartment side ear plate 4 is welded and fixed to the outer wall of the cargo compartment 2 close to the end of the front end 1, the stepped shaft 5 is arranged at the connection between the front side ear plate 3 and the cargo compartment side ear plate 4, the bearing 6 is sleeved on the outer wall of the stepped shaft 5, the bottom and top ends of the stepped shaft 5 are both provided with shaft end covers 7, the outer wall of the stepped shaft 5 is located at the top and bottom ends of the front side ear plate 3 and is sleeved with a steel sleeve 10, the steel sleeve 10 is welded and fixed to the front side ear plate 3, the inner top and bottom center positions of the shaft end cover 7 are provided with a first bolt 8 extending to the inside of the stepped shaft 5, and the inner top and bottom edge positions of the shaft end cover 7 are provided with a second bolt 9 extending to the inside of the steel sleeve 10.

[0032] In this embodiment: after the front side ear plate 3 is connected with the cargo compartment side ear plate 4, the stepped shaft 5 is inserted into the connection between the front side ear plate 3 and the cargo compartment side ear plate 4, and the steel sleeve 10 is respectively sleeved on the outer wall of the stepped shaft 5, and then the shaft end cover 7 is respectively installed and fixed to the top and bottom ends of the stepped shaft 5 by the first bolt 8, and then the shaft end cover 7 and the steel sleeve 10 are connected and fixed by the second bolt 9, and then the steel sleeve 10 is welded and fixed to the front side ear plate 3 to realize the hinged fixation of the front 1 and the cargo compartment 2. When repairing, there is no need to repair the ear plate hole on the front side that has become larger due to wear, and there is no need to repair the original threaded hole on the ear plate that has been damaged. It is only necessary to cut off the steel sleeve 10 by wind welding, and then the upper and lower surfaces of the front side ear plate 3 are polished clean, and then a new steel sleeve 10 is welded again.

[0033] Please refer to Figure 5 , Figure 6 The steel sleeve 10 includes an upper steel sleeve 1001 and a lower steel sleeve 1002. The upper steel sleeve 1001 is sleeved on the outer wall of the stepped shaft 5 and extends to the top of the front side ear plate 3. The outer wall of the upper steel sleeve 1001 is welded and fixed to the top of the front side ear plate 3. The lower steel sleeve 1002 is sleeved on the outer wall of the stepped shaft 5 and extends to the bottom of the front side ear plate 3. The outer wall of the lower steel sleeve 1002 is welded and fixed to the bottom of the front side ear plate 3.

[0034] In this embodiment: the upper steel sleeve 1001 is sleeved on the outer wall of the stepped shaft 5 and extends to the top of the front side ear plate 3, the outer wall of the upper steel sleeve 1001 is welded and fixed to the top of the front side ear plate 3, the lower steel sleeve 1002 is sleeved on the outer wall of the stepped shaft 5 and extends to the bottom of the front side ear plate 3, the outer wall of the lower steel sleeve 1002 is welded and fixed to the bottom of the front side ear plate 3, thereby realizing the connection and fixation between the outer wall of the stepped shaft 5 and the front side ear plate 3.

[0035] Please refer to Figure 2 , Figure 5 and Figure 6 There are eight first bolts 8, among which four first bolts 8 are arranged at the top of the stepped shaft 5 at equal angles in a ring along the center line of the stepped shaft 5, and the other four first bolts 8 are arranged at the bottom of the stepped shaft 5 at equal angles in a ring along the center line of the stepped shaft 5. Four first thread grooves are arranged at the top of the stepped shaft 5 and at an end cover 7 at the top of the stepped shaft 5, and four first thread grooves are also arranged at the bottom of the other stepped shaft 5 and at the end cover 7 at the top of the other stepped shaft 5, and the first thread grooves are consistent with the outer walls of the first bolts 8.

[0036] In this embodiment: eight first bolts 8 are provided, among which four first bolts 8 are arranged at the top end of the stepped shaft 5 at equal angles in a ring along the center line of the stepped shaft 5, and the other four first bolts 8 are arranged at the bottom end of the stepped shaft 5 at equal angles in a ring along the center line of the stepped shaft 5. Four first thread grooves are arranged at the top end of the stepped shaft 5 and at an end cover 7 located at the top end of the stepped shaft 5, and four first thread grooves are also arranged at the bottom end of the other stepped shaft 5 and at the end cover 7 located at the top end of the other stepped shaft 5. The first thread grooves are consistent with the outer walls of the first bolts 8, so that the stepped shaft 5 and the end cover are connected and fixed using the first bolts 8.

[0037] Please refer to Figure 2 , Figure 5 and Figure 6 There are sixteen second bolts 9, and the top end of one shaft end cover 7 is provided with eight second thread grooves penetrating into the interior of the upper steel sleeve 1001, and the bottom end of the other shaft end cover 7 is provided with eight second thread grooves penetrating into the interior of the lower steel sleeve 1002, and the inner wall of the second thread groove coincides with the outer wall of the second bolt 9.

[0038] In this embodiment: sixteen second bolts 9 are provided, and the top end of one shaft end cover 7 is provided with eight second thread grooves penetrating into the interior of the upper steel sleeve 1001, and the bottom end of the other shaft end cover 7 is provided with eight second thread grooves penetrating into the interior of the lower steel sleeve 1002. The inner wall of the second thread groove coincides with the outer wall of the second bolt 9, so that the two shaft end covers 7 are respectively connected and fixed to the upper steel sleeve 1001 and the lower steel sleeve 1002 using the second bolts 9.

[0039] Please refer to Figure 6 , Figure 7 A first connecting hole is provided inside the cargo compartment side ear plate 4, the inner wall of the bearing 6 is connected to the outer wall of the stepped shaft 5 by an interference fit, and the outer wall of the bearing 6 is connected to the inner wall of the first connecting hole by a process fit.

[0040] In this embodiment: a first connecting hole is provided inside the cargo compartment side ear plate 4, the inner wall of the bearing 6 is connected to the outer wall of the stepped shaft 5 by an interference fit, and the outer wall of the bearing 6 is connected to the inner wall of the first connecting hole by a process fit, so that the bearing 6 and the stepped shaft 5 can rotatably connect the cargo compartment side ear plate 4 and the front side ear plate 3.

[0041] Please refer to Figure 6 , Figure 7 A second connecting hole is arranged inside the front side ear plate 3, a first through hole matching the upper outer wall of the stepped shaft 5 is arranged inside the upper steel sleeve 1001, and the bottom outer wall of the upper steel sleeve 1001 matches the inner wall of the second connecting hole.

[0042] In this embodiment: a second connecting hole is provided inside the front side ear plate 3, a first through hole matching the upper outer wall of the stepped shaft 5 is provided inside the upper steel sleeve 1001, and the bottom outer wall of the upper steel sleeve 1001 matches the inner wall of the second connecting hole, so that the upper steel sleeve 1001 is plugged into the second connecting hole inside the front side ear plate 3, and the stepped shaft 5 is limitedly plugged into the upper steel sleeve 1001.

[0043] Please refer to Figure 5 , Figure 6 and Figure 7 A second through hole matching the outer wall of the lower part of the stepped shaft 5 is provided inside the lower steel sleeve 1002, and the second connecting hole matches the outer wall of the lower part of the stepped shaft 5.

[0044] In this embodiment: a second through hole matching the outer wall of the lower part of the stepped shaft 5 is provided inside the lower steel sleeve 1002, and the second connecting hole matches the outer wall of the lower part of the stepped shaft 5, so that the lower steel sleeve 1002 is sleeved on the outer wall of the stepped shaft 5, and the stepped shaft 5 is limitedly inserted into the interior of the front side ear plate 3.

[0045] Please refer to Figure 1 Two front side ear plates 3 are arranged at one end of the front of the vehicle 1, and two cargo compartment side ear plates 4 are arranged at one end of the cargo compartment 2. The two front side ear plates 3 and the cargo compartment side ear plates 4 are divided into upper and lower structural parts to form an upper middle hinge connection structure and a lower middle hinge connection structure.

[0046] In this embodiment: two front side ear plates 3 are provided at one end of the front of the vehicle 1, and two cargo compartment side ear plates 4 are provided at one end of the cargo compartment 2. The two front side ear plates 3 and the cargo compartment side ear plates 4 are divided into upper and lower structures to form an upper middle hinge connection structure and a lower middle hinge connection structure, so that the front of the vehicle 1 and the cargo compartment 2 are stably hinged and fixed.

[0047] A method for repairing a hinge connection structure in an underground mining truck comprises the following steps:

[0048] S1: Use wind welding to cut off the steel sleeves 10 in the upper middle hinge and the lower middle hinge, remove the stepped shaft 5, the bearing 6, and the shaft end cover 7, and then clean the welding points between the upper and lower surfaces of the front side ear plate 3 and the steel sleeve 10;

[0049] Specifically, when repair is needed, use a wind welding cutter to cut off the four steel sleeves 10 of the upper and lower middle hinges. After cutting off the four steel sleeves 10 of the upper and lower middle hinges from the front side ear plate 3, remove the stepped shaft 5, bearing 6 and shaft end cover 7 in turn. Since the cross-section of the steel sleeve 10 cut by wind welding is not smooth, the upper and lower surfaces and the cut edge of the front side ear plate 3 can be polished clean using grinding equipment.

[0050] S2: Insert the new stepped shaft 5 into the connection between the front side ear plate 3 and the cargo compartment side ear plate 4 in the upper middle hinge, respectively sleeve the steel sleeve 10 on the outer wall of the stepped shaft 5, and then install and fix the shaft end cover 7 on the top and bottom ends of the stepped shaft 5 respectively by the first bolt 8, and then connect and fix the shaft end cover 7 and the steel sleeve 10 by the second bolt 9. Similarly, perform the above connection operation on the lower middle hinge:

[0051] Specifically, the new center hinge assembly in this solution is easy to prepare. The pin shaft, steel sleeve, and pin shaft end cover can be processed in the surface workshop first, and the bearings can be purchased on the market and brought together to the underground mining truck to complete the repair very conveniently.

[0052] S3: At this time, the steel sleeve 10 has not been fixed yet, and the newly replaced upper and lower middle hinge assemblies are free to move in the horizontal position. Then use a level, a steel ruler, a wooden plug and a jack to adjust the entire vehicle so that the upper and lower middle hinges are coaxial and concentric;

[0053] Specifically, since the four newly added steel sleeves 8 of the upper and lower middle hinges and the contact surfaces with the four front side ear plates 3 on the front side of the upper and lower middle hinges have not been fixed at the beginning of assembly, the newly replaced upper and lower middle hinge assemblies can move freely in a horizontal position.

[0054] S4: Use electric welding to fix the outer circle of the steel sleeve 10 and the contact position of the front side ear plate 3 to complete the repair process.

[0055] Specifically, the steel sleeve 10 is welded and fixed on the front side ear plate 3 by using electric welding equipment, and then the welding position is polished and ground by using a grinding gun.

[0056] Since the upper and lower middle hinges of the mining truck have the same structure, but the assembly directions are opposite, after being repaired using the method of the present invention, the force transmission route of the front of the vehicle to the cargo compartment is: the upper ear plate (lower ear plate) on the front side - the upper newly added steel sleeve (the lower newly added steel sleeve) - the upper bolt (the lower bolt) - the upper end cover (the lower newly added end cover) - the upper bolt (the lower bolt) - the upper end of the step shaft (the lower end of the step shaft) - the bearing - the side ear plate of the cargo compartment. Therefore, the step pin of the upper middle hinge is changed from being supported at one end of the original vehicle to being supported at both ends, which makes the structure more reasonable, the support more stable, and the force more uniform. Similarly, the lower middle hinge also uses the structural principle of the present invention.

[0057] What is described above 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 hinge connection structure for an underground mining truck, comprising a vehicle head (1), a cargo compartment (2), a vehicle head side ear plate (3), a cargo compartment side ear plate (4), a stepped shaft (5), and a bearing (6), wherein the cargo compartment (2) is arranged at one end of the vehicle head (1), the vehicle head side ear plate (3) is welded and fixed to an end of the outer wall of the vehicle head (1) close to the cargo compartment (2), the cargo compartment side ear plate (4) is welded and fixed to an end of the outer wall of the cargo compartment (2) close to the vehicle head (1), the stepped shaft (5) is arranged at the connection between the vehicle head side ear plate (3) and the cargo compartment side ear plate (4), and the bearing (6) is sleeved on the outer wall of the stepped shaft (5), characterized in that: The bottom and top ends of the stepped shaft (5) are both provided with shaft end covers (7); the outer wall of the stepped shaft (5) is sleeved with steel sleeves (10) at the top and bottom ends of the front side ear plate (3); the steel sleeve (10) is welded and fixed to the front side ear plate (3); the top and bottom center positions of the shaft end cover (7) are both provided with first bolts (8) extending into the inside of the stepped shaft (5); the top and bottom edge positions of the shaft end cover (7) are both provided with second bolts (9) extending into the inside of the steel sleeve (10); The steel sleeve (10) comprises an upper steel sleeve (1001) and a lower steel sleeve (1002), wherein the upper steel sleeve (1001) is sleeved on the outer wall of the stepped shaft (5) and extends to the top end of the front side ear plate (3), and the outer wall of the upper steel sleeve (1001) is welded and fixed to the top end of the front side ear plate (3), and the lower steel sleeve (1002) is sleeved on the outer wall of the stepped shaft (5) and extends to the bottom end of the front side ear plate (3), and the outer wall of the lower steel sleeve (1002) is welded and fixed to the bottom end of the front side ear plate (3); One end of the vehicle front (1) is provided with two vehicle front side ear plates (3), and one end of the cargo compartment (2) is provided with two cargo compartment side ear plates (4). The two vehicle front side ear plates (3) and the cargo compartment side ear plates (4) are divided into upper and lower structural parts to form an upper middle hinge connection structure and a lower middle hinge connection structure.

2. The hinge connection structure for underground mining trucks according to claim 1, characterized in that: Eight first bolts (8) are provided, of which four first bolts (8) are arranged at equal angles in a ring shape along the center line of the stepped shaft (5) at the top end of the stepped shaft (5), and another four first bolts (8) are arranged at equal angles in a ring shape along the center line of the stepped shaft (5) at the bottom end of the stepped shaft (5).

3. The central hinge connection structure for an underground mining truck according to claim 2, characterized in that: Four first thread grooves are arranged at the top end of the stepped shaft (5) and inside the shaft end cover (7) located at the top end of the stepped shaft (5), and four first thread grooves are also arranged at the bottom end of the other stepped shaft (5) and inside the shaft end cover (7) located at the top end of the other stepped shaft (5), and the first thread grooves are matched with the outer wall of the first bolt (8).

4. The central hinge connection structure for an underground mining truck according to claim 1, characterized in that: Sixteen second bolts (9) are provided, and the top end of one shaft end cover (7) is provided with eight second thread grooves penetrating into the interior of the upper steel sleeve (1001), and the bottom end of another shaft end cover (7) is provided with eight second thread grooves penetrating into the interior of the lower steel sleeve (1002), and the inner wall of the second thread groove matches the outer wall of the second bolt (9).

5. The hinge connection structure for underground mining trucks according to claim 1, characterized in that: A first connecting hole is provided inside the cargo compartment side ear plate (4), the inner wall of the bearing (6) is connected to the outer wall of the stepped shaft (5) by an interference fit, and the outer wall of the bearing (6) is connected to the inner wall of the first connecting hole by a process fit.

6. The hinge connection structure for underground mining trucks according to claim 2, characterized in that: A second connection hole is provided inside the front side ear plate (3), a first through hole matching the upper outer wall of the stepped shaft (5) is provided inside the upper steel sleeve (1001), and the bottom outer wall of the upper steel sleeve (1001) matches the inner wall of the second connection hole.

7. The hinge connection structure for underground mining trucks according to claim 6, characterized in that: A second through hole matching the outer wall of the lower portion of the stepped shaft (5) is provided inside the lower steel sleeve (1002), and the second connecting hole matches the outer wall of the lower portion of the stepped shaft (5).

8. A method for repairing a hinge connection structure of an underground mining truck, characterized in that: The invention uses a central hinge connection structure for an underground mining truck according to any one of claims 1 to 7, comprising the following steps: S1: using wind welding to cut off the steel sleeves (10) in the upper middle hinge and the lower middle hinge, removing the stepped shaft (5), the bearing (6), and the shaft end cover (7), and then grinding clean the welding points between the upper surface and the lower surface of the front side ear plate (3) and the steel sleeve (10); S2: Insert the new stepped shaft (5) into the connection between the front side ear plate (3) and the cargo compartment side ear plate (4) in the upper middle hinge, sleeve the steel sleeve (10) on the outer wall of the stepped shaft (5), and then install and fix the shaft end cover (7) on the top and bottom ends of the stepped shaft (5) respectively by the first bolt (8), and then connect and fix the shaft end cover (7) and the steel sleeve (10) by the second bolt (9). Similarly, perform the above connection operation on the lower middle hinge: S3: At this time, the steel sleeve (10) has not been fixed yet, and the newly replaced upper and lower middle hinge assemblies are free to move in the horizontal position. Then, the whole vehicle is adjusted to make the upper and lower middle hinges coaxial and cocentric using a level, a steel ruler, a wooden plug and a jack; S4: The outer circle of the steel sleeve (10) is fixed to the contact position of the front side ear plate (3) by electric welding, thereby completing the repair process.

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