Mining vehicle and cargo box lifting mechanism thereof

Abstract

The application discloses a mine vehicle and a cargo box lifting mechanism thereof, and belongs to the technical field of mine vehicles. The cargo box lifting mechanism comprises a vehicle frame, a cargo box, a hydraulic oil cylinder and an oil cylinder support. The cargo box is arranged on the vehicle frame. The cargo box comprises a first hinge part and a second hinge part. The cargo box is connected with the vehicle frame through the first hinge mechanism to rotate and switch between a carrying state and a discharging state relative to the vehicle frame. The oil cylinder support is fixedly arranged on the vehicle frame. The upper part of the oil cylinder support is welded and fixed with the vehicle frame through a first welding position and a second welding position. One end of the hydraulic oil cylinder is connected with the second hinge part of the cargo box through a second hinge mechanism. The other end of the hydraulic oil cylinder is connected with the third hinge part of the lower part of the oil cylinder support through a third hinge mechanism. Through the structural optimization of the cargo box lifting mechanism, the stability of the chassis and the cargo box during lifting can be effectively improved, and good technical support for effectively improving the carrying capacity of the whole vehicle is provided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicles, in particular to a mine vehicle and a cargo box lifting mechanism thereof. BACKGROUND

[0002] The mine vehicle is an important mine transportation equipment, which usually needs to work continuously for a long time with large load, and the working environment is relatively complex and harsh. For the cargo box lifting mechanism of the mine vehicle, the typical way is to lift by the hydraulic cylinder, and after the hydraulic cylinder lifts the cargo box, the goods in the cargo box can be poured out to realize the unloading operation.

[0003] At present, the carrying capacity of the cargo box of the mine vehicle is increasing, and how to improve the lifting stability has become a technical bottleneck in the industry. SUMMARY

[0004] To solve the above technical problems, the present application provides a mine vehicle and a cargo box lifting mechanism thereof, which can effectively improve the stability of the chassis and the cargo box during lifting through the structural optimization of the cargo box lifting mechanism, and provides good technical support for effectively improving the carrying capacity of the whole vehicle.

[0005] The present application provides a cargo box lifting mechanism of a mine vehicle, which comprises a vehicle frame, a cargo box, a hydraulic cylinder and a cylinder support, wherein the cargo box is located on the vehicle frame, the cargo box comprises a first hinge part and a second hinge part, the first hinge part of the cargo box is connected with the vehicle frame through a first hinge mechanism to rotate relative to the vehicle frame to switch between a carrying state and an unloading state; the cylinder support is fixedly arranged on the vehicle frame, the upper part of the cylinder support is welded and fixed with the vehicle frame through a first welding position and a second welding position, and the lower part of the cylinder support comprises a third hinge part; one end of the hydraulic cylinder is connected with the second hinge part of the cargo box through a second hinge mechanism, and the other end of the hydraulic cylinder is connected with the third hinge part of the lower part of the cylinder support through a third hinge mechanism.

[0006] Optionally, the maximum included angle a between the cargo box in the unloading state and the horizontal extension surface of the vehicle frame is 52°, and the included angle β between the center line of the hydraulic cylinder and the rear horizontal extension surface of the vehicle frame is 55°-65°.

[0007] Optionally, the vehicle frame comprises a left frame beam and a right frame beam, and the two are arranged in parallel; the hydraulic cylinder and the cylinder support are correspondingly arranged as two groups, one group is a left cylinder support and a left hydraulic cylinder arranged on the outer side of the left frame beam, and the other group is a right cylinder support and a right hydraulic cylinder arranged on the outer side of the right frame beam.

[0008] Optionally, a middle axle torsion cylinder is arranged between the left frame beam and the right frame beam, the middle axle torsion cylinder is fixedly inserted into the left frame beam and the right frame beam, and two ends of the middle axle torsion cylinder respectively extend out of the left frame beam and the right frame beam, the left cylinder support and the right cylinder support are respectively fixedly sleeved on the two ends of the middle axle torsion cylinder through first welding positions, the left cylinder support and the right cylinder support are respectively fixedly sleeved on the upper support pipes through second welding positions, and the left cylinder support and the right cylinder support are respectively fixed through the upper support pipes and the left frame beam and the right frame beam on the corresponding side; the lower parts of the left cylinder support and the right cylinder support are respectively fixedly sleeved on the two ends of the lower support pipe, and the lower support pipe is located below the frame.

[0009] Optionally, the cylinder support is welded and fixed with the lower support pipe through a third welding position, and the third welding position is located on the front side of the third hinge part.

[0010] Optionally, the cylinder support comprises a first side plate and a second side plate, the first side plate is located on the outer side away from the frame, the second side plate is located on the inner side close to the frame, and the two are fixedly sleeved on the upper support pipe, the lower support pipe and the middle axle torsion cylinder.

[0011] Optionally, the first side plate and the second side plate are welded and fixed with the two side ends of the middle axle torsion cylinder, and a torsion cylinder reinforcing plate is arranged at the welding position; the first side plate and the second side plate are welded and fixed with the upper support pipe, and a support pipe reinforcing plate is arranged at the welding position.

[0012] Optionally, the cylinder support further comprises an inner support pipe, the inner support pipe is located between the first side plate and the second side plate, and is welded and fixed with the first side plate and the second side plate.

[0013] Optionally, the inner and outer sides of the beam body of the left frame beam and the inner and outer sides of the beam body of the right frame beam are provided with reinforcing gussets, each reinforcing gusset is located on the outer periphery of the middle axle torsion cylinder, an inclined angle for welding is arranged at the contact position of the reinforcing gusset and the middle axle torsion cylinder, and the contact boundary of the reinforcing gusset and the corresponding beam body is welded and fixed.

[0014] The application further provides a mining vehicle, wherein the mining vehicle adopts the cargo box lifting mechanism of the mining vehicle.

[0015] Compared with the prior art, the box lifting mechanism of the mining vehicle is innovative, specifically, the upper part of the oil cylinder support is welded and fixed with the frame through the first welding position and the second welding position, one end of the hydraulic oil cylinder is connected with the second hinge part of the box through the second hinge mechanism, and the other end of the hydraulic oil cylinder is connected with the third hinge part of the lower part of the oil cylinder support through the third hinge mechanism. During lifting operation, the hydraulic oil cylinder is extended and pushes the box to move upward to unload, the oil cylinder support serving as a lifting bearing structure forms an inverted triangular bearing structure with the first welding position and the second welding position located at the upper part and the third hinge part located at the lower part, and thus, the stability of the chassis and the box during lifting can be effectively improved.

[0016] In an optional solution of the present application, the maximum included angle a between the box and the horizontal extension surface of the frame in the unloading state is 52°, and the included angle β between the center line of the hydraulic oil cylinder and the rear horizontal extension surface of the frame is 55°-65°. In actual application, the included angle β between the center line of the hydraulic oil cylinder and the rear horizontal extension surface of the frame in the carrying state of the box can be 55°, and the included angle β between the center line of the hydraulic oil cylinder and the rear horizontal extension surface of the frame in the unloading state of the box can be 65°. Thus, the shortest cylinder length and the smallest thrust force can be used to achieve the limit lifting of the box with the included angle a of 52°, the material pouring speed can be improved, the material accumulation can be avoided, and the risk of rear overturning caused by the too-rear center of gravity of the vehicle can be effectively avoided.

[0017] In another optional solution of the present application, the middle bridge torsion cylinder is arranged between the left frame beam and the right frame beam, and the two ends of the middle bridge torsion cylinder extend out of the left frame beam and the right frame beam respectively; the left oil cylinder support and the right oil cylinder support are respectively fixed on the two ends of the middle bridge torsion cylinder through the first welding position, are respectively fixed on the upper support pipes through the second welding position, and are respectively fixed with the left frame beam and the right frame beam of the corresponding side through the upper support pipes; the lower parts of the left oil cylinder support and the right oil cylinder support are respectively fixed on the two ends of the lower support pipe, and the lower support pipe is located below the frame. In this way, the upper parts of the left oil cylinder support and the right oil cylinder support form two connection points fixed with the frame beams of the corresponding side through the middle bridge torsion cylinder and the upper support pipe respectively, and the middle bridge torsion cylinder has the function of increasing the torsion resistance of the frame; meanwhile, the two oil cylinder supports (the left oil cylinder support and the right oil cylinder support), the middle bridge torsion cylinder, the lower support pipe, the upper support pipe, and the left frame beam and the right frame beam are fixed to form a ring beam structure. Thus, the left and right torsional deformation resistance is good, the stress caused by lifting the box can be effectively dispersed through the support pipes, and the stability of the chassis and the box of the whole vehicle can be effectively improved. In addition, the oil cylinder support and the support share the middle bridge torsion cylinder, the overall structure weight can be reduced, and the design requirement of the product lightening trend is met.

[0018] In still another optional solution of the present application, the left and right frame beams are provided with reinforcing pads on the inner and outer sides of the beam bodies, and the reinforcing pads are located at the outer periphery of the middle bridge torsion cylinder; the contact positions of the reinforcing pads and the middle bridge torsion cylinder are provided with inclined angles for welding, so as to increase the welding penetration and the welding contact area, and enhance the stability of the welding structure; and the contact boundaries of the reinforcing pads and the corresponding beam bodies are welded and fixed, and the longer welds can disperse the stress borne by the frame beams, avoid stress concentration and cracking of the frame beams, and improve the overall structural strength of the vehicle frame. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 A schematic view of a cargo box lifting mechanism of a mine vehicle provided in an embodiment of the present application;

[0020] Figure 2 A partial enlarged view of a cylinder support and a frame shown in Figure 1

[0021] Figure 3 A schematic view of a lifting state of the cargo box lifting mechanism shown in Figure 1

[0022] Figure 4 A schematic view of an assembly relationship of a cylinder support and a frame provided in an embodiment of the present application;

[0023] Figure 5 A view in the E direction of Figure 4

[0024] A view in the D direction of Figure 6 Figure 4

[0025] Figure 7 An assembly relationship explosion view of the cylinder support shown in Figure 4 BRIEF DESCRIPTION OF DRAWINGS

[0026] Cargo box 10;

[0027] Frame 20, left frame beam 201, right frame beam 202, middle bridge torsion cylinder 203, outer reinforcing pad 204, inner reinforcing pad 205, torsion cylinder reinforcing plate 206;

[0028] Hydraulic cylinder 30;

[0029] Cylinder support 40, left cylinder support 401, right cylinder support 402, upper support pipe 4a, lower support pipe 4b, first side plate 4c, second side plate 4d, inner support pipe 4e, outer torsion cylinder reinforcing plate 4f, inner torsion cylinder reinforcing plate 4g, outer support pipe reinforcing plate 4h, inner support pipe reinforcing plate 4i, support pipe reinforcing plate 4j;

[0030]

[0031] ​​​​​The first hinged mechanism 50;

[0032] The second hinged mechanism 60;

[0033] The third hinged mechanism 70. DETAILED DESCRIPTION

[0034] In order for those skilled in the art to better understand the technical solutions of the present application, the present application will be further described in detail below in combination with the drawings and specific embodiments.

[0035] Generally, the mine vehicle needs to work for a long time with large load and in a complex and harsh environment, and the carrying capacity of the mine vehicle cargo box also shows a trend of increasing evolution. For the cargo box lifting mechanism of the mine vehicle, the lifting stability needs to be effectively improved.

[0036] Based on this, the embodiment of the present application provides a cargo box lifting mechanism of a mine vehicle, which comprises a vehicle frame, a cargo box, a hydraulic oil cylinder and an oil cylinder support, wherein the cargo box is located on the vehicle frame, a first hinged part of the cargo box is connected with the vehicle frame through a first hinged mechanism to rotate relative to the vehicle frame to switch between a carrying state and a discharging state; the oil cylinder support is fixedly arranged on the vehicle frame, and an upper part of the oil cylinder support is welded and fixed with the vehicle frame through a first welding position and a second welding position; one end of the hydraulic oil cylinder is connected with a second hinged part of the cargo box through a second hinged mechanism, and the other end of the hydraulic oil cylinder is connected with a third hinged part of a lower part of the oil cylinder support through a third hinged mechanism.

[0037] During lifting operation, the hydraulic oil cylinder extends and pushes the cargo box to move upward to discharge, and the oil cylinder support as a lifting bearing structure forms an inverted triangular bearing structure at the first welding position and the second welding position on the upper part and the third hinged part on the lower part. In this way, the stability of the chassis and the cargo box during lifting can be effectively improved.

[0038] In order to better understand the technical solutions and technical effects of the present application, the specific embodiments will be described in detail below in combination with the drawings. Please refer to Figure 1 、 Figure 2 and Figure 3 wherein, Figure 1 is a schematic view of a cargo box lifting mechanism of a mine vehicle provided by the embodiment of the present application, Figure 2 is Figure 1 is a schematic view of the assembly relationship between the oil cylinder support and the vehicle frame shown in Figure 3 is Figure 1 is a schematic view of a lifting state of the cargo box lifting mechanism shown in

[0039] As Figure 1The shown container lifting mechanism, the container 10 is located on the frame 20, the container 10 includes two hinged parts, respectively used for hinged with the frame 20 and the hydraulic cylinder 30. The first hinged part is connected with the frame 20 through the first hinged mechanism 50, the second hinged part is connected with one end (for example, the cylinder rod end) of the hydraulic cylinder 30 through the second hinged mechanism 60, and the other end (for example, the cylinder barrel end) of the hydraulic cylinder 30 is connected with the third hinged part of the cylinder support 40 through the third hinged mechanism 70.

[0040] In a specific implementation, the first hinged mechanism 50, the second hinged mechanism 60 and the third hinged mechanism 70 can be implemented by using the prior art as long as the corresponding hinged connection function can be realized, and the embodiments of the present application are not limited.

[0041] In the embodiment, the upper part of the cylinder support 40 is fixedly welded with the frame 20 through the first welding position A and the second welding position B, and the lower part of the cylinder support 40 forms the third hinged part for hinged with the hydraulic cylinder 30. Figure 2 As shown, the stable load bearing structure in the shape of an inverted triangle is formed.

[0042] Among them, the second hinged part of the container 10 is located on the front side of the first hinged part, the third hinged part of the cylinder support 40 is located on the lower side of the frame 20, and the material is dumped to the rear side under the pushing of the hydraulic cylinder 30, please refer to Figure 2 The lifting state shown. The orientation words "front" and "rear" used herein, and the orientation words "left" and "right" involved below, are defined with the vehicle as the description reference. It should be understood that the use of the above-mentioned relative orientation words is for clear description of the relative position relationship between the scheme structure or the structures, and does not constitute a substantial limitation on the scheme of the present application.

[0043] Specifically, in order to reasonably consider the influence of material dumping efficiency and dynamic change of vehicle center of gravity, as preferred, Figure 1 and Figure 3 As shown, the maximum included angle α between the container 10 and the horizontal extension surface of the frame can be 52°, and correspondingly, the included angle β between the center line of the hydraulic cylinder 30 and the horizontal extension surface of the rear side of the frame can be 55°-65°, for example, when the container 10 is in the carrying state shown in Figure 1 , the included angle β between the center line of the hydraulic cylinder 30 and the horizontal extension surface of the rear side of the frame can be 55°, and when the container 10 is in the unloading state shown in Figure 3 , the included angle β between the center line of the hydraulic cylinder 30 and the horizontal extension surface of the rear side of the frame can be 65°. In this way, the shortest cylinder length and the smallest pushing force can be used to realize the limit lifting of the container 10 with the included angle α of 52°, the material dumping speed can be improved, the material accumulation can be avoided, and the risk of rear overturning caused by the too rear center of gravity of the vehicle can be effectively avoided.

[0044] In the embodiment, the frame 20 comprises a left frame beam 201 and a right frame beam 202, which are arranged substantially in parallel to provide a stable and reliable foundation load bearing. The hydraulic oil cylinder 30 and the oil cylinder support 40 are arranged in pairs, and are arranged on both sides of the frame 20. Among them, the left oil cylinder support 401 is located on the outer side of the left frame beam 201, and the right oil cylinder support 402 is located on the outer side of the right frame beam 202. Here, the "outer side" of the left frame beam 201 and the right frame beam 202 refers to the side of the corresponding frame beam away from the longitudinal center line of the frame, and correspondingly, the "inner side" of the left frame beam 201 and the right frame beam 202 refers to the other side of the corresponding frame beam close to the longitudinal center line of the frame.

[0045] Please see Figure 4 、 Figure 5 and Figure 6 , wherein Figure 4 is a schematic diagram of the assembly relationship between the oil cylinder support and the frame provided by the embodiment of the present application, Figure 5 is an E view of Figure 4 , Figure 6 is a D view of Figure 4 .

[0046] As shown in Figure 4 , the middle bridge torsion cylinder 203 is arranged between the left frame beam 201 and the right frame beam 202 of the frame 20, the middle bridge torsion cylinder 203 is inserted and fixed to the left frame beam 201 and the right frame beam 202, and the two ends of the middle bridge torsion cylinder 203 respectively extend out of the left frame beam 201 and the right frame beam 202. In a specific implementation, the middle bridge torsion cylinder 203 is connected through the circular openings of the left frame beam 201 and the right frame beam 202 respectively, and the connection is fixed by welding.

[0047] In the embodiment, the left oil cylinder support 401 and the right oil cylinder support 402 are respectively sleeved and fixed to the two ends of the middle bridge torsion cylinder 203 through the first welding position A, and the connection is fixed by welding. The left oil cylinder support 401 and the right oil cylinder support 402 are respectively sleeved and fixed to the upper support pipe 4a through the second welding position B, and are respectively fixed to the left frame beam 201 and the right frame beam 202 of the corresponding side through the upper support pipe 4a, and the connection is fixed by welding. The lower parts of the left oil cylinder support 401 and the right oil cylinder support 402 are respectively sleeved and fixed to the two ends of the lower support pipe 4b, and the connection is fixed by welding. In combination with Figure 2 、 Figure 5 and Figure 6 , the lower support pipe 4b is located below the frame 20, the oil cylinder support 40 is welded and fixed with the lower support pipe 4b through the third welding position C, and the third welding position C is located on the front side of the third hinge part. As shown in the figure, the side view of the oil cylinder support 40 is in the shape of a sickle-shaped inverted triangle structure.

[0048] Here, the upper parts of the left cylinder support 401 and the right cylinder support 402 form two connection points fixed with the corresponding side frame beams through the middle bridge torsion tube 203 and the upper support pipe 4a, and the middle bridge torsion tube 203 has the function of increasing the torsional rigidity of the frame; at the same time, the two cylinder supports (the left cylinder support 401 and the right cylinder support 402), the middle bridge torsion tube 203, the lower support pipe 4b, the upper support pipe 4a, and the left frame beam 201 and the right frame beam 202 are fixed to form a ring beam structure. Thus, it has good resistance to left and right torsional deformation, and can effectively disperse the stress brought by lifting the cargo box through each support pipe, effectively enhancing the stability of the whole vehicle chassis and the cargo box. In addition, the cylinder support 40 and the frame 20 share the middle bridge torsion tube 203, which can reduce the overall structure weight and meet the design requirements of the lightweight trend of products.

[0049] It can be understood that the hydraulic cylinders 30 and the cylinder supports 40 arranged in groups are symmetrically arranged on the left and right sides of the frame 20, and the structure configuration can be the same, so this paper will describe the structure of one side in detail.

[0050] In this embodiment, each cylinder support 40 includes a first side plate 4c and a second side plate 4d, the first side plate 4c is located on the outer side away from the frame 20, and the second side plate 4d is located on the inner side close to the frame 20, and the two are spaced and fixed on the upper support pipe 4a, the lower support pipe 4b and the middle bridge torsion tube 203.

[0051] In specific implementation, at the welding position of the first side plate 4c and the second side plate 4d and the end of the middle bridge torsion tube 203, a torsion tube reinforcing plate can be provided. Please see the assembly relationship explosion diagram of the cylinder support shown in Figure 7 , which is Figure 4 .

[0052] As shown in Figure 7 , the outer side torsion tube reinforcing plate 4f is welded and fixed at the welding position of the first side plate 4c and the middle bridge torsion tube 203, and the inner side torsion tube reinforcing plate 4g is welded and fixed at the welding position of the second side plate 4d and the middle bridge torsion tube 203, thereby effectively enhancing the stability between the cylinder support 40 and the middle bridge torsion tube 203.

[0053] In other specific implementations, at the welding position of the first side plate 4c and the second side plate 4d and the upper support pipe 4a, a support pipe reinforcing plate can also be provided. As shown in Figure 7 , the outer side support pipe reinforcing plate 4h is welded and fixed at the welding position of the first side plate 4c and the upper support pipe 4a, and the inner side support pipe reinforcing plate 4i is welded and fixed at the welding position of the second side plate 4d and the upper support pipe 4a, thereby further increasing the structural stability of the cylinder support 40 and avoiding cracking of the support.

[0054] In order to further improve the structural stability of the oil cylinder support 40, in the specific implementation, the oil cylinder support 40 can further include an inner support pipe 4e located between the first side plate 4c and the second side plate 4d and welded and fixed with the first side plate 4c and the second side plate 4d respectively. In this way, the overall load-carrying capacity of the oil cylinder support 40 can be further improved.

[0055] In addition, the left frame beam 201 and the right frame beam 202 are both provided with a reinforcing gusset plate on the inner and outer sides of the beam body. Please see Figure 4 、 Figure 5 、 Figure 6 and Figure 7 , on the outer side of the left frame beam 201 and the right frame beam 202, an outer reinforcing gusset plate 204 is respectively arranged; on the inner side of the left frame beam 201 and the right frame beam 202, an inner reinforcing gusset plate 205 is respectively arranged. In the specific implementation, an inclined angle for welding is arranged at the contact position of each reinforcing gusset plate (the outer reinforcing gusset plate 204 and the inner reinforcing gusset plate 205) and the middle bridge torsion cylinder 203, so as to increase the welding penetration and the welding contact surface at the same time, and enhance the stability of the welding structure.

[0056] In addition, the contact boundary of each reinforcing gusset plate (the outer reinforcing gusset plate 204 and the inner reinforcing gusset plate 205) and the frame beam (the left frame beam 201 and the right frame beam 202) is welded and fixed, and the long welding seam can disperse the stress borne by the frame beam, so as to avoid stress concentration and cracking of the frame beam, and improve the overall structural strength of the vehicle frame 20.

[0057] Further, at the two ends of the lower support pipe 4b welded with the first side plate 4c of the two oil cylinder supports 40, a support pipe reinforcing plate 4j can be arranged at each end, and the connection is fixed by welding. Similarly, at the two ends of the middle bridge torsion cylinder 203 welded with the first side plate 4c of the two oil cylinder supports 40, a torsion cylinder reinforcing plate 206 can also be arranged at each end, and the connection is fixed by welding. In the specific implementation, it can be determined according to the overall design requirements of the product, and the embodiments of the present application are not limited.

[0058] In addition to the foregoing mine vehicle cargo box lifting mechanism, the embodiments of the present application also provide a mine vehicle adopting the mine vehicle cargo box lifting mechanism as described above. It should be understood that other functional components of the mine vehicle are not the core of the present application, and those skilled in the art can use the prior art to realize it, so this text will not be repeated.

[0059] It should be noted that the ordinal numbers used in the above embodiments provided by the present embodiment are used to distinguish the same functional components or structures, and it should be understood that the use of the above ordinal numbers is only used to distinguish different limited objects, and does not constitute a substantial limitation on the mine vehicle chassis claimed by the present application.

[0060] The above merely is the preferred embodiment of the present application, it should be pointed out that, for ordinary skilled in the art, without departing from the principles of the present application, can also make a number of improvements and refinements, these improvements and refinements should also be considered as the protection scope of the present application.

Claims

1. A cargo box lifting mechanism for a mining vehicle, characterized in that, The cargo box lifting mechanism includes a frame, a cargo box, a hydraulic cylinder, and a cylinder support. The cargo box is located on the frame and includes a first hinge and a second hinge. The first hinge of the cargo box is connected to the frame via a first hinge mechanism to allow rotation relative to the frame between a carrying state and an unloading state. The cylinder support is fixedly mounted on the frame. The upper part of the cylinder support is welded to the frame via a first welding position and a second welding position. The lower part of the cylinder support includes a third hinge. One end of the hydraulic cylinder is connected to the second hinge of the cargo box via a second hinge mechanism, and the other end of the hydraulic cylinder is connected to the third hinge of the lower part of the cylinder support via a third hinge mechanism. The vehicle frame includes a left frame beam and a right frame beam, which are arranged in parallel. The hydraulic cylinders and cylinder supports are configured in two sets, one set consisting of a left cylinder support and a left hydraulic cylinder located on the outer side of the left frame beam, and the other set consisting of a right cylinder support and a right hydraulic cylinder located on the outer side of the right frame beam. A middle axle torsion cylinder is installed between the left and right frame beams, and is inserted and fixed to both the left and right frame beams, with both ends of the middle axle torsion cylinder extending out from the left frame beam. The frame beam and the right frame beam, the left cylinder support and the right cylinder support are respectively fixed to both ends of the middle axle torsion cylinder through a first welding position; the left cylinder support and the right cylinder support are respectively fixed to the corresponding upper support tube through a second welding position, and are respectively fixed to the left frame beam and the right frame beam on the corresponding side through the upper support tube; the lower parts of the left cylinder support and the right cylinder support are respectively fixed to both ends of the lower support tube, and the lower support tube is located below the frame.

2. The cargo box lifting mechanism for mining vehicles according to claim 1, characterized in that, When the cargo box is in the unloading state, the maximum angle α between it and the horizontal extension surface of the vehicle frame is 52°, and the angle β between the centerline of the hydraulic cylinder and the rear horizontal extension surface of the vehicle frame is 55° to 65°.

3. The cargo box lifting mechanism for mining vehicles according to claim 1, characterized in that, The cylinder support is welded and fixed to the lower support tube at a third welding position, and the third welding position is located on the front side of the third hinge.

4. The cargo box lifting mechanism for mining vehicles according to claim 1, characterized in that, The cylinder support includes a first side plate and a second side plate. The first side plate is located on the outer side away from the frame, and the second side plate is located on the inner side close to the frame. The two side plates are spaced apart and fixed to the upper support tube, the lower support tube, and the middle axle torsion cylinder.

5. The cargo box lifting mechanism for mining vehicles according to claim 4, characterized in that, The first side plate and the second side plate are welded and fixed to the two ends of the middle bridge torsion cylinder, and torsion cylinder reinforcing plates are respectively provided at the weld joints; the first side plate and the second side plate are welded and fixed to the upper support pipe, and support pipe reinforcing plates are respectively provided at the weld joints.

6. The cargo box lifting mechanism for mining vehicles according to claim 4, characterized in that, The cylinder support also includes an inner support tube, which is located between the first side plate and the second side plate, and is welded and fixed to the first side plate and the second side plate respectively.

7. The cargo box lifting mechanism for mining vehicles according to claim 1, characterized in that, Reinforcing pads are provided on both the inner and outer sides of the left frame beam and the inner and outer sides of the right frame beam. Each reinforcing pad is located on the outer periphery of the middle axle torsion cylinder. The contact point between the reinforcing pad and the middle axle torsion cylinder is provided with an oblique angle for welding, and the contact boundary between the reinforcing pad and the corresponding beam is welded and fixed.

8. A mining vehicle, characterized in that, The mining vehicle adopts the cargo box lifting mechanism of the mining vehicle as described in any one of claims 1 to 7.

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