Lifting device and mining dump truck

Abstract

The invention provides a lifting device and a mining dump truck. The lifting device comprises a lifting support and two lifting fixing seats. Two transverse end parts of the lifting support are respectively positioned above the two longitudinal beams; one lifting fixing seat is arranged between one transverse end part of the lifting support and the left longitudinal beam, and the other lifting fixing seat is arranged between the other transverse end part of the lifting support and the right longitudinal beam; the lifting fixing seat is fixedly connected with the longitudinal beam, and the lifting fixing seat is detachably connected with the transverse end part of the lifting support; the lifting fixing base is of a three-side-wrapped structure and comprises an outer vertical plate, an inner vertical plate and an upper mounting plate. The outer vertical plate is welded with the outer side vertical surface of the longitudinal beam; the inner vertical plate is welded with the vertical surface of the inner side of the longitudinal beam; the upper mounting plate is arranged above the top plane of the longitudinal beam, the bottom plane of the upper mounting plate is welded with the top planes of the outer vertical plate and the inner vertical plate, and the lifting support is connected with the upper mounting plate through a detachable part. It can be ensured that the assembling position of the lifting oil cylinder does not deviate.

Description

Technical Field

[0001] The invention relates to a lifting device and belongs to the technical field of mining dump trucks. Background Art

[0002] In the current mining dump truck market, problems such as damage to the lifting cylinder caused by eccentric wear of the cylinder occur frequently, which may cause production safety accidents in severe cases. In order to reduce the offset of the lifting cylinder when lifting the cargo box, it is necessary to ensure that the position of the lifting base relative to the rear articulated support is as accurate as possible. The rear articulated support is a welded part with a relatively fixed position, and the lifting support is an assembly part that is prone to position offset. In addition, the lifting support is installed on the left and right lifting fixed seats, so the position accuracy of the left and right lifting fixed seats directly affects the accuracy of the position of the lifting base, which in turn affects the offset degree of the lifting cylinder.

[0003] However, due to the limitation of cost and processing technology, the processing and position errors of the left and right longitudinal beams themselves are relatively large, and the lifting fixing seat is directly welded to the longitudinal beam, so the distance error between the left and right lifting fixing seats is also relatively large. In order to ensure that the assembly position of the lifting cylinder does not deviate, the present invention designs the mounting hole on the lifting fixing seat as an oblong hole to compensate for the deviation caused by processing. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a lifting device capable of ensuring that the assembly position of the lifting cylinder does not deviate.

[0005] The present invention is implemented according to the following technical solutions: In the first aspect, the present invention provides a lifting device, comprising a lifting support and two symmetrically arranged lifting fixing seats; the two lateral ends of the lifting support are respectively located above two longitudinal beams arranged side by side at a predetermined interval in the same plane; one of the lifting fixing seats is arranged between one lateral end of the lifting support and the left longitudinal beam, and the other lifting fixing seat is arranged between the other lateral end of the lifting support and the right longitudinal beam; the lifting fixing seat is fixedly connected to the longitudinal beam, and the lifting fixing seat is detachably connected to the lateral end of the lifting support; wherein the lifting fixing seat is a three-sided structure, comprising an outer vertical plate, an inner vertical plate and an upper mounting plate; the outer vertical plate is welded to the outer vertical surface of the longitudinal beam after being bonded together; the inner vertical plate is welded to the inner vertical surface of the longitudinal beam after being bonded together; the upper mounting plate is arranged above the top plane of the longitudinal beam, the bottom plane of the upper mounting plate is welded to the top planes of the outer vertical plate and the inner vertical plate, and the lifting support and the upper mounting plate are connected together by a detachable component.

[0006] In some embodiments, the upper mounting plate is provided with two groups of fixing points arranged side by side at predetermined intervals, and each group of fixing points is composed of a plurality of through holes arranged at intervals and extending longitudinally; the outer group of fixing points is located on the outer side of the longitudinal beam, and the vertical projection of each through hole falls on the outside of the longitudinal beam, and is fixed together with the lifting support through a group of first detachable parts; the inner group of fixing points is located above the longitudinal beam, and the vertical projection of each through hole falls on the longitudinal beam, and is fixed together with the lifting support through a group of second detachable parts.

[0007] In some embodiments, the first detachable components are bolts and nuts; the lateral ends of the lifting support are provided with mounting holes corresponding one to one with the through holes in a group of fixing points on the outside; after the bolts are inserted into the through holes and the mounting holes, the nuts are used to tighten the bolts to fix the upper mounting plate and the lifting support together.

[0008] In some embodiments, the through hole is an oblong hole opened transversely, so that the lifting support can be adjusted in the transverse direction.

[0009] In some embodiments, the second detachable component is a bolt; an auxiliary fastening component is provided between the outer vertical plate and the inner vertical plate, for cooperating with through holes and bolts in a group of fixing points on the outside to fix the upper mounting plate and the lifting support together.

[0010] In some embodiments, the auxiliary fastening component comprises: Two limit plates are fixed on the bottom plane of the upper mounting plate between the outer vertical plate and the inner vertical plate in an opposite direction along the longitudinal direction; The movable fixing plate is assembled between the two limit plates, and is used to limit the movement of the movable fixing plate in the vertical and longitudinal directions, but does not limit the movement of the movable fixing plate in the lateral direction; the movable fixing plate is provided with threaded holes corresponding to the through holes in a group of fixing points on the inner side, and the bolts are inserted into the through holes and tightened in the threaded holes to fix the upper mounting plate and the lifting support together.

[0011] In some embodiments, the through hole is a transversely opened oblong hole, the length of the oblong hole is C, the width of the oblong hole is B, and B=2R, R is the radius of the semicircles on both sides of the oblong hole; the distance between the limit plate and the outer vertical plate is d1, and the distance between the limit plate and the inner vertical plate is d2; the position of the threaded hole on the movable fixed plate must satisfy the following relationship: when the threaded hole is exactly at the center position of the oblong hole on the inner side of the upper mounting plate, d1=d2; the range of position adjustment of the lifting support in the lateral direction is the adjustment amount of the oblong hole, and the adjustment amount must satisfy the following relationship: CB=d1+d2.

[0012] In some embodiments, the limiting plate is an L-shaped plate, and the movement of the movable fixed plate in the longitudinal direction is limited by the vertical plates in the L-shaped plates on both sides, and the movement of the movable fixed plate in the vertical direction is limited by the horizontal plates in the L-shaped plates on both sides and the upper mounting plate; the surface of the movable fixed plate in contact with the upper mounting plate is a rough surface, and the surface of the movable fixed plate in contact with the horizontal plate in the L-shaped plate is a smooth surface.

[0013] In some embodiments, an inner rib is welded at each end of the gap between the outer vertical plate and the inner vertical plate along the longitudinal direction; and a plurality of outer ribs arranged at intervals along the longitudinal direction are welded at the connection between the upper mounting plate and the outer vertical plate.

[0014] In some embodiments, the outer vertical plate is provided with a plurality of through holes, and the peripheries of the through holes are welded together with the outer vertical surface of the longitudinal beam; the inner vertical plate is provided with a plurality of through holes, and the peripheries of the through holes are welded together with the inner vertical surface of the longitudinal beam.

[0015] In some embodiments, the lifting support comprises: A pair of lifting plates that are opposite to each other and have an L-shaped structure, spanning the two longitudinal beams, and the transverse center line between the two lifting plates and the longitudinal center line between the two longitudinal beams are perpendicular to each other; A pair of mounting plates facing each other are respectively arranged at two lateral ends of the two lifting vertical plates, and the top surfaces of the mounting plates are welded to the bottom surfaces of the horizontal plates in the two corresponding lifting vertical plates; At least one reinforcing rib is welded between the vertical plates of the two lifting plates.

[0016] In a second aspect, the present invention provides a mining dump truck, comprising the above-mentioned lifting device.

[0017] Beneficial effects of the present invention: 1. The lifting bracket is a three-sided structure, which is more stable and reliable, and the welds fixed with the longitudinal beam are not easy to crack.

[0018] 2. The lifting bracket is equipped with a fixing plate with threaded holes that can be moved left and right, which can be flexibly adjusted according to the position of the lifting bracket. At the same time, after the rough surface of the fixing plate is clamped by bolts, the lifting bracket is not easy to move left and right due to harsh working conditions, affecting the safety of the mining dump truck.

[0019] 3. For vehicles that have already encountered problems in the market and need to be replaced with a three-sided wrap structure due to defects in the old structure, it is only necessary to replace it with the lifting fixed seat of the structure described in the present invention. It is more flexible to adapt and can be adapted to old lifting supports and other components, saving costs.

[0020] 4. The traditional lifting support is an integrated structure, and the inner size is limited by the processing technology and has a large error, making it difficult to ensure the use requirements. The present invention changes it to a split structure. The two lifting vertical plates can better control the tolerance of the inner size. At the same time, the split structure can be processed and cut in advance, and positioning welding can be performed according to the actual required inner size, saving time and cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings are part of the present invention and are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention, but do not constitute an improper limitation of the present invention. Obviously, the accompanying drawings described below are only some embodiments. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without creative work.

[0022] In the attached picture: Figure 1 It is the overall arrangement diagram of the lifting device of the present invention; Figure 2 A three-dimensional diagram of a lifting and fixing seat of the present invention; Figure 3 It is a front view of the lifting fixing seat of the present invention; Figure 4 It is a side view of the lifting bracket of the present invention; Figure 5 A top view of the lifting bracket of the present invention; Figure 6 A bottom view of the lifting bracket of the present invention; Figure 7 A three-dimensional diagram of a movable fixed plate of the present invention; Figure 8 It is a three-dimensional diagram of the lifting support of the present invention.

[0023] The accompanying drawings are marked with: lifting fixed seat 1, lifting support 2, left longitudinal beam 3, right longitudinal beam 4; upper mounting plate 11, inner vertical plate 12, outer vertical plate 13, outer rib plate 14, inner rib plate 15, movable fixing plate 16, limiting plate 17, oblong hole 18, threaded hole 19; lifting vertical plate 21, mounting plate 22, reinforcing rib 23.

[0024] It should be noted that these drawings and textual descriptions are not intended to limit the conceptual scope of the present invention in any way, but are intended to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0026] In the description of the present invention, it should be noted that the directions or positional relationships indicated by terms such as “upper”, “lower”, “front”, “back”, “left”, “right”, “vertical”, “inside” and “outside” are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0027] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] like Figure 1 As shown, a lifting device comprises a lifting support 2 and two lifting fixing seats 1 arranged symmetrically; the two transverse ends of the lifting support 2 are respectively located above the left longitudinal beam 3 and the right longitudinal beam 4 arranged side by side at a predetermined interval in the same plane; one of the lifting fixing seats 1 is arranged between one transverse end of the lifting support 2 and the left longitudinal beam 3, and the other lifting fixing seat 1 is arranged between the other transverse end of the lifting support 2 and the right longitudinal beam 4; the lifting fixing seat 1 is fixedly connected to the longitudinal beams 3 and 4, and the lifting fixing seat 1 is connected to the transverse end of the lifting support 2. The lifting bracket 1 is a three-sided structure, including an outer vertical plate 13, an inner vertical plate 12 and an upper mounting plate 11; the outer vertical plate 13 is welded to the outer vertical surfaces of the longitudinal beams 3 and 4; the inner vertical plate 12 is welded to the inner vertical surfaces of the longitudinal beams 3 and 4; the upper mounting plate 11 is arranged above the top plane of the longitudinal beams 3 and 4, the bottom plane of the upper mounting plate 11 is welded to the top planes of the outer vertical plate 13 and the inner vertical plate 12, and the lifting bracket 2 is connected to the upper mounting plate 11 through a detachable part.

[0029] The specific structure of the above-mentioned lifting fixing seat is further described below.

[0030] like Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6As shown, the upper mounting plate 11 is provided with two groups of fixing points arranged side by side at a predetermined interval, and each group of fixing points is composed of a plurality of through holes arranged at intervals and extending longitudinally; the outer group of fixing points is located on the outer sides of the longitudinal beams 3 and 4, and the vertical projection of each through hole falls on the outside of the longitudinal beams 3 and 4, and is fixed to the lifting support 2 through a group of first detachable components; the inner group of fixing points is located above the longitudinal beams 3 and 4, and the vertical projection of each through hole falls on the longitudinal beams 3 and 4, and is fixed to the lifting support 2 through a group of second detachable components.

[0031] Further solutions, such as Figure 1 , Figure 2 , Figure 8 As shown, the first detachable component is a bolt and a nut; the lateral end of the lifting support 2 is provided with a mounting hole corresponding to the through holes in a group of fixing points on the outside. After the bolts are inserted into the through holes and the mounting holes, the bolts are tightened by nuts to fix the upper mounting plate 11 and the lifting support 2 together.

[0032] Further solutions, such as Figure 2 , Figure 5 , Figure 6 As shown, the through hole is an oblong hole 18 opened transversely, so that the lifting support 2 can be adjusted in the transverse direction.

[0033] Further solutions, such as Figure 1 , Figure 2 , Figure 6 As shown, the second detachable component is a bolt; an auxiliary fastening component is provided between the outer plate 13 and the inner plate 12, which is used to cooperate with the through holes and bolts in a group of fixing points on the outside to fix the upper mounting plate 11 and the lifting support 2 together.

[0034] The specific structure of the auxiliary fastening component is further described below.

[0035] like Figure 2 , Figure 6 As shown, the auxiliary fastening components include two limit plates 17 and a movable fixing plate 16; the two limit plates 17 are fixed on the bottom plane of the upper mounting plate 11 between the outer vertical plate 13 and the inner vertical plate 12 along the longitudinal direction; the movable fixing plate 16 is assembled between the two limit plates 17, and is used to limit the movement of the movable fixing plate 16 in the vertical direction and the longitudinal direction, and does not limit the movement of the movable fixing plate 16 in the lateral direction; the movable fixing plate 16 is provided with threaded holes 19 corresponding to the through holes in a group of fixing points on the inner side, and the bolts are inserted into the through holes and tightened in the threaded holes 19 to fix the upper mounting plate 11 and the lifting support 2 together.

[0036] Further solutions, such as Figure 4 , Figure 5 , Figure 6As shown, the through hole is a horizontally opened oblong hole, the length of the oblong hole is C, the width of the oblong hole is B, and B=2R, R is the radius of the semicircle on both sides of the oblong hole; the distance between the limit plate 17 and the outer vertical plate 13 is d1, and the distance between the limit plate 17 and the inner vertical plate 12 is d2; the position of the threaded hole 19 on the movable fixed plate 16 must meet the following relationship: when the threaded hole 19 is exactly at the center of the oblong hole inside the upper mounting plate 11, d1=d2; the range of position adjustment of the lifting support 2 in the lateral direction is the adjustment amount of the oblong hole, and the adjustment amount must meet the following relationship: CB=d1+d2. For example, CB =10mm, then the adjustment amount of the oblong hole is ±5mm.

[0037] Of course, the distance between the outer vertical plate 13 and the inner vertical plate 12 is A, and the length of the movable fixed plate 16 is D, A=D+d1+d2.

[0038] Further solutions, such as Figure 2 , Figure 6 , Figure 7 As shown, the limit plate 17 is an L-shaped plate, which limits the movement of the movable fixed plate 16 in the longitudinal direction by the vertical plates in the L-shaped plates on both sides, and limits the movement of the movable fixed plate 16 in the vertical direction by the horizontal plates in the L-shaped plates on both sides and the upper mounting plate 11; the surface of the movable fixed plate 16 in contact with the upper mounting plate 11 is a rough surface, and the surface of the movable fixed plate 16 in contact with the horizontal plate in the L-shaped plate is a smooth surface.

[0039] It should be noted that the rough surface may be a structure such as a V-groove or a convex point that can increase friction.

[0040] Further solutions, such as Figure 2 , Figure 3 , Figure 4 , Figure 6 As shown, an inner rib 15 is welded at each end of the gap between the outer vertical plate 13 and the inner vertical plate 12 along the longitudinal direction; a plurality of outer ribs 14 arranged at intervals along the longitudinal direction are welded at the connection between the upper mounting plate 11 and the outer vertical plate 13 .

[0041] Further solutions, such as Figure 2 , Figure 3 As shown, the outer vertical plate 13 is provided with a plurality of through holes, and the peripheries of the through holes are welded together with the outer vertical surfaces of the longitudinal beams 3 and 4; the inner vertical plate 12 is provided with a plurality of through holes, and the peripheries of the through holes are welded together with the inner vertical surfaces of the longitudinal beams 3 and 4.

[0042] The specific structure of the above-mentioned lifting fixing seat is further described below.

[0043] like Figure 1 , Figure 8As shown, the lifting support 2 includes a lifting vertical plate 21, a mounting plate 22 and at least one reinforcing rib 23; a pair of lifting vertical plates 21 opposite to each other and in an L-shaped structure span across the left longitudinal beam 3 and the right longitudinal beam 4, and the transverse center line between the two lifting vertical plates 21 and the longitudinal center line between the left longitudinal beam 3 and the right longitudinal beam 4 are perpendicular to each other; a pair of mounting plates 22 opposite to each other are respectively arranged at the two transverse ends of the two lifting vertical plates 21, and the top surface of the mounting plate 22 is welded to the bottom surface of the horizontal plate in the corresponding two lifting vertical plates 21; at least one reinforcing rib 23 is welded between the vertical plates in the two lifting vertical plates 21.

[0044] Continue to refer to Figure 1 As shown, the installation method is: first weld the lifting fixing seat 1 to the left longitudinal beam 3 and the right longitudinal beam 4 respectively, then determine the fixing position of the lifting support 2, first fix the outer oblong hole 18 with bolts, and then pass the bolts through the mounting plate 22, the oblong hole on the inner side of the upper mounting plate 11, and the threaded hole 19 on the movable fixing plate 16 in sequence, and clamp the movable fixing plate 16 through threaded connection.

[0045] In summary, the present invention provides a lifting device, which has the following functions and effects: 1. The lifting bracket is a three-sided structure, which is more stable and reliable, and the welds fixed with the longitudinal beam are not easy to crack.

[0046] 2. The lifting bracket is equipped with a fixing plate with threaded holes that can be moved left and right, which can be flexibly adjusted according to the position of the lifting bracket. At the same time, after the rough surface of the fixing plate is clamped by bolts, the lifting bracket is not easy to move left and right due to harsh working conditions, affecting the safety of the mining dump truck.

[0047] 3. For vehicles that have already encountered problems in the market and need to be replaced with a three-sided wrap structure due to defects in the old structure, it is only necessary to replace it with the lifting fixed seat of the structure described in the present invention. It is more flexible to adapt and can be adapted to old lifting supports and other components, saving costs.

[0048] 4. The traditional lifting support is an integrated structure, and the inner size is limited by the processing technology and has a large error, making it difficult to ensure the use requirements. The present invention changes it to a split structure. The two lifting vertical plates can better control the tolerance of the inner size. At the same time, the split structure can be processed and cut in advance, and positioning welding can be performed according to the actual required inner size, saving time and cost.

[0049] The mining dump truck provided by the present invention is described below. The mining dump truck described below and the lifting device described above can be referred to each other.

[0050] A mining dump truck provided by the present invention may include a lifting device as described in any one of the above embodiments.

[0051] The beneficial effects achieved by the mining dump truck provided by the present invention are consistent with the beneficial effects achieved by the lifting device provided by the present invention, and will not be described in detail here.

[0052] In the description provided herein, a large number of specific details are described. However, it is understood that embodiments of the present invention can be practiced without these specific details. In some instances, well-known methods, structures and techniques are not shown in detail so as not to obscure the understanding of this description.

[0053] In addition, those skilled in the art will understand that, although some embodiments described herein include certain features included in other embodiments but not other features, the combination of features of different embodiments also means being within the scope of protection of the present invention and forming different embodiments. For example, in the above embodiments, those skilled in the art can use them in combination according to the known technical solutions and the technical problems to be solved by this application.

[0054] The above is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with this patent can make some changes or modify the technical contents suggested above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the solution of the present invention.

Claims

1. A lifting device, characterized in that: include: A lifting support, two lateral ends of which are respectively located above two longitudinal beams arranged side by side at a predetermined interval in the same plane; Two lifting fixing seats are arranged symmetrically, wherein one lifting fixing seat is arranged between one transverse end of the lifting support and the left longitudinal beam, and the other lifting fixing seat is arranged between the other transverse end of the lifting support and the right longitudinal beam; the lifting fixing seat is fixedly connected to the longitudinal beam, and the lifting fixing seat is detachably connected to the transverse end of the lifting support; Wherein, the lifting fixing seat is a three-sided structure, including: The outer facade plate is welded to the outer facade of the longitudinal beam; An inner vertical plate is welded to the inner vertical surface of the longitudinal beam after being bonded to the inner vertical surface of the longitudinal beam; The upper mounting plate is arranged above the top plane of the longitudinal beam, the bottom plane of the upper mounting plate is welded to the top planes of the outer and inner vertical plates, and the lifting support is connected to the upper mounting plate through a detachable component.

2. A lifting device according to claim 1, characterized in that: The upper mounting plate is provided with two groups of fixing points arranged side by side at a predetermined interval, and each group of fixing points is composed of a plurality of through holes extending longitudinally and arranged at intervals; A set of fixing points on the outside are located on the outside of the longitudinal beam, and the vertical projection of each through hole falls on the outside of the longitudinal beam, and is fixed to the lifting support through a set of first detachable parts; A group of fixing points on the inner side are located above the longitudinal beam, and the vertical projection of each through hole falls on the longitudinal beam, and is fixed to the lifting support through a group of second detachable parts.

3. A lifting device according to claim 2, characterized in that: The first detachable components are bolts and nuts; the lateral ends of the lifting support are provided with mounting holes corresponding one to one with the through holes in a group of fixing points on the outside; after the bolts are inserted into the through holes and the mounting holes, the bolts are tightened by nuts to fix the upper mounting plate and the lifting support together.

4. A lifting device according to claim 3, characterized in that: The through hole is an oblong hole opened transversely, so that the position of the lifting support can be adjusted in the transverse direction.

5. A lifting device according to claim 2, characterized in that: The second detachable component is a bolt; an auxiliary fastening component is arranged between the outer vertical plate and the inner vertical plate, which is used to cooperate with the through holes and bolts in a group of fixing points on the outside to fix the upper mounting plate and the lifting support together.

6. A lifting device according to claim 5, characterized in that: The auxiliary fastening component comprises: Two limit plates are fixed on the bottom plane of the upper mounting plate between the outer vertical plate and the inner vertical plate in an opposite direction along the longitudinal direction; The movable fixing plate is assembled between the two limit plates, and is used to limit the movement of the movable fixing plate in the vertical and longitudinal directions, but does not limit the movement of the movable fixing plate in the lateral direction; the movable fixing plate is provided with threaded holes corresponding to the through holes in a group of fixing points on the inner side, and the bolts are inserted into the through holes and tightened in the threaded holes to fix the upper mounting plate and the lifting support together.

7. A lifting device according to claim 6, characterized in that: The through hole is a transversely opened oblong hole, the length of the oblong hole is C, the width of the oblong hole is B, and B=2R, R is the radius of the semicircle on both sides of the oblong hole; The distance between the limit plate and the outer plate is d1, and the distance between the limit plate and the inner plate is d2; The position of the threaded hole on the movable fixing plate must satisfy the following relationship: when the threaded hole is exactly at the center of the oblong hole on the inner side of the upper mounting plate, d1=d2; The range of position adjustment of the lifting support in the lateral direction is the adjustment amount of the oblong hole, and the adjustment amount must satisfy the following relationship: CB=d1+d2.

8. A lifting device according to claim 6, characterized in that: The limiting plate is an L-shaped plate, and the vertical plates in the L-shaped plates on both sides are used to limit the movement of the movable fixed plate in the longitudinal direction, and the horizontal plates and the upper mounting plate in the L-shaped plates on both sides are used to limit the movement of the movable fixed plate in the vertical direction; The surface of the movable fixing plate in contact with the upper mounting plate is a rough surface, and the surface of the movable fixing plate in contact with the horizontal plate in the L-shaped plate is a smooth surface.

9. A lifting device according to claim 1, characterized in that: An inner rib plate is welded at each end of the gap between the outer vertical plate and the inner vertical plate along the longitudinal direction; A plurality of outer ribs arranged at intervals along the longitudinal direction are welded at the connection between the upper mounting plate and the outer vertical plate.

10. A lifting device according to claim 1, characterized in that: The outer facade plate is provided with a plurality of through holes, and the periphery of the through holes is welded to the outer facade of the longitudinal beam; The inner vertical plate is provided with a plurality of through holes, and the peripheries of the through holes are welded to the inner vertical surfaces of the longitudinal beams.

11. A lifting device according to claim 1, characterized in that: The lifting support comprises: A pair of lifting plates that are opposite to each other and have an L-shaped structure, spanning the two longitudinal beams, and the transverse center line between the two lifting plates and the longitudinal center line between the two longitudinal beams are perpendicular to each other; A pair of mounting plates facing each other are respectively arranged at two lateral ends of the two lifting vertical plates, and the top surfaces of the mounting plates are welded to the bottom surfaces of the horizontal plates in the two corresponding lifting vertical plates; At least one reinforcing rib is welded between the vertical plates of the two lifting plates.

12. A mining dump truck, characterized in that: A lifting device comprising the lifting device according to any one of claims 1 to 11.

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