Rear hydro-pneumatic suspension system of off-highway mining dump truck

Abstract

The utility model discloses a rear hydro-pneumatic suspension system of an off-highway mining dump truck, which comprises a guide mechanism arranged between a welding frame of the off-highway mining dump truck and a middle drive axle and a rear drive axle, and further comprises a pair of suspension cylinder components which are respectively arranged on two sides of the welding frame. Each suspension cylinder assembly comprises a middle axle suspension cylinder corresponding to the middle drive axle, a rear axle suspension cylinder corresponding to the rear drive axle and an energy accumulator communicating the middle axle suspension cylinder with the rear axle suspension cylinder, and upper mounting points of each middle axle suspension cylinder and each rear axle suspension cylinder are hinged to the upper portion of the outer side wall of the welding frame; a lower mounting point of the middle axle suspension cylinder is hinged to the middle of the rear side wall of the middle drive axle, and a lower mounting point of the rear axle suspension cylinder is hinged to the middle of the rear side wall of the rear drive axle. The suspension cylinder has the advantages that the upper mounting points of the middle axle suspension cylinder and the rear axle suspension cylinder are mounted in the middle of the outer side wall of the welding frame, and compared with an existing suspension cylinder mounting mode, the stroke of the suspension cylinders is long, and the trafficability of a vehicle is good.

Description

Technical Field

[0001] The utility model relates to the field of off-road mining dump trucks, and more specifically, to a rear oil-gas suspension system of an off-road mining dump truck. Background Art

[0002] At present, the rear suspension system of off-road mining dump trucks mostly adopts a leaf spring + balanced suspension structure. This structure has the problems of weak load-bearing capacity, high failure rate, poor shock absorption and high maintenance cost. As the country has put forward the requirements of less manpower and intelligent mine safety in open-pit coal mines, transport vehicles need to have the basic requirements of large load-bearing capacity, long life and high reliability to meet the needs of "safe, green, efficient and intelligent" mine construction. Therefore, the leaf spring suspension structure is no longer applicable.

[0003] With the maturity of oil-gas spring resources and technology, the suspension structure of off-road mining dump trucks has begun to use oil-gas suspension structures on a large scale. However, in terms of my country's current national conditions, the demand for large-scale transportation equipment and the lack of "large-scale" transmission system resources in China have become the main contradiction in the large-scale development of domestic mining transportation equipment. Therefore, it is necessary to use a "small tonnage" double-drive axle single-side connected oil-gas suspension system to replace the "large tonnage" single-drive axle oil-gas suspension system to achieve the purpose of easy resource acquisition under the same load conditions. The existing "small tonnage" double-drive axle unilaterally connected oil-gas suspension system, such as the off-road dump truck suspension system disclosed in the patent with application number 201721628315.6, includes a middle drive axle, a rear drive axle, and an oil-gas suspension device. The oil-gas suspension device includes a middle axle suspension cylinder and a rear axle suspension cylinder respectively arranged on the middle drive axle and the rear drive axle, and an accumulator connecting the middle axle suspension cylinder and the rear axle suspension cylinder. However, the top ends of the middle axle suspension cylinder and the rear axle suspension cylinder of the patent are both arranged at the bottom of the welded frame, and the bottom ends are both installed on the rear side wall of the corresponding drive axle. With this design, the stroke of the suspension cylinder is small and the vehicle passability is poor. Utility Model Content

[0004] One object of the utility model is to solve at least the above-mentioned problems and provide a rear oil-gas suspension system for an off-road mining dump truck, which arranges the upper mounting points of the center axle suspension cylinder and the rear axle suspension cylinder on the upper part of the outer side wall of the welded frame. In actual use, compared with the existing installation method, without substantially changing the center of gravity of the suspension, the stroke of the center axle suspension cylinder and the rear axle suspension cylinder is extended, so that the vehicle has better passability, and avoids the situation where the axle is suspended and the suspension cylinders (the center axle suspension cylinder and the rear axle suspension cylinder) are compressed to the limit when passing through harsh working conditions, so that the axle and the welded frame are better stressed, and at the same time, the distance between a pair of center axle suspension cylinders and a pair of rear axle suspension cylinders is increased, which helps to improve the lateral stability of the suspension and the entire vehicle.

[0005] In order to achieve these purposes and other advantages according to the utility model, a rear oil-gas suspension system for an off-road mining dump truck is provided, including a guide mechanism arranged between a welded frame of the off-road mining dump truck and a middle drive axle and a rear drive axle, and also including:

[0006] A pair of suspension cylinder assemblies are arranged on both sides of the welded frame, each suspension cylinder assembly includes a middle bridge suspension cylinder corresponding to the middle drive axle, a rear axle suspension cylinder corresponding to the rear drive axle, and an accumulator connecting the middle bridge suspension cylinder and the rear axle suspension cylinder, the upper mounting point of each middle bridge suspension cylinder and each rear axle suspension cylinder is hinged to the upper part of the outer side wall of the welded frame, the lower mounting point of each middle bridge suspension cylinder is hinged to the middle part of the rear side wall of the corresponding middle drive axle, and the lower mounting point of each rear axle suspension cylinder is hinged to the middle part of the rear side wall of the corresponding rear drive axle.

[0007] Preferably, the upper mounting points of the mid-bridge suspension cylinder and the rear-bridge suspension cylinder are both mounted on the outer side wall of the welded frame via suspension cylinder supports, the suspension cylinder supports include a pair of inner ribs and a pair of outer ribs respectively arranged on both sides of the pair of inner ribs, the ears on the top of the mid-bridge suspension cylinder and the rear-bridge suspension cylinder are both extended between the corresponding pair of inner ribs and connected via pins, the lower parts of the pair of outer ribs are arranged on both sides of the corresponding cylinder barrels and the bottoms of the pair of inner ribs are higher than the top surfaces of the corresponding cylinder barrels.

[0008] Preferably, the shape of the side wall of the outer rib plate away from the welded frame is a vertical surface and a concave curved surface transitionally connected from top to bottom, and the concave curved surface forms a rounded corner.

[0009] Preferably, a pair of center axle suspension cylinders and a pair of rear axle suspension cylinders are arranged in an eight-shape, and the distance between the upper mounting points of a pair of center axle suspension cylinders and a pair of rear axle suspension cylinders is closer than the distance between the lower mounting points, and the angles between the center axle suspension cylinders and the rear axle suspension cylinders and the vertical line are 0° to 2°.

[0010] Preferably, the accumulator includes a closed and horizontal cylinder, in which a pair of pistons are slidably provided to separate the cylinder into a low-pressure chamber, an oil chamber and a high-pressure chamber in sequence, and limit pistons corresponding to the pair of pistons are provided at both ends of the oil chamber, and inflation ports are provided on the side walls opposite to the low-pressure chamber and the high-pressure chamber, and an oil filling port is provided on the oil chamber, and the oil filling port is connected to a four-way joint, and two valve ports of the four-way joint are respectively connected to the inside of the middle axle suspension cylinder and the rear axle suspension cylinder.

[0011] Preferably, the welded frame includes a pair of parallel longitudinal beams and a first crossbeam and a second crossbeam which are sequentially arranged between the pair of longitudinal beams from front to rear, and the height of the first crossbeam is lower than that of the second crossbeam; the guide mechanism includes a middle bridge A-type frame corresponding to the middle drive axle, a rear axle A-type frame corresponding to the rear drive axle, a middle bridge transverse thrust rod and a rear axle transverse thrust rod which are both arranged below the pair of longitudinal beams and arranged in a direction perpendicular to the pair of longitudinal beams, the tip of the middle bridge A-type frame is hinged to the first crossbeam, and the other two ends are fixedly connected to the front side wall of the middle drive axle, the tip of the rear axle A-type frame is hinged to the second crossbeam, and the other two ends are fixedly connected to the rear The front side wall of the drive axle is fixed; the distance between the ends on the same side of the middle axle A-frame is smaller than the distance between the two middle axle suspension cylinders, and the distance between the ends on the same side of the rear axle A-frame is smaller than the distance between the two rear axle suspension cylinders; one end of the middle axle lateral thrust rod and the rear axle lateral thrust rod are both hinged to the lower part of the same longitudinal beam, the other end of the middle axle lateral thrust rod is hinged to the top of the middle drive axle, and the other end of the rear axle lateral thrust rod is hinged to the top of the rear drive axle; when the vehicle is fully loaded, the middle axle lateral thrust rod and the rear axle lateral thrust rod are both at an angle of 3 to 8 degrees with the ground.

[0012] Preferably, it also includes a pair of limit blocks, a pair of limit blocks are vertically arranged below the welded frame and a pair of limit blocks are respectively arranged on the top of the middle drive axle and the rear drive axle; when the vehicle is in a fully loaded static balance state, there is a gap between the pair of limit blocks and the welded frame and the gap is smaller than the distance between the middle axle suspension cylinder and the rear axle suspension cylinder when they are compressed from the full load height to the shortest height.

[0013] The utility model at least has the following beneficial effects:

[0014] By arranging a guide mechanism, a middle axle suspension cylinder, a rear axle suspension cylinder and an accumulator, wherein the upper mounting points of the middle axle suspension cylinder and the rear axle suspension cylinder are both hinged to the upper part of the outer side wall of the welded frame, compared with the existing mounting method, under the condition that the center of gravity of the suspension is basically not changed, the stroke of the middle axle suspension cylinder and the rear axle suspension cylinder is extended, so that the vehicle has better passability, and it is avoided that the axle is suspended and the suspension cylinders (middle axle suspension cylinder and rear axle suspension cylinder) are compressed to the limit when passing through harsh working conditions, so that the force on the axle and the welded frame is better, and at the same time, the distance between a pair of middle axle suspension cylinders and a pair of rear axle suspension cylinders is increased, which helps to improve the lateral stability of the suspension and the whole vehicle.

[0015] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through research and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A three-dimensional diagram of a rear oil-gas suspension system of an off-road mining dump truck according to one of the technical solutions of the utility model;

[0017] Figure 2 This is a front view of the rear oil-gas suspension system of an off-road mining dump truck according to one of the technical solutions of the utility model;

[0018] Figure 3 A top view of a rear oil-gas suspension system of an off-road mining dump truck according to one of the technical solutions of the utility model;

[0019] Figure 4 It is a side view of the rear oil-gas suspension system of an off-road mining dump truck according to one of the technical solutions of the utility model;

[0020] Figure 5 Another stereoscopic view of the rear oil-gas suspension system of an off-road mining dump truck according to one of the technical solutions of the utility model;

[0021] Figure 6 for Figure 2 The enlarged schematic diagram at A in the middle;

[0022] Figure 7 This is a front view of the middle bridge suspension cylinder support described in one of the technical solutions of the utility model;

[0023] Figure 8 It is a side view of the middle bridge suspension cylinder support described in one of the technical solutions of the utility model;

[0024] Fig. 9 This is a schematic diagram of the structure of the accumulator described in one of the technical solutions of the utility model.

[0025] Figure numerals: 100-welded frame; 200-middle drive axle; 300-rear drive axle; 1-middle axle suspension cylinder support; 2-rear axle suspension cylinder support; 3-middle axle suspension cylinder; 4-rear axle suspension cylinder; 5-middle axle A-frame; 6-rear axle A-frame; 7-hydraulic oil pipe; 8-accumulator; 9-four-way joint; 10-middle axle push support; 11-first crossbeam; 12-second crossbeam; 13-middle axle Transverse thrust rod; 14-rear axle transverse thrust rod; 15-rear axle transverse thrust support; 16-limiting block; 17-outer rib plate; 18-inner rib plate; 19-cover plate; 20-bottom plate; 21-low-pressure air chamber; 22-high-pressure air chamber; 23-low-pressure chamber piston; 24-cylinder; 25-oil filling port; 26-oil chamber; 27-charging valve; 28-high-pressure chamber piston; 29-plug; 30-straight-through connector. DETAILED DESCRIPTION

[0026] The present invention will be described in further detail below in conjunction with the accompanying drawings so that those skilled in the art can implement the invention with reference to the description.

[0027] It should be understood that terms such as “having”, “including” and “comprising” used herein do not exclude the existence or addition of one or more other elements or combinations thereof.

[0028] like Figure 1-9 As shown, the utility model provides a rear oil-gas suspension system for an off-road mining dump truck, including a guide mechanism disposed between a welded frame 100 of the off-road mining dump truck and a middle drive axle 200 and a rear drive axle 300, and also includes:

[0029] A pair of suspension cylinder assemblies, which are arranged on both sides of the welded frame 100, each suspension cylinder assembly includes a middle bridge suspension cylinder 3 corresponding to the middle drive axle 200, a rear axle suspension cylinder 4 corresponding to the rear drive axle 300, and an accumulator 8 connecting the middle bridge suspension cylinder 3 and the rear axle suspension cylinder 4, the upper mounting point of each middle bridge suspension cylinder 3 and each rear axle suspension cylinder 4 are hinged to the upper part of the outer side wall of the welded frame 100, the lower mounting point of each middle bridge suspension cylinder 3 is hinged to the middle part of the rear side wall of the corresponding middle drive axle 200, and the lower mounting point of each rear axle suspension cylinder 4 is hinged to the middle part of the rear side wall of the corresponding rear drive axle 300;

[0030] In the above technical scheme, the off-road mining dump truck includes a frame and a middle drive axle 200 and a rear drive axle 300 arranged below the vehicle. The guide mechanism connects the middle drive axle 200 and the frame and connects the rear drive axle 300 and the frame to provide a guide for the vehicle to travel. Both ends of the middle drive axle 200 are provided with a middle bridge suspension cylinder 3. The lower mounting point of the middle bridge suspension cylinder 3 is hinged to the rear side wall of the middle drive axle 200 (the rear side wall refers to the rear end side wall along the driving direction) through a joint bearing, and the upper mounting point is hinged to the upper part of the outer side wall of the frame (the outer side wall refers to the side wall of the frame away from the inside and the length direction of the side wall is consistent with the driving direction of the vehicle). Similarly, the lower mounting point of the rear axle suspension cylinder 4 is hinged to the rear side wall of the rear drive axle 300 through a joint bearing, and the upper mounting point is hinged to the upper part of the outer side wall of the frame;

[0031] In this technical solution, when actually used, the guide mechanism provides a guide for the vehicle's travel, and the middle axle suspension cylinder 3, the rear axle suspension cylinder 4 and the accumulator 8 provide support and adjustment capabilities for the balance and stability of the rear oil-gas suspension system.

[0032] The technical solution has the beneficial effect of providing a guiding mechanism, a middle axle suspension cylinder 3, a rear axle suspension cylinder 4, and an accumulator 8, wherein the upper mounting points of the middle axle suspension cylinder 3 and the rear axle suspension cylinder 4 are hinged to the upper portion of the outer wall of the welded frame 100. Compared with the existing mounting method, the stroke of the middle axle suspension cylinder 3 and the rear axle suspension cylinder 4 is extended without substantially changing the center of gravity of the suspension, thereby improving the vehicle's passability and avoiding the situation in which the axle is suspended in the air and the suspension cylinders (the middle axle suspension cylinder 3 and the rear axle suspension cylinder 4) are compressed to the limit when passing through harsh working conditions, thereby improving the stress on the axle and the welded frame 100, and at the same time increasing the distance between a pair of middle axle suspension cylinders 3 and a pair of rear axle suspension cylinders 4, thereby helping to improve the lateral stability of the suspension and the entire vehicle.

[0033] In another technical solution, the upper mounting points of the middle bridge suspension cylinder 3 and the rear bridge suspension cylinder 4 are both mounted on the outer side wall of the welded frame 100 through a suspension cylinder support, and the suspension cylinder support includes a pair of inner ribs 18 and a pair of outer ribs 17 respectively arranged on both sides of the pair of inner ribs 18, and the ears on the top of the middle bridge suspension cylinder 3 and the rear bridge suspension cylinder 4 are both extended between the corresponding pair of inner ribs 18 and connected through a pin shaft, and the lower parts of the pair of outer ribs 17 are arranged on both sides of the corresponding cylinder barrels and the bottoms of the pair of inner ribs 18 are higher than the top surfaces of the corresponding cylinder barrels;

[0034] In the above technical solution, specifically, the suspension cylinder support includes a bottom plate 20 vertically arranged on the outer side wall of the welded frame 100, a cover plate 19 horizontally welded on the bottom plate 20, a pair of inner ribs 18 and a pair of outer ribs 17 arranged below the cover plate 19, the pair of outer ribs 17 are arranged on both sides of the pair of inner ribs 18, the pair of outer ribs 17 and the pair of inner ribs 18 are connected to the bottom plate 20, the cylinder diameters of the middle bridge suspension cylinder 3 and the rear bridge suspension cylinder 4 are smaller than the distance between the corresponding pair of inner ribs 18 and smaller than the distance between the corresponding pair of outer ribs 17, and the bottom of the outer rib 17 extends to the lower part of the outer side wall of the frame; the middle bridge suspension cylinder 3 corresponds to the middle bridge suspension cylinder support 1 The rear axle suspension cylinder 4 corresponds to the rear axle suspension cylinder support 2, and the cover plate 19 adopts a "treasure cover head" structure. The two ends of the "treasure cover head" shaped cover plate 19 extend along the middle of the welded frame 100. When welding is adopted, the welding stress is effectively reduced and the reliability is improved. The lower part of the cover plate 19 adopts a four-rib plate structure (a pair of inner rib plates 18 and a pair of outer rib plates 17, the thickness of the outer rib plates 17 is preferably 40mm, and the thickness of the inner rib plates 18 is preferably 30mm), and in the width direction: the outer installation width of the two inner rib plates 18 is smaller than the diameter of the suspension cylinder barrel, and the inner installation width of the two outer rib plates 17 is larger than the barrel diameter of the suspension cylinder, which can prevent the suspension cylinder and the suspension cylinder support from interfering.

[0035] In another technical solution, the shape of the side wall of the outer rib plate 17 away from the welded frame 100 is a vertical surface and a concave curved surface that transition from top to bottom, and the concave curved surface forms a fillet; specifically, the fillet is a large fillet. In actual use, the bottom of the outer rib plate (that is, the height in the vertical direction) is designed to extend to the lower part of the outer wall of the welded frame 100. The thickness of the outer rib plate is preferably 40 mm. Such a design greatly reduces the stress of the two outer rib plates 17 on the outside of the two suspension cylinder supports, and the reliability of the welded frame 100 and the two suspension cylinder supports is effectively guaranteed; it should be noted that a pair of inner rib plates 18 of the mid-bridge suspension cylinder support 1 and the rear-bridge suspension cylinder support 2 are symmetrical about the vertical axis and a pair of outer rib plates 17 are symmetrical about the vertical axis, and the two vertical axes are the same vertical axis. The shape of the bottom plate 20 is set according to the actual structure and is not limited here.

[0036] In another technical solution, a pair of center bridge suspension cylinders 3 and a pair of rear bridge suspension cylinders 4 are arranged in an "eight" shape, and the distance between the upper mounting points of the pair of center bridge suspension cylinders 3 and the pair of rear bridge suspension cylinders 4 is closer than the distance between the lower mounting points. The angles between the center bridge suspension cylinders 3 and the rear bridge suspension cylinders 4 and the vertical line are 0° to 2°, and preferably the angle is 1°. Since the upper and lower articulations of the suspension cylinders are connected by joint bearings, the joint bearings can well convert lateral forces into vertical forces. The small-angle arrangement of the suspension cylinders will not cause oil leakage caused by the lateral forces borne by the seals of the suspension cylinders. Therefore, the suspension cylinders are arranged in an "eight" shape, which can effectively ensure the stability of the suspension. At the same time, the closer the upper hinge point of the suspension cylinder is to the inner side of the welded frame 100, the shorter the force arm is. Therefore, the bending moment received by the suspension cylinder will be greatly reduced, thereby greatly improving the life of the frame.

[0037] In another technical solution, the accumulator 8 includes a closed and horizontal cylinder 24, a pair of pistons are slidably arranged in the cylinder 24 to sequentially divide the cylinder 24 into a low-pressure chamber, an oil chamber 26 and a high-pressure chamber, both ends of the oil chamber 26 are provided with limit pistons corresponding to the pair of pistons respectively, and the side walls of the low-pressure chamber and the high-pressure chamber facing away from each other are provided with charging ports, and the oil chamber 26 is provided with an oil filling port 25, and the oil filling port 25 is connected to a four-way joint 9, and two valve ports of the four-way joint 9 are respectively connected to the inside of the middle axle suspension cylinder 3 and the rear axle suspension cylinder 4;

[0038] In the above technical solution, the accumulator 8 includes a cylinder 24 that is closed at both ends and horizontal, a blocking block is provided on the inner bottom wall of the cylinder 24, and steps are formed at both ends of the blocking block along the axial direction of the cylinder, a pair of pistons are slidably provided in the cylinder 24, a pair of pistons corresponds to a pair of steps, and the steps block the corresponding pistons from continuing to move, and the pair of pistons and the blocking block divide the cylinder 24 into a low-pressure air chamber 21, an oil chamber 26 and a high-pressure air chamber 22 in sequence, the low-pressure chamber piston 23 is located in the low-pressure air chamber 21, and the piston located in the high-pressure air chamber 22 is the high-pressure chamber piston 28, wherein the steps are provided on the inner wall of the oil chamber 26, and the top and bottom of the oil chamber 26 are provided with There is an oil filling port 25, and inflation ports are provided on the side walls opposite to the low-pressure air chamber 21 and the high-pressure air chamber 22. Each inflation port is provided with an inflation valve 27. The oil filling port 25 at the top of the oil chamber 26 is connected to the four-way joint 9 through a straight joint 30, and the oil filling port 25 at the bottom is blocked by a sealing head for standby use. The interfaces on the front and rear sides of the four-way joint 9 are respectively connected to the middle bridge suspension cylinder 3 and the rear bridge suspension cylinder 4 through the hydraulic oil pipe 7. The interface at the top of the four-way joint 9 is blocked with a plug 29. The installation height of the four-way joint 9 is higher than the top of the internal cavity of the middle bridge suspension cylinder 3 and the top of the internal cavity of the rear bridge suspension cylinder 4, and the accumulator 8 is arranged horizontally;

[0039] When such a technical solution is used, in the initial state, the low-pressure air chamber 21 and the high-pressure air chamber 22 of the accumulator 8 are respectively filled with nitrogen of different pressures. At this time, due to the pressure in the low-pressure air chamber 21 and the high-pressure air chamber 22 of the accumulator 8, the gas will respectively push the low-pressure chamber piston 23 and the high-pressure chamber piston 28 to move, and finally the low-pressure chamber piston 23 and the high-pressure chamber piston 28 of the accumulator 8 will move to a pair of steps. At this time, the oil chamber 26 is between the low-pressure chamber piston 23 and the high-pressure chamber piston 28; the next step is to open the plug 29 above the accumulator 8 to add hydraulic oil into the system. At this time, the oil will fill the inside of the middle axle suspension cylinder 3 cavity, the inside of the rear axle suspension cylinder 4 cavity and the entire connected pipeline. When the oil is full, the air will be discharged to the outside of the system; when the vehicle is in an unloaded state In the unloaded state, the piston rods of the middle axle suspension cylinder 3 and the rear axle suspension cylinder 4 will be compressed, and the oil inside the two suspension cylinders will push the low-pressure chamber piston 23 to move and occupy the volume originally belonging to the low-pressure air chamber 21 of the accumulator 8. In this process, since the gas pressure filled in the high-pressure air chamber 22 of the accumulator 8 is much greater than the pressure of the system when it is unloaded, the high-pressure chamber piston 28 will not move in any posture under the unloaded state; when the vehicle is in the fully loaded state, the piston rods of the two suspension cylinders will be further compressed. At this time, the pressure brought by the weight of the cargo is greater than or equal to the pressure of the low-pressure air chamber 21 of the accumulator 8, and is also greater than the pressure of the high-pressure air chamber 22 of the accumulator 8. Therefore, the oil inside the two suspension cylinders will push the low-pressure chamber piston 23 to move, and will also push the high-pressure chamber piston 28 to move.

[0040] Under this structural design, when the vehicle is unloaded, only the low-pressure air chamber 21 of the accumulator 8 participates in the work, and the suspension stiffness is small and the frequency deviation is low, which can achieve the effect of vibration reduction. When the vehicle is fully loaded, the high-pressure air chamber 22 of the accumulator 8 will participate in the work, meeting the requirement of heavy load. At the same time, in this state, the high-pressure air chamber 22 of the accumulator 8 and the high-pressure air chamber 22 of the accumulator 8 participate in the work together, which is equivalent to increasing the total volume of the air chamber. The frequency deviation of the suspension can still be maintained at a relatively low state. The structure is reasonable.

[0041] In another technical solution, the welded frame 100 includes a pair of parallel longitudinal beams and a first crossbeam 11 and a second crossbeam 12 arranged between the pair of longitudinal beams from front to rear, wherein the height of the first crossbeam 11 is lower than that of the second crossbeam 12; the guide mechanism includes a middle bridge A-frame 5 corresponding to the middle drive axle 200, a rear axle A-frame 6 corresponding to the rear drive axle 300, a middle bridge transverse thrust rod 13 and a rear axle transverse thrust rod 14, both of which are arranged below the pair of longitudinal beams and along a direction perpendicular to the pair of longitudinal beams, the tip of the middle bridge A-frame 5 is hinged to the first crossbeam 11, and the other two ends are fixedly connected to the front side wall of the middle drive axle 200, and the tip of the rear axle A-frame 6 is hinged to the second crossbeam 12. , the other two ends are fixedly connected to the front side wall of the rear drive axle 300; the distance between the two ends on the same side of the middle bridge A-frame 5 is smaller than the distance between the two middle bridge suspension cylinders 3, and the distance between the two ends on the same side of the rear bridge A-frame 6 is smaller than the distance between the two rear bridge suspension cylinders 4; one end of the middle bridge transverse thrust rod 13 and the rear bridge transverse thrust rod 14 are both hinged to the lower part of the same longitudinal beam, the other end of the middle bridge transverse thrust rod 13 is hinged to the top of the middle drive axle 200, and the other end of the rear bridge transverse thrust rod 14 is hinged to the top of the rear drive axle 300; when the vehicle is fully loaded, the middle bridge transverse thrust rod 13 and the rear bridge transverse thrust rod 14 are both at an angle of 3 to 8 degrees with the ground;

[0042] In the above technical scheme, the first crossbeam 11 is located below the vehicle frame and connected to the vehicle frame through a bracket, and the second crossbeam 12 is arranged between the side walls of a pair of longitudinal beams of the workshop that are close to each other; the middle bridge transverse thrust rod 13 is parallel to the rear bridge transverse thrust rod 14; the head (i.e., the tip) of the middle bridge A-frame 5 is hinged to the first crossbeam 11 through a joint bearing, and the tail (i.e., the two ends in the same direction) of the middle bridge A-frame 5 is bolted to the mounting surface of the front end of the middle drive axle 200 (the front end is the front end along the driving direction); the head (i.e., the tip) of the rear axle A-frame 6 is hinged to the second crossbeam 12 through a joint bearing, and the tail (i.e., the two ends in the same direction) of the rear axle A-frame 6 is bolted to the mounting surface of the front end of the rear drive axle 300. When the vehicle moves forward or backward, the two axles (middle axle) are connected to the front end of the rear axle 300. The driving axle 200 and the rear driving axle 300) transmit the driving force or braking force to the welded frame 100 through the A-frame (the middle axle A-frame 5 and the rear axle A-frame 6) respectively. When the vehicle passes through an uneven road surface, the middle driving axle 200 rotates around the hinge point of the head of the middle axle A-frame 5, and the rear driving axle 300 rotates around the hinge point of the head of the rear axle A-frame 6, ensuring a correct posture of the axle and the suspension. It is not difficult to find that the actual movement trajectory of the middle driving axle 200 is a circle with the head of the middle axle A-frame 5 as the center and the hinge point of the middle axle A-frame 5 to the lower hinge point of the middle axle suspension cylinder 3 as the radius, and the middle axle suspension cylinder support 1 The hinge point is the center and the hinge point of the middle axle suspension cylinder support 1 is the radius. The hinge point to the lower hinge point of the middle axle suspension cylinder 3 is the radius.

[0043] In addition, a middle bridge lateral thrust support 10 and a rear bridge lateral thrust support 15 are respectively provided at the lower part of the inner side wall of one of the longitudinal beams (the inner side wall is only close to the side wall of the other longitudinal beam), one end of the middle bridge lateral thrust rod 13 is hinged to the middle bridge lateral thrust support 10, and the other end is hinged to the top of the middle drive axle 200, one end of the rear axle lateral thrust rod 14 is hinged to the rear axle lateral thrust support 15, and the other end is hinged to the top of the rear drive axle 300. When the vehicle is fully loaded, the middle bridge lateral thrust rod 13 and the rear axle lateral thrust rod 14 are both at an angle of 3 to 8 with the ground. Degrees, preferably the angle is 7 degrees. Such a design takes the middle drive axle 200 as an example: when the vehicle turns or the left and right wheels of the vehicle pass obstacles of different heights, the middle drive axle 200 rotates around the hinge point of the middle bridge lateral thrust rod 13 and the middle bridge lateral thrust support 10 connected thereto as the center of the circle, and the distance from the hinge point to the hinge point on the middle bridge lateral thrust rod 13 and the middle drive axle 200 is the radius. When the middle bridge lateral thrust rod 13 is fully loaded, the smaller the arrangement angle is, the smaller the left and right swing amount of the middle drive axle 200 is, which has excellent promotion significance.

[0044] In another technical solution, it also includes a pair of limit blocks 16, which are vertically arranged below the welded frame 100 and are respectively arranged on the top of the middle drive axle 200 and the rear drive axle 300; when the vehicle is in a fully loaded static balance state, there is a gap between the pair of limit blocks 16 and the welded frame 100 and the gap is smaller than the distance from the full load height to the shortest height when the middle bridge suspension cylinder 3 and the rear bridge suspension cylinder 4 are compressed. Such a design will not cause poor comfort and poor passability caused by frequent collisions between the welded frame 100 and the limit blocks 16. At the same time, it can ensure that the middle bridge suspension cylinder 3 and the rear bridge suspension cylinder 4 will not be compressed to the limit, resulting in the middle bridge suspension cylinder 3 and the rear bridge suspension cylinder 4 compressing the top cylinder and causing the piston rod of the middle bridge suspension cylinder 3 and the rear bridge suspension cylinder 4 to bend, and the frame will be cracked due to single-point force, further ensuring the lateral stability of the vehicle, preventing the vehicle from rolling over, reducing frame cracking, and meeting the "safe, green, efficient and intelligent" mining construction requirements.

[0045] The number of equipment and processing scale described here are used to simplify the description of the utility model. The application, modification and variation of the rear oil-gas suspension system of the utility model off-road mining dump truck are obvious to those skilled in the art.

[0046] Although the implementation scheme of the utility model has been disclosed as above, it is not limited to the applications listed in the specification and implementation modes. It can be fully applied to various fields suitable for the utility model. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the utility model is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A rear oil-gas suspension system for an off-road mining dump truck, comprising a guide mechanism disposed between a welded frame of the off-road mining dump truck and a middle drive axle and a rear drive axle, characterized in that: Also includes: A pair of suspension cylinder assemblies are arranged on both sides of the welded frame, each suspension cylinder assembly includes a middle bridge suspension cylinder corresponding to the middle drive axle, a rear axle suspension cylinder corresponding to the rear drive axle, and an accumulator connecting the middle bridge suspension cylinder and the rear axle suspension cylinder, the upper mounting point of each middle bridge suspension cylinder and each rear axle suspension cylinder is hinged to the upper part of the outer side wall of the welded frame, the lower mounting point of each middle bridge suspension cylinder is hinged to the middle part of the rear side wall of the corresponding middle drive axle, and the lower mounting point of each rear axle suspension cylinder is hinged to the middle part of the rear side wall of the corresponding rear drive axle.

2. The off-road mining dump truck rear oil-gas suspension system according to claim 1, characterized in that: The upper mounting points of the mid-bridge suspension cylinder and the rear-bridge suspension cylinder are both mounted on the outer side wall of the welded frame via suspension cylinder supports, the suspension cylinder supports include a pair of inner rib plates and a pair of outer rib plates respectively arranged on both sides of the pair of inner rib plates, the ears on the top of the mid-bridge suspension cylinder and the rear-bridge suspension cylinder are both extended between the corresponding pair of inner rib plates and connected via pins, the lower parts of the pair of outer rib plates are arranged on both sides of the corresponding cylinder barrels and the bottoms of the pair of inner rib plates are higher than the top surfaces of the corresponding cylinder barrels.

3. The off-road mining dump truck rear oil-gas suspension system according to claim 2, characterized in that: The shape of the side wall of the outer rib plate away from the welded frame is a vertical surface and a concave curved surface transitionally connected from top to bottom, and the concave curved surface forms a rounded corner.

4. The off-road mining dump truck rear oil-gas suspension system according to claim 2, characterized in that: A pair of center axle suspension cylinders and a pair of rear axle suspension cylinders are arranged in an eight-shaped shape, and the distance between the upper mounting points of the pair of center axle suspension cylinders and the pair of rear axle suspension cylinders is closer than the distance between the lower mounting points, and the angles between the center axle suspension cylinders and the rear axle suspension cylinders and the vertical line are 0° to 2°.

5. The off-road mining dump truck rear oil-gas suspension system according to claim 1, characterized in that: The accumulator includes a closed and horizontal cylinder, in which a pair of pistons are slidably arranged to separate the cylinder into a low-pressure chamber, an oil chamber and a high-pressure chamber in sequence, and limit pistons corresponding to the pair of pistons are arranged at both ends of the oil chamber. The low-pressure chamber and the high-pressure chamber are provided with inflation ports on the side walls opposite to each other, and the oil chamber is provided with an oil filling port, which is connected to a four-way joint, and two valve ports of the four-way joint are respectively connected to the inside of the middle axle suspension cylinder and the rear axle suspension cylinder.

6. The off-road mining dump truck rear oil-gas suspension system according to claim 4, characterized in that: The welded frame includes a pair of parallel longitudinal beams and a first crossbeam and a second crossbeam arranged between the pair of longitudinal beams from front to rear, wherein the height of the first crossbeam is lower than that of the second crossbeam; the guide mechanism includes a middle bridge A-type frame corresponding to the middle drive axle, a rear axle A-type frame corresponding to the rear drive axle, a middle bridge transverse thrust rod and a rear axle transverse thrust rod, both of which are arranged below the pair of longitudinal beams and along a direction perpendicular to the pair of longitudinal beams, wherein the tip of the middle bridge A-type frame is hinged to the first crossbeam, and the other two ends are fixedly connected to the front side wall of the middle drive axle, the tip of the rear axle A-type frame is hinged to the second crossbeam, and the other two ends are fixedly connected to the rear drive axle The front side wall of the bridge is fixed; the distance between the ends on the same side of the middle bridge A-frame is smaller than the distance between the two middle bridge suspension cylinders, and the distance between the ends on the same side of the rear bridge A-frame is smaller than the distance between the two rear bridge suspension cylinders; one end of the middle bridge lateral thrust rod and the rear axle lateral thrust rod are both hinged to the lower part of the same longitudinal beam, the other end of the middle bridge lateral thrust rod is hinged to the top of the middle drive axle, and the other end of the rear axle lateral thrust rod is hinged to the top of the rear drive axle; when the vehicle is fully loaded, the middle bridge lateral thrust rod and the rear axle lateral thrust rod are both at an angle of 3 to 8 degrees with the ground.

7. The off-road mining dump truck rear oil-gas suspension system according to claim 6, characterized in that: It also includes a pair of limit blocks, which are vertically arranged below the welded frame and respectively arranged on the top of the middle drive axle and the rear drive axle; when the vehicle is in a fully loaded static balance state, there is a gap between the pair of limit blocks and the welded frame and the gap is smaller than the distance between the middle axle suspension cylinder and the rear axle suspension cylinder when they are compressed from the full load height to the shortest height.

Images