Comprehensive test bed and test method for front suspension device of mining dump truck

Abstract

The invention discloses a comprehensive test bench for a front suspension device of a mining dump truck and a test method. The comprehensive test bench comprises a supporting bench, a first structural frame, a first loading execution mechanism, a second structural frame, a second loading execution mechanism, a horizontal bench, a seesaw device, a third structural frame and a third loading execution mechanism. A to-be-tested front suspension oil cylinder and a front wheel assembly are fixed through a supporting rack, the supporting rack is connected with a loading execution mechanism fixed on three groups of frames with different structures, and the front suspension oil cylinder is simulated to be subjected to three loads, namely a vertical load, a horizontal load and a turning (steering) load through the loading execution mechanism; and efficient laboratory research, parameter determination and quality assurance test can be carried out on the newly developed and designed front suspension oil cylinder in a short time.

Description

Technical Field

[0001] The invention relates to a comprehensive test bench for a front suspension device of a mining dump truck, belonging to the technical field of mining dump trucks. Background Art

[0002] The suspension device is one of the important systems of the mining electric wheel dump truck, and is the assembly of the force transmission connection device between the frame and the axle (wheel). The suspension device elastically connects the frame with the axle and the wheel, transmits the force and torque acting between the wheel and the frame, alleviates the impact load transmitted to the frame by the road surface, and attenuates the vibration caused by it, so that the wheel has ideal movement characteristics when it is on uneven road surface and load changes, ensuring the smoothness of driving and handling stability.

[0003] The front suspension cylinder is subjected to triple loads, namely vertical, horizontal and turning (steering) loads. As a key core component, it needs to be rigorously verified by experiments. Traditional test equipment can only perform simple air tightness tests and stroke tests. A few test benches can load simple vertical loads. It is very difficult to simulate multiple loads of actual working conditions in the laboratory. Therefore, various suspension cylinder performance tests are usually carried out on the whole vehicle in the test field, which requires the use of the entire vehicle machine, consuming a lot of time, manpower and energy, resulting in huge development and testing investment, long cycle, and high maintenance and use costs. In addition, the whole vehicle experiment is limited by the site and season. It is difficult to conduct temperature environment experiments on the suspension cylinder. The high temperature performance of the seal and the dust experiment of the parts are heavily dependent on environmental factors and cannot be well verified by experiments. In the whole vehicle experiment, a few overload working condition experiments will cause serious damage to other parts of the whole vehicle, resulting in huge expenses.

[0004] Traditionally, newly developed suspension cylinders are assembled into complete vehicles and then tested in a test field to measure their performance parameters. If the test results do not meet the requirements of the entire vehicle, the design and manufacturing will need to be revised, which will affect the overall progress of vehicle research and development and seriously affect the vehicle's market launch plan.

[0005] In order to solve the above problems of testing newly developed and designed suspension cylinders, the present invention designs a comprehensive test bench for the front suspension device of a mining dump truck, which enables efficient laboratory research and quality assurance testing in a short period of time before the final experimental evaluation of the new vehicle in the test field. Summary of the invention

[0006] The present invention provides a comprehensive test bench for the front suspension device of a mining dump truck. The front suspension cylinder and the front wheel assembly to be tested are fixed by a support bench and connected to loading actuators fixed on three groups of different structural frames. The loading actuators are used to simulate the front suspension cylinder being subjected to triple loads in vertical, horizontal and turning (steering), so that efficient laboratory research, parameter measurement and quality assurance testing of the newly developed and designed front suspension cylinder can be carried out in a short period of time.

[0007] The present invention is implemented according to the following technical solutions:

[0008] In a first aspect, the present invention provides a comprehensive test bench for a front suspension device of a mining dump truck, comprising:

[0009] Support stand, used to install the tested front suspension cylinder and front wheel assembly;

[0010] A structural frame 1, the top of which is fixed on the support frame, and a loading actuator 1 is installed at the top, the loading actuator 1 acts on the top of the cylinder barrel of the suspension cylinder under test, and transmits the rotation load of the loading actuator 1 to the cylinder barrel of the suspension cylinder;

[0011] A seesaw device is arranged below the tested front suspension cylinder and front wheel assembly;

[0012] A horizontal platform frame, installed on the seesaw device, used to install and fix the tested front suspension cylinder and front wheel assembly;

[0013] A structural frame 3, on which a loading actuator 3 arranged in a vertical direction is provided, wherein the loading actuator 3 applies a vertical load to the seesaw device, and transmits the vertical load of the loading actuator 3 to the horizontal platform frame;

[0014] The second structural frame is connected to a second loading actuator arranged horizontally. The second loading actuator applies a horizontal load on the horizontal platform frame, and the push-pull horizontal platform frame moves horizontally on the seesaw device to transfer the horizontal load of the second loading actuator to the horizontal platform frame.

[0015] In some embodiments, the structural frame 1 comprises:

[0016] Support columns, fixed on the horizontal ground;

[0017] A bracket 1 is fixed on the top surface of the support column, and a hinge seat for assembling a loading actuator 1 is installed on the bracket 1;

[0018] Bracket 2 is fixed on the side elevation of bracket 1 and is used to be fixed together with the support frame;

[0019] Bracket three is fixed on the side elevation of the support column located below bracket two. Bracket three is provided with two sets of hinge holes, which are respectively used to hinge and fix connecting rod one and connecting rod two of the tested front suspension cylinder and front wheel assembly.

[0020] In some embodiments, after the outer end hinge holes on connecting rod one and connecting rod two are aligned with the corresponding hinge holes on bracket three, the pins with ear plates fixed on the two ends are respectively inserted into the corresponding aligned hinge holes, and then connecting rod one and connecting rod two are hinged together with bracket three; the ear plate is provided with a notch or a through hole, and the ear plate is fixed to bracket three after the screw passes through the notch or the through hole, thereby axially limiting the pin.

[0021] In some embodiments, one end of the loading actuator 1 is hinged to the structural frame 1, and the other end is connected to the top end of the tested front suspension cylinder barrel through a connecting rod assembly; the connecting rod assembly includes:

[0022] The fixed vertical plate is provided with a row of spaced mounting holes at the vertical edges on both sides thereof, and is used to mount the tested front suspension oil cylinders of different specifications through fasteners; the fixed vertical plate is provided with two spaced ear plates on the side surface facing away from the tested front suspension oil cylinder;

[0023] A connecting rod with threads at both ends is inserted into through holes coaxially arranged in the upper and lower ear plates, and the connecting rod is fixed to the two ear plates by fastening with two nuts arranged up and down. The other end of the loading actuator is hinged on the connecting rod.

[0024] In some embodiments, the structural frame three includes an n-type support frame and a frame-type mounting frame fixed on the cross beam of the n-type support frame; the n-type support frame is fixed on the horizontal ground, the top of the loading actuator three is installed on the frame-type mounting frame, and the bottom of the loading actuator three is hinged to the seesaw device to provide a vertical downward pressing force or a vertical upward lifting force to the seesaw device.

[0025] In some embodiments, the seesaw device comprises:

[0026] A U-shaped support frame with a pair of coaxial reamed holes, fixed on the horizontal ground;

[0027] The seesaw beam is arranged in the U-shaped support frame and is hinged to the U-shaped support frame through pins on both sides. One end face of the seesaw beam is three-phase hinged to the loading actuator, and the other end face of the seesaw beam is installed with the horizontal platform frame capable of horizontal movement thereon.

[0028] In some embodiments, the seesaw beam is provided with an earring on one end face along its length direction, and is hinged with the loading actuator through a pin shaft in three phases; the seesaw beam is provided with a U-shaped groove with an upward opening and running through the entire width on the other end face along its length direction, and a groove-type track extending along the width direction is provided on the bottom face of the U-shaped groove, which is used to guide and limit the horizontal movement of the horizontal platform frame.

[0029] In some embodiments, the horizontal platform frame includes:

[0030] An I-shaped support frame, the bottom surface of which is provided with a plurality of roller seats, each of which is provided with a roller via a pin shaft, and the roller can move horizontally on the grooved track on the seesaw device;

[0031] The mounting platform is composed of a bottom plate and an annular side plate surrounding the periphery of the bottom plate and extending vertically upward therefrom, the bottom plate is fixed on the top surface of the I-shaped support frame, and the mounting platform is used to install and fix the tested front suspension cylinder and front wheel assembly;

[0032] The pull plate is fixed on the side elevation of the I-shaped support frame and is used to be hinged together with the connecting rod assembly connected to the second loading actuator.

[0033] In some embodiments, the structural frame 2 includes:

[0034] I-shaped support frame, fixed on the horizontal ground;

[0035] The first articulated seat is fixed on the top surface of the I-shaped support frame. One end of the loading actuator 2 is articulated with the first articulated seat, and the other end is articulated with the horizontal platform frame through a connecting rod assembly.

[0036] In some embodiments, the connecting rod assembly includes:

[0037] A second hinged seat is fixed on the horizontal ground between the second structural frame and the horizontal platform frame;

[0038] A connecting vertical plate with three hinge points, wherein the bottom hinge point is hinged to the hinge seat in two phases through a pin, and the middle hinge point is hinged to the loading actuator in two phases through a pin;

[0039] A connecting rod, one end of which is hinged to the top hinge point of the connecting vertical plate through a pin shaft, and the other end of which is hinged to the horizontal platform frame.

[0040] In some embodiments, the loading actuator 1, the loading actuator 2, and the loading actuator 3 are all hydraulic cylinders composed of an oil cylinder, a piston rod, and at least one hinged connection end.

[0041] In some embodiments, the tested front suspension cylinder and front wheel assembly include a front suspension cylinder barrel, a front suspension cylinder piston rod, a front wheel assembly, connecting rod one and connecting rod two; the front suspension cylinder barrel and the front suspension cylinder piston rod are assembled and connected, and the two can be relatively telescopic and rotatable, the front suspension cylinder piston rod is installed and fixed on the front wheel assembly, and connecting rod one and connecting rod two are respectively hinged on the front wheel assembly.

[0042] In a second aspect, the present invention provides a test method based on the above-mentioned comprehensive test bench for the front suspension device of a mining dump truck, the test method comprising the following steps:

[0043] Step 1: Place the front suspension device of the dump truck on the comprehensive test bench, and connect and fix the three loading actuators to the tested front suspension cylinder and front wheel assembly respectively;

[0044] Step 2: Control the loading actuator 1 to apply a first loading load to the tested front suspension cylinder and the front wheel assembly at the top end of the tested front suspension cylinder barrel, drive the suspension cylinder barrel to rotate relative to the suspension cylinder piston rod, and simulate the rotation load on the suspension cylinder barrel under the steering condition;

[0045] Step 3: Control the loading actuator 3 to apply a vertical load to the horizontal platform frame through the seesaw device. The horizontal platform frame loads the tested front suspension cylinder and the front wheel assembly in the vertical direction, drives the suspension cylinder piston rod to move up and down relative to the suspension cylinder barrel, and simulates the extension and retraction of the piston rod of the front suspension cylinder under the ground load impact condition;

[0046] Step 4: Control the loading actuator 2 to apply a horizontal load, push and pull the horizontal platform frame on the seesaw device to move horizontally, and transfer the horizontal load to the horizontal platform frame; the horizontal platform frame realizes horizontal loading of the front suspension cylinder and the front wheel assembly to simulate the horizontal load on the tested front suspension cylinder and the front wheel assembly;

[0047] Step 5: Control multiple loading actuators to apply loads in the horizontal, vertical and rotational directions at the same time, simulate the multiple load conditions of the suspension cylinder under different working conditions, and conduct performance tests;

[0048] Step 6: Adjust the loading load and frequency of the three loading actuators through the control system to realize the dynamic loading simulation test of the tested front suspension cylinder and front wheel assembly under the measured load spectrum to test the test front suspension assembly's sound, rebound, anti-eccentric load, weld strength, sealing, and service life performance;

[0049] Step 7: Change the temperature, humidity, and dust environment around the front suspension device to simulate the suspension cylinder in an extremely harsh environment and test the seal service life performance.

[0050] In some embodiments, each of the three loading actuators has a control console and can operate independently or synchronously to adjust the loading load. The three loading actuators are controlled by a computer.

[0051] Beneficial effects of the present invention:

[0052] The present invention provides a comprehensive test bench for the front suspension device of a mining dump truck. The front suspension cylinder and the front wheel assembly to be tested are fixed by a support bench and connected to loading actuators fixed on three groups of different structural frames. The three loading actuator hydraulic cylinders are used to simulate the front suspension cylinder being subjected to triple loads in the vertical direction, horizontal direction and turning (steering), so that efficient laboratory research, parameter measurement and quality assurance testing of the newly developed and designed front suspension cylinder can be carried out in a short period of time.

[0053] The present invention provides a comprehensive test bench for the front suspension device of a mining dump truck, which can adjust the parameters of the loading actuator, so as to perform various tests for newly developed front suspension devices of different specifications, and obtain reliable data in a short time, thereby shortening the development time of a series of new dump trucks. Through the accurate control of the loading actuator console, the experimental measurement is repeatable, and the test process results are not like the actual vehicle test in the traditional test field, which is overly dependent on the ability of the operator. The test data can be obtained conveniently and safely. Since various working conditions can be run in the laboratory all day, durability tests can greatly shorten the test cycle. Bench tests can create environmental conditions such as temperature and dust. The installation and fixation of the front suspension device is simpler than installing it on the actual vehicle, and it is easy to install, replace and test various working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] 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.

[0055] In the attached picture:

[0056] Figure 1 The present invention is a schematic diagram of the overall structure of a comprehensive test bench for a front suspension device of a mining dump truck.

[0057] Figure 2 The present invention is a schematic structural diagram of a support frame of a comprehensive test bench for a front suspension device of a mining dump truck.

[0058] Figure 3 The present invention is a schematic structural diagram of a comprehensive test bench structure frame 1 and a loading actuator 1 for a front suspension device of a mining dump truck.

[0059] Figure 4 for Figure 3 The enlarged schematic diagram at point A is specifically a detailed structural schematic diagram of the structural frame 1 and the loading actuator 1.

[0060] Figure 5 The present invention is a schematic structural diagram of a loading actuator 1 of a comprehensive test bench for a front suspension device of a mining dump truck.

[0061] Figure 6 The present invention is a schematic diagram of the structure of the second structural frame and the second loading actuator of the comprehensive test bench for the front suspension device of a mining dump truck.

[0062] Figure 7 The present invention is a schematic structural diagram of a loading actuator 2 of a comprehensive test bench for a front suspension device of a mining dump truck.

[0063] Figure 8 The present invention is a schematic diagram of the horizontal platform structure of a comprehensive test bench for the front suspension device of a mining dump truck.

[0064] Fig. 9 The present invention is a schematic diagram of a seesaw device structure of a comprehensive test bench for a front suspension device of a mining dump truck.

[0065] Fig.10 It is a structural schematic diagram of a support stand and a structural frame three of a comprehensive test stand for a front suspension device of a mining dump truck described in the present invention.

[0066] Fig.11 The present invention is a schematic structural diagram of a loading actuator three of a comprehensive test bench for a front suspension device of a mining dump truck.

[0067] Fig.12 The present invention is a schematic structural diagram of a tested front suspension cylinder and a front wheel assembly of a comprehensive test bench for a front suspension device of a mining dump truck.

[0068] Fig.13 The present invention is a schematic diagram of a control system of a comprehensive test bench for a front suspension device of a mining dump truck.

[0069] 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

[0070] 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.

[0071] In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0072] 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.

[0073] like Figure 1 As shown, a comprehensive test bench for the front suspension device of a mining dump truck comprises a support bench 1, a structural frame 2, a seesaw device 7, a horizontal platform frame 6, a structural frame 3 8 and a structural frame 2 4; the support bench 1 is used to install the tested front suspension cylinder and the front wheel assembly 10; the top of the structural frame 2 is fixed on the support bench 1, and a loading actuator 3 is installed at the top, the loading actuator 3 acts on the top part of the cylinder barrel of the tested front suspension cylinder, and transmits the rotation load of the loading actuator 3 to the suspension cylinder barrel 10-1, so as to realize the rotation of the suspension cylinder barrel 10-1 relative to the suspension cylinder piston rod 10-3; the seesaw device 7 is arranged on the front suspension cylinder to be tested. The horizontal platform frame 6 is installed on the seesaw device 7, which is used to install and fix the tested front suspension cylinder and front wheel assembly 10; the structural frame three 8 is provided with a loading actuator three 9 arranged in a vertical direction, and the loading actuator three 9 applies a vertical load to the seesaw device 7, and transfers the vertical load of the loading actuator three 9 to the horizontal platform frame 6; the structural frame two 4 is connected with a loading actuator two 5 arranged in a horizontal direction, and the loading actuator two 5 applies a horizontal load to the horizontal platform frame 6, and pushes and pulls the horizontal platform frame 6 to move horizontally on the seesaw device 7, and transfers the horizontal load of the loading actuator two 5 to the horizontal platform frame 6.

[0074] The present invention fixes the tested front suspension cylinder and front wheel assembly through a support frame, and connects them with loading actuators fixed on three groups of different structural frames. The loading actuators are used to simulate the front suspension cylinder being subjected to triple loads in vertical, horizontal and turning (steering), so as to achieve efficient laboratory research and parameter measurement and quality assurance testing of the newly developed and designed front suspension cylinder in a short period of time.

[0075] The above-mentioned support stand is further described below.

[0076] like Figure 2 As shown, the support frame 1 is composed of a short support column, a long support column and a crossbeam. The support frame 1 is arranged in a vertical direction, the long support column is fixed on the horizontal ground, and the short support column is used to install and fix the entire tested front suspension cylinder and front wheel assembly 10.

[0077] The above-mentioned structural frame 1 and loading actuator 1 are further explained below.

[0078] like Figure 3 , Figure 4 As shown, the structural frame 2 includes a support column 2-3, a bracket 2-1, a bracket 2-2, and a bracket 3 2-8. The support column 2-3 is fixed on the horizontal ground; the bracket 2-1 is fixed on the top surface of the support column 2-3, and the bracket 2-1 is provided with a hinge seat 2-4 for cooperating with the pin shaft 2-5 to assemble the loading actuator 3; the bracket 2-2 is fixed on the side elevation of the bracket 2-1, and is used to be fixed together with the support stand 1; the bracket 3 2-8 is fixed on the side elevation of the support column 2-3 located below the bracket 2-2, and the bracket 3 2-8 is provided with two groups of hinge holes 2-8-1 and 2-8-2, which are respectively used to hinge and fix the connecting rod 1 10-4 and the connecting rod 2 10-5 of the tested front suspension cylinder and front wheel assembly 10, so as to ensure the stability of the tested front suspension cylinder and front wheel assembly 10.

[0079] According to a further solution, after the outer end hinge holes on connecting rod 1 10-4 and connecting rod 2 10-5 are aligned with the corresponding hinge holes on bracket 3 2-8, the pins with ear plates fixed on both ends are respectively inserted into the corresponding aligned hinge holes, and then connecting rod 10-4 and connecting rod 2 10-5 are hinged together with bracket 3 2-8; a notch or a through hole is provided on the ear plate, and the ear plate is fixed to bracket 3 2-8 after the screw passes through the notch or the through hole, thereby limiting the axial position of the pin.

[0080] For further solutions, please refer to Figure 3 , Figure 4As shown, one end of the loading actuator 3 is hinged to the structural frame 2, and the other end is connected to the top part of the cylinder barrel 10-1 of the tested front suspension cylinder through a connecting rod assembly; the connecting rod assembly includes a fixed vertical plate 2-7 and a connecting rod 2-6 with threads at both ends; a row of spaced mounting holes are provided at the vertical edges on both sides of the fixed vertical plate 2-7, which are used to install and match the tested front suspension cylinders of different specifications through fasteners; the fixed vertical plate 2-7 is provided with two ear plates spaced apart up and down on the side surface facing away from the tested front suspension cylinder; the connecting rod 2-6 with threads at both ends is inserted into the through holes coaxially arranged in the upper and lower ear plates, and the connecting rod 2-6 is fixed to the two ear plates by fastening with two nuts arranged up and down, and the other end of the loading actuator 3 is hinged to the connecting rod 2-6.

[0081] The above-mentioned loading actuator 1 is further explained below.

[0082] like Figure 5 As shown, the loading actuator 3 is a hydraulic cylinder, which consists of a cylinder 3-2, a piston rod 3-3, an articulated connection end 3-1 and an articulated connection end 3-4. The articulated connection end 3-1 is articulated and fixed to an articulated seat 2-4, and the articulated connection end 3-4 is articulated and fixed to a connecting rod 2-6. Through the telescopic movement of the loading piston rod 3-3, a rotational load is applied and transmitted to the suspension cylinder barrel 10-1.

[0083] The above-mentioned structural frame 2 and loading actuator 2 are further explained below.

[0084] like Figure 6 As shown, the structural frame 24 includes an I-shaped support frame 4-1 and an articulated seat 1 4-2; the I-shaped support frame 4-1 is fixed on the horizontal ground; the articulated seat 1 4-2 is fixed on the top surface of the I-shaped support frame 4-1, one end of the loading actuator 25 is hinged to the articulated seat 1 4-2, and the other end is hinged to the horizontal platform frame 6 through a connecting rod assembly, so as to transfer the horizontal load of the loading actuator 25 to the horizontal platform frame 6.

[0085] For further solutions, please refer to Figure 6 As shown, the connecting rod assembly includes an articulated seat 2 4-3, a connecting vertical plate 4-4 with three hinges and a connecting rod 4-5; the articulated seat 2 4-3 is fixed on the horizontal ground between the structural frame 2 4 and the horizontal platform frame 6; the bottom hinge point of the connecting vertical plate 4-4 with three hinges is hinged to the articulated seat 2 4-3 through a pin, and the middle hinge point is hinged to the loading actuator 2 5 through a pin; one end of the connecting rod 4-5 is hinged to the top hinge point of the connecting vertical plate 4-4 through a pin, and the other end is hinged to the horizontal platform frame 6.

[0086] The above-mentioned loading actuator 2 is further explained below.

[0087] like Figure 7 As shown, the loading actuator 5 is a hydraulic cylinder, which consists of a cylinder 5-2, a piston rod 5-3, an articulated connection end 5-1 and an articulated connection end 5-4. The articulated connection end 5-1 is hingedly fixed to an articulated seat 4-2, and the articulated connection end 5-4 is hingedly fixed to a connecting vertical plate 4-4. Through the telescopic movement of the loading piston rod 5-3, a horizontal load is applied to the horizontal platform frame 6, thereby realizing horizontal loading of the tested front suspension cylinder and front wheel assembly 10.

[0088] The above-mentioned horizontal platform frame is further described below.

[0089] like Figure 8 As shown, the horizontal platform frame 6 includes an I-shaped support frame 6-3, a mounting platform 6-1 and a pull plate 6-2; a plurality of roller seats are provided on the bottom surface of the I-shaped support frame 6-3, and a roller 6-4 is installed on each roller seat through a pin shaft 6-5. When the horizontal platform frame 6 applies a horizontal load to the loading actuator 25, the roller 6-4 can move horizontally on the grooved track 7-1-1 on the seesaw device 7; the mounting platform 6-1 is composed of a bottom plate and an annular side plate surrounding the periphery of the bottom plate and extending vertically upward therefrom, the bottom plate is fixed on the top surface of the I-shaped support frame 6-3, and the mounting platform 6-1 is used to install and fix the tested front suspension cylinder and front wheel assembly 10; the pull plate 6-2 is fixed on the side surface of the I-shaped support frame 6-3, and is used to be hinged with the connecting rod 4-5.

[0090] The seesaw device described above is further described below.

[0091] like Fig. 9 As shown, the seesaw device 7 includes a U-shaped support frame 7-2 with a pair of coaxial reamed holes and a seesaw beam 7-1; the U-shaped support frame 7-2 is fixed on the horizontal ground; the seesaw beam 7-1 is arranged in the U-shaped support frame 7-2, and is hinged to the U-shaped support frame 7-2 through pins on both sides, one end face of the seesaw beam 7-1 is hinged to the loading actuator three 9, and the other end face of the seesaw beam 7-1 is installed with a horizontal platform frame 6 that can move horizontally thereon.

[0092] For further solutions, please refer to Fig. 9 As shown, the seesaw beam 7-1 is provided with an earring 7-1-2 at one end face along its length direction, which is hinged to the loading actuator 3 9 through a pin shaft; the seesaw beam 7-1 is provided with a U-shaped groove with an upward opening and running through the entire width at the other end face along its length direction, and a groove-shaped track 7-1-1 extending along the width direction is provided on the bottom surface of the U-shaped groove, which is used to guide and limit the horizontal movement of the horizontal platform frame 6.

[0093] The above structural framework three is further explained below.

[0094] like Fig.10 As shown, the structural frame three 8 includes an n-type support frame 8-1 and a frame-type mounting frame 8-2 fixed on the crossbeam of the n-type support frame; the n-type support frame 8-1 is fixed on the horizontal ground, and the frame-type mounting frame 8-2 is provided with a mounting hole 8-2-1 for installing a fixed loading actuator three 9, and the bottom of the loading actuator three 9 is hinged on the seesaw device 7 to provide the seesaw device 7 with a vertical downward pressing force or a vertical upward lifting force.

[0095] The above-mentioned loading actuator three is further explained below.

[0096] like Fig.11 As shown, the loading actuator 3 9 is a hydraulic cylinder, which is composed of a cylinder 9-1, a piston rod 9-2, a hinge and an articulated connection end 9-1. The articulated connection end 9-1 is hinged and fixed to the seesaw beam 7-1. Through the telescopic movement of the loading piston rod 9-2, a vertical load is applied to the horizontal platform frame 6, thereby realizing vertical loading of the tested front suspension cylinder and front wheel assembly 10.

[0097] The following is a further description of the tested front suspension cylinder and front wheel assembly described above.

[0098] like Fig.12 As shown, the tested front suspension cylinder and front wheel assembly 10 includes a front suspension cylinder barrel 10-1, a front suspension cylinder piston rod 10-3, a front wheel assembly 10-2, a connecting rod 10-4 and a connecting rod 2 10-5; the front suspension cylinder barrel 10-1 is assembled and connected with the front suspension cylinder piston rod 10-3, and the two can be relatively telescopic and rotatable, the front suspension cylinder piston rod 10-3 is installed and fixed on the front wheel assembly 10-2, and the connecting rod 10-4 and the connecting rod 2 10-5 are respectively hinged on the front wheel assembly 10-2.

[0099] like Fig.13 As shown, each of the three loading actuators has a control console, which can be operated independently or synchronously to adjust the loading items; the three loading actuators are controlled by a computer.

[0100] The present invention also provides a test method based on the above-mentioned comprehensive test bench for the front suspension device of a mining dump truck, and the test method comprises the following steps:

[0101] Step 1: Place the front suspension device of the dump truck on the comprehensive test bench, and connect and fix the three loading actuators to the tested front suspension cylinder and front wheel assembly respectively;

[0102] Step 2: Control the loading actuator 1 to apply a first loading load to the tested front suspension cylinder and the front wheel assembly at the top end of the tested front suspension cylinder barrel, drive the suspension cylinder barrel to rotate relative to the suspension cylinder piston rod, and simulate the rotation load on the suspension cylinder barrel under the steering condition;

[0103] Step 3: Control the loading actuator 3 to apply a vertical load to the horizontal platform frame through the seesaw device. The horizontal platform frame loads the tested front suspension cylinder and the front wheel assembly in the vertical direction, drives the suspension cylinder piston rod to move up and down relative to the suspension cylinder barrel, and simulates the extension and retraction of the piston rod of the front suspension cylinder under the ground load impact condition;

[0104] Step 4: Control the loading actuator 2 to apply a horizontal load, push and pull the horizontal platform frame on the seesaw device to move horizontally, and transfer the horizontal load to the horizontal platform frame; the horizontal platform frame realizes horizontal loading of the front suspension cylinder and the front wheel assembly to simulate the horizontal load on the tested front suspension cylinder and the front wheel assembly;

[0105] Step 5: Control multiple loading actuators to apply loads in the horizontal, vertical and rotational directions at the same time, simulate the multiple load conditions of the suspension cylinder under different working conditions, and conduct performance tests;

[0106] Step 6: Adjust the loading load and frequency of the three loading actuators through the control system to realize the dynamic loading simulation test of the tested front suspension cylinder and front wheel assembly under the measured load spectrum to test the test front suspension assembly's sound, rebound, anti-eccentric load, weld strength, sealing, and service life performance;

[0107] Step 7: Change the temperature, humidity, and dust environment around the front suspension device to simulate the suspension cylinder in an extremely harsh environment and test the seal service life performance.

[0108] In summary, the present invention provides a comprehensive test bench for the front suspension device of a mining dump truck. The tested front suspension cylinder and front wheel assembly are fixed by a support bench, and are connected to loading actuators fixed on three groups of different structural frames. The three loading actuator hydraulic cylinders are used to simulate the front suspension cylinder being subjected to triple loads in the vertical direction, horizontal direction and turning (steering), so as to realize efficient laboratory research and parameter measurement and quality assurance testing of the newly developed and designed front suspension cylinder in a short period of time.

[0109] The present invention provides a comprehensive test bench for the front suspension device of a mining dump truck, which can adjust the parameters of the loading actuator, so as to perform various tests for newly developed front suspension devices of different specifications, and obtain reliable data in a short time, thereby shortening the development time of a series of new dump trucks. Through the accurate control of the loading actuator console, the experimental measurement is repeatable, and the test process results are not like the actual vehicle test in the traditional test field, which is overly dependent on the ability of the operator. The test data can be obtained conveniently and safely. Since various working conditions can be run in the laboratory all day, durability tests can greatly shorten the test cycle. Bench tests can create environmental conditions such as temperature and dust. The installation and fixation of the front suspension device is simpler than installing it on the actual vehicle, and it is easy to install, replace and test various working conditions.

[0110] 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.

[0111] 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.

[0112] 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 comprehensive test bench for the front suspension device of a mining dump truck, characterized in that: include: Supporting stand, used to install the tested front suspension cylinder and front wheel assembly; A structural frame 1, the top of which is fixed on the support frame, and a loading actuator 1 is installed at the top, the loading actuator 1 acts on the top of the cylinder barrel of the suspension cylinder under test, and transmits the rotation load of the loading actuator 1 to the cylinder barrel of the suspension cylinder; A seesaw device is arranged below the tested front suspension cylinder and front wheel assembly; A horizontal platform frame, installed on the seesaw device, used to install and fix the tested front suspension cylinder and front wheel assembly; A structural frame 3, on which a loading actuator 3 arranged in a vertical direction is provided, wherein the loading actuator 3 applies a vertical load to the seesaw device, and transmits the vertical load of the loading actuator 3 to the horizontal platform frame; The second structural frame is connected to a second loading actuator arranged in a horizontal direction. The second loading actuator acts on the horizontal platform frame, pushes and pulls the horizontal platform frame to move horizontally on the seesaw device, and transmits the horizontal load of the second loading actuator to the horizontal platform frame.

2. The comprehensive test bench for the front suspension device of a mining dump truck according to claim 1 is characterized in that: The structural framework 1 comprises: Support columns, fixed on the horizontal ground; A bracket 1 is fixed on the top surface of the support column, and a hinge seat for assembling a loading actuator 1 is installed on the bracket 1; Bracket 2 is fixed on the side elevation of bracket 1 and is used to be fixed together with the support frame; Bracket three is fixed on the side elevation of the support column located below bracket two. Bracket three is provided with two sets of hinge holes, which are respectively used to hinge and fix connecting rod one and connecting rod two of the tested front suspension cylinder and front wheel assembly.

3. The comprehensive test bench for the front suspension device of a mining dump truck according to claim 1 is characterized in that: After the outer end hinge holes on the connecting rod 1 and the connecting rod 2 are aligned with the corresponding hinge holes on the bracket 3, the pins with ear plates fixed at both ends are respectively inserted into the corresponding aligned hinge holes, and the connecting rod 1 and the connecting rod 2 are hinged together with the bracket 3; The ear plate is provided with a notch or a through hole, and the screw passes through the notch or the through hole to fix the ear plate on the bracket three, thereby axially limiting the pin shaft.

4. The comprehensive test bench for the front suspension device of a mining dump truck according to claim 1 is characterized in that: One end of the loading actuator is hinged to the structural frame, and the other end is connected to the top end of the tested front suspension cylinder barrel through a connecting rod assembly; the connecting rod assembly includes: The fixed vertical plate is provided with a row of spaced mounting holes at the vertical edges on both sides thereof, and is used to mount the tested front suspension oil cylinders of different specifications through fasteners; the fixed vertical plate is provided with two spaced ear plates on the side surface facing away from the tested front suspension oil cylinder; A connecting rod with threads at both ends is inserted into through holes coaxially arranged in the upper and lower ear plates, and the connecting rod is fixed to the two ear plates by fastening with two nuts arranged up and down. The other end of the loading actuator is hinged on the connecting rod.

5. The comprehensive test bench for the front suspension device of a mining dump truck according to claim 1 is characterized in that: The structural frame three includes an N-type support frame and a frame-type mounting frame fixed on the cross beam of the N-type support frame; the N-type support frame is fixed on the horizontal ground, the top of the loading actuator three is installed on the frame-type mounting frame, and the bottom of the loading actuator three is hinged on the seesaw device to provide a vertical downward pressing force or a vertical upward lifting force to the seesaw device.

6. A comprehensive test bench for front suspension of a mining dump truck according to claim 1, characterized in that: The seesaw device comprises: A U-shaped support frame with a pair of coaxial reamed holes, fixed on the horizontal ground; The seesaw beam is arranged in the U-shaped support frame and is hinged to the U-shaped support frame through pins on both sides. One end face of the seesaw beam is three-phase hinged to the loading actuator, and the other end face of the seesaw beam is installed with the horizontal platform frame capable of horizontal movement thereon.

7. A comprehensive test bench for the front suspension device of a mining dump truck according to claim 6, characterized in that: The seesaw beam is provided with an earring on one end surface along its length direction, and is hinged to the loading actuator through a pin in three phases; The seesaw beam is provided with a U-shaped groove opening upward and running through the entire width at the other end face along its length direction, and a groove-shaped track extending along the width direction is provided on the bottom face of the U-shaped groove for guiding and limiting the horizontal movement of the horizontal platform frame.

8. The comprehensive test bench for the front suspension device of a mining dump truck according to claim 1 is characterized in that: The horizontal platform frame comprises: An I-shaped support frame, the bottom surface of which is provided with a plurality of roller seats, each of which is provided with a roller via a pin shaft, and the roller can move horizontally on the grooved track on the seesaw device; The mounting platform is composed of a bottom plate and an annular side plate surrounding the periphery of the bottom plate and extending vertically upward therefrom, the bottom plate is fixed on the top surface of the I-shaped support frame, and the mounting platform is used to install and fix the tested front suspension cylinder and front wheel assembly; The pull plate is fixed on the side elevation of the I-shaped support frame and is used to be hinged together with the connecting rod assembly connected to the second loading actuator.

9. The comprehensive test bench for the front suspension device of a mining dump truck according to claim 1 is characterized in that: The second structural framework comprises: I-shaped support frame, fixed on the horizontal ground; The first articulated seat is fixed on the top surface of the I-shaped support frame. One end of the loading actuator 2 is articulated with the first articulated seat, and the other end is articulated with the horizontal platform frame through a connecting rod assembly.

10. A comprehensive test bench for the front suspension device of a mining dump truck according to claim 9, characterized in that: The connecting rod assembly comprises: A second hinged seat is fixed on the horizontal ground between the second structural frame and the horizontal platform frame; A connecting vertical plate with three hinge points, wherein the bottom hinge point is hinged to the hinge seat in two phases through a pin, and the middle hinge point is hinged to the loading actuator in two phases through a pin; A connecting rod, one end of which is hinged to the top hinge point of the connecting vertical plate through a pin shaft, and the other end of which is hinged to the horizontal platform frame.

11. The comprehensive test bench for the front suspension device of a mining dump truck according to claim 1, characterized in that: The loading actuator 1, loading actuator 2 and loading actuator 3 are all hydraulic cylinders composed of an oil cylinder, a piston rod and at least one hinged connection end.

12. The comprehensive test bench for the front suspension device of a mining dump truck according to claim 1, characterized in that: The tested front suspension cylinder and front wheel assembly include a front suspension cylinder barrel, a front suspension cylinder piston rod, a front wheel assembly, connecting rod one and connecting rod two; the front suspension cylinder barrel and the front suspension cylinder piston rod are assembled and connected, and the two can be relatively telescopic and rotatable, the front suspension cylinder piston rod is installed and fixed on the front wheel assembly, and connecting rod one and connecting rod two are respectively hinged on the front wheel assembly.

13. A test method based on the comprehensive test bench for the front suspension device of a mining dump truck according to any one of claims 1 to 12, characterized in that: The test method comprises the following steps: Step 1: Place the front suspension device of the dump truck on the comprehensive test bench, and connect and fix the three loading actuators to the tested front suspension cylinder and front wheel assembly respectively; Step 2: Control the loading actuator 1 to apply a first loading load to the tested front suspension cylinder and the front wheel assembly at the top end of the tested front suspension cylinder barrel, drive the suspension cylinder barrel to rotate relative to the suspension cylinder piston rod, and simulate the rotation load on the suspension cylinder barrel under the steering condition; Step 3: Control the loading actuator 3 to apply a vertical load to the horizontal platform frame through the seesaw device. The horizontal platform frame loads the tested front suspension cylinder and the front wheel assembly in the vertical direction, drives the suspension cylinder piston rod to move up and down relative to the suspension cylinder barrel, and simulates the extension and retraction of the piston rod of the front suspension cylinder under the ground load impact condition; Step 4: Control the loading actuator 2 to apply a horizontal load, push and pull the horizontal platform frame on the seesaw device to move horizontally, and transfer the horizontal load to the horizontal platform frame; the horizontal platform frame realizes horizontal loading of the front suspension cylinder and the front wheel assembly to simulate the horizontal load on the tested front suspension cylinder and the front wheel assembly; Step 5: Control multiple loading actuators to apply loads in the horizontal, vertical and rotational directions at the same time, simulate the multiple load conditions of the suspension cylinder under different working conditions, and conduct performance tests; Step 6: Adjust the loading load and frequency of the three loading actuators through the control system to realize the dynamic loading simulation test of the tested front suspension cylinder and front wheel assembly under the measured load spectrum to test the test front suspension assembly's sound, rebound, anti-eccentric load, weld strength, sealing, and service life performance; Step 7: Change the temperature, humidity, and dust environment around the front suspension device to simulate the suspension cylinder in an extremely harsh environment and test the seal service life performance.

14. A test method according to claim 13, characterized in that: The three loading actuators each have a control console and can operate independently or synchronously to adjust the loading load. The three loading actuators are controlled by a computer.

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