Road material load wear limit slip rate tester

Abstract

The present invention relates to a road material loading wear limiting slip rate tester, comprising a frame, a flat plate fixed on one side of the frame, a test piece, a rubber test wheel, a wheel frame assembly for driving the rubber test wheel to rotate, a loading device for driving the wheel frame assembly to lift and lower, two sets of guide assemblies fixed on the flat plate, a water tank fixed on the flat plate, a heating plate fixed in the water tank, the rubber test wheel is located above the test piece, and the test piece is placed on the heating plate; and also includes a transverse driving device fixed on the other side of the frame and used to drive the loading device to move horizontally back and forth along the guide assembly. The road material loading wear limiting slip rate tester provided by the present invention is suitable for indoor accelerated wear tests on various road material specimens, and mainly adopts the interaction between the rubber test wheel and the specimen, and realizes the actual wear process of the road surface under traffic and heavy-load traffic conditions by changing the load pressure.

Description

Technical Field

[0001] The invention relates to the technical field of experimental equipment, in particular to a road material loading wear limiting slip rate tester. Background Art

[0002] The wear properties of pavement materials directly affect the driving safety and comfort of vehicles. Therefore, it is necessary to simulate the wear resistance of pavement material specimens under vehicle loads to provide a strong experimental basis for pavement structure design and functional layer material composition. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a road material loading wear limiting slip rate tester, which can simulate the accelerated wear test of a road material specimen.

[0004] In order to solve the above technical problems, the present invention provides the following technical solutions: a road material loading wear limit slip rate tester, comprising a frame, a flat plate fixed on one side of the frame, a test piece, a rubber test wheel, a wheel frame assembly for driving the rubber test wheel to rotate, a loading device for driving the wheel frame assembly to move up and down, two sets of guide assemblies fixed on the flat plate, a water tank fixed on the flat plate, and a heating plate fixed in the water tank, the rubber test wheel is located above the test piece, and the test piece is placed on the heating plate; and also includes a transverse driving device fixed on the other side of the frame and used to drive the loading device to move horizontally back and forth linearly along the guide assembly.

[0005] On the basis of the above technical scheme, the wheel frame assembly includes a wheel frame plate, a first motor and a first reducer fixed on the upper surface of the wheel frame plate, a driving wheel fixedly connected to the output shaft of the first reducer, and side plates fixed at both ends of the lower surface of the wheel frame plate. A rotatable shaft is fixed between the two side plates, and a driven wheel and a rubber test wheel are coaxially fixed on the shaft, and the driving wheel is chain-connected with the driven wheel; the first motor drives the driving wheel to rotate through the first reducer, and the driving wheel and the driven wheel chain drive thereby drive the rubber test wheel to rotate.

[0006] On the basis of the above technical scheme, the guide assembly includes a horizontally distributed sliding rod and a vertically distributed support column, and the two ends of the sliding rod are respectively fixed on the flat plate through the support columns; the loading device includes a fixed seat, a loading cylinder fixed on the upper surface of the fixed seat, a guide seat fixed on the lower surface of the fixed seat and corresponding to the sliding rod, and a loading rod whose top end is fixedly connected to the telescopic end of the loading cylinder and whose bottom end is fixedly connected to the wheel frame assembly; the guide seat can be horizontally reciprocatingly slidably sleeved on the sliding rod, and the loading cylinder drives the wheel frame assembly to move up and down through the loading rod.

[0007] Based on the above technical solution, a number of guide rods are vertically fixed on the wheel frame assembly, and a guide hole corresponding to each guide rod is opened on the fixed seat. A linear bearing is fixed in each guide hole, and the top end of each guide rod can be lifted and lowered and passes through the linear bearing to be located above the fixed seat.

[0008] Based on the above technical solution, the transverse driving device includes a crank transmission mechanism, which includes a swing arm and a connecting rod hinged to the swing arm, one end of the connecting rod is hinged to the loading device; the transverse driving device also includes a rotation driving device for driving the swing arm to rotate in the circumferential direction.

[0009] Based on the above technical solution, the rotation drive device includes a second motor and a second reducer fixed on the frame, a drive shaft fixedly connected to the output shaft of the second reducer, a transmission shaft coaxially distributed with the drive shaft, and a torque sensor fixed between the drive shaft and the transmission shaft. A rotating seat is fixed on the frame, the transmission shaft is rotatably fixed on the rotating seat and one end of the swing arm is fixed to the top of the transmission shaft; the second motor drives the drive shaft and the transmission shaft to rotate through the second reducer, and the transmission shaft then drives the swing arm to rotate.

[0010] Compared with the prior art, the present invention has the following beneficial effects: the road material loaded wear limiting slip rate tester provided by the present invention is suitable for indoor accelerated wear tests on various pavement material specimens, mainly using the interaction between the rubber test wheel and the specimen, and realizing the actual wear process of the pavement under traffic and heavy-load traffic conditions by changing the load pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the structure of the tester of the present invention when the water tank is not installed;

[0012] Figure 2 This is a schematic diagram of the main viewing angle of the tester of the present invention;

[0013] The numbers in the figure are: 1-frame, 2-plate, 3-test piece, 4-rubber test wheel, 5-water tank, 6-heating plate, 7-wheel frame plate, 8-first motor, 9-first reducer, 10-side plate, 11-driven wheel, 12-slide rod, 13-support column, 14-fixed seat, 15-loading cylinder, 16-guide seat, 17-loading rod, 18-guide rod, 19-swing arm, 20-connecting rod, 21-second motor, 22-second reducer, 23-drive shaft, 24-transmission shaft, 25-torque sensor, 26-rotating seat. DETAILED DESCRIPTION

[0014] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0015] Reference Figure 1 and Figure 2 It can be seen that the road material loaded wear limit slip rate tester includes a frame 1, a flat plate 2 fixed on one side of the frame 1, a test piece 3, a rubber test wheel 4, a wheel frame assembly for driving the rubber test wheel 4 to rotate, a loading device for driving the wheel frame assembly to lift and lower, two sets of guide assemblies fixed on the flat plate 2, a water tank 5 fixed on the flat plate 2, and a heating plate 6 fixed in the water tank 5. The rubber test wheel 4 is located above the test piece 3, and the test piece 3 is placed on the heating plate 6; the heating plate 6 is provided with an automatic heating element and a temperature sensor electrically connected to the controller respectively, so as to utilize the heating plate to provide different temperature environments, simulate different temperature seasons of road traffic, and place the test piece under different temperature environments for testing, wherein the controller, the automatic heating element and the temperature sensor are all commercially available products, belonging to the prior art, and will not be described in detail.

[0016] The wheel frame assembly includes a wheel frame plate 7, a first motor 8 and a first reducer 9 fixed on the upper surface of the wheel frame plate 7, a driving wheel fixedly connected to the output shaft of the first reducer 9, and side plates 10 fixed at both ends of the lower surface of the wheel frame plate 7. A rotatable shaft is fixed between the two side plates 10, and a driven wheel 11 and a rubber test wheel 4 are coaxially fixed on the shaft, and the driving wheel and the driven wheel 11 are chain-connected; the first motor 8 drives the driving wheel to rotate through the first reducer 9, and the driving wheel and the driven wheel 11 are chain-connected to drive the rubber test wheel 4 to rotate; the first motor 8 is electrically connected to the controller, and the rubber test wheel 4 can be tested at different wheel speeds by controlling the first motor 8.

[0017] The guide assembly includes a horizontally distributed slide bar 12 and a vertically distributed support column 13, and both ends of the slide bar 12 are fixed on the flat plate 2 through the support column 13 respectively; the loading device includes a fixed seat 14, a loading cylinder 15 fixed on the upper surface of the fixed seat 14, a guide seat 16 fixed on the lower surface of the fixed seat 14 and corresponding to the slide bar 12, and a loading rod 17 whose top end is fixedly connected to the telescopic end of the loading cylinder 15 and whose bottom end is fixedly connected to the wheel frame assembly, and the bottom end of the loading rod 17 is fixed on the wheel frame plate 7 of the wheel frame assembly, and the guide seat 16 can be horizontally reciprocatingly slidably sleeved on the slide bar 12, and then the loading device realizes horizontal reciprocating sliding along the guide assembly through the sliding cooperation between the guide seat 16 and the slide bar 12; the loading cylinder 15 drives the wheel frame assembly to move up and down through the loading rod 17, and the loading cylinder 15 can be used to apply different loads to the rubber test wheel 4 for test testing; the rubber test wheel 4 is lowered to contact and rub with the test piece 3 to simulate the driving and road friction test. Moreover, a plurality of guide rods 18 are vertically fixed on the wheel frame assembly, and a guide hole corresponding to each guide rod 18 is opened on the fixed seat 14, and a linear bearing is fixed in each guide hole. The top end of each guide rod 18 can be lifted and lowered through the linear bearing and is located above the fixed seat 14, so that the guide rods 18 are utilized to improve the guiding stability of the lifting and lowering movement of the wheel frame assembly.

[0018] At the same time, the tester also includes a transverse driving device fixed to the other side of the frame 1 and used to drive the loading device to move horizontally back and forth along the guide assembly; the transverse driving device includes a crank transmission mechanism, the crank transmission mechanism includes a swing arm 19, and a connecting rod 20 hinged to the swing arm 19, one end of the connecting rod 20 is hinged to the loading device, specifically, one end of the connecting rod 20 is hinged to the fixed seat 14 of the loading device. The transverse driving device also includes a rotation driving device for driving the swing arm 19 to rotate in the circumferential direction, the rotation driving device includes a second motor 21 and a second reducer 22 fixed on the frame 1, a driving shaft 23 fixedly connected to the output shaft of the second reducer 22, a transmission shaft 24 coaxially distributed with the driving shaft 23, and a torque sensor 25 fixed between the driving shaft 23 and the transmission shaft 24. A rotating seat 26 is fixed on the frame 1, the transmission shaft 24 is rotatably fixed on the rotating seat 26, and one end of the swing arm 19 is fixed to the top of the transmission shaft 24; the second motor 21 drives the driving shaft 23 and the transmission shaft 24 to rotate through the second reducer 22, and the transmission shaft 24 then drives the swing arm 19 to rotate. The second motor 21 is electrically connected to the controller, and the rotation speed of the swing arm 19 can be changed by controlling the second motor 21, and then the loading device is driven to move along the guide rod through the crank transmission mechanism, so as to simulate different driving speeds. At the same time, the torque sensor collects torque parameters for the controller, and is used in conjunction with multiple parameters such as vehicle speed, wheel speed, load, temperature, and number of tests to assist in comprehensive calculation and evaluation of the wear performance of the specimen.

Claims

1. Road material loading wear limit slip rate tester, characterized by: The invention comprises a frame (1), a flat plate (2) fixed to one side of the frame (1), a test piece (3), a rubber test wheel (4), a wheel frame assembly for driving the rubber test wheel (4) to rotate, a loading device for driving the wheel frame assembly to move up and down, two sets of guide assemblies fixed to the flat plate (2), a water tank (5) fixed to the flat plate (2), and a heating plate (6) fixed in the water tank (5), wherein the rubber test wheel (4) is located above the test piece (3), and the test piece (3) is placed on the heating plate (6); and further comprises a lateral movement driving device fixed to the other side of the frame (1) and used for driving the loading device to move horizontally back and forth linearly along the guide assembly; The wheel frame assembly comprises a wheel frame plate (7), a first motor (8) and a first reducer (9) fixed on the upper surface of the wheel frame plate (7), a driving wheel fixedly connected to the output shaft of the first reducer (9), and side plates (10) fixed at both ends of the lower surface of the wheel frame plate (7); a rotatable shaft is fixed between the two side plates (10); a driven wheel (11) and a rubber test wheel (4) are coaxially fixed on the shaft; the driving wheel and the driven wheel (11) are connected by chain transmission; the first motor (8) drives the driving wheel to rotate through the first reducer (9); the driving wheel and the driven wheel (11) are chain-driven to drive the rubber test wheel (4) to rotate; The guide assembly comprises a horizontally distributed slide bar (12) and a vertically distributed support column (13), and both ends of the slide bar (12) are fixed to the flat plate (2) via the support column (13); the loading device comprises a fixed seat (14), a loading cylinder (15) fixed on the upper surface of the fixed seat (14), a guide seat (16) fixed on the lower surface of the fixed seat (14) and corresponding to the slide bar (12), and a loading rod (17) whose top end is fixedly connected to the telescopic end of the loading cylinder (15) and whose bottom end is fixedly connected to the wheel frame assembly; the guide seat (16) can be sleeved on the slide bar (12) in a horizontally reciprocating sliding manner, and the loading cylinder (15) drives the wheel frame assembly to move up and down via the loading rod (17); The transverse driving device comprises a crank transmission mechanism, the crank transmission mechanism comprises a swing arm (19), and a connecting rod (20) hinged to the swing arm (19), one end of the connecting rod (20) being hinged to the loading device; the transverse driving device also comprises a rotation driving device for driving the swing arm (19) to rotate in a circumferential direction; The rotary drive device comprises a second motor (21) and a second reducer (22) fixed on a frame (1), a drive shaft (23) fixedly connected to an output shaft of the second reducer (22), a transmission shaft (24) coaxially distributed with the drive shaft (23), and a torque sensor (25) fixed between the drive shaft (23) and the transmission shaft (24); a rotating seat (26) is fixed on the frame (1), the transmission shaft (24) is rotatably fixed on the rotating seat (26), and one end of a swing arm (19) is fixed to the top of the transmission shaft (24); the second motor (21) drives the drive shaft (23) and the transmission shaft (24) to rotate through the second reducer (22), and the transmission shaft (24) further drives the swing arm (19) to rotate.

2. The road material loading wear limit slip rate tester according to claim 1, characterized in that: A plurality of guide rods (18) are vertically fixed on the wheel frame assembly, and a guide hole corresponding to each guide rod (18) is opened on the fixed seat (14), and a linear bearing is fixed in each guide hole, and the top end of each guide rod (18) can be lifted and lowered and passes through the linear bearing and is located above the fixed seat (14).

3. The road material loading wear limit slip rate tester according to claim 1, characterized in that: The transverse driving device comprises a crank transmission mechanism, the crank transmission mechanism comprises a swing arm (19), and a connecting rod (20) hinged to the swing arm (19), one end of the connecting rod (20) being hinged to the loading device; the transverse driving device also comprises a rotation driving device for driving the swing arm (19) to rotate in a circumferential direction.

4. The road material loading wear limit slip rate tester according to claim 1, characterized in that: The rotary drive device comprises a second motor (21) and a second reducer (22) fixed on a frame (1), a drive shaft (23) fixedly connected to an output shaft of the second reducer (22), a transmission shaft (24) coaxially distributed with the drive shaft (23), and a torque sensor (25) fixed between the drive shaft (23) and the transmission shaft (24); a rotating seat (26) is fixed on the frame (1), the transmission shaft (24) is rotatably fixed on the rotating seat (26), and one end of a swing arm (19) is fixed to the top of the transmission shaft (24); the second motor (21) drives the drive shaft (23) and the transmission shaft (24) to rotate through the second reducer (22), and the transmission shaft (24) further drives the swing arm (19) to rotate.

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