Road material anti-scouring performance testing device with crawler-type structure

Abstract

The utility model discloses a road material anti-scouring performance testing device with a crawler-type structure. The road material anti-scouring performance testing device comprises a fixing mechanism, a lifting mechanism, a crawler mechanism and a driving mechanism, a clamp for fixing a test piece is arranged in the fixing mechanism; the lifting mechanism is installed in the middle of the top plate of the fixing mechanism. The bottom of the lifting mechanism penetrates through the top plate of the fixing mechanism downwards and then is connected with the crawler mechanism. The driving mechanism is mounted at the top of the crawler mechanism; the crawler mechanism is arranged between the driving mechanism and the test piece. The track mechanism is driven by the lifting mechanism to move up and down, the distance between the track mechanism and a test piece is adjusted, the scouring acting force of the track mechanism on the test piece is effectively mastered, the driving mechanism is installed on the track mechanism, the brushes are evenly distributed on the track mechanism, and the brushes on the track mechanism are driven by the driving mechanism to rotate. The device effectively simulates the scouring process of the road material under the action of dynamic water pressure, and is simple to operate, low in equipment cost and suitable for popularization.

Description

Technical Field

[0001] The utility model relates to the technical field of road engineering materials, in particular to a road material anti-scour performance test device with a crawler structure. Background Art

[0002] During the actual use of roads, surface water will be pressed into the pavement structure along cracks or large gaps on the road surface under the action of vehicle loads, forming free water that can flow. Subsequently, the surface water and the free water inside the pavement structure will generate a large dynamic water pressure under the repeated action of vehicle loads, flow at high speed and produce a pumping effect, which will circulate the dynamic water scouring of the pavement structure, accelerate the fatigue and damage of the pavement material, reduce the strength and stability of the pavement structure, and shorten the service life of the pavement. In order to evaluate the anti-scouring performance of road materials, various test methods and test devices have been proposed at home and abroad. For example, the MTS equipment adopts a top-down loading method to simulate the effect of vehicle loads; first load the top surface of the specimen, and then The fine slurry is squeezed out, simulating the actual situation in which the fine slurry is squeezed out between the pavement surface and the base layer. When the MTS pressure head rises, negative pressure is generated between the pressure head and the top surface of the specimen, and free water is quickly sucked into the space between the bottom surface of the pressure head and the top surface of the specimen, simulating the actual situation in which the road surface rebounds after the wheels pass by and causes scouring. It can well simulate the scouring effect of actual road conditions, but the MTS testing machine is expensive and complicated to operate, making it difficult to promote its use in the laboratory. In addition, the methods commonly used to evaluate the anti-scouring performance of road materials include rotary scouring and vibration table methods. The rotary scouring method cannot effectively simulate the pumping effect of water under load; the vibration table method cannot effectively grasp the scouring force and scouring surface, and the accuracy of vibration loading is difficult to control. Utility Model Content

[0003] The purpose of the present utility model is to overcome the deficiencies in the above-mentioned prior art and to provide a test device for the scouring resistance of road materials with a crawler structure. The crawler mechanism is driven up and down by a lifting mechanism, the distance between the crawler mechanism and the test piece is adjusted, and the scouring force of the crawler mechanism on the test piece is effectively controlled. The driving mechanism is installed on the crawler mechanism, and brushes are evenly distributed on the crawler mechanism. The brushes on the crawler mechanism are driven to rotate by the driving mechanism, thereby effectively simulating the scouring process of road materials under the action of dynamic water pressure. The device is simple to operate, has low equipment cost, and is suitable for promotion.

[0004] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a crawler-type structure road material anti-scour performance test device, including a fixing mechanism, a lifting mechanism, a crawler mechanism and a driving mechanism;

[0005] The fixing mechanism is a square structure, and a clamp for fixing the test piece is provided inside the fixing mechanism;

[0006] The lifting mechanism is installed in the middle of the top plate of the fixing mechanism, and the bottom of the lifting mechanism passes downward through the top plate of the fixing mechanism and is connected to the crawler mechanism to facilitate the control of the crawler mechanism to move up and down in the vertical direction;

[0007] The driving mechanism is installed on the top of the crawler mechanism so that the driving mechanism can drive the crawler mechanism to rotate;

[0008] The crawler mechanism is arranged between the driving mechanism and the test piece so that the crawler mechanism can exert mechanical force on the test piece to simulate the scouring process of the road material by the dynamic water pressure inside the pavement structure under vehicle load.

[0009] Preferably, the fixing mechanism includes a shell, a base and a clamp, and the shell is a hollow structure;

[0010] The base is a U-shaped structure and is located in the hollow cavity of the shell. The bottom of the horizontal end of the base is fixedly connected to the bottom of the shell. The height of the vertical end of the base is less than the height of the shell. The test piece is placed in the base.

[0011] The clamp passes through the vertical end of the base and is pressed tightly against the side wall of the test piece.

[0012] Preferably, the lifting mechanism includes a lifting motor, a transmission rod and a telescopic screw, and the transmission rods are horizontally installed on both the left and right sides of the lifting motor;

[0013] The end of the transmission rod away from the lifting motor is rotatably connected to the telescopic screw to facilitate the vertical movement of the telescopic screw. The telescopic screw extends vertically downward from the end of the transmission rod away from the lifting motor, passes through the top plate of the fixing mechanism, and is connected to the crawler mechanism.

[0014] Preferably, the driving mechanism is a driving motor.

[0015] Preferably, the crawler mechanism includes a crawler frame, a transmission belt, a brush, a crawler, a driving wheel, a driven wheel, an auxiliary wheel and a bearing, and the top of the crawler frame is connected to the bottom of the lifting mechanism;

[0016] The transmission belt passes through the crawler bracket and connects the driving wheel and the driving mechanism;

[0017] There are multiple auxiliary wheels, and the multiple auxiliary wheels are arranged between the driving wheel and the driven wheel at intervals;

[0018] The driving wheel, the driven wheel and the auxiliary wheel are all engaged with the crawler track, and the driving wheel, the driven wheel and the auxiliary wheel are all rotatably connected to the crawler track support through bearings;

[0019] The brushes are evenly covered on the surface of the crawler.

[0020] Preferably, the fixing mechanism further comprises a drain port, a heating wire and a temperature sensor, and the drain port is provided on the side wall of the housing near the bottom;

[0021] The heating wire and the temperature sensor are both arranged in the shell, and there is a distance between the heating wire and the temperature sensor.

[0022] Preferably, the crawler bracket is an inverted U-shaped structure, the crawler is horizontally arranged between the two vertical ends of the crawler bracket, and the bottom of the vertical end of the crawler bracket is located above the bottom of the crawler.

[0023] Preferably, the test device further comprises a control mechanism, the control mechanism comprising a control panel, the control panel being provided with a power switch, a lifting motor switch, a lifting adjustment button, a drive motor switch, a speed adjustment button, a heating wire switch and a temperature adjustment button;

[0024] The lifting motor switch and lifting adjustment button are connected to the lifting mechanism to facilitate the control of the vertical displacement of the crawler mechanism;

[0025] The drive motor switch and the speed adjustment button are connected to the drive mechanism to facilitate adjustment of the speed of the drive mechanism;

[0026] The heating wire switch and the temperature adjustment button are connected to the fixing mechanism.

[0027] Preferably, the test piece has a length of 400 mm, a width of 100 mm, and a height of 100 mm.

[0028] Compared with the prior art, the present invention has the following advantages:

[0029] 1. The utility model drives the crawler mechanism up and down through the lifting mechanism, adjusts the distance between the crawler mechanism and the test piece, effectively controls the scouring force of the crawler mechanism on the test piece, and the driving mechanism is installed on the crawler mechanism. Brushes are evenly distributed on the crawler mechanism. The brushes on the crawler mechanism are driven to rotate by the driving mechanism, effectively simulating the scouring process of road materials under the action of dynamic water pressure. The device is simple to operate and has low equipment cost, and is suitable for promotion.

[0030] 2. The utility model drives the driving wheel in the crawler mechanism through the driving motor, and the driving wheel drives the driven wheel, crawler and auxiliary wheel to rotate synchronously, so that the brush on the surface of the crawler repeatedly flushes the test piece at a specific frequency. Under the control of the driving mechanism, the flushing frequency and flushing time of the equipment can be adjusted, which improves the comprehensiveness and reference value of data collection.

[0031] 3. The shell of the utility model is provided with an electric heating wire, which heats the water in the shell to provide a multi-temperature environment for the test piece, simulates the flushing conditions of the test piece under different temperature conditions, and improves the applicability of the equipment.

[0032] 4. The control panel of the utility model is provided with a lifting motor switch, a lifting adjustment button, a driving motor switch, a speed adjustment button, a heating wire switch and a temperature adjustment button. The lifting motor is controlled by the lifting motor switch and the lifting adjustment button, the driving motor is controlled by the driving motor switch and the speed adjustment button, and the heating wire is controlled by the heating wire switch and the temperature adjustment button, thereby improving the safety and operability of the device operation.

[0033] 5. In the present invention, multiple auxiliary wheels are arranged between the driving wheel and the driven wheel. The multiple auxiliary wheels are all engaged with the crawler belt, so that the brush on the crawler belt surface is in close contact with the test piece, solving the problem that the scouring surface of the test piece cannot be effectively controlled.

[0034] The present invention will be described in further detail below through the accompanying drawings and examples. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a structural diagram of the utility model;

[0036] Figure 2 for Figure 1 side view.

[0037] Description of the accompanying drawings:

[0038] 1—Lifting motor; 2—Transmission rod; 3—Telescopic screw;

[0039] 4—driving motor; 5—track support; 6—transmission belt;

[0040] 7—brush; 8—track; 9—driving wheel;

[0041] 10—driven wheel; 11—auxiliary wheel; 12—bearing;

[0042] 13—test piece; 14—fixture; 15—base;

[0043] 16—drain outlet; 17—heating wire; 18—temperature sensor;

[0044] 19—Control panel; 20—Power switch; 21—Lifting motor switch;

[0045] 22—Lift adjustment button; 23—Drive motor switch; 24—Speed ​​adjustment button;

[0046] 25—Heating wire switch; 26—Temperature adjustment button; 27—Casing. DETAILED DESCRIPTION

[0047] like Figure 1 、 Figure 2As shown, the utility model is a crawler-type structure road material anti-scour performance test device, including a fixing mechanism, a lifting mechanism, a crawler mechanism and a driving mechanism; the fixing mechanism is a square structure, and a clamp for fixing the test piece 13 is provided in the fixing mechanism; the lifting mechanism is installed in the middle of the top plate of the fixing mechanism, and the bottom of the lifting mechanism passes downward through the top plate of the fixing mechanism and is connected to the crawler mechanism to facilitate the control of the crawler mechanism to move up and down in the vertical direction; the driving mechanism is installed on the top of the crawler mechanism to facilitate the driving mechanism to drive the crawler mechanism to rotate; the crawler mechanism is arranged between the driving mechanism and the test piece 13 to facilitate the crawler mechanism to exert a mechanical force on the test piece 13 to simulate the scouring process of the road material by the dynamic water pressure inside the pavement structure under vehicle load.

[0048] In this embodiment, the test piece 13 is immersed in the fixing mechanism and the position of the test piece 13 is fixed. The lifting mechanism is started, and the lifting mechanism drives the crawler mechanism to move downward in the vertical direction so that the bottom of the crawler mechanism is in close contact with the surface of the test piece 13. The lifting mechanism stops working, and then the driving mechanism is started. The driving mechanism drives the crawler mechanism to rotate, and the crawler mechanism simulates the scouring effect of the tire on the surface of the test piece 13. After the crawler mechanism scours the test piece 13 for a preset time, the driving mechanism stops working, and the lifting mechanism is started again to raise the crawler mechanism to an appropriate height and then close the lifting mechanism. Finally, the water in the fixing mechanism is collected in a bucket. After the water in the bucket is processed, the scouring mass loss is calculated to evaluate the anti-scouring performance of the road material.

[0049] The fixing mechanism includes a shell 27, a base 15 and a clamp 14. The shell 27 is a hollow structure; the base 15 is a U-shaped structure and is located in the hollow cavity of the shell 27. The bottom of the horizontal end of the base 15 is fixedly connected to the bottom of the shell 27. The height of the vertical end of the base 15 is less than the height of the shell 27. The specimen 13 is placed in the base 15; the clamp 14 passes through the vertical end of the base 15 and is pressed tightly against the side wall of the specimen 13.

[0050] In this embodiment, the housing 27 is a square structure, the vertical end of the base 15 is provided with a threaded hole, the clamp 14 is a T-shaped screw, the vertical end of the clamp 14 passes through the threaded hole, and the horizontal ends of the clamp 14 are respectively located on both sides of the vertical end of the base 15. The test piece 13 is placed in the base 15, and the vertical end of the clamp 14 is screwed into the inside of the base 15. The vertical end of the clamp 14 continues to approach the test piece 13 until the vertical end of the clamp 14 is tightly pressed against the side wall of the test piece 13, or when the clamp 14 is pressed against the side wall of the test piece 13, the test piece 13 is placed in the base 15. A clamping gasket is provided between the vertical end of the clamp 14 and the specimen 13. The vertical end of the clamp 14 presses against the clamping gasket to achieve the effect of tightening the specimen 13. The clamps 14 at the two vertical ends of the base 15 are screwed into the same depth, so that the specimen 13 is located in the middle of the base 15. The clamps 14 on both sides of the specimen 13 continuously press against the specimen 13 to prevent the specimen 13 from sliding. Then water is poured into the shell 27. The water level in the shell 27 should exceed the surface of the specimen 13 so that the specimen 13 is immersed in water.

[0051] In another possible embodiment, the vertical end of the base 15 is provided with a first through hole, and the clamp 14 is a T-shaped structure. The diameter of the vertical end of the clamp 14 matches the aperture of the first through hole, so that the vertical end of the clamp 14 is convenient for inserting the first through hole. The vertical end of the clamp 14 is provided with a second through hole at intervals, and the T-shaped clamping piece is clamped in the second through hole. When in use, the horizontal end of the clamp 14 is located on the inner side of the vertical end of the base 15, and the vertical end of the clamp 14 is pushed outward along the first through hole to the outer side of the vertical end of the base 15. After the specimen 13 is placed, the horizontal end of the clamp 14 is pushed toward the specimen 13 through the vertical end of the clamp 14 until the horizontal end of the clamp 14 is tightly pressed against the specimen 13, and the T-shaped clamping piece is inserted into the second through hole located on the inner side wall of the vertical end of the base 15 to prevent the clamp 14 from moving away from the specimen 13, so that the horizontal end of the clamp 14 remains tightly pressed against the specimen 13.

[0052] Furthermore, a plurality of threaded holes or first through holes may be provided at the vertical end of the base 15 to improve the stability of the position of the test piece 13 .

[0053] The lifting mechanism includes a lifting motor 1, a transmission rod 2 and a telescopic screw 3. The transmission rods 2 are horizontally installed on the left and right sides of the lifting motor 1; the end of the transmission rod 2 away from the lifting motor 1 is rotatably connected to the telescopic screw 3 to facilitate driving the telescopic screw 3 to move vertically. The telescopic screw 3 extends vertically downward from the end of the transmission rod 2 along the length direction, passes through the top plate of the fixing mechanism, and is connected to the crawler mechanism.

[0054] In this embodiment, the lifting motor 1 is fixed to the top center of the housing 27. The top of the housing 27 is provided with a circular hole for the passage of the telescopic screw 3. The bottom of the telescopic screw 3 passes through the circular hole and is fixedly connected to the top of the crawler mechanism, facilitating the up and down movement of the crawler mechanism. The output shafts on the left and right sides of the lifting motor 1 are connected to the transmission rod 2 through a coupling. The telescopic screw 3 includes a housing, a worm gear, and a threaded rod. The worm gear is located within the housing. The transmission rod 2 passes through the housing and performs a worm-gear motion with the worm gear. The worm gear has an inner hole in the vertical direction, which is a threaded hole. The threaded rod passes through the inner hole of the worm gear and is threadedly connected to the worm gear. When the lifting motor 1 is started, the output shafts on the left and right sides of the lifting motor 1 rotate synchronously and respectively drive the transmission rods 2 connected to them to rotate synchronously. Each transmission rod 2 drives the worm gear connected to it to rotate. The rotation of the worm gear causes the threaded rod connected to the worm gear to perform vertical movement, which in turn drives the crawler mechanism fixed to it to move up and down. The lifting motor 1 adopts a lifting motor model YZ112M-6-1.5.

[0055] The driving mechanism is a driving motor 4 .

[0056] The drive motor 4 is a Y90 drive motor produced by Changzhou Lanzhong Electromechanical Technology Co., Ltd.

[0057] The crawler mechanism includes a crawler frame 5, a transmission belt 6, a brush 7, a crawler 8, a driving wheel 9, a driven wheel 10, an auxiliary wheel 11 and a bearing 12. The top of the crawler frame 5 is connected to the bottom of the lifting mechanism; the transmission belt 6 passes through the crawler frame 5 to connect the driving wheel 9 and the drive mechanism; there are multiple auxiliary wheels 11, and multiple auxiliary wheels 11 are arranged at intervals between the driving wheel 9 and the driven wheel 10; the driving wheel 9, the driven wheel 10 and the auxiliary wheel 11 are all engaged with the crawler 8, and the driving wheel 9, the driven wheel 10 and the auxiliary wheel 11 are all rotatably connected to the crawler frame 5 through the bearing 12; the brush 7 evenly covers the surface of the crawler 8.

[0058] In this embodiment, the driving motor 4 is installed on the top of the track bracket 5. The top plate of the track bracket 5 is provided with an opening for the transmission belt 6 to pass through. The transmission belt 6 passes through the track bracket 5 to connect the driving wheel 9 and the output shaft of the driving motor 4. The output shaft of the driving motor 4 drives the driving wheel 9 to rotate. The driving wheel 9 is engaged with the crawler 8, and the driving wheel 9 synchronously drives the crawler 8 to rotate. The crawler 8 is engaged with the driven wheel 10 and the auxiliary wheel 11, and the driven wheel 10 and the auxiliary wheel 11 rotate synchronously. The crawler 8 drives the brush 7 on its surface to rotate, and the brush 7 cyclically flushes the test piece 13 immersed in water, thereby simulating the flushing effect of the tire on the road.

[0059] Multiple auxiliary wheels 11 are rotatably connected to the track bracket 5 through bearings 12 respectively. The multiple auxiliary wheels 11 are provided to facilitate uniform force on the track 8, so that the brush 7 on the surface of the track 8 has the same scouring intensity on the test piece 13, avoiding the scouring intensity of the brush 7 at the driving wheel 9 and the driven wheel 10 on the test piece 13 being inconsistent with the scouring intensity of the brush 7 between the driving wheel 9 and the driven wheel 10 on the test piece 13, resulting in insufficient scouring force and affecting the test results.

[0060] The fixing mechanism also includes a drain port 16 , a heating wire 17 and a temperature sensor 18 . The drain port 16 is located on the side wall of the shell 27 near the bottom. The heating wire 17 and the temperature sensor 18 are both located inside the shell 27 , and there is a distance between the heating wire 17 and the temperature sensor 18 .

[0061] In this embodiment, the drain outlet 16 is used to discharge the water in the shell 27, and the heating wire 17 can continuously heat the water in the shell 27, so that the specimen 13 can be immersed in water of different temperatures, thereby simulating the scouring conditions of the road structure under different temperature conditions; the temperature sensor 18 is used to monitor the temperature of the water.

[0062] The crawler support 5 is an inverted U-shaped structure. The crawler 8 is horizontally arranged between the two vertical ends of the crawler support 5. The bottom of the vertical end of the crawler support 5 is located above the bottom of the crawler 8.

[0063] In this embodiment, each vertical end of the track bracket 5 is provided with a plurality of third through holes, and the two groups of through holes at the opposite vertical ends of the track bracket 5 are arranged opposite to each other. There are multiple bearings 12, and the left and right ends of each bearing 12 are rotatably connected to the two opposite third through holes. The bearings 12 rotatably connected to the driving wheel 9 and the driven wheel 10 are located at a first height, and the bearings 12 rotatably connected to the multiple auxiliary wheels 11 are located at a second height. The first height is above the second height, which facilitates the engagement of the multiple auxiliary wheels 11 with the crawler 8. The driving wheel 9, the driven wheel 10 and the auxiliary wheel 11 jointly support the crawler 8, so that the crawler 8 is evenly stressed along the length direction.

[0064] The test device also includes a control mechanism, which includes a control panel 19. The control panel 19 is provided with a power switch 20, a lifting motor switch 21, a lifting adjustment button 22, a drive motor switch 23, a speed adjustment button 24, a heating wire switch 25 and a temperature adjustment button 26; the lifting motor switch 21 and the lifting adjustment button 22 are connected to the lifting mechanism to facilitate control of the vertical displacement of the crawler mechanism; the drive motor switch 23 and the speed adjustment button 24 are connected to the drive mechanism to facilitate adjustment of the speed of the drive mechanism; the heating wire switch 25 and the temperature adjustment button 26 are connected to the fixing mechanism.

[0065] In this embodiment, the control panel 19 is arranged on one side of the shell 27, the lifting motor switch 21 and the lifting adjustment button 22 are connected with the lifting motor 1, which is convenient to control the forward rotation or reverse rotation of the lifting motor 1, the lifting motor 1 drives the transmission rod 2 to rotate forward or reverse synchronously, the transmission rod 2 drives the telescopic screw rod 3 to move upward or downward, thereby driving the track mechanism to move upward or downward, the lifting adjustment button 22 controls the rotating speed of the lifting motor 1, that is, the speed of the telescopic screw rod 3 moving upward or downward; the driving motor switch 23 and the rotating speed adjustment button 24 are connected with the driving motor 4, which controls the driving motor 4 to start or stop, and the rotating speed adjustment button 24 can also adjust the rotating speed of the driving motor 4, which is convenient to control the rotating speed of the driving motor 4, thereby controlling the rotating speed of the track 8, so as to adjust the scouring efficiency of the brush 7 on the surface of the track 8 on the surface of the test piece 13; the electric heating wire switch 25 and the temperature adjustment button 26 are connected with the electric heating wire 17 to control the electric heating wire 17 to heat or stop heating.

[0066] The length of the test piece 13 is 400 mm, the width is 100 mm, and the height is 100 mm.

[0067] When in use, first cure the formed test piece 13 according to the experimental requirements. After reaching the curing age, immerse the test piece 13 in water for 24 hours, then take out the test piece 13, wipe it dry, weigh it and record the mass m0. Before the test, take out the test piece 13 from the water for appearance inspection to ensure that there is no obvious damage. When starting the test, press the power switch 20 on the control panel 19, then start the lifting motor switch 21, and then adjust the speed of the lifting motor 1 through the lifting adjustment button 22 according to the experimental requirements, so that the lifting motor 1 drives the transmission rod 2 to rotate synchronously, and the transmission rod 2 drives the telescopic screw 3 to move upward in the vertical direction, adjust the crawler structure to a suitable height, and then put the test piece 13 into the base 15, and limit the test piece 13 by the clamp 14. The displacement of the test piece 13 is fixed in the base 15, and then water is poured into the shell 27 until the water level covers the surface of the test piece 13; after the water filling is completed, the heating wire switch 25 is turned on, and the heating wire 17 is controlled by the temperature adjustment button 26 to adjust the water body to the target temperature; the lifting motor switch 21 is started again, so that the lifting motor 1 drives the transmission rod 2 to rotate, and the transmission rod 2 drives the telescopic screw 3 to move downward in the vertical direction until the brush 7 is in close contact with the surface of the test piece 13 and can load it, then the lifting motor switch 21 is turned off, the drive motor switch 23 is started, and the drive motor 4 is adjusted to the working state through the speed adjustment button 24. The working state is the working speed of the drive motor 4 set in advance, and the drive motor 4 is turned on. The driving belt 6 drives the driving wheel 9 to rotate, and the driving wheel 9 drives the crawler 8, the driven wheel 10 and the auxiliary wheel 11 to move through engagement, so that the brush 7 covering the surface of the crawler 8 realizes the flushing of the surface of the test piece 13; when the flushing of the surface of the test piece 13 by the brush 7 reaches the preset time, which is the optimal working time set in advance, the driving motor switch 23 and the heating wire switch 25 are turned off, and the lifting motor switch 21 is started. The lifting motor 1 drives the transmission rod 2 to rotate, and the transmission rod 2 drives the telescopic screw 3 to move upward in the vertical direction. After the telescopic screw 3 drives the crawler structure to rise to the target height, the lifting motor switch 21 is turned off, the drain port 16 is opened, and the water in the shell 27 is collected in the bucket, and the clamp 14 is adjusted. , so that the clamp 14 releases the clamping of the specimen 13, and the specimen 13 is taken out; the water in the bucket is left to stand for 12 hours to allow the scour material to settle, and after pouring out the upper layer of clear water, the remaining turbid liquid is placed in an oven for drying, and then weighed to obtain the mass m1 lost by the specimen 13 after scouring, and the mass loss of the specimen 13 is calculated as p=m1 / m0*100%. The above test is performed on multiple specimens 13, and multiple test data are recorded, and the average scouring mass loss is calculated to evaluate the anti-scouring performance of the road material. The greater the scouring mass loss, the worse the anti-scouring performance of the material. It can be seen that the equipment of the present invention is simple to operate, low in equipment cost, and can effectively simulate the scouring process of road materials under the action of dynamic water pressure, and is suitable for wide promotion.

[0068] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any way. Any simple modification, change and equivalent structural transformation made to the above embodiment based on the technical essence of the present invention shall still fall within the scope of protection of the technical solution of the present invention.

Claims

1. A crawler-type road material anti-scour performance test device, characterized by: It includes a fixing mechanism, a lifting mechanism, a crawler mechanism and a driving mechanism; The fixing mechanism is a square structure, and a clamp for fixing the test piece (13) is provided inside the fixing mechanism; The lifting mechanism is installed in the middle of the top plate of the fixing mechanism, and the bottom of the lifting mechanism passes downward through the top plate of the fixing mechanism and is connected to the crawler mechanism to facilitate the control of the crawler mechanism to move up and down in the vertical direction; The driving mechanism is installed on the top of the crawler mechanism so that the driving mechanism can drive the crawler mechanism to rotate; The crawler mechanism is arranged between the driving mechanism and the test piece (13) so that the crawler mechanism can exert a mechanical force on the test piece (13) to simulate the flushing process of the road material by the dynamic water pressure inside the pavement structure under vehicle load.

2. A crawler-type road material anti-scour performance testing device according to claim 1, characterized in that: The fixing mechanism comprises a housing (27), a base (15) and a clamp (14), wherein the housing (27) is a hollow structure; The base (15) is a U-shaped structure and is located in the hollow cavity of the shell (27). The bottom of the horizontal end of the base (15) is fixedly connected to the bottom of the shell (27). The height of the vertical end of the base (15) is less than the height of the shell (27). The test piece (13) is placed in the base (15); The clamp (14) passes through the vertical end of the base (15) and is pressed tightly against the side wall of the test piece (13).

3. A crawler-type structure road material anti-scour performance testing device according to claim 1, characterized in that: The lifting mechanism comprises a lifting motor (1), a transmission rod (2) and a telescopic screw (3), wherein the transmission rods (2) are horizontally mounted on both the left and right sides of the lifting motor (1); The end of the transmission rod (2) away from the lifting motor (1) is rotatably connected to the telescopic screw (3) to facilitate the vertical movement of the telescopic screw (3). The telescopic screw (3) passes vertically downward through the top plate of the fixing mechanism along the length direction away from the end of the transmission rod (2) and is connected to the crawler mechanism.

4. A crawler-type structure road material anti-scour performance testing device according to claim 1, characterized in that: The driving mechanism is a driving motor (4).

5. A crawler-type structure road material anti-scour performance testing device according to claim 1, characterized in that: The crawler mechanism comprises a crawler frame (5), a transmission belt (6), a brush (7), a crawler (8), a driving wheel (9), a driven wheel (10), an auxiliary wheel (11) and a bearing (12), wherein the top of the crawler frame (5) is connected to the bottom of the lifting mechanism; The transmission belt (6) passes through the crawler support (5) and is connected to the driving wheel (9) and the driving mechanism; There are multiple auxiliary wheels (11), and the multiple auxiliary wheels (11) are arranged at intervals between the driving wheel (9) and the driven wheel (10); The driving wheel (9), the driven wheel (10) and the auxiliary wheel (11) are all engaged with the crawler belt (8), and the driving wheel (9), the driven wheel (10) and the auxiliary wheel (11) are all rotatably connected to the crawler belt support (5) through bearings (12); The brush (7) is evenly covered on the surface of the crawler (8).

6. A crawler-type structure road material anti-scour performance testing device according to claim 2, characterized in that: The fixing mechanism further comprises a water outlet (16), a heating wire (17) and a temperature sensor (18), wherein the water outlet (16) is arranged on the side wall of the housing (27) near the bottom; The heating wire (17) and the temperature sensor (18) are both arranged in the housing (27), and there is a distance between the heating wire (17) and the temperature sensor (18).

7. A crawler-type structure road material anti-scour performance testing device according to claim 5, characterized in that: The crawler support (5) is an inverted U-shaped structure, the crawler (8) is horizontally arranged between the two vertical ends of the crawler support (5), and the bottom of the vertical end of the crawler support (5) is located above the bottom of the crawler (8).

8. The crawler-type structure road material anti-scour performance testing device according to claim 1, characterized in that: The test device further comprises a control mechanism, the control mechanism comprising a control panel (19), the control panel (19) being provided with a power switch (20), a lifting motor switch (21), a lifting adjustment button (22), a driving motor switch (23), a speed adjustment button (24), a heating wire switch (25) and a temperature adjustment button (26); The lifting motor switch (21) and the lifting adjustment button (22) are connected to the lifting mechanism to facilitate the control of the vertical displacement of the crawler mechanism; The driving motor switch (23) and the speed adjustment button (24) are connected to the driving mechanism to facilitate adjustment of the speed of the driving mechanism; The heating wire switch (25) and the temperature adjustment button (26) are connected to the fixing mechanism.

9. A crawler-type structure road material anti-scour performance testing device according to claim 1, characterized in that: The test piece (13) has a length of 400 mm, a width of 100 mm, and a height of 100 mm.

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