CN112051137B - Quick wearing and tearing test device in road surface - Google Patents
Quick wearing and tearing test device in road surface Download PDFInfo
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- CN112051137B CN112051137B CN202011079291.XA CN202011079291A CN112051137B CN 112051137 B CN112051137 B CN 112051137B CN 202011079291 A CN202011079291 A CN 202011079291A CN 112051137 B CN112051137 B CN 112051137B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/56—Investigating resistance to wear or abrasion
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Abstract
The invention discloses a pavement rapid abrasion test device, which comprises a base, an abrasion wheel bracket, a sample tray and a controller, wherein the abrasion wheel bracket is arranged on the base; the base is provided with a linear motion mechanism and a slide rail, the slide rail is provided with a slide block, the sample tray is simultaneously connected with the output part of the linear motion mechanism and is connected with the slide block, the abrasion wheel bracket is arranged above the base, one end of the base is provided with an upright post, the connecting end of the abrasion wheel bracket is hinged with the upright post, the abrasion wheel bracket is provided with an abrasion motor, and the free end of the abrasion wheel bracket is provided with an abrasion wheel; the device can be used for accurately and quickly simulating the abrasion process of various road surfaces such as asphalt road surfaces, cement road surfaces and the like indoors, evaluating the change of the surface structure of the road surfaces under the repeated action of the tires and the influence on the performances such as surface skid resistance and the like of the road surfaces, and providing a basis for designing the road surfaces based on the consideration of the surface structure and the surface skid resistance.
Description
Technical Field
The invention belongs to an indoor simulation test device for pavement surface abrasion and further functional attenuation, and particularly relates to a pavement rapid abrasion test device.
Background
The road surface obviously increases the proportion of traffic accidents due to insufficient anti-skid performance, and the insufficient anti-skid performance of the road surface is mainly due to the repeated action of vehicle load, so that the surface structure of the road surface is gradually reduced, and the surface anti-skid performance is gradually attenuated until the anti-skid requirement for ensuring the driving safety can not be met. Therefore, in the design stage, the pavement structure and the material which meet the anti-skid requirement in the service life are designed by starting from the pavement structure, the material, the process and the like. The realization of the goal is greatly benefited by the fact that whether the anti-skid service level of a specific pavement structure and material in the life cycle can be estimated in the design stage, so that the design is further modified. Accurate anti-skid performance simulation and prediction also provide theoretical support for determining pavement maintenance time when the surface function is attenuated to be lower than the service level.
At present, many scholars at home and abroad also develop some indoor pavement abrasion test devices. The earliest of these was the los angeles abrader, and the abrasion device used to evaluate aggregate polishing value (PSV), both to simulate and evaluate aggregate abrasion resistance, which is quite different from the decay in surface skid resistance of a pavement. After that, many researchers developed road surface abrasion test devices, and most of them simulated the road surface abrasion by using a tire to make a circular motion. Representative are the Wehner and Schulz (W/S) and Aachen Polishingmachine (APM) devices. The W/S simulates the abrasion action by utilizing three rubber cones rotating at high speed to act on the core sample test piece, and the abrasion for 360min generally can attenuate the skid resistance of the pavement to a lower stable level. The APM device is a full-scale tire indoor abrasion test device, and simulates abrasion action by combining circumferential rolling of a tire on the surface of a test piece and horizontal reciprocating translation of the test piece, and the abrasion is generally 300min, so that the anti-skid performance of a road surface can be attenuated to a lower stable level. Although these two devices can simulate some attenuation processes of the anti-skid performance of the road surface, the main problem is that the abrasion effect of the tires on the road surface cannot be completely and truly simulated, because the vehicle runs on the road surface and mainly comprises three running modes of braking, accelerating starting and uniform-speed advancing, and the three running modes reflect that the vehicle tires run on the road surface in a linear mode instead of a circular motion. The tires corresponding to these three driving modes have directional wear on the road surface, either in the forward direction or opposite to the forward direction. This is also not simulated by the two wear machines described above.
Of course, some researchers developed linear wear test devices, such as the indoor road surface wear test device developed by the hansen theme group of changan university, and simulated the wear effect on the road surface during the braking process of the vehicle by using tires with brake slip ratios. Although the abrasion effect of the tire on the road surface during braking is realized, the directional abrasion effect of the tire on the road surface during acceleration starting and uniform-speed advancing is not considered. In practice, one of these three driving modes, or any combination of two or three of them, may occur on the actual road surface, and these may be combined differently on different road sections. In view of the complex wear requirements, the existing devices are not satisfactory due to their simple function. In addition, the unidirectional linear abrasion device has low abrasion efficiency due to the stroke, which is also a great limitation.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides an indoor pavement rapid wear test device which can be used for accurately and rapidly simulating the surface wear process of asphalt pavements and cement pavements indoors and evaluating the change of the surface structure of the pavements under the repeated action of the directivity of tires and the influence on the performances of the surface skid resistance and the like of the pavements, thereby providing a basis for pavement design based on the consideration of the surface structure and the surface skid resistance of the pavements.
In order to achieve the purpose, the invention adopts the technical scheme that: a pavement rapid abrasion test device comprises a base, a sample rack, an abrasion wheel bracket, a sample tray and a controller; the base is provided with a linear motion mechanism and a slide rail, the slide rail is provided with a slide block, the sample tray is simultaneously connected with the output part of the linear motion mechanism and is connected with the slide block, the abrasion wheel bracket is arranged above the base, one end of the base is provided with an upright post, the connecting end of the abrasion wheel bracket is hinged with the upright post, the abrasion wheel bracket is provided with an abrasion motor, the free end of the abrasion wheel bracket is provided with an abrasion wheel, and the abrasion wheel is positioned above the moving path of the sample tray; the output part of the abrasion motor is connected with the rolling shaft of the abrasion wheel, and the control signal input ends of the abrasion motor and the linear motion mechanism driver are connected with the output end of the controller.
The linear motion mechanism comprises a lead screw, the lead screw is arranged in parallel with the sliding rail, the lead screw and the base are relatively fixedly arranged, the driving end of the lead screw is connected with a driving motor, and the control signal input end of the driving motor is connected with the output end of the controller.
The slide rail is a polish rod slide rail, a slide rail with a T-shaped section or a slide rail with a groove-shaped section.
And both ends of the moving stroke of the sample tray are provided with limit switches.
And the sample tray is provided with a pressure sensor, and the pressure sensor is connected with the input end of the controller.
The side of wearing and tearing wheel support is provided with the uninstallation mechanism, and the uninstallation structure adopts electric telescopic handle, and electric telescopic handle's one end and base are connected, and the other end and wearing and tearing wheel leg joint, electric telescopic handle's control signal input end connection controller's output.
The wearing wheel support sets up the weight box on the extension section towards the base outside, and the bottom half is supported with the telescopic link, the telescopic link adopts electric telescopic handle.
The hanging end of the abrasion wheel bracket is also provided with a handle, and the handle is provided with an extension rod.
The output part of the abrasion motor is connected with the rolling shaft of the abrasion wheel, one end of the rolling shaft of the abrasion wheel is provided with a belt wheel, and the abrasion motor drives the rolling shaft of the abrasion wheel through the transmission of the belt wheel.
A transparent cover is arranged above the base, an opening is formed in the transparent cover, and a wiring of the controller penetrates through the opening and is arranged outside the transparent cover.
Compared with the prior art, the invention has at least the following beneficial effects: the invention can solve the problem of dual movement difficulty of the abrasion wheel which needs to rotate and translate through a combined mode of the abrasion wheel and the test piece movement, and improves the stability and the easy operability of the equipment operation; the test piece is abraded in a high-speed rotating mode of the driving wheel, so that the sliding friction effect is achieved, the space is saved, the abrasion time is greatly saved, and the abrasion efficiency is improved; the mode of combining the forward and reverse rotation of the rotating wheel and the forward and reverse translation of the test piece can be realized, directional multi-mode abrasion of the road surface is simulated, and the abrasion of the actual road surface is simulated more accurately and truly; the method has the advantages that the method adjusts the speed of the rolling wheel and the attached load on the tire, is beneficial to researching the influence of factors such as speed load and the like on the abrasion effect, and provides conditions for multi-working-condition pavement abrasion simulation; the device can accurately and quickly simulate the abrasion attenuation process of the surfaces of various road surfaces such as asphalt road surfaces, cement road surfaces and the like indoors, and is used for evaluating the change of the surface structure of the road surfaces under the repeated action of the tires and the influence on the performances such as surface skid resistance and the like of the road surfaces, so that a basis is provided for the road surface design based on the consideration of the surface structure and the surface skid resistance of the road surfaces, a reference is provided for the long-term performance evaluation of the surfaces of the road surfaces, and the time of intervention measures such as maintenance and repair is determined.
Drawings
FIG. 1 is a schematic diagram of an embodiment of the present invention.
FIG. 2 is a side view of one embodiment of the present invention.
In the attached figure, 1-base, 2-sample tray, 3-abrasion wheel, 4-abrasion wheel bracket, 5-extension section, 6-upright post, 7-abrasion motor, 8-slide rail, 9-lead screw, 10-driving motor, 11-limit switch, 12-slide block, 13-weight box and 14-telescopic rod.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings.
Referring to fig. 1 and 2, a rapid road wear test device comprises a base 1, a sample rack 2, a wear wheel 3, a wear wheel bracket 4, a sample tray 5 and a controller; the base 1 is provided with a linear motion mechanism and a slide rail 8, the slide rail is provided with a slide block, the sample tray 5 is simultaneously connected with the output part of the linear motion mechanism and connected with the slide block, the abrasion wheel bracket 4 is arranged above the base 1, one end of the base 1 is provided with an upright post 6, the connecting end of the abrasion wheel bracket 4 is hinged with the upright post 6, the abrasion wheel bracket 4 is provided with an abrasion motor 7, the suspended end of the abrasion wheel bracket 4 is provided with an abrasion wheel 3, and the abrasion wheel 3 is positioned above the moving path of the sample tray 5; the output part of the abrasion motor 7 is connected with the rolling shaft of the abrasion wheel 3, and the control signal input ends of the abrasion motor 7 and the linear motion mechanism driver are connected with the output end of the controller. As an optional implementation mode, the rectangular groove steel is formed by enclosing and welding reversed rectangular groove steel in a rectangular mode, and two limit switches are arranged at two stroke ends of the rectangular square steel side surface abrasion machine respectively.
Be provided with two slide rails along rectangular base's long limit, two slide rails pass through the slide rail support and connect respectively on rectangular base's two long edges, the slide rail all adopts the cylindricality slide rail, and the suit slider on the slide rail, test piece tray pass through slider slidable ground sets up on the slide rail, and test piece tray 5 adopts the steel sheet to weld into a groove shape, is two facades of recess along the slide rail vertical direction, highly is 40mm, the recess is used for placing the sample.
As another optional implementation manner, the slide rail directly contacts with the upper surface of the base, so that the bearing capacity of the slide rail is greatly improved, the slide rail with a T-shaped cross section or a groove-shaped cross section is arranged on the base, the slide rail is arranged on the upper surface of the base, a groove-shaped slide block corresponding to the T-shape or a square-shaped slide block corresponding to the groove-shaped slide rail is arranged on the slide rail, and the slide block and the test piece tray are connected or welded by bolts.
For the linear motion mechanism, two sides of a rectangular base can be provided with driving mechanisms, and the middle part is provided with a slide rail; or a driving mechanism is arranged in the middle of the frame body, and sliding rails are arranged on two sides of the frame body.
The one end of rectangular base sets up the stand, the stand adopts the square steel, and the welding is upright at rectangular base upper surface to the square steel, and the middle part of base is on a parallel with the slide rail sets up the lead screw, the suit lead screw nut on the lead screw, lead screw nut and test piece tray adopt bolted connection, and the one end and the stand of lead screw are connected, and the other end passes through the shaft coupling and is connected with driving motor, and driving motor sets up on the base and is connected with the base.
The lead screw can also be arranged on the base through a bearing seat and a bearing.
The abrasion wheel support 4 is arranged above the base, one end of the abrasion wheel support 4 is hinged to the upper portion of the upright column, the other end of the abrasion wheel support 4 is provided with an abrasion wheel, a rolling shaft of the abrasion wheel is rotatably connected with the abrasion wheel support 4 through a bearing, an abrasion motor is arranged above the abrasion wheel support 4, an output end of the abrasion motor 7 is connected with the rolling shaft of the abrasion wheel 3, one end of the rolling shaft of the abrasion wheel is provided with a belt wheel, and the abrasion motor drives the rolling shaft of the abrasion wheel through belt wheel transmission.
Optionally, the wearing wheel bracket 4 includes two steel plates, the two steel plates are arranged in parallel, one end of each steel plate is hinged to the stand column 6, the other end of each steel plate is provided with a bearing seat, a rolling shaft of the wearing wheel is embedded into the bearing seat through a bearing and is two approximately trapezoidal steel plates, and one end of each steel plate is hinged to the upper portion of the stand column 6 through a hinge shaft or a bolt.
A steel plate is welded on the top of the wearing wheel bracket 4, the wearing motor is connected with the steel plate through a bolt, and the wearing motor is connected with a synchronous belt wheel extending outwards from the rear steel plate through a synchronous belt. The synchronous belt wheel is connected with the rolling shaft, two rectangular key grooves are formed in the rolling shaft, two stop keys are arranged in the key grooves, and the rolling shaft is sleeved into the synchronous belt wheel.
In order to easily and smoothly support or unload the abrasion wheel after the test is completed, the side surface of the abrasion wheel support 4 is provided with an unloading mechanism, the unloading mechanism adopts an electric telescopic rod, one end of the electric telescopic rod is connected with the base, the other end of the electric telescopic rod is connected with the abrasion wheel support 4, when the abrasion test is stopped, the electric telescopic rod drives the abrasion wheel support 4 to move upwards, the abrasion structure on the upper part of the test piece is lifted, and the position of the test piece is convenient to replace.
The electric telescopic rods can be arranged on one side, and in order to support the abrasion wheel bracket 4 more balance, the electric telescopic rods can also be arranged on two sides of the abrasion wheel bracket 4.
In order to further improve the convenience during unloading and reduce the unloading resistance, a weight box is arranged on the extension section of the abrasion wheel support 4 facing the outer side of the base, specifically, a box body is arranged above the extension section of the abrasion wheel support 4, and a weight block is placed in the box body and used for reducing the wheel load acting on the test piece; the bottom of the box body is supported by a telescopic rod, the telescopic rod adopts an electric telescopic rod, the box body is supported at a position higher than the extended section of the abrasion wheel support 4 by the telescopic rod when the abrasion wheel works, when the abrasion wheel needs to be unloaded, the box body is put down by the telescopic rod, and the weight of the box body is pressed on the extended section of the abrasion wheel support 4.
Of course, to avoid the weight box suddenly pressing down the wear wheel carrier 4, the weight box is placed close to the point where the wear wheel carrier 4 is hinged to the upright 6 and is set according to the torque generated by the wear motor, the wear wheel carrier 4, the wear wheel and the wear wheel roller.
Preferably, the abrasion motor is 1.5kw, a motor controller is arranged at the upper part of the abrasion motor, an external wire of the motor controller is connected with the controller, and the controller realizes control of the working condition of the abrasion motor.
And both ends of the test piece tray travel path are provided with limit switches, and the limit switches are connected with the input end of the controller.
The control signal input end of the driving motor is connected with the output end of the controller.
In order to reduce noise and prevent fragments in the abrasion process, a transparent cover is arranged above the base 1, the whole device can be accommodated under the transparent cover, an opening is formed in the transparent cover, and a wiring of the controller penetrates through the opening and is arranged outside the transparent cover.
The abrasion test using the device of the present invention was as follows:
the test piece tray is defined to be 0 bit when being positioned at the leftmost side of the track and to be 1 bit when being positioned at the rightmost side of the track.
The unloading motor is started to gradually lift the upper load structure and separate the upper load structure from the test piece, and the unloading motor is turned off after the abrasion wheel is lifted by about 20 cm. And if the test piece tray is not at the 0 position, starting the driving motor to place the test piece tray at the 0 position.
Uniformly spreading quantitative quartz sand on the surface of a test piece to be ground and spraying quantitative water. And then starting the unloading motor in a reverse direction, and turning off the unloading motor after the unloading motor continues to operate for 3 seconds after the upper load acts on the surface of the test piece. The preparation is ready. And adjusting a wear motor controller, selecting the rolling direction of the tire, setting the rolling speed, starting the wear motor, sequentially selecting the translation direction and the speed of the driving motor and starting the motor in the same way, and then starting the test piece to wear. The running state of the equipment is observed in the abrasion process, and the motor is suspended at any time under abnormal conditions. When the abrasion of the test piece along the stroke length is finished, the test piece tray triggers a limit switch, the driving motor is automatically powered off to stop running, and then the abrasion motor is turned off; this completes the wear in one determined direction.
Starting a motor of the electric telescopic rod at the unloading mechanism, wherein the motor can realize gradual lifting of an upper load structure and separation from a test piece after working; turning off the unloading motor after the abrasion wheel is lifted by about 20 cm; and then, performing performance test in a wear stage, measuring the surface structure by using a sand paving method and a laser texture instrument, and measuring the anti-sliding performance of the test piece by using a pendulum type friction instrument.
And if the abrasion in the same direction as the previous time is to be kept, starting the driving motor reversely until the test piece returns to the initial 0 position of the previous time, and repeating the abrasion process.
If the abrasion is to be performed in the opposite direction to the previous time, the abrasion process may be directly repeated.
The device has the characteristics of high efficiency, convenience and accuracy, solves the double movement difficulty of the abrasion wheel which needs to rotate and move by adopting a combined mode of wheel rotation and test piece movement, and improves the running stability and the operability of equipment. The abrasion wheel is adopted to abrade the test piece in a high-speed rotating mode, so that the sliding friction effect is achieved, the space is saved, the abrasion time is greatly saved, and the abrasion efficiency is improved. The mode of combining the forward and reverse rotation of the rotating wheel and the forward and reverse translation of the test piece is adopted, so that the linear multi-mode abrasion of the pavement with the directivity is realized, and the abrasion of the actual pavement is simulated more accurately and truly. By adjusting the speed of the rolling wheel and the load attached to the tire, the influence of factors such as speed load and the like on the abrasion effect can be researched, and conditions are provided for multi-working-condition pavement abrasion simulation.
The rapid indoor pavement abrasion test device developed by the invention has the characteristics of lightness, convenience, high efficiency and accuracy, provides possibility for efficient abrasion of indoor pavements, and provides support for more accurately researching surface function attenuation of pavement full life cycles under specific structures and materials. The theory and practice are significant, and the application prospect is wide.
Claims (7)
1. A rapid pavement abrasion test device is characterized by comprising a base (1), an abrasion wheel (3), an abrasion wheel bracket (4), a sample tray (2) and a controller; the test device comprises a base (1), a linear motion mechanism and a slide rail (8) are arranged on the base (1), a slide block is arranged on the slide rail, a sample tray (2) is simultaneously connected with an output part of the linear motion mechanism and the slide block (12), a wearing wheel bracket (4) is arranged above the base (1), an upright post (6) is arranged at one end of the base (1), a connecting end of the wearing wheel bracket (4) is hinged with the upright post (6), a wearing motor (7) is arranged on the wearing wheel bracket (4), a wearing wheel (3) is arranged at a suspended end of the wearing wheel bracket (4), and the wearing wheel (3) is positioned above a moving path of the sample tray (2); the output part of the abrasion motor (7) is connected with the rolling shaft of the abrasion wheel (3), and the control signal input ends of the abrasion motor (7) and the linear motion mechanism driver are connected with the output end of the controller; a pressure sensor is arranged on the sample tray (2) and is connected with the input end of the controller; an unloading mechanism is arranged on the side surface of the wearing wheel bracket (4), the unloading mechanism adopts an electric telescopic rod, one end of the electric telescopic rod is connected with the base, the other end of the electric telescopic rod is connected with the wearing wheel bracket (4), and the control signal input end of the electric telescopic rod is connected with the output end of the controller; wear wheel support (4) set up weight box (13) on extension section (5) towards the base outside, and weight box (13) or extension section (5) bottom sets up telescopic link (14) and supports, the telescopic link adopts electric telescopic handle.
2. The road surface rapid wear test device according to claim 1, characterized in that the linear motion mechanism comprises a lead screw (9), the lead screw (9) is arranged in parallel with the slide rail (8), the lead screw (9) and the base are relatively fixedly arranged, the active end of the lead screw (9) is connected with a driving motor (10), and the control signal input end of the driving motor (10) is connected with the output end of the controller.
3. The pavement rapid wear test device according to claim 1, wherein the slide rail (8) is a polish rod slide rail, a T-shaped cross section slide rail or a groove-shaped cross section slide rail.
4. The rapid road wear test device according to claim 1, wherein limit switches (11) are arranged at both ends of the moving stroke of the sample tray (2).
5. The rapid pavement abrasion test device according to claim 1, wherein a handle is further arranged at the suspended end of the abrasion wheel bracket (4), and an extension rod is arranged on the handle.
6. The road surface rapid wear test device according to claim 1, characterized in that the output part of the wear motor (7) is connected with the rolling shaft of the wear wheel (3), one end of the rolling shaft of the wear wheel is provided with a pulley, and the wear motor (7) drives the rolling shaft of the wear wheel through the transmission of the pulley.
7. The rapid pavement abrasion test device according to claim 1, wherein a transparent cover is arranged above the base (1), an opening is formed in the transparent cover, and a wiring of the controller is arranged outside the transparent cover through the opening.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011079291.XA CN112051137B (en) | 2020-10-10 | 2020-10-10 | Quick wearing and tearing test device in road surface |
| PCT/CN2021/098636 WO2022073355A1 (en) | 2020-10-10 | 2021-06-07 | Pavement rapid abrasion test device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011079291.XA CN112051137B (en) | 2020-10-10 | 2020-10-10 | Quick wearing and tearing test device in road surface |
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| CN112051137A CN112051137A (en) | 2020-12-08 |
| CN112051137B true CN112051137B (en) | 2022-04-29 |
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| WO (1) | WO2022073355A1 (en) |
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| CN112051137B (en) * | 2020-10-10 | 2022-04-29 | 长安大学 | Quick wearing and tearing test device in road surface |
| CN116296746B (en) * | 2023-03-13 | 2023-11-14 | 宁波市新铭建设工程测试有限公司 | High-durability pre-stress concrete performance rapid detection method |
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| WO2022073355A1 (en) | 2022-04-14 |
| CN112051137A (en) | 2020-12-08 |
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