Device and method for evaluating wear resistance and gloss of road surface material

Abstract

The application belongs to the technical field of pavement material performance evaluation, and relates to a kind of indoor evaluation device and evaluation method of pavement material wear-resistant light performance, including test box body and sequentially arranged from top to bottom in test box body steering control assembly, movement assembly, abrasion monitoring assembly and test platform;Steering control assembly includes limiting square frame and Luer triangle steering disc placed in limiting square frame, limiting square frame is square frame, the length of side of limiting square frame is equal to the width of Luer triangle steering disc;Limiting square frame is connected with test box body inner wall, Luer triangle steering disc rotates along limiting square frame, and drives movement assembly and abrasion monitoring assembly to rotate synchronously, abrasion monitoring assembly is in contact with test platform and does linear continuous loading movement on the surface of test platform with square track with circular arc transition angle.The application can realize continuous linear loading, can simulate working condition truly, and improve test result accuracy.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of pavement material performance evaluation, and relates to a kind of indoor evaluation device and evaluation method for the wear-resistant light performance of pavement material. BACKGROUND

[0002] Pavement skid resistance is one of the key factors affecting traffic safety, and the pavement skid resistance is closely related to the wear-resistant light performance of the aggregate and mixture type used in the surface layer. Under the action of long-time driving, the aggregate on the pavement surface gradually becomes smooth, and the pavement structure becomes more compact, eventually leading to the gradual reduction of pavement skid resistance. Defects in pavement skid resistance can cause vehicles to slip on the pavement or the emergency braking distance to be too long, causing traffic accidents. From the perspective of the whole life cycle, not only is it required that the pavement surface layer has good skid-resistant structure in the early stage of operation, but also is it required that the structure always meets the actual needs of vehicle skid resistance during the entire operation process. Therefore, good wear-resistant performance is an important prerequisite for long-term maintenance of pavement skid resistance. Since skid resistance is a long-term performance indicator, it is difficult to accurately predict the development of future skid resistance of the pavement in the short term. However, effective evaluation of the wear-resistant performance of pavement materials at the mixture design stage can provide important reference for the selection of pavement materials and the verification of gradation types, thereby avoiding after-repair due to improper design. How to effectively test and evaluate the wear-resistant performance of pavement materials is the key to studying the skid resistance decay law of pavement materials, which is of great significance to the improvement of pavement service quality.

[0003] Currently, the polishing value test is generally used to test and evaluate the wear resistance of coarse aggregate. This method uses an accelerated polishing machine to polish the surface of coarse aggregate, and after a certain number of polishing times, the pendulum value of the coarse aggregate test piece is measured by a pendulum friction tester to represent the wear resistance of the aggregate. The test object of this method is coarse aggregate with a particle size of 9.5mm to 13.2mm, while the effects of fine aggregate, binder and gradation type on the wear resistance of the formed pavement are ignored, so it cannot fully reflect the wear resistance of the pavement material surface. For the characterization of the comprehensive polishing performance of pavement mixture materials, the accelerated simulation test method is mainly used in the laboratory, which can accelerate the wear and tear of the pavement under the action of vehicle load, evaluate the wear resistance of the pavement material in a short time, and can well control various variables, which is conducive to comparative analysis of the influence of various conditions. Therefore, the development of indoor polishing test method has important application value for studying the long-term wear resistance of pavement. However, the existing indoor polishing test related devices have many shortcomings in simulating the rubbing load. The indoor simulation test generally uses test wheels to load the rutting plate test piece in a straight line reciprocating or small ring loading, but the straight line reciprocating loading method is quite different from the actual driving condition, because the driving direction of the vehicle is fixed and unidirectional, and the pavement skid resistance should have directionality. In addition, the straight line reciprocating loading method also cannot ensure the uniform speed of the test wheel, and there is a clear starting and braking stage at the starting and ending positions, which will cause the test piece to move, and cannot simulate the stable wheel load. Moreover, this frequent change of driving direction also cannot achieve high-speed loading, which reduces the wear efficiency of the mixture rutting test piece. The ring loading method can achieve rapid and continuous wear process, but the test wheel driving direction is changing all the time, and the test wheel wear effect on the test piece under the nonlinear loading path is quite different from the actual vehicle load on the pavement, which also cannot simulate the real polishing effect of the pavement wheel, resulting in low efficiency and low accuracy of the wear resistance test.

[0004] In summary, the existing indoor wear resistance test device cannot meet the technical needs of current pavement material performance evaluation, and a new type of indoor pavement wear resistance test device needs to be developed according to the actual needs, and a continuous and efficient accelerated polishing method needs to be researched to improve the scientificity and effectiveness of long-term wear resistance evaluation of pavement materials, and better serve the pavement material design and pavement performance evaluation work. SUMMARY

[0005] In view of the poor authenticity and low accuracy of the test results of the existing indoor polishing simulation test of pavement materials, the present application provides an indoor evaluation device and method for the wear resistance of pavement materials, which can realize continuous linear loading of the test sample under indoor conditions, conveniently and efficiently complete the accelerated wear of the pavement materials, truly simulate the load of the vehicle and the polishing effect of the wheel, and improve the accuracy of the test results; meanwhile, a quantitative evaluation index for the wear resistance is provided to guide the pavement material design and performance evaluation.

[0006] In order to achieve the above-mentioned purpose, the technical scheme adopted by the present application is:

[0007] An indoor evaluation device for the wear resistance of pavement materials, comprising a test box body and, arranged in the test box body from top to bottom, a steering control assembly, a motion assembly, a wear monitoring assembly and a test platform; the steering control assembly comprises a limiting square frame and a Luer triangle steering disc arranged in the limiting square frame, the limiting square frame is a square frame, and the side length of the limiting square frame is equal to the width of the Luer triangle steering disc; the limiting square frame is connected with the inner wall of the test box body, the Luer triangle steering disc rotates along the limiting square frame and drives the motion assembly and the wear monitoring assembly to rotate synchronously, and the wear monitoring assembly is in contact with the test platform and moves linearly and continuously on the surface of the test platform in a square track with a circular arc transition angle.

[0008] The steering control assembly further comprises a spline shaft above the Luer triangle steering disc; the bottom end of the spline shaft penetrates the Luer triangle steering disc downward and is connected with the motion assembly; the spline shaft drives the motion assembly to rotate and drives the wear monitoring assembly to rotate synchronously according to the motion track of the Luer triangle steering disc.

[0009] The motion assembly comprises, connected from top to bottom, a lower rotating part, a load weight, a bearing platform, a support expansion platform and an extension support; the lower rotating part is connected with the spline shaft above the lower rotating part; the extension support and the wear monitoring assembly are three, the top ends of the three extension supports are connected with the support expansion platform, one wear monitoring assembly is connected to the bottom end of each of the three extension supports, and the connecting lines between the three wear monitoring assemblies form an equilateral triangle.

[0010] The three wear monitoring assemblies are two wear wheels and one torque test wheel, and the connecting lines between the three wear monitoring assemblies form an equilateral triangle, the one torque test wheel and the two wear wheels are connected with the three extension supports one by one, and the torque test wheel is provided with a telemetry torque sensor; the wear wheels and the torque test wheel are above the test platform and in contact with the test platform.

[0011] The test platform comprises a metal base and a rubber pad layer placed on the upper surface of the metal base; the test piece is placed on the rubber pad layer, and the abrasion wheel and the torque test wheel are in contact with the test piece.

[0012] The test platform further comprises metal partition plates placed on the rubber pad layer and connected with the metal base, the metal partition plates are multiple, and the multiple metal partition plates divide the upper surface of the metal base into four equal areas, and the test piece is placed on the rubber pad layer in each of the four areas.

[0013] The indoor evaluation device for the wear and light resistance of pavement materials further comprises a rotating system and a power system connected with the rotating system; the power system comprises a frequency converter and a horizontal rotating shaft which are sequentially connected and located outside the test box; the rotating system comprises a vertical rotating shaft, a universal joint shaft and an upper rotating piece which are sequentially connected and located inside the test box; the vertical rotating shaft is further connected with the horizontal rotating shaft; and the upper rotating piece is connected with the top end of the spline shaft.

[0014] The indoor evaluation device for the wear and light resistance of pavement materials further comprises a spraying device and a liquid film thickness detection device which are placed in the test box; the spraying device is directed towards the upper surface of the test platform, and the liquid film thickness detection device is located above the test platform.

[0015] An indoor evaluation method for the wear and light resistance of pavement materials, comprising the following steps:

[0016] 1) Prepare rut plate samples according to the set size or cut the field pavement, and prepare four test pieces;

[0017] 2) Place the four test pieces of step 1) on the rubber pad layers in the four areas of the indoor evaluation device for the wear and light resistance of pavement materials, and the upper surfaces of the test pieces are flush with the top surfaces of the metal partition plates, and the abrasion wheel and the torque test wheel are in contact with the upper surfaces of the test pieces;

[0018] 3) Place the load weights according to the design requirements, keep the load weights stable, record the weights of the load weights, set the rotating speed of the rotating system according to the test running speed, and set the total number of abrasion n;

[0019] 4) Initially, place the torque test wheel on the metal partition plate, mark the initial position of the metal partition plate as the initial position, start the work, and collect the initial torque data of the torque test wheel through the remote torque sensor;

[0020] 5) the power system rotates according to the set test running speed, the power system drives the rotating system to rotate, and in turn, under the action of the spline rotating shaft and the motion assembly, the abrasion monitoring assembly is synchronously rotated according to the motion track of the Lelos triangular steering disc, the abrasion wheel and the torque test wheel simultaneously do linear continuous loading motion on the surface of the test piece in the square track with a circular arc transition angle, and the abrasion of the test piece is carried out, when the torque test wheel returns to the initial position for the first time, the first abrasion is completed, and the torque data of the torque test wheel completing the first abrasion is collected through the telemetry torque sensor;

[0021] 6) repeat step 5), until the torque test wheel returns to the initial position for the nth time to complete the nth abrasion, and the torque data of the torque test wheel completing the nth abrasion is collected through the telemetry torque sensor;

[0022] 7) the data collected through the above steps 3) to 6) is substituted into the formula to calculate the abrasion resistance and polishing performance index RD n :

[0023]

[0024] In the formula:

[0025] R1 is the roughness value of the road surface material measured at the initial abrasion, that is, the initial torque data;

[0026] R n is the roughness value of the road surface material measured at the nth abrasion, that is, the torque data of the nth abrasion;

[0027] F is the weight of the load weight;

[0028] n is the number of abrasions.

[0029] In the steps 4) and 5), when the test piece is abraded, the spraying device is opened or closed according to the use environment of the test piece.

[0030] The beneficial effects of the present application are:

[0031] 1) The indoor evaluation device for the abrasion resistance and polishing performance of road surface material disclosed in the present application can realize linear continuous loading on the test piece through the Lelos triangular steering disc to control the planar motion track of the abrasion wheel and the torque test wheel, ensure the stress balance and stability under polishing, simulate the real load environment of the road surface material, and ensure the scientific and reasonable polishing effect; at the same time, the continuous loading mode can meet the demand of high-speed operation of the equipment, greatly improve the polishing efficiency of the test piece, improve the accuracy and scientificity of the test results, accurately simulate the polishing effect of the wheel load on the road surface layer under laboratory conditions, and quickly realize the detection and evaluation of the abrasion resistance and polishing performance of the road surface material.

[0032] 2, the present application provides wear-resistant light performance index RD n As the evaluation index of polishing performance, the scientific quantitative characterization and evaluation of the wear-resistant light performance of the pavement material can be realized, and the pavement material design and performance evaluation work can be better served.

[0033] 3, the evaluation device provided by the present application is simple in structure, scientific and reasonable, easy to realize, can be used for indoor forming test piece, also can be used for new or existing road pavement sampling sample, makes the wear-resistant light performance test operation simple and easy, saves time and labor, is convenient for popularization and application, has extremely important engineering significance for studying the wear-resistant light performance of pavement material. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 It is the plane schematic view of the evaluation device of the present application;

[0035] Figure 2 It is the geometric principle diagram of the Luer triangle of the present application;

[0036] Figure 3 It is the structural schematic view of the steering control assembly of the present application; Figure 3 A is the overhead schematic view of the steering control assembly; Figure 3 B is the front view schematic view of the steering control assembly;

[0037] Figure 4 It is the structural schematic view of the spline shaft of the present application; Figure 4 A is the three-dimensional structural view of the spline shaft; Figure 4 B is the overhead schematic view of the spline shaft;

[0038] Figure 5 It is the layout schematic view of the steering control assembly of the present application; Figure 5 A1 is the three-dimensional schematic view when the steering control assembly is installed; Figure 5 A2 is Figure 5 the internal structure view of A1; Figure 5 B1 is the cross-sectional schematic view of the upper telescopic sleeve; Figure 5 B2 is the cross-sectional schematic view when the upper telescopic sleeve is connected with the spline shaft; Figure 5 C1 is the cross-sectional schematic view of the lower telescopic sleeve; Figure 5 C2 is the cross-sectional schematic view when the lower telescopic sleeve is connected with the spline shaft;

[0039] Figure 6 It is the installation schematic view of the load weight of the present application; Figure 6 A is the front view schematic view of the motion assembly; Figure 6 B is Figure 6 the overhead schematic view of A;

[0040] Figure 7 It is the structural schematic view of the motion assembly of the present application; Figure 7A is the main view schematic diagram of the motion assembly; Figure 7 B is the schematic diagram of the support expansion platform; Figure 7 C is the schematic diagram of the extension sleeve structure;

[0041] Figure 8 It is the layout plan of the wear assembly of the application;

[0042] Figure 9 It is the installation layout schematic diagram of the torque test wheel of the application; Figure 9 A is the installation connection schematic diagram of the torque test wheel; Figure 9 B is the side view of the torque test wheel; Figure 9 C is the main view schematic diagram of the torque test wheel; Figure 9 D is the schematic diagram of the wheel shaft;

[0043] Figure 10 It is the installation layout schematic diagram of the wear wheel of the application; Figure 10 A is the installation connection schematic diagram of the wear wheel; Figure 10 B is the side view of the wear wheel; Figure 10 C is the main view schematic diagram of the wear wheel;

[0044] Figure 11 It is the schematic diagram of the test platform structure of the application; Figure 11 A is the main view schematic diagram of the test platform; Figure 11 B is the side view of the fixed side plate;

[0045] Figure 12 It is the layout top view schematic diagram of the test piece on the test platform of the application;

[0046] Wherein:

[0047] 1 - test box; 11 - spraying device; 111 - water pipe, 112 - booster water pump; 12 - liquid film thickness detection device; 13 - drain hole;

[0048] 2 - power system; 21 - frequency converter; 22 - horizontal rotating shaft; 23 - driving gear; 24 - fixed support;

[0049] 3 - rotating system; 31 - driven gear; 32 - vertical rotating shaft; 33 - rotating speed sensor; 34 - fixed bearing; 35 - universal joint coupling; 36 - upper rotating part; 361 - upper rotating shaft; 362 - upper extension sleeve; 363 - upper extension cavity; 364 - upper sleeve inner wall sliding key groove;

[0050] 4 - steering control assembly; 41 - Luer triangle steering disc; 411 - rubber layer; 42 - limiting square; 421 - limiting groove; 43 - support frame; 44 - spline rotating shaft; 441 - sliding key tooth;

[0051] 5 - movement assembly; 51 - lower rotating part; 511 - lower rotating shaft; 512 - lower telescopic sleeve; 513 - lower telescopic cavity; 514 - lower sleeve inner wall sliding key groove; 52 - load weight; 521 - metal connecting sheet; 522 - fixing screw; 53 - bearing platform; 54 - support expansion platform; 541 - screw hole; 55 - expansion support; 551 - expansion sleeve; 552 - expansion rod; 553 - screw rod; 554 - fastening bolt;

[0052] 6 - wear monitoring assembly; 61 - hydraulic support rod; 62 - wear wheel; 621 - hard rubber layer; 63 - torque test wheel; 631 - smooth natural rubber pneumatic tire; 64 - universal wheel steering platform; 65 - universal wheel shaft frame; 66 - telemetry torque sensor; 67 - bearing; 68 - wheel shaft; 681 - shaft key; 69 - shaft hole;

[0053] 7 - test platform; 71 - test part; 72 - metal base; 73 - rubber cushion layer; 74 - fixed side plate; 741 - drain hole; 75 - movable front baffle; 751 - fixed pin; 76 - metal partition plate; 77 - wheel trace line;

[0054] 8 - central computer, 81 - connecting line, 82 - radio receiver. DETAILED DESCRIPTION

[0055] The present application will be described in detail with reference to the accompanying drawings and embodiments.

[0056] The indoor evaluation device for the wear resistance and light performance of pavement material comprises a test box 1 and, from top to bottom, a steering control assembly 4, a movement assembly 5, a wear monitoring assembly 6 and a test platform 7 arranged in the test box 1.

[0057] Referring to Figure 1 , the test box 1 is a hollow cube, a power system 2 is installed on the top of the test box 1, a rotating system 3 is installed on the top center of the test box 1, the rotating system 3 is connected with the power system 2 and rotates under the drive of the power system 2, the steering control assembly 4 is connected below the rotating system 3, the movement assembly 5 is connected below the steering control assembly 4, the wear monitoring assembly 6 is connected at the lower end of the movement assembly 5, the wear monitoring assembly 6 is in contact with the test part 71 placed on the upper surface of the test platform 7, and the test platform 7 is located on the inner bottom surface of the test box 1.

[0058] Referring to Figure 2, the power system 2 comprises a frequency converter 21 and a horizontal rotating shaft 22 which are located outside the test box 1 and are connected in sequence, respectively; the rotating system 3 comprises a vertical rotating shaft 32, a universal joint shaft 35 and an upper rotating part 36 which are connected in sequence from top to bottom and are all located inside the test box 1; the vertical rotating shaft 32 is connected with the horizontal rotating shaft 22 which is located outside the test box 1; the upper rotating part 36 is connected with the top end of the spline rotating shaft 44.

[0059] Specifically, the power system 2 is installed on the top of the test box 1 through a fixed support 24, one end of the horizontal rotating shaft 22 is connected with the power system 2, a driving gear 23 is installed on the other end of the horizontal rotating shaft 22, a driven gear 31 is arranged on the top end of the vertical rotating shaft 32, the driving gear 23 is engaged with the driven gear 31, the vertical rotating shaft 32 is fixed on the top center of the test box 1 through a fixed bearing 34 to support the whole rotating system 3; a rotating speed sensor 33 is installed on the vertical rotating shaft 32, the rotating speed sensor 33 is located outside the test box 1 and above the fixed bearing 34, and the rotating speed sensor 33 is used for monitoring the rotating speed of the driven gear 31.

[0060] The driving gear 23 and the driven gear 31 are both bevel gears.

[0061] The frequency converter 21 is connected with the central computer 8 through a connecting line 81, the rotating speed sensor 33 is connected with the central computer 8 through the connecting line 81, the rotating speed sensor 33 transmits the monitoring result of the rotating speed of the rotating system 3 to the central computer 8, the central computer 8 adjusts the operation of the frequency converter 21 according to the set rotating speed requirement to further control the rotating speed of the power system 2.

[0062] One end of the universal joint shaft 35 is connected with the vertical rotating shaft 32, and the other end of the universal joint shaft 35 is connected with the upper rotating part 36. Since the center point of the Luer triangle steering disc 41 makes a circular motion, the axis position of the upper rotating part 36 changes constantly, and the universal joint shaft 35 is used for realizing the power transmission between the vertical rotating shaft 32 and the upper rotating part 36 whose axes do not coincide.

[0063] Referring to Figure 1 The steering control assembly 4 comprises a limiting square frame 42 and a Luer triangle steering disc 41 which is arranged in the limiting square frame 42, the limiting square frame 42 and the Luer triangle steering disc 41 are both located above the motion assembly 5, the limiting square frame 42 is connected with the inner wall of the test box 1 through a support frame 43, the limiting square frame 42 is a square frame, the side length of the limiting square frame 42 is equal to the width of the Luer triangle steering disc 41; the Luer triangle steering disc 41 rotates along the limiting square frame 42 and drives the motion assembly 5 and the abrasion monitoring assembly 6 to rotate synchronously, the abrasion monitoring assembly 6 is in contact with the test platform 7 and makes a straight continuous loading motion on the surface of the test platform 7 in the form of a square track with a circular arc transition angle.

[0064] The steering control assembly 4 further comprises a spline shaft 44 above the Lohmann triangle steering disc 41; the bottom end of the spline shaft 44 penetrates the Lohmann triangle steering disc 41 downward and is connected with the motion assembly 5; when the Lohmann triangle steering disc 41 rotates, the spline shaft 44 and the center point of the Lohmann triangle steering disc 41 have the same motion track, which is a circle-like motion, the motion assembly 5 moves along the center point to the rotating edge in a circle-like motion, and then the motion assembly 5 drives the abrasion monitoring assembly 6 to rotate synchronously according to the motion track of the Lohmann triangle steering disc 41 when the motion assembly 5 rotates, so as to realize the polishing effect on the test piece 71 and the monitoring of the anti-polishing performance.

[0065] Referring to Figure 3 A and Figure 3 B, the horizontal cross section of the Lohmann triangle steering disc 41 is a Lohmann triangle, the line connecting the three vertices of the Lohmann triangle steering disc 41 forms an equilateral triangle, and the limiting square frame 42 is a square frame with a limiting groove 421; under the driving of the rotating system 3, the Lohmann triangle steering disc 41 can rotate in the limiting square frame 42, the center point of the Lohmann triangle steering disc 41 moves in a circle-like motion, the vertices of the Lohmann triangle steering disc 41 slide along the limiting groove 421, and the motion track of the three vertices of the Lohmann triangle steering disc 41 is a square with a circular arc transition angle.

[0066] Referring to Figure 2 , the Lohmann triangle is formed by three circles with the same size at the three vertices of the equilateral triangle, and the width of the Lohmann triangle is equal to the length of the side of the equilateral triangle; when the Lohmann triangle rotates in the square hole with the length of the side equal to the width of the Lohmann triangle, the track of each angle is basically a square with a circular arc transition angle.

[0067] Referring to Figure 3 B, the Lohmann triangle steering disc 41 is wrapped with a rubber layer 411 around the periphery to reduce the collision between the Lohmann triangle steering disc 41 and the limiting square frame 42. The limiting groove 421 can effectively prevent the vertical movement of the Lohmann triangle steering disc 41 during rotation, and the lower edge of the limiting groove 421 can be used to support the Lohmann triangle steering disc 41 to avoid the gravity of the rotating system 3 and the steering control assembly 4 acting on the motion assembly 5, so as to ensure the constancy of the load force acting on the motion assembly 5.

[0068] Referring to Figure 4 A and Figure 4 B, in implementation, the middle part of the Lohmann triangle steering disc 41 is fixed with a penetrating spline shaft 44, and the outer wall of the spline shaft 44 is provided with a sliding key tooth 441.

[0069] Referring to Figure 5 A1 and Figure 5A2, the axis of spline shaft 44 is located at the center of Luer triangle steering disc 41, when Luer triangle steering disc 41 rotates in the limit box 42, spline shaft 44 also does a circular motion while rotating. The upper end and lower end of spline shaft 44 are connected with upper rotating part 36 and lower rotating part 51 respectively, upper rotating part 36 is composed of upper rotating shaft 361 and upper telescopic sleeve 362, upper rotating shaft 361 is connected with universal joint shaft 35, upper telescopic sleeve 362 wraps part of the upper end of spline shaft 44; lower rotating part 51 is composed of lower rotating shaft 511 and lower telescopic sleeve 512, lower rotating shaft 511 is connected with support expansion platform 54, lower telescopic sleeve 512 wraps part of the lower end of spline shaft 44.

[0070] Referring to Figure 5 B1, Figure 5 B2, Figure 5 C1and Figure 5 C2, when implemented, the inner wall of upper telescopic sleeve 362 is provided with upper sleeve inner wall sliding key groove 364, the inner wall of lower telescopic sleeve 512 is provided with lower sleeve inner wall sliding key groove 514, upper sleeve inner wall sliding key groove 364 and lower sleeve inner wall sliding key groove 514 match with sliding key teeth 441 on the outer wall of spline shaft 44, so as to ensure that upper rotating part 36 and lower rotating part 51 can still effectively transmit torsional power when vertically moving relative to Luer triangle steering disc 41.

[0071] It is particularly pointed out that upper telescopic sleeve 362 and lower telescopic sleeve 512 are respectively provided with upper telescopic cavity 363 and lower telescopic cavity 513 between them and spline shaft 44, upper telescopic cavity 363 and lower telescopic cavity 513 allow upper rotating part 36 and lower rotating part 51 to move vertically relative to Luer triangle steering disc 41 respectively.

[0072] Referring to Figure 6 Aand Figure 6 B, movement assembly 5 includes lower rotating part 51, load weight 52, bearing platform 53, support expansion platform 54 and expansion support 55 connected in turn from top to bottom; lower rotating part 51 is connected with spline shaft 44 located above lower rotating part 51; expansion support 55 and wear monitoring assembly 6 are three, the top end of each of the three expansion supports 55 is connected with support expansion platform 54, and the bottom end of each of the three expansion supports 55 is connected with one wear monitoring assembly 6, and the connecting lines between the three wear monitoring assemblies form an equilateral triangle.

[0073] Referring to Figure 7A, in the implementation, the load weight 52 is located on the lower rotating shaft 511 of the lower rotating part 51, the load weight 52 is two half circular metal parts, and the two half circular metal parts are connected through a metal connecting sheet 521 and a fixing screw 522. The load weight 52 is provided with a circular hole in the center, and the lower rotating shaft 511 passes through the circular hole. The lower rotating shaft 511 is provided with a bearing platform 53 to stabilize the load weight 52.

[0074] It is particularly pointed out that the load weight 52 in the application can be a combination of multiple levels of weights to meet the needs of different load levels.

[0075] In the implementation, the support expansion platform 54 is provided with three screw holes 541 (see Figure 7 B) on the side surface at equal intervals, for placing three extension supports 55; the extension support 55 is composed of an extension sleeve 551, an extension rod 552, a screw rod 553 and a fastening bolt 554; the end of the extension sleeve 551 is provided with the screw rod 553 (see Figure 7 C), the screw rod 553 can be inserted into the screw hole 541 to fix the extension support 55; the extension rod 552 is connected with the extension sleeve 551 and is fixed by the fastening bolt 554.

[0076] Referring to Figure 8 , the lengths of the three extension supports 55 need to be kept consistent, the plane positions of the abrasion wheel 62 and the torque test wheel 63 are the three vertices of an equilateral triangle, and the movement wheel traces 77 of the abrasion wheel 62 and the torque test wheel 63 on the test piece 71 are a square with a circular arc transition angle. The wheel traces 77 of the abrasion wheel 62 and the torque test wheel 63 on each test piece 71 are a straight line segment.

[0077] It is particularly pointed out that the length of the extension rod 552 can be freely adjusted according to the need for the action position of the abrasion monitoring assembly 6 on the test piece 71, and finally the end of the extension rod 552 is vertically downward.

[0078] The three abrasion monitoring assemblies 6 are two abrasion wheels 62 and one torque test wheel 63, and the connecting line between the three is an equilateral triangle, one torque test wheel 63 and two abrasion wheels 62 are connected with the three extension supports 55 one by one, and the torque test wheel 63 is provided with a remote torque sensor 66; the abrasion wheel 62 and the torque test wheel 63 are located above the test platform 7 and contact the test platform 7.

[0079] The three abrasion monitoring assemblies 6 are two abrasion wheels 62 and one torque test wheel 63, the abrasion wheel 62 is used for accelerating polishing of the test piece 71, and the torque test wheel 63 is used for monitoring the change condition of the surface roughness of the test piece 71. The abrasion monitoring assembly 6 further comprises a hydraulic support rod 61, a universal wheel steering platform 64, a universal wheel shaft support 65, a bearing 67 and a wheel shaft 68.

[0080] Referring toFigure 9 When the wear wheel 62 is installed, one end of the hydraulic support rod 61 is fixed on the extension rod 552, and the other end is connected with the universal wheel steering platform 64. The universal wheel steering platform 64 is connected with the universal wheel shaft support 65 at the lower end. The wear wheel 62 is provided with a shaft hole 69 at the center, and the wheel shaft 68 passes through the shaft hole 69 to fix the wear wheel 62 in the universal wheel shaft support 65. The universal wheel shaft support 65 can drive the wear wheel 62 to rotate freely in the horizontal plane. The wheel shaft 68 of the wear wheel 62 is connected with the universal wheel shaft support 65 through the bearing 67 at both ends, and the bearing 67 allows the wear wheel 62 to drive the wheel shaft 68 to rotate freely.

[0081] Referring to Figure 10 When the torque test wheel 63 is installed, one end of the hydraulic support rod 61 is fixed on the extension rod 552, and the other end is connected with the universal wheel steering platform 64. The universal wheel steering platform 64 is connected with the universal wheel shaft support 65 at the lower end. The torque test wheel 63 is also provided with a shaft hole 69 at the center, and the wheel shaft 68 passes through the shaft hole 69 to fix the torque test wheel 63 in the universal wheel shaft support 65. The universal wheel shaft support 65 can drive the torque test wheel 63 to rotate freely in the horizontal plane. The wheel shaft 68 of the torque test wheel 63 is connected with the universal wheel shaft support 65 through the telemetry torque sensor 66 and the bearing 67 at both ends, and the telemetry torque sensor 66 and the bearing 67 allow the torque test wheel 63 to drive the wheel shaft 68 to rotate freely. The telemetry torque sensor 66 can be used to measure the torque force generated by the friction force applied by the test piece 71 to the torque test wheel 63, and is transmitted to the radio receiver 82 by radio transmission.

[0082] In implementation, the wheel shaft 68 is provided with a shaft key 681 (see Figure 9 D), and the shape of the shaft hole 69 matches the cross-sectional shape of the wheel shaft 68, so as to realize the synchronous rotation of the wear wheel 62 and the torque test wheel 63 with the wheel shaft 68.

[0083] It is particularly pointed out that the uneven surface of the test piece 71 can effectively reduce the shaking of the wear wheel 62 and the torque test wheel 63, and ensure the stability of the upper movement assembly 5 and the wear monitoring assembly 6. The universal wheel shaft support 65 is inclined to ensure the consistency of the direction of travel of the wear wheel 62 and the torque test wheel 63 during travel.

[0084] It is particularly pointed out that the wear wheel 62 is provided with a hard rubber layer 621 on the outside, and the hardness of the hard rubber layer 621 is preferably 66-72 IRHD.

[0085] It is particularly pointed out that the torque test wheel 63 is provided with a smooth natural rubber pneumatic tire 631 on the outside, and the air pressure range is preferably 66.5-73.5 kPa.

[0086] Referring to Figure 11The test platform 7 comprises a metal base 72 and a rubber pad 73 arranged on the upper surface of the metal base 72; the test piece 71 is arranged on the rubber pad 73, and the abrasion wheel 62 and the torque test wheel 63 are in contact with the test piece 71.

[0087] The test platform 7 further comprises metal partition plates 76 arranged on the rubber pad 73 and connected with the metal base 72, the metal partition plates 76 are multiple, and the multiple metal partition plates 76 divide the upper surface of the metal base 72 into four areas of equal size, and the test piece 71 is arranged in each area.

[0088] In implementation, the metal partition plates 76 are four, which divide the upper surface of the metal base 72 into four areas of equal size, and the four metal partition plates 76 do not intersect.

[0089] In this embodiment, the rubber pad 73 is arranged on the metal base 72 first, and then the metal partition plates 76 are arranged; however, there is another implementation manner, that is, the metal partition plates 76 are arranged on the metal base 72 first, and then the rubber pads 73 are arranged on the metal base 72 in the four areas.

[0090] In implementation, the metal base 72 is a rectangular metal plate, and the four perimeters of the metal base 72 are provided with fixed side plates 74 and a movable front baffle 75, the fixed side plates 74 are three, and the movable front baffle 75 is one, the movable front baffle 75 is installed between the two fixed side plates 74 through a fixed pin 751, and the movable front baffle 75 can be freely opened when the test piece 71 is loaded or unloaded.

[0091] In implementation, the fixed side plates 74 and the movable front baffle 75 are provided with drain holes 741 (see Figure 11 B), so that the water flow on the surface of the test piece 71 can flow out. The test box body 1 is provided with a drain hole 13 at the bottom to drain the water on the test piece 71 to the outside of the test box body 1.

[0092] The test piece 71 is located above the metal base 72, and the rubber pad 73 is arranged between the test piece 71 and the metal base 72 to simulate the base layer or the soil layer. The test platform 7 should meet the placement of four square test pieces 71 of the same size, and the metal partition plates 76 are arranged between the test pieces 71, and the thickness of the metal partition plates 76 is the same as the thickness of the test piece 71.

[0093] It is particularly pointed out that in order to realize the comparative test between different material types, different types of test pieces 71 can be arranged, and the thicknesses of the test pieces 71 must be consistent. In order to ensure that the test piece 71 is in close contact with the surrounding objects and prevent the test piece 71 from shaking during the test, a certain amount of rubber asbestos board can be filled between the test piece 71 and the fixed side plate 74, the movable front baffle 75 or the metal partition plate 76 according to the gap size.

[0094] Referring to Figure 12 In implementation, in order to ensure that the rounded corners of the wheel traces 77 of the wear wheel 62 and the torque test wheel 63 on the test piece 71 are located on the metal partition plate 76, there should be a rotation angle of 45° between the limiting square 42 and the projection of the test platform 7 on the horizontal plane.

[0095] The indoor evaluation device for the wear light performance of pavement materials further comprises a spraying device 11 and a liquid film thickness detection device 12 respectively arranged in the test box 1; the spraying device 11 has a nozzle end facing the upper surface of the test platform 7, and the liquid film thickness detection device 12 is located above the test platform 7.

[0096] Referring to Figure 1 Specifically, the spraying device 11 is connected with the booster water pump 112 through a water pipe 111, and is used to construct the road surface water film of the test piece 71 to simulate the rainfall condition; the liquid film thickness detection device 12 adopts an infrared non-contact mode to collect real-time information of the water film thickness, and transmits the data to the central computer 8 through the connection line 81; further, the central computer 8 controls the working state of the booster water pump 112 through the connection line 81.

[0097] In this embodiment, the central computer 8 is connected with the frequency converter 21, the liquid film thickness detection device 12, the booster water pump 112, the radio receiver 82 and the rotating speed sensor 33 through the connection line 81, so as to realize the setting and collection of the parameters of each component.

[0098] The test result of the wear monitoring assembly 6 is transmitted to the radio receiver 82 through wireless telemetry, and then is transmitted to the central computer 8 through the connection line 81 for analysis and processing, so as to realize the test and analysis of the accelerated wear light and the wear light performance of the test piece 71.

[0099] The present application controls the planar motion track of the wear wheel 62 and the torque test wheel 63 through the Luer triangle steering disc 41, realizes the linear continuous loading of the test piece 71, ensures the stress balance and stability under the wear light, can simulate the real load environment of the pavement material, ensures the scientific and reasonable wear light effect; at the same time, the continuous loading mode can meet the demand of high-speed operation of the equipment, and greatly improves the wear light efficiency of the test piece 71.

[0100] The present application provides an indoor evaluation method for the wear light performance of pavement materials, which comprises the following steps:

[0101] 1) Prepare the test piece 71 according to the set size by preparing the rut plate sample or cutting the field pavement.

[0102] Specifically, the test piece 71 can be selected as an indoor formed rutting board test piece, or can be cut and processed into a sample on a new or existing road pavement site. It can be used for evaluating the wear resistance of asphalt concrete or cement concrete pavement materials. The test surface of the test piece 71 is the upper surface of the formed or sampled sample. The surface of the test piece 71 is guaranteed to be flat and free of floating sand, and the thickness between each test piece 71 should meet the design requirements.

[0103] 2) Place the test piece 71 of step 1) on the rubber pad 73 in each of the four areas of the indoor pavement material wear resistance evaluation device, and the upper surface of the test piece 71 is flush with the top surface of the metal partition plate 76. The wear wheel 62 and the torque test wheel 63 are in contact with the upper surface of the test piece 71.

[0104] Specifically, the movable front baffle 75 is opened, the rubber pad 73 and the metal partition plate 76 are placed in the test platform 7, the prepared square test piece 71 is closely arranged in the test platform 7, the rubber asbestos board is added, the test piece 71 is closely contacted, the test piece 71 is flush with the top surface of the metal partition plate 76, and finally the movable front baffle 75 is fastened by the fixing pin 751.

[0105] 3) Place the load weight 52 according to the design requirements, keep the load weight 52 stable, record the weight of the load weight 52, set the rotation speed of the rotation system 3 according to the test running speed, and set the total number of abrasion n.

[0106] Specifically, the test program is opened, the test running speed and the water film thickness are set by the central computer 8, the load weight is input, the central computer 8 automatically converts the set test speed into the rotation speed of the driven gear 31, and the data acquisition programs of the rotation speed sensor 33, the liquid film thickness detection device 12 and the radio receiver 82 are opened.

[0107] 4) Initially, the torque test wheel 63 is placed on the metal partition plate 76, and the position of the metal partition plate 76 is marked as the initial position. The initial torque data of the torque test wheel 63 is collected by the remote torque sensor 66.

[0108] 5) The power system 2 rotates at the set test running speed, the power system 2 drives the rotation system 3 to rotate, and in turn drives the spline shaft 44, the movement assembly 5 and the abrasion monitoring assembly 6 to rotate. The abrasion monitoring assembly 6 rotates synchronously according to the movement track of the Loe Triangle steering disc 41, that is, the wear wheel 62 and the torque test wheel 63 simultaneously make straight line continuous loading movement on the surface of the test piece 71 in a square track. The wear wheel 62 wears the test piece 71, and when the torque test wheel 63 returns to the initial position for the first time, the first wear is completed, and the torque data of the torque test wheel 63 for completing one wear is collected by the remote torque sensor 66.

[0109] Only when the movement tracks of the wear monitoring assembly 6 and the three vertices of the Lohmann triangle steering disc 41 are consistent, and the movement track of the spline rotating shaft 44 and the center point of the Lohmann triangle steering disc 41 is consistent, the movement of the assembly 5 along the center point of the Lohmann triangle steering disc 41 is a circular motion.

[0110] 6) Repeat step 5) until the n-th wear of the torque testing wheel 63 returns to the initial position, and collect the torque data of the n-th wear of the torque testing wheel 63 through the telemetry torque sensor 66;

[0111] 7) Substitute the data collected in the above steps 3) to 6) into the formula to calculate the wear-resistant light performance index RD n :

[0112]

[0113] In the formula:

[0114] R1 - the roughness value of the road surface material measured at the initial wear, i.e. the initial torque data;

[0115] R n - the roughness value of the road surface material measured at the n-th wear, i.e. the n-th wear torque data;

[0116] F - the weight of the load weight 52;

[0117] n - the number of wear.

[0118] In steps 4) and 5), when the test piece 71 is worn, the spraying device 11 is opened or closed according to the use environment of the test piece 71. When simulating the use environment of a dry road surface, no watering operation is performed, and the spraying device 11 is closed; when simulating the use environment of a wet road surface, the spraying device 11 is opened, water is sprayed on the test piece 71, and the thickness of the water film on the surface of the test piece 71 is measured through the liquid film thickness detection device 12.

[0119] The torque value is used to represent the roughness of the surface of the test piece 71, the metal partition plate 76 is preferably a smooth metal component, and the test result of the torque testing wheel 63 on the surface of the metal partition plate 76 can be ignored.

[0120] The abrasion monitoring assembly 6 is reset (generally, the torque testing wheel 63 is placed on the metal partition plate 76 in a determined position, facilitating data segmentation in the later stage), the total number of abrasion actions is set according to the designed cumulative equivalent shaft times, the equipment is started, and the accelerated abrasion operation and information collection work are carried out, the torque data of each testing piece 71 in the abrasion process and the change result with the abrasion times are calculated by the central computer 8, to represent the roughness of the testing piece 71 under the load condition and the water film thickness condition, and finally the collected data from the same testing piece 71 is averaged by the central computer 8, as the representative value R of the roughness of the testing piece 71 under the load action times n .

[0121] Further, the torque test data in the region of each testing piece 71 is segmented according to the minimum value of the torque test result, and the torque representative value of each testing piece 71 in a single cycle is calculated by the central computer 8, to represent the roughness of the surface of the corresponding testing piece 71 at this moment; the telemetry torque sensor 66 should preferably be a high-frequency data acquisition device, to ensure that a sufficient number of effective torque data can be collected on each testing piece 71.

[0122] Under the same test environment, for the same kind of road surface material, the abrasion resistance and light performance index RD n should be a constant value, according to which the comparison of the abrasion resistance and light performance of various types of road surface materials can be conveniently realized.

[0123] The measurement of the abrasion resistance and light performance is automatically completed by the programmed control software of the central computer 8, reducing the operation error of personnel.

[0124] After the test is completed, the torque test data in the region of each testing piece 71 is segmented according to the minimum value of the torque test result, that is, four abrasion torque data can be obtained in one cycle, if the four testing pieces 71 are the same type of testing piece, the four results are parallel tests, and the average value is taken as the representative value; if the four testing pieces 71 are different types of testing pieces, they are each result, and the comparison and analysis of the abrasion resistance and light performance of different material types can be realized by the device of the present application.

Claims

1. An indoor evaluation device for the abrasion resistance of road materials, characterized in that, The test chamber includes a test box (1) and a steering control component (4), a motion component (5), a wear monitoring component (6), and a test platform (7) arranged sequentially from top to bottom within the test chamber (1). The steering control component (4) includes a limiting frame (42) and a Reuleaux triangle steering wheel (41) placed within the limiting frame (42). The limiting frame (42) is a square frame, and the side length of the limiting frame (42) is equal to the width of the Reuleaux triangle steering wheel (41). The limiting frame (42) is connected to the inner wall of the test chamber (1). The Reuleaux triangle steering wheel (41) rotates along the limiting frame (42) and drives the motion component (5) and the wear monitoring component (6) to rotate synchronously. The wear monitoring component (6) contacts the test platform (7) and performs a linear continuous loading motion on the surface of the test platform (7) with a square trajectory with a rounded transition angle. The steering control assembly (4) also includes a spline shaft (44) located above the Reuleaux triangle steering wheel (41); the bottom end of the spline shaft (44) passes downward through the Reuleaux triangle steering wheel (41) and connects to the motion assembly (5); the spline shaft (44) drives the motion assembly (5) to rotate and drives the wear monitoring assembly (6) to rotate synchronously according to the motion trajectory of the Reuleaux triangle steering wheel (41); there are three wear monitoring assemblies (6), and the line connecting the three wear monitoring assemblies (6) forms an equilateral triangle; the three wear monitoring assemblies (6) consist of two wear wheels (62) and one torque test wheel (63), and the line connecting the three forms an equilateral triangle.

2. The indoor evaluation device for the abrasion resistance of road materials according to claim 1, characterized in that, The motion assembly (5) includes a lower rotating part (51), a load weight (52), a bearing platform (53), a support extension platform (54), and an extension bracket (55) connected sequentially from top to bottom; the lower rotating part (51) is connected to a spline shaft (44) located above the lower rotating part (51); there are three extension brackets (55), the top of each of the three extension brackets (55) is connected to the support extension platform (54), and a wear monitoring component (6) is connected to the bottom of each of the three extension brackets (55).

3. The indoor evaluation device for the abrasion resistance of road materials according to claim 2, characterized in that, A torque test wheel (63) and two wear wheels (62) are connected to three extension supports (55) in a one-to-one correspondence. A telemetry torque sensor (66) is provided on the torque test wheel (63). The wear wheels (62) and the torque test wheel (63) are both located above the test platform (7) and in contact with the test platform (7).

4. The indoor evaluation device for the abrasion resistance of road materials according to claim 3, characterized in that, The test platform (7) includes a metal base (72) and a rubber pad (73) placed on the upper surface of the metal base (72); the test piece (71) is placed on the rubber pad (73), and the wear wheel (62) and the torque test wheel (63) are in contact with the test piece (71).

5. The indoor evaluation device for the abrasion resistance of road materials according to claim 4, characterized in that, The test platform (7) also includes a metal partition plate (76) placed on the rubber pad layer (73) and connected to the metal base (72). There are multiple metal partition plates (76), and the multiple metal partition plates (76) divide the upper surface of the metal base (72) into four areas of equal size. The test piece (71) is placed on the rubber pad layer (73) in each of the four areas.

6. The indoor evaluation device for the abrasion resistance of road materials according to claim 5, characterized in that, The indoor evaluation device for the wear resistance of the road surface material also includes a rotating system (3) and a power system (2) connected to the rotating system (3); the power system (2) includes a frequency converter (21) and a horizontal rotating shaft (22) located outside the test chamber (1) and connected in sequence; the rotating system (3) includes a vertical rotating shaft (32), a universal joint coupling (35) and an upper rotating component (36) connected from top to bottom and all located inside the test chamber (1); the vertical rotating shaft (32) is also connected to the horizontal rotating shaft (22); the upper rotating component (36) is connected to the top of the spline rotating shaft (44).

7. The indoor evaluation device for the abrasion resistance of road materials according to claim 6, characterized in that, The indoor evaluation device for the abrasion resistance of the road surface material also includes a spray device (11) and a liquid film thickness detection device (12) respectively placed in the test chamber (1); the nozzle end of the spray device (11) faces the upper surface of the test platform (7), and the liquid film thickness detection device (12) is located above the test platform (7).

8. An indoor evaluation method for the abrasion resistance of road surface materials, characterized in that, Includes the following steps: 1) Prepare rut slab samples or cut road surfaces according to the set dimensions, and prepare four test pieces (71); 2) Place the four test pieces (71) from step 1) on the rubber pads (73) in the four areas of the indoor evaluation device for the wear resistance of road materials as described in claim 7. The upper surface of the test piece (71) is flush with the top surface of the metal partition plate (76), and the wear wheel (62) and the torque test wheel (63) are in contact with the upper surface of the test piece (71). 3) Place the load weight (52) according to the design requirements and keep the load weight (52) stable. Record the weight of the load weight (52). Set the rotation speed of the rotating system (3) and the total number of wear cycles n according to the test travel speed. 4) Initially, place the torque test wheel (63) on the metal partition plate (76) and mark the position of the metal partition plate (76) as the initial position. Start the operation and collect the initial torque data of the torque test wheel (63) through the telemetry torque sensor (66). 5) The power system (2) rotates at the set test travel speed. The power system (2) drives the rotation system (3) to rotate. Under the action of the spline shaft (44) and the motion component (5), the wear monitoring component (6) is driven to rotate synchronously according to the motion trajectory of the Reuleaux triangle steering wheel (41). The wear wheel (62) and the torque test wheel (63) simultaneously perform a straight continuous loading motion on the surface of the test piece (71) with a square trajectory with a rounded transition angle to wear the test piece (71). When the torque test wheel (63) returns to the initial position for the first time, the first wear is completed. The torque data of the torque test wheel (63) after the first wear is collected by the telemetry torque sensor (66). 6) Repeat step 5) until the torque test wheel (63) returns to the initial position for the nth time to complete the nth wear, and collect the torque data of the torque test wheel (63) after the nth wear through the telemetry torque sensor (66); 7) Substitute the data collected in steps 3) to 6) above into the formula to calculate the abrasion resistance index RD. n : In the formula: R1—The roughness value of the road surface material measured at the initial wear stage, i.e., the initial torque data; R n —The roughness value of the road material measured when the nth wear is achieved; that is, the torque data of the nth wear. F—The weight of the load weight (52); n—Number of wear cycles.

9. The indoor evaluation method for the abrasion resistance of road materials according to claim 8, characterized in that, In steps 4) and 5), when the test piece (71) is worn, the spray device (11) is turned on or off according to the usage environment of the test piece (71).

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