A device for generating water film for road surface skid resistance testing and its usage method

Abstract

This invention relates to a water film generation device for road surface skid resistance testing and its usage method. A load-bearing vehicle travels along the test road surface, and the water film thickness is measured by the water film detection device. The lateral force testing device adopts the lateral force coefficient testing system in the standard specifications. The water film generation device covers the original road surface with a water film of uniform thickness, achieving objective, accurate, and stable skid resistance test data. A balance frame installed at the bottom of the load-bearing vehicle can adjust the pressure between the extrusion wheel and the road surface, enabling fine-tuning of the water film thickness. In the water film generation device, the extrusion wheel compresses the road surface water film into three parts for easy thickness calculation. An air scraper located below the baffle plate further refines the water film, ensuring uniform thickness and more accurate thickness detection results. The extrusion wheel is mounted on and rotatably connected to a support shaft. A speed measuring encoder on the support shaft measures the rotational speed, ensuring that the extrusion wheel is in a rolling state rather than a sliding state during the test.

Description

Technical Field

[0001] This invention relates to the field of road testing equipment technology, and in particular to a road surface anti-skid testing water film generation device and its usage method. Background Technology

[0002] The road surface friction coefficient (SFC) is one of the important indicators of road surface quality. Road surface inspection is generally carried out by a lateral force coefficient testing vehicle. For the determination of the SFC value, the SCRIM system is introduced into the standard system for measuring the SFC. As a supplement to large-scale equipment in practical applications, the Mu-meter friction coefficient testing system and its testing methods are also included in the standards. Both the SCRIM and Mu-meter systems require water to be sprayed in front of the test wheels during testing to wet the road surface, thus simulating the most unfavorable driving conditions in rainy weather. Furthermore, to ensure relatively stable testing conditions, certain requirements are set for the thickness of the water film on the road surface during testing.

[0003] Currently used testing vehicle equipment includes a water supply device that can control the flow rate at the outlet; however, the flow rate control cannot effectively control the distribution of water after it is sprayed onto the road surface, the thickness of the water film on the road surface, and the wetness of the tires, resulting in uneven water film thickness. This leads to distortion of the friction data collected by the test wheel, which in turn causes deviations when evaluating the anti-skid performance of the road surface. Summary of the Invention

[0004] This invention provides a water film generation device for road surface anti-skid testing and its usage method, which can effectively solve the problems in the background art.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] A road surface anti-skid testing water film generating device includes a load-bearing vehicle and a lateral force testing device, a water film testing device, a water film generating device, and a water spraying device arranged sequentially at its bottom along its direction of travel. A water tank and a control system are also provided on the load-bearing vehicle.

[0007] A balance frame is also provided at the bottom of the load-bearing vehicle. The balance frame includes a support frame, an adjustment component, and a mounting frame. The mounting frame is connected to the support frame through the adjustment component. The support frame is connected to the load-bearing vehicle. The water film generating device and the water film detection device are both mounted on the mounting frame.

[0008] The water film generating device includes a baffle plate and a squeezing wheel disposed therein. The squeezing wheel is mounted on a support shaft and rotatably connected thereto. Both the support shaft and the baffle plate are fixed on the mounting frame. The water film detection device is disposed corresponding to the squeezing wheel.

[0009] The lateral force testing device includes a mounting base and a test wheel mounted thereon, the test wheel being rotatably connected to the mounting base via a drive shaft.

[0010] Furthermore, the outer ring of the extrusion wheel is provided with a smooth surface and a toothed surface, both of which are made of rubber.

[0011] The tooth surface radius is larger than the smooth surface radius, and the tooth surface is symmetrically arranged on both sides of the smooth surface along the axial direction of the extrusion wheel.

[0012] Furthermore, the water film detection device includes a plurality of laser ranging probes arranged along the axial direction of the extrusion wheel, the laser ranging probes being oriented towards the road surface;

[0013] At least three laser ranging probes are provided, and they are respectively arranged to correspond to the optical surface and the two toothed surfaces.

[0014] Furthermore, the water baffle includes a front baffle and a rear baffle, and an air scraper is provided at the bottom of the rear baffle;

[0015] The air scraper is arranged along the axial direction of the extrusion wheel, and its side facing the road surface is set as an arc-shaped plate surface, which gradually moves away from the road surface along the direction of travel of the load-bearing vehicle.

[0016] Furthermore, the front baffle is arranged above the extrusion wheel along the circumference, and the rear baffle includes an arc plate and a corresponding side plate. The arc plate is arranged along the circumference of the extrusion wheel, and the side plates are symmetrically arranged on both sides of the extrusion wheel.

[0017] A water collection trough is provided at the bottom of both the arc plate and the side plate facing the extrusion wheel. Drainage holes are provided at both ends of the water collection trough at the bottom of the arc plate. The air scraper is located at the bottom of the arc plate.

[0018] Furthermore, the adjustment assembly includes a pneumatic arm, a first connecting shaft, a second connecting shaft, and a third connecting shaft, wherein the first connecting shaft, the second connecting shaft, and the third connecting shaft are arranged parallel to each other in the horizontal and vertical directions, respectively.

[0019] The pneumatic boom, the first connecting shaft, the second connecting shaft, and the third connecting shaft are respectively hinged to the support frame and the mounting frame, and the rotation axis at the hinge is set in the horizontal direction.

[0020] Furthermore, a limiting part is provided on the support shaft, a limiting groove is provided at the axis of the extrusion wheel corresponding to the limiting part, and a speed measuring code disk is sleeved on the support shaft corresponding to the extrusion wheel;

[0021] The two sides of the extrusion wheel are recessed towards its axis, the limiting part is configured as a spherical structure, the limiting groove is configured as an arc groove, and the wrap angle of the limiting groove is greater than 180°.

[0022] Furthermore, a supporting rib is provided in each of the outer teeth of the tooth surface, and the supporting rib includes a plurality of supporting seats arranged along its length direction, and two adjacent supporting seats are hinged together.

[0023] The support base is configured as a T-shaped structure, including a base plate and a support plate disposed thereon. The end of the support plate away from the base plate is configured as an arc surface, and male connectors and female connectors are respectively provided at both ends of the length of the base plate.

[0024] A method for using a road surface anti-skid testing water film generating device, comprising the following steps:

[0025] Test and inspect the load-bearing vehicle and its lateral force testing device, water film detection device, water film generating device and water spraying device, and start the control system;

[0026] After passing the pre-running section, the heavy-duty vehicle enters the test section at a constant speed. The water spraying device is turned on in the pre-running section, and the water film generating device is put into working state. The control system collects the detection data of the water film detection device and the lateral force testing device.

[0027] Calculate the water film thickness based on the detection data from the water film detection device, and determine whether the water spraying device or the water film generating device needs to be adjusted.

[0028] The vehicle leaves the test section, the lateral force testing device, water film generating device and water spraying device are restored to their initial state, and the control system is stopped to end the test.

[0029] Furthermore, the water film thickness h is calculated using the following formula:

[0030] h = H1 - (H2 + H3) / 2 + H0;

[0031] Wherein, H1 represents the detection data of the laser ranging probe set on the corresponding light surface, H2 and H3 represent the detection data of the laser ranging probe set on the two tooth surfaces on both sides of the corresponding light surface, and H0 represents the thickness of the water film in the middle wetted area generated at the corresponding light surface.

[0032] If the water film thickness does not meet the set value, first adjust the flow rate of the water spraying device, and then adjust the contact pressure between the squeezing wheel and the road surface.

[0033] The beneficial effects of this invention are as follows:

[0034] In this invention, a load-bearing vehicle travels along the test road surface, and a water film of uniform thickness is generated on the road surface by a water film generating device. The thickness of the water film is detected by a water film detection device, and the lateral force testing device adopts the lateral force coefficient testing system in the standard specifications. After passing through the water film generating device, the original road surface is covered with a water film of uniform thickness, achieving the effect of objective, true, and stable anti-skid test data.

[0035] The balance frame installed at the bottom of the load-bearing vehicle can adjust the pressure between the extrusion roller and the road surface, enabling fine-tuning of the water film thickness. In the water film generation device, the extrusion roller squeezes the water film on the road surface into three parts to facilitate the measurement of the water film thickness. In conjunction with the air scraper set below the baffle plate, the water film is trimmed to make the water film thickness uniform and the thickness measurement results more accurate. Attached Figure Description

[0036] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0037] Figure 1 This is a schematic diagram of the structure of the load-bearing vehicle in this invention;

[0038] Figure 2 This is a schematic diagram of the water film generation device in this invention;

[0039] Figure 3 This is a schematic diagram of the balance frame structure in this invention;

[0040] Figure 4 This is a schematic diagram of the water baffle plate in this invention;

[0041] Figure 5 This is a schematic diagram of the support shaft structure in this invention;

[0042] Figure 6 This is a schematic diagram of the extrusion wheel in this invention;

[0043] Figure 7 for Figure 6 Enlarged view of the local structure at point A;

[0044] Figure 8 This is a schematic diagram of the transverse force testing device in this invention;

[0045] Figure 9 This is a schematic diagram of the supporting rib structure in this invention;

[0046] Figure 10 This is a schematic diagram of the support base in this invention;

[0047] Figure 11 This is a schematic diagram of the water spraying device in this invention.

[0048] Reference numerals: 1. Load-bearing vehicle; 2. Balance frame; 21. Support frame; 22. Adjustment assembly; 221. Pneumatic boom; 222. First connecting shaft; 223. Second connecting shaft; 224. Third connecting shaft; 23. Mounting frame; 3. Lateral force testing device; 31. Mounting base; 32. Test wheel; 33. Drive shaft; 4. Water film detection device; 41. Laser rangefinder probe; 5. Water film generating device; 51. Water baffle; 511. Front baffle; 512. Rear baffle; 513. a. Arc plate; 512b. Side plate; 513. Water collection trough; 514. Drain hole; 515. Air scraper; 515a. Arc-shaped plate surface; 52. Extrusion wheel; 521. Smooth surface; 522. Toothed surface; 523. Limiting groove; 524. Supporting rib; 525. Support base; 525a. Base plate; 525b. Support plate; 525c. Male connector; 525d. Female connector; 53. Support shaft; 531. Limiting part; 54. Speed ​​measuring code; 6. Sprinkler device; 7. Water tank. Detailed Implementation

[0049] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0050] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0051] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0052] like Figures 1 to 11The illustrated road surface skid resistance testing water film generation device includes a load-bearing vehicle 1 and, sequentially arranged at its bottom along its direction of travel, a lateral force testing device 3, a water film detection device 4, a water film generation device 5, and a water spraying device 6. A water tank 7 and a control system are also mounted on the load-bearing vehicle 1. In this invention, the load-bearing vehicle 1 travels along the test road surface, and the control system controls the water spraying device 6 to spray water on the road surface in front of the water film generation device 5. After the water film generation device 5 generates a water film of uniform thickness on the road surface, the water film detection device 4 detects the thickness of the water film. The lateral force testing device 3 adopts a lateral force coefficient testing system according to standard specifications.

[0053] A balance frame 2 is also provided at the bottom of the load-bearing vehicle 1. The balance frame 2 includes a support frame 21, an adjustment component 22, and a mounting frame 23. The mounting frame 23 is connected to the support frame 21 through the adjustment component 22. The support frame 21 is connected to the load-bearing vehicle 1. The water film generating device 5 and the water film detection device 4 are both installed on the mounting frame 23. The water film generating device 5 includes a baffle plate 51 and a squeezing wheel 52 installed therein. The squeezing wheel 52 is installed on a support shaft 53 and rotatably connected to it. The support shaft 53 and the baffle plate 51 are both fixed on the mounting frame 23. The water film detection device 4 is correspondingly installed with the squeezing wheel 52. The lateral force testing device 3 includes a mounting base 31 and a test wheel 32 installed thereon. The test wheel 32 is rotatably connected to the mounting base 31 through a drive shaft 33.

[0054] The lateral force testing device 3, water film detection device 4, and water film generating device 5, located at the bottom of the load-bearing vehicle 1, can be adjusted in vertical height for easy lowering during operation and retraction after testing. The control system can control the spraying volume through the water spraying device 6. The extrusion wheel 52 contacts the road surface and the pressure between it and the road surface is adjusted by the balance frame 2. The water film detection device 4 detects the thickness of the water film generated on the road surface in real time and feeds the collected data back to the control system to correct the thickness deviation. Specifically, the pressure between the extrusion wheel 52 and the road surface is adjusted by the balance frame 2 to achieve the adjustment of the water film thickness.

[0055] In this invention, the water film on the road surface is squeezed into three parts by the extrusion wheel 52 to facilitate the measurement of the water film thickness. The air scraper 515, located below the baffle plate 51, further refines the water film, resulting in a uniform water film thickness and more accurate thickness measurement results. Figure 6 As shown, a smooth surface 521 and a toothed surface 522 are provided on the outer ring of the extrusion wheel 52. Both the toothed surface 522 and the smooth surface 521 are made of rubber. The radius of the toothed surface 522 is larger than the radius of the smooth surface 521, and the toothed surface 522 is symmetrically arranged on both sides of the smooth surface 521 along the axial direction of the extrusion wheel 52. See further details. Figure 3 As shown, the water film detection device 4 includes multiple laser ranging probes 41 arranged along the axial direction of the extrusion wheel 52, with the laser ranging probes 41 facing the road surface; at least three laser ranging probes 41 are provided, and they are respectively arranged corresponding to the smooth surface 521 and the two toothed surfaces 522.

[0056] During the formation of a water film of uniform thickness, the water spraying device 6 controls the flow rate through the control system and sprays approximately 2 ± 0.2 kg / m² in front of the water film forming device 5. 2 A base water film with a width of 35-40cm is sprayed. The toothed surface 522 and smooth surface 521 on the outer ring of the extrusion wheel 52 squeeze the water film into three parts during the rolling process on the road surface, including the middle wetted area and the two sheet-like water strips on both sides. The distance data is collected by three laser ranging probes 41 set behind the water film generating device 5, one corresponding to the middle wetted area and two corresponding to the middle of the left and right water strips respectively. The real-time water film thickness is calculated by the control system.

[0057] Furthermore, such as Figure 5 The structure of the baffle 51 shown includes a front baffle 511 and a rear baffle 512. An air scraper 515 is provided at the bottom of the rear baffle 512. The air scraper 515 is arranged along the axial direction of the extrusion wheel 52, and its side facing the road surface is set as an arc-shaped plate surface 515a. The arc-shaped plate surface 515a gradually moves away from the road surface along the travel direction of the load-bearing vehicle 1.

[0058] The air scraper 515, which is set at the bottom of the rear baffle 512, is suspended and does not come into contact with the water film. When the load-bearing vehicle 1 is traveling at high speed, the air scraper 515 further compresses the high-speed airflow passing between it and the road surface and acts on the water film. After the extrusion wheel 52 extrudes the water film into three parts, the water strip is trimmed by the air scraper 515 to form a water film of uniform thickness.

[0059] like Figure 4 and Figure 5 The structure of the baffle plate 51 shown has a front baffle plate 511 arranged circumferentially above the extrusion roller 52, and a rear baffle plate 512 including an arc plate 512a and a corresponding side plate 512b. The arc plate 512a is arranged circumferentially along the extrusion roller 52, and the side plates 512b are symmetrically arranged on both sides of the extrusion roller 52. A water collection groove 513 is provided at the bottom of both the arc plate 512a and the side plate 512b facing the extrusion roller 52. Drainage holes 514 are provided at both ends of the water collection groove 513 located at the bottom of the arc plate 512a. An air scraper 515 is located at the bottom of the arc plate 512a.

[0060] The front baffle 511, the rear baffle 512, and the water collection tank 513 at the bottom ensure that the water splashed by the extrusion wheel 52 during its rolling rotation falls back into the bottom water collection tank 513 after splashing onto the baffles, and is finally discharged through the drainage hole 514 on the side, reducing the impact on the generated water belt and the laser rangefinder 41.

[0061] In this invention, such as Figure 3The adjustment assembly 22 shown includes a pneumatic arm 221, a first connecting shaft 222, a second connecting shaft 223, and a third connecting shaft 224. The first connecting shaft 222 is parallel to the second connecting shaft 223 and the third connecting shaft 224 in the horizontal and vertical directions, respectively. The pneumatic arm 221, the first connecting shaft 222, the second connecting shaft 223, and the third connecting shaft 224 are hinged to the support frame 21 and the mounting frame 23, respectively, and the rotation axis at the hinge is set in the horizontal direction.

[0062] The pneumatic arm 221 in the balance frame 2 drives the extrusion wheel 52 to move up and down, thereby achieving fine adjustment of the pressure, ensuring that the water film is generated and the detection device moves vertically, and keeping the contact pressure between the extrusion wheel 52 and the ground within the set range. The adjustment range of the contact pressure is usually 0.5 to 1.0 kN.

[0063] See further Figure 5 The extrusion wheel 52 support structure shown has a limiting part 531 on the support shaft 53, and a limiting groove 523 corresponding to the limiting part 531 at the axis of the extrusion wheel 52. A speed measuring code disk 54 is sleeved on the support shaft 53 corresponding to the extrusion wheel 52. The two sides of the extrusion wheel 52 are recessed towards its axis. The limiting part 531 is a spherical structure, and the limiting groove 523 is an arc groove with a wrap angle greater than 180°.

[0064] The speed measuring encoder 54 is used to measure the real-time rotational speed of the extrusion roller 52 during the test, ensuring that the extrusion roller 52 is in a rolling state rather than a sliding state during the test. The support shaft 53 and the extrusion roller 52 are rotatably connected through the ball-shaped limiting part 531 and the limiting groove 523, which enables the extrusion roller 52 to swing at a small angle of ±6° in the axial direction of the support shaft 53, further ensuring the adhesion effect between the extrusion roller 52 and the road surface.

[0065] like Figure 7 As shown, a supporting rib 524 is correspondingly provided in each of the external teeth on the tooth surface 522. See further details. Figure 9 and Figure 10 As shown, the supporting rib 524 includes a plurality of support seats 525 arranged along its length, and adjacent support seats 525 are hinged together; the support seat 525 is configured as a T-shaped structure, including a base plate 525a and a support plate 525b disposed thereon, the end of the support plate 525b away from the base plate 525a is configured as an arc surface, and a male connector 525c and a female connector 525d are respectively provided at both ends of the length of the base plate 525a.

[0066] The extrusion wheel 52 is hollow inside, and inflation ensures that the outer ring tooth surface 522 is in full contact with the road surface. The inflation pressure ranges from 0.15 to 0.3 MPa, and the tire pressure can be adjusted according to the effect of forming a water film with the road surface. Each outer tooth of the extrusion wheel 52 contains an outer tooth support rib 524. The support rib 524 is composed of several support seats 525 connected together. Adjacent support seats 525 are hinged, and the rotational connection between adjacent support seats 525 is achieved through male connectors 525c and female connectors 525d located on both sides of its base plate 525a. This allows the support rib 524 to bend along its length, further ensuring the adhesion between the extrusion wheel 52 tread and the ground. The outer teeth of the tooth surface 522 are triangular with rounded corners, and the surface is coated with a hydrophobic material.

[0067] The present invention further discloses a method for using the above-mentioned road surface anti-skid testing water film generation device, including the following steps:

[0068] The load-bearing vehicle and its lateral force testing device, water film detection device, water film generating device, and water spraying device are tested and inspected, and the control system is activated. After passing through the pre-running section, the load-bearing vehicle enters the test section at a constant speed. The water spraying device is activated in the pre-running section, and the water film generating device is put into working condition. The control system collects the detection data of the water film detection device and the lateral force testing device. The water film thickness is calculated based on the detection data of the water film detection device to determine whether the water spraying device or the water film generating device needs to be adjusted. After the load-bearing vehicle leaves the test section, the lateral force testing device, water film generating device, and water spraying device are restored to their initial state, and the control system is stopped to end the test.

[0069] The water film thickness h is calculated using the following formula:

[0070] h = H1 - (H2 + H3) / 2 + H0;

[0071] Wherein, H1 represents the detection data of the laser ranging probe set on the corresponding smooth surface, H2 and H3 represent the detection data of the laser ranging probe set on the two toothed surfaces on both sides of the corresponding smooth surface, and H0 represents the thickness of the water film in the middle wet area generated at the corresponding smooth surface; when the water film thickness does not meet the set value, first adjust the flow rate of the water spraying device, and then adjust the contact pressure between the extrusion wheel and the road surface.

[0072] When the control system obtains the real-time thickness of the water film generated on the road surface based on data collected by the water film detection device, if the water film thickness is thin, the road surface is too dry, resulting in an overestimation of the friction test result; if the water film thickness is thick, the test wheel will experience water drift, resulting in an underestimation of the friction test result. If the detected water film thickness is too low, first adjust the water flow rate of the sprinkler nozzle to determine if there is insufficient water, then adjust the pneumatic arm to reduce the contact pressure between the extrusion wheel and the ground, while simultaneously observing the reading on the speed measuring dial to prevent the extrusion wheel from slipping; if the detected water film thickness is too high, first adjust the pneumatic arm to increase the contact pressure between the extrusion wheel and the ground, then simultaneously slightly adjust the water flow rate to conserve water. Since the anti-skid test water film thickness is a fixed thickness, the toothed surface of the water film generating device is designed to be higher than the smooth surface.

[0073] In the preparation process before testing, the tire pressure of the test tires should be checked according to the specifications and should reach the standard tire pressure specified for the vehicle (3.5±0.2) kg / cm². 2 Check the wear of the test wheel and ensure that the fixing bolts of the test wheel are tightened. Place the test wheel in the test position. The midpoint of the test wheel's contact with the ground should be offset by 10cm from the center line of the water film generating device, so that it corresponds to any one of the water band areas on both sides of the wetted area of ​​the generated water film.

[0074] During the calculation of the water film thickness, the collected data of each water film thickness detection device are monitored at all times and the water film thickness h is calculated to ensure that the water film thickness is between 1.0 and 1.2 mm. H2 and H3 are the distances between the two sheet-like water strips and the sensors. The average value is taken to eliminate the influence of the lateral fluctuation of the road surface on the detection results. H1 is the distance between the middle wet area and the sensor. H0 is the thickness of the water film in the middle wet area, which is determined by the difference in radius between the toothed surface and the smooth surface.

[0075] Those skilled in the art should understand that this invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to this invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A water film generation device for road surface skid resistance testing, characterized in that, It includes a load-bearing vehicle and a lateral force testing device, a water film detection device, a water film generating device, and a water spraying device arranged sequentially on its bottom along its direction of travel. A water tank and a control system are also installed on the load-bearing vehicle. A balance frame is also provided at the bottom of the load-bearing vehicle. The balance frame includes a support frame, an adjustment component, and a mounting frame. The mounting frame is connected to the support frame through the adjustment component. The support frame is connected to the load-bearing vehicle. The water film generating device and the water film detection device are both mounted on the mounting frame. The water film generating device includes a baffle plate and a squeezing wheel disposed therein. The squeezing wheel is mounted on a support shaft and rotatably connected thereto. Both the support shaft and the baffle plate are fixed on the mounting frame. The water film detection device is disposed corresponding to the squeezing wheel. The lateral force testing device includes a mounting base and a test wheel disposed thereon, the test wheel being rotatably connected to the mounting base via a drive shaft; The outer ring of the extrusion wheel is provided with a smooth surface and a toothed surface, both of which are made of rubber. The tooth surface radius is larger than the smooth surface radius, and the tooth surface is symmetrically arranged on both sides of the smooth surface along the axial direction of the extrusion wheel.

2. The road surface anti-skid testing water film generation device according to claim 1, characterized in that, The water film detection device includes a plurality of laser ranging probes arranged along the axial direction of the extrusion wheel, and the laser ranging probes are positioned facing the road surface; At least three laser ranging probes are provided, and they are respectively arranged to correspond to the optical surface and the two toothed surfaces.

3. The road surface anti-skid testing water film generation device according to claim 1, characterized in that, The water baffle includes a front baffle and a rear baffle, and an air scraper is provided at the bottom of the rear baffle; The air scraper is arranged along the axial direction of the extrusion wheel, and its side facing the road surface is set as an arc-shaped plate surface, which gradually moves away from the road surface along the direction of travel of the load-bearing vehicle.

4. The road surface anti-skid testing water film generation device according to claim 3, characterized in that, The front baffle is arranged above the extrusion wheel along the circumference of the extrusion wheel, and the rear baffle includes an arc plate and a corresponding side plate. The arc plate is arranged along the circumference of the extrusion wheel, and the side plates are symmetrically arranged on both sides of the extrusion wheel. A water collection trough is provided at the bottom of both the arc plate and the side plate facing the extrusion wheel. Drainage holes are provided at both ends of the water collection trough at the bottom of the arc plate. The air scraper is located at the bottom of the arc plate.

5. The road surface anti-skid testing water film generation device according to claim 1, characterized in that, The adjustment assembly includes a pneumatic arm, a first connecting shaft, a second connecting shaft, and a third connecting shaft, wherein the first connecting shaft, the second connecting shaft, and the third connecting shaft are arranged parallel to each other in the horizontal and vertical directions, respectively. The pneumatic boom, the first connecting shaft, the second connecting shaft, and the third connecting shaft are respectively hinged to the support frame and the mounting frame, and the rotation axis at the hinge is set in the horizontal direction.

6. The road surface anti-skid testing water film generation device according to claim 1, characterized in that, A limiting part is provided on the support shaft, a limiting groove is provided at the shaft center of the extrusion wheel corresponding to the limiting part, and a speed measuring code disk is sleeved on the support shaft corresponding to the extrusion wheel; The two sides of the extrusion wheel are recessed towards its axis, the limiting part is configured as a spherical structure, the limiting groove is configured as an arc groove, and the wrap angle of the limiting groove is greater than 180°.

7. The road surface skid resistance testing water film generation device according to claim 1, characterized in that, A supporting rib is provided in each of the outer teeth on the tooth surface. The supporting rib includes a plurality of supporting seats arranged along its length direction, and two adjacent supporting seats are hinged together. The support base is configured as a T-shaped structure, including a base plate and a support plate disposed thereon. The end of the support plate away from the base plate is configured as an arc surface, and male connectors and female connectors are respectively provided at both ends of the length of the base plate.

8. A method of using a road surface anti-skid testing water film generation device, characterized in that, The pavement antiskid testing water film generation device according to any one of claims 1 to 7 includes the following steps: Test and inspect the load-bearing vehicle and its lateral force testing device, water film detection device, water film generating device and water spraying device, and start the control system; After passing the pre-running section, the heavy-duty vehicle enters the test section at a constant speed. The water spraying device is turned on in the pre-running section, and the water film generating device is put into working state. The control system collects the detection data of the water film detection device and the lateral force testing device. Calculate the water film thickness based on the detection data from the water film detection device, and determine whether the water spraying device or the water film generating device needs to be adjusted. The vehicle leaves the test section, the lateral force testing device, water film generating device and water spraying device are restored to their initial state, and the control system is stopped to end the test.

9. The method of using the road surface anti-skid testing water film generation device according to claim 8, characterized in that, The water film thickness h is calculated using the following formula: ； in, This indicates the detection data of the laser rangefinder probe set on the corresponding optical surface. and These represent the detection data from the laser ranging probes installed on the two tooth surfaces on either side of the corresponding optical surface. This indicates the thickness of the water film generated in the intermediate wetting zone at the corresponding smooth surface. If the water film thickness does not meet the set value, first adjust the flow rate of the water spraying device, and then adjust the contact pressure between the squeezing wheel and the road surface.

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