阅读说明：本技术 一种纵向力摩擦系数测试仪的水膜厚度控制系统及方法 (Water film thickness control system and method of longitudinal force friction coefficient tester ) 是由 沈沂 韩笑飞 郝亮 于 2021-06-27 设计创作，主要内容包括：本发明公开了一种纵向力摩擦系数测试仪的水膜厚度控制系统,包括机架,机架上安装有喷水管和辊筒,辊筒位于喷水管背向机架前进方向的一侧,辊筒的一端安装有驱动电机,辊筒的另一端连接有压缩空气管,辊筒表面均匀设置有若干个喷气孔,喷气孔通过辊筒内部的输气管与压缩空气管连接,机架上安装有两个水膜厚度测量仪,两个水膜厚度测量仪分别位于辊筒的两侧。本发明能够改进现有技术的不足,提高对于水膜厚度的控制精度。(The invention discloses a water film thickness control system of a longitudinal force friction coefficient tester, which comprises a rack, wherein a spray pipe and a roller are arranged on the rack, the roller is positioned on one side of the spray pipe, which is back to the advancing direction of the rack, one end of the roller is provided with a driving motor, the other end of the roller is connected with a compressed air pipe, the surface of the roller is uniformly provided with a plurality of air injection holes, the air injection holes are connected with the compressed air pipe through an air pipe inside the roller, the rack is provided with two water film thickness testers, and the two water film thickness testers are respectively positioned on two sides of. The invention can improve the defects of the prior art and improve the control precision of the water film thickness.)

1. The utility model provides a water film thickness control system of longitudinal force coefficient of friction tester which characterized in that: including frame (1), install spray pipe (2) and roller (3) on frame (1), roller (3) are located spray pipe (2) one side of frame (1) direction of advance dorsad, driving motor (4) are installed to the one end of roller (3), the other end of roller (3) is connected with compressed air pipe (5), roller (3) surface evenly is provided with a plurality of fumarole (6), fumarole (6) are connected with compressed air pipe (5) through inside gas-supply pipe (7) of roller (3), install two water film thickness measurement appearance (8) on frame (1), two water film thickness measurement appearance (8) are located the both sides of roller (3) respectively.

2. The water film thickness control system of longitudinal force friction coefficient tester of claim 1, characterized in that: the outlet of the water spray pipe (2) faces the advancing direction of the rack (1), and the included angle between the water outlet direction of the water spray pipe (2) and the road surface is 25 degrees.

3. The water film thickness control system of longitudinal force friction coefficient tester of claim 2, characterized in that: the water spraying device is characterized in that a strip-shaped water outlet (9) is installed at the outlet of the water spraying pipe (2), and a plurality of step parts (10) with gradually reduced intervals are arranged in the strip-shaped water outlet (9).

4. The water film thickness control system of longitudinal force friction coefficient tester of claim 1, characterized in that: the gas orifice (6) is conical, and an upper concave part (11) is arranged on the outer side edge of the gas orifice (6).

5. A control method of a water film thickness control system of a longitudinal force friction coefficient tester according to any one of claims 1 to 4, characterized by comprising the steps of:

A. the machine frame (1) moves on a road surface under the traction of traction equipment, the water spraying pipe (2) sprays water to the road surface, the water spraying flow rate is preset according to the moving speed of the machine frame (1), and the roller (3) rolls the water sprayed road surface area;

B. the two water film thickness measuring instruments (8) measure the water film thickness in front of and behind the roller (3);

C. if the thickness of the water film in front of the roller (3) exceeds a first preset range, adjusting the water spraying flow; if the thickness of the water film behind the roller (3) exceeds a second preset range, adjusting the rotating speed of the roller (3); if the water film thickness in front of the roller (3) and/or the water film thickness fluctuation range behind the roller exceeds a third preset range, the gas flow of the compressed air pipe (5) is adjusted.

6. The method for controlling the water film thickness control system of the longitudinal force friction coefficient tester according to claim 5, wherein: in the step C, when the thickness of the water film in front of the roller (3) is larger than the upper limit of a first preset range, reducing the water spraying flow; when the thickness of the water film in front of the roller (3) is smaller than the lower limit of a first preset range, the water spraying flow is increased; when the thickness of the water film behind the roller (3) is larger than the upper limit of a second preset range, increasing the difference between the rotating linear speed of the roller (3) and the moving speed of the rack (1); when the thickness of the water film behind the roller (3) is smaller than the lower limit of the second preset range, the difference between the rotating linear speed of the roller (3) and the moving speed of the rack (1) is reduced.

Technical Field

The invention relates to the technical field of longitudinal force friction coefficient measurement, in particular to a water film thickness control system and method of a longitudinal force friction coefficient tester.

Background

When a longitudinal force friction coefficient test is carried out, in order to reduce the loss of the tire, a layer of water film is sprayed on the road surface during the test, and the thickness of the water film needs to be controlled for the accuracy of the test. In the prior art, the thickness of a water film is simply controlled by controlling the water spraying flow, and the control precision is low.

Disclosure of Invention

The invention aims to provide a water film thickness control system and method of a longitudinal force friction coefficient tester, which can overcome the defects of the prior art and improve the control precision of the water film thickness.

In order to solve the technical problems, the technical scheme adopted by the invention is as follows.

The utility model provides a water film thickness control system of vertical power coefficient of friction tester, which comprises a frame, install spray pipe and roller in the frame, the roller is located one side of spray pipe dorsad frame direction of advance, driving motor is installed to the one end of roller, the other end of roller is connected with compressed air pipe, the roller surface evenly is provided with a plurality of fumarole, the fumarole passes through the inside gas-supply pipe of roller and is connected with compressed air pipe, install two water film thickness measurement appearance in the frame, two water film thickness measurement appearance are located the both sides of roller respectively.

Preferably, the outlet of the water spray pipe faces the advancing direction of the rack, and the included angle between the water outlet direction of the water spray pipe and the road surface is 25 degrees.

Preferably, the outlet of the water spray pipe is provided with a strip-shaped water outlet, and a plurality of step parts with gradually reduced intervals are arranged in the strip-shaped water outlet.

Preferably, the gas injection hole is conical, and an upper concave part is arranged on the outer edge of the gas injection hole.

A control method of the water film thickness control system of the longitudinal force friction coefficient tester comprises the following steps:

A. the machine frame moves on the road surface under the traction of the traction equipment, the water spraying pipe sprays water to the road surface, the water spraying flow is preset according to the moving speed of the machine frame, and the roller rolls the water sprayed road surface area;

B. the two water film thickness measuring instruments measure the water film thickness behind the roller;

C. if the thickness of the water film in front of the roller exceeds a first preset range, adjusting the water spraying flow; if the thickness of the water film behind the roller exceeds a second preset range, adjusting the rotating speed of the roller; and if the water film thickness in front of the roller and/or the water film thickness fluctuation range in back of the roller exceeds a third preset range, adjusting the gas flow of the compressed air pipe.

Preferably, in the step C, when the thickness of the water film in front of the roller is larger than the upper limit of the first preset range, the water spraying flow is reduced; when the thickness of the water film in front of the roller is smaller than the lower limit of the first preset range, the water spraying flow is increased; when the thickness of the water film behind the roller is larger than the upper limit of a second preset range, increasing the difference between the rotating linear speed of the roller and the moving speed of the rack; when the thickness of the water film behind the roller is smaller than the lower limit of the second preset range, the difference between the rotating linear speed of the roller and the moving speed of the rack is reduced.

Adopt the beneficial effect that above-mentioned technical scheme brought to lie in: according to the invention, after water is sprayed, the water film is homogenized for the second time through the roller, so that not only can the thickness of the water film be accurately controlled, but also the uniformity of the water film can be adjusted. The thickness of the water film is accurately controlled by monitoring the thickness of the water film in front of and behind the roller in real time. The water spraying structure provided by the invention can improve the uniformity of water flow distributed on a road surface after being sprayed. The structure of the air injection holes can improve the flow distribution uniformity of the air flow on the surface of the roller.

Drawings

FIG. 1 is a block diagram of one embodiment of the present invention.

Fig. 2 is a structural view of a strip water outlet according to an embodiment of the present invention.

FIG. 3 is a block diagram of a roll in one embodiment of the invention.

In the figure: 1. a frame; 2. a water spray pipe; 3. a roller; 4. a drive motor; 5. a compressed air pipe; 6. a gas injection hole; 7. a gas delivery pipe; 8. a water film thickness measuring instrument; 9. a strip-shaped water outlet; 10. a step portion; 11. and an upper recess.

Detailed Description

The standard parts used in the invention can be purchased from the market, the special-shaped parts can be customized according to the description and the description of the attached drawings, and the specific connection mode of each part adopts the conventional means of mature bolts, rivets, welding, sticking and the like in the prior art, and the detailed description is not repeated.

Referring to fig. 1-3, one embodiment of the invention comprises a frame 1, a spray pipe 2 and a roller 3 are installed on the frame 1, the roller 3 is located on one side of the spray pipe 2, which is back to the advancing direction of the frame 1, a driving motor 4 is installed at one end of the roller 3, a compressed air pipe 5 is connected to the other end of the roller 3, a plurality of air injection holes 6 are uniformly arranged on the surface of the roller 3, the air injection holes 6 are connected with the compressed air pipe 5 through an air pipe 7 inside the roller 3, two water film thickness measuring instruments 8 are installed on the frame 1, and the two water film thickness measuring instruments 8 are respectively located on two sides of the roller 3. The outlet of the spray pipe 2 faces the advancing direction of the frame 1, and the included angle between the water outlet direction of the spray pipe 2 and the road surface is 25 degrees. The outlet of the spray pipe 2 is provided with a strip-shaped water outlet 9, and a plurality of step parts 10 with gradually reduced intervals are arranged in the strip-shaped water outlet 9. The gas injection hole 6 is conical, and the outer edge of the gas injection hole 6 is provided with an upper concave part 11.

A control method of the water film thickness control system of the longitudinal force friction coefficient tester comprises the following steps:

A. the machine frame 1 moves on the road surface under the traction of traction equipment, the water spraying pipe 2 sprays water to the road surface, the water spraying flow rate is preset according to the moving speed of the machine frame 1, and the roller 3 rolls the water sprayed road surface area;

B. the two water film thickness measuring instruments 8 measure the water film thickness in front of and behind the roller 3;

C. if the thickness of the water film in front of the roller 3 exceeds a first preset range, adjusting the water spraying flow; if the thickness of the water film behind the roller 3 exceeds a second preset range, adjusting the rotating speed of the roller 3; and if the water film thickness in front of the roller 3 and/or the water film thickness fluctuation range behind the roller exceeds a third preset range, adjusting the gas flow of the compressed air pipe 5.

In the step C, when the thickness of the water film in front of the roller 3 is larger than the upper limit of the first preset range, reducing the water spraying flow; when the thickness of the water film in front of the roller 3 is smaller than the lower limit of the first preset range, the water spraying flow is increased; when the thickness of the water film behind the roller 3 is larger than the upper limit of a second preset range, increasing the difference between the rotating linear speed of the roller 3 and the moving speed of the rack 1; when the thickness of the water film behind the roller 3 is smaller than the lower limit of the second preset range, the difference between the rotating linear speed of the roller 3 and the moving speed of the rack 1 is reduced.

In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, are merely for convenience of description of the present invention, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.

The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.