Windscreen wiper rubber strip friction force testing machine

Abstract

The invention discloses a windscreen wiper rubber strip friction force testing machine, and relates to the technical field of windscreen wiper rubber strips. The problem that a device in the prior art is inaccurate in testing the friction force of the windscreen wiper rubber strip is solved. Comprising a support, the support is provided with a motor, a speed reducer, a torque sensor, a rotating shaft and a glass cylinder which are assembled, and the motor works to drive the speed reducer to work, drive the torque sensor to work, drive the rotating shaft to rotate and drive the glass cylinder to rotate. The windscreen wiper rubber strip press-fitting adjusting mechanism is provided with a pressure sensor and a windscreen wiper rubber strip clamping piece, and the windscreen wiper rubber strip clamping piece is arranged opposite to the outer side wall of the glass cylinder. The windscreen wiper rubber strip friction force testing machine is used for testing the friction force of a windscreen wiper rubber strip, the friction force is measured through a dynamic torque difference method, inertial interference is eliminated, measured data are accurate, and a windscreen wiper rubber strip friction coefficient curve changing along with the change of the pressure of the windscreen wiper rubber strip pressing on a glass cylinder is generated; and the accuracy of the wiper rubber strip friction force test is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of windshield wiper rubber strips, and in particular to a friction force testing machine for windshield wiper rubber strips. Background Art

[0002] In the existing friction force testing machines for windshield wiper rubber strips, generally, the windshield wiper rubber strip rubs back and forth on a glass disk. There are two forms: one is that the glass disk is fixed and the windshield wiper rubber strip rubs, in which case the measurement of the friction force is easily affected by the movement inertia, resulting in data deviation; the other is that the windshield wiper rubber strip is fixed and the glass disk rotates for friction, in which case the pressure change in actual use cannot be dynamically simulated, and the measurement result is not accurate enough. The friction force of the windshield wiper rubber strip directly measured by these two forms has problems of large error and inaccuracy, which is not conducive to the design and installation of the windshield wiper rubber strip. Summary of the Invention

[0003] The present invention aims to provide a friction force testing machine for windshield wiper rubber strips to eliminate inertial interference and improve the accuracy of the friction force test of the windshield wiper rubber strip.

[0004] To achieve the above object, the technical solution adopted by the present invention is:

[0005] A friction force testing machine for windshield wiper rubber strips disclosed by the present invention includes a bracket, on which a motor, a speed reducer, and a torque sensor are installed. The output shaft of the motor is fixedly connected to the input shaft of the speed reducer, the output shaft of the speed reducer is fixedly connected to the input shaft of the torque sensor, the output shaft of the torque sensor is fixedly connected to a rotating shaft, the rotating shaft is fixedly installed with a glass cylinder, the glass cylinder is coaxial with the rotating shaft, the bracket is installed with a windshield wiper rubber strip pressing and adjusting mechanism, the windshield wiper rubber strip pressing and adjusting mechanism is provided with a pressure sensor and a windshield wiper rubber strip clamping member, the windshield wiper rubber strip clamping member clamps a windshield wiper rubber strip, and the scraping surface of the windshield wiper rubber strip is arranged opposite to the outer side wall of the glass cylinder.

[0006] Further, the diameter of the glass cylinder is 600 mm.

[0007] Further, the rotation speed of the glass cylinder is n, and 3 rpm ≤ n ≤ 180 rpm.

[0008] Further, when the rotation speed of the rear window windshield wiper rubber strip of a car is 30 rpm and the minimum rotation radius of the rear window windshield wiper rubber strip of the car is 100 mm, the rotation speed of the glass cylinder is 5 rpm; when the rotation speed of the front window windshield wiper rubber strip of the car is 70 rpm and the maximum rotation radius of the front window windshield wiper rubber strip of the car is 1200 mm, the rotation speed of the glass cylinder is 140 rpm.

[0009] Further, the windshield wiper rubber strip pressing and adjusting mechanism is located directly above the glass cylinder.

[0010] Further, the wiper rubber strip pressing and adjusting mechanism includes a slide table cylinder, the bracket is provided with a mounting frame, and the slide table cylinder is mounted on the mounting frame.

[0011] Further, the bracket is provided with a hot air blower, and the air outlet of the hot air blower is arranged facing the glass cylinder.

[0012] Further, the mounting frame is provided with an infrared temperature sensor.

[0013] The beneficial effects of the present invention are:

[0014] A wiper rubber strip friction force tester of the present application is used for testing the friction force of the wiper rubber strip. The wiper rubber strip to be tested is clamped and fixed on the wiper rubber strip clamping member, and the scraping surface of the wiper rubber strip faces the outer wall of the glass cylinder. The scraping surface of the wiper rubber strip is not pressed on the outer wall of the glass cylinder. Start the motor to work. The output shaft of the motor rotates to drive the input shaft of the reducer to rotate. The output shaft of the reducer rotates to drive the input shaft of the torque sensor to rotate. The output shaft of the torque sensor rotates to drive the rotating shaft to rotate. The rotating shaft rotates to drive the glass cylinder to rotate. The torque sensor measures the torque M1 of rotating the glass cylinder when the wiper rubber strip is not pressed on the surface wall of the glass cylinder. Stop the motor. By adjusting the wiper rubber strip pressing and adjusting mechanism, the scraping surface of the wiper rubber strip is flexibly pressed on the surface wall of the glass cylinder. Start the motor to work. The torque sensor measures the torque M2 of rotating the glass cylinder when the wiper rubber strip is pressed on the outer wall of the glass cylinder. Calculate the torque difference d(M)=M2 - M1. According to the friction coefficient formula u = d(M) / R / P, the friction coefficient of the wiper rubber strip is obtained, where R is the radius of the glass cylinder, P is the pressure of the wiper rubber strip pressed on the glass cylinder. The radius R of the glass cylinder is pre-selected as a standard size or measured. The pressure P of the wiper rubber strip pressed on the glass cylinder is measured by a pressure sensor. Stop the motor. By adjusting the wiper rubber strip pressing and adjusting mechanism, different pressure values of the wiper rubber strip pressed on the glass cylinder are adjusted. Different friction coefficients (u) of the wiper rubber strip are obtained through the friction coefficient formula. A friction coefficient curve of the wiper rubber strip that changes with the change of the pressure of the wiper rubber strip pressed on the glass cylinder is generated in real time. The calculation accuracy of the friction coefficient is 0.01. By measuring the friction force by the dynamic torque difference method, inertial interference is eliminated, and the measured data is accurate, greatly improving the accuracy of the wiper rubber strip friction force test. The operation conditions of the wiper rubber strip at different rotation speeds and different pressures are simulated, which provides help for the design and installation of the wiper rubber strip. When the glass cylinder with a cylindrical structure rotates, the inertial distribution along the axis is uniform, and the glass cylinder rotates at a constant speed, improving the accuracy of the pressure measured by the pressure sensor when the wiper rubber strip is pressed on the glass cylinder, and further improving the accuracy of the wiper rubber strip friction force test. Description of the Drawings

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0016] Figure 1 is the front view of a wiper rubber strip friction tester provided by an embodiment of the present invention;

[0017] Figure 2 is the right view of a wiper rubber strip friction tester provided by an embodiment of the present invention.

[0018] Reference numerals:

[0019] Bracket 1, motor 2, reducer 3, coupling 4, torque sensor 5, mounting bracket 6, slide cylinder 7, pressure sensor 8, wiper rubber strip clamping member 9, wiper rubber strip 10, glass cylinder 11, rotating shaft 12, infrared temperature sensor 13, hot air blower 14. Detailed implementation manners

[0020] To make the purpose, technical solutions and advantages of the present invention clearer, the following will describe the technical solutions of the present invention in detail. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other implementation manners obtained by those of ordinary skill in the art without creative efforts belong to the scope protected by the present invention.

[0021] The following further illustrates the present invention with reference to the drawings and embodiments.

[0022] Such as Figure 1 、 Figure 2As shown in the figure, this embodiment provides a friction force testing machine for a windshield wiper strip, which includes a bracket 1, on which a motor 2, a speed reducer 3, and a torque sensor 5 are installed. The output shaft of the motor 2 is fixedly connected to the input shaft of the speed reducer 3, the output shaft of the speed reducer 3 is fixedly connected to the input shaft (end) of the torque sensor 5, the output shaft (end) of the torque sensor 5 is fixedly connected to a rotating shaft 12, and a glass cylinder 11 is fixedly installed on the rotating shaft 12. The glass cylinder 11 is coaxial with the rotating shaft 12. A windshield wiper strip pressing and adjusting mechanism is installed on the bracket 1. The windshield wiper strip pressing and adjusting mechanism is provided with a pressure sensor 8 and a windshield wiper strip clamping member 9. The windshield wiper strip clamping member 9 clamps a windshield wiper strip 10, and the scraping surface of the windshield wiper strip 10 is arranged opposite to the outer side wall of the glass cylinder 11. Among them, the motor 2 is powered by an external power supply. Bearing seats are fixedly installed on the front and rear sides of the bracket 1 near the glass cylinder 11 by bolts or welding. Bearings are installed in the bearing seats. The rotating shaft 12 passes through the bearing on the front side, the glass cylinder 11, and the bearing on the rear side. The rotating shaft 12 is in interference fit with the bearing and the glass cylinder 11. The output shaft of the motor 2 is fixedly connected to the input shaft of the speed reducer 3 through a key or a coupling 4. The output shaft of the speed reducer 3 is fixedly connected to the input shaft of the torque sensor 5 through a key or a coupling 4 in an existing solution in the prior art. The output shaft of the torque sensor 5 is fixedly connected to the rotating shaft 12 through a key or a coupling 4. A torque sensor support is installed on the bracket 1. The torque sensor 5 is installed on the torque sensor support. Couplings 4 are installed at the front end and the rear end of the torque sensor 5. The couplings 4 are fixedly installed on the bracket 1 by bolts. The output shaft of the speed reducer 3 is fixedly connected to the coupling 4 at the front end of the torque sensor 5. The output shaft of the torque sensor 5 is fixedly connected to the coupling 4 at the rear end of the torque sensor 5. The rotating shaft 12 is fixedly connected to the coupling 4 at the rear end of the torque sensor 5, effectively transmitting torque, ensuring the accuracy of the measurement of the torque sensor 5, and ensuring the concentricity of the torque sensor 5, the rotating shaft 12, and the glass cylinder 11.

[0023] The wiper strip friction tester based on the above structure is used for testing the friction force of the wiper strip. The wiper strip 10 to be tested is clamped and fixed on the wiper strip clamping member 9, and the scraping surface of the wiper strip 10 faces the outer wall of the glass cylinder 11. The scraping surface of the wiper strip 10 is not pressed on the outer wall of the glass cylinder 11. Start the motor 2 to work. The output shaft of the motor 2 rotates to drive the input shaft of the reducer 3 to rotate. The output shaft of the reducer 3 rotates to drive the input shaft (end) of the torque sensor 5 to rotate. The output shaft (end) of the torque sensor 5 rotates to drive the rotating shaft 12 to rotate. The rotating shaft 12 rotates to drive the glass cylinder 11 to rotate. The torque sensor 5 measures the torque M1 of rotating the glass cylinder 11 when the wiper strip 10 is not pressed on the outer wall of the glass cylinder 11. Stop the motor 2. By adjusting the wiper strip pressing adjustment mechanism, the scraping surface of the wiper strip 10 is flexibly pressed on the surface wall of the glass cylinder 11. Start the motor 2 to work. The torque sensor 5 measures the torque M2 of rotating the glass cylinder 11 when the wiper strip 10 is pressed on the surface wall of the glass cylinder 11. Calculate the difference d(M)=M2 - M1 between the torque of rotating the glass cylinder 11 without the wiper strip 10 pressed and the torque of rotating the glass cylinder 11 with the wiper strip 10 pressed. According to the friction coefficient formula u = d(M) / R / P, the friction coefficient of the wiper strip 10 is obtained, where R is the radius of the glass cylinder 11, and P is the pressure of the wiper strip 10 pressed on the glass cylinder 11. The radius R of the glass cylinder 11 is pre-selected with a standard size or measured. The pressure P of the wiper strip 10 pressed on the glass cylinder 11 is measured by the pressure sensor 8. Stop the motor 2. By adjusting the wiper strip pressing adjustment mechanism, different pressure values of the wiper strip 10 pressed on the glass cylinder 11 are adjusted. Different friction coefficients (u) of the wiper strip 10 are obtained through the friction coefficient formula. A friction coefficient curve of the wiper strip 10 that changes with the change of the pressure of the wiper strip 10 pressed on the glass cylinder 11 is generated in real time. The calculation accuracy of the friction coefficient is 0.01. The friction force is measured by the dynamic torque difference method to eliminate inertial interference, and the measured data is accurate, greatly improving the accuracy of the wiper strip friction force test. The operation conditions of the wiper strip 10 at different rotation speeds and different pressures are simulated, which provides help for the design and installation of the wiper strip 10. When the glass cylinder 11 with a cylindrical structure rotates, the inertial distribution along the axis is uniform, and the glass cylinder 11 rotates at a constant speed, improving the accuracy of the pressure measured by the pressure sensor of the wiper strip 10 pressed on the glass cylinder 11, and further improving the accuracy of the wiper strip friction force test.

[0024] As an implementable mode, as Figure 1 、 Figure 2 shown, the diameter of the glass cylinder 11 is 600 mm.

[0025] The diameter of the glass cylinder 11 is 600 mm, which is used to test windshield wiper rubber strips with a length of 600 mm and below, such as windshield wiper rubber strips with a length of 600 mm, 550 mm, 525 mm, 500 mm, 450 mm, 400 mm, 350 mm, etc., meeting the friction force test requirements for windshield wiper rubber strips of different lengths.

[0026] Among them, the rotation speed of the glass cylinder 11 is n, and 3 rpm ≤ n ≤ 180 rpm.

[0027] The rotation speed of the glass cylinder 11 is between 3 rpm and 180 rpm. For example, the rotation speed of the glass cylinder 11 is 3 rpm, 30 rpm, 70 rpm, 100 rpm, 140 rpm, 180 rpm, etc., which is selected according to different test requirements. The rotation speed of the glass cylinder 11 is adjusted by adjusting the rotation speed of the rotating shaft 12 through the speed reducer 3. A protective shell is arranged outside the torque sensor 5, the coupling 4, and the bearing.

[0028] As an implementable mode, when the rotation speed of the rear windshield wiper rubber strip of the vehicle is 30 rpm and the minimum rotation radius of the rear windshield wiper rubber strip of the vehicle is 100 mm, the rotation speed n of the glass cylinder 11 is (30 / 2 * 100) / (600 / 2) = 5 rpm; when the rotation speed of the front windshield wiper rubber strip of the vehicle is 70 rpm and the maximum rotation radius of the front windshield wiper rubber strip of the vehicle is 1200 mm, the rotation speed n of the glass cylinder 11 is (70 / 2 * 1200) / (600 / 2) = 140 rpm.

[0029] As an implementable mode, as Figure 1 、 Figure 2 shown, the windshield wiper rubber strip pressing and adjusting mechanism is located directly above the glass cylinder 11.

[0030] The windshield wiper rubber strip pressing and adjusting mechanism is arranged directly above the glass cylinder 11. The windshield wiper rubber strip clamping member 9 is located directly above the glass cylinder 11. The windshield wiper rubber strip 10 clamped by the windshield wiper rubber strip clamping member 9 is located directly above the glass cylinder 11, so that the scraping surface of the windshield wiper rubber strip 10 can be better pressed onto the glass cylinder 11.

[0031] As an implementable mode, as Figure 1 、 Figure 2 shown, the windshield wiper rubber strip pressing and adjusting mechanism includes a slide cylinder 7. The bracket 1 is provided with a mounting frame 6, and the slide cylinder 7 is mounted on the mounting frame 6.

[0032] The sliding table cylinder 7 is fixedly installed on the mounting bracket 6 by bolts. The piston rod of the sliding table cylinder 7 is fixedly connected to the wiper rubber strip clamping member 9 by bolts or welding. The sliding table cylinder 7 is externally connected to a gas source, taking compressed air as the power source to push the piston movement inside the cylinder, realizing high-precision linear movement, and pushing the wiper rubber strip clamping member 9 to move, so as to realize the press-fitting of the wiper rubber strip 10. A baffle is fixedly installed on the piston rod of the sliding table cylinder 7 by bolts, and the pressure sensor 8 is installed between the top of the wiper rubber strip clamping member 9 and the baffle. The pressure sensor 8 can also be a contact pressure sensor fixed between the wiper rubber strip clamping member 9 and the wiper rubber strip 10 or on the lip of the wiper rubber strip 10.

[0033] As an implementable embodiment, as Figure 1 、 Figure 2 shown, a hot air blower 14 is installed on the bracket 1, and the air outlet of the hot air blower 14 is arranged facing the glass cylinder 11.

[0034] The hot air blower support can be fixedly installed on the bracket 1 by bolts or welding, and the hot air blower can be fixedly installed on the hot air blower support by bolts. The hot air blower 14 is powered by an external power supply. The hot air blower 14 blows hot air towards the outer wall of the glass cylinder 11 to heat the glass cylinder 11, adjust the temperature to the set value, simulate the friction force change of the wiper rubber strip in different temperature environments, and improve the test reliability.

[0035] As an implementable embodiment, as Figure 1 、 Figure 2 shown, an infrared temperature sensor 13 is installed on the mounting bracket 6.

[0036] An infrared temperature sensor support is fixedly installed on the mounting bracket 6 near the hot air blower 14 by bolts or welding, and the infrared temperature sensor 13 is fixedly installed on the infrared temperature sensor support by bolts. The infrared temperature sensor 13 faces the surface wall of the glass cylinder 11 to quickly, accurately and stably measure the temperature of the glass cylinder 11.

[0037] The above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or substitutions, which should all be covered within the protection scope of the present invention.

Claims

1. A wiper rubber strip friction tester, comprising a bracket (1), characterized in that, A motor (2), a reducer (3), and a torque sensor (5) are installed on the bracket (1). The output shaft of the motor (2) is fixedly connected to the input shaft of the reducer (3). The output shaft of the reducer (3) is fixedly connected to the input shaft of the torque sensor (5). A rotating shaft (12) is fixedly connected to the output shaft of the torque sensor (5). A glass cylinder (11) is fixedly installed on the rotating shaft (12). The glass cylinder (11) is coaxial with the rotating shaft (12). The bracket (1) is equipped with a wiper rubber strip pressing and adjusting mechanism. The wiper rubber strip pressing and adjusting mechanism is provided with a pressure sensor (8) and a wiper rubber strip clamping member (9). The wiper rubber strip clamping member (9) clamps a wiper rubber strip (10). The scraping surface of the wiper rubber strip (10) is arranged opposite to the outer side wall of the glass cylinder (11).

2. The wiper rubber strip friction tester according to claim 1, characterized in that, The diameter of the glass cylinder (11) is 600 mm.

3. The wiper strip friction tester according to claim 1, characterized in that, The rotational speed of the glass cylinder (11) is n, and 3 rpm ≤ n ≤ 180 rpm.

4. The wiper strip friction tester according to claim 3, characterized in that, When the rotational speed of the rear window wiper rubber strip of the vehicle is 30 rpm and the minimum rotation radius of the rear window wiper rubber strip of the vehicle is 100 mm, the rotational speed of the glass cylinder (11) is 5 rpm; when the rotational speed of the front window wiper rubber strip of the vehicle is 70 rpm and the maximum rotation radius of the front window wiper rubber strip of the vehicle is 1200 mm, the rotational speed of the glass cylinder (11) is 140 rpm.

5. A wiper strip friction tester according to claim 1, characterized in that, The wiper rubber strip pressing and adjusting mechanism is located directly above the glass cylinder (11).

6. The wiper strip friction tester according to claim 5, characterized in that, The wiper rubber strip pressing and adjusting mechanism includes a slide table cylinder (7). The bracket (1) is equipped with a mounting frame (6). The slide table cylinder (7) is installed on the mounting frame (6).

7. The wiper strip friction tester according to claim 6, characterized in that, The bracket (1) is equipped with a hot air blower (14). The air outlet of the hot air blower (14) is arranged facing the glass cylinder (11).

8. The wiper rubber strip friction tester according to claim 7, characterized in that, The mounting frame (6) is equipped with an infrared temperature sensor (13).

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