Integrated screw loading roller adhesion coefficient tester

Abstract

The integrated screw-loaded roller adhesion coefficient tester comprises: a test wheel, a wheel frame, a positive pressure sensor, a braking force sensor, a disc brake, a pressure mechanism, and a frame; the test wheel is installed in the wheel frame; the pressure mechanism comprises: a screw rotating disk and a screw; the screw rotating disk is installed on the top of the screw; the positive pressure sensor is installed above the wheel frame at the top of the test wheel, and the bottom of the screw presses the positive pressure sensor; one end of the braking force sensor is connected to the wheel frame, and the other end is connected to the disc brake; one end of the disc brake is installed on the axle of the test wheel and can rotate around the axle, and the other end is connected to the braking force sensor. When braking, the braking force of the disc brake is fed back through the braking force sensor; two hook mechanisms are respectively arranged on both sides of the frame, and the frame is fixed to the inspection table through the four hook mechanisms. The present invention integrates the test wheel and the frame into an integrated screw-loaded roller adhesion coefficient tester, which has a moderate size and weight and is convenient to carry.

Description

[Technical field]

[0001] The invention belongs to testing equipment of a roller reaction force type automobile brake test bench, in particular to an integrated screw loading roller adhesion coefficient tester. [Background technology]

[0002] Braking performance is one of the important indicators of automobile safety performance, which directly affects the performance of automobile speed performance and is closely related to people's traffic safety. The roller reaction brake test bench is used to test the braking performance of automobile test lines, and the size of the roller adhesion coefficient is crucial to the calculation of the vehicle braking rate. The 5.1 technical parameter section of GB / T13564-2005 stipulates that the roller adhesion coefficient used in the roller reaction automobile brake test bench cannot be less than 0.7. Therefore, accurate measurement of the adhesion coefficient of the roller reaction brake test bench is crucial to ensure everyone's driving safety.

[0003] JG906-2015 stipulates the verification items and verification methods of the roller reaction brake test bench, among which the standard device measurement method and the simulation measurement method can be used for the verification of the sliding adhesion coefficient. When there is doubt, the standard device measurement method is used for arbitration. The standard device measurement method needs to be carried out using an adhesion coefficient tester. However, the traditional adhesion coefficient tester (for example, the roller adhesion coefficient tester structure disclosed in the Chinese utility model patent ZL02240336.1 is a weight loading counterweight module) is too bulky due to the presence of the counterweight unit and the weight of the instrument itself. The entire system structure is complex and inconvenient to install and debug. In addition, the adhesion coefficient tester of Hebei AVIC Testing Technology Service Co., Ltd. is composed of a frame, wheels, handbrakes, counterweights, displays, etc., relying on the weight of the instrument and the counterweight as positive pressure, and using a hook to ensure the stability of the instrument. The entire tester is large and bulky. During the test, the hook needs to find a hook point to fix it, which is not convenient to carry and test on site. The calibration of automobile lines requires the calibration personnel to go to the factory for calibration. In order to facilitate the calibration personnel to carry and operate, and to improve the efficiency of the calibration, it is very necessary to develop a new type of roller adhesion coefficient tester.

[0004] The 5th issue of "Measurement Technology" in 2013 disclosed a new type of roller adhesion coefficient tester, which uses a screw pressurization method to replace the traditional counterweight. While reducing the weight of the entire system and simplifying the system structure, the size of the positive pressure can also be adjusted according to different environments. However, the document only designed a test wheel (please refer to the document Figure 2), when in use, the test bench is required to design and process the external mounting frame according to its own test bench and test wheel size, which is a design that separates the test wheel and the external frame. In fact, when using this tester, a mounting frame is processed, but this mounting frame can only fit one test bench and can only measure at one position of the test bench, and its versatility is very poor. [Summary of the invention]

[0005] The technical problem to be solved by the present invention is to provide an integrated screw-loaded roller adhesion coefficient tester with universality.

[0006] The present invention is achieved in that:

[0007] An integrated screw-loaded roller adhesion coefficient tester includes: a test wheel, a wheel frame, a positive pressure sensor, a braking force sensor, a disc brake, a pressurizing mechanism, and a frame;

[0008] The test wheel is mounted in the wheel frame;

[0009] The pressurizing mechanism comprises: a screw rotating disk and a screw; the screw rotating disk is installed on the top of the screw; the positive pressure sensor is installed above the wheel frame at the top of the test wheel, and the bottom end of the screw presses the positive pressure sensor;

[0010] One end of the braking force sensor is connected to the wheel frame, and the other end is connected to the disc brake; one end of the disc brake is installed on the axle of the test wheel and can rotate around the axle, and the other end is connected to the braking force sensor. When braking, the braking force of the disc brake is fed back through the braking force sensor;

[0011] The frame is in the form of a frame, the screw rotating disk is located above the frame, the test wheel, the positive pressure sensor, and the braking force sensor are located inside the frame of the frame; the screw passes through a nut mounted on a fixed plate and matched with the screw from the top of the frame to reach the inside of the frame of the frame; four vertical cylindrical chrome-plated polished rods are provided on the side of the frame, each of which is covered with two square linear bearings, and the square linear bearings are installed on the side of the test wheel frame, one on the top and one on the bottom, so as to ensure that the test wheel can slide freely up and down;

[0012] Two hook mechanisms are respectively arranged on both sides of the frame, and the frame is fixed to the inspection table through the four hook mechanisms.

[0013] Furthermore, the hook mechanism includes: a long strip plate with a long hole in the middle and an L-shaped clamp; one end of the L-shaped clamp passes through the long hole on the long strip plate and is fixed by a nut, and the other end is located below the long strip plate and parallel to the long strip plate.

[0014] Furthermore, it also includes an instrument box, which is arranged on the frame; the positive pressure sensor and the braking force sensor are respectively connected to the instrument box.

[0015] The advantages of the present invention are:

[0016] 1. The test wheel and the frame are integrated into one, designed as an integrated screw loading roller adhesion coefficient tester, with moderate size and weight, easy to carry.

[0017] 2. Four hook mechanisms hook the lower edge of the steel plate at the edge of the test bench, so that the tester can be firmly placed on the test bench, making installation easy.

Brief Description of the Drawings

[0018] The present invention will be further described below in conjunction with embodiments with reference to the accompanying drawings.

[0019] Figure 1 It is a three-dimensional structural schematic diagram of the present invention.

[0020] Figure 2 yes Figure 1 main view.

[0021] Figure 3 yes Figure 1 Top view of the .

[0022] Figure 4 yes Figure 1 Right view of .

[0023] Figure 5 It is a schematic diagram of the partial structure inside the frame of the present invention. [Specific implementation method]

[0024] See also Figures 1 to 5 The integrated screw loading roller adhesion coefficient tester comprises: a test wheel 1, a wheel frame 2, a positive pressure sensor 3, a braking force sensor 4, a disc brake 5, a pressurizing mechanism 6, and a frame 7.

[0025] The test wheel 1 is installed in the wheel frame 2; the wheel frame 2 is a bridge structure, and the test wheel 1 is connected to the wheel frame 2 via a wheel axle 11.

[0026] The pressurizing mechanism 6 includes: a screw rotating disk 61 and a screw 62; the screw rotating disk 61 is installed on the top of the screw 62, the positive pressure sensor 3 is installed above the wheel frame 2 at the top of the test wheel 1, and the bottom end of the screw 62 presses the positive pressure sensor 3.

[0027] One end of the braking force sensor 4 is connected to the wheel frame 2, and the other end is connected to the disc brake 5; one end of the disc brake 5 is installed on the axle 11 of the test wheel 1 and can rotate around the axle 11, and the other end is connected to the braking force sensor 4. When braking, the braking force of the disc brake 5 is fed back through the braking force sensor 4.

[0028] The frame 7 is frame-shaped, the screw rotating disk 61 is located above the frame, the test wheel 1, the positive pressure sensor 3, and the braking force sensor 4 are located inside the frame of the frame 1; the screw 62 passes through a nut 63 mounted on a fixing plate 71 and matched with the screw 62 from the top of the frame 7 to reach the inside of the frame of the frame 7; four vertical cylindrical chrome-plated rods 72 are provided on the side of the frame 1, each of the rods 72 is covered with two square linear bearings 73, and the square linear bearings 73 are installed on the side of the wheel frame 2 of the test wheel 1, one on the top and one on the bottom, so as to ensure that the test wheel 1 can slide freely up and down.

[0029] Two hook mechanisms 74 are respectively provided on both sides of the frame 7 , and the frame 7 is fixed to the inspection table via the four hook mechanisms 74 .

[0030] Each hook mechanism 74 includes: a long strip plate 741 with a long hole in the middle, and an L-shaped clamp 742; one end of the L-shaped clamp 742 passes through the long hole on the long strip plate 741 and is fixed by a nut 743, and the other end is located below the long strip plate 741 and parallel to the long strip plate 741.

[0031] It also includes an instrument box 8, which is arranged on the frame 7; the positive pressure sensor 3 and the braking force sensor 4 are respectively connected to the instrument box 8.

[0032] When working, first place the tester on the roller reaction type automobile brake test bench, adjust the instrument so that the test wheel 1 is placed vertically on the upper busbar of the roller to be tested, and the rotation axis of the test wheel 1 is parallel to the busbar of the roller to be tested, and lock the hook mechanism 74 to stabilize the tester on the test bench. Rotate the screw rotating disk 61 to make the test wheel 1 move downward and press the roller, read the positive pressure from the positive pressure sensor 3, and the positive pressure is usually required to be not less than 400N. After the positive pressure is stable, start the drive motor of the roller to be tested to rotate the roller, and slowly brake the test wheel 1 after the roller speed is stable. After the disc brake 5 locks the test wheel 1, the contact surface between the test wheel 1 and the roller to be tested should be in a sliding state. At this time, read the adhesion coefficient value displayed by the tester in the instrument box 8.

[0033] The test wheel 1 and the frame 7 of the present invention are integrated into one body, and are designed as an integrated screw-loaded roller adhesion coefficient tester, which has a moderate size and weight and is convenient to carry. The four hook mechanisms 74 hook the lower edge of the steel plate at the edge of the test table, so that the tester can be firmly placed on the test table, and is easy to install.

[0034] The above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention. Any modification, equivalent replacement and improvement made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. Integrated screw loading roller adhesion coefficient tester, characterized by: include: Test wheels, wheel frames, positive pressure sensors, braking force sensors, disc brakes, pressurizing mechanisms, and racks; The test wheel is mounted in the wheel frame; The pressurizing mechanism comprises: a screw rotating disk and a screw; the screw rotating disk is installed on the top of the screw; the positive pressure sensor is installed above the wheel frame at the top of the test wheel, and the bottom end of the screw presses the positive pressure sensor; One end of the braking force sensor is connected to the wheel frame, and the other end is connected to the disc brake; one end of the disc brake is installed on the axle of the test wheel and can rotate around the axle, and the other end is connected to the braking force sensor. When braking, the braking force of the disc brake is fed back through the braking force sensor; The frame is in the form of a frame, the screw rotating disk is located above the frame, the test wheel, the positive pressure sensor, and the braking force sensor are located inside the frame of the frame; the screw passes through a nut mounted on a fixed plate and matched with the screw from the top of the frame to reach the inside of the frame of the frame; four vertical cylindrical chrome-plated polished rods are provided on the side of the frame, each of which is covered with two square linear bearings, and the square linear bearings are installed on the side of the test wheel frame, one on the top and one on the bottom, so as to ensure that the test wheel can slide freely up and down; Two hook mechanisms are respectively arranged on both sides of the frame, and the frame is fixed to the inspection table through the four hook mechanisms.

2. The integrated screw-loaded roller adhesion coefficient tester according to claim 1, characterized in that: Each of the hook mechanisms comprises: a long strip plate with a long hole in the middle and an L-shaped clamp; one end of the L-shaped clamp passes through the long hole on the long strip plate and is fixed by a nut, and the other end is located below the long strip plate and parallel to the long strip plate.

3. The integrated screw-loaded roller adhesion coefficient tester according to claim 1, characterized in that: It also includes an instrument box, which is arranged on the frame; the positive pressure sensor and the braking force sensor are respectively connected to the instrument box.

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