CN2572385Y

CN2572385Y - Roller adhersion coefficient test instrument

Info

Publication number: CN2572385Y
Application number: CN 02240336
Authority: CN
Inventors: 周申生; 秦煜麟
Original assignee: Individual
Current assignee: Individual
Priority date: 2002-07-12
Filing date: 2002-07-12
Publication date: 2003-09-10
Anticipated expiration: 2012-07-12

Abstract

The utility model discloses a roller adhesion coefficient test instrument, which is composed of a force measuring sensing device and a display instrument, wherein, the force measuring sensing device comprises a wheel of the test instrument, which is arranged on one end of a frame. The center of the wheel of the test instrument is provided with a brake, the front end is provided with a weight balancing unit. The other end of the frame is vertically fixed with a rubber bearing. The force measuring sensing device is connected with the frame and connected with the brake through a connecting rod unit. A signal output wire of the force measuring sensing device is connected with the signal input end of the display instrument. The air bottle ware with a magnetic component can directly measure the values of attachment coefficients between the surface of a roller of various inspection tables and a tire. The utility model has the advantages of simple test process, high accuracy of test values and high repeatability and solves the technological problem that the roller adhesion coefficient can not be measured accurately for a long time in the detecting industries of native and foreign automobiles and motorcycles.

Description

The roller adhesion coefficient tester

Technical field

The utility model relates to instrument---the roller adhesion coefficient tester that a kind of automobile, motorcycle detect the attachment coefficient of test verification platform cylinder surface and tire in the industry.

Background technology

The roller adhesion coefficient tester is a kind of equipment of test verification platform cylinder surface attachment coefficient.At present, the calibrating of cylinder surface attachment coefficient is undertaken by following rules substantially: according to the specified carrying quality of check-out console, select the satisfactory test car of braking ability, and choose new standard tire, tire pressure is answered conformance with standard; Measure on wheel weighing instrument again that automobile is left and right takes turns (non-deflecting roller) load GL, GR; Again left and right wheel of automobile placed respectively between the cylinder of the left and right both sides of check-out console, add chock block behind the deflecting roller again, start power supply, measure left and right maximum braking FLmax, the FRmax that takes turns; Calculate cylinder surface equivalent attachment coefficient ψ dL, ψ dR by formula again, wherein, ψ dL=FLmax/GL, ψ dR=FRmax/GR, can calculate left and right cylinder surface attachment coefficient ψ L, ψ R, (seeing department of Ministry of Communications measurement verification regulations for details) by cylinder angle of setting α at last.As seen, this kind calibration method is very complicated very, and enchancement factor is too many, does not reach satisfied test effect.

Summary of the invention

The purpose of this utility model is to overcome the shortcoming of above-mentioned prior art, and a kind of roller adhesion coefficient tester is provided, and this tester can directly be measured the attachment coefficient between various automobiles, motorcycle testing usefulness check-out console cylinder surface and automobile, motorcycle tyre.

For achieving the above object, the utility model is taked following design proposal: this roller adhesion coefficient tester, it is made up of force-measuring sensing device and Displaying Meter, described force-measuring sensing device comprises the tester wheel that is contained on frame one end, at the tester wheel center detent is arranged, the outside is furnished with counterweight element, the other end vertical fixing rubber support of frame, one force cell connects frame and is connected with detent by linkage unit, and the output line of force cell is connected with the signal input part of Displaying Meter.

The utility model has the advantages that: can directly determine the surface of various check-out console cylinders and the attachment coefficient value between tire, test process is simple, and the accuracy of test value and repeatability are high.

Description of drawings

Fig. 1 is the utility model structural representation (front view)

Fig. 2 is the utility model structural representation (vertical view)

Fig. 3 is the utility model test verification platform roller adhesion coefficient scheme of installation

Fig. 4 demarcates synoptic diagram for the utility model

Embodiment

The utility model roller adhesion coefficient tester is made up of force-measuring sensing device and Displaying Meter.

As Fig. 1, shown in Figure 2, the utility model force-measuring sensing device comprises: be contained in the tester unit 10 on the rack unit 3, be contained in the detent 7 at tester wheel hub center, the rubber support unit 1 of frames unit 3, the force cell 5 that is connected with frame 3 with detent 7, (the counterweight element device is designed to a kind of hollow to be provided with counterweight element device 8 at the front end of wheel, the container of the threaded opening in outer end, at any time can add or remove the vertical load of counterweight sign indicating number as required) with accurate adjustment tester wheel, the linkage unit 6 that connects brake toggle and force cell, brake unit 7 is connected by tightwire wire 9 with brake handle unit 4, be balanced system power, the tester rear fixed with cable type chain 2.The precision of force cell is very high, reach 0.5%, the one end is bolted on the frame by two, the other end is connected with linkage unit by bearing pin, bearing pin is free to rotate, the linkage unit other end is connected with test wheel brake toggle by bolt, and tester wheel vertical load can accurately be adjusted by counterweight element.

The signal output of force cell is connected with the signal input part of Displaying Meter, and Displaying Meter can adopt the dynamometer (or instrument of similar function) of GF-40 type.

During work, with the test wheel of instrument 12 (the utility model roller adhesion coefficient tester assembly) place tested cylinder (comprise drum reaction type brake platform 11 before, back roll 1101,1102) positive bus-bar top, as shown in Figure 3, the rear end is fixed with the cable type chain, do not allow the wheel reach, start the check-out console motor (as being the passive type cylinder, then available minicar low gear, low speed drives) tested cylinder drive instrument test wheel, after the instrument zero clearing, the brake activation device is slowly braked, damping force F between test wheel and cylinder increases gradually, and pass through brake toggle, linkage unit and force cell are measured F1, (R is the tester radius of wheel to F=F1L/R, L is the detent arm of force), when the test wheel by rolling condition " locking " gradually, when on tested cylinder, changing sliding mode into, damping force descends after reaching maximal value Fmax, attachment coefficient μ=W/Fmax between tested wheel and cylinder, because W (vertical load) accurately demarcated, Fmax is the maximum braking force value (peak value) that instrument measurement is obtained, so instrument can directly demonstrate the attachment coefficient value of cylinder through discharge circuit.

During mensuration, the tester wheel is to place on the positive bus-bar of tested cylinder, has eliminated the influence of wheel angle of setting to cylinder component, make the accuracy of test value and heavily the property covered improve greatly, and have comparability.Test process is that the test wheel is driven by tested cylinder, and (this process of wheel lock up people and the test process of tested automobile on check-out console are identical, therefore, have very strong correlativity progressively to carry out the transition to sliding mode from rolling condition under the damping force effect.Can carry out gauging calibration by simple effective method, confirm the accuracy of its transmission of quantity value.Whether whether measured various materials, the roller adhesion coefficient of surface configuration can allow in order to the cylinder of determining this check-out console to continue to use, need to scrap or upgrade, effective with the measured value of guaranteeing various check-out consoles.

Before dispatching from the factory, roller adhesion coefficient tester and instrument thereof debug through demarcating, concrete calibration process can be referring to Fig. 4, tester is lain in (tester air pressure standard on the worktable 13, the tire outside diameter standard, vertical load is accurately adjusted), press the weight 16 of heavily about 500kg on it, use roller adhesion coefficient detection calibration band 14 (subsidiary short chain) to entangle the tester wheel firm again, the hanging basket 15 of putting counterweight is enclosed within on the hook of calibration tape 14, the weight G of counterweight just is equivalent to the suffered friction force F of tester wheel, vertical load W is known, μ=W/F=W/G then, therefore, when counterweight weight G is known, the tester instrument can directly demonstrate roller adhesion coefficient value μ by its operational amplification circuit, gets 25% of instrument range, 50%, 75%, 100%, 125% and demarcate for six times unloaded the branch.

Measured data proves, the attachment coefficient of the various cylinders of measuring with this instrument has important practical value very near actual user mode.

Claims

1, a kind of roller adhesion coefficient tester, it is made up of force-measuring sensing device and Displaying Meter, it is characterized in that: described force-measuring sensing device comprises the tester wheel that is contained on frame one end, at the tester wheel center detent is arranged, front end is furnished with counterweight element device unit and is connected with detent, and the output line of force cell is connected with the signal input part of Displaying Meter.