Brake assebly for bulldozer spare parts
Brake Assebly
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description
If the braking performance is found to be degraded, the braking must be timely The system is adjusted or repaired to improve braking performance. But how to test the braking performance of bulldozers simply and quickly has always been a relatively difficult task. At present, the commonly used inspection methods include visual inspection, test drive and special instrument inspection. The first two methods are simple to operate, but have large errors. They can only roughly estimate the braking performance of the bulldozer, cannot obtain specific data, and lack a unified evaluation standard; the latter is expensive and complicated to operate, and it is not suitable for mobile measurement. In fact, the braking performance of the bulldozer mainly depends on the braking torque, so the braking torque can be used as a standard to measure the performance of the braking system. This paper proposes a method for measuring braking torque and corresponding measuring instrument controlled by a single-chip microcomputer. This instrument can accurately measure the dynamic torque of the bulldozing mechanism, and is small in size and can be moved for measurement. It can be used for the supervision and maintenance department of the agricultural machinery supervision department. Provide scientific basis for the maintenance of the equipment.
1. Measuring principle
The measuring device consists of a jack, a base, a steel wire rope, a tension sensor and a measuring instrument. The jack is fixed on the base and is used to lift the wheels. The function of the wire rope is to apply a moment to the wheel on the outer edge of the wheel. One end of the wire rope is tied to the wheel through a hole in the hub, and the other end is connected to the tension sensor along the wheel, and the tension sensor is connected to the base. The tensile force sensor converts the strain signal of the tensile force into an electrical signal, which is transmitted to the measuring instrument through the shielded wire, and the measuring instrument performs signal amplification, analog-to-digital conversion and data display.
When measuring, first push the jack up to make the wheel slightly off the ground. At this time, the wheel should be able to rotate freely. If it does not rotate, it indicates that the gap between the brake shoe and the brake drum is too small and needs to be adjusted or repaired. Turn the wheel to make the wire rope taut, then step on the brake and continue to lift the jack, the wire rope is gradually tightened. When the torque generated by the rope pulling force exceeds the braking torque of the brake, the wheels start to slip. At this time, the maximum braking torque M of the brake is equal to the torque produced by the rope pulling force, namely:
M=F.r
F-the pulling force of the wire rope
r-bulldozer wheel radius
The pulling force of the steel wire rope is converted into an electric signal by the pulling force sensor, which is processed, recorded and displayed by the measuring instrument as required. For a certain type of bulldozer, the radius of the wheel is usually constant, so the rope pulling force can also be used to directly measure the braking performance of this type of bulldozer.
2. The hardware design of the measuring instrument
The hardware of the measuring instrument is composed of signal amplification module, A/D analog-to-digital conversion module and CPU processing module. The measuring instrument realizes the amplification processing of the weak signal and converts it into a digital quantity, calculates the braking torque and displays the measurement result.
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