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Crawler chassis design points to share

There are many factors that affect the crawler chassis of engineering drilling rigs. If the consideration is not reasonable, the design is not reasonable, there will be difficult to walk, steering difficulties, poor acceleration performance and other issues, affecting the performance of the crawler chassis generally have the following points.

1. Running resistance of the ground to the track

The running resistance of the ground to the track refers to the running resistance caused by the deformation of the ground, and its size is related to the specific pressure of the track to the ground and the position of the center of mass of the track. Vehicle and ground conditions. Since the crawler chassis is generally constructed on relatively harsh ground, when selecting the specific resistance coefficient of the operation, the various operating environments should be fully considered and the appropriate resistance coefficient should be selected.

2. Internal resistance

The internal resistance mainly refers to the walking resistance caused by the friction inside the walking mechanism. The general crawler chassis is composed of a drive mechanism, a crawler, rollers, guide wheels, support sprockets or drag chain plates, etc. When walking, the friction between these mechanisms will inevitably produce a certain internal resistance, which is generally composed of five parts Composition: 1) When the track plate bypasses the guide wheel and the driving wheel, there is relative friction resistance when rotating. 2) Friction resistance at the roller. The resistance is related to the outer diameter of the roller, the diameter of the roller, the weight transmitted from the roller to the track shoe, and the friction coefficient between the roller shafts. 3) Friction resistance at the guide wheel. 5) Friction resistance at the support sprocket or support sprocket plate. It is related to the weight, contact area and friction coefficient of the track plate supported by the carrying sprocket or chain plate. The internal resistance generally accounts for about 16% of the walking resistance, and should be fully considered in the design.

3. Slope resistance

Slope resistance refers to the running resistance caused by the weight component of the vehicle when climbing a hill. The general construction site terrain is uneven, which requires the crawler chassis has a certain climbing ability. The slope resistance formula is F = mgsina. It can be seen that it is determined by the car's gradeability and self-weight, and is proportional to both. This kind of resistance generally accounts for about 60% of the total driving resistance and is the main factor affecting the driving performance of the crawler chassis.

4. Turning resistance

Turning resistance mainly has the following two situations: 1) Turning resistance in situ. In-situ turning resistance refers to the resistance generated when the crawlers on both sides turn in reverse at the same time. The resistance is mainly related to the proportional coefficient of vertical load and friction resistance, the grounding length and track gauge of the track. 2) Steering resistance of one-sided track. One-sided track steering resistance refers to the resistance generated when one side of the track brakes and the other side turns unilaterally. The resistance is mainly related to flow resistance coefficient, steering resistance coefficient, track grounding length and track gauge. In addition, the magnitude of these two resistances is also related to the center of mass of the vehicle. If the mechanical center of mass falls in the center of the crawler frame (I. e. the crawler ground pressure is evenly distributed), the steering resistance at this time is greater than the uneven distribution of the steering resistance when the crawler ground pressure is uneven. It is small, so when turning, try to make the center of mass of the whole vehicle fall in the center of the track frame.

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