Measuring method for crane cart wheel pressure

Abstract

The invention discloses a measuring method for a crane cart wheel pressure. The measuring method for the crane cart wheel pressure includes steps that (1) distributing foils, to be specific, pasting strain foils at the lateral surface of a cart track; (2) building a wheel pressure monitoring system, to be specific, connecting the strain foils and wireless strain nodes with a monitoring host; (3) calibrating, to be specific, enabling a crane to locate in a no-load state, enabling a crane dolly to locate at a proper position, enabling the cart to pass the cart track in a constant speed, and using the wheel pressure monitoring system to record a strain-time curve so as to obtain a wheel pressure and strain calibrating coefficient (shown in the description); (4) measuring the cart wheel pressure on site, to be specific, when the dolly is located at a set position according to a set lifting capacity, gathering the corresponding strain value, and converting the strain value into the corresponding wheel pressure (shown in the description). The measuring method for the crane cart wheel pressure is easy and practical, is capable of precisely measuring the actual value of each wheel pressure, is more direct and reliable than a calculation method, is capable of directly reflecting the wheel pressure non-uniformity of the crane under different working conditions and provides essential data for optimizing, using and maintaining the crane wheels and saving civil engineering cost.

Description

technical field [0001] The invention relates to a measuring method in the field of construction machinery, in particular to a measuring method for the wheel pressure of a crane. Background technique [0002] The pressure of the wheels of the crane running the cart on its track is called the cart wheel pressure. It is an important parameter of the crane, and it is also the main design load and basis of the industrial plant and the cart track foundation. The wheel pressure is calculated by the designer using balance conditions such as the crane’s lifting capacity, self-weight, span, and position of the moving trolley. In order to simplify the calculation, it is considered that the wheel pressure of each wheel on the same track is evenly distributed, and only given The average maximum wheel pressure under the most unfavorable conditions. At present, most cranes adopt a four-point structure. This arrangement has good symmetry and manufacturability, and has high stability. The ...

AI Technical Summary

Problems solved by technology

However, this measurement method has the following problems: (1) determining the maximum support point of the load is determined artificially, which is prone to misjudgment; (2) the amount of lifting one of the supporting legs with a jack is not easy to control, and it cannot be guaranteed that 6 All the wheels are out of contact with the rails, or the distance of disengagement is uniform; (3) The position of the center of gravity of the crane will shift after the wheels are out of contact with the rails, so the pressure detected by the sensor at this time is different from the actual pressure on the supporting legs , the test result is not the most accurate; (4) When calculating the wheel pressure of each wheel, it is considered that the wheel pressure of the six wheels is equal, which is inconsistent with the actual wheel pressure of the crane. In fact, the wheel pressure of each wheel is different; (5) This measurement method can only be carried out when the crane cart is not running, and the wheel pressure of the crane cart changes with the load of the trolley, the rigidity of the structure and the track, and the flatness of the track when the crane cart is running. The wheel pressure can only be used as a design reference, and cannot truly simulate the large wheel pressure of the crane.

However, the wheels of the crane are moving, there are many connections with the surrounding parts, and the space is limited. Each wheel needs a piece of cloth to measure the wheel pressure of each wheel. The more the number of wheels, the more the number of cloth measurement points , the more difficult it is to arrange strain gauges and connect instruments

Therefore, this method is suitable for wheel pressure measurement with fewer wheels to be tested. For cranes with more wheels to be tested, it is limited by the location and quantity of cloth pieces, the connection between strain gauges and instruments, etc., and cannot be used for on-site measurement of crane operation. Wheel pressure of each wheel

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