In the actual operation process of crane truck, wheel flange and track side will extrude each other, resulting in friction, which is the gnawing phenomenon. During the operation of crane trucks, biting often occurs. The crane mainly uses displacement sensor to measure the deflection of the track. The main control signal is the deflection.
The speed of the driving motors on both sides is mainly adjusted by frequency converter, so that the deflection degree of the frame can be automatically corrected. The horizontal rigidity of the frame can be effectively strengthened and the gnawing phenomenon can be basically eliminated.
Aiming at the automatic deviation correction system, the controller is mainly used to calculate the deviation, and to adjust its dynamics in real time, or to adjust the speed and position of flexible legs. In the course of traveling, the vehicle keeps the deviation of rigid and flexible legs in a certain range. The automatic rectification system mainly includes touch screen, driving device, measuring sensor and master controller. The measurement sensor mainly includes proximity switch, incremental encoder, absolute encoder and so on.
And the automatic controller can also be called programmable logic controller, that is, PLC. In general, the use of PLC can meet various requirements of control performance. If the control performance is relatively high, the main use of a PLC to effectively control the deviation correction system and crane, to choose medium-sized PLC. The main function of touch screen is to display the system status information. At the same time, it can also be the control parameters of the rectification system.
The touch screen mainly uses serial communication and bus line to connect the PLC effectively and store the status information and control parameters in the internal memory of the PLC. The driving device refers to the motor, but in the context of frequency conversion control, it also includes the frequency converter.
The main function of the command controller is to transmit the command automatically. The master controller is a separate master, and it can also combine the linkage platform and the industrial remote controller to give effective commands to the devices that operate the control signals.
By using rubber friction wheels, the rotary encoder can be effectively driven, so that the actual straight line distance of the wheels on the rigid leg side and the flexible leg side can be effectively measured, thus the position deviation between the two legs can be calculated effectively. Rigid leg side and flexible leg side walking motors are mainly driven by two frequency converters. The given current from walking PLC can control the output frequency. The only sensor is mounted on the rigid and flexible legs.
Before the car can be officially operated, its walking reference point needs to be defined so that the rigid legs and flexible legs can be effectively adjusted to be in the best position. In other words, the rigid legs and flexible legs of the car can always be in the walking reference without deflection. In the course of traveling, using displacement sensor of PLC, the electric displacement of rigid leg and flexible leg can be effectively detected, the traveling speed and deviation can be calculated, and the calculation is compared, so that the control signal can be sent out, the output frequency of two sets of frequency converters can be effectively adjusted, so that the rigid leg and flexible leg car can be effectively adjusted.
Effective changes in wheel speed can effectively correct the skewness, so that the skewness can always be maintained in the prescribed value. Simply speaking, it is a boom crane that uses tyre chassis to walk. Tire crane is a special chassis consisting of heavy tyres and wheelshafts, which holds down the aerial crane mechanism. It belongs to a kind of all-rotary crane. The specific high crime and crawler type of the upper part are basically the same. If the stability of the body of the installation operation is to be guaranteed, the crane has four legs, which can not be used on the flat road surface. Outrigger. Mainly consists of two parts, boarding and alighting. The boarding car mainly completes lifting operation, while the alighting car is responsible for walking and supporting function. Slewing support is provided between boarding and disembarking. In the process of the hanging bell, the lower leg should be lowered, the supporting surface should be effectively increased, and the fuselage should be leveled, so that the stability of the crane can be guaranteed. The programmable controller of the self-propelled rectification system of the tyre crane mainly includes laser distance sensor, laser reflector and automatic rectification controller. On one side of the power house, the laser reflector needs to be fixed.
In the process of the tyre crane walking, on both sides of the mechanism bracket and the position of laser reflection, the laser distance sensor needs to be fixed. Acute and effective fixing, each specific laser distance sensor in the signal output end, need ah-ho through the A/D converter, effective connection of automatic deviation correction controller, automatic deviation correction system output terminal, can connect tires to the signal input of programmable controller.
Through the above comprehensive discussion, the crane automatic deviation correction system is effectively discussed. In the process of selecting the scheme, the relevant designers of cranes need to combine the actual situation of field construction, thermostatic element control requirements and cost accounting, so as to select the most suitable scheme, so as to achieve the optimal effect of automatic deviation correction control. We should try our best to avoid rail gnawing and all kinds of safety accidents, promote the better work of cranes in actual construction areas, and avoid more economic losses of enterprises.