Potentiometer, engine hand throttle control system and crane

Abstract

The invention relates to the technical field of operation control and discloses a potentiometer, an engine hand throttle control system and a crane. The potentiometer is used for achieving all-around uninterrupted speed regulation, operating efficiency of an operator is improved, and service life of the potentiometer is prolonged. The potentiometer comprises an even number of resistor bodies which are sequentially arrayed in an annular shape and electric brushes. The head ends of the resistor bodies in odd number sequential positions and the tail ends of the resistor bodies in even number sequential positions are respectively connected with a positive electrode of a power source. The tail ends of the resistor bodies in the odd number sequential positions and the head ends of the resistor bodies in the even number sequential positions are respectively connected with a negative electrode of the power source. The electric brushes can slide on the surfaces of all the resistor bodies and output current potential signals. Compared with the prior art, the electric brushes can achieve 360-degree all-around rotation, engine speed of engineering machinery is controlled through the potentiometer to achieve the all-around uninterrupted speed regulation, operation is very convenient, the operating efficiency of the operator is greatly improved, and besides service life of the potentiometer is prolonged.

Description

technical field [0001] The invention relates to the technical field of operation control, in particular to a potentiometer, an engine hand throttle control system and a crane. Background technique [0002] In the prior art, in order to reduce the operator's fatigue, more and more cranes control the engine speed by switching between the foot accelerator and the hand accelerator. For example, the operator controls the engine speed through the foot accelerator when the crane is running , When the crane is performing lifting operations, the operator controls the engine speed through the hand throttle. The structures of foot accelerator pedal 10 and hand accelerator potentiometer 20 are respectively as Figure 1a and Figure 1b shown. [0003] The output signal of the hand throttle potentiometer 10 has a linear relationship with the engine speed, as Figure 1b As shown, when the knob is turned to the scale "0", the hand throttle opening is minimum, corresponding to the minimum...

AI Technical Summary

Problems solved by technology

[0004] The defect in the prior art is that the knob of the hand throttle potentiometer 10 has a certain rotation dead zone when it is rotated, and cannot realize 360-degree omnidirectional rotation, that is, when the knob is turned to the scale "0", if the engine speed needs to be increased , you can only turn the knob clockwise but not counterclockwise. When the knob is turned to the scale "10", if you need to reduce the engine speed, you can only turn the knob counterclockwise and not clockwise

It can be seen that the existing hand throttle potentiometer cannot realize all-round uninterrupted speed regulation, and the adjustment operation is inconvenient, which is not conducive to improving the operating efficiency of the operator, and the hand throttle potentiometer is easily damaged due to improper operation of the operator

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