Lifting mechanism stroke control device, lifting machine and corresponding control method

Abstract

The invention discloses a lifting mechanism stroke control device, which is provided with a first detection switch (6), a second detection switch (7), a coder (12), a timer and a controller (13), wherein the first detection switch (6) is arranged at a starting position and sends a first position signal; the second detection switch (7) is arranged at a stop position and sends a second position signal; the coder (12) sends a counting signal according to the revolution of a driving device; the timer counts operating time and sends a timing signal; the controller (13) receives the signals, and controls the timer to time, the coder to count and the driving device to run at a high speed when receiving the first position signal; the controller compares the timing signal with a preset timing threshold and compares the counting signal with a preset counting threshold in real time; when any one of signal values exceeds the preset threshold, the controller controls the driving device to reduce speed; when not receiving the first position signal, the controller controls the driving device to run at a low speed; and when receiving the second position signal, the controller controls the drivingdevice to stop. The invention also relates to a lifting machine and a method for controlling the control device.

Description

technical field [0001] The invention relates to a stroke control device of a hoisting mechanism and a hoist with the control device. At the same time, the invention also relates to a method for controlling such a stroke control device. Background technique [0002] In the construction machinery industry, lifting devices are used in many places to lift heavy objects to high places. Especially in the production of asphalt concrete, cement concrete and other industries, the production raw materials must be raised to a certain height in order to complete the entire production process through subsequent procedures. [0003] At present, from the perspective of lifting mechanisms used in the construction machinery industry, there are mainly continuous and intermittent lifting mechanisms. The continuous lifting mechanism generally lifts the material to a high place through the cyclic action of the lifting mechanism. The common types of hoisting mechanisms mainly include inclined ...

AI Technical Summary

Problems solved by technology

This stroke control method will be affected by the diameter of the drive wheel of the hoist. When the hoisting cable is wound repeatedly on the drive wheel of the hoist, the winding radius changes, and errors will occur in the stroke calculation of the trolley. In addition, if the signal of the rotary encoder is interfered by the outside, it is easy to Loss and error of the encoding count will directly lead to wrong calculation of the lifting trolley stroke; if the rotary encoder fails, the encoding count will be lost directly, and the control system cannot calculate the exact stroke of the lifting trolley, which will endanger the safety of the lifting trolley

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