Single-handle electrical control system of transporter grab crane

Abstract

The invention discloses a single-handle electrical control system of a transporter grab crane. The single-handle electrical control system comprises an electrical transmission mechanism I and an electrical transmission mechanism II, which cooperatively work to acquire opening, closing and lifting state information of a crane grab to control the grab work, and further comprises a PLC (Programmable Logic Controller) controller in data communication with the electrical transmission mechanism I and the electrical transmission mechanism II, wherein the PLC controller calculates and outputs a rope difference between the two transmission mechanisms according to the operation distances of the electrical transmission mechanism I and the electrical transmission mechanism II, and then compares the rope difference with a limiting reference value to determine the actual opening position of the grab, so as to control the grab work. The system adopts the independent electrical transmission mechanism I and electrical transmission mechanism II to monitor the crane grab state in the working process in real time, calculates the rope difference value between the two transmission mechanisms, and compares the rope different value with the limiting reference value to determine the opening position of the grab, so as to control the grab work.

Description

technical field [0001] The invention relates to an electric control system of a crane, in particular to a single-handle electric control system of a bridge grab crane. Background technique [0002] There are roughly three types of traditional four-rope grab controls: the first type: controller double handles, motor rotor series resistance control. The second type: controller single handle, differential switch, motor rotor series resistance control. The third type: controller single handle, PLC, frequency converter, absolute value encoder control at the end of the reel. [0003] The first type: The action coordination of the opening and closing mechanism and the supporting mechanism of the grab bucket of the crane depends on the manual operation of the driver, which is labor-intensive and has many misoperations; when the grab bucket is lifting the material, the closing motor alone can easily lead to overload and burnout; the grab bucket The speed is too fast when the bucket...

AI Technical Summary

Problems solved by technology

[0003] The first type: The action coordination of the opening and closing mechanism and the supporting mechanism of the grab bucket of the crane depends on the manual operation of the driver, which is labor-intensive and has many misoperations; when the grab bucket is lifting the material, the closing motor alone can easily lead to overload and burnout; the grab bucket The speed is too fast when the bucket is lowered, causing the closing rope to skip due to severe vibration when the bucket touches the material pile, causing premature wear and tear of the steel rope, and extremely low productivity.

[0004] The second type: due to the complex structure of the differential switch, high manufacturing and processing accuracy and installation accuracy are required, and economic issues are not considered. The more inaccurate it is, the professionals need to constantly adjust and maintain it, otherwise there will be problems such as single motor overload and material spilling

[0005] The third type: support the reel and open and close the end of the reel with an encoder. The encoder needs to be installed with high precision. Due to factors such as long-term vibration and dust, the failure rate is high during use and it is easy to be damaged.

[0006] In short, the single-handle electric control system has become the development trend of crane control in the future, but the existing single-handle electric control system has the problems of complex differential switch structure, high maintenance difficulty, or high installation accuracy and high failure rate of the encoder at the end of the drum.

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