Research on the Control Program of the Extension Arm for Xiagong Chusheng Aerial Work Truck

In the past 25 years of work in the street lamp management office, the author has operated four types of high-altitude trucks with different performances. Through personal experience, the author discovered that control exists between the mechanical telescopic boom and the hook steel cable during operation of the aerial working vehicle. Some deficiencies and security risks. The reason is that when the operator directly telescopes the arm in the hoisting operation without first placing the hook, it easily causes the wire rope to break off. This will cause tens or even hundreds of pounds of hooks to fall and injure the safety of life. Similar incidents frequently occur. . How to add a control system so that the hook can be placed in place before the telescopic arm operation, the formation of a chain of control, after painstaking research and exploration, and debugging at our high-altitude trucks, and achieved good results.

First, the control of telescopic arm operation program improvement

A primary control system is installed between the buttons of the control telescopic arm, aiming at disconnecting the power of the control button of the telescopic arm when the wire rope of the hook does not reach a sufficient length, so as to control the DC contactor and the extension of the telescopic arm. When the relay is unable to get the working power, when the wire rope of the hook is put into a sufficient length, it can enter the next operation procedure, effectively control and prevent the occurrence of misoperation.

Second, the control circuit principle before and after the control of the telescopic arm

1, the original line control diagram

The operation procedure is as follows: The control of the original line, there is no interlocking device between the telescopic boom and the lifting button of the hook, and each button can be operated at the same time. Therefore, when the misoperation occurs, it cannot be effectively controlled. This is the root of the problem.

2. Improved Line Control Diagram

The operation procedure is as follows. Press the release button, put the solenoid valve into operation, the hook begins to drop, and at the same time, the DC contactor C2 and the time delay relay h get electricity, the contactor pulls in and the delay switch starts to record time, (the length of the delay The length of our experiment was set to approximately 20 seconds with the hook lowered enough to extend the telescopic boom until the time delay relay h and contactor C2 were closed and the telescopic arm button was energized.

When the DC contactor C2 pulls in, the auxiliary contact C-1 of the contactor is opened, the power of the release button is cut off, and the auxiliary contact C-2 is closed to form a self-protected circuit of the DC contactor C2. Hoisting finishes the knot

The beam, the upper and lower arms return to their original positions, and the limit switch is opened. At the same time, the DC contactor C2 and the time delay relay h are de-energized, stop working, and the circuit is restored to its original state. The next working procedure is still the same as above.

Third, the proposal

The electrical components used in this system are ordinary electrical components and are not dedicated to vehicles. If ordinary electrical components are installed in vehicles, the vibration may be relatively large, and the screws and fasteners on each component of the system may become loose or fall off easily. It will inevitably affect the control effect and hinder normal operation. In the future, in order to ensure the stability of the telescopic boom control system for high-altitude aerial vehicles, commissioning will continue and the best control components will be selected.

The following is a partial product display of Xigong Chusheng Aerial Work Truck:

Jiangling Aerial Vehicle

Dongfeng 145 Aerial Vehicle

Xigong Chusheng (Hubei) Special Purpose Vehicle Co., Ltd. is a research, development, manufacturing, sales Chusheng brand tanker, Dongfeng tanker, Foton tanker, liberation tanker, sprinkler, sanitation truck garbage truck , garden sprinklers, Dongfeng sprinklers, fire sprinklers, high pressure cleaners, concrete mixers, cement mixers, refuellers, oil tankers, sewage suction trucks, garbage trucks, suction trucks, bulk cement trucks, powder materials Vehicles, truck-mounted crane trucks, truck cranes, coach vehicles, led advertising vehicles, flatbed trucks, Excavator trucks, aerial vehicles, and other special vehicles, a total of seven series of more than 200 varieties of wholly-owned private enterprises It is a member of Dongfeng Company, FAW Group, CNHTC Group and Beiqi Futian Company. It covers an area of ​​150,000 square meters, construction area of ​​100,000 square meters, more than 560 employees and more than 180 engineering technicians. More than 300 sets of equipment (sets), of which there are advanced flexible sealing device and the front end of the tank head and 8 × 9000 electronic control digital display machine, 9 m puzzle automatic welding machine, Germany Burger large displacement double screw air compression Machines, PLC control wind cycle machine peening rooms, water spin paint spray room, drying room and machining, punching plasma cutting machines and other leading domestic equipment and tooling molds and testing equipment, total investment of more than 90 million yuan. Strong technical force, advanced inspection methods, and perfect products have won wide acclaim from users for their high quality and low price, reliable performance, and timely service.

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