Working principle of frequency conversion speed regulation and detection of hanging beam

Dec 20th,2024 1114 Views

The maintenance trailer consists of a trailer, a bracket, a single beam, a vertical beam that can be folded on the single beam, a working platform that can be rotated and folded into a vertical beam, and a transmission mechanism.

The operating mechanism of a single-beam crane is used to move heavy objects longitudinally and horizontally or adjust the working position of the crane. It is generally composed of an electric motor, a reducer, a brake, and wheels. The luffing mechanism is only equipped on a boom crane. The amplitude decreases when the boom is raised and increases when it is lowered. It is divided into balanced luffing and unbalanced luffing.

The horizontal distance between the rotation center line of a gantry crane and the plumb line of the object-picking device, in m. The amplitude of a non-rotating boom crane refers to the horizontal distance between the center line of the sling and the rear axle of the boom or other typical axis. When the object-picking device of a Konecranes crane can be placed below the ground or the top surface of the track, the lowering distance is called the descent depth.

That is, the vertical distance between the lower working position of the sling and the horizontal support surface of the crane. Each working part can be folded on a trailer with taillights and brake mechanisms, and transported by a tractor for long distances on the highway, making the dispatch of bridge inspection and maintenance equipment flexible, without the need for installation, disassembly and commissioning on the bridge site, and can be put into use after being transported to the site, greatly improving the efficiency of bridge inspection and maintenance, compact structure, rapid stacking, safe operation, and can well adapt to the characteristics of different working surfaces.

The variable frequency speed control electronic control equipment is programmable and consists of optional power supply line switch, line contactor, auxiliary switch, auxiliary relay, etc. Inspection of the safety protection device of the single beam crane Whether the overload protection device is sensitive and reliable and meets the design requirements, the opening pressure of the hydraulic overload protection device; whether the comprehensive error of the alarm and power source cut-off setting point of the mechanical, electronic and comprehensive overload protector meets the requirements. The electrical system and control circuit of the single-beam crane are divided into several units or nodes according to their distribution positions, including power supply introduction, trolley operation control box (device), trolley limit switch, electric hoist control box, lifting limit switch, control button, motor, speed regulating resistor, remote control device, etc. Each control unit or node is connected by cables with special connection devices. The connection between the special connection device and the cable is all connected in a firm and reliable way, and special insulating materials are injected into the cavity of the connection point between the special connection device and the cable. After curing, the special connection device and the cable form a whole; solve the connection reliability and shockproof problems; through the different models of special connection devices, the special connection devices used in the entire single-beam crane electrical system are not interchangeable (except for the lines that need to be interchanged during debugging), and the end faces of all connection device joints are marked with line numbers; the installation of the single-beam crane electrical circuit is completed in the factory; avoid line installation errors; realize fool-proof connection of all circuits.

The effective benefit achieved is that all electrical control units can realize the interface of China standardization, realize the fast, reliable and accurate connection of electrical information system, and can realize the installation and replacement of electrical circuits without the work of professional electrical engineering and technical management personnel, which greatly saves the cost of electrical installation of single beam crane, the time of electrical circuit replacement and the human capital resources of technical companies. Make the installation and replacement of electrical appliances of single beam crane as simple as using household appliances.

After the operation, the single beam crane should retract all sections, put them on the front boom bracket, and hang the hook. The boom crane rotates the boom to the front of the crane and reduces the elevation angle to 40-60 °. All brakes should be fixed and fixed, and the operating room door should be closed and locked. Pull the outrigger control valve to retract the outrigger, insert the outrigger fixing pin, fix the outrigger, and put the auxiliary tools such as slide wood and rope into the tool box. Depress the engine clutch pedal, release the hydraulic pump, and then transfer the crane or stop the engine to stop the engine.

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