The working principle of the crane

The working principle of the crane mainly shows that bai has a rotating drum under the boom, and a wire rope is wound on it. The wire rope pulls the previous boom out through the pulley on the top of the next boom, and so on. When retracting, the reel is turned upside down to recover the wire rope, and the boom retracts under its own weight.

In addition, some truck cranes have sleeved plunger cylinders installed in the telescopic booms, but such applications are extremely rare. Because the multi-stage plunger cylinder is expensive, and the boom will bend elastically when loaded, which has a great impact on the life of the cylinder.

Multi-action hoisting machinery that vertically lifts and horizontally carries heavy objects within a certain range. Also known as crane. Belongs to material handling machinery. The working feature of the crane is to do intermittent movement, that is, the corresponding mechanism of reclaiming, transporting, unloading and other actions in a working cycle is alternately working.

Extended information:

The crane user unit should always inspect and maintain the crane machinery in use, and formulate a regular inspection management system, including daily inspection, weekly inspection, monthly inspection, and annual inspection, and conduct dynamic monitoring of the crane, and find abnormal conditions at any time and timely Treatment, so as to ensure the safe operation of crane machinery.

(1) Daily inspection.

The routine maintenance items in which the driver is responsible for the work mainly include cleaning and sanitation, lubrication of the transmission parts, adjustment and fastening work. Test the sensitivity and reliability of the safety device by running, and monitor for abnormal sounds during operation.

(2) Weekly inspection.

It is jointly carried out by maintenance workers and drivers. In addition to daily inspection items, the main content is visual inspection, checking the safety status of hooks, retrieval devices, wire ropes, etc., the sensitivity and reliability of brakes, clutches, and emergency alarm devices. Observe whether there are abnormal noises and overheating of the transmission parts.

(3) Monthly inspection.

The inspection is organized by the equipment safety management department and carried out jointly with the relevant personnel of the user department. In addition to the weekly inspection, it mainly conducts state inspections on the power system, lifting mechanism, slewing mechanism, operating mechanism, and hydraulic system of the crane machinery, and replaces wear and deformation. , Cracks and corroded parts, check the reliability of the feeder, controller, overload protection and safety protection device for the electrical control system.

Check the failure signs caused by the leakage, pressure, temperature, vibration, noise and other reasons of the crane equipment through the test operation. After observation, the structure, support, and transmission parts of the crane are subject to subjective inspection to understand and master the technical status of the entire crane, and to check and determine the source of the abnormal phenomenon.

(4) Annual inspection.

The unit leader organizes the equipment safety management department to take the lead, and conducts jointly with relevant departments. In addition to the monthly inspection items, it mainly conducts technical parameter testing and reliability tests on the crane machinery, and through the testing equipment, the wear of the crane machinery and the moving parts of the working mechanism , Welds of metal structures, test flaw detection, and evaluate the operating technical status of lifting equipment through the test of safety devices and components. Arrange plans for major repairs, renovations, and renewals.