Control system of bolt mechanism and crane

Abstract

The invention relates to a control system of a bolt mechanism, which comprises a hydraulic oil tank, an oil pump, a first reversing valve, a multi-channel group, an arm pin oil cylinder, a cylinder pin oil cylinder, a second reversing valve and a third reversing valve. The first reversing valve is connected with the oil pump and comprises a first outlet / inlet and a second outlet / inlet. The multi-channel group comprises a first channel, a second channel, the first outlet / inlet and the second outlet / inlet, wherein the first outlet / inlet of the multi-channel group is communicated with the first channel, the second outlet / inlet is communicated with the second channel, the first channel of the multi-channel group is connected with the first outlet / inlet of the first reversing valve, and the second channel of the multi-channel group is connected with the second outlet / inlet of the first reversing valve. The second reversing valve and the arm pin oil cylinder are sequentially connected between the first outlet / inlet and the second outlet / inlet of the multi-channel group, and the third reversing valve and the cylinder pin oil cylinder are sequentially connected between the second outlet / inlet and the first outlet / inlet of the multi-channel group.

Description

technical field [0001] The invention relates to a bolt mechanism control system, in particular to a bolt mechanism control system for the telescopic arm of construction machinery and a corresponding crane. Background technique [0002] At present, most of the large-tonnage and super-large-tonnage truck cranes at home and abroad use single-cylinder multi-section mechanical telescopic arms, and the mechanical telescopic arms cooperate with the latch mechanism during the telescopic process to complete the telescopic process. The control mode of the existing bolt mechanism control system is to supply oil through the gear pump, and the hydraulic oil reaches the cylinder pin or the arm pin after passing through the first directional control valve and the second directional control valve, wherein the second directional control valve is used to control the hydraulic pressure. Whether the passage between the oil circuit and the gear pump or the oil tank is conducted, and the first di...

AI Technical Summary

Problems solved by technology

Therefore, once the mechanical interlock fails, the cylinder pin and the arm pin may retract at the same time, which will cause the boom to slide out of control from a high place, causing the crash of the machine and the death of the machine. Therefore, this mechanical interlock There is a great security risk

In addition, in the existing bolt mechanism control system, during the dynamic telescopic process of the mechanical telescopic arm, the hydraulic oil circuit must be under the action of pressure oil all the time to control the cylinder pin or one of the arm pins to be in a retracted state , it aggravates the leakage of the system, especially when the central channel of the telescopic cylinder is selected for oil supply, the central channel is easily damaged and oil leaks

Images