Multi-path valve for wheel excavator

Abstract

The invention discloses a multi-path valve for a wheel excavator. The multi-path valve for the wheel excavator comprises a second oil inlet, a first oil inlet, an oil returning opening, a movable armoil linkage path, a bucket oil linkage path, a bucket rod oil linkage path and a guiding oil way. All the oil ways communicate with one another in series and communicate with the second oil inlet andthe oil returning opening to form a loop, and the bucket rod oil linkage path communicates with the first oil inlet. The multi-way valve for the wheel excavator is further provided with a third oil inlet, a movable arm oil cylinder, a bucket oil cylinder, a bucket arm cylinder and an auxiliary oil linkage way. The movable arm oil linkage path is further provided with a corresponding movable arm reversing valve, the bucket oil linkage path is further provided with a corresponding bucket reversing valve, the bucket rod oil linkage path is further provided with a bucket rod reversing valve, and the auxiliary oil linkage path is further provided with an auxiliary reversing valve. The third oil inlet communicates with the auxiliary reversing valve. The movable arm oil cylinder is connected withthe movable arm reversing valve, the bucket oil cylinder is connected with the bucket reversing valve, and the bucket arm cylinder is connected with the bucket rod reversing valve. Compared with theprior art, the multi-path valve has the beneficial effects that the coordination of composite actions of the excavator is improved, and therefore the working efficiency is improved.

Description

technical field [0001] The invention relates to the field of excavator hydraulic oil circuit control, in particular to a multi-way valve for a wheeled excavator. Background technique [0002] With the continuous development of society and the continuous increase of national construction needs, wheeled excavators are used more and more, and the scope of use is also wider and wider. The development of mineral resources, roads and water conservancy construction are all essential. The performance of wheeled excavators is becoming more and more perfect, but at the same time people have higher and higher requirements for the coordination and comfort of wheeled excavators. , while the compound action process is a direct reflection of the coordination and comfort of the wheeled excavator. [0003] Since the multi-way valve used in the traditional wheeled excavator is a multi-way valve of the domestic throttling system, it mainly confirms the opening size and sequence of the spools ...

AI Technical Summary

Problems solved by technology

[0003] Since the multi-way valve used in the traditional wheeled excavator is a multi-way valve of the domestic throttling system, it mainly confirms the opening size and sequence of the spools of each working joint of the multi-way valve according to the operating requirements of the working conditions, and passes the external confluence and flow of the multi-way valve. The internal throttling method of the system adjusts the flow distribution of each working link during the compound action; but in the actual operation process, because the stick cylinder in the excavator has a thick bore and a long stroke, the stick cylinder is relatively large during the compound action. The movement of the bucket cylinder and the boom cylinder is also slow, and the stick cylinder pushes the stick to rotate slowly, which causes uncoordinated digging actions when the excavator excavates

And after the excavator excavates the material lower than the machine surface with a bucket, in the process of transferring the material to the transport vehicle, the excavator needs to perform the compound action of body rotation and lifting arm, but due to the excavator's rotation action and lifting arm The arm action is supplied by different oil pumps. The oil supply required by the swing motor is less, and there is a surplus of oil supply for the swing motor by a single hydraulic pump, which leads to the excessive speed of the swing motor and poor operating comfort; while the swing arm The weight of the load is heavy, and the lifting of the boom requires a large flow rate. The oil supply to the boom by a single oil pump cannot meet the lifting requirements of the boom. When lifting the boom, the excavator must first complete the body rotation, and then do the boom lifting action, resulting in the compound action not being executed smoothly and the operation not coordinated, thus affecting work efficiency

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