Double oscillating controller for engineering vehicles

Abstract

A double swing control device for an engineering vehicle, which is arranged side by side to supply the pressure oil output from the hydraulic pump to the left swing hydraulic cylinder driving hydraulic circuit of the left swing hydraulic cylinder and to supply the right swing hydraulic cylinder driving hydraulic circuit to the right swing hydraulic cylinder ; Set the left swing hydraulic cylinder action switching valve in the left swing hydraulic cylinder drive oil pressure circuit, set the right swing hydraulic cylinder action switching valve in the right swing hydraulic cylinder drive oil pressure circuit, and control the action switching of these swing hydraulic cylinders In the control pressure signal circuit of the valve, there is a switching control valve for switching the pitching action, single swinging action and double swinging action of the shovel according to the left and right swing hydraulic cylinder. In such a double swing control device of an engineering vehicle, a switching valve with low pressure and a small flow rate and a hydraulic cylinder with the same diameter on the left and right sides can be used, and a piston valve is not required. force.

Description

technical field [0001] The invention relates to a double-swing control device of an engineering vehicle, which is a double-swinging control device of an engineering vehicle that enables a shovel mounted on the main body of the vehicle to perform pitching and swinging actions through the control of a pair of left and right hydraulic cylinders for swinging control device. Background technique [0002] Conventionally, in a construction vehicle such as a bulldozer, a blade (bucket) attached to the front of the vehicle body is used to carry out work of pushing and transporting soil and sand while digging and leveling the ground after digging. In such construction vehicles, it is known that a pair of left and right swing hydraulic cylinders (pitch hydraulic cylinders) composed of double-action hydraulic cylinders are provided between the blade and the vehicle body. The hydraulic cylinder is telescopically driven at the same time, and the blade is controlled to be in a forward pos...

AI Technical Summary

Problems solved by technology

[0009] However, in the above-mentioned conventional double swing control device, since switching valves such as the pitch control valve 108 and the swing control valve 109 are provided in the main hydraulic circuit for swing operation, these pitch control valves 108 and swing control valves 109 are , it is necessary to use a switching valve suitable for high pressure and large flow, so there is an inevitable problem of high cost

[0010] In addition, in the above-mentioned conventional device, in order to perform the pitching operation, it is necessary to make the cross-sectional area of ​​the top side oil chamber 101b of the right swing hydraulic cylinder 101 equal to the cross-sectional area of ​​the bottom side oil chamber 102a of the left swing hydraulic cylinder 102. Two types of hydraulic cylinders with different bore diameters also have the problem of increasing costs

[0011] And, since it is a hydraulic circuit that connects the right swing hydraulic cylinder 101 and the left swing hydraulic cylinder 102 in series, it is necessary to attach a pressure relief valve to each hydraulic cylinder 101, 102 when one of the hydraulic cylinders first reaches the end of the stroke. There are problems such as the piston valve of the oil, and because of the above-mentioned series arrangement, there is a problem that it cannot output a large force during the pitching operation and the double swinging operation.

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