Hydraulic flow sharing system for excavating and pipe laying work
一种分配系统、液压流的技术，应用在管道铺设和维修、机械设备、移土机/挖土机等方向，能够解决晃动、安全事故发生、掉落等问题，达到提高便捷性、防止受损以及安全事故、作业效率提高的效果
Inactive Publication Date: 2010-02-10
VOLVO CONSTR EQUIP HLDG (SWEDEN) AB
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Problems solved by technology
[0011] However, if the traveling speed changes suddenly during the traveling process while the pipelayer is pulling the oil pipe, the oil pipe will shake due to inertia in the traveling direction of the equipment, and serious safety accidents may occur
In this case, the tubing may collide with parts of the equipment adjacent to the tubing, or may come off the wire and fall
Method used
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[0027] Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. Matters defined in the specification, such as detailed structures and elements, are merely specific details provided to help those of ordinary skill in the art fully understand the present invention, and thus the present invention is not limited thereto.
[0028] Such as figure 1 with figure 2 As shown, a hydraulic flow distribution system for excavation and pipeline laying operations according to an embodiment of the present invention includes variable displacement first and second hydraulic pumps 52, 53, and a pilot pump 54, which are connected to an engine 51 connected; the left travel motor 55 and the boom hydraulic cylinder 56, which are both connected to the first hydraulic pump 52; the control valves 57 and 58, which are installed in the central bypass passage 77 of the first hydraulic pump 52, are displaced to control the supply The flow ...
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A hydraulic flow sharing system for excavating and pipe laying work is provided, which can prevent the abrupt change of a traveling speed during traveling through compulsory sharing of the flow rate applied to a working device and a traveling apparatus when a combined operation, in which the traveling apparatus and the working device such as a boom are simultaneously driven, is performed. The hydraulic flow sharing system includes a straight traveling valve (66) shifted, in response to a signal pressure from an outside when a work mode for simultaneously driving a boom cylinder (56), a swing motor (60), a winch motor (61), and left (55) and right (59) traveling motors is selected, to share and supply the hydraulic fluid from the first hydraulic pump (52) to control valves (58,64,65) for the boom cylinder (56), the swing motor (60), and the winch motor (61), and to share and supply the hydraulic fluid from the second hydraulic pump (53) to control valves (57,63) for the left (55) and right (59) traveling motors; an unloading valve (68) open, in response to the signal pressure for shifting the straight traveling valve (66), to prevent overload in center bypass paths (77,62) of the first (52) and second (53) hydraulic pumps; and a selection valve (69) releasing the unloading of the unloading valve (68) when any one of the boom cylinder (56), the swing motor (60), the winch motor (61), and the left (55) and right (59) traveling motors is driven in a shift mode of the straight traveling valve (66).
Description
[0001] Cross References to Related Applications [0002] This application is based upon and claims the benefit of priority from Korean Patent Application No. 10-2008-0077746 filed with the Korean Intellectual Property Office on Aug. 8, 2008, the entire contents of which are hereby incorporated by reference. technical field [0003] The present invention relates to a hydraulic flow distribution system for excavation and pipeline laying operations that can be used when performing pipeline laying operations for pulling or handling heavy tubing by changing working equipment (such as booms, winches, etc.) Prevent sudden changes in the travel speed of the travel device. [0004] More specifically, the present invention relates to a hydraulic flow distribution system for excavation and pipeline laying operations, applying by force distribution when performing a combined operation of simultaneously driving a traveling implement and a working device such as a boom for pulling up a tubi...
Claims
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IPC IPC(8): F15B15/18F16L1/028
CPCE02F9/2239E02F5/10B66C23/44E02F9/2207E02F9/20E02F9/22
Inventor 崔汉钰李京燮
Owner VOLVO CONSTR EQUIP HLDG (SWEDEN) AB