Control device for controlling pilot control valve and bulldozer comprising control device
A pilot control valve and control device technology, which is applied to earth movers/excavators, construction, etc., can solve the problems of complex structure and high cost
Active Publication Date: 2015-02-11
CATERPILLAR INC
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Problems solved by technology
[0005] In the above-mentioned control device, for the floating position of the rocker and the pilot control valve, an electromagnetic holding mechanism and a mechanical pre-sensing mechanism are used in combination, so the structure is complicated and the cost is high
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[0033] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with exemplary embodiments.
[0034] figure 1 An exemplary bulldozer 100 is shown. The bulldozer 100 includes a frame, a control room 11 and a work implement 12 . In one particular embodiment, work implement 12 may be a blade 13 capable of pushing an object, such as dirt. The bulldozer 100 may include at least one oil cylinder operatively connected with the working tool 12 and used to control the action of the working tool 12 . In one embodiment, blade 13 may be connected to two lift cylinders (lift cylinders) 14 that may raise and lower blade 13 . To this end, the bulldozer 100 also includes a pilot control valve for controlling the lift cylinder 14 . Blade 13 can also pivotally connect two inclined oil cylinders 15 ( figure 1 Only one tilt cylinder is shown in the figure), the tilt cylinder 15 can make the blade 13 tilt to the left or to a certai...
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The invention relates to a control device for controlling a pilot control valve with a float position. The control device comprises a control rod, a housing, a sleeve fixedly connected with the housing, and a cover capable of axially moving in the sleeve under the action of the control rod, wherein a plurality of holes are formed in the wall of the sleeve, a roll ball is accommodated in each hole, and the roll balls are pushed and pressed on the peripheral surface of the cover by a compaction mechanism; the compaction mechanism is arranged on the outer side of the sleeve in a manner of surrounding the sleeve; a peak-shaped protrusion is formed on the peripheral surface of the cover; when the cover moves to a first position, a first surface of the protrusion is in contact with the roll balls; when the cover further axially moves from the first position, the protrusion is across the roll balls, and the cover is kept in a second position by a second surface of the protrusion, the compaction mechanism and the roll balls. According to the control device, the functions of pre-perceiving and keeping the float position are provided by a simple structure. The invention further relates to a bulldozer comprising the control device.
Description
technical field [0001] The present invention relates to an operating device for controlling a pilot control valve in a working machine such as a bulldozer, and more particularly to an operating device for controlling a pilot control valve having a floating position and having a pre-sensing function and a holding function for the floating position. Background technique [0002] Hydraulic systems are usually used in working machines such as bulldozers, and the operator controls the pilot control valve in the hydraulic system by manipulating the rocker to switch on or off the corresponding oil circuit, so that the working tool performs the desired action. For example, in a typical bulldozer application, when the operator tilts the stick from neutral in one direction (for example, to the right), the lift cylinders extend and the bulldozer blade lowers, and when the operator tilts the stick in the other When tilting in one direction (for example, to the left), the lift cylinders ...
Claims
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Inventor 赵丙龙吴海峰游善兰
Owner CATERPILLAR INC