Hydraulic control system of winch mechanism and crane
A hydraulic control system and hoisting mechanism technology, which is applied to cranes, hoisting devices, clockwork mechanisms, etc., and can solve problems such as falling loads, shaking heavy objects, and colliding with boom structural parts
Active Publication Date: 2019-04-02
ZOOMLION HEAVY IND CO LTD
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Problems solved by technology
Repeatedly, the movement speed of the winch motor changes repeatedly when the opening of the main reversing valve is small, and the load shakes
Especially under high-temperature and heavy-load conditions, due to the increased leakage of the winch motor and the main reversing valve, the unevenness of the speed of the winch motor will be further aggravated, which will easily cause the heavy objects to be hoisted to shake, and even Serious safety accidents such as load drop, collision or breakage of boom structural parts
Method used
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Embodiment Construction
[0029] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.
[0030] In the present invention, unless stated otherwise, the various "oil passages" refer to paths for hydraulic oil to flow, which should generally allow the required hydraulic control elements (ie, hydraulic valves) to be set. , in order to achieve or improve its performance. For example, the "bypass oil drain oil passage" in the present invention generally does not include the structural form of the oil passage formed only in the valve block, so as to arrange various oil drain control valves 11 thereon, and / or, It facilitates the detachable connection of the bypass oil drain module provided with the oil drain control valve 11 .
[0031] In order to better ...
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The invention relates to the field of engineering machinery and discloses a hydraulic control system of a hoisting mechanism and a crane. The hydraulic control system of the hoisting mechanism comprises a winch motor (1), a first working oil circuit (2) connected to an oil pressing cavity of the winch motor (1), and a second working oil circuit (3) connected to an oil return cavity of the winch motor (1). A balance valve (4) is arranged on the second working oil circuit (3), and an external control port of the balance valve (4) is connected to the first working oil circuit (2) through an external control oil circuit (5). The hydraulic control system further comprises a bypass leakage oil circuit (6) connected between the first working oil circuit (2) and an oil return circuit. By the adoption of the hydraulic control system, the uniformity of the motion speed of the winch motor (1) can be effectively improved in the starting process of hoisting operation, and shaking of loads is relieved or avoided.
Description
technical field [0001] The invention relates to the field of engineering machinery, in particular to a hydraulic control system of a winch mechanism. On this basis, the present invention also relates to a crane with the hydraulic control system of the hoisting mechanism. Background technique [0002] Hoisting mechanisms usually use a drum to wind a wire rope or chain to lift or pull a heavy object. For example, in a truck crane, the winch mechanism is controlled by a hydraulic control system to control the lifting and lowering of heavy objects through the winch motor in the hydraulic control system. [0003] In order to make the movement stable (especially during the lowering process), the hydraulic control system of the hoisting mechanism can be provided with a balance valve, so as to feedbackly adjust the valve port opening of the balance valve according to the movement speed of the load. However, the load feedback characteristic of the balance valve also has deficiencie...
Claims
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IPC IPC(8): B66D1/44B66D1/08
CPCB66C2700/03B66D1/08B66D1/44
Inventor 黄杰郭堃罗贤智李英智
Owner ZOOMLION HEAVY IND CO LTD