Differential hydraulic control system and method, and crane
A hydraulic control system and hydraulic cylinder technology, which is applied in the hydraulic field, can solve the problems of not being able to meet the requirements of the working stroke and the auxiliary stroke, and achieve the effect of improving the working efficiency
Active Publication Date: 2017-01-04
XUZHOU HEAVY MASCH CO LTD
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Problems solved by technology
In the differential hydraulic system, the hydraulic cylinder is in a differential state, which can meet the requirements of the auxiliary stroke, but cannot meet the requirements of the working stroke; in the non-differential hydraulic system, the hydraulic cylinder is in a non-differential state, which can meet the requirements of the working stroke , but cannot meet the requirements of the auxiliary travel
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[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.
[0030] The relative arrangements of components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.
[0031] At the same time, it should be understood that, for the convenience of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship.
[0032] Techniques, methods and devic...
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The embodiment of the invention discloses a hydraulic differential control system and a hydraulic differential control method as well as a crane, and relates to the hydraulic technical field. The system comprises a first reversing valve (1), a second reversing valve (2), a check valve (3), a moment limiter (4) and a controller (5). The first reversing valve (1) is arranged on an oil path through which a rodless cavity of a hydraulic differential cylinder (7) is communicated with an oil source, and communicated with an oil tank; the second reversing valve (2) is respectively communicated with the first reversing valve (1), and the rodless cavity and a rod cavity of the hydraulic differential cylinder (7); the check valve (3) is arranged on the oil path through which the second reversing valve (2) is communicated with the oil tank; the moment limiter (4) is connected with the controller (5) to transmit the actual hoisting weight detected to the controller (5); the controller (5) is connected with the control end of the second reversing valve (2) so as to control the second reversing valve (2) to change over and switch the differential state and the non-differential state of the hydraulic differential cylinder (7).
Description
technical field [0001] The invention relates to the field of hydraulic technology, in particular to a differential hydraulic control system and method, and a crane. Background technique [0002] The working action of the crane on the car consists of four actions: slewing, luffing, telescopic, and lifting. The luffing action of the crane is driven by the hydraulic cylinder. When the hydraulic cylinder is extended, the working range of the crane becomes smaller, and when the hydraulic cylinder is retracted, the working range of the crane increases. [0003] In non-working conditions such as crane transportation and car collection, the boom is fully retracted and placed on the chassis support, and the hydraulic cylinder is at the minimum stroke position. Before the crane enters the working state, the operator operates the crane to perform a luffing action to move the crane to the working position. This process belongs to the auxiliary stroke (also called the non-working stroke...
Claims
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IPC IPC(8): F15B21/08F15B11/08B66C23/82
CPCB66C13/16B66C13/20B66C23/82F15B11/08F15B21/08F15B2211/253
Inventor 朱涛杜孝杰曾博泰赵瑞学
Owner XUZHOU HEAVY MASCH CO LTD