Oil cylinder stroke detection device, hydraulic system and engineering machinery having hydraulic system
A stroke detection and hydraulic system technology, applied in the direction of fluid pressure actuating devices, etc., can solve the problems of complex structure and difficult maintenance, and achieve the effect of good limit effect, stable working performance, and easy processing and assembly.
Active Publication Date: 2012-09-05
SANY MARINE HEAVY IND +1
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[0005] The present invention aims to provide an oil cylinder stroke detection device, a hydraulic system with the detection device, and construction machinery with the hydraulic system, which can solve the technical problems of complex structure and difficult maintenance in the oil cylinder stroke detection device in the prior art
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[0023] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but the present invention can be implemented in many different ways defined and covered by the claims.
[0024] In order to solve the technical problems of complex structure and difficult maintenance in the oil cylinder stroke detection device in the prior art, one aspect of the present invention provides a new type of oil cylinder stroke detection device, please refer to figure 1 , when the piston rod and the piston in the oil cylinder 10 pass through the position of the detection element respectively, since the piston rod and the piston are the permeable magnetic cores (usually No. 45 steel), when the excitation coil 1 is energized and excited, due to the The area is different, and the change of the magnetic field affected by it is also different, and the electric potential sensed by the induction coil 2 will change, so as to detect the position of th...
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The invention provides an oil cylinder stroke detection device. The detection device comprises a magnet exciting coil ring, an induction coil and a position signal generator, wherein the magnet exciting coil ring is used for generating an alternating magnetic field orthographical to the cross section of an oil cylinder; the inner circumference diameter of the magnet exciting coil ring adapts to the outer circumference diameter of the oil cylinder; the induction coil is used for generating an induction potential under the action of the alternating magnetic field, generating a first variation potential when a piston passes through the magnet exciting coil ring and generating a second variation potential when a piston rod passes through the magnet exciting coil ring; and the position signal generator is used for generating a position signal after the induction ring generates the pair of first variation potential and second variation potential. Moreover, the invention also provides a hydraulic system having the detection device and engineering machinery having the system. The detection device provided by the invention has the advantages of simple structure, easy processing and assembly, capability of freely adjusting installation position, stable working performance, no damage to a sealing element of the oil cylinder, good position limiting effect and suitability for various hydraulic systems needing to be limited.
Description
technical field [0001] The invention relates to a detection device, in particular to an oil cylinder stroke detection device. In addition, the present invention also relates to a hydraulic system including the above-mentioned oil cylinder stroke detection device and a construction machine with the hydraulic system. Background technique [0002] Modern construction machinery has a high degree of automation and mechatronics. It is often necessary to detect the position of the piston in the hydraulic cylinder of the working device and the traveling device to control the stroke of the cylinder, that is, to detect the displacement of the cylinder piston. , especially for the hydraulic cylinder in the stroke control sequential motion circuit, the detection of the moving position of its piston is essential. [0003] Commonly used cylinder stroke detection systems come in various forms, including built-in and external. Among them, the built-in detection system usually installs a di...
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IPC IPC(8): F15B15/28
Inventor 廖荣华单俊峰李翠英
Owner SANY MARINE HEAVY IND