Hydraulic cylinder retraction limiting valve device and hydraulic cylinder device having retraction limiting function
A technology of retraction limit and hydraulic cylinder, applied in the direction of fluid pressure actuating device, servo motor assembly, mechanical equipment, etc. Seal failure and damage, easy processing and long service life
Inactive Publication Date: 2018-10-16
张青尧 +2
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Problems solved by technology
Therefore, the sealing ring of the limit valve in action is repeatedly subjected to high pressure and deformed seriously, which will easily lead to damage to the sealing ring, and the limit valve will fail or fail.
[0006] In addition, because there is a hole diameter change between the oil outlet chamber and the oil outlet valve hole, that is, the oil outlet chamber aperture is larger than the oil outlet valve hole, and there is a certain excessive chamfer, the sealing ring on the limit valve spool reciprocates. It is also easy to wear the sealing ring through the transition of this chamfer
Especially when the piston of the above-mentioned hydraulic cylinder is extended, when the sealing ring on the valve core passes through the junction of the oil outlet valve hole and the oil outlet chamber, that is, the chamfer, the high pressure in the oil outlet valve hole acts on the valve core. The sealing ring on the spool will be squeezed, expanded and deformed, and the wear will be more serious, which will further accelerate the damage of the sealing ring and reduce the service life, requiring frequent maintenance and replacement of the sealing ring
[0007] In addition, in the prior art, especially the hydraulic cylinders used for tractor lifting and loading agricultural implements, the limit hydraulic cylinders are used alone to drive an agricultural implement, and the reliability of a single hydraulic cylinder to drive an agricultural implement is not reliable. Large, the overall structure is not flexible
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[0028] The hydraulic cylinder retraction limit valve device of the present invention is composed of a limit valve and an elastic positioning block.
[0029] The limit valve includes a valve body 1, a valve core 2, a valve core sleeve 3, and a valve core limit screw 4;
[0030] The valve chamber holes opened in the valve body 1 are, from top to bottom, the upper threaded hole 11, the oil inlet and outlet chamber 12, the oil inlet and outlet valve hole 13, and the lower threaded hole 14;
[0031] The spool cover 3 is threaded and fixedly connected with the upper threaded hole 11. The spool 2 is composed of a valve stem 21 and a plunger 22. The valve stem 21 is slidingly fitted with the center hole of the spool cover 3. The center hole is provided with sealing ring grooves 31, 33 and sealing rings 32, 34 to cooperate with the valve stem 21 to seal;
[0032] The plunger 22 of the spool 2 is slidingly fitted with the oil inlet and outlet valve hole 13, and a sealing ring groove 13...
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The invention provides a hydraulic cylinder retraction limiting valve device and a hydraulic cylinder device having the retraction limiting function. The hydraulic cylinder retraction limiting valve device is composed of a limiting valve and an elastic locating block. The limiting valve comprises a valve body (1), a valve element (2), a valve element sleeve (3), a valve element limiting threaded rod (4) and an oil pipe connector (5). Valve cavity holes formed in the valve body are an upper threaded hole (11), an oil inlet and outlet cavity (12), an oil inlet and outlet valve hole (13) and a lower threaded hole (14) sequentially from top to bottom. A seal ring groove (131) and a seal ring (132) are formed in the oil inlet and outlet valve hole (13) and are matched with a valve element plunger (22) and the oil inlet and outlet valve hole (13) in a sliding manner to conduct seal. The elastic locating block is composed of a pressing rod mechanism capable of sliding, wherein the pressing rod mechanism is connected with and installed on a piston rod of the hydraulic cylinder and is jacked out under the action of a spring. The hydraulic cylinder retraction limiting valve device is convenient to machine and manufacture, particularly suitable for automatic locating control over retraction of a hydraulic cylinder for enabling a tractor to ascend and descend a loaded farm tool, long in service life and good in reliability.
Description
technical field [0001] The invention relates to a limit valve device used in conjunction with a hydraulic cylinder to automatically position the retraction of the piston rod of the hydraulic cylinder, especially for the hydraulic cylinder (piston rod) retraction automatic positioning control limit for tractor lifting and loading farm implements A valve device, and a hydraulic cylinder device using a limit valve device. Background technique [0002] When the tractor loads the agricultural implements to work in the farmland, the loaded agricultural implements must fall, and then the operation is carried out. The height of the loaded agricultural implements should be adjusted according to the needs before the operation. Farm tools often encounter various obstacles when working in the field. At this time, it is necessary to lift the farm tools first, and then lower the farm tools to the previously set height to continue working; When working on another piece of farmland, it is ...
Claims
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IPC IPC(8): F15B13/02F15B15/14
CPCF15B13/02F15B15/1423
Inventor张青尧闫明李蒋方遒
Owner张青尧