亚博yobo⎛⎝rGoHX⎠⎞ Anti collision bottom hydraulic cylinder with magnetostrictive displacement sensor

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Hydraulic displacement sensor with magnetostrictive bottom for oil cylinder

Release date: June 23, 2019 Number of hits: 186

The hydraulic cylinder is often used in construction machinery. For the cylinder with large vibration and severe impact, the piston of the hydraulic cylinder will hit the bottom of the cylinder due to the above bad working conditions or misoperation, which will cause the whole hydraulic system to be polluted and damaged, which will affect the use of vehicles.

Contents of the invention:

The purpose of the utility model is to provide an anti-collision bottom hydraulic cylinder, which solves the defect of the hydraulic cylinder piston impacting the bottom of the cylinder barrel, and avoids the damage of the hydraulic cylinder and the iron dust pollution caused by the impact and the damage of the entire hydraulic system.

The purpose of the utility model is realized in the following ways: it comprises a hydraulic cylinder, a magnetostrictive displacement sensor is arranged at the end of the cylinder barrel of the hydraulic cylinder, and a permanent magnetic ring is arranged at the end of the piston rod of the hydraulic oil cylinder; The output end of the magnetostrictive displacement sensor is connected to the control end of the relay by a wire, and the output end of the relay is connected to the electromagnetic control end of the electromagnetic on-off valve through the wire.

When the piston rod extension of the hydraulic cylinder is less than the set value, the magnetostrictive displacement sensor does not output the control signal, and the relay remains open circuit. At this time, the electromagnetic on-off valve is maintained as a path, and the pilot oil enters the working valve to control the extension of the oil cylinder; When the extension of the piston rod reaches the set value, the magnetostrictive displacement sensor outputs the control signal, the relay is powered on and closed, and the electromagnetic on-off valve is closed. The pilot oil can not make the piston rod of the hydraulic cylinder continue to extend through the control working valve, which prevents the cylinder piston from hitting the bottom of the oil cylinder and realizes the limit of the piston rod. Since there is no control on other pilot oil circuit, the cylinder piston rod can be controlled to shrink at this time.

The utility model has the advantages of simple structure, reliable operation and small environmental impact, which can effectively prevent the piston of the hydraulic cylinder from hitting the bottom of the oil cylinder, and avoid the damage of the hydraulic cylinder, so as to avoid the iron dust pollution caused by the impact and damage to the entire hydraulic system.

Description of drawings:

The attached drawing is the structural diagram of the utility model.

Specific implementation mode:

Referring to the attached figure, it is composed of hydraulic cylinder 1, magnetostrictive displacement sensor 2, permanent magnetic ring 3, relay 4 and electromagnetic on-off valve 5. The magnetostrictive displacement sensor 2 is installed at the end of the cylinder of hydraulic cylinder 1, the permanent magnetic ring 3 is installed at the end of the piston rod of the hydraulic cylinder 1, the permanent magnetic ring 3 is the external excitation permanent magnetic ring corresponding to the displacement sensor 2; the electrical signal output end of the displacement sensor 2 is connected to the control end of the relay 4 with a wire, and the output end of the relay 4 is connected to the electromagnetic control end of the electromagnetic switching valve 5 through the wire. When the piston rod extension a is less than the set value, the displacement sensor 2 does not output the control signal, and the relay 4 maintains an open circuit. At this time, the electromagnetic on-off valve 5 is maintained as a path, and the pilot oil flows into the T port through the P port of the electromagnetic on-off valve 5, and enters the working valve to control the extension of the hydraulic cylinder 1; When the piston rod extension a reaches the set value, the displacement sensor 2 outputs the control signal, the relay 4 is powered on and closed, and the electromagnetic on-off valve 5 is closed. The pilot oil can not flow out from port t after entering port P, and then the piston rod of hydraulic cylinder 1 can not continue to extend by controlling the working valve, which prevents the piston of hydraulic cylinder 1 from hitting the bottom of oil cylinder and realizes the limit of piston rod.



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