Lead screw displacement self-detection type hydraulic cylinder

Abstract

The invention discloses a lead screw displacement self-detection type hydraulic cylinder, and belongs to the technical field of hydraulic cylinders. The hydraulic cylinder comprises a cylinder barreland a piston rod, a cylinder bottom is fixed to the left end of the cylinder barrel, a piston is arranged at the left end of the piston rod, a lead screw is arranged at the axis of the piston rod, theleft end of the lead screw penetrates through the axis of the cylinder bottom, the lead screw makes contact with the cylinder bottom in a rotating mode, a sealing device is arranged at the contact position between the lead screw and the cylinder bottom, a threaded sleeve is fixed to the piston rod and is arranged on the lead screw in a matched mode, and a rotation detection device is fixed to theleft side of the cylinder bottom and is used for detecting rotation data of the left end of the lead screw. The hydraulic cylinder has the advantages that by using the characteristics of a lead screwnut structure, the linear motion of the piston rod is converted into rotation motion, and the displacement of the piston rod is measured according to the rotation number of the lead screw; the hydraulic cylinder is convenient in measurement, suitable for working in a high-temperature and high-pressure oil environment for a long time, capable of adapting to a high-frequency pressure pulse environment and high in stability; and the hydraulic cylinder is simple in structure, easy to implement, economical, practical and capable of being popularized and used in various oil cylinders.

Description

technical field [0001] The invention relates to the technical field of hydraulic cylinders, in particular to a screw displacement self-detection hydraulic cylinder. Background technique [0002] As the executive element of the hydraulic system, the hydraulic cylinder has the characteristics of simple transmission structure, flexible action, and can transmit force. It is widely used in construction machinery. And its displacement measurement device has also made great progress in recent years, from external displacement sensors to built-in various physical sensors, and then to the detection scale engraved on the piston rod, each of these structures has its own characteristics and practicability. [0003] Using the magnetic displacement sensor combined with the waveguide, magnetic ring, support block and other structures inside the piston rod to measure the displacement, the overall method is to use the built-in sensor. This solution has limitations in application, requires hi...

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Problems solved by technology

[0003] Use the magnetic displacement sensor and combine the waveguide, magnetic ring, support block and other structures inside the piston rod to measure the displacement. The overall method is to use the built-in sensor. This solution has limitations in application, requires high installation accuracy, and is difficult to repair when problems occur.

[0004] External piston rod displacement sensor, the sensor needs to occupy space other than the oil cylinder and the installation is complicated, it is difficult to use in narrow working conditions;

[0005] The built-in stroke sensing hydraulic cylinder is used to work by ultrasonic, photoelectric and other effects. The disadvantages are often cumbersome assembly, difficult processing and production, and there is a certain scope of application. For example, it cannot be in high temperature and high pressure oil for a long time. It is easy to wear and tear, cannot adapt to the environment of high-frequency pulse pressure, etc., and it is not easy to repair when a fault occurs

[0006] The method of making a scale on the piston rod, and then measuring it with an external magnetic sensor, although this method has high measurement accuracy, it will take up external space, and the installation accuracy is very high, and its protection for the sensor is also relatively low. High requirements, not suitable for most hydraulic cylinders

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