Ultra-long stroke hydraulic cylinder built-in sensor protection device

Abstract

The invention discloses a built-in sensor protection device for an ultra-long-stroke hydraulic cylinder, which includes an inner protective tube, an open flange, a supporting piston, an outer protective tube, a magnetic ring, a magnetic ring seat, a stopper, a main piston, a boss and a boss nut The present invention provides an end supporting point for the built-in sensor of the hydraulic cylinder through the main piston, and provides a middle supporting point for the built-in sensor of the hydraulic cylinder through the supporting piston. The support can better avoid the bending problem of the built-in sensor protection device of the ultra-long stroke hydraulic cylinder, and has the characteristics of simple structure and outstanding effect.

Description

technical field [0001] The invention relates to the field of hydraulic cylinders, more specifically, it relates to a built-in sensor protection device for an ultra-long stroke hydraulic cylinder. Background technique [0002] The built-in sensor of a general hydraulic cylinder is installed with a magnetostrictive displacement sensor, which is a slender rod structure with an electronic head and a waveguide rod; when the stroke of the hydraulic cylinder is less than 3 meters, the displacement sensor can be directly installed on the cylinder without a protective device. Inside, but when it is greater than 3 meters, the slender rod of the sensor will sag under the action of gravity and will be bent when the hydraulic cylinder is retracted. Therefore, when designing a built-in sensor with a long stroke, it is necessary to design a protection device to avoid this problem. Conventional sensor protection The device is only suitable for hydraulic cylinders with a stroke of less than ...

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Problems solved by technology

[0002] The built-in sensor of a general hydraulic cylinder is installed with a magnetostrictive displacement sensor, which is a slender rod structure with an electronic head and a waveguide rod; when the stroke of the hydraulic cylinder is less than 3 meters, the displacement sensor can be directly installed on the cylinder without a protective device. Inside, but when it is greater than 3 meters, the slender rod of the sensor will sag under the action of gravity and will be bent when the hydraulic cylinder is retracted. Therefore, when designing a built-in sensor with a long stroke, it is necessary to design a protection device to avoid this problem. Conventional sensor protection The device is only suitable for hydraulic cylinders with a stroke of less than 7 meters. If the stroke is greater than 7 meters, even if the protection device is added, it is difficult to avoid the problem that the casing of the protection device will sag and cause damage to the sensor. This design is aimed at 7 meters. An effective solution proposed by the built-in sensor of the above ultra-long-stroke hydraulic cylinder is suitable for applications requiring ultra-long-stroke hydraulic cylinders such as hydropower gates, roll-changing cylinders, and oil drilling platforms. The existing ultra-long-stroke hydraulic cylinder has built-in sensors Most of the protection devices are of single-piston structure, that is, the piston connected to the hydraulic cylinder itself and the piston rod. Inside the piston rod, the casing of the built-in sensor of the hydraulic cylinder is supported by the inner piston, the piston rod is supported by the piston, and the piston is supported by the inner wall of the cylinder, so as to provide a support for the built-in sensor of the hydraulic cylinder inside the cylinder point

[0003] The above scheme has defects: when the stroke of the hydraulic cylinder is large, the length of the sleeve of the corresponding hydraulic cylinder sensor will also be very long. If the piston rod is fully extended, the hydraulic cylinder with a single piston structure can only be connected to the sleeve of the hydraulic cylinder with a built-in sensor. The first and last ends of the pipe provide support for it, and because the casing of the built-in sensor of the hydraulic cylinder is long and the suspended section of the casing is heavy, the end of the casing is easy to sag. The telescopic displacement sensor will be bent along with the casing when the hydraulic cylinder is retracted, so the sagging of the casing of the protection device will cause damage to the sensor

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