Hydraulic system indirect measurement temperature pressure compensating device

Abstract

The invention relates to a hydraulic system indirect measurement temperature pressure compensating device, mainly used for improving measurement accuracy. In the technical scheme, the device is provided with a three-position six-way valve; the three-position six-way valve is respectively connected with a hydraulic executive element, an electromagnetic valve and a valve position indicator; when the electricity of the electromagnetic valve is cut off, the three-position six-way valve is at the middle position, all oil ways are cut off, and two working chambers of the hydraulic executive element are at an oil return end; one side of the electromagnetic valve is energized, the three-position six-way valve shifts right, and one working chamber of the hydraulic executive element is at the low pressure and gets connected with the valve position indicator to form a first measurement loop; and when the other side of the electromagnetic valve is energized, a valve plug of the three-position six-way valve shifts left, the other working chamber of the hydraulic executive element is at low pressure and gets connected with the valve position indicator to form a second measurement loop. The device is suitable for all types of hydraulic system indirect measurement devices.

Description

Technical field: [0001] The invention relates to a measurement of a hydraulic system, in particular to a measurement compensation of a hydraulic system. Background technique: [0002] In the remote control valve hydraulic system, in many occasions, it is necessary to remotely measure the motion state of hydraulic cylinders and other actuators, such as displacement (measurement of linear dimensions), etc., especially in order to accurately monitor the work of the valve, the existing measurement technology has the following two plan: [0003] 1. Direct measurement method 1 is a more intuitive measurement method. Usually, the displacement of the actuator or the corresponding calibrated position can be read by adding measuring devices such as potentiometers and electromagnetic sensors to the actuator. However, when the actuator needs to If it is installed in an explosion-proof environment or in a submerged place with a relatively harsh environment, the above-mentioned live meas...

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Problems solved by technology

[0003] 1. Direct measurement method 1 is a more intuitive measurement method. Usually, the displacement of the actuator or the corresponding calibrated position can be read by adding measuring devices such as potentiometers and electromagnetic sensors to the actuator. However, when the actuator needs to If it is installed in an explosion-proof environment or in a submerged place with a relatively harsh environment, the above-mentioned live measuring devices cannot be directly installed on the actuator. If explosion-proof products are used to adapt to these environmental conditions, and these products are expensive, users will be frustrated. Burden, therefore, direct measurement methods are difficult to implement in the above-mentioned environments that may be frequently encountered;

[0004] 2. Indirect measurement method - is a common technical measure for monitoring the position of the actuator in the hydraulic system. This method is to measure the volume of hydraulic oil flowing through the hydraulic actuator, and then convert the hydraulic actuator from the measured oil volume value. The position (or displacement) of the hydraulic oil volume of the actuator measured above includes both the oil in its high-pressure chamber and the oil in its low-pressure chamber. The most common measuring mechanisms such as metering motors, metering cylinders or some other metering sensors use The indirect measurement method can overcome the defects caused by the above direct measurement, but the measurement accuracy of the indirect measurement method and the measuring instruments used is directly affected by the type of working oil, oil temperature, viscosity and other factors, and its measurement accuracy is low. At the same time, due to the complexity of the measurement oil circuit, the corresponding oil leakage points will also increase, which will not only increase the difficulty of measurement, but also further reduce the measurement accuracy

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