Self-controlled pump and standard force-measuring device adopting the self-controlled pump
A transmission device and frame technology, applied in the direction of measuring device, measuring fluid pressure, force/torque/work measuring instrument calibration/test, etc. The effect of overcoming instability problems
Inactive Publication Date: 2009-09-23
谢显奇
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Problems solved by technology
Although hydraulic loading can apply any force value, it cannot maintain stability after the load is added, and the force value will change soon, and it is difficult to maintain high stability (above 0.03%) for a short period of time such as a few tenths of a second.
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Embodiment Construction
[0020] In the standard force measurement technology using hydraulic pressure, the stability of hydraulic loading is a technical key. The reason why hydraulic loading is difficult to stabilize is generally considered to be caused by leakage of the hydraulic system. Through experimental observation and theoretical analysis, the following conclusions are drawn: in the case of better sealing, it is not caused by leakage, but by the performance of the hydraulic medium itself, that is, the change of performance parameters. Specifically: when loading, as the pressure of the medium increases, its temperature also increases; after the loading stops and the system is closed, the temperature of the medium in the hydraulic cylinder is higher than the external temperature, and it must release heat to the outside to make its temperature drop . As the temperature of the medium decreases, its volume will shrink, and at this time the medium is in a closed system, and the volume of the system r...
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The self-control pump provided by the invention includes a frame, a plunger cylinder, a ball screw transmission device, a harmonic reducer and a servo motor. The transmission input end of the ball screw transmission device is connected with the output end of the harmonic reducer, the transmission output end is connected with the upper end of the piston rod, and the input end of the harmonic reducer is connected with the output shaft of the servo motor. Its standard force measuring device includes a self-control pump, a computer, a pulse generator and a servo amplifier that load the master cylinder, the standard sensor and the sensor under test in series. , to achieve accurate volume compensation, overcome the problem of unstable hydraulic loading, and embody the loading control of the self-controlled pump in a high-accuracy, high-stability closed-loop control system, becoming a new and accurate standard force measuring device. The entire loading process is automatically completed by software through a computer, which has obvious advantages and positive effects.
Description
technical field [0001] The invention relates to a liquid pump and a metering force measuring calibration device, in particular to an automatic control pump and a standard force measuring device using the automatic control pump. Background technique [0002] In the field of hydraulic technology and measurement force measurement technology, the hydraulic loading method of applying load to a given object by pressurizing the medium of the hydraulic cylinder to make the piston generate force is widely used. The hydraulic loading is stepless adjustable, the applied load is stable without impact, the load range is wide, the device is small in size and light in weight, which has very important practical significance for the measurement force measurement technology. However, the metrological force measurement technology requires high accuracy of the force value (such as 0.03% to 0.01% or higher), and requires the force value to be stable. Although hydraulic loading can apply any for...
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IPC IPC(8): F04B49/06F04B49/08G01L25/00G01L27/00
Inventor 谢显奇
Owner 谢显奇