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Negative step force testing system

A negative step force, test system technology, applied in the direction of force/torque/work measuring instrument calibration/testing, force/torque/work measuring instrument, measuring device, etc. The problem is not large, the static load is limited, etc., to achieve the effect of adjustable falling edge time, large initial force, and short falling edge time

Inactive Publication Date: 2014-04-16
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this negative step force source system has the following disadvantages: 1. The unloading part is usually a brittle material that is easy to break, so the pressing force F generated by the force applying part 0 It must be within the range that the unloading parts can bear, that is, the initial static load is limited, and the initial force is not large
2. The unloading method adopts the method of breaking the brittle material due to the impact of the falling hammer, and it is difficult to ensure a short falling time.
3. Due to the effect of the pad, the falling edge time of the force actually acting on the force sensor is longer than the material fracture time, and the falling edge time cannot be adjusted

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] refer to Figure 1-3

[0035] The negative step force test system includes the device under test 1, the force sensor 2 fixed on the device under test 1 and the negative step force generating device that applies force to the device under test 1; the negative step force generating device includes a pressure cylinder 3. The pressure control circuit connected to the pressure cylinder 3, the pressure piston 33 that separates the inner chamber of the pressure cylinder into the first pressure chamber 31 and the second pressure chamber 32, the piston rod 34 fixedly connected with the pressure piston 33, and the pressure piston 34 that is set at the pressure The unloading port 35 on the cylinder 3, and the unloading valve 4 that is adapted to the unloading port 35 and can quickly open the unloading port 35;

[0036] The unloading port 35 is set in the first pressure chamber 31, the piston rod 34 passes through the second pressure chamber 32, the exposed end of the piston rod 34...

Embodiment 2

[0053] refer to Figure 4

[0054] The difference between this embodiment and the first embodiment is that an unloading valve seat 48 is added between the pressure cylinder 3 and the valve body mounting seat 42 of the unloading valve 4 to limit the flow of the working medium of the pressure cylinder 3 . All the other structures are the same as the first embodiment.

[0055] Specifically, the unloading valve 4 also includes an unloading valve seat 48, the unloading valve seat 48 is arranged between the pressure cylinder 3 and the valve body mounting seat 42, the unloading valve seat 48 is hollow and fixedly connected with the pressure cylinder 3, The unloading valve seat 48 , the valve body mounting seat 42 and the pressure cylinder 3 form an unloading chamber 4E, and the unloading chamber 4E has a pressure discharge port 481 communicating with the outside. When the pressure cylinder 3 is a pneumatic cylinder, a second muffler X2 is arranged on the pressure discharge port.

...

Embodiment 3

[0058] refer to Figure 5

[0059] The difference between the present embodiment and the second embodiment is that the first pressure chamber 31 is provided with a boss 311 extending toward the direction of the pressure piston 33, and there is a gap between the boss 311 and the pressure cylinder 3, and the gap communicates with the pressure control circuit And pressure relief port 35. All the other structures are the same as the second embodiment.

[0060] The technical idea of ​​this embodiment is to reduce the volume of the first pressure chamber 31 by setting a boss. The smaller the volume of the first pressure chamber 31 is, the shorter the required unloading time is. The shorter the unloading time, the faster the pressure in the first pressure chamber 31 drops, and the faster the output thrust of the pressure piston 33 drops; at the same time, the pressure piston 33 moves rapidly to the left under the pressure in the second pressure chamber 32, which is consistent with...

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Abstract

A negative step force testing system comprises a device under test, a force sensor fixed on the device under test and a negative step force generating device for applying acting force on the device under test. The negative step force generating device comprises a pressure cylinder, a pressure control loop, a pressure piston, a piston rod, an unloading port and a unloading valve, wherein the pressure control loop is connected with the pressure cylinder, the pressure piston divides the cavity in the pressure cylinder into a first pressure cavity and a second pressure cavity, the piston rod is fixedly connected with the pressure piston, the unloading port is formed in the pressure cylinder, and the unloading valve is matched with the unloading port to open or close the unloading port. The unloading port is arranged in the pressure cavity, the piston rod penetrates through the second pressure cavity, the exposed end of the piston rod pushes the device under test, the force sensor senses pressure between the piston rod and the device under test, and the pressure control loop controls the pressure generated when the piston rod pushes the device under test. The negative step force testing system has the advantage of being accurate in initial force, large in initial acting force and adjustable in falling edge time of force.

Description

technical field [0001] The invention relates to a negative step force test system. Background technique [0002] The launch of the satellite and the transformation of the space orientation are controlled by controlling the ignition time and direction of the engine. Before applying an engine, it is necessary to use a sensor test system to carry out a large number of detection tests to accurately measure the thrust of the engine and test the performance of the engine. In the development process of the sensor test system, it is necessary to carry out technical verification, and at the same time, it is also necessary to carry out performance retest during use or after storage, which is called calibration or calibration. The essence of calibration and calibration is to use standard instruments to calibrate the sensor on the premise of clarifying the relationship between the output and input of the sensor. Sensor test system calibration can be divided into static calibration and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L25/00G01L5/00
Inventor 何闻李劲林陈群荣左超贾叔仕庹青林
Owner ZHEJIANG UNIV
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