RU2510487C1 - Device for calibration of inching transducer - Google Patents

Abstract

FIELD: instrumentation.

SUBSTANCE: proposed device comprises the base frame, post, movable and stationary measuring rods and measuring means composed by indicator of multiturn and/or holographic length meter. In compliance with this invention, said base frame has the screw to interact with pusher wedge spring-loaded by horizontal spring. Spring-loaded vertical measuring rod thrusts against said pusher wedge to be displaced inside stationary measuring rod by said wedge. Post is secured at said base frame to accommodate aforesaid multiturn and/or holographic length meter aligned with said movable and stationary measuring rods and connected with electronic unit. Inching transducer to be calibrated is secured at said movable and stationary measuring rods.

EFFECT: higher quality of measurements, friendly design.

1 dwg

Description

The invention relates to measuring technique, namely to exemplary measuring instruments intended for verification of small displacement measurement sensors used in tensile or compression tests of samples, including fissile materials (DM) under glove box conditions.

Mechanical tests of DM samples are carried out in a glove box in order to protect personnel and the environment from the effects of the tested materials. This feature imposes additional requirements, including the convenience of work on equipment and devices used in tests in the box space.

Known vertical type strain gauge for testing strain gauges using a pair of "micrometer-micrometer screw" to convert the rotational motion of the drum of the reading device into the translational motion of the measuring rod [Strain gauge, RF package No. 1580145 with priority from 08.08.88, publ. 07.23.90, G01B 5/30]. The disadvantage of this strain gauge is the lack of measurement accuracy, which is determined by the low resolution of the reading device (division value 0.01 mm).

Closest to the proposed device is a vertical type strain gauge for checking strain gauges, also using a pair of "micrometer-micrometer screw" to convert the rotational motion of the drum of the reading device into the translational motion of the measuring rod [Strain gauge, RF package No. 34243, publ. November 27, 2003, G01B 5/30], and in which, along with a reading device in the form of a micrometer head, a digital reading device is used: a linear displacement transducer with a holographic measuring element [State Register of Measuring Instruments of the Russian Federation No. 21869-01, VNIIMS, M.]. The disadvantage of this strain gauge is the lack of measurement accuracy due to the fact that the movable and stationary measuring rods, as well as the micrometer head are installed in various elements of the housing, which lengthens the power chain through which the movement is transmitted. In addition, for the convenience of working with the calibrator in the glove box, a horizontal arrangement of the movement-determining device is preferable.

The strain gauge according to the patent of the Russian Federation No. 34243 is selected as a prototype.

The challenge facing the authors of the present invention is the development of a horizontal type device for calibrating sensors measuring small displacements, which allows to improve the quality of measurements in a glove box. By the quality of measurements is meant a set of properties that determine the receipt of a result with the required accuracy characteristics in the required form and on time. The quality of measurements is characterized by such indicators as accuracy, correctness and reliability [Sergeev A.G., Latyshev M.V., Teregerya V.V. Metrology, Standardization, Certification: Textbook. - M .: Logos, 2003, 536 p.].

The technical result of this technical solution is to improve the quality of measuring small displacements during the calibration of sensors for measuring small displacements and creating a calibrator design for convenient operation in the glove box.

The technical result is achieved by the fact that in a device for calibrating sensors for measuring small displacements, containing a base, a rack, a movable and fixed measuring rods, measuring devices in the form of an indicator of multi-turn and / or holographic length meters, according to the invention, a screw is placed in the base interacting with a pushing wedge, a horizontal spring, on an inclined surface of which a spring-loaded movable measuring rod is supported, which can be moved inside the stationary measuring rod by means of a pushing wedge, a stand is fixed on the base, on which a multi-turn and / or holographic long-length indicator connected to the electronic unit is coaxial with the movable and stationary measuring rods, and the calibrated sensor for measuring small displacements is mounted on the moving and fixed measuring rods .

In order to improve the calibration accuracy, the screw pushing the wedge, the horizontal spring, the vertical spring, the movable and fixed measuring rods are installed in one base and are made of the same material.

To increase the ergonomic characteristics of the device when working in the confined space of the glove box, the base and the screw interacting with the pushing wedge are located horizontally.

Figure 1 shows a diagram of a device for calibrating sensors measuring small displacements in a glove box (not shown in figure 1), where:

1 - screw;

2 - pushing wedge;

3 - base;

4 - horizontal spring;

5 - vertical spring;

6 - fixed measuring rod;

7 - sensor for measuring small displacements;

8 - movable measuring rod;

9 - holographic length meter;

10 - a rack;

11 - multi-turn indicator;

12 - electronic unit.

The device operates as follows. A screw 1, a pushing wedge 2, a movable rod 8, a fixed rod 6, a horizontal spring 4 and a vertical spring 5 are placed in a massive base 3 to which the column 10 is attached. A holographic length gauge 9 is placed coaxially with the stationary rod 6 and the movable rod 8. connected to the electronic unit 12, and the indicator is multi-turn 11. A calibrated sensor for measuring small displacements 7, consisting of two coils, is mounted on a movable measuring rod 8 and a stationary measuring rod 6. When rotating the screw 1 I push The moving wedge 2 moves horizontally and drives the movable rod 8, moving vertically inside the stationary rod 6. The movement of the sensor for measuring small displacements 7 can be measured using a multi-turn indicator 11 with a division price of 1 μm (1 MIG GOST 9696-75 ), and by means of a holographic length meter 9 or both together and an electronic unit 12 with an accuracy of ± 0.2 μm [State Register of Measuring Instruments of the Russian Federation No. 21869-01, VNIIMS, M.]. At the same time, using the recording equipment (not shown in FIG. 1), an electrical signal is recorded from the sensor for measuring small displacements 7. For the movement of the sensor for measuring small displacements 7 in the opposite direction, screw 1 is rotated in the opposite direction, while the pushing wedge 2 under the action of a horizontal spring 4 and the movable rod 8 under the action of the vertical spring 5 also move in the opposite direction.

Thanks to the claimed combination of features of the solution, it becomes possible to improve the quality of measuring small displacements, as well as facilitate the removal of calibration dependencies in the glove box.

Claims (1)

A device for calibrating a sensor for measuring small displacements, containing a base, a stand, a movable and fixed measuring rods, measuring devices in the form of an indicator of a multi-turn and / or holographic length meter, characterized in that a screw is located at the base, interacting with a pushing wedge, pressed by a horizontal spring, on the inclined surface of which is supported by a spring-loaded vertical movable measuring rod having the ability to move inside a stationary measuring st a rod by means of a pushing wedge, a base is fixed on the base, on which a multi-turn and / or holographic long-length indicator connected to the electronic unit is coaxially with the movable and stationary measuring rods, and the calibrated sensor for measuring small displacements is mounted on the movable and stationary measuring rods.