CN214620944U

CN214620944U - High-precision linear displacement sensor testing tool

Info

Publication number: CN214620944U
Application number: CN202022978150.3U
Authority: CN
Inventors: 俄嘉; 王培科; 宋延林; 姜军胜; 李成华
Original assignee: Lanzhou Flight Control Co Ltd
Current assignee: Lanzhou Flight Control Co Ltd
Priority date: 2020-12-11
Filing date: 2020-12-11
Publication date: 2021-11-05
Anticipated expiration: 2030-12-11

Abstract

The utility model relates to a high accuracy linear displacement sensor test fixture belongs to the test technology field. At present, all testing and checking tools use a grating ruler, a vernier caliper and the like as measuring tools, a motor is used as a driving device, displacement is not well controlled due to the fact that the motor is driven, and the measuring accuracy of the grating ruler and the vernier caliper is low, so that the testing requirement cannot be met. The utility model discloses high accuracy linear displacement sensor test fixture, this frock have sensor support and differential head support in the bottom plate upper end, install the sensor that awaits measuring on the sensor support, install the micro-minute head of number on the differential head support, the sensor core of sensor passes through the connecting rod and is connected with the coaxial of the micro-head core shaft of digital display. Simple structure, convenient operation, light weight, low cost and no special requirements on personnel, equipment and environment.

Description

High-precision linear displacement sensor testing tool

Technical Field

The utility model relates to a high accuracy linear displacement sensor test fixture belongs to the test technology field.

Background

In recent years, with the development of the aviation industry technology, the sensor technology is widely applied to many aspects of aircraft development, and the linear displacement sensor is used as a key means for acquiring information, and the accuracy of the linear displacement sensor directly influences the system performance and the test accuracy. At present, all testing and checking tools use a grating ruler, a vernier caliper and the like as measuring tools, a motor is used as a driving device, displacement is not well controlled due to the fact that the motor is driven, and the measuring accuracy of the grating ruler and the vernier caliper is low, so that the testing requirement cannot be met.

SUMMERY OF THE UTILITY MODEL

The utility model aims at: through the utility model discloses can make the LVDT sensor clamping fixed to accomplish LVDT sensor debugging and performance parameter test, fill the blank in this type of product frock test field.

The technical scheme of the utility model is that: a high-precision linear displacement sensor testing tool is characterized in that a sensor support and a differential head support are arranged at the upper end of a bottom plate, a sensor to be tested is mounted on the sensor support, a plurality of differential heads are mounted on the differential head support, and a sensor iron core of the sensor is coaxially connected with a digital display differential head core shaft through a connecting rod.

Advantageously, the connecting rod has a cylindrical cavity structure at the end connected with the digital display micro-head mandrel, and has an upper threaded hole and a lower threaded hole in the vertical direction, and a through hole inserted into the digital display micro-head mandrel in the axial direction, and the digital display micro-head mandrel is coaxially adjusted and clamped by an upper set screw and a lower set screw.

Advantageously, the sensor holder has a recess in the upper end in which the sensor is placed, and in the upper part of the sensor is a pressure plate with a recess in the lower end, the sensor being clamped between the sensor holder and the pressure plate by means of a fastening element.

Advantageously, the sensor holder is fixed to the base plate by screws; the differential head bracket is fixed on the bottom plate through a screw.

Advantageously, the digital display differential head is fixed relative to the differential head support by means of a nut.

Advantageously, a foot is also provided at the lower end of the bottom plate.

Advantageously, the digital display differential head further comprises a self-locking device and a ratchet wheel, the protruding length of the core shaft of the digital display differential head is adjusted by the ratchet wheel, and the digital display differential head is locked by the ratchet wheel.

Advantageously, the protruding length of the several-micrometer split mandrel is displayed by a liquid crystal screen.

When in measurement, the ratchet wheel of the number micro-counting head is rotated, the core shaft of the number micro-counting head drags the iron core to extend and retract, the numerical value is displayed by the liquid crystal screen to be read, and the numerical value can also be directly read through the scale mark of the number micro-counting head, so that the accurate measurement of the displacement of the number micro-counting head is realized; the micro-head mandrel can be guaranteed to be in a stop state through the self-locking device for rotating the micro-heads, and the function of locking the LVDT sensor iron core at any position can be realized.

The utility model has the advantages that: simple structure, convenient operation, light weight, low cost and no special requirements on personnel, equipment and environment.

Drawings

FIG. 1 is a schematic structural view of the testing tool of the present invention;

FIG. 2 is a schematic view of the connecting rod assembly;

fig. 3 is a schematic view of the clamping of the linear displacement sensor.

Detailed Description

The present invention will be described in further detail below. Referring to fig. 1, 2 and 3, the tool is composed of a base, a sensor mounting part and a testing part. The base is composed of supporting legs 11 and a bottom plate 12, the four supporting legs 11 are provided with threads and are arranged on the bottom plate 12 through threaded holes of the bottom plate, and the level of the device is adjusted by rotating each supporting leg; the sensor bracket 1 and the differential head bracket 9 are respectively fixed on a bottom plate 12 by

screws

2 and 10; the sensor mounting part consists of a sensor bracket 1, a pressing plate 3 fastening piece 5 and a measured sensor 4, the sensor shell is fixed in the groove by the sensor 1, and the pressing plate 3 is fixedly mounted by the groove matched with the bracket through a screw 5; the testing part consists of a plurality of micro heads 8 and a micro head bracket 9; the number of the micro-minute heads are arranged on a micro-minute head support 9 through nuts 8b, referring to fig. 2, one end of a connecting rod 6 is in threaded connection with a sensor iron core 4a, and a sleeve structure at the other end is connected with a number of the micro-minute head core shafts 8a and is fixed by a set screw 7, so that the sensor iron core and the number of the micro-minute head core shafts are coaxial, and the sensor iron core 4a is enabled to be free of contact with the shell of the sensor when extending out and retracting relative movement occurs in the shell of the sensor. When in measurement, the ratchet wheel 8d of the number of the microscopic taps is rotated, the core shaft 8a of the number of the microscopic taps drags the iron core of the sensor to extend and retract, the numerical value can be directly read through the display of the liquid crystal screen 8c, and the numerical value can also be directly read through the scale marks, so that the accurate measurement of the displacement of the numerical value is realized; the self-locking device 8e capable of rotating the number of the micro-taps can ensure that the micro-taps mandrel is in a stop state, and the function of locking the sensor core at any position is realized. Adopt the utility model discloses back easy operation, measured data is true reliable, and is efficient.

The connecting rod is connected with the sensor core and the central spindle 8a of the digital microscope head, the threaded end needs to retract into the sensor shell along with the sensor core, the structure and the overall dimension need to be determined according to the structure of a sensor to be tested, and the material of the connecting rod has an antimagnetic function, so that the beryllium bronze is selected for use to realize the test requirement. The utility model discloses a theory of operation is: referring to fig. 1, a sensor to be measured is arranged on a sensor support 1 through a screw 5 and a pressing plate 3, one end of a connecting rod 6 is in threaded connection with a sensor iron core 4a, the other end of the connecting rod is connected with a digital display differential head core shaft 8a, and the coaxiality of the two ends of the connecting rod connected is ensured by adjusting a set screw 7 and a fine adjustment differential head core shaft. Then cooperate the sensor to lead to the electrical tester, for the sensor to lead to the electrical zero position, then set the digital display differential head LCD screen to zero, through rotating the ratchet wheel 8e of the digital microscope head, the core shaft 8a of the digital microscope head drags the sensor core 4a to extend and retract, when the sensor core 4a needs to be locked, the self-locking device 8d of the rotatable digital microscope head can ensure that the differential head core shaft is in a stop state, thus realizing the function of locking the sensor core at any position. Thereby finishing the gradient and precision test of the sensor and finishing the debugging work of the sensor.

Claims

1. The utility model provides a high accuracy linear displacement sensor test fixture which characterized in that: the tool is provided with a sensor support (1) and a differential head support (9) at the upper end of a bottom plate (12), a sensor (4) to be detected is installed on the sensor support (1), a number of micro-taps (8) are installed on the differential head support (9), and a sensor iron core (4a) of the sensor (4) is coaxially connected with a number of micro-taps mandrel (8a) through a connecting rod (6).

2. The high-precision linear displacement sensor testing tool according to claim 1, characterized in that: the connecting rod (6) is provided with a cylindrical cavity structure at the end part connected with the micro-split core shaft (8a), an upper threaded hole and a lower threaded hole in the vertical direction, a through hole inserted into the micro-split core shaft (8a) is formed in the axial direction, and the micro-split core shaft (8a) is coaxially adjusted and clamped through a fastening screw (7) at the upper part and a fastening screw (7) at the lower part.

3. The high-precision linear displacement sensor testing tool according to claim 1, characterized in that: the sensor support (1) is provided with a groove at the upper end, a sensor (4) is placed in the groove, a pressing plate (3) with a groove at the lower end is arranged at the upper part of the sensor (4), and the sensor (4) is clamped between the sensor support (1) and the pressing plate (3) through a fastener (5).

4. The high-precision linear displacement sensor testing tool according to claim 1, characterized in that: the number of the micro-taps (8) are fixed relative to the micro-tap holder (9) by nuts (8 b).

5. The high-precision linear displacement sensor testing tool according to claim 1, characterized in that: the lower end of the bottom plate (12) is also provided with a supporting leg (11).

6. The high-precision linear displacement sensor testing tool according to claim 1, characterized in that: the number microscopic head (8) also comprises a self-locking device (8d) and a ratchet wheel (8e), the extension length of the mandrel (8a) of the number microscopic head is adjusted by the ratchet wheel (8e), and the ratchet wheel (8e) locks the mandrel.

7. The high-precision linear displacement sensor testing tool according to claim 6, characterized in that: the extending length of the micro-split mandrel (8a) is displayed through a liquid crystal screen (8 c).