Checking tool for rotary displacement sensor

Abstract

The utility model discloses a verification tool for a rotary displacement sensor. The verification tool comprises a base, a supporting seat, a bearing assembly, a positioning rod, a screw seat, a rotary screw, a dial indicator and a gauge stand. The supporting seat, the screw rod seat and the gauge stand are sequentially arranged on the base, the rotating screw rod is arranged on the screw rod seat in a penetrating mode, one end of the rotating screw rod is connected with the bearing assembly, and the other end of the rotating screw rod is provided with a measuring end face; the positioning rod is located below the rotating screw rod, one end of the positioning rod is connected with the bearing assembly, and the other end of the positioning rod is arranged on the screw rod base in a penetrating mode; the dial indicator is installed on the gauge stand. One end of the measured displacement sensor is connected with the supporting seat, and the other end of the measured displacement sensor is connected with the bearing assembly. The zero position adjusting device has the advantages of being compact in structure, convenient to operate, high in adjusting flexibility and the like, achieves zero position adjustment of the displacement sensor under simple conditions, and is suitable for external field detection and fault positioning work of the sensor.

Description

Technical Field

[0001] This utility model belongs to the field of displacement sensor zeroing and measurement technology, specifically relating to a calibration fixture for a rotary displacement sensor. Background Technology

[0002] A rotary displacement sensor is a dual conductive plastic potentiometer. When the lever pulls the slider, the brushes and resistive components on it are displaced, and the output voltage is a linear function of the displacement.

[0003] Because rotary displacement sensors are characterized by high measurement sensitivity and high resolution, the axial installation clearance of the sensor is required to be high during actual installation. If the axial working clearance is too large or rotation occurs during the measurement process, it will directly lead to large deviations in the measurement results and incomplete zero-point calibration.

[0004] Existing rotary displacement sensor measurement equipment is mostly used in medium to large-scale automated electrical equipment, employing high-precision grating displacement measurement devices. Grating displacement measurement devices are primarily used in factories or laboratories, and due to their high cost, they are rarely used in simple field environments or battlefield repair scenarios. Furthermore, sensor zero-point adjustment requires additional specialized tooling, increasing usage costs and making operation more cumbersome. Utility Model Content

[0005] The technical problem this invention aims to solve is to provide a calibration fixture for a rotary displacement sensor that is compact, easy to operate, and highly reliable, addressing the shortcomings of existing technologies. To achieve the above objective, this invention can adopt the following technical solution:

[0006] A calibration fixture for a rotary displacement sensor includes: a base, a support, a bearing assembly, a positioning rod, a screw seat, a rotating screw, a dial indicator, and a dial indicator base. The support, screw seat, and dial indicator base are sequentially arranged on the base. The rotating screw passes through the screw seat, with one end connected to the bearing assembly and the other end having a measuring end face. The positioning rod is located below the rotating screw, with one end connected to the bearing assembly and the other end passing through the screw seat. The dial indicator is mounted on the dial indicator base. One end of the displacement sensor being measured is connected to the support, and the other end is connected to the bearing assembly.

[0007] As a further improvement of this utility model, the bearing assembly includes a bearing housing and a bearing, wherein the outer ring of the bearing is installed in the bearing housing by an interference fit, and the inner ring of the bearing is interference fitted with the boss of the rotating screw.

[0008] As a further improvement of this utility model, one end of the positioning rod is threadedly connected to the connecting lug at the bottom of the bearing seat.

[0009] As a further improvement of this utility model, the screw seat is provided with a through hole for the positioning rod to pass through.

[0010] As a further improvement of this utility model, the dial indicator probes make vertical contact with the measuring end face.

[0011] As a further improvement of this utility model, the watch base is a magnetic watch base.

[0012] Compared with the prior art, the advantages of this utility model are:

[0013] This utility model discloses a calibration fixture for a rotary displacement sensor. A support base, a screw base, and a dial indicator base are sequentially arranged on a base. A rotating screw is inserted through the screw base, with one end connected to a bearing assembly and the other end having a measuring end face that works in conjunction with a dial indicator. This forms a compact and small-sized calibration fixture. One end of the displacement sensor under test is connected to the support base, and the other end is connected to the bearing assembly, thus achieving the installation and fixation of the displacement sensor on the calibration fixture. Simultaneously, a positioning rod is provided below the rotating screw. One end of the positioning rod is connected to the bearing assembly, and the other end is inserted through the screw base. By rotating the screw, the positioning rod is zeroed, achieving mechanical zeroing of the displacement sensor under simple conditions. By connecting the displacement sensor to an external regulated power supply and a multimeter, the linear change of the rotary displacement sensor can be measured relatively accurately. This fixture is suitable for field testing and fault location of rotary displacement sensors and can adapt to harsh conditions such as battlefield repairs. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structural principle of the calibration fixture for the rotary displacement sensor in a specific embodiment of this utility model;

[0015] Figure 2 This is a schematic diagram illustrating the measurement principle of the rotary displacement sensor in a specific embodiment of this utility model;

[0016] Legend: 1. Base; 2. Support base; 3. Displacement sensor under test; 4. Bearing housing; 5. Bearing; 6. Positioning rod; 7. Screw seat; 8. Rotating screw; 9. Measuring end face; 10. Dial indicator; 11. Indicator base; 12. Connecting lug; 13. Through hole. Detailed Implementation

[0017] The present invention will be further described below with reference to the accompanying drawings and specific preferred embodiments, but this does not limit the scope of protection of the present invention.

[0018] In the description of this utility model, it should be understood that the terms "side", "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0019] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "multiple" means two or more, unless otherwise explicitly specified.

[0020] Example

[0021] like Figure 1 As shown, the calibration fixture for the rotary displacement sensor of this utility model includes: a base 1, a support 2, a bearing assembly, a positioning rod 6, a screw seat 7, a rotating screw 8, a dial indicator 10, and a dial indicator base 11. The support 2, screw seat 7, and dial indicator base 11 are sequentially arranged on the base 1. The rotating screw 8 is threaded onto the screw seat 7, with one end connected to the bearing assembly and the other end having a measuring end face 9. The positioning rod 6 has a zero-position mark (not shown in the figure) and is located below the rotating screw 8. One end of the positioning rod 6 is connected to the bearing assembly, and the other end is threaded onto the screw seat 7. The dial indicator 10 is mounted on the dial indicator base 11. One end of the displacement sensor 3 is fixed to the top of the support 2 by a screw and a nut, and the other end is connected to the bearing assembly by a screw and a nut. It should be noted that the displacement sensor 3 in this embodiment is a component of the aircraft foot pedal assembly and is used to control the aircraft's ground turning.

[0022] In this embodiment, the support base 2, screw base 7, and dial indicator base 11 are sequentially arranged on the base 1, and the rotating screw 8 is inserted through the screw base 7. One end of the rotating screw 8 is connected to the bearing assembly, and the other end is provided with a measuring end face 9, which cooperates with the dial indicator 10, thus forming a compact and small-sized calibration fixture. One end of the displacement sensor 3 under test is connected to the support base 2, and the other end is connected to the bearing assembly, thus realizing the installation and fixation of the displacement sensor 3 under test on the calibration fixture. At the same time, a positioning rod 6 is also set below the rotating screw 8. One end of the positioning rod 6 is connected to the bearing assembly, and the other end is inserted through the screw base 7. By rotating the screw 8, the positioning rod 6 is driven to zero, thus realizing the mechanical zeroing of the displacement sensor 3 under simple conditions. By connecting the displacement sensor 3 under test to an external regulated power supply and a multimeter, the linear change of the rotary displacement sensor can be measured relatively accurately, which is suitable for field testing and fault location of rotary displacement sensors. No separate zero-point calibration fixture is required, and the zeroing of the sensor can be easily performed. The zeroing and measurement work are combined into one fixture, which can adapt to harsh conditions such as battlefield repair.

[0023] like Figure 1 As shown, the bearing assembly includes a bearing housing 4 and a bearing 5. The outer ring of the bearing 5 is installed in the bearing housing 4 with an interference fit, and the inner ring of the bearing 5 is interference fitted with the boss at the end of the rotating screw 8, thus realizing the installation and fixation of the bearing assembly.

[0024] Due to the requirements of aircraft use, the rotary displacement sensor is designed to be rotatable as a whole, and a spherical bearing is also installed at the connection point with the aircraft. When it is necessary to accurately measure the linear change curve of the output voltage value of the rotary displacement sensor, it is necessary to ensure the stable change of its displacement. Therefore, the following method is adopted: the displacement sensor 3 under test is reliably connected to the calibration fixture through the support seat 2 and the bearing seat 4, and displacement only occurs in the axial direction; after the rotating screw 8 is connected to the bearing seat 4 through the bearing 5, the displacement sensor 3 under test can be stably displaced; with the assistance of the positioning rod 6, it is ensured that the bearing seat 4 and the displacement sensor 3 under test will not rotate.

[0025] In this embodiment, one end of the positioning rod 6 is provided with an external thread, and the other end of the positioning rod 6 is a light shaft. The threaded end of the positioning rod 6 is threadedly connected to the connecting lug 12 at the bottom of the bearing seat 4 and locked by a nut. The screw seat 7 is provided with a through hole 14 for the light shaft of the positioning rod 6 to pass through.

[0026] In this embodiment, the axial displacement measurement method of the displacement sensor 3 is purely mechanical, which has high reliability and stability. The transmission structure composed of the rotating screw 8, bearing seat 4, bearing 5, positioning rod 6 and screw seat 7 realizes the conversion of helical motion into longitudinal motion, and through high-precision bearings and threaded structure, it can achieve the output of minute displacement (0.01mm accuracy of dial indicator).

[0027] In this embodiment, the dial indicator 11 is a magnetic dial indicator, which is attracted to the base 1 by magnetic force. The probes of the dial indicator 10 are in vertical contact with the measuring end face 9, and the displacement of the rotating screw 8 is directly read by the dial indicator 10, which is the displacement of the displacement sensor 3 being measured.

[0028] like Figure 1 and Figure 2 As shown, when using the displacement sensor 3 to perform the measurement, an external regulated power supply and a multimeter are connected to the displacement sensor 3.

[0029] Preparation before measurement: Securely connect the displacement sensor 3 to the support base 2 and bearing seat 4 using bolts and nuts, and install the dial indicator 10 into the base 11. Supply DC voltage to the displacement sensor 3 through a regulated power supply, and connect the output terminal of the displacement sensor 3 to the multimeter.

[0030] Zero-position adjustment: Twist the rotating screw 8 until the zero position of the positioning rod 6 is flush with the vertical plane on the left side of the screw seat 7, so that the displacement sensor 3 under test is in the mechanical zero position. At this time, by turning the adjusting rod on the displacement sensor 3 under test, the output voltage of the displacement sensor 3 under test is made to the zero-position voltage value. In this way, the zero position of the displacement sensor 3 under test is adjusted.

[0031] Voltage linearity measurement: With the dial indicator 10 at zero position, zero the dial indicator 10. Twist the rotating screw 8 to move the displacement sensor 3 to the left and right in the axial direction, and measure the voltage value at the corresponding measurement point (every 1 mm, with an accuracy of 0.01 mm). Finally, the output voltage linearity is calculated.

[0032] While the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make many possible variations and modifications to the technical solutions of the present invention, or modify them into equivalent embodiments, without departing from the spirit and technical essence of the present invention. Therefore, any simple modifications, equivalent substitutions, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention, without departing from the content of the technical solutions of the present invention, shall still fall within the protection scope of the present invention.

Claims

1. A calibration fixture for a rotary displacement sensor, characterized in that, include: The base (1), support seat (2), bearing assembly, positioning rod (6), screw seat (7), rotating screw (8), dial indicator (10) and gauge seat (11) are arranged sequentially on the base (1). The rotating screw (8) passes through the screw seat (7), one end of the rotating screw (8) is connected to the bearing assembly, and the other end of the rotating screw (8) is provided with a measuring end face (9). The positioning rod (6) is located below the rotating screw (8). One end of the positioning rod (6) is connected to the bearing assembly, and the other end of the positioning rod (6) passes through the screw seat (7). The dial indicator (10) is installed on the gauge seat (11). One end of the displacement sensor (3) is connected to the support seat (2), and the other end of the displacement sensor (3) is connected to the bearing assembly.

2. The calibration fixture for the rotary displacement sensor according to claim 1, characterized in that, The bearing assembly includes a bearing housing (4) and a bearing (5). The outer ring of the bearing (5) is installed in the bearing housing (4) by interference fit, and the inner ring of the bearing (5) is interference fit with the boss of the rotating screw (8).

3. The calibration fixture for the rotary displacement sensor according to claim 2, characterized in that, One end of the positioning rod (6) is threadedly connected to the connecting lug (12) at the bottom of the bearing seat (4).

4. The calibration fixture for the rotary displacement sensor according to any one of claims 1 to 3, characterized in that, The screw seat (7) is provided with a through hole (13) for the positioning rod (6) to pass through.

5. The calibration fixture for the rotary displacement sensor according to any one of claims 1 to 3, characterized in that, The probes of the dial indicator (10) make perpendicular contact with the measuring end face (9).

6. The calibration fixture for the rotary displacement sensor according to any one of claims 1 to 3, characterized in that, The base (11) is a magnetic base.

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