Lever type displacement sensor

Abstract

The utility model discloses a lever type displacement sensor comprising an elastic body which is provided with two spaced and parallel deformation parts. Wherein one deformation part is provided with an inductance coil, the other deformation part is in threaded connection with an adjusting nail corresponding to the inductance coil, the inductance coil comprises a magnetic sleeve, the magnetic sleeve is installed in a through hole of the deformation part, a cylindrical framework is coaxially arranged in the magnetic sleeve, a magnetic core is arranged in the framework in a sliding fit mode, and one end of the adjusting nail abuts against the magnetic core. A reset spring is arranged between the two deformation parts, one deformation part is provided with a blind hole abutting against the reset spring, and the other deformation part is in threaded connection with a compression screw abutting against the reset spring. Mounting holes correspondingly penetrate through the lower portions of the two deformation parts, and threaded holes extending to the mounting holes are formed in the lower end faces of the deformation parts. The utility model has the advantages of very high resolution, higher stability, simple and reliable structure and convenience in installation, and is widely applied to the field of precision measurement.

Description

Technical Field

[0001] The utility model relates to the technical field of displacement sensors, in particular to a lever type displacement sensor. Background Technique

[0002] Parts need to be measured during the production process, before assembly and before leaving the factory, such as the measurement of form and position tolerances such as inner diameter, outer diameter, roundness, straightness, perpendicularity, etc. Usually, multiple pen type displacement sensors or multiple LVDT lever type displacement sensors are used for comprehensive measurement, and the corresponding measurement results are input to the upper computer, and the upper computer then analyzes and statistics the measurement data, so as to achieve the purpose of quality control of the produced products.

[0003] Pen type displacement sensors and LVDT lever type displacement sensors are widely used in the measurement of various industries,

[0004] Especially for the rapid detection of products such as shaft diameters and inner diameters of automotive parts. Currently, the commonly used displacement sensors include pen type displacement sensors and LVDT lever type displacement sensors. The structure of the pen type displacement sensor generally consists of an outer tube, an inner tube, a coil, a circuit board, an iron core, a measuring rod, a wire outlet, etc. The sensor coil is composed of a primary coil and two secondary coils. The mechanism of the LVDT lever type displacement sensor generally consists of a sensor base body, a circuit board, an inductance coil, a limit nail, a wire outlet, etc. The LVDT lever type displacement sensor is a sensor that is based on electromagnetic induction and uses the change of self-inductance or mutual inductance coefficient of the coil to measure the displacement.

[0005] The pen type displacement sensor can be used with corresponding measuring devices to measure data such as height, depth, outer diameter, roundness, etc. However, it is impossible to directly measure the inner diameter with a pen type sensor. Similarly, the LVDT lever type displacement sensor can also be used with corresponding measuring devices to measure some form and position tolerance data. Since the LVDT lever type displacement sensor has a structure that deforms on one side of the base body, it is also impossible to measure the inner diameter with a single LVDT lever type displacement sensor. Content of the Utility Model

[0006] The technical problem to be solved by the utility model is to overcome the existing defects, provide a lever type displacement sensor, which has high resolution, high stability, simple and reliable structure, convenient installation, and is widely used in the field of precision measurement, and can effectively solve the problems in the background technique.

[0007] To achieve the above object, the present utility model provides the following technical solution: A lever type displacement sensor, comprising an elastic body, the elastic body having two spaced and parallel deformation portions; an inductance coil is provided on one of the deformation portions, and an adjusting screw is threadedly connected to the other deformation portion corresponding to the inductance coil. The inductance coil includes a magnetic sleeve, the magnetic sleeve is installed in a through hole of the deformation portion, a cylindrical skeleton is coaxially provided inside the magnetic sleeve, a magnetic core is slidably fitted inside the skeleton, and one end of the adjusting screw abuts against the magnetic core; a return spring is provided between the two deformation portions, a blind hole for abutting against the return spring is provided on one of the deformation portions, and a pressing screw for abutting against the return spring is threadedly connected to the other deformation portion; mounting holes are correspondingly penetrated through the lower portions of the two deformation portions, and threaded holes extending to the mounting holes are provided on the lower end surfaces of the deformation portions; a circuit board is further provided on one of the deformation portions, the circuit board is electrically connected to the magnetic sleeve through a signal wire, and an outgoing wire is welded to the circuit board.

[0008] Preferably, a limit screw one is threadedly connected to one of the deformation portions, the limit screw one is located above the return spring, and the limit screw one abuts against the other deformation portion correspondingly.

[0009] Preferably, two limit screws two are further provided on the two deformation portions, the limit screw two is located below the return spring, a threaded through hole adapted to the limit screw two is provided on one of the deformation portions, and a counterbore adapted to the limit screw two is provided on the other deformation portion.

[0010] Preferably, the deformation portion is provided with a square groove for installing the circuit board, and the circuit board is fixed in the square groove by adhesive.

[0011] Preferably, a positioning taper pin is threadedly connected to the end of the magnetic core away from the adjusting screw, and the large head end of the positioning taper pin is adapted to the skeleton.

[0012] Preferably, the magnetic sleeve is locked and fixed in the through hole of the deformation portion by a fastening screw.

[0013] Preferably, a cable fixing head is provided at the upper end of the elastic body, and the outgoing wire passes through the cable fixing head.

[0014] Compared with the prior art, the beneficial effects of the present utility model are as follows: During measurement, two side rods are installed at the lower part of the elastic body and locked, and then extended into the inner diameter of the workpiece to be measured. The measuring rod contacts the inner wall, and the measuring rod acts on the deformation portion, causing the deformation portion to deform. Then, the deformation is converted into the movement of the magnetic core in the magnetic sleeve, and the magnetic sleeve outputs a signal through the signal wire, realizing the precise measurement of the inner diameter of the workpiece to be measured. It has a very high resolution, high stability, simple and reliable structure, and convenient installation, and is widely used in the field of precision measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic structural diagram of the present utility model;

[0016] Figure 2This is a cross-sectional view of the present utility model;

[0017] Figure 3 This is a schematic diagram of the partial structure of the present utility model;

[0018] Figure 4 This is a schematic diagram of the partial enlargement of the present utility model.

[0019] In the figure: 1 elastomer, 1.1 deformation part, 2 circuit board, 3 first limit pin, 4 return spring, 5 compression screw, 6 second limit pin, 7 fastening nail, 8 magnetic sleeve, 9 skeleton, 10 magnetic core, 11 positioning taper pin, 12 adjustment screw, 13 signal wire, 14 outgoing wire, 15 mounting hole. Specific embodiments

[0020] The present utility model can be explained in detail through the following embodiments. The purpose of disclosing the present utility model is to protect all technical improvements within the scope of the present utility model. In the description of the present utility model, it should be understood that if there are terms such as "upper", "lower", "front", "rear", "left", "right", etc. indicating the orientation or position relationship, it is only corresponding to the drawings of the present application for the convenience of describing the present utility model, rather than indicating or implying that the device or element referred to must have a specific orientation.

[0021] Please refer to Figures 1-4 , the present utility model provides a technical solution: a lever-type displacement sensor, including an elastomer 1, the elastomer 1 having two spaced and parallel deformation parts 1.1; an inductance coil is provided on one of the deformation parts 1.1, and an adjustment screw 12 is threadedly connected to the other deformation part 1.1 corresponding to the inductance coil,

[0022] Specifically, the inductance coil includes a magnetic sleeve 8, the magnetic sleeve 8 is installed in the through hole of the deformation part 1.1, a cylindrical skeleton 9 is coaxially provided inside the magnetic sleeve 8, a magnetic core 10 is slidably fitted inside the skeleton 9, the magnetic core 10 slides inside the skeleton 9, and when the magnetic core 10 moves, it changes the magnetic flux of the magnetic sleeve 8 and outputs a signal. One end of the adjustment screw 12 abuts against the magnetic core 10, and the adjustment screw 12 is adapted to the threaded hole on the deformation part 1.1. By changing the depth of the adjustment screw 12 screwed in, the position of the magnetic core 10 can be changed;

[0023] A return spring 4 is provided between the two deformation parts 1.1. A blind hole abutting against the return spring 4 is provided on one of the deformation parts 1.1, and a compression screw 5 threadedly connected to the return spring 4 is provided on the other deformation part 1.1. The purpose is to ensure that the elastomer 1 can return to its original state after the pressure is released, and the compression screw 5 is used to control the tensile force of the return spring 4;

[0024] Installation holes 15 penetrate through the lower parts of both deformation parts 1.1 correspondingly. The installation holes 15 are used to install probes or side rods. And threaded holes extending to the installation holes 15 are provided on the lower end faces of the deformation parts 1.1. The probes or side rods are fixed in the installation holes 15 by screwing locking screws into the threaded holes;

[0025] One of the deformation parts 1.1 is further provided with a circuit board 2. A square groove for installing the circuit board 2 is provided on the deformation part 1.1. The circuit board 2 is fixed in the square groove by adhesive; the circuit board 2 is electrically connected to the magnetic sleeve 8 through a signal wire 13, and an outgoing wire 14 is welded to the circuit board 2;

[0026] Furthermore, a first travel-limiting nail 3 is threadedly connected to one of the deformation parts 1.1. The first travel-limiting nail 3 is located above the return spring 4. The first travel-limiting nail 3 abuts against the other deformation part 1.1 correspondingly. The purpose of the first travel-limiting nail 3 is to prevent the elastic body 1 from deforming or being damaged when the force on it is too large;

[0027] Furthermore, two deformation parts 1.1 are further provided with a second travel-limiting nail 6. The second travel-limiting nail 6 is located below the return spring 4. One of the deformation parts 1.1 is provided with a threaded through hole adapted to the second travel-limiting nail 6, and the other deformation part 1.1 is provided with a counterbore adapted to the second travel-limiting nail 6. The purpose of the second travel-limiting nail 6 is to prevent the elastic body 1 from deforming or being damaged when the tensile force on it is too large;

[0028] Furthermore, a positioning taper pin 11 is threadedly connected to the end of the magnetic core 10 far away from the adjusting nail 12. The large head end of the positioning taper pin 11 is adapted to the skeleton 9. The magnetic core 10 axially slides in the skeleton 9 through the positioning taper pin 11; the magnetic sleeve 8 is locked and fixed in the through hole of the deformation part 1.1 through a fastening nail 7, which is convenient for disassembly and installation;

[0029] In addition, a cable fixing head is provided at the upper end of the elastic body 1, and the outgoing wire 14 passes through the cable fixing head.

[0030] When implementing the present utility model, two probes or side rods are symmetrically installed and locked on the two deformation parts 1.1 at the lower part of the elastic body 1, and then extended into the inner diameter of the workpiece to be measured. One end of the measuring rod contacts the inner wall of the workpiece to be measured, and the other end of the measuring rod acts on the deformation part. The deformation part deforms, and then the deformation is converted into the movement of the magnetic core 10 in the magnetic sleeve 8. Then the magnetic sleeve 8 outputs a signal through the signal wire 13 to realize the precise measurement of the inner diameter of the workpiece to be measured.

[0031] The parts not described in detail in the present utility model are prior art. For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above-mentioned exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present utility model; therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting, aiming to include all changes falling within the meaning and scope of the equivalent elements in the content of the present utility model.

Claims

1. A lever-type displacement sensor, characterized in that: The invention comprises an elastic body (1), wherein the elastic body (1) has two spaced-apart and parallel deformation parts (1.1); one of the deformation parts (1.1) is provided with an inductor coil, and the other deformation part (1.1) is threadedly connected with an adjustment pin (12) corresponding to the inductor coil; the inductor coil comprises a magnetic sleeve (8), the magnetic sleeve (8) is installed in a through hole of the deformation part (1.1), a cylindrical skeleton (9) is coaxially provided inside the magnetic sleeve (8), a magnetic core (10) is slidably fitted inside the skeleton (9), and one end of the adjustment pin (12) is in contact with the magnetic core (10); a magnetic sleeve (8) is provided between the two deformation parts (1.1); A reset spring (4) is provided in one of the deformation parts (1.1), wherein a blind hole abutting against the reset spring (4) is provided in one of the deformation parts (1.1), and a clamping screw (5) abutting against the reset spring (4) is threadedly connected to the other deformation part (1.1); mounting holes (15) are correspondingly penetrated through the lower parts of the two deformation parts (1.1), and threaded holes extending to the mounting holes (15) are provided on the lower end faces of the deformation parts (1.1); one of the deformation parts (1.1) is also provided with a circuit board (2), the circuit board (2) is electrically connected to the magnetic sleeve (8) via a signal line (13), and an output line (14) is welded to the circuit board (2).

2. A lever-type displacement sensor according to claim 1, characterized in that: One of the deformation parts (1.1) is threadedly connected to a limit pin (3), the limit pin (3) is located above the return spring (4), and the limit pin (3) is in corresponding conflict with the other deformation part (1.1).

3. The lever-type displacement sensor according to claim 1, characterized in that: The two deformation parts (1.1) are also provided with a second limit pin (6), and the second limit pin (6) is located below the reset spring (4). One of the deformation parts (1.1) is provided with a threaded through hole adapted to the second limit pin (6), and the other deformation part (1.1) is provided with a countersunk hole adapted to the second limit pin (6).

4. The lever-type displacement sensor according to claim 1, characterized in that: The deformable portion (1.1) is provided with a square groove for mounting a circuit board (2), and the circuit board (2) is fixed in the square groove by means of glue.

5. The lever-type displacement sensor according to claim 1, characterized in that: One end of the magnetic core (10) away from the adjustment pin (12) is threadedly connected to a positioning cone pin (11), and the large end of the positioning cone pin (11) is adapted to fit the frame (9).

6. The lever-type displacement sensor according to claim 1, characterized in that: The magnetic sleeve (8) is locked and fixed in the through hole of the deformation part (1.1) by means of a fastening nail (7).

7. The lever-type displacement sensor according to claim 1, characterized in that: The upper end of the elastic body (1) is provided with a cable fixing head, and the outlet wire (14) passes through the cable fixing head.

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