Magnetostrictive displacement sensor

Abstract

The utility model provides a magnetostrictive displacement sensor, relates to the technical field of measurement and control, and solves the technical problem in the prior art that the magnetostrictive displacement sensor is easily interfered by a magnetic field. The device comprises a waveguide wire, an induction coil, a waveguide wire loop and a shielding cover, the induction coil is sleeved on the circumference of the waveguide wire, the waveguide wire loop is wound on the induction coil by at least one circle, and the shielding cover is sleeved on the circumference of the induction coil. According to the utility model, the waveguide wire return wire is wound at the induction coil, the waveguide wire return wire forms a protective magnetic field when current passes through the waveguide wire return wire to play a shielding role, and the shielding cover is arranged at the periphery to further improve the shielding effect, so that the detection process is prevented from being interfered by the magnetic field.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of measurement and control technology, especially to a magnetostrictive displacement sensor. BACKGROUND

[0002] In the mechanical field, due to the increasing requirement of displacement precision, the requirement of displacement sensor environment is more and more harsh, and the grating ruler, resistance ruler and other displacement sensor products cannot meet the environment in harsh working conditions (such as outdoor, oil stain, dust, vibration, high temperature, high speed motion, etc.). The magnetostrictive displacement sensor emerges as the times require, and the magnetostrictive displacement sensor on the market usually includes a waveguide wire and a detection coil. Such a magnetostrictive displacement sensor has poor anti-interference ability, and the product becomes unstable after the sensor is interfered by a magnetic field. In severe cases, the product will directly shut down, and cannot be restored after restarting. CONTENT OF THE UTILITY MODEL

[0003] The utility model discloses a magnetostrictive displacement sensor, which solves the technical problem of being easily interfered by a magnetic field in the prior art. The preferred technical solutions in the utility model provide many technical effects, which are described below.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical scheme:

[0005] The magnetostrictive displacement sensor provided by the utility model includes a waveguide wire, an induction coil, a waveguide wire loop and a shielding cover. The induction coil is sleeved on the circumference of the waveguide wire. The waveguide wire loop is wound at least one turn on the induction coil. The shielding cover is sleeved on the circumference of the induction coil.

[0006] Preferably, the shielding cover is made of a demagnetized metal or alloy material.

[0007] Preferably, the shielding cover is made of a heat-treated nickel-iron alloy material.

[0008] Preferably, the utility model further includes a glass fiber tube. One end of the glass fiber tube is in communication with the shielding cover. The waveguide wire extends into the glass fiber tube from the shielding cover and extends to the end of the glass fiber tube away from the shielding cover.

[0009] Preferably, a damper is arranged on the waveguide wire near the end of the glass fiber tube away from the shielding cover. The waveguide wire loop is wound at least one turn at the damper. The waveguide wire loop extends to the end of the shielding cover away from the glass fiber tube.

[0010] Preferably, the utility model further includes a permanent magnet. The permanent magnet is arranged on one side of the glass fiber tube and near the end of the glass fiber tube away from the shielding cover.

[0011] The application has at least the following beneficial effects by adopting the above technical solutions:

[0012] The magnetostrictive displacement sensor comprises a waveguide wire, an induction coil, a waveguide wire loop and a shielding cover, the induction coil is sleeved on the circumference of the waveguide wire, the waveguide wire loop is wound at least one turn on the induction coil, and the shielding cover is sleeved on the circumference of the induction coil.

[0013] It should be understood that the foregoing general description and the following detailed description are only exemplary and explanatory and are not restrictive of the application. BRIEF DESCRIPTION OF DRAWINGS

[0014] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or the prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0015] Figure 1 is a schematic structural diagram of a magnetostrictive displacement sensor provided by the embodiment of the present application;

[0016] Figure 2 is Figure 1 a partial enlarged structural schematic diagram.

[0017] In the figure, 1 is a waveguide wire; 2 is an induction coil; 3 is a waveguide wire loop; 4 is a shielding cover; 5 is a glass tube; 6 is a damper; and 7 is a permanent magnet. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical scheme and advantages of the present application more clear, the technical scheme of the present application will be described in detail below. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of the present application.

[0019] The specific embodiment of the present application provides a magnetostrictive displacement sensor, which is combined with the accompanying drawings Figure 1As shown, it mainly includes a waveguide wire 1, an induction coil 2, a waveguide wire loop 3, and a shield 4. The induction coil 2 is sleeved around the circumference of the waveguide wire 1, and the waveguide wire loop 3 is wound around the induction coil 2 at least once. This allows a magnetic field to be formed at the induction coil 2 when current flows through the waveguide wire loop 3, thus providing a shielding effect. The shield 4 is sleeved around the circumference of the induction coil 2. By setting the shield 4, the shielding effect at the induction coil 2 is further improved, thus further avoiding the influence of the magnetic field.

[0020] In a specific embodiment of this application, the material of the shielding cover 4 is a demagnetized metal or alloy material; specifically, the material of the shielding cover 4 can be a heat-treated nickel-iron alloy material.

[0021] Furthermore, the heat treatment process for nickel-iron alloy materials includes heating at a high temperature to (1100~1200)℃, cooling at (110~120)℃ / h to (500~600)℃, and then cooling at not less than 400℃ / h to below 200℃ before unloading from the furnace.

[0022] This heat treatment of nickel-iron alloy materials can remove residual magnetism and improve the material's own magnetic field shielding stability.

[0023] In some embodiments, the system further includes a fiberglass tube 5, one end of which is connected to the shielding cover 4. A waveguide wire 1 extends from the shielding cover 4 into the fiberglass tube 5 and extends to the end of the fiberglass tube 5 furthest from the shielding cover 4. Figure 1 As shown, waveguide wire 1 enters from the left end of shield 4 and extends through shield 4 to the right end of fiberglass tube 5.

[0024] A damper 6 is installed on the waveguide wire 1 at the end of the fiberglass tube 5 that is close to the shield 4. That is, a damper 6 is installed at the right end of the waveguide wire 1. The waveguide wire loop 3 is wound around the damper 6 at least once, and the waveguide wire loop 3 extends to the end of the shield 4 that is far away from the fiberglass tube 5.

[0025] It also includes a permanent magnet 7, which is disposed on one side of the fiberglass tube 5 and close to one end of the fiberglass tube 5 that is away from the shielding cover 4.

[0026] In this utility model, the terms "one embodiment," "some embodiments," "example," "specific example," and "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Furthermore, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0027] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A magnetostrictive displacement sensor, characterized in that, It includes a waveguide wire, an induction coil, a waveguide wire loop, and a shield. The induction coil is sleeved around the circumference of the waveguide wire, the waveguide wire loop is wound around the induction coil at least once, and the shield is sleeved around the circumference of the induction coil.

2. The magnetostrictive displacement sensor according to claim 1, characterized in that, The shielding cover is made of demagnetized metal or alloy material.

3. The magnetostrictive displacement sensor according to claim 1, characterized in that, The shielding cover is made of heat-treated nickel-iron alloy.

4. The magnetostrictive displacement sensor according to claim 1, characterized in that, It also includes a fiberglass tube, one end of which is connected to the shielding cover, and the waveguide wire extends from the shielding cover into the fiberglass tube and extends to the end of the fiberglass tube away from the shielding cover.

5. The magnetostrictive displacement sensor according to claim 4, characterized in that, A damper is provided on the waveguide wire near one end of the fiberglass tube away from the shield, and the waveguide wire loop is wound at least one turn around the damper, extending to one end of the shield away from the fiberglass tube.

6. The magnetostrictive displacement sensor according to claim 5, characterized in that, It also includes a permanent magnet, which is disposed on one side of the fiberglass tube and close to one end of the fiberglass tube away from the shield.

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