Insulating device for magnetostrictive displacement sensor

Abstract

The utility model belongs to the technical field of sensors, and particularly discloses an insulating device for a magnetostrictive displacement sensor, which comprises a first insulator sleeved on a threaded section and a part of a measuring rod connected with the threaded section. The device further comprises a second insulator used for wrapping the surface of the magnetic ring, first through holes used for penetrating through the measuring rod are formed in the two faces, facing the length direction of the measuring rod, of the second insulator, and the diameter of each first through hole is larger than or equal to the inner diameter of the magnetic ring and smaller than the outer diameter of the magnetic ring. The axes of the circle centers of the two first through holes and the circle center of the magnetic ring are coaxial; the first insulator and the second insulator are made of insulating materials. The magnetostrictive displacement sensor magnetic scale is used for being installed on a magnetostrictive displacement sensor, and can achieve the purpose of effectively preventing interference of external current on magnetoscale signals, thereby improving the stability and accuracy of the magnetostrictive displacement sensor signals.

Description

Technical Field

[0001] The utility model belongs to the technical field of sensors, and in particular relates to an insulating device for a magnetostrictive displacement sensor. Background Art

[0002] In the fields of industrial automation, mechanical equipment and hydraulic systems, magnetostrictive displacement sensors are widely used as a common measuring device to measure linear displacement. Figure 1 As shown, the magnetostrictive displacement sensor mainly includes an electronic compartment 1, a threaded section 2-1 connected to the electronic compartment, a measuring rod 2-2 and a non-contact magnetic ring 3 sleeved on the measuring rod 2-2. The magnetic scale includes the electronic compartment 1, the magnetic ring 3 and a shielding wire. When the magnetostrictive displacement sensor is used in equipment such as a hydraulic cylinder, the external lead screw is connected to the magnetic ring to drive the magnetic ring to move along the length direction of the measuring rod. The magnetostrictive displacement sensor can convert the displacement of an object into an electrical signal output, providing key information for the control, monitoring and feedback of the equipment. During the operation of the magnetostrictive displacement sensor, since the threaded section 2-1 is made of conductive metal material, and due to factors such as electromagnetic interference and current leakage in the environment, the magnetic scale is often interfered by external current, resulting in sensor signal distortion, reducing the accuracy and reliability of the measurement. This interference affects the current flow in the sensor circuit through the magnetic scale itself, resulting in errors, poor stability and damage to equipment performance.

[0003] To solve the above problems, the prior art usually adds shielding wires to the sensor or improves the signal processing algorithm. The first method increases the cost of use, and the second method increases the complexity of processing. Moreover, both methods cannot completely eliminate stray current interference. Utility Model Content

[0004] The utility model aims to provide a magnetostrictive displacement sensor to solve the problem that the magnetostrictive displacement sensor is disturbed by stray current when in use.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0006] An insulating device for a magnetostrictive displacement sensor, comprising a first insulator for sleeved on a threaded segment and a portion of a measuring rod connected to the threaded segment;

[0007] It also includes a second insulator for covering the surface of the magnetic ring, wherein the second insulator is provided with first through holes for passing the measuring rod on both sides facing the length direction of the measuring rod, and the diameter of the first through hole is greater than or equal to the inner diameter of the magnetic ring and smaller than the outer diameter of the magnetic ring; the centers of the two first through holes and the axis where the center of the magnetic ring is located are coaxial;

[0008] The first insulator and the second insulator are made of insulating material.

[0009] As a limitation, the second insulator includes an upper cover body and a lower cover body that are detachably connected, and the upper cover body and the lower cover body together constitute a cavity that matches the shape and size of the magnetic ring, and the upper cover body and the lower cover body are both provided with a first through hole for passing the measuring rod, and the two first through holes are arranged to penetrate the cavity.

[0010] As a second limitation, it also includes a fixing seat, wherein a second through hole is formed on the fixing seat to pass through the measuring rod, the aperture of the second through hole is the same as the aperture of the first through hole, and the center of the second through hole is coaxial with the axis where the center of the first through hole is located;

[0011] The upper cover body and the lower cover body are both provided with a first connecting hole, the fixing seat is provided with a second connecting hole matching the first connecting hole, and the first connecting hole and the second connecting hole are connected by bolts and nuts matching the bolts.

[0012] As a third limitation, one section of the first insulator is sleeved on the threaded section, and the other section is sleeved on a portion of the measuring rod connected to the threaded section, and the first insulator sleeved on the threaded section is provided with an internal thread matching the external thread on the threaded section.

[0013] As a fourth limitation, the first insulator and the second insulator are made of nylon, and the fixing seat is made of metal.

[0014] Due to the adoption of the above technical solution, the utility model has the following beneficial effects compared with the prior art:

[0015] (1) The utility model effectively isolates the magnetic ring and the magnetic scale by sleeve-arranging a first insulator on the thread of the electronic compartment of the magnetostrictive displacement sensor and covering the second insulator on the magnetic ring, thereby cutting off the conduction path of the external current from the magnetic scale to the ground, preventing stray current from flowing through the magnetic scale, and effectively preventing the external current from interfering with the magnetic scale signal, thereby improving the stability and accuracy of the magnetostrictive sensor signal;

[0016] (2) In the utility model, the second insulator is arranged into two detachable parts, so that the installation and removal of the magnetic ring are convenient;

[0017] (3) In the present invention, since the second insulator is made of nylon, if the external lead screw is directly connected to the second insulator, it is easy to be loosely fixed and thus the external lead screw may fall off. By providing a fixing seat connected to the second insulator, the external lead screw is connected to the fixing seat of a metal material with a certain strength during use, so that the connection is more secure and the problem of the external lead screw falling off is avoided;

[0018] In summary, the utility model can solve the problem that the magnetostrictive displacement sensor is disturbed by stray current during use, resulting in low stability and reliability of the detection circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention is described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0020] Figure 1 It is a schematic diagram of the plane structure of the magnetostrictive displacement sensor in the background technology;

[0021] Figure 2 is a schematic cross-sectional structure diagram of the first insulator of this embodiment;

[0022] Figure 3 is a schematic cross-sectional structure diagram of the second insulator of this embodiment;

[0023] Figure 4 This is a schematic diagram of the structure of the upper cover body of this embodiment;

[0024] Figure 5 This is a schematic cross-sectional structure diagram of the fixing base and the second insulator of this embodiment;

[0025] Figure 6 This is a schematic diagram of the use status of this embodiment;

[0026] In the figure: 1, electronic compartment, 2-1, threaded section, 2-2, measuring rod, 3, magnetic ring, 4, first insulator, 5, upper cover body, 5-1, groove, 6, lower cover body, 7, first through hole, 8, first connecting hole, 9, fixing seat, 10, second connecting hole, 11, second through hole. DETAILED DESCRIPTION

[0027] In order to better explain the present invention and facilitate understanding, the preferred embodiments of the present invention are described in detail below through specific implementation modes in conjunction with the accompanying drawings.

[0028] Embodiment Insulation device for magnetostrictive displacement sensor

[0029] like Figure 2-Figure 6 As shown, this embodiment includes a first insulator 4 , a second insulator and a fixing seat 9 .

[0030] like Figure 2 As shown, the first insulator 4 can be divided into two parts connected as one body, the first part is used to be sleeved on Figure 1 The threaded section 2-1 of the external magnetostrictive displacement sensor shown is threadedly connected to the threaded section 2-1; the second part is used to be sleeved on the part of the measuring rod 2-2 connected to the threaded section 2-1, and its inner diameter is the same as the diameter of the measuring rod 2-2.

[0031] like Figure 3 and Figure 4 As shown, the second insulator includes an upper cover body 5 and a lower cover body 6 which are detachably connected. A groove 5-1 for accommodating the magnetic ring is provided on the upper cover body 5. The diameter of the groove 5-1 is the same as the outer diameter of the magnetic ring 3, and the depth of the groove 5-1 is half the height of the magnetic ring 3. At the same time, a first through hole 7 is provided at the top of the groove 5-1 of the upper cover body 5. The first through hole 7 is connected with the groove 5-1. The diameter of the first through hole 7 is greater than or equal to the inner diameter of the magnetic ring 3 and smaller than the outer diameter of the magnetic ring 3. The upper cover body 5 is also provided with four first connecting holes 8 that penetrate the upper bottom surface and the lower bottom surface of the cylinder. The four first connecting holes 8 are evenly arranged at 90° intervals along the circumference of the upper cover body 5.

[0032] In this embodiment, the structure of the lower cover body 6 is exactly the same as that of the upper cover body 5. The upper cover body 5 and the lower cover body 6 are symmetrically arranged, and when the upper cover body 5 and the lower cover body 6 are buckled together for use, they jointly form a cavity that matches the shape and size of the magnetic ring 3. At the same time, the center of the first through hole 7 of the upper cover body 5 and the lower cover body 6 is coaxial with the axis where the center of the magnetic ring 3 is located.

[0033] like Figure 5 As shown, the fixing seat 9 is provided with a second through hole 11 that passes through the measuring rod 2-2, and the aperture of the second through hole 11 is the same as the aperture of the first through hole 7. The fixing seat 9 is also provided with four second connection holes 10 that are the same as the aperture of the first connection holes 8 and correspond to the positions of the first connection holes 8. The first connection holes 8 of the upper cover body 5 and the lower cover body 6 and the second connection holes 10 of the fixing seat 9 are connected by bolts and nuts matched with the bolts.

[0034] The first insulator 4 and the second insulator are made of oil-resistant and corrosion-resistant insulating material, and in this embodiment, they are made of nylon; the fixing seat 9 is made of a metal material with a certain strength, and in this embodiment, it is made of steel.

[0035] The working principle of this embodiment is as follows: Figure 6 As shown, in this embodiment, when in use, the first insulator 4 is sleeved on the threaded section 2-1 and the part of the measuring rod 2-2 connected to the threaded section 2-1; the magnetic ring 3 is placed in the groove 5-1 of the upper cover body 5 and the lower cover body 6, and the fixing seat 9 is buckled with the lower cover body 6 to ensure that the second connecting hole 10 on the fixing seat 9 and the first connecting hole 8 on the upper cover body 5 and the lower cover body 6 correspond to each other, and the first connecting hole 8 and the second connecting hole 10 are connected by bolts and matching nuts. After connection, the fixing seat 9, the lower cover body 6, the magnetic ring 3 and the upper cover body 5 pass through the measuring rod 2-2 in sequence. The use of this embodiment effectively prevents the interference of external current on the magnetic scale signal, thereby improving the stability and accuracy of the magnetostrictive sensor signal.

Claims

1. An insulating device for a magnetostrictive displacement sensor, characterized in that: It includes a first insulator used for sleeved on the threaded section and a portion of the measuring rod connected to the threaded section; It also includes a second insulator for covering the surface of the magnetic ring, wherein the second insulator is provided with first through holes for passing the measuring rod on both sides facing the length direction of the measuring rod, and the diameter of the first through hole is greater than or equal to the inner diameter of the magnetic ring and smaller than the outer diameter of the magnetic ring; the centers of the two first through holes and the axis where the center of the magnetic ring is located are coaxial; The first insulator and the second insulator are made of insulating material.

2. The insulating device for a magnetostrictive displacement sensor according to claim 1, characterized in that: The second insulator includes an upper cover body and a lower cover body that are detachably connected, and the upper cover body and the lower cover body together constitute a cavity that matches the shape and size of the magnetic ring, and the upper cover body and the lower cover body are both provided with a first through hole for passing the measuring rod, and the two first through holes are arranged to penetrate the cavity.

3. The insulating device for a magnetostrictive displacement sensor according to claim 2, characterized in that: It also includes a fixing seat, on which a second through hole is formed for passing the measuring rod, the aperture of the second through hole is the same as the aperture of the first through hole, and the center of the second through hole is coaxial with the axis where the center of the first through hole is located; The upper cover body and the lower cover body are both provided with a first connecting hole, the fixing seat is provided with a second connecting hole matching the first connecting hole, and the first connecting hole and the second connecting hole are connected by bolts and nuts matching the bolts.

4. The insulating device for a magnetostrictive displacement sensor according to claim 3, characterized in that: One section of the first insulator is sleeved on the threaded section, and the other section is sleeved on a portion of the measuring rod connected to the threaded section. The first insulator sleeved on the threaded section is provided with an internal thread matching the external thread on the threaded section.

5. The insulating device for a magnetostrictive displacement sensor according to claim 4, characterized in that: The first insulator and the second insulator are made of nylon, and the fixing seat is made of metal.

Images