Protective structure of high-precision magnetostrictive displacement sensor

Abstract

The utility model provides a high -precision magnetostrictive displacement sensor's protection structure, including sensor body and the protection structure of setting in the sensor body outside, the sensor body includes the probe rod and is located the electronic warehouse of the probe rod one end, the utility model discloses outer protection shell and wear -resisting layer constitute high -strength outer layer frame, effectively resist the collision, rub and extrude, the double buffering mechanism of arc convex and metal spring piece of buffer layer, high -efficient absorption and dispersion vibration and impact energy, reduce the amplitude of transmission to the probe rod and electronic warehouse, avoid the displacement deviation or connection loose because of mechanical stress to core element, guarantee the long -term measurement accuracy and structural reliability of sensor in the vibration environment, adopt copper screen weave shielding layer and directly connect ground terminal, form continuous electromagnetic shield cover, can block outside electromagnetic noise penetration, pass through the ground loop and lead off interference charge simultaneously, improve the anti -interference ability and data reliability of sensor in the strong electromagnetic environment.

Description

Technical Field

[0001] This utility model belongs to the field of displacement sensor technology, and more specifically, it relates to the protective structure of a high-precision magnetostrictive displacement sensor. Background Technology

[0002] Magnetostrictive displacement sensors are based on the principle of magnetostriction. They accurately calculate displacement by measuring the time difference between the returned strain pulse signal and the excitation signal. They have advantages such as high precision, high reliability and non-contact measurement, and are widely used in precision position detection in industrial automation, mechanical control, hydraulic systems and other fields.

[0003] In existing technologies, traditional magnetostrictive displacement sensors have relatively simple protective measures, typically employing only a simple metal casing or rubber sealing structure, which has the following shortcomings:

[0004] 1. Insufficient mechanical protection: Ordinary shells are difficult to effectively absorb and disperse external impact and vibration energy. Long-term mechanical stress can easily lead to probe deformation or loosening of the electronic compartment connection, affecting measurement accuracy.

[0005] 2. Insufficient electromagnetic shielding performance: Conventional metal casings are not effectively connected to the grounding system, resulting in poor electromagnetic shielding. In strong electromagnetic environments, they are susceptible to interference, leading to increased signal noise and even data loss. Therefore, there is an urgent need to design a new protective structure that, through a multi-layered collaborative protection mechanism, balances mechanical strength, vibration damping, electromagnetic shielding, and environmental sealing performance to ensure the stable operation of high-precision magnetostrictive displacement sensors under complex working conditions. Utility Model Content

[0006] To solve the above-mentioned technical problems, this utility model provides a protective structure for a high-precision magnetostrictive displacement sensor, which is achieved by the following specific technical means:

[0007] A protective structure for a high-precision magnetostrictive displacement sensor includes a sensor body and a protective structure sleeved on the outside of the sensor body. The sensor body includes a probe and an electronic compartment located at one end of the probe. The protective structure includes an inner protective layer, a buffer layer, a shielding layer, an outer protective shell, and a sealing cap. The inner protective layer tightly wraps around the outside of the probe to isolate the probe from direct contact with the external environment. The buffer layer is sleeved on the outside of the inner protective layer, with its inner wall tightly fitted to the outer wall of the inner protective layer. The shielding layer tightly wraps around the outside of the buffer layer, with both ends of the shielding layer electrically connected to the grounding terminal of the electronic compartment. The outer protective shell is sleeved on the outside of the shielding layer.

[0008] The sealing cap is located at both ends of the outer protective shell. The sealing cap is threadedly connected to the outer protective shell. The center of the sealing cap has a through hole for the probe or electronic compartment cable to pass through. The inner wall of the through hole is provided with a sealing sleeve, and a sealing ring is embedded at the connection between the sealing cap and the outer protective shell.

[0009] Furthermore, the outer wall of the buffer layer is provided with uniformly distributed arc-shaped protrusions, and the buffer layer is embedded with a number of metal spring pieces that are spaced apart along the length of the probe rod.

[0010] Furthermore, the shielding layer has a copper mesh braided structure.

[0011] Furthermore, the sealing sleeve is made of nitrile rubber, and the inner wall of the sealing sleeve is tightly fitted to the probe or electronic compartment cable.

[0012] Furthermore, the protective structure also includes a wear-resistant layer disposed on the outside of the outer protective shell.

[0013] Furthermore, the space between the inner wall of the outer protective shell and the outer wall of the shielding layer is filled with epoxy resin for sealing.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] I. The protective structure of this high-precision magnetostrictive displacement sensor features an outer protective shell and a wear-resistant layer forming a high-strength outer frame that effectively resists collisions, friction, and compression. The buffer layer utilizes a dual buffering mechanism of arc-shaped protrusions and metal spring sheets to efficiently absorb and disperse vibration and impact energy, reducing the amplitude transmitted to the probe and electronic compartment. This prevents core components from experiencing displacement deviations or loosening due to mechanical stress, ensuring the sensor's long-term measurement accuracy and structural reliability in vibration environments. A copper mesh woven shielding layer is directly connected to the grounding terminal to form a continuous electromagnetic shielding cover. This effectively blocks external electromagnetic noise penetration and conducts interference charges away through the grounding loop, enhancing the sensor's anti-interference capability and data reliability in strong electromagnetic environments.

[0016] Second, through the synergistic sealing design of threaded sealing cap, sealing ring, nitrile rubber sealing sleeve and epoxy resin filling layer, the outer shell interface, wiring hole and interlayer gap are completely sealed, effectively preventing oil, water vapor, dust and corrosive media from entering the interior, and protecting the electronic circuit and probe detection element from pollution and corrosion. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall protective structure of the high-precision magnetostrictive displacement sensor of this utility model.

[0018] Figure 2 This is a schematic diagram of the cutaway structure of the protective structure of this utility model.

[0019] Figure 3 This is a plan view of the protective structure of this utility model.

[0020] Figure 4 This is a schematic diagram of the buffer layer of this utility model.

[0021] In the diagram, the correspondence between component names and drawing numbers is as follows:

[0022] 1. Electronic compartment; 11. Probe rod; 2. Protective structure; 21. Inner protective layer; 22. Buffer layer; 221. Metal spring; 222. Arc-shaped protrusion; 23. Shielding layer; 24. Outer protective shell; 25. Wear-resistant layer; 3. Sealing cover; 31. Wiring hole; 32. Sealing sleeve. Detailed Implementation

[0023] The embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of this utility model.

[0024] In the description of this utility model, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and 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. In addition, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0025] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0026] Example:

[0027] As attached Figure 1 To be continued Figure 4 As shown:

[0028] This utility model provides a protective structure for a high-precision magnetostrictive displacement sensor, including a sensor body and a protective structure 2 sleeved on the outside of the sensor body; the sensor body includes a probe 11 and an electronic compartment 1 located at one end of the probe 11; the protective structure 2 includes an inner protective layer 21, a buffer layer 22, a shielding layer 23, an outer protective shell 24, and a sealing cap 3; the inner protective layer 21 is made of polyimide film; the buffer layer 22 is made of silicone; the inner protective layer 21 tightly wraps around the outside of the probe 11 to isolate the probe 11 from direct contact with the external environment; the buffer layer 22 is sleeved on the outside of the inner protective layer 21, and the inner wall of the buffer layer 22 is tightly fitted to the outer wall of the inner protective layer 21; the shielding layer 23 tightly wraps around the outside of the buffer layer 22, and both ends of the shielding layer 23 are electrically connected to the grounding terminal of the electronic compartment 1; the outer protective shell 24 is sleeved on the outside of the shielding layer 23;

[0029] The sealing cover 3 is located at both ends of the outer protective shell 24. The sealing cover 3 is threadedly connected to the outer protective shell 24. The center of the sealing cover 3 is provided with a wire hole 31 for the probe rod 11 or the electronic compartment 1 cable to pass through. The inner wall of the wire hole 31 is provided with a sealing sleeve 32, and a sealing ring is embedded at the connection between the sealing cover 3 and the outer protective shell 24.

[0030] The outer wall of the buffer layer 22 is provided with uniformly distributed arc-shaped protrusions 222, and the buffer layer 22 is embedded with a number of metal spring pieces 221 that are spaced apart along the length of the probe rod 11.

[0031] Shielding layer 23 has a copper mesh braided structure;

[0032] The sealing sleeve 32 is made of nitrile rubber, and the inner wall of the sealing sleeve 32 is tightly fitted to the probe rod 11 or the cable of the electronic compartment 1.

[0033] The protective structure 2 also includes a wear-resistant layer 25 disposed on the outside of the outer protective shell 24, and the wear-resistant layer 25 is made of polytetrafluoroethylene.

[0034] The space between the inner wall of the outer protective shell 24 and the outer wall of the shielding layer 23 is filled with epoxy resin for sealing.

[0035] The working principle of this embodiment:

[0036] The outer protective shell 24 serves as the outer support frame of the protective structure 2, directly bearing the mechanical forces such as collisions and compressions from the external environment. The wear-resistant layer 25 added to its outer side can improve the anti-friction performance of the outer surface, preventing the outer protective shell 24 from being damaged due to friction during sensor installation and use, thus reducing the impact of external physical damage on internal components from the source. The inner protective layer 21 tightly wraps around the outside of the probe 11, directly isolating the probe 11 from direct contact with the external environment (such as oil, dust, corrosive gases, etc.), preventing the surface of the probe 11 from being corroded, scratched, or contaminated with impurities, ensuring the structural integrity of the probe 11, and avoiding the impact of probe 11 damage on detection accuracy.

[0037] When the sensor is subjected to external vibration or impact, the buffer layer 22 (sleeved on the outside of the inner protective layer 21) plays a major role in shock absorption: the uniformly distributed arc-shaped protrusions 222 on the outer wall of the buffer layer 22 can first absorb the external impact energy through their own deformation, reducing the direct transmission of the impact to the inner layer; the several metal spring pieces 221 embedded in the buffer layer 22 and spaced apart along the length of the probe rod 11 can secondarily buffer the vibration energy through elastic deformation, minimizing the vibration amplitude; the double buffer design can effectively reduce the impact of external forces on the probe rod 11 and the electronic compartment 1, avoid displacement deviation of core components or loosening of internal circuits due to vibration, and ensure the high-precision detection performance of the sensor;

[0038] The shielding layer 23 is tightly wrapped around the outside of the buffer layer 22. The copper mesh braided structure can form an "electromagnetic shielding cover" to physically block external electromagnetic interference signals from penetrating into the internal electronic chamber 1 and probe 11. The two ends of the shielding layer 23 are electrically connected to the grounding terminal of the electronic chamber 1, which can lead out the electromagnetic interference signals captured by the shielding layer 23 through the grounding loop, completely eliminating the influence of interference signals on the internal circuits of the electronic chamber 1 (such as signal processing modules and detection chips), and ensuring that the displacement detection signal output by the sensor is stable and accurate.

[0039] Step 4: The sealing caps 3 at both ends of the outer protective shell 24 are connected to the outer protective shell 24 by threads, and the connection is fitted with a sealing ring to block the medium from seeping into the gaps at both ends of the outer protective shell 24; the inner wall of the wire hole 31 in the center of the sealing cap 3 is provided with a sealing sleeve 32 made of nitrile rubber, and the sealing sleeve 32 fits tightly with the probe 11 (or the cable of the electronic compartment 1) to prevent the medium from seeping into the gap between the wire hole 31 and the component; the epoxy resin sealant filling between the inner wall of the outer protective shell 24 and the outer wall of the shielding layer 23 can fill the tiny gaps between the two structures to form a "seamless sealing layer", further blocking the path of the medium from the outer layer to the inner layer; the triple sealing works together to effectively prevent internal components (such as the circuit of the electronic compartment 1 and the detection element of the probe 11) from getting damp, corroded or contaminated by dust, extending the service life of the sensor and maintaining its performance stability.

[0040] The embodiments of this utility model are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the utility model to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described in order to better illustrate the principles and practical applications of this utility model, and to enable those skilled in the art to understand this utility model and design various embodiments with various modifications suitable for a particular purpose.

Claims

1. A protective structure for a high-precision magnetostrictive displacement sensor, characterized in that, The sensor body includes a sensor body and a protective structure (2) fitted around the outside of the sensor body. The sensor body includes a probe (11) and an electronic compartment (1) located at one end of the probe (11). The protective structure (2) includes an inner protective layer (21), a buffer layer (22), a shielding layer (23), an outer protective shell (24), and a sealing cap (3). The inner protective layer (21) tightly wraps around the outside of the probe (11) to isolate the probe (11) from direct contact with the external environment. The buffer layer (22) is fitted around the outside of the inner protective layer (21), and the inner wall of the buffer layer (22) is tightly fitted with the outer wall of the inner protective layer (21). The shielding layer (23) tightly wraps around the outside of the buffer layer (22), and both ends of the shielding layer (23) are electrically connected to the grounding terminal of the electronic compartment (1). The outer protective shell (24) is fitted around the outside of the shielding layer (23). The sealing cap (3) is located at both ends of the outer protective shell (24). The sealing cap (3) is threadedly connected to the outer protective shell (24). The sealing cap (3) has a wire hole (31) in the center for the probe (11) or the electronic compartment (1) cable to pass through. The inner wall of the wire hole (31) is provided with a sealing sleeve (32), and a sealing ring is embedded at the connection between the sealing cap (3) and the outer protective shell (24).

2. The protective structure of the high-precision magnetostrictive displacement sensor as described in claim 1, characterized in that: The outer wall of the buffer layer (22) is provided with uniformly distributed arc-shaped protrusions (222), and the buffer layer (22) is embedded with a number of metal spring pieces (221) spaced apart along the length direction of the probe (11).

3. The protective structure of the high-precision magnetostrictive displacement sensor as described in claim 1, characterized in that: The shielding layer (23) is a copper mesh woven structure.

4. The protective structure of the high-precision magnetostrictive displacement sensor as described in claim 1, characterized in that: The sealing sleeve (32) is made of nitrile rubber, and the inner wall of the sealing sleeve (32) is tightly fitted with the probe (11) or the cable of the electronic compartment (1).

5. The protective structure of the high-precision magnetostrictive displacement sensor as described in claim 1, characterized in that: The protective structure (2) also includes a wear-resistant layer (25) disposed on the outside of the outer protective shell (24).

6. The protective structure of the high-precision magnetostrictive displacement sensor as described in claim 1, characterized in that: The space between the inner wall of the outer protective shell (24) and the outer wall of the shielding layer (23) is filled with epoxy resin sealant.

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