Magnetostrictive displacement sensor

Abstract

This application relates to the field of sensor technology. Given that existing magnetostrictive displacement sensors suffer from poor adaptability to pressure differences and low explosion-proof performance, this application proposes a magnetostrictive displacement sensor, comprising: a housing with a accommodating cavity, and a wire hole, a pressure relief hole, and a through hole; a measuring rod assembly including a measuring rod and a magnetic ring; the magnetic ring having a built-in magnetic core, the magnetic ring being fitted around the outer periphery of the measuring rod and movable along the measuring rod; a pressure relief component disposed within the pressure relief hole to seal it; a sensor body including a signal board, a sensitive element, and a position sensing element; the sensitive element and the signal board being connected; the position sensing element extending into the interior of the measuring rod through the through hole; and a connecting wire connected to the signal board. When external or internal air pressure changes, the pressure relief component can be released to maintain a relative balance between the internal and external air pressures, thereby improving explosion-proof performance.

Description

Technical Field

[0001] This application relates to the field of sensor technology, and more specifically, to a magnetostrictive displacement sensor. Background Technology

[0002] Magnetostrictive displacement sensors are mainly used for hydraulic cylinder stroke detection and control, and are widely used in metallurgy, steel, port machinery, papermaking, chemical industry, new energy and other fields.

[0003] In related technologies, during prolonged use, especially in high-pressure or high-pressure environments, the internal air pressure of the sealing sleeve of a magnetostrictive displacement sensor may differ from the external air pressure. This pressure difference can put stress on the sensor's internal structure, affecting its measurement accuracy and stability; if the air pressure is too high, it may even cause safety hazards such as explosions. Utility Model Content

[0004] To address the problem that magnetostrictive displacement sensors in related technologies cannot adapt to air pressure differences and have poor explosion-proof performance.

[0005] This application proposes a magnetostrictive displacement sensor.

[0006] In view of this, this application proposes a magnetostrictive displacement sensor, comprising: a housing having a accommodating cavity, the housing having a wire hole, a pressure relief hole, and a through hole, all of which communicate with the outside and the accommodating cavity; a measuring rod assembly including a measuring rod and a magnetic ring; the measuring rod is hollow inside and located at the through hole, the magnetic ring having a built-in magnetic core, the magnetic ring being sleeved on the outer periphery of the measuring rod and movable along the measuring rod; a pressure relief component located inside the pressure relief hole to seal the pressure relief hole; a sensor body including a signal board, a sensitive element, and a position sensing element; the sensitive element and the signal board being connected and located within the accommodating cavity; the position sensing element extending into the interior of the measuring rod through the through hole; and a connecting wire passing through the wire hole and connected to the signal board.

[0007] In practical applications, when the magnetic ring moves on the measuring rod, the position sensing element detects the position change of the magnetic core inside the ring, thereby outputting a corresponding sensing signal. The sensing element receives the sensing signal and converts it into an electrical signal, which is then processed and output by the signal board. This continuous non-contact measurement method eliminates mechanical contact during measurement, thus preventing wear or accuracy degradation caused by mechanical friction and extending the lifespan of the magnetostrictive displacement sensor. Furthermore, when external or internal air pressure changes, the pressure relief device can be loosened to maintain a relative balance between the internal and external air pressures. This avoids the pressure difference affecting the sensor's internal structure, helping to maintain the sensor's measurement accuracy and stability, and improving its explosion-proof performance.

[0008] In some technical solutions, the magnetostrictive displacement sensor may optionally include a sealing gasket; the sealing gasket is disposed between the pressure relief component and the housing.

[0009] In the above technical solution, the sealing gasket can ensure a tight connection between the pressure relief component and the pressure relief hole, thereby preventing external media from entering the housing through the gap between the pressure relief component and the pressure relief hole, which helps to ensure the normal operation of the sensor and extend its service life.

[0010] In some technical solutions, the magnetostrictive displacement sensor may optionally include a grounding screw disposed on the housing; and / or an internal grounding clamping screw disposed within the accommodating cavity for connecting the circuitry of the housing and the sensor body. Grounding via the grounding screw allows current to be quickly conducted to the ground in the event of leakage or malfunction of the magnetostrictive displacement sensor, preventing damage to personnel and the sensor. The internal grounding clamping screw connects the circuitry of the sensor body to the tail cap, thus providing internal grounding and ensuring good grounding of the internal circuitry of the magnetostrictive displacement sensor. This helps reduce electromagnetic interference and electrostatic discharge risks within the internal circuitry, improving the sensor's electrical performance and stability.

[0011] In some technical solutions, the probe assembly may optionally include an end cap; the end cap is disposed at the end of the probe away from the housing to close the probe.

[0012] In the above technical solution, the probe and the end cap form a complete and sealed structure, which can prevent external impurities from entering the interior of the probe, thereby helping to improve the reliability and service life of the entire magnetostrictive displacement sensor.

[0013] In some technical solutions, the sensor body may optionally include a mounting bracket; the mounting bracket is disposed within the accommodating cavity; and the signal board and the sensing element are disposed on the mounting bracket.

[0014] The mounting bracket provides a stable and reliable support platform for the signal board and sensitive components, allowing them to be firmly fixed in place and preventing displacement or loosening during operation.

[0015] In some technical solutions, the sensor body may optionally include a shielding cover; the shielding cover is disposed outside the signal board and the sensitive element; an insulating cover is disposed outside the shielding cover. The shielding cover can effectively block interference from external electromagnetic fields, thereby ensuring the normal operation of the internal circuitry; the insulating cover can effectively isolate the signal board and the sensitive element, thereby preventing current leakage or short circuits, thus ensuring the electrical safety and stability of the magnetostrictive displacement sensor.

[0016] In some technical solutions, the housing may optionally include a tail cover, a base, and a base; the base has a first opening and a second opening that are disposed opposite to each other and are connected; the tail cover is disposed at the first opening and the base is disposed at the second opening; the tail cover, the base, and the base together form an accommodating cavity; a wire hole is disposed on the tail cover, a pressure relief hole is disposed on the base, and a through hole is disposed on the base.

[0017] In some technical solutions, the base may optionally include a receiving seat and a protrusion; the receiving seat supports the base, the protrusion is disposed on the side of the receiving seat facing the tail cover and is nested in the base, and the end face of the protrusion facing the tail cover is provided with a mounting groove; wherein, the through hole and the mounting groove are connected.

[0018] In the above technical solution, the base is supported by a receiving seat, allowing the base to be placed stably on the base, which not only improves the sealing performance of the housing but also enhances its structural strength. Simultaneously, the design of the mounting groove provides a clear installation position for the sensor body, ensuring accurate positioning during installation and preventing displacement or loosening during operation.

[0019] In some technical solutions, the magnetostrictive displacement sensor may optionally include a sealing ring; wherein, the receiving seat has an annular groove on the side facing the measuring rod; the sealing ring is disposed in the annular groove.

[0020] In practical applications, by designing annular grooves and sealing rings, an effective seal can be formed during assembly and installation, thereby significantly improving its overall protective performance and reliability.

[0021] In some technical solutions, the magnetostrictive displacement sensor may optionally include a waterproof connector, a waterproof connector, and a wire hole connection.

[0022] In the above technical solution, the connector adopts a waterproof design, which can ensure the safety and reliability of the magnetostrictive displacement sensor in harsh environments, extend the service life of the magnetostrictive displacement sensor, and reduce maintenance and replacement costs.

[0023] In some technical solutions, the diameter of the wire threading hole and the diameter of the pressure relief hole can be made equal. This eliminates the need to consider installation mismatch issues, and the positions of the waterproof connector and the pressure relief component can be interchanged. This allows for adjustment of the positions of the waterproof connector and the pressure relief component according to actual needs, enabling wires to exit in different directions.

[0024] Additional aspects and advantages of this application will become apparent in the following description or may be learned by practice of this application. Attached Figure Description

[0025] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0026] Figure 1 One of the structural schematic diagrams of a magnetostrictive displacement sensor in an embodiment of this application is shown;

[0027] Figure 2 A second schematic diagram of the structure of the magnetostrictive displacement sensor in an embodiment of this application is shown;

[0028] Figure 3 A schematic diagram of the housing structure in an embodiment of this application is shown.

[0029] in, Figures 1 to 3 The correspondence between the reference numerals and component names in the attached drawings is as follows:

[0030] 100 Housing; 110 Tail cap; 101 Wiring hole; 102 Pressure relief hole; 103 Through hole; 120 Base; 121 First opening; 122 Second opening; 130 Base; 131 Receiving seat; 1311 Annular groove; 132 Protrusion; 133 Mounting groove; 140 Accommodating cavity; 200 Sensor body; 210 Signal board; 220 Sensing element; 230 Mounting bracket; 240 Shielding cover; 250 Insulating cover; 260 Position sensing element; 300 Connecting wire; 400 Measuring rod assembly; 410 Measuring rod; 420 Magnetic ring; 421 Magnetic core; 430 Non-magnetic pad; 440 End cap; 500 Pressure relief component; 600 Sealing gasket; 710 Grounding screw; 720 Internal grounding clamping screw; 800 Sealing ring; 900 Waterproof connector. Detailed Implementation

[0031] To better understand the above-mentioned objectives, features, and advantages of this application, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0032] Many specific details are set forth in the following description in order to provide a full understanding of this application. However, this application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of this application is not limited to the specific embodiments disclosed below.

[0033] The following is combined with Figures 1 to 3 The magnetostrictive displacement sensor provided in this application will be described in detail through specific embodiments and application scenarios.

[0034] Reference Figures 1 to 3The embodiments of this application provide a magnetostrictive displacement sensor, the structure of which includes a housing 100, a sensor body 200, a connecting wire 300, a measuring rod assembly 400, and a pressure relief component 500.

[0035] Reference Figure 1 , Figure 2 and Figure 3 Specifically, the housing 100 has a receiving cavity 140. The housing 100 is provided with a wire hole 101, a pressure relief hole 102 and a through hole 103, all of which are connected to the outside and the receiving cavity 140.

[0036] The probe assembly 400 includes a probe 410 and a magnetic ring 420. The probe 410 is located at the through hole 103 and is hollow inside; the magnetic ring 420 has a built-in magnetic core 421, and is sleeved on the outer periphery of the probe 410 and can move along the probe 410.

[0037] The pressure relief component 500 is installed inside the pressure relief hole 102 to seal the pressure relief hole 102.

[0038] The sensor body 200 includes a signal board 210, a sensing element 220, and a position sensing element 260. The signal board 210 and the sensing element 220 are connected and located within the accommodating cavity 140. The signal board 210 is used to process the electrical signal converted by the sensing element 220 and output it to an external receiving device. The sensing element 220 is used to receive the sensing signal from the position sensing element 260 and convert it into an electrical signal. The position sensing element 260 extends into the interior of the measuring rod 410 through the through hole 103.

[0039] The connecting cable 300 passes through the wire hole 101 to connect the signal board 210 and external devices.

[0040] In practical applications, when the magnetic ring 420 moves on the measuring rod 410, the position sensing element 260 senses the position change of the magnetic core 421 inside the magnetic ring 420, thereby outputting a corresponding sensing signal. The sensing element 220 receives the sensing signal and converts it into an electrical signal, while the signal board 210 processes the electrical signal and outputs it. This continuous non-contact measurement method, because there is no mechanical contact during the measurement process, avoids wear or accuracy degradation caused by mechanical friction, thus extending the service life of the magnetostrictive displacement sensor. Furthermore, when the external or internal air pressure changes, the pressure relief component 500 can be loosened to maintain a relative balance between the air pressure inside the housing 100 and the external air pressure. This avoids the pressure effect of air pressure differences on the internal structure of the magnetostrictive displacement sensor, thereby helping to maintain the measurement accuracy and stability of the magnetostrictive displacement sensor and improving its explosion-proof performance.

[0041] In the above embodiment, the pressure relief component 500 is a pressure relief screw, that is, the pressure relief component 500 and the pressure relief hole 102 are threaded together. It can be understood that the pressure relief component 500 can also be snapped into the pressure relief hole 102.

[0042] Reference Figure 2 and Figure 3 In some embodiments, the housing 100 includes a tail cap 110, a base 120, and a base 130. The base 120 has a first opening 121 and a second opening 122 disposed opposite to each other, and the first opening 121 and the second opening 122 communicate with each other. The tail cap 110 is disposed at the first opening 121 to block the first opening 121. The tail cap 110 is provided with a wire hole 101. The base 130 is disposed at the second opening 122 to block the second opening 122. The tail cap 110, the base 120, and the base 130 together form a receiving cavity 140. The wire hole 101 is disposed on the tail cap 110, the pressure relief hole 102 is disposed on the base 120, and the through hole 103 is disposed on the base 130.

[0043] In the above embodiment, the signal board 210, the sensing element 220 and the position sensing element 260 are assembled together to form the sensor body 200. The base 130 and the measuring rod 410 are first welded together, and then the position sensing element 260 is inserted into the interior of the measuring rod 410 through the through hole 103, thereby realizing the installation of the sensor body 200. Finally, the base 120 and the tail cover 110 are added to complete the assembly of the entire magnetostrictive displacement sensor.

[0044] In practical applications, the wire hole 101 can also be set on the base 120 according to actual needs, so as to realize the side wire exit.

[0045] Reference Figure 3 In some embodiments, a sealing gasket 600 is provided between the pressure relief component 500 and the base 120.

[0046] In the above embodiments, the sealing gasket 600 can ensure a tight connection between the pressure relief component 500 and the pressure relief hole 102, thereby preventing external media (such as gas or liquid) from entering the housing 100 through the gap between the pressure relief component 500 and the pressure relief hole 102, which helps to ensure the normal operation of the magnetostrictive displacement sensor and extend its service life.

[0047] Reference Figure 1 and Figure 2 In some embodiments, the magnetostrictive displacement sensor further includes a grounding screw 710. The grounding screw 710 is disposed on the base 120. By grounding through the grounding screw 710, in the event of leakage or malfunction of the magnetostrictive displacement sensor, the current can be quickly conducted to the ground, preventing damage to personnel and the magnetostrictive displacement sensor.

[0048] In the above embodiment, the magnetostrictive displacement sensor further includes an internal grounding clamping screw 720; the internal grounding clamping screw 720 is disposed within the accommodating cavity 140 and is used to connect the circuitry of the tail cap 110 and the sensor body 200. By introducing the internal grounding clamping screw 720, the circuitry of the sensor body 200 is connected to the tail cap 110, thereby achieving internal grounding. This ensures good grounding of the internal circuitry of the magnetostrictive displacement sensor, thereby helping to reduce electromagnetic interference and electrostatic discharge risks in the internal circuitry, and improving the electrical performance and stability of the magnetostrictive displacement sensor.

[0049] In some embodiments, the probe assembly 400 further includes a non-magnetic pad 430. The non-magnetic pad 430 is connected to the magnetic ring 420 and is located on the side of the magnetic ring 420 away from the housing 100.

[0050] In practical applications, the stability and accuracy of the magnetic properties of the magnetic ring 420 are crucial for measurement precision. However, during actual installation, the material, shape, and position of the fittings can potentially affect the magnetism of the magnetic ring 420. The introduction of the non-magnetic pad 430 serves as an isolation layer during magnetic ring 420 installation, preventing direct contact between the fittings and the magnetic ring 420 and thus avoiding any impact on the magnetic properties of the ring. This ensures that the magnetism of the magnetic ring 420 does not change due to contact with the fittings, thereby guaranteeing the measurement accuracy of the magnetostrictive displacement sensor.

[0051] In some embodiments, the probe assembly 400 further includes an end cap 440. The end cap 440 is disposed at the end of the probe 410 away from the housing 100 to close the probe 410.

[0052] In the above embodiment, the probe 410 and the end cap 440 form a complete and sealed structure, which can prevent external impurities from entering the interior of the probe 410, thereby helping to improve the reliability and service life of the entire magnetostrictive displacement sensor.

[0053] In practical applications, the end cap 440 and the measuring rod 410 are welded together. The measuring rod 410 and the base 130 are welded together. The base 130 and the base 120 are welded together. The tail cap 110 and the base 120 are welded together. It adopts a fully enclosed design, providing a high level of protection, up to IP68.

[0054] In some embodiments, the sensor body 200 further includes a mounting bracket 230. The mounting bracket 230 is disposed within the receiving cavity 140; the signal board 210 and the sensing element 220 are disposed on the mounting bracket 230.

[0055] The mounting bracket 230 is disposed in the accommodating cavity 140, providing a stable and reliable support platform for the signal board 210 and the sensitive element 220, so that the signal board 210 and the sensitive element 220 can be firmly fixed, thereby preventing them from shifting or loosening during operation.

[0056] In some embodiments, the sensor body 200 further includes a shield 240. The shield 240 is disposed outside the signal board 210 and the sensing element 220 to cover the signal board 210 and the sensing element 220.

[0057] In practical applications, the signal board 210 and the sensing element 220 may be affected by external electromagnetic fields, which may affect the accuracy and stability of the measurement; while the shield 240 can effectively block these external electromagnetic field interferences, thereby ensuring the normal operation of the internal circuit.

[0058] In some embodiments, the sensor body 200 further includes an insulating cover 250. The insulating cover 250 is disposed outside the shielding cover 240.

[0059] In the above embodiments, the insulating cover 250 can effectively isolate the signal board 210 and the sensitive element 220, thereby preventing current leakage or short circuit, and ensuring the electrical safety and stability of the magnetostrictive displacement sensor.

[0060] In some embodiments, the base 130 includes a receiving seat 131 and a protrusion 132; the receiving seat 131 receives the base 120; the protrusion 132 is disposed on the side of the receiving seat 131 facing the tail cap 110 and is nested within the base 120; a mounting groove 133 is provided on the end face of the protrusion 132 facing the tail cap 110. The through hole 103 and the mounting groove 133 are connected.

[0061] In the above embodiment, the base 120 is supported by the receiving seat 131, allowing the base 120 to be placed stably on the base 130. This not only improves the sealing performance of the housing 100 but also enhances its structural strength. Simultaneously, the design of the mounting groove 133 provides a clear installation position for the sensor body 200, ensuring that the sensor body 200 is accurately positioned during installation and preventing displacement or loosening during operation.

[0062] In some embodiments, the magnetostrictive displacement sensor further includes a sealing ring 800. The receiving seat 131 has an annular groove 1311 on the side facing the measuring rod 410, and the sealing ring 800 is disposed within the annular groove 1311.

[0063] In the above embodiments, by designing the annular groove 1311 and the sealing ring 800, an effective seal can be formed during assembly and installation, thereby significantly improving its overall protective performance and reliability.

[0064] In some embodiments, the magnetostrictive displacement sensor further includes a waterproof connector 900. The waterproof connector 900 is connected to a wire hole 101. A connecting wire 300 extends through the waterproof connector 900 to the outside of the housing 100 for connection to an external device.

[0065] In the above embodiments, the connector adopts a waterproof design, which can ensure the safety and reliability of the magnetostrictive displacement sensor in harsh environments, extend the service life of the magnetostrictive displacement sensor, and reduce maintenance and replacement costs.

[0066] In practical applications, the diameter of the wire threading hole 101 is equal to the diameter of the pressure relief hole 102. This eliminates the need to consider installation mismatch issues, as the positions of the waterproof connector 900 and the pressure relief component 500 can be interchanged. This allows for adjustment of the positions of the waterproof connector 900 and the pressure relief component 500 according to actual needs, enabling wires to exit in different directions.

[0067] It should be clarified that in the claims, description, and accompanying drawings of this application, the term "multiple" refers to two or more objects. Unless otherwise explicitly defined, the terms "upper," "lower," 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 application and simplifying the description process, not to indicate or imply that the device or element referred to must have the described specific orientation, or be constructed and operated in a specific orientation. Therefore, these descriptions should not be construed as limitations on this application. The terms "connection," "installation," "fixing," etc., should be interpreted broadly. For example, "connection" can be a fixed connection between multiple objects, a detachable connection between multiple objects, or an integral connection; it can be a direct connection between multiple objects or an indirect connection between multiple objects through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in this application can be understood based on the specific circumstances of the above data.

[0068] In the claims, description, and accompanying drawings of this application, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this application. In the claims, description, and accompanying drawings of this application, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0069] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A magnetostrictive displacement sensor, characterized by, include The housing has a receiving cavity, and the housing is provided with a wire hole, a pressure relief hole and a through hole, the wire hole, the pressure relief hole and the through hole are all connected to the outside and the receiving cavity; A probe assembly, comprising a probe and a magnetic ring; the probe is hollow and disposed at the through hole; the magnetic ring has a built-in magnetic core, and is sleeved on the outer periphery of the probe and can move along the probe; A pressure relief component is disposed within the pressure relief hole to seal the pressure relief hole; The sensor body includes a signal board, a sensitive element, and a position sensing element; the sensitive element is connected to the signal board and is located within the accommodating cavity; the position sensing element extends into the interior of the measuring rod through the through hole. The connecting wire passes through the wire hole and connects to the signal board.

2. The magnetostrictive displacement sensor of claim 1, wherein, It also includes a sealing gasket; the sealing gasket is disposed between the pressure relief component and the housing.

3. The magnetostrictive displacement sensor of claim 1, wherein, Also includes: A grounding screw, which is disposed on the housing; and / or an inner grounding clamping screw, which is disposed within the accommodating cavity, for connecting the circuitry of the housing and the sensor body.

4. The magnetostrictive displacement sensor of claim 1, wherein, The probe assembly also includes an end cap; the end cap is disposed at the end of the probe away from the housing to close the probe.

5. The magnetostrictive displacement sensor of claim 1, wherein, The sensor body also includes a mounting bracket; the mounting bracket is disposed within the accommodating cavity; the signal board and the sensitive element are disposed on the mounting bracket.

6. The magnetostrictive displacement sensor of claim 5, wherein, The sensor body also includes: A shielding cover; the shielding cover is disposed on the outside of the signal board and the sensitive element; An insulating cover; the insulating cover is disposed on the outside of the shielding cover.

7. The magnetostrictive displacement sensor according to any one of claims 1 to 6, wherein The housing includes a tail cap, a base, and a base; the base has a first opening and a second opening disposed opposite to each other, the first opening and the second opening are connected, the tail cap is disposed at the first opening, the base is disposed at the second opening, and the tail cap, the base, and the base together form the receiving cavity. The threading hole is located on the tail cap, the pressure relief hole is located on the base, and the through hole is located on the base.

8. The magnetostrictive displacement sensor of claim 7, wherein, The base includes a support seat and a protrusion; the support seat supports the base, the protrusion is disposed on the side of the support seat facing the tail cap and is nested in the base, and the end face of the protrusion facing the tail cap is provided with a mounting groove; The through hole and the mounting groove are connected.

9. The magnetostrictive displacement sensor of claim 8, wherein, The magnetostrictive displacement sensor further includes a sealing ring; wherein, the receiving seat has an annular groove on the side facing the measuring rod; the sealing ring is disposed in the annular groove.

10. The magnetostrictive displacement sensor of claim 1, wherein, It also includes a waterproof connector, which is connected to the wire hole.

11. The magnetostrictive displacement sensor of claim 10, wherein, The diameter of the threading hole is the same as the diameter of the pressure relief hole.

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