Magnetostrictive sensor

Abstract

The utility model discloses a magnetostrictive sensor, relates to the field of displacement sensors, and can solve the problems that a magnetostrictive sensor in the prior art is large in size and difficult to install in a narrow installation space. The magnetostrictive sensor comprises a protective shell, a sensing circuit assembly connected to a containing cavity of the protective shell, a measuring rod assembly connected to the sensing circuit assembly, a magnetic ring arranged on the measuring rod assembly in a sleeving mode and used for being connected to a to-be-measured piece of a to-be-measured device, and a cable electrically connected to the sensing circuit assembly and extending to the outer wall of the protective shell. The protective shell comprises a protective cover and a base which is detachably connected to the protective cover and used for being installed on a device to be tested, the protective cover and the base define a containing cavity, and the sensing circuit assembly comprises a power panel electrically connected with the cable, a signal panel electrically connected with the power panel and a sensitive assembly core electrically connected with the signal panel. A waveguide wire of the measuring rod assembly is electrically connected to the sensitive assembly core body, and the base is provided with a containing groove used for embedding the sensitive assembly core body.

Description

Technical Field

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

[0002] Magnetostrictive sensors are precision displacement measuring devices based on the magnetostrictive effect, widely used in industrial automation, engineering machinery, hydraulic systems, and military applications. Their working principle involves utilizing the intersection of a current pulse propagating along a waveguide wire and an external magnetic field to generate a strain pulse. The measured position or displacement is determined by measuring the pulse propagation time. These sensors feature high precision, high reliability, and non-contact measurement, making them particularly suitable for applications requiring real-time monitoring and high-precision control.

[0003] In existing technologies, magnetostrictive sensors often suffer from large size in confined installation environments, leading to installation difficulties. For example, in mines, inside industrial equipment, or in the complex pipelines of hydraulic systems, the large size of existing magnetostrictive sensors limits their installation location and makes them unsuitable for space-constrained measurement scenarios. Utility Model Content

[0004] Therefore, this application provides a magnetostrictive sensor to solve the problem that existing magnetostrictive sensors are large in size and difficult to install in confined spaces.

[0005] To achieve the above objectives, this application provides the following technical solution:

[0006] A magnetostrictive sensor includes a protective housing, a sensing circuit assembly connected to a receiving cavity of the protective housing, a probe assembly connected to the sensing circuit assembly and extending to the outer wall of the protective housing, a magnetic ring sleeved on the probe assembly and used for connection to a test component of a device under test, and a cable electrically connected to the sensing circuit assembly and extending to the outer wall of the protective housing. The protective housing includes a protective cover and a base detachably connected to the protective cover and used for mounting on the device under test. The protective cover and the base form the receiving cavity. The sensing circuit assembly includes a power board electrically connected to the cable, a signal board electrically connected to the power board, and a sensitive component core electrically connected to the signal board. The waveguide wire of the probe assembly is electrically connected to the sensitive component core. The base has a receiving groove for embedding the sensitive component core.

[0007] Optionally, the protective cover has a first mounting hole that penetrates its own annular wall and is used to pass through the cable.

[0008] Optionally, the signal board is connected to the peripheral sidewall of the sensitive component core, and the power board is located at the end of the sensitive component core away from the probe assembly.

[0009] Optionally, the base has a central protrusion with the receiving groove, and the bottom of the receiving groove has a second mounting hole that extends to the other side of the base and is used to pass through the measuring rod assembly. The base has a mounting ring surface on the outer side of the central protrusion, and the mounting ring surface has a plurality of third mounting holes that cooperate with the device under test evenly along its circumferential direction. The protective cover has a plurality of fourth mounting holes that extend through itself and are used to cooperate with the third mounting holes. The plurality of third mounting holes and the plurality of fourth mounting holes correspond one-to-one.

[0010] Optionally, the central protrusion is provided with a clearance platform to facilitate cable routing.

[0011] Optionally, the outer peripheral wall of the central protrusion is provided with a first annular groove for fitting a first sealing ring, and the first sealing ring abuts against the inner wall of the protective cover.

[0012] Optionally, the base has an integrally formed connecting section on the side away from the receiving groove, the second mounting hole passes through the connecting section, and a welding protrusion ring is formed at the end of the connecting section away from the base to cooperate with the measuring rod assembly.

[0013] Optionally, a second annular groove is formed at the connection between the connecting section and the base, and a second sealing ring for abutting against the inner wall of the cylinder body of the hydraulic cylinder is embedded in the second annular groove.

[0014] Optionally, the probe assembly includes a waveguide wire connected to the core of the sensitive component, a probe sleeved on the outer periphery of the waveguide wire and connected to the second mounting hole, and a fluorine tube connected to the inner wall of the probe. The waveguide wire is located inside the fluorine tube. A fiberglass tube and a shielding tube are also sequentially sleeved between the waveguide wire and the fluorine tube. The welding protrusion is welded to the outer wall of the probe.

[0015] Optionally, the end of the measuring rod is welded with an end cap for sealing itself, and the end face of the end cap is an arc surface.

[0016] Optionally, a circuit board bracket is connected to the end of the sensitive component core, the power board and the signal board are connected to the circuit board bracket by fasteners, and one end of the fasteners is connected to the base. A first colloid is injected into the inner cavity of the sensitive component core, and a second colloid is injected into the receiving cavity to wrap the sensitive component core, the power board, the signal board and the cable extending into the receiving cavity.

[0017] Compared with the prior art, this application has at least the following beneficial effects:

[0018] The magnetostrictive sensor of this application is electrically connected to a power board via a cable, enabling power supply to both the external power source and the internal sensing circuit components. The power board is further electrically connected to a signal board and the sensing element core, forming a data transmission and power supply loop. During operation, the sensing element core generates current pulses through a circuit and sends an excitation signal to the waveguide wire inside the probe assembly. The excitation signal propagates along the waveguide wire, and under the magnetic field of the magnetic ring, the waveguide wire generates a mechanical wave. This mechanical wave propagates along the waveguide wire and is captured by the sensing element core. The sensing element core converts the mechanical wave signal into an electrical signal and transmits it to the signal board. After optimizing the signal, the signal board outputs a precise position signal via the cable.

[0019] The base and protective cover in the protective housing are designed with a detachable connection structure, making the installation and maintenance of the sensor more convenient. The receiving groove opened in the base allows part of the sensitive component core to be embedded in it, while the other part is located in the receiving cavity. In this way, the sensitive component core does not need to be completely arranged in the receiving cavity. In terms of design, the volume of the receiving cavity will be reduced accordingly, and the shape of the protective cover will be reduced accordingly. The overall protective housing is "flat", which is conducive to the installation of magnetostrictive sensors in confined installation environments. Attached Figure Description

[0020] To more intuitively illustrate the prior art and this application, several exemplary figures are provided below. It should be understood that the specific shapes and structures shown in the figures should not generally be regarded as limiting conditions for implementing this application; for example, based on the technical concept disclosed in this application and the exemplary figures, those skilled in the art are able to easily make conventional adjustments or further optimizations to the addition / reduction / classification, specific shapes, positional relationships, connection methods, size ratios, etc. of certain units (components).

[0021] Figure 1 This is a schematic diagram of the structure of a magnetostrictive sensor provided in one embodiment of this application;

[0022] Figure 2 for Figure 1 Side view;

[0023] Figure 3 for Figure 1 Partial structural sectional view;

[0024] Figure 4 for Figure 3 Enlarged view of point A in the middle;

[0025] Figure 5 for Figure 3 Enlarged view of point B;

[0026] Figure 6 for Figure 3 Enlarged view of point C;

[0027] Figure 7 This is a schematic diagram of a portion of the structure in which a magnetostrictive sensor is coupled with a hydraulic cylinder.

[0028] Figure 8 A schematic diagram of the structure of a protective cover for a magnetostrictive sensor provided in one embodiment of this application;

[0029] Figure 9 This is a schematic diagram of the structure of a base for a magnetostrictive sensor provided in one embodiment of this application;

[0030] Figure 10 for Figure 9 Another perspective view.

[0031] Explanation of reference numerals in the attached figures:

[0032] 1. Protective housing; 11. Protective cover; 111. Fourth mounting hole; 112. First mounting hole; 12. Base; 121. Third mounting hole; 122. Central protrusion; 1221. Receiving groove; 1222. Clearance platform; 1223. First annular groove; 1224. First sealing ring; 123. Connecting section; 1231. Second annular groove; 1232. Second sealing ring; 1233. Welded protruding ring; 124. Second mounting hole; 2. Sensing circuit assembly; 21. Power board; 22. Signal board; 23. Sensitive component core; 3. Measuring rod assembly; 31. Waveguide wire; 32. Measuring rod; 33. Fluorine tubing; 34. End cap; 4. Magnetic ring; 5. Cable; 6. Receiving cavity; 7. Waterproof connector; 8. Hydraulic cylinder. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0034] In the description of this application: unless otherwise stated, "a plurality of" means two or more. The terms "first," "second," "third," etc., in this application are intended to distinguish the objects referred to and do not have any special meaning in terms of technical connotation (e.g., they should not be construed as an emphasis on importance or order). Expressions such as "comprising," "including," and "having" also mean "not limited to" (certain units, components, materials, steps, etc.).

[0035] refer to Figure 1 , Figure 3 , Figure 5 and Figure 9This application discloses a magnetostrictive sensor, including a protective housing 1, a sensing circuit assembly 2 connected to a receiving cavity 6 of the protective housing 1, a probe assembly 3 connected to the sensing circuit assembly 2 and extending to the outer wall of the protective housing 1, a magnetic ring 4 sleeved on the probe assembly 3 and used for connecting to the test component of the device under test, and a cable 5 electrically connected to the sensing circuit assembly 2 and extending to the outer wall of the protective housing 1. The protective housing 1 includes a protective cover 11 and a base 12 detachably connected to the protective cover 11 and used for mounting on the device under test. The protective cover 11 and the base 12 form the receiving cavity 6. The sensing circuit assembly 2 includes a power board 21 electrically connected to the cable 5, a signal board 22 electrically connected to the power board 21, and a sensitive component core 23 electrically connected to the signal board 22. The waveguide wire 31 of the probe assembly 3 is electrically connected to the sensitive component core 23. The base 12 has a receiving groove 1221 for embedding the sensitive component core 23.

[0036] The magnetostrictive sensor of this application is electrically connected to the power board 21 via cable 5, realizing the power supply of the external power source and the internal sensing circuit assembly 2. The power board 21 is further electrically connected to the signal board 22 and the sensing component core 23, forming a data transmission and power supply loop. During operation, the sensing component core 23 generates current pulses through the circuit and sends an excitation signal to the waveguide wire 31 inside the measuring rod assembly 3. The excitation signal propagates along the waveguide wire 31, and under the action of the magnetic field of the magnetic ring 4, the waveguide wire 31 generates a mechanical wave. This mechanical wave propagates along the waveguide wire 31 and is captured by the sensing component core 23. The sensing component core 23 converts the mechanical wave signal into an electrical signal and transmits it to the signal board 22. After optimizing the signal, the signal board 22 outputs a precise position signal through cable 5.

[0037] The base 12 and the protective cover 11 in the protective housing 1 are designed as a detachable connection structure, which makes the installation and maintenance of the sensor more convenient. The receiving groove 1221 opened in the base 12 allows part of the sensitive component core 23 to be embedded therein, and the other part to be located in the receiving cavity 6. In this way, the sensitive component core 23 does not need to be completely arranged in the receiving cavity 6. In terms of design, the volume of the receiving cavity 6 will be reduced accordingly, and the shape of the protective cover 11 will be reduced accordingly. The protective housing 1 is "flat" as a whole, which is conducive to the installation of the magnetostrictive sensor in a narrow installation environment.

[0038] It should be noted that the specific structure and function of the sensitive component core 23 have been disclosed in patent literature (authorization announcement number: CN219956408U): A modular high-precision magnetostrictive sensitive component core 23 and displacement sensor. Since the sensitive component core 23, power board 21, cable 5, signal board 22 and measuring rod assembly 3 of this application are all prior art, their structure and function will not be described in detail here.

[0039] refer to Figure 1, Figure 2 , Figure 3 , Figure 8 The protective cover 11 has a first mounting hole 112 that penetrates its own annular wall and is used to pass through the cable 5.

[0040] The cable 5 extends through the first mounting hole 112 on the periphery of the protective cover 11. Unlike the traditional method of extending the cable 5 from the end away from the measuring rod assembly 3 on the central axis of the protective cover 11, the cable 5 outlet is arranged on the periphery. Since the magnetostrictive sensor is in the shape of a long rod, the cable 5 does not need to be arranged along the length of the magnetostrictive sensor, making the overall installation space of the magnetostrictive sensor more compact.

[0041] In some embodiments, the first mounting hole 112 is threaded with a waterproof connector 7 or a jet connector for mounting the cable 5. The waterproof connector 7 or jet connector is prior art and is used to improve waterproof performance and prevent external moisture from entering the receiving cavity 6 through the gap between the cable 5 and the first mounting hole 112.

[0042] In some embodiments, the power board 21 and the signal board 22 can be structurally integrated into one unit or arranged separately.

[0043] refer to Figure 5 The signal board 22 is connected to the peripheral wall of the sensitive component core 23, and the power board 21 is located at the end of the sensitive component core 23 away from the measuring rod assembly 3.

[0044] The power board 21 is located at the end of the sensitive component core 23 away from the probe assembly 3, and the signal board 22 is installed on the peripheral side wall of the sensitive component core 23. This overcomes the problem that the signal board 22 is arranged and installed along the length extension direction of the protective shell 1 in the current technology (i.e. the signal board 22 is located at the end of the sensitive component core 23), which increases the length of the protective shell 1. This further optimizes the space utilization of the internal structure and makes the protective shell 1 more "flat".

[0045] refer to Figure 9-10 The base 12 has a central protrusion 122 with a receiving groove 1221. The bottom of the receiving groove 1221 has a second mounting hole 124 that extends through to the other side of the base 12 and is used to pass through the measuring rod assembly 3. The base 12 has a mounting ring surface on the outer side of the central protrusion 122. The mounting ring surface has a plurality of third mounting holes 121 that are evenly provided along its circumferential direction to cooperate with the device to be tested. The protective cover 11 has a plurality of fourth mounting holes 111 that extend through itself and are used to cooperate with the third mounting holes 121. The plurality of third mounting holes 121 and the plurality of fourth mounting holes 111 correspond one-to-one.

[0046] The protective cover 11 is fitted onto the central protrusion 122 of the base 12, and multiple bolts and other fasteners are sequentially passed through the fourth mounting hole 111 of the protective cover 11 and the third mounting hole 121 of the base 12 to be threadedly connected to the device under test, thereby fixing the protective cover 11 and the base 12 onto the device under test.

[0047] It should be noted that the fourth mounting hole 111 on the protective cover 11 has a two-section structure. The section closer to the base 12 is threaded, while the section further away from the base 12 is unthreaded. A step is formed between the two sections for the bolt nut to abut.

[0048] The central protrusion 122 has a clearance platform 1222 for easy cable routing.

[0049] The clearance platform 1222 of the central protrusion 122 can provide sufficient space for the wiring of the sensing circuit assembly 2, simplifying the layout of the internal wiring and improving the installation efficiency and maintenance convenience of the sensor.

[0050] The outer peripheral wall of the central protrusion 122 is provided with a first annular groove 1223 for fitting the first sealing ring 1224, and the first sealing ring 1224 abuts against the inner wall of the protective cover 11.

[0051] refer to Figure 3-4 During installation, the first sealing ring 1224 fits tightly against the inner wall of the protective cover 11, effectively filling the gap between the protective cover 11 and the base 12, forming a reliable sealing structure. The first sealing ring 1224 can prevent external liquids, gases or other impurities from seeping into the interior of the sensor through the gap, thereby protecting key components such as the sensitive component core 23, the power board 21 and the signal board 22 from corrosion by the external environment.

[0052] refer to Figure 7-10 The base 12 has an integrally formed connecting section 123 on the side away from the receiving groove 1221. The second mounting hole 124 passes through the connecting section 123. The end of the connecting section 123 away from the base 12 has a welded protrusion ring 1233 that matches the measuring rod assembly 3.

[0053] The probe assembly 3 passes through the first mounting hole 112 of the base 12, and the connecting section 123 provides support and connection for the probe assembly 3. During the connection process, the welding protrusion 1233 at the end of the connecting section 123 away from the base 12 abuts against the outer wall of the probe assembly 3, and the welding protrusion 1233 is fused to the outer wall of the probe assembly 3 by a fusion welding process. The welding protrusion 1233 increases the penetration depth during welding, ensures the weld's firmness, and improves the connection strength between the probe assembly 3 and the base 12.

[0054] In some embodiments, a second annular groove 1231 is formed at the connection between the connecting segment 123 and the base 12, and a second sealing ring 1232 for abutting against the inner wall of the cylinder body of the hydraulic cylinder 8 is embedded in the second annular groove 1231.

[0055] The hardness of the second sealing ring 1232 is Shore A 90.

[0056] When the magnetostrictive sensor of this application is installed on the hydraulic cylinder 8, the base 12 of the protective housing 1 is fixed to the outer wall of the end of the hydraulic cylinder 8 away from the piston rod, and the connecting section 123 of the base 12 extends into the cylinder body. A second annular groove 1231 is provided on the outer peripheral wall of the connecting section 123. A second sealing ring 1232 fitted inside the second annular groove 1231 is tightly fitted against the inner wall of the hydraulic cylinder 8, forming a reliable sealing structure to prevent leakage of hydraulic oil or other liquids. The magnetic ring 4 is installed on the piston rod so that the sensor can monitor the precise displacement of the piston rod in real time.

[0057] refer to Figure 5-6 The probe assembly 3 includes a waveguide wire 31 connected to the sensitive component core 23, a probe 32 sleeved on the outer periphery of the waveguide wire 31 and connected to the second mounting hole 124, and a fluorine tube 33 connected to the inner wall of the probe 32. The waveguide wire 31 is located inside the fluorine tube 33. A fiberglass tube and a shielding tube are also sequentially sleeved between the waveguide wire 31 and the fluorine tube 33. A welding protrusion ring 1233 is welded to the outer wall of the probe 32.

[0058] The waveguide wire 31 is electrically connected to the sensitive component core 23. During operation, the sensitive component core 23 generates an excitation signal through the circuit and sends it to the waveguide wire 31. The waveguide wire 31 acts as the propagation medium for the excitation signal when the sensor is working. Through the transmission of the waveguide wire 31, the mechanical wave signal at the location of the magnetic ring 4 is captured and transmitted back to the sensitive component core 23 for processing. At the same time, the fluorine tube 33 is sleeved on the outer periphery of the waveguide wire 31 and connected to the inner wall of the measuring rod 32. It not only protects the waveguide wire 31 but also ensures the insulation performance between the sensitive component core 23 and the measuring rod assembly 3, avoiding the influence of electrical interference on signal transmission. The fiberglass tube protects the waveguide wire 31. The fiberglass tube itself is a flexible material with shock resistance. The shielding tube shields the sensitive component core 23 from external environmental interference and protects the sensitive component core 23.

[0059] In addition, due to its flexible material and shock-resistant properties, the fluorine tube 33 can absorb and mitigate the vibration and shock of the sensor in a high-vibration environment, thereby reducing the relative displacement or deformation of the waveguide wire 31 and the measuring rod assembly 3 and maintaining the long-term stability of the system. It should be noted that the fluorine tube 33 is existing technology.

[0060] refer to Figure 3The end of the measuring rod 32 is welded with an end cap 34 for sealing itself, forming a sealed structure. The design and welding process of the end cap 34 ensures the airtightness of the measuring rod 32, enabling it to withstand the high-pressure liquid inside the hydraulic cylinder 8 while preventing liquid penetration that could corrode or interfere with the internal waveguide wire 31, fluorine tubing 33, and the sensitive component core 23. The end face of the end cap 34 is an arc surface, which effectively reduces mechanical friction with the inner wall of the hydraulic cylinder 8 during sensor operation.

[0061] The hardness of the second sealing ring 1232 is Shore A 90.

[0062] refer to Figure 3 and Figure 5 The end of the sensitive component core 23 is connected to a circuit board bracket. The power board 21 and the signal board 22 are connected to the circuit board bracket by fasteners, and one end of the fasteners is connected to the base 12. The inner cavity of the sensitive component core 23 is injected with a first colloid, and the receiving cavity 6 is injected with a second colloid for wrapping the sensitive component core 23, the power board 21, the signal board 22 and the cable 5 extending into the receiving cavity 6.

[0063] The power board 21 and signal board 22 are connected to the base 12 through the circuit board bracket. The circuit board bracket presses on the end of the sensitive component core 23, that is, the circuit board bracket fixes the sensitive component core 23. Specifically, the fastener (M2 screw) passes through the power board 21, signal board 22 and circuit board and is fixed in the pre-set threaded hole inside the base 12. The connection stability between the components is enhanced by the circuit board bracket.

[0064] By injecting a first colloid into the inner cavity of the sensitive component core 23, the internal components of the sensitive component core 23 are encapsulated. This design not only isolates the intrusion of external liquids and gases but also provides shock absorption protection. A second colloid injected into the receiving cavity 6 similarly encapsulates the sensitive component core 23, power board 21, signal board 22, and cable 5, protecting the entire internal circuit system under high temperature, high pressure, and vibration environments. The application of the first and second colloids, by filling structural gaps to provide waterproofing and absorb vibration, improves the reliability and service life of the equipment.

[0065] In some embodiments, the first and second colloids can be sealants. After the corresponding components are installed, the sealant is injected into the corresponding cavity, filling all gaps and cavities. After the sealant cures, it forms a continuous and sealed protective layer inside the sensor, thereby achieving waterproof and dustproof functions, while effectively absorbing external vibrations and improving the stability and reliability of the sensor in high temperature, high pressure, and harsh environments.

[0066] The technical features of the above embodiments can be combined in any way (as long as there is no contradiction in the combination of these technical features). For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described; these embodiments not explicitly written should also be considered to be within the scope of this specification.

[0067] The present application has been described in a relatively specific and detailed manner above through general descriptions and specific embodiments. It should be understood that, based on the technical concept of the present application, several conventional adjustments or further innovations can be made to these specific embodiments; however, as long as they do not depart from the technical concept of the present application, the technical solutions obtained by these conventional adjustments or further innovations also fall within the protection scope of the claims of the present application.

Claims

1. A magnetostrictive sensor, characterized in that, The device includes a protective housing, a sensing circuit assembly connected to a receiving cavity of the protective housing, a probe assembly connected to the sensing circuit assembly and extending to the outer wall of the protective housing, a magnetic ring sleeved on the probe assembly and used for connecting to a device under test (DUT), and a cable electrically connected to the sensing circuit assembly and extending to the outer wall of the protective housing. The protective housing includes a protective cover and a base detachably connected to the protective cover and used for mounting on the DUT. The protective cover and the base form the receiving cavity. The sensing circuit assembly includes a power board electrically connected to the cable, a signal board electrically connected to the power board, and a sensitive component core electrically connected to the signal board. The waveguide wire of the probe assembly is electrically connected to the sensitive component core. The base has a receiving groove for embedding the sensitive component core.

2. The magnetostrictive sensor according to claim 1, characterized in that, The protective cover has a first mounting hole that penetrates its own annular wall and is used to pass through the cable.

3. The magnetostrictive sensor according to claim 1, characterized in that, The signal board is connected to the peripheral sidewall of the sensitive component core, and the power board is located at the end of the sensitive component core away from the probe assembly.

4. The magnetostrictive sensor according to claim 1, characterized in that, The base has a central protrusion with a receiving groove. The bottom of the receiving groove has a second mounting hole that extends to the other side of the base and is used to pass through the measuring rod assembly. The base has a mounting ring surface on the outer side of the central protrusion. The mounting ring surface has a plurality of third mounting holes that cooperate with the device under test evenly along its circumferential direction. The protective cover has a plurality of fourth mounting holes that extend through itself and cooperate with the third mounting holes. The plurality of third mounting holes and the plurality of fourth mounting holes correspond one-to-one.

5. The magnetostrictive sensor according to claim 4, characterized in that, The central protrusion is equipped with a clearance platform to facilitate cable routing.

6. The magnetostrictive sensor according to claim 4, characterized in that, The outer peripheral wall of the central protrusion has a first annular groove for fitting a first sealing ring, and the first sealing ring abuts against the inner wall of the protective cover.

7. The magnetostrictive sensor according to claim 4, characterized in that, The base has an integrally formed connecting section on the side away from the receiving groove, the second mounting hole passes through the connecting section, and a welding protrusion ring is formed at the end of the connecting section away from the base to cooperate with the measuring rod assembly.

8. The magnetostrictive sensor according to claim 7, characterized in that, A second annular groove is formed at the connection between the connecting section and the base, and a second sealing ring is embedded in the second annular groove for pressing against the inner wall of the cylinder body of the hydraulic cylinder.

9. The magnetostrictive sensor according to claim 7, characterized in that, The probe assembly includes a waveguide wire connected to the core of the sensitive component, a probe sleeved on the outer periphery of the waveguide wire and connected to the second mounting hole, and a fluorine tube connected to the inner wall of the probe. The waveguide wire is located inside the fluorine tube. A fiberglass tube and a shielding tube are also sequentially sleeved between the waveguide wire and the fluorine tube. The welding protrusion is welded to the outer wall of the probe.

10. The magnetostrictive sensor according to claim 1, characterized in that, The end of the sensitive component core is connected to a circuit board bracket. The power board and the signal board are connected to the circuit board bracket by fasteners, and one end of the fasteners is connected to the base. The inner cavity of the sensitive component core is injected with a first colloid, and the receiving cavity is injected with a second colloid for wrapping the sensitive component core, the power board, the signal board and the cable extending into the receiving cavity.

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