Magnetostrictive displacement sensor

Abstract

The application discloses a magnetostrictive displacement sensor, which comprises a shell, a waveguide wire assembly, a magnet and an adjusting assembly. The waveguide wire assembly is movably arranged in the shell. The waveguide wire assembly comprises a waveguide wire and a detection piece. A zero point and the detection piece are sequentially arranged on the waveguide wire. The waveguide wire is used for detecting the distance between the magnet and the detection piece by transmitting stress waves transferred in the waveguide wire through input pulse current. The magnet is used for connecting an object to be measured to move relative to the waveguide wire. The adjusting assembly is at least partially arranged in the shell and abuts against the waveguide wire assembly. The adjusting assembly is used for adjusting the distance between the detection piece and the zero point by controlling the horizontal movement of the waveguide wire assembly. The technical scheme of the application can compensate the transmission speed of the stress waves to reduce the measurement error.

Description

Technical Field

[0001] This invention relates to the field of sensor technology, and in particular to a magnetostrictive displacement sensor. Background Technology

[0002] Magnetostrictive displacement sensors are sensors developed using the magnetostrictive effect. A magnetostrictive displacement sensor includes a waveguide wire through which a pulsed current is passed. Because the current-carrying conductor generates a magnetic field, a magnetic field is formed around the waveguide wire. The sensor also includes a magnet, which is used to connect to the object being measured. When the object, carrying the magnet, moves to the vicinity of a certain position on the waveguide wire, the magnetic field of the magnet itself is superimposed on the magnetic field of the waveguide wire, generating a torsional stress at that location. This torsional stress is transmitted along the waveguide wire in the form of a wave. A detection element is placed on the waveguide wire to detect this stress wave, allowing for the recording of the time it takes for the stress wave to travel to and return from the detection element. The location of the magnet can then be deduced from the time it takes for the stress wave to return, thus enabling the determination of the distance to the object being measured.

[0003] For ease of measurement, a zero point is typically set on the magnetostrictive displacement sensor. This zero point serves as a relative reference point for the magnet's position and is located between the magnet and the sensing element. The distance between the zero point and the sensing element is a fixed value. Generally, this distance is pre-stored in the magnetostrictive displacement sensor before it leaves the factory, so it can be directly obtained when calculating displacement. The distance between the magnet and the sensing element can be calculated by measuring the distance between the zero point and the magnet.

[0004] In the mass production of magnetostrictive displacement sensors, the preset distance (zero-point setting position) between the zero point and the detection element 33 is the same for each magnetostrictive displacement sensor. However, the waveguide wire's manufacturing process, dimensions, materials, assembly precision of related components, and stress release phenomena all affect the transmission speed of stress waves along the waveguide wire. This can easily lead to discrepancies between the stress wave transmission speed and the straightness of the waveguide wire in the produced magnetostrictive displacement sensors and the standard values, resulting in errors in the measured distance between the magnet and the zero point. Therefore, a magnetostrictive displacement sensor capable of compensating for stress wave transmission speed is needed to reduce measurement errors.

[0005] There is currently no effective solution to the above problems. Summary of the Invention

[0006] The main objective of this invention is to provide a magnetostrictive displacement sensor that can compensate for stress wave propagation velocity in order to reduce measurement errors.

[0007] To achieve the above objectives, the present invention proposes a magnetostrictive displacement sensor, comprising:

[0008] shell;

[0009] A waveguide wire assembly is movably disposed within the housing. The waveguide wire assembly includes a waveguide wire and a detection element. A zero point and the detection element are sequentially provided on the waveguide wire. The waveguide wire is used to sense the stress wave transmitted in the waveguide wire by passing in a pulse current, so as to detect the distance between the magnet and the detection element.

[0010] The magnet is used to connect to the object under test for movement relative to the waveguide wire; and

[0011] An adjustment component, at least partially disposed within the housing and abutting against the waveguide wire assembly, is used to adjust the distance between the detection element and the zero point by controlling the horizontal movement of the waveguide wire assembly.

[0012] Optionally, the adjustment component includes:

[0013] A first wedge, at least partially disposed within the housing and abutting against the waveguide wire assembly; and

[0014] An adjusting member, at least partially disposed within the housing and abutting against one side of the first wedge in the horizontal direction, is used to control the horizontal movement of the first wedge to drive the waveguide wire assembly to move horizontally synchronously.

[0015] Optionally, the outer casing has a connecting hole that communicates with the interior of the outer casing, and the connecting hole extends vertically.

[0016] The adjusting element includes:

[0017] The second wedge is disposed inside the outer casing and abuts against one side of the first wedge in the horizontal direction. The second wedge is provided with a threaded hole, and the projection of the connecting hole on the second wedge covers the threaded hole.

[0018] A screw, which is rotatably inserted sequentially into the connecting hole and the threaded hole, is used to drive the second wedge to move up and down by rotating the screw, thereby pushing the first wedge to move horizontally.

[0019] Optionally, the first wedge has a first inclined surface on the side facing the second wedge, and the first inclined surface is inclined relative to the horizontal plane;

[0020] The second wedge has a second inclined surface on the side facing the first wedge. The second inclined surface is parallel to the first inclined surface and can slidably abut against each other.

[0021] Optionally, the adjustment assembly further includes an elastic element disposed within the housing, wherein the first wedge, the detection element, and the elastic element are arranged sequentially in the horizontal direction, and the elastic element abuts against the waveguide wire assembly;

[0022] The adjusting member pushes the first wedge, the first wedge pushes the waveguide wire assembly, and the waveguide wire assembly compresses the elastic member to adjust the position of the waveguide wire assembly.

[0023] Optionally, the detection element includes:

[0024] A coil, the coil being disposed within the housing, the coil having two coil segments spaced apart and electrically connected;

[0025] A nickel sheet, located between the two coil segments and disposed on the waveguide wire; and

[0026] A bias magnet is disposed inside the housing and located on the side of one of the coil segments opposite to the nickel sheet;

[0027] The waveguide wire actuates the nickel sheet, causing a change in the potential difference of the coil to detect stress waves.

[0028] Optionally, the waveguide wire assembly further includes a mounting bracket, which abuts against the adjustment assembly. The upper surface of the mounting bracket is provided with a groove, which fixes the coil and the bias magnet. A through hole is formed in the bottom wall of the groove. The mounting bracket is provided with a mounting hole, which is located below the groove and connected to the through hole.

[0029] One end of the waveguide wire passes through the mounting hole and is fixed on the mounting bracket. The nickel sheet passes through the through hole to connect the waveguide wire.

[0030] Optionally, the waveguide wire assembly further includes a shield located within the housing, the shield housing containing the detection element.

[0031] Optionally, the waveguide wire assembly further includes a circuit board disposed within the housing. The circuit board is electrically connected to one end of the waveguide wire to provide pulse current to the waveguide wire. The circuit board is also electrically connected to the detection element for receiving detection information.

[0032] Optionally, the waveguide wire assembly further includes a protective tube and a wax tube, the protective tube being disposed inside the housing, the wax tube being inserted inside the protective tube, and the end of the waveguide wire facing away from the detection element being inserted inside the wax tube.

[0033] The adjustment component of this invention adjusts the distance between the detection element and the zero point by controlling the horizontal movement of the waveguide wire assembly. This allows for compensation of the deviation in stress wave transmission speed when there is a deviation in the stress transmission speed of the waveguide wire, thereby reducing measurement error.

[0034] When the stress wave propagation velocity changes due to factors such as the waveguide wire's manufacturing process, dimensions, materials, assembly precision of related components, and stress release phenomena, the adjustment component can control the horizontal movement of the waveguide wire assembly to adjust the distance between the sensing element and the zero point. If the stress wave propagation velocity is too low, the distance between the sensing element and the zero point is decreased; if the stress wave propagation velocity is too high, the distance is increased. In this way, by adjusting the distance between the sensing element and the zero point, the stress wave propagation velocity can be compensated for, thereby reducing measurement errors. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0036] Figure 1 This is a structural cross-sectional view of an embodiment of the magnetostrictive displacement sensor of the present invention;

[0037] Figure 2 for Figure 1 A magnified view of a section at point A in the middle;

[0038] Figure 3 for Figure 1 A magnified view of a section at point B.

[0039] Explanation of icon numbers:

[0040] label name label name 100 Magnetostrictive displacement sensor 10 shell 10a Zero point 10d Connection hole 30 waveguide assembly 31 Mounting rack 31a Mounting holes 311 groove 311a Via 32 waveguide wire 33 Test pieces 331 coil 3311 coil segment 333 Nickel sheet 335 Bias magnet 34 Shielding cover 35 circuit board 36 wax tube 37 protective tube 50 magnet 70 Adjustment components 71 elastic element 73 First wedge 73a First inclined surface 75 Adjustment component 751 Second wedge 751a Second inclined surface 751b Threaded hole 753 screw

[0041] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0042] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0043] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0044] Furthermore, the use of terms such as "first" and "second" in this invention is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this invention.

[0045] This invention proposes a magnetostrictive displacement sensor.

[0046] like Figures 1 to 3 As shown, in one embodiment of the present invention, the magnetostrictive displacement sensor 100 includes a housing 10, a waveguide wire assembly 30, a magnet 50, and an adjustment assembly 70. The waveguide wire assembly 30 is movably disposed within the housing 10 and may include a waveguide wire 32 and a detection element 33. A zero point 10a and a detection element 33 are sequentially disposed on the waveguide wire 32. The waveguide wire 32 is used to pass a pulse current, and the detection element 33 is used to sense the stress wave transmitted in the waveguide wire 32 to detect the distance between the magnet 50 and the detection element 33. The magnet 50 is used to connect to the object to be measured so as to move relative to the waveguide wire 32. The adjustment assembly 70 is at least partially disposed within the housing 10 and abuts against the waveguide wire assembly 30. The adjustment assembly 70 is used to adjust the distance between the detection element 33 and the zero point 10a by controlling the horizontal movement of the waveguide wire assembly 30.

[0047] In this embodiment, the waveguide wire assembly 30 can be a component for sensing changes in the position of the magnet 50. In some embodiments, the waveguide wire assembly 30 may also include more or fewer components, such as a PCB board. The specific design can be determined according to the actual situation, and this specification does not limit this embodiment.

[0048] In this embodiment, the waveguide wire assembly 30 may include a waveguide wire 32, also known as a magnetostrictive wire, which exhibits the Wiedmann effect and is primarily composed of an iron-nickel alloy sensitive to magnetic fields. When a pulsed current is applied to the waveguide wire 32, a magnetic field is generated by the current-carrying conductor, thus creating a first magnetic field in the waveguide wire 32. The magnet 50 can be a natural magnet, an electromagnet, or any other object capable of generating a magnetic field. The magnet 50 generates a second magnetic field. When the first and second magnetic fields are superimposed, a stress wave is generated on the waveguide wire 32, which propagates along the waveguide wire 32. The detection element 33 on the waveguide wire assembly 30 can detect the stress wave. Since the propagation speed of the stress wave on the waveguide wire 32 is constant, the position of the magnet 50 can be deduced simply by recording the propagation time of the stress wave, thereby allowing the detection of the displacement of the magnet 50.

[0049] For ease of measurement, a zero point 10a can be set on the magnetostrictive displacement sensor 100 as a relative reference point for the position of the magnet 50. This zero point 10a can be a manually set origin, a fixed position that does not move with the waveguide wire 32. In practical applications, the distance between the magnet 50 and the zero point 10a is often used as the distance the magnet 50 moves. It should be noted that since the zero point 10a is manually set, it is generally located between the magnet 50 and the detection element 33. It can be set closer to the detection element 33, closer to the magnet 50, or at other locations; those skilled in the art can set it according to actual needs.

[0050] In this embodiment, the zero point 10a can be preset before the magnetostrictive displacement sensor 100 leaves the factory. In the same batch of magnetostrictive displacement sensors 100, the preset distance between the zero point 10a and the detection element 33 of each magnetostrictive displacement sensor 100 can be the same. However, since the process, size, material, assembly accuracy of related mating devices, and stress release phenomenon of waveguide wire 32 will affect the transmission speed of stress wave on waveguide wire 32, it is easy to cause the stress wave transmission speed of the produced magnetostrictive displacement sensor 100 to be inconsistent with the stress wave transmission speed of the standard magnetostrictive displacement sensor 100. This results in an error in the distance between the magnet 50 and the zero point 10a measured by the produced magnetostrictive displacement sensor 100.

[0051] In this embodiment, the detection element 33 can be a device for detecting stress waves. For example, it can be a detection element 33 with a strain gauge attached to the waveguide wire 32; or it can be a device with a bias magnet 335, a coil 331, and a nickel plate 333, connected to the waveguide wire 32 via the nickel plate 333. When the stress wave is transmitted to the nickel plate 333, it will cause the nickel plate 333 to vibrate, which will cause a change in the potential difference of the coil 331, thereby detecting the stress wave. Of course, the method of detecting stress waves by the detection element 33 is not limited to the above examples. Those skilled in the art may make other changes based on the technical essence of the embodiments in this specification. However, as long as the function and effect achieved are the same as or similar to those in the embodiments of this specification, they should be covered within the protection scope of the embodiments of this specification.

[0052] In this embodiment, the adjustment component 70 can be disposed within the housing 10, or it can be partially disposed within the housing 10 while the other part is disposed outside the housing 10. Those skilled in the art can choose according to actual needs. In some embodiments, the adjustment component 70 can be a motor and a lead screw used for linear drive to adjust the position of the waveguide wire assembly 30; it can also be a first wedge 73 cooperating with the adjustment member 75 to adjust the position of the waveguide wire assembly 30, as described below; or it can be other forms of adjustment. The way the adjustment component 70 controls the horizontal movement of the waveguide wire assembly 30 is not limited to the examples above. Those skilled in the art, inspired by the technical essence of the embodiments in this specification, may make other modifications, but as long as the function and effect achieved are the same as or similar to the embodiments in this specification, they should all be covered within the protection scope of the embodiments in this specification.

[0053] Understandably, by adjusting component 70, the waveguide wire assembly 30 can be moved horizontally to adjust the distance between the detection element 33 and the zero point 10a. This can compensate for the deviation in stress wave transmission speed when there is a deviation in the stress transmission speed of the waveguide wire 32, thereby reducing the measurement error.

[0054] In other words, the magnetostrictive displacement sensor 100 actually calculates the time it takes for the stress wave to travel from its origin to the detection element 33, and then multiplies the stress wave velocity by the time to obtain the distance between the stress wave origin point (i.e., the location of the magnet 50) and the detection element 33.

[0055] When the stress wave transmission speed changes due to factors such as the waveguide wire 32's manufacturing process, dimensions, materials, assembly precision of related components, and stress release phenomena, the adjustment component 70 can control the horizontal movement of the waveguide wire assembly 30 to adjust the distance between the detection element 33 and the zero point 10a. If the stress wave transmission speed is too low, the distance between the detection element 33 and the zero point 10a is decreased; if the stress wave transmission speed is too high, the distance between the detection element 33 and the zero point 10a is increased. Thus, by adjusting the distance between the detection element 33 and the zero point 10a, the stress wave transmission speed can be compensated for, thereby reducing measurement errors. Furthermore, adjusting the distance between the detection element 33 and the zero point 10a is essentially adjusting the distance between the detection element 33 and the stress wave emission point (i.e., the location of the magnet 50). This changes the time it takes for the stress wave to travel from emission to the detection element 33, thereby compensating for changes in stress wave speed with a change in time. Even though the stress wave velocity has changed, the calculation is still performed using the standard stress wave velocity, which is the standard stress wave velocity multiplied by the adjusted time. In this way, the accurate distance between the stress wave emission point (i.e., the location of the magnet 50) and the detection element 33 can be obtained, thereby reducing the measurement error.

[0056] like Figure 1 and Figure 2 As shown, in one embodiment of the present invention, the adjustment component 70 may include a first wedge 73 and an adjustment member 75. The first wedge 73 is disposed within the housing 10 and abuts against the waveguide wire assembly 30. It is understood that the first wedge 73 may also be partially disposed within the housing 10, and the specific location can be determined according to actual conditions; this specification does not limit this aspect.

[0057] In this embodiment, the adjusting member 75 may be at least partially disposed within the housing 10, or the adjusting member 75 may be completely disposed within the housing 10; alternatively, a portion of the adjusting member 75 may be disposed within the housing 10, and another portion may be disposed outside the housing 10. Those skilled in the art can configure the adjusting member 75 according to the manner in which it performs its function. The adjusting member 75 abuts against one side of the first wedge 73 in the horizontal direction, and is used to control the horizontal movement of the first wedge 73 to push the waveguide wire assembly 30 to move horizontally. The adjusting member 75 may be a movable device or component, such as a screw, a controllable telescopic spring, a combined slider, etc., and may be a combination of multiple devices. The specific configuration can be determined according to the actual situation, and this embodiment does not limit this.

[0058] In this embodiment, the adjusting member 75 may be a sliding block, a rack, a gear, or a motor. The gear meshes with the rack, and the rack is fixed on the sliding block. The motor drives the gear to rotate, which in turn drives the sliding block to move up and down via the rack. Alternatively, it may be a screw 753 and a second wedge 751 as described below, with the second wedge 751 moving up and down via a threaded transmission. Other effective methods may also be used, and those skilled in the art can make the settings according to actual needs.

[0059] Understandably, by having the adjusting member 75 abut against one side of the first wedge 73 in the horizontal direction, the adjusting member 75 can easily control the horizontal movement of the first wedge 73, thereby realizing the horizontal movement of the waveguide wire assembly 30. Furthermore, the first wedge 73 has a simple structure, is stable and reliable, and is easy to process and manufacture, thus saving costs.

[0060] It should be noted that the first wedge 73 can be made of aluminum, plastic, or other materials, and those skilled in the art can choose according to the actual situation.

[0061] In this embodiment, the aforementioned horizontal direction can refer to the direction of movement of the magnet 50 (i.e., Figure 1 The left and right directions in the text can also refer to the extension direction of the waveguide wire 32.

[0062] In one embodiment, the housing 10 has a connection hole 10d that communicates with the interior of the housing 10, and the connection hole 10d extends vertically.

[0063] The adjusting member 75 includes a second wedge 751 and a screw 753. The second wedge 751 is disposed inside the housing 10 and abuts against one side of the first wedge 73 in the horizontal direction. The second wedge 751 has a threaded hole 751b, and the projection of the connecting hole 10d on the second wedge 751 covers the threaded hole 751b. The screw 753 is rotatably inserted into the connecting hole 10d and the threaded hole 751b in sequence, and is used to drive the second wedge 751 to move up and down by rotating the screw 753, thereby pushing the first wedge 73 to move horizontally.

[0064] The projection of the connecting hole 10d onto the second wedge 751 refers to the orthographic projection of the connecting hole 10d onto the second wedge 751 (orthographic projection means that the parallel projection line is perpendicular to the projection plane), which covers the threaded hole 751b. In some embodiments, the cross-section of the connecting hole 10d can be equal to the cross-section of the threaded hole 751b; the cross-section of the connecting hole 10d can also be larger than the cross-section of the threaded hole 751b. The connecting hole 10d and the threaded hole 751b can be coaxially arranged to facilitate drilling; alternatively, the axis of the connecting hole 10d can be offset from the axis of the threaded hole 751b. Those skilled in the art can make selections according to actual needs. Furthermore, those skilled in the art may make other modifications based on the technical essence of the embodiments described in this specification, but as long as the achieved function and effect are the same as or similar to the embodiments described in this specification, they should all be covered within the protection scope of the embodiments described in this specification.

[0065] In this embodiment, the head of the screw 753 can protrude outside the housing 10 for easy tightening. The threaded section of the screw 753 is located inside the housing 10. The screw 753 is threadedly connected to the second wedge 751; tightening the screw 753 allows the second wedge 751 to rise, and loosening the screw 753 allows the second wedge 751 to fall.

[0066] Understandably, the second wedge 751 is connected to the screw 753 by a threaded connection, and the second wedge 751 is driven to rise or fall by a threaded transmission. This method is stable and reliable, and the adjustment range is not too large, which is conducive to precise control.

[0067] Furthermore, the magnetostrictive displacement sensor 100 is characterized by high accuracy and wide application range. However, due to limitations in process, materials, and assembly, it is difficult to ensure extremely high consistency in mass production of the entire device. The errors caused by this inconsistency will greatly affect the actual use effect. The magnetostrictive displacement sensor 100 of the present invention uses the adjusting screw 753 to drive the second wedge 751 to move up and down, thereby squeezing the first wedge 73 to move left and right in the horizontal direction, thereby pushing the entire waveguide wire assembly 30 to the horizontal position in the housing 10. In this way, the errors caused by poor transmission speed and poor straightness of the waveguide wire 32 are compensated by adjusting the actual signal return distance.

[0068] It should be noted that the material of the second wedge 751 can be aluminum, plastic, or other materials, and those skilled in the art can choose according to the actual situation.

[0069] like Figure 1 and Figure 2As shown, in one embodiment of the present invention, the first wedge 73 has a first inclined surface 73a on the side facing the second wedge 751, and the first inclined surface 73a is inclined relative to the horizontal plane. The second wedge 751 has a second inclined surface 751a on the side facing the first wedge 73, the second inclined surface 751a is parallel to the first inclined surface 73a, and they slidably abut against each other.

[0070] In some embodiments, the first inclined surface 73a may be as follows: Figure 2 The waveguide wire assembly 30 is inclined from the upper left to the lower right, with the adjusting member 75 abutting against the first inclined surface 73a. Thus, when it is necessary to increase the distance between the detection member 33 and the zero point 10a, the adjusting member 75 can be raised, sliding along the first inclined surface 73a and pushing the first wedge 73 to the right. The first wedge 73 then pushes the waveguide wire assembly 30 to the right, thereby increasing the distance between the detection member 33 and the zero point 10a.

[0071] The first inclined surface 73a can also be inclined from the upper right to the lower left, with the second inclined surface 751a of the adjusting member 75 abutting against the first inclined surface 73a. Thus, when it is necessary to increase the distance between the detection member 33 and the zero point 10a, the adjusting member 75 can be lowered, sliding along the first inclined surface 73a and pushing the first wedge 73 to the right. The first wedge 73 pushes the waveguide wire assembly 30 to the right, thereby increasing the distance between the detection member 33 and the zero point 10a.

[0072] Those skilled in the art can select the tilt direction and tilt angle of the first tilted surface 73a according to actual needs. The tilt angle of the first tilted surface 73a refers to the angle between the first tilted surface 73a and the horizontal plane. The tilt angle of the first tilted surface 73a can be selected according to actual needs, such as 30°, 45°, 60°, etc. The tilt direction and tilt angle of the second tilted surface 751a are determined by the specific setting of the first tilted surface 73a, as long as the second tilted surface 751a is kept parallel to the first tilted surface 73a. Those skilled in the art may make other changes based on the technical essence of the embodiments in this specification, but as long as the functions and effects achieved are the same as or similar to those in the embodiments of this specification, they should be covered within the protection scope of the embodiments of this specification.

[0073] Understandably, by having the second inclined surface 751a parallel to the first inclined surface 73a and slidably abutting against each other, the contact area between the second wedge 751 and the first wedge 73 is increased, making the sliding between the second inclined surface 751a and the first inclined surface 73a smoother. This improves the stability of the second wedge 751 pushing the first wedge 73. Furthermore, by having the first inclined surface 73a and the second inclined surface 751a slidably abutting against each other, the vertical movement of the second wedge 751 can be easily converted into the horizontal movement of the first wedge 73.

[0074] Furthermore, by setting inclined surfaces, the first wedge 73 and the second wedge 751 can improve the force conversion efficiency and facilitate changing the direction of the force to drive the waveguide wire assembly 30.

[0075] In this embodiment, the contact surface where the first wedge 73 and the second wedge 751 abut against each other may not be set as an inclined surface. For example, it may be set as a corresponding stepped shape, a vertical plane, etc. The specific design can be made according to the actual situation, and this embodiment of the specification does not limit it.

[0076] like Figure 1 and Figure 2 As shown, in one embodiment of the present invention, the adjustment component 70 may further include an elastic element 71, which may be disposed within the housing 10. The first wedge 73, the detection element 33, and the elastic element 71 are arranged sequentially in the horizontal direction. The elastic element 71 abuts against the waveguide wire assembly 30. The elastic element 71 is a device that can elastically stretch and contract, and is a device that can deform under compression to store elastic force. The deformed elastic element 71 will apply elastic force to the outside, which can be used to cooperate with the first wedge 73 to adjust the position of the waveguide wire assembly 30.

[0077] The adjusting member 75 pushes the first wedge 73, the first wedge 73 pushes the waveguide wire assembly 30, and the waveguide wire assembly 30 compresses the elastic member 71 to adjust the position of the waveguide wire assembly 30.

[0078] In this embodiment, the elastic element 71 is located on the side of the waveguide wire assembly 30 facing away from the first wedge 73 in the horizontal direction. The elastic element 71 abuts against the waveguide wire assembly 30, so that under the continuous elastic force applied by the elastic element 71 to the waveguide wire assembly 30, the adjusting member 75 drives the first wedge 73 to change the position of the waveguide wire assembly 30, so that the detection part of the waveguide wire 32 located on the waveguide wire assembly 30 can change the position, thereby adjusting the distance between the detection part and the zero point 10a. In addition, since the elastic element 71 applies a continuous elastic force to the waveguide wire assembly 30, gaps can be eliminated, and loosening of the contact between the adjusting member 75, the first wedge 73, the waveguide wire assembly 30, and the elastic element 71 can be avoided, thereby making the entire adjusting assembly 70 more stable and reliable.

[0079] Furthermore, the compressed elastic element 71 applies force to the waveguide wire assembly 30, which can eliminate poor contact or gaps between the contact surfaces that may exist in the left and right movement of the waveguide wire assembly 30, making the movement of the waveguide wire assembly 30 more precise and reliable.

[0080] It should be noted that the elastic element 71 can be a spring, a sheet, or other effective elastic element 71, and those skilled in the art can choose according to the actual situation.

[0081] like Figure 1 and Figure 3 As shown, in one embodiment of the present invention, the detection element 33 includes a coil 331, a nickel sheet 333, and a bias magnet 335. The coil 331 is disposed inside the housing 10 and has two coil segments 3311, which are spaced apart and electrically connected. The nickel sheet 333 is located between the two coil segments 3311 and is disposed on the waveguide wire 32. The bias magnet 335 is disposed inside the housing 10 and is located on the side of one coil segment 3311 opposite to the nickel sheet 333.

[0082] In this process, the waveguide wire 32 drives the nickel sheet 333, causing a change in the potential difference of the coil 331 to detect stress waves.

[0083] In this embodiment, the nickel sheet 333 is a sheet material made of nickel metal. The nickel sheet 333 is disposed on the waveguide wire 32, which can be connected by optical welding; it can also be connected by adhesive bonding; or it can be other effective fixing methods.

[0084] To make the stress wave signal transmitted back by the waveguide wire 32 easier to read, a nickel plate 333 is connected to the waveguide wire 32. The nickel plate 333 is located between the two coil segments 3311. A bias magnet 335 is provided near the coil 331. The bias magnet 335 provides a bias magnetic field for the coil 331 and the nickel plate 333. When the stress wave is transmitted to this point, the waveguide wire 32 will drive the nickel plate 333 to vibrate. Under the combined action of the nickel plate 333, the energized coil 331 and the bias magnetic field, a potential difference will be generated in the coil 331. This potential difference is the effective signal to be read.

[0085] Understandably, by setting up coil 331, nickel sheet 333, and bias magnet 335, it is easy to detect the stress wave signal transmitted back by waveguide wire 32, and the structure is simple, stable and reliable.

[0086] In this embodiment, the mounting bracket 31 is provided with a groove 311 and a mounting hole 31a, which allows the detection component 33 to be mounted on the mounting bracket 31. This allows the detection component 33 to move as the mounting bracket 31 moves, thus maintaining a constant detection position. Furthermore, it facilitates the positioning and installation of the detection component 33, improving assembly efficiency.

[0087] like Figure 1 and Figure 2 As shown, in one embodiment of the present invention, the waveguide wire assembly 30 may further include a mounting bracket 31, which abuts against the adjustment assembly 70. The upper surface of the mounting bracket 31 is provided with a groove 311, which fixes the coil 331 and the bias magnet 335. The bottom wall of the groove 311 is provided with a through hole 311a. The mounting bracket 31 is provided with a mounting hole 31a, which is located below the groove 311 and connected to the through hole 311a.

[0088] One end of the waveguide wire 32 passes through the mounting hole 31a and is fixed on the mounting bracket 31. The nickel sheet 333 passes through the through hole 311a to connect the waveguide wire 32.

[0089] In this embodiment, the mounting bracket 31 is provided with a groove 311 and a mounting hole 31a, which allows the coil 331, bias magnet 335, and waveguide wire 32 to be mounted on the mounting bracket 31. The coil 331, bias magnet 335, and waveguide wire 32 can move as the mounting bracket 31 moves, thereby maintaining the detection position on the waveguide wire 32. Furthermore, it facilitates the positioning and installation of the coil 331, bias magnet 335, and waveguide wire 32, improving assembly efficiency.

[0090] Furthermore, by fixing one end of the waveguide wire 32 to the mounting bracket 31, which is connected to the adjustment assembly 70, the adjustment assembly 70 can push the mounting bracket 31, thereby moving the detection element 33 and adjusting the distance between the detection element 33 and the zero point 10a. This avoids direct contact between the waveguide wire 32 and the adjustment assembly 70, protecting the waveguide wire 32. Also, since the detection element 33 is mounted on the mounting bracket 31, it moves along with the adjustment of its position, ensuring continuous detection of the stress wave of the detection element 33.

[0091] like Figure 1 and Figure 3 As shown, in one embodiment of the present invention, the waveguide wire assembly 30 further includes a shield 34, which is located inside the housing 10 and houses the detection element 33.

[0092] In this embodiment, the shielding cover 34 can be made of stainless steel, copper, or other materials. Understandably, by housing the detection component 33 within the shielding cover 34, external interference with the detection component 33 can be shielded, thereby ensuring the reliability of the detection component 33's operation.

[0093] like Figure 1As shown, in one embodiment of the present invention, the waveguide wire assembly 30 is further provided with a circuit board 35, which is disposed inside the housing 10. The circuit board 35 is electrically connected to one end of the waveguide wire 32 to provide pulse current to the waveguide wire 32. The circuit board 35 is electrically connected to the detection element 33 to receive detection information.

[0094] In this embodiment, a circuit board 35 is electrically connected to both the waveguide wire 32 and the detection element 33. This allows the circuit board 35 to both provide pulsed current to the waveguide wire 32 and receive detection information from the detection element 33, thereby controlling and calculating the stress wave propagation time. Specifically, the circuit board 35 starts timing from the moment it emits the pulsed current and stops timing upon receiving the signal from the detection element 33, thus obtaining the stress wave propagation time. It should be noted that the current propagation speed is extremely fast and generally negligible.

[0095] like Figure 1 As shown, in one embodiment of the present invention, the waveguide wire assembly 30 further includes a protective tube 37 and a wax tube 36. The protective tube 37 is disposed inside the housing 10, the wax tube 36 is inserted into the protective tube 37, and the end of the waveguide wire 32 facing away from the detection element 33 is inserted into the wax tube 36.

[0096] In this embodiment, the wax tube 36 is an insulating tube, and the waveguide wire 32 is inserted through the wax tube 36 to provide insulation protection for the waveguide wire 32. It can be understood that by having the end of the waveguide wire 32 facing away from the detection element 33 inserted through the wax tube 36, this end of the waveguide wire 32 facing away from the detection element 33 can be protected, preventing it from contacting metal, thereby improving the reliability of the waveguide wire 32's operation.

[0097] The protective tube 37 can be a plastic tube, an aluminum tube, or other types of tube. Understandably, the waveguide wire 32 is threaded through the wax tube 36 inserted into the protective tube 37. The straight protective tube 37 maintains the straightness of the waveguide wire 32, which affects the transmission speed of the stress wave. The better the straightness of the waveguide wire 32, the closer the transmission speed of the stress wave is to the standard value, thus reducing the measurement error. Furthermore, the protective tube 37 also serves to protect the waveguide wire 32.

[0098] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A magnetostrictive displacement sensor, characterized by, The utility model relates to a kind of detection device for distance, comprising: Shell; Waveguide wire assembly, the waveguide wire assembly is movably located in the shell, the waveguide wire assembly includes waveguide wire and detection piece, zero point and the detection piece are sequentially arranged on the waveguide wire, the waveguide wire is used to detect the distance between magnet and the detection piece by inducing stress wave transmitted in the waveguide wire by passing into pulse current; The magnet is used to connect the object to be detected to move relative to the waveguide wire; And Adjusting assembly, the adjusting assembly is at least partially located in the shell, and abuts against the waveguide wire assembly, the adjusting assembly is used to adjust the distance between the detection piece and the zero point by controlling the horizontal movement of the waveguide wire assembly; The adjusting assembly includes first wedge and adjusting piece, the first wedge is at least partially located in the shell, and abuts against the waveguide wire assembly;The adjusting piece is at least partially located in the shell, and abuts against one side of the first wedge in horizontal direction, and the adjusting piece is used to control the horizontal movement of the first wedge to push the waveguide wire assembly to move horizontally synchronously.

2. The magnetostrictive displacement sensor of claim 1 wherein, The shell is provided with a connecting hole communicating in the shell, and the connecting hole is vertically arranged; The adjusting piece includes: Second wedge, the second wedge is located in the shell, and abuts against one side of the first wedge in horizontal direction, and the second wedge is provided with a threaded hole, and the projection of the connecting hole on the second wedge covers the threaded hole; Screw, the screw is rotatably sequentially arranged in the connecting hole and the threaded hole, and is used to drive the second wedge to move up and down by rotating the screw, so as to push the first wedge to move horizontally.

3. The magnetostrictive displacement sensor of claim 2 wherein, One side of the first wedge towards the second wedge is provided with a first inclined surface, and the first inclined surface is arranged inclinedly relative to horizontal plane; One side of the second wedge towards the first wedge is provided with a second inclined surface, and the second inclined surface is parallel to the first inclined surface and slidably abuts against each other.

4. The magnetostrictive displacement sensor of claim 1 wherein, The adjusting assembly further includes elastic piece, the elastic piece is located in the shell, the first wedge, the detection piece, the elastic piece is sequentially arranged in horizontal direction, and the elastic piece abuts against the waveguide wire assembly; Wherein, the adjusting piece pushes the first wedge, the first wedge pushes the waveguide wire assembly, and the waveguide wire assembly compresses the elastic piece to adjust the position of the waveguide wire assembly.

5. The magnetostrictive displacement sensor of claim 1 wherein, The detection piece includes: Coil, the coil is located in the shell, the coil has two coil sections, and the two coil sections are arranged spaced apart and electrically connected; Nickel sheet, the nickel sheet is located between the two coil sections and arranged on the waveguide wire;And Bias magnet, the bias magnet is located in the shell and located on one side of the coil section away from the nickel sheet; Wherein, the waveguide wire drives the nickel sheet, so that the potential difference of the coil changes to detect stress wave.

6. The magnetostrictive displacement sensor of claim 5 wherein, The waveguide wire assembly further comprises a mounting frame abutting the adjusting assembly, an upper surface of the mounting frame is provided with a groove, the groove fixes the coil and the biasing magnet, a bottom wall of the groove is provided with a through hole, the mounting frame is provided with a mounting hole, the mounting hole is below the groove and is connected with the through hole; One end of the waveguide wire is arranged in the mounting hole and is fixed on the mounting frame, and the nickel sheet is arranged in the through hole to connect the waveguide wire.

7. The magnetostrictive displacement sensor of claim 1 wherein, The waveguide wire assembly further comprises a shielding cover, the shielding cover is arranged in the shell, and the shielding cover accommodates the detection member.

8. The magnetostrictive displacement sensor of claim 1 wherein, The waveguide wire assembly further comprises a circuit board, the circuit board is arranged in the shell, one end of the waveguide wire is electrically connected with the circuit board to provide pulse current for the waveguide wire, and the circuit board is electrically connected with the detection member to receive detection information.

9. The magnetostrictive displacement sensor of claim 1 wherein, The waveguide wire assembly further comprises a protection tube and a wax tube, the protection tube is arranged in the shell, the wax tube is arranged in the protection tube, and one end of the waveguide wire away from the detection member is arranged in the wax tube.

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