A magnetostrictive linear displacement sensor

Abstract

The invention discloses a magnetostrictive linear displacement sensor, which belongs to the field of displacement measuring devices. The sensor comprises a housing, a waveguide assembly connected inside the housing, a permanent magnetic slider slidably connected to the outside of the housing, a back cover and a joint part respectively fixed to two sides of the housing, wherein the joint part comprises a housing second fixed to one side of the housing and a terminal fixed to one side of the housing; the waveguide assembly comprises an outer tube plugged into the housing; the waveguide assembly consists of a single sensitive element head and a plurality of magnetostrictive sheets, wherein the plurality of magnetostrictive sheets adopt a laminated structure, a multi-layer magnetostrictive sheet structure and insulating materials between each layer, which can effectively increase the path resistance of eddy current, block the formation and expansion of eddy current, thereby reducing the intensity and loss of eddy current, and improving energy transfer efficiency. Reducing eddy current means reducing the heat caused by eddy current, and enhancing the sensitivity and accuracy of the sensor.

Description

Technical Field

[0001] The present invention relates to the field of displacement measuring devices, and more specifically, to a magnetostrictive linear displacement sensor. Background Art

[0002] The magnetostrictive linear displacement sensor is a sensor based on the magnetostrictive effect. It determines the position by measuring the propagation time of the mechanical wave in the waveguide.

[0003] Since magnetostrictive displacement sensors usually use coils as echo detection devices, when a large current inquiry pulse is loaded, the detection coil will produce a transient response, and the transient response of the coil will cause a dead zone of the magnetostrictive displacement sensor. The prior art (Chinese invention patent application with announcement number CN105674866A) discloses a low dead zone magnetostrictive displacement sensor, which suppresses the transient response of the detection coil by adding a compensation magnet close to the detection coil; although the dead zone of the magnetostrictive displacement sensor is reduced, the existing magnetostrictive linear displacement sensor still has some problems:

[0004] For example, when the current pulse in the waveguide generates an instantaneous magnetic field, the alternating magnetic field will induce an electromotive force in the waveguide material. According to Faraday's law of electromagnetic induction, this will form an induced current (also called eddy current) in the waveguide. The eddy current will generate heat during the propagation of the waveguide material, resulting in energy loss. This energy loss will cause the mechanical wave to gradually decay during the propagation process, affecting the accuracy of the sensor. Although this problem can be improved by selecting high magnetic permeability and low electrical conductivity materials to make waveguides, high magnetic permeability materials will produce a large magnetic flux change in the alternating magnetic field. According to Faraday's law of electromagnetic induction, the magnetic flux change will induce an electromotive force inside the material. This induced electromotive force will generate eddy currents even in materials with low electrical conductivity. At the same time, as long as the material has a certain electrical conductivity, eddy currents will be formed when there is an induced electromotive force. Even if the electrical conductivity is low, the induced electromotive force is still sufficient to drive eddy currents in high magnetic permeability materials. Therefore, in high-frequency applications, even high magnetic permeability materials with low electrical conductivity will produce significant eddy current losses. Summary of the invention

[0005] In view of the problems existing in the prior art, the object of the present invention is to provide a magnetostrictive linear displacement sensor.

[0006] To solve the above problems, the present invention adopts the following technical solutions.

[0007] A magnetostrictive linear displacement sensor, comprising a housing 1, a waveguide assembly connected to the interior of the housing 1, a permanent magnetic slider slidably connected to the exterior of the housing 1, a back cover and a joint portion respectively fixed to both sides of the housing 1, wherein the joint portion comprises a housing 2 fixed to one side of the housing 1 and a terminal fixed to one side of the housing 2;

[0008] The waveguide assembly includes an outer tube inserted into the first shell, a sensitive element head inserted into the outer tube, a sensing coil wound around the outside of the sensitive element head, a pulse generating end fixedly connected to the inside of the second shell and connected to the sensitive element head, a sensing end fixedly connected to the inside of the second shell and connected to the sensing coil, and a sensitive assembly inserted into the first shell and fixedly connected to one side of the sensitive element head;

[0009] The sensitive component includes a limiting part symmetrically fixed to one side of the sensitive element head, a plurality of magnetostrictive sheets inserted in the limiting part, an insulating layer separating the plurality of magnetostrictive sheets from each other, and a damping absorber located inside a shell and having one side fixed to one side of the plurality of magnetostrictive sheets.

[0010] Furthermore, the limiting portion includes two insulating side plates 1 symmetrically fixed to one side of the sensitive element head and two insulating side plates 2 symmetrically fixed to one side of the sensitive element head.

[0011] Furthermore, one end of the outer tube is inserted into the shell two, and the sensitive element head, sensing coil, pulse generating end and sensing end are all located inside the shell two. A control board is also connected to the shell two, and the control board is linearly connected to the sensing end and the pulse generating end.

[0012] Furthermore, a consumption reduction and vortex reduction part is connected to the inside of the outer tube, and the consumption reduction and vortex reduction part includes a mounting plate 1 fixedly connected to the inner wall of the outer tube, a circulating pump fixedly connected to one side of the mounting plate 1, a flow channel opened inside the outer tube, two pipes respectively connecting the output end and the input end of the circulating pump with two interfaces of the flow channel, and a semiconductor refrigeration component fixedly connected to one side of the rear cover, and the cold end of the semiconductor refrigeration component is in contact with the outer surface of one of the pipes.

[0013] Furthermore, two through grooves are provided inside the rear cover, the hot end of the semiconductor refrigeration element is inserted into one of the through grooves, and a plurality of fins are fixedly connected to one side of the hot end of the semiconductor refrigeration element.

[0014] Furthermore, an energy-saving recycling component is also connected to the inside of the outer tube, and the energy-saving recycling component includes a piezoelectric element sleeved on the outside of two insulating side plates, two coupling parts respectively fixed to the two sides of the magnetostrictive sheet, an AC / DC conversion part and a mounting plate 2 fixed to the inner wall of the outer tube, and an energy storage battery fixed to the mounting plate 2, and one side of the two coupling parts are both in contact with the inner wall of the piezoelectric element, and the positive and negative poles of the piezoelectric element are connected to the AC / DC conversion part.

[0015] Furthermore, fan 1 is fixedly connected to one side of the rear cover, and the air outlet side and air inlet side of fan 1 are respectively facing the pipe and one of the through slots, and two inclined slots connected to the other through slot are symmetrically opened inside the rear cover, and fan 2 is fixedly connected to the through slot connected to the inclined slot, and the air inlet side of fan 2 is facing the fins, and fan 1 and fan 2 are linearly connected to the energy storage battery.

[0016] Furthermore, the insulating side plate 2 is internally connected with an interlayer bonding reinforcement component, and the interlayer bonding reinforcement component includes a movable groove 1 opened inside the insulating side plate 2, a movable plate and a pressure plate slidably connected inside the insulating side plate 2, an extension portion integrally formed on one side of the movable plate, a screw rod rotatably connected inside the insulating side plate 2 and screwed in the extension portion, an inclined block 1 fixedly connected to one side of the movable plate, and an inclined block 2 fixedly connected to one side of the pressure plate, and one side of the pressure plate is in contact with one side of the magnetostrictive sheet.

[0017] Furthermore, a movable groove 2 connected to the movable groove 1 is also opened inside the insulating side plate 2, and extension plates are fixedly connected on both sides of the pressure plate. The extension plates are movably connected in the movable groove 2, and a guide column is fixedly connected to the inner wall of the movable groove 2, and the extension plates are movably sleeved on the outside of the guide column.

[0018] Furthermore, the circulation pump and the energy storage battery are both linearly connected to the control panel.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] (1) The waveguide component of the present scheme is composed of a single sensitive element head and multiple magnetostrictive sheets. The multiple magnetostrictive sheets adopt a laminated structure. The multi-layer magnetostrictive sheet structure with insulating materials between each layer can effectively increase the path resistance of the eddy current, block the formation and expansion of the eddy current, thereby reducing the intensity of the eddy current and the loss of the eddy current, and improving the energy transfer efficiency. Reducing the eddy current means reducing the heat caused by the eddy current, thereby reducing the temperature rise of the waveguide component, improving the overall performance and reliability of the system, and enhancing the sensitivity and accuracy of the sensor.

[0021] (2) This solution is provided with a consumption reduction and vortex reduction part. The circulating pump can circulate the coolant in the flow channel, and the semiconductor refrigeration component can be used to cool the coolant in the pipeline, which can effectively reduce the temperature of the waveguide component inside the outer tube, thereby reducing the flow and loss of eddy currents inside the conductor and keeping the waveguide working at a lower temperature. Not only does it reduce eddy current loss, but it can also improve the heat dissipation efficiency of the waveguide component. The improvement in heat dissipation efficiency helps to further reduce the temperature of the waveguide, maintain the stability of the electromagnetic properties of the waveguide material, thereby maintaining the stable distribution of the electromagnetic field, and improving the transmission efficiency and stability of the waveguide. At the same time, it can also reduce material aging and damage caused by high temperature, which helps to extend the service life of the waveguide and reduce maintenance costs.

[0022] (3) This scheme is provided with an energy-saving recovery component. The magnetostrictive sheet will undergo a slight mechanical deformation under the action of the magnetic field. The instantaneous magnetic field generated by the current pulse causes the material of the waveguide to undergo an instantaneous mechanical deformation, generating a mechanical wave. The mechanical wave acts on the piezoelectric element through the coupling component, causing the piezoelectric element to undergo mechanical deformation. The mechanical stress wave is converted into electrical energy through the piezoelectric element, and the electrical energy is stored while the stored electrical energy is used to operate the fan 1 and the fan 2. This can not only achieve rapid cooling of the hot end of the semiconductor refrigeration component and ensure the stable operation of the semiconductor refrigeration component, but also enable the coolant in the pipeline to cool more quickly, thereby achieving faster cooling and heat dissipation of the waveguide component. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 It is a schematic diagram of the outer tube structure of the present invention;

[0025] Figure 3 It is a schematic diagram of the structure of the sensing end, the sensitive element head, the pulse generating end and the control board of the present invention;

[0026] Figure 4 is a cross-sectional view of a waveguide assembly of the present invention;

[0027] Figure 5 It is a schematic diagram of the structure of the insulating side plate 1, the insulating side plate 2, the magnetostrictive sheet and the insulating layer of the present invention;

[0028] Figure 6 It is a schematic diagram of the structure of the consumption reduction and vortex reduction part and the energy-saving recovery component of the present invention;

[0029] Figure 7 It is a schematic diagram of the fan 1, the chute and the fin structure of the present invention;

[0030] Figure 8 For the present invention Figure 4 A schematic diagram of the structure enlargement in the middle;

[0031] Fig. 9 It is a schematic diagram of the structure of the interlayer bonding reinforcement assembly of the present invention;

[0032] Fig.10 For the present invention Fig. 9 Enlarged schematic diagram of the structure at point B in the middle.

[0033] Description of the numbers in the figure:

[0034] 1. Shell 1; 2. Permanent magnetic slider; 3. Back cover; 31. Through slot; 32. Oblique slot; 4. Joint; 41. Shell 2; 42. Terminal; 5. Waveguide assembly; 51. Outer tube; 52. Sensitive element head; 53. Pulse generating end; 54. Sensing end; 541. Sensing coil; 55. Sensitive assembly; 551. Insulating side plate 1; 552. Insulating side plate 2; 553. Magnetostrictive sheet; 554. Insulating layer; 555. Damping absorber; 56. Interlayer bonding reinforcement assembly; 561. Active slot 1; 562. Wire Rod; 563, movable plate; 564, inclined block 1; 565, pressure plate; 566, inclined block 2; 567, movable groove 2; 568, extension plate; 569, guide column; 57, control board; 6, consumption reduction and vortex reduction part; 61, mounting plate 1; 62, circulation pump; 63, flow channel; 64, pipeline; 65, semiconductor refrigeration part; 7, energy-saving recovery component; 71, piezoelectric element; 72, coupling part; 73, AC / DC conversion part; 74, mounting plate 2; 75, energy storage battery; 76, fan 1; 77, fin; 78, fan 2. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention; it is obvious that the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments, and all other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making creative work are within the scope of protection of the present invention.

[0036] See also Figures 1 to 10 A magnetostrictive linear displacement sensor comprises a housing 1, a waveguide assembly 5 connected to the inside of the housing 1, a permanent magnetic slider 2 (with a permanent magnet installed therein) slidably connected to the outside of the housing 1, a back cover 3 and a joint part 4 respectively fixed to both sides of the housing 1, wherein the joint part 4 comprises a housing 2 41 fixed to one side of the housing 1 and a terminal 42 fixed to one side of the housing 2 41;

[0037] The waveguide component 5 includes an outer tube 51 inserted into the shell 1, a sensitive element head 52 (a connector made of magnetostrictive material) inserted into the outer tube 51, a sensing coil 541 (detection coil) wound around the outside of the sensitive element head 52, a pulse generating end 53 fixedly connected to the inside of the shell 2 41 and connected to the sensitive element head 52, a sensing end 54 fixedly connected to the inside of the shell 2 41 and connected to the sensing coil 541, and a sensitive component 55 inserted into the shell 1 and fixedly connected to one side of the sensitive element head 52;

[0038] The sensitive component 55 includes a limiting portion symmetrically fixed to one side of the sensitive element head 52, a plurality of magnetostrictive sheets 553 inserted in the limiting portion, an insulating layer 554 separating the plurality of magnetostrictive sheets 553 from each other, and a damping absorber 555 located inside the housing 1 and having one side fixed to one side of the plurality of magnetostrictive sheets 553.

[0039] The limiting portion includes two insulating side plates 1 551 symmetrically fixed to one side of the sensitive element head 52 and two insulating side plates 2 552 symmetrically fixed to one side of the sensitive element head 52 .

[0040] One end of the outer tube 51 is inserted into the shell 2 41 , and the sensitive element head 52 , the sensing coil 541 , the pulse generating end 53 and the sensing end 54 are all located inside the shell 2 41 . A control board 57 is also connected inside the shell 2 41 , and the control board 57 is linearly connected to the sensing end 54 and the pulse generating end 53 .

[0041] By adopting the above technical solution, the pulse generating end 53 generates a current pulse, and the current pulse (also called "inquiry signal") runs along the sensitive element head 52 and the magnetostrictive sheet 553 in the outer tube 51 at the speed of sound, thereby generating a circumferential magnetic field outside the waveguide component 5, and the sensitive element head 52 and the magnetostrictive sheet 553 undergo magnetostriction. The magnetic field is coupled with the permanent magnetic field of the permanent magnetic slider 2 to form a "Wiedemann effect" torsional stress wave, which propagates from the generating point to the two ends of the waveguide component 5 at the wave speed, and the torsional wave transmitted to the end is absorbed by the damping absorber 555, and the signal transmitted to the sensitive element head 52 is received by the sensing coil 541 and the sensing end 54. The sensing end 54 calculates the time difference between the current pulse and the signal received by the sensed coil 541 and the sensing end 54, and then multiplies it by the propagation speed of the torsional stress wave in the waveguide material to calculate the torsional stress wave. The distance between the position where the rotation wave occurs and the measurement reference point is measured to realize real-time and accurate measurement of the position of the permanent magnetic slider 2. The measurement principle of the position in the present application is the same as the measurement principle of the magnetostrictive linear displacement sensor in the prior art, so no further details will be given here. However, the waveguide component 5 in the present application is composed of a single sensitive element head 52 and a plurality of magnetostrictive sheets 553. The plurality of magnetostrictive sheets 553 adopt a laminated structure, and an insulating layer 554 (polyimide film or polyester film) is added between the multilayer magnetostrictive sheets 553, which can effectively increase the path resistance of the eddy current, block the formation and expansion of the eddy current, thereby reducing the intensity of the eddy current and the loss of the eddy current, and improving the energy transfer efficiency. Reducing the eddy current means reducing the heat caused by the eddy current, thereby reducing the temperature rise of the waveguide component 5, improving the overall performance and reliability of the system, and enhancing the sensitivity and accuracy of the sensor.

[0042] like Figure 4 and Figure 6As shown, the outer tube 51 is also connected to a consumption reducing and vortex reducing part 6, and the consumption reducing and vortex reducing part 6 includes a mounting plate 61 fixedly connected to the inner wall of the outer tube 51, a circulating pump 62 fixedly connected to one side of the mounting plate 61, a flow channel 63 opened in the outer tube 51, two pipes 64 respectively connecting the output end and the input end of the circulating pump 62 with the two interfaces of the flow channel 63, and a semiconductor refrigeration component 65 fixedly connected to one side of the rear cover 3, and the cold end of the semiconductor refrigeration component 65 is in contact with the outer surface of one of the pipes 64.

[0043] Two through slots 31 are formed inside the rear cover 3 , and the hot end of the semiconductor cooling element 65 is inserted into one of the through slots 31 , and a plurality of fins 77 are fixedly connected to one side of the hot end of the semiconductor cooling element 65 .

[0044] By adopting the above technical solution, the circulating pump 62 can circulate the coolant in the flow channel 63, and cool the coolant in the pipeline 64 through the cold end of the semiconductor refrigeration component 65, which can effectively reduce the temperature of the multiple magnetostrictive sheets 553 located inside the outer tube 51, thereby reducing the flow and loss of eddy currents inside the multiple magnetostrictive sheets 553, and keeping the multiple magnetostrictive sheets 553 working at a lower temperature. This can not only reduce eddy current losses, but also improve the heat dissipation efficiency of the waveguide component 5, and can maintain the electromagnetic properties of the waveguide material stable, thereby maintaining the stable distribution of the electromagnetic field, improving the transmission efficiency and stability of the waveguide component 5, and at the same time reducing material aging and damage caused by high temperature, which helps to extend the service life of the waveguide component 5 and reduce maintenance costs.

[0045] like Figure 1 , Figure 6 and Figure 7 As shown, the outer tube 51 is also connected to an energy-saving recycling assembly 7, and the energy-saving recycling assembly 7 includes a piezoelectric element 71 sleeved on the outside of two insulating side plates 552, two coupling members 72 respectively fixed on both sides of the magnetostrictive sheet 553 (silicone rubber with excellent high and low temperature resistance, good biocompatibility and excellent insulation performance is selected), an AC-DC converter 73 and a mounting plate 74 fixed on the inner wall of the outer tube 51, and an energy storage battery 75 fixed in the mounting plate 74, and one side of the two coupling members 72 is in contact with the inner wall of the piezoelectric element 71, and the positive and negative electrodes of the piezoelectric element 71 are connected to the AC-DC converter 73. The circulating pump 62 and the energy storage battery 75 are both linearly connected to the control board 57.

[0046] A fan 76 is fixedly connected to one side of the rear cover 3, and the air outlet side and the air inlet side of the fan 76 are respectively facing the duct 64 and one of the through slots 31. Two inclined slots 32 connected to the other through slot 31 are symmetrically provided inside the rear cover 3. A fan 2 78 is fixedly connected to the through slot 31 connected to the inclined slot 32, and the air inlet side of the fan 2 78 is facing the fin 77. The fan 1 76 and the fan 2 78 are linearly connected to the energy storage battery 75.

[0047] By adopting the above technical solution, the magnetostrictive sheet 553 will undergo a slight mechanical deformation under the action of the magnetic field. The instantaneous magnetic field generated by the current pulse causes the magnetostrictive sheet 553 to undergo an instantaneous mechanical deformation, generating a mechanical wave. The mechanical wave acts on the piezoelectric element 71 through the coupling member 72, causing the piezoelectric element 71 to undergo mechanical deformation. The piezoelectric element 71 converts the mechanical stress wave into electrical energy and outputs it to the AC / DC converter 73 (the piezoelectric element 71 is formed by combining a piezoelectric material (such as a piezoelectric ceramic sheet) with metal electrodes (positive and negative electrodes) to form a piezoelectric element. When the piezoelectric element is subjected to mechanical stress or electromagnetic induction, it will generate electrical energy, which is output through its electrodes). The AC / DC converter 73 converts the AC power generated by the piezoelectric element 71 into DC power and transmits it to the energy storage battery 7. 5. The energy storage battery 75 stores electric energy and uses the stored electric energy to operate the fan 1 76 and the fan 2 78. The operation of the fan 1 76 and the fan 2 78 can not only speed up the air flow inside the outer tube 51, but also the wind blown by the fan 1 76 can directly cool the pipe 64, so that the coolant in the pipe 64 is cooled by the fan 1 76 and the semiconductor refrigeration element 65, so as to achieve faster cooling of the coolant, and also keep the magnetostrictive sheet 553 at a stable temperature. The fan 1 76 and the fan 2 78 can also achieve rapid cooling of the hot end of the semiconductor refrigeration element 65. The fan 2 78 draws the gas in the outer tube 51 out of the inclined slot 32 and discharges it from the through slot 31. The airflow can take away the heat of the fin 77, thereby ensuring the stable operation of the semiconductor refrigeration element 65.

[0048] like Figure 8 - Fig.10 As shown, the insulating side plate 552 is internally connected with an interlayer bonding reinforcement component 56, and the interlayer bonding reinforcement component 56 includes a movable groove 561 opened in the insulating side plate 552, a movable plate 563 and a pressing plate 565 slidingly connected in the insulating side plate 552, an extension part integrally formed on one side of the movable plate 563, a screw rod 562 rotatably connected in the insulating side plate 552 and screwed in the extension part, an inclined block 564 fixedly connected to one side of the movable plate 563, and an inclined block 566 fixedly connected to one side of the pressing plate 565, and one side of the pressing plate 565 is in contact with one side of the magnetostrictive sheet 553.

[0049] A movable groove 2 567 connected to the movable groove 1 561 is also provided inside the insulating side plate 2 552, and extension plates 568 are fixedly connected on both sides of the pressure plate 565. The extension plates 568 are movably connected in the movable groove 2 567, and a guide column 569 is fixedly connected to the inner wall of the movable groove 2 567. The extension plates 568 are movably sleeved on the outside of the guide column 569.

[0050] By adopting the above technical solution, in order to prevent the joints between the multiple magnetostrictive sheets 553 from becoming the initiation points of fatigue cracks, and to prevent the fatigue cracks from gradually expanding as the working time of the sensor increases and eventually causing the waveguide component 5 to fail, the movable plate 563 can be moved laterally on the insulating side plate 2 552 by rotating the screw rod 562. When the movable plate 563 moves laterally, the inclined block 1 564 below the movable plate 563 can contact the inclined block 2 566. The inclined block 1 564 moves laterally to push the inclined block 2 566 to move longitudinally. The longitudinal movement of the inclined block 2 566 drives the pressing plate 565 to move longitudinally, so that the pressing plate 565 can move in the direction of the magnetostrictive sheet 553. The guide column 569 is used to guide the movement of the extension plate 568 and the pressing plate 565, and to apply pressure to the magnetostrictive sheet 553, so that the connection between the multiple magnetostrictive sheets 553 is tighter, and at the same time, stress concentration can be avoided at the interface between layers to reduce the initiation of fatigue cracks.

[0051] Method of use: The pulse generating end 53 generates a current pulse, and the current pulse (also called "inquiry signal") runs along the sensitive element head 52 and the magnetostrictive sheet 553 in the outer tube 51 at the speed of sound, thereby generating a circumferential magnetic field outside the waveguide component 5, and the sensitive element head 52 and the magnetostrictive sheet 553 undergo magnetostriction. The magnetic field is coupled with the permanent magnetic field of the permanent magnetic slider 2 to form a "Wiedemann effect" torsional stress wave, and the torsional wave propagates from the generating point to the two ends of the waveguide component 5 at the wave speed, and the torsional wave transmitted to the end is absorbed by the damping absorber 555, and the signal transmitted to the sensitive element head 52 is received by the sensing coil 541 and the sensing end 54, and the sensing end 54 calculates the time difference between the current pulse and the signal received by the sensing coil 541 and the sensing end 54 , and then multiplied by the propagation speed of the torsional stress wave in the waveguide material, the distance between the torsional wave occurrence position and the measurement reference point can be calculated, so as to realize the real-time and accurate measurement of the position of the permanent magnetic slider 2. The waveguide component 5 is composed of a single sensitive element head 52 and a plurality of magnetostrictive sheets 553. The plurality of magnetostrictive sheets 553 adopt a laminated structure, and an insulating layer 554 is added between the multilayer magnetostrictive sheets 553 to reduce the intensity and loss of the eddy current. The circulating pump 62 can circulate the coolant in the flow channel 63, and cool the coolant in the pipeline 64 through the cold end of the semiconductor refrigeration component 65, so as to effectively reduce the temperature of the plurality of magnetostrictive sheets 553 located inside the outer tube 51, thereby reducing the flow and loss of the eddy current inside the plurality of magnetostrictive sheets 553.

[0052] The above is only a preferred specific implementation of the present invention; however, the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solution and its improved conception within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A magnetostrictive linear displacement sensor, comprising a housing (1), a waveguide assembly (5) connected to the interior of the housing (1), a permanent magnetic slider (2) slidably connected to the exterior of the housing (1), a rear cover (3) and a joint (4) respectively fixed to both sides of the housing (1), characterized in that: The joint portion (4) comprises a second shell (41) fixedly connected to one side of the first shell (1) and a connection terminal (42) fixedly connected to one side of the second shell (41); The waveguide component (5) comprises an outer tube (51) inserted into the first shell (1), a sensitive element head (52) inserted into the outer tube (51), a sensing coil (541) wound around the outside of the sensitive element head (52), a pulse generating end (53) fixedly connected to the inside of the second shell (41) and connected to the sensitive element head (52), a sensing end (54) fixedly connected to the inside of the second shell (41) and connected to the sensing coil (541), and a sensitive component (55) inserted into the first shell (1) and fixedly connected to one side of the sensitive element head (52); The sensitive component (55) comprises a limiting portion symmetrically fixed to one side of the sensitive element head (52), a plurality of magnetostrictive sheets (553) inserted in the limiting portion, an insulating layer (554) separating the plurality of magnetostrictive sheets (553) from each other, and a damping absorber (555) located inside the first housing (1) and having one side fixed to one side of the plurality of magnetostrictive sheets (553); The limiting portion comprises two insulating side plates 1 (551) symmetrically fixed to one side of the sensitive element head (52) and two insulating side plates 2 (552) symmetrically fixed to one side of the sensitive element head (52); The insulating side plate 2 (552) is internally connected with an interlayer bonding reinforcement component (56), and the interlayer bonding reinforcement component (56) comprises a movable groove 1 (561) provided inside the insulating side plate 2 (552), a movable plate (563) and a pressing plate (565) slidably connected inside the insulating side plate 2 (552), an extension portion integrally formed on one side of the movable plate (563), a screw rod (562) rotatably connected inside the insulating side plate 2 (552) and screwed into the extension portion, an inclined block 1 (564) fixedly connected to one side of the movable plate (563), and an inclined block 2 (566) fixedly connected to one side of the pressing plate (565), and one side of the pressing plate (565) is in contact with one side of the magnetostrictive sheet (553); The second insulating side plate (552) is also provided with a second movable groove (567) connected to the first movable groove (561), and extension plates (568) are fixedly connected to both sides of the pressure plate (565), the extension plates (568) are movably connected in the second movable groove (567), and the inner wall of the second movable groove (567) is fixedly connected with a guide column (569), and the extension plates (568) are movably sleeved on the outside of the guide column (569).

2. The magnetostrictive linear displacement sensor according to claim 1, characterized in that: One end of the outer tube (51) is inserted into the second shell (41), and the sensitive element head (52), the sensing coil (541), the pulse generating end (53) and the sensing end (54) are all located in the second shell (41). A control board (57) is also connected to the second shell (41), and the control board (57) is linearly connected to the sensing end (54) and the pulse generating end (53).

3. The magnetostrictive linear displacement sensor according to claim 2, characterized in that: The outer tube (51) is also connected to a consumption reduction and vortex reduction section (6), and the consumption reduction and vortex reduction section (6) comprises a mounting plate (61) fixedly connected to the inner wall of the outer tube (51), a circulation pump (62) fixedly connected to one side of the mounting plate (61), a flow channel (63) opened inside the outer tube (51), two pipes (64) respectively connecting the output end and the input end of the circulation pump (62) to two interfaces of the flow channel (63), and a semiconductor refrigeration element (65) fixedly connected to one side of the rear cover (3), wherein the cold end of the semiconductor refrigeration element (65) is in contact with the outer surface of one of the pipes (64).

4. The magnetostrictive linear displacement sensor according to claim 3, characterized in that: Two through slots (31) are provided inside the rear cover (3), the hot end of the semiconductor cooling element (65) is inserted into one of the through slots (31), and a plurality of fins (77) are fixedly connected to one side of the hot end of the semiconductor cooling element (65).

5. The magnetostrictive linear displacement sensor according to claim 4, characterized in that: The outer tube (51) is also connected to an energy-saving recycling assembly (7), and the energy-saving recycling assembly (7) comprises a piezoelectric element (71) sleeved on the outside of two insulating side plates (552), two coupling members (72) respectively fixed to the two sides of the magnetostrictive sheet (553), an AC / DC conversion unit (73) and a second mounting plate (74) fixed to the inner wall of the outer tube (51), and an energy storage battery (75) fixed to the second mounting plate (74), and one side of the two coupling members (72) is in contact with the inner wall of the piezoelectric element (71), and the positive and negative electrodes of the piezoelectric element (71) are connected to the AC / DC conversion unit (73).

6. The magnetostrictive linear displacement sensor according to claim 5, characterized in that: A fan 1 (76) is fixedly connected to one side of the rear cover (3), and the air outlet side and the air inlet side of the fan 1 (76) are respectively oriented toward the duct (64) and one of the through slots (31). Two inclined slots (32) connected to the other through slot (31) are symmetrically provided inside the rear cover (3). A fan 2 (78) is fixedly connected to the through slot (31) connected to the inclined slot (32), and the air inlet side of the fan 2 (78) is oriented toward the fin (77). The fan 1 (76) and the fan 2 (78) are linearly connected to the energy storage battery (75).

7. The magnetostrictive linear displacement sensor according to claim 3, characterized in that: The circulation pump (62) and the energy storage battery (75) are both linearly connected to the control board (57).

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