High-precision long-stroke large-gap displacement sensor

Abstract

The invention belongs to the technical field of displacement sensors, and particularly relates to a high-precision long-stroke large-gap displacement sensor which comprises a reading head, a plurality of magnetic sensors and a signal transmission module are linearly arranged in the reading head at equal intervals, the reading head and a measuring rod assembly are arranged in parallel, and a magnet is arranged in the measuring rod assembly. The sensing gap between the reading head and the measuring rod assembly is 10-70 mm, the reading head is connected with a mobile device through the supporting assembly, when the reading head moves along with the mobile device, the magnetic sensor can generate a linearly-changing magnetic field roughly the same as the length of the magnet, and the position change is monitored through analysis of the linear magnetic field, so that the reading head is accurately measured. The magnetic sensors are used for carrying out position detection in a mechanical system so that accurate control can be achieved, the multiple magnetic sensors are linearly arranged and installed in the reading head at equal intervals, displacement analysis can be carried out in long-distance measurement, and under the condition that the induction gap is 10-70 mm, even if a mobile device slightly floats in the moving process, the magnetic sensors can be accurately controlled. And the measurement precision is not influenced.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of displacement sensors, and particularly relates to a high-precision long-stroke large-gap displacement sensor. BACKGROUND

[0002] The existing displacement sensors are mostly contact type displacement measurement, are easy to wear, have a short measurement stroke, and have the defects of poor precision.

[0003] For example, a displacement sensor with patent application number CN202211253945.5, the displacement sensor comprises a main body, an extension rod, an end head and a seam connecting piece, the main body is provided with an extension cavity extending in a first direction, one end of the extension rod is located in the extension cavity, and a protruding part is arranged on the outer wall surface of the one end of the extension rod, the extension rod is movable relative to the main body in the first direction, the end head is arranged in the extension cavity, and the end head can abut against the protruding part to enable the one end of the extension rod to be located in the extension cavity, the seam connecting piece extends in the first direction, and the seam connecting piece is detachably connected between the end head and the main body, but the technical scheme has the defects of contact type displacement measurement, the extension rod is easy to wear, precision is poor, and the measurement stroke is short. SUMMARY

[0004] The application aims to provide a high-precision long-stroke large-gap displacement sensor to solve the problems in the prior art, and the specific technical scheme is as follows:

[0005] A high-precision long-stroke large-gap displacement sensor comprises a reading head, a plurality of magnetic sensors and a signal transmission module are linearly arranged at equal intervals in the reading head, the reading head is arranged in parallel with a measuring rod assembly, a magnet is arranged in the measuring rod assembly, the reading head is fixedly installed with a supporting assembly, an adjusting assembly arranged on the supporting assembly is located at the lower end of the reading head, and the sensing gap between the reading head and the measuring rod assembly is between 10-70 mm.

[0006] Further, the measuring rod assembly comprises a measuring rod shell, one end of the measuring rod shell is provided with a plug-in pipe, the other end of the measuring rod shell is provided with a long slot, adjacent two measuring rod shells are plugged in through the plug-in pipes, the two ends of the plug-in pipes are fixed through fastening screws, the upper end of the plug-in pipes is fixed through a long screw and a nut one, the upper end of the long screw is fixed on a bracket through two nuts two, and a magnet is arranged in the measuring rod shell.

[0007] Further, the support assembly comprises a left support assembly and a right support assembly, the left support assembly and the right support assembly are fixedly installed on both sides of the reading head respectively, the left support assembly and the right support assembly are identical in structure, the left support assembly comprises a support frame one, the support frame one is rotationally connected with a gear rod three, the support frame one is rotationally connected with the adjusting assembly, the gear rod three is in meshing transmission with the adjusting assembly, the gear rod three is internally threadedly connected with an internal screw rod, the internal screw rod is fixedly connected with a support plate one at an upper end, the support plate one is fixedly connected with a support frame two, the support frame two is slidingly connected with the support frame one, the support frame two is internally provided with a protruding block, the support frame two of the left support assembly and the right support assembly is supported on both sides of the reading head respectively, and two protruding blocks are respectively inserted into positioning grooves on both sides of the reading head.

[0008] Further, the adjusting assembly comprises a gear rod one and a gear rod two, the gear rod one is slidingly connected with the gear rod two, the gear rod one is in meshing transmission with the gear rod three in the left support assembly, the gear rod one is rotationally connected with the support frame one in the left support assembly, the gear rod two is in meshing transmission with the gear rod three in the right support assembly, the gear rod two is rotationally connected with the support frame one in the right support assembly, and the gear rod two is fixedly connected with the rotating knob.

[0009] Further, four pulley assembly are arranged on the support frame one, two pulley assemblies are fixed on the support frame one through two groups of adjusting nuts one, and the other two pulley assemblies are fixed on two sliding blocks through two groups of adjusting nuts two respectively, the two sliding blocks are slidingly arranged on the support frame one, the outer side of the support frame one is provided with a scale line one, and a pointer is arranged on the sliding block and the front end of the pointer points to the scale line one.

[0010] Further, the pulley assembly comprises a pulley rod, the pulley rod is fixed on the support frame one through two adjusting nuts one, a bearing is arranged at the rotationally connected position between the pulley rod and the pulley, and the pulley is rotationally connected with the measuring rod shell.

[0011] Further, the front end of the left support assembly is provided with a shovel plate assembly, the shovel plate assembly comprises a shovel plate, the upper end of the shovel plate is rotationally connected with the upper end of the support frame one, the lower end of the shovel plate is slidingly connected with the measuring rod shell, and a torsional spring is arranged at the rotationally connected position between the shovel plate and the support frame one.

[0012] Further, a gap measuring assembly is arranged on the side surface of the support frame two, the gap measuring assembly comprises a rotating wheel one, the rotating wheel one is rotationally connected with the lower end of the measuring rod shell, the rotating wheel one is rotationally connected with a sliding rod, the sliding rod is provided with a scale line two, the sliding rod is slidingly arranged in a support protruding block, the support protruding block is fixed on the support frame two, and a spring is arranged between the lower end of the sliding rod and the support protruding block.

[0013] Further, the left support assembly and the right support assembly are provided with a reading head adapting assembly, the reading head adapting assembly comprises a support frame, a gear two is rotationally connected in the support frame, the gear two is in meshing transmission with two racks on both sides respectively, the two racks are fixed on the two support frames one respectively, the support frame is slidingly connected with a pressing rod, a six-sided column provided in the middle of the pressing rod is inserted into a six-sided slot provided in the gear two, the pressing rod is threadedly connected with an adjusting screw, the adjusting screw is rotationally connected with the support frame, a sliding frame is slidingly connected to the upper end of the support frame, and the middle of the reading head is inserted into the sliding frame.

[0014] The present application has the advantages of:

[0015] 1. The reading head is connected to the mobile device through the support assembly, when the reading head moves with the mobile device, the magnetic sensor generates a linearly changed magnetic field with a length approximately same as that of the magnet, the position change is monitored by analyzing the linear magnetic field, the position detection in the mechanical system using the magnetic sensor can realize accurate control, a plurality of magnetic sensors are installed in the reading head in equidistant linear arrangement, displacement analysis can be performed in long distance measurement, and non-contact feedback is provided, thereby improving the overall reliability and durability.

[0016] 2. The sensing gap between the reading head and the measuring rod assembly is between 10-70mm, large gap measurement is realized, and when the mobile device has slight floating during movement, the measurement accuracy is not affected.

[0017] 3. The present scheme adopts high sensitivity large range magnetic sensors, such as AMR\TMR type magnetic sensors, and large volume magnets, such as N38 magnets, to strengthen the magnetic field strength, realize the gap between the magnetic sensor and the magnet in the range of 10-70mm, and correctly analyze the displacement data, and the gap distance between the protection frame assembly and the reading head is regulated and controlled through the adjusting assembly. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a schematic diagram of the overall structure of the present application Figure 1 ;

[0019] Figure 2 is Figure 1 a partial enlarged view of A in the present application

[0020] Figure 3 is a schematic diagram of the overall structure of the present application Figure 2 ;

[0021] Figure 4 is Figure 3 a partial enlarged view of B in the present application

[0022] Figure 5 is a schematic diagram of the reading head adapting assembly structure of the present application

[0023] Figure 6 Structure diagram of the adjusting assembly of the present application;

[0024] Figure 7 Structure diagram of the adjusting assembly of the present application; Figure 6 Local enlarged view at C;

[0025] Figure 8 Structure diagram of the supporting assembly of the present application Figure 1 ;

[0026] Figure 9 Structure diagram of the supporting assembly of the present application Figure 2 ;

[0027] Figure 10 Structure diagram of the supporting assembly of the present application Figure 3 ;

[0028] Marking description in the figure:

[0029] Measuring rod shell 1; plug pipe 2; long slot 3; sealing ring 4; long screw rod 5; nut one 6; fastening screw 7; support 8; nut two 9; knob 10; gear rod one 11; gear rod two 12; support frame one 13; gear rod three 14; inner screw rod 15; support plate one 16; support frame two 17; protrusion 18; reading head 19; pulley rod 20; bearing 21; pulley 22; adjusting nut one 23; scale line one 24; sliding block 25; adjusting nut two 26; support plate two 27; adjusting screw 28; pointer 29; shovel plate 30; torsional spring 31; rotating wheel one 32; sliding rod 33; support protrusion 34; spring 35; support frame 36; gear two 37; rack 38; pressing rod 39; adjusting screw rod 40; sliding frame 41. DETAILED DESCRIPTION

[0030] The technical solutions of the present application will be described clearly and completely below in combination with the drawings. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work belong to the scope of protection of the present application.

[0031] In the description of the present application, it should be noted that the terms “center”, “upper”, “lower”, “left”, “right”, “vertical”, “horizontal”, “inner”, “outer” and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms “first”, “second”, “third” are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0032] Embodiment one

[0033] As Figures 1-10 shown, a high-precision long-stroke large-gap displacement sensor, comprising a reading head, a plurality of magnetic sensors and a signal transmission module are linearly arranged equidistantly in the reading head, the reading head is arranged in parallel with a measuring rod assembly, a magnet is arranged in the measuring rod assembly, the reading head is fixedly installed with a supporting assembly, an adjusting assembly arranged on the supporting assembly is located at the lower end of the reading head, and the sensing gap between the reading head and the measuring rod assembly is between 10-70mm.

[0034] The working principle of the above technical solution is as follows: the reading head 19 is connected to the mobile device through the supporting assembly, when the reading head 19 moves with the mobile device, the magnetic sensor will generate a linearly changed magnetic field with a length approximately the same as that of the magnet, the position change is monitored by analyzing the linear magnetic field, the position detection in the mechanical system using the magnetic sensor can realize accurate control, a plurality of magnetic sensors are linearly arranged equidistantly in the reading head, displacement analysis can be performed in long-distance measurement, and non-contact feedback is provided, thereby improving the overall reliability and durability.

[0035] The sensing gap between the reading head and the measuring rod assembly is between 10-70mm, large-gap measurement is realized, and when the mobile device has slight floating during movement, the measurement accuracy will not be affected.

[0036] Further, when performing displacement analysis, first, the influence analysis is performed according to the gap distance, and the effective air gap estimation field degradation calculation is performed through the following formula:

[0037]

[0038] Wherein, Field x is the effective air gap estimation field degradation data, B r is the residual magnetic induction in the supporting assembly, and the unit is G; L is the length of the magnet, and the unit is mm; X is the gap distance, and the unit is mm; R is the radius of the magnet, and the unit is mm, and then the magnetic sensor is based on the effective air gap estimation field degradation data Field xThe size of the magnetic steel is calculated. In the case that the interval S between the magnetic sensor arrays and the size of the magnetic steel are selected, only four magnetic sensors in the magnetic sensor array are affected by the magnetic field and the other magnetic sensors are not affected. The magnetic sensors that are affected are sequentially recorded as action magnetic sensor one, action magnetic sensor two, action magnetic sensor three, and action magnetic sensor four. Then, the adaptive gap algorithm is used to analyze the data processing characteristics according to the output data of the action magnetic sensors. Through experimental analysis, it is determined that, in the case that the magnetic steel gap is constant, only the action magnetic sensor one and the action magnetic sensor four have the best stability of the first error factor calculated when the magnetic steel moves. In order to ensure the stability of the first error factor of the magnetic sensor, the error compensation analysis of the magnetic sensor is performed according to the action magnetic sensor one and the action magnetic sensor four through the following formula, and the first error factor of the magnetic sensor is obtained:

[0039] HI_VAL1=abs(ADdata1)+abs(AD16data4)

[0040] HI_VAL2=acos(AD16data1 / 1000)*450+acos(-AD16data4] / 1000)*450

[0041] HI_VAL=HI_VAL2+HI_VAL1-1000

[0042] GD_XSHU=-0.4028+4.89e-3*HI_VAL-1.287e-5*HI_VAL*HI_VAL+1.741e-8

[0043] *HI_VAL*HI_VAL*HI_VAL

[0044] wherein ADdata1 is the magnetic field change data value output by the action magnetic sensor one under the influence of the magnetic steel; ADdata4 is the magnetic field change data value output by the action magnetic sensor four under the influence of the magnetic steel; HI_VAL1 is the first intermediate quantity; HI_VAL2 is the second intermediate quantity; HI_VAL is the characteristic value; and GD_XSHU is the first error factor of the magnetic sensor. Then, the output value of the magnetic sensor in the ideal state is obtained, and the ideal output value of the action magnetic sensor is obtained. The ideal output value of the action magnetic sensor is combined with the actual output value of the action magnetic sensor to determine the sensitivity error of the magnetic sensor. At the same time, the offset error of the action magnetic sensor is obtained based on the magnetic field condition. Therefore, the error of the action magnetic sensor is analyzed according to the offset and sensitivity of the action magnetic sensor through the following formula, and the second error factor of the action magnetic sensor is obtained:

[0045] output of sensor = Hallideal + (Hallideal x errorsensitivity / 100) + offseterror

[0046] Hallideal is the ideal output value of the motion magnetic sensor; errorsensitivity is the sensitivity error of the motion magnetic sensor; offseterror is the offset error of the motion magnetic sensor; and output of sensor is the second error factor of the motion magnetic sensor.

[0047] Next, the output data of the motion magnetic sensor is corrected by x = ADdata / GD_XSHU / output of sensor using the first error factor of the motion magnetic sensor and the second error factor of the motion magnetic sensor, where x is the corrected output data of the motion magnetic sensor, ADdata is the output data of the motion magnetic sensor, GD_XSHU is the first error factor of the motion magnetic sensor, and output of sensor is the second error factor of the motion magnetic sensor; then the corrected output data x of the motion magnetic sensor is fitted to the corresponding displacement using MATLAB, and the displacement is analyzed using the MacQuart method and the general global optimization method to obtain displacement analysis data. When the corrected output data of the motion magnetic sensor is fitted to the corresponding displacement using MATLAB, it is found that multiple motion sensor data points are difficult to regress to a curve, resulting in a large deviation, and the output data of three groups of motion magnetic sensors is best for fitting, therefore, when fitting formulae are obtained by fitting and analyzing the output data of multiple motion magnetic sensors using MATLAB, the output data of the first motion magnetic sensor, the output data of the second motion magnetic sensor, and the output data of the third motion magnetic sensor are selected from the output data of the motion magnetic sensor for subdivided displacement fitting, and the corresponding subdivided displacement fitted for the output data of the first motion magnetic sensor, the output data of the second motion magnetic sensor, and the output data of the third motion magnetic sensor is as follows: y1 is the fitting result of the subdivided displacement value, the resolution of which is 0.01 millimeter, x1 is the output data of the first motion magnetic sensor, x2 is the output data of the second motion magnetic sensor, and x3 is the output data of the third motion magnetic sensor; and total displacement analysis and calculation are performed according to Y = y1 + N*S, where Y is the total displacement of the magnetic steel moving on the magnetic sensor array, y1 is the fitting result of the subdivided displacement value, N is the number of the largest motion magnetic sensor, and S is the spacing of the magnetic sensor array.

[0048] The above only corrects the action magnetic sensor data, other sensors have no action and no use in calculation, so no calibration is needed, and the influence of gap distance on displacement error and the influence of action magnetic sensor itself on displacement error are fully considered through the analysis of the first error of action magnetic sensor and the second error of action magnetic sensor, so that the first error factor of action magnetic sensor and the second error factor of action magnetic sensor are used for correction in displacement analysis, the error of different action magnetic sensors is eliminated through the second error factor, the accuracy of action magnetic sensor output data is unified, the error of action magnetic sensor output data in displacement analysis process is effectively reduced, and the accuracy of displacement analysis is ensured.

[0049] The scheme adopts high-sensitivity large-range magnetic sensors, such as AMR\TMR type magnetic sensors, and uses large-volume magnets to strengthen the magnetic field strength, such as N38 magnets, to realize the gap between the magnetic sensor and the magnet in the range of 10-70 mm, which can correctly analyze the displacement data, and the gap distance between the protection frame assembly and the reading head 19 is adjusted and controlled through the adjusting assembly.

[0050] Embodiment two

[0051] As shown in Figures 1-10 , the measuring rod assembly comprises a measuring rod shell 1, one end of the measuring rod shell 1 is provided with a plug-in pipe 2, the other end of the measuring rod shell 1 is provided with a long slot 3, two adjacent measuring rod shells 1 are plugged through the plug-in pipe 2, the two ends of the plug-in pipe 2 of the two adjacent measuring rod shells 1 are fixed through fastening screws 7, the upper end of the plug-in pipe 2 of the two adjacent measuring rod shells 1 is fixed through a long screw 5 and a nut 1 6, the upper end of the long screw 5 is fixed on a support 8 through two nuts 2 9, and a magnet is arranged in the measuring rod shell 1.

[0052] The working principle of the above technical scheme is as follows: the installation mode of the two adjacent measuring rod shells 1 is that the long screw 5 is inserted into the plug-in pipe 2 of the right measuring rod shell 1 from the right side and then is pulled out from the upper end, the plug-in pipe 2 of the right measuring rod shell 1 is inserted into the long slot 3 of the left measuring rod shell 1, the long screw 5 is inserted into the long slot 3, the plug-in pipe 2 of the right measuring rod shell 1 and the long slot 3 of the left measuring rod shell 1 are fixed through the nut 1 6, the two ends of the plug-in pipe 2 of the two adjacent measuring rod shells 1 are fixed through the fastening screws 7, the upper end of the long screw 5 is fixed on the support 8 through the two nuts 2 9, and a plurality of measuring rod shells 1 are fixed and connected through the above mode, so that a plurality of measuring rod shells 1 are fixed and connected, a plurality of magnetic sensors are linearly arranged at equal intervals in the long pipe formed by the plurality of measuring rod shells 1, and long-stroke displacement measurement is realized.

[0053] A sealing ring 4 is arranged between the two adjacent measuring rod shells 1, which prevents rainwater from entering the measuring rod shell 1 and prevents the magnetic sensor from being damaged by contacting with rainwater, thereby prolonging the service life of the magnetic sensor.

[0054] Example 3

[0055] like Figures 1-10 As shown, the support assembly includes a left support assembly and a right support assembly. The left support assembly and the right support assembly are respectively fixedly installed on both sides of the reading head 19. The left support assembly and the right support assembly have the same structure. The left support assembly includes a support frame 13, which is rotatably connected to a gear rod 14. The support frame 13 is rotatably connected to an adjustment assembly. The gear rod 14 meshes with the adjustment assembly. The gear rod 14 is internally threaded with an internal screw 15. A support plate 16 is fixed at the upper end of the internal screw 15. The support plate 16 is fixedly connected to a support frame 17. The support frame 17 is slidably connected to the support frame 13. The support frame 17 is provided with a protrusion 18. The support frame 17 in the left support assembly and the right support assembly are respectively supported on both sides of the reading head 19. The two protrusions 18 are respectively inserted into the positioning grooves on both sides of the reading head 19.

[0056] The working principle of the above technical solution is as follows: the gear rod 14 in the left support assembly and the right support assembly rotates synchronously by adjusting the component, which drives the two internal screw rods 15 to rise or fall, drives the two support plates 16 to rise or fall, drives the two support frames 17 to rise or fall, and then drives the reading head 19 to rise or fall, thereby changing the distance between the magnet and the magnetic sensor. It can be adjusted according to actual needs.

[0057] Example 4

[0058] like Figures 1-10 As shown, the adjustment assembly includes a gear rod 11 and a gear rod 12. Gear rod 11 and gear rod 12 are slidably connected. Gear rod 11 meshes with gear rod 3 14 in the left support assembly. Gear rod 11 is rotatably connected with support frame 13 in the left support assembly. Gear rod 12 meshes with gear rod 3 14 in the right support assembly. Gear rod 12 is rotatably connected with support frame 13 in the right support assembly. Gear rod 12 is fixedly connected to the knob 10.

[0059] The working principle of the above technical solution is as follows: Rotating the knob 10 drives the gear rod 12 to rotate, which in turn drives the gear rod 11 to rotate, which in turn drives the two gear rods 14 to rotate synchronously, which in turn drives the two support plates 16 to rise or fall synchronously, which in turn drives the two support frames 17 to rise or fall synchronously, which in turn drives the reading head 19 to rise or fall. Because the two ends of the reading head 19 move synchronously, the reading head 19 rises or falls smoothly.

[0060] Example 5

[0061] like Figures 1-10As shown, the support frame 13 is provided with four pulley assemblies, two of which are fixed to the support frame 13 by two sets of adjusting nuts 23, and the other two pulley assemblies are fixed to two sliders 25 by two sets of adjusting nuts 26 respectively. Both sliders 25 slide on the support frame 13. The outer side of the support frame 13 is provided with a scale line 24, and the sliders 25 are provided with a pointer 29, the front end of which points to the scale line 24.

[0062] The pulley assembly includes a pulley rod 20, which is fixed to the support frame 13 by two adjusting nuts 23. A bearing 21 is provided at the rotatable connection between the pulley rod 20 and the pulley 22. The pulley 22 is rotatably connected to the measuring rod housing 1.

[0063] The working principle of the above technical solution is as follows: During the movement of the reading head 19, the measuring rod housing 1 rises and the reading head 19 rises accordingly; when the measuring rod housing 1 falls, the reading head 19 falls accordingly, ensuring that the gap between the reading head 19 and the measuring rod housing 1 remains fixed at all times, thus ensuring the accuracy of the measurement.

[0064] By adjusting two sets of adjusting nuts 23 and two sets of adjusting nuts 26, the distance between the pulley 22 and the inner wall of the support frame 13 is changed, thereby adapting to measuring rod housings 1 of different widths;

[0065] By rotating the adjusting screw 28, the support plate 27 is raised or lowered, the slider 25 slides on the support frame 13, and the pulley assembly inside the slider 25 is raised or lowered, thereby adapting to the measuring rod housing 1 of different heights;

[0066] The slider 25 is equipped with a pointer 29. The pointer 29 can be used to measure the specific height of the measuring rod housing 1 by pointing to the specific graduation on the scale line 24.

[0067] Example 6

[0068] like Figures 1-10 As shown, the front end of the left support assembly is provided with a shovel plate assembly, which includes a shovel plate 30. The upper end of the shovel plate 30 is rotatably connected to the upper end of the support frame 13, and the lower end of the shovel plate 30 is slidably connected to the measuring rod housing 1. A torsion spring 31 is provided at the rotatable connection between the shovel plate 30 and the support frame 13.

[0069] The working principle of the above technical solution is as follows: the scraper plate 30 can scrape off the dust and other impurities on the upper end of the measuring rod housing 1, preventing the pulley 22 from being affected when rotating on the measuring rod housing 1. The width of the measuring rod housing 1 is larger than the width of the reading head 19, and the reading head 19 is set at the lower end of the measuring rod housing 1, which can effectively reduce rainwater and dust falling between the measuring rod housing 1 and the reading head 19, thereby improving the accuracy of displacement measurement.

[0070] Example 7

[0071] As shown in Figures 1-10 The support frame two 17 side is provided with a gap measurement assembly, the gap measurement assembly comprises a rotating wheel one 32, the rotating wheel one 32 is rotatably connected at the lower end of the measuring rod shell 1, the rotating wheel one 32 is rotatably connected with a sliding rod 33, the sliding rod 33 is provided with a second scale line, the sliding rod 33 is slidably arranged in a support protrusion 34, the support protrusion 34 is fixed on the support frame two 17, and the spring 35 is arranged between the lower end of the sliding rod 33 and the support protrusion 34;

[0072] The working principle of the above technical scheme is that the upper end of the rotating wheel one 32 abuts against the lower end of the measuring rod shell 1, and the scale position of the second scale line on the sliding rod 33 corresponding to the support protrusion 34 is the gap distance between the measuring rod shell 1 and the reading head 19; when the distance between the measuring rod shell 1 and the reading head 19 is adjusted to be smaller, the measuring rod shell 1 extrudes the rotating wheel one 32 to move downward, drives the sliding rod 33 to move downward, drives the spring 35 to be stretched, and drives the support protrusion 34 to correspond to the scale value of the second scale line on the sliding rod 33 to be reduced;

[0073] Since the rotating wheel one 32 is rotatably connected at the lower end of the measuring rod shell 1, even if the reading head 19 is moved, the gap can be adjusted, and the gap value can be measured and displayed, which is flexible and convenient.

[0074] Embodiment eight

[0075] As shown in Figures 1-10 The left support assembly and the right support assembly are provided with a reading head adapting assembly, the reading head adapting assembly comprises a support frame 36, a gear two 37 is rotatably connected in the support frame 36, the gear two 37 is in meshing transmission with two racks 38 on both sides, the two racks 38 are respectively fixed on the two support frames one 13, the support frame 36 is slidably connected with a pressing rod 39, a hexagonal column provided in the middle of the pressing rod 39 is inserted into a hexagonal groove provided in the gear two 37, the pressing rod 39 is in threaded connection with an adjusting screw 40, the adjusting screw 40 is in rotatable connection with the support frame 36, a sliding frame 41 is slidably connected to the upper end of the support frame 36, and the reading head 19 is inserted into the sliding frame 41;

[0076] The working principle of the above technical scheme is that the adjusting screw 40 is rotated, the pressing rod 39 is driven to move upward, the hexagonal column provided in the middle of the pressing rod 39 is driven to move upward, the hexagonal column is moved out of the hexagonal groove provided in the gear two 37, the gear two 37 is rotated, the two racks 38 are driven to move in opposite directions, the left support assembly and the right support assembly are driven to move in opposite directions, the two protrusions 18 are driven to be separated from the positioning grooves at both ends of the reading head 19, the two support frames two 17 are driven to be separated from both ends of the reading head 19, the sliding frame 41 is pulled outward, the reading head 19 is driven to move outward, and then the reading head 19 is moved to the outside of the measuring rod shell 1, so that the reading head 19 can be overhauled or pulled out to be replaced;

[0077] After the reading head 19 is repaired or replaced, the reading head 19 is moved to the lower end of the measuring rod shell 1 again, the gear two 37 is rotated in the opposite direction, the two racks 38 are moved in the similar direction, the left support assembly and the right support assembly are moved in the similar direction, the two protrusions 18 are respectively inserted into the positioning grooves at the two ends of the reading head 19, the two support frames two 17 are respectively abutted against the two ends of the reading head 19, and then the reading head 19 is fixed below the measuring rod shell 1, so that the reading head 19 is convenient to move, repair or replace, and the reading head 19 with large weight is particularly suitable;

[0078] The support frame one 13 and the support frame 36 can be fixed on the mobile device, the positioning long slot is arranged on the support frame one 13, and the screw can be fixed with the mobile device through the positioning long slot, when the distance between the two support frame ones 13 needs to be adjusted, the screw can be loosened, and the support frame one 13 is adjusted by sliding on the mobile device.

[0079] Since the distance between the left support assembly and the right support assembly can be adjusted, that is, the distance between the two support frame ones 13 can be adjusted, and the distance between the support frames two 17 can be adjusted, the reading head 19 with different lengths can be matched.

[0080] It can be understood that the present application is described through some embodiments, and those skilled in the art know that various changes or equivalent replacements can be made to the features and embodiments without departing from the spirit and scope of the present application. In addition, the features and embodiments can be modified to adapt to specific conditions and materials under the guidance of the present application without departing from the spirit and scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of the present application belong to the scope of protection of the present application.

Claims

1. A high-precision long-stroke large-gap displacement sensor characterized by comprising: The reading head (19) is provided with a plurality of magnetic sensors and signal transmission modules arranged in equidistant linear arrangement, the reading head (19) is arranged in parallel with the measuring rod assembly, the measuring rod assembly is provided with a magnet, the reading head (19) is fixedly installed on the supporting assembly, the adjusting assembly arranged on the supporting assembly is located at the lower end of the reading head (19), and the sensing gap between the reading head (19) and the measuring rod assembly is 10-70 mm.

2. The high-precision long-stroke large-gap displacement sensor according to claim 1, characterized in that, The measuring rod assembly comprises a measuring rod shell (1), one end of the measuring rod shell (1) is provided with a plug-in pipe (2), the other end of the measuring rod shell (1) is provided with a long slot (3), two adjacent measuring rod shells (1) are plugged through the plug-in pipe (2), the two ends of the plug-in pipe (2) are fixed through fastening screws (7), the upper end of the plug-in pipe (2) is fixed through a long screw (5) and a nut (6), the upper end of the long screw (5) is fixed on a support (8) through two nuts (9), and the measuring rod shell (1) is provided with a magnet.

3. The high-precision long-stroke large-gap displacement sensor according to claim 2, characterized by, The supporting assembly comprises a left supporting assembly and a right supporting assembly, the left supporting assembly and the right supporting assembly are fixedly installed on the two sides of the reading head (19) respectively, the left supporting assembly comprises a supporting frame (13), the supporting frame (13) is rotatably connected with a gear rod (14), the supporting frame (13) is rotatably connected with the adjusting assembly, the gear rod (14) is in meshing transmission with the adjusting assembly, the gear rod (14) is threadedly connected with an inner screw rod (15), the upper end of the inner screw rod (15) is fixedly provided with a supporting plate (16), the supporting plate (16) is fixedly connected with a supporting frame (17), the supporting frame (17) is slidably connected with the supporting frame (13), the supporting frame (17) is provided with a protruding block (18), the supporting frame (17) of the left supporting assembly and the right supporting assembly is supported on the two sides of the reading head (19) respectively, and the two protruding blocks (18) are plugged into the positioning slots on the two sides of the reading head (19) respectively.

4. The high-precision long-stroke large-gap displacement sensor according to claim 3, characterized by, The adjusting assembly comprises a gear rod (11) and a gear rod (12), the gear rod (11) is slidably connected with the gear rod (12), the gear rod (11) is in meshing transmission with the gear rod (14) in the left supporting assembly, the gear rod (11) is rotatably connected with the supporting frame (13) in the left supporting assembly, the gear rod (12) is in meshing transmission with the gear rod (14) in the right supporting assembly, the gear rod (12) is rotatably connected with the supporting frame (13) in the right supporting assembly, and the gear rod (12) is fixedly connected with a rotating knob (10).

5. The high-precision long-stroke large-gap displacement sensor according to claim 4, characterized by, Four pulley assemblies are arranged on the supporting frame (13), two pulley assemblies are fixed on the supporting frame (13) through two groups of adjusting nuts (23), the other two pulley assemblies are fixed on two sliding blocks (25) through two groups of adjusting nuts (26), the two sliding blocks (25) are slidably arranged on the supporting frame (13), the outer side of the supporting frame (13) is provided with a scale line (24), the sliding block (25) is provided with a pointer (29), and the front end of the pointer (29) points to the scale line (24).

6. The high-precision long-stroke large-gap displacement sensor according to claim 5, characterized by The pulley assembly comprises a pulley rod (20) fixed on the support frame I (13) through two adjusting nuts I (23), the pulley rod (20) is rotatably connected with the pulley (22) and is provided with a bearing (21) at the rotatable connection, and the pulley (22) is rotatably connected with the measuring rod shell (1).

7. The high-precision long-stroke large-gap displacement sensor according to claim 6, characterized by The left support assembly is provided with a shovel plate assembly at the front end, the shovel plate assembly comprises a shovel plate (30), the upper end of the shovel plate (30) is rotatably connected with the upper end of the support frame I (13), the lower end of the shovel plate (30) is slidably connected with the measuring rod shell (1), and the rotatable connection between the shovel plate (30) and the support frame I (13) is provided with a torsional spring (31).

8. The high-precision long-stroke large-gap displacement sensor according to claim 7, characterized by, The support frame II (17) is provided with a gap measuring assembly on the side, the gap measuring assembly comprises a rotating wheel I (32), the rotating wheel I (32) is rotatably connected with the lower end of the measuring rod shell (1), the rotating wheel I (32) is rotatably connected with a sliding rod (33), the sliding rod (33) is provided with a second scale line, the sliding rod (33) slides in a supporting block (34), the supporting block (34) is fixed on the support frame II (17), and the lower end of the sliding rod (33) and the supporting block (34) are provided with a spring (35).

9. The high-precision long-stroke large-gap displacement sensor according to claim 8, characterized by, The left support assembly and the right support assembly are provided with a reading head adapting assembly, the reading head adapting assembly comprises a support frame (36), the support frame (36) is rotatably connected with a gear II (37) inside, the gear II (37) is in meshing transmission with two racks (38) on both sides, the two racks (38) are fixed on the two support frames I (13) respectively, the support frame (36) is slidably connected with a pressing rod (39), the six-edge column provided in the middle of the pressing rod (39) is inserted into the six-edge groove provided in the gear II (37), the pressing rod (39) is screwedly connected with an adjusting screw rod (40), the adjusting screw rod (40) is rotatably connected with the support frame (36), the upper end of the support frame (36) is slidably connected with a sliding frame (41), and the middle part of the reading head (19) is inserted into the sliding frame (41).

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