A high-precision long-stroke large-gap displacement sensor

Abstract

The application 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 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, an induction gap between the reading head and the measuring rod assembly is 10-70 mm, the reading head is connected with a moving device through a supporting assembly, when the reading head moves along with the moving device, the magnetic sensors generate a linearly changed magnetic field which is substantially the same as the length of the magnet, the position change is monitored by analyzing the linear magnetic field, the position detection in the mechanical system by using the magnetic sensors can realize accurate control, the plurality of magnetic sensors are linearly arranged at equal intervals in the reading head, displacement analysis can be carried out in long-distance measurement, and even if the moving device slightly floats during movement, the measurement accuracy will not be affected when the induction gap is 10-70 mm.

Description

Technical Field

[0001] This invention belongs to the field of displacement sensor technology, and particularly relates to a high-precision, long-stroke, large-gap displacement sensor. Background Technology

[0002] Existing displacement sensors are mostly contact-type motion measurement sensors, which are prone to wear and have short measurement strokes, resulting in poor accuracy.

[0003] For example, the displacement sensor with patent application number CN202211253945.5 includes a main body, a telescopic rod, an end, and a seam connector. The main body has a telescopic cavity extending in a first direction. One end of the telescopic rod is located in the telescopic cavity, and a protrusion is provided on the outer wall surface of one end of the telescopic rod. The telescopic rod can move relative to the main body in the first direction. The end is located in the telescopic cavity and can stop the protrusion so that one end of the telescopic rod is located in the telescopic cavity. The seam connector extends in the first direction and is detachably connected between the end and the main body. However, the disadvantage of this technical solution is that it is a contact-type moving measurement, the telescopic rod is prone to wear, which can easily lead to poor accuracy, and it also has the disadvantage of a short measurement stroke. Summary of the Invention

[0004] The purpose of this invention is to provide a high-precision, long-stroke, large-gap displacement sensor to solve the problems in the prior art. The specific technical solution is as follows:

[0005] A high-precision, long-stroke, large-gap displacement sensor includes a reading head, in which multiple magnetic sensors and a signal transmission module are arranged linearly at equal intervals. The reading head is arranged parallel to a measuring rod assembly, which contains a magnet. The reading head is fixedly installed to a support assembly, and an adjustment component on the support assembly is located at the lower end of the reading head. The sensing gap between the reading head and the measuring rod assembly is between 10 and 70 mm.

[0006] Furthermore, the measuring rod assembly includes a measuring rod housing, one end of which is provided with a connector, and the other end of which is provided with a long groove. Adjacent measuring rod housings are connected by connectors, and the two ends of the connection between adjacent measuring rod housings are fixed by fastening screws. The upper ends of the connection between adjacent measuring rod housings are fixed by a long screw and a nut, and the upper end of the long screw is fixed to a bracket by two nuts. A magnet is provided inside the measuring rod housing.

[0007] Furthermore, the support assembly includes a left support assembly and a right support assembly, which are respectively fixedly installed on both sides of the reading head. The left and right support assemblies have the same structure. The left support assembly includes a support frame one, which is rotatably connected to a gear rod three and a regulating assembly. The gear rod three meshes with the regulating assembly. The gear rod three is internally threaded with an internal screw. A support plate one is fixedly attached to the upper end of the internal screw. The support plate one is fixedly connected to a support frame two, and the support frame two is slidably connected to the support frame one. The support frame two has protrusions inside. The support frame two in the left and right support assemblies are respectively supported on both sides of the reading head, and the two protrusions are respectively inserted into the positioning grooves on both sides of the reading head.

[0008] Furthermore, the adjustment assembly includes gear rod one and gear rod two, gear rod one and gear rod two are slidably connected, gear rod one meshes with gear rod three in the left support assembly, gear rod one is rotatably connected with support frame one in the left support assembly, gear rod two meshes with gear rod three in the right support assembly, gear rod two is rotatably connected with support frame one in the right support assembly, and gear rod two is fixedly connected to the knob.

[0009] Furthermore, the support frame 1 is provided with four pulley assemblies, two of which are fixed to the support frame 1 by two sets of adjusting nuts 1, and the other two pulley assemblies are fixed to two sliders respectively by two sets of adjusting nuts 2. Both sliders slide on the support frame 1. The support frame 1 is provided with a scale line 1 on its outer side, and the slider is provided with a pointer, the front end of which points to the scale line 1.

[0010] Furthermore, the pulley assembly includes a pulley rod, which is fixed to the support frame by two adjusting nuts. A bearing is provided at the rotatable connection between the pulley rod and the pulley, and the pulley is rotatably connected to the measuring rod housing.

[0011] Furthermore, the front end of the left support assembly is provided with a shovel plate assembly, which includes a shovel plate. The upper end of the shovel plate is rotatably connected to the upper end of the support frame, and the lower end of the shovel plate is slidably connected to the housing of the measuring rod. A torsion spring is provided at the rotatable connection between the shovel plate and the support frame.

[0012] Furthermore, a gap measuring assembly is installed on both sides of the support frame. The gap measuring assembly includes a first rotating wheel, which is rotatably connected to the lower end of the measuring rod housing. The first rotating wheel is rotatably connected to a slide rod, which is provided with a second scale line. The slide rod slides inside the support protrusion, which is fixed on the second support frame. A spring is provided between the lower end of the slide rod and the support protrusion.

[0013] Furthermore, a reading head adapter assembly is provided between the left support assembly and the right support assembly. The reading head adapter assembly includes a support frame, in which a second gear is rotatably connected. The two sides of the second gear mesh with two racks respectively, and the ends of the two racks are fixed on two support frames. The support frame is slidably connected to the pressure rod. A hexagonal column in the middle of the pressure rod is inserted into a hexagonal groove in the second gear. The pressure rod is threadedly connected to an adjusting screw, which is rotatably connected to the support frame. A slide is slidably connected to the upper end of the support frame, and the middle of the reading head is inserted into the slide.

[0014] The advantages of this invention are:

[0015] 1. The reading head is connected to the mobile device via a support assembly. When the reading head moves with the mobile device, the magnetic sensor generates a magnetic field that changes linearly with the length of the magnet. By analyzing the linear magnetic field, position changes are monitored. Precise control can be achieved by using magnetic sensors for position detection in mechanical systems. Multiple magnetic sensors are equidistantly and linearly arranged inside the reading head, enabling displacement analysis over longer distances and providing non-contact feedback, thus improving overall reliability and durability.

[0016] 2. The sensing gap between the reading head and the measuring rod assembly is between 10-70 mm, enabling large-gap measurement. Even if the mobile device floats slightly during movement, it will not affect the measurement accuracy.

[0017] 3. This solution uses a high-sensitivity, wide-range magnetic sensor, such as an AMR or TMR model magnetic sensor, and a large magnet to enhance the magnetic field strength, such as an N38 magnet. The gap between the magnetic sensor and the magnet is in the range of 10-70 mm, and the displacement data can be correctly interpreted. The gap between the protective frame assembly and the reading head can be adjusted by adjusting the component. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention. Figure 1 ;

[0019] Figure 2 for Figure 1 Enlarged view of a portion of point A in the middle;

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

[0021] Figure 4 for Figure 3 Enlarged view of a section at point B in the middle;

[0022] Figure 5 This is a schematic diagram of the reading head adapter component structure of the present invention;

[0023] Figure 6 This is a schematic diagram of the adjustment component structure of the present invention;

[0024] Figure 7 for Figure 6 Enlarged view of a section at point C;

[0025] Figure 8 This is a schematic diagram of the support component structure of the present invention. Figure 1 ;

[0026] Figure 9 This is a schematic diagram of the support component structure of the present invention. Figure 2 ;

[0027] Figure 10 This is a schematic diagram of the support component structure of the present invention. Figure 3 ;

[0028] Explanation of markings in the diagram:

[0029] 1. Measuring rod housing; 2. Insert pipe; 3. Long groove; 4. Sealing ring; 5. Long screw; 6. Nut 1; 7. Fastening screw; 8. Bracket; 9. Nut 2; 10. Knob; 11. Gear rod 1; 12. Gear rod 2; 13. Support frame 1; 14. Gear rod 3; 15. Internal screw; 16. Support plate 1; 17. Support frame 2; 18. Protrusion; 19. Reading head; 20. Pulley rod; 21. Bearing; 22. Pulley; 23. Adjusting nut 1; 24. Scale line 1; 25. Slider; 26. Adjusting nut 2; 27. Support plate 2; 28. Adjusting screw; 29. ​​Pointer; 30. Shovel plate; 31. Torsion spring; 32. Rotating wheel 1; 33. Slide rod; 34. Support protrusion; 35. Spring; 36. Support frame; 37. Gear 2; 38. Rack; 39. Pressure rod; 40. Adjusting screw; 41. Slide. Detailed Implementation

[0030] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0032] Example 1

[0033] like Figures 1-10 As shown, a high-precision long-stroke large-gap displacement sensor includes a reading head, in which multiple magnetic sensors and signal transmission modules are arranged linearly at equal intervals. The reading head is arranged parallel to the measuring rod assembly, and a magnet is provided in the measuring rod assembly. The reading head is fixedly installed with a support assembly, and an adjustment component is provided on the support assembly at the lower end of the reading head. The sensing gap between the reading head and the measuring rod assembly is between 10-70 mm.

[0034] The working principle of the above technical solution is as follows: The reading head 19 is connected to the mobile device through the support assembly. When the reading head 19 moves with the mobile device, the magnetic sensor generates a magnetic field that changes linearly with the length of the magnet. By analyzing the linear magnetic field, the position change is monitored. Using the magnetic sensor to perform position detection in the mechanical system can achieve precise control. Multiple magnetic sensors are equidistantly and linearly arranged in the reading head, which can perform displacement analysis in long-distance measurements and provide non-contact feedback, thus improving the overall reliability and durability.

[0035] The sensing gap between the reading head and the measuring rod assembly is between 10-70 mm, enabling large-gap measurement. Even if the mobile device floats slightly during movement, it will not affect the measurement accuracy.

[0036] Furthermore, during displacement analysis, the influence of the gap distance is first analyzed, and the degradation of the effective air gap estimation field is calculated using the following formula:

[0037]

[0038] in, To obtain effective air gap estimation field degradation data, The unit of measurement for residual magnetic induction in the component is G; This refers to the length of the magnet, expressed in mm. This refers to the gap distance, and its unit is mm; The radius of the magnet is given in mm, and the field degradation data of the magnetic sensor is estimated based on the effective air gap. A suitable magnet size was calculated. Given a selected spacing S between the magnetic sensor arrays and the magnet size, only four magnetic sensors in the array activated due to the magnetic field, while the others remained inactive. These activated sensors were designated as Activated Magnetic Sensor 1, Activated Magnetic Sensor 2, Activated Magnetic Sensor 3, and Activated Magnetic Sensor 4 in sequence. Then, an adaptive gap algorithm was used to process and analyze the output data of the activated magnetic sensors. Experimental analysis determined that, under a fixed magnet gap, only Activated Magnetic Sensor 1 and Activated Magnetic Sensor 4 showed the best stability in calculating the first error factor when moving the magnet. To ensure the stability of the first error factor, error compensation analysis was performed based on Activated Magnetic Sensor 1 and Activated Magnetic Sensor 4 using the following formula to obtain the first error factor of the magnetic sensors:

[0039]

[0040]

[0041]

[0042]

[0043] in, This refers to the magnetic field change data output by the motion magnetic sensor 1 under the influence of a magnet; This refers to the magnetic field change data output by the four motion magnetic sensors under the influence of the magnet; This is the first intermediate quantity; This is the second intermediate quantity; For eigenvalues; This is the first error factor for the magnetic sensor. Next, the ideal output value of the magnetic sensor is obtained under ideal conditions to determine the ideal output value of the motion magnetic sensor. The sensitivity error of the magnetic sensor is determined by combining the ideal output value with the actual output value. Simultaneously, the offset error of the motion magnetic sensor is obtained based on the magnetic field conditions. Therefore, based on the offset and sensitivity of the motion magnetic sensor, the error analysis is performed using the following formula to obtain the second error factor of the motion magnetic sensor:

[0044]

[0045] in, This represents the ideal output value of the motion magnetic sensor. This refers to the sensitivity error of the motion magnetic sensor. This refers to the offset error of the motion magnetic sensor; This is the second error factor for the motion magnetic sensor.

[0046] Next, using the first error factor and the second error factor of the motion magnetic sensor, through... The output data of the motion magnetic sensor is calibrated, among which... The output data is the calibrated data from the motion magnetic sensor. This is the output data of the motion magnetic sensor. The first error factor for the motion magnetic sensor. This is the second error factor for the motion magnetic sensor; then, MATLAB is used to correct the output data of the motion magnetic sensor. The displacements were fitted to the corresponding values, and the Marquardt method and general global optimization method were used to analyze the displacements, obtaining analytical displacement data. When using MATLAB to fit the corrected motion magnetic sensor output data to the corresponding displacements, experiments showed that it was difficult for multiple motion sensor data points to regress to a single curve, resulting in significant deviations. The best fitting effect was achieved using the output data of three sets of motion magnetic sensors. Therefore, when using MATLAB to fit and analyze the output data of multiple motion magnetic sensors to obtain the fitting formula, the output data of motion magnetic sensor one, motion magnetic sensor two, and motion magnetic sensor three were selected for subdivided displacement fitting. The following fitting formula was obtained by fitting the corresponding subdivided displacements to the output data of motion magnetic sensor one, motion magnetic sensor two, and motion magnetic sensor three: ;in, To refine the displacement value fitting results, its resolution reaches 0.01 mm. The output data of the motion magnetic sensor one This is the output data of the second motion magnetic sensor. The output data of the motion magnetic sensor three, and then according to A total displacement analysis was performed, where Y represents the total displacement of the magnet moving on the magnetic sensor array. To refine the displacement value fitting results, N is the number of the largest motion magnetic sensor, and S is the magnetic sensor array spacing.

[0047] The above only applies to the calibration of the motion magnetic sensor data. Other sensors do not need calibration if they are not activated and are not used in the calculation. Furthermore, the analysis of the first and second errors of the motion magnetic sensor fully considers the influence of the gap distance on the displacement error and the influence of the motion magnetic sensor itself on the displacement error. This allows for calibration using the first and second error factors of the motion magnetic sensor during displacement analysis. The second error factor eliminates the errors generated by different motion magnetic sensors, thus unifying the accuracy of the output data of the motion magnetic sensor. This effectively reduces the error of the output data of the motion magnetic sensor during displacement analysis and ensures the accuracy of displacement analysis.

[0048] This solution uses a high-sensitivity, wide-range magnetic sensor, such as an AMR or TMR model magnetic sensor, and a large magnet to enhance the magnetic field strength, such as an N38 magnet. The gap between the magnetic sensor and the magnet is in the range of 10-70 mm, and the displacement data can be correctly interpreted. The gap between the protective frame assembly and the reading head 19 can be adjusted by adjusting the component.

[0049] Example 2

[0050] like Figures 1-10 As shown, the measuring rod assembly includes a measuring rod housing 1, one end of which is provided with a connector 2, and the other end of which is provided with a long groove 3. Two adjacent measuring rod housings 1 are connected by the connector 2. The two ends of the connection between two adjacent measuring rod housings 1 are fixed by fastening screws 7. The upper ends of the connection between two adjacent measuring rod housings 1 are fixed by a long screw 5 and a nut 6. The upper end of the long screw 5 is fixed to the bracket 8 by two nuts 9. A magnet is provided inside the measuring rod housing 1.

[0051] The working principle of the above technical solution is as follows: The installation method of two adjacent measuring rod housings 1 is as follows: the long screw 5 is passed upward from the insertion tube 2 of the right measuring rod housing 1, the insertion tube 2 of the right measuring rod housing 1 is inserted into the end of the left measuring rod housing 1 with the long groove 3, the long screw 5 is moved into the long groove 3, and the insertion tube 2 of the right measuring rod housing 1 and the end of the left measuring rod housing 1 with the long groove 3 are fixed by the nut 6. The two ends of the insertion joint of the two adjacent measuring rod housings 1 are fixed by the fastening screws 7. The upper end of the long screw 5 is fixed to the bracket 8 by the two nuts 9. Multiple measuring rod housings 1 are fixedly connected in the above manner, thereby fixing multiple measuring rod housings 1 together. Multiple magnetic sensors are equidistantly linearly arranged and installed in the long tube formed by connecting multiple measuring rod housings 1 to realize long stroke displacement measurement.

[0052] A sealing ring 4 is provided between two adjacent measuring rod housings 1. The sealing ring 4 prevents rainwater from entering the measuring rod housing 1, and prevents the magnetic sensor from being damaged by contact with rainwater, thus reducing its service life.

[0053] Example 3

[0054] like Figures 1-10As 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.

[0055] 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.

[0056] Example 4

[0057] 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.

[0058] 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.

[0059] Example 5

[0060] 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.

[0061] 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.

[0062] 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.

[0063] 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;

[0064] 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;

[0065] 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.

[0066] Example 6

[0067] 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.

[0068] 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.

[0069] Example 7

[0070] like Figures 1-10 As shown, a gap measuring component is installed on the side of the second support frame 17. The gap measuring component includes a first rotating wheel 32, which is rotatably connected to the lower end of the measuring rod housing 1. The first rotating wheel 32 is rotatably connected to the slide rod 33. The slide rod 33 is provided with a second scale line. The slide rod 33 slides in the support protrusion 34. The support protrusion 34 is fixed on the second support frame 17. A spring 35 is provided between the lower end of the slide rod 33 and the support protrusion 34.

[0071] The working principle of the above technical solution is as follows: The upper end of the rotating wheel 32 abuts against the lower end of the measuring rod housing 1. The scale position of the support protrusion 34 corresponding to the scale line 2 on the slide rod 33 is the gap distance between the measuring rod housing 1 and the reading head 19. When the distance between the measuring rod housing 1 and the reading head 19 is reduced, the measuring rod housing 1 squeezes the rotating wheel 32 to move down, which drives the slide rod 33 to move down, which causes the spring 35 to be stretched, which causes the scale value of the support protrusion 34 corresponding to the scale line 2 on the slide rod 33 to decrease.

[0072] Since the rotating wheel 32 is rotatably connected to the lower end of the measuring rod housing 1, even when the reading head 19 is moving, gap adjustment, gap value measurement and display can be performed, which is flexible and convenient.

[0073] Example 8

[0074] like Figures 1-10 As shown, a reading head adapter assembly is provided between the left support assembly and the right support assembly. The reading head adapter assembly includes a support frame 36, a gear 37 is rotatably connected inside the support frame 36, and the gear 37 meshes with two racks 38 on both sides. The ends of the two racks 38 are fixed on two support frames 13 respectively. The support frame 36 is slidably connected to the pressure rod 39. The hexagonal column in the middle of the pressure rod 39 is inserted into the hexagonal groove in the gear 37. The pressure rod 39 is threadedly connected to the adjusting screw 40. The adjusting screw 40 is rotatably connected to the support frame 36. A slide 41 is slidably connected to the upper end of the support frame 36. The reading head 19 is inserted into the middle of the slide 41.

[0075] The working principle of the above technical solution is as follows: Rotating the adjusting screw 40 causes the pressure rod 39 to move upward, which in turn causes the hexagonal column in the middle of the pressure rod 39 to move upward. The hexagonal column moves out of the hexagonal groove in the gear 2 37. Rotating the gear 2 37 causes the two racks 38 to move in opposite directions, which in turn causes the left support assembly and the right support assembly to move in opposite directions. This causes the two protrusions 18 to separate from the positioning grooves at both ends of the reading head 19, and causes the two support frames 2 17 to separate from both ends of the reading head 19. Pulling the slide 41 outward causes the reading head 19 to move outward, thereby moving the reading head 19 to the outside of the measuring rod housing 1. The reading head 19 can then be inspected or pulled out for replacement.

[0076] After the reading head 19 has been repaired or replaced, move the reading head 19 back to the lower end of the measuring rod housing 1, rotate the gear 37 in the opposite direction, drive the two racks 38 to move in the same direction, drive the left support assembly and the right support assembly to move in the same direction, drive the two protrusions 18 to insert into the positioning grooves at both ends of the reading head 19, drive the two support frames 17 to abut against both ends of the reading head 19, and thus fix the reading head 19 under the measuring rod housing 1, which is convenient for the movement, repair or replacement of the reading head 19, especially suitable for heavy reading heads 19;

[0077] Both the support frame 13 and the support frame 36 can be fixed on the mobile device. The positioning slot provided on the support frame 13 allows screws to pass through the positioning slot and be fixed to the mobile device. When it is necessary to adjust the distance between the two support frames 13, the screws can be loosened and the support frame 13 can slide on the mobile device for adjustment.

[0078] Since the distance between the left support assembly and the right support assembly is adjustable, that is, the distance between the two support frames 13 is adjustable and the distance between the support frames 17 is adjustable, it can be adapted to reading heads 19 of different lengths.

[0079] It is understood that the present invention has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of the invention. Furthermore, under the teachings of the present invention, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of the invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of the present invention.

Claims

1. A high-precision long-stroke large-gap displacement sensor characterized by comprising: 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 between 10-70 mm; Only four magnetic sensors in the magnetic sensor array are affected by the magnetic field and act, and other magnetic sensors do not act, the magnetic sensors that act are sequentially recorded as action magnetic sensor one, action magnetic sensor two, action magnetic sensor three and action magnetic sensor four, then adaptive gap algorithm is adopted to perform data processing feature analysis according to the output data of the action magnetic sensors, and it is determined through experimental analysis that, in the case that the magnet gap is constant, only the action magnetic sensor one and the action magnetic sensor four are stable when the magnet displacement is calculated, 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: wherein, is a magnetic field change data value output by the action magnetic sensor one under the influence of the magnet; is a magnetic field change data value output by the action magnetic sensor four under the influence of the magnet; is a first intermediate quantity; is a second intermediate quantity; is a characteristic value; is a first error factor of the magnetic sensor, then, an output value under an ideal state is acquired for the magnetic sensor, an action magnetic sensor ideal output value is obtained, the action magnetic sensor ideal output value is combined with an action magnetic sensor actual output value to determine a magnetic sensor sensitivity error, and an action magnetic sensor offset error is acquired based on a magnetic field condition, so that the action magnetic sensor error is analyzed according to the action magnetic sensor offset and the sensitivity through a formula as follows, a second error factor of the action magnetic sensor is obtained: wherein, is an ideal output value for the motion magnetic sensor; is a sensitivity error for the motion magnetic sensor; is an offset error for the motion magnetic sensor; is a second error factor for the motion magnetic sensor; The first error factor of the motion magnetic sensor and the second error factor of the motion magnetic sensor are used to correct the output data of the motion magnetic sensor by The output data of the motion magnetic sensor is corrected, wherein, The corrected output data of the motion magnetic sensor is used for, The output data of the motion magnetic sensor is used for, The first error factor of the motion magnetic sensor is used for, The second error factor of the motion magnetic sensor is used for; and then the corrected output data of the motion magnetic sensor is fitted by using MATLAB The corresponding displacement.

2. The high-precision long-stroke large-gap displacement sensor according to claim 1, characterized by, 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), adjacent two 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) at the plug-in positions of the adjacent two measuring rod shells (1), the upper end of the plug-in position of the adjacent two measuring rod shells (1) is fixed through a long screw rod (5) and a nut one (6), the upper end of the long screw rod (5) is fixed on a support (8) through two nut twos (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), the left supporting assembly comprises a supporting frame one (13), the supporting frame one (13) is rotationally connected with a gear rod three (14), the supporting frame one (13) is rotationally connected with the adjusting assembly, the gear rod three (14) is in meshing transmission with the adjusting assembly, the gear rod three (14) is internally threadedly connected with an internal screw rod (15), the upper end of the internal screw rod (15) is fixedly provided with a supporting plate one (16), the supporting plate one (16) is fixedly connected with a supporting frame two (17), the supporting frame two (17) is slidingly connected with the supporting frame one (13), the supporting frame two (17) is internally provided with a protruding block (18), the supporting frame two (17) in the left supporting assembly and the right supporting assembly is supported on the two sides of the reading head (19), and the two protruding blocks (18) are respectively plugged into the positioning slots on the two sides of the reading head (19).

4. The high-precision long-stroke large-gap displacement sensor according to claim 3, characterized by The adjusting assembly includes a gear rod one (11) and a gear rod two (12), the gear rod one (11) is slidably connected with the gear rod two (12), the gear rod one (11) is meshingly and drivingly connected with a gear rod three (14) in the left supporting assembly, the gear rod one (11) is rotatably connected with a supporting frame one (13) in the left supporting assembly, the gear rod two (12) is meshingly and drivingly connected with the gear rod three (14) in the right supporting assembly, the gear rod two (12) is rotatably connected with the supporting frame one (13) in the right supporting assembly, and the gear rod two (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 The supporting frame one (13) is provided with four pulley assemblies, two of which are fixed on the supporting frame one (13) through two groups of adjusting nuts one (23), and the other two are fixed on two sliding blocks (25) through two groups of adjusting nuts two (26), the two sliding blocks (25) are slidably arranged on the supporting frame one (13), the outer side of the supporting frame one (13) is provided with a scale line one (24), and the sliding block (25) is provided with a pointer (29), and the front end of the pointer (29) points to the scale line one (24).

6. The high-precision long-stroke large-gap displacement sensor according to claim 5, characterized by The pulley assembly includes a pulley rod (20), the pulley rod (20) is fixed on the supporting frame one (13) through two adjusting nuts one (23), and the pulley rod (20) is rotatably connected with a pulley (22) and is provided with a bearing (21) at the rotating connection position, 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 supporting assembly is provided with a shovel plate assembly at the front end, the shovel plate assembly includes a shovel plate (30), the upper end of the shovel plate (30) is rotatably connected with the upper end of the supporting frame one (13), the lower end of the shovel plate (30) is slidably connected with the measuring rod shell (1), and the rotating connection position of the shovel plate (30) and the supporting frame one (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 supporting frame two (17) is provided with a gap measuring assembly on the side, the gap measuring assembly includes a rotating wheel one (32), the rotating wheel one (32) is rotatably connected with 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 scale line two, the sliding rod (33) is slidably arranged in a supporting protrusion (34), the supporting protrusion (34) is fixed on the supporting frame two (17), and the lower end of the sliding rod (33) is provided with a spring (35) between the supporting protrusion (34).

9. The high-precision long-stroke large-gap displacement sensor according to claim 8, characterized by, The left supporting assembly and the right supporting assembly are provided with a reading head adapting assembly, the reading head adapting assembly includes a supporting frame (36), the supporting frame (36) is rotatably connected with a gear two (37) inside, the gear two (37) is meshingly and drivingly connected with two racks (38) on the two sides, the two racks (38) are respectively fixed on the two supporting frames one (13), the supporting frame (36) is slidably connected with a pressing rod (39), the six-edge column arranged in the middle of the pressing rod (39) is inserted into the six-edge slot arranged in the gear two (37), the pressing rod (39) is threadedly connected with an adjusting screw rod (40), the adjusting screw rod (40) is rotatably connected with the supporting frame (36), the upper end of the supporting frame (36) is slidably connected with a sliding frame (41), and the middle of the reading head (19) is inserted into the sliding frame (41).

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