Linear detection device for straight-stroke magnetic strip

Abstract

The utility model relates to a linearity detection device of a straight stroke magnetic stripe, which comprises a detection base and a detection module, a slide rail and a grating are arranged in the detection base, the slide rail and the grating are arranged in parallel, a mounting groove is arranged in the slide rail along the length direction, and the mounting groove is used for mounting the detected straight stroke magnetic stripe. The magnetizer can receive the magnetism of the detected straight stroke magnetic strip, the magnetism detection module collects the magnetism of the magnetizer and collects a magnetism value, the processing module reads a position detection signal of the grating sensor, and the processing module calculates a linearity result through an algorithm according to the magnetism detection signal and the position detection signal. The detection module slides from one end of the slide rail to the other end of the slide rail, the processing module of the detection module acquires position information and magnetic data at each position, the linearity of the detected straight-stroke magnetic strip is calculated, and the linearity detection device is simple in operation, small in size and convenient to carry, can conveniently and quickly detect the linearity, and is suitable for popularization and application. The maintenance cost is reduced.

Description

Technical Field

[0001] The utility model relates to the field of detection of position feedback components of valve positioners, in particular to a linearity detection device for a straight-stroke magnetic strip. Background Art

[0002] In the valve industry, non-contact position feedback is highly favored due to its safety, reliability, and ease of installation. Currently, all Emerson positioners utilize non-contact magnetic stripes, which are marketed for their high accuracy and resistance to interference. However, during R&D and testing, we discovered that while magnetic stripes exhibit a certain degree of linearity, they are also susceptible to interference from external magnetic fields. Prolonged exposure to strong magnetic fields can cause the linear relationship of the stripes to deviate, resulting in inaccurate position feedback when adjusting valves and failing to achieve the required accuracy. This can lead to users experiencing product anomalies without identifying the magnetic stripe as the cause. Without third-party measurement tools, the offset is generally undetectable because there are no commercially available tools for detecting magnetic stripes. Maintenance personnel cannot determine the quality of the magnetic stripe during repairs. Even with the help of third-party testing tools, systematic testing can only conclude that the entire valve control system is faulty, not the specific magnetic stripe problem. Therefore, it is necessary to design and develop a device to detect the linearity of the magnetic stripe, enabling on-site determination of its quality.

[0003] However, the existing Gauss meter cannot solve this problem. It is necessary to develop an instrument to provide a detection basis for on-site detection. The magnetic stripe is like a ruler and should be measured every year. After investigation, it is found that the magnetic stripe is not included in the scope of measurement. The linearity of the magnetic stripe determines whether the valve opening is accurate. Therefore, it is necessary to detect the magnetic stripe. Summary of the Invention

[0004] The utility model provides a linearity detection device for a straight-stroke magnetic strip, which is used for directly testing the linearity of the magnetic strip to solve the technical problems mentioned in the background technology.

[0005] The technical solution of the utility model is as follows: A linearity detection device for a linear magnetic strip, comprising: a detection base and a detection module, wherein a slide rail and a grating are provided in the detection base, the slide rail and the grating are arranged in parallel, and a mounting groove is provided inside the slide rail along the length direction, wherein the mounting groove is used to mount the linear magnetic strip to be measured;

[0006] The detection module includes a processing module, a magnetic detection module, a magnetic conductor, a grating sensor, and a module housing. The processing module, the magnetic detection module, and the grating sensor are all installed inside the module housing. The magnetic detection module and the grating sensor are communicatively connected to the processing module. The magnetic detection module is connected to the magnetic conductor. Two sliders are provided at the bottom of the module housing. The sliders are slidably connected to the slide rail, and the two sliders are respectively located on both sides of the slide rail. The two sliders are each provided with a magnetic conductor. The grating sensor is arranged opposite to the grating.

[0007] The magnetic conductor can receive the magnetism of the measured linear magnetic strip, the magnetic detection module detects the magnetism of the magnetic conductor and generates a magnetic detection signal, the grating sensor generates a position detection signal, and the processing module generates linearity based on the magnetic detection signal and the position detection signal.

[0008] Furthermore, the mounting groove is provided at the bottom of the detection base, and an adjusting nut is provided on the side of the detection base, and the adjusting nut is used to fix the linear magnetic strip to be measured.

[0009] Furthermore, slide grooves are provided on both sides of the slide rail, and a guide limit block is provided on the slider. The guide limit block is slidably provided in the slide grooves.

[0010] Furthermore, a battery is provided in the module housing, and the battery is used to supply power to the processing module, the magnetic detection module, and the grating sensor.

[0011] Furthermore, a display screen is provided on the top of the module housing, the display screen is communicatively connected to the processing module, and the display screen is used to display the linearity.

[0012] Furthermore, the magnetic detection module includes a TMR chip and a circuit board, the TMR chip is welded on the circuit board, the circuit board is installed in the module housing, and the magnetic conductor is fixed on the circuit board.

[0013] Furthermore, an amplifier circuit is provided on the circuit board, an input end of the amplifier circuit is connected to an output end of the TMR chip, and an output end of the amplifier circuit is connected to the processing module.

[0014] Furthermore, a reference voltage circuit is provided on the circuit board, and the reference voltage circuit is connected to the amplifying circuit for providing a reference voltage for the amplifying circuit.

[0015] The beneficial effects of the present invention are as follows: the present invention installs the measured linear magnetic strip in the detection base, slides the detection module from one end of the slide rail to the other end, and the processing module of the detection module obtains the position information and the magnetic data at each position, thereby calculating the linearity of the measured linear magnetic strip. The present invention is simple to operate, small in size, easy to carry, can detect linearity conveniently and quickly, and reduces maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural diagram of the present utility model.

[0017] Figure 2 It is a cross-sectional schematic diagram of the present utility model.

[0018] Figure 3 It is an exploded view of the present utility model.

[0019] Figure 4 It is a structural block diagram of the detection module of the present utility model.

[0020] Figure 5 It is a schematic diagram of the magnetic detection module in the present utility model. DETAILED DESCRIPTION

[0021] In order to enable those skilled in the art to better understand the solutions of the present invention, 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. The embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts should fall within the scope of protection of the present invention.

[0022] In the technical solution of the present utility model, Figure 1 This is a structural block diagram provided according to the specific structure of a linear magnetic strip linearity detection device of the utility model, such as Figure 1 As shown, the utility model includes:

[0023] The detection base 1 and the detection module 2 are provided with a slide rail 11 and a grating 12 in the detection base 1. The slide rail 11 and the grating 12 are arranged in parallel. The interior of the slide rail 11 is provided with a mounting groove 13 along the length direction. The mounting groove 13 is used to install the linear magnetic strip 3 to be measured. The detection module 2 can slide on the slide rail 11.

[0024] like Figure 3 and Figure 4As shown, the detection module 2 includes a processing module 21, a magnetic detection module 25, a magnetizer 22, a grating sensor 23, and a module housing 24. The processing module 21, the magnetic detection module 25, and the grating sensor 23 are all installed inside the module housing 24. The magnetic detection module 25 and the grating sensor 23 are communicatively connected to the processing module 21. The magnetic detection module 25 is connected to the magnetizer 22. Two sliders 26 are provided at the bottom of the module housing 24. The sliders 26 are slidably connected to the slide rail 11, and the two sliders 26 are respectively located on both sides of the slide rail 11. Magnetizers 22 are provided in the two sliders 26. The two magnetizers are located on both sides of the slide rail 11, and more specifically, they are installed on both sides of the measured linear magnetic strip 3. During the sliding process, the magnetizers continuously receive the magnetism of the measured linear magnetic strip 3, and then the magnetism is detected by the magnetic detection module to determine the magnetism of each position of the measured linear magnetic strip.

[0025] The grating sensor 23 is arranged opposite to the grating 12 , and the grating sensor 23 reads the number of grids on the grating 12 to determine the current position.

[0026] The magnetizer 22 can receive the magnetism of the linear magnetic strip 3 to be measured. When in use, the detection module 2 needs to slide from one end of the slide rail to the other end of the slide rail. During the sliding process, the magnetizer receives the magnetism of different positions of the linear magnetic strip 3 to be measured in real time. The magnetic detection module 25 detects the magnetism of the magnetizer 22 and generates a magnetic detection signal. The magnetic detection module collects the magnetism of the magnetizer and collects the magnetic value.

[0027] Then, the grating sensor 23 generates a position detection signal, and the processing module reads the grating sensor position detection signal. After the position detection signal corresponds to the magnetic detection signal, the processing module 21 generates linearity according to the magnetic detection signal and the position detection signal, wherein the processing module calculates the linearity result through an algorithm. It should be noted that the above-mentioned processing module can specifically adopt an MCU chip, and the processing module calculates the linearity of the magnetic stripe through the least squares method, wherein the least squares method is a technology well known to those skilled in the art. This technical solution does not involve improvements in program logic, so the method for calculating linearity will not be repeated here.

[0028] In one embodiment of the present invention, the mounting groove 13 is provided at the bottom of the detection base 1, and an adjusting nut 14 is provided on the side of the detection base 1. The adjusting nut 14 is used to fix the linear magnetic strip 3 to be measured. The linear magnetic strip 3 to be measured is tightened and loosened by screwing the adjusting nut 14 in and out.

[0029] In one embodiment of the present invention, Figure 2As shown, a slide groove 111 is provided on one side of the slide rail 11, and the slide groove 111 is provided along the length direction of the slide rail. The slider 26 is provided with a guide stopper 261, and the guide stopper 261 is slidably disposed in the slide groove 111. The guide stopper 261 serves to limit the position of the detection module, and can prevent the detection module from falling off the slide rail during the process of sliding the detection module along the slide rail. The guide stopper can be connected to the slider with a bolt and threadedly connected. During the installation process, the bolt can be removed to realize the detachment of the detection module from the slide rail.

[0030] In one embodiment of the present invention, a battery 27 is provided in the module housing 24, and the battery 27 is used to power the processing module 21, the magnetic detection module 25, and the grating sensor 23. The use of a battery for power supply further improves the portability of the detection device.

[0031] In one embodiment of the present invention, a charging interface is provided on the side of the module housing 24, and the charging interface is used to charge the battery.

[0032] In one embodiment of the present invention, a display screen 28 is provided on the top of the module housing 24. The display screen 28 is in communication with the processing module 21 and is used to display the linearity. The display screen 28 can also display the maximum and minimum magnetic values ​​of the magnetic stripe, a magnetic curve, etc. The magnetic curve can be generated using a curve fitting algorithm, which is well known to those skilled in the art and will not be described in detail here.

[0033] In one embodiment of the present invention, a function button 29 is further provided on the top of the module housing 24. The function button 29 is communicatively connected to the processing module 21. The function buttons include but are not limited to a power button, a selection button and a confirmation button.

[0034] In one embodiment of the present invention, the magnetic detection module 25 includes a TMR chip 251 and a circuit board 252. The TMR chip 251 is soldered to the circuit board 252, which is mounted within the module housing 24. The magnetic conductor 22 is fixed to the circuit board 252. Specifically, the magnetic conductor 22 can be fixed to the circuit board 252 by a snap fastener, and the TMR chip 21 can be a TMR2505T model.

[0035] like Figure 5As shown, an amplifier circuit 221 is provided on the circuit board 252. The input of the amplifier circuit 221 is connected to the output of the TMR chip 251, and the output of the amplifier circuit 221 is connected to the processing module 21. The amplifier circuit 221 includes an amplifier chip and functions to amplify the output signal of the TMR chip 251. A reference voltage circuit 222 is provided on the circuit board 252. The reference voltage circuit 222 is connected to the amplifier circuit 221 and is used to provide a reference voltage for the amplifier circuit 221. The amplifier circuit 221 includes an INA333 amplifier chip and its peripheral circuits, and the reference voltage circuit 222 includes an OPA333 operational amplifier chip and its peripheral circuits.

[0036] The method of using the utility model is as follows: place the linear magnetic strip to be measured in the mounting groove at the bottom of the detection base, and fix the linear magnetic strip to be measured by adjusting the nut. Slide the detection module to one side of the slide rail, then press the start button to start the device, select the measurement mode through the selection button, and press the confirmation button to start the test. Then, the staff slides the detection module from one side of the slide rail to the other side. During the sliding process, the grating sensor reads the number of grids on the grating. Each time it enters a grid, it reads the voltage value output by the current magnetic detection module, and then the processing module calculates the linearity and displays it on the display screen. The linearity value displayed by the staff determines the quality of the magnetic strip. Generally, a linearity greater than 1% is qualitatively considered to be abnormal in the linear magnetic strip to be measured.

[0037] Finally, it should be noted that the above specific implementation methods are only used to illustrate the technical solution of the utility model and are not limiting. Although the utility model is described in detail with reference to examples, ordinary technicians in this field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A linearity detection device for a straight-stroke magnetic strip, characterized in that: include: A detection base (1) and a detection module (2), wherein a slide rail (11) and a grating (12) are provided in the detection base (1), the slide rail (11) and the grating (12) are arranged in parallel, and a mounting groove (13) is provided inside the slide rail (11) along the length direction, and the mounting groove (13) is used to install a linear magnetic strip (3) to be measured; The detection module (2) includes a processing module (21), a magnetic detection module (25), a magnetizer (22), a grating sensor (23), and a module housing (24). The processing module (21), the magnetic detection module (25), and the grating sensor (23) are all installed inside the module housing (24). The magnetic detection module (25) and the grating sensor (23) are communicatively connected to the processing module (21). The magnetic detection module (25) is connected to the magnetizer (22). Two sliders (26) are provided at the bottom of the module housing (24). The sliders (26) are slidably connected to the slide rail (11), and the two sliders (26) are respectively located on both sides of the slide rail (11). The magnetizer (22) is provided in each of the two sliders (26). The grating sensor (23) is arranged relative to the grating (12). The magnetic conductor (22) is capable of receiving the magnetism of the measured linear magnetic strip (3); the magnetic detection module (25) detects the magnetism of the magnetic conductor (22) and generates a magnetic detection signal; the grating sensor (23) generates a position detection signal; and the processing module (21) generates linearity based on the magnetic detection signal and the position detection signal.

2. The linearity detection device for a straight-stroke magnetic stripe according to claim 1, characterized in that: The mounting groove (13) is provided at the bottom of the detection base (1), and an adjusting nut (14) is provided on the side of the detection base (1), and the adjusting nut (14) is used to fix the linear magnetic strip (3) to be measured.

3. The linearity detection device for a straight-stroke magnetic stripe according to claim 1, characterized in that: A slide groove (111) is provided on one side of the slide rail (11), and a guide limit block (261) is provided on the slider (26). The guide limit block (261) is slidably provided in the slide groove (111).

4. The linearity detection device for a straight-stroke magnetic stripe according to claim 1, wherein: A battery (27) is provided in the module housing (24), and the battery (27) is used to supply power to the processing module (21), the magnetic detection module (25), and the grating sensor (23).

5. The linearity detection device for a straight-stroke magnetic stripe according to claim 1, wherein: A display screen (28) is provided on the top of the module housing (24), the display screen (28) is communicatively connected to the processing module (21), and the display screen (28) is used to display the linearity.

6. The linearity detection device for a straight-stroke magnetic stripe according to claim 1, characterized in that: The magnetic detection module (25) comprises a TMR chip (251) and a circuit board (252), the TMR chip (251) is welded on the circuit board (252), the circuit board (252) is installed in the module housing (24), and the magnetic conductor (22) is fixed on the circuit board (252).

7. The linearity detection device for a straight-stroke magnetic stripe according to claim 6, characterized in that: An amplifier circuit (221) is provided on the circuit board (252), an input end of the amplifier circuit (221) is connected to an output end of the TMR chip (251), and an output end of the amplifier circuit (221) is connected to the processing module (21).

8. The linearity detection device for a straight-stroke magnetic stripe according to claim 7, characterized in that: A reference voltage circuit (222) is provided on the circuit board (252), and the reference voltage circuit (222) is connected to the amplifier circuit (221) and is used to provide a reference voltage for the amplifier circuit (221).

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