CN201909837U - Automatic positioning measurement device for unidirectional magnetic fields - Google Patents

Abstract

The utility model relates to a single-direction magnetic field automatic positioning and measuring device, which comprises three parts: a data acquisition system, a computer-controlled motor movement system, and a mechanical execution system. Among them, three sets of numerical control motors can realize the translational movement of the probe rod in three directions, and the capacitive displacement sensor can measure the current spatial position of the probe rod, and feed back the position information to the computer through the serial port. The computer uses the control program to judge and then adjust. The movement position of the translation mechanism in three directions, the above process is automatically repeated until the probe rod is adjusted to the position specified by the user. The entire magnetic field measurement process is controlled and automatically completed by a preset computer program, which speeds up the measurement and improves the measurement accuracy. The compiled software interface is easy to operate, and the degree of data visualization is high, which improves the work efficiency. The utility model is mainly applied to the accurate measurement of the unidirectional magnetic field produced by permanent magnetic mechanisms such as various nuclear magnetic resonance imaging equipment and permanent magnet magic rings.

Description

One-way magnetic field automatic positioning measuring device

Technical field :

The utility model mainly relates to a device capable of realizing automatic positioning and measurement of a unidirectional magnetic field. The device can automatically measure magnetic field parameters in a specified area or position in space, and belongs to the technical field of high-precision positioning and measurement of a unidirectional magnetic field.

Background technology :

During the design and construction of special magnetic fields, high-precision magnetic field measurements at specified spatial positions are required. For example, in the design of the magnetic resonance imager magnet structure, it is required that the permanent magnet can generate a highly uniform constant magnetic field in one direction in a spherical imaging space with a diameter of 30 cm. In order to achieve this design goal, it is necessary to continuously adjust the magnet structure, repeatedly measure the magnetic field in the imaging space point by point, and ensure accurate positioning and high measurement accuracy. Another example is the permanent magnet magic ring mechanism used to provide a strong magnetic field for basic experiments. The permanent magnet magic ring can generate a uniform strong magnetic field in one direction in a space with an aperture of several centimeters. Point multiple high-precision measurement problems.

At present, this kind of unidirectional magnetic field measurement work is mainly done manually. In this way, a lot of time is spent on adjusting the position of the Hall probe and recording the measurement data, and the positioning accuracy is low, and the magnetic field measurement data is unreliable. Recently, there is also a technology that combines computer data acquisition technology with manual operation of mechanical mechanisms, which can reduce the workload of reading data to a certain extent. However, it is still necessary to manually rotate the angle of the Hall probe. The workload is very large and the measurement accuracy It also fails to meet the requirements.

It can be seen from the above that for the measurement of some special magnetic fields, such as the measurement of unidirectional magnetic fields, it is urgent to develop a magnetic field measurement system that is easy to operate, high in precision, and strong in versatility.

Utility model content :

1. Purpose of utility model :

The purpose of the utility model is to provide a single-direction magnetic field automatic positioning and measuring device, which overcomes the defects in the prior art, and is convenient and fast, and the interface operation is simple. It can replace the manual measurement process, greatly reduce the operating workload, and improve measurement accuracy and efficiency. It is mainly used in the field of high-precision positioning measurement of unidirectional magnetic field.

2. Technical solution :

The utility model is achieved through the following technical solutions:

A unidirectional magnetic field automatic positioning and measuring device, which is composed of a data acquisition system composed of a capacitive grid displacement sensor and a Hall probe, a computer-controlled motor motion system composed of a computer and a serial port, and a mechanical execution system, characterized in that: the capacitive The displacement sensor includes a capacitive grating displacement sensor fixed scale and a capacitive grating displacement sensor moving ruler; the mechanical execution system includes a translation adjustment mechanism in the x direction of the probe rod, a translation adjustment mechanism in the y direction of the probe rod and a translation adjustment mechanism in the z direction of the probe rod; The Hall probe of the Tesla meter for measuring the magnetic field is installed on the rod, and the probe rod is connected with the y-direction translation adjustment mechanism of the probe rod through the measuring arm; Mechanism connection; the z-direction translation adjustment mechanism of the probe rod is connected with the x-direction translation adjustment mechanism of the probe rod through a sliding bracket.

A second slideway is provided on the y-direction translation adjustment mechanism of the probe rod, a lead screw is arranged in the second slideway, and a second numerically controlled motor is arranged at one end of the lead screw. The lead screw and the slide block are threadedly connected, and the slide block A measuring arm is installed on the top, and the other end of the measuring arm is connected to the probe rod. The scale of the capacitive displacement sensor in the y direction is fixed on the slideway, and the moving ruler of the capacitive displacement sensor is fixed on the slider. The slider drives the lead screw through the second CNC motor to drive the probe rod to do translational movement along the y direction, and the moving scale of the capacitive displacement sensor on the slider records the translational movement distance of the probe rod in the y direction, and passes through the serial port of the moving scale of the capacitive displacement sensor The y-direction position information of the probe rod is transmitted to the computer.

The z-direction translation adjustment mechanism of the probe rod is provided with a third slideway, and a lead screw is also arranged in the third slideway, and the third numerical control motor is arranged at one end of the lead screw, and the lead screw is connected to the moving slide table through threads, A translation adjustment mechanism in the y-direction of the probe rod is installed on the moving slide; the side of the third slideway is fixed with a fixed length of the capacitance grid displacement sensor in the z direction, and the moving scale of the capacitance displacement sensor is fixed on the moving slide; the moving slide passes through the third The movement of the lead screw driven by the numerical control motor drives the probe rod to make a translational movement along the z direction, and the moving scale of the capacitive displacement sensor on the moving slide table records the translational movement distance of the probe rod in the z direction, and transmits the movement distance of the probe rod through the serial port of the moving scale of the capacitive displacement sensor. The z-direction position information is sent to the computer.

The x-direction translation adjustment mechanism of the probe rod is provided with a first slideway, and a lead screw is also arranged in the first slideway, and the first numerical control motor is arranged at one end of the lead screw, and the lead screw and the sliding bracket are connected by threads to slide The z-direction translation adjustment mechanism of the probe rod is installed on the bracket; the fixed length of the x-direction capacitive grid displacement sensor is fixed on the side of the first slideway, and the capacitive grid displacement sensor moving scale is fixed on the sliding bracket; the sliding bracket drives the wire through the first numerical control motor The movement of the bar drives the probe rod to do translational movement along the x direction, and the moving scale of the capacitance displacement sensor on the sliding bracket records the translational movement distance of the probe rod in the x direction, and transmits the position information of the probe rod in the x direction through the serial port of the moving scale of the capacitance displacement sensor to the computer.

The numerically controlled motors are all stepper motors.

The measuring device is made of non-magnetic aluminum alloy material.

3. Advantages and effects :

The beneficial effects of the utility model are as follows:

(1) Three sets of CNC motors are used to realize the translational movement of the probe rod in three directions;

(2) The ball screw and slideway are adopted, and the high precision of the ball screw and the strong contact stiffness of the slideway ensure the high accuracy of the overall positioning of the device;

(3) The closed-loop control system realizes the automatic positioning and automatic measurement of the probe rod, which speeds up the measurement and improves the measurement accuracy;

(4) The interface of the compiled software is easy to operate, and the degree of data visualization is high, which improves the work efficiency.

Description of drawings :

Fig. 1 is a side view of the utility model measuring device;

Fig. 2 is the front view of the utility model measuring device;

Fig. 3 is a schematic diagram of position detection and serial port data transmission of the measuring device of the present invention;

Fig. 4 is a schematic diagram of magnetic field detection and serial port data transmission of the measuring device of the present invention.

Attachment 1 is the software operation interface of the measurement system of the utility model.

Explanation of reference signs :

From Fig. 1 to Fig. 4: 1. The third numerically controlled motor; 2. The first numerically controlled motor; 4. The scale of the capacitive grid displacement sensor; 5. The moving ruler of the capacitive grid displacement sensor; 6. The sliding bracket; 8. Measuring arm; 9. Probe rod; 10. The y-direction translation adjustment mechanism of the probe rod; 11. The second numerical control motor; 12. Lead screw; 13. Slider; 14. Hall probe; 15 Tesla meter; x , y, and z are coordinate directions.

Attachment 1 is a schematic diagram of the software control interface.

Specific implementation methods :

Below in conjunction with accompanying drawing, the utility model is further described:

As shown in Fig. 4, a kind of unidirectional magnetic field automatic positioning measuring device is composed of a data acquisition system composed of capacitive grid displacement sensors 4, 5 and Hall probe 14, a computer-controlled motor motion system composed of a computer and a serial port, and a mechanical execution system. The system configuration is characterized in that: the mechanical execution system includes a translation adjustment mechanism in the x direction of the probe rod as shown in Figure 1, a translation adjustment mechanism in the y direction of the probe rod shown in Figure 2, and a translation adjustment mechanism in the z direction of the probe rod; The Hall probe 14 of the Tesla meter 15 for measuring the magnetic field is installed on the probe rod 9, and the probe rod 9 is connected with the translation adjustment mechanism in the y direction of the probe rod through the measuring arm 8; The stage 7 is connected with the z-direction translation adjustment mechanism of the probe rod; the z-direction translation adjustment mechanism of the probe rod is connected with the x-direction translation adjustment mechanism of the probe rod through the sliding bracket 6 .

As shown in Fig. 1 and Fig. 2, a second slideway 32 is provided on the y-direction translation adjustment mechanism of the probe rod, and a lead screw 12 is arranged in the second slideway 32, and the second numerically controlled motor 11 is arranged on the lead screw 12, the lead screw 12 is threadedly connected to the slide block 13, the slide block 13 is equipped with a measuring arm 8, and the other end of the measuring arm 8 is connected to the probe rod 9. The y-direction capacitive grid displacement sensor scale 4 is fixed on the slideway, and the capacitive grid displacement sensor moving scale 5 is fixed on the slider 13 . The slider 13 drives the lead screw 12 to move through the second numerically controlled motor 11 to drive the probe rod 9 to perform a translational movement along the y direction. The serial port of the moving scale of the capacitive grid displacement sensor shown in 3 transmits the position information of the probe rod in the y direction to the computer.

As shown in Fig. 1 and Fig. 2, the third slideway 33 is provided on the translation adjustment mechanism in the z direction of the probe rod, and the lead screw 12 is also arranged in the third slideway 33, and the third numerically controlled motor 1 is arranged on the lead screw 12. One end of the rod 12, the lead screw is threadedly connected to the moving slide 7, and the moving slide 7 is equipped with a translation adjustment mechanism in the y direction of the probe rod; the side of the third slideway 33 is fixed with a z-direction capacitive displacement sensor scale 4 , the moving ruler 5 of the capacitance grid displacement sensor is fixed on the moving slide 7; the moving slide 7 drives the screw 12 through the movement of the third CNC motor 1 to drive the probe rod 9 to do a translational movement along the z direction, and the capacitance on the moving slide 7 The moving ruler 5 of the displacement sensor records the translational movement distance of the probe rod in the z direction, and transmits the position information of the probe rod in the z direction to the computer through the serial port of the moving ruler of the capacitive displacement sensor as shown in FIG. 3 .

As shown in Fig. 1, the first slideway 31 is provided on the translation adjustment mechanism in the x direction of the probe rod, and a lead screw 12 is also provided in the first slideway, and the first numerically controlled motor 2 is arranged at one end of the lead screw 12, The lead screw and the sliding bracket 6 are threadedly connected, and the z-direction translation adjustment mechanism of the probe rod is installed on the sliding bracket 6; 5 is fixed on the sliding bracket 6; the sliding bracket 6 drives the lead screw 12 through the first numerical control motor 2 to drive the probe rod 9 to do translational movement along the x direction, and the moving scale 5 of the capacitive displacement sensor on the sliding bracket 6 records the x direction of the probe rod Translate the movement distance, and transmit the x-direction position information of the probe rod to the computer through the serial port of the moving scale of the capacitive grating displacement sensor as shown in Figure 3.

The above-mentioned first numerical control motor 2, the second numerical control motor 11 and the third numerical control motor 1 are all stepping motors, and the output terminal of the computer serial port sends a pulse signal to the stepping motor through the stepping motor driver, and is converted into the angular displacement of the stepping motor .

The unidirectional magnetic field automatic positioning measuring device adopts a non-magnetic aluminum alloy material, thereby avoiding the interference of the measuring device with the magnetic field to be measured.

The Tesla meter 15 can select different measurement ranges to realize the measurement of the magnetic fields generated by magnet structures with different magnetic field strengths.

When the utility model performs measurement work, the user first inputs the measurement method to the computer, which can be fixed-point measurement or continuous automatic measurement; the computer sends control information to the stepper motor drivers in the three directions of x, y, and z in sequence according to the closed-loop control algorithm , drive the stepper motors in three directions to move respectively; then the capacitive displacement sensors in the three directions measure the current spatial position of the probe rod, and feed back the position information to the computer through the serial port, combined with the computer control program, to judge and adjust the three directions The moving position of the translation mechanism automatically repeats the above-mentioned process until the probe rod 9 is adjusted to the user-specified position; Computer, and display the position information and magnetic field strength information of the point to be measured through the software interface in Annex 1.

Below in conjunction with specific embodiment the utility model is described further:

Embodiment 1: The measurement ranges of the capacitive grid displacement sensor in the three directions of x, y, and z are as follows: 0-530mm, 0-400mm, 0-400mm; the range of the Teslameter is 0-2.0T, and the resolution The rate is 0.1mT; the software control interface is shown in Appendix 1. The measurement interface can display the coordinates of the currently input measurement point and the coordinate value of the current position measured by the capacitive displacement sensor in real time. The software can automatically adjust according to the error between the measurement target and the current position value, and can also manually adjust the coordinate difference of the single axis, so as to minimize the positioning error.

The utility model is mainly applied to the accurate measurement of the unidirectional magnetic field produced by various nuclear magnetic resonance imaging equipment, permanent magnetic rings and other permanent magnetic mechanisms; the entire magnetic field measurement process is automatically completed by the preset computer program control, which speeds up the measurement speed , improve the measurement accuracy; the software interface compiled is easy to operate, the data visualization degree is high, and the work efficiency is improved.

Claims (6)

1. a folk prescription is to the automatic positioning measuring device in magnetic field, be to be made of computer control motor movement system and mechanical execution system that data acquisition system (DAS), computing machine and serial ports that capacitive displacement transducer and hall probe (14) constitute constitute, it is characterized in that: described capacitive displacement transducer comprises capacitive displacement transducer scale (4) and the moving chi (5) of capacitive displacement transducer; Described mechanical execution system comprises feeler lever x direction translational controlling mechanism, feeler lever y direction translational controlling mechanism and feeler lever z direction translational controlling mechanism; The hall probe (14) of the teslameter (15) of measuring magnetic field is installed on the described feeler lever (9), and this feeler lever (9) is connected with feeler lever y direction translational controlling mechanism by gage beam (8); Feeler lever y direction translational controlling mechanism is connected with feeler lever z direction translational controlling mechanism by motion slide unit (7); Feeler lever z direction translational controlling mechanism is connected with feeler lever x direction translational controlling mechanism by sliding support (6).

2. folk prescription according to claim 1 is to the automatic positioning measuring device in magnetic field, it is characterized in that: described feeler lever y direction translational controlling mechanism is provided with second slideway (32), be provided with leading screw (12) in this second slideway (32), second numerical-control motor (11) is arranged on an end of leading screw (12), this leading screw (12) and slide block (13) are by being threaded, gage beam (8) is installed on the slide block (13), the other end of gage beam (8) connects feeler lever (9), be fixed with y direction capacitive displacement transducer scale (4) on the described slideway, capacitive displacement transducer moves chi (5) and is fixed on the slide block (13), slide block (13) drives leading screw (12) motion drive feeler lever (9) by second numerical-control motor (11) and does translation motion along the y direction, the moving chi (5) of capacitive displacement transducer on the slide block (13) writes down feeler lever y direction translation motion distance, and by the serial ports of the moving chi of capacitive displacement transducer the y direction positional information of feeler lever is passed to computing machine.

3. folk prescription according to claim 1 is to the automatic positioning measuring device in magnetic field, it is characterized in that: described feeler lever z direction translational controlling mechanism is provided with the 3rd slideway (33), also be provided with leading screw (12) in the 3rd slideway (33), the 3rd numerical-control motor (1) is arranged on an end of leading screw (12), this leading screw and motion slide unit (7) are by being threaded, and motion slide unit (7) is gone up feeler lever y direction translational controlling mechanism is installed; Described the 3rd slideway (33) side is fixed with z direction capacitive displacement transducer scale (4), and capacitive displacement transducer moves chi (5) and is fixed on the motion slide unit (7); Motion slide unit (7) drives leading screw (12) motion drive feeler lever (9) by the 3rd numerical-control motor (1) and does translation motion along the z direction, the moving chi (5) of capacitive displacement transducer on the motion slide unit (7) writes down feeler lever z direction translation motion distance, and by the serial ports of the moving chi of capacitive displacement transducer the z direction positional information of feeler lever is passed to computing machine.

4. folk prescription according to claim 1 is to the automatic positioning measuring device in magnetic field, it is characterized in that: described feeler lever x direction translational controlling mechanism is provided with first slideway (31), also be provided with leading screw (12) in this first slideway, first numerical-control motor (2) is arranged on an end of leading screw (12), this leading screw and sliding support (6) are by being threaded, and sliding support (6) is gone up feeler lever z direction translational controlling mechanism is installed; Described first slideway (31) side is fixed with x direction capacitive displacement transducer scale (4), and capacitive displacement transducer moves chi (5) and is fixed on the sliding support (6); Sliding support (6) drives leading screw (12) motion drive feeler lever (9) by first numerical-control motor (2) and does translation motion along the x direction, the moving chi (5) of capacitive displacement transducer on the sliding support (6) writes down feeler lever x direction translation motion distance, and by the serial ports of the moving chi of capacitive displacement transducer the x direction positional information of feeler lever is passed to computing machine.

According to claim 2,3 or 4 described folk prescriptions to the automatic positioning measuring device in magnetic field, it is characterized in that: described numerical-control motor is stepper motor.

According to claim 1,2,3 or 4 described folk prescriptions to the automatic positioning measuring device in magnetic field, it is characterized in that: described measurement mechanism adopts non-magnetic aluminum alloy materials.

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