TWI445988B - Magnetic field measuring device - Google Patents

Description

Magnetic field measuring instrument

The present invention relates to a magnetic field measuring instrument, and more particularly to a magnetic field measuring instrument capable of simultaneously measuring polarity and intensity.

Magnets are widely used in electronic devices such as speakers. In the process of loading the magnet into the electronic device, it is necessary to ensure that the magnet is installed in the correct direction, and the magnet can provide sufficient magnetic field strength to enable the electronic device to work normally.

Conventional techniques generally use a Gauss meter to measure the strength of a magnetic field. The Gauss meter includes a main body portion and a measuring pen connected to the main body portion, and a display screen is provided on the main body portion. By touching the measuring pen to the component under test, the display will get the measured value.

However, the Gauss meter cannot measure the south pole and the north pole of the magnet, so the installation direction of the magnet may still be wrong during the installation process. In addition, when measuring with a Gauss meter, it is necessary to make contact with the plurality of parts of the device to be tested to determine the strength of the magnetic field around it, which is cumbersome to operate.

In view of the above, it is necessary to provide a magnetic field measuring instrument which can simultaneously measure the polarity and strength of a magnet and is easy to operate.

A magnetic field measuring instrument includes a base and a measuring mechanism disposed on the base, and the measuring mechanism includes a connecting shaft, a mounting plate connected to the base, and a pendulum connected to the mounting plate An arm, a connecting block connected to the top of the mounting plate, and an elastic member between the connecting block and the swing arm, the connecting shaft is movably connected to the movable block at one end, and the other end is fixedly connected with the swing arm, and the elastic member is sleeved on the arm Connecting the shaft and the two ends respectively abut the swing arm and the connecting block, and the measuring arm is connected with a measuring magnet opposite to the base. The magnetic field measuring instrument further comprises a displacement sensor disposed on the base and the swing arm relatively.

The above magnetic field measuring instrument utilizes the principle that the magnets of the same polarity attract each other and the magnets of different polarities repel each other, and only when the magnet to be tested and the measuring magnet have the same polarity, the swing arm can be driven to rotate, and the torque generated by the elastic force of the elastic member is used. The balance magnetic moment stops the swing arm, and then the displacement distance of the swing arm is measured by the displacement sensor to determine whether the magnetic field strength generated by the magnet to be tested meets the requirements.

100‧‧‧magnetic field measuring instrument

20‧‧‧Base

30‧‧‧Measurement agency

31‧‧‧Installation board

32‧‧‧ Bearing

33‧‧‧ shaft

34‧‧‧ swing arm

35‧‧‧ Measuring magnet

36‧‧‧Connected shaft

38‧‧‧Flexible parts

39‧‧‧Connecting block

40‧‧‧ Displacement Sensor

50‧‧‧ Magnets to be tested

311‧‧‧Mounting holes

341‧‧‧Connection section

3411‧‧‧ receiving slot

3412‧‧‧ screw hole

342‧‧‧With the paragraph

3421‧‧‧Support

3422‧‧‧measuring end

343‧‧‧Fixed parts

361‧‧‧ shaft cap

362‧‧‧Threading Department

1 is a schematic perspective view of a magnetic field measuring instrument according to an embodiment of the present invention.

2 is a perspective view of the magnetic field measuring instrument shown in FIG. 1 after removing the base, the mounting plate and the displacement sensor.

Figure 3 is a perspective view of the magnetic field measuring instrument shown in Figure 2.

Fig. 4 is a perspective view showing the detection of the magnet to be measured using the magnetic field measuring instrument shown in Fig. 1.

The magnetic field measuring instrument of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

Referring to FIG. 1 to FIG. 3 , the magnetic field measuring instrument 100 of the embodiment of the present invention includes a base 20 , a measuring mechanism 30 disposed on one side of the base, and a displacement sensor 40 disposed opposite to the measuring mechanism 30 . In the present embodiment, the base 20 has a rectangular plate shape.

The measuring mechanism 30 includes two oppositely disposed mounting plates 31, a bearing 32 mounted on the mounting plate 31, a rotating shaft 33, a swing arm 34, a measuring magnet 35, a connecting shaft 36, an elastic member 38, and a connecting block 39.

The mounting plate 31 is a rectangular plate in the present embodiment, and a mounting hole 311 is formed in a middle portion thereof to accommodate the bearing 32.

The two ends of the rotating shaft 33 are respectively connected to the two bearings 32, and the two bearings 32 are respectively positioned in the mounting holes 311 of the two mounting plates 31.

The swing arm 34 includes a connecting section 341, a mating section 342, and a fixing member 343 connecting the two. One end of the connecting portion 341 is fixedly connected to the rotating shaft 33, and the other end is fixedly connected to the engaging portion 342. A receiving groove 3411 is defined in a middle portion of the connecting portion 341. The bottom wall of the receiving groove 3411 is defined in a screw hole 3412 extending through the connecting portion 341. The mating segment 342 includes a support portion 3421 and a measuring end 3422 formed by a vertical extension of one end of the support portion 3421. The measuring magnet 35 is mounted at the end where the connecting section 341 is connected to the mating section 342.

The connecting block 39 is connected to the top end of the two mounting plates 31. One end of the connecting shaft 36 is formed with a shaft cap 361, and the other end is formed with a threaded portion 362. After the connecting shaft 36 is formed with a through hole (not shown) on one end of the shaft cap 361, the shaft cap 361 stops on the connecting block 39, so that the connecting shaft 36 is movably connected to the connecting block 39. The threaded portion 362 is screwed into the screw hole 3412 of the swing arm 34, thereby fixing the connecting shaft 36 and the connecting portion 341.

The elastic member 38 is sleeved on the connecting shaft 36, and one end thereof abuts against the connecting block 39, and the other end abuts against the bottom wall of the receiving groove 3411 of the swing arm 34. In this embodiment, the elastic member 38 is a spring.

Referring to FIG. 4 at the same time, when the magnet 50 to be tested is measured using the magnetic field measuring instrument 100, the magnet 50 to be tested is placed on the base 20 and opposed to the measuring magnet 35. When the magnet 50 to be tested When the measuring magnets 35 have the same polarity, the magnetic repulsive force generated between them causes the swing arm 34 to rotate counterclockwise by a certain angle about the rotating shaft 33, and the connecting shaft 36 is raised and the elastic member 38 is compressed to generate an elastic force. When the magnetic repulsive force between the measuring magnet 35 and the magnet 50 to be tested and the elastic force of the elastic member 38 and the gravity of the swing arm 34 are balanced in the moment generated by the swing arm 34, the swing arm 34 stops rotating. At this time, the displacement sensor 40 will read the displacement generated by the measuring end 3422 of the swing arm 34. When the data read by the displacement sensor 40 exceeds a predetermined value, the bulb (not shown) connected to the displacement sensor 40 will emit light, indicating that the magnetic field strength of the magnet 50 to be tested meets the requirements.

When the magnet 50 to be tested is opposite in polarity to the measuring magnet 35, the magnetic attraction force generated between the two cannot cause the swing arm 34 to rotate about the rotating shaft 33 due to the pulling force of the connecting shaft 36. At this time, it can be judged that the polarity of the magnet 50 to be tested does not meet the requirements.

The magnetic field measuring instrument 100 only needs to place the magnet 50 to be tested on the base 20 at a position opposite to the measuring magnet 35, thereby determining the polarity of the magnet 50 to be tested and whether the magnetic field strength thereof meets the requirements, and the operation is simple and has a relatively simple operation. High detection efficiency. In addition, by rotating the connecting shaft 36, the depth of the threaded portion 362 can be changed to the swing arm 34, thereby adjusting the pre-pressure of the elastic member 38 to determine whether the magnet 50 to be tested having a larger magnetic field strength is qualified, and of course, The replacement of the elastic member 38 changes the pre-pressure.

It can be understood that the magnetic field measuring instrument 100 may not include the connecting shaft 36, and the elastic member 38 directly connects the swing arm 34 and the connecting block 39. The magnetic field measuring instrument 100 can also include only a mounting plate 31 and a bearing 32. The swing arm 34 can also be rotatably coupled to the bearing 32 of the mounting plate 31 by the rotating shaft 33.

In summary, the present invention has indeed met the requirements of the invention patent, and has filed a patent application according to law. However, the above is only a preferred embodiment of the present invention, and it is not possible to limit the scope of the patent application in this case. Anyone who is familiar with the skill of this case will be assisted by the essence of the invention. Equivalent modifications or variations made by God are to be covered by the following patents.

100‧‧‧magnetic field measuring instrument

20‧‧‧Base

30‧‧‧Measurement agency

31‧‧‧Installation board

311‧‧‧Mounting holes

32‧‧‧ Bearing

33‧‧‧ shaft

34‧‧‧ swing arm

35‧‧‧ Measuring magnet

36‧‧‧Connected shaft

38‧‧‧Flexible parts

39‧‧‧Connecting block

40‧‧‧ Displacement Sensor

Claims (9)

A magnetic field measuring instrument comprising a base and a measuring mechanism on the mounting base, wherein the measuring mechanism comprises: a connecting shaft, a mounting plate connected to the base, a swing arm rotatably connected to the mounting plate, and a top connected to the mounting plate a connecting block and an elastic member between the connecting block and the swing arm, wherein one end of the connecting shaft is movably connected to the movable block, and the other end is fixedly connected with the swing arm, and the elastic member is sleeved on the connecting shaft and the two ends are respectively The swing arm and the connecting block are abutted, and the measuring arm is connected with a measuring magnet opposite to the base. The magnetic field measuring instrument further comprises a displacement sensor disposed on the base and opposite to the swing arm. The magnetic field measuring instrument according to claim 1, wherein the magnetic field measuring instrument further comprises a rotating shaft, and the swing arm is rotatably coupled to the mounting plate by a rotating shaft. The magnetic field measuring instrument of claim 2, wherein the magnetic field measuring instrument further comprises a bearing disposed on the mounting plate, the rotating shaft being coupled to the bearing. The magnetic field measuring instrument according to claim 1, wherein one end of the connecting shaft is formed with a shaft cap, and one end of the connecting shaft formed with the shaft cap is movable through the connecting block, so that the connecting shaft is movably connected to the connecting block And fixedly connected to the swing arm. The magnetic field measuring instrument according to claim 4, wherein one end of the connecting shaft is formed with a threaded portion, and the swing arm is provided with a screw hole, and the threaded portion is screwed into the screw hole of the swing arm. The magnetic field measuring instrument according to claim 1, wherein the swing arm is provided with a receiving groove communicating with the screw hole, one end of the elastic member is abutted against the connecting block, and the other end is abutted against the swing arm. In the slot. The magnetic field measuring instrument of claim 1, wherein the swing arm comprises a connecting section, a mating section and a fixing member connecting the two, the connecting section being rotatably connected to the mounting board. The magnetic field measuring instrument according to claim 7, wherein the measuring magnet is installed in the connecting section The end connected to the mating segment. The magnetic field measuring instrument according to claim 7, wherein the engaging section comprises a supporting portion and a measuring end formed by extending perpendicularly from one end of the supporting portion, the measuring end being disposed opposite to the displacement sensor.