Testing device of magnetic resistance type displacement sensor

Abstract

The invention discloses a testing device for a magnetic resistance type displacement sensor. The testing device comprises a detection table, a gear motor, a transmission structure, a magnetic structure, a magnetic resistance type displacement sensor body, a displacement detection structure and an adjusting structure, the transmission structure takes the power of the gear motor as driving force to realize the transverse reciprocating motion of the magnetic structure; a magnetic field generated by the magnetic structure is used as a detection magnetic field of the magnetoresistive displacement sensor body; the displacement detection structure provides distance data of movement of the magnetic structure as a reference of detection data of the magnetoresistive displacement sensor body; the adjusting structure is used for adjusting the longitudinal height of the magnetic structure relative to the magnetoresistive displacement sensor body so as to change the magnetic field position of the magnetic structure. The device has the advantages that the height of the magnetic field generated by the magnetic structure is changed relative to the height of the magnetoresistive displacement sensor body, detection data of the magnetoresistive displacement sensor body acted by the magnetic fields at different heights are tested, and diversified detection is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of sensors, and in particular to a testing device for a magnetoresistive displacement sensor. Background Art

[0002] A magnetoresistive displacement sensor is a device that uses the magnetoresistive effect to measure linear or angular displacement (position change). Its core principle is that the resistance value of certain materials changes with the change of an external magnetic field.

[0003] A magnetoresistive displacement sensor contains one or more magnetoresistive elements made of a special material (such as nickel-iron alloy-Permalloy). When a movable magnet moves relative to the magnetoresistive element, the strength and / or direction of the magnetic field acting on the magnetoresistive element changes. The change in the magnetic field causes the resistance value of the magnetoresistive element to change. The circuit inside the sensor (usually a Wheatstone bridge) detects the change in the resistance of the magnetoresistive element and converts it into an electrical signal (usually voltage or current) proportional to the displacement.

[0004] When the magnetoresistive displacement sensor is detecting, the magnet installed on the power mechanism moves. The magnet installed on the general detection device is fixed in the longitudinal direction, that is, the height of the magnet relative to the magnetoresistive displacement sensor to be detected is unchanged, which makes the detection of the magnetoresistive displacement sensor relatively simple.

[0005] In view of this, we propose a testing device for magnetoresistive displacement sensor. Summary of the Invention

[0006] The object of the present invention is to provide a testing device for a magnetoresistive displacement sensor to solve the problems raised in the above background technology.

[0007] To achieve the above-mentioned object, the present invention provides the following technical solutions: a test device for a magnetoresistive displacement sensor, comprising a test platform, a reduction motor, a transmission structure, a magnetic structure, a magnetoresistive displacement sensor body, a displacement detection structure, and an adjustment structure;

[0008] The test bench serves as an installation base for the reduction motor, the transmission structure, the magnetoresistive displacement sensor body and the displacement detection structure;

[0009] The reduction motor is fixedly arranged on the detection platform, and the transmission structure uses the power of the reduction motor as a driving force to realize the lateral reciprocating movement of the magnetic structure;

[0010] The magnetic field generated by the magnetic structure is used as a detection magnetic field for the magnetoresistive displacement sensor body;

[0011] The displacement detection structure provides data on the distance moved by the magnetic structure, which serves as a reference for the detection data of the magnetoresistive displacement sensor body;

[0012] The adjustment structure is used to adjust the longitudinal height of the magnetic structure relative to the magnetoresistive displacement sensor body, thereby changing the magnetic field position of the magnetic structure.

[0013] Preferably, the magnetoresistive displacement sensor body is arranged on a detection section of a detection platform, and the detection section of the detection platform is U-shaped;

[0014] The detection section of the detection platform is fixedly provided with a track, and the slider fixed at the bottom of the slot in which the magnetoresistive displacement sensor body is embedded can slide on the track.

[0015] Preferably, the transmission structure includes a holder A, a holder B, a screw and a threaded sleeve, wherein the holder A and the holder B are fixedly arranged on the detection platform, the hole on the holder A can be passed through by the transmission shaft of the reduction motor, one end of the screw is rotatably connected to the holder B through a rotating shaft, and the other end of the screw is fixedly connected to the end of the transmission shaft of the reduction motor, and the threaded sleeve is threadedly sleeved on the screw;

[0016] A guide rod is inserted into the opening on the circumferential wall of the threaded sleeve, and both ends of the guide rod are fixedly connected to the retaining frame A and the retaining frame B respectively.

[0017] Preferably, the magnetic structure includes a mounting box and a permanent magnet, the mounting box is arranged on the outer peripheral wall of the threaded sleeve, and the permanent magnet is arranged on the mounting box.

[0018] Preferably, the tops of both sides of the installation box are connected to rotating plates through torsion springs, and pressure blocks are fixedly provided on opposite sides of the tops of the two rotating plates, and the two pressure blocks are used to press the permanent magnets inserted in the installation box.

[0019] Preferably, a movable plate is provided in the installation box via a spring B.

[0020] Preferably, both sides of the installation box are rotationally matched with the threaded sleeve through adjustment structures;

[0021] The adjustment structure includes a connecting rod, a movable block, an insert block, a spring A and a collar. The collar is sleeved on the threaded sleeve. The connecting rod is fixedly provided at the side end of the installation box. The hole on the movable block can be passed through by the connecting rod. A limit block is fixedly provided at the outer end of the connecting rod. The spring A is provided between the limit block and the movable block. The insert block is fixedly provided at the bottom of the movable block. The movable block can slide along the annular groove opened on the inner side of the collar. The movable block can be inserted into the jacks opened at the upper and lower ends of the collar.

[0022] Preferably, the displacement detection structure includes a support plate, a laser rangefinder and a reflective plate, the support plate is fixed on the detection table, the laser rangefinder is fixed on the support plate, the reflective plate is fixed on the threaded sleeve, and the laser emitted by the laser rangefinder is reflected back by the reflective plate and received by the receiving end of the laser rangefinder.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] The magnetoresistive displacement sensor testing device of the present application includes a reduction motor, a transmission structure, a magnetic structure, a magnetoresistive displacement sensor body, a displacement detection structure, and an adjustment structure. During the detection of the magnetoresistive displacement sensor body, the magnetic structure can be repositioned above and below the transmission structure. The magnetic field generated by the magnetic structure changes relative to the height of the magnetoresistive displacement sensor body. The detection data of the magnetoresistive displacement sensor body under the magnetic field effect at different heights is tested, thereby diversifying the detection.

[0025] In this application, the bottoms of the two rotating plates are pressed against each other. Through the principle of leverage, the tops of the two rotating plates move away from each other, so that the pressing block no longer presses the permanent magnet, and the permanent magnet can be pulled out for replacement. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0027] Figure 2 It is an exploded schematic diagram of the transmission structure of the present invention;

[0028] Figure 3 This is a schematic diagram of the connection of the adjustment structure of the present invention;

[0029] Figure 4 For the present invention Figure 3 A magnified schematic diagram of point A;

[0030] Figure 5 Schematic diagram of the ring structure of the present invention

[0031] Figure 6 Schematic diagram of the displacement detection structure of the present invention;

[0032] Figure 7 This is a schematic diagram of the permanent magnet installation structure of the present invention;

[0033] Figure 8 It is a schematic diagram of the cross-sectional connection structure of the installation box of the present invention.

[0034] In the figure: 100, detection platform; 200, reduction motor; 300, transmission structure; 400, magnetic structure; 500, track; 600, magnetoresistive displacement sensor body; 700, displacement detection structure; 800, adjustment structure;

[0035] 301, cage A; 302, cage B; 303, screw rod; 304, threaded sleeve; 305, guide rod;

[0036] 401, mounting box; 402, permanent magnet; 403, rotating plate; 404, torsion spring; 405, pressing block; 406, movable plate; 407, spring B;

[0037] 701, support plate; 702, laser rangefinder; 703, reflector;

[0038] 801, connecting rod; 802, movable block; 803, insert block; 804, spring A; 805, limit block; 806, collar;

[0039] 8061, ring groove; 8062, socket. DETAILED DESCRIPTION

[0040] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments 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 ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0041] See also Figures 1 to 3 A testing device for a magnetoresistive displacement sensor includes a testing platform 100, a reduction motor 200, a transmission structure 300, a magnetic structure 400, a magnetoresistive displacement sensor body 600, a displacement detection structure 700 and an adjustment structure 800.

[0042] The detection platform 100 serves as an installation base for the reduction motor 200 , the transmission structure 300 , the magnetoresistive displacement sensor body 600 and the displacement detection structure 700 .

[0043] The reduction motor 200 is fixedly mounted on the detection platform 100, and the transmission structure 300 uses the power of the reduction motor 200 as a driving force to realize the lateral reciprocating movement of the magnetic structure 400; the magnetic field generated by the magnetic structure 400 serves as the detection magnetic field of the magnetoresistive displacement sensor body 600; the displacement detection structure 700 provides data on the distance moved by the magnetic structure 400 as a reference for the detection data of the magnetoresistive displacement sensor body 600; the adjustment structure 800 is used to adjust the longitudinal height of the magnetic structure 400 relative to the magnetoresistive displacement sensor body 600, thereby changing the magnetic field position of the magnetic structure 400.

[0044] During the detection of the magnetoresistive displacement sensor body 600, the magnetoresistive displacement sensor body 600 is placed in the card slot and the reduction motor 200 provides power to the transmission structure 300, thereby driving the magnetic structure 400 to move back and forth laterally. The magnetic field generated by the magnetic structure 400 changes relative to the magnetoresistive displacement sensor body 600. The data generated by the magnetoresistive displacement sensor body 600 is compared with the displacement data actually detected by the displacement detection structure 700 to detect the magnetoresistive displacement sensor body 600.

[0045] In addition, the magnetic structure 400 can be repositioned above and below the transmission structure 300, and the height of the magnetic field generated by the magnetic structure 400 relative to the magnetoresistive displacement sensor body 600 can be changed to test the detection data of the magnetoresistive displacement sensor body 600 under the magnetic field effect at different heights.

[0046] In this embodiment, the magnetoresistive displacement sensor body 600 is set in the detection section of the detection platform 100. The detection section of the detection platform 100 is U-shaped. The magnetoresistive displacement sensor body 600 is located in the U-shaped area. The magnetoresistive displacement sensor body 600 will not affect the movement of the magnetic structure 400.

[0047] In this embodiment, the detection section of the detection platform 100 is fixedly provided with a track 500. The slider fixed at the bottom of the slot in which the magnetoresistive displacement sensor body 600 is embedded can slide on the track 500, so that the lateral position of the magnetoresistive displacement sensor body 600 can be adjusted to detect from different positions. In addition, the slider fixed on the magnetoresistive displacement sensor body 600 relies on friction to stabilize on the track 500 when not pushed.

[0048] For details, see Figure 2 The transmission structure 300 includes a holder A301, a holder B302, a screw 303, and a threaded sleeve 304. Both holder A301 and holder B302 are fixedly mounted on the test platform 100. The drive shaft of the reduction motor 200 passes through the hole in the holder A301. One end of the screw 303 is rotatably connected to the holder B302 via a rotating shaft. The other end of the screw 303 is fixedly connected to the end of the drive shaft of the reduction motor 200. The threaded sleeve 304 is threadedly mounted on the screw 303. The drive shaft of the reduction motor 200 drives the screw 303 to rotate, and the threaded sleeve 304 moves along the rotating screw 303, thereby driving the magnetic structure 400 to move.

[0049] In this embodiment, a guide rod 305 is inserted into an opening in the circumferential wall of the threaded sleeve 304. The ends of the guide rod 305 are fixedly connected to the retainer A 301 and the retainer B 302, respectively. As the threaded sleeve 304 moves along the rotating screw 303, the guide rod 305 remains stationary, and the threaded sleeve 304 also moves along the guide rod 305, thereby preventing the threaded sleeve 304 from rotating during movement.

[0050] The magnetic structure 400 includes a mounting box 401 and a permanent magnet 402 . The mounting box 401 is disposed on the outer peripheral wall of the threaded sleeve 304 . The permanent magnet 402 is disposed on the mounting box 401 . The permanent magnet 402 generates a magnetic field.

[0051] In this embodiment, refer to Figure 7 The tops of both sides of the mounting box 401 are connected to rotating plates 403 via torsion springs 404. The elastic coefficient of torsion springs 404 is selected by technicians in this field according to actual conditions. A pressure block 405 is fixedly provided on opposite sides of the tops of the two rotating plates 403. The two pressure blocks 405 are used to press the permanent magnets 402 inserted into the mounting box 401. When replacing the permanent magnets 402, the staff member presses the bottoms of the two rotating plates 403 with their fingers and presses them toward each other. Through the principle of leverage, the tops of the two rotating plates 403 move away from each other, causing the pressure blocks 405 to no longer press the permanent magnets 402, and the permanent magnets 402 can be pulled out for replacement.

[0052] In this embodiment, refer to Figure 8 A movable plate 406 is provided in the installation box 401 through a spring B407. The elastic coefficient of the spring B407 is selected by the technicians in this field according to the actual situation. When inserting the permanent magnet 402, the two rotating plates 403 are pressed relative to each other. After the permanent magnet 402 contacts the movable plate 406, the movable plate 406 is squeezed, and the spring B407 is compressed. The two rotating plates 403 are released. Under the action of the torsion spring 404, the tops of the two rotating plates 403 move relative to each other until the pressing block 405 presses the permanent magnet 402. When replacing the permanent magnet 402, the limit of the permanent magnet 402 is released, and the compressed spring B407 lifts the movable plate 406, thereby removing the permanent magnet 402. The permanent magnet 402 has sufficient thickness to be taken out by the staff.

[0053] For further information, see Figures 3 to 5 , both sides of the installation box 401 are respectively rotatably matched with the threaded sleeve 304 through the adjustment structure 800; the adjustment structure 800 includes a connecting rod 801, a movable block 802, an insert block 803, a spring A804 and a collar 806, the collar 806 is sleeved on the threaded sleeve 304, the connecting rod 801 is fixedly set at the side end of the installation box 401, the hole on the movable block 802 can be passed through by the connecting rod 801, and a limit block 805 is fixedly set at the outer end of the connecting rod 801, the spring A804 is set between the limit block 805 and the movable block 802, the insert block 803 is fixedly set at the bottom of the movable block 802, the movable block 802 can slide along the annular groove 8061 opened on the inner side of the collar 806, and the movable block 802 can be inserted into the jack 8062 opened at the upper and lower ends of the collar 806.

[0054] When adjusting the position of the permanent magnet 402, the staff presses the two movable blocks 802 relative to each other, the spring A804 is further stretched, the plug block 803 moves with the movable block 802, the plug block 803 leaves the corresponding socket 8062, rotates the installation box 401 and the permanent magnet 402, adjusts the installation box 401 and the permanent magnet 402 to the required position, loosens the movable block 802, and under the action of the spring A804, the plug block 803 is inserted into the corresponding socket 8062 to fix the installation box 401 and the permanent magnet 402.

[0055] In this embodiment, the spring A804 is sleeved on the connecting rod 801, and the elastic coefficient of the spring A804 is selected by technicians in this field according to actual conditions.

[0056] Further, see Figure 6 The displacement detection structure 700 includes a support plate 701, a laser rangefinder 702, and a reflector 703. The support plate 701 is fixed to the testing platform 100, the laser rangefinder 702 is fixed to the support plate 701, and the reflector 703 is fixed to the threaded sleeve 304. The laser emitted by the laser rangefinder 702 is reflected by the reflector 703 and received by the receiving end of the laser rangefinder 702. The displacement data measured by the laser rangefinder 702 is compared with the data detected by the magnetoresistive displacement sensor body 600 and transmitted to the external testing system, thereby testing the magnetoresistive displacement sensor body 600.

[0057] In this embodiment, a display screen for displaying data may be provided on the laser rangefinder 702 so that the data can be viewed intuitively.

[0058] Working Principle: During the testing of the magnetoresistive displacement sensor body 600, the magnetoresistive displacement sensor body 600 is placed in the card slot. The transmission shaft of the reduction motor 200 drives the screw rod 303 to rotate, and the threaded sleeve 304 moves along the rotating screw rod 303. As the threaded sleeve 304 moves along the rotating screw rod 303, the guide rod 305 remains stationary, and the threaded sleeve 304 also moves along the guide rod 305, causing the mounting box 401 and the permanent magnet 402 to move accordingly. The magnetic field generated by the permanent magnet 402 changes relative to the magnetoresistive displacement sensor body 600. The displacement data measured by the laser rangefinder 702 is compared with the data detected by the magnetoresistive displacement sensor body 600 and transmitted to the external testing system, thereby testing the magnetoresistive displacement sensor body 600.

[0059] When adjusting the position of the permanent magnet 402, the staff presses the two movable blocks 802 relative to each other, the spring A804 is further stretched, the plug block 803 moves with the movable block 802, and the plug block 803 leaves the corresponding socket 8062. The installation box 401 and the permanent magnet 402 are rotated, and the installation box 401 and the permanent magnet 402 are adjusted to the required position. The movable block 802 is released, and under the action of the spring A804, the plug block 803 is inserted into the corresponding socket 8062 to fix the installation box 401 and the permanent magnet 402. The position of the installation box 401 and the permanent magnet 402 is adjusted, and the above detection steps are repeated.

[0060] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

Claims

1. A test device for a magnetoresistive displacement sensor, characterized in that: It comprises a detection platform (100), a reduction motor (200), a transmission structure (300), a magnetic structure (400), a magnetoresistive displacement sensor body (600), a displacement detection structure (700), and an adjustment structure (800); The detection platform (100) serves as an installation base for the reduction motor (200), the transmission structure (300), the magnetoresistive displacement sensor body (600), and the displacement detection structure (700); The reduction motor (200) is arranged on the detection platform (100), and the transmission structure (300) uses the power of the reduction motor (200) as a driving force to realize the lateral reciprocating movement of the magnetic structure (400); The magnetic field generated by the magnetic structure (400) serves as a detection magnetic field for the magnetoresistive displacement sensor body (600); The displacement detection structure (700) provides distance data of the magnetic structure (400) moving, which serves as a reference for detection data of the magnetoresistive displacement sensor body (600); The adjustment structure (800) is used to adjust the longitudinal height of the magnetic structure (400) relative to the magnetoresistive displacement sensor body (600), thereby changing the magnetic field position of the magnetic structure (400).

2. The magnetoresistive displacement sensor testing device according to claim 1, characterized in that: The magnetoresistive displacement sensor body (600) is arranged on a detection section of a detection platform (100), and the detection section of the detection platform (100) is U-shaped; The detection section of the detection platform (100) is fixedly provided with a track (500), and a slider fixed at the bottom of the card slot in which the magnetoresistive displacement sensor body (600) is embedded can slide on the track (500).

3. The magnetoresistive displacement sensor testing device according to claim 1, characterized in that: The transmission structure (300) comprises a holder A (301), a holder B (302), a screw rod (303) and a threaded sleeve (304); the holder A (301) and the holder B (302) are both fixedly arranged on the detection platform (100); the hole on the holder A (301) can be passed through by the transmission shaft of the reduction motor (200); one end of the screw rod (303) is rotatably connected to the holder B (302); the other end of the screw rod (303) is connected to the end of the transmission shaft of the reduction motor (200); and the threaded sleeve (304) is threadedly sleeved on the screw rod (303); A guide rod (305) is provided in the opening on the circumferential wall of the threaded sleeve (304), and two ends of the guide rod (305) are respectively connected to the retaining frame A (301) and the retaining frame B (302).

4. The test device for a magnetoresistive displacement sensor according to claim 3, wherein: The magnetic structure (400) comprises a mounting box (401) and a permanent magnet (402); the mounting box (401) is arranged on the outer peripheral wall of the threaded sleeve (304); and the permanent magnet (402) is arranged on the mounting box (401).

5. The test device for a magnetoresistive displacement sensor according to claim 4, characterized in that: The tops of both sides of the installation box (401) are connected to rotating plates (403) via torsion springs (404), and pressing blocks (405) are respectively provided on opposite sides of the tops of the two rotating plates (403). The two pressing blocks (405) are respectively used to press the permanent magnets (402) inserted into the installation box (401).

6. The test device for a magnetoresistive displacement sensor according to claim 5, characterized in that: A movable plate (406) is provided in the installation box (401) via a spring B (407).

7. The test device for a magnetoresistive displacement sensor according to claim 4, wherein: The two sides of the installation box (401) are respectively rotatably matched with the threaded sleeve (304) through the adjustment structure (800); the adjustment structure (800) includes a connecting rod (801), a movable block (802), an insert block (803), a spring A (804) and a collar (806), the collar (806) is sleeved on the threaded sleeve (304), the connecting rod (801) is arranged at the side end of the installation box (401), and the hole on the movable block (802) can be connected to the connecting rod. (801) passes through, a limit block (805) is provided at the outer end of the connecting rod (801), the spring A (804) is provided between the limit block (805) and the movable block (802), the insert block (803) is provided at the bottom of the movable block (802), the movable block (802) can slide along the annular groove (8061) provided on the inner side of the collar (806), and the movable block (802) can be inserted into the jacks (8062) provided at the upper and lower ends of the collar (806).

8. The magnetoresistive displacement sensor testing device according to claim 1, characterized in that: The displacement detection structure (700) comprises a support plate (701), a laser rangefinder (702) and a reflective plate (703); the support plate (701) is fixed on the detection platform (100); the laser rangefinder (702) is fixed on the support plate (701); the reflective plate (703) is fixed on the threaded sleeve (304); and the laser emitted by the laser rangefinder (702) is reflected back by the reflective plate (703) and received by a receiving end of the laser rangefinder (702).

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