Magnetization strength testing device for magnetostrictive material

Abstract

The application relates to the technical field of magnetization intensity testing, in particular to a magnetostrictive material magnetization intensity testing device which comprises a fixing table, a first connecting seat, a second connecting seat, a connecting frame, a driving unit and a magnetic force testing unit, the first connecting seat is fixed to the fixing table, the first connecting seat and the second connecting seat can respectively fix two ends of a measured workpiece, one end of the connecting frame is fixed to the second connecting seat, the other end of the connecting frame extends away from the second connecting seat, the driving unit can drive the connecting frame, the second connecting seat moves, and the second connecting seat displaces and stretches the measured workpiece, so that the stress borne by the measured workpiece can be known, and then the magnetic force testing unit is used to test the magnetization intensity of the measured workpiece; through the arrangement of the connecting frame, the driving unit is away from the measured workpiece and the magnetic force testing unit, interference of the driving unit on the magnetic force testing unit in testing the magnetization intensity is avoided, and the accuracy of the magnetization intensity testing is improved.

Description

Technical Field

[0001] This invention relates to the field of magnetization intensity testing technology, and in particular to a magnetostrictive material magnetization intensity testing device. Background Technology

[0002] Magnetostrictive materials exhibit a significant magnetostrictive effect, which is the phenomenon where a material changes in length or volume after being magnetized under the influence of an external magnetic field, and returns to its original size when the external magnetic field is removed. Furthermore, the magnetostrictive effect is reversible; that is, when a material deforms in length or volume, its internal magnetization changes. Current research has extensively focused on the positive magnetostrictive effect, as seen in applications such as magnetostrictive level gauges and magnetostrictive waveguides. However, the development of the inverse effect is limited due to the finite change in magnetization and the difficulty in accurately measuring it. With the current development of the full-band electromagnetic spectrum and the innovation of non-destructive testing techniques for metals, researchers have gradually begun to focus on the inverse effect of magnetostriction, although its theoretical basis and testing methods remain very weak.

[0003] Currently, the inverse effect of inverse magnetostriction is mainly tested using a tensile testing instrument, which includes a main measuring component and a stress application device. The stress application device applies stress to both ends of the test piece, and the main measuring component detects the change in the magnetic field of the sample, thereby plotting a stress-magnetization intensity curve.

[0004] While this method offers a relatively simple way to test the stress-magnetization of a sample, it suffers from several drawbacks: The tensile testing machine generates strong electromagnetic interference, exceeding 40% of the sample's emission intensity, and this interference is directly correlated with the tensile strength. Furthermore, the machine directly modulates the sample through the tension force and frequency, causing the electromagnetic interference frequency to match the stress-magnetization frequency generated by the sample. This makes separation difficult through subsequent techniques, resulting in significant errors in the magnetization measurement. Summary of the Invention

[0005] The purpose of this invention is to overcome the above-mentioned technical deficiencies and propose a magnetization intensity testing device for magnetostrictive materials, which solves the technical problem that the magnetization intensity testing device for magnetostrictive materials has a large error in the process of testing the magnetization intensity of the workpiece due to the interference of the tension device in the prior art.

[0006] To achieve the above-mentioned technical objectives, the present invention provides a magnetization intensity testing device for magnetostrictive materials, comprising:

[0007] Fixed platform;

[0008] A first connecting seat is fixed to the fixed platform and is used to fix one end of the workpiece being measured.

[0009] a second connecting seat opposite to the first connecting seat, used for fixing the other end of the workpiece under test;

[0010] a connecting frame, one end of which is fixed to the second connecting seat, and the other end of which extends away from the second connecting seat;

[0011] a driving unit drivingly connected to one end of the connecting frame away from the second connecting seat, used for moving the second connecting seat and stretching the workpiece under test by driving the connecting frame;

[0012] a magnetic testing unit used for connecting the workpiece under test and testing the magnetization intensity of the workpiece under test.

[0013] Optionally, the connecting frame comprises a connecting rod and a driving block, one end of the connecting rod is fixed to the second connecting seat, the other end of the connecting rod passes through the first connecting seat and is slidingly connected to the first connecting seat, the driving block is fixed to one end of the connecting rod away from the second connecting seat, and the driving unit is drivingly connected to the driving block, used for driving the connecting rod to axially slide and moving the second connecting seat away from the first connecting seat by driving the driving block.

[0014] Optionally, the driving unit comprises a driving disc, the circumferential surface of the driving disc is in abutment with the driving block, one surface of the driving disc in abutment with the driving block is provided with a protruding module, and the protruding module is used for moving the driving block periodically towards the first connecting seat by rotating the driving disc.

[0015] Optionally, the protruding module comprises a plurality of protruding portions uniformly spaced along the circumferential direction of the driving disc, and each protruding portion is used for driving the driving block to move towards the first connecting seat by rotating the driving disc.

[0016] Optionally, one surface of the driving block close to the driving disc is provided with an abutment protrusion, and the abutment protrusion is in abutment with the circumferential surface of the driving disc.

[0017] Optionally, the end of the abutment protrusion is provided with a ball, and the ball is in abutment with the circumferential surface of the driving disc.

[0018] Optionally, the circumferential surface of the driving disc is provided with a rolling groove, and the abutment protrusion is in abutment with the side wall of the rolling groove.

[0019] Optionally, the driving unit further comprises a mounting frame and a rotating shaft, the mounting frame is fixed to the fixed table and located at a side of the driving block away from the first connecting seat, the driving disc is sleeved on the rotating shaft and fixedly connected with the rotating shaft, and the rotating shaft is rotationally connected with the mounting frame.

[0020] Optionally, the mounting frame comprises a fixed seat, a sliding frame and a locking piece, the fixed seat is fixed to the fixed table and located at a side of the driving block away from the first connecting seat, the sliding frame is slidingly connected with the fixed seat in a direction close to or away from the first connecting seat, the locking piece is connected with the fixed seat and the sliding frame and used for limiting the sliding of the sliding frame relative to the fixed seat, and the rotating shaft is rotationally connected with the sliding frame.

[0021] Optionally, the connecting rod is a solid carbon fiber rod.

[0022] Compared with the prior art, the magnetization strength testing device for magnetostrictive material has the following beneficial effects: the fixed table, the first connecting seat, the second connecting seat, the connecting frame, the driving unit and the magnetic force testing unit are arranged, the first connecting seat is fixed to the fixed table, one end of the workpiece to be tested can be fixed to the first connecting seat, the second connecting seat is opposite to the first connecting seat and can fix the other end of the workpiece to be tested, one end of the connecting frame is fixed to the second connecting seat, the other end of the connecting frame extends away from the second connecting seat, the driving unit is drivingly connected with the other end of the connecting frame away from the second connecting seat, the second connecting seat can be moved and the workpiece to be tested can be stretched by driving the connecting frame, the stress of the workpiece to be tested can be obtained by obtaining the displacement of the second connecting seat, the magnetization strength of the workpiece to be tested can be tested by the magnetic force testing unit, the relationship between the stress and the magnetization strength of the workpiece to be tested can be obtained, the driving unit is away from the workpiece to be tested and the magnetic force testing unit by arranging the connecting frame, the driving unit can effectively avoid interfering with the magnetic force testing unit to test the magnetization strength, the accuracy of the magnetization strength testing is improved, and the error of the testing process of the testing device is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 The structure schematic view of the magnetization strength testing device for magnetostrictive material is provided for the embodiments of the present application.

[0024] Figure 2 The front view of the magnetization strength testing device for magnetostrictive material is provided for the embodiments of the present application.

[0025] Figure 3 The structure schematic view of the magnetization strength testing device for magnetostrictive material is provided for the embodiments of the present application. Figure 2 The local enlarged view of A in FIG.

[0026] Figure 4A top view of a driving disc of a magnetostrictive material magnetization strength testing device provided by an embodiment of the present application.

[0027] In the drawings, reference numerals:

[0028] 10 - fixed table 20 - first connecting seat 21 - first clamping frame

[0029] 30 - second connecting seat 31 - second clamping frame 40 - connecting frame

[0030] 41 - connecting rod 42 - driving block 50 - driving unit

[0031] 51 - driving disc 52 - mounting frame 53 - rotating shaft

[0032] 421 - abutting protrusion 511 - protrusion module 512 - rolling groove

[0033] 521 - fixed seat 522 - sliding frame 523 - locking piece

[0034] 4211 - ball 5111 - protruding part 10a - measured workpiece DETAILED DESCRIPTION

[0035] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application is further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and do not limit the present application.

[0036] The present application provides a magnetostrictive material magnetization strength testing device, as shown in Figures 1-2 The first connecting seat 20 is fixed to the fixed table 10 and is used to fix one end of the measured workpiece 10a. The second connecting seat 30 is opposite to the first connecting seat 20 and is used to fix the other end of the measured workpiece 10a. One end of the connecting frame 40 is fixed to the second connecting seat 30, and the other end of the connecting frame 40 extends away from the second connecting seat 30. The driving unit 50 is drivingly connected to the end of the connecting frame 40 away from the second connecting seat 30, and is used to move the second connecting seat 30 and stretch the measured workpiece 10a by driving the connecting frame 40. The magnetic force testing unit is used to connect the measured workpiece 10a and test the magnetization strength of the measured workpiece 10a.

[0037] Specifically, the testing device is provided with a fixing table 10, a first connecting seat 20, a second connecting seat 30, a connecting frame 40, a driving unit 50 and a magnetic force testing unit. The first connecting seat 20 is fixed to the fixing table 10 and can fix one end of the measured workpiece 10a. The second connecting seat 30 is opposite to the first connecting seat 20 and can fix the other end of the measured workpiece 10a. One end of the connecting frame 40 is fixed to the second connecting seat 30, and the other end of the connecting frame 40 extends away from the second connecting seat 30. The driving unit 50 is drivingly connected to the end of the connecting frame 40 away from the second connecting seat 30. The driving unit 50 can drive the connecting frame 40 to move and displace the second connecting seat 30 and stretch the measured workpiece 10a. The displacement of the second connecting seat 30 can be obtained, and the strain of the measured workpiece 10a caused by the stretching of the second connecting seat 30 can be obtained. The stress of the measured workpiece 10a under the strain can be obtained. Then, the magnetization intensity of the measured workpiece 10a is tested by the magnetic force testing unit, and the relationship between the stress and the magnetization intensity of the measured workpiece 10a can be obtained. The driving unit 50 is away from the measured workpiece 10a and the magnetic force testing unit through the connecting frame 40, which can effectively avoid the interference of the driving unit 50 on the magnetic force testing unit for testing the magnetization intensity, thereby improving the accuracy of the magnetization intensity test, reducing the error of the testing process of the testing device, and facilitating the research on the relationship between the stress and the magnetization intensity of the measured workpiece 10a.

[0038] It can be understood that the fixing table 10 can be any structure of a rack device.

[0039] In this embodiment, as shown in the figure, Figure 1 The surface of the fixing table 10 is provided with a plurality of uniformly spaced mounting holes, and the first connecting seat 20 is fixed to the fixing table 10 through part of the mounting holes.

[0040] In this embodiment, as shown in the figure, Figures 1-2 The first connecting seat 20 is fixed with a first clamping frame 21, which is used to fix one end of the measured workpiece 10a by clamping.

[0041] In this embodiment, as shown in the figure, Figures 1-2 The second connecting seat 30 is fixed with a second clamping frame 31, which is used to fix the other end of the measured workpiece 10a by clamping.

[0042] In this embodiment, the measured workpiece 10a is a magnetostrictive material, which can stretch to change the magnetization intensity under the tension of the first connecting seat 20 and can recover under its own elastic force.

[0043] In this embodiment, in order to reduce the deformation of the connecting frame 40 during power transmission, the connecting frame 40 should be a high-strength rigid component.

[0044] It can be understood that the driving unit 50 can provide a continuous driving force to the connecting frame 40 or provide a periodic driving force to the connecting frame 40.

[0045] It can be understood that the magnetic force testing unit can be any device capable of measuring the magnetization strength of the workpiece 10a.

[0046] In this embodiment, the magnetic force testing unit is a giant magnetoimpedance magnetic sensor array.

[0047] In this embodiment, as shown in Figures 1-2 The connecting frame 40 includes a connecting rod 41 and a driving block 42. One end of the connecting rod 41 is fixed to the second connecting seat 30, and the other end of the connecting rod 41 passes through the first connecting seat 20 and is in sliding connection with the first connecting seat 20. The driving block 42 is fixed to the end of the connecting rod 41 away from the second connecting seat 30. The driving unit 50 is in driving connection with the driving block 42, and is used to drive the connecting rod 41 to slide axially by driving the driving block 42, so that the second connecting seat 30 moves away from the first connecting seat 20. Specifically, the driving block 42 can be connected with the driving unit 50 to facilitate the driving of the connecting frame 40 by the driving unit 50. The connecting rod 41 is in sliding connection with the first connecting seat 20, which can effectively prevent the connecting rod 41 from deforming under stress, so that the driving force of the driving unit 50 can be better transmitted to the first connecting seat 20.

[0048] In this embodiment, further, the connecting rod 41 is a solid carbon fiber rod. Specifically, the solid carbon fiber rod has high strength, which can effectively reduce the deformation of the connecting rod 41 during transmission of the driving force. In addition, the surface of the carbon fiber rod is relatively smooth, which can effectively reduce the wear during sliding of the connecting rod 41.

[0049] In this embodiment, as shown in Figures 1-2As shown in Figs. 4, the driving unit 50 comprises a driving disc 51, a circumferential surface of the driving disc 51 abutting against the driving block 42, and a protruding module 511 provided on the abutting surface of the driving disc 51, the protruding module 511 being configured to drive the driving block 42 to move periodically towards the first connecting seat 20 by rotating the driving disc 51. Specifically, as the circumferential surface of the driving disc 51 abuts against the driving block 42, when the protruding module 511 abuts against the driving block 42 after the driving disc 51 rotates, the protruding module 511 will generate a driving force acting on the driving block 42 towards the first connecting seat 20, so as to drive the connecting rod 41 to slide and drive the second connecting seat 30 to displace, and stretch the measured workpiece 10a, so as to apply stress to the measured workpiece 10a, and when the protruding module 511 rotates past the driving block 42, the measured workpiece 10a will be reset under the elastic force of the measured workpiece 10a. The driving unit 50 is configured to drive the driving disc 51 and the protruding module 511, so as to generate periodic stress on the measured workpiece 10a, and further to more accurately study the relationship between the stress and the magnetization intensity of the measured workpiece 10a.

[0050] In this embodiment, further, as shown in Figs. 4, Figure 1 and 4 the protruding module 511 comprises a plurality of protruding portions 5111 uniformly spaced along the circumferential direction of the driving disc 51, each of the protruding portions 5111 being configured to drive the driving block 42 to move towards the first connecting seat 20 by rotating the driving disc 51. Specifically, when the driving disc 51 rotates, each of the protruding portions 5111 can drive the driving block 42 to drive the measured workpiece 10a to generate periodic and continuous oscillation, the oscillation period being consistent with the interval period of the protruding portions 5111, and the oscillation frequency of the measured workpiece 10a being different from the working frequency of the driving device (e.g. motor) driving the driving disc 51 to rotate (if the number of the protruding portions 5111 is n, the oscillation frequency of the measured workpiece 10a is n times of the working frequency of the driving device), so as to greatly reduce the same-frequency interference of the magnetization intensity changes generated by the driving device and the measured workpiece 10a, facilitate subsequent data separation, and further more accurately study the relationship between the stress and the magnetization intensity of the measured workpiece 10a.

[0051] In this embodiment, as shown in Figs. 4, Figures 1-3 the abutting surface of the driving block 42 close to the driving disc 51 is provided with an abutting protrusion 421 abutting against the circumferential surface of the driving disc 51. Specifically, the abutting protrusion 421 is configured to form point contact between the driving block 42 and the driving disc 51, so that the height of each of the protruding portions 5111 is consistent with the displacement distance of the first connecting seat 20, and the displacement of the connecting seat and the amplitude of the measured workpiece 10a can be obtained by obtaining the height of each of the protruding portions 5111, without separately measuring the displacement of the connecting seat, thereby providing convenience for stress measurement of the measured workpiece 10a.

[0052] In this embodiment, further, as shown in Figures 1-3 The end of the abutting protrusion 421 is provided with a ball 4211 abutting against the circumferential surface of the driving disc 51. Specifically, the abutting protrusion 421 and the ball 4211 can convert the sliding friction between the abutting protrusion 421 and the driving disc 51 into rolling friction, thereby avoiding the abrasion between the driving disc 51 and the abutting protrusion 421.

[0053] In this embodiment, further, as shown in Figures 1-3 The circumferential surface of the driving disc 51 is provided with a rolling groove 512, and the abutting protrusion 421 abuts against the side wall of the rolling groove 512. Specifically, the rolling groove 512 can effectively avoid the deflection of the abutting protrusion 421 under pressure, thereby reducing the vibration of the abutting protrusion 421.

[0054] In this embodiment, further, the rolling groove 512 is adapted to the ball 4211.

[0055] In this embodiment, as shown in Figures 1-2 The driving unit 50 further includes a mounting frame 52 and a rotating shaft 53. The mounting frame 52 is fixed to the fixed table 10 and located on the side of the driving block 42 away from the first connecting seat 20. The driving disc 51 is sleeved on the rotating shaft 53 and fixedly connected with the rotating shaft 53. The rotating shaft 53 is rotationally connected to the mounting frame 52. The driving disc 51 is sleeved on the rotating shaft 53 and fixedly connected with the rotating shaft 53. Specifically, the driving unit 50 can be connected with a motor or other driving device at the end of the rotating shaft 53. The motor or other driving device can drive the rotating shaft 53 to rotate, thereby driving the driving disc 51 to rotate. The mounting frame 52 is fixed to the fixed table 10, thereby providing stability for the rotation of the driving disc 51.

[0056] In this embodiment, as shown in Figures 1-2 The mounting frame 52 includes a fixed seat 521, a sliding frame 522 and a locking member 523. The fixed seat 521 is fixed to the fixed table 10 and located on the side of the driving block 42 away from the first connecting seat 20. The sliding frame 522 is slidingly connected to the fixed seat 521 in the direction approaching or away from the first connecting seat 20. The locking member 523 is connected with the fixed seat 521 and the sliding frame 522, and is used to limit the sliding of the sliding frame 522 relative to the fixed seat 521. The rotating shaft 53 is rotationally connected to the sliding frame 522. Specifically, the fixed seat 521 can fix the mounting frame 52 to the fixed table 10. The sliding frame 522 can realize the installation of the rotating shaft 53. Since the sliding frame 522 is slidingly connected to the fixed seat 521, the position of the driving disc 51 can be adjusted by the sliding frame 522, thereby adjusting the driving force of the driving disc 51 acting on the driving block 42 to adapt to the testing of different types of test workpieces. The locking member 523 can limit the sliding frame 522 after adjustment.

[0057] Further, the locking member 523 comprises a bolt, which is threadedly connected to the fixing base 521 and abuts against the sliding frame 522.

[0058] The specific working principle of the present application is as follows: when testing the relationship between stress and magnetization intensity of magnetostrictive material, the workpiece 10a is clamped by the first clamping frame 21 of the first connecting base 20 and the second clamping frame 31 of the second connecting base 30, one end of the rotating shaft 53 is connected to the motor, the motor drives the rotating shaft 53 and the driving disc 51 to rotate when working, when the driving disc 51 rotates, the second connecting base 30 is periodically moved by the circumferential protrusions 5111 through the connecting frame 40, so that the stress of the workpiece 10a changes periodically, the magnetic force testing unit tests the magnetization intensity of the workpiece 10a when the stress changes periodically, and finally the relationship between the stress and the magnetization intensity of the workpiece 10a is obtained. Through the above settings of the magnetization intensity testing device of magnetostrictive material, the driving device for applying stress to the workpiece 10a is away from the magnetic force testing unit, at the same time, the stress change frequency of the workpiece 10a is different from the working frequency of the driving device for applying stress to the workpiece 10a, which facilitates the data separation in the later stage, and further reduces the interference of the driving device on the magnetic force testing unit for measuring the magnetization intensity of the workpiece 10a, so as to accurately obtain the relationship between the stress and the magnetization intensity of the workpiece 10a.

[0059] The specific embodiments of the present application described above do not constitute a limitation on the protection scope of the present application. Any various other corresponding changes and modifications made according to the technical concept of the present application shall be included in the protection scope of the claims of the present application.

Claims

1. A magnetostrictive material magnetization strength testing apparatus, characterized by, The utility model relates to a magnetic force testing device for testing the magnetization intensity of workpiece, and belongs to the technical field of testing device. The utility model discloses a magnetic force testing device for testing the magnetization intensity of workpiece, and belongs to the technical field of testing device. The utility model discloses a magnetic force testing device for testing the magnetization intensity of workpiece, and belongs to the technical field of testing device. The utility model discloses a magnetic force testing device for testing the magnetization intensity of workpiece, and belongs to the technical field of testing device. The utility model discloses a magnetic force testing device for testing the magnetization intensity of workpiece, and belongs to the technical field of testing device. The utility model discloses a magnetic force testing device for testing the magnetization intensity of workpiece, and belongs to the technical field of testing device. The utility model discloses a magnetic force testing device for testing the magnetization intensity of workpiece, and belongs to the technical field of testing device. The utility model discloses a magnetic force testing device for testing the magnetization intensity of workpiece, and belongs to the technical field of testing device. The utility model discloses a magnetic force testing device for testing the magnetization intensity of workpiece, and belongs to the technical field of testing device.

2. The magnetostrictive material magnetization strength testing apparatus of claim 1, wherein, The utility model discloses a magnetic force testing device for testing the magnetization intensity of workpiece, and belongs to the technical field of testing device.

3. The magnetostrictive material magnetization strength testing apparatus of claim 1, wherein, The utility model discloses a magnetic force testing device for testing the magnetization intensity of workpiece, and belongs to the technical field of testing device.

4. The magnetostrictive material magnetization test apparatus of claim 3, wherein The utility model discloses a magnetic force testing device for testing the magnetization intensity of workpiece, and belongs to the technical field of testing device.

5. The magnetostrictive material magnetization strength testing apparatus of claim 4, wherein, The utility model discloses a magnetic force testing device for testing the magnetization intensity of workpiece, and belongs to the technical field of testing device.

6. The magnetostrictive material magnetization strength testing apparatus of claim 1, wherein, The utility model discloses a magnetic force testing device for testing the magnetization intensity of workpiece, and belongs to the technical field of testing device.

7. The magnetostrictive material magnetization strength testing apparatus of claim 6, wherein, The utility model discloses a magnetic force testing device for testing the magnetization intensity of workpiece, and belongs to the technical field of testing device.

8. The magnetostrictive material magnetization strength testing apparatus of claim 1, wherein, The utility model discloses a magnetic force testing device for testing the magnetization intensity of workpiece, and belongs to the technical field of testing device. The utility model discloses a magnetic force testing device for testing the magnetization intensity of workpiece, and belongs to the technical field of testing device. The utility model discloses a magnetic force testing device for testing the magnetization intensity of workpiece, and belongs to the technical field of testing device. The utility model discloses a magnetic force testing device for testing the magnetization intensity of workpiece, and belongs to the technical field of testing device. The utility model discloses a magnetic force testing device for testing the magnetization intensity of workpiece, and belongs to the technical field of testing device. The utility model discloses a magnetic force testing device for testing the magnetization intensity of workpiece, and belongs to the technical field of testing device. The utility model discloses a magnetic force testing device for testing the magnetization intensity of workpiece, and belongs to the technical field of testing device. The utility model discloses a magnetic force testing device for testing the magnetization intensity of workpiece, and belongs to the technical field of testing device. The utility model discloses a magnetic force testing device for testing the magnetization intensity of workpiece, and belongs to the technical field of testing device. The utility model discloses a magnetic force testing device for testing the magnetization intensity of workpiece, and belongs to the technical field of testing device. The utility model discloses a magnetic force testing device for testing the magnetization intensity of workpiece, and belongs to the technical field of testing device. The utility model discloses a magnetic force testing device for testing the magnetization intensity of workpiece, and belongs to the technical field of testing device. The utility model discloses a magnetic force testing device for testing the magnetization intensity of workpiece, and belongs to the technical field of testing device. The utility model discloses a magnetic force testing device for testing the magnetization intensity of workpiece, and belongs to the technical field of testing device. The utility model discloses a magnetic force testing device for testing the magnetization intensity of workpiece, and belongs to the technical field of testing device. The utility model discloses a magnetic force testing device for testing the magnetization intensity of workpiece, and belongs to the technical field of testing device. The utility model discloses a magnetic force testing device for testing the magnetization intensity of workpiece, and belongs to the technical field of testing device. The utility model discloses a magnetic force testing device for testing the magnetization intensity of workpiece, and belongs to the technical field of testing device. The utility model discloses a magnetic force testing device for testing the magnetization intensity of workpiece, and belongs to the technical field of testing device. The utility model discloses a magnetic force testing device for testing the magnetization intensity of workpiece, and belongs to the technical field of testing device. The utility model discloses a magnetic force testing device for testing the magnetization intensity of workpiece, and belongs to the technical field of testing device. The utility model discloses a magnetic force testing device for testing the magnetization intensity of workpiece, and belongs to the technical field of testing device. The utility model discloses a magnetic force testing device for testing the magnetization intensity of workpiece, and belongs to the technical field of testing device. The utility model discloses a magnetic force testing device for testing the magnetization intensity of workpiece, and belongs to the technical field of testing device. The utility model discloses a magnetic force testing device for testing the magnetization intensity of workpiece, and belongs to the technical field of testing device. The utility model discloses a magnetic force testing device for testing the magnetization intensity of workpiece, and belongs to the technical field of testing device. The utility model discloses a magnetic force testing device for testing the magnetization intensity of workpiece, and belongs to the technical field of testing device. The utility model discloses a magnetic force testing device for testing the magnetization intensity of workpiece, and belongs to the technical field of testing device. The utility model discloses a magnetic force testing device for testing the magnetization intensity of workpiece, and belongs to the technical field of testing device. The utility model discloses a magnetic force testing device for testing the magnetization intensity of workpiece, and belongs to the technical field of testing device. The utility model discloses a magnetic force testing device for testing the magnetization intensity of workpiece, and belongs to the technical field of testing device. The utility model discloses a magnetic force testing device for testing the magnetization intensity of workpiece, and belongs to the technical field of testing device. The utility model discloses a magnetic force testing device for testing the magnetization intensity of workpiece, and belongs to the technical field of testing device. The utility model discloses a magnetic force testing device for testing the magnetization intensity of workpiece, and belongs to the technical field of testing device. The utility model discloses a magnetic force testing device for testing the magnetization intensity of workpiece, and belongs to the technical field of testing device. The utility model discloses a magnetic force testing device for testing the magnetization intensity of workpiece, and belongs to the technical field of testing device. The utility model discloses a magnetic force testing device for testing the magnetization intensity of workpiece, and belongs to the technical field of testing device. The utility model discloses a magnetic force testing device for testing the magnetization intensity of workpiece, and belongs to the technical field of testing device. The utility model discloses a magnetic force testing device for testing the magnetization intensity of workpiece, and belongs to the technical field of testing device. The utility model discloses a magnetic force testing device for testing the magnetization intensity of workpiece, and belongs to the technical field of testing device. The utility model discloses a magnetic force testing device for testing the magnetization intensity of workpiece, and belongs to the technical field of testing device. The utility model discloses a magnetic force testing device for testing the magnetization intensity of workpiece, and belongs to the technical field of testing device. The utility model discloses a magnetic force testing device for testing the magnetization intensity of workpiece, and belongs to the technical field of testing device. The utility model discloses a magnetic force testing device for testing the magnetization intensity of workpiece, and belongs to the technical field of testing device. The utility model discloses a magnetic force testing device for testing the magnetization intensity of workpiece, and belongs to the technical field of testing device. The utility model discloses a magnetic force testing device for testing the magnetization intensity of workpiece, and belongs to the technical field of testing device. The utility model discloses a magnetic force testing device for testing the magnetization intensity of workpiece, and belongs to the technical field of testing device. The utility model discloses a magnetic force testing device for testing the magnetization intensity of workpiece, and belongs to the technical field of testing device. The utility model discloses a magnetic force testing device for testing the magnetization intensity of workpiece, and belongs to the technical field of testing device. The utility model discloses a magnetic force testing device for testing the magnetization intensity of workpiece, and belongs to the technical field of testing device. The utility model discloses a magnetic force testing device for testing the magnetization intensity of workpiece, and belongs to the technical field of testing device. The utility model discloses a magnetic force testing device for testing the magnetization intensity of workpiece, and belongs to the technical field of testing device. The utility model discloses a magnetic force testing device for testing the magnetization intensity of workpiece, and belongs to the technical field of testing device. The utility model discloses a magnetic force

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