Magnetic head testing device

Abstract

The invention relates to the technical field of magnetic head production, in particular to a magnetic head testing device which comprises a bottom plate, supporting rings are symmetrically fixed to the two sides of the upper portion of the bottom plate, a fixing ring rotationally connected with the supporting rings is arranged between the two supporting rings, the fixing ring is driven by a rotating motor to rotate, and a plurality of fixing devices are arranged on the fixing ring. The fixing device comprises a fixing groove formed in the surface of a fixing ring, an inserting hole is formed in the bottom of the fixing groove, a connecting column connected with the inserting hole is arranged on the inner wall of the fixing ring, a support is further fixed to the bottom plate, a plurality of testing air cylinders are fixed to the support, a testing plate is further arranged in the fixing ring, and the testing air cylinders are fixed to the testing plate. The tail ends of piston rods of the testing air cylinders are fixed to the testing plate, connecting holes are formed in the positions, corresponding to the connecting columns, of the testing plate, the bottom plate is further provided with a lead screw and a plurality of sliding rods, and a sliding table is further arranged above the bottom plate. The device can test the magnetic head.

Description

Technical Field

[0001] This invention relates to the field of magnetic head manufacturing technology, and in particular to a magnetic head testing device. Background Technology

[0002] A banknote counter is a machine used to verify the authenticity of banknotes and count their quantity. Due to the massive scale of cash circulation and the heavy workload of cash handling at bank teller counters, banknote counters have become indispensable equipment, combining counting and counterfeit detection. With the development of printing, photocopying, and electronic scanning technologies, the level of counterfeit banknote production is becoming increasingly sophisticated, necessitating continuous improvement in the counterfeit detection performance of banknote counters. Based on the different paths the banknotes take, banknote counters are divided into horizontal and vertical types. Counterfeit detection methods typically include fluorescence recognition, magnetic analysis, and infrared penetration.

[0003] Before a magnetic head is introduced to the market, it needs to undergo detailed and careful testing to ensure that its function is correct and its performance is reliable. The company's designed magnetic heads undergo a factory test before leaving the factory. Patent application number CN202110876978.4 discloses a magnetic head sensitivity testing device. This device fixes the magnetic head to be tested on a bracket, which is then snapped onto a slide. When the first magnetic head on the bracket is aligned with the connector, the piston rod on the cylinder extends, causing the connector to move closer to the pin on the magnetic head. The connector and the pin on the magnetic head assemble together. The sensing chip on the magnetic head senses eddy currents, thus achieving the purpose of sensing the magnetic strip and testing the magnetic head's sensitivity. Although this type of device automates the sensitivity testing of magnetic heads, it can only test one magnetic head at a time. After testing, the second magnetic head is moved to a designated position for testing, resulting in low testing efficiency.

[0004] This invention was proposed in response to the shortcomings of existing technologies. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a magnetic head testing device.

[0006] This invention can be achieved through the following technical solutions: This invention discloses a magnetic head testing device, comprising a base plate, on which support rings are symmetrically fixed on both sides of the upper part of the base plate. A fixed ring, rotatably connected to the support rings, is disposed between the two support rings. The fixed ring is driven to rotate by a rotary motor. Multiple fixing devices are disposed on the fixed ring, each including a fixing groove on its surface and an insertion hole at the bottom of the groove. A connecting post, connected to the insertion hole, is disposed on the inner wall of the fixed ring. A bracket is also fixed on the base plate, and multiple test cylinders are fixed on the bracket. A test plate is disposed inside the fixed ring, and the piston rod ends of each test cylinder are fixed to the test plate. The connecting post is located on the test plate. All positions are provided with connection holes. The base plate is also provided with a lead screw and multiple sliding rods. A slide table is also provided above the base plate. Threaded tubes are fixed on the slide table at positions corresponding to the lead screw. The lead screw passes through the threaded tubes and is threadedly connected to them. A support tube is also fixed on the slide table. The sliding rods pass through the support tubes and are slidably connected to them. A rotating shaft is also provided above the slide table. The rotating shaft is driven to rotate by a test motor. Circular rings are uniformly fixed on the rotating shaft. Magnetic strips are uniformly fixed on the outer surface of the circular rings. Each magnetic strip is covered with a shield. The magnetic permeability of the shields on the same circular ring is different, and the magnetic permeability of each shield gradually increases along the direction of the circular ring.

[0007] Preferably, a circular rack is fixed on the fixed ring, and a gear is fixed on the output end of the rotary motor, the gear meshing with the circular rack.

[0008] Preferably, the bracket also has multiple discharge cylinders fixed on it. Each of the fixed grooves has a through hole penetrating the fixed ring at its bottom. A top plate is also provided inside the fixed ring. The piston rod ends of each discharge cylinder are fixed to the top plate, and a push rod is fixed at the bottom of the top plate corresponding to the through hole. When the tested magnetic head reaches the lowest position of the fixed ring, the discharge cylinder is activated, the piston rod on the discharge cylinder extends, and the push rod moves. After passing through the through hole at the corresponding position, the push rod ejects the magnetic head from the fixed groove.

[0009] Preferably, a baffle is also provided on one side of the fixing ring, the baffle being fixed to the support ring, and a test window penetrating the baffle is also provided on the baffle at the test plate position. The baffle prevents the magnetic head in the fixing groove from falling out of the fixing groove when the fixing ring rotates.

[0010] Preferably, a sliding plate is also inclinedly fixed to the base plate below the fixing ring. The tested magnetic head falls onto the sliding plate and is collected after sliding down the plate.

[0011] Compared with existing technologies, the present invention has the following advantages: This device can test magnetic heads, and can perform sensitivity tests on a row of magnetic heads at the same time, which greatly improves the testing efficiency of magnetic heads. Attached Figure Description

[0012] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings, wherein: Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the structure from another angle of the present invention; Figure 3 This is a schematic diagram of another embodiment of the present invention. Figure 4 for Figure 3 Enlarged view of point A in the middle; In the diagram: 1. Base plate; 2. Support ring; 3. Fixing ring; 4. Gear rack; 5. Rotary motor; 6. Gear; 7. Fixing groove; 8. Through hole; 9. Insertion hole; 10. Connecting column; 11. Baffle; 12. Test window; 13. Bracket; 14. Test cylinder; 15. Test plate; 16. Connecting hole; 17. Discharge cylinder; 18. Top plate; 19. Push rod; 20. Sliding plate; 21. Lead screw; 22. Sliding rod; 23. Positioning motor; 24. Slide table; 25. Threaded pipe; 26. Support pipe; 27. Rotating shaft; 28. Test motor; 29. ​​Circular ring; 30. Shielding cover; Detailed Implementation

[0013] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings: Example

[0014] like Figures 1 to 2As shown, this embodiment discloses a magnetic head testing device, comprising a base plate 1, with support rings 2 symmetrically fixed on both sides of the upper part of the base plate 1, and a fixed ring 3 rotatably connected to the support rings 2 between the two support rings 2. The fixed ring 3 is driven to rotate by a rotary motor 5. The fixed ring 3 is provided with multiple fixing devices, each including a fixing groove 7 on the surface of the fixed ring 3, and an insertion hole 9 at the bottom of the fixing groove 7. A connecting post 10 connected to the insertion hole 9 is also provided on the inner wall of the fixed ring 3. A bracket 13 is also fixed on the base plate 1, and multiple test cylinders 14 are fixed on the bracket 13. A test plate 15 is also provided inside the fixed ring 3. The piston rod ends of the test cylinders 14 are all fixed to the test plate 15. A connecting post 10 is provided on the test plate 15 at a position corresponding to the connecting post 10. Hole 16, a lead screw 21 and multiple sliding rods 22 are also provided on the base plate 1, and a slide table 24 is also provided above the base plate 1. Threaded tubes 25 are fixed on the slide table 24 at positions corresponding to the lead screw 21. The lead screw 21 passes through the threaded tubes 25 and is threadedly connected to the threaded tubes 25. A support tube 26 is also fixed on the slide table 24. The sliding rods 22 pass through the support tubes 26 and are slidably connected to the support tubes 26. A rotating shaft 27 is also provided above the slide table 24. The rotating shaft 27 is driven to rotate by a test motor 28. Circular rings 29 are also uniformly fixed on the rotating shaft 27. Magnetic strips are uniformly fixed on the outer surface of the circular rings 29. Each magnetic strip is covered with a shielding cover 30. The magnetic permeability of the shielding covers on the same circular ring 29 is different, and the magnetic permeability of each shielding cover 30 gradually increases along the direction of the circular ring 29.The magnetic heads to be tested are sequentially inserted into the corresponding fixed slots 7, and the pins on the magnetic heads are inserted into the corresponding sockets 9. After the pins are aligned with the connecting posts 10, the fixed ring 3 is rotated by the rotary motor 5 to a certain angle, and the magnetic heads are inserted again into the row of fixed slots 7 of the fixed ring 3. This process is repeated until a row of magnetic heads reaches the position of the test board 15. Then, the test cylinder 14 is activated, the piston rod on the test cylinder 14 extends, the test board 15 moves, and the connecting posts 10 are inserted into the corresponding connecting holes 16, thus connecting the pins on the magnetic heads with the test board 15. The test board 15 provides power to the magnetic heads and transmits the information read by the magnetic heads to the computer for comparison. The rotating shaft 27 is rotated by the test motor 28, and the magnetic strips on the ring 29 sequentially pass through the corresponding magnetic head positions. Eddy currents are formed in the magnetic strips within the magnetic head's magnetic field. The sensing chip on the magnetic head senses the eddy currents, thus achieving the purpose of the magnetic head sensing the magnetic strips. The magnetic head reads the corresponding magnetic strip information, thereby completing the magnetic head test. The magnetic strips are covered with a shield. The shield 30 has a magnetic permeability that gradually increases along the surface of the ring 29. The eddy current effect generated by the high magnetic permeability shield 30 attenuates the electromagnetic field, and the eddy current itself also generates a magnetic field, which cancels the magnetic field of the magnetic strip, thereby attenuating the magnetic field radiated by the magnetic strip. By attenuating the magnetic field, interference between adjacent magnetic strips is avoided and the magnetic field is weakened, thus achieving the sensitivity test of the magnetic head. The positioning motor 23 drives the lead screw 21 to rotate a certain number of turns to adjust the distance between the magnetic head and the magnetic strip. When the appropriate distance is adjusted, the magnetic head can still sense the contents of each magnetic strip, and the magnetic head has high sensitivity. After one row of magnetic heads is tested, the test cylinder 14 is started, the piston rod on the test cylinder 14 is shortened, the test plate 15 is separated from the corresponding connecting post 10, and the rotary motor 5 drives the fixed ring 3 to rotate a certain angle again. The next row of magnetic heads arrives at the position of the test plate 15, and the cycle continues. This device can test the magnetic head and can perform sensitivity tests on a row of magnetic heads at once, which greatly improves the testing efficiency of the magnetic head.

[0015] Among them, a circular rack 4 is fixed on the fixed ring 3, and a gear 6 is fixed on the output end of the rotary motor 5. The gear 6 meshes with the circular rack 4.

[0016] The bracket 13 is also equipped with multiple discharge cylinders 17. Each of the fixed grooves 7 has a through hole 8 penetrating the fixed ring 3. A top plate 18 is also provided inside the fixed ring 3. The piston rod ends of the discharge cylinders 17 are fixed to the top plate 18. A push rod 19 is fixed at the bottom of the top plate 18 at a position corresponding to the through hole 8. When the tested magnetic head reaches the lowest position of the fixed ring 3, the discharge cylinder 17 is activated, the piston rod on the discharge cylinder 17 extends, and the push rod 19 moves. The push rod 19 passes through the through hole 8 at the corresponding position and pushes the magnetic head out of the fixed groove 7. Example

[0017] This embodiment discloses a magnetic head testing device. Based on the structure and principle of Embodiment 1, this embodiment further includes a baffle 11 on one side of the fixing ring 3. The baffle 11 is fixed to the support ring 2, and a test window 12 penetrating the baffle 11 is provided on the baffle 11 at the test plate 15 position. The baffle 11 prevents the magnetic head in the fixing groove 7 from falling out of the fixing groove 7 when the fixing ring 3 rotates. Example

[0018] like Figure 3 and Figure 4 As shown, this embodiment discloses a magnetic head testing device. Based on the structure and principle of Embodiment 1 or Embodiment 2, this embodiment also has a sliding plate 20 fixed obliquely on the base plate 1 below the fixing ring 3. The tested magnetic head falls onto the sliding plate 20 and is collected after sliding down the sliding plate 20.

[0019] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A magnetic head testing device, characterized in that, The device includes a base plate, on which support rings are symmetrically fixed on both sides. A fixed ring, rotatably connected to the support rings, is positioned between the two support rings. The fixed ring is driven to rotate by a rotary motor. Multiple fixing devices are provided on the fixed ring, each including a fixing groove on its surface and an insertion hole at the bottom of the groove. A connecting post, connected to the insertion hole, is also provided on the inner wall of the fixed ring. A bracket is fixed to the base plate, and multiple test cylinders are fixed on the bracket. A test plate is also placed inside the fixed ring, and the piston rod ends of each test cylinder are fixed to the test plate. The test plate is provided with connection holes at positions corresponding to the connecting columns. The base plate is also provided with a lead screw and multiple sliding rods. A slide table is provided above the base plate. Threaded tubes are fixed on the slide table at positions corresponding to the lead screw. The lead screw passes through the threaded tubes and is threadedly connected to them. A support tube is also fixed on the slide table. The sliding rods pass through the support tubes and are slidably connected to them. A rotating shaft is provided above the slide table. The rotating shaft is driven to rotate by a test motor. Circular rings are uniformly fixed on the rotating shaft. Magnetic strips are uniformly fixed on the outer surface of the circular rings. Each magnetic strip is covered with a shielding cover.

2. The magnetic head testing device according to claim 1, characterized in that: A circular rack is fixed on the fixed ring, and a gear is fixed on the output end of the rotary motor. The gear meshes with the circular rack.

3. The magnetic head testing device according to claim 1, characterized in that: The bracket is also fixed with multiple discharge cylinders. The bottom of the fixing groove is provided with a through hole that passes through the fixing ring. A top plate is also provided inside the fixing ring. The piston rod end of the discharge cylinder is fixed to the top plate. A top rod is fixed at the bottom of the top plate at the position corresponding to the through hole.

4. The magnetic head testing device according to claim 1, characterized in that: A baffle is also provided on one side of the fixing ring. The baffle is fixed to the support ring. A test window that penetrates the baffle is also provided on the baffle at the test plate position.

5. The magnetic head testing device according to claim 1, characterized in that: A sliding plate is also fixed at an incline on the base plate below the fixing ring.

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