A method and apparatus for magnetizing a multi-row magnetic track magnetic sealing ring

Abstract

The application provides a magnetizing method and equipment for a multi-row magnetic track magnetic sealing ring, and belongs to the field of magnetic sealing ring manufacturing. The technical scheme is as follows: according to the row position of the magnetic track to be magnetized, a whole three-claw magnetizing head or a middle-row split three-claw magnetizing head is selected, the radial side surface of the magnetizing head is tangent to the edge of the corresponding magnetic track, the lower planes of the three claw-shaped protrusions are attached to the upper surface of the sealing ring, and the N and S pole pairs are formed by positive and negative pole energization during the rotation of the sealing ring; the equipment comprises a positioning clamp, a rotating motor, an encoder, a control system, a magnetizing power supply and a plurality of magnetizing heads arranged in the circumferential direction of the sealing ring axis. The application has the advantages that the magnetic field interference of adjacent magnetic tracks can be reduced, the magnetization of two rows and more than three rows of magnetic tracks can be adapted, the consistency of the magnetic pole position and width can be improved, different specifications of products can be adapted by replacing the split claws, and the production efficiency can be improved by the separate or simultaneous action of the plurality of magnetizing heads.

Description

Technical Field

[0001] This invention relates to the field of magnetic field, and more particularly to a method and apparatus for magnetizing a multi-row magnetic sealing ring. Background Technology

[0002] Magnetic sealing rings, also known as magnetic encoders, typically obtain motion information such as speed and position of equipment or vehicles by rotating or moving them, causing changes in the magnetic poles in their surface tracks. Most existing magnetic sealing rings have a single-row magnetic track structure, meaning multiple N and S pole pairs are formed along the circumference of a single annular magnetic track. For this type of single-row magnetic sealing ring, existing magnetization methods usually only require magnetization positioning and pole formation for a single track, making the magnetization head structure and equipment control relatively simple.

[0003] As application scenarios demand higher speed, position detection accuracy, and multi-signal output capabilities, multi-row magnetic sealing rings with two or more rows of magnetic tracks on the same magnetic sealing ring have emerged. These magnetic sealing rings typically consist of magnetic rubber and an iron ring, with the magnetic rubber bonded to the iron ring and multiple rows of magnetic tracks extending circumferentially formed on the surface of the magnetic rubber. While the multi-row magnetic track structure can meet the needs of higher precision or multi-channel detection, its magnetization process is significantly more complex than that of a single-row magnetic track.

[0004] First, the number of pole pairs may differ between different magnetic tracks, and the control parameters and magnetization rhythm for each track during the magnetization process need to be adapted separately. If the traditional single-track magnetization method is still used, it will be difficult to meet the magnetization requirements of different tracks.

[0005] Secondly, when multiple rows of magnetic tracks are arranged adjacent to each other in the radial direction, if the positioning between the magnetizing head and the corresponding magnetic track is inaccurate when the magnetizing head is magnetizing one row of magnetic tracks, or if the magnetic field generated by the magnetizing head spreads to the adjacent magnetic track area, it is easy to cause magnetic field interference between adjacent magnetic tracks, affecting the consistency of magnetic pole position, magnetic pole width and magnetization intensity.

[0006] Secondly, traditional single-row magnetic track filling heads are usually designed for a single magnetic track, and their structure is not convenient to be directly adapted to multiple rows of magnetic tracks, especially in magnetic sealing rings with three or more rows of magnetic tracks. The middle row of magnetic tracks is located between the inner and outer rows of magnetic tracks, and the filling head needs to consider the width of the middle row of magnetic tracks, the boundaries of adjacent magnetic tracks, and the replacement and adaptation issues of different specifications of products at the same time.

[0007] Furthermore, if the magnetization of multiple rows of magnetic tracks is completed sequentially, i.e., one row of magnetic tracks is completed before the next row is completed, the magnetization time of the product will increase with the number of magnetic track rows, resulting in reduced production efficiency and hindering the mass production of multi-row magnetic sealing rings.

[0008] Therefore, it is necessary to provide a magnetization method and corresponding magnetization equipment suitable for multi-row magnetic sealing rings, so that the corresponding magnetization head structure can be adopted according to different rows of magnetic tracks, and the magnetic field interference between adjacent magnetic tracks can be reduced by accurate positioning and fitting magnetization, while improving the magnetization efficiency of multi-row magnetic sealing rings. Summary of the Invention

[0009] The purpose of this invention is to provide a magnetization method and apparatus for a multi-row magnetic sealing ring.

[0010] This invention is achieved through the following measures: A method for magnetizing a multi-row magnetic sealing ring, wherein the upper surface of the multi-row magnetic sealing ring is provided with two or more rows of magnetic tracks, and the magnetizing method is used to form multiple N and S magnetic pole pairs arranged in a circumferential direction on each row of magnetic tracks, characterized by comprising the following steps: The corresponding magnetizing head is determined according to the arrangement of the magnetic tracks to be magnetized on the multi-row magnetic sealing ring. Specifically, when the multi-row magnetic sealing ring has two rows of magnetic tracks, an integral three-jaw magnetizing head is used to magnetize the two rows of magnetic tracks respectively; when the multi-row magnetic sealing ring has three or more rows of magnetic tracks, the integral three-jaw magnetizing head is used to magnetize the inner and outer rows of magnetic tracks, and a split three-jaw magnetizing head is used to magnetize the middle row of magnetic tracks located between the inner and outer rows of magnetic tracks. Adjust the position of the corresponding magnetizing head and the multi-row magnetic sealing ring. Through the limiting device arranged radially along the multi-row magnetic sealing ring, make one radial side of the corresponding magnetizing head tangent and flush with the edge of the magnetic track to be magnetized, and make the lower plane of the three claw-shaped protrusions of the corresponding magnetizing head perpendicular to the axis of the multi-row magnetic sealing ring and in contact with the upper surface of the multi-row magnetic sealing ring. The multi-row magnetic sealing ring is installed and rotated around the axis. During the rotation of the multi-row magnetic sealing ring, current is passed to the corresponding magnetizing head according to the positive and negative poles. N and S pole pairs are magnetized on the surface of the magnetic track to be magnetized, and the two or more rows of magnetic tracks are magnetized respectively.

[0011] The invention also has the following specific features: The multi-row magnetic sealing ring is composed of magnetic rubber and an iron ring. The magnetic rubber is bonded to the iron ring by vulcanization. The magnetic rubber is one of the following: a mixture of ferrite and rubber, or a mixture of other magnetic materials and rubber.

[0012] The integral three-claw magnetizing head includes an iron core and a coil. One end of the iron core is provided with a first claw-shaped protrusion, a second claw-shaped protrusion, and a third claw-shaped protrusion located between the first claw-shaped protrusion and the second claw-shaped protrusion. The lower planes of the first claw-shaped protrusion, the second claw-shaped protrusion, and the third claw-shaped protrusion are located in the same plane. The third claw-shaped protrusion is wound around the coil and connected to the power supply. The other end of the iron core is a solid body formed by fusing the first claw-shaped protrusion, the second claw-shaped protrusion, and the third claw-shaped protrusion.

[0013] A first discharge gap is formed between the second claw-shaped protrusion and the third claw-shaped protrusion, and a second discharge gap is formed between the first claw-shaped protrusion and the third claw-shaped protrusion. The first discharge gap and the second discharge gap are equal. Both the first claw-shaped protrusion and the second claw-shaped protrusion are acute-angled structures, with one of the sharp corners of the acute-angled structure located on the corresponding lower plane. The third claw-shaped protrusion is a columnar protrusion with a rectangular cross-section. The first claw-shaped protrusion, the second claw-shaped protrusion, and the third claw-shaped protrusion form two sets of magnetization pole pairs, and three adjacent magnetic poles are formed each time a discharge occurs.

[0014] When the integral three-jaw magnetizing head is used to magnetize the outer magnetic track, the radial side of the integral three-jaw magnetizing head is tangent to the inner circle of the outer magnetic track, and the neutral surface of the third claw-shaped protrusion passes through the axis of the multi-row magnetic track magnetic sealing ring; when the integral three-jaw magnetizing head is used to magnetize the inner magnetic track, the radial side of the integral three-jaw magnetizing head is tangent to the outer circle of the inner magnetic track, and the neutral surface of the third claw-shaped protrusion passes through the axis of the multi-row magnetic track magnetic sealing ring.

[0015] The intermediate row split-type three-jaw magnetizing head includes an iron core base, a first split jaw, a second split jaw, and a third split jaw. The first split jaw is connected to the first claw-shaped protrusion of the intermediate row split-type three-jaw magnetizing head by a screw. The second split jaw is connected to the second claw-shaped protrusion of the intermediate row split-type three-jaw magnetizing head by a screw. The third split jaw is connected to the iron core base by a screw. When changing the specifications of the multi-row magnetic sealing ring, the specifications of the intermediate row split-type three-jaw magnetizing head are made to correspond with the specifications of the intermediate row magnetic tracks by replacing the first split jaw, the second split jaw, and the third split jaw.

[0016] The side of the middle row split-type three-jaw magnetizing head is provided with a limiting surface. The positional relationship between the middle row split-type three-jaw magnetizing head and the middle row magnetic track is adjusted by the limiting surface, so that the side of the first split claw, the second split claw and the third split claw are tangent to the corresponding edge of the middle row magnetic track; the radial width of the first split claw, the second split claw and the third split claw are all the same as the width of the middle row magnetic track, and the lower plane of the first split claw, the second split claw and the third split claw are all in contact with the upper surface of the multi-row magnetic sealing ring.

[0017] Multiple magnetizing heads, determined according to the arrangement of the magnetic tracks to be magnetized, are used to magnetize two or more rows of magnetic tracks. The multiple magnetizing heads are arranged in a circumferential plane with the axis of the magnetic sealing ring of the multiple rows of magnetic tracks as the center. Each magnetizing head corresponds to a specific row of magnetic tracks and can be adjusted individually so that one radial side of each magnetizing head is tangent and flush with the edge of the corresponding row of magnetic tracks. The multiple magnetizing heads can operate individually or simultaneously. When the multiple magnetizing heads operate simultaneously, they magnetize two or more rows of magnetic tracks at the same time as the magnetic sealing ring of the multiple rows of magnetic tracks rotates.

[0018] The device includes a positioning fixture, a rotary motor, an encoder, a control system, a magnetizing power supply, and multiple magnetizing heads. The positioning fixture is used to install the multi-row magnetic sealing rings. The rotary motor is used to drive the positioning fixture to rotate. The encoder is used to control the rotary motor to rotate at a uniform speed, record the stop position, and feed back a signal to the control system. The magnetizing power supply is connected to the magnetizing heads. Multiple magnetizing heads are arranged in a circumferential plane with the axis of the multi-row magnetic sealing ring as the center. Each magnetizing head can be adjusted individually so that one radial side of each magnetizing head is tangent and flush with the edge of the corresponding row of magnetic tracks. The plurality of magnetizing heads include an integral three-jaw magnetizing head, which includes an iron core and a coil. One end of the iron core is provided with a first claw-shaped protrusion, a second claw-shaped protrusion, and a third claw-shaped protrusion located between the first claw-shaped protrusion and the second claw-shaped protrusion. The lower planes of the first claw-shaped protrusion, the second claw-shaped protrusion, and the third claw-shaped protrusion are located in the same plane. The third claw-shaped protrusion is wound around the coil and connected to the magnetizing power supply. The other end of the iron core is a solid body formed by fusing the first claw-shaped protrusion, the second claw-shaped protrusion, and the third claw-shaped protrusion. The integral three-jaw magnetizing head is used to magnetize the two rows of magnetic tracks of a two-row magnetic sealing ring, or to magnetize the inner and outer magnetic tracks of a three-row or more magnetic sealing ring. When the magnetizing device is used for magnetic sealing rings with three or more magnetic tracks, the plurality of magnetizing heads also include a middle row split-type three-jaw magnetizing head. The middle row split-type three-jaw magnetizing head is used to magnetize the middle row of magnetic tracks located between the inner and outer magnetic tracks. The middle row split-type three-jaw magnetizing head includes an iron core base, a first split claw, a second split claw, and a third split claw. The first split claw is connected to the first claw-shaped protrusion of the middle row split-type three-jaw magnetizing head by a screw. The second split claw is connected to the second claw-shaped protrusion of the middle row split-type three-jaw magnetizing head by a screw. The third split claw is connected to the iron core base by a screw.

[0019] When the magnetization device is used for two rows of magnetic sealing rings, the magnetization device also includes a magnetization parameter interface. Both the control system and the magnetization parameter interface are set to dual channels. There are two magnetization power supplies and two integrated three-jaw magnetization heads. The two magnetization power supplies are respectively connected to the two integrated three-jaw magnetization heads and charge and discharge their respective integrated three-jaw magnetization heads. The two integrated three-jaw magnetization heads magnetize the two rows of magnetic tracks respectively.

[0020] The beneficial effects of this invention are: it can reduce magnetic field interference between adjacent magnetic tracks, adapt to magnetization of two or more rows of magnetic tracks, improve the consistency of magnetic pole position and width, and adapt to different specifications of products through the replacement of split claws, and improve production efficiency through the individual or simultaneous operation of multiple magnetizing heads. By selecting either an integral three-jaw magnetizing head or a split-type three-jaw magnetizing head based on the magnetic track arrangement, and ensuring that the radial side of the magnetizing head is tangent and flush with the edge of the corresponding magnetic track, and that the lower plane of the claw-shaped protrusion is in contact with the upper surface of the sealing ring, the positioning accuracy of the magnetizing head relative to the corresponding magnetic track can be improved, and magnetic field interference between adjacent magnetic tracks can be reduced. The integral three-jaw magnetizing head forms two sets of magnetization pole pairs through three claw-shaped protrusions, which is beneficial to improving the magnetization intensity or current utilization rate, and maintaining the stability of the magnetic pole width and magnetization intensity. The split-type three-jaw magnetizing head in the middle row can be adapted to different specifications of middle row magnetic tracks by changing the split claws, reducing the difficulty of changing the type. Multiple magnetizing heads are arranged in a plane along the circumferential direction of the sealing ring axis and can operate individually or simultaneously, which can improve the magnetization efficiency of multi-row magnetic sealing rings. Attached Figure Description

[0021] Figure 1 A schematic diagram showing the magnetization state of a multi-row magnetic sealing ring and an integral three-jaw magnetizing head; Figure 2 A schematic diagram of the structure of an integrated three-jaw magnetic charging head; Figure 3 A schematic diagram of the claw-shaped protrusions and discharge gap of the integral three-claw charging head; Figure 4A schematic diagram of the structure and principle of a magnetization device with two rows of magnetic sealing rings; Figure 5 A schematic diagram showing the magnetization and positioning of the outer magnetic track of the two rows of magnetic sealing rings; Figure 6 A schematic diagram showing the magnetization and positioning of the inner magnetic track of the two rows of magnetic sealing rings. Figure 7 A schematic diagram showing the magnetization state of the middle row of magnetic tracks in a three-row magnetic sealing ring; Figure 8 A schematic diagram of the structure of the middle row split three-jaw magnetizing head; Figure 9 This is a schematic diagram showing the positioning relationship between the split three-jaw magnetizing head in the middle row and the magnet track in the middle row.

[0022] The attached figures are labeled as follows: Example 1 and Example 2: 1. Multi-row magnetic sealing ring; 101. First row of magnetic tracks; 102. Second row of magnetic tracks; 103. Third row of magnetic tracks; 104. Magnetic rubber; 105. Iron ring; 2. Iron core; 3. Coil; 201. First claw-shaped protrusion; 202. Second claw-shaped protrusion; 203. Third claw-shaped protrusion; 4. First discharge gap; 5. Second discharge gap; 6. Axis of the magnetic sealing ring; 7. Radial side; 8. Neutral surface of the third claw-shaped protrusion. 9. Two rows of magnetic track magnetic sealing rings; 10. Positioning clamp; 11. Rotary motor and encoder; 12. Control system; 13. Magnetizing power supply; 14. Magnetizing parameter interface; 15. First integrated three-jaw magnetizing head; 16. Second integrated three-jaw magnetizing head; 1201. First control channel; 1202. Second control channel; 1401. First magnetic track parameter setting area; 1402. Second magnetic track parameter setting area; 1301. First magnetizing power supply; 1302. Second magnetizing power supply; 17. Inner circle of the outer magnetic track; 18. Outer circle of the inner magnetic track.

[0023] Example 3: 31. Multi-row magnetic sealing ring; 32. First row of magnetic tracks; 33. Second row of magnetic tracks; 34. Third row of magnetic tracks; 35. First claw-shaped protrusion; 36. Second claw-shaped protrusion; 37. First split claw; 38. Second split claw; 39. Third split claw; 40. Limiting surface; 41. Side of the first split claw; 42. Side of the second split claw; 43. Side of the third split claw; 44. Corresponding edge of the middle row of magnetic tracks; 45. Radial width of the split claw; 46. Width of the middle row of magnetic tracks; 47. Lower plane of the first split claw; 48. Lower plane of the second split claw; 49. Lower plane of the third split claw. Detailed Implementation

[0024] To clearly illustrate the technical features of this solution, the following detailed implementation method will be used to describe the solution.

[0025] Example 1 This embodiment provides a magnetization method for a multi-row magnetic sealing ring, which is used to form multiple N and S magnetic pole pairs arranged in a circumferential direction on each row of magnetic tracks of the multi-row magnetic sealing ring.

[0026] like Figures 1 to 3 As shown, the multi-row magnetic sealing ring 1 is composed of magnetic rubber 104 and an iron ring 105. The magnetic rubber 104 is bonded to the iron ring 105 by vulcanization. The magnetic rubber 104 is one of the following: a mixture of ferrite and rubber, or a mixture of other magnetic materials and rubber. The upper surface of the multi-row magnetic sealing ring 1 is provided with two or more rows of magnetic tracks, each row of magnetic tracks being used to form multiple N and S pole pairs arranged along the circumferential direction.

[0027] In the illustrated three-row magnetic track configuration, the three rows of magnetic tracks are designated as the first row 101, the second row 102, and the third row 103, arranged sequentially along the radial direction of the multi-row magnetic sealing ring 1. The first row 101 and the third row 103 are located on opposite sides of the radial direction, while the second row 102 is located between the first row 101 and the third row 103. The reference numerals 101, 102, and 103 are used to indicate different rows of magnetic tracks and do not limit the multi-row magnetic sealing ring 1 to having only three rows of magnetic tracks.

[0028] In this embodiment, an integral three-jaw magnetizing head is used to magnetize the magnetic track to be magnetized. The integral three-jaw magnetizing head includes an iron core 2 and a coil 3. One end of the iron core 2 is provided with a first claw-shaped protrusion 201, a second claw-shaped protrusion 202, and a third claw-shaped protrusion 203. The third claw-shaped protrusion 203 is located between the first claw-shaped protrusion 201 and the second claw-shaped protrusion 202. The lower planes of the first claw-shaped protrusion 201, the second claw-shaped protrusion 202, and the third claw-shaped protrusion 203 are located in the same plane. The third claw-shaped protrusion 203 is wound around the coil 3 and connected to the power supply. The other end of the iron core 2 is a solid body formed by fusing the first claw-shaped protrusion 201, the second claw-shaped protrusion 202, and the third claw-shaped protrusion 203.

[0029] A first discharge gap 4 is formed between the second claw-shaped protrusion 202 and the third claw-shaped protrusion 203, and a second discharge gap 5 is formed between the first claw-shaped protrusion 201 and the third claw-shaped protrusion 203. The first discharge gap 4 and the second discharge gap 5 are equal in size. The sizes of the first discharge gap 4 and the second discharge gap 5 are made into three series: 1.3, 1.1, and 0.9, to meet the magnetization requirements of magnetic sealing ring products of different specifications.

[0030] Both the first claw-shaped protrusion 201 and the second claw-shaped protrusion 202 are acute-angled structures, with the sharp corner of each protrusion located on its corresponding lower plane to achieve sharp-angle discharge. The third claw-shaped protrusion 203 is a columnar protrusion with a rectangular cross-section, ensuring that its cross-sectional dimensions and shape do not easily change even if wear occurs during magnetization, thus helping to maintain the magnetic pole width and magnetic pole strength of the magnetized product.

[0031] During magnetization, the multi-row magnetic sealing ring 1 is installed and rotated around axis 6 to adjust the position of the integral three-jaw magnetizing head and the multi-row magnetic sealing ring 1. The integral three-jaw magnetizing head has a radial side 7, and the third claw-shaped protrusion 203 has a neutral surface 8. By using a limiting device arranged radially along the multi-row magnetic sealing ring 1, the radial side 7 of the integral three-jaw magnetizing head is made tangent and flush with the edge of the magnetic track to be magnetized, and the lower planes of the first claw-shaped protrusion 201, the second claw-shaped protrusion 202, and the third claw-shaped protrusion 203 are made perpendicular to the axis 6 of the multi-row magnetic sealing ring 1 and in contact with the upper surface of the multi-row magnetic sealing ring 1.

[0032] During the rotation of the multi-row magnetic sealing ring 1, current is passed to the integral three-jaw magnetizing head according to the positive and negative poles. The integral three-jaw magnetizing head magnetizes the surface of the magnetic track to be magnetized with N and S pole pairs. The first claw-shaped protrusion 201, the second claw-shaped protrusion 202 and the third claw-shaped protrusion 203 form two sets of magnetized pole pairs. Each discharge forms three adjacent magnetic poles, and the arrangement of the three adjacent magnetic poles is NSN or SNS.

[0033] During the magnetization process described above, since the lower surfaces of the first claw-shaped protrusion 201, the second claw-shaped protrusion 202, and the third claw-shaped protrusion 203 are in contact with the upper surface of the multi-row magnetic sealing ring 1, the magnetic field of the integral three-claw magnetizing head is mainly concentrated within the iron core 2 and coupled and magnetized with the magnetic material in the multi-row magnetic sealing ring 1, thereby reducing magnetic field interference between adjacent magnetic tracks.

[0034] In this embodiment, the integral three-jaw magnetizing head is used to magnetize the two rows of magnetic tracks in a two-row magnetic sealing ring, and also for magnetizing the inner and outer magnetic tracks in a three-row or more magnetic sealing ring. For different magnetic tracks to be magnetized, the positional relationship between the integral three-jaw magnetizing head and the corresponding magnetic track is adjusted so that the radial side 7 of the integral three-jaw magnetizing head is tangent and flush with the edge of the corresponding magnetic track, and the magnetization of the corresponding magnetic track is completed during the rotation of the multi-row magnetic sealing ring 1.

[0035] Example 2 This embodiment, based on Embodiment 1, further illustrates the magnetization method of the two rows of magnetic sealing rings and the corresponding magnetization equipment configuration.

[0036] like Figures 1 to 6 As shown, the upper surface of the magnetic sealing ring 9 has two rows of magnetic tracks, including an outer track and an inner track. These tracks form multiple N and S pole pairs arranged circumferentially. When magnetizing the magnetic sealing ring 9, to reduce magnetic field interference between adjacent tracks, the integral three-jaw magnetizing head must be accurately positioned relative to the magnetic sealing ring 9.

[0037] In this embodiment, the magnetization device includes a positioning fixture 10, a rotary motor and encoder 11, a control system 12, a magnetization power supply 13, a magnetization parameter interface 14, and two integrated three-jaw magnetizing heads. Each integrated three-jaw magnetizing head includes an iron core 2 and a coil 3. Two rows of magnetic track magnetic sealing rings 9 are mounted on the positioning fixture 10. The rotary motor and encoder 11 drive the positioning fixture 10 to rotate, thereby driving the two rows of magnetic track magnetic sealing rings 9 to rotate around its axis 6. The rotary motor and encoder 11 are used to control the two rows of magnetic track magnetic sealing rings 9 to rotate at a uniform speed, record the stop position, and feed back signals to the control system 12.

[0038] Figure 2 In this system, the two integrated three-jaw magnetizing heads are designated as the first integrated three-jaw magnetizing head 15 and the second integrated three-jaw magnetizing head 16. The control system 12 includes a first control channel 1201 and a second control channel 1202, which correspond to the magnetization control of the two rows of magnetic tracks, respectively. The magnetization parameter interface 14 includes a first magnetic track parameter setting area 1401 and a second magnetic track parameter setting area 1402, which correspond to the magnetization parameter settings of the two rows of magnetic tracks, respectively. The magnetization power supply 13 includes a first magnetization power supply 131 and a second magnetization power supply 132. The first magnetization power supply 131 is connected to the first integrated three-jaw magnetizing head 15, and the second magnetization power supply 132 is connected to the second integrated three-jaw magnetizing head 16.

[0039] Both the control system 12 and the magnetization parameter interface 14 are configured as dual channels, with each channel used to control and set parameters for the magnetization process of the two rows of magnetic tracks. The first magnetization power supply 131 charges and discharges the first integrated three-jaw magnetizing head 15, and the second magnetization power supply 132 charges and discharges the second integrated three-jaw magnetizing head 16, so that the first integrated three-jaw magnetizing head 15 and the second integrated three-jaw magnetizing head 16 respectively magnetize the two rows of magnetic tracks.

[0040] When magnetizing the outer magnetic track, adjust the position between the corresponding integral three-jaw magnetizing head and the magnetic sealing rings 9 of the two rows of magnetic tracks, so that the radial side 7 of the integral three-jaw magnetizing head is tangent to the inner circle 17 of the outer magnetic track, and the neutral surface 8 of the third claw-shaped protrusion 203 passes through the axis 6 of the magnetic sealing rings 9 of the two rows of magnetic tracks. At the same time, make the lower planes of the first claw-shaped protrusion 201, the second claw-shaped protrusion 202 and the third claw-shaped protrusion 203 fit against the upper surface of the magnetic sealing rings 9 of the two rows of magnetic tracks.

[0041] When magnetizing the inner track, adjust the position between the corresponding integral three-jaw magnetizing head and the magnetic sealing rings 9 of the two rows of tracks, so that the radial side 7 of the integral three-jaw magnetizing head is tangent to the outer circle 18 of the inner track, and the neutral surface 8 of the third claw-shaped protrusion 203 passes through the axis 6 of the magnetic sealing rings 9 of the two rows of tracks. At the same time, make the lower planes of the first claw-shaped protrusion 201, the second claw-shaped protrusion 202 and the third claw-shaped protrusion 203 fit against the upper surface of the magnetic sealing rings 9 of the two rows of tracks.

[0042] During the rotation of the two rows of magnetic sealing rings 9, the rotary motor and encoder 11 control the two rows of magnetic sealing rings 9 to rotate at a uniform speed, record the stopping position, and feed back signals to the control system 12; the first magnetizing power supply 131 and the second magnetizing power supply 132 respectively charge and discharge their corresponding integral three-jaw magnetizing heads. After the integral three-jaw magnetizing head is connected to the positive and negative poles, N and S pole pairs are magnetized on the surface of the corresponding magnetic track.

[0043] Since the lower plane of the integral three-jaw magnetizing head is in contact with the upper surface of the magnetic sealing rings 9 of the two rows of magnetic tracks, the magnetic field generated by the integral three-jaw magnetizing head is mainly concentrated in the range of the iron core 2 and coupled and magnetized with the magnetic material in the magnetic rubber 104, thereby reducing the magnetic field interference between the two rows of magnetic tracks.

[0044] In this embodiment, by making the radial side 7 of the integral three-claw magnetizing head tangent to the inner circle 17 of the outer magnetic track and the outer circle 18 of the inner magnetic track respectively, and by making the neutral surface 8 of the third claw-shaped protrusion 203 pass through the axis 6 of the magnetic sealing rings 9 of the two rows of magnetic tracks, the magnetizing position of the integral three-claw magnetizing head relative to the corresponding magnetic track can be determined, thereby forming N and S pole pairs arranged in the circumferential direction on the two rows of magnetic tracks respectively.

[0045] Example 3 Based on Examples 1 and 2, this embodiment further illustrates the magnetization method of magnetic sealing rings with three or more magnetic tracks, focusing on the structure, positioning method, planar arrangement and operation mode of the middle row split three-jaw magnetizing head.

[0046] like Figure 7 , 8In the case of a multi-row magnetic sealing ring 31 having three or more rows of magnetic tracks, the magnetic tracks located on both radial sides are designated as inner and outer magnetic tracks, and one or more rows of magnetic tracks located between the inner and outer magnetic tracks are designated as middle magnetic tracks. In the case of three rows of magnetic tracks shown in the figure, the first row of magnetic tracks 32, the second row of magnetic tracks 33, and the third row of magnetic tracks 34 are arranged sequentially along the radial direction of the multi-row magnetic sealing ring 31, wherein the second row of magnetic tracks 33 is located between the first row of magnetic tracks 32 and the third row of magnetic tracks 34 and serves as the middle magnetic track; the first row of magnetic tracks 32 and the third row of magnetic tracks 34 are located on both radial sides and serve as inner and outer magnetic tracks, respectively.

[0047] When magnetizing three or more magnetic tracks, the inner and outer magnetic tracks are magnetized using the integral three-jaw magnetizing head described in Example 1. The magnetizing head structure and magnetization method are the same as those for the two-track magnetic sealing ring. When using the integral three-jaw magnetizing head to magnetize the outer magnetic track, the radial side of the integral three-jaw magnetizing head is tangent to the inner circle of the outer magnetic track, and the neutral surface of the third claw-shaped protrusion is aligned with the axis of the magnetic sealing ring of the outer magnetic track. When using the integral three-jaw magnetizing head to magnetize the inner magnetic track, the radial side of the integral three-jaw magnetizing head is tangent to the outer circle of the inner magnetic track, and the neutral surface of the third claw-shaped protrusion is aligned with the axis of the magnetic sealing ring of the outer magnetic track.

[0048] For the intermediate magnetic track, a split-type three-jaw magnetizing head is used for magnetization. The split-type three-jaw magnetizing head includes an iron core base, a first split jaw 37, a second split jaw 38, and a third split jaw 39. In the split-type three-jaw magnetizing head, the first claw-shaped protrusion 35 and the second claw-shaped protrusion 36 are connecting protrusions on the iron core base of the split-type three-jaw magnetizing head, used to install the corresponding split jaws; the first split jaw 37 is connected to the first claw-shaped protrusion 35 by screws, the second split jaw 38 is connected to the second claw-shaped protrusion 36 by screws, and the third split jaw 39 is connected to the iron core base by screws.

[0049] The first split claw 37, the second split claw 38, and the third split claw 39 constitute the three claw-shaped working parts of the intermediate row split-type three-jaw magnetizing head used for magnetizing the intermediate row of magnetic tracks. When replacing the multi-row magnetic sealing ring 31 of different specifications, the first split claw 37, the second split claw 38, and the third split claw 39 are replaced to make the specifications of the intermediate row split-type three-jaw magnetizing head correspond to the specifications of the intermediate row of magnetic tracks. Therefore, when changing the specifications of products, it is not necessary to replace the entire intermediate row split-type three-jaw magnetizing head; only the corresponding first split claw 37, the second split claw 38, and the third split claw 39 need to be replaced and tightened with screws.

[0050] The side of the split-type three-jaw magnetizing head in the middle row is provided with a limiting surface 40. When magnetizing the middle row of magnetic tracks, the positional relationship between the split-type three-jaw magnetizing head in the middle row and the middle row of magnetic tracks is adjusted by the limiting surface 40, so that the side surface 41 of the first split claw, the side surface 42 of the second split claw, and the side surface 43 of the third split claw are tangent to the corresponding edge 44 of the middle row of magnetic tracks.

[0051] The radial width 45 of the first split claw 37, the second split claw 38, and the third split claw 39 is the same as the width 46 of the middle magnetic track. The lower surface 47 of the first split claw, the lower surface 48 of the second split claw, and the lower surface 49 of the third split claw are in contact with the upper surface of the multi-track magnetic sealing ring 31.

[0052] During the magnetization process of the middle row of magnetic tracks, since the lower plane 47 of the first split claw, the lower plane 48 of the second split claw, and the lower plane 49 of the third split claw are in contact with the upper surface of the magnetic sealing ring 31 of the multi-row magnetic tracks, the magnetic field of the middle row split three-claw magnetizing head is mainly concentrated within the core of the magnetizing head and coupled and magnetized with the magnetic material in the magnetic sealing ring 31 of the multi-row magnetic tracks, thereby reducing the magnetic field interference between the middle row of magnetic tracks and adjacent magnetic tracks.

[0053] like Figure 5 As shown, to improve the magnetization efficiency of the multi-row magnetic sealing ring 31, the magnetization device uses multiple magnetizing heads to magnetize two or more rows of magnetic tracks. The multiple magnetizing heads are arranged in a circumferential plane with the axis of the multi-row magnetic sealing ring 31 as the center. Each magnetizing head corresponds to a specific row of magnetic tracks and can be adjusted individually so that one radial side of each magnetizing head is tangent and flush with the edge of the corresponding row of magnetic tracks.

[0054] Multiple magnetizing heads can operate individually or simultaneously. When multiple magnetizing heads operate individually, they magnetize their respective magnetic tracks. When multiple magnetizing heads operate simultaneously, during the rotation of the multi-row magnetic sealing ring 31, multiple magnetizing heads magnetize their respective magnetic tracks simultaneously, thereby forming N and S pole pairs arranged circumferentially on two or more rows of magnetic tracks.

[0055] In this embodiment, the inner and outer magnetic tracks adopt an integral three-jaw magnetizing head, while the middle magnetic track adopts a middle split three-jaw magnetizing head, so that magnetic tracks in different positions can be magnetized using magnetizing heads with corresponding structures. At the same time, by arranging multiple magnetizing heads in a planar manner along the circumferential direction of the axis of the multi-row magnetic sealing ring 31, and enabling multiple magnetizing heads to operate individually or simultaneously, the magnetization efficiency of the multi-row magnetic sealing ring 31 can be improved while maintaining the magnetization positioning relationship of each row of magnetic tracks.

[0056] The technical features of this invention not described can be implemented by or using existing technology, and will not be repeated here. Of course, the above description is not a limitation of this invention, and this invention is not limited to the examples above. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of this invention should also be within the protection scope of this invention.

Claims

1. A method for magnetizing a multi-row magnetic sealing ring, wherein the upper surface of the multi-row magnetic sealing ring is provided with two or more rows of magnetic tracks, and the magnetizing method is used to form multiple N and S pole pairs arranged in a circumferential direction on each row of the magnetic tracks, characterized in that, Includes the following steps: The corresponding magnetizing head is determined according to the arrangement of the magnetic tracks to be magnetized on the multi-row magnetic sealing ring. Specifically, when the multi-row magnetic sealing ring has two rows of magnetic tracks, an integral three-jaw magnetizing head is used to magnetize the two rows of magnetic tracks respectively; when the multi-row magnetic sealing ring has three or more rows of magnetic tracks, the integral three-jaw magnetizing head is used to magnetize the inner and outer rows of magnetic tracks, and a split three-jaw magnetizing head is used to magnetize the middle row of magnetic tracks located between the inner and outer rows of magnetic tracks. Adjust the position of the corresponding magnetizing head and the multi-row magnetic sealing ring. Through the limiting device arranged radially along the multi-row magnetic sealing ring, make one radial side of the corresponding magnetizing head tangent and flush with the edge of the magnetic track to be magnetized, and make the lower plane of the three claw-shaped protrusions of the corresponding magnetizing head perpendicular to the axis of the multi-row magnetic sealing ring and in contact with the upper surface of the multi-row magnetic sealing ring. The multi-row magnetic sealing ring is installed and rotated around the axis. During the rotation of the multi-row magnetic sealing ring, current is passed to the corresponding magnetizing head according to the positive and negative poles. N and S pole pairs are magnetized on the surface of the magnetic track to be magnetized, and the two or more rows of magnetic tracks are magnetized respectively.

2. The magnetization method for the multi-row magnetic sealing ring according to claim 1, characterized in that, The multi-row magnetic sealing ring is composed of magnetic rubber and an iron ring. The magnetic rubber is bonded to the iron ring by vulcanization. The magnetic rubber is one of the following: a mixture of ferrite and rubber, or a mixture of other magnetic materials and rubber.

3. The magnetization method for the multi-row magnetic sealing ring according to claim 1, characterized in that, The integral three-claw magnetizing head includes an iron core and a coil. One end of the iron core is provided with a first claw-shaped protrusion, a second claw-shaped protrusion, and a third claw-shaped protrusion located between the first claw-shaped protrusion and the second claw-shaped protrusion. The lower planes of the first claw-shaped protrusion, the second claw-shaped protrusion, and the third claw-shaped protrusion are located in the same plane. The third claw-shaped protrusion is wound around the coil and connected to the power supply. The other end of the iron core is a solid body formed by fusing the first claw-shaped protrusion, the second claw-shaped protrusion, and the third claw-shaped protrusion.

4. The magnetization method for the multi-row magnetic sealing ring according to claim 3, characterized in that, A first discharge gap is formed between the second claw-shaped protrusion and the third claw-shaped protrusion, and a second discharge gap is formed between the first claw-shaped protrusion and the third claw-shaped protrusion. The first discharge gap and the second discharge gap are equal. Both the first claw-shaped protrusion and the second claw-shaped protrusion are acute-angled structures, with one of the sharp corners of the acute-angled structure located on the corresponding lower plane. The third claw-shaped protrusion is a columnar protrusion with a rectangular cross-section. The first claw-shaped protrusion, the second claw-shaped protrusion, and the third claw-shaped protrusion form two sets of magnetization pole pairs, and three adjacent magnetic poles are formed each time a discharge occurs.

5. The magnetization method for the multi-row magnetic sealing ring according to claim 3, characterized in that, When the integral three-jaw magnetizing head is used to magnetize the outer magnetic track, the radial side of the integral three-jaw magnetizing head is tangent to the inner circle of the outer magnetic track, and the neutral surface of the third claw-shaped protrusion passes through the axis of the multi-row magnetic track magnetic sealing ring; when the integral three-jaw magnetizing head is used to magnetize the inner magnetic track, the radial side of the integral three-jaw magnetizing head is tangent to the outer circle of the inner magnetic track, and the neutral surface of the third claw-shaped protrusion passes through the axis of the multi-row magnetic track magnetic sealing ring.

6. The magnetization method for the multi-row magnetic sealing ring according to claim 1, characterized in that, The intermediate row split-type three-jaw magnetizing head includes an iron core base, a first split jaw, a second split jaw, and a third split jaw. The first split jaw is connected to the first claw-shaped protrusion of the intermediate row split-type three-jaw magnetizing head by a screw. The second split jaw is connected to the second claw-shaped protrusion of the intermediate row split-type three-jaw magnetizing head by a screw. The third split jaw is connected to the iron core base by a screw. When changing the specifications of the multi-row magnetic sealing ring, the specifications of the middle row split three-claw charging head are made to correspond with those of the middle row magnetic track by replacing the first split claw, the second split claw, and the third split claw.

7. The magnetization method for the multi-row magnetic sealing ring according to claim 6, characterized in that, The side of the middle row split three-claw magnetic charging head is provided with a limiting surface. The positional relationship between the middle row split three-claw magnetic charging head and the middle row magnetic track is adjusted by the limiting surface, so that the sides of the first split claw, the second split claw and the third split claw are tangent to the corresponding edges of the middle row magnetic track. The radial widths of the first split claw, the second split claw, and the third split claw are all the same as the width of the middle row of magnetic tracks, and the lower surfaces of the first split claw, the second split claw, and the third split claw are all in contact with the upper surface of the multi-row magnetic sealing ring.

8. The magnetization method for the multi-row magnetic sealing ring according to claim 1, characterized in that, Multiple magnetizing heads, determined according to the arrangement of the magnetic tracks to be magnetized, are used to magnetize two or more rows of magnetic tracks. The multiple magnetizing heads are arranged in a circumferential plane with the axis of the magnetic sealing ring of the multiple rows of magnetic tracks as the center. Each magnetizing head corresponds to a specific row of magnetic tracks and can be adjusted individually so that one radial side of each magnetizing head is tangent and flush with the edge of the corresponding row of magnetic tracks. The multiple magnetizing heads can operate individually or simultaneously. When the multiple magnetizing heads operate simultaneously, they magnetize two or more rows of magnetic tracks at the same time as the magnetic sealing ring of the multiple rows of magnetic tracks rotates.

9. A magnetization device for multi-row magnetic sealing rings, characterized in that, The device includes a positioning fixture, a rotary motor, an encoder, a control system, a magnetizing power supply, and multiple magnetizing heads. The positioning fixture is used to install the multi-row magnetic sealing rings. The rotary motor is used to drive the positioning fixture to rotate. The encoder is used to control the rotary motor to rotate at a uniform speed, record the stop position, and feed back a signal to the control system. The magnetizing power supply is connected to the magnetizing heads. Multiple magnetizing heads are arranged in a circumferential plane with the axis of the multi-row magnetic sealing ring as the center. Each magnetizing head can be adjusted individually so that one radial side of each magnetizing head is tangent and flush with the edge of the corresponding row of magnetic tracks. The plurality of magnetizing heads include an integral three-jaw magnetizing head, which includes an iron core and a coil. One end of the iron core is provided with a first claw-shaped protrusion, a second claw-shaped protrusion, and a third claw-shaped protrusion located between the first claw-shaped protrusion and the second claw-shaped protrusion. The lower planes of the first claw-shaped protrusion, the second claw-shaped protrusion, and the third claw-shaped protrusion are located in the same plane. The third claw-shaped protrusion is wound around the coil and connected to the magnetizing power supply. The other end of the iron core is a solid body formed by fusing the first claw-shaped protrusion, the second claw-shaped protrusion, and the third claw-shaped protrusion. The integral three-jaw magnetizing head is used to magnetize the two rows of magnetic tracks of a two-row magnetic sealing ring, or to magnetize the inner and outer magnetic tracks of a three-row or more magnetic sealing ring. When the magnetizing device is used for magnetic sealing rings with three or more magnetic tracks, the plurality of magnetizing heads also include a middle row split-type three-jaw magnetizing head. The middle row split-type three-jaw magnetizing head is used to magnetize the middle row of magnetic tracks located between the inner and outer magnetic tracks. The middle row split-type three-jaw magnetizing head includes an iron core base, a first split claw, a second split claw, and a third split claw. The first split claw is connected to the first claw-shaped protrusion of the middle row split-type three-jaw magnetizing head by a screw. The second split claw is connected to the second claw-shaped protrusion of the middle row split-type three-jaw magnetizing head by a screw. The third split claw is connected to the iron core base by a screw.

10. The magnetization device for multi-row magnetic sealing rings according to claim 9, characterized in that, When the magnetization device is used for two rows of magnetic sealing rings, the magnetization device also includes a magnetization parameter interface. Both the control system and the magnetization parameter interface are set to dual channels. There are two magnetization power supplies and two integrated three-jaw magnetization heads. The two magnetization power supplies are respectively connected to the two integrated three-jaw magnetization heads and charge and discharge their respective integrated three-jaw magnetization heads. The two integrated three-jaw magnetization heads magnetize the two rows of magnetic tracks respectively.

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