A magnetic steel installation device and method for large synchronous motor

Abstract

The present invention discloses a magnetic steel installation device and method for a large synchronous motor, which relates to the field of motor technology and includes: a fixing rod, the outer surface of which is provided with threads, and the fixing rod penetrates the motor rotor, and two fixing nuts for fixing the two ends of the motor rotor are threadedly connected to the fixing rod; a guide sleeve and a support sleeve rod are coaxially fixed at both ends of the fixing rod, and the fixing rod, the guide sleeve and the support sleeve rod are fixed in sequence, wherein the guide sleeve and the fixing rod are detachably fixed; an adjusting component, which can be slidably connected to the two guide sleeves; a driving component, which is coaxially arranged inside the guide sleeve and the support sleeve rod; a fitting component, which is arranged in multiples and is arranged on the adjusting component.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular to a magnetic steel installation device and method for a large synchronous motor. Background Art

[0002] Compared with traditional motors, permanent magnet motors have the advantages of simple structure, reliable operation, low loss and high efficiency. With the improvement of the manufacturing process of high-performance permanent magnet materials, permanent magnet materials have been widely used in large-capacity motors. Permanent magnet synchronous motors are mainly composed of stators, rotors and end covers. The rotor is equipped with permanent magnet materials. Permanent magnets installed on the outer surface of the rotor can constitute a protruding permanent magnet synchronous motor. Permanent magnets installed inside the rotor can constitute a built-in permanent magnet synchronous motor.

[0003] The protruding rotor has a simple magnetic circuit structure and low manufacturing cost. However, for large permanent magnet synchronous motors, the permanent magnets are large in size, and the magnetic force between the permanent magnets and between the permanent magnets and ferromagnetic materials is large. It is inconvenient to arrange and adjust the magnetic steel. In addition, the permanent magnets are fragile. At the same time, in order to prevent rust, the surface is usually treated with rust prevention. During the installation process, the permanent magnets are easily damaged and broken, and the coating is damaged by pushing and pulling the ends.

[0004] Therefore, it is necessary to provide a magnetic steel installation device and method for a large synchronous motor to solve the problems raised in the above background technology. Summary of the invention

[0005] To achieve the above object, the present invention provides the following technical solution: a magnetic steel installation device and method for a large synchronous motor, comprising:

[0006] A fixing rod, the outer surface of which is provided with threads, and the fixing rod passes through the motor rotor, and two fixing nuts for fixing the two ends of the motor rotor are threadedly connected to the fixing rod;

[0007] A guide sleeve and a support sleeve are coaxially fixed at both ends of the fixing rod, and the fixing rod, the guide sleeve and the support sleeve are fixed in sequence, wherein the guide sleeve and the fixing rod are detachably fixed;

[0008] An adjustment assembly, slidably connected to the two guide sleeves;

[0009] A driving assembly is coaxially arranged inside the guide sleeve and the supporting sleeve rod;

[0010] The fitting components are arranged in plurality and are disposed on the adjusting component.

[0011] Further, preferably, the adjustment component comprises:

[0012] There are two adjusting blocks, which are respectively slidably sleeved on the two guide sleeves, and an adjusting ring is fixed at one end of the adjusting block, wherein the adjusting ring is located on a side of the adjusting block close to the motor rotor;

[0013] One end of the adjusting rod is hinged on the adjusting ring. The adjusting rods are evenly distributed on the adjusting ring. The other ends of the two adjusting rods symmetrical with respect to the motor rotor are hinged with adjusting sleeves.

[0014] Further, preferably, the adjustment block and the adjustment ring are fixed by buckles, and the relative rotation angle can be adjusted.

[0015] Further, as a preference, the drive assembly comprises:

[0016] A fixed sleeve, interference-fitted inside the support sleeve rod;

[0017] The screw rod is rotatably arranged in the fixing sleeve, and a bearing is arranged between the fixing sleeve and the screw rod.

[0018] Further, as a preference, the end of the screw away from the motor rotor is connected to a driving motor as a driving element, the two screws located at both ends of the motor rotor have different rotation directions, and a plurality of limiting grooves are provided on the fixed sleeve and the guide sleeve, and a driving block is placed in the limiting grooves, one end of the driving block is provided with a thread to cooperate with the screw transmission, and the other end is fixedly connected to the adjusting block.

[0019] Further, as a preference, the laminating component comprises:

[0020] A plurality of driving arc blocks are arranged and sleeved in the adjustment sleeve. The driving arc blocks are distributed around the motor rotor. A through hole and a fixing hole are provided on the inner side of the driving arc block. A cavity is provided inside the driving arc block.

[0021] A fitting arc plate is located inside the driving arc block, and the fitting arc plate is fixed to the driving arc block at the fixing hole through fixing pins;

[0022] An extrusion component has one end extending through the through hole into the inner cavity of the driving arc block, and the other end extending through the fitting arc plate, and is used to adsorb magnetic steel at the extended end of the extrusion component.

[0023] Furthermore, preferably, a limit block for limiting the sliding distance of the adjustment sleeve is provided on the side of the driving arc block, and an external interface for an external cable is opened on the end face of the driving arc block, and the arc length of the fitting arc plate exceeds that of the driving arc block.

[0024] Further, preferably, the extrusion assembly comprises:

[0025] A limiting rod, which can slide radially in the cavity;

[0026] The adsorption plate is fixed on the end of the limiting rod, and a pressure spring is arranged between the adsorption plate and the fitting arc plate.

[0027] Furthermore, as a preference, the metal material of the limit rod can be connected to an external cable through an external interface to attach a strong magnet, and the auxiliary adsorption plate can adsorb and fix the magnetic steel.

[0028] A method for installing a magnetic steel for a large synchronous motor comprises the following steps:

[0029] S1. The motor rotor is sleeved at the middle position of the fixing rod and fixed by a fixing nut;

[0030] S2. The guide sleeve, the support sleeve rod, the drive assembly consisting of the assembly, fixed to both ends of the fixed rod, and the adjustment block and the adjustment ring are pre-installed on the guide sleeve;

[0031] S3. The adjusting rod and the adjusting sleeve are hingedly installed first, and the adjusting sleeve is sleeved on the fitting assembly, and then the other end of the adjusting rod is hinged on the adjusting ring;

[0032] S4. Adjust the relative rotation angles of the adjustment ring and the adjustment block so that the center of the fitting assembly faces the fitting surface of the motor rotor;

[0033] S5. Adsorb the magnetic steel on the adsorption plate, and attach a strong magnet to the limit rod to enhance the adsorption stability;

[0034] S6. Start the drive motor to control the rotation of the screw rod, which is then driven by the drive block so that the adjustment block and the adjustment ring slide synchronously away from each other. The drive arc block is driven by the adjustment rod and the adjustment sleeve to move closer to the center, and then the magnet is attached to the surface of the motor rotor until the end of the arc plate is attached, completing the installation of the magnet;

[0035] S7. Attach a magnetic force opposite to the magnet to the limit rod, so that the adsorption plate is separated from the magnet, adjust the drive motor to reverse, then readjust the relative positions of the adjustment ring and the adjustment block, and re-fix the magnet on the adsorption plate, and repeat the magnet installation.

[0036] Compared with the prior art, the present invention provides a magnetic steel installation device and method for a large synchronous motor, which has the following beneficial effects:

[0037] In the present invention, the bonding components are distributed at circumferential intervals on the outer periphery of the motor rotor through the adjustment component support, and the magnets are installed on the bonding components. This process can effectively avoid the magnetic influence between the magnets and between the magnets and the motor rotor during installation. It is more convenient to initially adjust the position of the magnets. Then, the driving component is used to control the bonding component to shrink toward the center, so that the magnets gradually fit the surface of the motor rotor to complete the installation of the magnets. The bonding component applies a force on the surface of the magnet to fix it. Compared with applying a force on the end face of the magnet, the force area is larger, which can effectively avoid the risk of magnet breakage. At the same time, the magnet is installed in a direct bonding manner to avoid relative sliding between the magnet and the motor rotor, which can effectively avoid coating wear. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings:

[0039] Figure 1 It is a schematic diagram of the overall structure of a magnetic steel installation device and method for a large synchronous motor;

[0040] Figure 2 It is a schematic diagram of the structure of a drive assembly of a magnetic steel installation device and method for a large synchronous motor;

[0041] Figure 3 It is a schematic diagram of the transmission structure of an adjustment component of a magnetic steel installation device and method for a large synchronous motor;

[0042] Figure 4 It is a schematic diagram of the structure of a driving arc block of a magnetic steel installation device and method for a large synchronous motor;

[0043] Figure 5 It is a structural schematic diagram of a bonding component 8 of a magnetic steel mounting device and method for a large synchronous motor;

[0044] Figure 6 It is a structural schematic diagram of an extrusion assembly of a magnetic steel installation device and method for a large synchronous motor;

[0045] In the figure: 1. fixing rod; 2. fixing nut; 3. motor rotor; 4. guide sleeve; 5. support sleeve rod; 6. adjustment assembly; 61. adjustment block; 62. adjustment ring; 63. adjustment rod; 64. adjustment sleeve; 7. driving assembly; 71. fixing sleeve; 711. limiting notch; 72. screw; 73. bearing; 74. driving block; 8. fitting assembly; 81. driving arc block; 811. external interface; 812. limiting block; 813. through hole; 814. fixing hole; 815. cavity; 82. fitting arc plate; 83. fixing nail; 84. extrusion assembly; 841. limiting rod; 842. adsorption plate; 843. pressure spring. DETAILED DESCRIPTION

[0046] See also Figure 1-6 In an embodiment of the present invention, a magnetic steel installation device and method for a large synchronous motor includes:

[0047] A fixing rod 1, the outer surface of which is provided with threads, and the fixing rod 1 passes through the motor rotor 3, and two fixing nuts 2 for fixing the two ends of the motor rotor 3 are threadedly connected to the fixing rod 1;

[0048] A guide sleeve 4 and a support sleeve rod 5 are coaxially fixed at both ends of the fixed rod 1, and the fixed rod 1, the guide sleeve 4 and the support sleeve rod 5 are fixed in sequence, wherein the guide sleeve 4 and the fixed rod 1 are detachably fixed;

[0049] An adjustment assembly 6, slidably connected to the two guide sleeves 4;

[0050] A driving assembly 7, coaxially arranged inside the guide sleeve 4 and the supporting sleeve rod 5;

[0051] The fitting components 8 are arranged in plurality and are disposed on the adjusting component 6 .

[0052] It needs to be explained that the three most commonly used permanent magnet materials in permanent magnet motor manufacturing are aluminum nickel cobalt, ferrite, and rare earth permanent magnet materials. Taking sintered NdFeB as an example of a magnet material among rare earth permanent magnet materials, sintered NdFeB itself has the characteristics of strong magnetic ability, low Curie temperature, easy to rust, and easy to break. The current installation method is to fit the magnet to the rotor and apply force to the end of the magnet to adjust the position of the magnet. Considering that the volume and magnetism of the magnet of large synchronous motors are enhanced, using this method, on the one hand, the smaller cross-section of the magnet end will be subjected to greater pressure, causing the overall breakage of the magnet. On the other hand, the anti-rust coating on the surface of the magnet will be destroyed as the magnet and the rotor surface slide relative to each other.

[0053] In the present application, the motor rotor 3 is first fixed by the fixing rod 1, and at the same time, the bonding component 8 is supported by the adjustment component 6 and distributed at circumferential intervals on the outer periphery of the motor rotor 3, and the magnet is installed on the bonding component 8. This process can effectively avoid the magnetic influence between the magnets and between the magnets and the motor rotor 3 during installation, and the initial adjustment of the position of the magnet is more convenient. Then, the driving component 7 is used to control the bonding component 8 to shrink toward the center, so that the magnet gradually fits the surface of the motor rotor 3 to complete the installation of the magnet. The bonding component 8 applies a force on the surface of the magnet to fix it. Compared with applying a force on the end face of the magnet, the force area is larger, which can effectively avoid the risk of magnet breakage. At the same time, the magnet is installed in a direct bonding manner to avoid relative sliding between the magnet and the motor rotor 3, which can effectively avoid coating wear.

[0054] In this embodiment, Figure 1 , the regulating component 6 comprises:

[0055] There are two adjusting blocks 61, which are respectively slidably sleeved on the two guide sleeves 4, and an adjusting ring 62 is fixed at one end of the adjusting block 61, wherein the adjusting ring 62 is located at a side of the adjusting block 61 close to the motor rotor 3;

[0056] One end of the adjusting rod 63 is hinged on the adjusting ring 62 . The adjusting rods 63 are evenly distributed on the adjusting ring 62 circumferentially, and the other ends of two adjusting rods 63 symmetrical with respect to the motor rotor 3 are hinged with adjusting sleeves 64 .

[0057] As a preferred embodiment, the adjustment block 61 and the adjustment ring 62 are fixed by snap fastenings, and the relative rotation angle can be adjusted. Specifically, considering that multiple magnets need to be installed on the motor rotor 3, in the case of a one-time installation, the magnets are attached to the fitting component 8, and there will be magnetic force between the magnets, which makes adjustment inconvenient. This can be effectively avoided by reducing the number of magnets installed at a single time. At the same time, by adjusting the rotation angles of the adjustment block 61 and the adjustment ring 62, the magnets can be attached to different positions of the motor rotor 3.

[0058] In this embodiment, Figure 2-3 , the driving assembly 7 comprises:

[0059] A fixed sleeve 71 is interference-fitted and arranged inside the supporting sleeve rod 5;

[0060] The screw rod 72 is rotatably disposed in the fixing sleeve 71 , and a bearing 73 is disposed between the fixing sleeve 71 and the screw rod 72 . Specifically, the matching position of the screw rod 72 and the bearing 73 is a non-threaded surface, and the screw rod 72 is supported to rotate by the bearing 73 .

[0061] As a preferred embodiment, the end of the screw 72 away from the motor rotor 3 is connected to a driving motor as a driving element, the two screws 72 located at the two ends of the motor rotor 3 have different rotation directions, and the fixed sleeve 71 and the guide sleeve 4 are provided with a plurality of limiting slots 711, and a driving block 74 is arranged in the limiting slots 711. Specifically, the movable range of the driving block 74 is limited by the limiting slots 711, and one end of the driving block 74 is provided with a thread to cooperate with the screw 72 for transmission, and the other end is fixedly connected to the adjusting block 61. Specifically, in order to ensure that the magnetic steel is parallelly attached to the surface of the motor rotor 3, the fitting component 8 needs to remain non-deflected and synchronously shrink toward the center, and the screws 72 with two different options rotate synchronously, so that the adjusting blocks 61 located on both sides of the motor rotor 3 are synchronously moved away from or approached from each other, thereby controlling the movement of the fitting component 8.

[0062] In this embodiment, Figure 4-5 , the fitting assembly 8 comprises:

[0063] The driving arc blocks 81 are arranged in a plurality and sleeved in the adjusting sleeve 64. The driving arc blocks 81 are distributed around the motor rotor 3. A through hole 813 and a fixing hole 814 are formed inside the driving arc blocks 81. A cavity 815 is formed inside the driving arc blocks 81.

[0064] The fitting arc plate 82 is located inside the driving arc block 81, and the fitting arc plate 82 is fixed to the driving arc block 81 at the fixing hole 814 through the fixing nail 83;

[0065] One end of the extrusion component 84 extends through the through hole 813 to the internal cavity 815 of the driving arc block 81, and the other end extends through the fitting arc plate 82, and is used to adsorb the magnetic steel at the extended end of the extrusion component 84.

[0066] As a preferred embodiment, a limit block 812 is provided on the side of the driving arc block 81 for limiting the sliding distance of the adjustment sleeve 64. Specifically, during the installation of the magnetic steel, the adjustment rod 63 gradually shrinks and sticks to the motor rotor 3, and the end of the adjustment rod 63 close to the fitting component 8 gradually approaches each other, and the corresponding adjustment sleeve 64 slides on the fitting component 8 and approaches each other on the same fitting component 8. The sliding range can be limited by the limit block 812. At the same time, an external interface 811 for an external cable is provided on the end face of the driving arc block 81. The arc length of the fitting arc plate 82 exceeds that of the driving arc block 81. Specifically, as the driving arc block 81 approaches, the end faces of the fitting arc plate 82 can overlap, and a gap is maintained between the driving arc blocks 81 to avoid interference at the external interface 811.

[0067] In this embodiment, Figure 6 , the extrusion assembly 84 comprises:

[0068] The limiting rod 841 can slide radially in the cavity 815;

[0069] The adsorption plate 842 is fixed to the end of the limiting rod 841 , and a pressure spring 843 is provided between the adsorption plate 842 and the fitting arc plate 82 .

[0070] As a preferred embodiment, the metal material of the limit rod 841 can be connected to an external cable through the external interface 811 to attach a strong magnet, and the auxiliary adsorption plate 842 can adsorb and fix the magnet. Specifically, after the magnet is attached to the motor rotor 3, the arc plate 82 drives the arc block 81 to not fully reach the maximum stroke, which can effectively prevent the magnet from being damaged.

[0071] A method for installing a magnetic steel for a large synchronous motor comprises the following steps:

[0072] S1. The motor rotor 3 is sleeved on the middle position of the fixing rod 1, and the motor rotor 3 is fixed by the fixing nut 2;

[0073] S2. The guide sleeve 4, the support sleeve rod 5, the drive assembly 7 is fixed to both ends of the fixed rod 1, and the adjustment block 61 and the adjustment ring 62 are pre-installed on the guide sleeve 4;

[0074] S3. The adjusting rod 63 and the adjusting sleeve 64 are hingedly installed first, and the adjusting sleeve 64 is sleeved on the fitting assembly 8, and then the other end of the adjusting rod 63 is hinged on the adjusting ring 62;

[0075] S4. Adjust the relative rotation angles of the adjusting ring 62 and the adjusting block 61 so that the center of the fitting assembly 8 faces the fitting surface of the motor rotor 3;

[0076] S5. The magnetic steel is adsorbed on the adsorption plate 842, and a strong magnet is added to the limit rod 841 to enhance the adsorption stability;

[0077] S6. Start the drive motor to control the screw 72 to rotate, and the drive block 74 transmits the drive, so that the adjustment block 61 and the adjustment ring 62 slide synchronously in a manner of moving away from each other, and the drive arc block 81 is driven by the adjustment rod 63 and the adjustment sleeve 64 to approach the center, and then the magnetic steel is attached to the surface of the motor rotor 3 until the end of the bonding arc plate 82 is attached, and the magnetic steel installation is completed;

[0078] S7. Add a magnetic force opposite to the magnet to the limit rod 841, so that the adsorption plate 842 is separated from the magnet, adjust the drive motor to reverse, and then readjust the relative position of the adjustment ring 62 and the adjustment block 61, and re-fix the magnet on the adsorption plate 842, and repeat the magnet installation.

[0079] What is described above is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A magnetic steel mounting device for a large synchronous motor, characterized in that: include: A fixing rod (1) having a threaded outer surface, the fixing rod (1) passing through the motor rotor (3), and two fixing nuts (2) for fixing two ends of the motor rotor (3) are threadedly connected to the fixing rod (1); A guide sleeve (4) and a support sleeve rod (5) are coaxially fixed at both ends of the fixed rod (1), and the fixed rod (1), the guide sleeve (4) and the support sleeve rod (5) are fixed in sequence, wherein the guide sleeve (4) and the fixed rod (1) are detachably fixed; An adjustment assembly (6) slidably connected to the two guide sleeves (4); A driving assembly (7) is coaxially arranged inside the guide sleeve (4) and the supporting sleeve rod (5); A fitting component (8), arranged in plurality and disposed on the adjusting component (6); The regulating component (6) comprises: The adjusting blocks (61) are provided in two pieces and are respectively slidably sleeved on the two guide sleeves (4); an adjusting ring (62) is fixed on one end of the adjusting block (61), wherein the adjusting ring (62) is located on a side of the adjusting block (61) close to the motor rotor (3); An adjusting rod (63) has one end hinged on the adjusting ring (62), the adjusting rods (63) are evenly distributed on the adjusting ring (62) around the circumference, and the other ends of two adjusting rods (63) symmetrical with respect to the motor rotor (3) are hinged with an adjusting sleeve (64); The fitting assembly (8) comprises: A plurality of driving arc blocks (81) are arranged and sleeved in the adjustment sleeve (64); the driving arc blocks (81) are distributed around the motor rotor (3); a through hole (813) and a fixing hole (814) are provided inside the driving arc block (81); and a cavity (815) is provided inside the driving arc block (81); A fitting arc plate (82) is located inside the driving arc block (81), and the fitting arc plate (82) is fixed to the driving arc block (81) at the fixing hole (814) through a fixing nail (83); An extrusion component (84), one end of which extends through the through hole (813) into the inner cavity (815) of the driving arc block (81), and the other end of which extends out through the fitting arc plate (82), and is used to absorb the magnetic steel at the extended end of the extrusion component (84); The extrusion assembly (84) comprises: A limiting rod (841) is capable of sliding in a radial direction within the cavity (815); The adsorption plate (842) is fixed to the end of the limiting rod (841), and a pressure spring (843) is provided between the adsorption plate (842) and the fitting arc plate (82).

2. A magnetic steel mounting device for a large synchronous motor according to claim 1, characterized in that: The adjustment block (61) and the adjustment ring (62) are fixed by buckles, and the relative rotation angle can be adjusted.

3. The magnetic steel mounting device for a large synchronous motor according to claim 1, characterized in that: The drive assembly (7) comprises: A fixed sleeve (71) is interference-fittedly arranged inside the supporting sleeve rod (5); The screw rod (72) is rotatably arranged in the fixing sleeve (71), and a bearing (73) is arranged between the fixing sleeve (71) and the screw rod (72).

4. The magnetic steel mounting device for a large synchronous motor according to claim 3, characterized in that: One end of the screw rod (72) away from the motor rotor (3) is connected to a driving motor as a driving element. The two screw rods (72) located at the two ends of the motor rotor (3) have different rotation directions. The fixed sleeve (71) and the guide sleeve (4) are both provided with a plurality of limiting notches (711). A driving block (74) is arranged in the limiting notches (711). One end of the driving block (74) is provided with a thread to cooperate with the screw rod (72) for transmission, and the other end is fixedly connected to the adjustment block (61).

5. The magnetic steel mounting device for a large synchronous motor according to claim 4, characterized in that: A limit block (812) for limiting the sliding distance of the adjustment sleeve (64) is arranged on the side of the driving arc block (81), and an external interface (811) for connecting an external cable is provided on the end surface of the driving arc block (81), and the arc length of the fitting arc plate (82) exceeds that of the driving arc block (81).

6. The magnetic steel mounting device for a large synchronous motor according to claim 5, characterized in that: The metal material of the limit rod (841) can be connected to an external cable through the external interface (811) to attach a strong magnet, and the auxiliary adsorption plate (842) adsorbs and fixes the magnetic steel.

7. The installation method of a magnetic steel installation device for a large synchronous motor according to any one of claims 4 to 6, characterized in that: The steps include: S1. The motor rotor (3) is sleeved on the middle position of the fixing rod (1), and the motor rotor (3) is fixed by a fixing nut (2); S2. The guide sleeve (4), the support sleeve rod (5), and the drive assembly (7) are fixed to both ends of the fixed rod (1), and the adjustment block (61) and the adjustment ring (62) are pre-installed on the guide sleeve (4); S3. The adjusting rod (63) and the adjusting sleeve (64) are first hingedly installed, and the adjusting sleeve (64) is sleeved on the fitting assembly (8), and then the other end of the adjusting rod (63) is hinged on the adjusting ring (62); S4. adjusting the relative rotation angles of the adjusting ring (62) and the adjusting block (61) so that the center of the fitting assembly (8) faces the fitting surface of the motor rotor (3); S5. The magnetic steel is adsorbed on the adsorption plate (842), and a strong magnet is added to the limit rod (841) to enhance the adsorption stability; S6. Start the drive motor to control the screw (72) to rotate, and transmit the drive block (74) so ​​that the adjustment block (61) and the adjustment ring (62) slide synchronously in a manner of moving away from each other, and drive the arc block (81) to approach the center under the drive of the adjustment rod (63) and the adjustment sleeve (64), and then the magnetic steel is attached to the surface of the motor rotor (3) until the end of the attached arc plate (82) is attached, and the installation of the magnetic steel is completed; S7. Add a magnetic force opposite to the magnet to the limit rod (841) so that the adsorption plate (842) is separated from the magnet, adjust the drive motor to reverse, and then readjust the relative position of the adjustment ring (62) and the adjustment block (61), and re-fix the magnet on the adsorption plate (842), and repeat the magnet installation.

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