Magnetic steel sticking device

Abstract

The utility model discloses a kind of magnetic steel pasting equipment, for installing multiple magnetic steel on the inner circumferential wall of rotor shell, the inner circumferential wall is coated with glue, the magnetic steel pasting equipment includes: for supporting the positioning seat of the rotor shell, and the positioning seat has cavity inside;Multiple circumferential arrangement is set on the positioning seat and with multiple the piston of the one-to-one correspondence of the magnetic steel, the piston can move along the direction perpendicular to the inner circumferential wall, and the outer end of the piston is magnetically adsorbed with the magnetic steel;With the cavity communication gas source, for the cavity inflation, to realize the piston's extension, until the magnetic steel abuts the inner circumferential wall of the rotor shell;With the cavity communication vacuum generator, for the cavity air extraction, to realize the piston's recovery;Heating device is configured as heating the glue coated on the inner circumferential wall.The utility model can simultaneously bond multiple magnetic steel in small space.

Description

Technical Field

[0001] This utility model relates to the field of motor assembly, and in particular to a magnet bonding device. Background Technology

[0002] Permanent magnet motors are a common type of motor, widely used due to their high performance. An external rotor motor is a type of permanent magnet motor. The rotor components are fixed to the shaft by a rotor bracket and drive the shaft to rotate, while the stator components are locked to the housing. The rotor components include the rotor housing and multiple magnets. During manufacturing, multiple magnets need to be glued to the inner circumferential wall of the rotor housing.

[0003] In existing technologies, one method of magnet bonding involves applying adhesive to the inner circumferential wall of the outer rotor housing, clamping the magnet, and pushing it in along the axial direction of the outer rotor housing to bond it to the inner side of the outer rotor housing, thus achieving automated processing. However, due to tolerances in the magnets, there are slight differences in the thickness of each magnet. This causes thicker magnets to easily scrape off some of the adhesive from the inner circumferential wall of the outer rotor housing, resulting in uneven adhesive distribution. Consequently, the adhesion between the magnet and the inner circumferential wall of the outer rotor housing does not meet requirements, affecting production quality.

[0004] Another method of magnet bonding involves using a drive assembly to push the magnet so that it fits against the outer rotor housing. However, multiple magnets need to be bonded, which requires multiple drive assemblies for the bonding mechanism, making the overall structure complex and unable to be reduced in size, thus making it unsuitable for the current demand for miniaturization of motors. Utility Model Content

[0005] To address the shortcomings of existing technologies, this invention provides a magnet bonding device that can bond multiple magnets simultaneously in a small space.

[0006] This utility model is achieved through the following technical solution:

[0007] A magnet bonding device is used to install multiple magnets onto the inner peripheral wall of a rotor housing, wherein the inner peripheral wall is coated with adhesive. The magnet bonding device includes:

[0008] A positioning seat is configured to support the rotor housing, and the positioning seat has a cavity therein;

[0009] Multiple pistons are arranged circumferentially on the positioning seat and are corresponding one-to-one with multiple magnets. The pistons can move along a direction perpendicular to the inner peripheral wall, and the outer ends of the pistons are magnetically attracted to the magnets.

[0010] An air source, which is connected to the cavity, is configured to inflate the cavity to extend the piston until the magnet abuts against the inner peripheral wall of the rotor housing;

[0011] A vacuum generator, which is connected to the cavity and configured to evacuate the cavity to achieve the retraction of the piston;

[0012] A heating device is configured to heat the adhesive coated on the inner peripheral wall.

[0013] Furthermore, the positioning seat has multiple through holes, which are arranged perpendicular to the inner peripheral wall, and the multiple pistons are movably disposed in the multiple through holes in a one-to-one correspondence.

[0014] Furthermore, a limiting block is formed on the piston, and the limiting block is configured to limit the ultimate displacement when the piston extends.

[0015] Furthermore, a groove is formed on the outer end of the piston, and a magnet is disposed in the groove for magnetically attracting the magnet.

[0016] Furthermore, the positioning seat has multiple positioning grooves, and the multiple pistons are arranged in a one-to-one correspondence with the multiple positioning grooves. The shape of the positioning groove is adapted to the shape of the magnet for accommodating the magnet.

[0017] Furthermore, a boss is formed on the positioning seat, and the boss abuts against the bottom of the magnet.

[0018] Furthermore, a positioning post is formed on the positioning seat, and the positioning post mates with the positioning hole on the rotor housing to support the rotor housing.

[0019] Furthermore, the positioning seat includes an end cap, a cylinder, and a base arranged sequentially. The end cap is fixedly connected to the base, and the cylinder is press-fitted onto the base through the end cap.

[0020] Furthermore, the positioning seat includes a first seal, one side of which abuts against the end cap and the other side of which abuts against the cylinder body.

[0021] Furthermore, the positioning seat includes a second seal, one side of which abuts against the base and the other side of which abuts against the cylinder.

[0022] Furthermore, the positioning seat includes a third seal, one side of which abuts against the end cap and the other side of which abuts against the base.

[0023] Furthermore, the positioning seat includes a plurality of fourth seals, which are fitted one-to-one on the plurality of pistons and abut against the sidewall forming the through hole.

[0024] Furthermore, the magnetic steel bonding device also includes a solenoid valve and an air connector. The air connector is disposed on the positioning seat and communicates with the cavity. The solenoid valve has a first interface, a second interface, and a working interface. The air connector is connected to the working interface. The air source and the vacuum generator are respectively connected to the first interface and the second interface.

[0025] Furthermore, the heating device includes a driving member and a heating coil. The driving member is configured to drive the heating coil to move in a vertical direction. During heating, the heating coil is distributed around the outer periphery of the rotor housing.

[0026] Compared with existing technologies, the advantages of this utility model are:

[0027] 1. This application utilizes the operating principle of a cylinder and employs a pneumatic mechanism to simultaneously push and tighten magnets within a small space, thereby achieving the function of pressing and bonding multiple magnets at once, which greatly improves production efficiency.

[0028] 2. In this application, multiple pistons can move independently, which avoids the influence caused by different thickness tolerances of the magnets and improves the accuracy of bonding.

[0029] 3. This application also includes a heating device using a high-frequency heating coil to heat the rotor housing, which greatly improves the curing efficiency of the adhesive, thereby increasing production efficiency and enabling mass production.

[0030] 4. This application uses a fluororubber seal, which avoids the influence of high temperature environment and glue on the seal, and improves the sealing effect of the cavity and the stability of the pneumatic mechanism.

[0031] 5. This application detachably mounts the adhesive applicator on the support frame, allowing one operator to operate two sets of adhesive applicators simultaneously. While one applicator is loading material and the heating device is working to cure it, the operator can load material onto the other applicator. Alternating use of the two sets of adhesive applicators effectively improves work efficiency and production capacity. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the structure of a magnet bonding device according to an embodiment of the present invention;

[0033] Figure 2 This is a partial structural diagram of the adhesive device and rotor according to an embodiment of the present invention;

[0034] Figure 3This is an exploded view of an adhesive device according to an embodiment of the present invention;

[0035] Figure 4 This is a longitudinal sectional view of an adhesive device according to an embodiment of the present invention;

[0036] Figure 5 This is a radial sectional view of an adhesive device according to an embodiment of the present invention;

[0037] Figure 6 This is a schematic diagram of the air circuit connection according to an embodiment of the present invention.

[0038] Labeling Explanation: 1. Control Cabinet; 10. Start Button; 11. Display Screen; 2. Support Frame; 20. Snap-fit ​​Block; 3. Adhesive Device; 30. Positioning Seat; 300. Cavity; 30a. Inner Wall; 301. Positioning Groove; 30b. Protruding Wall; 302. Boss; 303. Positioning Column; 304. End Cap; 304a. Connecting Column; 305. Cylinder; 306. Base; 306a. Channel; 307. Through Hole; 308. Snap-fit ​​Block; 31. Piston; 310. Limit Block 311. Outer end; 312. Groove; 313. Inner end; 314. Receiving groove; 32. Air connector; 4. Heating device; 41. Driving component; 42. Heating coil; 5. Air source; 50. Air source processor; 6. Vacuum generator; 7. Solenoid valve; 80. Rotor housing; 800. Inner peripheral wall; 801. Positioning hole; 81. Magnet; 810. Bottom; 91. First seal; 92. Second seal; 93. Third seal; 94. Fourth seal. Detailed Implementation

[0039] The following detailed, non-limiting description of the utility model's technical solution, in conjunction with preferred embodiments and accompanying drawings, is provided. In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0040] like Figures 1 to 6 As shown, an embodiment of this utility model provides a magnet bonding device for mounting multiple magnets 81 onto the inner peripheral wall 800 of a rotor housing 80. Specifically, the inner peripheral wall 800 of the rotor housing 80 is coated with adhesive. The magnet bonding device provided in this application can bond multiple magnets 81 to the inner peripheral wall 800 and heat the rotor housing 80 to rapidly cure the adhesive, thereby improving production efficiency.

[0041] In this embodiment, the magnet bonding equipment mainly includes a control cabinet 1, a support frame 2, a bonding device 3, and a heating device 4. The control cabinet 1 is equipped with a control system and a start button 10 for controlling the operation of the bonding device 3 and the heating device 4. The control cabinet 1 also has a display screen 11 to display and set operating information, such as the heating temperature and heating time of the heating device 4. The support frame 2 is used to elevate the bonding device 3 and the heating device 4 for easy material placement. The bonding device 3 is used to bond multiple magnets 81 to the inner peripheral wall 800 of the rotor housing 80. The heating device 4 then heats the rotor housing 80, thereby heating the adhesive coated on the inner peripheral wall 800 to accelerate adhesive curing and improve the bonding efficiency of the magnets 81.

[0042] For details, please refer to Figures 2 to 4 The bonding device 3 includes a positioning seat 30 and a plurality of pistons 31 disposed on the positioning seat 30. The positioning seat 30 supports the rotor housing 80 and has a cavity 300 inside. The plurality of pistons 31 are arranged circumferentially on the positioning seat 30 and are correspondingly arranged with a plurality of magnets 81. In addition, when a pressure difference is generated between the cavity 300 and the outside, the pistons 31 can move in a direction perpendicular to the inner peripheral wall 800 under the action of air pressure (this direction is also the bonding direction of the magnets 81), and the outer end 311 of the piston 31 is magnetically attracted to the magnets 81. That is, when the piston 31 moves, it can drive the corresponding magnets 81 to move, so that the magnets 81 can be bonded to the inner peripheral wall 800 to ensure the stability of the bonding between the magnets 81 and the inner peripheral wall 800.

[0043] Important reference Figure 6The magnet bonding device includes an air source 5 and a vacuum generator 6. Both the air source 5 and the vacuum generator 6 are connected to the cavity 300. The air source 5 can fill the cavity 300 with air, so that the air pressure inside the cavity 300 increases to a level greater than the external air pressure. At this time, the piston 31 extends outward from the positioning seat 30 under the action of the pressure difference, completing the process of bonding the magnet 81 to the inner peripheral wall 800 of the rotor housing 80. Preferably, the gas supplied by the air source 5 needs to be processed by the air source processor 50 to avoid impurities from entering and affecting the operation of the equipment. The vacuum generator 6 can evacuate the cavity 300 to reduce the air pressure inside the cavity 300. At this time, the piston 31 retracts into the positioning seat 30 under the action of the pressure difference. This process allows the piston 31 to return to its original position after the magnet 81 has completed the bonding process, in preparation for the next extension. At the same time, since multiple pistons 31 share one cavity 300, the synchronous operation of multiple pistons 31 can be achieved. Meanwhile, since multiple pistons 31 extend or retract under the action of pressure difference, the situation of setting multiple driving components is avoided. This application enables multiple pistons 31 to push and tighten magnets 81 simultaneously in a small space, realizing the function of pushing and bonding multiple magnets 81 at one time. In this embodiment, there are specifically 8 magnets 81, which greatly improves production efficiency.

[0044] Furthermore, focus on reference Figures 3 to 5 The positioning seat 30 has multiple independent through holes 307. These through holes 307 are perpendicular to the inner peripheral wall 800 and connect the cavity 300 to the outside. Furthermore, the multiple through holes 307 are evenly arranged around the circumference of the positioning seat 30 on the same radial plane. Multiple pistons 31 are correspondingly and movably disposed within the multiple through holes 307, allowing the pistons 31 to be evenly arranged around the circumference of the positioning seat 30. This improves the stability and uniformity of the force on the multiple magnets 81, enhancing the bonding effect. Moreover, the independence of the multiple through holes 307 also ensures that the movement of the multiple pistons 31 is independent; each piston 31 can push its corresponding magnet 81 tightly against the inner peripheral wall 800, resolving the influence of thickness tolerances on the multiple magnets 81 and ensuring that each magnet 81 is firmly bonded.

[0045] Furthermore, the positioning seat 30 includes multiple fourth seals 94, which are correspondingly fitted onto multiple pistons 31 and abut against the sidewall forming the through hole 307 to prevent gas leakage from the cavity 300 through the through hole 307, thus ensuring the stability of the equipment operation. To prevent the fourth seals 94 from dislodging, an annular receiving groove 314 is formed on the piston 31, within which the fourth seals 94 are accommodated.

[0046] Meanwhile, to prevent the piston 31 from dislodging from the positioning seat 30 when it extends outward, a limiting block 310 is formed on the piston 31. The limiting block 310 protrudes from the inner end 313 of the piston 31 and is disposed within the cavity 300. When the piston 31 extends outward to its limit position, the limiting block 310 abuts against the inner wall 30a of the cavity 300, thereby preventing the piston 31 from dislodging.

[0047] Furthermore, a groove 312 is formed on the outer end 311 of the piston 31, and a magnet is provided in the groove 312 to attract the corresponding magnet 81, ensuring that the position of the magnet 81 remains unchanged when the magnet 81 is pushed, and the meshing process is more stable.

[0048] Furthermore, the positioning seat 30 has multiple positioning grooves 301 formed thereon, and multiple pistons 31 are arranged one-to-one with the multiple positioning grooves 301. The shape of the positioning grooves 301 is adapted to the shape of the magnet 81 to accommodate the magnet 81. Specifically, the magnet 81 and the positioning grooves 301 are in clearance fit, that is, the two sides of the magnet 81 are guided and limited by the convex walls 30b forming the positioning grooves 301 to ensure the accuracy of the installation position of the magnet 81 in the circumferential direction.

[0049] Furthermore, a boss 302 is formed on the positioning seat 30, which abuts against the bottom 810 of the magnet 81 to ensure the accuracy of the installation position of the magnet 81 in the vertical direction (axial direction). This application, through the cooperation of the positioning groove 301 and the boss 302, can ensure the accuracy of the installation position of the magnet 81 at the corresponding position. It is worth noting that the reference position of multiple magnets 81 in the vertical direction is uniform, and if there is any tilting in the circumferential direction, it will be corrected by the convex wall 30b forming the positioning groove 301, thereby making the relative position between all magnets 81 more accurate and the overall installation error extremely small.

[0050] Preferably, a positioning post 303 is formed on the positioning seat 30, and the positioning post 303 mates with the positioning hole 801 on the rotor housing 80 to ensure that multiple magnets 81 can be evenly adhered to the inner peripheral wall 800 of the rotor housing 80 during bonding. In this embodiment, the positioning post 303 is formed at the center of the positioning seat 30, and the positioning hole 801 on the rotor housing 80 is also located at the center of the rotor housing 80. Therefore, when the positioning post 303 mates with the positioning hole 801, it can ensure that the axis of the inner peripheral wall 800 of the rotor housing 80 coincides with the axis of the positioning seat 30, so as to ensure accurate positioning of multiple magnets 81 during bonding. Preferably, the above-mentioned mating can be that the rotor housing 80 is sleeved on the positioning post 303.

[0051] It is understood that multiple positioning posts 303 can also be provided in other alternative embodiments, and their positions can be set arbitrarily, as long as it is ensured that after the rotor housing 80 is mated with the positioning post 303, the axis of the inner peripheral wall 800 of the rotor housing 80 coincides with the axis of the positioning seat 30.

[0052] Optional, please refer to. Figures 3 to 5 The positioning seat 30 includes an end cap 304, a cylinder body 305, and a base 306 arranged sequentially. The end cap 304 is fixedly connected to the base 306, and the cylinder body 305 is press-fitted onto the base 306 via the end cap 304. Specifically, a connecting post 304a is formed on the end cap 304, which abuts against the base 306 and is fixed with bolts. The cylinder body 305 is sleeved outside the connecting post 304a and snapped between the end cap 304 and the base 306, thereby achieving the fixation of the three components. The cavity 300 is defined by the end cap 304, the cylinder body 305, and the base 306. Meanwhile, the positioning groove 301 and the through hole 307 are both formed on the cylinder body 305, preferably on the outer side wall, and the boss 302 is formed on the base 306. This arrangement makes the machining and forming of the positioning seat 30 more convenient and facilitates the installation of the piston 31.

[0053] In addition, refer to Figure 5 When the piston 31 retracts inward, the inner end 313 of the piston 31 will abut against the connecting post 304a to prevent the piston 31 from falling into the cavity 300.

[0054] Since the cavity 300 needs to create a pressure difference with the outside environment to drive the piston 31, the sealing of the cavity 300 is particularly important. In this embodiment, the positioning seat 30 also includes a first sealing element 91, a second sealing element 92, and a third sealing element 93. The first sealing element 91 is disposed on the end cap 304, with one side abutting against the end cap 304 and the other side abutting against the cylinder 305 to ensure a seal between the end cap 304 and the cylinder 305. The second sealing element 92 is disposed on the base 306, with one side abutting against the base 306 and the other side abutting against the cylinder 305 to ensure a seal between the base 306 and the cylinder 305. The third sealing element 93 is sleeved on the connecting post 304a, with one side abutting against the connecting post 304a and the other side abutting against the base 306 to ensure a seal between the end cap 304 and the base 306. This application ensures the sealing performance of the cavity 300 through the first seal 91, the second seal 92, the third seal 93, and the aforementioned fourth seal 94, thereby ensuring the rapid and stable movement of the piston 31 and improving the stability of the equipment.

[0055] Further reference Figure 6The magnetic steel bonding device also includes a solenoid valve 7 and an air connector 32. The air connector 32 is mounted on the positioning seat 30 and communicates with the cavity 300. Specifically, a channel 306a is formed on the base 306, one end of which communicates with the cavity 300, and the other end communicates with the air connector 32. The solenoid valve 7 is a two-position three-way solenoid valve, having a first interface, a second interface, and a working interface. The air connector 32 is connected to the working interface, and the air source 5 and vacuum generator 6 are connected to the first interface and the second interface, respectively. When the piston 31 needs to extend, the gas supplied by the air source 5 enters the cavity 300 through the solenoid valve 7 and the air connector 32. When the piston 31 needs to retract, the working mode of the solenoid valve 7 switches, the vacuum generator 6 operates, and the gas in the cavity 300 is extracted through the air connector 32 and the solenoid valve 7. This application uses the solenoid valve 7 to control the flow of gas in the cavity 300, which has the advantages of safety, reliability, system simplicity, and fast response.

[0056] Furthermore, since the heating device 4 needs to heat the rotor housing 80 to accelerate the curing of the adhesive, the positioning seat 30 will also be affected by the temperature. Therefore, in this embodiment, the first seal 91, the second seal 92, the third seal 93, and the fourth seal 94 are all made of fluororubber to ensure the sealing effect of the seals under high temperature and high frequency friction.

[0057] Furthermore, we will focus on referring to Figure 1 The heating device 4 includes a driving member 41 and a heating coil 42. The driving member 41 can drive the heating coil 42 to move vertically. In this embodiment, the driving member 41 is a cylinder and is fixed on the support frame 2. The heating coil 42 is fixed on the output end of the driving member 41, thereby enabling the driving member 41 to drive the heating coil 42 to move between the standby position and the heating position. During heating, the heating coil 42 is distributed around the outer periphery of the rotor housing 80. During standby, the heating coil 42 does not obstruct the placement or removal of the rotor housing 80, facilitating loading and unloading.

[0058] Preferably, the heating coil 42 is a high-frequency heating coil, which can quickly raise the rotor housing 80 to the set temperature to improve the curing speed of the adhesive and improve the bonding efficiency of the magnet 81.

[0059] The working process of the magnet bonding device provided in this embodiment is as follows:

[0060] First, eight magnets 81 are placed manually or by a robotic arm into eight positioning slots 301, ensuring that the magnets 81 are attracted by the magnets on the pistons 31 at their corresponding positions, and that the bottom 810 of the magnets 81 abuts against the bosses 302, with the sides of the magnets 81 being limited. Next, after applying adhesive to the inner circumferential wall 800 of the rotor housing 80, the rotor housing 80 is placed on the positioning seat 30, with the positioning hole 801 engaging with the positioning post 303, preferably with both axially collinear. Then, the control button 10 is activated, and the gas supplied by the air source 5, after being processed by the air source processor 50, sequentially passes through the solenoid valve 7, the air connector 32, and the channel 306a into the cavity 300, thereby pushing the eight pistons 31 to extend synchronously, pressing the eight magnets 81 tightly against the inner circumferential wall 800. Next, the driving component 41 drives the heating coil 42 downward to move around the rotor housing 80 and heat the rotor housing 80. In this embodiment, the heating temperature is set between 150°C and 180°C for 30 seconds to allow the adhesive to cure quickly. After heating, the driving component 41 drives the heating coil 42 upward to facilitate the removal of the rotor housing 80, completing one bonding operation.

[0061] In another alternative embodiment, emphasis is placed on... Figure 3 and Figure 5 A locking block 308 is fixed on the base 306, and a pair of locking blocks 20 are provided on the support frame 2. The cross-section of the locking blocks 20 is L-shaped, thus forming a locking groove between the pair of locking blocks 20 and the support frame 2. The locking blocks 308 are detachably locked in the locking groove, so that the entire bonding device 3 is detachably mounted on the support frame 2. This arrangement allows one person to operate two bonding devices 3. That is, after the rotor housing 80 and magnet 81 are placed on one bonding device 3, the bonding device 3 is locked in the locking groove, and the heating device 4 heats and cures it. During the heating and curing process, the operator can continue to place magnet 81 and rotor housing 80 on the other bonding device 3. The two bonding devices 3 are used alternately, which greatly improves production efficiency and capacity.

[0062] This application utilizes the operating principle of a cylinder and employs a starting mechanism to simultaneously push and tighten multiple magnets 81 within a small space, achieving the function of sequentially bonding and tightening multiple magnets 81, greatly improving production efficiency. Furthermore, each piston 31 can move independently, avoiding the impact of varying thickness tolerances of the magnets 81. In addition, this application incorporates a heating device 4 using a high-frequency heating coil to heat the rotor housing 80, significantly improving the adhesive curing efficiency and enabling mass production. Simultaneously, the use of fluororubber seals for high-temperature environments avoids the influence of high temperatures and adhesives on the seals, improving the sealing effect of the cavity 300 and the stability of the pneumatic mechanism.

[0063] The above embodiments only illustrate several implementation methods of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A magnet bonding device for mounting a plurality of magnets (81) onto the inner peripheral wall (800) of a rotor housing (80), wherein the inner peripheral wall (800) is coated with adhesive, characterized in that, The magnet bonding device includes: The positioning seat (30) is configured to support the rotor housing (80), and the positioning seat (30) has a cavity (300). Multiple pistons (31) are arranged circumferentially on the positioning seat (30) and are corresponding to multiple magnets (81). The pistons (31) can move along a direction perpendicular to the inner peripheral wall (800), and the outer end (311) of the pistons (31) is magnetically attracted to the magnets (81). An air source (5) is connected to the cavity (300) and is configured to pressurize the cavity (300) to extend the piston (31) until the magnet (81) abuts against the inner peripheral wall (800) of the rotor housing (80). A vacuum generator (6) is connected to the cavity (300) and is configured to evacuate the cavity (300) to achieve the retraction of the piston (31); The heating device (4) is configured to heat the adhesive coated on the inner peripheral wall (800).

2. The magnet bonding device according to claim 1, characterized in that, The positioning seat (30) has a plurality of through holes (307) formed therein, the through holes (307) being arranged perpendicular to the inner peripheral wall (800), and the plurality of pistons (31) being movably arranged in the plurality of through holes (307) in a corresponding manner.

3. The magnet bonding device according to claim 1, characterized in that, A limiting block (310) is formed on the piston (31), and the limiting block (310) is configured to limit the ultimate displacement of the piston (31) when it extends.

4. The magnet bonding device according to claim 1, characterized in that, A groove (312) is formed on the outer end (311) of the piston (31), and a magnet is provided in the groove (312) for magnetically attracting the magnet (81).

5. The magnet bonding device according to claim 2, characterized in that, The positioning seat (30) has a plurality of positioning grooves (301), and the plurality of pistons (31) are arranged in a one-to-one correspondence with the plurality of positioning grooves (301). The shape of the positioning groove (301) is adapted to the shape of the magnet (81) for housing the magnet (81).

6. The magnet bonding device according to claim 4, characterized in that, A boss (302) is formed on the positioning seat (30), and the boss (302) abuts against the bottom (810) of the magnet (81).

7. The magnet bonding device according to claim 1, characterized in that, A positioning post (303) is formed on the positioning seat (30), and the positioning post (303) is engaged with the positioning hole (801) on the rotor housing (80) to support the rotor housing (80).

8. The magnet bonding device according to claim 4, characterized in that, The positioning seat (30) includes an end cap (304), a cylinder (305) and a base (306) arranged in sequence. The end cap (304) is fixedly connected to the base (306), and the cylinder (305) is pressed onto the base (306) through the end cap (304).

9. The magnet bonding device according to claim 8, characterized in that, The positioning seat (30) includes a first seal (91), one side of which abuts against the end cap (304) and the other side of which abuts against the cylinder (305).

10. The magnet bonding device according to claim 8, characterized in that, The positioning seat (30) includes a second seal (92), one side of which abuts against the base (306) and the other side of which abuts against the cylinder (305).

11. The magnet bonding device according to claim 8, characterized in that, The positioning seat (30) includes a third seal (93), one side of which abuts against the end cap (304) and the other side of which abuts against the base (306).

12. The magnet bonding device according to claim 8, characterized in that, The positioning seat (30) includes a plurality of fourth seals (94), which are fitted one-to-one on the plurality of pistons (31) and abut against the sidewall forming the through hole (307).

13. The magnet bonding device according to claim 1, characterized in that, The magnet bonding device also includes a solenoid valve (7) and an air connector (32). The air connector (32) is disposed on the positioning seat (30) and communicates with the cavity (300). The solenoid valve (7) has a first interface, a second interface and a working interface. The air connector (32) is connected to the working interface. The air source (5) and the vacuum generator (6) are respectively connected to the first interface and the second interface.

14. The magnet bonding device according to claim 1, characterized in that, The heating device (4) includes a driving member (41) and a heating coil (42). The driving member (41) is configured to drive the heating coil (42) to move in a vertical direction. When heating, the heating coil (42) is distributed around the outer periphery of the rotor housing (80).

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