An assembly jig for a magnetic circuit system

Abstract

The present application discloses an assembly jig for a magnetic circuit system. The assembly jig includes a first assembly jig, which includes: a first carrier, provided with a first positioning groove for simultaneously positioning a magnetic conductive plate and a first semi-finished product, and a first avoidance hole is provided at the bottom of the first positioning groove; a second carrier, provided with a second positioning groove for positioning a second semi-finished product, and the second semi-finished product includes a magnetic conductive cover and a bottom magnetic plate accommodated in a accommodating cavity and fixed to the bottom wall; wherein the first carrier is also used to align and snap with the second carrier, so that the first semi-finished product, the magnetic conductive plate and the second semi-finished product are stacked on each other, and the first fastener is allowed to pass through the first avoidance hole in sequence and fix the first semi-finished product, the magnetic conductive plate and the second semi-finished product to form a magnetic circuit system. In the above manner, the assembly jig provided by the present application can overcome the problem of difficulty in stacking and assembly due to the same polarity of the facing sides of the bottom magnetic plate and the top magnetic plate.

Description

Technical Field

[0001] The present application relates to the technical field of jigs, and in particular to an assembly jig for a magnetic circuit system. Background Art

[0002] During the development of bone conduction headphone technology, the original magnetic circuit system was optimized and a new magnetic circuit system structure was proposed. Based on the new magnetic circuit system structure, new requirements were put forward for its assembly fixture. Summary of the invention

[0003] The present application mainly provides an assembly jig for a magnetic circuit system to solve the problem that when the magnetic circuit system is assembled with magnets, the polarities of the bottom magnetic plate and the top magnetic plate facing each other are the same, making it difficult to assemble.

[0004] In order to solve the above technical problems, a technical solution adopted in the present application is: to provide an assembly jig of a magnetic circuit system. The assembly jig includes a first assembly jig, which includes: a first carrier, provided with a first positioning groove for simultaneously positioning the magnetic conductive plate and the first semi-finished product, the first semi-finished product includes a top magnetic plate and a plastic part that are stacked and fixed to each other, and a first avoidance hole of a first fastener is provided at the bottom of the first positioning groove; a second carrier, provided with a second positioning groove for positioning the second semi-finished product, the second semi-finished product includes a magnetic conductive cover and a bottom magnetic plate that is accommodated in the accommodating cavity and fixed to the bottom wall; wherein the first carrier is also used to align and snap with the second carrier, so that the first semi-finished product, the magnetic conductive plate and the second semi-finished product are stacked on each other, and the first fastener is sequentially passed through the first avoidance hole and fixed to the first semi-finished product, the magnetic conductive plate and the second semi-finished product to form a magnetic circuit system.

[0005] The beneficial effect of the present application is that, different from the prior art, the present application discloses an assembly jig for a magnetic circuit system. By setting a first carrier and a second carrier, wherein the first carrier is provided with a first positioning groove, and the second carrier is provided with a second positioning groove, the first carrier can also be aligned and snapped with the second carrier, so that the top magnetic plate located on the first carrier and the bottom magnetic plate located on the second carrier can still be stacked even if the magnetic poles of the same polarity are arranged oppositely, and further a first avoidance hole is provided at the bottom of the first positioning groove, so as to facilitate the first fastener to be inserted through the first avoidance hole to fix the magnetic circuit system. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work, among which:

[0007] Figure 1It is a schematic diagram of the cross-sectional structure of the magnetic circuit system of the present application;

[0008] Figure 2 yes Figure 1 An exploded schematic diagram of the magnetic circuit system shown;

[0009] Figure 3 It is a structural schematic diagram of an embodiment of an automatic assembly system provided by the present application;

[0010] Figure 4 It is a structural schematic diagram of an embodiment of a second assembly jig in the assembly jig of the present application;

[0011] Figure 5 yes Figure 4 A schematic diagram of a top view of the structure of the third stage in the second assembly fixture;

[0012] Figure 6 It is a structural schematic diagram of an embodiment of a third assembly jig in the assembly jig of the present application;

[0013] Figure 7 yes Figure 6 A schematic diagram of a sectional exploded structure of a third assembly fixture is shown;

[0014] Figure 8 It is a structural schematic diagram of an embodiment of a first assembly jig in the assembly jig of the present application;

[0015] Fig. 9 yes Figure 8 A schematic diagram of the structure of the first carrier and the second carrier;

[0016] Fig.10 yes Figure 8 A schematic diagram of the structure of the positioning platform in the first assembly fixture;

[0017] Fig.11 yes Figure 3 A structural schematic diagram of an embodiment of a plastic parts assembly device;

[0018] Fig.12 yes Figure 3 A schematic structural diagram of an embodiment of a medium magnetic shield assembly device;

[0019] Fig.13 yes Figure 3 A schematic structural diagram of an embodiment of a finished product assembly device;

[0020] Fig.14 yes Fig.13 A schematic diagram of the structure of the middle flip device;

[0021] Fig.15 yes Fig.13 A schematic diagram of the structure of the middle guide pressing member;

[0022] Fig.16 yes Fig.13 Schematic diagram of the structure of the middle push rod mechanism. DETAILED DESCRIPTION

[0023] See also Figure 1 to Figure 2 , Figure 1 is a schematic cross-sectional view of the magnetic circuit system of the present application, Figure 2 yes Figure 1 Schematic diagram of the exploded magnetic circuit system shown.

[0024] The magnetic circuit system 5 is an important component of the bone conduction earphone, and its function is to provide a constant magnetic field. The constant magnetic field further cooperates with the changing magnetic field generated by the voice coil in the energized state to convert the electrical signal into mechanical vibration, which is directly transmitted to the auditory nerve through the bones and human tissues, so that the user can produce an auditory response.

[0025] like Figure 1 As shown, the magnetic circuit system 5 includes a magnetic shield 51, a bottom magnetic plate 52, a magnetic shield 53, a top magnetic plate 54 and a plastic part 55. The magnetic shield 51 includes a bottom wall 512 and an annular peripheral wall 514 connected to the bottom wall 512, thereby forming a receiving cavity 516. The bottom magnetic plate 52, the magnetic shield 53, the top magnetic plate 54 and the plastic part 55 are received in the receiving cavity 516 and are sequentially stacked on the bottom wall 512, wherein the adjacent end faces of the bottom magnetic plate 52 and the top magnetic plate 54 have the same polarity.

[0026] It should be noted that the “bottom” and “top” in the bottom magnetic plate 52 and the top magnetic plate 54 are used to describe the positional relationship between the two relative to the bottom wall 512. Specifically, Figure 1 In the stacked structure shown, the bottom magnetic plate 52 is closer to the bottom wall 512 than the top magnetic plate 54 .

[0027] In the above-mentioned magnetic circuit system 5, since the bottom magnetic plate 52, the magnetic conductive plate 53, the top magnetic plate 54 and the plastic part 55 need to be stacked in a relatively small accommodating cavity 516, and the adjacent end faces of the bottom magnetic plate 52 and the top magnetic plate 54 have the same polarity, the difficulty of assembling the magnetic circuit system 5 is increased. Therefore, in the present application, the magnetic circuit system 5 is assembled in steps through various assembly jigs and assembly equipment described below to reduce the difficulty of assembly.

[0028] like Figure 2 As shown, during the assembly process of the magnetic circuit system 5, the plastic part 55 and the top magnetic plate 54 are first stacked and assembled into the first semi-finished product 550, and the bottom magnetic plate 52 and the magnetic conductive cover 51 are assembled into the second semi-finished product 510, and then the magnetic conductive plate 53 and the first semi-finished product 550 are stacked on the bottom magnetic plate 52 in sequence, and the first semi-finished product 550, the magnetic conductive plate 53 and the second semi-finished product 510 are fastened to form the magnetic circuit system 5.

[0029] Specifically, the first semi-finished product 550 includes a top magnetic plate 54 and a plastic part 55 which are stacked and fixed to each other, and the second semi-finished product 510 includes a magnetic cover 51 and a bottom magnetic plate 52 which is accommodated in the accommodating cavity 516 and fixed to the bottom wall 512 .

[0030] See also Figure 3 , Figure 3 It is a structural schematic diagram of an embodiment of an automatic assembly system provided by the present application.

[0031] The automatic assembly system 100 includes an assembly jig and automatic assembly equipment. The assembly jig includes a second assembly jig 12, a third assembly jig 14 and a first assembly jig 16. The automatic assembly equipment includes a plastic parts assembly equipment 2, a magnetic cover assembly equipment 3 and a finished product assembly equipment 4.

[0032] Among them, the plastic parts assembly equipment 2 is used to stack and fix the top magnetic plate 54 and the plastic parts 55 through the second assembly jig 12 to form a first semi-finished product 550; the magnetic cover assembly equipment 3 is used to place the bottom magnetic plate 52 into the accommodating cavity 516 and stack and fix it with the bottom wall 512 of the magnetic cover 51 through the third assembly jig 14 to form a second semi-finished product 510; the finished product assembly equipment 4 is used to stack and fix the first semi-finished product 550 and the magnetic plate 53 on the bottom magnetic plate 52 through the first assembly jig 16.

[0033] See also Figure 4 and Figure 5 The second assembly fixture 12 includes a third carrier 120 and a second magnetic member 122. The third carrier 120 is provided with a third positioning groove 1210, a fourth positioning groove 1211 and a receiving groove 1212 which are sequentially connected from the surface of the third carrier 120 to the inside. The fourth positioning groove 1211 is arranged at the bottom of the third positioning groove 1210, the receiving groove 1212 is arranged at the bottom of the fourth positioning groove 1211, and the second magnetic member 122 is arranged in the receiving groove 1212.

[0034] The third positioning groove 1210 is used to position the top magnetic plate 54 , the fourth positioning groove 1211 is used to position the plastic component 55 , and the second magnetic attraction component 122 is used to magnetically attract the top magnetic plate 54 and prevent the magnetic poles of the top magnetic plate 54 from being reversed.

[0035] When assembling the first semi-finished product 550, the plastic part 55 and the top magnetic plate 54 are sequentially arranged in the fourth positioning groove 1211 and the third positioning groove 1210, and the top magnetic plate 54 arranged in the third positioning groove 1210 is stacked and bonded to the plastic part 55 to form the first semi-finished product 550. In other embodiments, the plastic part 55 and the top magnetic plate 54 can be fixed by hot melting or other fixing methods.

[0036] The third carrier 120 is made of a non-magnetic material, which is neither magnetic nor magnetizable, for example, the third carrier 120 is made of stainless steel or copper, etc. The edge of the opening end of the third positioning groove 1210 may also be chamfered to facilitate the assembly of the top magnetic plate 54.

[0037] The bottom of the third positioning groove 1210 is also provided with a first vent hole 1213, and the bottom of the fourth positioning groove 1211 is provided with a second vent hole 1214. The aperture of the first vent hole 1213 is larger than the aperture of the second vent hole 1214, so as to avoid the local positive pressure that may be formed when the plastic part 55 and the top magnetic plate 54 are assembled with the corresponding positioning groove, and avoid the positioning effect being adversely affected by the local positive pressure, thereby ensuring that the plastic part 55 and the top magnetic plate 54 are stacked and assembled through the third carrier 120. Further, the first vent hole 1213 and the second vent hole 1214 can also be connected to the corresponding negative pressure device, thereby providing negative pressure in the corresponding positioning groove to accelerate the positioning process of the plastic part 55 and the top magnetic plate 54.

[0038] The receiving groove 1212 includes a first cavity 1216 and two second cavities 1217 disposed on both sides of the first cavity 1216 . The first cavity 1216 and the two second cavities 1217 are connected. The first cavity 1216 receives the second magnetic member 122 . The second cavity 1217 is used to avoid the plastic member 55 .

[0039] A positioning portion 1215 is provided on the side of the third carrier 120, and the positioning portion 1215 is used to coordinately position the third carrier 120 on the plastic component assembly device 2. The positioning portion 1215 can be a positioning groove, a positioning hole, or the like.

[0040] See also Figure 6 and Figure 7 The third assembly fixture 14 includes a fourth carrier 140 and a fifth carrier 142. The fourth carrier 140 is provided with a fifth positioning groove 1402 for positioning the annular circumferential wall 514 of the magnetic cover 51; the fifth carrier 142 is provided with a guide channel 1422. The fifth carrier 142 is assembled with the fourth carrier 140, and then the fifth carrier 142 is inserted into the accommodating cavity 516 of the magnetic cover 51 located in the fifth positioning groove 1402, so that the guide channel 1422 locates an assembly area on the bottom wall 512 that is assembled with the bottom magnetic plate 52. The bottom magnetic plate 52 is placed in the accommodating cavity 516 via the guide channel 1422, and then can be assembled and fixed with the assembly area on the bottom wall 512, and is spaced from the annular circumferential wall 514.

[0041] The bottom magnetic plate 52 is aligned with the assembly area through the guide channel 1422, and the bottom magnetic plate 52 is fixed to the bottom wall 512, so that the magnetic cover 51 and the bottom magnetic plate 52 are stacked and fixed to form the second semi-finished product 510. The bottom magnetic plate 52 and the bottom wall 512 can also be fixed by adhesive or other fixing methods.

[0042] Specifically, the fourth carrier 140 is first used to locate the assembly area on the bottom wall 512, and then the bottom magnetic plate 52 is superimposed on the assembly area to achieve stacking and fixing of the bottom magnetic plate 52 and the bottom wall 512 at a specific position to form a required gap between the bottom magnetic plate 52 and the annular circumferential wall 514, thereby effectively improving the assembly accuracy of the magnetic cover 51 and the bottom magnetic plate 52 and reducing the difficulty of assembly.

[0043] Optionally, the fifth carrier 142 can be a sleeve structure, whose outer wall is fitted against the inner side of the annular circumferential wall 514, and whose wall thickness is set according to the required gap width between the bottom magnetic plate 52 and the annular circumferential wall 514 to occupy the non-assembly area within the accommodating cavity 516, so that the guide channel 1422 and the bottom wall 512 are positioned out of the assembly area, and then the bottom magnetic plate 52 is guided and limited along the guide channel 1422 and is set in the assembly area.

[0044] In this embodiment, the fifth carrier 142 includes a first sleeve 1421 and a second sleeve 1423 arranged on one side of the first sleeve 1421, the guide channel 1422 passes through the first sleeve 1421 and the second sleeve 1423, the second sleeve 1423 is inserted into the accommodating cavity 516, and the first sleeve 1421 is superimposed on the fourth carrier 140 and assembled in alignment with the fourth carrier 140.

[0045] By using the fifth positioning groove 1402 to position the annular circumferential wall 514 and using the first sleeve 1421 to align and assemble with the fourth carrier 140, it is possible to avoid excessive friction or collision between the second sleeve 1423 and the inner side of the annular circumferential wall 514 due to alignment deviation during the insertion of the second sleeve 1423 into the accommodating cavity 516, which is beneficial to reducing damage to the magnetic cover 51 and improving positioning accuracy.

[0046] The height of the second sleeve 1423 along the extending direction of the guide channel 1422 is smaller than the depth of the accommodating cavity 516 in the extending direction to prevent the second sleeve 1423 from abutting against the bottom wall 512 and causing deformation of the bottom wall 512 .

[0047] The fourth carrier 140 is further provided with an alignment post 144, and the first sleeve 1421 is provided with an alignment hole 1424, so that when the first sleeve 1421 and the fourth carrier 140 are aligned and assembled, the alignment post 144 is correspondingly penetrated into the alignment hole 1424, so that the fourth carrier 140 and the fifth carrier 142 are aligned and assembled through the alignment post 144 and the alignment hole 1424. In other embodiments, the fourth carrier 140 may be provided with an alignment hole, and the first sleeve 1421 may be provided with an alignment post.

[0048] In this embodiment, the magnetic cover 51 is provided with a first through hole 511, the bottom magnetic plate 52 is provided with a second through hole 520, and the bottom of the fifth positioning groove 1402 is provided with an avoidance hole 1406 corresponding to the first through hole 511 and the second through hole 520. The first through hole 511 and the second through hole 520 can be used for fasteners to pass through during the subsequent assembly of the finished product.

[0049] The bottom of the fifth positioning groove 1402 is provided with an avoidance hole 1406 to avoid that when the bottom magnetic plate 52 is bonded to the bottom wall 512 by gluing, the adhesive used for bonding has a high probability of covering the first through hole 511 and the second through hole 520, and prevents the adhesive from solidifying and blocking the first through hole 511 and the second through hole 520, so that the magnetic circuit system 5 cannot be fixed by fasteners when it is subsequently assembled. At the same time, if the adhesive solidifies and blocks, the first through hole 511 and the second through hole 520 can be dredged by using a rod through the avoidance hole 1406.

[0050] A vent hole 1407 is further provided at the bottom of the fifth positioning groove 1402 to prevent the magnetic cover 51 from being placed in the fifth positioning groove 1402 and causing local positive pressure to affect assembly.

[0051] The side wall of the fourth carrier 140 is provided with a positioning portion 1404, and the positioning portion 1404 is used to define the position of the fourth carrier 140 on the magnetic cover assembly device 3. The positioning portion 1404 can be a positioning groove, a positioning hole, etc.

[0052] See also Figures 8 to 9 The first assembly jig 16 includes a first carrier 160 and a second carrier 162. The first carrier 160 is provided with a first positioning groove 1602 for simultaneously positioning the magnetic conductive plate 53 and the first semi-finished product 550. The bottom of the first positioning groove 1602 is provided with a first avoidance hole 1601 for avoiding the first fastener; the second carrier 162 is provided with a second positioning groove 1622 for positioning the second semi-finished product 510. The bottom of the second positioning groove 1622 is provided with a positioning hole 1621 for accommodating the second fastener.

[0053] Among them, the first carrier 160 is used to align and snap fit with the second carrier 162, so as to stack the first semi-finished product 550 and the magnetic conductive plate 53 carried by the first carrier 160 and the second semi-finished product 510 carried by the second carrier 162 on each other, and the first fastener is sequentially passed through the plastic part 55, the top magnetic plate 54, the magnetic conductive plate 53, the bottom magnetic plate 52 and the magnetic conductive cover 51 and is fixedly connected with the second fastener located on the side of the magnetic conductive cover 51 away from the plastic part 55.

[0054] In this embodiment, the first fastener may be a screw, and the second fastener may be a nut; or, the first fastener may be a latch, and the second fastener may be a buckle, and the latch and the buckle are fixed by being snap-connected.

[0055] In other embodiments, the second fastener and the positioning hole 1621 may be eliminated, and only the first fastener is used to penetrate and fix the first semi-finished product 550, the magnetic conductive plate 53, and the second semi-finished product 510 in sequence through the first avoidance hole 1601 to form the magnetic circuit system 5. In this case, the first fastener is, for example, a pin, which can independently penetrate and fix the first semi-finished product 550, the magnetic conductive plate 53, and the second semi-finished product 510 to form the magnetic circuit system 5. Alternatively, the first through hole 511 of the magnetic conductive cover 51 is a threaded hole, and the first fastener is a screw, and the first fastener is screwed and fixed to the magnetic conductive cover 51 to form the magnetic circuit system 5.

[0056] The first carrier 160 is further provided with a first magnetic attraction member 1603, which magnetically attracts the first semi-finished product 550 and the magnetic conductive plate 53 located in the first positioning groove 1602, thereby preventing the magnetic conductive plate 53 and the first semi-finished product 550 from falling off when the first carrier 160 is buckled relative to the second carrier 162.

[0057] The second carrier 162 is provided with a first avoidance gap 1627 , and the first avoidance gap 1627 is used to avoid the clamping mechanism clamping the first carrier 160 , so as to facilitate the relative engagement of the first carrier 160 and the second carrier 162 .

[0058] A second avoidance hole 1604 is also provided at the bottom of the first positioning groove 1602, and the second avoidance hole 1604 is connected to the first positioning groove 1602. After the magnetic circuit system 5 is formed, the second avoidance hole 1604 can be used to push against the plastic part 55 to separate the first carrier 160 and the magnetic circuit system 5, and ensure that the magnetic circuit system 5 is located in the second carrier 162 after assembly.

[0059] In this embodiment, the first magnetic member 1603 is disposed on the side of the first carrier 160 away from the first positioning groove 1602, and the second avoidance hole 1604 passes through the first magnetic member 1603. The second avoidance hole 1604 is used for inserting the ejector rod and abutting the first semi-finished product 550 when the first carrier 160 and the second carrier 162 are separated. Optionally, the first magnetic member 1603 and the second avoidance hole 1604 can be staggered.

[0060] The second carrier 162 is further provided with a guide post 1626, and the first carrier 160 is provided with a guide hole 1608, and the guide hole 1608 is used for alignment and guidance with the guide post 1626. The first carrier 160 and the second carrier 162 are aligned and fastened through the guide hole 1608 and the guide post 1626, thereby being able to solve the problem that the first carrier 160 and the second carrier 162 are difficult to align and fit, or even easy to be misaligned, because the adjacent end faces of the bottom magnetic plate 52 and the top magnetic plate 54 have the same polarity, and the first semi-finished product 550 and the second semi-finished product 510 repel each other magnetically. Therefore, after the first carrier 160 and the second carrier 162 are aligned and fastened, the guide hole 1608 is penetrated in the guide post 1626, which is convenient for alignment and fastening, and can avoid mutual misalignment.

[0061] The first carrier 160 is further provided with an annular positioning rib 1607, which is arranged around the first positioning groove 1602. The annular positioning rib 1607 is inserted into the accommodating cavity 516 as the first carrier 160 and the second carrier 162 are aligned and snapped together to locate the position of the bottom magnetic plate 52 in the accommodating cavity 516, and enable the first semi-finished product 550 and the magnetic conductive plate 53 to be stacked on the bottom magnetic plate 52.

[0062] The first carrier 160 is further provided with an alignment groove 1606 , which is arranged around the annular positioning rib 1607 . The second carrier 162 is provided with an alignment protrusion 1624 , which is arranged around the second positioning groove 1622 . The alignment groove 1606 is aligned and buckled with the alignment protrusion 1624 .

[0063] In this embodiment, a positioning groove 1606 is set on the first carrier 160 to form an annular positioning rib 1607 between the positioning groove 1606 and the first positioning groove 1602. When the positioning protrusion 1624 is aligned and engaged with the positioning groove 1606, the annular positioning rib 1607 is inserted into the accommodating cavity 516 through the area surrounded by the positioning protrusion 1624.

[0064] Among them, the guide column 1626 and the guide hole 1608 are guided with relatively low precision, while the alignment groove 1606 and the alignment protrusion 1624 are positioned and assembled with relatively high precision, so that the annular positioning rib 1607 can more accurately position the position of the bottom magnetic plate 52 in the accommodating cavity 516.

[0065] In other embodiments, the alignment groove 1606 and the alignment protrusion 1624 may be eliminated, and the guide column 1626 and the guide hole 1608 may be further eliminated, so that the height and thickness of the annular positioning rib 1607 are appropriately set to have the functions of the above-mentioned features.

[0066] Further reading Fig.10The first assembly jig 16 also includes a positioning platform 164, and the positioning platform 164 is provided with a first positioning cavity 1642 and a second positioning cavity 1644. The first positioning cavity 1642 is used to carry and position the first platform 160, and the second positioning cavity 1644 is used to carry and position the second platform 162, so as to facilitate the synchronous transportation of the paired first platform 160 and the second platform 162 through the positioning platform 164, thereby facilitating the use of the paired first platform 160 and the second platform 162 to assemble the magnetic circuit system 5.

[0067] The positioning platform 164 is further provided with a second avoidance gap 1643 communicating with the first positioning cavity 1642 and a third avoidance gap 1645 communicating with the second positioning cavity 1644 . The second avoidance gap 1643 and the third avoidance gap 1645 are both used for avoiding the clamping mechanism that clamps the first platform 160 .

[0068] See also Fig.11 In this embodiment, the plastic parts assembly equipment 2 generally includes a second assembly jig conveyor line 21, a plastic parts assembly station 22, a glue dispensing station 23, a top magnetic plate assembly station 24, a pressing station 25, a glue blowing station 26, a material unloading station 27, an empty load detection station 28 and a purge station 29. The second assembly jig conveyor line 21 circulates the second assembly jig 12 and sequentially passes through the plastic parts assembly station 22, the glue dispensing station 23, the top magnetic plate assembly station 24, the pressing station 25, the glue blowing station 26, the material unloading station 27, the empty load detection station 28 and the purge station 29.

[0069] Among them, the plastic part assembly station 22 is used to load the plastic part 55 into the fourth positioning groove 1211, the glue dispensing station 23 is used to apply glue on the loaded plastic part 55, and the top magnetic plate assembly station 24 is used to load the top magnetic plate 54 into the third positioning groove 1210, so that the top magnetic plate 54 and the plastic part 55 after the glue is applied are stacked, and the second magnetic suction member 122 adsorbs the top magnetic plate 54 to prevent the top magnetic plate 54 and the plastic part 55 from jumping, so as to preliminarily form the first semi-finished product 550; the pressing station 25 is used to press the top magnetic plate 54 after the first semi-finished product 550 is preliminarily formed, so that the top magnetic plate 54 and the plastic part 55 are tightly bonded; the glue blowing station 26 is used to blow the pressed first semi-finished product 550, so that the volatilized glue is blown away with the air flow. The second assembly jig 12 is kept away from the gaseous glue to prevent the condensation of the first semi-finished product 550 or the second assembly jig 12; the glue in the first semi-finished product 550 condenses as it is conveyed by the second assembly jig conveyor line 21, so that the first semi-finished product 550 is fixed as a whole, and the unloading station 27 is used to transfer the fixed first semi-finished product 550 to the finished product assembly equipment 4; the empty detection station 28 is used to detect whether there is still the first semi-finished product 550 in the second assembly jig 12 after unloading, and if there is the first semi-finished product 550, a reminder signal is issued; the purge station 29 is used to purge the empty second assembly jig 12 before assembling the plastic part 55 to clean the second assembly jig 12, which is beneficial to improve the quality of assembling the first semi-finished product 550.

[0070] In other embodiments, the plastic parts assembly equipment 2 may not include the pressing station 25, the glue blowing station 26, the empty load detection station 28 and the purging station 29. Alternatively, the plastic parts assembly equipment 2 only includes an assembly station and a glue dispensing station, wherein the assembly station is used to sequentially load the plastic parts 55 and the top magnetic plate 54 to the second assembly fixture 12, and the glue dispensing station is used to apply glue on the plastic parts 55.

[0071] In this embodiment, the plastic parts assembly station 22 includes a plastic parts loading device 220 and a plastic parts picking device 221. The plastic parts loading device 220 is used to sequentially provide plastic parts 55, and the plastic parts picking device 221 is used to pick up the plastic parts 55 provided by the plastic parts loading device 220 and load the plastic parts 55 into the fourth positioning groove 1211. The plastic parts picking device 221 can be a suction cup or a clamping claw mechanism, which can pick up the plastic parts 55.

[0072] The top magnetic plate assembly station 24 includes a magnet loading device 240 and a magnetic suction device 241. The magnet loading device 240 is used to provide a top magnetic plate 54. The magnetic suction device 241 is used to pick up the top magnetic plate 54 provided by the magnet loading device 240 and load the top magnetic plate 54 into the third positioning groove 1210 so that the top magnetic plate 54 is stacked with the plastic part 55 after the glue is applied.

[0073] The pressing station 25 includes a driving mechanism and a pressing piece. The driving mechanism is connected to the pressing piece and drives the pressing piece to move up and down. After the top magnetic plate 54 and the plastic part 55 are stacked and bonded to initially form the first semi-finished product 550, the top magnetic plate 54 is pressed for a period of time to make the top magnetic plate 54 and the plastic part 55 tightly and evenly bonded.

[0074] The glue blowing station 26 can be a device such as a fan or a blower, which continuously provides wind power to take away the volatile glue liquid and accelerate the solidification of the glue liquid, so that the first semi-finished product 550 is fixed into a whole faster.

[0075] The empty detection station 28 may be a photoelectric sensor or a camera, which is used to detect and identify whether the first semi-finished product 550 is still present in the second assembly jig 12. The purge station 29 may be a negative pressure pipe, which is used to absorb the debris in the second assembly jig 12; or the purge station 29 may be a felt, etc., which is used to clean and remove the debris in the second assembly jig 12.

[0076] See also Fig.12 In this embodiment, the magnetic cover assembly equipment 3 generally includes a fourth carrier conveyor line 30, a magnetic cover assembly station 31, a glue dispensing station 32, a fifth carrier loading mechanism 33, a bottom magnetic plate assembly station 34, a glue cleaning station 35, a heating station 36, a fifth carrier unloading mechanism 37, a material unloading station 38 and a purge station 39. The fourth carrier conveyor line 30 circulates and transports the fourth carrier 140 to sequentially pass through the magnetic cover assembly station 31, the glue dispensing station 32, the fifth carrier loading mechanism 33, the bottom magnetic plate assembly station 34, the glue cleaning station 35, the heating station 36, the fifth carrier unloading mechanism 37, the material unloading station 38 and the purge station 39.

[0077] Among them, the magnetic cover assembly station 31 is used to load the magnetic cover 51 into the fifth positioning groove 1402; the glue dispensing station 32 is used to apply glue in the assembly area on the bottom wall 512 that is assembled with the bottom magnetic plate 52; the fifth carrier loading mechanism 33 is used to transport the fifth carrier 142 and the fourth carrier 140 for alignment and assembly, and insert the fifth carrier 142 into the accommodating cavity 516 to locate the assembly area on the bottom wall 512 that is assembled with the bottom magnetic plate 52; the bottom magnetic plate assembly station 34 is used to load the bottom magnetic plate 52 to the assembly area via the guide channel 1422, so that the bottom magnetic plate 52 is assembled and fixed with the assembly area of ​​the bottom wall 512, and is spaced from the annular circumferential wall 514; the glue cleaning station 35 cleans the first through hole 511 and the second through hole 520 after the magnetic cover 51 and the bottom magnetic plate 52 are stacked on each other , to prevent the glue from solidifying and blocking the first through hole 511 and the second through hole 520, so as to facilitate the subsequent fixing of the magnetic circuit system 5; the heating station 36 is used to heat and insulate the magnetic cover 51 and the bottom magnetic plate 52 after bonding, so as to accelerate the solidification of the glue, so that the second semi-finished product 510 is fixed as a whole; the fifth platform unloading mechanism 37 is used to remove the fifth carrier 142 assembled with the fourth carrier 140 after the bottom magnetic plate 52 and the magnetic cover 51 are fixed as a whole after heating treatment, so as to facilitate the subsequent unloading of the second semi-finished product 510; the unloading station 38 is used to transfer the second semi-finished product 510 to the finished product assembly equipment 4; the purging station 39 is used to purge the fourth carrier 140 before the magnetic cover 51 is assembled to clean the fourth carrier 140, which is beneficial to improve the quality of the assembled second semi-finished product 510.

[0078] An empty-load detection station is also provided between the unloading station 38 and the purging station 39. The empty-load detection station is used to detect whether there is still a second semi-finished product 510 in the fourth carrier 140 after unloading. If there is a second semi-finished product 510, a reminder signal is issued.

[0079] Furthermore, the magnetic cover assembly equipment 3 also includes a fifth carrier conveyor line 310, which is used to transport the fifth carrier 142 unloaded by the fifth carrier unloading mechanism 37 to a position where the fifth carrier loading mechanism 33 can pick it up, so that the fifth carrier 142 can be recycled.

[0080] The fifth stage conveying line 310 may be a belt conveying mechanism, and further the belt circulates to convey the fifth stage 142. The fifth stage conveying line 310 may be a roller mechanism, and the fifth stage 142 is circulated to convey the fifth stage 142 through a plurality of rollers arranged side by side.

[0081] In this embodiment, the magnetic cover assembly station 31 includes a magnetic cover loading device 312 and a magnetic suction device 311. The magnetic cover loading device 312 is used to provide magnetic covers 51 in sequence, and the magnetic suction device 311 is used to pick up the magnetic covers 51 provided by the magnetic cover loading device 312 and load the magnetic covers 51 into the fifth positioning groove 1402.

[0082] The fifth carrier loading mechanism 33 and the fifth carrier unloading mechanism 37 both include a driving mechanism 330 and a picking mechanism 331. The driving mechanism 330 is connected to the picking mechanism 331 and drives the picking mechanism 331 to move back and forth between the fourth carrier conveyor line 30 and the fifth carrier conveyor line 310. The picking mechanism 331 is used to pick up and place the fifth carrier 142.

[0083] The picking mechanism 331 can be a finger-gripping cylinder or a suction cup; the driving mechanism 330 includes a motor and a cylinder, the motor drives the picking mechanism 331 to move back and forth between the fourth carrier conveyor line 30 and the fifth carrier conveyor line 310, and the cylinder drives the picking mechanism 331 to rise and fall to avoid interference with other components; the driving mechanism 330 can also include multiple cylinders or multiple motors to achieve the above functions.

[0084] The bottom magnetic plate assembly station 34 includes a magnet loading device 340 and a magnetic suction device 341. The magnet loading device 340 is used to provide the bottom magnetic plate 52 in sequence. The magnetic suction device 341 is used to pick up the bottom magnetic plate 52 provided by the magnet loading device 340 and load the bottom magnetic plate 52 to the assembly area on the bottom wall 512 through the guide channel 1422.

[0085] The glue cleaning station 35 includes an ejector pin, a driving mechanism and a wiping mechanism. After the ejector pin is aligned with the second through hole 520, the driving mechanism drives the ejector pin to pass through the second through hole 520, the first through hole 511 and the avoidance hole 1406 in sequence to clean the glue in the second through hole 520 and the first through hole 511. The wiping mechanism wipes the ejector pin portion passing through the avoidance hole 1406 to remove the glue on the ejector pin.

[0086] The heating station 36 includes a heat source, which provides heat to insulate the preliminarily formed second semi-finished product 510 to accelerate the solidification of the glue.

[0087] After passing through the heating station 36, the second semi-finished product 510 is fixed into a whole, and then the fifth carrier unloading mechanism 37 takes away the fifth carrier 142 and places it on the fifth carrier conveyor line 310, thereby exposing the second semi-finished product 510, and the unloading station 38 transfers the second semi-finished product 510 to the finished product assembly equipment 4, and then the empty load detection station detects whether there is still the first semi-finished product 550 in the fourth carrier 140, and the purge station 39 purges the empty fourth carrier 140.

[0088] See also Figures 13 to 16 In this embodiment, the finished product assembly equipment 4 generally includes a first assembly jig conveyor line 410, a first semi-finished product assembly station 412, a second semi-finished product assembly station 414, a glue dispensing station 416, a magnetic plate assembly station 418, a flipping device 420, a guide pressing member 422, an assembly mechanism 424, a push rod mechanism 426, a detection device 428, a sorting station 430, and a second fastener assembly station 432. The first assembly jig conveyor line 410 circulates and conveys the first assembly jig 16 to pass through the second semi-finished product assembly station 414, the first semi-finished product assembly station 412, the glue dispensing station 416, the magnetic plate assembly station 418, the flipping device 420, the guide pressing member 422, the assembly mechanism 424, the push rod mechanism 426, the detection device 428, the sorting station 430, and the second fastener assembly station 432 in sequence.

[0089] Among them, the first semi-finished product assembly station 412 is used to load the first semi-finished product 550 into the first positioning groove 1602, the second semi-finished product assembly station 414 is used to load the second semi-finished product 510 into the second positioning groove 1622, and the glue dispensing station 416 is used to apply glue on the bottom magnetic plate 52 and the top magnetic plate 54; the magnetic conductive plate assembly station 418 is used to load the magnetic conductive plate 53 into the first positioning groove 1602 so as to be stacked with the top magnetic plate 54; the flipping device 420 is used to flip the first carrier 160 carrying the first semi-finished product 550 and the magnetic conductive plate 53, and align and engage with the second carrier 162 carrying the second semi-finished product 510, so that the first semi-finished product 550, the magnetic conductive plate 53 and the second semi-finished product 510 are stacked on each other.

[0090] The guide pressing member 422 is used to press the first carrier 160 and the second carrier 162 which are buckled together. The guide pressing member 422 is provided with an assembly opening 4220 aligned with the first avoidance hole 1601; the assembly mechanism 424 is used to insert the first fastener through the assembly opening 4220 and the first avoidance hole 1601, and the first fastener penetrates the first semi-finished product 550, the magnetic conductive plate 53 and the second semi-finished product 510, so that the magnetic circuit system 5 is fixed as a whole; the push rod mechanism 426 is used to penetrate the second avoidance hole 1604 It pushes against the magnetic circuit system 5, and after the first carrier 160 is separated from the magnetic circuit system 5, it is pulled out from the second avoidance hole 1604; the flipping device 420 is also used to lift the first carrier 160 when the push rod mechanism 426 is inserted into the second avoidance hole 1604, and flip the first carrier 160 after the push rod mechanism 426 is pulled out from the second avoidance hole 1604, and place the first carrier 160 on the first assembly jig conveyor line 410, so that the first carrier 160 and the corresponding second carrier 162 are arranged side by side.

[0091] The detection device 428 is used to detect the quality of the magnetic circuit system 5 located in the second positioning groove 1622. The sorting station 430 is used to load the magnetic circuit system 5 with qualified quality into a tray and sort the magnetic circuit system 5 with unqualified quality into a recycling box; the second fastener assembly station 432 is used to load the second fastener into the positioning hole 1621 in the empty second carrier 162.

[0092] The magnetic plate assembly station 418 includes a magnetic plate loading device 4181 and a magnetic suction device 4182. The magnetic plate loading device 4181 is used to provide magnetic plates 53 in sequence, and the magnetic suction device 4182 is used to pick up the magnetic plates 53 provided by the magnetic plate loading device 4181, and load the magnetic plates 53 into the first positioning groove 1602 so as to be stacked with the top magnetic plate 54.

[0093] In this embodiment, there are two flipping devices 420, one of which is located upstream of the guide pressing member 422, and the other flipping device 420 is located downstream of the guide pressing member 422. The upstream flipping device 420 is used to flip the first carrier 160 so as to align and engage with the second carrier 162, and the downstream flipping device 420 is used to separate the first carrier 160 and the second carrier 162 that are engaged with each other.

[0094] In other embodiments, the number of the flipping device 420 can also be one, and the flipping device 420 can reciprocate upstream and downstream of the guide pressing member 422 to take into account the alignment, buckling and separation of the first carrier 160 and the second carrier 162.

[0095] See also Fig.14 The flip device 420 includes a telescopic mechanism 4201, a lifting mechanism 4203, a rotating mechanism 4205 and a clamping mechanism 4207. The clamping mechanism 4207 is used to clamp the first carrier 160. The clamping mechanism 4207 includes two clamping ends, and the two clamping ends respectively clamp a side away from the first positioning groove 1602 and a side opposite thereto; the telescopic mechanism 4201 is used to drive the clamping mechanism 4207 to move toward the notch on the first assembly jig conveyor line 410, so that the two opened clamping ends are respectively located on both sides of the first carrier 160 aligned with the notch; the lifting mechanism 4203 is used to drive The clamping mechanism 4207 that dynamically clamps the first carrier 160 performs a lifting movement so that the first carrier 160 and the second carrier 162 can be aligned, engaged or separated; after the lifting mechanism 4203 makes the clamping mechanism 4207 that clamps the first carrier 160 suspended in the air, the rotating mechanism 4205 is used to drive the clamping mechanism 4207 to perform a flipping movement so that the first carrier 160 is placed directly above the second carrier 162, and the first positioning groove 1602 and the second positioning groove 1622 are spaced apart and arranged opposite to each other, or the first carrier 160 located directly above the second carrier 162 is misaligned with the second carrier 162.

[0096] When separating the first platform 160 and the second platform 162 that are interlocked with each other, the telescopic mechanism 4201 is used to drive the clamping mechanism 4207 to move toward the notch on the first assembly jig conveyor line 410, so that one clamping end of the clamping mechanism 4207 is located on the side facing the first platform 160 and the second platform 162 through the first avoidance notch 1627, and the other clamping end is located on the other side opposite to the first platform 160 and the second platform 162, thereby clamping the first platform 160 from both sides of the first platform 160.

[0097] After the turning device 420 aligns and engages the first carrier 160 and the second carrier 162 , the engaged first carrier 160 and the second carrier 162 will pass through the guide pressing member 422 , which is used to press the first semi-finished product 550 and the second semi-finished product 510 which repel each other.

[0098] See also Fig.15 The guide and holding member 422 is provided with a guide slope 4221 and a holding plane 4223. The first assembly jig conveyor line 410 conveys the first carrier 160 and the second carrier 162 which are interlocked with each other through the guide slope 4221 and the holding plane 4223 in sequence. The interlocking first carrier 160 and the second carrier 162 are gradually interlocked and tightly fitted with each other under the action of the guide slope 4221. The holding plane 4223 is used to keep the first carrier 160 and the second carrier 162 in a tightly fitted state.

[0099] The assembly opening 4220 is located on the holding plane 4223. After the assembly opening 4220 and the first avoidance hole 1601 are aligned, the assembly mechanism 424 inserts fasteners through the assembly opening 4220 and the first avoidance hole 1601 to the first semi-finished product 550, the magnetic conductive plate 53 and the second semi-finished product 510 to fix the magnetic circuit system 5 into a whole.

[0100] The assembly mechanism 424 includes a fastener feeder 4241 and an electric screwdriver 4243 . The electric screwdriver 4243 loads the first fastener from the fastener feeder 4241 , and inserts the first fastener into the assembly port 4220 and the first avoidance hole 1601 to assemble the magnetic circuit system 5 .

[0101] The electric screwdriver device 4243 includes a driving mechanism and an electric screwdriver. The driving mechanism drives the electric screwdriver to load the first fastener from the fastener feeder 4241 and aligns the electric screwdriver with the assembly port 4220 to insert the first fastener into the magnetic circuit system 5.

[0102] In this embodiment, the first fastener is a screw, which is fixedly connected to the second fastener (nut) located in the positioning hole 1621 so that the magnetic circuit system 5 forms a whole.

[0103] Therefore, before the second semi-finished product assembly station 414 loads the second semi-finished product 510 into the second positioning groove 1622 , the second fastener assembly station 432 loads the second fastener into the positioning hole 1621 .

[0104] The second fastener assembly station 432 includes a second fastener loading device 4321 and a second fastener picking device 4323 . The second fastener loading device 4321 is used to provide the second fasteners in sequence, and the second fastener picking device 4323 is used to load the second fasteners provided in sequence into the positioning holes 1621 .

[0105] After forming the magnetic circuit system 5, the first carrier 160 and the second carrier 162 need to be separated to facilitate the removal of the magnetic circuit system 5. However, during the removal of the first carrier 160, the magnetic circuit system 5 may move synchronously with the first carrier 160, thus causing difficulties in subsequent unloading.

[0106] See also Fig.16 The push rod mechanism 426 includes a push rod 4261 and a push rod driving mechanism 4263. The push rod driving mechanism 4263 drives the push rod 4261 to penetrate into the second avoidance hole 1604 and press against the magnetic circuit system 5, and drives the push rod 4261 to be pulled out of the second avoidance hole 1604 after the first carrier 160 is separated from the magnetic circuit system 5. The flipping device 420 is also used to lift the first carrier 160 along the push rod 4261 when the push rod 4261 is inserted into the second avoidance hole 1604, flip the first carrier 160 after the push rod 4261 is pulled out of the second avoidance hole 1604, and place the first carrier 160 on the carrier conveying line 410, so that the first carrier 160 and the corresponding second carrier 162 are arranged side by side.

[0107] The present application sets a push rod mechanism 426 to push against the magnetic circuit system 5 when the first carrier 160 and the second carrier 162 are separated and engaged, so as to ensure that the formed magnetic circuit system 5 is located on the second carrier 162, which is convenient for subsequent detection and sorting of the magnetic circuit system 5.

[0108] The detection device 428 includes an image acquisition device, which is used to acquire an image of the magnetic circuit system 5, and then identify whether the magnetic circuit system 5 has defects such as cracks or dislocations based on the acquired image. If no defects are detected, the quality of the magnetic circuit system 5 is qualified, and if defects are detected, the quality of the magnetic circuit system 5 is unqualified. For example, when the first semi-finished product 550, the magnetic conductive plate 53, and the second semi-finished product 510 are fixed by screws, cracks are generated on the top magnetic plate 54 due to excessive force, which will cause the magnetic circuit system 5 to be scrapped, so the unqualified magnetic circuit system 5 can be identified by the detection device 428.

[0109] The detection device 428 feeds back the detection result to the sorting station 430, and the sorting station 430 is used to sort the magnetic circuit system 5 detected by the detection device 428, and put the magnetic circuit system 5 with qualified quality on a tray, and sort the magnetic circuit system 5 with unqualified quality into a recycling box.

[0110] Different from the prior art, the present application discloses an assembly jig for a magnetic circuit system. By setting a first carrier and a second carrier, wherein the first carrier is provided with a first positioning groove, and the second carrier is provided with a second positioning groove, the first carrier can also be aligned and snapped with the second carrier, so that the top magnetic plate located on the first carrier and the bottom magnetic plate located on the second carrier can be stacked even if the magnetic poles of the same polarity are arranged opposite to each other, and further a first avoidance hole is provided at the bottom of the first positioning groove, so as to facilitate the first fastener to be inserted through the first avoidance hole to fix the magnetic circuit system.

[0111] The above descriptions are merely embodiments of the present application and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. An assembly jig for a magnetic circuit system, characterized in that: The magnetic circuit system includes a magnetic conductive cover, the magnetic conductive cover includes a bottom wall and an annular peripheral wall connected to the bottom wall, thereby forming a containing cavity, the magnetic circuit system includes a bottom magnetic plate, a magnetic conductive plate, a top magnetic plate and a plastic part which are contained in the containing cavity and are sequentially stacked on the bottom wall, the adjacent end faces of the bottom magnetic plate and the top magnetic plate have the same polarity, the assembly jig includes a first assembly jig, and the first assembly jig includes: A first carrier is provided with a first positioning groove for simultaneously positioning the magnetic conductive plate and a first semi-finished product, wherein the first semi-finished product comprises the top magnetic plate and the plastic part which are stacked and fixed to each other, and a first avoidance hole is provided at the bottom of the first positioning groove; A second carrier is provided with a second positioning groove for positioning a second semi-finished product, wherein the second semi-finished product includes the magnetic conductive cover and the bottom magnetic plate accommodated in the accommodating cavity and fixed to the bottom wall; Among them, the first carrier is also used to align and snap fit with the second carrier, so that the first semi-finished product, the magnetic conductive plate and the second semi-finished product are stacked on each other, and the first fastener is allowed to pass through the first avoidance hole to sequentially penetrate the first semi-finished product, the magnetic conductive plate and the second semi-finished product and connect with the second fastener to fix the first semi-finished product, the magnetic conductive plate and the second semi-finished product to form the magnetic circuit system.

2. The assembly jig according to claim 1, characterized in that: The first carrier is further provided with a first magnetic attraction member, and the first magnetic attraction member is used to prevent the magnetic conductive plate and the first semi-finished product from falling off when the first carrier is buckled relative to the second carrier.

3. The assembly jig according to claim 2, characterized in that: The first magnetic attraction member is arranged on a side of the first carrier away from the first positioning groove, and a second avoidance hole is provided at the bottom of the first positioning groove. The second avoidance hole further penetrates the first magnetic attraction member, and the second avoidance hole is used for allowing the push rod to be inserted and to push against the first semi-finished product when the first carrier and the second carrier are separated.

4. The assembly jig according to claim 1, characterized in that: The first carrier is further provided with an annular positioning rib, and the annular positioning rib is arranged around the first positioning groove. The annular positioning rib is inserted into the accommodating cavity as the first carrier and the second carrier are aligned and snapped together to locate the position of the bottom magnetic plate in the accommodating cavity, and enable the first semi-finished product and the magnetic conductive plate to be stacked on the bottom magnetic plate.

5. The assembly jig according to claim 4, characterized in that: The first carrier is also provided with an alignment groove, which is arranged around the annular positioning rib. The second carrier is provided with an alignment protrusion, which is arranged around the second positioning groove. The alignment groove is aligned and buckled with the alignment protrusion.

6. The assembly jig according to claim 1, characterized in that: The second carrier is further provided with a guide column, and the first carrier is provided with a guide hole, and the guide hole is used for alignment and guiding cooperation with the guide column.

7. The assembly jig according to claim 1, characterized in that: The second carrier is provided with a first avoidance gap, and the first avoidance gap is used to avoid the clamping mechanism that clamps the first carrier; the bottom of the second positioning groove is provided with a positioning hole for accommodating the second fastener, the first fastener is a screw, and the second fastener is a nut, or the first fastener is a pin, and the second fastener is a buckle.

8. The assembly jig according to claim 7, characterized in that: The first assembly fixture further includes a positioning platform, the positioning platform is provided with a first positioning cavity and a second positioning cavity, the first positioning cavity is used for carrying and positioning the first platform, and the second positioning cavity is used for carrying and positioning the second platform; The positioning platform is further provided with a second avoidance gap communicating with the first positioning cavity and a third avoidance gap communicating with the second positioning cavity.

9. The assembly jig according to claim 8, characterized in that: The assembly jig further includes a second assembly jig, and the second assembly jig includes: A third carrier is provided with a third positioning groove, a fourth positioning groove and a receiving groove which are sequentially connected to the inside of the surface of the third carrier, the fourth positioning groove is provided at the bottom of the third positioning groove, and the receiving groove is provided at the bottom of the fourth positioning groove; A second magnetic attraction member is disposed in the receiving groove; Wherein, the third positioning groove is used to position the top magnetic plate, the fourth positioning groove is used to position the plastic part, and the second magnetic attraction member is used to magnetically adsorb the top magnetic plate.

10. The assembly jig according to claim 9, characterized in that: The assembly jig further includes a third assembly jig, and the third assembly jig includes: The fourth carrier is provided with a fifth positioning groove for positioning the annular peripheral wall of the magnetic conductive cover; The fifth carrier is provided with a guide channel. The fifth carrier is assembled in alignment with the fourth carrier and inserted into the receiving cavity of the magnetic conductive cover to locate an assembly area on the bottom wall to be assembled with the bottom magnetic plate. The bottom magnetic plate is placed in the receiving cavity through the guide channel, and can then be assembled and fixed with the assembly area of ​​the bottom wall and spaced apart from the annular circumferential wall.

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