A production fixture and production method for a rotor assembly

Abstract

The present invention provides a production jig and a production method for a rotor assembly. The production jig includes a base, a taking-out mechanism and a reset unit. The base is provided with a coil positioning boss, an oscillator positioning groove, a PCB positioning post and a reset unit. During the production process, the coil and the oscillator of the rotor assembly can be simultaneously fixed on the corresponding coil positioning boss, oscillator positioning groove and PCB positioning post, and the coil, the oscillator and the PCB are bonded and fixed into a whole through glue dots. The rotor assembly is taken out by pressing the taking-out mechanism, and the initial state of the production jig is restored by the reset unit. The coil positioning boss, the oscillator positioning groove and the PCB positioning post on the production jig can effectively ensure the accurate positioning of the rotor assembly, facilitate the realization of automatic production while improving the production efficiency and product quality.

Description

Technical Field:

[0001] The present invention relates to the production field of a micro motor rotor, and particularly to a production jig and a production method for a rotor assembly. Background Art:

[0002] With the rapid development of electronic product technology, in portable electronic products such as mobile phones, handheld game consoles or handheld multimedia entertainment devices, a micro vibration motor is generally used for system feedback. For example, the incoming call prompt of a mobile phone, the vibration feedback of a game console, etc. The increasingly flattened and miniaturized portable electronic products require the micro vibration motor to be more miniaturized and flattened, and at the same time, production efficiency and product stability are also required.

[0003] The flat vibration motor is one of the commonly used micro vibration motors at present, and it more meets the miniaturization and flattening requirements of terminal manufacturers. Among them, the rotor of the flat vibration motor, as an important part of the entire flat vibration motor, generally includes components such as a rotor assembly, a vibrator and a bearing. The rotor assembly includes two components, a coil and a PCB. In the current rotor production process, the coil is first bonded to the fixed pattern position of the PCB to form an integrated rotor assembly, the lead wire of the coil is welded to the PCB to realize rotor power connection, and then the vibrator, the bearing and the rotor assembly are respectively placed into a plastic mold cavity manually for injection molding to form a rotor. Since the vibrator is separately arranged from the rotor assembly and the weight of the vibrator is large, during the injection molding process, the vibrator is likely to shift in position in the mold cavity, and the vibrator deviating from the mold cavity is extremely likely to damage the injection mold, resulting in low production efficiency and low yield of the rotor assembly. At the same time, there are three components manually placed in the injection mold cavity. The more components are manually inserted into the mold, the more likely it is to have misassembly and missing assembly, increasing the unstable factors of injection molding, resulting in a high mold damage rate and a high product production scrap rate.

[0004] In order to solve the above technical problems, it is urgent to develop a more efficient production method and production jig for the rotor assembly, reduce manual processes, improve the production efficiency of the rotor, improve the production quality of the rotor, reduce the scrapping of plastic molds, and at the same time, more efficiently realize automated production. Summary of the Invention:

[0005] The present invention provides a production jig and a production method for a rotor assembly to solve the problems of low production efficiency, high mold scrap rate and unstable product process quality caused by manual operation in the prior art.

[0006] To achieve the above object, the present invention is realized through the following technical solutions:

[0007] The present invention provides a production jig for a rotor assembly, comprising a base, a take-out mechanism and a connecting column, wherein a plurality of rotor positioning units are evenly arranged on the upper end surface of the base, and adjacent rotor positioning units are spaced apart by slots, the take-out mechanism is provided with a control rod and a plurality of latch teeth connected by the control rod, the base and the take-out mechanism are respectively provided with a first axial hole and a second axial hole, the base and the take-out mechanism are hingedly fixed by a connecting column penetrating the first axial hole and the second axial hole, the take-out mechanism can rotate around the connecting column, and the rotor positioning unit is provided with a PCB positioning column, a coil positioning boss and a vibrator positioning groove.

[0008] Furthermore, the base is provided with a resetting unit.

[0009] Furthermore, the plurality of rotor positioning units are provided with at least two PCB positioning columns, each rotor positioning unit is provided with two coil positioning bosses and one vibrator positioning groove, the two coil positioning bosses are symmetrically spaced in an eight-shaped shape, and the vibrator positioning groove is located on a side close to the control rod.

[0010] Furthermore, the latching teeth are provided with a cut angle, and the control rod is connected to a side of the cut angle.

[0011] Furthermore, the base is provided with a first step and a second step, and the first step is adjacent to the upper side of the second step.

[0012] Furthermore, the latching tooth is located in the latching groove, and the control rod is located on the first step.

[0013] Furthermore, the bottom surface of the first step is a horizontal surface, and the surface of the second step is an inclined surface.

[0014] Furthermore, the latching tooth is placed in the latching groove, and the control rod is located above the first step.

[0015] Furthermore, the upper surface of the latching teeth is lower than or flush with the upper surface of the base.

[0016] The present invention provides a production method of a rotor assembly production jig using the present invention, and the production method comprises the following steps: placing the production jig in an initial state; sleeve the coil and the vibrator on the coil positioning boss and the vibrator positioning groove of the rotor positioning unit respectively; dispensing glue on the opposite sides of the contact surfaces of the coil and the vibrator with the base; crimping the PCB onto the coil and the vibrator through the PCB positioning column, and bonding and fixing the PCB, the coil and the vibrator through the dispensing glue; hot pressing the PCB, the coil and the vibrator to form an integrated rotor assembly; pressing the control rod, the removal mechanism rotates along the connecting column, the latch teeth are tilted from the latch groove, and the latch teeth push the rotor assembly upward to detach from the rotor positioning unit, thereby removing the rotor assembly from the production jig.

[0017] Furthermore, the pressed control rod is released, and the taking-out mechanism restores the production jig to an initial state through a reset unit arranged on the base.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. Efficiently introduce automated production, reduce manual operation procedures, and improve production efficiency;

[0020] 2. It avoids the uncontrollable factors of manual operation, improves the quality stability and reliability of product production process, and greatly improves product quality;

[0021] 3. As the number of rotor parts entering the mold is reduced, the probability of missing or incorrectly installed rotor parts entering the mold is reduced, and the rate of product failure and scrapping is reduced.

[0022] 4. Avoid the position deviation of parts due to too many parts in the cavity, which may cause the rotor parts to shift and wrap, scratch other parts, and damage the injection mold. Description of the drawings:

[0023] Figure 1 It is a schematic diagram of the three-dimensional structure of the rotor assembly production jig of the present invention.

[0024] Figure 2 It is a schematic diagram of the three-dimensional structure of the rotor assembly production jig base of the present invention.

[0025] Figure 3 This is a schematic diagram of the assembly structure of the removal mechanism and the connecting column of the rotor assembly production jig of the present invention.

[0026] Figure 4 It is a three-dimensional structural schematic diagram of the rotor assembly production jig removal mechanism of the present invention.

[0027] Figure 5 For the present invention Figure 1 A cross-sectional view taken along line AA of a rotor assembly production jig is shown.

[0028] Figure 6 It is a schematic structural diagram of the rotor assembly of the present invention.

[0029] Figure markings: 1-production jig, 10-base, 11-rotor positioning unit, 110-PCB positioning column, 111-coil positioning boss, 112-vibrator positioning groove, 103-first axial hole, 104-slot, 105-first step, 106-second step, 12-removal mechanism, 120-control rod, 121-grip, 122-angle cut, 123-second axial hole, 13-connecting column, 14-rotor, 140-vibrator, 141-coil, 142-PCB, 143-bearing hole, 15-reset magnet. Detailed implementation manner:

[0030] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Components of the embodiments of the present invention usually described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0031] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0032] The present invention discloses a rotor of a flat vibration motor. The rotor (not shown) includes a rotor assembly 14, a bearing (not shown), etc. The rotor assembly includes three components: an oscillator 140, a coil 141, and a PCB 142. During the production of the rotor, first, the oscillator 140, the coil 141, and the PCB 142 are fixedly bonded together through a production fixture 1 to form an integrated rotor assembly 14, and the leads of the coil are welded to the patterns on the PCB to achieve power connection of the coil. Then, the bearing and the rotor assembly 14 are manually placed into the cavity of a plastic mold (not shown) respectively to form the rotor assembly 14 by injection molding. During the injection molding process, since the oscillator 140, the coil 141, and the PCB 142 are integrally arranged, the heavy oscillator component is not likely to shift in position in the cavity, reducing the damage rate of the injection mold, reducing the number of components entering the mold, and reducing the manual placement process. Through the production fixture and production method of the present invention, automatic placement and assembly of more components are realized to form an integrated rotor assembly.

[0033] The following will describe in detail the production fixture and production method of the rotor assembly of the present invention with reference to the accompanying drawings.

[0034] Embodiment 1

[0035] See Figures 1 - 5, a production jig 1 for a rotor assembly, comprising a base 10, a taking-out mechanism 12 and a connecting column 13. The upper end surface of the base 10 is evenly provided with a number of rotor positioning units 11, and the adjacent rotor positioning units 11 are spaced apart by the card slots 104 of the base. The taking-out mechanism 12 is provided with a control rod 120 and a number of teeth 121 connected by the control rod. The base 10 and the taking-out mechanism 12 are respectively provided with a first shaft hole 103 and a second shaft hole 123. The base 10 and the taking-out mechanism 12 are hinged and fixed by the connecting column 13 passing through the first shaft hole 103 and the second shaft hole 123. The rotor positioning unit is provided with a PCB positioning post 110, a coil positioning boss 111 and an oscillator positioning groove 112. The PCB positioning post 110, the coil positioning boss 111 and the oscillator positioning groove 112 are spaced apart. The uniform spacing of the rotor positioning units is more conducive to automated production.

[0036] A number of rotor positioning units 11 are continuously arranged on the upper end surface of the base 10. Among the number of rotor positioning units 11, at least two of the PCB positioning posts 110 are located at the geometric center of the plane of the rotor positioning unit 11. Each rotor positioning unit 110 includes two coil positioning bosses 111, which are symmetrically spaced apart in a V-shaped pattern. The oscillator positioning groove 112 is arranged on the side close to the control rod 120. The coil positioning boss 111 is elliptical in shape and matches the hollow part inside the coil 141, and its height is the same as the thickness of the coil 141. The PCB positioning post 110 is cylindrical in shape. The shape of the bearing hole 143 roughly matches the shape of the PCB positioning post, and its diameter is smaller than the diameter of the bearing hole 143, which is convenient for sleeving or popping out well during the process of assembling the PCB 142. The height of the PCB positioning post 110 is also much higher than the thickness of the PCB 142, preventing the rotor assembly 14 from falling off or shifting during the assembly process. The oscillator positioning groove 112 is a fan-shaped groove, which matches the shape of the oscillator 140, and the depth of the oscillator positioning groove 112 is the same as the thickness of the oscillator 140. The two radius sides of the fan shape of the oscillator positioning groove 112 are set to be arc-shaped inward, providing a space for the coil 141 to avoid, and at the same time, it can improve the eccentricity of the rotor, thereby increasing the vibration amount.

[0037] The base 10 is provided with a first step 105 and a second step 106. The first step 105 and the second step 106 form a continuous step. The first step is adjacent to the upper side of the second step. The bottom surface of the first step 105 is a horizontal plane. The second step 106 is a step inclined relative to the lower end surface of the base. The first step 105 reserves space for the control rod 120 of the taking-out mechanism. Adjacent rotor positioning units 11 are separated by a card slot 104. The depth of the card slot 104 is the same as the height of the first step 105 and is matched with the card teeth 121 of the taking-out mechanism. An axially penetrating first shaft hole 103 is arranged near the end face of the rotor positioning unit 11. The first shaft hole 103 is used for fixedly connecting with the connecting column 13. The length of the connecting column 11 is the same as the axial length of the base 10, and at the same time, it prevents the connecting column 11 from protruding from the base 10, saving space and preventing the protruding connecting column 11 from interfering with other devices, which is beneficial to automated production.

[0038] The taking-out mechanism 12 includes card teeth 121 and a control rod 120. The control rod 120 is in the shape of a rectangular prism. A number of card teeth 121 are arranged on the side cooperating with the base 10. The number of card teeth 121 is the same as the number of card slots 104. The height of the card teeth 121 is less than or equal to the depth of the card slot 104, and the width of the card teeth 121 is the same as the width of the card slot 104, which is convenient for the cooperation and fixation between the base 10 and the taking-out mechanism 12, and at the same time ensures that the card teeth 121 can rotate freely in the card slot 104.

[0039] The card teeth 121 are slightly square with chamfered corners, and the control rod is connected to the side of the chamfered corner. When the card teeth 121 are fixedly connected with the base 10, a certain gap is formed between the chamfered corner 122 and the first step 105. A second shaft hole 123 with the same size as the first shaft hole 103 is arranged at the position of the card teeth 121 corresponding to the first shaft hole 103 for fixedly connecting with the connecting column 11. One card tooth corresponds to one card slot, and the distance between adjacent card teeth 121 is the same as the distance between adjacent card slots 104. The upper surface of the card teeth 121 is lower than or flush with the upper surface of the base 10, ensuring that the card teeth 121 are completely received in the card slot 104 and ensuring that the upper surface of the production jig 1 is on the same horizontal plane.

[0040] During the assembly of the production jig 1, first insert the card teeth 121 of the taking-out mechanism into the card slots 104 of the base correspondingly. After the first shaft hole 103 of the base coincides with the second shaft hole 123 of the taking-out mechanism, then insert the connecting column 11 into the first shaft hole 103 and the second shaft hole 123 at the same time. At this time, the assembly of the entire production jig 1 is completed. When the card teeth 121 are completely received in the card slot 104, it is the initial state of the production jig. When the control rod 120 is pressed down, the taking-out mechanism 12 can rotate around the connecting column 13. The gap between the chamfered corner 122 and the first step 105 provides space for the rotation of the taking-out mechanism 12, and then a row of rotor assemblies 14 located on the rotor positioning unit 11 can be ejected from the production jig 1.

[0041] See Figure 6 , Figure 6 which is the rotor assembly 14 of a flat vibration motor. The rotor assembly 14 includes three components: a coil 141, a vibrator 140, and a PCB 142. The coils 141 are symmetrically and spaced apart in a figure-eight shape on both sides of the bearing hole 143, and the vibrator 140 is located on the side where the two coils are closer to each other.

[0042] During the production process of the rotor assembly of the flat vibration motor, it is realized through the following production method.

[0043] First, on the production jig 1 in the initial state, the coil 141 is sleeved on the coil positioning boss 111, and the vibrator 140 is placed in the vibrator positioning groove 112. The coil positioning boss 111 and the vibrator positioning groove 112 ensure the accurate positioning of the coil 141 and the vibrator 140.

[0044] Next, glue is applied to the opposite surfaces of the coil 141 and the vibrator 140 in contact with the base. The specific glue application positions of the coil 141 are the two ends of the minor axis of the ellipse of the coil 141, and the specific glue application position of the vibrator 140 is the area near the center of its sector.

[0045] Then, a catalyst is coated on the PCB 142. The main function of the catalyst is to accelerate the curing of the glue and save the production time of the rotor assembly 14.

[0046] Immediately afterwards, through the PCB positioning post 110 corresponding to the shaft hole of the PCB, the PCB 142 coated with the catalyst is pressed down and covers the coil 141 and the vibrator 140. The three components are bonded together through the glue dots on the coil 141 and the vibrator 140 to form an integrated rotor assembly 14. The production jig 1 together with the bonded rotor assembly 14 is sent into a hot melt box for hot pressing. Under the dual action of the catalyst and heating, the coil 141 and the vibrator 140 can be bonded to the PCB 142 more quickly and firmly. The function of hot pressing ensures the bonding strength between the three components of the coil 141, the vibrator 140, and the PCB 142, and prevents relative displacement or detachment between the coil 141, the vibrator 140, and the PCB 142 during the subsequent production process or use.

[0047] Then, the wire ends of the coil 141 are welded by electric welding to ensure that the subsequent motor can be powered on. After the wire end welding is completed, an on-off detection needs to be carried out in a timely manner to ensure good electrical conductivity of the rotor 14. After the on-off detection, glue is applied to the wire ends and then dried. The purpose is to strengthen the fixing of the wire ends of the coil 141 and prevent the phenomenon of wire end detachment and power failure in the subsequent process.

[0048] After the wire ends of the coil 141 are fixed by dispensing glue, the components of the PCB 142, the coil 141 and the vibrator 140 are cleaned together to remove impurities.

[0049] At this time, the PCB is strip-shaped. A number of coils 141 and vibrators 140 are respectively fixed at the corresponding pattern positions on the PCB 142 through the production fixture 1 to form a number of rotor component groups. The main function of the PCB positioning posts 110 is to fix the rotor components 14 and ensure that the overall rotor component group does not shift or misalign during the production processes of bonding, hot pressing, welding and cleaning. The rotor component group is positioned above the base 10 and the take-out mechanism 12 throughout the production process. After the cleaning of the rotor component group is completed, the control rod 120 of the production fixture 1 is mechanically pressed downwards. The locking teeth 121 rotate upwards around the connecting column 13 and push the PCB strip above the locking teeth away from the PCB positioning posts 110, thereby ejecting the entire rotor component 14 from the production fixture. After releasing the pressed control rod, the locking teeth of the take-out mechanism fall into the card slots under the action of gravity, and the production fixture returns to its initial state. The rotor components are mass-produced automatically throughout the entire assembly and production process, reducing labor costs.

[0050] In the whole process of placing, bonding, hot pressing, welding and cleaning of the various components of the above rotor component, the production is fully automated. The production fixture 1 is in its initial state, and the locking teeth 121 of the take-out mechanism 12 are completely received in the card slots 104 of the base 10, ensuring that the upper surface of the production fixture 1 is on the same horizontal plane and preventing the entire rotor component group from tilting or shaking during the production process due to the protrusion of the locking teeth 121, thus ensuring the production quality of the product.

[0051] After taking out the number of rotor component groups connected by the PCB strip, they are cut into single rotor components according to the set dimensions. After cutting the PCB strip, the rotor component 14 is placed in an injection mold, and at the same time, bearings are placed, and then injection molding is carried out. After the injection molding is completed, the appearance of the rotor is inspected to ensure good appearance quality. At this time, the production of the rotor is completed.

[0052] Embodiment 2

[0053] This embodiment is another preferred solution further optimized on the basis of the rotor component 14 of Embodiment 1. The technical solutions disclosed in Embodiment 1 other than the distinguishing technical features belong to the scope disclosed in this embodiment, and the technical solutions disclosed in Embodiment 1 other than the distinguishing technical features will not be described repeatedly.

[0054] Refer to Figure 5, the production fixture base 10 is provided with a reset unit. The reset unit uses a reset magnet 15. There are preferably three installation methods for the reset magnet 15. One is to set a through hole parallel to the connecting column from the side of the base and below the card slot, and the reset magnet 15 is inserted into the through hole and extends below each card slot. The second is to set grooves at least at the inner bottom of the card slots 104 at both ends of the base 10, and embed the reset unit in the grooves to reduce the usage amount of the reset magnet 15 and save costs. The third is to set at least two grooves at the side of the card slots at both ends, extend the grooves below the card slot 104, and embed the reset magnet 15 to reduce the processing difficulty of the grooves and the insertion difficulty of the magnet. The reset magnet 15 is generally set as a polygonal bar, a cylinder or a conical shape that is easy to install. The magnetic force of the reset magnet 15 generates an attraction force to attract the tooth 121 of the extraction mechanism 12. When the control rod 120 is pressed down, the extraction mechanism 12 rotates upward around the connecting column 13, and the tooth 121 tilts up. When the pressing is released, the reset magnet 15 sucks the tooth 121 into the card slot through its attraction force, so that the production fixture 1 returns to the initial state.

[0055] According to Embodiment 2, the reset unit uses a reset spring (not shown). The reset spring is spiral. The two ends of the reset spring are respectively hung on the hook of the production fixture base 10 and the hook of the extraction mechanism 12. When the control rod 120 is pressed down, the extraction mechanism 12 rotates upward around the connecting column 13, causing the reset spring to stretch and deform. After stopping pressing down, the stretched and deformed reset spring (not shown) pulls the tooth 121 of the extraction mechanism back into the card slot of the base through its own contraction force, so that the production fixture 1 returns to the initial state.

[0056] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A production jig for a rotor assembly, comprising a base, a taking-out mechanism and a connecting column. A plurality of rotor positioning units are evenly arranged on the upper end surface of the base, and adjacent rotor positioning units are spaced apart by a card slot. The taking-out mechanism is provided with a control rod and a plurality of teeth connected by the control rod. The base and the taking-out mechanism are respectively provided with a first shaft hole and a second shaft hole. The base and the taking-out mechanism are hinged and fixed by passing the connecting column through the first shaft hole and the second shaft hole. The taking-out mechanism can rotate around the connecting column, and is characterized in that, The rotor positioning unit is provided with PCB positioning posts, coil positioning bosses and oscillator positioning grooves; the number of the engaging teeth is the same as the number of the engaging slots, the height of the engaging teeth is less than or equal to the depth of the engaging slots, and the width of the engaging teeth is the same as the width of the engaging slots.

2. The production jig for a rotor assembly according to claim 1, wherein, The base is provided with a reset unit.

3. The production fixture for a rotor assembly according to claim 1, characterized in that, The several rotor positioning units are provided with at least two PCB positioning posts. Each rotor positioning unit is provided with two coil positioning bosses and one oscillator positioning groove. The two coil positioning bosses are symmetrically spaced in a V shape, and the oscillator positioning groove is located on the side close to the control rod.

4. The production jig for a rotor assembly according to claim 1, wherein, The engaging teeth are provided with chamfers, and the control rod is connected to the side of the chamfer.

5. The production jig for a rotor assembly according to claim 1, wherein, The base is provided with a first step and a second step, and the first step is adjacent to the upper side of the second step.

6. The production jig for a rotor assembly according to claim 5, characterized in that, The bottom surface of the first step is a horizontal plane, and the surface of the second step is an inclined plane.

7. The production jig for a rotor assembly according to claim 1, characterized in that, The engaging teeth are placed in the engaging slots, and the control rod is located above the first step.

8. The production fixture for a rotor assembly according to claim 7, characterized in that, The upper surface of the engaging teeth is lower than or flush with the upper surface of the base.

9. A production method of a rotor assembly, characterized in that, Using the production jig for a rotor assembly according to any one of claims 1-8, its production method includes the following steps: Place the production jig in the initial state. Sheath the coil and the oscillator on the coil positioning bosses and the oscillator positioning grooves of the rotor positioning unit respectively. Apply glue on the opposite side of the contact surfaces of the coil and the oscillator with the base. Press the PCB onto the coil and the oscillator through the PCB positioning posts, and bond and fix the PCB, the coil and the oscillator through the glue application. Thermally press and strengthen the PCB, the coil and the oscillator to form an integral rotor assembly. Press the control rod, the extraction mechanism rotates along the connecting column, the engaging teeth tilt up from the engaging slots, and the engaging teeth push the rotor assembly upward to disengage from the rotor positioning unit, so as to take out the rotor assembly from the production jig.

10. A production method of a rotor assembly according to claim 9, characterized in that, Release the pressed control rod, and the extraction mechanism restores the production jig to the initial state through the reset unit provided on the base.

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