Welding positioning device for lead of rotary transformer

Abstract

The utility model provides a welding and positioning device for a lead of a rotary transformer. The welding and positioning device comprises a framework positioning unit and a lead positioning unit, wherein the framework positioning unit is provided with a welding seat, a disc and a pushing block; a welding groove is formed in the welding seat, the disc is located in front of the welding seat and used for sleeving a stator framework, the pushing block is arranged in front of the disc in a front-back moving mode, and when the pushing block moves backwards, the pushing block can push the stator framework sleeving the disc, so that the inner wall face of the stator framework makes linear contact with the outer wall face of the disc, and the connector is inserted into and abuts against the welding groove. A lead groove is formed in the top face of the lead block, the pressing plate is detachably attached to the lead block and used for pressing a lead in the lead groove, the positioning column is located behind the welding base, the outer diameter of the positioning column is matched with the inner diameter of a blind hole in the bottom face of the lead block, when the positioning column is inserted into the blind hole, the height of the lead groove is matched with a bonding pad, and positioning of the stator framework and the lead can be achieved before welding. And during welding, time and labor are saved, the consistency is good, and the yield is high.

Description

Technical Field

[0001] The utility model relates to the technical field of resolver processing and manufacturing, in particular to a lead welding positioning device for a resolver. Background Art

[0002] A resolver is an electromagnetic sensor, also known as a synchro resolver, which is a small AC motor used to measure the angular displacement and angular velocity of the rotating shaft of a rotating object. It consists of a stator and a rotor. The stator includes an annular stator skeleton, a stator core wrapped inside the stator skeleton, and a stator winding wound around the stator skeleton. To facilitate the connection of the stator winding, a connector for conveniently connecting the end of the stator winding is usually provided on the existing stator skeleton. However, most of these connectors cannot be directly connected to external devices and need to be welded with leads on the pads of the connector by an ultrasonic welding machine before they can be connected to external devices through the leads.

[0003] Most of the existing lead welding methods are manual hand-held welding. That is, an employee holds the stator winding with one hand, places the pad of the connector on the bottom die of the ultrasonic welding machine, holds the lead with the other hand, moves the end of the lead above the pad and makes it fit with the pad, and then steps on the foot pedal switch to make the welding head of the ultrasonic welding machine move downward driven by the driving cylinder, pressing the end of the lead and the pad of the connector on the bottom film. Then, the ultrasonic transducer makes the welding head generate ultra-high-frequency vibration, so that the end of the lead and the pad of the connector are welded together to achieve lead welding. However, due to the instability of the hand-held parts, misalignment is likely to occur during welding, resulting in defects such as false soldering and poor welding firmness, which is time-consuming and laborious, with poor consistency and low yield. Moreover, when aligning the end of the lead by hand, it is also easy to have the phenomenon that the feeding length of the end of the lead does not meet the requirements. If the feeding length is too short, the tensile effect after welding is not good. If the feeding length is too long, the excessive end remains at the pad, which is likely to cause local short circuit and is difficult to adapt to mass production operations. Summary of the Utility Model

[0004] The purpose of the utility model is to overcome one or more defects in the prior art and provide a lead welding positioning device for a resolver.

[0005] To achieve the above purpose, the technical solution adopted by the utility model is that the lead welding positioning device for a resolver includes a skeleton positioning unit and a lead positioning unit. The skeleton positioning unit includes a welding seat, a disc, and a pushing block. The lead positioning unit includes a lead block, a pressing plate, and a positioning column.

[0006] The upper surface of the welding seat is provided with a welding groove which penetrates the welding seat in the front-back direction. The groove width of the welding groove in the left-right direction matches the width of the connector on the stator skeleton. The disc is used for sleeving the stator skeleton and is located in front of the welding seat. The outer diameter of the disc is 85% to 95% of the inner diameter of the stator skeleton. The pushing block is movably arranged in front of the disc. When the pushing block moves backward, it can push the stator skeleton sleeved on the disc backward, so that the inner wall surface of the stator skeleton is in line contact with the outer wall surface of the disc, and the connector is inserted into and abutted against the welding groove.

[0007] The top surface of the lead block is provided with a plurality of lead grooves for accommodating leads. The plurality of lead grooves correspond to a plurality of pads on the connector one by one. The groove depth of the lead groove is 95% to 98% of the lead diameter. The lead groove penetrates the lead block in the front-back direction. The width of the pressing plate in the left-right direction is greater than or equal to the width of the lead block in the left-right direction. The pressing plate is detachably attached to the lead block. The positioning post is located behind the welding seat. The outer diameter of the positioning post matches the inner diameter of the blind hole on the bottom surface of the lead block. The distance between the positioning post and the welding seat in the front-back direction is equal to the shortest distance between the blind hole and the front surface of the lead block. When the positioning post is inserted into the blind hole, the height of the lead groove matches the height of the pad. At the same time, the front surface of the lead block is in contact with the rear surface of the welding seat, so that the lead groove is aligned with the pad.

[0008] Preferably, the rear end face of the welding seat is provided with a docking groove extending forward. The groove width of the docking groove matches the width of the lead block in the left-right direction. When the positioning post is inserted into the blind hole, the front end of the lead block is inserted into the docking groove.

[0009] Preferably, the bottom wall of the welding groove is provided with a plurality of bottom dies protruding upward. The plurality of bottom dies correspond to a plurality of pads one by one. When the connector is inserted into and abutted against the welding groove, the bottom die is located below the pad and is in contact with the bottom surface of the pad.

[0010] Preferably, the virtual plane where the axis line of the disc and the axis line of the positioning post are located divides the welding groove equally in the left-right direction. The blind hole is located at the center of the bottom surface of the lead block.

[0011] Preferably, the side surface of the pushing block facing the disc is an arc surface which matches the outer wall surface of the stator skeleton. The radian of the arc surface is 135° to 150°.

[0012] Preferably, the upper surface of the lead block is embedded with a first magnetic column for attracting the pressing plate. The upper end surface of the first magnetic column is flush with the upper surface of the lead block. There are two first magnetic columns, and these two first magnetic columns are respectively arranged near the left and right side surfaces of the lead block. All the lead grooves are located between these two first magnetic columns.

[0013] Further preferably, a positioning notch is provided on the left side surface and / or the right side surface of the lead block, and a positioning plug inserted is vertically connected to the lower surface of the pressing plate and is matched with the positioning notch. When the pressing plate is attracted to the lead block by the first magnetic column, the positioning plug is inserted into the positioning notch.

[0014] Further preferably, the lead groove is divided into a front groove and a rear groove of equal length in the front-rear direction. The groove width of the front groove gradually increases forward, the groove width of the rear groove remains unchanged, and the first magnetic column is arranged corresponding to the rear groove.

[0015] Preferably, a magnetic ring is embedded in the upper end surface of the positioning column. The upper surface of the magnetic ring is flush with the upper end surface of the positioning column, and the magnetic ring is used for attracting the lead block.

[0016] Preferably, the lead positioning unit further includes a leveling block. The leveling block is located on the right side of the welding seat. A step recessed downward is provided at the rear part of the upper surface of the leveling block. A leveling groove recessed downward is formed in the middle of the bottom surface of the step. The leveling groove penetrates through the rear surface of the leveling block backward. The groove width of the leveling groove is not less than the maximum distance between the groove walls of all the lead grooves on the lead block. A second magnetic column for attracting the front surface of the lead block is embedded in the rear surface of the leveling block, and the rear surface of the second magnetic column is flush with the rear surface of the leveling block.

[0017] Due to the application of the above technical solution, the present utility model has the following advantages compared with the prior art:

[0018] The rotary transformer lead wire welding positioning device provided by the utility model includes a skeleton positioning unit with a welding seat, a disc, and a pushing block, and a lead wire positioning unit with a lead wire block, a pressing plate, and a positioning column; a welding groove is provided on the welding seat, the disc is located in front of the welding seat for sleeving the stator skeleton, the pushing block is movably arranged in front of the disc, when the pushing block moves backward, it can push the stator skeleton sleeved on the disc, so that the inner wall surface of the stator skeleton is in line contact with the outer wall surface of the disc, and the connector is inserted and abutted against the welding groove; a lead wire groove is opened on the top surface of the lead wire block, the pressing plate is detachably attached to the lead wire block for pressing the lead wire in the lead wire groove, the positioning column is located behind the welding seat, and its outer diameter matches the inner diameter of the blind hole at the bottom of the lead wire block. When the positioning column is inserted into the blind hole, the height of the lead wire groove matches the welding pad, which can realize the positioning of the stator skeleton and the lead wire before welding, without manual operation, saving time and effort during welding, with good consistency and high yield rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a top view schematic diagram of a preferred embodiment of the present utility model. At this time, the stator skeleton and the pressing plate are not installed, and the lead wire is hidden.

[0020] Figure 2 is Figure 1 a schematic diagram after installing the stator skeleton and the pressing plate. At this time, the lead wire block is in contact with the leveling block.

[0021] Figure 3 is Figure 2 a schematic diagram of the lead wire block in contact with the welding seat in . At this time, the stator skeleton has been positioned.

[0022] Figure 4 is Figure 2 a three-dimensional enlarged schematic diagram of the lead wire block in .

[0023] Figure 5 is Figure 2 a three-dimensional enlarged schematic diagram of the leveling block in .

[0024] Figure 6 、 Figure 7 is Figure 2 a three-dimensional enlarged schematic diagram of the lead wire block in .

[0025] Figure 8 is Figure 2 a three-dimensional enlarged schematic diagram of the pressing plate in .

[0026] Wherein: 1. Stator skeleton; 2. Connector; 3. Pad; 11. Welding seat; 111. Welding groove; 112. Docking groove; 113. Bottom mold; 12. Disc; 13. Thrust block; 131. Arc surface; 14. Driving cylinder; 21. Lead block; 211. Lead groove; 212. Blind hole; 213. First magnetic column; 214. Positioning notch; 215. Front groove; 216. Rear groove; 22. Pressure plate; 221. Positioning insertion plate; 23. Positioning column; 231. Magnetic ring; 24. Flattening block; 241. Step; 242. Flattening groove; 243. Second magnetic column. Detailed implementation manner

[0027] The front-back direction described in the present utility model is Figure 1 the left-right direction in Figure 1 and the left-right direction described in the present utility model is

[0028] Such as Figures 1 to 8As shown in the figure, the resolver lead wire welding positioning device provided by the utility model includes a skeleton positioning unit and a lead wire positioning unit. The skeleton positioning unit includes a welding seat 11, a disc 12, a pushing block 13, and a driving cylinder 14. Among them, a welding groove 111 is provided on the upper surface of the welding seat 11. The welding groove 111 penetrates the welding seat 11 in the front-rear direction. The groove width of the welding groove 111 in the left-right direction matches the width of the connector 2 on the stator skeleton 1. The disc 12 is used to sleeved the stator skeleton 1. The disc 12 is located in front of the welding seat 11. The outer diameter of the disc 12 is 85% to 95% of the inner diameter of the stator skeleton 1. The pushing block 13 is arranged in front of the disc 12 and can move back and forth. When the pushing block 13 moves backward, it can push the stator skeleton 1 sleeved on the disc 12 backward, so that the inner wall surface of the stator skeleton 1 is in line contact with the outer wall surface of the disc 12, and the connector 2 is inserted into and abutted against the welding groove 111. The driving cylinder 14 is arranged in front of the pushing block 13. The end of the cylinder rod of the driving cylinder 14 is connected to the front end surface of the pushing block 13. The driving cylinder 14 is used to drive the pushing block 13 to move back and forth. The lead wire positioning unit includes a lead wire block 21, a pressing plate 22, and a positioning column 23. Among them, a plurality of lead wire grooves 211 for accommodating lead wires are provided on the top surface of the lead wire block 21. The plurality of lead wire grooves 211 correspond to the plurality of pads 3 on the connector 2 one by one. The groove depth of the lead wire grooves 211 is 95% to 98% of the diameter of the lead wire. The lead wire grooves 211 penetrate the lead wire block 21 in the front-rear direction. The width of the pressing plate 22 in the left-right direction is greater than the width of the lead wire block 21 in the left-right direction. The pressing plate 22 is detachably attached to the lead wire block 21. When the pressing plate 22 is attached to the lead wire block 21, the pressing plate 22 can press the lead wires in all the lead wire grooves 211. The positioning column 23 is located behind the welding seat 11. The outer diameter of the positioning column 23 matches the inner diameter of the blind hole 212 at the center of the bottom surface of the lead wire block 21. The distance between the positioning column 23 and the welding seat 11 in the front-rear direction is equal to the shortest distance between the blind hole 212 and the front surface of the lead wire block 21. When the positioning column 23 is inserted into the blind hole 212, the height of the lead wire groove 211 matches the height of the pad 3. At the same time, the front surface of the lead wire block 21 is attached to the rear surface of the welding seat 11, so that the lead wire groove 211 is aligned with the pad 3.

[0029] The advantage of such a setting is that it is not necessary to hold the work by hand, and the positioning of the stator skeleton and the lead wires can be achieved before welding. During welding, it saves time and effort, has good consistency, and a high yield rate, and is suitable for batch production.

[0030] In this embodiment, to ensure that the front surface of the lead wire block 21 can be perfectly attached to the rear surface of the welding seat 11 when the positioning column 23 is inserted into the blind hole 212, further, a docking groove 112 extending forward is provided on the rear end surface of the welding seat 11. The groove width of the docking groove 112 matches the width of the lead wire block 21 in the left-right direction. When the positioning column 23 is inserted into the blind hole 212, the front end of the lead wire block 21 is inserted into the docking groove 112.

[0031] For the convenience of ultrasonic welding, in this embodiment, a plurality of upwardly protruding bottom dies 113 are provided on the bottom wall of the welding groove 11. The plurality of bottom dies 113 correspond to the plurality of pads 3 one by one. When the connector 2 is inserted into and abuts against the welding groove 11, the bottom die 113 is located below the pad 3 and fits against the bottom surface of the pad 3.

[0032] In this embodiment, the virtual plane where the axis line of the disc 12 and the axis line of the positioning post 23 are located divides the welding groove 11 evenly in the left-right direction. The side surface of the pushing block 13 facing the disc 12 is an arc surface 131. The arc surface 131 matches the outer wall surface of the stator skeleton 1. The radian of the arc surface 131 is 135° to 150°. At the same time, the center of the arc surface 131 is located in this virtual plane to ensure the pushing effect.

[0033] For the convenience of the pressing plate 22 to fit, in this embodiment, a first magnetic column 213 for attracting the pressing plate 22 is embedded on the upper surface of the lead block 21. The upper end surface of the first magnetic column 213 is flush with the upper surface of the lead block 21. There are two first magnetic columns 213, and these two first magnetic columns 213 are respectively arranged close to the left and right side surfaces of the lead block 21. All the lead grooves 211 are located between these two first magnetic columns 213. For the convenience of positioning the pressing plate 22, further, positioning notches 214 are provided on both the left and right side surfaces of the lead block 21. A positioning plug 221 that matches the positioning notch 214 is vertically connected to the lower surface of the pressing plate 22. When the pressing plate 22 is attracted to the lead block 21 by the first magnetic column 213, the positioning plug 221 is inserted into the positioning notch 214. For the convenience of operation, there is only one positioning plug 221.

[0034] For the convenience of aligning the end of the lead with the pad 3, in this embodiment, the lead groove 211 is divided into an equal-length front groove 215 and a rear groove 216 in the front-rear direction. The groove width of the front groove 215 gradually increases forward, and the maximum groove width of the front groove 215 is not greater than 1.5 times the lead wire diameter. The groove width of the rear groove 216 remains unchanged in the front-rear direction, and the first magnetic column 213 is arranged corresponding to the rear groove 216.

[0035] To prevent displacement in the up-down direction between the lead block 21 and the positioning post 23 after the positioning post 23 is inserted into the blind hole 212, further, a magnetic ring 231 is embedded on the upper end surface of the positioning post 23. The upper surface of the magnetic ring 231 is flush with the upper end surface of the positioning post 23, and the magnetic ring 231 is used to attract the lead block 21.

[0036] For the convenience of making the end of the lead flat, in this embodiment, the lead positioning unit further includes a flattening block 24. The flattening block 24 is located on the right side of the welding base 11. The width of the flattening block 24 in the front-back direction is equal to the width of the lead block 21 in the front-back direction. A step 241 that is recessed downward is provided at the rear part of the upper surface of the flattening block 24. A flattening groove 242 is formed by the middle part of the bottom surface of the step 241 being recessed downward. The flattening groove 242 penetrates through the rear surface of the flattening block 24 backward. The groove width of the flattening groove 242 is not less than the maximum distance between the groove walls of all the lead grooves 211 on the lead block 21. A second magnetic post 243 for attracting the front surface of the lead block 21 is also embedded in the rear surface of the flattening block 24. The rear surface of the second magnetic post 243 is flush with the rear surface of the flattening block 24.

[0037] After the lead is placed in the lead groove 211, first, the lead block 21 is attracted to the flattening block 24, then the end faces of the lead block 21 and the flattening block 24 are made flush in the left-right direction, and then the lead is pushed forward so that the rear end of the lead is flattened against the front groove wall of the flattening groove 242. After flattening, the pressing plate 22 is attracted to the lead block 21 to press the lead in the lead groove 211. Then, the lead block 21 is picked up and sleeved on the positioning post 23, and its front end is inserted into the docking groove 112, and its front surface is attached to the front surface of the welding base 11 to complete the lead positioning before welding.

[0038] It should be noted that in this embodiment, to improve the welding efficiency, two sets of lead blocks 21 and pressing plates 22 can be provided. When one set is attached to the welding base 11 for welding operations, the other set can be attached to the flattening block 24 to align the lead ends.

[0039] The above embodiments are only used to illustrate the technical concept and characteristics of the present invention. The purpose is to enable those skilled in the art to understand the content of the present invention and implement it accordingly. It cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.

Claims

1. A rotary transformer lead welding positioning device, comprising a skeleton positioning unit and a lead positioning unit, wherein the skeleton positioning unit comprises a welding seat, a disc, and a push block, and the lead positioning unit comprises a lead block, a pressure plate, and a positioning column; Features: The upper surface of the welding seat is provided with a welding groove, and the welding groove penetrates the welding seat in the front-to-back direction. The groove width of the welding groove in the left-to-right direction matches the width of the connector on the stator frame. The disc is used to fit the stator frame. The disc is located in front of the welding seat. The outer diameter of the disc is 85% to 95% of the inner diameter of the stator frame. The push block is arranged in front of the disc so as to be movable forward and backward. When the push block moves backward, it can push the stator frame fitted on the disc backward so that its inner wall surface is in line contact with the outer wall surface of the disc, so that the connector is inserted into and pressed against the welding groove; The top surface of the lead block is provided with a plurality of lead grooves for accommodating the lead wires, the plurality of lead grooves correspond one to one with the plurality of solder pads on the connector, the groove depth of the lead groove is 95% to 98% of the diameter of the lead wire, the lead groove penetrates the lead block in the front-to-back direction, the width of the pressing plate in the left-to-right direction is greater than or equal to the width of the lead block in the left-to-right direction, the pressing plate is detachably attached to the lead block, the positioning column is located behind the soldering seat, the outer diameter of the positioning column matches the inner diameter of the blind hole on the bottom surface of the lead block, the spacing between the positioning column and the soldering seat in the front-to-back direction is equal to the shortest spacing between the blind hole and the front surface of the lead block, when the positioning column is inserted into the blind hole, the height of the lead groove matches the height of the solder pad, and at the same time, the front surface of the lead block is attached to the rear surface of the soldering seat so that the lead groove is aligned with the solder pad.

2. The rotary transformer lead welding positioning device according to claim 1, characterized in that: The rear end face of the welding seat is provided with a docking groove extending forward, the groove width of the docking groove matches the width of the lead block in the left and right directions, and when the positioning column is inserted into the blind hole, the front end of the lead block is inserted into the docking groove.

3. The rotary transformer lead welding positioning device according to claim 1, characterized in that: The bottom wall of the welding groove is provided with a plurality of bottom molds protruding upwards, and the plurality of bottom molds correspond one by one to the plurality of welding pads. When the connector is inserted into and pressed against the welding groove, the bottom molds are located below the welding pads and fit against the bottom surfaces of the welding pads.

4. The rotary transformer lead welding positioning device according to claim 1, characterized in that: The virtual plane where the axis line of the disk and the axis line of the positioning column are located divides the welding groove equally in the left and right directions, and the blind hole is located at the center of the bottom surface of the lead block.

5. The rotary transformer lead welding positioning device according to claim 1, characterized in that: The side surface of the push block facing the disc is a curved surface, the curved surface matches the outer wall surface of the stator frame, and the curvature of the curved surface is 135° to 150°.

6. The rotary transformer lead welding positioning device according to claim 1, characterized in that: A first magnetic column for attracting the pressure plate is embedded in the upper surface of the lead block, and the upper end surface of the first magnetic column is flush with the upper surface of the lead block. There are two first magnetic columns, which are respectively arranged close to the left and right sides of the lead block, and all the lead grooves are located between the two first magnetic columns.

7. The rotary transformer lead welding positioning device according to claim 6, characterized in that: The left side and / or right side of the lead block is provided with a positioning notch, and the lower surface of the pressure plate is vertically connected with a positioning plug plate matching the positioning notch. When the pressure plate is attracted to the lead block through the first magnetic column, the positioning plug plate is inserted into the positioning notch.

8. The rotary transformer lead welding positioning device according to claim 6, characterized in that: The lead slot is divided into a front slot and a rear slot of equal length in the front-to-back direction. The slot width of the front slot gradually increases forward, while the slot width of the rear slot remains unchanged. The first magnetic column is arranged corresponding to the rear slot.

9. The rotary transformer lead welding positioning device according to claim 1, characterized in that: A magnetic ring is embedded in the upper end surface of the positioning column, the upper surface of the magnetic ring is flush with the upper end surface of the positioning column, and the magnetic ring is used to attract the lead block.

10. The rotary transformer lead welding positioning device according to claim 1, characterized in that: The lead positioning unit also includes a leveling block, which is located on the right side of the welding seat. A downwardly concave step is provided on the rear part of the upper surface of the leveling block, and the middle part of the bottom surface of the step is concave downward to form a leveling groove. The leveling groove penetrates the rear surface of the leveling block backward, and the groove width of the leveling groove is not less than the farthest distance between the groove walls of all the lead grooves on the lead block. A second magnetic column for attracting the front surface of the lead block is embedded on the rear surface of the leveling block, and the rear surface of the second magnetic column is flush with the rear surface of the leveling block.

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