Auxiliary tool for stator core terminal butt welding and using method

Abstract

This invention discloses an auxiliary tooling and method for spot welding stator core terminals. The auxiliary tooling includes a connecting seat assembly, a rotating assembly, and a positioning assembly. The connecting seat assembly is connected to the spot welding device. The rotating assembly includes a mounting plate, a bearing seat, a positioning shaft, and a drive structure. The mounting plate is disposed on the top surface of the connecting seat assembly, and the bearing seat is disposed on the mounting plate. One end of the positioning shaft is connected to the bearing seat, and the other end is connected to the stator core. The positioning assembly includes a positioning seat and a positioning ball structure. The positioning seat is disposed on the mounting plate and located below the positioning shaft. The positioning seat has a mounting groove, and the positioning ball structure is embedded in the mounting groove. A return spring is disposed between the positioning ball structure and the mounting groove. The positioning shaft has multiple positioning grooves arranged parallel to each other on its circumferential side, and the positioning ball structure contacts one of the positioning grooves. This invention has the advantages of accurate positioning and strong operability, ensuring the consistency of spot welding quality and effectively improving production efficiency.

Description

Technical Field

[0001] This invention belongs to the technical field of auxiliary welding devices, specifically relating to an auxiliary tooling and method for spot welding of stator core terminals. Background Technology

[0002] The external rotor structure of a backward centrifugal fan is an essential component in the ventilation industry. Currently, external rotor AC fans are increasingly widely used, and the quality of the stator core terminal spot welding directly affects the overall quality of the fan. Currently, stator core terminal spot welding is generally done manually by employees, often requiring coordination of hands and eyes. Errors in stator core terminal positioning compared to manual spot welding result in inconsistent welding quality and low work efficiency. Furthermore, after prolonged spot welding operations, the positioning error of the stator core terminals increases, leading to a decrease in yield and further increases in production costs. Therefore, it is necessary to propose auxiliary tooling to address these existing problems. Summary of the Invention

[0003] To address the aforementioned technical problems, the present invention aims to provide an auxiliary tooling and method for spot welding stator core terminals, which has the advantages of accurate positioning and strong operability, ensuring the consistency of spot welding quality and effectively improving production efficiency.

[0004] To achieve the above-mentioned objectives, the technical solution adopted by the present invention is as follows:

[0005] In a first aspect, the present invention provides an auxiliary tooling for stator core terminal spot welding, comprising a connecting seat assembly, a rotating assembly, and a positioning assembly. The connecting seat assembly is connected to a spot welding device. The rotating assembly includes a mounting plate, a bearing seat, a positioning shaft, and a drive structure. The mounting plate is disposed on the top surface of the connecting seat assembly. The bearing seat is disposed on the mounting plate. One end of the positioning shaft is rotatably connected to the bearing seat, and the other end of the positioning shaft is connected to the stator core. The positioning assembly includes a positioning seat and a positioning ball structure. The positioning seat is disposed on the mounting plate and located below the positioning shaft. The positioning seat has a mounting groove for mounting the positioning ball structure. The positioning ball structure is embedded in the mounting groove. A return spring is disposed between the positioning ball structure and the mounting groove. The positioning shaft has multiple positioning grooves arranged parallel to each other on its circumferential side. The positioning ball structure contacts one of the positioning grooves.

[0006] Preferably, the connecting seat assembly includes a base and a guide rail. The base is connected to the spot welding device, the guide rail is disposed on the top surface of the base, and positioning baffles are provided at both ends of the guide rail. The mounting plate of the rotating assembly is slidably connected to the guide rail.

[0007] More preferably, a strong magnet is provided on the side of the positioning baffle facing the mounting plate, and the mounting plate is made of ferrous material. The guide rail is divided into a front positioning point and a rear positioning point according to the position of the strong magnet. The front positioning point is close to the welding device and is the working point for welding the terminals. The rear positioning point is far away from the welding device and is the working point for replacing the stator core and adjusting the terminal position.

[0008] More preferably, a limiting member is provided on the side of the positioning baffle facing the mounting plate, the limiting member facing the mounting plate, and the limiting member is detachably connected to the positioning baffle. When the mounting plate approaches one of the positioning baffles, the length of the limiting member protruding from the positioning baffle is the minimum distance between the mounting plate and the positioning baffle. By changing the length of the limiting member at the previous positioning point, the position between the positioning core terminal and the welding point can be adjusted.

[0009] Preferably, the side of the end of the positioning shaft that connects to the stator core is provided with a mounting groove, and the mounting groove is adapted to the structure of the inner hole of the stator core.

[0010] Preferably, the drive structure is a motor or a rotary cylinder, and the drive part of the motor or the rotary cylinder is connected to the end of the positioning shaft, which helps to improve the automation level of the auxiliary device.

[0011] Preferably, the driving structure is a handle, the bottom end of which is fixedly connected to the circumferential side of the positioning shaft, and the handle and the positioning shaft are perpendicular to each other.

[0012] Preferably, the base includes a support frame and a fixed connecting plate, the top surface of the support frame is connected to the guide rail, the bottom side of the support frame is connected to the fixed connecting plate, and the fixed connecting plate is connected to a spot welding device.

[0013] Preferably, the base is further provided with a push cylinder, the piston rod of which is connected to the mounting plate to drive the rotating assembly to move along the guide rail.

[0014] In a second aspect, the present invention provides a method for using an auxiliary tooling for stator core terminal spot welding, comprising the following steps:

[0015] S1. The auxiliary tooling is fixedly connected to the spot welding device via the connecting seat assembly;

[0016] S2. Install the stator core on the end of the positioning shaft, so that the stator core terminals face the welding point of the spot welding device;

[0017] S3. Start the spot welding machine and spot weld the terminals of the stator core located at the welding point;

[0018] S4. The positioning shaft is rotated by the drive structure, so that the adjacent unsoldered terminals are rotated to the highest position.

[0019] S5. Restart the spot welding machine and spot weld the terminals of the stator core located at the welding point;

[0020] S6. Repeat steps S3-S5 until all terminals of the stator core are spot welded, then remove the stator core.

[0021] Beneficial effects:

[0022] This invention has a simple structure and is highly operable. No special training is required for operators. It is applicable to the spot welding of stator core terminals of different models of wind turbines and has a wide range of applications. The positioning of the stator core in the spot welding device and the adjustment of the stator core terminals are achieved by auxiliary devices, which have high positioning accuracy, improve the consistency of spot welding quality, and effectively improve production efficiency. Attached Figure Description

[0023] Figure 1 The figure shown is a three-dimensional schematic diagram of the connection between the present invention and the stator core;

[0024] Figure 2 The image shown is a three-dimensional schematic diagram of the present invention from another angle;

[0025] Figure 3 As shown Figure 1 A diagram from the front view;

[0026] Figure 4 The diagram shown is a cross-sectional view of the present invention;

[0027] Figure 5 The diagram shown is a schematic of the positioning shaft of the present invention.

[0028] Reference numerals: 1-Support frame, 2-Fixed connecting plate, 3-Guide rail, 4-Positioning baffle, 5-Strong magnet, 6-Limiting component, 7-Mounting plate, 8-Bearing seat, 9-Positioning shaft, 10-Handle, 11-Stator core, 12-Terminal, 13-Positioning seat, 14-Positioning ball structure, 15-Positioning groove, 16-Mounting slot. Detailed Implementation

[0029] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without any creative effort.

[0030] like Figure 1-5 As shown, this invention provides an auxiliary tooling for stator core terminal spot welding, providing accurate and standard positioning for welding stator core 11 terminals 12, reducing the labor intensity of workers, such as... Figure 1-4 As shown, the auxiliary tooling includes a connecting seat assembly, a rotating assembly, and a positioning assembly. The connecting seat assembly is connected to the spot welding device, positioning the entire auxiliary tooling close to the welding station of the spot welding device.

[0031] The rotating assembly includes a mounting plate 7, a bearing housing 8, a positioning shaft 9, and a drive structure. The mounting plate 7 is located on the top surface of the connecting seat assembly, and the bearing housing 8 is located on the mounting plate 7. It is easy to understand that a bearing is installed inside the bearing housing 8. The positioning shaft 9 passes through the bearing housing 8 and is connected to the bearing in the bearing housing 8. That is, the positioning shaft 9 and the bearing housing 8 are rotatably connected. The end of the positioning shaft 9 near the welding device is the mounting section of the stator core 11 terminal 12. The mounting end of the positioning shaft 9 is embedded in the inner hole of the stator core 11 to lock the stator core 11 on the auxiliary tooling. It is easy to understand that after the stator core 11 is connected to the positioning shaft 9, the stator core 11 and the positioning shaft 9 do not have relative displacement or relative rotation. The drive structure is connected to the positioning shaft 9 and drives the positioning shaft 9 to rotate, thereby changing the welding position of the stator core 11 terminal 12.

[0032] The positioning assembly includes a positioning seat 13 and a positioning ball structure 14, such as Figure 4 As shown, the positioning seat 13 is disposed on the mounting plate 7 and located directly below the positioning shaft 9. The positioning seat 13 is provided with a mounting groove for mounting the positioning ball structure 14. The positioning ball structure 14 is embedded in the mounting groove, and a return spring is provided between the positioning ball structure 14 and the mounting groove. The positioning shaft 9 is provided with multiple positioning grooves 15 that cooperate with the positioning ball structure 14 on its circumferential side. The number and position of the positioning grooves 15 correspond to the number and position of the stator core 11 terminals 12. The positioning grooves 15 are distributed along the axial direction of the positioning shaft 9, and the positioning ball structure 14 contacts one of the positioning grooves 15.

[0033] The positioning component restricts the rotation of the positioning shaft 9. Under the action of the return spring, the positioning ball structure 14 is inserted upward into one of the positioning grooves 15 of the positioning shaft 9. During the spot welding process, the positioning ball structure 14 plays a locking and positioning role, ensuring that the positioning shaft 9 will not rotate. When it is necessary to adjust the spot welding position, the drive structure drives the positioning shaft 9 to rotate, the return spring is compressed, and the ball at the top of the positioning ball structure 14 rolls along the positioning shaft 9 to the next positioning groove 15.

[0034] The mounting section of the positioning shaft 9 is equipped with a mounting slot 16, such as... Figure 1 As shown, the mounting section of the positioning shaft 9 is embedded in the inner hole of the stator core 11, and the mounting slot 16 is structurally adapted to the inner hole of the stator core 11 to achieve locking and positioning of the stator core 11 on the stator shaft.

[0035] It is easy to understand that the positioning shaft 9 and the bearing seat 8 of the present invention are detachably connected. When the type or specification of the stator core 11 is changed, the original positioning shaft 9 needs to be removed and replaced with a positioning shaft 9 that conforms to the specifications of the new stator core 11.

[0036] Based on the above structure, the present invention also proposes a method for using the auxiliary tooling, the specific steps of which are as follows:

[0037] S1. The auxiliary tooling is fixedly connected to the spot welding device via the connecting seat assembly;

[0038] S2. Install the stator core 11 on the end of the positioning shaft 9, so that the stator core 11 terminal 12 faces the welding point of the welding device;

[0039] S3. Start the spot welding machine and spot weld the terminals 12 of the stator core 11 located at the welding point;

[0040] S4. The positioning shaft 9 is rotated by the drive structure, so that the adjacent unwelded terminals 12 are rotated to the highest position.

[0041] S5. Restart the spot welding machine and spot weld the terminals 12 of the stator core 11 located at the welding point;

[0042] S6. Repeat steps S3-S5 until all terminals 12 of the stator core 11 are spot welded, then remove the stator core 11.

[0043] In this invention, the drive structure can be varied. The drive structure can be an automatic device, such as a motor or a rotary cylinder. The drive part of the motor or rotary cylinder is connected to the end of the positioning shaft 9 to drive the positioning shaft 9 to rotate. Alternatively, the drive structure can also be a manually controlled structure to simplify the overall structure of the auxiliary tooling.

[0044] Preferably, the driving structure of the present invention is a manually controlled structure, and the driving structure is a handle 10. The bottom end of the handle 10 is fixedly connected to the circumferential side of the positioning rotating shaft 9, such as... Figure 1-4 As shown, the handle 10 and the positioning shaft 9 are perpendicular to each other. The operator rotates the positioning shaft 9 by holding the handle 10 and moving it circumferentially. In addition, the handle 10 also serves as an indicator. During the spot welding operation, the stator core 11 needs to be rotated multiple times to spot weld the terminals 12 at different positions. The degree of tilt of the handle 10 can be used to visually determine the spot welding position of the stator core 11 terminals 12.

[0045] Furthermore, the connecting seat assembly includes a base and a guide rail 3. The base is connected to the spot welding device, and the guide rail 3 is set on the top surface of the base. Positioning baffles 4 are provided at both ends of the guide rail 3. The mounting plate 7 of the rotating component is slidably connected to the guide rail 3. That is, the position of the rotating component as a whole on the connecting seat can be adjusted. It is easy to understand that during spot welding, the rotating component as a whole needs to move to a position close to the spot welding device. After completing the spot welding at the first position, the rotating component moves along the guide rail 3 to a position away from the spot welding device. Then, the positioning shaft 9 is rotated to rotate the next position to be spot welded to the highest position. Then, the rotating component is brought close to the spot welding device again. During this process, when the driving structure is a handle 10, the operator can hold the handle 10 to push the rotating component as a whole.

[0046] With the rotating component able to move along guide rail 3, the method of using the auxiliary tooling has also been improved accordingly, as follows:

[0047] S1. The auxiliary tooling is fixedly connected to the spot welding device via the connecting seat assembly;

[0048] S1.1 Adjust the position of the rotating component to move it away from the welding device;

[0049] S2. Install the stator core 11 on the end of the positioning shaft 9, so that the stator core 11 terminal 12 faces the welding point of the welding device;

[0050] S2.1 Adjust the position of the rotating assembly so that it moves closer to the welding device. At this time, the terminal 12 at the highest point of the stator core 11 is located at the welding point.

[0051] S3. Start the spot welding machine and spot weld the terminals 12 of the stator core 11 located at the welding point;

[0052] S3.1 After the spot welding is completed, move the rotating component to a position away from the spot welding device again;

[0053] S4. The positioning shaft 9 is rotated by the drive structure, so that the adjacent unwelded terminals 12 are rotated to the highest position.

[0054] S4.1 Then adjust the position of the rotating component so that it moves closer to the spot welding device;

[0055] S5. Restart the spot welding machine and spot weld the terminals 12 of the stator core 11 located at the welding point;

[0056] S6. Repeat steps S3-S5 until all terminals 12 of the stator core 11 are spot welded, then remove the stator core 11.

[0057] Furthermore, a strong magnet 5 is provided on the side of the positioning baffle 4 facing the mounting plate 7. The mounting plate 7 of the rotating assembly is made of iron material, and the strong magnet 5 also plays a positioning role. The strong magnet 5 near the welding device ensures that the rotating assembly remains in a fixed position on the guide rail 3 during the welding process. The strong magnet 5 away from the welding device ensures that the welding position of the stator core 11 terminal 12 is adjusted after the rotating assembly has completely left the welding device.

[0058] To facilitate adjustment of the distance between the rotating component and the welding device, the length of the guide rail 3 is greater than or equal to twice the width of the mounting plate 7. It should be noted that the width of the mounting plate 7 mentioned here refers to the length of the edge of the mounting plate 7 parallel to the guide rail 3.

[0059] Furthermore, a limiting member 6 is provided on the side of the positioning baffle 4 facing the mounting plate 7. When the mounting plate 7 moves closer to one of the positioning baffles 4, the mounting plate 7 contacts the limiting member 6 of that positioning baffle 4. In this invention, the limiting member 6 is a limiting bolt. A screw hole is provided on the side of the mounting plate 7. The limiting bolt is screwed into the screw hole to achieve fixation. It is easy to understand that by changing the limiting bolts of different lengths, the minimum distance between the mounting plate 7 and the positioning baffle 4 can be adjusted, thereby adjusting the distance between the stator core 11 and the weld point.

[0060] In this invention, the base includes a support frame 1 and a fixed connecting plate 2, such as... Figure 1-4 As shown, the top surface of the support frame 1 is connected to the guide rail 3, and the bottom side of the support frame 1 is connected to the fixed connecting plate 2. The fixed connecting plate 2 is connected to the spot welding device. The support frame 1 and the fixed connecting plate are fixedly connected by bolts. More specifically, the bottom side of the support frame 1 is provided with screw holes, and the fixed connecting plate 2 is provided with through holes. Bolts pass through the fixed connecting plate and are threadedly connected to the support frame 1, thereby locking the support frame 1 and the fixed connecting plate 2. This invention allows the auxiliary tooling to be installed outside most of the spot welding devices by replacing the appropriate fixed connecting plate 2, and also allows the auxiliary tooling to always remain on a horizontal plane by changing the fixed connecting plate 2.

[0061] The base of the present invention may also be equipped with a push cylinder (not shown in the attached figure). The piston rod of the push cylinder is connected to the mounting plate 7 and automatically drives the rotating component to move along the guide rail 3. It is easy to understand that when the base is equipped with a push cylinder and the drive structure is an automated device, the auxiliary tooling of the present invention can realize the automatic feeding or retraction of the stator core 11 terminals 12, as well as the automatic switching of multiple terminals 12 at the welding point position, which greatly improves production efficiency.

[0062] Furthermore, the present invention can be used in conjunction with an automatic stator core 11 loading and unloading device to achieve fully automatic spot welding operations. The automatic stator core 11 loading and unloading device can be a multi-axis robotic arm device.

[0063] The embodiments provided by the present invention have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of the present invention, and the descriptions of the embodiments above are only for the purpose of helping to understand the core ideas of the present invention. It should be noted that those skilled in the art can make several improvements and modifications to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. An auxiliary tool for stator core terminal butt welding, characterized by, The device includes a connecting seat assembly, a rotating assembly, and a positioning assembly. The connecting seat assembly is connected to a spot welding device. The rotating assembly includes a mounting plate (7), a bearing seat (8), a positioning shaft (9), and a drive structure. The mounting plate (7) is disposed on the top surface of the connecting seat assembly. The bearing seat (8) is disposed on the mounting plate (7). One end of the positioning shaft (9) is rotatably connected to the bearing seat (8), and the other end of the positioning shaft (9) is connected to the stator core (11). The positioning assembly includes a positioning seat (13). The positioning ball structure (14) is provided, the positioning seat (13) is provided on the mounting plate (7) and located below the positioning shaft (9), the positioning seat (13) is provided with a mounting groove for mounting the positioning ball structure (14), the positioning ball structure (14) is embedded in the mounting groove, a return spring is provided between the positioning ball structure (14) and the mounting groove, the positioning shaft (9) is provided with multiple positioning grooves (15) parallel to each other on the circumferential side, and the positioning ball structure (14) contacts one of the positioning grooves (15); The connecting seat assembly includes a base and a guide rail (3). The base is connected to the spot welding device. The guide rail (3) is disposed on the top surface of the base. Positioning baffles (4) are provided at both ends of the guide rail (3). The mounting plate (7) of the rotating assembly is slidably connected to the guide rail (3). The positioning baffle (4) is provided with a limiting member (6) on the side facing the mounting plate (7), the limiting member (6) faces the mounting plate (7), and the limiting member (6) is detachably connected to the positioning baffle (4); The driving structure is a handle (10), the bottom end of which is fixedly connected to the circumferential side of the positioning shaft (9), and the handle (10) and the positioning shaft (9) are perpendicular to each other.

2. The auxiliary tooling of claim 1, wherein, The positioning baffle (4) is provided with a strong magnet (5) on the side facing the mounting plate (7), and the mounting plate (7) is made of iron material.

3. The auxiliary tool of claim 1, wherein The positioning shaft (9) is provided with a mounting slot (16) on one side of the end connected to the stator core (11), and the mounting slot (16) is adapted to the structure of the inner hole of the stator core (11).

4. The auxiliary tool of claim 1, wherein The base includes a support frame (1) and a fixed connecting plate (2). The top surface of the support frame (1) is connected to the guide rail (3), and the bottom side of the support frame (1) is connected to the fixed connecting plate (2). The fixed connecting plate (2) is connected to a spot welding device.

5. The auxiliary tool of claim 1, wherein A push cylinder is also provided on the base, and the piston rod of the push cylinder is connected to the mounting plate (7) to drive the rotating assembly to move along the guide rail (3).

6. A method of using an auxiliary tool for stator core terminal butt welding, characterized by, The auxiliary tooling described in any one of claims 1-5 is applied as follows: S1. The auxiliary tooling is fixedly connected to the spot welding device via the connecting seat assembly; S2. Install the stator core (11) on the end of the positioning shaft (9) so that the stator core (11) terminal (12) faces the welding point of the welding device; S3. Start the spot welding machine and spot weld the terminals (12) of the stator core (11) located at the welding point; S4. The positioning shaft (9) is rotated by the drive structure, so that the adjacent unsoldered terminals (12) are rotated to the highest position. S5. Restart the spot welding machine and spot weld the terminals (12) of the stator core (11) located at the welding point; S6. Repeat steps S3-S5 until all terminals (12) of the stator core (11) are spot welded, and then remove the stator core (11).

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