Clamping tool and flat welding apparatus for stator winding

Abstract

The application belongs to the technical field of motor assembly, and particularly relates to a clamping tool for a stator winding and a flat cutting and welding device. The clamping tool comprises a base plate provided with a mounting hole and a mounting cavity in communication with the mounting hole, the mounting cavity is used for accommodating at least part of the stator winding; a clamping assembly is rotationally connected with the base plate, the clamping assembly comprises a first clamping plate and a second clamping plate which are arranged in a stack, a plurality of first clamping grooves are arranged on the first clamping plate, and a plurality of second clamping grooves are arranged on the second clamping plate; and an elastic assembly is arranged between the base plate and the clamping assembly and surrounds the outer periphery of the mounting cavity. When the first clamping plate and the second clamping plate are opposite to each other in the rotation direction of the base plate, a containing groove is formed between the first clamping groove and the second clamping groove to clamp the hairpin wire, or the containing groove is opened to release the hairpin wire. The application can adaptively adjust the clamping force of the hairpin wire, reduce the possibility of movement of the hairpin wire during end welding, and improve the product qualification rate and welding efficiency.

Description

Technical Field

[0001] This application relates to the field of motor assembly technology, and more specifically, to a clamping fixture and cutting / welding equipment for stator windings. Background Technology

[0002] As a future drive motor for new energy vehicles, the stator winding of a flat-wire motor is made of wire with a rectangular cross-section. Compared to traditional round-wire motors with circular wire cross-sections, more wires can be crammed into the same area of ​​stator slots, thus increasing power density. Therefore, within the same volume, a flat-wire motor can accommodate more stator windings, allowing it to output higher power and torque with the same losses. This makes it particularly suitable for the miniaturization and weight reduction requirements of automotive drive motors.

[0003] In the stator windings of flat wire motors, the common conductor type is the hairpin. The manufacturing process of the stator windings mainly includes inserting insulating paper, inserting the hairpin, twisting the hairpin ends, cutting the ends, and welding the ends. During the end-cutting and welding processes, clamping fixtures are needed to fix the hairpins in place. However, in related technologies, the clamping fixtures can cause the hairpins to shift position after the end-cutting process, leading to poor welding in the subsequent welding process, low welding efficiency, and severely impacting the cycle time of automated production lines. Summary of the Invention

[0004] The purpose of this application is to provide a clamping fixture and cutting and welding equipment for stator windings, which can adaptively adjust the clamping force of the hairpin wire, reduce the possibility of the hairpin wire moving during the end welding process, and improve the product qualification rate and welding efficiency.

[0005] In a first aspect, embodiments of this application provide a clamping fixture for a stator winding, the stator winding including a plurality of hairpin wires spaced apart along its circumference, the clamping fixture including: a base plate, the base plate having mounting holes and a mounting cavity communicating with the mounting holes, the mounting cavity for accommodating at least a portion of the stator winding; a clamping assembly rotatably connected to the base plate, the clamping assembly including a first clamping plate and a second clamping plate stacked together, the first clamping plate having a plurality of first slots spaced apart along the circumference of the mounting cavity, the second clamping plate having a plurality of second slots spaced apart along the circumference of the mounting cavity, one first slot corresponding to one second slot; and an elastic component disposed between the base plate and the clamping assembly, and surrounding the outer periphery of the mounting cavity; wherein, when the rotation direction of the first clamping plate relative to the base plate is opposite to the rotation direction of the second clamping plate relative to the base plate, a receiving groove is formed between the first slots and the second slots to clamp the hairpin wires, or the receiving groove opens to release the hairpin wires.

[0006] According to the embodiments of this application, the clamping fixture for stator windings includes a base plate, a clamping assembly rotatably connected to the base plate, and an elastic component disposed between the base plate and the clamping assembly and arranged circumferentially along the clamping assembly. The clamping assembly includes a first clamping plate and a second clamping plate stacked together. A plurality of first slots on the first clamping plate and a plurality of second slots on the second clamping plate are respectively disposed in a one-to-one correspondence. When the rotation direction of the first clamping plate relative to the base plate is opposite to the rotation direction of the second clamping plate relative to the base plate, a receiving groove is formed between the first slots and the second slots to clamp the hairpin wire, or the receiving groove is opened to release the hairpin wire. Thus, the clamping force of the hairpin wire can be adaptively adjusted by the elastic component, reducing the possibility of the hairpin wire moving during the end welding process, and improving the product qualification rate and welding efficiency.

[0007] In addition, the clamping fixture for stator windings according to this application may also have the following additional technical features:

[0008] In some embodiments of this application, the first slot has a pair of first inner walls that are circumferentially opposite and spaced apart along the first clamping plate, one of the first inner walls having a first tip extending toward the other first inner wall; the second slot has a pair of second inner walls that are circumferentially opposite and spaced apart along the second clamping plate, one of the second inner walls having a second tip extending toward the other second inner wall; when the extension direction of the first tip is opposite to the extension direction of the second tip, and the first tip and the second tip at least partially overlap each other, a receiving groove is formed between the first slot and the second slot.

[0009] In some embodiments of this application, the substrate is further provided with a plurality of first sliding grooves and a plurality of second sliding grooves distributed circumferentially around the mounting hole. The first sliding groove is located on the side of the second sliding groove opposite to the mounting hole. In the circumferential direction of the mounting hole, the first sliding groove and the second sliding groove are staggered. The first clamping plate is rotatably connected to the substrate through a first pin penetrating the first sliding groove, and the second clamping plate is rotatably connected to the substrate through a second pin penetrating the second sliding groove.

[0010] In some embodiments of this application, the first slide and the second slide are arc-shaped grooves. On the outer periphery of the mounting hole, the first slide and the second slide are staggered by a preset arc length, and the central angle θ corresponding to the preset arc length is 3°~5°.

[0011] In some embodiments of this application, a plurality of positioning holes are provided at intervals around the outer periphery of the plurality of first slots on the first clamping plate, and a plurality of guide grooves are provided at intervals around the outer periphery of the plurality of second slots on the second clamping plate. The guide grooves extend circumferentially along the mounting cavity. One positioning hole is provided with one guide groove. A positioning pin is provided on the mounting cavity. The positioning pin passes through the guide groove and is connected to the positioning hole.

[0012] In some embodiments of this application, the clamping assembly further includes a first annular assembly and a second annular assembly coaxially arranged. The first annular assembly is sleeved on the outer periphery of the second annular assembly. One end of the first annular assembly is connected to a first clamping plate. A first pin passes through the first slide groove and the other end of the first annular assembly. One end of the second annular assembly is connected to a second clamping plate. A second pin passes through the second slide groove and the other end of the second annular assembly. An elastic component is disposed between the substrate, the first annular assembly, and the second annular assembly.

[0013] In some embodiments of this application, the first annular assembly includes a first annular member and a first mounting ring. The first annular member is disposed between the substrate and the first clamping plate, and the first mounting ring is disposed on the side of the substrate opposite to the first annular member. The second annular assembly includes a second annular member and a second mounting ring. The second annular member is disposed between the substrate and the second clamping plate, and the second mounting ring is disposed on the side of the substrate opposite to the second annular member. A first pin passes through the first mounting ring, the first sliding groove, and the first annular member in sequence, and a second pin passes through the second mounting ring, the second sliding groove, and the second annular member in sequence.

[0014] In some embodiments of this application, a plurality of second baffles are spaced apart on the side of the second annular member facing the substrate along its circumference, and a cavity is formed between two adjacent second baffles; a plurality of first baffles are spaced apart on the side of the first annular member facing the mounting cavity along its circumference, one first baffle is disposed in one cavity, and the first baffle and the second baffle are opposite to each other and spaced apart; the elastic component includes a plurality of elastic members spaced apart around the outer periphery of the mounting cavity, and each elastic member is disposed between the first baffle and the second baffle in one cavity.

[0015] In some embodiments of this application, the substrate is further provided with a plurality of oil grooves spaced apart along its circumference, and the oil grooves are respectively arranged adjacent to the first slide groove and the second slide groove.

[0016] In some embodiments of this application, the clamping fixture further includes a clamping handle, which includes a first handle and a second handle. The first handle is connected to a first mounting ring, and the second handle is connected to a second mounting ring. When the rotation direction of the first clamping plate relative to the substrate is opposite to the rotation direction of the second clamping plate relative to the substrate, the first handle and the second handle move closer to or further away from each other.

[0017] In some embodiments of this application, the clamping fixture further includes at least two clamping assemblies connected to the substrate. The at least two clamping assemblies are arranged circumferentially spaced along the clamping assembly and are radially slidable along the mounting cavity to clamp or release the stator winding.

[0018] Secondly, embodiments of this application provide a flat welding device, including clamping fixtures for stator windings according to various embodiments of this application.

[0019] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0020] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. Wherein:

[0021] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. Wherein:

[0022] Figure 1 This is a schematic diagram of the stator winding structure according to an embodiment of this application;

[0023] Figure 2 This is a three-dimensional structural diagram of the clamping tooling in one direction according to an embodiment of this application;

[0024] Figure 3 This is an exploded structural diagram of the clamping assembly of the clamping fixture according to an embodiment of this application;

[0025] Figure 4 This is a three-dimensional structural diagram of the clamping fixture in another direction according to an embodiment of this application;

[0026] Figure 5 for Figure 4 A top view of the clamping fixture shown;

[0027] Figure 6 for Figure 5 The clamping fixture shown is in cross-section along direction AA;

[0028] Figure 7 for Figure 2 A top view of the clamping fixture shown;

[0029] Figure 8 for Figure 7 The diagram shows the structure of the clamping fixture in which the receiving groove in region B is in a clamped state.

[0030] Figure 9 for Figure 7The diagram shows the structure of the clamping fixture with the accommodating groove in area B in the open state.

[0031] Figure 10 for Figure 2 A schematic diagram of the substrate structure in the clamping fixture shown;

[0032] Figure 11 for Figure 7 The clamping fixture shown is in cross-sectional view along the direction CC.

[0033] Figure 12 for Figure 2 The diagram shows an exploded view of the first and second annular components in the clamping fixture.

[0034] The labels in the attached diagram are as follows:

[0035] 100. Clamping fixture; 200. Stator winding; 210. Hairpin wire; 220. Stator core;

[0036] 1. Substrate; 10. Mounting hole; 11. First slide groove; 12. Second slide groove; 13. Mounting cavity; 14. Oil groove;

[0037] 2. Clamping assembly; 20. Receiving groove; 21. First clamping plate; 211. First slot; a1. First inner wall; b1. First tip; 212. Positioning hole; 22. Second clamping plate; 221. Second slot; a2. Second inner wall; b2. Second tip; 222. Guide groove; a. Arc-shaped groove; b. Circular groove; 25. Positioning pin;

[0038] 26. First annular assembly; 261. First annular component; 262. First mounting ring; 263. First baffle;

[0039] 27. Second annular assembly; 270. Chamber; 271. Second annular component; 272. Second mounting ring; 273. Second baffle;

[0040] 3. Elastic components; 31. Elastic parts;

[0041] 4. Clamping handle; 41. First handle; 42. Second handle;

[0042] 5. Clamping assembly. Detailed Implementation

[0043] Exemplary embodiments of this application will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of this application are shown in the drawings, it should be understood that this application may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of this application and to fully convey the scope of this application to those skilled in the art.

[0044] It should be understood that the terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “described” as used herein may also include the plural forms. The terms “comprising,” “including,” “containing,” and “having” are inclusive and therefore indicate the presence of the stated features, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not construed as requiring them to be performed in a particular order described or illustrated unless the order of performance is explicitly indicated. It should also be understood that additional or alternative steps may be used.

[0045] Although terms such as first, second, third, etc., may be used in this document to describe multiple elements, components, regions, layers, and / or segments, these elements, components, regions, layers, and / or segments should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or segment from another. Unless the context clearly indicates otherwise, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence. Therefore, the first element, component, region, layer, or segment discussed below may be referred to as the second element, component, region, layer, or segment without departing from the teachings of the exemplary embodiments.

[0046] For ease of description, spatial relative terms may be used in the text to describe the relationship of one element or feature relative to another element or feature, as shown in the figure. These relative terms include, for example, "inside," "outside," "middle," "outer," "below," "below," "above," "over," etc. Such spatial relative terms are intended to include different orientations of the device in use or operation, other than those depicted in the figure. For example, if the device in the figure is flipped, an element described as "below other elements or features" or "below other elements or features" would subsequently be oriented as "above other elements or features" or "above other elements or features." Therefore, the example term "below" can include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions), and the spatial relative descriptors used in the text will be interpreted accordingly.

[0047] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0048] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0049] Figure 1 This is a schematic diagram of the stator winding structure according to an embodiment of this application.

[0050] like Figure 1 As shown, the stator winding 200 of this embodiment includes a stator core 220 and a multi-turn winding disposed on the stator core 220. Each turn of the winding includes a plurality of hairpin wires 210 spaced apart circumferentially. The plurality of hairpin wires 210 of the multi-turn winding are radially aligned, such that the plurality of hairpin wires 210 are arranged in a group spaced apart radially, and the plurality of hairpin wires 210 are spaced apart circumferentially. The number of turns of the winding can be any number of turns, such as 2 turns, 4 turns, 6 turns, 8 turns, 12 turns, etc. For example, the stator winding 200 of this embodiment includes a 4-turn winding, each turn of the winding is woven sequentially circumferentially by a plurality of hairpin wires 210. The hairpin wires 210 can be U-shaped copper wires or I-shaped copper wires. The protruding ends of the hairpin wires 210 extend from the stator core 220 and are used for subsequent end cutting and end welding processes. Multiple hairpin wires 210 of the 4-turn winding are distributed at intervals along the circumference and radial direction of the stator core 220, and each group of hairpin wires 210 has 4 hairpin wires 210 in the radial direction.

[0051] The stator winding 200 is used in flat wire motors. The manufacturing process of the stator winding 200 mainly includes inserting insulating paper, inserting hairpin wires, twisting the ends of the hairpin wires, cutting off the ends, and welding the ends. As shown in the figure, the stator winding 200 is generally placed on a tray. The end twisting process of its hairpin wires 210 has been completed. The clamping fixture travels with the tray and can fix the hairpin wires 210 for end cutting and welding. In related technologies, the position of the hairpin wires may shift after the end cutting process, leading to poor welding in the subsequent end welding process, low welding efficiency, and seriously affecting the cycle time of automated production lines.

[0052] Therefore, the purpose of this application is to provide a clamping fixture for stator windings that can adaptively adjust the clamping force of the hairpin wire, reduce the possibility of the hairpin wire shifting during the end welding process, and improve the product qualification rate and welding efficiency.

[0053] Figure 2 This is a three-dimensional structural diagram of the clamping fixture in one direction according to an embodiment of this application. Figure 3 This is an exploded structural diagram of a clamping component of a clamping fixture according to an embodiment of this application. Figure 4 This is a three-dimensional structural diagram of the clamping fixture according to an embodiment of this application, taken in another direction. Figure 5 for Figure 4 The diagram shows a top view of the clamping fixture. Figure 6 for Figure 4 The clamping fixture shown is a cross-sectional view along direction AA. Figure 7 for Figure 2 The diagram shows a top view of the clamping fixture. Figure 8 for Figure 7 The diagram shows the structure of the clamping fixture in which the receiving groove in region B is in a clamped state. Figure 9 for Figure 7 The diagram shows the structure of the clamping fixture with the receiving groove in region B in the open state.

[0054] For ease of description of the various components of the clamping fixture 100 in the embodiments of this application, Figure 2 and Figure 4 The three-dimensional structural schematic diagrams of the clamping fixture 100 are shown from different directions. Figure 2 The clamping fixture 100 shown is positioned relative to its orientation. Figure 1 The viewpoint shown when the stator windings 200 are in mutual engagement, i.e. Figure 1 The stator winding 200 shown will be from Figure 2 The clamping fixture 100 shown is assembled below to allow its multiple hairpin wires 210 to... Figure 2 It extends from above. Figure 4 The clamping fixture 100 shown is viewed from... Figure 2 The diagram shows the structure of the clamping fixture 100 as viewed from below.

[0055] like Figures 2 to 9 As shown, this application provides a clamping fixture 100 for stator windings, including a base plate 1, a clamping assembly 2, and an elastic assembly 3.

[0056] The substrate 1 has mounting holes 10 and mounting cavities 13 communicating with the mounting holes 10. The mounting cavities 13 are used to accommodate at least a portion of the stator windings 200. Figure 4 As shown, the mounting cavity 13 is arranged in a stepped shape on the substrate 1. One end of the mounting cavity 13 is connected to the substrate 1, and the other end of the mounting cavity 13 has an opening. Multiple hairpin wires 210 of the stator winding 200 extend from one end of the opening of the mounting cavity 13.

[0057] The clamping assembly 2 is rotatably connected to the base plate 1. The clamping assembly 2 includes a first clamping plate 21 and a second clamping plate 22 stacked together. The first clamping plate 21 is provided with a plurality of first slots 211 spaced apart circumferentially along the mounting cavity 13. The second clamping plate 22 is provided with a plurality of second slots 221 spaced apart circumferentially along the mounting cavity 13. One first slot 211 corresponds to one second slot 221. Figure 3 and Figure 6 As shown, the first clamping plate 21 and the second clamping plate 22 are both circular plates. The first clamping plate 21 and the second clamping plate 22 are stacked one on top of each other. The multiple first slots 211 of the first clamping plate 21 and the multiple second slots 221 of the second clamping plate 22 correspond one to one.

[0058] The elastic component 3 is disposed between the substrate 1 and the clamping component 2, and is arranged around the outer periphery of the mounting cavity 13. Optionally, the elastic component 3 includes a plurality of elastic elements 31 arranged around the outer periphery of the mounting cavity 13. The elastic elements 31 can be compression springs. When the clamping component 2 rotates relative to the substrate 1, the elastic component 3 can provide a circumferential elastic force to the clamping component 2.

[0059] When the rotation direction of the first clamping plate 21 relative to the substrate 1 is opposite to the rotation direction of the second clamping plate 22 relative to the substrate 1, a receiving groove 20 is formed between the first slot 211 and the second slot 221 to clamp the hair clip wire 210, or the receiving groove 20 is opened to release the hair clip wire 210.

[0060] like Figure 3 and Figure 8As shown, the rotation direction of the first clamping plate 21 relative to the substrate 1 is opposite to the rotation direction of the second clamping plate 22 relative to the substrate 1. For example, the first clamping plate 21 rotates clockwise around its own central axis, and the second clamping plate 22 rotates counterclockwise around its own central axis, so that a receiving groove 20 is formed between the first slot 211 and the second slot 221. The four protruding ends of the two radially distributed hairpin wires 210 enter the two slots of the receiving groove 20 respectively and are clamped. Since the elastic component 3 can provide circumferential elastic force for the clamping component 2, the receiving groove 20 can always maintain the clamping force of the hairpin wires 210 in the circumferential direction to prevent the hairpin wires 210 from moving. Moreover, the magnitude of the clamping force can be adaptively adjusted according to the different types and sizes of the hairpin wires 210.

[0061] When the stator winding 200 is produced on the automated production line, the clamping fixture 100 moves with the pallet to the end-cutting station, where it clamps the protruding end of the hairpin wire 210 for end-cutting. Then, it moves with the pallet to the end-welding station, where the clamping fixture 100 clamps the protruding end of the hairpin wire 210 for welding. Because the receiving grooves 20 of the first clamping plate 21 and the second clamping plate 22 can always clamp the hairpin wire 210 under the circumferential elastic force of the elastic component 3, the hairpin wire 210 will not move due to external influences such as station switching. This improves the product qualification rate of the welding process and greatly increases welding efficiency.

[0062] like Figure 9 As shown, after the hairpin wire 210 has undergone the end welding process, the first clamping plate 21 rotates counterclockwise around its own central axis, and the second clamping plate 22 rotates clockwise around its own central axis. This opens the receiving slot 20 to release the hairpin wire 210, thereby removing the clamping fixture 100 from the stator winding 200.

[0063] According to the embodiments of this application, the clamping fixture 100 for stator winding 200 includes a base plate 1, a clamping assembly 2 rotatably connected to the base plate 1, and an elastic assembly 3 disposed between the base plate 1 and the clamping assembly 2. The clamping assembly 2 includes a first clamping plate 21 and a second clamping plate 22 stacked together. A plurality of first slots 211 on the first clamping plate 21 and a plurality of second slots 221 on the second clamping plate 22 are correspondingly disposed. When the first clamping plate 21 and the second clamping plate 22 rotate in opposite directions relative to the base plate 1, a receiving groove 20 is formed between the first slots 211 and the second slots 221 to clamp the hairpin wire 210, or the receiving groove 20 is opened to release the hairpin wire 210. Thus, the clamping force of the hairpin wire 210 can be adaptively adjusted by the elastic assembly 3, reducing the possibility of the hairpin wire 210 shifting during the end welding process, and improving the product qualification rate and welding efficiency.

[0064] In some embodiments, the first slot 211 has a pair of first inner walls a1 that are circumferentially opposite and spaced apart along the first clamping plate 21, one of the first inner walls a1 having a first tip b1 extending toward the other first inner wall a1; the second slot 221 has a pair of second inner walls a2 that are circumferentially opposite and spaced apart along the second clamping plate 22, one of the second inner walls a2 having a second tip b2 extending toward the other second inner wall a2; when the extension direction of the first tip b1 is opposite to the extension direction of the second tip b2, and the first tip b1 and the second tip b2 at least partially overlap each other, a receiving groove 20 is formed between the first slot 211 and the second slot 221.

[0065] In this embodiment, the stator winding 200 with 4 turns is used as an example for explanation. The multiple hairpin wires 210 of the 4 turns of winding are distributed at intervals along the circumference and radial direction of the stator core 220. In the radial direction, each group of hairpin wires 210 has 4 hairpin wires 210. Among the 4 hairpin wires 210, the 2 hairpin wires 210 closer to the rotation center of the stator winding 200 are closer together, the 2 hairpin wires 210 farther from the rotation center of the stator winding 200 are closer together, and the 2 hairpin wires 210 in the middle are separated by a certain distance.

[0066] like Figure 3 , Figure 8 and Figure 9 As shown, the clamping assembly 2 includes a first clamping plate 21 and a second clamping plate 22 stacked together. A first inner wall a1 of the first slot 211 of the first clamping plate 21 is provided with a first tip b1 extending toward the other first inner wall a1. A second inner wall a2 of the second slot 221 of the second clamping plate 22 is provided with a second tip b2 extending toward the other second inner wall a2. The first tip b1 and the second tip b2 each have two inclined sides. When the first tip b1 and the second tip b2 overlap at least partially, a receiving groove 20 is formed between the first slot 211 and the second slot 221. The receiving groove 20 includes two slots located on both sides of the overlap of the first tip b1 and the second tip b2. Each slot can accommodate the protruding ends of two hairpin wires 210.

[0067] The beveled edges of the first tip b1 and the second tip b2 can guide the corresponding hairpin wires 210 to gradually enter the receiving groove 20. The width of the receiving groove 20 is automatically adjusted according to the size of the hairpin wires 210. If the hairpin wires 210 move or shift due to various external factors after the end-cutting process is completed, the beveled edges of the first tip b1 and the second tip b2 can automatically correct the position of the hairpin wires 210, solving the problem of poor welding caused by the movement of the hairpin wires 210 and greatly improving the welding efficiency.

[0068] Understandably, when the stator winding 200 has more turns, the shape of the first slot 211 of the first clamping plate 21 and the second slot 221 of the second clamping plate 22 will also change. That is, the number of first tips b1 and second tips b2 can be more, so as to form more slots to accommodate more hairpin wires 210. For example, the stator winding 200 has 6 turns, and each group of hairpin wires 210 in the radial direction has 6 hairpin wires 210. The first slot 211 of the first clamping plate 21 is provided with two first tips b1 spaced apart, and the second slot 221 of the second clamping plate 22 is provided with two second tips b2 spaced apart. When the first tips b1 and the second tips b2 at least partially overlap each other, the receiving groove 20 formed between the first slot 211 and the second slot 221 includes 3 slots spaced apart, and each slot can accommodate the protruding ends of 2 hairpin wires 210.

[0069] Figure 10 for Figure 2 A schematic diagram of the substrate structure in the clamping fixture shown.

[0070] In some embodiments, the substrate 1 is further provided with a plurality of first sliding grooves 11 and a plurality of second sliding grooves 12 distributed circumferentially around the mounting hole 10. The first sliding grooves 11 are located on the side of the second sliding grooves 12 opposite to the mounting hole 10. The first sliding grooves 11 and the second sliding grooves 12 are staggered in the circumferential direction of the mounting hole 10. The first clamping plate 21 is rotatably connected to the substrate 1 by a first pin (not shown in the figure) passing through the first sliding groove 11, and the second clamping plate 22 is rotatably connected to the substrate 1 by a second pin (not shown in the figure) passing through the second sliding groove 12.

[0071] like Figure 3 and Figure 10 As shown, the clamping assembly 2 is rotatably connected to the base plate 1. The base plate 1 is provided with a plurality of first sliding grooves 11 and a plurality of second sliding grooves 12 circumferentially spaced around the mounting hole 10. A first pin passes through the first sliding groove 11 and the first clamping plate 21, allowing the first clamping plate 21 to rotate around the central axis of the mounting hole 10 along the first sliding groove 11. A second pin passes through the second sliding groove 12, allowing the second clamping plate 22 to rotate around the central axis of the mounting hole 10 along the second sliding groove 12. Since the first sliding grooves 11 and the second sliding grooves 12 are staggered circumferentially around the mounting hole 10, an angle difference can be formed between the first sliding grooves 11 and the second sliding grooves 12 by the opposite rotation of the first clamping plate 21 and the second clamping plate 22, thereby forming a receiving groove 20 to clamp the hair clip wire 210, or the receiving groove 20 to open to release the hair clip wire 210. The operation is simple and reliable.

[0072] In addition, the multiple first sliding grooves 11 and multiple second sliding grooves 12 are circumferentially spaced around the mounting hole 10, which can make the first clamping plate 21 and the second clamping plate 22 uniformly stressed in the circumferential direction and rotate around the central axis of the mounting hole 10 respectively, preventing the first clamping plate 21 and the second clamping plate 22 from deflecting during rotation and affecting the dimensional accuracy of the receiving groove 20, and ensuring that the clamping force of the receiving groove 20 is stable and reliable.

[0073] In some embodiments, on the outer periphery of the mounting hole 10, the first slide groove 11 and the second slide groove 12 are staggered by a preset arc length, and the central angle θ corresponding to the preset arc length is 3°~5°.

[0074] like Figure 10 As shown, the first slide groove 11 and the second slide groove 12 are elongated arc holes. The magnitude of the reverse rotation angle of the first clamping plate 21 and the second clamping plate 22 determines the deformation of the elastic component 3, which in turn affects the clamping force of the receiving groove 20. Optionally, the central angle θ corresponding to the preset arc length of the offset between the first slide groove 11 and the second slide groove 12 is 3°~5°. The appropriate angle is selected according to the different sizes of hairpin wires 210 and the stiffness coefficient of the elastic component 3, etc., which will not be elaborated further.

[0075] Figure 11 for Figure 7 The clamping fixture shown is in cross-sectional view along the CC direction.

[0076] In some embodiments, a plurality of positioning holes 212 are provided on the first clamping plate 21 around the outer periphery of the plurality of first slots 211, and a plurality of guide grooves 222 are provided on the second clamping plate 22 around the outer periphery of the plurality of second slots 221. The guide grooves 222 extend circumferentially along the mounting cavity 13. One positioning hole 212 is correspondingly provided with one guide groove 222. A positioning pin 25 is provided on the mounting cavity 13. The positioning pin 25 passes through the guide groove 222 and is connected to the positioning hole 212.

[0077] like Figure 3 , Figure 7 and Figure 11 As shown, the first clamping plate 21 is provided with four spaced positioning holes 212 around the outer periphery of the plurality of first slots 211, and the second clamping plate 22 is provided with four spaced guide grooves 222 around the outer periphery of the plurality of second slots 221. The mounting cavity 13 is provided with four positioning pins 25, each positioning pin 25 passing through the guide groove 222 and connecting to the positioning hole 212. Figure 3As shown, exemplarily, the guide groove 222 includes an arc-shaped groove a and a circular groove b connected in sequence, and the inner diameter of the circular groove b is larger than the width of the arc-shaped groove a. The locating pin 25 has an internal thread. When the clamping fixture 100 is in the working state, the locating pin 25 moves to the arc-shaped groove a of the guide groove 222 and is threadedly connected to the locating pin 25 through a locating hole 212 on one side of the first clamping plate 21 by passing a countersunk screw through it. When the clamping fixture 100 is in the non-working state, the locating pin 25 moves to the circular groove b of the guide groove 222, facilitating the assembly and disassembly of the locating pin 25.

[0078] Since the first clamping plate 21 and the second clamping plate 22 are relatively thin, the structural strength and rigidity of the clamping assembly 2 can be improved by the cooperation of multiple positioning pins 25 and multiple guide grooves 222, and the first clamping plate 21 and the second clamping plate 22 can be prevented from deforming after long-term use.

[0079] In some embodiments, the clamping assembly 2 further includes a first annular assembly 26 and a second annular assembly 27 coaxially arranged. The first annular assembly 26 is sleeved on the outer periphery of the second annular assembly 27. One end of the first annular assembly 26 is connected to the first clamping plate 21. A first pin passes through the first slide groove 11 and the other end of the first annular assembly 26. One end of the second annular assembly 27 is connected to the second clamping plate 22. A second pin passes through the second slide groove 12 and the other end of the second annular assembly 27. An elastic component 3 is disposed between the base plate 1 and the second annular assembly 27.

[0080] like Figure 6 As shown, the first clamping plate 21 and the second clamping plate 22 are both circular plates, with the outer diameter of the first clamping plate 21 being larger than that of the second clamping plate 22. A first annular assembly 26 is disposed between the first clamping plate 21 and the substrate 1, and a second annular assembly 27 is disposed between the second clamping plate 22 and the substrate 1. The first annular assembly 26 is sleeved on the outer periphery of the second annular assembly 27, forming an accommodating space for the elastic component 3 between the first annular assembly 26, the second annular assembly 27, and the substrate 1. A first pin passes through the first sliding groove 11 and the other end of the first annular assembly 26, and a second pin passes through the second sliding groove 12 and the other end of the second annular assembly 27, thereby generating a reliable and effective clamping force through the elastic component 3 while the first clamping plate 21 and the second clamping plate 22 rotate relative to the substrate 1.

[0081] In some embodiments, the first annular assembly 26 includes a first annular member 261 and a first mounting ring 262. The first annular member 261 is disposed between the substrate 1 and the first clamping plate 21, and the first mounting ring 262 is disposed on the side of the substrate 1 opposite to the first annular member 261. The second annular assembly 27 includes a second annular member 271 and a second mounting ring 272. The second annular member 271 is disposed between the substrate 1 and the second clamping plate 22, and the second mounting ring 272 is disposed on the side of the substrate 1 opposite to the second annular member 271. A first pin passes through the first mounting ring 262, the first sliding groove 11 and the first annular member 261 in sequence, and a second pin passes through the second mounting ring 272, the second sliding groove 12 and the second annular member 271 in sequence.

[0082] like Figure 6 As shown, the first annular component 261 and the first mounting ring 262 are located on the upper and lower sides of the substrate 1, and the second annular component 271 and the second mounting ring 272 are also located on the upper and lower sides of the substrate 1. A first pin passes through the first mounting ring 262, the first sliding groove 11, and the first annular component 261 in sequence, and a second pin passes through the second mounting ring 272, the second sliding groove 12, and the second annular component 271 in sequence, thereby enabling the first clamping plate 21 and the second clamping plate 22 to rotate in opposite directions relative to the substrate 1. This arrangement facilitates the processing and assembly of the various components in the first annular assembly 26 and the second annular assembly 27, reducing manufacturing costs.

[0083] Figure 12 for Figure 2 The diagram shows an exploded view of the first and second annular components in the clamping fixture.

[0084] In some embodiments, the second annular member 271 has a plurality of second baffles 273 spaced apart along its circumference on the side facing the substrate 1, and a cavity 270 is formed between two adjacent second baffles 273; the first annular member 261 has a plurality of first baffles 263 spaced apart along its circumference on the side facing the mounting cavity 13, one first baffle 263 is disposed in one cavity 270, and the first baffle 263 and the second baffle 273 are opposite to each other and spaced apart; the elastic component 3 includes a plurality of elastic members 31 spaced apart around the outer periphery of the mounting cavity 13, and each elastic member 31 is disposed between a first baffle 263 and a second baffle 273 in one cavity 270.

[0085] like Figure 11 and Figure 12As shown, the elastic element 31 can be a compression spring. The second annular member 271, facing the substrate 1, forms multiple cavities 270 through a plurality of second baffles 273 spaced circumferentially. A cavity 270 is formed between two adjacent second baffles 273. The multiple second baffles 273 and the second annular member 271 can be connected as a single unit using fasteners such as screws. The first annular member 261, facing the inner wall of the mounting cavity 13, is provided with a plurality of first baffles 263 spaced apart. The multiple first baffles 263 can be connected as a single unit to the first annular member 261 using fasteners such as screws. One first baffle 263 is disposed within one cavity 270, and the first baffle 263 and the second baffle 273 within each cavity 270 are opposite to and spaced apart. Each elastic element 31 is disposed between the first baffle 263 and the second baffle 273 within a cavity 270. Thus, when the rotation direction of the first clamping plate 21 relative to the substrate 1 is opposite to the rotation direction of the second clamping plate 22 relative to the substrate 1, the rotation direction of the first annular member 261 is also opposite to the rotation direction of the second annular member 271, causing relative movement between the first baffle 263 and the second baffle 273 corresponding to each cavity 270 and compressing the elastic member 31, thereby generating a circumferential elastic force, and applying the elastic force to the first slot 211 and the second slot 221, so that an accommodating groove 20 is formed between them and a clamping force for clamping the hair clip wire 210 or a releasing clamping force is generated.

[0086] In some embodiments, the first annular member 261 includes a first body and a first base plate that are separately disposed. The first body has a plurality of pairs of first baffles 263 that are spaced apart along its circumference on the side facing the mounting cavity 13. The first base plate is disposed between the substrate 1 and the elastic component 3. The first annular member 261 is connected to the first pin through the first base plate. The second annular member 271 includes a second body and a second base plate that are separately disposed. The second body has a plurality of second baffles 273 that are spaced apart along its circumference on the side facing the substrate 1. The second base plate is disposed between the substrate 1 and the elastic component 3. The second annular member 271 is connected to the second pin through the second base plate.

[0087] Considering that the first annular component 26 and the second annular component 27 have many parts, and the elastic element 31 is disposed in the cavity 270 formed by the second annular component 271 and the second annular component 271, in order to facilitate the assembly of the elastic element 31, the first pin and the second pin, the embodiment of this application can divide the first annular component 261 into a first body and a first base plate. The first body has multiple pairs of first baffles 263 arranged at intervals along its circumference on the side facing the mounting cavity 13. The first body and the first base plate can be connected by fasteners. The second annular component 271 can be divided into a second body and a second base plate. The second body has multiple pairs of second baffles 273 arranged at intervals along its circumference on the side facing the substrate 1. The second body and the second base plate can be connected by fasteners. This facilitates the assembly of each elastic element 31 in the elastic component 3 with the first body, the first base plate, the second body, and the second base plate, and then the assembly of the first pin with the first mounting ring 262, the first slot 211, and the first base plate, as well as the assembly of the second pin with the second mounting ring 272, the second slot 221, and the second base plate.

[0088] In some embodiments, the substrate 1 is further provided with a plurality of oil grooves 14 spaced apart along its circumference, and the oil grooves 14 are respectively arranged adjacent to the first slide groove 11 and the second slide groove 12.

[0089] like Figure 10 As shown, the first annular component 26 and the second annular component 27 of the clamping assembly 2 are rotatably connected to the base plate 1. The first annular component 261 and the second annular component 271 will wear down over time due to rotation relative to the base plate 1. Therefore, the base plate 1 is also provided with a plurality of spaced oil grooves 14 along its circumference. Each oil groove 14 is adjacent to a first sliding groove 11 and a second sliding groove 12, respectively. The oil grooves 14 are used to store lubricating oil. The oil grooves 14 can be elongated holes as shown in the figure, or grooves of other shapes with labyrinthine cavities, as long as they can store lubricating oil. The oil grooves 14 allow lubricating oil to be placed between the first sliding groove 11 and the first pin, and between the second sliding groove 12 and the second pin, and to form oil films between the contact surfaces of the base plate 1 and the first annular component 261, respectively, improving the smoothness of rotation of the clamping assembly 2 and increasing its service life.

[0090] In some embodiments, the clamping fixture 100 further includes a clamping handle 4, which includes a first handle 41 and a second handle 42. The first handle 41 is connected to the first mounting ring 262, and the second handle 42 is connected to the second mounting ring 272. When the rotation direction of the first clamping plate 21 relative to the substrate 1 is opposite to the rotation direction of the second clamping plate 22 relative to the substrate 1, the first handle 41 and the second handle 42 move closer to or further away from each other.

[0091] like Figure 4 and Figure 5 As shown, the first handle 41 of the clamping handle 4 is connected to the first mounting ring 262, and the second handle 42 is connected to the second mounting ring 272. By bringing the first handle 41 and the second handle 42 closer together with a robotic arm or by hand, the receiving slot 20 can be opened, making it easier for the hair clip wire 210 to extend into the receiving slot 20. Then, by releasing the first handle 41 and the second handle 42, the receiving slot 20 can clamp the hair clip wire 210, improving the convenience of operation.

[0092] In some embodiments, the clamping fixture 100 further includes at least two clamping assemblies 5 connected to the substrate 1. The at least two clamping assemblies 5 are arranged circumferentially spaced along the clamping assembly 2 and are radially slidable along the mounting cavity 13 to clamp or release the stator winding 200.

[0093] like Figure 4 and Figure 5 As shown, the number of clamping assemblies 5 can be two or three. Since the clamping assemblies 5 can slide radially along the mounting cavity 13, at least two clamping assemblies 5 can enable the stator core 220 of the stator winding 200 to have an automatic centering function, ensuring that the stator winding 200 and the clamping fixture 100 can be coaxially arranged, thereby ensuring that the hairpin wire 210 can extend into the receiving groove 20 without significant displacement. Specifically, the clamping assembly 5 includes a mounting plate, clamping members, and a sliding assembly. The mounting plate is connected to the base plate 1. The sliding assembly includes a slidingly connected guide rail and a slider. The guide rail is connected to the side of the mounting plate opposite to the base plate 1 and extends radially along the mounting cavity 13. The slider is connected to the clamping members, so that at least two clamping members of at least two clamping assemblies 5 can slide radially along the mounting cavity 13 to clamp or release the stator winding 200.

[0094] In addition, this application embodiment also provides a flat welding device, which includes a clamping fixture 100 for stator windings according to various embodiments of this application. The clamping fixture 100 can adaptively adjust the clamping force of the hairpin wire 210 through the elastic component 3 disposed between the substrate 1 and the clamping assembly 2, reducing the possibility of the hairpin wire 210 shifting during the end welding process, and improving the product qualification rate and welding efficiency. In addition, the clamping fixture 100 can automatically correct the position of the hairpin wire 210 through the bevel of the first tip b1 provided on the first slot 211 of the first clamping plate 21 and the bevel of the second tip b2 provided on the second slot 221 of the second clamping plate 22. The stator core 220 of the stator winding 200 is automatically centered by at least two clamping assemblies 5 to ensure that the hairpin wire 210 can extend into the receiving groove 20 formed between the first slot 211 and the second slot 221 without shifting. The number of clamping fixtures 100 can be multiple sets. Multiple sets of clamping fixtures 100 matched with different processes can greatly improve the production cycle of automated production lines.

[0095] The above description is merely a preferred embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A holding tool for a stator winding, the stator winding comprising a plurality of hairpin conductors arranged at intervals in a self-circumferential direction, characterized by, The clamping tool comprises: a base plate, wherein a mounting hole and a mounting cavity in communication with the mounting hole are arranged on the base plate, and the mounting cavity is used for accommodating at least part of the stator winding; a clamping assembly rotatably connected with the base plate, wherein the clamping assembly comprises a first clamping plate and a second clamping plate arranged in a stack, a plurality of first clamping grooves are arranged on the first clamping plate and spaced along the circumference of the mounting cavity, a plurality of second clamping grooves are arranged on the second clamping plate and spaced along the circumference of the mounting cavity, and one first clamping groove is arranged in correspondence with one second clamping groove; and an elastic assembly arranged between the base plate and the clamping assembly and around the outer periphery of the mounting cavity. When the rotation direction of the first clamping plate relative to the base plate is opposite to the rotation direction of the second clamping plate relative to the base plate, the first clamping groove and the second clamping groove form an accommodation groove to clamp the hairpin wire, or the accommodation groove is opened to release the hairpin wire. The first clamping groove has a pair of first inner walls oppositely and spaced along the circumference of the first clamping plate, one of the first inner walls is provided with a first pointed end extending towards the other first inner wall; the second clamping groove has a pair of second inner walls oppositely and spaced along the circumference of the second clamping plate, one of the second inner walls is provided with a second pointed end extending towards the other second inner wall; the extending direction of the first pointed end is opposite to the extending direction of the second pointed end, and when the first pointed end and the second pointed end at least partially overlap with each other, the first clamping groove and the second clamping groove form the accommodation groove. The base plate is further provided with a plurality of first sliding grooves and a plurality of second sliding grooves spaced along the circumference of the mounting hole, the first sliding groove is located on the side of the second sliding groove away from the mounting hole, and in the circumferential direction of the mounting hole, the first sliding groove and the second sliding groove are arranged staggered. The first clamping plate is rotatably connected with the base plate through a first pin shaft penetrating the first sliding groove, and the second clamping plate is rotatably connected with the base plate through a second pin shaft penetrating the second sliding groove.

2. The clamping tool for a stator winding according to claim 1, characterized in that, In the outer circumferential direction of the mounting hole, the first sliding groove and the second sliding groove are arranged staggered by a preset arc length, and the central angle θ corresponding to the preset arc length is 3°-5°.

3. The clamping tool for a stator winding according to claim 1, characterized in that, The first clamping plate is further provided with a plurality of positioning holes spaced around the outer periphery of the plurality of first clamping grooves, the second clamping plate is further provided with a plurality of guide grooves spaced around the outer periphery of the plurality of second clamping grooves, the guide grooves extend along the circumferential direction of the mounting cavity, one positioning hole is arranged in correspondence with one guide groove, and the mounting cavity is provided with a positioning pin penetrating the guide groove and connected with the positioning hole.

4. The clamping tool for a stator winding according to claim 1, characterized by The clamping assembly further comprises a coaxially arranged first ring assembly and a second ring assembly, the first ring assembly is sleeved on the outer periphery of the second ring assembly, one end of the first ring assembly is connected with the first clamping plate, the other end of the first pin shaft penetrates through the first sliding slot and the first ring assembly, one end of the second ring assembly is connected with the second clamping plate, the other end of the second pin shaft penetrates through the second sliding slot and the second ring assembly, and the elastic assembly is arranged between the base plate, the first ring assembly and the second ring assembly.

5. A clamping tool for a stator winding according to claim 4, characterised in that The first ring assembly comprises a first ring and a first mounting ring, the first ring is arranged between the base plate and the first clamping plate, and the first mounting ring is arranged on the side of the base plate away from the first ring. The second ring assembly comprises a second ring and a second mounting ring, the second ring is arranged between the base plate and the second clamping plate, and the second mounting ring is arranged on the side of the base plate away from the second ring. The first pin shaft penetrates through the first mounting ring, the first sliding slot and the first ring in sequence, and the second pin shaft penetrates through the second mounting ring, the second sliding slot and the second ring in sequence.

6. A clamping tool for a stator winding according to claim 5, characterised in that The side of the second ring towards the base plate is provided with a plurality of second baffles arranged along the circumferential direction of the second ring at intervals, and a cavity is formed between adjacent two second baffles. The side of the first ring towards the mounting cavity is provided with a plurality of first baffles arranged along the circumferential direction of the first ring at intervals, one first baffle is arranged in one cavity, and the first baffles are arranged opposite and spaced apart from the second baffles. The elastic assembly comprises a plurality of elastic members arranged at intervals around the outer periphery of the mounting cavity, and each elastic member is arranged between the first baffle and the second baffle in one cavity.

7. The clamping tool for a stator winding according to claim 1, characterized in that, The base plate is further provided with a plurality of oil grooves arranged along the circumferential direction of the base plate at intervals, and the oil grooves are arranged adjacent to the first sliding slot and the second sliding slot, respectively.

8. The clamping tool for a stator winding according to claim 5, characterized in that, The clamping tool further comprises a clamping handle, the clamping handle comprises a first handle and a second handle, the first handle is connected with the first mounting ring, the second handle is connected with the second mounting ring, and when the rotation direction of the first clamping plate relative to the base plate is opposite to the rotation direction of the second clamping plate relative to the base plate, the first handle and the second handle are close to or away from each other.

9. A clamping tool for a stator winding according to any one of claims 1 to 8, characterised in that, The clamping tool further comprises at least two clamp assemblies connected with the base plate, the at least two clamp assemblies are arranged at intervals along the circumferential direction of the clamping assembly, and the clamp assemblies are slidable along the radial direction of the mounting cavity to clamp or release the stator winding.

10. A flush-cutting welding apparatus characterized by, The clamping tool for the stator winding comprises any one of claims 1 to 9. The clamping tool for the stator winding comprises any one of claims 1 to 9.

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