Cutter mechanism and flat cutting device for stator winding

Abstract

The invention belongs to the technical field of motor assembly, and particularly relates to a cutter mechanism and a flat cutting device for a stator winding, and the cutter mechanism comprises a supporting frame which is provided with a containing groove; the static knife covers the containing groove, a cutting groove communicated with the containing groove is formed in the static knife, and the cutting groove is used for enabling the end of the hairpin wire to be inserted into the cutting groove and penetrate through the containing groove; the anti-backlash assembly comprises a sliding part and a driving part, the sliding part is movably connected with the supporting frame, a hanging part is arranged on the side, away from the supporting frame, of the sliding part, and the driving part is in pivot connection with the hanging part, so that the driving part can drive the sliding part to abut against the static knife and push the static knife to move so as to eliminate a gap between the hairpin wire and the groove wall of the cutting groove; the movable cutter is movably arranged in the containing groove, and the movable cutter can move towards the cutting groove in the direction opposite to the moving direction of the static cutter so as to shear the end of the hairpin wire. According to the invention, the possibility of deformation of the end part of the hairpin wire in the shearing process can be reduced, and the product percent of pass of subsequent procedures is improved.

Description

Technical Field

[0001] The present application relates to the technical field of motor assembly, and more specifically, to a cutter mechanism and a cutting device for stator windings. Background Art

[0002] As the driving motor of future new energy vehicles, the stator winding of the flat wire motor is wound with a rectangular wire cross-section. Compared with the traditional round wire motor with a round wire cross-section, more wires can be stuffed into the stator wire slot of the same area, thereby increasing the power density. Therefore, under the same volume, the flat wire motor can be stuffed with more stator windings, so that the flat wire motor can output higher power and torque under the same loss, which is particularly suitable for the application requirements of miniaturization and lightweight of automotive drive motors.

[0003] In the stator winding of the flat wire motor, the common wire form is the hairpin wire. The manufacturing process of the stator winding mainly includes inserting insulating paper, inserting hairpin wire, twisting the end of the hairpin wire, cutting the end, welding the end, etc. After the hairpin wire is inserted into the stator core and the end is twisted and formed, the excess or uneven part of the end of the hairpin wire needs to be uniformly cut flat to facilitate welding. In the related technology, due to the gap between the hairpin wire and the groove on the peripheral side, the hairpin wire will be greatly deformed after the end is cut, affecting the product qualification rate of the subsequent welding process. Summary of the invention

[0004] The purpose of the present application is to provide a cutter mechanism and a cutting device for stator windings, which can reduce the possibility of deformation of the ends of hairpin wires in the stator windings during the shearing process and improve the product qualification rate of subsequent welding processes.

[0005] In the first aspect, an embodiment of the present application provides a cutting knife mechanism, comprising: a support frame having a receiving slot; a stationary knife covering the receiving slot, the stationary knife being provided with a cutting slot connected to the receiving slot, the cutting slot being used to allow an end of a target object to be inserted therein and pass through the receiving slot; a gap elimination assembly, comprising a sliding member and a driving member, the sliding member being movably connected to the support frame, a hanging portion being provided on a side of the sliding member facing away from the support frame, the driving member being pivotally connected to the hanging portion so that the driving member can drive the sliding member to abut against the stationary knife and push the stationary knife to move, so as to eliminate the gap between the target object and the slot wall of the cutting slot; and a moving knife movably arranged in the receiving slot, the moving knife being able to move toward the cutting slot in a direction opposite to the moving direction of the stationary knife, so as to shear the end of the target object.

[0006] The cutting knife mechanism provided in the embodiment of the present application includes a support frame with a receiving slot, a stationary knife covering the receiving slot, a movable knife movably arranged in the receiving slot, and a gap eliminating component movably connected to the support frame, wherein the gap eliminating component includes a sliding member and a driving member, the sliding member is movably connected to the support frame, a hanging portion is arranged on the side of the sliding member away from the support frame, and the driving member is pivotally connected to the hanging portion, so that the driving member can drive the sliding member to abut against the stationary knife and push the stationary knife to move, so as to eliminate the gap between the target object such as a hairpin wire and the slot wall of the cutting slot of the stationary knife, thereby reducing the possibility of deformation of the end of the hairpin wire in the stator winding during the shearing process of the passive knife, and improving the product qualification rate of the subsequent welding process.

[0007] In addition, the cutter mechanism according to the present application may also have the following additional technical features: In some embodiments of the present application, the driving member is arranged at a preset angle to the hanging portion in the initial position, and when the driving member rotates relative to the hanging portion, the distance between the end of the driving member away from the hanging portion and the support frame remains unchanged.

[0008] In some embodiments of the present application, the backlash elimination assembly further includes a compressible reset member, and the reset member is disposed between a side of the stationary knife away from the sliding member and the support frame.

[0009] In some embodiments of the present application, the cutting mechanism also includes a pressure plate, which is arranged on the support frame, and a guide groove for accommodating a static knife is provided on the pressure plate. A sliding groove connected to the guide groove is also provided at one end of the pressure plate. A driving part connected to the hanging part is provided on the side of the sliding member facing the support frame, and the driving part is embedded in the sliding groove and abuts against the static knife.

[0010] In some embodiments of the present application, the cutting mechanism further includes a propulsion assembly, which is movably connected to the support frame, and one end of the propulsion assembly can extend into the accommodating groove and is fixedly connected to the movable knife to drive the movable knife to move.

[0011] In some embodiments of the present application, the moving knife is located on the side of the propulsion assembly facing the stationary knife, and an elastic member is provided between the propulsion assembly and the moving knife, and the elastic member is used to push the moving knife to fit the stationary knife.

[0012] In some embodiments of the present application, the propulsion assembly includes a first propulsion member and a second propulsion member arranged in a stacked manner, the movable knife is located on the side of the second propulsion member facing away from the first propulsion member, the first propulsion member is fixedly connected to the second propulsion member by a fastener, the second propulsion member is movably connected to the movable knife by a positioning pin, and a groove for accommodating an elastic member is provided on the side of the second propulsion member facing the movable knife.

[0013] In some embodiments of the present application, there are multiple cutting grooves, and the multiple cutting grooves are arranged on the stationary knife side by side and at intervals along the moving direction of the movable knife.

[0014] In a second aspect, an embodiment of the present application provides a cutting device for a stator winding, wherein the stator winding includes a plurality of groups of hairpin wires arranged at intervals along its own circumferential direction, and the cutting device includes: a base; and a cutter mechanism of each embodiment of the present application, which is arranged on the base, and a movable knife of the cutter mechanism can move along the radial direction of the stator winding to shear the end of at least one group of hairpin wires.

[0015] In some embodiments of the present application, the cutting device also includes a rotating disk, which is rotatably connected to the base and is arranged around the outer peripheral side of the cutting mechanism. The rotating disk is provided with a cam groove extending along its own circumference, and the distance between the cam groove and the rotation center of the rotating disk gradually changes along the circumference; the cutting mechanism includes a propulsion assembly, and a cam that can be accommodated in the cam groove is provided at one end of the propulsion assembly away from the moving knife. When the rotating disk rotates, the moving knife can be pushed toward the rotation center by the propulsion assembly to cut the end of at least one group of hairpin wires.

[0016] In some embodiments of the present application, the cutting device further includes a first driving device, the first driving device is connected to the base, and the output end of the first driving device is used to drive the rotating disk to rotate relative to the base.

[0017] In some embodiments of the present application, there are multiple cutter mechanisms, and the multiple cutter mechanisms are arranged on the cutter disk at intervals along the circumferential direction; a plurality of cam grooves are arranged on the rotating disk, and the plurality of cam grooves are arranged in a one-to-one correspondence with the plurality of cutter mechanisms.

[0018] In some embodiments of the present application, the cutting device also includes a turntable, a cutting disc and a second drive device. The turntable is rotatably connected to the base, the rotating disc and the cutting disc are coaxially arranged with the turntable and fixedly connected, the cutting mechanism is located on the side of the cutting disc away from the turntable, the second drive device is connected to the base, and the output end of the second drive device is connected to the turntable to drive the cutting disc and the rotating disc to rotate together through the turntable.

[0019] In some embodiments of the present application, the cutting device also includes a third driving device, which includes a retractable connecting rod, which is arranged at the rotation center of the rotating disk; the cutter mechanism includes an anti-backlash assembly, which includes a driving member, and the output end of the connecting rod is connected to the driving members of multiple cutter mechanisms, so as to drive the multiple driving members to rotate together, so as to drive the stationary knives of the multiple cutter mechanisms to move in a direction away from the rotation center.

[0020] In some embodiments of the present application, the cutting disc, the turntable and the base together form a hollow channel around the connecting rod, the receiving slot of the support frame of the cutting mechanism is connected to the hollow channel, and the hollow channel is used to discharge the end of the cut hairpin wire.

[0021] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. In addition, the same reference numerals are used throughout the accompanying drawings to represent the same components. Among them: Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. In addition, the same reference numerals are used throughout the accompanying drawings to represent the same components. Among them: Figure 1 A schematic diagram of the three-dimensional structure of a cutting mechanism according to an embodiment of the present application; Figure 2 for Figure 1 A cross-sectional view of the cutter mechanism shown along direction AA; Figure 3 for Figure 2 Schematic diagram of the structure along direction B; Figure 4 A schematic diagram showing the structure of a stator winding according to an embodiment of the present application is shown; Figure 5 Show Figure 4 A schematic diagram of the structure of the bottom surface of the stator winding shown; Figure 6 A schematic diagram of the structure of a cutting device according to an embodiment of the present application; Figure 7 for Figure 6 A schematic diagram of the structure of the cutting device shown in the top view; Figure 8 for Figure 6 A partial cross-sectional view of the cutting device shown.

[0023] The reference numerals in the accompanying drawings represent the following: 1000, cutting device; 210, stator winding; 211, hairpin wire; 211a, U-shaped wire; 211b, I-shaped wire; 212, stator core; 213, stator slot; 100, cutter mechanism; 200, base; 300, turntable; 400, rotating disk; 401, cam groove; 401a, first end; 401b, second end; 500, first drive device; 600, cutter disk; 700, second drive device; 800, third drive device; 801, connecting rod; 802, guide member; 803, cylinder; 900, hollow channel; 1. Support frame; 10. Target object; 11. Receiving slot; 2. Static knife; 21. Grooving; 3. Anti-backlash assembly; 31. Sliding member; 311. Hanging portion; 312. Driving portion; 32. Driving member; 321. Connecting rod portion; 322. Rotating portion; 3221. Abutting portion; 3222. Rotating shaft; 33. Resetting member; 4. Moving knife; 42. Exit end; 5. Propelling assembly; 51. First propulsion member; 52. Second propulsion member; 521. Groove; 53. Fastener; 54. Positioning pin; 55. Cam; 6. elastic member; 7. pressure plate; 71. guide groove; 72. slide groove. DETAILED DESCRIPTION

[0024] The exemplary embodiments of the present application will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present application are shown in the accompanying drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present application and to fully convey the scope of the present application to those skilled in the art.

[0025] It should be understood that the terms used herein are only for the purpose of describing specific example embodiments and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used herein may also be meant to include plural forms. The terms "include", "comprise", "contain", and "have" are inclusive, and therefore specify the existence of stated features, steps, operations, elements and / or parts, but do not exclude the existence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not interpreted as necessarily requiring them to be performed in the specific order described or illustrated, unless the execution order is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0026] Although the terms first, second, third, etc. can be used in the text to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teaching of the example embodiments.

[0027] 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, such as "inside", "outside", "inner side", "outer side", "below", "below", "above", "above", etc. Such spatial relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figure. For example, if the device in the figure is turned over, the element described as "below other elements or features" or "below other elements or features" will then 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 can be oriented otherwise (rotated 90 degrees or in other directions) and the spatial relative descriptors used in the text are interpreted accordingly.

[0028] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0029] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0030] Figure 1 is a schematic diagram of the three-dimensional structure of the cutting mechanism of an embodiment of the present application, Figure 2 for Figure 1 The cutter mechanism is shown in a cross-sectional view along the direction AA, Figure 3 for Figure 2 Schematic diagram of the structure along direction B.

[0031] See also Figures 1 to 3 The embodiment of the present application provides a cutting mechanism 100, including a support frame 1, a stationary knife 2, a backlash elimination component 3 and a movable knife 4.

[0032] The support frame 1 has a receiving groove 11, and the static knife 2 covers the receiving groove 11. The static knife 2 is provided with a cutting groove 21 connected with the receiving groove 11, and the cutting groove 21 is used to allow the end of the target object 10 to be inserted therein and penetrate into the receiving groove 11. The anti-backlash component 3 includes a sliding member 31 and a driving member 32. The sliding member 31 is movably connected to the support frame 1. The side of the sliding member 31 facing away from the support frame 1 is provided with a hanging part 311. The driving member 32 is pivotally connected to the hanging part 311, so that the driving member 32 can drive the sliding member 31 to abut against the static knife 2 and push the static knife 2 to move, so as to eliminate the gap between the target object 10 and the groove wall of the cutting groove 21. The movable knife 4 is movably arranged in the receiving groove 11, and the movable knife 4 can move toward the cutting groove 21 in a direction opposite to the moving direction of the static knife 2 to shear the end of the target object 10.

[0033] In this embodiment, the target object 10 can be a hairpin wire in the stator winding of a flat wire motor, or other pin parts. Taking the hairpin wire as an example, after the hairpin wire is inserted into the stator core and the end is twisted and formed, the excess part or uneven part of the end of the straight part needs to be cut flat to facilitate subsequent welding. In the related art, after the hairpin wire is inserted into the cutting groove of the tool, due to the gap between the hairpin wire and the groove wall of the cutting groove, the hairpin wire will be greatly deformed after the end is cut, affecting the product qualification rate of the subsequent welding process.

[0034] To this end, in the embodiment of the present application, the cutting mechanism 100, in addition to including a support frame 1, a stationary knife 2 and a movable knife 4, is also provided with a gap eliminating component 3, which is used to eliminate the gap between the target object 10 such as a hairpin wire and the groove wall of the cutting groove 21, thereby reducing the possibility of deformation of the end of the hairpin wire during the shearing process.

[0035] Specifically, the support frame 1 has a receiving groove 11 , the static knife 2 covers the receiving groove 11 , and the static knife 2 is provided with a cutting groove 21 connected to the receiving groove 11 , and the cutting groove 21 is used to insert the end of the hairpin wire into it and pass through the receiving groove 11 . The gap eliminating component 3 is arranged at one end of the support frame 1, and the gap eliminating component 3 includes a sliding member 31 and a driving member 32. A hanging portion 311 is arranged on the side of the sliding member 31 facing away from the support frame 1. The driving member 32 includes a connecting rod portion 321 and a rotating portion 322 connected in sequence. The rotating portion 322 includes a butt joint 3221 and a rotating shaft 3222 arranged on the butt joint 3221. The driving member 32 is pivotally connected to the hanging portion 311 through the rotating shaft 3222, so that the driving member 32 can pivot relative to the hanging portion 311, thereby driving the sliding member 31 to butt against the stationary knife 2 and push the stationary knife 2 to move, so that a side groove wall of the cutting groove 21 of the stationary knife 2 fits with the end of the hairpin wire, thereby eliminating the gap between the hairpin wire and the groove wall of the cutting groove 21. Then the movable knife 4 is movably arranged in the accommodating groove 11, and the movable knife 4 can move toward the cutting groove 21 in the direction opposite to the moving direction of the stationary knife 2, so as to ensure that the hairpin wire will not shake in the cutting groove 21 during the process of shearing the end of the hairpin wire, thereby reducing the possibility of deformation of the end of the hairpin wire during the shearing process.

[0036] In addition, the cutting groove 21 is connected to the accommodating groove 11. The cutting groove 21 can accommodate the ends of hairpin wires with different cross-sectional areas, and the accommodating groove 11 can accommodate the ends of hairpin wires with different lengths. Therefore, the cutter mechanism 100 can cut the ends of hairpin wires of various sizes, thereby expanding the scope of application of the cutter mechanism 100.

[0037] According to the cutting mechanism 100 provided in the embodiment of the present application, it includes a support frame 1 with a receiving groove 11, a stationary knife 2 covering the receiving groove 11, a moving knife 4 movably arranged in the receiving groove 11, and a gap-eliminating component 3 movably connected to the support frame 1. One end of the gap-eliminating component 3 can abut against the stationary knife 2 and push the stationary knife 2 to move, so as to eliminate the gap between the target object 10 such as a hairpin wire and the groove wall of the cutting groove 21 of the stationary knife 2, thereby reducing the possibility of deformation of the end of the hairpin wire in the stator winding during the shearing process of the driven knife 4, and improving the product qualification rate of the subsequent welding process.

[0038] In some embodiments, the driving member 32 is arranged at a preset angle with the hanging portion 311 in the initial position. When the driving member 32 rotates relative to the hanging portion 311, the distance between the end of the driving member 32 away from the hanging portion 311 and the support frame 1 remains unchanged.

[0039] like Figure 3As shown, the driving member 32 is set at a preset angle θ with the hanging part 311 in the initial position, and the preset angle θ can be, for example, 120°~150°. The driving member 32 rotates relative to the hanging part 311 under the action of an external force, and the external force acts on the end of the driving member 32 away from the hanging part 311. The external force can be provided by manual operation of an operator or by other driving devices. Since the distance between the end of the driving member 32 away from the hanging part 311 and the support frame 1 remains unchanged, when the driving member 32 rotates relative to the hanging part 311, the driving sliding member 31 pushes the static knife 2 to move. Assuming that the length of the driving member 32 is L, and the rotation angle of the driving member 32 from the initial position is α, the distance d moved by the static knife 2 is not greater than the gap between the hairpin wire and the groove wall of the cutting groove 21, and the distance d satisfies the following conditions: d≤L×(1-cosα), where α =180°-θ.

[0040] Thus, the size of the preset angle θ can be calculated and can be selected according to the specific application scenario, which will not be elaborated herein.

[0041] In some embodiments, the backlash elimination assembly 3 further includes a compressible restoring member 33 , and the restoring member 33 is disposed between the support frame 1 and a side of the stationary knife 2 away from the sliding member 31 .

[0042] Optionally, the reset member 33 is a spring. The reset member 33 is assembled between the side of the stationary knife 2 away from the sliding member 31 and the support frame 1 with a certain preload force. When the hairpin wire is inserted into the cutting groove 21 of the stationary knife 2, one end of the gap elimination component 3 pushes the stationary knife 2 to move a certain distance to eliminate the gap between the hairpin wire and the groove wall of the cutting groove 21. At this time, the stationary knife 2 compresses the reset member 33, and then the movable knife 4 moves toward the cutting groove 21 in the opposite direction to the moving direction of the stationary knife 2 to shear the end of the hairpin wire. After the shearing is completed, the external force of the driving member 32 disappears, the movable knife 4 returns to its original position, and the reset member 33 stretches to restore to the initial assembly state, pushing the stationary knife 2 back to its original position.

[0043] In some embodiments, the cutting mechanism 100 also includes a pressure plate 7, which is arranged on the support frame 1. The pressure plate 7 is provided with a guide groove 71 for accommodating the static knife 2. One end of the pressure plate 7 is also provided with a slide groove 72 connected to the guide groove 71. The side of the sliding member 31 facing the support frame 1 is provided with a driving part 312 connected to the hanging part 311, and the driving part 312 is embedded in the slide groove 72 and abuts against the static knife 2.

[0044] like Figures 1 to 3 As shown, the pressure plate 7 is fixed to the support frame 1 by a plurality of fasteners. In order to facilitate the placement of the hairpin wires of the stator winding, the pressure plate 7 is hollowed out at both sides corresponding to the cutting slot 21 of the stationary knife 2 to avoid structural interference between the pressure plate 7 and the stator winding and damage to the stator winding.

[0045] The pressing plate 7 is provided with a guide groove 71 for accommodating the static knife 2. The guide groove 71 is a through groove that penetrates the pressing plate 7. The guide groove 71 is used to guide the static knife 2 to move in a preset direction to prevent the static knife 2 from deviating and causing the end of the hairpin wire to deform. One end of the pressing plate 7 is also provided with a slide groove 72 that is connected to the guide groove 71. The slide groove 72 is formed by a side surface of the pressing plate 7 facing the support frame 1 and is recessed inward by a certain thickness, so that the pressing plate 7 can limit the upward movement of the driving part 312 of the sliding member 31. The driving part 312 is embedded in the slide groove 72 and abuts against the static knife 2, so that the sliding member 31 can be driven to push the static knife 2 to move under the external force of the driving member 32.

[0046] In some embodiments, the cutting mechanism 100 further includes a propulsion assembly 5, which is movably connected to the support frame 1, and one end of the propulsion assembly 5 can extend into the receiving groove 11 and is fixedly connected to the movable knife 4 to drive the movable knife 4 to move.

[0047] like Figure 2 and Figure 3 As shown, the movable knife 4 is arranged in the receiving groove 11 of the support frame 1, one end of the propulsion assembly 5 can extend into the receiving groove 11 and be fixedly connected to the movable knife 4, and the movable knife 4 can be arranged at the top or upper part of one end of the propulsion assembly 5. Under the action of external force, the propulsion assembly 5 can push the movable knife 4 to move in the direction opposite to the moving direction of the static knife 2 to perform a shearing action. The external force can be provided by manual operation of the operator or by other driving devices. The structure of the propulsion assembly 5 has various forms, as long as one end of the propulsion assembly 5 can extend into the receiving groove 11 of the support frame 1 and be fixedly connected to the movable knife 4.

[0048] In some embodiments, the movable knife 4 is located on the side of the propulsion assembly 5 facing the stationary knife 2 , and an elastic member 6 is disposed between the propulsion assembly 5 and the movable knife 4 , and the elastic member 6 pushes the movable knife 4 to fit the stationary knife 2 .

[0049] Optionally, the number of elastic members 6 may be at least two, and at least two elastic members 6 are disposed at intervals between the propulsion assembly 5 and the movable blade 4. As described above, the movable blade 4 can shear the end of the hairpin wire extending into the cutting groove 21 to the receiving groove 11. In order to prevent the end of the hairpin wire from deforming too much during the shearing process, the movable blade 4 and the stationary blade 2 need to be arranged in contact with each other so that the movable blade 4 can cut the root from the contact surface of the two. The elastic member 6 can push the movable blade 4 to be arranged in contact with the stationary blade 2 to eliminate the gap between the contact surfaces of the movable blade 4 and the stationary blade 2.

[0050] In some embodiments, the propulsion assembly 5 includes a first propulsion member 51 and a second propulsion member 52 which are stacked. The movable knife 4 is located on the side of the second propulsion member 52 away from the first propulsion member 51. The first propulsion member 51 is fixedly connected to the second propulsion member 52 via a fastener 53. The second propulsion member 52 is movably connected to the movable knife 4 via a positioning pin 54. A groove 521 for accommodating the elastic member 6 is provided on the side of the second propulsion member 52 facing the movable knife 4.

[0051] like Figure 2 and Figure 3 As shown, the first pusher 51 and the second pusher 52 are stacked and arranged in the receiving groove 11 of the support frame 1, and the movable knife 4 is arranged on the side of the second pusher 52 away from the first pusher 51, and the second pusher 52 is provided with a groove 521 for accommodating the elastic member 6 on the side facing the movable knife 4, and the number of the grooves 521 is the same as the number of the elastic members 6. Wherein, the movable knife 4 can move relative to the propulsion assembly 5 in the vertical direction under the action of the elastic member 6, so that the movable knife 4 is arranged in contact with the stationary knife 2. Specifically, the first pusher 51 is fixedly connected with the second pusher 52 through a fastener 53, and the fastener 53 is a bolt. The second pusher 52 is movably connected with the movable knife 4 through a positioning pin 54, and the positioning pin 54 is a T-shaped pin. The second pusher 52 is provided with a T-shaped groove, and the T-shaped groove includes a large hole and a small hole arranged along the axial direction. The nail cap of the T-shaped pin is arranged in the large hole of the T-shaped groove, and the nail rod of the T-shaped pin is arranged in the small hole of the T-shaped groove and extends into the movable knife 4. Among them, the thickness of the nail cap is smaller than the depth of the large hole of the T-groove, so that the positioning pin 54 can be moved axially, so that the movable knife 4 can be pushed to fit the stationary knife 2 under the action of the elastic member 6 to eliminate the gap between the fitting surfaces of the movable knife 4 and the stationary knife 2.

[0052] In some embodiments, there are multiple cutting grooves 21 , and the multiple cutting grooves 21 are arranged on the stationary knife 2 side by side and at intervals along the moving direction of the movable knife 4 .

[0053] like Figure 2 As shown, optionally, each hairpin wire 211 has two ends, and a total of eight ends need to be cut. In one example, the number of the slots 21 is four, and the four slots 21 are arranged side by side and at intervals on the stationary knife 2 along the moving direction of the movable knife 4. When the movable knife 4 moves, the ends of the four hairpin wires can be cut off one by one, effectively ensuring the flatness of the ends of the hairpin wires after cutting, and improving the cutting efficiency. The number of the slots 21 can also be one, two, three or more, and the number of ends that need to be cut will decrease or increase accordingly, depending on the structure of the stator winding.

[0054] Figure 4 A schematic diagram showing the structure of the stator winding of an embodiment of the present application is shown. Figure 5 Show Figure 4 A schematic structural diagram of the bottom surface of the stator winding is shown.

[0055] See also Figure 4 and Figure 5 The stator winding 210 includes a stator core 212 and at least two windings arranged on the stator core 212, each winding includes a plurality of hairpin wires 211 arranged at intervals along the circumferential direction, and the plurality of hairpin wires 211 of at least two windings are aligned in the radial direction, so that the plurality of hairpin wires 211 are arranged in a group at intervals along the radial direction, and the plurality of groups of hairpin wires 211 are arranged at intervals along the circumferential direction. The hairpin wire 211 may include a U-shaped wire 211a, which includes a bending portion and two straight portions, wherein the bending portion is punched into a preset shape by a punching mechanism, and the two straight portions are parallel to each other and connected to the two ends of the bending portion to form a "U"-shaped structure. The hairpin wire 211 also includes an I-shaped wire 211b, which includes a straight portion. A straight portion of a U-shaped wire 211a and a straight portion of an I-shaped wire 211b can be inserted into a corresponding stator slot 213 of the stator core 212, or a straight portion of each of two radially adjacent U-shaped wires 211a can be inserted into a corresponding stator slot 213, so as to weave multiple groups of hairpin wires 211 into a stator winding 210. In one example, as Figure 5 As shown, a group of hairpin wires 211 includes four hairpin wires 211 spaced apart in the radial direction, and the ends of the two straight portions of each hairpin wire 211 need to be cut, for a total of eight ends.

[0056] The manufacturing process of the stator winding 210 mainly includes inserting insulating paper, inserting hairpin wires, twisting the ends of the hairpin wires, cutting the ends, welding the ends, etc., wherein after the hairpin wires 211 are inserted into the stator core 212 and the ends are twisted and formed, the excess or uneven parts of the ends of the hairpin wires 211 need to be uniformly cut flat by the cutting mechanism 100 to facilitate welding.

[0057] Figure 6 This is a schematic structural diagram of a stator winding trimming device according to an embodiment of the present application.

[0058] See also Figure 6 The embodiment of the present application also provides a cutting device 1000 for stator windings. The stator winding 210 includes a plurality of groups of hairpin wires 211 arranged at intervals along its own circumferential direction. The cutting device 1000 includes: a base 200 and a cutter mechanism 100 of each embodiment of the present application. The cutter mechanism 100 is arranged on the base 200. The movable knife 4 of the cutter mechanism 100 can move along the radial direction of the stator winding 210 to cut the end of at least one group of hairpin wires 211.

[0059] In one example, the stator winding 210 is rotatably connected to the rotating member, and the rotating member can be used to drive the stator winding 210 to rotate along its own circumferential direction. A cutter mechanism 100 is fixed on the base 200 along the radial direction of the stator winding 210, and the movable knife 4 of the cutter mechanism 100 can cut the ends of a group of hairpin wires 211 at a time. When the rotating member drives the stator winding 210 to rotate by a first angle, the ends of another group of hairpin wires 211 can be aligned with the cutter mechanism 100, so as to cut the ends of another group of hairpin wires 211. By gradually rotating a certain angle, the ends of multiple groups of hairpin wires 211 can be cut one by one. Among them, multiple hairpin wires 211 in a group of hairpin wires 211 are distributed at intervals along the radial direction of the stator winding 210. The rotating member can be rotatably connected to the base 200, or it can be a rotating member of other equipment located above the cutting device 1000.

[0060] In another example, Figure 6 As shown, there are multiple cutter mechanisms 100, and the multiple cutter mechanisms 100 are arranged on the base 200 at intervals along the circumferential direction. The movable knife 4 of each cutter mechanism 100 can move along the radial direction of the stator winding 210, wherein the number of groups of hairpin wires 211 is an integral multiple of the number of cutter mechanisms 100. The multiple cutter mechanisms 100 can rotate relative to the base 200, while the stator winding 210 does not need to rotate, and the multiple cutter mechanisms 100 can cut the ends of multiple groups of hairpin wires 211 at one time; then the multiple cutter mechanisms 100 rotate at a certain angle relative to the base 200, and the multiple cutter mechanisms 100 can cut the ends of another multiple groups of hairpin wires 211 at one time, until the ends of all hairpin wires 211 are completely cut, thereby improving the cutting efficiency.

[0061] Figure 7 for Figure 6 A schematic diagram of the top view of the cutting device is shown.

[0062] In some embodiments, the cutting device 1000 also includes a rotating disk 400, which is rotatably connected to the base 200 and is arranged around the outer peripheral side of the cutting mechanism 100. The rotating disk 400 is provided with a cam groove 401 extending along its own circumference, and the distance between the cam groove 401 and the rotation center of the rotating disk 400 gradually changes; the cutting mechanism 100 includes a propulsion assembly 5, and the propulsion assembly 5 is provided with a cam 55 that can be accommodated in the cam groove 401 at one end away from the moving knife 4. When the rotating disk 400 rotates, the propulsion assembly 5 can push the moving knife 4 toward the rotation center to cut the end of at least one group of hairpin wires 211.

[0063] See again Figure 6 and Figure 7The center of the rotating disk 400 is hollowed out and arranged around the outer peripheral side of the cutting mechanism 100, and the rotating disk 400 is rotatably connected to the base 200. The rotating disk 400 is provided with a cam groove 401 extending along its own circumference, and the end of the propulsion assembly 5 of the cutting mechanism 100 away from the movable knife 4 is provided with a cam 55 that can be accommodated in the cam groove 401. The cam 55 can be rotatably connected to the end of the propulsion assembly 5 away from the movable knife 4, thereby improving the rotation flexibility of the cam 55. In this way, when the cutting mechanism 100 remains stationary and the rotating disk 400 rotates relative to the cutting mechanism 100, the cam 55 can move along the cam groove 401 while rotating around its own circumference, thereby reducing the friction between the cam 55 and the groove wall of the cam groove 401.

[0064] like Figure 7 As shown, the cam groove 401 is an arc-shaped groove, and the distance between the first end 401a and the rotation center of the rotating disk 400 is relatively far, while the distance between the remaining positions and the rotation center of the rotating disk 400 gradually becomes closer along the arc length direction of the cam groove 401, so that the distance between the second end 401b and the rotation center of the rotating disk 400 is the shortest. The distance difference between the first end 401a and the second end 401b of the cam groove 401 and the rotation center of the rotating disk 400 is the distance that the propulsion assembly 5 drives the movable knife 4 to move along the radial direction of the rotating disk 400.

[0065] When the rotating disk 400 rotates clockwise relative to the cutting mechanism 100, the cam 55 gradually rotates from the first end 401a to the second end 401b in the cam groove 401, and the combination of the cam 55 and the cam groove 401 can provide thrust for the propulsion assembly 5, thereby pushing the propulsion assembly 5 to drive the movable knife 4 to move along the radial direction of the rotating disk 400 toward the rotation center, and then cut the ends of a corresponding group of hairpin wires 211 one by one. When the rotating disk 400 rotates counterclockwise relative to the cutting mechanism 100, the cam 55 gradually rotates from the second end 401b to the first end 401a in the cam groove 401, and the combination of the cam 55 and the cam groove 401 can provide pulling force for the propulsion assembly 5, thereby pulling the propulsion assembly 5 to drive the movable knife 4 to move along the radial direction away from the rotation center, completing the knife retracting action.

[0066] In some embodiments, the planing device 1000 further includes a first driving device 500 , which is connected to the base 200 , and an output end of the first driving device 500 is used to drive the rotating disk 400 to rotate relative to the base 200 .

[0067] like Figure 6 and Figure 7As shown, the first driving device 500 may include a first motor and a first transmission mechanism, and the first transmission mechanism may be any one of a gear transmission assembly, a belt transmission assembly, and a chain transmission assembly. Taking the gear transmission assembly as an example, the first transmission mechanism includes a driving gear and a passive gear that mesh with each other, and the rotating disk 400 is provided with a plurality of gear teeth as passive gears at intervals along its outer circumference. The first motor may be a servo motor or a stepping motor, and the output end of the first motor is connected to the driving gear to drive the rotating disk 400 to rotate, thereby driving the movable knife 4 to shear the end of the hairpin wire 211. The first driving device 500 may also include an outer cover, which covers the gear teeth of the driving gear and part of the rotating disk 400 to prevent foreign matter from entering the gear teeth meshing area and damaging the gear set.

[0068] It is understandable that when the first transmission mechanism is a belt transmission assembly or a chain transmission assembly, the rotating disk 400 can serve as a passive pulley or a passive sprocket, and the rotating disk 400 is driven to rotate by a conveyor belt or a conveyor chain, which will not be elaborated.

[0069] In some embodiments, there are multiple cutter mechanisms 100, and the multiple cutter mechanisms 100 are arranged on the cutter disk 600 at intervals along the circumferential direction; a plurality of cam grooves 401 are arranged on the rotating disk 400, and the plurality of cam grooves 401 are arranged one-to-one correspondingly to the plurality of cutter mechanisms 100.

[0070] like Figure 7 As shown, there are six cutter mechanisms 100, and the six cutter mechanisms 100 are arranged on the cutter disk 600 at intervals along the circumferential direction, and the rotating disk 400 is correspondingly provided with six cam grooves 401, so that the six cutter mechanisms 100 can cut the ends of 6 groups of hairpin wires 211 at the same time, thereby improving the cutting efficiency. Assuming that the stator winding 210 has more groups of hairpin wires 211 arranged at intervals along its own circumferential direction, such as 12 groups, 18 groups, etc., the six cutter mechanisms 100 can simultaneously rotate to the second angle and continue to cut the ends of the next 6 groups of hairpin wires 211. To this end, the cutter mechanism 100 and the rotating disk 400 need to be able to rotate at the same time to achieve this.

[0071] Figure 8 for Figure 6 A partial cross-sectional view of the cutting device shown.

[0072] In some embodiments, the cutting device 1000 also includes a turntable 300, a cutting disc 600 and a second driving device 700. The turntable 300 is rotatably connected to the base 200. The rotating disc 400 and the cutting disc 600 are both coaxially arranged with the turntable 300 and fixedly connected. The cutting mechanism 100 is located on the side of the cutting disc 600 away from the turntable 300. The second driving device 700 is connected to the base 200. The output end of the second driving device 700 is connected to the turntable 300 to drive the cutting disc 600 and the rotating disc 400 to rotate together through the turntable 300.

[0073] like Figure 8 As shown, the turntable 300 and the base 200 are rotatably connected via a bearing, the rotating disk 400 and the cutting disk 600 are coaxially arranged and fixedly connected with the turntable 300, the cutting mechanism 100 is fixed on the cutting disk 600, and the rotating disk 400 is arranged around the outer peripheral side of the cutting mechanism 100. When the second driving device 700 drives the turntable 300 to rotate, the rotating disk 400 and the cutting disk 600 can be driven to rotate together. The second driving device 700 may include, for example but not limited to, a servo motor or a stepping motor, etc. In some embodiments, the second driving device 700 may also include a reduction device, which is connected to the output end of the servo motor or the stepping motor, and the reduction device may be a gear set, a belt drive assembly, or a chain drive assembly, etc.

[0074] Assume that the stator winding 210 has more groups of hairpin wires 211 arranged at intervals along its own circumferential direction, and the number of groups of hairpin wires 211 is an integer multiple of the number of cutter mechanisms 100. For example, the stator winding 210 has 12 groups of hairpin wires 211, each group of hairpin wires 211 has 4 hairpin wires 211 arranged at intervals along the radial direction, and there are a total of 48 hairpin wires 211. Then, the stator core 212 is correspondingly provided with 48 stator slots. The cutting device 1000 includes 6 cutter mechanisms 100 arranged at intervals along the circumferential direction. When the first driving device 500 is started alone, the rotating disk 400 can rotate at a first angle relative to the cutter disk 600, so that the 6 cutter mechanisms 100 can cut the ends of the 6 groups of hairpin wires 211 at the same time. Then, the second driving device 700 is started, and the turntable 300 is driven to rotate by the second driving device 700, which can drive the rotating disk 400 and the cutting disk 600 to rotate together at a second angle. The second angle is, for example, 7.5°, which is determined according to the size and arrangement density of the cam groove 401, so that the ends of another 6 groups of hairpin wires 211 can continue to be sheared, and finally all the ends are sheared to facilitate the subsequent welding process.

[0075] In some embodiments, the cutting device 1000 also includes a third driving device 800, which includes a retractable connecting rod, which is arranged at the rotation center of the rotating disk 400; the cutting mechanism 100 includes an anti-backlash component 3, which includes a driving member 32, and the output end of the connecting rod is connected to the driving members 32 of multiple cutting mechanisms 100, so as to drive the multiple driving members 32 to rotate together, so that the stationary knives 2 of the multiple cutting mechanisms 100 move in a direction away from the rotation center.

[0076] See also Figure 8As mentioned above, before the moving knife 4 of the cutting mechanism 100 performs the shearing operation, the gap between the hairpin wire 211 and the groove wall of the cutting groove 21 of the stationary knife 2 needs to be eliminated by the gap eliminating component 3. When the trimming device 1000 includes multiple cutting mechanisms 100, the gaps between multiple groups of hairpin wires 211 and the groove wall of the cutting groove 21 can be eliminated simultaneously by the third driving device 800.

[0077] Specifically, the third driving device 800 includes a cylinder 803 and a connecting rod 801 connected to the output end of the cylinder 803. The cylinder 803 is connected to the base 200 through a fixed plate. The output end of the cylinder 803 is used to drive the connecting rod 801 to extend and retract along the axial direction. The connecting rod 801 passes through the rotation center of the turntable 300 and the cutter disc 600 from the bottom of the base 200. A movable guide member 802 is sleeved on the outer peripheral side of the output end of the connecting rod 801. The guide member 802 is fixedly connected to the cutter disc 600. The guide member 802 is used to guide the connecting rod 801 to extend and retract along the axial direction to prevent the connecting rod 801 from being offset. The outer periphery of one end of the connecting rod 801 extending from the guide member 802 is respectively connected to the driving members 32 of the multiple cutter mechanisms 100. In this way, when the cylinder 803 drives the connecting rod 801 to extend toward the cutting disc 600, the plurality of driving members 32 can be pushed to rotate together, thereby simultaneously eliminating the gaps between the plurality of hairpin wires 211 and the groove wall of the cutting groove 21.

[0078] In some embodiments, the cutting disc 600, the turntable 300 and the base 200 together form a hollow channel 900 around the connecting rod 801, and the receiving groove 11 of the support frame 1 of the cutting mechanism 100 is connected to the hollow channel 900, and the hollow channel 900 is used to discharge the end of the cut hairpin wire 211.

[0079] like Figure 3 and Figure 8 As shown, the support frame 1 of the cutter mechanism 100 has a receiving slot 11, and the cutter disc 600, the turntable 300 and the base 200 together form a hollow channel 900 around the connecting rod 801, and the receiving slots 11 of multiple cutter mechanisms 100 are all connected to the hollow channel 900. In this way, the ends of the hairpin wires 211 cut by the multiple cutter mechanisms 100 can fall from the receiving slots 11 of the respective support frames 1 into the hollow channel 900, and a collection bin can be provided below the hollow channel 900 to facilitate timely cleaning of the cut waste.

[0080] Therefore, the stator winding cutting device 1000 provided in the embodiment of the present application adopts multiple cutting knife mechanisms 100 of each embodiment of the present application, which can not only reduce the possibility of deformation of the end of the hairpin wire in the stator winding during the shearing process of the passive knife 4, but also improve the end shearing efficiency of the stator winding and improve the product qualification rate of the subsequent welding process.

[0081] The above is only a preferred specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A cutting mechanism, characterized in that: include: A support frame having a receiving slot; a stationary knife, covering the receiving groove, the stationary knife being provided with a cutting groove communicating with the receiving groove, the cutting groove being used for inserting an end of the target object therein and penetrating into the receiving groove; A clearance eliminating assembly, comprising a sliding member and a driving member, wherein the sliding member is movably connected to the support frame, a hanging portion is provided on a side of the sliding member away from the support frame, and the driving member is pivotally connected to the hanging portion, so that the driving member can drive the sliding member to abut against the static knife and push the static knife to move, so as to eliminate the clearance between the target object and the groove wall of the cut groove; as well as The movable knife is movably disposed in the accommodating groove, and the movable knife can move toward the cutting groove in a direction opposite to the moving direction of the stationary knife to shear the end of the target object.

2. The cutting mechanism according to claim 1, characterized in that: The driving member is arranged at a preset angle with the hanging portion in an initial position, and when the driving member rotates relative to the hanging portion, the distance between the end of the driving member away from the hanging portion and the support frame remains unchanged.

3. The cutting mechanism according to claim 1, characterized in that: The anti-backlash assembly further comprises a compressible reset member, which is arranged between the side of the stationary knife away from the sliding member and the support frame.

4. The cutting mechanism according to claim 1, characterized in that: The cutting knife mechanism also includes a pressure plate, which is arranged on the support frame. The pressure plate is provided with a guide groove for accommodating the static knife. One end of the pressure plate is also provided with a slide groove connected to the guide groove. The side of the sliding member facing the support frame is provided with a driving part connected to the hanging part, and the driving part is embedded in the slide groove and abuts against the static knife.

5. The cutting mechanism according to claim 1, characterized in that: The cutting knife mechanism also includes a propulsion assembly, which is movably connected to the support frame. One end of the propulsion assembly can extend into the accommodating groove and is fixedly connected to the movable knife to drive the movable knife to move.

6. The cutting mechanism according to claim 5, characterized in that: The movable knife is located on a side of the propulsion assembly facing the stationary knife. An elastic member is provided between the propulsion assembly and the movable knife. The elastic member is used to push the movable knife to fit the stationary knife.

7. The cutting mechanism according to claim 6, characterized in that: The propulsion assembly includes a first propulsion member and a second propulsion member arranged in a stacked manner. The movable knife is located on a side of the second propulsion member away from the first propulsion member. The first propulsion member is fixedly connected to the second propulsion member via a fastener, and the second propulsion member is movably connected to the movable knife via a positioning pin. A groove for accommodating the elastic member is provided on the side of the second propulsion member facing the movable knife.

8. The cutter mechanism according to claim 1, characterized in that: The number of the cutting grooves is multiple, and the multiple cutting grooves are arranged on the stationary knife side by side and at intervals along the moving direction of the movable knife.

9. A cutting device for stator windings, the stator windings comprising a plurality of groups of hairpin wires spaced apart along the circumference of the stator windings, characterized in that: The cutting device comprises: Base; and The cutter mechanism according to any one of claims 1 to 8 is arranged on the base, and the movable knife of the cutter mechanism can move along the radial direction of the stator winding to shear the ends of at least one group of the hairpin wires.

10. The stator winding trimming device according to claim 9, characterized in that: The cutting device further comprises a rotating disk, which is rotatably connected to the base and is disposed around the outer circumference of the cutting mechanism. A cam groove extending along its circumference is disposed on the rotating disk, and a distance between the cam groove and the rotation center of the rotating disk gradually changes along the circumference. The cutting mechanism includes a propulsion assembly, and a cam capable of being accommodated in the cam groove is arranged at one end of the propulsion assembly away from the movable knife. When the rotating disk rotates, the movable knife can be pushed toward the rotation center by the propulsion assembly to cut the ends of at least one group of the hairpin wires.

11. The stator winding trimming device according to claim 10, characterized in that: The cutting device further comprises a first driving device, which is connected to the base, and an output end of the first driving device is used to drive the rotating disk to rotate relative to the base.

12. The stator winding trimming device according to claim 10 or 11, characterized in that: There are multiple cutter mechanisms, and the multiple cutter mechanisms are arranged on the base at intervals along the circumferential direction; The rotating disk is provided with a plurality of cam grooves, and the plurality of cam grooves are arranged in one-to-one correspondence with the plurality of cutting mechanisms.

13. The stator winding trimming device according to claim 12, characterized in that: The cutting device also includes a turntable, a cutting disc and a second driving device. The turntable is rotatably connected to the base. The rotating disc and the cutting disc are coaxially arranged with the turntable and fixedly connected. The cutting mechanism is located on the side of the cutting disc away from the turntable. The second driving device is connected to the base, and the output end of the second driving device is connected to the turntable to drive the cutting disc and the rotating disc to rotate together through the turntable.

14. The stator winding trimming device according to claim 13, characterized in that: The cutting device further comprises a third driving device, wherein the third driving device comprises a retractable connecting rod, and the connecting rod is arranged at the rotation center of the rotating disk; The cutter mechanism includes an anti-backlash component, which includes a driving member. The output end of the connecting rod is connected to the driving members of multiple cutter mechanisms, and is used to drive the multiple driving members to rotate together, so that the stationary knives of the multiple cutter mechanisms move in a direction away from the rotation center.

15. The stator winding trimming device according to claim 14, characterized in that: The cutter disc, the turntable and the base together form a hollow channel around the connecting rod. The receiving groove of the support frame of the cutter mechanism is connected to the hollow channel, and the hollow channel is used to discharge the cut end of the hairpin wire.

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