Step-by-step clamping tool

Abstract

A step-by-step clamping tool, comprising a fixing base (1), and a lower turntable (2) and an upper turntable (3) which are rotationally connected to the fixing base, wherein a clamping sheet (6) is provided above the upper turntable, the clamping sheet is slidably connected to the fixing base, and the sliding direction of the clamping sheet relative to the fixing base is along the direction of the radial line of the upper turntable; a plurality of first clamping holes (21) are provided in the lower turntable, a plurality of second clamping holes (31) are provided in the upper turntable, and a plurality of clamping holes (61) are provided in the clamping sheet; ends of two flat wires pass through a first clamping hole, a second clamping hole and a clamping hole; the upper turntable and the lower turntable are connected to a driving device (5) for driving the upper turntable and the lower turntable to rotate in opposite directions; the clamping sheet is connected to a clamping device (7) for driving the clamping sheet to move in the direction of the radial line of the upper turntable; and the driving device drives the inner wall of the first clamping hole and the inner wall of the second clamping hole that are relatively close to each other to align side walls of the two flat wires, and then the clamping device drives the clamping sheet to abut against the ends of the two flat wires. The step-by-step clamping tool can align the side walls of the ends of the two flat wires first and then clamp and tightly abut against the ends of the two flat wires, thereby reducing the resistance borne by the flat wires during extrusion.

Description

Step-by-step clamping fixture

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on February 2, 2024, with application number 202410150906.5, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the technical field of flat wire motor production equipment, for example, to a step-by-step clamping tool. Background Art

[0003] Flat wire motors have a high power density and are primarily used in new energy vehicles. They are small in size, have a high slot fill rate, and have good thermal conductivity. After the flat wires are inserted into the stator of the flat wire motor, the ends of the flat wires need to be welded to complete the electrical connection through welding. Flat wires are inserted more frequently into the stator, and the flat wires are usually 4, 6, 8, or more layers. During production, the flat wires are inserted into the slots of the stator and then twisted as required to bring the ends of the flat wires in different slots closer together, and then the two adjacent ends are welded. When twisting the flat wires, due to the high hardness of the material and the lack of twisting precision, the ends of the two flat wires cannot fit together exactly, causing the ends of the flat wires to be misaligned or a gap to form between the ends of the two flat wires. Therefore, before welding the ends of the flat wires, the ends of the two flat wires need to be clamped to align the ends of the two flat wires.

[0004] The related art discloses a flat wire welding positioning mechanism, including a positioning base, a positioning disk and a rotating disk, a plurality of wire clamping holes are provided on the positioning disk at intervals, a wire clamping seat is slidably installed in each wire clamping hole, each wire clamping seat is connected to the rotating disk, and the rotating disk is configured to drive each wire clamping seat to move back and forth in the corresponding wire clamping hole, so that each wire clamping seat cooperates with the relative wire clamping hole to clamp the flat wire, and the wire clamping seat approaches the side wall of the wire clamping hole to clamp the ends of the two flat wires, so that the ends of the two flat wires can be pressed against each other, and at the same time, in order to align the ends of the two flat wires, the wire clamping seat needs to be provided with an oblique opening configured to align the ends of the two flat wires. When in use, the side wall of the end of the flat wire is squeezed by the side of the oblique opening, so that the end of the flat wire moves to the middle position of the oblique opening, so that the end side walls of the two flat wires can be aligned and clamped.

[0005] However, an insulating layer is usually provided on the outer wall of the flat wire. When the two sides of the flat wire are aligned and the ends of the two flat wires abut against each other, the friction between the side wall of the flat wire and the wire clamping seat is large, which can easily damage the insulating layer on the outer wall of the flat wire.

[0006] Summary of the Invention

[0007] In order to align the side walls of the ends of the flat wires before the ends of the two flat wires abut against each other, the present application provides a step-by-step clamping tool.

[0008] The axle up and down groove at two ends embeds respectively in two guide rails up and down of being made up of the groove on the attachment piece, and the tooth on the attachment piece is meshed with tooth on upper sprocket wheel, the lower sprocket.

[0009] In one or more embodiments, a moving block is connected to the clamping plate, and the moving block is slidingly arranged with the clamping plate, and the sliding direction of the moving block relative to the clamping plate is along the radial direction of the upper turntable. A spring is arranged between the moving block and the clamping plate, and the spring is parallel to the sliding direction of the clamping plate. The clamping device drives the clamping plate to move along the radial direction of the upper turntable through the moving block.

[0010] In one or more embodiments, the clamping device includes a clamping disk, which is rotatably connected to a fixed seat and has a plurality of inclined grooves on the clamping disk, with the inclined grooves gradually approaching the center direction of the upper turntable from one end to the other. A connecting pin is fixedly provided on the moving block, and the connecting pin is inserted into the inclined groove and slides along the inclined groove. The clamping disk drives the moving block to slide by rotating.

[0011] In one or more embodiments, a support frame is fixedly provided on the upper surface of the fixed seat, and the upper turntable, lower turntable and clamping plate are all rotatably connected to the fixed seat through the support frame. A pressure plate is provided on the upper surface of the support frame, and the pressure plate is configured to limit the axial movement of the upper turntable, lower turntable and clamping plate.

[0012] In one or more embodiments, the driving device includes a slider and two driving rings, which are rotatably connected to a fixed seat, and the two driving rings are mounted on each other. The lower turntable is fixed on the inner driving ring, and the upper turntable is fixed on the outer driving ring. Connecting ears are fixed on the side walls of the two driving rings, and a long groove is provided on the connecting ear. The slider is slidably connected to the fixed seat along the radial direction of the upper turntable. The two long grooves are inclined to the sliding direction of the slider and the inclination angles are equal. A connecting column is fixed on the slider and penetrates into the long groove.

[0013] In one or more embodiments, the first clamping hole and the second clamping hole are both rectangular holes, and when a pair of relatively close inner walls of the first clamping hole and the second clamping hole are parallel, the first side walls of the two flat wires are aligned.

[0014] In one or more embodiments, an extension block is fixedly provided on the inner wall of the first clamping hole, one side of the extension block is fixed to the lower turntable, and the other side extends upward into the second clamping hole of the upper turntable, and when the upper turntable and the lower turntable clamp the side wall of the flat wire relative to each other, the extension block is in the position of the second clamping hole and abuts against the side wall of the flat wire.

[0015] In one or more embodiments, an extension block is fixedly provided on the inner wall of the first clamping hole, and the inner wall of the first clamping hole where the extension block is located is the inner wall of the first clamping hole for cooperating with the second clamping hole to clamp the end of the flat wire. One side of the extension block is fixed to the lower turntable, and the other side extends upward into the second clamping hole of the upper turntable, and when the upper turntable and the lower turntable clamp the side wall of the flat wire, the extension block is in the position of the second clamping hole and abuts against the first side wall of the flat wire.

[0016] In one or more embodiments, an extension strip is fixedly provided on the clamping plate, the width of the extension strip is smaller than the width of a flat wire, one end of the extension strip extends downward into the second clamping hole, and the extension strip is fixed in the middle of the side wall of the clamping hole configured to clamp the flat wire, and the extension strip is configured to cooperate with the second clamping hole to clamp the end of the flat wire.

[0017] In one or more embodiments, the cross section of the extension strip is configured to be an isosceles trapezoid, and the upper base of the isosceles trapezoid of the extension strip faces the middle of the clamping hole.

[0018] In one or more embodiments, a first chamfer is formed on one side of the extension block located at the first clamping hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] FIG1 is a schematic diagram of the overall structure of a step-by-step clamping fixture according to a first embodiment of the present application;

[0020] FIG2 is a schematic diagram of the positions of the lower turntable and the upper turntable in Example 1 of the present application;

[0021] FIG3 is a schematic diagram of the position of the moving block in Example 1 of the present application;

[0022] FIG4 is a schematic diagram of the connection structure of the clamping disk in Example 1 of the present application;

[0023] FIG5 is a schematic structural diagram of a driving assembly in Example 1 of the present application;

[0024] FIG6 shows an initial state in which two flat wire terminals are not clamped in the first embodiment of the present application;

[0025] FIG7 is a schematic diagram of the structure of a moving block in Example 2 of the present application;

[0026] FIG8 is a schematic diagram of the position of the extension block in the second embodiment of the present application.

[0027] Explanation of the accompanying drawings: 01, first side wall; 02, second side wall; 1, fixed seat; 11, support frame; 111, guide groove; 12, moving block; 121, mounting groove; 13, spring; 2, lower turntable; 21, first clamping hole; 3, upper turntable; 31, second clamping hole; 4, pressure plate; 41, slide groove; 5, driving device; 51, slider; 52, power part; 53, driving ring; 54, protrusion; 56, connecting ear; 561, long groove; 57, connecting column; 6, clamping plate; 61, clamping hole; 62, accommodating hole; 7, clamping device; 71, clamping disk; 711, inclined groove; 72, push rod; 73, mounting seat; 74, connecting pin; 75, connecting block; 8, extension block; 81, first chamfer; 9, extension strip; 91, second chamfer; 10, flat wire. DETAILED DESCRIPTION

[0028] The present application is described below with reference to Figures 1-7.

[0029] An embodiment of the present application provides a step-by-step clamping tool.

[0030] Example 1:

[0031] The present application provides a step-by-step clamping tool, including a fixed seat 1 and a lower turntable 2 and an upper turntable 3 rotatably connected to the fixed seat 1, the lower turntable 2 and the upper turntable 3 are coaxially arranged and the lower turntable 2 is located below the upper turntable 3, and a clamping piece 6 is provided above the upper turntable 3, the clamping piece 6 is slidably connected to the fixed seat 1, and the sliding direction of the clamping piece 6 relative to the fixed seat 1 is along the radial direction of the upper turntable 3; a plurality of first clamping holes 21 are opened on the lower turntable 2, a plurality of second clamping holes 31 are opened on the upper turntable 3, and a plurality of clamping holes 31 are opened on the clamping piece 6 The hole 61, the first clamping hole 21, the second clamping hole 31, and the clamping hole 61 are configured to pass through the ends of the two flat wires 10. The upper turntable 3 and the lower turntable 2 are connected to a driving device 5 that drives the upper turntable 3 and the lower turntable 2 to rotate in opposite directions. The clamping piece 6 is connected to a clamping device 7 that drives the clamping piece 6 to move along the radial direction of the upper turntable 3. The driving device 5 first drives the relatively close inner walls of the first clamping hole 21 and the second clamping hole 31 to align with the side walls of the flat wire 10, and then the clamping device 7 drives the clamping piece 6 to press against the ends of the two flat wires 10. The end of the flat wire 10 can also be called a flat wire end.

[0032] By adopting the above-mentioned technical solution, when in use, the upper turntable 3 is located above the lower turntable 2, and the upper turntable 3 and the lower turntable 2 are both rotatably connected to the fixed seat 1, so that the first clamping hole 21 on the lower turntable 2 and the second clamping hole 31 on the upper turntable 3 can be set to correspondingly penetrate two flat wire ends, and at the same time, multiple first clamping holes 21 and second clamping holes 31 on the upper turntable 3 and the lower turntable 2 can clamp multiple flat wires at the same time. When the driving device 5 rotates the upper turntable 3 and the lower turntable 2 in opposite directions, the relatively close inner walls of the first clamping holes 21 and the second clamping holes 31 can gradually align the side walls of the two flat wires, and the clamping plate 6 is driven by the clamping device 7. The clamping hole 61 on the clamping plate 6 also penetrates the flat wire end, so that the clamping hole 61 squeezes and clamps the two flat wire ends, so that the end side walls of the two flat wires can be aligned first and then clamped and abutted. The driving device 5 and the clamping device 7 can move at the same time, but the driving device 5 needs to stop before the clamping device 7. The driving device 5 stops first and the clamping device 7 stops later, thereby reducing the friction on the flat wire end and reducing damage to the flat wire end.

[0033] In one or more embodiments, each clamping piece 6 is provided with a plurality of clamping holes 61 , and the clamping pieces 6 and the moving blocks 12 may correspond one to one.

[0034] In one or more embodiments, the first clamping hole 21 and the second clamping hole 31 are both rectangular holes. When a pair of relatively close inner walls of the first clamping hole 21 and the second clamping hole 31 are parallel, the side walls of the two flat wires are aligned.

[0035] By adopting the above technical solution, the first clamping hole 21 and the second clamping hole 31 are both rectangular holes. When the relatively close inner walls of the first clamping hole 21 and the second clamping hole 31 are parallel, the side walls of the two flat wires are aligned, which can reduce the resistance of the flat wires when they are squeezed relative to each other.

[0036] The present embodiment provides a step-by-step clamping fixture, referring to Figures 1 and 2, comprising a fixed seat 1, a lower turntable 2, an upper turntable 3, and a pressure plate 4 being sequentially arranged above the fixed seat 1, the pressure plate 4 being arranged to be fixed on the fixed seat 1, the upper turntable 3 and the lower turntable 2 being located between the pressure plate 4 and the fixed seat 1, the pressure plate 4 being arranged to restrict the upper turntable 3 and the lower turntable 2 so that both the upper turntable 3 and the lower turntable 2 are rotatably connected to the fixed seat 1, and a driving device 5 being arranged on the fixed seat 1 to drive the upper turntable 3 and the lower turntable 2 to rotate in opposite directions, that is, when the upper turntable 3 rotates clockwise, the lower turntable 2 rotates counterclockwise. A first clamping hole 21 is provided on the lower turntable 2, and a second clamping hole 31 is provided on the upper turntable 3. The first clamping hole 21 and the second clamping hole 31 are arranged up and down, and the first clamping hole 21 and the second clamping hole 31 are both rectangular through holes. During use, the ends of the two flat wires to be welded are sequentially inserted into the first clamping hole 21 and the second clamping hole 31 from bottom to top, so that the ends of the two flat wires are located within the first clamping hole 21 and the second clamping hole 31. When the drive device 5 drives the upper turntable 3 and the lower turntable 2 to rotate, the first clamping hole 21 and the second clamping hole 31 move in mutually offset directions, so that a pair of adjacent inner walls of the first clamping hole 21 and the second clamping hole 31 clamp the side walls of the two flat wires, aligning the side walls of the two flat wires. To simultaneously align multiple layers of flat wires, multiple first clamping holes 21 are arranged along the radial direction of the lower turntable 2, and multiple second clamping holes 31 are arranged along the radial direction of the upper turntable 3, so that the first clamping holes 21 and the second clamping holes 31 correspond one to one. Multiple first clamping holes 21 and second clamping holes 31 can be arranged circumferentially along the center of the lower turntable 2 and the upper turntable 3, so that all flat wire ends are aligned simultaneously through the first clamping holes 21 and the second clamping holes 31. When the side walls of the two flat wires are aligned, the inner walls of the first clamping hole 21 and the second clamping hole 31 that approach each other during movement are parallel. The first clamping hole 21 and the second clamping hole 31 can be in a relative twisted state during the process of inserting the flat wire end. It is sufficient that the overlapping area of ​​the first clamping hole 21 and the second clamping hole 31 can simultaneously insert the two flat wire ends.

[0037] Referring to Figure 2, a slide groove 41 is provided on the side of the pressure plate 4 facing the upper turntable 3. The length direction of the slide groove 41 is along the radial direction of the upper turntable 3. A clamping piece 6 is provided in the slide groove 41. The clamping piece 6 is slidably provided in the slide groove 41. The clamping piece 6 is located above the upper turntable 3 and is parallel to the upper surface of the upper turntable 3. The clamping piece 6 is provided along the radial line of the upper turntable 3 so that the clamping piece 6 can move along the slide groove 41. A clamping device 7 is provided on the fixed seat 1 for pushing the clamping piece 6 to move along the slide groove 41. A clamping hole 61 is provided on the clamping piece 6. The clamping hole 61 can be the same as the first clamping hole 21 and the second clamping hole 31. The clamping hole 61 is arranged in a rectangular shape. A second clamping hole 31 corresponds to the bottom of each clamping hole 61, so that the ends of the flat wire can be inserted into the clamping holes 61 at the same time. When the clamping device 7 pushes the clamping plate 6 toward the center of the upper turntable 3, the inner walls of the clamping hole 61 and the second clamping hole 31, which are relatively close to each other, are configured to clamp the ends of the two flat wires together. Because the side walls of the two flat wires are first aligned by the first clamping hole 21 and the second clamping hole 31, and no force is applied to simultaneously clamp both side walls of the same flat wire, the frictional force applied to the flat wires during the process of pushing the ends of the two flat wires toward each other and clamping them together through the clamping hole 61 is reduced, thereby protecting the flat wires and reducing damage.

[0038] In one or more embodiments, a moving block 12 is connected to the clamping plate 6, and the moving block 12 is slidingly arranged with the clamping plate 6, and the sliding direction of the moving block 12 relative to the clamping plate 6 is along the radial direction of the upper turntable 3. A spring 13 is arranged between the moving block 12 and the clamping plate 6, and the spring 13 is parallel to the sliding direction of the clamping plate 6. The clamping device 7 drives the clamping plate 6 to move along the radial direction of the upper turntable 3 through the moving block 12.

[0039] By adopting the above technical solution, the moving block 12 and the clamping plate 6 are slidingly arranged, and a spring 13 is arranged between the moving block 12 and the clamping plate 6. When the clamping device 7 drives the moving block 12, the moving block 12 moves the clamping plate 6 through the spring 13, so that the spring 13 can compensate for the error when different flat wire ends are clamped, so that multiple flat wire ends can be clamped at the same time.

[0040] In one or more embodiments, a support frame 11 is fixedly provided on the upper surface of the fixed seat 1, and the upper turntable 3, the lower turntable 2 and the clamping plate 71 are all rotatably connected to the fixed seat 1 through the support frame 11. A pressure plate 4 is provided on the upper surface of the support frame 11, and the pressure plate 4 is configured to limit the axial movement of the upper turntable 3, the lower turntable 2 and the clamping plate 71.

[0041] By adopting the above technical solution, the support frame 11 is arranged between the fixed seat 1 and the pressure plate 4, so that the upper turntable 3 and the lower turntable 2 are restricted between the fixed seat 1 and the pressure plate 4, which facilitates the installation of the upper turntable 3 and the lower turntable 2 and has a relatively simple structure.

[0042] Referring to Figure 3, a support frame 11 is arranged between the fixing seat 1 and the pressure plate 4. The lower surface of the support frame 11 is in contact with the upper surface of the fixing seat 1, and the upper surface of the support frame 11 is in contact with the lower surface of the pressure plate 4. The support frame 11, the fixing seat 1 and the pressure plate 4 are relatively fixed by bolts. At the same time, a guide groove 111 is provided on the upper surface of the support frame 11, and the length direction of the guide groove 111 is along the radial direction of the upper turntable 3. A plurality of guide grooves 111 are provided, and in combination with Figure 2, one guide groove 111 corresponds to a slide groove 41 one by one, so that the guide groove 111 and the slide groove 41 are used to place the clamping piece 6, and a moving block 12 is provided in the guide groove 111, and the moving block 12 is slidably fitted in the guide groove 111, and one end of the moving block 12 is set to connect the clamping piece 6 along the guide groove 111. An installation groove 121 is provided on the upper surface of the moving block 12, and the end of the clamping piece 6 away from the center of the upper turntable 3 slides and fits in the installation groove 121, and a spring 13 is provided in the installation groove 121, one end of the spring 13 abuts on the moving block 12, and the other end abuts on the clamping piece 6, and the length direction of the spring 13 is parallel to the sliding direction of the clamping piece 6 relative to the moving block 12. The cross section of the spring 13 can be rectangular. A receiving hole 62 is provided at the location where the spring 13 is installed on the clamping piece 6 so that one end of the spring 13 is located in the receiving hole 62 to reduce the possibility of dislocation or deflection of the spring 13.

[0043] In one or more embodiments, the clamping device 7 includes a clamping disc 71 rotatably connected to the fixed base 1 and having a plurality of inclined slots 711 formed therein. The inclined slots 711 gradually approach the center of the upper turntable 3 from one end to the other. A connecting pin 74 is fixedly provided on the movable block 12. The connecting pin 74 is inserted into and slides along the inclined slots 711. The rotation of the clamping disc 71 drives the movable block 12 to slide. One connecting pin 74 corresponds to one inclined slot 711.

[0044] By adopting the above technical solution, an inclined groove 711 is opened on the clamping disk 71, and the inclined groove 711 gradually approaches the center direction of the upper turntable 3 from one end to the other end. Therefore, when the clamping disk 71 rotates, the inclined groove 711 will push the connecting pin 74, causing the connecting pin 74 to move toward the center direction of the upper turntable 3, and then the moving block 12 and the clamping plate 6 are moved, and multiple clamping plates 6 can be driven to move at the same time.

[0045] 3 and 4 , the clamping device 7 includes a clamping disc 71, a push rod 72, and a mounting base 73. The clamping disc 71 is rotatably connected to the fixed base 1 and can be clamped between the fixed base 1 and the pressure plate 4. The inner ring of the clamping disc 71 is rotatably connected to the support frame 11. The support frame 11 can be configured in an annular shape, and the clamping disc 71 is also configured in an annular shape, so that the clamping disc 71 is located outside the support frame 11. The clamping disc 71 is provided with a plurality of inclined slots 711, each inclined slot 711 corresponding to a movable block 12. The inclined slots 711 gradually approach the center of the upper turntable 3 from one end to the other. A connecting pin 74 is provided in the inclined slot 711. One end of the connecting pin 74 is fixed to the movable block 12, and the other end is inserted into the inclined slot 711 and can slide along the inclined slot 711. The mounting seat 73 is fixed on the fixing seat 1, and the side wall of the push rod 72 is rotatably connected to the mounting seat 73, and the rotation axis of the push rod 72 and the mounting seat 73 is perpendicular to the push rod 72. A connecting block 75 is provided at one end of the push rod 72, and the connecting block 75 is rotatably connected to the clamping disk 71. The push rod 72 can be pushed by a hydraulic cylinder, and the push rod 72 drives the connecting block 75 so that the connecting block 75 rotates the clamping disk 71. When the clamping disk 71 rotates, the connecting pin 74 drives the moving block 12 to move closer to or away from the center of the upper turntable 3, thereby completing the clamping or loosening of the flat wire end.

[0046] In one or more embodiments, the driving device 5 includes a slider 51 and two driving rings 53, the two driving rings 53 are rotatably connected to the fixed seat 1, the two driving rings 53 are arranged on each other, the lower turntable 2 is fixed on the inner driving ring 53, and the upper turntable 3 is fixed on the outer driving ring 53, and the side walls of the two driving rings 53 are fixed with connecting ears 56, and the connecting ears 56 are provided with long grooves 561. The slider 51 is slidably connected to the fixed seat 1 along the radial direction of the upper turntable 3, and the two long grooves 561 are both inclined to the sliding direction of the slider 51 and the inclination angles are equal. A connecting column 57 is fixed on the slider 51 and penetrates into the long grooves 561.

[0047] By adopting the above technical solution, the two driving rings 53 are rotatably connected to the fixed seat 1, and the lower turntable 2 and the upper turntable 3 are respectively fixed on a driving ring 53. When the slider 51 moves, the two connecting columns 57 on the slider 51 move along the long groove 561, and the slider 51 can drive the two connecting ears 56 to move closer to or away from each other, so that the upper turntable 3 and the lower turntable 2 can be rotated relative to each other and the first clamping hole 21 and the second clamping hole 31 can be moved toward the middle to clamp the end of the flat wire, so that the end of the flat wire is inserted into the middle position in the first clamping hole 21 and the second clamping hole 31 in the initial state, which is convenient for insertion.

[0048] 5 , the driving device 5 includes a slider 51 , a power member 52 and two driving rings 53 . The two driving rings 53 are arranged inside and outside and are connected to rotate relative to each other. The two driving rings 53 are rotatably connected to the fixed seat 1 . The driving ring 53 on the inner side is provided for mounting the lower turntable 2 , and the driving ring 53 on the outer side is provided for mounting the upper turntable 3 . The upper surfaces of the driving rings 53 are provided with protrusions 54 . The upper turntable 3 and the lower turntable 2 are provided with slots for snapping into the protrusions 54 , so that the lower turntable 2 and the upper turntable 3 are driven by the two driving rings 53 . Two connecting ears 56 are integrally provided on the side walls of the two driving rings 53. The connecting ears 56 extend from the notch on one side of the fixed base 1. The slider 51 is slidably connected to the fixed base 1. The sliding direction of the slider 51 is from the middle of the two connecting ears 56 to the center direction of the upper turntable 3. Two connecting columns 57 are provided on the slider 51. A long groove 561 is opened on the connecting ears 56. The length direction of the long groove 561 is inclined to the sliding direction of the slider 51, and the angles between the two long grooves 561 and the sliding direction of the slider 51 are equal. The power piece 52 is connected to the slider 51. The power piece 52 can be a hydraulic cylinder. The power piece 52 is configured to drive the slider 51 to slide. One end of the connecting column 57 is fixed to the slider 51, and the other end is inserted into the long groove 561. The connecting column 57 can move along the length direction of the long groove 561, so that when the slider 51 drives the connecting column 57 to move, the two connecting columns 57 can move the two connecting ears 56 closer to or away from each other; when the two connecting ears 56 approach or move away from each other, the two driving rings 53 drive the upper turntable 3 and the lower turntable 2 to rotate in opposite directions, thereby aligning or loosening the two flat wire ends located in the first clamping hole 21 and the second clamping hole 31.

[0049] The working process of this embodiment:

[0050] The multiple flat wires of the stator are correspondingly inserted into the first clamping hole 21, the second clamping hole 31 and the clamping hole 61 from bottom to top, and the driving device 5 drives the two driving rings 53 to rotate in opposite directions, so that a group of relatively close side walls of the first clamping hole 21 and the second clamping hole 31 bring the ends of the two flat wires relatively close and aligned, and the clamping device 7 pushes the multiple clamping pieces 6 to approach the center of the upper turntable 3 at the same time, so that the clamping hole 61 cooperates with the inner wall of the first clamping hole 21 or the second clamping hole 31 to clamp the ends of the two flat wires.

[0051] 6 , the plurality of flat wires of the stator are correspondingly inserted into the first clamping hole 21, the second clamping hole 31 and the clamping hole 61 from bottom to top, and then the driving device 5 drives the two driving rings 53 to rotate in opposite directions, so that the first clamping hole 21 and the second clamping hole 31 have and only have one set of relatively close side walls. In this embodiment, the side wall of the flat wire that abuts against the side wall relatively close to the first clamping hole 21 and the second clamping hole 31 because the driving device 5 drives the first clamping hole 21 and the second clamping hole 31 to move is the first side wall of the flat wire. 1, the relatively close side walls of the first clamping hole 21 and the second clamping hole 31 bring the ends of the two flat wires relatively close to each other and align the first side wall 01 of the flat wire, and then push the multiple clamping pieces 6 toward the center of the upper turntable 3 at the same time through the clamping device 7, so that the clamping hole 61 cooperates with the inner wall of the first clamping hole 21 or the second clamping hole 31 to clamp the ends of the two flat wires. In this embodiment, because the clamping device 7 pushes the clamping piece 6 on the flat wire, the side wall of the flat wire abutted by the inner wall of the clamping hole 61 on the clamping piece 6 is the second side wall 02 of the flat wire.

[0052] Example 2:

[0053] The present embodiment provides a step-by-step clamping tool. Referring to Figures 7 and 8, the difference between this embodiment and Example 1 is that an extension block 8 is fixedly provided on the inner wall of the first clamping hole 21 of the lower turntable 2. The width of the extension block 8 is greater than the total width of the two flat wire ends. One side of the extension block 8 is fixed on the lower turntable 2, and the other end extends upward to the position of the second clamping hole 31 and is flush with the upper surface of the upper turntable 3. In addition, a first chamfer 81 is provided on the side of the lower turntable 2 located at the first clamping hole 21, so that the lower part of the extension block 8 does not affect the insertion of the end of the flat wire into the first clamping hole 21. The inner wall of the first clamping hole 21 where the extension block 8 is located is the inner wall of the first clamping hole 21 for cooperating with the second clamping hole 31 to clamp the end of the flat wire, that is, when the first clamping hole 21 and the second clamping hole 31 move toward the end of the flat wire, the extension block 8 approaches the side wall of the flat wire, so that the extension block 8 cooperates with the inner wall of the second clamping hole 31 to abut the end of the flat wire. Since the extension block 8 is extended to a position flush with the upper turntable 3 , the clamping forces acting on the side walls of the two flat wires are on the same horizontal line, thereby preventing the flat wires from bending due to the forces acting on both sides of the flat wires being arranged vertically.

[0054] The first chamfer 81 set on one side of the first clamping hole 21 of the extension block 8 can guide the flat wire into the first clamping hole 21 when the flat wire is inserted from bottom to top, reducing the space reduction caused by the extension block 8 when the flat wire end is inserted, thereby facilitating the flat wire to pass through the first clamping hole 21.

[0055] In one or more embodiments, an extension block 8 is fixedly provided on the inner wall of the first clamping hole 21, one side of the extension block 8 is fixed to the lower turntable 2, and the other side extends upward into the second clamping hole 31 of the upper turntable 3, and when the upper turntable 3 and the lower turntable 2 clamp the side wall of the flat wire relative to each other, the extension block 8 is in the position of the second clamping hole 31 and abuts against the side wall of the flat wire.

[0056] By adopting the above technical solution, one side of the extension block 8 is fixed to the lower turntable 2, and the extension block 8 will move with the lower turntable 2, so that the extension block 8 cooperates with the second clamping hole 31 to align the ends of the flat wire. Since the forces applied by the extension block 8 and the second clamping hole 31 to the two ends of the flat wire are on the same straight line, the bending of the flat wire ends caused by the upper and lower forces during the clamping process is reduced.

[0057] In one or more embodiments, an extension strip 9 is fixedly provided on the clamping sheet 6, the width of the extension strip 9 is smaller than the width of a flat wire, one end of the extension strip 9 extends downward into the second clamping hole 31, and the extension strip 9 is fixed in the middle of the side wall of the clamping hole 61 which is configured to clamp the flat wire, and the extension strip 9 is configured to cooperate with the second clamping hole 31 to clamp the end of the flat wire.

[0058] By adopting the above technical solution, the width of the extension bar 9 is smaller than the width of a flat wire, so as to prevent the extension bar 9 from obstructing the first clamping hole 21 and the second clamping hole 31 when clamping the flat wire. At the same time, the extension bar 9 can also cooperate with the inner wall of the second clamping hole 31 to put the force acting on the end of the flat wire on the same straight line, thereby reducing deformation of the end of the flat wire.

[0059] Referring to Figures 7 and 8, an extension bar 9 is fixedly provided on the clamping piece 6. One end of the extension bar 9 can be fixed to the upper surface of the clamping piece 6, and the other end extends downward. The cross section of the extension bar 9 is configured to be an isosceles trapezoid, and the upper base of the isosceles trapezoid of the extension bar 9 faces the middle of the clamping hole 61. The extension bar 9 is located in the middle of the side corresponding to the clamping hole 61. When the end of the flat wire is inserted into the clamping hole 61 and is located on one side of the extension bar 9, the upper turntable 3 and the lower turntable 2 can be rotated to move the end of the flat wire along the waistline of the isosceles trapezoid of the extension bar 9 to a position directly opposite the extension bar 9. The cross section of the extension bar 9 is configured to be an isosceles trapezoid. When the end of the flat wire is located on one side of the extension bar 9, the side walls of the two flat wire ends are aligned first, so that the end of the flat wire slides along the side wall of the extension bar 9 to a position directly opposite the extension bar 9. At the same time, the width of the extension bar 9 is smaller than the width of a flat wire end. The lower end of the extension bar 9 extends into the second clamping hole 31 and is flush with the lower surface of the upper turntable 3. Therefore, when the clamping piece 6 moves toward the end of the flat wire, the extension bar 9 cooperates with the second clamping hole 31 to clamp the end of the flat wire, and the forces on the ends of the flat wire are on the same horizontal line to prevent the ends of the flat wire from bending under the force. A second chamfer 91 is provided at the lower end of the extension bar 9. The second chamfer 91 is configured to guide the end of the flat wire to slide to one side of the extension bar 9 when the end of the flat wire is inserted into the second clamping hole 31, thereby reducing the area where the extension bar 9 directly abuts the end of the flat wire.

[0060] In summary, this application has at least one of the following effects:

[0061] 1. When the upper turntable 3 and the lower turntable 2 are rotated in opposite directions by the driving device 5, the relatively close inner walls of the first clamping hole 21 and the second clamping hole 31 can gradually align the side walls of the two flat wires. The clamping device 7 drives the clamping plate 6, and the clamping hole 61 on the clamping plate 6 also passes through the flat wire end, so that the clamping hole 61 squeezes and clamps the two flat wire ends, thereby first aligning the side walls of the two flat wire ends and then clamping them into abutment. This application has the effect of aligning the side walls of the flat wire ends before the two flat wire ends abut each other.

[0062] 2. Since the first clamping hole 21 and the second clamping hole 31 are both rectangular holes, when the inner walls of the first clamping hole 21 and the second clamping hole 31 are relatively close and parallel, the side walls of the two flat wires are aligned, which can reduce the resistance of the flat wires when they are squeezed relative to each other.

[0063] 3. The ends of the flat wire are aligned by cooperating with the extension block 8 and the second clamping hole 31. Since the forces applied to the ends of the flat wire by the extension block 8 and the second clamping hole 31 are on the same straight line, the bending of the ends of the flat wire caused by the upper and lower forces during the clamping process is reduced.

Claims

1. A step-by-step clamping tool, comprising: A fixed seat (1) and a lower turntable (2) and an upper turntable (3) rotatably connected to the fixed seat (1), the lower turntable (2) and the upper turntable (3) are coaxially arranged and the lower turntable (2) is located below the upper turntable (3), a clamping piece (6) is arranged above the upper turntable (3), the clamping piece (6) is slidably connected to the fixed seat (1), and the sliding direction of the clamping piece (6) relative to the fixed seat (1) is along the radial direction of the upper turntable (3); a plurality of first clamping holes (21) are opened on the lower turntable (2), a plurality of second clamping holes (31) are opened on the upper turntable (3), a plurality of clamping holes (61) are opened on the clamping piece (6), and a first clamping hole (21) is opened on the lower turntable (2), a plurality of second clamping holes (31) are opened on the upper turntable (3), and a plurality of clamping holes (61) are opened on the clamping piece (6). A clamping hole (21), a second clamping hole (31) and a clamping hole (61) are provided for inserting the ends of two flat wires, the upper turntable (3) and the lower turntable (2) are connected with a driving device (5) for driving the upper turntable (3) and the lower turntable (2) to rotate in opposite directions, the clamping piece (6) is connected with a clamping device (7) for driving the clamping piece (6) to move along the radial direction of the upper turntable (3), and the driving device (5) drives the relatively close inner walls of the first clamping hole (21) and the second clamping hole (31) to align with the first side walls (01) of the two flat wires, and then the clamping device (7) drives the clamping piece (6) to press against the ends of the two flat wires.

2. A step-by-step clamping fixture according to claim 1, wherein: A moving block (12) is connected to the clamping piece (6), and the moving block (12) and the clamping piece (6) are slidingly arranged, and the sliding direction of the moving block (12) relative to the clamping piece (6) is along the radial direction of the upper turntable (3), and a spring (13) is arranged between the moving block (12) and the clamping piece (6), and the spring (13) is parallel to the sliding direction of the clamping piece (6). The clamping device (7) drives the clamping piece (6) to move along the radial direction of the upper turntable (3) through the moving block (12).

3. A step-by-step clamping fixture according to claim 2, wherein: The clamping device (7) includes a clamping disc (71), the clamping disc (71) is rotatably connected to the fixed seat (1) and a plurality of inclined grooves (711) are provided on the clamping disc (71), and the inclined grooves (711) gradually approach the center direction of the upper turntable (3) from one end to the other end. A connecting pin (74) is fixedly provided on the moving block (12), and the connecting pin (74) is inserted into the inclined groove (711) and slides along the inclined groove (711). The clamping disc (71) drives the moving block (12) to slide by rotating.

4. A step-by-step clamping fixture according to claim 3, wherein: A support frame (11) is fixedly provided on the upper surface of the fixed seat (1); the upper turntable (3), the lower turntable (2) and the clamping disc (71) are all rotatably connected to the fixed seat (1) via the support frame (11); a pressure plate (4) is provided on the upper surface of the support frame (11); the pressure plate (4) is configured to limit the axial movement of the upper turntable (3), the lower turntable (2) and the clamping disc (71).

5. The step-by-step clamping fixture according to claim 1, wherein: The driving device (5) comprises a slider (51) and two driving rings (53), the two driving rings (53) are rotatably connected to the fixed seat (1), the two driving rings (53) are sleeved on each other, the lower turntable (2) is fixed on the inner driving ring (53), and the upper turntable (3) is fixed on the outer driving ring (53), the side walls of the two driving rings (53) are fixedly provided with connecting ears (56), and the connecting ears (56) are provided with long grooves (561), the slider (51) is slidably connected to the fixed seat (1) along the radial direction of the upper turntable (3), the two long grooves (561) are both inclined to the sliding direction of the slider (51) and the inclination angles are equal, and the slider (51) is fixedly provided with a connecting column (57) that penetrates into the long grooves (561).

6. A step-by-step clamping fixture according to claim 1, wherein: The first clamping hole (21) and the second clamping hole (31) are both rectangular holes. When a pair of relatively close inner walls of the first clamping hole (21) and the second clamping hole (31) are parallel, the first side walls (01) of the two flat wires are aligned.

7. The step-by-step clamping fixture according to claim 1, wherein: An extension block (8) is fixedly provided on the inner wall of the first clamping hole (21), and the inner wall of the first clamping hole (21) where the extension block (8) is located is the inner wall of the first clamping hole (21) for clamping the end of the flat wire in cooperation with the second clamping hole (31). One side of the extension block (8) is fixed to the lower turntable (2), and the other side of the extension block (8) extends upward into the second clamping hole (31) of the upper turntable (3), and when the upper turntable (3) and the lower turntable (2) clamp the side walls of the two flat wires, the extension block (8) is located at the second clamping hole (31) and abuts against the first side walls (01) of the two flat wires.

8. The step-by-step clamping fixture according to claim 1, wherein: An extension strip (9) is fixedly provided on the clamping piece (6), the width of the extension strip (9) is smaller than the width of a flat wire, one end of the extension strip (9) extends downward into the second clamping hole (31), and the extension strip (9) is fixed to the middle of the side wall of the clamping hole (61) for clamping the two flat wires, and the extension strip (9) is configured to cooperate with the second clamping hole (31) to clamp the ends of the two flat wires.

9. The step-by-step clamping fixture according to claim 8, wherein: The cross section of the extension strip (9) is configured to be an isosceles trapezoid, and the upper base of the isosceles trapezoid of the extension strip (9) faces the middle of the clamping hole (61).

10. The step-by-step clamping fixture according to claim 7, wherein: The extension block (8) is provided with a first chamfer (81) on one side of the first clamping hole (21).

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