Coil clamping device of expanding machine

Abstract

The invention provides an expanding machine coil clamping device which comprises a first connecting rod, a second connecting rod and a telescopic rod, one end of the first connecting rod is hinged to the second connecting rod, the other end of the first connecting rod is hinged to a movable clamping part, the movable clamping part is slidably connected with a fixed supporting body, and the other end of the second connecting rod is a fixed end hinged to the fixed supporting body. The telescopic end of the telescopic rod is hinged to the first connecting rod or the second connecting rod, and the other end is hinged to the fixed supporting body. The telescopic rod stretches out and draws back to drive the first connecting rod and the second connecting rod to swing, and drives the movable clamping part to slide along the fixed supporting body and get close to the fixed clamping part. According to the clamping device provided by the invention, the movable clamping part is driven to slide, open and close through multi-connecting-rod hinging, stable clamping of the coil can be realized at the dead point positions of the connecting rods, constant large clamping force does not need to be applied to the coil, and a coil insulating layer can be prevented from being damaged while the coil is prevented from loosening.

Description

Technical Field

[0001] The invention relates to the field of motor stator and rotor coil manufacturing and forming equipment, in particular to a coil clamping device for an expansion machine. Background Art

[0002] During the forming and manufacturing process of the stator and rotor coils of the motor, the wound coils need to be expanded and formed. During the expansion process, various areas such as the nose end and the straight end of the coil need to receive a large tensile force, so it is necessary to use a clamping device that can firmly clamp the coil to clamp and fix the coil body. During the expansion process after the coil is clamped, the clamping force or the contact area between the clamping device and the coil is more critical. If the force is too large or the contact area is too small, the contact friction between the clamping device and the coil during the expansion process may damage the insulation layer of the coil. If the force is too small, the coil may loosen and the outer dimensions of the coil after expansion and forming may not meet the standards. At present, most of the clamping devices in the prior art use hydraulically driven opening and closing clamps to clamp the coil. In order to prevent loosening, a constant clamping force needs to be applied to the coil. This large clamping force may damage the insulation layer of the coil.

[0003] Through searching, technical documents related to coil clamping devices have been disclosed in the prior art. For example, the utility model announcement document with the publication number "CN201345595Y" and the name "nose clamp with automatic locking mechanism" is disclosed. A nose clamp with an automatic locking mechanism is disclosed, which belongs to the technical field of expansion machine. It is installed on the body of the expansion machine through a nose clamp seat, and includes a clamping mechanism. The clamping mechanism consists of a fixed seat and a movable door. The automatic locking mechanism includes a cylinder with a piston rod, one end of the short connecting rod is connected to the piston rod and the long connecting rod through a pin, and the other end is linked to the movable door. One end of the long connecting rod is installed on the end of the short connecting rod connected to the piston rod through a pin, and the other end extends along the connecting end of the short connecting rod and the movable door and is fixed on the nose clamp fixed seat. The comparative document uses a connecting rod hinged mode to drive the movable door to open and close the clamping coil, but the technical solution disclosed therein may become loose after each connecting rod is hinged, and it is still necessary to provide a continuous clamping force to ensure stable clamping, that is, there is still a technical problem of the insulation layer being damaged.

[0004] For example, the utility model announcement document with the publication number "CN219718052U" and the name "Wire pulling clamp for motor winding copper wire". It relates to a wire pulling clamp for motor winding copper wire, including a clamp body, one end of which is a clamping end; a main clamp body, which is rotatably connected to the clamp body, and a slide groove is provided at the main clamp body away from the clamping end; a lifting ear, which is clamped on the opposite sides of the main clamp body, and the lifting ear is slidably connected to the slide groove through a pin; a connecting piece, a first end of which is rotatably connected to an end of the clamp body away from the clamping end, and the second end of the connecting piece is rotatably connected to the pin at the lifting ear; in addition, the side walls of the clamping end and one end of the main clamp body adjacent to the clamping end are both provided with hook pulling parts. This comparative document can realize the automatic clamping of the coil, but does not consider the clamping force and the problem of preventing loosening, and is not suitable for the coil clamping of the expansion machine. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a coil clamping device for a forming machine, comprising a first connecting rod and a second connecting rod, wherein one end of the first connecting rod is hinged to the second connecting rod, and the other end is hinged to a movable clamping part, the movable clamping part is slidably connected to a fixed support body, and the other end of the second connecting rod is a fixed end hinged to the fixed support body, and further comprising a telescopic rod, wherein the telescopic end of the telescopic rod is hinged to the first connecting rod or the second connecting rod, and the other end is hinged to the fixed support body; and further comprising a fixed clamping part, wherein the telescopic rod drives the first connecting rod and the second connecting rod to swing, and drives the movable clamping part to slide along the fixed support body and move closer to the fixed clamping part, and when the first connecting rod and the second connecting rod are collinear, the movable clamping part and the fixed clamping part move closer to each other and form a clamping area matching the coil cross-section.

[0006] Furthermore, the first connecting rod is hinged to the middle section of the second connecting rod, and the telescopic end of the telescopic rod is hinged to the end section of the first connecting rod.

[0007] Alternatively, the first connecting rod and the second connecting rod end are hinged, and the telescopic end of the telescopic rod and the first connecting rod end are hinged.

[0008] Furthermore, the movable clamping part comprises a joint, the upper end of which is slidably connected to the fixed support body, and the lower end of which is hinged to the push seat.

[0009] Furthermore, a line height adjustment unit and a line width adjustment unit are connected between the movable clamping part and the fixed clamping part. The line height adjustment unit has a line height adjustment movable surface for adjusting the height of the clamping area, and the line width adjustment unit has a line width adjustment movable end for adjusting the width of the clamping area.

[0010] Furthermore, the line height adjustment unit includes an adjustment bolt connected to the fixed support body and extending along the height direction of the clamping area, and a pressure plate connected to one end of the adjustment bolt.

[0011] Furthermore, the line width adjustment unit includes an adjustment screw connected to the fixed clamping portion along the width direction of the clamping area.

[0012] Furthermore, the joint is also connected to a spring pin extending along its sliding direction, and the spring pin can contact the push seat.

[0013] Furthermore, the fixed support body comprises a fixed bracket and a sliding bracket, the fixed clamping part is connected to the fixed bracket, and the joint of the movable clamping part is slidably connected to the sliding bracket.

[0014] Furthermore, a limiting groove is provided on the fixing bracket, and a limiting block embedded in the limiting groove is connected to the top end of the pushing seat.

[0015] Compared with the prior art, the technical solution of the present application has the following beneficial effects: the clamping device proposed in the present invention utilizes a multi-link hinge to drive the movable clamping part to slide open and close, which can achieve stable clamping of the coil at the dead point of the connecting rod, without applying a constant and large clamping force to the coil, and can prevent the coil from loosening while preventing the insulation layer of the coil from being damaged. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 :Clamping device clamping principle Figure 1 ; Figure 2 :Clamping device clamping principle Figure 2 ; Figure 3 :Schematic diagram of the overall structure of the clamping device Figure 1 ; Figure 4 : Cross-sectional view of the clamping device in the clamping state; Figure 5 :Schematic diagram of the overall structure of the clamping device Figure 2 ; Figure 6 : Sectional view of the clamping device in the released state. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] A coil clamping device for a forming machine includes a first connecting rod 1 and a second connecting rod 2, wherein one end of the first connecting rod 1 is hinged to the second connecting rod 2, and the other end is hinged to a movable clamping part 3, the movable clamping part 3 is slidably connected to a fixed support body 6, and the other end of the second connecting rod 2 is a fixed end hinged to the fixed support body 6, and also includes a telescopic rod 4, the telescopic end of the telescopic rod 4 is hinged to the first connecting rod 1 or the second connecting rod 2, and the other end is hinged to the fixed support body 6; it also includes a fixed clamping part 5, the telescopic rod 4 is extended and retracted to drive the first connecting rod 1 and the second connecting rod 2 to swing, and drives the movable clamping part 3 to slide along the fixed support body 6 and move closer to the fixed clamping part 5, when the first connecting rod 1 and the second connecting rod 2 are in the same line, the movable clamping part 3 and the fixed clamping part 5 move closer to form a clamping area S matching the coil cross section.

[0019] like Figure 1 or Figure 2 As shown, the fixed support body 6 in this embodiment is a component similar to a bracket that is fixed as a whole, which is used to fix the fixed clamping part 5 and other parts. The telescopic rod 4 is driven to be telescopic. In this embodiment, the cylinder 7 can be driven to be telescopic. The cylinder 7 is hinged on the fixed support body 6. The piston connects the telescopic rod 4, which is equivalent to the telescopic rod 4 being hinged and rotatable relative to the fixed support body 6. When the telescopic rod 4 is driven to be telescopic, one end of the first connecting rod 1 and the second connecting rod 2 begin to rotate. Since the movable clamping part 3 is restricted to slide only on the fixed support body 6, the movable clamping part 3 will move closer to the fixed clamping part 5 and open and close under the drive of the first connecting rod 1 and the second connecting rod 2. When one end of the first connecting rod 1 and the second connecting rod 2 are in the same line, each hinge point is located at the dead point position. At this time, the movable clamping part 3 will be maintained stable in a certain position and will not slide relative to the fixed support body 6. By using the dead point to maintain the position of the movable clamping part 3, it is not necessary to use a driving member such as the cylinder 7 to maintain a constant driving force for clamping the coil. The driving force requirement for the driving member is relatively small, and it is not necessary to provide a large constant driving force like a hydraulic driving member. In this embodiment, when each hinge point is located at the dead point position, the movable clamping part 3 and the fixed clamping part 5 are close to form a rectangular closed clamping area S that matches the cross section of the coil. The coil is firmly clamped in the clamping area S by the four surfaces of the clamping area S and will not loosen.

[0020] A possible implementation can be as follows Figure 2As shown, the first connecting rod 1 and the second connecting rod 2 are hinged in the middle section, and the telescopic end of the telescopic rod 4 is hinged to the end of the first connecting rod 1. In this embodiment, the hinge point A between the first connecting rod 1 and the second connecting rod 2 and the hinge point B between the first connecting rod 1 and the telescopic rod 4 do not coincide. In this embodiment, when the telescopic rod 4 is extended or retracted, a certain torque is formed between the hinge point A and the hinge point B, so that a larger clamping driving torque can be obtained with a smaller driving force to act on the movable clamping part 3. In the specific clamping process, when the movable clamping part 3 is in an open or closed state, each hinge point and connecting rod as shown in FIG. Figure 1 As shown by the dotted line. The telescopic rod 4 extends, and at this time, the telescopic rod 4 starts to rotate around its hinge end and extends at the same time, the second connecting rod 2 starts to rotate around its hinge end with the fixed support body 6, and at the same time, the first connecting rod 1 also starts to rotate around the hinge point A. At the same time, under the coordinated action of the first connecting rod 1 and the second connecting rod 2, the movable clamping part 3 starts to slide towards the fixed clamping part 5. When the first connecting rod 1 and the second connecting rod 2 are in the same line, they move around the hinge point A to the hinge point A', and the hinge point B moves to the hinge point B'. At this time, the first connecting rod 1 and the second connecting rod 2 are at the dead point, so as to maintain the clamping position of the movable clamping part 3 without loosening.

[0021] Another possible implementation can be found in Figure 1 , the first connecting rod 1 and the second connecting rod 2 are hinged at their ends, and the telescopic end of the telescopic rod 4 is hinged at the end of the first connecting rod 1. In this embodiment, the hinge point of the first connecting rod 1 and the second connecting rod 2 and the hinge point of the first connecting rod 1 and the telescopic rod 4 are both coincident at the hinge point A, and Figure 1 Similarly, during the clamping process, the hinge point A moves to the hinge point A'. When the first connecting rod 1 and the second connecting rod 2 are collinear, the first connecting rod 1 and the second connecting rod 2 are located at the dead point, thereby maintaining the clamping position of the movable clamping part 3 without loosening. Figure 2 The implementation method requires a relatively larger driving force, but the relatively telescopic distance is shorter.

[0022] based on Figure 2 In a more preferred embodiment, as Figures 3 to 6 The movable clamping part 3 includes a joint 31, the upper end of which is slidably connected to the fixed support body 6, and the lower end is hinged to the push seat 32. On the basis that the movable clamping part 3 can be opened and closed relative to the fixed clamping part 5, the hinge connection between the push seat 32 and the joint 31 can make the push seat 32 rotate relative to the joint 31 when released, so that the movable clamping part 3 and the fixed clamping part 5 have a larger opening and closing angle and distance, which is convenient for loading and unloading of the coil.

[0023] In order to adapt to the clamping of coils of different specifications, it is necessary to be able to adjust the size of the clamping area S formed after closing. In a more preferred embodiment, a line height adjustment unit and a line width adjustment unit are further connected between the movable clamping part 3 and the fixed clamping part 5. The line height adjustment unit has a line height adjustment movable surface for adjusting the height H of the clamping area S, and the line width adjustment unit has a line width adjustment movable end for adjusting the width L of the clamping area S.

[0024] In a more preferred embodiment, the wire height adjustment unit includes an adjustment bolt 61 connected to the fixed support body 6 and extending along the height direction of the clamping area S, and a pressure plate 62 connected to one end of the adjustment bolt 61. The pressure plate 62 can be raised and lowered under the adjustment of the adjustment bolt 61 to adjust the wire height.

[0025] In a more preferred embodiment, the line width adjustment unit includes an adjustment screw 51 connected to the fixed clamping part 5 along the width direction of the clamping area S. The adjustment screw 51 can adjust the spacing between the movable clamping part 3 and the fixed clamping part 5 after closing, thereby adjusting the line width. In this embodiment, a support plate 64 is also connected to the bottom of the push seat 32, and the support plate 64 can be adjusted by the adjustment handle 65 to adjust the extension distance between it and the fixed clamping part 5, so that the width L of the upper and lower ends of the clamping area S can be adjusted in cooperation with the adjustment screw 51.

[0026] In a more preferred embodiment, the joint 31 is further connected with a spring pin 34 extending along the sliding direction thereof, and the spring pin 34 can contact the push seat 32. The spring pin 34 can abut against the push seat 32 to make the push seat 32 rotate relative to the joint 31.

[0027] In a more preferred embodiment, the fixed support body 6 includes a fixed bracket 61 and a sliding bracket 62, the fixed clamping portion 5 is connected to the fixed bracket 61, and the joint 31 of the movable clamping portion 3 is slidably connected to the sliding bracket 62. The fixed bracket 61 is two side panels in this embodiment, and the sliding bracket 62 is embedded in a slidable flat plate between the two side panels, and the bottom of the flat plate is connected to a guide rail for slidingly connecting the joint 31. The sliding adjustment between the side panels and the flat plate can adjust the initial distance between the movable clamping portion 3 and the fixed clamping portion 5 as a whole, and further adjust the size of the clamping area S.

[0028] In a more preferred embodiment, a limiting groove 63 is provided on the fixed bracket 61, and a limiting block 33 embedded in the limiting groove 63 is connected to the top of the push seat 32. When the push seat 32 retreats and is released, the limiting block 33 can cooperate with the limiting groove 63 to allow the push seat 32 to rotate relative to the joint 31. A stopper 66 is also connected to one side of the limiting groove 63. The stopper 66 can limit the clamping of the push seat 32 on the one hand, and can cooperate with the spring pin 34 on the other hand to allow the push seat 32 to deflect downward to a vertical state and maintain it during the clamping process. The spring pin 34 also allows the clamping force transmitted from the first connecting rod 1 and the second connecting rod 2 to buffer the coil in the clamping area S.

[0029] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0030] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A coil clamping device for an expansion machine, characterized in that: The invention comprises a first connecting rod (1) and a second connecting rod (2), wherein one end of the first connecting rod (1) is hinged to the second connecting rod (2), and the other end is hinged to a movable clamping part (3), the movable clamping part (3) is slidably connected to a fixed support body (6), and the other end of the second connecting rod (2) is a fixed end hinged to the fixed support body (6). The invention also comprises a telescopic rod (4), wherein the telescopic end of the telescopic rod (4) is hinged to the first connecting rod (1) or the second connecting rod (2), and the other end is hinged to the fixed support body (6); and a fixed clamping part (5), wherein the telescopic rod (4) drives the first connecting rod (1) and the second connecting rod (2) to swing, and drives the movable clamping part (3) to slide along the fixed support body (6) and move closer to the fixed clamping part (5), and when the first connecting rod (1) and the second connecting rod (2) are collinear, the movable clamping part (3) and the fixed clamping part (5) move closer to form a clamping area (S) matching the cross section of the coil.

2. The coil clamping device for a forming machine according to claim 1, characterized in that: The first connecting rod (1) and the second connecting rod (2) are hinged at their middle sections, and the telescopic end of the telescopic rod (4) is hinged to the end of the first connecting rod (1).

3. The coil clamping device for a forming machine according to claim 1, characterized in that: The ends of the first connecting rod (1) and the second connecting rod (2) are hinged, and the telescopic end of the telescopic rod (4) is hinged to the end of the first connecting rod (1).

4. The coil clamping device for a forming machine as claimed in claim 2 or 3, characterized in that: The movable clamping portion (3) comprises a joint (31), the upper end of the joint (31) is slidably connected to the fixed support body (6), and the lower end of the joint (31) is hingedly connected to the push seat (32).

5. The coil clamping device for a forming machine as claimed in claim 4, characterized in that: A line height adjustment unit and a line width adjustment unit are also connected between the movable clamping portion (3) and the fixed clamping portion (5); the line height adjustment unit has a line height adjustment movable surface for adjusting the height (H) of the clamping area (S); and the line width adjustment unit has a line width adjustment movable end for adjusting the width (L) of the clamping area (S).

6. The coil clamping device for a forming machine as claimed in claim 4, characterized in that: The line height adjustment unit comprises an adjustment bolt (61) connected to a fixed support body (6) and extending in a height direction of the clamping area (S), and a pressing plate (62) connected to one end of the adjustment bolt (61).

7. The coil clamping device for a forming machine as claimed in claim 6, characterized in that: The line width adjustment unit comprises an adjustment screw (51) connected to the fixed clamping portion (5) along the width direction of the clamping area (S).

8. The coil clamping device for a forming machine as claimed in claim 7, characterized in that: The joint (31) is also connected to a spring pin (34) extending along its sliding direction, and the spring pin (34) can contact the push seat (32).

9. The coil clamping device for a forming machine as claimed in claim 4, characterized in that: The fixed support body (6) comprises a fixed bracket (61) and a sliding bracket (62), the fixed clamping portion (5) is connected to the fixed bracket (61), and the joint (31) of the movable clamping portion (3) is slidably connected to the sliding bracket (62).

10. The coil clamping device for a forming machine as claimed in claim 9, characterized in that: The fixing bracket (61) is provided with a limiting groove (63), and the top end of the pushing seat (32) is connected with a limiting block (33) embedded in the limiting groove (63).

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