Coil expansion nose forming force control method and control device

Abstract

The invention discloses a coil expansion nose forming force control method and device, an active translation seat controlled by an independent drive is cooperated with an elastic damping piece to provide forming tension for a coil nose, and the deformation quantity of the elastic damping piece is used as feedback, so that the forming tension borne by the current coil nose can be accurately detected. And the active translation seat is timely driven according to the feedback result, and the deformation quantity of the elastic damping piece is changed, so that the forming tension borne by the nose end of the coil is controlled. By means of the method and device, the forming tension of the nose end can be accurately obtained and quantitatively controlled, and the uniqueness and accuracy of nose end forming after the coil is expanded are ensured.

Description

Technical Field

[0001] The invention relates to the field of motor stator and rotor coil manufacturing and forming equipment, and in particular to a coil expansion nose end forming force control method and control device. Background Art

[0002] During the manufacturing process of the stator and rotor coils of the motor, the wound coils need to be expanded and formed. A typical coil is Figure 1 As shown in , the coil K is generally diamond-shaped after expansion. During the expansion process, the nose end (the two ends of the coil) of the coil K will be relatively close from the initial state. Generally, during the forming process of the coil in the expansion machine, the nose end and the straight end are clamped separately. During the separation and expansion process of the straight segment, the clamping device of the nose end needs to move synchronously to form the coil K. However, during the expansion process of the coil K, the clamping device of the nose end needs to provide a certain pulling force to the coil nose end while moving, so that the nose end part can form a qualified predetermined shape during the entire coil K forming process. The pulling force needs to be controlled within a relatively constant range, and the pulling force of coils with different cross-sectional areas is different. During the tension control process, if the pulling force is too large, it may damage the insulation of the coil nose end. If the pulling force is controlled too small, the coil nose end is too loose during forming and may cause bending or chamfering. Therefore, the control of the nose end forming force is crucial for the expansion forming of the coil.

[0003] Through searching, technical documents on coil forming equipment or methods are disclosed in the prior art. For example, the utility model authorization announcement document with the publication number "CN216312902U" and the name "A direct-drive wind turbine stator coil forming machine". It relates to a direct-drive wind turbine stator coil forming machine, including a hydraulic station, an electric control box, a fuselage and two sets of forming devices, the forming device includes a support panel, a front linear traction device, a rear linear traction device and a nose traction device; the front linear traction device, the rear linear traction device and the nose traction device cooperate to form the coil; the hydraulic station controls the front clamping cylinder, the rear clamping cylinder, the nose clamping cylinder, the front stroke cylinder, the rear stroke cylinder and the nose stroke cylinder through high-pressure hoses respectively. The technical solution disclosed in the comparative document uses the nose stroke cylinder to control the moving stroke of the coil nose end during forming, and cannot accurately control the pulling force during nose end forming. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a method for controlling the forming force of a coil nose end during forming, and provides a follower support seat, which is connected to the nose end of the coil. During the coil forming process, the follower support seat is freely translated along the x-direction under the action of the pulling force of the nose end. An active translation seat is provided, and the active translation seat is driven by an independent power device to translate along the x-direction. An elastic damping member is connected between the follower support seat and the active translation seat. During the coil forming process, the deformation amount of the elastic damping member is obtained, and according to the size of the deformation amount, it is determined to drive the active translation seat to translate along the x-direction to adjust the deformation amount to control the forming force of the nose end.

[0005] Furthermore, the deformation amount of the elastic damping component is obtained by obtaining the spacing L between the active translation seat and the follower support seat along the x-direction. During the coil expansion process, the active translation seat is driven to translate along the x-direction according to the size of the spacing L, so that the spacing L is always maintained at a relatively constant value within an allowable fluctuation range.

[0006] Furthermore, during the coil expansion process, the follower support seat is limited when it reaches the first position and no longer follows the nose end translation of the coil. At this time, the locking unit is used to transmit and connect the power drive device of the follower support seat and the active translation seat, and then the power drive device is used to drive the follower support seat and the active translation seat to retreat a certain distance to complete the nose end molding.

[0007] A coil expansion nose forming force control device is also proposed, including a follower support seat slidably connected to a first linear rail, the follower support seat is connected to the nose end of the coil via a nose end clamping device arranged thereon, and also includes an active translation seat, the active translation seat is dynamically connected to an independent driving device, an elastic damping member is also connected between the active translation seat and the follower support seat, and the driving device can drive the active translation seat to separate or approach relative to the follower support seat to stretch or compress the elastic damping member.

[0008] Furthermore, the driving device includes a power unit and a lead screw, the lead screw is engaged with a nut, the nut is sleeved on a nut connecting plate, and the nut connecting plate is slidably connected to the second linear rail; a guide rod is connected between the nut connecting plate and the follower support seat, and the elastic damping member is a compression spring connected between the follower support seat and the nut connecting plate.

[0009] Furthermore, the follow-up support seat includes a mounting plate straddling the first linear rail and a pressing plate vertically connected to the side of the mounting plate, and the second linear rail is connected to the bottom surface of the mounting plate.

[0010] Furthermore, it also includes a locking unit, which includes a first locking member that moves with the nut connecting plate, and a second locking member connected to the follower support seat. The first locking member and the second locking member can be aligned and locked.

[0011] Furthermore, the first locking member includes a baffle plate, which is meshed and connected to the lead screw, and the second locking member includes a sliding locking block arranged on the pressure plate, the sliding locking block has a locking groove, and the sliding locking block can slide and contact and connect the locking groove and the baffle plate.

[0012] Furthermore, the sliding locking block includes a vertical locking block and a pair of transverse locking blocks. The vertical locking block is slidably connected to a vertical guide rail arranged on the pressure plate. The cylinder installed on the pressure plate is connected to the vertical locking block. The transverse locking block is slidably connected to a transverse guide rail arranged on the pressure plate. The vertical locking block and the transverse locking block are connected by a connecting rod assembly.

[0013] Furthermore, the bottom surface of the mounting plate is also connected to a displacement detection unit for detecting the distance between the nut connecting plate and the pressing plate.

[0014] Compared with the prior art, the technical solution of the present application has the following beneficial effects: the control method and device provided by the present invention utilize an independently driven and controlled active translation seat to cooperate with an elastic damping member to provide a forming tension for the nose end of the coil, and utilize the deformation amount of the elastic damping member as feedback, which can accurately or the forming tension currently applied to the nose end of the coil. According to the feedback result, the active translation seat is driven in a timely manner to change the deformation amount of the elastic damping member, thereby controlling the forming tension applied to the nose end of the coil. Using this method and device, the forming tension of the nose end can be accurately acquired and quantitatively controlled, ensuring the uniqueness and accuracy of the nose end forming after the coil is bulged. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 :Principle of nose tip forming force control method Figure 1 ; Figure 2 :Principle of nose tip forming force control method Figure 2 ; Figure 3 : Schematic diagram of the overall structure of the nose tip forming force control device; Figure 4 : Schematic diagram of the partial split structure of the nose tip forming force control device; Figure 5 : Schematic diagram of the back structure of the nose tip forming force control device; Figure 6 : A cross-sectional view of the nose tip forming force control device along the axial direction of the guide rod; Figure 7 : Structural diagram of the locking unit; Figure 8 : Schematic diagram of the back structure of the locking unit. DETAILED DESCRIPTION

[0016] 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.

[0017] A method for controlling the forming force of a coil nose end during expansion is provided. A follower support seat 1 is provided. The follower support seat 1 is connected to the nose end of a coil K. During the expansion process of the coil K, the follower support seat 1 freely translates along the x direction under the action of the nose end pulling force. An active translation seat 2 is provided. The active translation seat 2 is driven by an independent power device to translate along the x direction. An elastic damping member 3 is connected between the follower support seat 1 and the active translation seat 2. During the coil expansion process, the deformation amount of the elastic damping member 3 is obtained, and according to the size of the deformation amount, it is determined to drive the active translation seat 2 to translate along the x direction to adjust the deformation amount to control the forming force of the nose end.

[0018] The principle of the control method provided in this embodiment can be found in Figure 1 , the coil K is generally diamond-shaped after being formed in the figure. For the sake of a simple illustration of the principle, only one side of the nose end control forming device is shown. The follower support seat 1 is unpowered. Since it is connected to the nose end of the coil K, it will translate along the x direction under the action of the nose end tension during the expansion process of the coil K. This free state translation does not provide any reaction tension to the nose end of the coil K, so the nose end cannot be accurately and uniquely formed. The active translation seat 2 is powered, and its driving direction and speed will be determined according to the actual situation of the required control of the forming force. The elastic damping member 3 is connected between the dynamic support seat 1 and the active translation seat 2 as the source of the nose end forming tension. Obviously, when the deformation of the elastic damping member 3 is large, the tension provided to the nose end is also large, and vice versa. Since the active translation seat 2 can be driven and controlled to translate, the active translation seat 2 can be driven and controlled to translate along the x direction, changing the deformation of the elastic damping member 3 to control the tension provided to the nose end. Importantly, the deformation of the elastic damping member 3 can be obtained as a feedback signal. After the deformation information is obtained, it directly reflects the tension at the nose end, so a closed-loop control can be implemented to control the tension at the nose end within a relatively constant value within an allowable fluctuation range.

[0019] For example, when the coil K begins to expand, the follower support seat 1 begins to be pulled and translated by the nose end, and the elastic damping member 3 will begin to deform to provide a reaction forming tension for the nose end. When the follower support seat 1 moves faster during the expansion of the coil K, the deformation of the elastic damping member 3 tends to increase, and the forming tension of the nose end of the coil K may be too large at this time. When the deformation of the elastic damping member 3 is obtained to be greater than a certain threshold, the active translation seat 2 can be driven to translate along the x direction to reduce the deformation of the elastic damping member 3 and thus reduce the forming tension of the nose end. Under such a closed-loop control, the forming tension of the nose end of the coil K is accurately fed back through the deformation of the elastic damping member 3 and then quantitatively controlled, ensuring that the forming tension of the nose end of the coil K during the entire forming process can be controlled within a relatively constant range. It can be understood that the threshold of the deformation of the elastic damping member 3 can be specifically determined based on the model information such as the cross-sectional area of ​​the coil K. The deformation of the elastic damping member 3 may be a tensile deformation or a compressive deformation, which depends on the setting position of the active translation seat 2 relative to the follower support seat 1 .

[0020] Various possible implementations can be used to obtain the deformation amount of the elastic damping member 3. A more preferred implementation is to use the relative distance L between the active translation seat 2 and the follower support seat 1 as a feedback signal. It can be understood that the relative distance L between the active translation seat 2 and the follower support seat 1 directly reflects the deformation amount of the elastic damping member 3 between the two. As an alternative implementation, it is also possible to obtain the deformation force of the elastic damping member 3 as a feedback signal of the deformation amount. The elastic damping member 3 can be selected as a spring or a similar elastic member with a linear deformation coefficient. Specifically, the deformation amount of the elastic damping member 3 is obtained by obtaining the spacing L between the active translation seat 2 and the follower support seat 1 along the x direction, and the active translation seat 2 is driven to translate along the x direction according to the size of the spacing L during the coil expansion process, so that the spacing L is always maintained at a relatively constant value within an allowable fluctuation range.

[0021] After the coil K is expanded and formed, the final position of its nose end is actually determined. However, in the above embodiment, the follower support seat 1 is in a relatively free state during the translation process, which is not conducive to the determination of the final position of the follower support seat 1 after the nose end is formed. Under the action of the elastic damping member 3 and the active translation seat 2, its final position may deviate, which may affect the uniqueness of the final forming of the nose end. In order to solve this problem, a more preferred embodiment is proposed, see Figure 2 During the coil forming process, the follower support seat 1 is limited when it reaches the first position and no longer follows the nose end translation of the coil K. At this time, the locking unit is used to drive the follower support seat 1 and the power drive device of the active translation seat 2 to connect, and then the power drive device is used to drive the follower support seat 1 and the active translation seat 2 to retreat a certain distance to complete the nose end forming. Figure 2 In the figure, the first position of the follower support seat 1 is shown by the dotted line. This position is closer to the final position that the follower support seat 1 needs to reach. In this state, the nose shape of the coil is also closer as shown by the dotted line. At this time, the locking unit is enabled so that the driving device of the active translation seat 2 can be rigidly connected to the follower support seat 1, so that the reaction force of the elastic damping member 3 on the follower support seat 1 will be offset. Then the aforementioned driving device is used to drive the follower support seat 1 back to the second position, as shown by the solid line in the figure, that is, the final position of the follower support seat 1 after the nose end is finally formed. In this process, the elastic damping member 3 will not generate a force between the follower support seat 1 and the active translation seat 2, and the follower support seat 1 can be accurately positioned to the aforementioned final position. It should be noted that the follower support seat 1 is limited when it reaches the first position. Under the action of this limit, the follower support seat 1 is not allowed to continue to move forward in translation. This limit is available in the expansion machine and is used to limit the translational forward stroke of the follower support seat 1.

[0022] This embodiment also provides a coil expansion nose end forming force control device, including a follower support seat 1 slidably connected to the first linear rail 4, the follower support seat 1 is connected to the nose end of the coil K through a nose end clamping device arranged thereon, and also includes an active translation seat 2, the active translation seat 2 is dynamically connected to an independent driving device, and an elastic damping member 3 is also connected between the active translation seat 2 and the follower support seat 1, and the driving device can drive the active translation seat 2 to separate or approach relative to the follower support seat 1 to stretch or compress the elastic damping member 3.

[0023] For details, please refer to Figure 3 and Figure 4 The device is a possible implementation method of the aforementioned control method. The first linear rail 4 is used to maintain the translation direction of the follower support seat 1. The active translation seat 2 can be controlled by a servo drive or other high-precision drive unit.

[0024] In a more preferred embodiment, see Figures 4 to 8 The driving device includes a power unit and a lead screw 51, the lead screw 51 is engaged with a nut 52, the nut 52 is sleeved on a nut connecting plate 53, and the nut connecting plate 53 is slidably connected to the second linear rail 54; a guide rod 31 is connected between the nut connecting plate 53 and the follower support seat 1, and the elastic damping member 3 is a compression spring 32 connected between the follower support seat 1 and the nut connecting plate 53.

[0025] A power unit such as a servo control drives the lead screw 51 to rotate and engage the nut 52 to translate along the second linear track 54, thereby changing the relative distance between the nut connecting plate 53 and the follower support seat 1, thereby changing the compression amount of the compression spring 32, and finally changing and controlling the nose end forming tension acting on the follower support seat 1. The servo drive cooperates with the lead screw 51 and the nut 52 to accurately control the relative distance between the nut connecting plate 53 and the follower support seat 1, thereby accurately controlling the nose end forming tension.

[0026] In a more preferred embodiment, the follower support seat 1 includes a mounting plate 11 straddling the first linear rail 4, and a pressure plate 12 vertically connected to the side of the mounting plate 11, and the second linear rail 54 is connected to the bottom surface of the mounting plate 11. The first linear rails 4 are arranged in pairs, and the pressure plate 12 serves as a bearing platform to carry the nose clamping device arranged thereon, which is not shown in the figure because it is irrelevant to the purpose of the invention. In the bottom space of the pressure plate 12, components such as the nut connecting plate 53 are arranged. It should be noted that the nut connecting plate 53 and the pressure plate 12 are not rigidly connected. In this embodiment, the second linear rail 54 is arranged on the bottom surface of the mounting plate 11, so that its length does not need to be too long. If it is arranged separately like the second linear rail 54, a longer length is required.

[0027] In a more preferred embodiment, a locking unit 6 is further included, which includes a first locking member 61 that translates with the nut connecting plate 53, and also includes a second locking member 62 connected to the follower support seat 1. The first locking member 61 and the second locking member 62 can be locked in position.

[0028] An embodiment of a locking unit can be found in Figure 7 and Figure 8 The first locking member 61 includes a baffle 62, which is meshed and connected to the lead screw 51. The second locking member 62 includes a sliding locking block 63 arranged on the pressure plate 12. The sliding locking block 63 has a locking groove 631. The sliding locking block 63 can slide and connect the locking groove 631 and the baffle 62 in contact with each other.

[0029] The working principle of the locking unit is that when the follower support seat 1 reaches the first position, the baffle 62 can continue to move forward in translation under the meshing action of the lead screw 51, and when it is in contact with the pressure plate 12, the sliding lock block 63 moves in translation to wedge the baffle 62 into the locking groove 631. At this time, the lead screw 51 can directly drive the entire follower support seat 1 to retreat by using the locking between the baffle 62 and the sliding lock block 63 to complete the final shaping of the nose tip.

[0030] In fact, the locking unit can also be implemented in other ways. For example, a similar drive-controllable latch can be provided on the nut connecting plate 53 of the active translation seat 2, and a matching pin hole can be provided on the pressure plate 12 of the follower support seat 1. Based on the same principle, the lead screw 51 can directly drive the follower support seat 1.

[0031] In order to improve the locking stability, the sliding lock block 63 includes a vertical lock block 632 and a pair of transverse lock blocks 633. The vertical lock block 632 is slidably connected to the vertical guide rail 13 provided on the pressing plate 12. The cylinder 14 installed on the pressing plate 12 is connected to the vertical lock block 632. The transverse lock block 633 is slidably connected to the transverse guide rail 15 provided on the pressing plate 12. The vertical lock block 632 and the transverse lock block 633 are connected through a connecting rod assembly. The connecting rod assembly includes a transversely arranged first connecting rod 16 connected to the cylinder 14. The first connecting rod 16 is hinged to the second connecting rod 17 at both ends. The second connecting rod 17 is hinged to the third connecting rod 18. The middle part of the third connecting rod 18 is connected to the pressing plate 12 through a rotating shaft 19. The end of the third connecting rod 18 has a U-shaped groove. The pin 634 on the surface of the transverse lock block 633 is embedded in the U-shaped groove. When the cylinder 14 is in motion, the first connecting rod 16, the second connecting rod 17, and the third connecting rod 18 are linked to move the transverse locking block 633 along the transverse guide rail 15, while the vertical locking block 632 descends. The three locking blocks firmly lock the baffle 62 from the top and both sides.

[0032] In a more preferred embodiment, the bottom surface of the mounting plate 11 is also connected to a displacement detection unit for detecting the distance between the nut connecting plate 53 and the pressing plate 12. The displacement detection unit can be a displacement sensor such as a magnetic scale, or can be implemented by using an encoder using the matching relationship between a gear rack.

[0033] 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.

[0034] 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 method for controlling the forming force of a coil nose end, comprising providing a follower support seat (1), wherein the follower support seat (1) is connected to the nose end of the coil (K), and during the coil (K) forming process, the follower support seat (1) freely translates along the x direction under the action of the tension of the nose end, and wherein: An active translation seat (2) is provided, wherein the active translation seat (2) is driven by an independent power device to translate along the x-direction, and an elastic damping member (3) is connected between the follower support seat (1) and the active translation seat (2). During the coil expansion process, the deformation amount of the elastic damping member (3) is obtained, and according to the size of the deformation amount, the active translation seat (2) is driven to translate along the x-direction to adjust the deformation amount so as to control the nose tip forming force.

2. The coil forming nose forming force control method according to claim 1, characterized in that: The deformation amount of the elastic damping member (3) is obtained by obtaining the spacing L between the active translation seat (2) and the follower support seat (1) along the x-direction, and during the coil expansion process, the active translation seat (2) is driven to translate along the x-direction according to the size of the spacing L, so that the spacing L is always maintained at a relatively constant value within an allowable fluctuation range.

3. The coil forming nose forming force control method according to claim 2, characterized in that: During the coil forming process, the follower support seat (1) is limited when it reaches the first position and no longer follows the nose end translation of the coil (K). At this time, the locking unit is used to drive the follower support seat (1) and the power drive device of the active translation seat (2) to be connected, and then the power drive device is used to drive the follower support seat (1) and the active translation seat (2) to retreat a certain distance to complete the nose end forming.

4. A coil forming nose forming force control device, comprising a follower support seat (1) slidably connected to a first linear rail (4), the follower support seat (1) being connected to the nose of the coil (K) via a nose clamping device arranged thereon, characterized in that: The invention also comprises an active translation seat (2), wherein the active translation seat (2) is dynamically connected to an independent driving device, and an elastic damping member (3) is connected between the active translation seat (2) and the follower support seat (1), wherein the driving device can drive the active translation seat (2) to separate from or move closer to the follower support seat (1) so as to stretch or compress the elastic damping member (3).

5. The coil expansion nose forming force control device according to claim 4, characterized in that: The driving device comprises a power unit and a lead screw (51), the lead screw (51) is engaged with a nut (52), the nut (52) is sleeved on a nut connecting plate (53), and the nut connecting plate (53) is slidably connected to a second linear rail (54); a guide rod (31) is connected between the nut connecting plate (53) and the follower support seat (1), and the elastic damping member (3) is a compression spring (32) connected between the follower support seat (1) and the nut connecting plate (53).

6. The coil expansion nose forming force control device according to claim 5, characterized in that: The follower support seat (1) comprises a mounting plate (11) straddling the first linear rail (4), and a pressing plate (12) vertically connected to the side of the mounting plate (11), and the second linear rail (54) is connected to the bottom surface of the mounting plate (11).

7. The coil expansion nose forming force control device according to claim 6, characterized in that: The invention also comprises a locking unit (6), the locking unit (6) comprising a first locking member (61) which moves with the nut connecting plate (53), and a second locking member (62) which is connected to the follower support seat (1), the first locking member (61) and the second locking member (62) being capable of being connected in a locked manner in an aligned manner.

8. The coil expansion nose forming force control device according to claim 7, characterized in that: The first locking member (61) comprises a baffle (62) which is meshedly connected to the lead screw (51); the second locking member (62) comprises a sliding locking block (63) which is arranged on the pressure plate (12); the sliding locking block (63) has a locking groove (631); the sliding locking block (63) can slide and abut against the locking groove (631) and the baffle (62).

9. The coil expansion nose forming force control device according to claim 8, characterized in that: The sliding locking block (63) comprises a vertical locking block (632) and a pair of transverse locking blocks (633); the vertical locking block (632) is slidably connected to a vertical guide rail (13) provided on the pressing plate (12); a cylinder (14) installed on the pressing plate (12) is connected to the vertical locking block (632); and the transverse locking block (633) is slidably connected to a transverse guide rail (15) provided on the pressing plate (12); the vertical locking block (632) and the transverse locking block (633) are connected via a connecting rod assembly.

10. The coil expansion nose forming force control device according to claim 9, characterized in that: The bottom surface of the mounting plate (11) is also connected to a displacement detection unit for detecting the distance between the nut connecting plate (53) and the pressing plate (12).

Images