Steel strip unwinding device for manufacturing motor stators

Abstract

The present application discloses a steel strip unwinding device for manufacturing motor stators, comprising: a machine base forming an assembly space; a driving unit installed at the bottom of the assembly space to form an overall low center of gravity configuration; an unwinding unit arranged at the top of the machine base body, the unwinding unit comprising a turntable arranged on the outside of the machine base body, and an unwinding mechanism arranged on the turntable for expanding, propping up or contracting and releasing a steel strip roll; and a control unit for controlling the start and stop of the axial flux motor according to control instructions and detection signals. The steel strip unwinding device of the present application realizes active unwinding of the steel strip roll while also optimizing the spatial design of the equipment and ensuring the overall center of gravity stability of the equipment.

Description

Technical Field

[0001] The present application relates to the technical field of axial flux motors, and in particular to a steel strip unwinding device for manufacturing stators of axial flux motors. Background Art

[0002] Axial flux motors are widely used in electric vehicles, wind power generation, aerospace and other fields due to their small size, light weight, high efficiency and high torque density. Axial flux motors are usually composed of a disc-shaped or ring-shaped stator and a rotor carrying magnets arranged axially, wherein the stator is formed by stacked steel strips with multiple notches for winding coils, and the coils convert electrical energy into mechanical energy using the principle of electromagnetic induction.

[0003] When manufacturing the stator, the steel strip unwinding device is used to unwind the wound steel strip and feed it into the punching machine. The punching machine is used to punch out multiple concave holes (or punched holes) on the unwound steel strip. Then, the unwound steel strip with multiple concave holes is tightly wound using the winding device so that the concave holes on each circle of the steel strip can accurately correspond to each other, thereby forming a notch (or tooth groove). In this process, it is necessary to ensure that the steel strip can maintain appropriate tension throughout the entire manufacturing process, so that the concave holes at the same position in different layers are on the same normal line so that the concave holes in multiple layers can accurately correspond to each other for subsequent wire embedding or winding operations.

[0004] Generally, most manufacturers only set the driving unit on the punching machine and the winding device, so that the unwinding process of the steel strip unwinding device is passively carried out due to the traction of the punching machine or the winding device at the rear end. However, due to the large mass of the steel strip roll (or steel coil) on the unwinding device, even if a small traction force is given to it, it will be affected by the traction inertia and cause the steel strip roll to rotate excessively and even unwind excessively. Therefore, this passive unwinding method will make the tension of the steel strip on the stator manufacturing production line unstable. For example, when the tension on the steel strip is too tight, the size of the steel strip entering the punching station will be insufficient, resulting in the spacing of the punched concave holes not meeting the requirements; and when the tension on the steel strip is too loose, the unwinding amount of the steel strip unwinding device will be excessive, resulting in a large stroke of the steel strip entering the punching station, which will also cause the spacing of the punched concave holes to not meet the requirements. Therefore, the unstable tension of the steel strip will make it difficult for the concave holes on the steel strip to form corresponding notches in the subsequent process, thereby failing to ensure the accuracy of the manufactured stator, and even causing it to be scrapped. Therefore, how to avoid the unstable tension of the steel strip caused by passive unwinding to ensure the accuracy of the manufactured stator is a technical problem that needs to be solved urgently by those skilled in the art. Summary of the invention

[0005] In view of the shortcomings of the related technologies mentioned above, the purpose of the present application is to provide a steel strip unwinding device for manufacturing motor stators, so as to solve the technical problem of low precision of the manufactured stator due to unstable steel strip tension caused by passive unwinding.

[0006] To achieve the above-mentioned purpose and other related purposes, the first aspect of the present application provides a steel strip unwinding device for manufacturing a motor stator, comprising: a machine base, including a machine base body, and an assembly space formed in the machine base body; a driving unit, installed at the bottom of the assembly space to form an overall low center of gravity configuration, including an axial flux motor with an output shaft vertically arranged, and a reducer connected to the axial flux motor via a transverse belt; an unwinding unit, arranged at the top of the machine base body for connecting a pulley of the reducer via a vertical belt, a turntable connected to the pulley via a rotating shaft and arranged on the outside of the machine base body, and an unwinding mechanism arranged on the turntable for expanding, supporting or contracting and releasing the steel strip roll; and a control unit, arranged on the outside of the machine base body, for controlling the start and stop of the axial flux motor according to control instructions and detection signals.

[0007] In certain examples disclosed in the first aspect of the present application, a bottom of the machine base located on one side of the unwinding unit is provided with a longitudinally extending support foot for balancing the center of gravity when the steel strip coil is loaded.

[0008] In certain examples disclosed in the first aspect of the present application, an upper mounting plate and a lower mounting plate fixedly connected to the upper mounting plate by a connecting rod are provided at the bottom of the assembly space, and the driving unit is installed between the upper mounting plate and the lower mounting plate.

[0009] In certain examples disclosed in the first aspect of the present application, the axial flux motor is suspended on the upper mounting plate; and the reducer is fixed on the lower mounting plate and the upper mounting plate.

[0010] In certain examples disclosed in the first aspect of the present application, the input shaft of the reducer is parallel to the output shaft of the axial flux motor; the output shaft of the reducer is longitudinally arranged and parallel to the rotating shaft of the pulley.

[0011] In certain examples disclosed in the first aspect of the present application, the steel strip unwinding device also includes a detection unit, which includes: a detection bracket, which is arranged on the outside of the machine base and extends toward the feeding direction of the steel strip coil; a detection element, which is arranged in the control unit and is used to electrically connect the detection bracket to detect that when the steel strip of the steel strip coil contacts the detection bracket, it outputs a detection signal to enable the control unit to send a stop signal to the axial flux motor.

[0012] In certain examples disclosed in the first aspect of the present application, the detection bracket includes a transverse rod extending from the outside of the machine base and toward the feeding direction of the steel strip roll, and a longitudinal rod extending longitudinally from the end of the transverse rod, and the length of the longitudinal rod is greater than the width of the steel strip.

[0013] In certain examples disclosed in the first aspect of the present application, a height of a longitudinal rod of the detection bracket is lower than a height of the steel strip drawn out of the steel strip roll in a transverse direction.

[0014] In certain examples disclosed in the first aspect of the present application, a plurality of radial sliding grooves for cooperating with the unwinding mechanism are provided on the turntable.

[0015] In certain examples disclosed in the first aspect of the present application, the unwinding mechanism includes: a telescopic member, including a core shaft coaxially connected to the rotating shaft of the pulley and a sleeve sleeved on the core shaft and capable of longitudinal telescopic movement; a support assembly, including a sliding beam with one end slidingly arranged in the radial sliding groove and a pad fixed on the sliding beam for supporting the inner annular surface of the steel strip roll; a connecting rod assembly, one end of which is hinged to the sleeve and the other end is hinged to the sliding beam, for linking the support assembly to expand or contract when the sleeve moves longitudinally.

[0016] In certain examples disclosed in the first aspect of the present application, the unwinding mechanism further includes at least one protective member fixed on the pad.

[0017] In certain examples disclosed in the first aspect of the present application, a buffer material is provided on the surface of the backing plate that contacts the inner annular surface of the steel strip coil.

[0018] In certain examples disclosed in the first aspect of the present application, each group of links in the link assembly includes a double link structure hinged in parallel between the sleeve and the sliding beam.

[0019] In certain examples disclosed in the first aspect of the present application, the unwinding mechanism further includes a driving mechanism for driving the sleeve to perform longitudinal telescopic movement on the core shaft.

[0020] In some examples disclosed in the first aspect of the present application, the driving mechanism includes a mechanical rocker or a driving motor.

[0021] To summarize, the steel strip unwinding device for manufacturing motor stators provided in the present application can conveniently and quickly realize the fixing or loading of the steel strip roll by providing an unwinding mechanism that can expand to support or contract to release the steel strip roll; by providing a driving unit including an axial flux motor and a reducer, the active unwinding of the steel strip roll is realized while also optimizing the spatial design of the equipment and ensuring the overall center of gravity stability of the equipment; the present application also provides a control unit on the outside of the machine base that can control the start and stop of the axial flux motor according to control instructions and detection signals, and can make real-time adjustments to the continuation and stop of unwinding according to the tension on the steel strip, thereby avoiding the steel strip from being too tight or too loose, and further avoiding the difficulty in forming corresponding notches in the concave holes on the steel strip during subsequent processing, thereby ensuring the accuracy of the manufactured stator. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The specific features of the present application are shown in the attached claims. The features and advantages of the invention involved in the present application can be better understood by referring to the exemplary embodiments and drawings described in detail below. The drawings are briefly described as follows:

[0023] Figure 1 and Figure 2 They are respectively shown as schematic structural diagrams of a steel strip unwinding device in one embodiment of the present application at different viewing angles.

[0024] Figure 3 Shown is a schematic structural diagram of a driving unit in one embodiment of the present application.

[0025] Figure 4 It is a schematic structural diagram of a steel strip unwinding device in which the machine base is omitted in one embodiment of the present application.

[0026] Figure 5 Shown is a schematic structural diagram of an unwinding mechanism in one embodiment of the present application.

[0027] Figure 6 It is a schematic diagram showing the normal status of the detection bracket and the steel belt during unwinding in one embodiment of the present application.

[0028] Figure 7 It is a schematic diagram showing the slack state of the detection bracket and the steel belt during unwinding in one embodiment of the present application. DETAILED DESCRIPTION

[0029] The following is an explanation of the implementation of the present application by means of specific embodiments. People familiar with the art can easily understand other advantages and effects of the present application from the contents disclosed in this specification.

[0030] In the following description, reference is sometimes made to the accompanying drawings, which describe several embodiments of the present application. It should be understood that other embodiments may also be used, and that changes in module or unit composition, electrical, and operation may be made without departing from the spirit and scope of the present application. The following detailed description should not be considered restrictive, and the scope of the embodiments of the present application is limited only by the claims that are published. The terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present application.

[0031] It will be understood that when a part or element is referred to as being "on" or extending "onto" another element, the element may be directly on or directly extending onto the other element, or intervening elements may also be present. Conversely, when an element is referred to as being "directly on" or "extending directly onto" another element, there are no intervening elements. It will also be understood that when an element is referred to as being "connected" or "coupled" to another element, it may be directly connected or coupled to the other element, or there may be intervening elements. Conversely, when an element is referred to as being "directly connected" or "directly coupled" to another element, there are no intervening elements.

[0032] Relative terms such as "below" or "above" or "upper" or "lower" or "horizontal" or "vertical" may be used herein to describe the relationship of one element, layer or region to another element, layer or region as illustrated in the figures. It will be understood that these terms are intended to cover different device orientations other than the orientation depicted in the figures. In this application, the "vertical", "horizontal" and "parallel" are defined as: including the situation of ±10% based on the standard definition. For example, vertical usually refers to an angle of 90° relative to a reference line, but in this application, vertical refers to a situation within 80° to 100°.

[0033] The terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present application. When used herein, the singular forms "a", "an", and "the" are intended to also include the plural forms unless the context clearly indicates otherwise. It will also be understood that when used herein, the terms "comprise", "include", "include" and / or "comprising" specify the presence of stated features, integers, steps, operations, elements and / or parts, but do not exclude the presence or increase of one or more other features, integers, steps, operations, elements, parts and / or combinations thereof.

[0034] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as those commonly understood by ordinary technicians in the field to which this application belongs. It will also be understood that the terms used herein should be interpreted as having the meaning consistent with their meaning in the context of this specification and the relevant field, and should not be interpreted in an idealized or overly formal sense unless explicitly defined in this article.

[0035] Unless explicitly stated otherwise, comparative quantitative terms such as "above" and "below" are intended to encompass the concept of equality. As an example, "above" may not only mean "greater than" in a mathematical sense, but may also mean "equal to".

[0036] In view of the technical problems mentioned in the background technology, the present application discloses a steel strip unwinding device for manufacturing motor stators. By setting an unwinding mechanism that can expand, prop up or contract to release the steel strip roll, the fixing or loading of the steel strip roll can be conveniently and quickly achieved; by setting a driving unit including an axial flux motor and a reducer, the active unwinding of the steel strip roll is achieved while also optimizing the spatial design of the equipment and ensuring the overall center of gravity stability of the equipment; the present application also sets a control unit on the outside of the machine base that can control the start and stop of the axial flux motor according to control instructions and detection signals, and can make real-time adjustments to the continuation and stop of the unwinding according to the tension on the steel strip, thereby avoiding the steel strip from being too tight or too loose, and then avoiding the difficulty of the concave holes on the steel strip to form corresponding notches during subsequent processing, thereby ensuring the accuracy of the manufactured stator.

[0037] In order to clarify the definition of direction and the operation between different structures, a three-dimensional space defined by horizontal, vertical and vertical directions is defined in the embodiments disclosed in this application. The horizontal, vertical and vertical directions are all straight lines and are perpendicular to each other. For example, the length extension direction of the bottom of the base is defined as horizontal (e.g. Figure 2 The width extension direction of the bottom of the base is defined as the longitudinal direction (e.g. Figure 2 The vertical direction is also called the vertical direction, or the up-down direction is defined as the vertical direction (e.g. Figure 2 The Z direction in the figure).

[0038] The steel strip coil described in some embodiments of the present application refers to a rolled metal material made of a long and narrow metal sheet through a continuous rolling process before punching to form a concave hole. The steel strip coil includes an inner ring surface and an outer ring surface, and its inner ring surface can be fixed on a steel strip unwinding device. When unwinding, the steel strip located on the outer ring surface of the steel strip coil is unwound from one end. The material of the steel strip coil includes but is not limited to silicon steel and electrical steel. In some examples, in order to reduce the eddy current loss generated by the stator during use, the surface of the steel strip is coated with insulating paint. In the actual production process of the stator, the steel strip coil has a large weight due to the large number of windings.

[0039] The following combination Figures 1 to 7 The steel strip unwinding device of the present application is described in detail.

[0040] See also Figure 1 and Figure 2 , respectively showing the structural schematic diagrams of the steel strip unwinding device in one embodiment of the present application at different viewing angles. As shown in the figure, the steel strip unwinding device includes a machine base 1, a driving unit 2, an unwinding unit 3, and a control unit 4.

[0041] like Figure 1 and Figure 2As shown, the base 1 includes a base body 11 and an assembly space 12, and the assembly space 12 is formed in the base body 11 for configuring the drive unit 2. In this embodiment, the assembly space 12 is used to provide a mounting space for the drive unit 2, and the base body 11 is used as the main structural part of the base 1 to carry the unwinding unit 3 and the control unit 4. In one example, the shape of the base body 11 is an equilateral quadrilateral with a short top side, a long bottom side, and equal sides between the top side and the bottom side, which is used to provide a larger bottom area to lower the center of gravity, thereby increasing the stability and carrying capacity of the base 1, so that the steel strip unwinding device located at a relatively high height is more stable during operation, and is not easy to overturn and shake. In some other examples, the weight of the base body 11 is large to provide a firm stability of the whole machine. In order to further give the base 1 sufficient durability and carrying capacity, the base body 11 can be configured as cast iron, alloy, carbon structural steel and other materials, so that the base body 11 has sufficient rigidity and strength. Of course, the base 1 can also be set to other shapes, for example, it can be set to include a rectangular body and a rectangular space, etc. Under the guidance of this application, those skilled in the art can change the specific structure of the base 1 based on different functional requirements or structural requirements.

[0042] In one embodiment, if Figure 2 As shown, the bottom of the base 1 is located on one side of the unwinding unit 3 and is provided with a longitudinally extending support leg 13, and the longitudinally extending support leg 13 is used to balance the center of gravity of the steel strip coil 6 when it is loaded. As mentioned above, in actual production, the weight of the steel strip coil 6 is relatively large. When the steel strip coil 6 is loaded on the steel strip unwinding device, for example, on the unwinding unit 3, the center of gravity of the steel strip unwinding device as a whole will be shifted toward one side of the unwinding unit 3. Therefore, the steel strip unwinding device is prone to overturning toward the unwinding unit 3. At this time, the longitudinally extending support leg 13 can disperse the load of the unwinding unit 3, balance the center of gravity of the steel strip unwinding device, and increase the support area of ​​the base 1, thereby preventing the steel strip unwinding device from overturning.

[0043] exist Figure 2 In the example shown, the longitudinally extending support leg 13 includes two slender legs. In some examples, the longitudinally extending support leg 13 may also be configured as other structures, such as more than two legs, or as a whole piece structure extending longitudinally toward one side of the unwinding unit 3. In some other examples, a shock absorbing structure may be configured on the longitudinally extending support leg 13, and the shock absorbing structure is used to reduce the vibration generated by the steel strip unwinding device during operation, thereby improving the safety of the production process. The specific structure of the longitudinally extending support leg 13 can be determined according to actual production requirements, and this application does not impose any restrictions on this.

[0044] In one embodiment, if Figure 1As shown, the drive unit 2 is installed at the bottom of the assembly space 12 to form an overall low center of gravity configuration. As mentioned above, setting the base 1 to have a larger bottom space or setting a longitudinally extending support leg 13 on one side of the base 1 can achieve the stability of the center of gravity of the steel strip unwinding device. On this basis, setting the drive unit 2 at the bottom of the assembly space 12 of the base 1 can further lower the center of gravity of the steel strip unwinding device, thereby further preventing the steel strip unwinding device from tipping over and ensuring the safety and stability during the stator manufacturing process.

[0045] like Figure 1 As shown, in order to realize the installation of the drive unit 2, an upper mounting plate 121 and a lower mounting plate 122 are provided at the bottom of the assembly space 12 of the base 1, and the upper mounting plate 121 and the lower mounting plate 122 are fixed by a connecting rod, and the drive unit 2 is installed between the upper mounting plate 121 and the lower mounting plate 122. In one implementation, the connection method between the upper mounting plate 121 and the lower mounting plate 122 and the base 1, and the connection method between the upper mounting plate 121 and the lower mounting plate 122 and the connecting rod include but are not limited to welding, mortise and tenon connection or screw fixing.

[0046] In one embodiment, in order to be able to bear the weight of the drive unit 2 and thus ensure the stability of the drive unit 2, the upper mounting plate 121 and the lower mounting plate 122 may be configured to be made of steel or aluminum alloy. In some other embodiments, in order to absorb the vibration generated by the drive unit 2 during operation, a shock-absorbing pad may be provided at the bottom of the lower mounting plate 122. The material of the shock-absorbing pad may be, for example, rubber, polyurethane, etc., which can reduce the mechanical damage caused by the vibration of the drive unit 2 to the lower mounting plate 122 and the base 1.

[0047] In one embodiment, see Figure 3, which is a schematic diagram of the structure of the drive unit in one embodiment of the present application, as shown in the figure, the drive unit 2 includes an axial flux motor 21 and a reducer 22, the output shaft 211 of the axial flux motor 21 is arranged vertically, so that the axial flux motor 21 is arranged horizontally between the upper mounting plate 121 and the lower mounting plate 122, and the reducer 22 is connected to the axial flux motor 21 through a transverse belt 23. In this embodiment, the axial flux motor 21 is used to provide the main power for the operation of the drive unit 2. It should be understood that when unwinding the steel strip 61 wound on the steel strip roll 6, the steel strip unwinding device needs to provide a stable and large torque, but the torque directly output by the axial flux motor 21 is relatively small and the speed is high, which is not suitable for driving the steel strip unwinding device alone. In view of this, the reducer 22 can be used to convert the high speed and low torque output by the axial flux motor 21 into a low speed and high torque suitable for steel strip unwinding, so that it can not only meet the torque demand of steel strip unwinding, but also maintain efficient power transmission during the unwinding process. The types of the reducer 22 include but are not limited to planetary reducers, worm gear reducers, helical gear reducers, and the like.

[0048] Since the present application adopts an active steel strip coil driving method including an axial flux motor 21 and a reducer 22, the steel strip coil on the unwinding device will not be affected by the traction inertia of the rear-end punching machine and the winding device, causing the steel strip coil to rotate excessively and even unwind excessively, thereby effectively avoiding problems such as excessive unwinding or insufficient unwinding size caused by unstable tension of the steel strip on the stator manufacturing production line.

[0049] In the present application, the start and stop of the axial flux motor 21 is controlled by sending a control instruction through the control unit 4, and the start and stop of the axial flux motor is controlled according to the control instruction and / or the detection signal. In one embodiment, the control unit 4 can be arranged on the outside of the base body 11, for example.

[0050] The axial flux motor 21 is a preferred implementation mode of this embodiment because of its advantages such as high power, high efficiency and compact structure, and should not be understood as a limitation to the present application. For example, without changing the overall layout of the steel strip unwinding device and the base space design provided by the present application, technical personnel in this field can also replace the axial flux motor with a radial flux motor, a brushless DC motor, an AC induction motor, a stepper motor or a servo motor based on the technical ideas of the present application.

[0051] In one embodiment, if Figure 3As shown, the transverse belt 23 connects the output shaft 211 of the axial flux motor 21 and the input shaft 221 of the reducer 22. The power generated by the axial flux motor 21 is output through the output shaft 211. The transverse belt 23 transmits the power output by the axial flux motor 21 to the reducer 22 through the input shaft 221 of the reducer 22. Finally, the output shaft 222 of the reducer 22 outputs a suitable speed and torque for unwinding the steel strip coil 6. In certain other embodiments, the output shaft 211 of the axial flux motor 21 and the input shaft 221 of the reducer 22 may be connected by a chain or a gear. The specific power transmission method is determined according to actual production requirements, and this application does not impose any restrictions on this.

[0052] In one embodiment, the input shaft 221 of the reducer 22 is parallel to the output shaft 211 of the axial flux motor 21. In this way, friction and loss generated when connecting the input shaft 221 of the reducer 22 and the output shaft 211 of the axial flux motor 21 can be avoided, thereby improving the driving efficiency of the drive unit 2.

[0053] In one embodiment, in order to optimize the layout of the drive unit 2 between the upper mounting plate 121 and the lower mounting plate 122, as shown in FIG. Figure 1 and Figure 3 As shown, the axial flux motor 21 is suspended on the upper mounting plate 121, and the reducer 22 is fixed on the lower mounting plate 122 and the upper mounting plate 121. It should be understood that the weight of the axial flux motor is relatively small. It is suspended on the upper mounting plate 121, which is easy for operators to access, so as to facilitate the disassembly and maintenance of the axial flux motor. In addition, the suspension of the axial flux motor is conducive to ventilation and heat dissipation, preventing it from overheating during continuous operation. Correspondingly, the weight of the reducer is relatively large. Fixing it to the upper mounting plate 121 and the lower mounting plate 122 at the same time can more evenly distribute the load brought by the reducer, reduce the deformation of the plate caused by a single support point, and thus ensure the stability of the installation of the drive unit 2. In one example, the axial flux motor 21 and the reducer 22 can be connected to the upper mounting plate 121 or the lower mounting plate 122 through bolts and screw holes, but it is not limited to this and is determined according to actual production needs.

[0054] In one embodiment, if Figure 1 and Figure 2 As shown, the unwinding unit 3 is disposed at the top of the base body 11 to provide an unwinding space of a preset height for the steel strip coil 6. Figure 4 , which is a schematic structural diagram of a steel strip unwinding device in which a machine base is omitted in one embodiment of the present application. As shown in the figure, the unwinding unit 3 includes a pulley 31, a rotating shaft 32, a turntable 33, and an unwinding mechanism 34.

[0055] In one embodiment, the pulley 31 is connected to the reducer 22 via a vertical belt 35, the rotating shaft 32 is connected to the pulley 31, and the rotating disk 33 is disposed outside the base body 11. Figure 4 In the illustrated embodiment, the output shaft 222 of the speed reducer 22 is longitudinally arranged and parallel to the rotating shaft 32 of the pulley 31. It should be understood that the power output by the axial flux motor 21 is transmitted from the output shaft 211 of the axial flux motor 21 to the input shaft 221 of the speed reducer 22 through the transverse belt 23, and then transmitted from the output shaft 222 of the speed reducer 22 to the rotating shaft 32 through the vertical belt 35, and the rotating shaft 32 transmits the power to the unwinding unit 3, thereby realizing the release of the steel strip roll 6.

[0056] In order to load the steel strip coil 6 on the unwinding unit 3, in one embodiment, the unwinding mechanism 34 is disposed on the turntable 33, and is used to expand and support or contract and release the steel strip coil 6. In one implementation, the turntable 33 is provided with a plurality of radial slots 331 for cooperating with the unwinding mechanism 34. Figure 4 In the example shown, the radial slots 331 are configured as four and are symmetrically arranged along the center of the turntable 33. The unwinding mechanism 34 can move along the radial slots 331 to achieve expansion or contraction. For example, when the unwinding mechanism 34 moves along the radial slots 331 to a position close to the center of the turntable 33, contraction movement can be achieved. At this time, the operator can load or unload the steel strip 6 from the unwinding mechanism 34. When the unwinding mechanism 34 moves along the radial slots 331 to a position away from the center of the turntable 33, expansion movement can be achieved. At this time, the steel strip 6 can be fixed on the unwinding mechanism 34 to achieve subsequent unwinding operations. Of course, in some other examples, the radial slots 331 can be configured in any number, and they can also be asymmetrically arranged on the turntable 33, which is determined according to actual application requirements.

[0057] In some other implementations, the radial slide groove 331 may not be provided. For example, a slide rail may be provided on the turntable 33. To match, a slider may be provided on the unwinding mechanism 34. The slider may be mounted on the slide rail. Through the slider and the slide rail, the unwinding mechanism 34 may achieve expansion or contraction movement, thereby achieving the fixing or loading of the steel strip coil 6. However, this is not limited to this. Those skilled in the art may change the specific arrangement of the unwinding mechanism 34 on the turntable 33 based on different functional requirements or structural requirements under the guidance of this application.

[0058] In one embodiment, see Figure 5 Combined with Figure 4 ,in, Figure 5 The structure diagram of the unwinding mechanism in one embodiment of the present application is shown. As shown in the figure, the unwinding mechanism 34 includes a telescopic member 341, a supporting assembly 342, and a connecting rod assembly 343.

[0059] In one embodiment, the telescopic member 341 includes a core shaft 3411 and a sleeve 3412, and the core shaft 3411 is coaxially connected to the rotating shaft 32 of the pulley 31. As mentioned above, the output shaft 222 of the reducer 22 transmits the power generated by the axial flux motor 21 to the rotating shaft 32 through the vertical belt 35, and the rotating shaft 32 drives the rotating disk 33 to rotate. At the same time, the rotating shaft 32 transmits the power to the core shaft 3411, so that the core shaft 3411 and the rotating shaft 32 move synchronously, thereby realizing the synchronous movement of the unwinding mechanism 34 and the rotating disk 33. In one example, the core shaft 3411 can be coaxially connected to the rotating shaft 32 of the pulley 31 through a coupling, and the coupling can be exemplified by a rigid coupling and a flexible coupling. In some other examples, the core shaft 3411 can be connected to the rotating shaft 32 in an integrally formed manner. In other words, the core shaft 3411 and the rotating shaft 32 can be indistinguishable. The pulley 31 is arranged at one end of the rotating shaft 32, and the turntable 33 is arranged at the other end of the rotating shaft 32. When power is transmitted to the rotating shaft 32, the rotating shaft 32 drives the turntable 33 and the unwinding mechanism 34 to rotate synchronously at the same time.

[0060] In one embodiment, the sleeve 3412 is sleeved on the core shaft 3411 and can perform longitudinal telescopic movement (i.e. Figure 5 In this embodiment, the inner diameter of the sleeve 3412 is larger than the outer diameter of the mandrel 3411, and the inner surface of the sleeve 3412 and the outer surface of the mandrel 3411 can be smoothed to reduce the friction of the sleeve 3412 when the sleeve 3412 performs longitudinal telescopic movement. In one example, a limiting structure can be configured on the mandrel 3411, and the limiting structure is used to limit the longitudinal telescopic movement of the sleeve 3412 within a certain range to prevent the sleeve 3412 from detaching from the mandrel 3411, thereby preventing the unwinding mechanism 34 from detaching from the steel strip unwinding device, thereby ensuring the safety of the unwinding operation.

[0061] In one embodiment, in order to provide power for the longitudinal telescopic movement of the sleeve 3412 on the mandrel 3411, the unwinding mechanism 34 also includes a driving mechanism. In one example, the driving mechanism can be configured as a mechanical rocker or a driving motor. In the example where the driving mechanism is configured as a mechanical rocker, the operator can realize the longitudinal telescopic movement of the sleeve 3412 by manually operating the rocker. Specifically, the mechanical rocker can also include a connecting rod on the basis of including the rocker, and the connecting rod connects the rocker and the sleeve 3412, and the connection method can be, for example, hinged. For example, the operator shakes the rocker clockwise to make the sleeve 3412 perform longitudinal stretching movement on the mandrel 3411, and correspondingly, the operator shakes the rocker counterclockwise to make the sleeve 3412 perform longitudinal contraction movement on the mandrel 3411. In the example where the driving mechanism is configured as a driving motor, the automatic control of the longitudinal telescopic movement of the sleeve 3412 can be realized. It should be noted that the above examples are only for illustrative purposes and should not be construed as limitations on the present application, as long as the longitudinal telescopic movement of the sleeve on the core shaft can be achieved.

[0062] In one embodiment, the support assembly 342 includes a slide beam 3421 and a pad 3422. One end of the slide beam 3421 is slidably disposed in the radial slide groove 331. The pad 3422 is fixed on the slide beam 3421 to support the inner annular surface of the steel strip coil 6. Figure 5 In the example shown, the pad 3422 is configured to be arc-shaped to match the inner annular surface of the steel strip coil 6. To match, the slide beam 3421 is in a rectangular parallelepiped shape, and one side thereof connected to the pad 3422 is also configured to be arc-shaped, and the slide beam 3421 is arranged at the central position of the pad 3422. Further, to ensure that one end of the slide beam 3421 can be arranged in the radial slide groove 331, the size of the slide beam 3421 is adapted to the size of the radial slide groove 331, and one end arranged in the radial slide groove 331 protrudes from the pad 3422. In some other examples, a slider or a roller may be arranged at one end of the slide beam 3421 arranged in the radial slide groove 331 to reduce the friction of the slide beam 3421 sliding in the radial slide groove 331. The fixing connection methods of the pad 3422 and the sliding beam 3421 include but are not limited to bolt connection, welding, bonding, mortise and tenon connection and one-piece molding. Examples of the material of the pad 3422 and the sliding beam 3421 include high-strength and wear-resistant materials such as steel and aluminum alloy.

[0063] In this embodiment, four support assemblies 342 are arranged along the circumference of the sleeve 3412, that is, four slide beams 3421 and pads 3422 are arranged correspondingly. Of course, any number can be set as long as it can support the steel strip coil 6 and move in the radial slide groove 331 with the longitudinal telescopic movement of the sleeve 3412 on the core shaft 3411.

[0064] In one embodiment, a buffer material is provided on the surface of the pad 3422 that contacts the inner ring surface of the steel strip coil 6. As mentioned above, the weight of the steel strip coil 6 is relatively large. When the steel strip unwinding device described in the present application is used for unwinding, the steel strip coil 6 rotates with the turntable 33 on the unwinding mechanism 34. If the buffer material is not provided, the inner ring surface of the steel strip coil 6 and the pad 3422 are in rigid contact. During the unwinding process, the steel strip coil 6 and the pad 3422 will collide with each other, and the impact force generated will damage both of them, and also generate noise. Therefore, the buffer material is provided on the surface of the pad 3422 that contacts the inner ring surface of the steel strip coil 6, which can buffer the pad 3422 and the inner ring surface of the steel strip coil 6 at the same time, preventing mechanical damage to the two, and in addition, it can effectively isolate the noise generated when the two are in contact, thereby improving the comfort of the working environment. Examples of the material of the buffer material include rubber, silicone, polyurethane and foam, etc., and the way in which it is provided on the surface of the pad 3422 includes but is not limited to bonding, embedding and bolting.

[0065] In one embodiment, one end of the connecting rod assembly 343 is hinged to the sleeve 3412, and the other end is hinged to the slide beam 3421, which is used to link the support assembly 342 to expand or contract when the sleeve 3412 moves longitudinally. Figure 5 ). For example, when the drive mechanism drives the sleeve 3412 to perform longitudinal stretching movement on the core shaft 3411, the connecting rod assembly 343 drives the slide beam 3421 to move in the radial slot 331 in a direction away from the center of the turntable 33, thereby realizing the expansion movement of the support assembly 342. At this time, the steel strip roll 6 can be fixed on the unwinding mechanism 34 to realize the subsequent unwinding operation. When the drive mechanism drives the sleeve 3412 to perform longitudinal contraction movement on the core shaft 3411, the connecting rod assembly 343 drives the slide beam 3421 to move in the radial slot 331 in a direction toward the center of the turntable 33, thereby realizing the contraction movement of the support assembly 342. At this time, the operator can realize the loading or unloading of the steel strip roll 6 from the unwinding mechanism 34.

[0066] exist Figure 5 In the example shown, the connecting rod assembly 343 includes two groups of connecting rods hinged in parallel between the sleeve 3412 and the sliding beam 3421. Of course, the connecting rod assembly 343 can be configured to include any number of connecting rods, such as one group, three groups or four groups, etc. The specific number is determined according to actual production requirements, and this application does not impose any restrictions on this.

[0067] In order to realize the articulation of the connecting rod assembly 343 and the sleeve 3412, as shown in FIG. Figure 5As shown, the sleeve 3412 is circumferentially fixed with a fixed structure, the number of which matches the number of the sliding beams 3421, and the position of which corresponds to the position of the sliding beams 3421. For example, in an example where four sliding beams 3421 are configured, the number of the fixed structures is also four, and corresponds to the position of the sliding beams 3421, so as to avoid friction between the connecting rod assembly 343 and the linkage support assembly 342 when performing expansion or contraction movement, thereby affecting the service life of the unwinding mechanism 34.

[0068] In one embodiment, in order to increase the stability of the connection between the sleeve 3412 and the sliding beam 3421, each set of connecting rods in the connecting rod assembly 343 includes a double connecting rod structure that is parallel and hinged between the sleeve 3412 and the sliding beam 3421. Figure 5 As shown, the double-link structure includes two links, which are symmetrically arranged on both sides of the fixed structure on the sliding beam 3421 and the sleeve 3412. When the sleeve 3412 performs longitudinal contraction movement on the core shaft 3411, the double-link structure of the link assembly 343 drives the support assembly 342 to expand or contract to avoid the tilt or instability that may occur in the single-link structure. Of course, each group of links in the link assembly 343 may include more links, for example, four links, but it is not limited thereto.

[0069] In one embodiment, the unwinding mechanism 34 further includes at least one protective member (not shown) fixed on the pad 3422. It should be understood that the steel strip roll 6 is wound by a steel strip 61, and the steel strip 61 rotates with the turntable 33 when unwinding. At this time, if an operator approaches the unwinding mechanism 34, the operator may be injured. The protective member can be used to prevent the operator from approaching the unwinding mechanism 34 and provide visual isolation and physical protection. For example, it can be set as a protective cover or guardrail.

[0070] As mentioned above, the passive unwinding method will make the tension of the steel strip 61 unstable. For example, when the tension on the steel strip 61 is too tight, the size of the steel strip entering the punching machine will be insufficient, resulting in the spacing of the punched holes not meeting the requirements, or even causing the risk of the steel strip 61 breaking. When the tension on the steel strip 61 is too loose, the unwinding amount of the steel strip unwinding device will be redundant, making the steel strip entering the punching machine have a large stroke, which will also cause the spacing of the punched holes not meeting the requirements, thereby resulting in waste of steel strip. Furthermore, the unstable tension of the steel strip 61 will make it difficult for the concave holes on the steel strip to form corresponding notches in the subsequent process, thereby failing to ensure the accuracy of the manufactured stator, and even causing it to be scrapped. In view of this, the steel strip unwinding device described in the present application also includes a control unit 4, which is used to control the start and stop of the axial flux motor according to control instructions and detection signals. The control unit 4 can be arranged on the outside of the base body 11, for example, including control buttons and input and output display screens.

[0071] In one embodiment, the control unit 4 includes a processing device, a storage device and an interface device. The interface device can be connected to the axial flux motor, and can also be connected to other independently packaged devices, components or mechanisms in the steel strip unwinding device that transmit data through the interface. The control unit 4 also includes at least one of the following: a prompt device, a human-computer interaction device, etc. The interface device determines its interface type according to the connected device, component or mechanism, which includes but is not limited to: a universal serial interface, a video interface, an industrial control interface, a wireless communication port, etc. The storage device is used to store the control instructions and detection signals, and the processing device is connected to the storage device, and is used to control the start or stop of the axial flux motor when executing the control instructions and detection signals, thereby realizing the control of unwinding.

[0072] In one embodiment, in order to generate the control command and the detection signal, the steel strip unwinding device further includes a detection unit. Figure 1 and Figure 2 As shown in the figure, the detection unit includes a detection bracket 5 and a detection element (not shown). The detection bracket 5 is arranged on the outside of the machine base 1 and extends in the feeding direction of the steel strip coil 6. It should be understood that the feeding direction of the steel strip coil 6 refers to the direction in which the steel strip coil 6 moves along the stator manufacturing line toward the downstream processing equipment, such as a stamping machine and a winding device, when it is unwound from the unwinding mechanism 34. For example, in Figure 2 In the example shown, the stator manufacturing line is arranged in the transverse direction, and at this time, the detection bracket 5 also extends in the transverse direction.

[0073] In one embodiment, see Figure 6 to Figure 7 In conjunction with Figure 2 ,in, Figure 6 It is a schematic diagram showing the normal state of the detection bracket and the steel belt during unwinding in one embodiment of the present application. Figure 7 The schematic diagram of the loose state of the detection bracket and the steel belt during unwinding in one embodiment of the present application is shown as follows: Figure 2 and Figure 6 As shown, the detection bracket 5 includes a transverse rod 51 and a longitudinal rod 52. The transverse rod 51 extends from the outside of the machine base 1 and toward the feeding direction of the steel strip coil 6 (i.e., the extension direction of the steel strip 61 from the steel strip coil 6 toward the rear end equipment of the punching machine, for example), and the longitudinal rod 52 extends longitudinally from the end of the transverse rod 51. That is, one end of the transverse rod 51 is connected to the machine base 1, and the other end is connected to the longitudinal rod 52. The connection method can be, for example, welding, but it is not limited thereto, as long as a fixed connection can be achieved. Figure 6In the example shown, the length of the longitudinal rod 52 is greater than the width of the steel strip 61. In this way, the longitudinal rod 52 can fully cover the width direction of the steel strip 61, which helps to ensure that the steel strip 61 can fully contact the detection bracket 5 when relaxed and trigger the control device so that it issues a command to stop unwinding.

[0074] In one embodiment, the height of the longitudinal rod 52 of the detection bracket 5 is lower than the height of the steel strip 6 being led out in the lateral direction. In other words, the height of the longitudinal rod 52 is lower than the height of the steel strip 61 being led out from the unwinding mechanism 34 to the detection bracket 5. At this time, the steel strip 61 can be smoothly led out from the unwinding mechanism 34 due to its own gravity, thereby avoiding the setting of the detection bracket 5 from hindering the unwinding of the steel strip 6.

[0075] In one embodiment, the transverse rod 51 of the detection bracket 5 forms an angle α with the bearing surface (for example, the bottom surface) of the machine base 11, and the angle α is, for example, between 30° and 45°, and specifically, for example, 40°, so that the longitudinal rod 52 of the detection bracket 5 is maintained at a certain height. Specifically, the height of the longitudinal rod 52 of the detection bracket 5 is higher than the height of the lower side of the steel strip roll 6 and lower than the height of the upper side of the steel strip roll 6, so that when the steel strip 61 released by the steel strip roll 6 is unexpectedly relaxed, it can contact the longitudinal rod 52 of the detection bracket 5 in a short time and trigger the control device so that it issues an instruction to stop unwinding, such as instructing the control unit 4 to send a stop signal to the axial flux motor 21.

[0076] In one embodiment, the detection element is disposed in the control unit 4, and is used to electrically connect the detection bracket 5 to detect that the steel strip of the steel strip coil 6 contacts the detection bracket 5, and output a detection signal to enable the control unit 4 to send a stop signal to the axial flux motor 21. It should be understood that when the downstream equipment of the steel strip unwinding device, such as a stamping machine, fails or the winding device has reached the maximum winding diameter and needs to stop working, the steel strip unwinding device should stop unwinding to avoid wasting the steel strip.

[0077] Present as Figure 7In an example shown in , the detection element can be connected to the detection bracket 5 through an electrostatic sensor. Specifically, when the downstream equipment stops working, the steel belt 61 on the longitudinal rod 52 of the detection bracket 5 is loose. At this time, the electrostatic induction between the detection bracket 5 and the steel belt 61 is weak. The electrostatic sensor outputs the electrostatic induction signal to the detection element, and the detection element sends a stop signal to the axial flux motor 21. The axial flux motor 21 stops driving the unwinding mechanism 34 to rotate, and the steel belt unwinding device stops unwinding. When the downstream equipment continues to work, the steel belt 61 on the longitudinal rod 52 of the detection bracket 5 is tightened. At this time, the electrostatic induction signal between the detection bracket 5 and the steel belt 61 is strong. The electrostatic sensor outputs the electrostatic induction signal to the detection element, and the detection element sends a start signal to the axial flux motor 21. The axial flux motor 21 continues to drive the unwinding mechanism 34 to rotate, and the steel belt unwinding device continues to unwind the steel belt roll.

[0078] To summarize, in order to overcome the technical problems in the related art that passive unwinding leads to unstable steel strip tension and low precision of the manufactured stator, the steel strip unwinding device for manufacturing motor stators provided in the present application can conveniently and quickly realize the fixing or loading of the steel strip roll by setting an unwinding mechanism that can expand, support or contract to release the steel strip roll; by setting a driving unit including an axial flux motor and a reducer, the active unwinding of the steel strip roll is realized while also optimizing the spatial design of the equipment and ensuring the overall center of gravity stability of the equipment; the present application also sets a control unit on the outside of the machine base that can control the start and stop of the axial flux motor according to control instructions and detection signals, and can make real-time adjustments to the continuation and stop of unwinding according to the tension on the steel strip, thereby avoiding the steel strip from being too tight or too loose, and then avoiding the difficulty of the concave holes on the steel strip to form corresponding notches in the subsequent processing process, thereby ensuring the precision of the manufactured stator.

[0079] The above embodiments are merely illustrative of the principles and effects of the present application and are not intended to limit the present application. Anyone familiar with the technology may modify or change the above embodiments without violating the spirit and scope of the present application. Therefore, all equivalent modifications or changes made by a person of ordinary skill in the art without departing from the spirit and technical ideas disclosed in the present application shall still be covered by the claims of the present application.

Claims

1. A steel strip unwinding device for manufacturing a motor stator, characterized in that: include: A machine base, comprising a machine base body and an assembly space formed in the machine base body; A drive unit, mounted at the bottom of the assembly space to form an overall low center of gravity configuration, comprising an axial flux motor with a vertically arranged output shaft, and a reducer connected to the axial flux motor via a transverse belt; An unwinding unit, arranged at the top of the base body and used to connect the pulley of the reducer through a vertical belt, a turntable connected to the pulley through a rotating shaft and arranged outside the base body, and an unwinding mechanism arranged on the turntable and used to expand, prop up or contract and release the steel strip roll; as well as The control unit is arranged on the outside of the base body and is used to control the start and stop of the axial flux motor according to control instructions and detection signals.

2. The steel strip unwinding device according to claim 1, characterized in that: The bottom of the machine base is located at one side of the unwinding unit and is provided with a longitudinally extending support foot for balancing the center of gravity when the steel strip coil is loaded.

3. The steel strip unwinding device according to claim 1, characterized in that: An upper mounting plate and a lower mounting plate fixedly connected to the upper mounting plate via a connecting rod are arranged at the bottom of the assembly space, and the driving unit is installed between the upper mounting plate and the lower mounting plate.

4. The steel strip unwinding device according to claim 3, characterized in that: The axial flux motor is suspended on the upper mounting plate; the reducer is fixed on the lower mounting plate and the upper mounting plate.

5. The steel strip unwinding device according to claim 1, characterized in that: The input shaft of the reducer is parallel to the output shaft of the axial flux motor; the output shaft of the reducer is longitudinally arranged and parallel to the rotating shaft of the pulley.

6. The steel strip unwinding device according to claim 1, characterized in that: Also included is a detection unit, including: A detection bracket is arranged on the outside of the machine base and extends toward the coiling direction of the steel strip coil; The detection element is arranged in the control unit and is used to electrically connect the detection bracket to detect that the steel strip of the steel strip roll contacts the detection bracket and output a detection signal to make the control unit send a stop signal to the axial flux motor.

7. The steel strip unwinding device according to claim 6, characterized in that: The detection bracket includes a transverse rod extending from the outer side of the machine base toward the coiling direction of the steel strip and a longitudinal rod extending longitudinally from the end of the transverse rod, and the length of the longitudinal rod is greater than the width of the steel strip.

8. The steel strip unwinding device according to claim 7, characterized in that: The height of the longitudinal rod of the detection bracket is lower than the height of the steel strip drawn out of the steel strip roll in the transverse direction.

9. The steel strip unwinding device according to claim 1, characterized in that: The turntable is provided with a plurality of radial sliding grooves for cooperating with the unwinding mechanism.

10. The steel strip unwinding device according to claim 9, characterized in that: The unwinding mechanism comprises: The telescopic member comprises a core shaft coaxially connected to the rotating shaft of the pulley and a sleeve sleeved on the core shaft and capable of longitudinal telescopic movement; A support assembly, comprising a slide beam with one end slidably disposed in the radial slide groove and a pad fixed on the slide beam for supporting the inner annular surface of the steel strip coil; A connecting rod assembly, one end of which is hinged to the sleeve and the other end of which is hinged to the sliding beam, is used to link the supporting assembly to expand or contract when the sleeve moves longitudinally.

11. The steel strip unwinding device according to claim 10, characterized in that: The unwinding mechanism also includes at least one protective member fixed on the backing plate.

12. The steel strip unwinding device according to claim 10, characterized in that: A buffer material is provided on the surface of the backing plate that contacts the inner annular surface of the steel strip coil.

13. The steel strip unwinding device according to claim 10, characterized in that: Each group of connecting rods in the connecting rod assembly includes a double connecting rod structure which is hinged in parallel between the sleeve and the sliding beam.

14. The steel strip unwinding device according to claim 10, characterized in that: The unwinding mechanism also includes a driving mechanism for driving the sleeve to move longitudinally and telescopically on the core shaft.

15. The steel strip unwinding device according to claim 14, characterized in that: The driving mechanism includes a mechanical rocker or a driving motor.

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