A low voltage foil winding die for dry-type transformer

Abstract

The invention relates to a low-voltage foil winding mold for a dry-type transformer, and belongs to the technical field of low-voltage foil winding of transformers. A bidirectional self-locking mechanism is arranged between a driving motor and a rotation center of a winding machine, and the driving motor drives a winding mold main body and a rotation center of the winding machine to rotate synchronously through the bidirectional self-locking mechanism. The driving motor drives a cam rotating part and a crank of a crank rocker part to rotate, and the cam rotating part drives a pawl of a ratchet pawl part to disengage from the ratchet through a protruding part to lift a limit rod, and the rocker of the crank rocker part drives the other end of the toggle part to toggle the ratchet wheel step rotation, and the spring part pulls the pawl to engage with the ratchet wheel through spring reset, so that the winding mold main body is bidirectionally self-locked. At the moment when the driving motor of the winding machine stops, the bidirectional self-locking of the winding mold main body avoids deflection of the winding machine and the winding mold, and ensures that the starting position or the ending position of the coil is consistent with the design requirements, thereby improving the overall structural layout of the transformer and the coil position accuracy.

Description

Technical Field

[0001] The invention belongs to the technical field of transformer low-voltage foil winding, and in particular relates to a dry-type transformer low-voltage foil winding mould. Background Art

[0002] The low-voltage foil winding mold for dry-type transformers is a tool used to wind low-voltage coils. It mainly uses foil winding technology to meet the needs of increased current on the low-voltage side of large-capacity transformers. At present, when using the low-voltage foil winding mold for dry-type transformers to wind low-voltage coils, the winding mold is usually installed on the winding machine first, so that it is aligned with the rotation center of the winding machine, and then the foil is fixed on the mold to ensure that the starting end of the foil is flush with the edge of the mold so that the foil fits tightly with the mold. The winding machine is started. During the winding process, interlayer insulating material is placed as needed to maintain the electrical performance of the coil, and the low-voltage coil is wound according to the predetermined number of turns and direction.

[0003] However, there are some problems in the use of the current low-voltage foil winding mold for dry-type transformers: since the winding mold is installed on the winding machine, the winding mold moves synchronously with the winding machine, and the weight of the winding mold and the transformer winding acts on the winding machine. During the winding process, the weight of the object acting on the winding machine continues to increase, and the inertia will also increase accordingly. At the end of the winding, the weight of the object acting on the winding machine reaches the maximum, and the inertia is also the maximum.

[0004] At the moment the winding machine stops, inertia may cause the winding machine and the winding mold to still deflect. The excess rotation of the winding mold may cause the starting position or ending position of the coil to be inconsistent with the design requirements, thereby affecting the overall structural layout of the transformer and the position accuracy of the coil. In this regard, a low-voltage foil winding mold for dry-type transformers is proposed. Summary of the invention

[0005] In order to solve the above-mentioned problems existing in the prior art, the present invention provides a low-voltage foil winding mold for a dry-type transformer, which solves the problem in the prior art that at the moment the winding machine stops, inertia may cause the winding machine and the winding mold to still deflect, and the unnecessary rotation of the winding mold may cause the starting position or the ending position of the coil to be inconsistent with the design requirements, thereby affecting the overall structural layout of the transformer and the coil position accuracy.

[0006] The purpose of the present invention can be achieved through the following technical solutions:

[0007] A low-voltage foil winding die for a dry-type transformer, comprising a winding die main body and a bidirectional self-locking mechanism connected to the winding die main body, wherein the winding die main body is mounted on the rotation center of a winding machine, the rotation center of the winding machine is externally connected to a driving motor, the bidirectional self-locking mechanism is arranged between the driving motor and the rotation center of the winding machine, and the driving motor drives the winding die main body and the rotation center of the winding machine to rotate synchronously through the bidirectional self-locking mechanism;

[0008] The two-way self-locking mechanism comprises a support part, a ratchet pawl part, a toggle part, a crank rocker part and a cam rotating part arranged on the winding machine, the ratchet of the ratchet pawl part is connected to the winding mold body, a limit rod is arranged on one side of the pawl of the ratchet pawl part, the other side of the pawl of the ratchet pawl part is connected to the toggle part through a spring part, one end of the toggle part is hinged to the rocker of the crank rocker part, and the crank of the crank rocker part and the cam rotating part are both sleeved on the output end of the driving motor;

[0009] The driving motor drives the cam rotating part and the crank of the crank rocker part to rotate, and the cam rotating part lifts the limit rod through the protruding part to drive the pawl of the ratchet pawl part to disengage from the ratchet, and the rocker of the crank rocker part drives the other end of the toggle part to toggle the ratchet wheel to rotate in steps, and the spring part pulls the pawl to engage with the ratchet wheel through spring reset, so that the winding mold body is self-locking in both directions.

[0010] As a further solution of the present invention, the ratchet pawl portion includes a ratchet and a pawl, the teeth of the ratchet are rectangular teeth, the pawl is provided with a rectangular slot, and the rectangular teeth and the rectangular slot are meshed.

[0011] As a further solution of the present invention, the toggle part is an arc-shaped toggle rod, the pawl is provided with a first fixing rod, the arc-shaped toggle rod is provided with a second fixing rod, and both ends of the spring part are fixedly sleeved on the first fixing rod and the second fixing rod respectively.

[0012] As a further solution of the present invention, the crank rocker part includes a crank, a first connecting rod and a second connecting rod, the first end of the first connecting rod and the first end of the second connecting rod are fixedly connected by a rotating shaft, the rotating shaft is hinged to the support part, the second end of the first connecting rod is hinged to the arc-shaped toggle rod, the second end of the second connecting rod is hinged to the first end of the crank, and the output shaft of the drive motor is connected to the eccentric point of the second end of the crank.

[0013] As a further solution of the present invention, the limiting rod and the first fixing rod are located on both sides of the pawl, and a first arc-shaped structure is provided below the pawl between the limiting rod and the first fixing rod.

[0014] As a further solution of the present invention, the cam rotating portion includes a rotating wheel and a protrusion arranged on the outer side of the rotating wheel, and the side edge of the protrusion is a second arc structure.

[0015] As a further solution of the present invention, the number of the bidirectional self-locking mechanisms is two, and the two bidirectional self-locking mechanisms are symmetrically arranged on both sides of the winding mold.

[0016] As a further solution of the present invention, the ratchet of the ratchet pawl part, the winding mold body and the rotation center of the winding machine move synchronously, the ratchet and the rotating wheel are connected by a rotating rod, the rotating rod and the rotating wheel are rotationally connected, and the rotating rod is fixedly connected to the axis of the ratchet.

[0017] The beneficial effects of the present invention are:

[0018] By arranging a two-way self-locking mechanism between the driving motor and the rotation center of the winding machine, the driving motor drives the winding mold body and the rotation center of the winding machine to rotate synchronously through the two-way self-locking mechanism, the driving motor drives the cam rotating part and the crank of the crank rocker part to rotate, the cam rotating part drives the pawl of the ratchet pawl part to disengage from the ratchet through the protruding part to lift the limit rod, the rocker of the crank rocker part drives the other end of the toggle part to toggle the ratchet step rotation, and the spring part pulls the pawl to engage with the ratchet through spring reset, so that the winding mold body is bidirectionally self-locked. At the moment the driving motor of the winding machine stops, the bidirectional self-locking of the winding mold body overcomes the inertia, avoids the deflection of the winding machine and the winding mold, and ensures that the starting position or the ending position of the coil is consistent with the design requirements, thereby improving the overall structural layout of the transformer and the coil position accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings.

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 It is a schematic diagram of the structure of the bidirectional self-locking mechanism of the present invention;

[0022] Figure 3 It is a schematic diagram of the installation of the ratchet pawl part of the present invention;

[0023] Figure 4 It is the motion state diagram of the bidirectional self-locking mechanism of the present invention;

[0024] Figure 5 It is a partial diagram of the pawl structure of the present invention.

[0025] Description of main component symbols:

[0026] In the figure: 1. winding mold body; 2. two-way self-locking mechanism; 21. support part; 22. ratchet pawl part; 221. ratchet; 222. pawl; 223. first fixed rod; 23. toggle part; 231. second fixed rod; 24. crank rocker part; 241. crank; 242. first connecting rod; 243. second connecting rod; 25. cam rotating part; 251. rotating wheel; 252. protrusion; 26. spring part; 3. winding machine; 4. limit rod. DETAILED DESCRIPTION

[0027] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation methods, structures, features and effects of the present invention are described in detail below in conjunction with the accompanying drawings and preferred embodiments.

[0028] See also Figure 1-Figure 5 The present embodiment provides a low-voltage foil winding mold for a dry-type transformer, comprising a winding mold body 1 and a bidirectional self-locking mechanism 2 connected to the winding mold body 1. The winding mold body 1 is installed on the rotation center of a winding machine 3. The rotation center of the winding machine 3 is externally connected to a driving motor. The rotation center controlled by the driving motor can keep the winding mold rotating stably, ensure uniform winding of the coil, and improve the electrical performance of the coil. The bidirectional self-locking mechanism 2 is arranged between the driving motor and the rotation center of the winding machine 3. The driving motor drives the winding mold body 1 and the winding machine 3 through the bidirectional self-locking mechanism 2. The rotation center of the machine 3 rotates synchronously. In order to keep the winding mold rotating stably, it is necessary to avoid the instability of the two ends of the winding mold due to the addition of the two-way self-locking mechanism 2 when installing the two-way self-locking mechanism 2. Therefore, the number of the two-way self-locking mechanisms 2 is two, and the two two-way self-locking mechanisms 2 are symmetrically arranged on both sides of the winding mold. In addition, while keeping the winding mold rotating stably, in order to reduce the driving force of the driving motor, a driving motor is installed at the two two-way self-locking mechanisms 2. The driving motor is located on the winding machine 3, and the two driving motors need to rotate synchronously, such as Figure 1 As shown, the drive motor cooperates with the external control system to accurately control the speed, tension and other parameters of the winding to ensure the winding quality.

[0029] When the low-voltage foil winding mold for dry-type transformers commonly used on the market is used to wind the low-voltage coil, the winding mold is usually first installed on the winding machine 3 so that it is aligned with the rotation center of the winding machine 3, and then the foil is fixed on the mold to ensure that the starting end of the foil is flush with the edge of the mold so that the foil and the mold fit tightly, and the winding machine 3 is started. During the winding process, interlayer insulating material is added as needed to maintain the electrical properties of the coil, and the low-voltage coil is wound according to a predetermined number of turns and direction. However, the current low-voltage foil winding mold for dry-type transformers also has some problems when in use. At the moment the winding machine 3 stops, inertia may cause the winding machine 3 and the winding mold to still deflect, and the unnecessary rotation of the winding mold may cause the starting position or the ending position of the coil to be inconsistent with the design requirements, thereby affecting the overall structural layout of the transformer and the problem of coil position accuracy.

[0030] In order to solve the above problems, in the present embodiment, the two-way self-locking mechanism 2 is arranged between the rotation center of the driving motor and the winding machine 3, and the driving motor drives the winding mold main body 1 and the rotation center of the winding machine 3 to rotate synchronously through the two-way self-locking mechanism 2. The two-way self-locking mechanism 2 includes a support part 21, a ratchet pawl part 22, a toggle part 23, a crank rocker part 24 and a cam rotating part 25 arranged on the winding machine 3. The support part 21 is a support frame, and the support frame is located on the winding machine 3. The support frame provides support for the ratchet pawl part 22, the toggle part 23, the crank rocker part 24 and the cam rotating part 25. The ratchet 221 of the ratchet pawl part 22 is connected to the winding mold main body 1, and a limiting rod 4 is arranged on one side of the pawl 222 of the ratchet pawl part 22, and the other side of the pawl 222 of the ratchet pawl part 22 is connected to the toggle part 23. The crank 241 of the crank rocker part 24 and the cam rotating part 25 are both sleeved on the output end of the driving motor. When the driving motor is started, the driving shaft of the motor drives the crank 241 of the crank rocker part 24 and the crank 241 of the crank rocker part 24 to rotate synchronously. The driving motor drives the cam rotating part 25 and the crank 241 of the crank rocker part 24 to rotate. The cam rotating part 25 drives the pawl 222 of the ratchet pawl part 22 to disengage from the ratchet 221 through the protruding part of the limit rod 4. The rocker of the crank rocker part 24 drives the other end of the toggle part 23 to toggle the ratchet 221 to rotate in steps. The spring part 26 pulls the pawl 222 to engage with the ratchet 221 through the spring reset, so that the winding mold body 1 is bidirectionally self-locking.

[0031] In addition, the speed of the step rotation of the ratchet 221 is related to the rotation speed of the drive motor. The faster the drive motor rotates, the faster the other end of the crank rocker part 24 drives the ratchet 221 to rotate in steps. In addition, the structures adopted by the two-way self-locking mechanism 2 are all mechanical parts. The parameters of the coordination between the mechanical parts can be known in advance during the design, and then the corresponding parameters of the drive motor are determined according to the parameters of the coordination between the mechanical parts. This design can not only overcome inertia at the moment when the winding machine 3 stops, and avoid deflection of the winding machine 3 and the winding mold, but also make the overall structural layout and coil position of the transformer easier to obtain, ensuring that the starting position or ending position of the coil is consistent with the design requirements, thereby improving the overall structural layout and coil position accuracy of the transformer.

[0032] Since the ratchet 221 and the pawl 222 are unidirectionally meshed under normal circumstances, one-way self-locking can be achieved. The present application intends to make the winding mold body 1 bidirectionally self-locking. In order to deal with this problem, in one embodiment, the ratchet pawl portion 22 includes a ratchet 221 and a pawl 222. The teeth of the ratchet 221 are rectangular teeth, and the pawl 222 is provided with a rectangular slot. The rectangular teeth and the rectangular slot are meshed with each other. The engagement of the rectangular teeth on the ratchet 221 and the rectangular slot on the pawl 222 is equivalent to a snap fit, so bidirectional self-locking can be achieved. However, it is necessary to ensure that it can be self-locking and can move. Therefore, special requirements are required for the structure of the ratchet 221 and the pawl 222, such as Figure 2 or Figure 3 As shown, the pawl 222 here is different from the pawl 222 in normal circumstances. In fact, the pawl 222 here is equivalent to a hinged rod, one end of the hinged rod is hinged to the support part 21, and a rectangular slot is set at the other end of the hinged rod, and the rectangular teeth and the rectangular slot are meshed.

[0033] Since the step rotation of the ratchet 221 is toggled by the toggle portion 23, and the toggle portion 23 is driven by the rocker of the crank rocker portion 24, in order to avoid interference between the ratchet 221 and the crank rocker portion 24 when the toggle portion 23 toggles the ratchet 221, in one embodiment, the toggle portion 23 is an arc-shaped toggle rod, the pawl 222 is provided with a first fixed rod 223, and the arc-shaped toggle rod is provided with a second fixed rod 231, and the two ends of the spring portion 26 are respectively fixedly sleeved on the first fixed rod 223 and the second fixed rod 231, as shown in FIG. Figure 3As shown, the design of the arc-shaped toggle rod can not only toggle the teeth outside the ratchet 221 to make the ratchet 221 rotate in steps, but also will not cause interference to the ratchet 221 and the crank rocker portion 24. In addition, the spring portion 26 is a spring, and the two ends of the spring are respectively fixedly mounted on the first fixed rod 223 and the second fixed rod 231, and the first fixed rod 223 and the second fixed rod 231 are located on the same side. The existence of the spring allows the pawl 222 to be reset after disengaging from the ratchet 221, that is, to engage with the teeth of the ratchet 221 again, so as to facilitate step rotation.

[0034] In order to make the rocker of the crank rocker part 24 better drive the other end of the toggle part 23 to toggle the ratchet 221 to rotate in steps, in one embodiment, the crank rocker part 24 includes a crank 241, a first connecting rod 242 and a second connecting rod 243, wherein the first connecting rod 242 and the second connecting rod 243 actually constitute a rocker, that is, the rocker mentioned above, the first end of the first connecting rod 242 and the first end of the second connecting rod 243 are fixedly connected by a rotating shaft, the rotating shaft is hinged to the support part 21, and the second end of the first connecting rod 242 and the arc toggle part 23 are connected to each other. The rod is hinged, the second end of the second connecting rod 243 is hinged to the first end of the crank 241, the output shaft of the driving motor is connected to the eccentric part of the second end of the crank 241, and is connected to the output shaft of the driving motor through the eccentric part of the second end of the crank 241. When the driving motor is started, the driving motor drives the crank 241 to move, and the crank 241 will drive the first connecting rod 242 and the second connecting rod 243 to swing, so that the first connecting rod 242 drives the second fixed rod 231 to swing, and finally the arc-shaped toggle rod drives the teeth of the ratchet 221, so that the ratchet 221 rotates in steps.

[0035] Since the two-way self-locking mechanism 2 is composed of multiple parts, there will be wear between the parts during the movement. In order to increase the life of the parts as much as possible and reduce the wear between the parts, in one embodiment, the limit rod 4 and the first fixed rod 223 are located on both sides of the pawl 222, and the pawl 222 between the limit rod 4 and the first fixed rod 223 is a first arc structure. The first arc structure can prevent the pawl 222 from getting stuck due to friction when it is re-engaged after each time it disengages from the ratchet wheel 221. The cam rotating part 25 includes a rotating wheel 251 and a protrusion 252 arranged on the outer side of the rotating wheel 251. The side edge of the protrusion 252 is a second arc structure. shaped structure, the ratchet 221 of the ratchet pawl part 22, the winding mold main body 1 and the rotation center of the winding machine 3 move synchronously, the ratchet 221 and the rotating wheel 251 are connected by a rotating rod, the rotating rod and the rotating wheel 251 are rotationally connected, the rotating rod is fixedly connected to the axis of the ratchet 221, and the limit rod 4 is lifted by the protrusion 252 to drive the pawl 222 of the ratchet pawl part 22 to disengage from the ratchet 221, and the side edge of this protrusion 252 is a second arc-shaped structure, which can ensure that when the protrusion 252 continues to rotate, it is easier to disengage from the limit rod 4, and there will be no large friction resistance with the limit rod 4, so that the whole movement is smoother and the life of the parts is increased as much as possible.

[0036] It is worth mentioning that the present application solves the problem in the prior art that at the moment when the winding machine 3 stops, inertia may cause the winding machine 3 and the winding mold to still deflect, and the unnecessary rotation of the winding mold may cause the starting position or the ending position of the coil to be inconsistent with the design requirements, thereby affecting the overall structural layout of the transformer and the coil position accuracy. In addition, the winding mold is also enabled to achieve step rotation during winding, that is, it rotates once and stops once, and the stay time is the same, so as to ensure that each rotation during the winding process is accurate, which helps to improve the overall quality of the transformer winding, and this step design is completed by the mutual cooperation of mechanical mechanisms, which can accurately control the step distance, which helps to reduce material waste, and each step of rotation is set according to actual needs, which can avoid material loss caused by unnecessary rotation and help to reduce the wear of the mechanical parts of the winding machine 3.

[0037] The working principle and use process of the present invention:

[0038] When in use, first install the winding mold body 1 on the rotation center of the winding machine 3, the rotation center of the winding machine 3 is externally connected to the driving motor, the two-way self-locking mechanism 2 is arranged between the driving motor and the rotation center of the winding machine 3, the driving motor drives the winding mold body 1 and the rotation center of the winding machine 3 to rotate synchronously through the two-way self-locking mechanism 2, when the driving motor is started, the driving shaft of the motor drives the crank 241 of the crank rocker part 24 and the crank 241 of the crank rocker part 24 to rotate synchronously, the driving motor drives the cam rotating part 25 and the crank 241 of the crank rocker part 24 to rotate, and the cam rotating part 25 drives the limit rod 4 through the protrusion 252 When the pawl 222 of the ratchet pawl part 22 is disengaged from the ratchet 221, the crank 241 will drive the first connecting rod 242 and the second connecting rod 243 to swing, so that the first connecting rod 242 drives the second fixed rod 231 to swing, and finally the arc-shaped toggle rod to toggle the teeth of the ratchet 221, so that the ratchet 221 rotates in steps, and the spring pulls the pawl 222 to engage with the ratchet 221 through reset, so that the winding mold body 1 is self-locking in both directions, avoiding the deflection of the winding machine 3 and the winding mold, ensuring that the starting position or the ending position of the coil is consistent with the design requirements, thereby improving the overall structural layout of the transformer and the coil position accuracy.

[0039] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A low-voltage foil winding mold for a dry-type transformer, characterized in that: It includes a winding mold body and a two-way self-locking mechanism connected to the winding mold body, the winding mold body is installed on the rotation center of the winding machine, the rotation center of the winding machine is externally connected to a driving motor, the two-way self-locking mechanism is arranged between the driving motor and the rotation center of the winding machine, and the driving motor drives the winding mold body and the rotation center of the winding machine to rotate synchronously through the two-way self-locking mechanism; The two-way self-locking mechanism comprises a support part, a ratchet pawl part, a toggle part, a crank rocker part and a cam rotating part arranged on the winding machine, the ratchet of the ratchet pawl part is connected to the winding mold body, a limit rod is arranged on one side of the pawl of the ratchet pawl part, the other side of the pawl of the ratchet pawl part is connected to the toggle part through a spring part, one end of the toggle part is hinged to the rocker of the crank rocker part, and the crank of the crank rocker part and the cam rotating part are both sleeved on the output end of the driving motor; The driving motor drives the cam rotating part and the crank of the crank rocker part to rotate, and the cam rotating part lifts the limit rod through the protruding part to drive the pawl of the ratchet pawl part to disengage from the ratchet, and the rocker of the crank rocker part drives the other end of the toggle part to toggle the ratchet wheel to rotate in steps, and the spring part pulls the pawl to engage with the ratchet wheel through spring reset, so that the winding mold body is self-locking in both directions.

2. A dry-type transformer low-voltage foil winding mold according to claim 1, characterized in that: The ratchet pawl part comprises a ratchet and a pawl, the teeth of the ratchet are rectangular teeth, the pawl is provided with a rectangular slot, and the rectangular teeth and the rectangular slot are meshed.

3. A dry-type transformer low-voltage foil winding mold according to claim 2, characterized in that: The toggle part is an arc-shaped toggle rod, the pawl is provided with a first fixing rod, the arc-shaped toggle rod is provided with a second fixing rod, and two ends of the spring part are respectively fixedly sleeved on the first fixing rod and the second fixing rod.

4. A dry-type transformer low-voltage foil winding mold according to claim 3, characterized in that: The crank rocker part includes a crank, a first connecting rod and a second connecting rod. The first end of the first connecting rod and the first end of the second connecting rod are fixedly connected by a rotating shaft. The rotating shaft is hinged to the support part. The second end of the first connecting rod is hinged to the arc-shaped toggle rod. The second end of the second connecting rod is hinged to the first end of the crank. The output shaft of the drive motor is connected to the eccentric point of the second end of the crank.

5. A dry-type transformer low-voltage foil winding mold according to claim 3, characterized in that: The limiting rod and the first fixing rod are located on both sides of the pawl, and a first arc-shaped structure is provided below the pawl between the limiting rod and the first fixing rod.

6. A dry-type transformer low-voltage foil winding mold according to claim 1, characterized in that: The cam rotating part comprises a rotating wheel and a protrusion arranged on the outer side of the rotating wheel, and the side edge of the protrusion is a second arc structure.

7. A dry-type transformer low-voltage foil winding mold according to claim 1, characterized in that: The number of the two-way self-locking mechanisms is two, and the two two-way self-locking mechanisms are symmetrically arranged on both sides of the winding mold.

8. A dry-type transformer low-voltage foil winding mold according to claim 6, characterized in that: The ratchet of the ratchet pawl part, the winding mold body and the rotation center of the winding machine move synchronously, the ratchet and the rotating wheel are connected by a rotating rod, the rotating rod and the rotating wheel are rotationally connected, and the rotating rod is fixedly connected to the axis of the ratchet.

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