CN113628867A - Manufacturing frame, manufacturing device and manufacturing method of transformer iron core - Google Patents

Abstract

The invention discloses a manufacturing frame of a transformer iron core, which comprises an upper clamping piece for clamping an upper iron yoke iron sheet, a lower clamping piece for clamping a lower iron yoke iron sheet, and a first connecting rod for connecting the upper clamping piece and the lower clamping piece; an upper top plate and a lower top plate are respectively arranged at two ends of the first connecting rod, and the upper top plate and the lower top plate are both vertical to the first connecting rod; the upper clamping piece and the lower clamping piece are positioned between the upper top plate and the lower top plate; and the distance between the upper top plate and the lower top plate is consistent with the height of the transformer iron core. Due to the adoption of the technical scheme, compared with the prior art, the bending, overlapping and curing operations of the transformer iron core can be realized only by one set of equipment. In addition, by arranging the mounting frame, the three phases of the transformer iron core can be conveniently operated by using the invention respectively.

Description

Manufacturing frame, manufacturing device and manufacturing method of transformer iron core

Technical Field

The invention relates to the field of transformer cores, in particular to a manufacturing frame, a manufacturing device and a manufacturing method of a transformer core.

Background

The iron core of the transformer is a main magnetic circuit part in the transformer, the magnetic circuit of the iron core is very small, a strong induction magnetic field can be obtained through the iron core, and the iron core and a coil wound on the iron core form a complete electromagnetic induction system. The iron core comprises an iron core column sleeved with a coil and an iron yoke which does not sleeve the coil and only plays a role of closing a magnetic circuit, wherein the iron core column is formed by overlapping a plurality of iron core column iron sheets, the iron yoke is formed by overlapping a plurality of iron yoke iron sheets so as to form a hollow iron core structure, the coil is provided with two or more than two windings, the winding connected with a power supply is a primary coil, and the rest windings are secondary coils.

The three-phase transformer is formed by three single-phase transformers, and the main flux of each phase must be closed by the magnetic circuits of the other two phases, so that the three-phase magnetic circuits are related to each other. The iron core of a general three-phase transformer is in a plane structure, the lengths of magnetic circuits of three phases are different, the magnetic circuit of one phase in the middle is short, and the magnetic circuits of the other two phases are long, so that the magnetic resistance of the three phases is slightly different. When three-phase symmetrical voltage is applied externally, three-phase no-load current is unequal, the lengths of magnetic circuits are different, the directions of the magnetic circuits are different, the current of one phase in the middle is small, and the current of the other two phases is large, so that the load operation of the transformer is influenced, and a part of loss is caused.

In order to overcome the above defects, chinese patent publication No. CN110459385A discloses a transformer and an iron core thereof, in which the transformer iron core is transformed into a "Y" type structure, and each side of the "Y" type structure is formed by overlapping a plurality of bent iron yoke iron sheets side by side, thereby solving the problem of symmetrical magnetic circuits.

Chinese patent publication No. CN112259339A discloses a method and apparatus for manufacturing a transformer core with a Y-shaped structure, in which the method includes bending and folding iron yoke sheets between corresponding V-shaped protrusions and V-shaped grooves, and then curing the folded iron core units with a clamp. The disadvantages are that: the bending, folding and curing operations require the use of two different devices, respectively.

Disclosure of Invention

In order to solve the problem that two different devices are required to be used when bending, laminating and curing are carried out in the existing transformer iron core manufacturing method in the background art, the invention provides a transformer iron core manufacturing frame, and the specific technical scheme is as follows.

A manufacturing frame of a transformer iron core comprises an upper clamping piece used for clamping an upper iron yoke iron sheet, a lower clamping piece used for clamping a lower iron yoke iron sheet, and a first connecting rod connecting the upper clamping piece and the lower clamping piece; an upper top plate and a lower top plate are respectively arranged at two ends of the first connecting rod, and the upper top plate and the lower top plate are both vertical to the first connecting rod; the upper clamping piece and the lower clamping piece are positioned between the upper top plate and the lower top plate; and the distance between the upper top plate and the lower top plate is consistent with the height of the transformer iron core.

Above-mentioned structure is through setting up roof and roof down for transformer core's bending, coincide operation and solidification only need can realize through this set of equipment.

Preferably, the upper clamping piece comprises three upper outer clamping plates which are arranged at intervals in a Y shape, an upper clamping block arranged at the center of the three upper outer clamping plates and a second connecting rod; the upper clamping block is in a triangular prism shape; the three upper outer clamping plates are respectively arranged in one-to-one correspondence with three side surfaces of the upper clamping block, and are respectively connected with the three side surfaces of the upper clamping block through the second connecting rods, so that the upper iron yoke sheet is clamped between the upper outer clamping plates and the upper clamping block;

the lower clamping piece comprises three lower outer clamping plates which are arranged in a Y-shaped interval manner, a lower clamping block arranged at the center of the three lower outer clamping plates and a third connecting rod; the lower clamping block is in a triangular prism shape; the three lower outer clamping plates are respectively arranged in one-to-one correspondence with three side surfaces of the lower clamping block, and are respectively connected with the three side surfaces of the lower clamping block through the third connecting rods, so that the lower iron yoke iron sheet is clamped between the lower outer clamping plates and the lower clamping block;

and two ends of the first connecting rod are respectively connected with the upper clamping block and the lower clamping block.

Preferably, the upper outer splint and the lower outer splint have the same shape and comprise a first straight plate, a first arc plate and a second straight plate which are sequentially connected, and the included angle between the first straight plate and the second straight plate is 120 degrees;

three side surfaces of the upper clamping block and the lower clamping block are cambered surfaces; the cambered surface is concentric with the first arc plate, and the arc radius of the cambered surface

Wherein R1 is the circular arc radius of first circular arc board, and D is transformer core's thickness.

The device aims at the manufacture of the Y-shaped transformer iron core, so that the outlines of the upper outer clamping plate, the lower outer clamping plate, the upper clamping block and the lower clamping block are matched with the shape of the iron core.

Preferably, one end of the second connecting rod, which is far away from the upper clamping piece, is also connected with a first extension rod; one end of the third connecting rod, which is far away from the lower clamping piece, is also connected with a second extension rod; the surfaces of the first extension rod and the second extension rod are both provided with threads;

the middle part of the first arc plate is provided with a through hole which can be penetrated by the second connecting rod, the third connecting rod, the first extension rod or the second extension rod.

Because the side surfaces of the upper clamping block and the lower clamping block are cambered surfaces, the iron yoke iron sheets are overlapped on the clamping blocks before being bent, and a larger gap exists between the iron yoke iron sheets and the cambered surfaces, so that an extension rod needs to be arranged to make up the gap. After the bending operation of the iron yoke iron sheet is completed, the gap is filled, and at the moment, the extension rod is taken down.

Preferably, two ends of the upper outer clamping plate are provided with first bolt holes; and second bolt holes are formed in two ends of the lower outer clamping plate. From this, accessible bolt passes first bolt hole and fastens between two adjacent outer splint, and accessible bolt passes the second bolt hole and fastens between two adjacent outer splint down.

Preferably, the device also comprises a support plate, wherein the support plate comprises a third straight plate, a second arc plate and a fourth straight plate which are sequentially connected, and the included angle between the third straight plate and the fourth straight plate is 120 degrees; the arc radius of the second arc plate is consistent with the arc radius of the cambered surface; and the middle part of the second arc plate is provided with a mounting hole.

Therefore, when a phase yoke iron sheet is bent, the second arc plate of the supporting plate can be tightly attached to and penetrates through the mounting hole through the threaded fastener, the supporting plate is fixed on the arc surfaces corresponding to the upper clamping block and the lower clamping block corresponding to the other two phases, and the third straight plate and the fourth straight plate of the supporting plate can support two ends of the iron yoke iron sheet to be bent, so that the two ends of the iron yoke iron sheet are prevented from being deformed in the bending process.

Based on the same inventive concept, the invention also provides a manufacturing device of the transformer core, which comprises the manufacturing frame of the transformer core, the supporting plate and an installation frame for placing the manufacturing device of the transformer core; the mounting frame comprises a mounting seat and two brackets arranged at two ends of the mounting seat; the distance between the two brackets is smaller than the length of the first connecting rod and larger than the distance between the upper top plate and the lower top plate;

and a positioning structure is arranged between the upper top plate and/or the lower top plate and the bracket.

When the manufacturing frame is used, the manufacturing frame is horizontally placed on the mounting frame and can rotate by taking the first connecting rod as a rotating shaft. Furthermore, a positioning structure is further arranged and used for positioning the manufacturing frame on the mounting frame, and the three phases of the transformer iron core are conveniently and respectively operated.

Preferably, the positioning structure comprises three first positioning holes uniformly formed in the upper top plate and/or the lower top plate, a second positioning hole formed in the mounting bracket, and positioning pins capable of passing through the first positioning holes and the second positioning holes.

Based on the same inventive concept, the invention also provides a manufacturing method of the transformer core, which utilizes the manufacturing device of the transformer core and comprises the following steps:

s1, positioning the manufacturing frame on a mounting frame;

s2, mounting support plates on the second side and the third side of the upper clamping block and the lower clamping block; laminating and bending the upper iron yoke iron sheet and the lower iron yoke iron sheet on the first side surfaces of the upper clamping block and the lower clamping block;

s3, releasing the positioning, rotating the manufacturing frame by 120 degrees, and positioning the manufacturing frame on the mounting frame again; detaching the supporting plate arranged on the second side surfaces of the upper clamping block and the lower clamping block; laminating and bending the upper iron yoke iron sheet and the lower iron yoke iron sheet on the second side surfaces of the upper clamping block and the lower clamping block;

s4, releasing the positioning, rotating the rotated manufacturing frame again by 120 degrees, and positioning the manufacturing frame on the mounting frame again; detaching the supporting plate arranged on the third side surfaces of the upper clamping block and the lower clamping block; and the third side surfaces of the upper and lower clamping blocks are laminated and bent.

Specifically, the lamination and bending of the upper and lower iron yoke pieces comprises the following steps:

one end of a second connecting rod is connected with one side surface of the upper clamping block, and the other end of the second connecting rod is connected with the first extension rod; one end of a third connecting rod is connected with one side face of the lower clamping block, and the other end of the third connecting rod is connected with a second extension rod; one side surface of the upper clamping block and one side surface of the lower clamping block are on the same curved surface;

a plurality of upper iron yoke pieces pass through the first extension rod and the second connecting rod through holes in the middle of the upper iron yoke pieces and are sequentially stacked on one side face of the upper clamping block; a plurality of lower iron yoke iron sheets are sequentially stacked on one side surface of the lower clamping block after passing through the two extension rods and the third connecting rod through a hole in the middle of the lower iron yoke iron sheets;

the upper outer clamping plate penetrates through the first extension rod, and a nut is sleeved on the first extension rod and is screwed down to bend the upper iron yoke piece; and the lower outer clamping plate passes through the second extension rod, and the second extension rod is sleeved with a nut and screwed down so as to bend the lower iron yoke iron sheet.

Due to the adoption of the technical scheme, compared with the prior art, the bending, overlapping and curing operations of the transformer iron core can be realized only by one set of equipment. In addition, by arranging the mounting frame, the three phases of the transformer iron core can be conveniently operated by using the invention respectively.

Drawings

FIG. 1 is a schematic structural diagram of a manufacturing frame for a transformer core according to the present invention;

fig. 2 is a schematic structural view of the fixing sleeve of the present invention;

FIG. 3 is a top view of FIG. 2;

FIG. 4 is a schematic structural view of an upper clamping block of the present invention;

FIG. 5 is a top view of FIG. 4;

FIG. 6 is a schematic structural view of the upper top plate of the present invention;

FIG. 7 is a schematic structural view of the upper outer splint;

FIG. 8 is a front view of FIG. 7;

FIG. 9 is a schematic view showing the relationship between the radius of the arc surface of the first arc plate and the radius of the arc surface of the side surface of the upper clamping block according to the present invention;

FIG. 10 is a schematic structural view of a second connecting rod according to the present invention;

FIG. 11 is a front view of FIG. 10;

FIG. 12 is a cross-sectional view A-A of FIG. 11;

FIG. 13 is a schematic view of a first extension pole of the present invention;

FIG. 14 is a schematic structural view of an insulating sleeve according to the present invention;

FIG. 15 is a top view of FIG. 14;

fig. 16 is a schematic structural view of a first extension rod sleeved with an insulating sleeve;

FIG. 17 is a schematic structural diagram of a first connecting rod according to the present invention;

FIG. 18 is a schematic view of the connection relationship between the third connecting rod, the second extension rod and the lower clamping block according to the present invention;

FIG. 19 is a schematic structural view of a mount of the present invention;

fig. 20 is a schematic view showing a state in which a manufacturing frame of a transformer core according to the present invention is mounted on a mounting frame;

FIG. 21 is a schematic view of the structure of the support plate of the present invention;

FIG. 22 is a top view of FIG. 21;

fig. 23 is a schematic view showing a state in which the first phase yoke iron piece is mounted;

fig. 24 is a schematic view showing a state in which the second yoke iron piece is mounted.

Detailed Description

The present invention is described in further detail below with reference to the attached drawing figures.

Example 1

Referring to fig. 1, a manufacturing frame for a transformer core includes an upper clamp for clamping an upper yoke iron piece, a lower clamp for clamping a lower yoke iron piece, and a first connecting rod 1 for connecting the upper clamp and the lower clamp. An upper top plate 2 is arranged above the upper clamping piece, and a lower top plate 3 is arranged below the lower clamping piece. The upper top plate 2 and the lower top plate 3 are both perpendicular to the first connecting rod 1. And the distance between the upper top plate 2 and the lower top plate 3 is consistent with the height of the transformer iron core.

Specifically, the upper clamping piece includes three upper outer clamping plates 41 arranged at intervals in a Y shape and an upper clamping block 42 disposed at the center of the three upper outer clamping plates 41. The upper clamping block 42 is triangular prism shaped; the three upper outer clamping plates 41 are respectively arranged corresponding to the three side surfaces of the upper clamping blocks 42.

The lower clamping piece comprises three lower outer clamping plates 51 which are arranged at intervals in a Y shape and a lower clamping block 52 arranged at the center of the three lower outer clamping plates; the lower clamping block 52 is in the shape of a triangular prism; the three lower outer clamping plates 51 are respectively arranged corresponding to three side surfaces of the lower clamping blocks 52.

As shown in fig. 1-6, the two ends, the upper part and the lower part of the first connecting rod 1 are further provided with fixing sleeves 11, the fixing sleeves 11 are cylindrical, and the middle part of the fixing sleeves is provided with a through hole for the first connecting rod 1 to pass through. The centers of the upper clamping block 42 and the upper top plate 2 are vertically provided with through holes which can be penetrated by the first connecting rods 1, and the centers of the lower clamping block 52 and the lower top plate 3 are vertically provided with through holes which can be penetrated by the first connecting rods 1. The upper clamping block 42 and the upper top plate 2 are sandwiched by the two fixing sockets 11 located at the top end and the upper portion of the first connecting rod 1, and the lower clamping block 52 and the lower top plate 3 are sandwiched by the two fixing sockets 11 located at the bottom end and the lower portion of the first connecting rod 1. As shown in fig. 1 and 3, the side surface of the fixing sleeve 11 is provided with a screw hole 111, and the fixing sleeve 11 can be fixed to the first connecting rod 1 through the screw hole 111 by a screw, so that the position of the fixing sleeve 11 on the first connecting rod 1 can be conveniently adjusted according to the height of the iron core.

As shown in fig. 1, 4-6, the upper clamping block 42 and the upper top plate 2 are further provided with matching positioning holes 21, and the positioning pins can penetrate through the positioning holes 21 to realize the mutual positioning of the upper clamping block 42 and the upper top plate 2. The lower clamping block 52 and the lower top plate 3 are also provided with matched positioning holes 21, and the lower clamping block 52 and the lower top plate 3 can be mutually positioned by penetrating positioning pins through the positioning holes 21.

As shown in fig. 7-9, the upper outer splint 41 and the lower outer splint 51 have the same shape, and include a first straight plate 411, a first circular arc plate 412, and a second straight plate 413 connected in sequence, and an included angle between the first straight plate 411 and the second straight plate 413 is 120 °.

As shown in fig. 9 and 20, three sides of the upper clamping block 42 and the lower clamping block 52 are all arc surfaces; the cambered surface is concentric with the first arc plate, and the arc radius of the cambered surface

Wherein R1 is the circular arc radius of first circular arc board, and D is transformer core's thickness.

The sum of the thicknesses of the iron yoke iron sheets clamped between the cambered surface and the first arc plate after the iron yoke iron sheets are bent and formed.

As shown in fig. 1, 10-18, three second connecting rods 43, three third connecting rods 53, and a first extension rod 44 and a second extension rod 54 with threads on the surfaces thereof are further included.

One end of the second connecting rod 43 is provided with a first threaded end 431, and the cambered surface is provided with a first threaded hole matched with the first threaded end 431. The other end of the second connecting rod 43 is provided with a second threaded hole 432, and one end of the first extension rod 44 is provided with a second threaded end 441 matched with the second threaded hole 432. Rectangular notches are milled in both sides of the first threaded end 431 and both sides of the other end of the first extension rod 44, so that threaded connection is facilitated.

One end of the third connecting rod 53 is provided with a third threaded end 531, and the arc surface is provided with a third threaded hole matched with the third threaded end 531. The other end of the third connecting rod 53 is provided with a fourth threaded hole 532, and one end of the second extension rod 54 is provided with a fourth threaded end 541 matched with the fourth threaded hole 532. Rectangular notches are milled in both sides of the third threaded end 531 and both sides of the other end of the second extension rod 54, so that threaded connection is facilitated.

The second connecting rod 43 and the third connecting rod 53 are also sleeved with an insulating sleeve 7.

As shown in fig. 1 and 8, a through hole through which the insulating sleeve 7 can pass is formed in the middle of the first arc plate.

As shown in fig. 1 to 18, during assembly, the first threaded end 431 is screwed into the first threaded hole, so that one end of the second connecting rod 43 is connected to the side surface of the upper clamping block 42, and the second threaded end 441 is screwed into the second threaded hole 432, so that the other end of the second connecting rod 43 is connected to one end of the first extension rod 44; the third threaded end 531 is screwed into the third threaded hole, so that one end of the third connecting rod 53 is connected to the side surface of the lower clamp block 52, and the fourth threaded end 541 is screwed into the fourth threaded hole 532, so that the other end of the third connecting rod 53 is connected to one end of the first extension rod 54.

The upper and lower iron yoke iron sheets are also provided with through holes through which the insulating sleeves 7 can pass. The plurality of upper yoke pieces are sequentially passed through the first extension rod 44 and the second connecting rod 43, and after the lamination operation of the upper yoke pieces is completed, the upper outer clamping plate 41 can be passed through the second connecting rod 43 through the through hole in the middle thereof, and then fastened by the nut, so that the upper yoke pieces are bent. The plurality of lower iron yoke iron sheets sequentially pass through the second extension rod 54 and the third connecting rod 53, and after the lamination operation of the lower iron yoke iron sheets is completed, the lower outer clamping plate 51 can pass through the third connecting rod 53 through the through hole in the middle thereof, and then the lower iron yoke iron sheets are bent by fastening through nuts.

As shown in fig. 1, 7 and 8, the two ends of the upper outer clamping plate 41 are further provided with first bolt holes 411, and two adjacent upper outer clamping plates 41 can be fastened through the first bolt holes by bolts 6. The both ends of outer splint 51 still are equipped with the second bolt hole down, and accessible bolt 6 passes the second bolt hole between two adjacent outer splint 51 and fastens.

As shown in fig. 1 and 17, the top end of the first connecting rod 1 is provided with a threaded hole 12, which facilitates hoisting of the manufacturing frame.

Example 2

A manufacturing device of a transformer core comprises the manufacturing frame of the transformer core in embodiment 1, and further comprises a mounting frame for placing the manufacturing device of the transformer core. As shown in fig. 1, 19 and 20, the mounting bracket includes a mounting base 8 and two brackets 81 disposed at two ends of the mounting base; the distance between the two brackets 81 is smaller than the length of the first connecting rod 1 and larger than the distance between the upper top plate 2 and the lower top plate 3. And a positioning structure is arranged between the upper top plate 2 and the support 81 and between the lower top plate 3 and the support 81 and used for positioning the manufacturing frame on the mounting frame.

Specifically, as shown in fig. 1, 19 and 20, the positioning structure includes three first positioning holes 82 uniformly formed in the upper top plate 2 and the lower top plate 3 and three second positioning holes 83 formed in the mounting bracket, and positioning pins can be inserted between the first positioning holes 82 and the second positioning holes 83 to position the upper top plate 2 and the bracket 81 and between the lower top plate 3 and the bracket 81, i.e., to position the manufacturing rack on the mounting bracket.

Example 3

A method for manufacturing a transformer core using the apparatus for manufacturing a transformer core according to embodiment 2, comprising the steps of:

s1, positioning the manufacturing frame on a mounting frame;

s2, mounting support plates on the second side and the third side of the upper clamping block and the lower clamping block; laminating and bending the upper and lower iron yoke sheets on the first side surfaces of the upper and lower clamping blocks (as shown in fig. 23);

s3, releasing the positioning, rotating the manufacturing frame by 120 degrees, and positioning the manufacturing frame on the mounting frame again; detaching the supporting plate arranged on the second side surfaces of the upper clamping block and the lower clamping block; laminating and bending the upper iron yoke iron sheet and the lower iron yoke iron sheet on the second side surfaces of the upper clamping block and the lower clamping block (as shown in figure 24);

s4, releasing the positioning, rotating the rotated manufacturing frame again by 120 degrees, and positioning the manufacturing frame on the mounting frame again; detaching the supporting plate arranged on the third side surfaces of the upper clamping block and the lower clamping block; and the third side surfaces of the upper and lower clamping blocks are laminated and bent.

As shown in fig. 21 and 22, the supporting plate 9 includes a third straight plate 91, a second arc plate 92, and a fourth straight plate 93 connected in sequence, and an included angle between the third straight plate 91 and the fourth straight plate 93 is 120 °; the arc radius of the second arc plate 92 is identical to the arc radius of the arc surface of the upper clamping block 42, and both are R2. The middle part of the second arc plate 92 is provided with a mounting hole.

Specifically, as shown in fig. 23, the support plate 9 is mounted on the second and third side surfaces of the upper and lower clamping blocks, so that the second arc plate 92 of the support plate 9 is closely attached to the side surfaces of the upper and lower clamping blocks (the arc radii of the two arc surfaces are consistent), and then the support plate 9 is fastened to the upper and lower clamping blocks after the threaded fastener 10 passes through the mounting hole in the middle of the second arc plate 92, thereby completing the mounting. When the screw fastener 10 is disassembled, the support plate 9 is disassembled together.

Therefore, the two ends of the iron yoke iron sheet to be bent are supported by the third straight plate and the fourth straight plate of the supporting plate by means of the supporting plate when the iron yoke iron sheet is bent, and the two ends of the iron yoke iron sheet can be effectively prevented from being deformed in the bending process.

Specifically, the lamination and bending of the upper and lower iron yoke pieces comprises the following steps:

one end of a second connecting rod is connected with one side surface of the upper clamping block, and the other end of the second connecting rod is connected with the first extension rod; one end of a third connecting rod is connected with one side surface corresponding to the lower clamping block, and the other end of the third connecting rod is connected with a second extension rod; (as shown in FIG. 17);

a plurality of upper iron yoke pieces penetrate through the first extension rod and the second connecting rod through holes in the middle of the upper iron yoke pieces and are sequentially stacked on the side face of the upper clamping block; a plurality of lower iron yoke iron sheets pass through the two extension rods and the third connecting rod through holes in the middle of the lower iron yoke iron sheets and are sequentially stacked on the side face of the lower clamping block;

the upper outer clamping plate penetrates through the first extension rod, and a nut is sleeved on the first extension rod and is screwed down to bend the upper iron yoke piece; and the lower outer clamping plate passes through the second extension rod, and the second extension rod is sleeved with a nut and screwed down so as to bend the lower iron yoke iron sheet.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (10)

1. A manufacturing frame of a transformer iron core comprises an upper clamping piece used for clamping an upper iron yoke iron sheet, a lower clamping piece used for clamping a lower iron yoke iron sheet, and a first connecting rod connecting the upper clamping piece and the lower clamping piece; the method is characterized in that: an upper top plate and a lower top plate are respectively arranged at two ends of the first connecting rod, and the upper top plate and the lower top plate are both vertical to the first connecting rod; the upper clamping piece and the lower clamping piece are positioned between the upper top plate and the lower top plate; and the distance between the upper top plate and the lower top plate is consistent with the height of the transformer iron core.

2. The manufacturing frame of transformer core according to claim 1, characterized in that:

the upper clamping piece comprises three upper outer clamping plates which are arranged in a Y-shaped interval manner, an upper clamping block arranged at the center of the three upper outer clamping plates and a second connecting rod; the upper clamping block is in a triangular prism shape; the three upper outer clamping plates are respectively arranged in one-to-one correspondence with three side surfaces of the upper clamping block, and are respectively connected with the three side surfaces of the upper clamping block through the second connecting rods, so that the upper iron yoke sheet is clamped between the upper outer clamping plates and the upper clamping block;

the lower clamping piece comprises three lower outer clamping plates which are arranged in a Y-shaped interval manner, a lower clamping block arranged at the center of the three lower outer clamping plates and a third connecting rod; the lower clamping block is in a triangular prism shape; the three lower outer clamping plates are respectively arranged in one-to-one correspondence with three side surfaces of the lower clamping block, and are respectively connected with the three side surfaces of the lower clamping block through the third connecting rods, so that the lower iron yoke iron sheet is clamped between the lower outer clamping plates and the lower clamping block;

and two ends of the first connecting rod are respectively connected with the upper clamping block and the lower clamping block.

3. The manufacturing frame of transformer core according to claim 2, characterized in that: the upper outer clamping plate and the lower outer clamping plate are consistent in shape and comprise a first straight plate, a first arc plate and a second straight plate which are sequentially connected, and the included angle between the first straight plate and the second straight plate is 120 degrees;

three side surfaces of the upper clamping block and the lower clamping block are cambered surfaces; the cambered surface is concentric with the first arc plate, and the arc radius of the cambered surface

Wherein R1 is the circular arc radius of first circular arc board, and D is transformer core's thickness.

4. The manufacturing frame of transformer cores according to claim 2 or 3, characterized in that: one end of the second connecting rod, which is far away from the upper clamping piece, is also connected with a first extension rod; one end of the third connecting rod, which is far away from the lower clamping piece, is also connected with a second extension rod; the surfaces of the first extension rod and the second extension rod are both provided with threads; the second connecting rod and the third connecting rod are further sleeved with insulating sleeves, and the middle of the first arc plate is provided with a through hole which can be penetrated by the insulating sleeves.

5. The manufacturing frame of transformer cores according to claim 2 or 3, characterized in that: two ends of the upper outer clamping plate are provided with first bolt holes; and second bolt holes are formed in two ends of the lower outer clamping plate.

6. The manufacturing frame of transformer core according to claim 4, characterized in that: the supporting plate comprises a third straight plate, a second arc plate and a fourth straight plate which are sequentially connected, and the included angle between the third straight plate and the fourth straight plate is 120 degrees; the arc radius of the second arc plate is consistent with the arc radius of the cambered surface; and the middle part of the second arc plate is provided with a mounting hole.

7. A manufacturing apparatus of a transformer core comprising the manufacturing frame of a transformer core according to claims 1 to 5 and the supporting plate according to claim 6, characterized in that: the mounting frame is used for placing the manufacturing device of the transformer core; the mounting frame comprises a mounting seat and two brackets arranged at two ends of the mounting seat; the distance between the two brackets is smaller than the length of the first connecting rod and larger than the distance between the upper top plate and the lower top plate;

and a positioning structure is arranged between the upper top plate and/or the lower top plate and the bracket.

8. The apparatus for manufacturing a transformer core according to claim 7, wherein: the positioning structure comprises three first positioning holes uniformly formed in the upper top plate and/or the lower top plate, a second positioning hole formed in the mounting support and positioning pins capable of penetrating through the first positioning holes and the second positioning holes.

9. A method for manufacturing a transformer core using the apparatus for manufacturing a transformer core according to claim 7 or 8, comprising the steps of:

s1, positioning the manufacturing frame on a mounting frame;

s2, mounting support plates on the second side and the third side of the upper clamping block and the lower clamping block; laminating and bending the upper iron yoke iron sheet and the lower iron yoke iron sheet on the first side surfaces of the upper clamping block and the lower clamping block;

s3, releasing the positioning, rotating the manufacturing frame by 120 degrees, and positioning the manufacturing frame on the mounting frame again; detaching the supporting plate arranged on the second side surfaces of the upper clamping block and the lower clamping block; laminating and bending the upper iron yoke iron sheet and the lower iron yoke iron sheet on the second side surfaces of the upper clamping block and the lower clamping block;

s4, releasing the positioning, rotating the rotated manufacturing frame again by 120 degrees, and positioning the manufacturing frame on the mounting frame again; detaching the supporting plate arranged on the third side surfaces of the upper clamping block and the lower clamping block; and the third side surfaces of the upper and lower clamping blocks are laminated and bent.

10. The method of manufacturing a transformer core according to claim 9, wherein the laminating and bending of the upper and lower yokes comprises the steps of:

one end of a second connecting rod is connected with one side surface of the upper clamping block, and the other end of the second connecting rod is connected with the first extension rod; one end of a third connecting rod is connected with one side face of the lower clamping block, and the other end of the third connecting rod is connected with a second extension rod; one side surface of the upper clamping block and one side surface of the lower clamping block are on the same curved surface;

a plurality of upper iron yoke pieces pass through the first extension rod and the second connecting rod through holes in the middle of the upper iron yoke pieces and are sequentially stacked on one side face of the upper clamping block; a plurality of lower iron yoke iron sheets are sequentially stacked on one side surface of the lower clamping block after passing through the two extension rods and the third connecting rod through a hole in the middle of the lower iron yoke iron sheets;

the upper outer clamping plate penetrates through the first extension rod, and a nut is sleeved on the first extension rod and is screwed down to bend the upper iron yoke piece; and the lower outer clamping plate passes through the second extension rod, and the second extension rod is sleeved with a nut and screwed down so as to bend the lower iron yoke iron sheet.

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