CN114005659B - Electromagnetic riveting coil structure and processing method - Google Patents

Abstract

The present invention provides an electromagnetic riveting coil structure, including a riveting punch, on which a round table is arranged, and a plurality of the round tables are arranged in steps, and each round table is connected to the coil through a driving piece, and two adjacent The two coils are connected through a connecting mechanism, the connecting mechanism includes an insulating shell, a metal wire frame is embedded in the insulating shell, a wedge is arranged in the metal wire frame, and a center block is arranged between the two wedges, so that The center block is connected to the insulating shell through bolts, and the two wedges are driven by the center block to move to the metal wire frame, and clamp the coil extension wires used to connect two adjacent coils; the electromagnetic riveted coil structure provided by the present invention Reasonable structure, convenient disassembly and assembly, can greatly reduce the stress in the coil and improve the life of the coil.

Description

Electromagnetic riveting coil structure and processing method

technical field

The invention belongs to the technical field of electromagnetic riveting, and in particular relates to an electromagnetic riveting coil structure and a processing method.

Background technique

Electromagnetic riveting technology is mainly used in aerospace and automotive fields. Electromagnetic riveting equipment converts electrical energy into mechanical energy to generate riveting force, and then impacts the rivet to form a riveting structure. In the electromagnetic riveting equipment, the coil is the core component, and the coil bears the riveting reaction force and the thermal effect of the current at the same time, so it is easily damaged. It takes time and effort to replace the damaged sensor, which greatly hinders the promotion of the application of electromagnetic riveting.

Chinese Patent No. CN109545525A discloses a flat coil of electromagnetic riveting equipment and its manufacturing method, that is, the wires are sequentially wound on the coil frame, and epoxy resin is used to fix the wires. The wire at the center is not fixed firmly, and it is easy to deform under the action of Lorentz force, which will destroy the coil skeleton made of bakelite. At the same time, excessive deformation will destroy the insulating layer with low toughness, generate partial discharge in the coil, reduce the service life of the coil and affect production safety; Chinese Patent No. CN111009378A discloses a high-strength parallel pulse magnet device. For the three parts, the coil unit is axially separated by the second reinforcing plate, and the three sub-coils are connected in parallel to increase the magnetic field strength. It adopts a longitudinally separated structure, which is difficult to couple with the driving piece to generate riveting force, which reduces the riveting efficiency.

Therefore, it is necessary to design a new coil structure, which can reduce the stress in the coil while ensuring the riveting force and riveting energy utilization rate, improve the life of the coil, improve the use efficiency of the coil, and reduce the production cost.

Contents of the invention

The technical problem to be solved by the present invention is to provide an electromagnetic riveted coil structure with reasonable structure, convenient disassembly and assembly, which can greatly reduce the stress in the coil and improve the service life of the coil.

In order to achieve the above object, the technical solution of the present invention is as follows, an electromagnetic riveting coil structure, including a riveting punch, the riveting punch is provided with a circular platform, a plurality of the circular platforms are arranged in steps, and each circular platform passes through the driving piece It is connected with the coil, and the two adjacent coils are connected by a connecting mechanism. The connecting mechanism includes an insulating shell, and a metal wire frame is embedded in the insulating shell, and a wedge is arranged in the metal wire frame. Two wedges There is a center block between them, and the center block is connected to the insulating shell through bolts, and the two wedges are driven by the center block to move toward the metal wire frame, and clamp the coil extension wires used to connect two adjacent coils.

Preferably, the coil includes an upper layer coil, a middle layer coil and a lower layer coil, and the driving piece includes an upper layer driving piece, a middle layer driving piece and a lower layer driving piece, and the three circular platforms are respectively driven by the upper layer driving piece, the middle layer driving piece and the lower layer driving piece. The sheet is connected with an upper layer coil, a middle layer coil and a lower layer coil, and the upper layer coil is connected with the middle layer coil and the middle layer coil is connected with the lower layer coil through a connecting mechanism.

Preferably, the upper layer coil, the middle layer coil and the lower layer coil all include a coil bobbin and a helical sheet coil, and the helical sheet coil is fixed to the driving piece through the bobbin.

Preferably, the thickness of the spiral sheet coil is 2-3 mm.

Preferably, the outer diameters of the upper driving piece, the middle driving piece and the lower driving piece increase sequentially.

The present invention also provides a processing method for an electromagnetic riveted coil structure, comprising the following steps:

Coil processing: Three spiral sheet coils with different diameters are processed by helical wire cutting;

Coil casting: cast epoxy resin in the gap of the spiral chip coil to fill the insulating part;

Coil bobbin processing: process the corresponding coil bobbin according to the shape of the cast spiral sheet coil;

Coil installation: fix the driving piece on the round table of the riveting punch, and the spiral sheet coil is connected to the corresponding driving piece through the coil skeleton;

Coil connection: Put the three helical sheet coils that have been cast into the corresponding coil skeleton, take out the central block of the connection mechanism, and then insert the two adjacent coil extension wires into the gap between the metal wire frame and the wedge , insert the central block into the middle of the two wedges, tighten the bolts to form a tower coil, and the two ends of the tower coil are connected to the discharge circuit through the wires extending from the coil.

Preferably, for the coil casting, first fix the spiral sheet coil on the first mold, pour the exposed half, then take the spiral sheet coil out of the first mold, turn it over and put it into the second mold, and cast the exposed half. the other half.

Preferably, the coil processing utilizes cylindrical metal material to be cut according to a helical line.

Preferably, the discharge circuit includes a capacitor bank connected in series with the tower coil through an inductor, a resistor and a switch.

The beneficial effect of the present invention is that the use of split tower coils can greatly reduce the thermal stress in the coil, enhance the fatigue life of the coil, and improve the life of the coil; when the coil is partially discharged, only part of the coil is replaced, which can improve the efficiency of the coil. High use efficiency, low cost, reasonable structure, convenient disassembly and assembly, and also has the advantages of easy modularization.

Description of drawings

FIG. 1 is a schematic structural view of one embodiment of the present invention;

Fig. 2 is a schematic structural view of the upper driver sheet shown in Fig. 1;

Fig. 3 is a structural schematic diagram of the connecting mechanism shown in Fig. 1;

Fig. 4 is a schematic structural diagram of the central block shown in Fig. 1;

Fig. 5 is the structural representation of the first mould;

Fig. 6 is the structural representation of the second mould;

Fig. 7 is a schematic flow chart of casting epoxy resin with spiral chip coil;

FIG. 8 is a schematic diagram of circuit connection of the embodiment shown in FIG. 1 .

In the figure, 101, coil extension wire; 102, inductance; 103, resistance; 104, capacitor bank; 105, switch; 10, upper coil; 20, middle coil; 201, coil skeleton; 202, spiral sheet coil ; 203, the first layer of epoxy; 204, the second layer of epoxy; 30, the lower coil; 40, the upper driver piece; 50, the middle driver piece; 60, the lower driver piece; 70, riveting punch; 71, round table; 80, the first mold; 801, the first groove; 802, the side wall; 81, the second mold; 811, the second groove; 90, the connection mechanism; 901, the insulating shell; 902, the metal wire frame; 903, the wedge block; 904, center block; 905, bolt.

Detailed ways

Below in conjunction with accompanying drawing and specific embodiment, technical solution of the present invention is described further in detail:

Please refer to Figures 1-8 together. The electromagnetic riveting coil structure provided in this embodiment includes a riveting punch 70, and a round platform 71 is arranged on the riveting punch 70. A plurality of the round platforms 71 are arranged in steps, each The round table 71 is connected to the coil through the driving piece, and the two adjacent coils are connected through the connection mechanism 90. The connection mechanism 90 includes an insulating shell 901, and the insulating shell 901 is embedded with a metal wire frame 902, and the metal wire frame 902 is provided with a wedge 903, and a central block 904 is provided between the two wedges 903. The central block 904 is connected to the insulating shell 901 through bolts 905. The two wedges 903 are driven by the central block 904 to the metal wire The frame 902 moves to clamp the coil extension wires 101 used to connect two adjacent coils.

The metal wire frame 902 is a copper wire frame. When connecting, first insert the coil extension wire 101 into the insulating shell 901 and the metal wire frame 902, then put the wedge 903 and the center wedge 904 into it, and then use the 905 bolt Lock to form a self-locking structure. When removing the coil, first unscrew the bolt 905, and then pull out the wire 101 extending from the coil; it can realize the convenient disassembly and assembly of the coil, and at the same time, avoid the bolt connection at the wire, thereby reducing the The occurrence of sparking phenomenon is safe and reliable, and can increase the life of the coil; the split-type multi-layer coil is connected to form a tower coil, which can greatly reduce the thermal stress in the coil, enhance the fatigue life of the coil, and further improve the life of the coil; The two adjacent layers of coils are connected by a connecting mechanism 90, and only part of the coils are replaced when the coils are partially discharged, which can improve the use efficiency of the coils, reduce costs, and has the advantages of reasonable structure, convenient disassembly and assembly, and easy modularization.

More specifically, in this embodiment, the coil includes an upper layer coil 10, a middle layer coil 20, and a lower layer coil 30, and the driving piece includes an upper layer driving piece 40, a middle layer driving piece 50, and a lower layer driving piece 60, and the three The round table 71 is connected with the upper coil 10, the middle coil 20 and the lower coil 30 through the upper driving piece 40, the middle driving piece 50 and the lower driving piece 60 respectively, and the upper coil 10 and the middle coil 20 and the middle coil 20 and the lower coil 30 are all connected by The mechanism 90 is connected to form a tower coil, and the two ends of the tower coil are connected to the discharge circuit through the coil extension wire 101. The discharge circuit includes a capacitor bank 104, and the capacitor bank 104 is connected in series with the tower coil through the inductor 102, the resistor 103 and the switch 105; After the capacitor bank 104 is charged, the switch 105 is turned on, and the capacitor bank 104 discharges to the coil to form an RLC circuit. The three coils are connected in series, and a pulse current is passed inside; each coil interacts with its corresponding driving plate to generate riveting force. The driving piece is fixed on the punch to complete the riveting process, which can greatly reduce the thermal stress in the coil and enhance the fatigue life of the coil.

More specifically, the upper layer coil 10 , the middle layer coil 20 and the lower layer coil 30 all include a bobbin 201 and a helical sheet coil 202 , and the helical sheet coil 202 is fixed on the driving chip through the bobbin 201 .

More specifically, the thickness of the spiral sheet coil 202 is 2-3mm.

More specifically, the outer diameters of the upper driving plate 40 , the middle driving plate 50 and the lower driving plate 60 increase sequentially.

The present invention also provides a processing method for an electromagnetic riveted coil structure, comprising the following steps:

Coil processing: three spiral sheet coils 202 with different diameters are processed by helical wire cutting;

Coil casting: epoxy resin is cast in the gap of the spiral chip coil 202, and the insulating part is filled;

Coil bobbin processing: process the corresponding bobbin 201 according to the shape of the cast spiral sheet coil 202;

Coil installation: fix the driving piece on the round platform 71 of the riveting punch 70, and the spiral sheet coil 202 is connected to the corresponding driving piece through the coil skeleton 201;

Coil connection: put the three helical sheet coils 202 that have been cast into the corresponding coil frame 201, take out the central block 904 of the connection mechanism 90, and then insert the two adjacent coil extension wires 101 into the metal wire frame 902 and the wedge 903, insert the central block 904 between the two wedges 903, tighten the bolt 905 to form a tower coil, which can realize the convenient disassembly and assembly of the coil, and at the same time, avoid the bolt connection at the wire. Thereby reducing the occurrence of sparking phenomenon and improving the life of the coil; both ends of the tower coil are connected to the discharge circuit through the coil extending wire 101;

More specifically, for the coil casting, the helical sheet coil 202 is first fixed on the first mold 80, and the first mold 80 is provided with a groove 801 for matching with the helical sheet coil 202, and the first groove The depth of 801 is not greater than the height of the spiral sheet coil 202, the outer circumference of the first mold 80 is provided with a side wall 802, the height of the side wall 802 is not less than the height difference between the spiral sheet coil 202 and the first groove 801 , insert the spiral chip coil 202 into the first groove 801, and cast the first layer of epoxy 203 on the part of the spiral chip coil 202 protruding from the first groove 801; after the first layer of epoxy 203 is cured, the spiral The type sheet coil 202 is taken out from the first mold 80, turned over and put into the second mold 81, and the second mold 81 is provided with a second groove 811, and the height of the second groove 811 is not less than that of the spiral type sheet coil 202. height, put the first layer of epoxy 203 into the second groove 811, cast the second layer of epoxy 204 on the exposed part of the casting spiral chip coil 202, take out the second layer of epoxy 204 after curing, and divide it into two The single casting can significantly reduce the coil deformation caused by canning and improve the coil life;

More specifically, the coil processing utilizes the cylindrical metal material to be cut according to the helical line, and the accuracy of the line cutting needs to be ensured.

More specifically, the discharge circuit includes a capacitor bank 104 connected in series with the tower coil through an inductor 102 , a resistor 103 and a switch 105 .

The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: it can still be described in the foregoing embodiments Modifications are made to the recorded technical solutions, or equivalent replacements are made to some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims (8)

1. An electromagnetism riveting coil structure, its characterized in that: the wire coil winding device comprises a riveting punch (70), wherein a round table (71) is arranged on the riveting punch (70), a plurality of round tables (71) are arranged in a stepped mode, each round table (71) is connected with a coil through a driving piece, two adjacent coils are connected through a connecting mechanism (90), the connecting mechanism (90) comprises an insulating shell (901), a metal wire frame (902) is embedded in the insulating shell (901), a wedge block (903) is arranged in the metal wire frame (902), a center block (904) is arranged between the two wedge blocks (903), the center block (904) is connected with the insulating shell (901) through bolts (905), and the two wedge blocks (903) are driven to move towards the metal wire frame (902) through the center block (904) and are used for clamping coil overhanging wires (101) of two adjacent coils;

the coil comprises an upper coil (10), a middle coil (20) and a lower coil (30), wherein the driving piece comprises an upper driving piece (40), a middle driving piece (50) and a lower driving piece (60), three round platforms (71) are respectively connected with the upper coil (10), the middle coil (20) and the lower coil (30) through the upper driving piece (40), the middle driving piece (50) and the lower driving piece (60), and the upper coil (10) is connected with the middle coil (20) and the lower coil (30) through connecting mechanisms (90).

2. The electromagnetic rivet coil structure of claim 1, wherein: the upper layer coil (10), the middle layer coil (20) and the lower layer coil (30) comprise a coil framework (201) and a spiral sheet coil (202), and the spiral sheet coil (202) is fixed on a driving sheet through the coil framework (201).

3. The electromagnetic rivet coil structure of claim 2, wherein: the thickness of the spiral sheet coil (202) is 2-3mm.

4. The electromagnetic rivet coil structure of claim 1, wherein: the outer diameters of the upper layer driving piece (40), the middle layer driving piece (50) and the lower layer driving piece (60) are sequentially increased.

5. A method of processing the electromagnetic rivet coil structure as set forth in claim 1, comprising the steps of:

coil processing: processing by adopting a spiral line cutting mode to obtain three spiral sheet coils with different diameters;

and (3) coil casting: epoxy resin casting is carried out on the gaps of the spiral sheet-shaped coils, and insulating parts are filled;

coil skeleton processing: processing a corresponding coil framework according to the shape of the cast spiral sheet coil;

and (3) coil installation: fixing the driving piece on a round table of a riveting punch, and connecting the spiral sheet coil with the corresponding driving piece through a coil framework;

and (3) coil connection: and (3) placing the three spiral sheet coils after casting into corresponding coil frameworks, taking out the central blocks of the connecting mechanisms, inserting the adjacent two coil overhanging wires into gaps between the metal wire frames and the wedge blocks, inserting the central blocks between the two wedge blocks, and screwing bolts to form a tower-type coil, wherein two ends of the tower-type coil are connected with a discharge circuit through the coil overhanging wires.

6. The method of processing an electromagnetic rivet coil structure as set forth in claim 5, wherein: the coil is cast, the spiral sheet coil is fixed on a first die, one half of the exposed coil is cast, the spiral sheet coil is taken out of the first die, the spiral sheet coil is put into a second die in a turnover mode, and the other half of the exposed coil is cast.

7. The method of processing an electromagnetic rivet coil structure as set forth in claim 5, wherein: the coil processing uses a cylindrical metal material cut in accordance with a spiral line.

8. The method of processing an electromagnetic rivet coil structure as set forth in claim 5, wherein: the discharging circuit comprises a capacitor bank, and the capacitor bank is connected with the tower coil in series through an inductor, a resistor and a switch.

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