Wire welding unit of inductance winding and welding machine

Abstract

The utility model discloses a wire welding unit of an inductor winding and welding machine, which comprises an inductor forming transverse moving mechanism used for transferring an inductor to a wire turning mechanism and bending and forming a wire rod turned by the wire turning mechanism on the inductor, and the wire turning mechanism used for turning the wire rod on the inductor by 180 degrees, the wire overturning mechanism is used for overturning wires, the welding wire cutting and carrying mechanism is used for welding the overturned wires and welding spots on the inductors, cutting the redundant wires after welding and carrying the inductors subjected to wire cutting to the discharging mechanism, and the discharging mechanism is used for discharging the inductors carried by the welding wire cutting and carrying mechanism. A series of automatic operations such as automatic overturning of wires, automatic bending forming of the wires, automatic welding and cutting of the wires, automatic discharging of inductance products and the like can be completed, the automation degree is high, operation is stable and reliable, the production efficiency and the yield are greatly improved, and cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of inductor production equipment, and more specifically to a welding wire unit of an inductor winding welding machine. Background Art

[0002] Inductor components are one of the three major components in the electronic component industry and play an extremely important role in the electronics industry. In the production process of inductor components, a winding machine is usually required. During preparation, the enameled copper wire needs to be wound on its frame by the winding machine to form a coil. After the winding is completed, the inductor needs to be manually moved to the welding machine one by one to weld the ends of the enameled copper wire to the welding points of its frame. However, the existing welding machine requires manual handling of the inductor and manual welding of the wire ends, which is troublesome and time-consuming, labor-intensive, and has low production efficiency, greatly increasing the production cost and is not conducive to production. Utility Model Content

[0003] The purpose of the utility model is to overcome the above-mentioned defects in the prior art and to provide a wire welding unit for an inductor winding welding machine which has a reasonable structural design, high efficiency and can complete a series of automated operations such as automatic turning over of wires, automatic bending and forming of wires, automatic welding and cutting of wires, and automatic unloading of inductor products.

[0004] To achieve the above-mentioned purpose, the utility model provides a wire welding unit of an inductor winding welding machine, including an inductor forming transverse movement mechanism for transferring the inductor to a wire turning mechanism and bending the wire on the inductor after being turned by the wire turning mechanism, a wire turning mechanism for flipping the wire on the inductor 180 degrees, a welding wire cutting conveying mechanism for welding the turned wire to the welding point on the inductor, cutting the excess wire after welding and conveying the inductor after cutting to a unloading mechanism, and a unloading mechanism for unloading the inductor conveyed by the welding wire cutting conveying mechanism, wherein the welding wire cutting conveying mechanism, the unloading mechanism and the wire turning mechanism are arranged in sequence, and the inductor forming transverse movement mechanism is installed between the inductor skeleton dividing mechanism and the wire turning mechanism.

[0005] Preferably, the inductive forming transverse movement mechanism includes an inductive forming clamp, a clamp mounting frame, a clamp rotation drive device, and a clamp transverse movement drive module. The inductive forming clamp is provided with a plurality of clamps and is evenly mounted on the clamp mounting frame. The clamp rotation drive device is mounted on the clamp mounting frame. The clamp rotation drive device is transmission-connected to all the inductive forming clamps and can drive them to rotate. The clamp transverse movement drive module is connected to the clamp mounting frame and can drive them to move laterally.

[0006] Preferably, the inductor forming clamp includes a clamp rotating shaft, a clamp mounting base, an inductor clamp, a wire bending and forming clamp and a wire end clamping clamp. The inductor clamp and the wire bending and forming clamp are installed on the top end of the clamp rotating shaft through the clamp mounting base, the two bending clamps of the wire bending and forming clamp are located on both sides of the two clamps of the inductor clamp, and the wire end clamping clamp is installed on one side of the inductor clamp through a mounting bracket.

[0007] Preferably, the clamp rotation drive device includes a clamp rotation drive motor, a clamp rotation synchronous wheel, and a clamp rotation synchronous belt. The clamp rotation drive motor drives the clamp rotation axes of all induction forming clamps to rotate synchronously through the clamp rotation synchronous wheel and the clamp rotation synchronous belt.

[0008] Preferably, the wire turning mechanism includes an XYZ-axis wire turning moving module, a wire clamp mounting frame, a wire clamp rotating seat, a wire turning clamp and a wire turning rotation drive device. The XYZ-axis wire turning moving module is transmission connected to the wire clamp mounting frame and can drive it to move in the XYZ three-axis directions. The wire turning clamps are provided with a plurality of wire turning clamps and are rotationally connected to the wire clamp mounting frame through their respective wire clamp rotating seats. The wire turning rotation drive device is installed on the wire clamp mounting frame. The wire turning rotation drive device is transmission connected to all wire turning clamps and can drive them to rotate.

[0009] Preferably, the XYZ-axis wire turning moving module includes a module bracket, an X-axis wire turning moving motor, an X-axis wire turning moving lead screw, an X-axis screw seat, an X-axis wire turning moving plate, a Z-axis lifting cylinder, a Z-axis lifting plate, a Y-axis wire turning moving motor, a Y-axis wire turning moving lead screw, a Y-axis screw seat, and a Y-axis wire turning moving plate. The X-axis wire turning moving motor is installed on the module bracket, and the X-axis wire turning moving motor is connected to the X-axis screw seat installed at the bottom of the X-axis wire turning moving plate through the X-axis wire turning moving lead screw, thereby Drive the X-axis wire turning moving plate to move along the X-axis direction, the Z-axis lifting cylinder is installed on the X-axis wire turning moving plate, the Z-axis lifting cylinder is connected to the Z-axis lifting plate and can drive it to move up and down, the Y-axis wire turning moving motor is installed on the Z-axis lifting plate, the Y-axis wire turning moving motor is connected to the Y-axis screw seat installed at the bottom of the Y-axis wire turning moving plate through the Y-axis wire turning moving lead screw, thereby driving the Y-axis wire turning moving plate to move along the Y-axis direction, and the wire clamp mounting frame is installed on the Y-axis wire turning moving plate.

[0010] Preferably, the wire turning rotation drive device includes a wire turning rotation drive motor, a wire turning rotation synchronous wheel, and a wire turning rotation synchronous belt. The wire turning rotation drive motor drives all the wire clamp rotating seats to rotate synchronously through the wire turning rotation synchronous wheel and the wire turning rotation synchronous belt.

[0011] Preferably, a waste wire collecting pipe is provided below each wire turning clamp.

[0012] Preferably, the welding wire cutting and transporting mechanism includes an XZ-axis welding wire moving module, a welding mounting plate, a welding mounting seat, a welder, a cutter and a blanking suction cup. The welding mounting plate is installed on the Z-axis of the XZ-axis welding wire moving module. The welding mounting seat is provided with a plurality of and is evenly installed on the welding mounting plate. The welder, the cutter and the blanking suction cup are all installed on each welding mounting seat. The cutter is located between the welder and the blanking suction cup. The welder is connected to the electric welder via a wire.

[0013] Preferably, the unloading mechanism includes a unloading bracket, a unloading belt, a pulley, a belt rotation driving device, a material pipe fixing plate, a plurality of unloading pipes and a material receiving container. The unloading belt is installed on the unloading bracket through pulleys at both ends, the belt rotation driving device is connected to one of the pulleys, all unloading pipes are connected to the material pipe fixing plate, all unloading pipes are longitudinally installed on the top of the unloading bracket and above the unloading belt, and the material receiving container is located below the discharge end of the unloading belt.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] The utility model has a reasonable structural design and is equipped with an inductor forming transverse movement mechanism, a wire turning mechanism, a welding and cutting conveying mechanism and a feeding mechanism. It can complete a series of automated operations such as automatic turning over of wires, automatic bending and forming of wires, automatic welding and cutting of wires, and automatic feeding of inductor products. It has a high degree of automation and stable and reliable operation, which greatly improves production efficiency and yield rate and reduces costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 It is a schematic diagram of the structure of a wire welding unit of an induction wire winding welding machine;

[0018] Figure 2 It is a structural schematic diagram of the inductive forming transverse shifting mechanism;

[0019] Figure 3 It is a schematic diagram of the structure of the inductor forming clamp;

[0020] Figure 4This is an enlarged view of the partial structure of the inductor forming clamp;

[0021] Figure 5 This is the structural diagram of the turning mechanism Figure 1 ;

[0022] Figure 6 This is the structural diagram of the turning line mechanism Figure 2 ;

[0023] Figure 7 It is a structural schematic diagram of the welding tangent handling mechanism;

[0024] Figure 8 It is a partial structural diagram of the welding tangent handling mechanism;

[0025] Fig. 9 It is a structural diagram of the unloading mechanism. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0027] Please refer to Figure 1 The embodiment of the utility model provides a wire welding unit of an inductor winding welding machine, including an inductor forming transverse movement mechanism 10 for transferring the inductor to a wire turning mechanism and bending the wire on the inductor after being turned by the wire turning mechanism, a wire turning mechanism 11 for turning the wire on the inductor 180 degrees, a welding wire cutting conveying mechanism 12 for welding the turned wire with the welding point on the inductor, cutting the excess wire after welding and conveying the inductor after cutting to the unloading mechanism, and a unloading mechanism 13 for unloading the inductor conveyed by the welding wire cutting conveying mechanism 12. The welding wire cutting conveying mechanism 12, the unloading mechanism 13 and the wire turning mechanism 11 are arranged in sequence, and the inductor forming transverse movement mechanism 10 is installed between the inductor skeleton dividing mechanism 9 and the wire turning mechanism 11.

[0028] The various components of this embodiment are described in detail below in conjunction with the accompanying drawings.

[0029] like Figures 2 to 4As shown, the inductance forming transverse movement mechanism 10 may include an inductance forming clamp 101, a clamp mounting frame 102, a clamp rotation drive device 103, and a clamp transverse movement drive module 104. The inductance forming clamp 101 is provided with 8 and is evenly mounted on the clamp mounting frame 102. The clamp rotation drive device 103 is mounted on the clamp mounting frame 102. The clamp rotation drive device 103 is transmission-connected to all the inductance forming clamps 101 and can drive them to rotate. The clamp transverse movement drive module 104 is connected to the clamp mounting frame 102 and can drive it to move laterally.

[0030] Specifically, the inductor forming clamp 101 may include a clamp rotating shaft 1011, a clamp mounting base 1012, an inductor clamp 1013, a wire bending and forming clamp 1014 and a wire end clamping clamp 1015. The inductor clamp 1013 and the wire bending and forming clamp 1014 are installed on the top of the clamp rotating shaft 1011 through the clamp mounting base 1012. The two bending clamps of the wire bending and forming clamp 1014 are located on both sides of the two clamps of the inductor clamp 1013. The shape of the two bending clamps of the wire bending and forming clamp 1014 is roughly an inverted L shape. The wire end clamping clamp 1015 is installed on one side of the inductor clamp 1013 through a mounting bracket.

[0031] The clamp rotation drive device 103 may include a clamp rotation drive motor 1031, a clamp rotation synchronous wheel 1032, and a clamp rotation synchronous belt 1033. The clamp rotation drive motor 1031 drives the clamp rotation shaft 1011 of all inductance forming clamps 101 to rotate synchronously through the clamp rotation synchronous wheel 1032 and the clamp rotation synchronous belt 1033.

[0032] When moving materials, the inductor clamp 1013 can clamp the inductor skeleton, and the wire end clamp 1015 can clamp the wire ends of the wire on the inductor skeleton. Then the clamp transverse movement drive module 104 drives the inductor to move to the wire turning mechanism 11. The clamp rotation drive device 103 can drive the inductor clamp 1013, the wire end clamp 1015 and the inductor to rotate 90 degrees, which is convenient for the wire turning mechanism 11 to turn the wire.

[0033] When the wire turning clamp 114 of the wire turning mechanism 11 clamps the wire end of the wire on the inductor skeleton, the wire end clamp 1015 releases the wire end. When the wire turning clamp 114 of the wire turning mechanism 11 flips the wire end 180 degrees to the other side, the two bending clamps of the wire bending and forming clamp 1014 are closed, thereby bending and shaping the bending part of the wire.

[0034] Such as 5 and Figure 6As shown in the figure, the wire turning mechanism 11 may include an XYZ-axis wire turning moving module 111, a wire clamp mounting frame 112, a wire clamp rotating seat 113, a wire turning clamp 114 and a wire turning rotation drive device 115. The XYZ-axis wire turning moving module 111 is transmission-connected to the wire clamp mounting frame 112 and can drive it to move in the XYZ three-axis directions. There are 8 wire turning clamps 114, which are respectively rotationally connected to the wire clamp mounting frame 112 through their respective wire clamp rotating seats 113. The wire turning rotation drive device 115 is installed on the wire clamp mounting frame 112. The wire turning rotation drive device 115 is transmission-connected to all the wire turning clamps 114 and can drive them to rotate.

[0035] The XYZ axis turning line moving module 111 may include a module bracket 1111, an X axis turning line moving motor 1112, an X axis turning line moving lead screw 1113, an X axis screw seat 1114, an X axis turning line moving plate 1115, a Z axis lifting cylinder 1116, a Z axis lifting plate 1117, a Y axis turning line moving motor 1118, a Y axis turning line moving lead screw 1119, a Y axis screw seat 1120, and a Y axis turning line moving plate 1121. The X axis turning line moving motor 1112 is mounted on the module bracket 1111, and the X axis turning line moving motor 1112 is connected to the X axis screw seat 1111 installed at the bottom of the X axis turning line moving plate 1115 via the X axis turning line moving lead screw 1113. 4 transmission connection, thereby driving the X-axis wire turning moving plate 1115 to move along the X-axis direction, the Z-axis lifting cylinder 1116 is installed on the X-axis wire turning moving plate 1115, the Z-axis lifting cylinder 1116 is connected to the Z-axis lifting plate 1117 and can drive it to move up and down, the Y-axis wire turning moving motor 1118 is installed on the Z-axis lifting plate 1117, the Y-axis wire turning moving motor 1118 is connected to the Y-axis screw seat 1120 installed at the bottom of the Y-axis wire turning moving plate 1121 through the Y-axis wire turning moving lead screw 1119, thereby driving the Y-axis wire turning moving plate 1121 to move along the Y-axis direction, and the wire clamp mounting frame 112 is installed on the Y-axis wire turning moving plate 1121.

[0036] The wire turning rotation driving device 115 may include a wire turning rotation driving motor 1151, a wire turning rotation synchronous wheel 1152, and a wire turning rotation synchronous belt 1153. The wire turning rotation driving motor 1151 drives all the wire clamp rotating seats 113 to rotate synchronously through the wire turning rotation synchronous wheel 1152 and the wire turning rotation synchronous belt 1153.

[0037] In addition, preferably, a waste wire collection pipe 1122 can be respectively provided below each wire turning clamp 114. After the welding wire cutting and conveying mechanism 12 cuts the wire, the wire turning clamp 114 can throw the cut wire ends (waste wires) into the waste wire collection pipe 1122.

[0038] Driven by the XYZ-axis wire turning moving module 111, each wire turning clamp 114 can be moved to the corresponding inductor forming clamp 101 respectively, and the wire turning clamp 114 can clamp the wire end clamped by the wire end clamp 1015. Driven by the wire turning rotating drive device 115, the wire turning clamp 114 can clamp the wire end and flip it 180 degrees.

[0039] like Figure 7 and Figure 8 As shown, the welding wire cutting and transporting mechanism 12 may include an XZ-axis welding wire moving module 121, a welding mounting plate 122, a welding mounting seat 123, a welder 124, a cutter 125 and a material discharge suction cup 126. The welding mounting plate 122 is installed on the Z-axis of the XZ-axis welding wire moving module 121. Eight welding mounting seats 123 are provided and are evenly installed on the welding mounting plate 122. The welder 124, the cutter 125 and the material discharge suction cup 126 are all installed on each welding mounting seat 123. The cutter 125 is located between the welder 124 and the material discharge suction cup 126. The welder 124 is connected to various existing electric welding machines through wires.

[0040] When the wire turning mechanism 11 completes the wire turning and the two bending clamps of the wire bending and forming clamp 1014 bend the bending part of the wire to shape it, the welder 124 is moved to the welding point position of the inductor skeleton under the drive of the XZ axis welding wire moving module 121 to weld the welding points of the wire and the inductor skeleton, and then the cutter 125 cuts off the excess wire, and then the unloading suction cup 126 sucks the cut inductor to the unloading mechanism 13.

[0041] like Fig. 9 As shown, the unloading mechanism 13 may include an unloading bracket 131, an unloading belt 132, a pulley 133, a belt rotation driving device 134, a material tube fixing plate 135, 8 unloading tubes 136 and a material receiving container 137. The unloading belt 132 is installed on the unloading bracket 131 through the pulleys 133 at both ends. The belt rotation driving device 134 is connected to one of the pulleys 133. All unloading tubes 136 are connected to the material tube fixing plate 135. All unloading tubes 136 are longitudinally installed on the top of the unloading bracket 131 and are located above the unloading belt 132. The material receiving container 137 is located below the discharge end of the unloading belt 132. The belt rotation driving device 134 can be set as a belt rotation driving motor.

[0042] When the unloading suction cup 126 of the welding tangent handling mechanism 12 sucks the tangent inductor into the unloading tube 136, the inductor can fall from the unloading tube 136 to the unloading belt 132. Driven by the belt rotation drive device 134, the inductor will be transported by the unloading belt 132 to the receiving container 137 for collection.

[0043] In summary, the utility model has a reasonable structural design and can complete a series of automated operations such as automatic flipping of wires, automatic bending and forming of wires, automatic welding and cutting of wires, and automatic unloading of inductor products. It has a high degree of automation and stable and reliable operation, which greatly improves production efficiency and yield rate and reduces costs.

[0044] The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited by the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principle of the present invention should be equivalent replacement methods and are included in the protection scope of the present invention.

Claims

1. A wire bonding unit for an induction wire welding machine, characterized in that: The invention comprises an inductor forming transverse movement mechanism for transferring the inductor to a wire turning mechanism and bending the wire on the inductor after being turned by the wire turning mechanism, a wire turning mechanism for turning the wire on the inductor 180 degrees, a welding wire cutting transport mechanism for welding the turned wire to the welding point on the inductor, cutting the excess wire after welding and transporting the inductor after cutting to a material discharge mechanism, and a material discharge mechanism for unloading the inductor transported by the welding wire cutting transport mechanism. The welding wire cutting transport mechanism, the material discharge mechanism and the wire turning mechanism are arranged in sequence, and the inductor forming transverse movement mechanism is installed between the inductor skeleton material dividing mechanism and the wire turning mechanism.

2. The wire bonding unit of an induction wire welding machine according to claim 1, characterized in that: The inductive forming transverse movement mechanism includes an inductive forming clamp, a clamp mounting frame, a clamp rotation drive device, and a clamp transverse movement drive module. The inductive forming clamp is provided with a plurality of clamps and is evenly mounted on the clamp mounting frame. The clamp rotation drive device is mounted on the clamp mounting frame. The clamp rotation drive device is transmission-connected to all the inductive forming clamps and can drive them to rotate. The clamp transverse movement drive module is connected to the clamp mounting frame and can drive them to move laterally.

3. The wire bonding unit of the induction wire welding machine according to claim 2, characterized in that: The inductor forming clamp includes a clamp rotating shaft, a clamp mounting base, an inductor clamp, a wire bending and forming clamp and a wire end clamping clamp. The inductor clamp and the wire bending and forming clamp are installed on the top of the clamp rotating shaft through the clamp mounting base. The two bending clamps of the wire bending and forming clamp are located on both sides of the two clamps of the inductor clamp, and the wire end clamping clamp is installed on one side of the inductor clamp through a mounting bracket.

4. The wire bonding unit of an induction wire welding machine according to claim 2, characterized in that: The clamp rotation drive device includes a clamp rotation drive motor, a clamp rotation synchronous wheel, and a clamp rotation synchronous belt. The clamp rotation drive motor drives the clamp rotation axes of all induction forming clamps to rotate synchronously through the clamp rotation synchronous wheel and the clamp rotation synchronous belt.

5. The wire bonding unit of an induction wire welding machine according to claim 1, characterized in that: The wire turning mechanism includes an XYZ-axis wire turning moving module, a wire clamp mounting frame, a wire clamp rotating seat, a wire turning clamp and a wire turning rotation driving device. The XYZ-axis wire turning moving module is transmission-connected to the wire clamp mounting frame and can drive it to move in the XYZ three-axis directions. The wire turning clamps are provided with a plurality of wire turning clamps and are rotationally connected to the wire clamp mounting frame through their respective wire clamp rotating seats. The wire turning rotation driving device is installed on the wire clamp mounting frame. The wire turning rotation driving device is transmission-connected to all wire turning clamps and can drive them to rotate.

6. The wire bonding unit of the induction wire welding machine according to claim 5, characterized in that: The XYZ-axis wire turning moving module includes a module bracket, an X-axis wire turning moving motor, an X-axis wire turning moving lead screw, an X-axis screw seat, an X-axis wire turning moving plate, a Z-axis lifting cylinder, a Z-axis lifting plate, a Y-axis wire turning moving motor, a Y-axis wire turning moving lead screw, a Y-axis screw seat, and a Y-axis wire turning moving plate. The X-axis wire turning moving motor is installed on the module bracket, and the X-axis wire turning moving motor is connected to the X-axis screw seat installed at the bottom of the X-axis wire turning moving plate through the X-axis wire turning moving lead screw, thereby driving the X-axis wire turning moving plate to move along the X-axis direction, the Z-axis lifting cylinder is installed on the X-axis wire turning moving plate, the Z-axis lifting cylinder is connected to the Z-axis lifting plate and can drive it to move up and down, the Y-axis wire turning moving motor is installed on the Z-axis lifting plate, and the Y-axis wire turning moving motor is connected to the Y-axis screw seat installed at the bottom of the Y-axis wire turning moving plate through the Y-axis wire turning moving lead screw, thereby driving the Y-axis wire turning moving plate to move along the Y-axis direction, and the wire clamp mounting frame is installed on the Y-axis wire turning moving plate.

7. The wire bonding unit of the induction wire welding machine according to claim 5, characterized in that: The wire turning rotation driving device comprises a wire turning rotation driving motor, a wire turning rotation synchronous wheel and a wire turning rotation synchronous belt. The wire turning rotation driving motor drives all the wire clamp rotating seats to rotate synchronously through the wire turning rotation synchronous wheel and the wire turning rotation synchronous belt.

8. The wire bonding unit of an induction wire welding machine according to claim 5, characterized in that: A waste wire collecting pipe is arranged under each wire turning clamp.

9. The wire bonding unit of an induction wire welding machine according to claim 1, characterized in that: The welding wire cutting and transporting mechanism includes an XZ-axis welding wire moving module, a welding mounting plate, a welding mounting seat, a welder, a cutter and a blanking suction cup. The welding mounting plate is installed on the Z-axis of the XZ-axis welding wire moving module. The welding mounting seats are provided with a plurality of and are evenly installed on the welding mounting plate. The welder, the cutter and the blanking suction cup are all installed on each welding mounting seat. The cutter is located between the welder and the blanking suction cup. The welder is connected to the electric welder through a wire.

10. The wire bonding unit of an induction wire welding machine according to claim 1, characterized in that: The unloading mechanism includes a unloading bracket, a unloading belt, a pulley, a belt rotation driving device, a material pipe fixing plate, a plurality of unloading pipes and a material receiving container. The unloading belt is installed on the unloading bracket through pulleys at both ends. The belt rotation driving device is connected to one of the pulleys. All unloading pipes are connected to the material pipe fixing plate. All unloading pipes are longitudinally installed on the top of the unloading bracket and are located above the unloading belt. The material receiving container is located below the discharge end of the unloading belt.

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