An electrical discharge machining wire feeding device and a method of using the same

Abstract

The application relates to the technical field of metal cutting equipment, and discloses an electric spark machining wire feeding device and a using method thereof. In order to solve the problem of loose wire in the wire feeding process of a wire disc, in the wire feeding process of the wire disc, a coaxially-fixed gear is synchronously rotated. In the process, the meshing transmission between the gear and a gear row forces the spring to be compressed and stored, until the gear and the gear row are meshed at the end. In this way, in the wire feeding process of the wire disc, the spring compression storage makes the wire disc always have wire feeding resistance, so that the electrode is always in a tension state. When the fed electrode wire is loose, the spring elastic force forces the gear row and the gear to mesh, and drives the wire disc to reversely rotate. When the wire feeding process is loose, the reverse rotation of the wire disc can quickly tighten the electrode wire, and the effects of resistance wire feeding and reverse tight wire feeding are finally realized.

Description

Technical Field

[0001] This invention relates to the technical field of metal cutting equipment, and in particular to an electrical discharge machining wire feeding device and its usage method. Background Technology

[0002] In the fields of intelligent manufacturing and advanced fabrication, wire electrical discharge machining (EDM) occupies a unique and important position. As a special metal cutting method, it differs from traditional mechanical cutting methods. Its core principle mainly relies on the high-frequency pulse discharge phenomenon generated between the electrode wire and the workpiece. At the moment of discharge, extremely high temperatures are generated in a local area. This high temperature can rapidly melt or even vaporize the metal material, thereby achieving precise cutting of the metal workpiece.

[0003] In the actual cutting process, the cutting wire on the wire spool must first be fed to the wire storage drum using the wire feeding mechanism. After the required length of cutting wire is placed on the wire storage drum, the wire feeding is stopped, the cutting wire is then cut, and it is arranged around the support at the required cutting position before proceeding with the subsequent wire cutting work.

[0004] However, in practical applications, resistance needs to be applied to the wire spool to prevent problems such as wire tangling or feeding caused by free rotation of the wire spool. A search revealed that CN204397106U discloses a wire feeder for wire EDM. This feeder has a simple structure, with a flexible contact layer between the asbestos friction plate and the molybdenum wire spool, reducing friction between them and extending service life. Simultaneously, the asbestos friction plate prevents the wire spool from rotating freely, allowing the electrode wire to rotate with the wire spool under constraint, thus maintaining a certain tension on the electrode wire and preventing wire tangling, overlapping, or breakage due to insufficient tension.

[0005] However, while this method can increase rotational resistance during wire feeding to tension the electrode wire, in practical applications, if wire overlap occurs during wire feeding or if there are abnormalities in the wire feeding process, the length of the released electrode wire will be relatively increased. During this process, because the electrode wire is not effectively tensioned, the wire feeding will still be too loose, leading to loose winding of the wire storage cylinder or wire overlap. Summary of the Invention

[0006] This invention proposes an electrical discharge machining wire feeding device and its usage method, which has the advantages of resistance wire feeding and reverse wire tightening, in order to solve the problem of loose wire during wire feeding from the wire spool mentioned in the background art.

[0007] To achieve the above objectives, this application adopts the following technical solution: an electrical discharge machining (EDM) wire feeding device, comprising: a machine body, on which a reciprocating mechanism is mounted, and a wire storage drum driven by a motor is movably mounted on the surface of the reciprocating mechanism; a wire feeding bracket, fixed in the middle of the machine body, and on which a gear is movably mounted, with a wire spool fixedly mounted on the gear shaft, and an electrode wire wound on the outer side of the wire spool; a guide wheel, fixed to the machine body, wherein the end of the electrode wire on the wire spool is reversed by the guide wheel and fixed to the wire storage drum; and a guide slide, mounted on the side of the wire feeding bracket, and on the side of the guide slide, a gear meshing with the external teeth of the gear is mounted. The toothed rack has a pressure plate movably mounted on the top of the guide slide, and a spring is installed between the pressure plate and the guide slide. A limiting mechanism is installed at the bottom of the pressure plate to support the bottom of the pressure plate. When the electrode wire is fed, the electrode wire pulls the wire spool and drives the gear to rotate. The gear and the toothed rack mesh and drive the transmission. The moving toothed rack compresses and stores the spring through the guide slide until the top of the toothed rack moves to one side of the gear. The compressed spring uses the meshing between the toothed rack and the gear to create motion resistance when the wire spool is fed, thus completing resistance feeding. When the electrode wire is slack, the toothed rack pushed by the spring force causes the gear to drive the wire spool to rotate in the opposite direction, thus achieving reverse rotation of the wire spool to tighten the wire.

[0008] Furthermore, the gear's shaft is a stepped shaft.

[0009] Furthermore, a limiting protrusion is fixedly connected to the bottom of the toothed rack, and a limiting post is fastened to the side of the wire feeding bracket. When the wire spool is installed incorrectly, the wire spool rotates to feed the wire, and the gear causes the toothed rack to drive the limiting protrusion to abut against the limiting post, thereby limiting the rotation of the wire spool.

[0010] Furthermore, the first type of limiting mechanism includes: the pressure plate is pushed downward by the spring force, so that the bottom end of the pressure plate abuts against the top of the wire feeding bracket.

[0011] Furthermore, the second type of limiting mechanism includes: a pressing slide seat, which is movably installed on the side of the guide slide seat and is located below the pressing plate; and a support shaft, which is fixed on the surface of the pressing slide seat and has a pressing wheel movably installed on the outer side of the support shaft seat above the wire spool.

[0012] Furthermore, a warning protrusion is fixedly connected to the outer side of the wire spool, and an alarm mechanism is installed on the outer side of the support shaft.

[0013] Furthermore, after the number of electrode wires on the outer side of the wire spool decreases, the pressure roller moves closer to the wire spool, bringing the alarm mechanism and the outer side of the wire spool closer together. When the wire spool drives the warning protrusion to strike the alarm mechanism, the alarm mechanism sounds, realizing a wire shortage alarm.

[0014] Furthermore, the alarm mechanism includes: a fixed cylinder, which is fixedly installed on the outer side of the support shaft, and the side of the fixed cylinder is "C"-shaped; a movable cantilever, which is movably installed on the outer side of the fixed cylinder, and the inner side of the movable cantilever is provided with a protrusion located in the "C"-shaped opening of the fixed cylinder; and a bell head, which is fixedly installed on the outer side of the movable cantilever.

[0015] Furthermore, a permanent magnet is fixedly installed on the outer side of the pressure wheel, and a striking seat located above the bell head is fixedly installed on the outer side of the support shaft. When the wire breaks, the gear row pushed by the spring causes the gear to drive the wire disc to rotate. The pressure wheel, which is in contact with the outer side of the wire disc, drives the permanent magnet to rotate. When the permanent magnet passes the bell head, it uses magnetic force to attract the bell head, causing the bell head to follow the permanent magnet to rotate and strike the striking seat, thus realizing the wire breakage alarm.

[0016] A method of using an electrical discharge machining wire feeding device includes the following steps:

[0017] S1. The screw spool is installed onto the stepped shaft of the gear and secured with a nut.

[0018] S2. After the end of the electrode wire on the wire spool passes through the guide wheel, it is fastened to the outside of the wire storage cylinder with bolts.

[0019] S3. The control system synchronizes the motor and the reciprocating mechanism. The motor drives the wire storage drum to rotate, and the electrode wire is released from the wire spool through winding. The wire spool rotates and drives the gear to rotate synchronously. The gear row that meshes with the gear drives the guide slide to move vertically along the side of the wire feeding bracket and compresses the spring to store force.

[0020] S4. As the gear rack moves downward, the outer teeth of the gear contact / disengage with the top side teeth of the gear rack, and the spring compression creates resistance when the wire spool feeds the wire.

[0021] S5. When the electrode wire is loose, the spring force pushes the guide slide upward, the toothed rack and gear mesh again, and drives the wire spool to rotate, winding the electrode wire to make it tight again.

[0022] S6. The reciprocating mechanism drives the wire storage drum to move horizontally, and in conjunction with the winding, the electrode wire is wound around the outside of the wire storage drum.

[0023] The beneficial effects of this invention are as follows:

[0024] This invention provides an electrical discharge machining (EDM) wire feeding device and its usage method. A wire spool and a gear are coaxially fixed. When the wire spool feeds wire, it synchronously drives the gear to rotate. Simultaneously, the device includes a gear rack that meshes with the gear. When the wire spool drives the gear to rotate, the movement of the gear rack compresses and stores force in a connected spring until the gear rotates to the end of the gear rack. During normal wire feeding, the spring remains compressed and stores force. The stored spring force is transmitted through the gear rack and gears and acts in the opposite direction on the wire spool, providing resistance to wire feeding and ensuring the electrode wire remains taut throughout the feeding process.

[0025] When the fed electrode wire becomes loose, the spring force will force the toothed rack and gear to re-mesh. The gear will drive the wire spool to rotate in the opposite direction under the action of the toothed rack. The reverse rotation of the wire spool can quickly tighten the loose electrode wire again and correct the problem of electrode wire loosening during the wire feeding process.

[0026] In summary, the wire feeding device and its usage method for electrical discharge machining provided by this invention achieve the dual effects of resistance wire feeding and reverse wire tightening through the synergistic action between the wire spool, gears, gear rack and spring, thus providing a solution for the application of electrical discharge wire feeding technology in intelligent manufacturing equipment. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort:

[0028] Figure 1 This is a schematic diagram of the overall external three-dimensional structure of the present invention;

[0029] Figure 2 This is a schematic diagram of the side planar structure of the wire feeding process of the present invention;

[0030] Figure 3 This is a schematic diagram showing the installation positions and three-dimensional structure of each component on the wire feeding bracket of the present invention;

[0031] Figure 4 This is a schematic diagram of the installation position and three-dimensional structure between the gear and the gear rack of the present invention;

[0032] Figure 5 This is a schematic diagram of the three-dimensional structure of the silk disc of the present invention;

[0033] Figure 6 This is a schematic diagram showing the installation positions and three-dimensional structure of each component on the wire pressing slide of the present invention;

[0034] Figure 7 This is a schematic diagram showing the installation location and three-dimensional structure of the alarm mechanism of the present invention;

[0035] Figure 8 This is a schematic diagram of the exploded structure of the alarm mechanism of the present invention;

[0036] Figure 9 This is a schematic diagram of the normal wire feeding state of the present invention;

[0037] Figure 10 This is a schematic diagram showing the state after a wire breaks during the wire feeding process of this invention.

[0038] In the diagram: 1. Machine body; 2. Reciprocating mechanism; 3. Wire storage drum; 301. Motor; 4. Wire feeding bracket; 5. Wire spool; 501. Electrode wire; 502. Prediction protrusion; 6. Guide wheel; 7. Wire pressing wheel; 701. Permanent magnet; 8. Guide slide; 9. Wire pressing slide; 10. Support shaft; 11. Gear rack; 111. Limiting protrusion; 12. Pressure plate; 120. Spring; 13. Alarm mechanism; 130. Fixed cylinder; 131. Movable cantilever; 132. Bell head; 14. Bell striking base; 15. Gear; 16. Limiting post. Detailed Implementation

[0039] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0040] In Example 1, when cutting metal using wire electrical discharge machining (EDM), the electrode wire 501 on the wire spool 5 needs to be fed onto the wire storage drum 3 using a wire feeding mechanism. During this process, it is necessary to ensure that the electrode wire 501 remains relatively taut at all times. This prevents wire overlap or loosening when the wire storage drum 3 winds and winds the electrode wire 501. To achieve this goal in Example 1, please refer to... Figures 1-3 As can be seen, a reciprocating mechanism 2 is movably mounted on one side of the machine body 1. A wire storage drum 3 is movably mounted on the surface of the reciprocating mechanism 2. The wire storage drum 3 is mainly used for winding and coiling the electrode wire 501. A motor 301 is bolted to the end of the reciprocating mechanism 2. The output shaft of the motor 301 is coaxially and fastened to the wire storage drum 3. The control system regulates the motor 301 to make the wire storage drum 3 rotate, thereby completing the winding and coiling of the electrode wire 501. Figure 1As can be seen, the right side of the rotating shaft of the wire storage drum 3 extends outward, which can cooperate with the crank handle. The operator can manually rotate the wire storage drum 3 using the crank handle to manually wind the wire. In addition, the reciprocating mechanism 2 generally uses a lead screw and a servo motor for movement, so that the reciprocating mechanism 2 can drive the wire storage drum 3 and the motor 301 to move back and forth along the central axis of the wire storage drum 3. In this way, when the motor 301 drives the wire storage drum 3 to rotate and wind the electrode wire 501, the horizontal movement of the reciprocating mechanism 2 makes the electrode wire 501 evenly distributed in the axial direction of the wire storage drum 3.

[0041] Furthermore, the machine body 1 has a wire feeding bracket 4 bolted to the middle, and a gear 15 is movably mounted on the surface of the wire feeding bracket 4. The gear 15 can only rotate on the surface of the wire feeding bracket 4. The shaft of the gear 15 is preferably a stepped shaft. Correspondingly, the wire spool 5 can be fitted onto the shaft of the gear 15, and a nut is used to secure the wire spool 5 to the shaft of the gear 15, so that the rotation of the wire spool 5 synchronously drives the rotation of the gear 15. An electrode wire 501 is wound on the outer side of the wire spool 5. When using wire EDM for metal cutting, the electrode wire 501 on the wire spool 5 needs to be fed into the wire storage drum 3 first. During this process, according to... Figure 1 and Figure 2 It can be seen that a guide wheel 6 is fixedly installed on the machine body 1. The guide wheel 6 guides the electrode wire 501, so that the electrode wire 501 on the wire spool 5 can be input to the outside of the wire storage drum 3.

[0042] The wire feeding bracket 4 has a guide slide 8 on its side, which is guided by a dovetail groove. The guide slide 8 is restricted by the dovetail groove and can only move vertically up and down along the side of the wire feeding bracket 4. For example... Figure 4 As shown, the guide slide 8 has a gear rack 11 bolted to its side, and the gear rack 11 meshes with the gear 15. When the gear 15 rotates forward and backward, it can drive the gear rack 11 to move up and down accordingly. Furthermore, from... Figure 3 and Figure 4 It can be seen that a pressure plate 12 is symmetrically and movably mounted on the top of the guide slide 8, and the pressure plate 12 is T-shaped. A spring 120 is provided between the pressure plate 12 and the guide slide 8. In this embodiment, as... Figure 3 As shown, without the pressure plate 9 installed, the pressure plate 12 pushes downward and presses against the top of the wire feeding bracket 4 under the force of the spring 120. In this way, under normal conditions, the bottom of the pressure plate 12 abuts against the top of the wire feeding bracket 4 under the force of the spring 120, and the top of the spring 120 pushes the guide slide 8 to move upward. When the guide slide 8 drives the gear rack 11 upward, the gear rack 11 moves upward synchronously until the spring 120 is in a freely extended state. At this time, the gear 15 and the gear rack 11 are in a meshing transmission state.

[0043] In the process of using this embodiment one, the method is as follows:

[0044] Normal reset action: In normal state, spring 120 is in a free extension state, guide slide 8 is pushed upward by the elastic force of spring 120, gear 15 is relatively close to the bottom of gear row 11, and gear 15 and gear row 11 are in external tooth meshing state.

[0045] Installation process of the screw spool 5: Install the required screw spool 5 onto the stepped shaft of the gear 15, and use nuts to fix the screw spool 5 to ensure that the screw spool 5 and the gear 15 are coaxially and securely installed.

[0046] The feeding and tightening process of electrode wire 501: After the end of electrode wire 501 on wire spool 5 passes through guide wheel 6, the end of electrode wire 501 is fastened to the outer side of wire storage drum 3 by bolts. Then, the control system synchronizes the operation of motor 301 and reciprocating mechanism 2. As motor 301 drives wire storage drum 3 to rotate, wire storage drum 3 releases electrode wire 501 from wire spool 5 through winding, causing wire spool 5 to rotate counterclockwise. Figure 9 As shown in the diagram, the wire spool 5 rotates counterclockwise, forcing the gear 15 to rotate synchronously. The meshing between the rotating gear 15 and the gear rack 11 forces the gear rack 11 to drive the guide slide 8 to move vertically downwards along the side of the wire feeding bracket 4. During the downward movement of the guide slide 8, the spring 120 is simultaneously compressed and stored. In this way, when the wire spool 5 releases the electrode wire 501, it needs to overcome the elastic force limitation of the compressed spring 120, ensuring that the wire spool 5 has a certain rotational resistance when feeding the wire.

[0047] As the gear rack 11 descends, the external teeth on the gear 15 eventually reach the top of the side teeth of the gear rack 11. As the wire spool 5 continuously feeds the wire, the gear 15 rotates continuously, causing the external teeth of the gear 15 to contact and disengage from the top of the side teeth of the gear rack 11. At this time, the spring 120 bears the maximum compression, which determines the resistance of the wire spool 5 when feeding the wire.

[0048] When the electrode wire 501 is released too much from the wire spool 5, causing the electrode wire 501 to become loose, the guide slide 8, pushed by the spring force of the spring 120, tends to move upward. During the upward movement of the gear rack 11, the gear rack 11 and the gear 15 are forced to mesh again, and the gear 15 is forced to drive the wire spool 5 to rotate in the opposite direction, that is, the wire spool 5 rotates clockwise, in the direction of... Figure 3 As shown. In this way, the gear 15 is driven to rotate in the opposite direction by the gear row 11, which forces the wire spool 5 to rotate in the opposite direction when the electrode wire 501 is loose. By winding the electrode wire 501, the electrode wire 501 is brought back into a tensioned state, avoiding the problem of wire stacking or loosening during the winding process of the wire storage spool 3 due to the electrode wire 501 being too loose.

[0049] Finally, as the reciprocating mechanism 2 drives the wire storage drum 3 to move horizontally, and in conjunction with the winding of the wire storage drum 3, the electrode wire 501 is eventually evenly wound around the outer side of the wire storage drum 3.

[0050] Based on this, since the installation of the wire spool 5 on the stepped shaft of the gear 15 has a dual nature, this will cause the rotation direction of the electrode wire 501 driven by the wire spool 5 to vary depending on the installation direction of the wire spool 5. According to the above, it can be seen that only when the wire spool 5 is rotating counterclockwise during wire feeding can the aforementioned resistance feeding and reverse tightening techniques be achieved. Therefore, as a supplement to Embodiment 1, combined with... Figure 4 As can be seen, the bottom end of the toothed rack 11 is fixedly connected to a limiting protrusion 111 that is away from the side teeth. Correspondingly, the side of the wire feeding bracket 4 has a limiting post 16 that is bolted on. When the wire spool 5 is installed normally, the wire feeding operation is performed normally according to the above-mentioned working procedure; conversely, if the wire spool 5 is installed in the reverse direction, when the operator pulls the end of the electrode wire 501, it will cause the wire spool 5 to drive the gear 15 to rotate counterclockwise, with the direction referenced. Figure 4 As shown. When gear 15 rotates, the gear rack 11 drives the limiting protrusion 111 to move upward until the limiting protrusion 111 abuts against the limiting post 16, thereby limiting the gear rack 11 from moving further upward and simultaneously limiting the rotation of gear 15. As a result, the wire spool 5 will also be unable to continue rotating, and the electrode wire 501 will not be able to continue to be released normally. The inability of the electrode wire 501 to continue to be released serves as a warning to the operator that the wire spool 5 is installed incorrectly and needs to be readjusted.

[0051] Example 2 is a further improvement on Example 1. Please refer to Example 1. Figure 3 and Figure 6 As can be seen, unlike Embodiment 1, Embodiment 2 features a wire pressing slide 9 movably mounted on the side of the guide slide 8, with the wire pressing slide 9 located below the pressure plate 12. This causes the pressure plate 12 to be pushed by the spring force of the spring 120, forcing the wire pressing slide 9 to maintain a downward trend. Furthermore, a support shaft 10 is securely mounted on the surface of the wire pressing slide 9, and a wire pressing wheel 7 is movably mounted on the outer side of the support shaft 10, positioned above the wire spool 5. Figure 3 , Figure 5 and Figure 6It can be clearly seen that the shape of the side of the wire reel 5 is "I"-shaped, and its outer side is mainly used for winding and reeling the electrode wire 501. The shape of the wire pressing wheel 7 is cylindrical, and the wire pressing wheel 7 is located above the wire reel 5, and their central axes are relatively parallel. In this way, when the wire reel 5 is installed, the electrode wire 501 on the outer side of the wire reel 5 is pressed by the wire pressing wheel 7, so that the electrode wire 501 will not become loose. Especially when the electrode wire 501 breaks, through the pressing of the electrode wire 501 by the wire pressing wheel 7, it is ensured that the electrode wire 501 on the outer side of the wire reel 5 will not become loose due to accidental wire breakage. Therefore, when the wire pressing wheel 7 presses on the outer side of the wire reel 5, it can ensure that after accidental wire breakage of the electrode wire 501, the electrode wire 501 wound on the side of the wire reel 5 is pressed by the wire pressing wheel 7 and will not become overly loose.

[0052] Embodiment 3 is a further improvement based on Embodiment 2. Since the electrode wire 501 outside the wire reel 5 continuously decreases after continuous wire feeding of the wire reel 5, after the electrode wire 501 decreases to a certain extent, it is necessary to remind the operator that the wire reel 5 is about to be used up and will soon enter the replacement stage. Moreover, during the wire feeding process of the wire reel 5, problems such as wire breakage may also occur. In order to ensure that these problems can be timely fed back to the operator. Combining Figure 3 、 Figures 5-8 As shown, an arc-shaped prediction protrusion 502 is fixedly connected to the outer side of the wire reel 5. Correspondingly, an alarm mechanism 13 is installed on the outer side of the support shaft rod 10. When the electrode wire 501 on the outer side of the wire reel 5 relatively decreases due to release, the wire pressing wheel 7 will further approach the wire reel 5, forcing the distance between the alarm mechanism 13 and the outer side of the wire reel 5 to shorten. When the prediction protrusion 502 hits the alarm mechanism 13, the alarm mechanism 13 makes a sound, warning the operator that the electrode wire 501 on the outer side of the wire reel 5 is relatively less and will soon enter the state that needs to be replaced.

[0053] The alarm mechanism 13 mainly includes a fixed cylinder 130, a movable cantilever 131 and a bell head 132. Among them, the fixed cylinder 130 is fixedly installed on the outer side of the support shaft rod 10. The side of the fixed cylinder 130 is "C"-shaped. Correspondingly, a movable cantilever 131 is movably installed on the outer side of the fixed cylinder 130, and the movable cantilever 131 can only deflect within the "C"-shaped opening of the fixed cylinder 130 through the protrusion protruding from the inner side. Moreover, a bell head 132 is firmly installed on the outer side of the movable cantilever 131. Under normal conditions, the bell head 132 is in a vertically arranged state, and the bell head 132 is located directly above the outer side of the wire reel 5. By changing the installation position of the bell head 132 on the outer side of the movable cantilever 131, the distance between the bell head 132 and the outer side of the wire reel 5 is adjusted.

[0054] Meanwhile, a permanent magnet 701 is fixedly installed on the outer side of the pressing wheel 7. When the pressing wheel 7 rotates, it can drive the permanent magnet 701 to rotate. When the permanent magnet 701 passes the bell head 132, based on the magnetic attraction of the permanent magnet 701 to the bell head 132, the permanent magnet 701 is forced to tend to drive the bell head 132 to move. Furthermore, combined with... Figure 3 and Figure 6 It can be seen that a bell-ringing seat 14 is fixedly installed on the outer side of the support shaft 10, located above the bell head 132. When the bell-ringing seat 14 and the bell head 132 collide, the bell head 132 can make a sound to warn.

[0055] More specifically, the main working principle of this third embodiment is as follows:

[0056] Under normal conditions, the bell head 132 is in a vertically downward position under the influence of gravity. At this time, the bell head 132 is located directly above the outer side of the silk reel 5, and the inner protrusion of the movable cantilever 131 abuts against one end of the opening of the fixed cylinder 130, as shown. Figure 7 and Figure 3 The state shown.

[0057] An alarm is triggered when the outer electrode wire 501 of the wire reel 5 is low: As the wire storage drum 3 rotates and winds the electrode wire 501, the electrode wire 501 will rotate counterclockwise via the traction reel 5. Figure 9 As shown in the diagram. During this process, because the pressure roller 7 is pressed tightly against the outer side of the wire spool 5, the wire spool 5 will cause the pressure roller 7 to move clockwise. As the pressure roller 7 drives the permanent magnet 701 to move clockwise, when the permanent magnet 701 passes the bell head 132, the magnetic attraction of the permanent magnet 701 on the bell head 132 causes the bell head 132 to also tend to move clockwise. Since the protrusion on the inner side of the movable cantilever 131 abuts against the opening end of the fixed cylinder 130 at this time, the movable cantilever 131 and the bell head 132 cannot rotate clockwise. In this way, the magnetic traction of the permanent magnet 701 on the bell head 132 and the gravity of the bell head 132 force the bell head 132 to always be vertically arranged, and the bell head 132 is located directly above the outer side of the wire spool 5.

[0058] Initially, because there are relatively more electrode wires 501 on the outer side of the spool 5, the pre-announcing protrusion 502 and the bell head 132 will not contact each other when the pressure roller 7 presses against the outer side of the spool 5. As the electrode wires 501 are continuously released, the thickness of the electrode wires 501 on the outer side of the spool 5 will continuously decrease. The spring force of the spring 120 on the pressure roller 9 forces the pressure roller 7 to press tightly against the outer side of the spool 5. Therefore, as the number of electrode wires 501 on the outer side of the spool 5 decreases, the pressure roller 7 drives the support shaft 10 and the pressure roller 9 to move down along the guide roller 8, forcing the bell head 132 to move down and approach the outer side of the spool 5. As the electrode wires 501 are continuously released outward, the spool 5 drives the pre-announcing protrusion 502 to rotate continuously. When the pre-announcing protrusion 502 moves to the bell head 132, the two come into contact, and the pre-announcing protrusion 502 strikes the bell head 132, forcing the bell head 132 to make a sound. More specifically, during the process of the forecast protrusion 502 striking the bell head 132, since both the forecast protrusion 502 and the outer side of the bell head 132 are curved, the bell head 132 tends to push the support shaft 10 upwards, thus ensuring that the forecast protrusion 502 can pass smoothly under the bell head 132. As the wire spool 5 continuously drives the forecast protrusion 502 to rotate, the forecast protrusion 502 will also continuously strike the bell head 132, thus alerting the operator that the electrode wire 501 on the outer side of the wire spool 5 is about to be fully released.

[0059] Afterwards, the operator manually feeds the wire into the wire storage drum 3 by cranking the handle and observes the electrode wire 501 on the wire spool 5. By manually feeding the wire, the electrode wire 501 on the wire spool 5 can be fully released for use.

[0060] Electrode wire 501 breakage alarm process: If the electrode wire 501 breaks unexpectedly during the wire feeding process of the wire spool 5, the broken electrode wire 501 will be unable to maintain the wire spool 5 against the elastic force of the spring 120. Then, under the push of the spring 120, the guide slide 8 drives the gear rack 11 upward, and the meshing between the gear rack 11 and the gear 15 forces the wire spool 5 to rotate clockwise. Figure 10 The state shown.

[0061] Since the pressure roller 7 always presses against the outer side of the wire spool 5, when the electrode wire 501 breaks, it is pressed by the pressure roller 7, thus preventing the electrode wire 501 on the wire spool 5 from becoming excessively loose, as described in Embodiment 2. Furthermore, when the wire spool 5 rotates clockwise, it drives the pressure roller 7 to rotate counterclockwise simultaneously. When the pressure roller 7 drives the permanent magnet 701 to rotate counterclockwise and passes the bell head 132, the permanent magnet 701 attracts the bell head 132, causing it to follow the pressure roller 7. When the permanent magnet 701 drives the bell head 132 past the striking base 14, the impact between the bell head 132 and the striking base 14 causes the bell head 132 to ring. Simultaneously, the striking base 14 prevents the bell head 132 from continuing to move; therefore, the continuously rotating pressure roller 7 causes the permanent magnet 701 to separate from the bell head 132. After the bell head 132 strikes the bell holder 14 and detaches from the permanent magnet 701, it will return to a vertically downward position under the influence of gravity. In this way, when the pressure wheel 7 drives the permanent magnet 701 to rotate again, the permanent magnet 701 will attract the bell head 132 to strike the bell holder 14 again. This process is repeated, ensuring that as the spring 120 pushes the toothed rack 11 upward, the bell head 132 will continuously strike the bell holder 14, thus producing a continuous sound to warn the operator of a broken wire malfunction.

[0062] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A wire feeding device for electrical discharge machining, characterized in that, include: The machine body (1) has a reciprocating mechanism (2) mounted on its surface, and a wire storage drum (3) driven by a motor (301) is movably mounted on the surface of the reciprocating mechanism (2). The wire feeding bracket (4) is fixed in the middle of the machine body (1), and a gear (15) is movably installed on the surface of the wire feeding bracket (4). A wire spool (5) is fixedly installed on the shaft of the gear (15), and an electrode wire (501) is wound on the outer side of the wire spool (5). The guide wheel (6) is fixed on the machine body (1). After the electrode wire (501) on the wire spool (5) is reversed by the guide wheel (6), the end of the electrode wire (501) is fixed on the wire storage drum (3). The guide slide (8) is installed on the side of the wire feeding bracket (4), and the guide slide (8) is equipped with a gear row (11) that meshes with the external teeth of the gear (15). The top of the guide slide (8) is movably equipped with a pressure plate (12), and a spring (120) is provided between the pressure plate (12) and the guide slide (8). A limiting mechanism is provided at the bottom of the pressure plate (12) to support the bottom of the pressure plate (12). When the electrode wire (501) is fed, the electrode wire (501) pulls the wire spool (5) and drives the gear (15) to rotate. The gear (15) and the toothed rack (11) mesh and drive the transmission. The moving toothed rack (11) compresses and stores the spring (120) through the guide slide (8) until the top of the toothed rack (11) moves to the side of the gear (15). The compressed spring (120) uses the meshing between the toothed rack (11) and the gear (15) to realize the motion resistance when the wire spool (5) is fed, thus completing the resistance wire feeding. When the electrode wire (501) is loosened, the toothed rack (11) pushed by the spring force of the spring (120) causes the gear (15) to drive the wire disc (5) to rotate in the opposite direction, thereby realizing the wire disc (5) to reverse and tighten the wire.

2. The wire feeding device for electrical discharge machining according to claim 1, characterized in that, The shaft of gear (15) is a stepped shaft.

3. The wire feeding device for electrical discharge machining according to claim 1, characterized in that, The bottom end of the toothed rack (11) is fixedly connected to the limiting protrusion (111), and the side of the wire feeding bracket (4) is fastened with the limiting post (16). When the wire spool (5) is installed incorrectly, the wire spool (5) rotates to feed wire, and the gear (15) causes the toothed rack (11) to drive the limiting protrusion (111) to abut against the limiting post (16), thereby limiting the rotation of the wire spool (5).

4. The wire feeding device for electrical discharge machining according to claim 1, characterized in that, The first type of limiting mechanism includes: the pressure plate (12) is pushed downward by the elastic force of the spring (120) so that the bottom end of the pressure plate (12) abuts against the top of the wire feeding bracket (4).

5. The wire feeding device for electrical discharge machining according to claim 1, characterized in that, The second type of limiting mechanism includes: The pressing slide (9) is movably installed on the side of the guide slide (8), and the pressing slide (9) is located below the pressing plate (12); The support shaft (10) is fixed on the surface of the pressing slide (9), and the pressing wheel (7) located above the wire spool (5) is movably installed on the outer side of the support shaft (10).

6. The wire feeding device for electrical discharge machining according to claim 5, characterized in that, The outer side of the spool (5) is fixedly connected to a warning protrusion (502), and the outer side of the support shaft (10) is equipped with an alarm mechanism (13).

7. The wire feeding device for electrical discharge machining according to claim 6, characterized in that, After the electrode wire (501) on the outer side of the wire spool (5) is reduced, the wire pressing wheel (7) moves closer to the wire spool (5), so that the alarm mechanism (13) and the outer side of the wire spool (5) are close together. When the wire spool (5) drives the warning bump (502) to hit the alarm mechanism (13), the alarm mechanism (13) makes a sound, realizing the wire shortage alarm.

8. The wire feeding device for electrical discharge machining according to claim 6, characterized in that, Alarm mechanisms (13) include: The fixing cylinder (130) is fixedly installed on the outer side of the support shaft (10), and the side of the fixing cylinder (130) is "C" shaped; The movable cantilever (131) is movably installed on the outside of the fixed cylinder (130), and the inner side of the movable cantilever (131) is provided with a protrusion located in the "C"-shaped opening of the fixed cylinder (130); The bell head (132) is fixedly installed on the outside of the movable cantilever (131).

9. The wire feeding device for electrical discharge machining according to claim 8, characterized in that, A permanent magnet (701) is fixedly installed on the outer side of the pressing wheel (7), and a bell-ringing seat (14) located above the bell head (132) is fixedly installed on the outer side of the support shaft (10). When the wire breaks, the gear rack (11) pushed by the spring (120) causes the gear (15) to drive the wire disc (5) to rotate. The pressure wheel (7) that is in contact with the outside of the wire disc (5) drives the permanent magnet (701) to rotate. When the permanent magnet (701) passes the bell head (132), it uses magnetic force to attract the bell head (132), causing the bell head (132) to follow the permanent magnet (701) to rotate and hit the bell holder (14), thus realizing the wire break alarm.

10. A method of using an electrical discharge machining (EDM) wire feeding device, comprising using the EDM wire feeding device as described in claim 2, characterized in that, Includes the following steps: S1. The screw (5) is installed on the stepped shaft of the gear (15) and fixed with a nut; S2. The end of the electrode wire (501) on the wire spool (5) passes through the guide wheel (6) and is then fastened to the outside of the wire storage cylinder (3) with bolts. S3. The control system makes the motor (301) and the reciprocating mechanism (2) work synchronously. The motor (301) drives the wire storage drum (3) to rotate. The electrode wire (501) is released from the wire spool (5) by winding. The wire spool (5) rotates and drives the gear (15) to rotate synchronously. The tooth row (11) meshing with the gear (15) drives the guide slide (8) to move vertically along the side of the wire feeding bracket (4) and compresses the spring (120) to store force. S4. As the gear rack (11) moves downward, the outer teeth of the gear (15) contact / disengage with the top side teeth of the gear rack (11), and the spring (120) is compressed to provide resistance when the wire spool (5) feeds the wire. S5. When the electrode wire (501) is loosened, the spring (120) pushes the guide slide (8) upward, the tooth row (11) and the gear (15) mesh again, and drive the wire spool (5) to rotate, winding up the electrode wire (501) to make it tight again. S6. The reciprocating mechanism (2) drives the wire storage drum (3) to move horizontally and cooperates with the winding to make the electrode wire (501) wrapped around the outside of the wire storage drum (3).

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