Wire cutting machine tool guide wheel power supply device

Abstract

The utility model relates to a power supply device for a guide wheel of a linear cutting machine, which comprises a shell, a copper column, a current transformer and the like. A waterproof structure is formed by a sealing gasket and a waterproof pad between the shell and the insulating sleeve, and dustproof and waterproof purposes are achieved through a dustproof ring and a sealing piece of the connecting part; the current transformer monitors on-off of a power supply loop in real time. The indicating lamp is used for power-off alarm. The carbon brush is matched with the hard alloy sheet for conduction. The device effectively solves the problems that an existing power supply device is insufficient in waterproof and dustproof performance, has no alarm for carbon brush abrasion and the like, guarantees stable current transmission, has the advantages of being stable in structure, modularized, easy to maintain and the like, can reduce equipment fault risks and maintenance cost, and improves the machining precision and production efficiency of a linear cutting machine tool.

Description

Technical Field

[0001] This utility model relates to the field of wire electrical discharge machining (EDM) technology, specifically to a power supply device for the guide wheel of a wire EDM machine. Background Technology

[0002] The currently known guide wheel power supply device mainly consists of a copper sleeve, guide post, carbon brush, insulating sleeve, conductive alloy, and composite nut. Its working principle is as follows: high-frequency current is supplied through the copper sleeve to provide the necessary electrical energy for machine tool cutting. In terms of specific structural connections, a metal guide post containing a carbon brush is embedded inside the copper sleeve. This metal guide post is installed in the insulating sleeve, and this entire assembly is then installed through the insulating sleeve onto the external threaded hole of the guide wheel assembly. Inside the guide wheel assembly, on the guide wheel shaft, a composite nut with an embedded carbide plate is installed. Under the compression of the spring on the carbon brush, the carbide plate makes close contact with the carbon tip of the carbon brush. During operation, the composite nut with the embedded carbide plate rotates with the guide wheel shaft, maintaining frictional contact between the carbon brush and the carbide plate. High-frequency electricity is then transmitted from the copper sleeve through the carbon brush and carbide plate to the guide wheel, thereby powering the molybdenum wire on the guide wheel.

[0003] However, this structure has significant drawbacks. First, the carbon brushes and carbide plates make contact through friction. During operation, the wear dust generated by the carbon brushes can easily penetrate the bearings of the guide wheel assembly, causing bearing damage and reducing cutting accuracy. Simultaneously, liquids in the wire EDM environment may seep into the power supply unit through the connection between the insulating sleeve and the guide wheel assembly, and between the insulating sleeve and the contact copper sleeve, soaking and damaging the carbon brushes and shortening their lifespan. Furthermore, liquids may also enter the guide wheel assembly through the power supply device, damaging the bearings and further affecting machining accuracy. Second, the carbon brushes inevitably wear down due to continuous friction with the carbide plates during use. When the wear reaches a certain level, the current cannot be guaranteed to be stable. If not replaced in time, this can lead to breakage of the machining electrode wire, affecting the machining progress. The current structure cannot effectively monitor the carbon brush's condition and lacks a necessary alert function when the carbon brushes are worn to the point of being unable to effectively conduct current. Summary of the Invention

[0004] (a) Technical problems to be solved

[0005] The technical problem to be solved by this utility model is the inadequacy of existing guide wheel power supply devices in terms of waterproofing and dustproofing, as well as the inability to provide effective alarms due to unstable power supply caused by carbon brush wear.

[0006] (II) Technical Solution

[0007] To solve the above problems, this utility model provides the following technical solution:

[0008] A power supply device for a guide wheel of a wire EDM machine includes a housing, a copper column, a copper screw, a current transformer, a carbon brush guide post, a carbon brush, an insulating sleeve, a sealing gasket, a waterproof gasket, a dustproof ring, a composite nut, and a carbide sheet. The copper column is disposed within the housing, and the copper screw is threadedly connected to the copper column. The current transformer is sleeved around the outer ring of the copper column and disposed inside the housing. One end of the carbon brush guide post is threadedly connected to the end of the copper column furthest from the copper screw, and the other end is connected to the insulating sleeve. The carbon brush is embedded in the carbon brush guide post. A sealing gasket is embedded in the end of the housing away from the copper screw. A waterproof gasket is embedded in the side of the insulating sleeve near the sealing gasket. The side of the insulating sleeve away from the housing has a connecting portion for easy connection with an external wire-cut guide wheel sleeve. The composite nut has a clamping claw on the side near the carbide plate. The carbide plate is fixedly mounted on the end of the composite nut near the carbon brush by the clamping claw, and the carbide plate and the end of the carbon brush near the composite nut are in frictional contact. The current transformer has an indicator light, which is electrically connected to the current transformer. The sealing plate is sleeved on the outer ring of the connecting portion to ensure the sealing of the connection between the connecting portion and the external guide wheel sleeve.

[0009] Furthermore, one side of the outer casing is provided with a circular hole for installing the copper pillar. The outer wall of the end of the copper pillar near the circular hole is connected to the inner wall of the circular hole by an interference fit. The end of the copper pillar near the copper screw is provided with a threaded hole, and the copper screw is connected to the threaded hole by a threaded connection. The other end of the copper pillar is provided with a threaded hole for easy connection with the carbon brush guide post. The end of the outer casing near the insulating sleeve is provided with a recessed groove, and the sealing gasket is embedded in the recessed groove.

[0010] Furthermore, the insulating sleeve has a recessed groove two on the side near the outer shell, the waterproof pad is embedded in the recessed groove two, the depth of the recessed groove two is less than the thickness of the waterproof pad, the copper pillar has a threaded hole two, and the end of the carbon brush guide post near the copper pillar is connected to the threaded hole two by a threaded connection.

[0011] Furthermore, the carbon brush extends into the connecting part at one end near the composite nut, and the outer ring of the connecting part is threaded to facilitate connection with the external guide wheel sleeve. The composite nut is provided with a threaded hole three for connection with the external guide wheel shaft.

[0012] Furthermore, the inner wall of the connecting part is provided with an annular groove, the annular dustproof ring is disposed in the annular groove, and a gap is left between the inner wall of the dustproof ring and the outer wall of the composite nut.

[0013] Furthermore, a potting area is provided between the inner wall of the housing and the current transformer, and the potting area is used to pot glue to fix the current transformer and the copper column.

[0014] Furthermore, the depth of the sink groove is greater than the thickness of the sealing gasket, and the insulating sleeve is provided with an annular protrusion on the side near the outer shell, the end face of the annular protrusion abutting against the sealing gasket.

[0015] Furthermore, the outer wall of the insulating sleeve is provided with a limiting hole one, the limiting hole one extends to the outer wall of the carbon brush guide post, and a limiting screw one is provided in the limiting hole; the outer shell is provided with a limiting hole two, the limiting hole two extends to the outer wall of the copper post, and a limiting screw two is provided in the limiting hole two.

[0016] Furthermore, the carbon brush guide post is provided with a rectangular through hole, the carbon brush is sleeved in the rectangular through hole, and the end of the carbon brush near the outer shell abuts against the bottom end face of the second threaded hole.

[0017] Furthermore, the copper screw is provided with a washer to facilitate the locking of the external conductive wire to the copper pillar. The outer end of the indicator light is provided with a lampshade. The outer shell is provided with a round hole to facilitate the installation and exposure of the indicator light. The sealing element is any one of a rubber O-ring and a rubber annular sealing gasket.

[0018] (III) Beneficial Effects

[0019] The beneficial effects of this utility model are:

[0020] 1. Highly efficient waterproof and dustproof: Through multiple protections of sealing gaskets, waterproof gaskets, and dustproof rings, as well as structural designs such as sinking grooves and annular protrusions, a comprehensive waterproof and dustproof system is formed, effectively preventing water vapor, dust, and other impurities from entering the device. This greatly reduces the risk of components being damaged due to moisture and dust accumulation, extends the service life of the device, reduces the number of maintenance times and maintenance costs, and at the same time reduces the probability of dust entering the guide wheel sleeve, thus improving the service life of the bearings on the guide wheel sleeve.

[0021] 2. Real-time Power Supply Status Monitoring and Alarm: The combination of current transformer and indicator light enables real-time monitoring of the power supply circuit and power outage alarm functions. When carbon brush wear causes a power outage, the current transformer can detect the power outage in a timely manner and emit a clear light signal by turning off the indicator light to remind the operator. This allows the operator to promptly identify and handle the problem, avoiding processing quality issues caused by power outages and ensuring the normal operation and processing quality of the wire EDM machine.

[0022] 3. Modular design facilitates installation and maintenance: This device adopts a modular design concept, with components assembled via threaded connections, resulting in a clear structure that facilitates installation and disassembly. During maintenance or component replacement, operators can quickly locate and replace damaged parts without the need for complex disassembly and reassembly of the entire device, significantly improving maintenance efficiency and reducing maintenance difficulty and time costs. Attached image description:

[0023] Figure 1 This is a cross-sectional view of the present invention;

[0024] Figure 2 This is a cross-sectional view of the insulating sleeve of this utility model;

[0025] Figure 3 This is a schematic diagram of the structure of the outer shell of this utility model;

[0026] Figure 4 This is a cross-sectional view of the copper column of this utility model;

[0027] Figure 5 This is a schematic diagram of the gripper structure of this utility model.

[0028] The markings in the diagram are: 1-Outer shell, 2-Copper pillar, 3-Copper screw, 4-Current transformer, 5-Carbon brush guide post, 6-Carbon brush, 7-Insulating sleeve, 8-Sealing gasket, 9-Waterproof gasket, 10-Dustproof ring, 11-Composite nut, 12-Hard alloy sheet, 13-Connecting part, 14-Claw, 15-Indicator light, 16-Round hole one, 17-Threaded hole one, 18-Threaded hole two, 19-Sunk groove one, 20-Sunk groove two, 21-Threaded hole three, 22-Annular groove, 23-Pouring area, 24-Annular protrusion, 25-Limiting hole one, 26-Limiting screw one, 27-Limiting hole two, 28-Limiting screw two, 29-Rectangular through hole, 30-Gasket, 31-Lamp cover, 32-Seal. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0030] In the description of this utility model, it should be understood that the terms "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0031] Please see Figures 1-5 The diagram illustrates a power supply device for a wire EDM machine guide wheel, comprising a housing 1, a copper column 2, copper screws 3, a current transformer 4, a carbon brush guide column 5, carbon brushes 6, an insulating sleeve 7, a sealing gasket 8, a waterproof gasket 9, a dustproof ring 10, a composite nut 11, a hard alloy sheet 12, and a seal 32. The copper column 2, as the main conductive component, is housed within the housing 1. A circular hole 16 is provided on one side of the housing 1 for mounting the copper column 2. The outer wall of the end of the copper column 2 near the circular hole 16 is connected to the inner wall of the circular hole 16 by an interference fit. This connection method ensures that the copper column 2 is securely fixed within the housing 1, preventing loosening due to vibration or other factors, thereby ensuring the stability of the conductive connection. The copper post 2 has a threaded hole 17 at one end near the copper screw 3. The copper screw 3 is connected to the threaded hole 17 by threads, and the copper screw 3 is equipped with a washer 30. The washer 30 increases the contact area and enhances the clamping force, making it easy to firmly lock the external conductive wire to the copper post 2 and achieve stable current input. The other end of the copper post 2 has a threaded hole 18, which is used to facilitate connection with the carbon brush guide post 5 and provide a path for current transmission.

[0032] The current transformer 4 is fitted around the outer ring of the copper column 2 and located inside the housing 1. A potting area 23 is provided between the inner wall of the housing 1 and the current transformer 4. By potting in the potting area 23, the current transformer 4 and the copper column 2 are firmly fixed together, further enhancing the connection stability and providing good insulation and protection, preventing external factors from interfering with the normal operation of the current transformer 4 and the copper column 2. An indicator light 15 is installed on the current transformer 4 and is electrically connected to it. The outer end of the indicator light 15 is equipped with a lampshade 31, and the housing 1 has a circular hole for easy installation and exposure of the indicator light 15. The current transformer 4 can monitor the on / off status of the power supply circuit in real time. When a power outage is detected, the indicator light 15 turns off to alert the operator of the power supply abnormality, facilitating timely inspection and maintenance.

[0033] One end of the carbon brush guide post 5 is connected to the end of the copper post 2 away from the copper screw 3 via a threaded connection, and the other end is connected to the insulating sleeve 7. The carbon brush guide post 5 has a rectangular through hole 29, in which the carbon brush 6 is embedded. The end of the carbon brush 6 near the outer casing 1 is tightly abutted against the bottom surface of the threaded hole 18. This design ensures good conductive contact between the carbon brush 6 and the copper post 2, ensuring smooth current transmission from the copper post 2 to the carbon brush 6. Simultaneously, the carbon brush guide post 5 guides and supports the carbon brush 6, limiting its movement and ensuring stable frictional contact between the carbon brush 6 and the hard alloy sheet 12.

[0034] The insulating sleeve 7 has a recessed groove 20 on the side near the outer shell 1. The waterproof gasket 9 is embedded in the recessed groove 20, and the depth of the recessed groove 20 is intentionally designed to be less than the thickness of the waterproof gasket 9. When the insulating sleeve 7 is assembled with the outer shell 1, the waterproof gasket 9 will be compressed and deformed, thereby forming a tight seal between the two, effectively preventing liquid intrusion. The insulating sleeve 7 and the carbon brush guide post 5 are bonded firmly to the end near the insulating sleeve 7 with anaerobic adhesive. A limiting hole 25 is provided on the outer wall of the insulating sleeve 7, which extends to the outer wall of the carbon brush guide post 5. A limiting screw 26 is installed in the limiting hole 25. By tightening the limiting screw 26, the connection between the carbon brush guide post 5 and the insulating sleeve 7 can be further fixed, preventing loosening due to vibration or other factors, and ensuring the stability of the structure.

[0035] The sealing gasket 8 is embedded at the end of the outer casing 1 away from the copper screw 3. The end of the outer casing 1 near the insulating sleeve 7 has a recessed groove 19, in which the sealing gasket 8 is embedded. The depth of the recessed groove 19 is greater than the thickness of the sealing gasket 8. When the insulating sleeve 7 is mated with the outer casing 1, the annular protrusion 24 on the side of the insulating sleeve 7 near the outer casing 1 abuts against the sealing gasket 8, further compressing the sealing gasket 8, enhancing the sealing effect, and forming an effective waterproof barrier.

[0036] The insulating sleeve 7 has a connecting part 13 on the side away from the outer shell 1 for connecting to the external wire cutting guide wheel sleeve. The outer ring of the connecting part 13 is threaded to facilitate threaded connection with the external guide wheel sleeve. An annular groove 22 is provided on the inner wall of the connecting part 13, and an annular dustproof ring 10 is installed in the annular groove 22. A certain gap is left between the inner wall of the dustproof ring 10 and the outer wall of the composite nut 11. The dustproof ring 10 blocks the dust generated by the friction between the carbon brush 6 and the hard alloy sheet 12 in the cavity of the insulating sleeve 7 on the side of the carbon brush 6, preventing dust from entering the external guide wheel sleeve assembly, protecting the bearing from dust damage, and thus ensuring that the machining accuracy is not affected. The sealing element 32 is sleeved on the outer ring of the connecting part 13. The sealing element 32 is either a rubber O-ring or a rubber annular sealing gasket, ensuring the sealing between the connecting part 13 and the external guide wheel sleeve after connection. When the insulating sleeve 7 is installed to the external guide wheel sleeve assembly, the sealing element 32 is squeezed to prevent liquid from entering the guide wheel sleeve assembly.

[0037] The composite nut 11 has a clamping claw 14 on the side near the carbide plate 12. The carbide plate 12 is fixedly mounted on the end of the composite nut 11 near the carbon brush 6 by the clamping claw 14, and the carbide plate 12 and the end of the carbon brush 6 near the composite nut 11 maintain frictional contact. The carbide plate 12 has good wear resistance and conductivity, and can make stable contact with the carbon brush 6, ensuring that the current is smoothly transmitted from the carbon brush 6 to the external guide wheel. The composite nut 11 has a threaded hole 21 for connecting to the external guide wheel shaft, and a stable connection with the external guide wheel shaft is achieved by threaded connection. At the same time, the outer shell 1 has a limiting hole 27, which extends to the outer wall of the copper column 2. A limiting screw 28 is installed in the limiting hole 27 to fix the connection between the copper column 2 and the outer shell 1, further enhancing the stability of the entire device structure.

[0038] Working principle:

[0039] I. Principle of Current Transmission:

[0040] The external conductive wire is connected to the copper pillar 2 via a copper screw 3. The copper screw 3 is tightly threaded into the threaded hole 17 of the copper pillar 2, and the washer 30 increases the contact area and enhances the clamping force, ensuring that the external conductive wire is firmly fixed to the copper pillar 2, thereby introducing external current into the device. The current is conducted through the copper pillar 2. Because the copper pillar 2 is made of high-purity copper, it has excellent conductivity and can stably and efficiently transmit current.

[0041] Current is transmitted from the copper post 2 to the carbon brush 6. The carbon brush 6 is embedded in the rectangular through hole 29 of the carbon brush guide post 5, and the end of the carbon brush 6 near the outer casing 1 is in close contact with the bottom end face of the threaded hole 18 of the copper post 2, forming good conductive contact. Under the guidance and support of the carbon brush guide post 5, the carbon brush 6 maintains a stable position, ensuring stable contact with the hard alloy sheet 12.

[0042] The current is transmitted from the carbon brush 6 to the cemented carbide sheet 12. The cemented carbide sheet 12 is fixed by the jaws 14 of the composite nut 11 and maintains frictional contact with the end of the carbon brush 6 near the composite nut 11. The cemented carbide sheet 12 has high hardness and good conductivity, and stably conducts the current during the friction with the carbon brush 6.

[0043] Finally, the current is transmitted to the guide wheel through the threaded hole 21 on the composite nut 11, providing stable power to the guide wheel of the wire EDM machine and ensuring the smooth operation of the machine tool.

[0044] II. Waterproof and dustproof principle:

[0045] In terms of waterproofing, the device constructs multiple waterproof barriers. A sealing gasket 8 is embedded in the recessed groove 19 near the insulating sleeve 7 of the outer shell 1. The annular protrusion 24 on the side of the insulating sleeve 7 near the outer shell 1 abuts against the sealing gasket 8. By compressing the sealing gasket 8, a first waterproof seal is formed between the outer shell 1 and the insulating sleeve 7. A waterproof gasket 9 is embedded in the second recessed groove 20 on the side of the insulating sleeve 7 near the outer shell 1. The depth of the second recessed groove 20 is less than the thickness of the waterproof gasket 9. When the insulating sleeve 7 and the outer shell 1 are assembled, the waterproof gasket 9 is compressed and deformed, filling the gap between them to form a second waterproof seal. Furthermore, a sealing element 32 is fitted around the outer ring of the connecting part 13. When the connecting part 13 is connected to the external guide wheel sleeve, it further fills the gaps, enhances the sealing of the connection, effectively prevents external liquids from entering the device, and protects the bearings from moisture damage.

[0046] For dust prevention, an annular dustproof ring 10 is installed in the annular groove 22 on the inner wall of the connecting part 13. A gap is left between the inner wall of the dustproof ring 10 and the outer wall of the composite nut 11, ensuring the normal rotation of the composite nut 11 while preventing external dust from entering the device. The dustproof ring 10 blocks the dust generated by the friction between the carbon brush 6 and the hard alloy sheet 12 within the cavity of the insulating sleeve 7 on the side of the carbon brush 6, preventing dust from entering the external guide wheel assembly, protecting the bearing from dust damage, and thus ensuring that machining accuracy is not affected.

[0047] III. Power Supply Status Monitoring Principle:

[0048] Current transformer 4 is mounted on the outer ring of copper column 2 to sense the on / off state of the current in copper column 2 in real time. When carbon brush 6 is working normally, the current can be transmitted smoothly through all components, the power supply circuit is unobstructed, current transformer 4 detects the current signal, and indicator light 15 remains lit, indicating that the device is powered normally. When the carbon brush 6 loses power due to wear or other reasons, current transformer 4 cannot detect the current signal, and indicator light 15 goes out, providing a visual alarm to the operator. By observing the status of indicator light 15, the operator can promptly detect power supply abnormalities, quickly determine the possible causes of the fault, and then inspect and maintain components such as carbon brush 6, avoiding the impact of power supply failure on the machining accuracy and production efficiency of the wire EDM machine.

[0049] The embodiments are detailed, and the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the present invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0050] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A power supply device for the guide wheel of a wire EDM machine, characterized in that: The device includes a housing (1), a copper pillar (2), a copper screw (3), a current transformer (4), a carbon brush guide post (5), a carbon brush (6), an insulating sleeve (7), a sealing gasket (8), a waterproof gasket (9), a dustproof ring (10), a composite nut (11), a hard alloy sheet (12), and a seal (32). The copper pillar (2) is disposed in the housing (1). The copper screw (3) is threadedly connected to the copper pillar (2). The current transformer (4) is fitted around the outer ring of the copper pillar (2) and disposed inside the housing (1). One end of the carbon brush guide post (5) is threadedly connected to the end of the copper pillar (2) away from the copper screw (3), and the other end is connected to the insulating sleeve (7). The carbon brush (6) is embedded in the carbon brush guide post (5). The sealing gasket (8) is embedded in the housing (1) away from the copper screw (3). At the end, the waterproof gasket (9) is embedded in the insulating sleeve (7) on the side near the sealing gasket (8). The insulating sleeve (7) on the side away from the outer shell (1) is provided with a connecting part (13) for easy connection with the external guide wheel sleeve. The composite nut (11) is provided with a clamp (14) on the side near the hard alloy plate (12). The hard alloy plate (12) is fixedly set at the end of the composite nut (11) near the carbon brush (6) by the clamp (14). The hard alloy plate (12) and the carbon brush (6) are in frictional contact at the end near the composite nut (11). The current transformer (4) is provided with an indicator light (15). The indicator light (15) is electrically connected to the current transformer (4). The sealing member (32) is sleeved on the outer ring of the connecting part (13) to ensure the sealing of the connection between the connecting part (13) and the external guide wheel sleeve.

2. The power supply device for the guide wheel of a wire EDM machine tool according to claim 1, characterized in that: The outer casing (1) has a circular hole (16) on one side for installing the copper pillar (2). The outer wall of the end of the copper pillar (2) near the circular hole (16) is connected to the inner wall of the circular hole (16) by an interference fit. The end of the copper pillar (2) near the copper screw (3) has a threaded hole (17). The copper screw (3) is connected to the threaded hole (17) by a threaded connection. The other end of the copper pillar (2) has a threaded hole (18) for easy connection with the carbon brush guide post (5). The outer casing (1) near the insulating sleeve (7) has a recessed groove (19). The sealing gasket (8) is embedded in the recessed groove (19).

3. The power supply device for the guide wheel of a wire EDM machine tool according to claim 2, characterized in that: The insulating sleeve (7) has a recessed groove (20) on the side near the outer shell (1), the waterproof pad (9) is embedded in the recessed groove (20), the depth of the recessed groove (20) is less than the thickness of the waterproof pad (9), the copper pillar (2) has a threaded hole (18), and the end of the carbon brush guide post (5) near the copper pillar (2) is connected to the threaded hole (18) by a threaded connection.

4. The power supply device for the guide wheel of a wire EDM machine tool according to claim 3, characterized in that: The carbon brush (6) extends into the connecting part (13) at one end near the composite nut (11). The outer ring of the connecting part (13) is threaded to facilitate connection with the external guide wheel sleeve. The composite nut (11) is provided with a threaded hole (21) for connection with the external guide wheel shaft.

5. The power supply device for the guide wheel of a wire EDM machine tool according to claim 4, characterized in that: The inner wall of the connecting part (13) is provided with an annular groove (22), and the annular dustproof ring (10) is disposed in the annular groove (22). A gap is left between the inner wall of the dustproof ring (10) and the outer wall of the composite nut (11).

6. The power supply device for the guide wheel of a wire EDM machine tool according to claim 1, characterized in that: A potting area (23) is provided between the inner wall of the outer casing (1) and the current transformer (4). The potting area (23) is used to pot glue to fix the current transformer (4) and the copper column (2).

7. The power supply device for the guide wheel of a wire EDM machine tool according to claim 2, characterized in that: The depth of the sink groove (19) is greater than the thickness of the sealing gasket (8). The insulating sleeve (7) is also provided with an annular protrusion (24) on the side near the outer shell (1). The end face of the annular protrusion (24) abuts against the sealing gasket (8).

8. The power supply device for the guide wheel of a wire EDM machine tool according to claim 1, characterized in that: The outer wall of the insulating sleeve (7) is provided with a limiting hole 1 (25), the limiting hole 1 (25) extends to the outer wall of the carbon brush guide post (5), and the limiting hole is provided with a limiting screw 1 (26). The outer shell (1) is provided with a limiting hole 2 (27), the limiting hole 2 (27) extends to the outer wall of the copper post (2), and the limiting hole 2 (27) is provided with a limiting screw 2 (28).

9. A power supply device for the guide wheel of a wire EDM machine tool according to claim 2, characterized in that: The carbon brush guide post (5) is provided with a rectangular through hole (29), the carbon brush (6) is embedded in the rectangular through hole (29), and the end of the carbon brush (6) near the outer shell (1) abuts against the bottom end face of the threaded hole (18).

10. The power supply device for the guide wheel of a wire EDM machine tool according to claim 1, characterized in that: The copper screw (3) is provided with a washer (30) to facilitate locking the external conductive wire to the copper pillar (2). The outer end of the indicator light (15) is provided with a lamp cover (31). The outer shell (1) is provided with a round hole to facilitate the installation and exposure of the indicator light (15). The sealing element (32) is either a rubber O-ring or a rubber annular sealing gasket.

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