A conductive device for electric spark wire cutting machine tool

Abstract

This invention relates to a conductive device for a wire EDM machine tool, comprising a rotating shaft, a guide ring, a bearing, a ring cover, a stationary shaft, a spring, an input rod, a receiving rod, and a wire. The bearing is installed in the inner hole of the rotating shaft, the guide ring is fitted onto the outside of the rotating shaft, and the ring cover is connected to one end of the rotating shaft. The front part of the stationary shaft is located in the inner hole of the bearing within the rotating shaft. The end of the stationary shaft protruding from the rotating shaft is the connection end for connecting to the wire EDM machine tool. A groove is provided inside the stationary shaft, and the input rod is positioned in the groove. The spring is located inside the groove of the stationary shaft and is pressed against by the end face of one end of the input rod. The outer side of the receiving rod is fixed to the middle of the ring cover, and the inner side of the receiving rod extends into the groove and contacts the input rod. The wire extends from the outside into the groove and connects to the input rod. This invention has a small overall size that does not affect the table travel, high coaxiality, and small radial runout, effectively reducing vibration of the electro-friction contact parts, reducing discharge loss caused by radial runout, and ensuring machining accuracy.

Description

Technical Field

[0001] The invention relates to the technical field of special machining electric spark wire cutting, in particular to a conductive device of an electric spark wire cutting machine tool. Background Art

[0002] The EDM wire cutting machine conducts electricity through the conductive block, and the molybdenum wire rubs against the conductive block. This causes the molybdenum wire to wear and a molybdenum wire groove to form on the conductive block. The molybdenum wire groove increases the resistance to wire transportation and often breaks the molybdenum wire, causing the molybdenum wire to be abnormally reported in advance. There are currently two main ways to solve the above problems. One is to conduct electricity through the wire drum, and the other is to conduct electricity through the front upper and lower guide wheels. However, both methods have obvious shortcomings: the wire drum conducts electricity far from the power amplifier, the molybdenum wire has a large resistance, and there is a problem of low conduction efficiency; conducting electricity through the front upper and lower guide wheels will affect the travel of the workbench, causing the guide wheels and bearings to wear out quickly. The loss of the guide wheels and bearings directly affects the quality, and there is a problem of reduced processing accuracy and quality.

[0003] For example, the Chinese patent with the announcement number CN104325203B describes a conductive device for the axis of the wire cutting guide wheel, but the conductive device also has the following shortcomings: 1. The conductive device is installed on the copper seat, and the protruding wire rack is easy to hit the workbench pillar, the maximum stroke is reduced, and the workbench stroke is shortened; 2. The conductive device is used on the front guide wheel of the upper and lower wire racks, which will cause the guide wheel to discharge, and the guide wheel loss is accelerated. The guide wheel loss directly affects the processing quality and there is a problem of reduced precision. For example, some workpieces need to be processed continuously for several days before they can be removed from the machine. The loss of the guide wheel discharge is obvious, which leads to the processing accuracy not meeting the requirements; 3. The spring pressure installed in the conductive device and the alloy dust dropped by the rotation friction will also cause the bearing to wear faster. The wear of the front guide wheel bearing will cause wire shaking, affecting the processing quality; 4. The alloy nut of the conductive device is installed on the guide wheel by the thread. There are problems such as large thread matching clearance causing large shaft concentricity error, poor shaft concentricity effect, easy loosening due to rotation vibration, and easy disconnection of the wire due to back and forth rotation and vibration. The above shortcomings limit the scope of use of the conductive device, and it cannot completely replace the traditional conductive block. Summary of the invention

[0004] The purpose of the present invention is to provide a conductive device for an electric spark wire cutting machine tool in view of the defects of the above-mentioned prior art. The conductive device has small dimensions and does not affect the worktable stroke, has high coaxiality and small radial run-out, can effectively reduce the vibration of electric friction contact parts, reduce the discharge loss caused by radial run-out, and ensure the processing accuracy.

[0005] The technical solution adopted by the present invention to achieve the above-mentioned purpose is: a conductive device for an electric spark wire cutting machine tool, including a rotating shaft, a guide ring, a bearing, a ring cover, a stationary shaft, a spring, a current feeding rod, a current receiving rod, and a wire. The rotating shaft is a cylindrical conductive body, the bearing is installed in the inner hole of the rotating shaft, the guide ring is an overall circular ring-shaped conductive body, the guide ring is sleeved outside the rotating shaft, the ring cover is a conductive body fixedly connected to one end of the rotating shaft, and the stationary shaft penetrates into the rotating shaft from the end of the rotating shaft away from the ring cover and passes through the inner hole of the bearing in the rotating shaft. The end of the stationary shaft protruding from the rotating shaft is the connecting end connected to the electric spark wire cutting machine. The end surface of the stationary shaft close to the ring cover is recessed inward and provided with a slide groove. The power feeding rod and the power receiving rod are conductors respectively. The power feeding rod is positioned in the slide groove of the stationary shaft. The spring is arranged on the inner side of the slide groove of the stationary shaft and is pressed by the end surface of one end of the power feeding rod. The outer side of the power receiving rod is fixed to the middle part of the ring cover. The inner side of the power receiving rod extends into the slide groove and contacts with the power feeding rod. The wire extends from the end of the stationary shaft away from the ring cover into the slide groove and is connected to the power feeding rod.

[0006] A further technical solution of the present invention is: the guide ring is sleeved outside the rotating shaft through a positioning ring, the positioning ring is a conductor, the guide ring is first sleeved outside the positioning ring, and the positioning ring is then fixedly sleeved outside the rotating shaft.

[0007] A further technical solution of the present invention is: the ring cover is an integrated ring cover integrally connected to one end of the rotating shaft, a through hole that cooperates with the power receiving rod is provided in the middle of the integrated ring cover, the outer end of the power receiving rod is fixedly connected to the through hole in the middle of the integrated ring cover, and a sealing cover is provided on the outer side of the bearing, which is positioned in the inner hole of the rotating shaft and covers the bearing.

[0008] A further technical solution of the present invention is: the ring cover is a split ring cover connected to the inner side of one end of the rotating shaft and is circular as a whole. A through hole that cooperates with the power receiving rod is provided in the middle of the split ring cover. The outer side of the power receiving rod is fixedly connected to the through hole in the middle of the split ring cover. The rotating shaft extends inward away from the inner side of one end of the split ring cover to form a retaining wall.

[0009] A further technical solution of the present invention is: the slide groove is a stepped groove formed by the end surface of the stationary shaft close to the ring cover being recessed inwardly, the spring is arranged in the stepped groove, the spring is pressed between the end surface of the power feeder rod away from the ring cover and the stepped surface inside the slide groove, the wire extends inwardly from the end surface of the stationary shaft at the end where the slide groove is not set into the slide groove and is connected to the power feeder rod.

[0010] A further technical solution of the present invention is: the slide groove passes through the end faces of both ends of the stationary shaft, a plug is fixedly connected to the inner side of the slide groove away from the ring cover, a spring is arranged in the slide groove between the inner end face of the plug and the end face of the power inlet rod away from the ring cover, the wire extends from the outside to the inside through the plug into the slide groove and is connected to the power inlet rod.

[0011] A further technical solution of the present invention is: a key slot is recessed on one side of the slide slot, and a convex block is protruding from the power inlet rod and positioned with the key slot of the slide slot.

[0012] A further technical solution of the present invention is: an outer surface of one end of the stationary shaft away from the ring cover is provided with an external thread for connecting to an electric spark wire cutting machine, and a screw hole for fixing a plug is provided on one side of the stationary shaft hole wall, and a top screw passes through the screw hole to fix the plug.

[0013] A further technical solution of the present invention is: the power inlet rod is positioned in the slide groove of the stationary shaft through a slider, a positioning hole is provided in the middle of the slider, one end of the power inlet rod is fixedly connected to the positioning hole, the wire passes through the slide groove of the stationary shaft from the outside to the inside and then enters the positioning hole of the slider to connect with the power inlet rod, the other end of the power inlet rod extends to the side where the ring cover is located and is supported by a circular stabilizing block positioned in the slide groove, and the power inlet rod passes through the stabilizing block and is connected to the inner end face of the receiving rod.

[0014] A further technical solution of the present invention is: a waterproof baffle capable of preventing water from entering the rotating shaft is fixedly connected to the outer surface of one end of the stationary shaft protruding from the rotating shaft; the waterproof baffle is generally annular and has a retaining ring protruding from one end of the waterproof baffle close to the rotating shaft.

[0015] The conductive device of the electric spark wire cutting machine tool of the present invention has the following beneficial effects:

[0016] 1. The stationary axis of the conductive device is installed on the wire rack of the EDM wire cutting machine. The current is transmitted to the molybdenum wire through the conductor, the current feeding rod, the current receiving rod, the rotating shaft, and the guide ring. The ring structure is used, and the conductive parts are arranged inside the ring. It does not rely on the front upper and lower wire rack guide wheels, which fundamentally solves the accuracy problem caused by the influence on the front guide wheel.

[0017] 2. The outer ring of the guide ring of the conductive device contacts the molybdenum wire for rolling conduction, and the inner ring of the guide ring is in a tight fit with the rotating shaft. A rotating shaft that rotates with the guide ring and a stationary shaft that does not rotate with the guide ring are arranged inside the guide ring. A receiving rod is arranged inside the rotating shaft, and a feeding rod is arranged inside the stationary shaft. The stationary shaft is connected and fixed to the machine tool, and a bearing is arranged between the rotating shaft and the stationary shaft. The rotating shaft rotates around the stationary shaft. The guide ring is arranged on the rotating shaft and is fixed at one side of the stationary shaft. When the molybdenum wire is centered in the middle of the wire rack and remains unchanged, the rotating shaft makes full use of the space of the wire rack to avoid the air, and has the useful effect of not affecting the stroke of the workbench.

[0018] 3. This conductive device utilizes a ring structure, and a bearing is arranged in the rotating shaft and a current rod structure is arranged in the stationary shaft, which can greatly shorten the length of the structure, play the effect of not affecting the original worktable stroke, and solve the problem of reducing the worktable stroke. The stationary shaft is fixed on the EDM machine tool by using the guide ring. The outer ring of the bearing rotates, and the inner ring of the bearing is fixed statically. The static fixing method of the inner ring of the bearing is the key to achieving a smaller fixed size, which is different from the previous improvement in which the outer ring of the bearing is fixed and the inner ring rotates. It is obvious that the inner diameter of the bearing is much smaller than the outer diameter of the bearing. The current copper sleeve fixed outer diameter of about 32 mm can be reduced to a shaft fixed size of about 10 mm, which is convenient for expanding the hole and installing at the original conductive block.

[0019] 4. The fixing method of the conductive device achieves the progress from bilateral fixing to unilateral fixing, and solves the technical requirements of requiring small fixing dimensions, realizing installation without relying on the front guide wheel, and being able to be modified on the wire rack behind the front guide wheel. At the same time, the technical requirements of unilateral fixing are realized. The rotating end of the conductive friction contact part of the conductive device relies on the outer ring of the bearing to ensure coaxiality. The conductive friction contact part at the rotating end is the power receiving rod, which is coaxial with the rotating shaft. The rotating shaft is fixed on the outer ring of the bearing and is coaxial with the outer ring of the bearing; the other relatively static end relies on the inner ring of the bearing to ensure coaxiality. The conductive friction contact part at the relatively static end is the power input rod, which is installed in the static shaft and is coaxial with the static shaft. The static shaft is fixed on the inner ring of the bearing and is coaxial with the inner ring of the bearing. The inner and outer rings of the bearing are coaxial, and the coaxiality of the conductive friction contact part is more reliably guaranteed. In addition, the coaxiality requirement of the conductive friction contact part relative to the static shaft can be reduced. It can be non-axial and can be an asymmetric cylindrical shape. As long as the contact surface is larger than the opposite contact diameter, its stable contact effect is the same as coaxiality. It can be seen that the radial runout of the conductive friction contact parts of the device is small, which greatly reduces the vibration of the conductive friction contact parts and reduces the discharge loss caused by radial runout, and has the advantages of more wear-resistant receiving rods and feeding rods.

[0020] 5. The device of the present invention solves the problems of poor conductive efficiency, travel influence, over-reliance on the front guide wheel, poor precision and the like in the current rolling conductive method, and truly realizes the upgrade and replacement of the traditional conductive block. Compared with the traditional conductive block, it does not break the wire, saves molybdenum wire and reduces production costs, saves the manual labor of wire loading and unloading, and rolling conductive method reduces wire transportation resistance compared with friction conductive method, and also has a positive effect on processing precision.

[0021] The conductive device of the wire-cut electric discharge machine tool of the present invention will be further described below in conjunction with the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of a first embodiment of a conductive device of an electric spark wire cutting machine tool of the present invention;

[0023] Figure 2 It is a schematic diagram of the position of the conductive device of the electric spark wire cutting machine tool of the present invention installed on the electric spark wire cutting machine tool;

[0024] Figure 3 It is a schematic diagram of the position of the conductive device of the electric spark wire cutting machine tool of the present invention installed in the wire frame of the electric spark wire cutting machine tool;

[0025] Figure 4 It is a structural schematic diagram of a second embodiment of a conductive device of an electric spark wire cutting machine tool of the present invention;

[0026] Figure 5 It is a structural schematic diagram of Embodiment 3 of the conductive device of the wire-cut electric discharge machine tool of the present invention;

[0027] Explanation of the accompanying numbers: 1-guide ring, 2-rotating shaft, 3-power receiving rod, 4-bearing, 5-power inlet rod, 6-slider, 7-conducting wire, 8-spring, 9-stationary shaft, 10-ring cover, 11-slide groove, 12-circlip, 13-top screw, 14-waterproof baffle, 15-positioning ring, 16-plug, 17-stabilizing block, 19-sealing cover, 20-keyway, 21-bump, 22-molybdenum wire cylinder, 23-conductive device, 24-front guide wheel, 25-wire rack, 26-retaining ring, 27-retaining wall. DETAILED DESCRIPTION

[0028] Embodiment 1:

[0029] like Figure 1 As shown, the conductive device of the wire-cut electric discharge machine tool of the present invention comprises a rotating shaft 2, a guide ring 1, a bearing 4, a ring cover 10, a stationary shaft 9, a spring 8, a current feeding rod 5, a current receiving rod 3, and a conductor 7.

[0030] The rotating shaft 2 is a cylindrical conductor, the outer surface of which is used to install the guide ring 1, and the inner hole is used to install the bearing 4. A bearing 4 installation position is provided in the rotating shaft 2. The bearing 4 is installed in the bearing 4 installation position in the inner hole of the rotating shaft 2. The bearing 4 is a ceramic bearing, the outer ring of the bearing 4 is connected to the rotating shaft 2, and the inner ring of the bearing 4 is connected to the stationary shaft 9, so that the rotating shaft 2 rotates around the stationary shaft 9, but no current is conducted through the bearing 4 between the rotating shaft 2 and the stationary shaft 9.

[0031] The guide ring 1 is an overall annular conductor. The outer ring surface of the guide ring 1 is provided with a groove for contacting with the cut molybdenum wire for rolling and conducting electricity. The inner ring is provided with a hole for fixing on the rotating shaft 2. The guide ring 1 can be made of YG3X hard alloy material. The guide ring 1 is sleeved outside the rotating shaft 2. In this embodiment, the guide ring 1 is fixedly sleeved outside the rotating shaft 2 by interference fit, and the guide ring 1 and the rotating shaft 2 are mutually conductive.

[0032] The ring cover 10 is a conductor fixedly connected to one end of the rotating shaft 2. In this embodiment, the ring cover 10 is an integrated ring cover integrally connected to one end of the rotating shaft 2. The rotating shaft 2 and the integrated ring cover can be made of 7075 aluminum alloy material. The ring cover 10 not only seals one end of the bearing 4 but also serves as a conductor between the current receiving rod 3 and the rotating shaft 2.

[0033] The stationary shaft 9 is inserted into the rotating shaft 2 from the end of the rotating shaft 2 away from the ring cover 10 and passes through the inner hole of the bearing 4 in the rotating shaft 2, that is, the stationary shaft 9 is connected to the inner ring of the bearing 4. The end of the stationary shaft 9 close to the ring cover 10 is positioned relative to the bearing 4 by the retaining spring 12 clamped on its outer surface. Of course, as a variation of the present invention, the stationary shaft 9 can also be connected to the inner ring of the bearing 4 through interference fit. The end of the stationary shaft 9 protruding outside the rotating shaft 2 is the connection end connected to the electric spark wire cutting machine. The end surface of the stationary shaft 9 close to the ring cover 10 is inwardly recessed and provided with a slide groove 11. In this embodiment, the slide groove 11 is a step groove formed by the end surface of the stationary shaft 9 close to the ring cover 10 being inwardly recessed, that is, the slide groove 11 does not penetrate the stationary shaft 9, and a key groove 20 is recessed on one side of the slide groove 11. The cross section of the slide groove 11 is in the shape of a round key groove 20. The power supply rod 5 and the power receiving rod 3 are columnar conductors, respectively. The power supply rod 5 and the power receiving rod 3 can be made of YG3X hard alloy material. The power inlet rod 5 is positioned in the slide groove 11 of the stationary shaft 9. A protrusion 21 is protruding from one side of the surface of the power inlet rod 5 and is positioned with the key groove 20 of the slide groove 11. Through the mutual positioning of the protrusion 21 of the power inlet rod 5 and the key groove 20, the power inlet rod 5 will not rotate in the stationary shaft 9 and can only slide in the axial direction.

[0034] The spring 8 is arranged inside the slide groove 11 of the stationary shaft 9 and is pressed by the end face of one end of the power feeding rod 5. The spring 8 can be a stainless steel compression spring. Furthermore, the spring 8 is arranged in the stepped groove of the stationary shaft 9, and the spring 8 is pressed between the end face of one end of the power feeding rod 5 away from the ring cover 10 and the stepped surface inside the slide groove 11. The outer side of the power receiving rod 3 is fixed to the middle part of the ring cover 10, wherein specifically, the middle part of the integrated ring cover 10 is provided with a through hole that cooperates with the power receiving rod 3, and the outer end of the power receiving rod 3 is fixedly connected to the through hole in the middle part of the integrated ring cover 10, and the inner side of the power receiving rod 3 extends into the slide groove 11 and is in frictional contact with the power feeding rod 5. The power feeding rod 5 is always pushed outward under the pressure of the spring 8, so the power feeding rod 5 always has a tendency to slide outward, and can always maintain frictional contact with the inner end of the power receiving rod 3 for electrical conduction.

[0035] The wire 7 extends from the end of the stationary shaft 9 away from the ring cover 10 into the slide groove 11 and is connected to the power supply rod 5. In this embodiment, the wire 7 extends from the end face of the stationary shaft 9 at one end without the slide groove 11 through the end face and extends inward into the slide groove 11 and is connected to the power supply rod 5. The connection method can be welding. The other end of the wire 7 is connected to the power supply. The outer side of the bearing 4 is provided with a sealing cover 19 positioned in the inner hole of the rotating shaft 2 and shielding the bearing 4. The outer side of the sealing cover 19 is also provided with a retaining spring 12 for clamping the sealing cover 19. The conductive path of the conductive device 23 is: the current is conducted through the guide ring 1, the rotating shaft 2, the ring cover 10, the power receiving rod 3, the power supply rod 5, and the wire 7.

[0036] When using, Figure 2 , 3 As shown, the conductive device 23 is connected to the electric spark wire cutting machine through the connection end of the stationary shaft 9. The conductive device 23 is installed on the wire frame 25 behind the front guide wheel 24. The machine fixes the connection end of the stationary shaft 9. There are many fastening methods, such as radially setting a top screw 13 in the mounting hole, and using the top screw 13 to press the connection end of the stationary shaft 9 to achieve fixation. The rotating shaft 2 is on the side of the wire frame 25 that avoids air, and the stationary shaft 9 is fixed on the side of the wire frame 25 with a hole. Figure 3 The conductive device 23 of the present invention shown in the figure realizes the convenience of expanding the hole at the original conductive block for installation. It solves the technical requirements of small fixed outer dimensions, independent of the front guide wheel 24 for installation, and can be fixed on the wire frame 25 behind the front guide wheel 24 on one side. Figure 3 The conductive device 23 of the present invention shown in the figure does not increase the width of the wire rack 25, and achieves the technical requirement of not affecting the travel of the workbench. After installation, the molybdenum wire is wound on the molybdenum wire cylinder during operation, and the power line is connected to the conductor 7 and the cutting wire (molybdenum wire) is pressed on the guide ring 1 for conduction.

[0037] Embodiment 2:

[0038] like Figure 4 As shown, the conductive device of the electric spark wire cutting machine tool of the present invention is different from the first embodiment in that: the guide ring 1 is sleeved on the outside of the rotating shaft 2 through the positioning ring 15, the positioning ring 15 is a conductor, the guide ring 1 is first sleeved on the outside of the positioning ring 15, and the positioning ring 15 is then fixedly sleeved on the outside of the rotating shaft 2. During assembly, the inner ring hole of the positioning ring 15 is slidably matched with the rotating shaft 2, and the tightness relationship between the positioning ring 15 and the rotating shaft 2 is controlled by the top screw 13 arranged in the inner radial direction of the positioning ring 15. The outer ring of the positioning ring 15 is interference fit with the inner ring of the guide ring 1, and an annular step is provided at one end of the outer ring of the positioning ring 15 to facilitate the coaxiality of the guide ring 1. The guide ring 1 and the positioning ring 15 can also be bonded and tightened with anaerobic adhesive. In this way, the disassembly and assembly of the guide ring 1 and the rotating shaft 2 are very convenient. The positioning ring 15 can be made of 7075 aluminum alloy material.

[0039] Another difference from the first embodiment is that the ring cover 10 is a split ring cover connected to the inner side of one end of the rotating shaft 2 and is circular as a whole. A through hole is provided in the middle of the split ring cover to cooperate with the power receiving rod 3. The outer side of the power receiving rod 3 is fixedly connected to the through hole in the middle of the split ring cover. The rotating shaft 2 extends inwardly to form a retaining wall 27 away from the inner side of the end of the split ring cover. The outer ring of the split ring cover is interference fit with the inner ring of the rotating shaft 2. A retaining spring 12 can also be used on the inner side of the rotating shaft 2 to prevent the split ring cover from shifting. The middle part of the split ring cover protrudes to form a boss, and the middle through hole passes through the boss. The inner hole of the split ring cover is slidably matched with the power receiving rod 3. The tightness relationship between the split ring cover and the power receiving rod 3 is controlled by the top screw 13 arranged radially inside the split ring cover, so that the power receiving rod 3 can be easily disassembled and assembled on the rotating shaft 2. The bearing 4 can be made of silicon nitride hybrid bearing, the ball is made of silicon nitride material, the inner and outer rings are made of bearing steel, and the stationary shaft 9 can be made of ordinary steel. The outer surface of the stationary shaft 9 away from the ring cover 10 (i.e., the connecting end) is provided with an external thread for connecting to the electric spark wire cutting machine, which is convenient for disassembly and assembly with the machine. A screw hole for fixing the plug 16 is provided on one side of the hole wall of the stationary shaft 9, and the top screw 13 passes through the screw hole to fix the plug 16, which is convenient for disassembly and assembly of the plug 16. The outer surface of the end of the stationary shaft 9 protruding from the rotating shaft 2 is fixedly connected with a waterproof baffle 14 that can prevent water from entering the rotating shaft 2. The waterproof baffle 14 is in a circular ring shape as a whole. The waterproof baffle 14 is protruding from the end of the rotating shaft 2 and is provided with a retaining ring 26. The retaining ring 26 wraps a small part of the outer ring of the rotating shaft 2, which can strengthen the prevention of water from entering the rotating shaft 2.

[0040] Another difference from the first embodiment is that: in order to facilitate the processing of the chute 11 and the disassembly and assembly of the power inlet rod 5, the chute 11 passes through the end faces of both ends of the stationary shaft 9, and a plug 16 is fixedly connected to the inner side of the end of the chute 11 away from the ring cover 10. The chute 11 can be processed into a through hole, and then the plug 16 is set to block it back. The spring 8 is arranged in the chute 11 between the inner end face of the plug 16 and the end face of the power inlet rod 5 away from the ring cover 10. The wire 7 extends from the outside to the inside through the plug 16 into the chute 11 and is connected to the power inlet rod 5. The plug 16 can be fixed by the top screw 13 arranged radially on the stationary shaft 9. A through hole is arranged in the middle of the plug 16 to facilitate the passage of the wire 7. The wire 7 passes through the through hole of the plug 16 and enters the chute 11 to connect with the power inlet rod 5. It can be directly welded, or a dovetail groove can be arranged at the end of the power inlet rod 5 and the wire 7 can be plugged tightly and then tinned and welded. The other structures and usage methods are the same as those in the first embodiment and will not be described in detail here. However, their implementation can also achieve the technical effects of the first embodiment.

[0041] Embodiment three:

[0042] like Figure 5As shown, a conductive device of an electric spark wire cutting machine tool of the present invention is different from the first and second embodiments in that: the feed rod 5 is positioned in the slide groove 11 of the stationary shaft 9 through the slider 6, and a positioning hole is provided in the middle of the slider 6. One end of the feed rod 5 is fixedly connected to the positioning hole. The wire 7 passes through the slide groove 11 of the stationary shaft 9 from the outside to the inside and then enters the positioning hole of the slider 6 to connect with the feed rod 5. The other end of the feed rod 5 extends to the side where the ring cover 10 is located and is supported by the annular stabilizing block 17 positioned in the slide groove 11. The feed rod 5 passes through the stabilizing block 17 and is connected to the inner end face of the receiving rod 3. The outer shape of the slider 6 is slidably matched with the slide groove 11. The slider 6 is provided with a positioning hole connected to the main body of the feed rod 5. The positioning hole is radially provided with two screw holes. The feed rod 5 and the slider 6 can be fixed by passing a radially arranged top screw 13 through the screw hole. After the feed rod 5 and the wire 7 are connected, they can be fixed by passing a radially arranged top screw 13 through the screw hole. A stabilizing block 17 is provided at the front of the main body of the inlet rod 5. The shape of the stabilizing block 17 is tightly matched with the slide groove 11, and the inner hole of the stabilizing block 17 is slidably matched with the main body of the inlet rod 5 to prevent radial vibration of the main body of the rod. The friction resistance of the rod in this structure is small, and it is easy to manufacture and install. The other structures are the same as those in the first or second embodiment, and will not be described in detail here. Its implementation can also achieve the technical effect of the first embodiment.

[0043] The above embodiments are only preferred embodiments of the present invention. The structure of the present invention is not limited to the forms listed in the above embodiments. Any modifications, equivalent substitutions, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A conductive device for an electric spark wire cutting machine tool, characterized in that: The invention comprises a rotating shaft (2), a guide ring (1), a bearing (4), a ring cover (10), a stationary shaft (9), a spring (8), a current feeding rod (5), a current receiving rod (3), and a conductor (7). The rotating shaft (2) is a cylindrical conductor. The bearing (4) is installed in the inner hole of the rotating shaft (2). The guide ring (1) is an overall ring-shaped conductor. The guide ring (1) is sleeved outside the rotating shaft (2). The ring cover (10) is a conductor fixedly connected to one end of the rotating shaft (2). The stationary shaft (9) is inserted into the rotating shaft (2) from the end of the rotating shaft (2) away from the ring cover (10) and passes through the inner hole of the bearing (4) in the rotating shaft (2). The end of the stationary shaft (9) protruding outside the rotating shaft (2) is connected to the conductor. The connecting end of the spark wire cutting machine tool is provided with a groove (11) recessed inwardly on the end surface of the stationary shaft (9) close to the ring cover (10), the power supply rod (5) and the power receiving rod (3) are respectively conductive bodies, the power supply rod (5) is positioned in the groove (11) of the stationary shaft (9), the spring (8) is arranged on the inner side of the groove (11) of the stationary shaft (9) and is pressed by the end surface of one end of the power supply rod (5), the outer side of the power receiving rod (3) is fixed to the middle of the ring cover (10), the inner side of the power receiving rod (3) extends into the groove (11) and contacts with the power supply rod (5), and the wire (7) extends from the end of the stationary shaft (9) away from the ring cover (10) into the groove (11) and is connected to the power supply rod (5).

2. The conductive device of the electric spark wire cutting machine tool according to claim 1, characterized in that: The guide ring (1) is sleeved on the outside of the rotating shaft (2) through a positioning ring (15). The positioning ring (15) is a conductor. The guide ring (1) is first sleeved on the outside of the positioning ring (15), and the positioning ring (15) is then fixedly sleeved on the outside of the rotating shaft (2).

3. The conductive device of the electric spark wire cutting machine tool according to claim 1, characterized in that: The ring cover (10) is an integrated ring cover integrally connected to one end of the rotating shaft (2); a through hole cooperating with the power receiving rod (3) is provided in the middle of the integrated ring cover; the outer end of the power receiving rod (3) is fixedly connected to the through hole in the middle of the integrated ring cover; and a sealing cover (19) is provided on the outer side of the bearing (4) and is positioned in the inner hole of the rotating shaft (2) and shielding the bearing (4).

4. The conductive device of the electric spark wire cutting machine tool according to claim 1, characterized in that: The ring cover (10) is a split ring cover connected to the inner side of one end of the rotating shaft (2) and is circular in shape as a whole. A through hole cooperating with the power receiving rod (3) is provided in the middle of the split ring cover. The outer side of the power receiving rod (3) is fixedly connected to the through hole in the middle of the split ring cover. The rotating shaft (2) extends inwardly from the inner side of one end of the split ring cover away from the inner side of the split ring cover to form a retaining wall (27).

5. The conductive device for a wire-cut electric discharge machine tool according to claim 1, characterized in that: The slide groove (11) is a stepped groove formed by an inward depression of the end surface of the stationary shaft (9) close to the ring cover (10). The spring (8) is arranged in the stepped groove. The spring (8) is pressed between the end surface of the power feed rod (5) away from the ring cover (10) and the inner stepped surface of the slide groove (11). The wire (7) extends inward from the end surface of the stationary shaft (9) at the end where the slide groove (11) is not provided to the slide groove (11) and is connected to the power feed rod (5).

6. The conductive device for a wire-cut electric discharge machine tool according to claim 1, characterized in that: The slide groove (11) passes through the end faces of both ends of the stationary shaft (9); a plug (16) is fixedly connected to the inner side of the end of the slide groove (11) away from the ring cover (10); a spring (8) is arranged in the slide groove (11) between the inner end face of the plug (16) and the end face of the power inlet rod (5) away from the ring cover (10); and the wire (7) passes through the plug (16) from the outside to the inside and extends into the slide groove (11) and is connected to the power inlet rod (5).

7. The conductive device of the electric spark wire cutting machine tool according to claim 5 or 6, characterized in that: A key slot (20) is recessed on one side of the slide slot (11), and a protruding block (21) is protruded on the power inlet rod (5) and is positioned with the key slot (20) of the slide slot (11).

8. The conductive device for a wire-cut electric discharge machine tool according to claim 6, characterized in that: An outer surface of one end of the stationary shaft (9) away from the ring cover (10) is provided with an external thread for connecting to an electric spark wire cutting machine, and a screw hole for fixing a plug (16) is provided on one side of the hole wall of the stationary shaft (9), and a top screw (13) passes through the screw hole to fix the plug (16).

9. The conductive device for a wire-cut electric discharge machine tool according to claim 1, characterized in that: The power inlet rod (5) is positioned in the slide groove (11) of the stationary shaft (9) through the slider (6). A positioning hole is provided in the middle of the slider (6). One end of the power inlet rod (5) is fixedly connected to the positioning hole. The wire (7) passes through the slide groove (11) of the stationary shaft (9) from the outside to the inside and then enters the positioning hole of the slider (6) to connect with the power inlet rod (5). The other end of the power inlet rod (5) extends to the side where the ring cover (10) is located and is supported by a circular ring-shaped stabilizing block positioned in the slide groove (11). After the power inlet rod (5) passes through the stabilizing block (17), it is connected to the inner end face of the receiving rod (3).

10. The conductive device of the electric spark wire cutting machine tool according to claim 1, characterized in that: A waterproof baffle (14) capable of preventing water from entering the rotating shaft (2) is fixedly connected to the outer surface of one end of the stationary shaft (9) protruding outside the rotating shaft (2); the waterproof baffle (14) is generally annular in shape; and a retaining ring (26) is protruding from one end of the waterproof baffle (14) close to the rotating shaft (2).

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