A power feeding device for electric machining machine tool turntable

Abstract

A power feeding device for an electric machining machine turntable is installed in the center hole of the turntable spindle, and includes an insulating gland, a carbon brush shaft, a carbon brush mechanism, a liquid-proof ring, and a power feeder. The carbon brush shaft is provided with at least two carbon brush holes of a stacked design, and a carbon brush mechanism is installed in the carbon brush hole. The carbon brush mechanism includes a carbon brush head, an elastic member, and an adjusting member. The carbon brush shaft is provided with a fixing hole on at least one side of each carbon brush hole, and a fixing member for pressing the adjusting member is provided in the fixing hole. This scheme installs a carbon brush head in the carbon brush hole provided on the carbon brush shaft through the structural design of the carbon brush shaft and various components. This stacked structure cleverly utilizes the space between the carbon brush shaft and the center hole of the turntable spindle, allowing the carbon brush head to slide and fit precisely and evenly for conductivity, and the setting of the adjusting member allows the entire carbon brush mechanism to be reliably, firmly, and adjustably fixed, ensuring that the sliding fit between the carbon brush head and the turntable spindle is more reliable, avoiding poor contact, ensuring reliable power feeding, and providing good power feeding capacity.

Description

Technical Field

[0001] The invention relates to the technical field of electric spark machining machine tools, in particular to a power feeding device for an electric spark machining machine tool turntable arranged in a center hole of a turntable main shaft. Background Art

[0002] Electromachining is a machining method that utilizes the discharge corrosion effect between the electrode and the workpiece, and generally uses a high-frequency pulse circuit for discharge. Existing EDM machines are usually three-axis linear motion operations. Of the two electrode wires led out from the control cabinet, one is connected to the spindle head that clamps the electrode, and the other is connected to the workpiece or the metal magnetic suction table where the workpiece is placed. The defect of this type of EDM machine is that the workbench used to mount the workpiece is a fixed workbench and cannot drive the workpiece to rotate. An additional rotating turntable is required, and the connection and conductivity between the machining power supply and the machine tool in the turntable spindle has become a problem that needs to be solved.

[0003] On November 18, 2015, Chinese patent CN204771005U announced the authorization of a utility model patent with patent number "201520423125.5" and title "Electrical discharge machining machine with rotary table" (hereinafter referred to as "reference document 1"), see the attachment of reference document 1. Figure 1 , Comparative Document 1 has a conductive ring 16 installed on the chuck side (the side connected to the chuck) of the insulating disk 4, and a connecting wire 5 is provided between the conductive ring and the chuck, and the electrical connection between the two is achieved through the wire. The conductive ring is provided with a carbon brush device, and the carbon brush device is provided with a carbon brush 15, and the outer end face of the carbon brush is in contact with the disk surface of the conductive ring, so that the outer end face of the carbon brush always keeps in contact with the disk surface of the conductive ring during the rotation of the conductive ring with the turntable, thereby forming a circuit in which the electrode wire, carbon brush, conductive ring, chuck and workpiece are connected in sequence. After analysis and research, this scheme is used for feeding the rotary table of electrolytic machining machine tools, suitable for feeding kiloamperes of large current, and the structure is very large, which is not very suitable for feeding the rotary table of small and medium current electrolytic machining machine tools.

[0004] On October 1, 2019, Chinese patent CN110293271A published an invention patent with application number 201910617893.7 and patent name "Conductive shaft device for large horizontal CNC electrolytic machining machine tool" (hereinafter referred to as "reference document 2"), see the attachment of reference document 2. Figure 1 and attached Figure 4, the carbon brushes 7 in the comparative document 2 are radially arranged on the two end faces of the substrate 6, the ends of the carbon brushes 7 are in close contact with the conductive shaft body 5, the carbon brushes 7 pass through and are fixed in the carbon brush sleeve 21, the carbon brush holder 20 is obliquely installed on the substrate 6, and the carbon brush sleeve 21 and the carbon brush holder 20 are snap-fitted. The inventors have analyzed and found that although the structure of the comparative document 2 can realize the power feeding of the electric machining turntable, since the carbon brushes 7 are located on the outside of the conductive shaft body 5, during the electric machining process, due to the operation of the conductive shaft body 5 and the splashing of the working fluid, the conductive shaft body 5 and the carbon brushes 7 will be attached with corrosion, debris and other sundries, which will cause the problem of poor conductive contact. At the same time, the structure of this scheme is not compact, which is not conducive to the overall structural layout of the electric machining machine tool.

[0005] In view of this, how to solve the problems of poor contact between the carbon brush and the spindle and the overly bulky conductive structure of the carbon brush when the machining power supply of the turntable spindle is connected to the machine tool in the prior art has become the subject to be studied and solved by the present invention. Summary of the invention

[0006] The present invention provides a power feeding device for a turntable of an electric machining machine tool, and its purpose is to solve the problems in the prior art of poor contact between the carbon brush and the spindle when the machining power supply of the turntable spindle is connected to the machine tool, the carbon brush conductive structure is too bloated, etc., so that the turntable power feeding is reliable, the structure is compact, and the internal space of the turntable can be fully utilized.

[0007] To achieve the above object, the technical solution adopted by the present invention is: a power feeding device for a rotary table of an electric machining machine tool, the innovation of which is that the power feeding device is installed in the center hole of the rotary table spindle, and the power feeding device includes an insulating gland, a carbon brush shaft, a carbon brush mechanism, a liquid-proof ring, and a power feeder;

[0008] The carbon brush shaft is located in the installation space formed by the insulating gland, the liquid-proof ring and the turntable main shaft;

[0009] At least two carbon brush holes are formed on the carbon brush shaft, and the carbon brush holes are spaced apart in an axial direction of the carbon brush shaft in a stacked state in an upper and lower position relationship;

[0010] A carbon brush mechanism is installed in the carbon brush hole, and the carbon brush mechanism includes a carbon brush head, an elastic member, an adjusting member and a flexible conductive wire braid. The adjusting member, the elastic member and the carbon brush head are installed in sequence along the opening direction of the carbon brush hole, and the opening direction of the carbon brush hole toward one end of the carbon brush head is defined as the front. The front end of the carbon brush head extends a distance toward the opening direction of the carbon brush hole and has an arc-shaped contact surface. The diameter of the arc-shaped contact surface is the same as the diameter of the inner hole of the turntable main shaft. The contact surface is slidably matched with the inner hole of the turntable main shaft. One end of the elastic member is against the carbon brush head, and the other end is against the adjusting member. The brush head has a tendency to move toward the front end of the carbon brush hole under the deformation effect of the elastic member and the limiting effect of the adjusting member, ensuring that the contact surface of the carbon brush head is tightly matched with the inner hole of the turntable spindle; the adjusting member includes an adjusting body and a pressing sheet, the pressing sheet has at least one pressing section and at least one side section connected to the pressing section, one end face of the pressing section abuts against the end face of the adjusting body, the side section of the pressing sheet and the adjusting body are separated from each other in the adjusting state and are tightly attached to each other in the tightening state, one end of the flexible conductive wire braid is fixedly connected to the carbon brush head, and the other end is fixedly connected to the end face of the pressing section of the pressing sheet;

[0011] A fixing hole is provided on at least one side of each of the carbon brush holes on the carbon brush shaft, and the fixing hole penetrates into the space where the adjusting member is located in the carbon brush hole. A fixing member is provided in the fixing hole, and the fixing member contacts the outer side surface of the side segment of the pressing sheet along the axial direction of the fixing hole. After tightening the fixing member, the side segment of the pressing sheet is pressed against the adjusting body to fix the adjusting body.

[0012] Furthermore, the carbon brush hole is perpendicular to the axis of the carbon brush shaft, and the carbon brush hole is rectangular. The size of the carbon brush hole is consistent with the cross-section of the carbon brush head and a gap is left to allow the carbon brush head to slide freely in the carbon brush hole. The carbon brush holes are symmetrically arranged along the axis of the carbon brush shaft. In order to facilitate the adjustment and tightening of the adjustment body, the adjustment body is an adjusting screw. The carbon brush hole is processed with a double semi-lunar threaded portion at the other end of the carbon brush head. The diameter of the threaded portion is larger than the length of the short side of the rectangular carbon brush hole. A locking space is formed in the space left between the adjustment member and the long side of the rectangular hole. The side section of the pressing sheet is placed in the locking space. The adjustment body is screwed in and out of the threaded portion to adjust the elastic force of the elastic member. The left and right sides of the locking space have tightening portions established in a vertical direction. The side section of the pressing sheet in the tightening portion partially covers the adjustment body, and the tightening hole passes through the tightening portion.

[0013] Furthermore, in order to make the tightening of the adjusting body more firm and stable, the tightening holes are arranged on both sides of each of the carbon brush holes, the axial direction of the tightening holes is perpendicular to the tightening part, and the tightening piece is a tightening screw, and the tightening piece is in perpendicular contact with the outer side surface of the pressing piece side segment in the direction of the spiral axial force.

[0014] Furthermore, in order to facilitate the assembly and application of the carbon brush mechanism and to achieve a good tightening effect on the adjusting body, the pressing plate is a V-shaped pressing plate, and the surface of the V-shaped pressing plate corresponding to its opening direction is a pressing section, which is connected to the surface of the adjusting part facing the opening direction of the carbon brush hole, and the two side surfaces of the V-shaped pressing plate are side sections, and the two side sections of the V-shaped pressing plate partially cover the side surfaces of the adjusting body.

[0015] Furthermore, in order to correctly guide the forward displacement trend of the carbon brush head and prevent the carbon brush head from deviating after receiving the force of the deflected elastic part, because the deviation will cause the carbon brush head to rub against the inner hole of the turntable main shaft at an incorrect angle, causing abnormal wear and abnormal conductivity of the carbon brush head, a steel pipe is provided between the carbon brush head and the adjusting part, and the carbon brush hole has a limiting surface for limiting the steel pipe toward the opening direction of the carbon brush hole, the elastic part is installed in the steel pipe, and the deformation direction of the elastic part is guided forward in the axial direction of the steel pipe.

[0016] Furthermore, in order to make the carbon brush structure conduct electricity reliably and further enhance the power feeding capacity, the adjacent carbon brush holes are arranged at equal angles in the circumferential direction of the orthogonal projection of the carbon brush shaft. Preferably, the number of the carbon brush holes is three, and the angle between the orthogonal projections of the three carbon brush holes in the circumferential direction is 120°, and the carbon brush heads are located in different directions to contact the inner hole of the turntable main shaft.

[0017] Furthermore, in order to better fix the carbon brush shaft to the insulating gland, a through fixing hole is provided at the upper end of the carbon brush shaft and the lower end of the insulating gland, and a cylindrical pin is passed through the fixing hole to fasten the carbon brush shaft to the insulating gland. The insulating gland is fixed to the rear cover of the turntable by screws, and the inner wall of the rear cover of the turntable and the outer surface of the insulating gland in the fixing hole are in clearance fit.

[0018] Furthermore, a first annular sealing groove is provided on the lower surface of the insulating gland, a first sealing ring is installed in the first sealing groove for sealing with the rear cover plate of the turntable, the carbon brush shaft is fixedly connected to the liquid-proof ring by fasteners, a second sealing groove is provided on the outer surface of the liquid-proof ring, a second sealing ring is installed in the second sealing groove, to ensure the sealing of the feeding device, to prevent the working fluid and debris from entering the feeding device through the center hole of the turntable main shaft, and to prevent the carbon brush from being contaminated with debris and reducing the conductivity.

[0019] The relevant contents of the present invention are explained as follows:

[0020] 1. In the description of this application, the direction setting in the carbon brush hole is that "forward, outward" refers to the direction of the opening on the side where the carbon brush head is installed, and "inward, inward" refers to the opposite direction of the opening on the side where the carbon brush head is installed;

[0021] 2. In the description of the present application, it should be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "inner", "outer" and the like indicating positions or positional relationships are based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present application;

[0022] 3. In the description of this application, it should be understood that the descriptions such as "axial", "radial", "circumferential", etc. are descriptions based on the orientation or position relationship of the "carbon brush shaft", "turntable spindle", and "fastening hole" as shown in the accompanying drawings;

[0023] 4. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, "plurality" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0024] Due to the application of the above scheme, the present invention has the following advantages and effects compared with the prior art:

[0025] 1. In the above scheme of the present invention, the carbon brush shaft is installed in the center hole of the turntable main shaft for use through the structural design of the carbon brush shaft, and a carbon brush head mechanism is arranged on the carbon brush shaft for power feeding, which does not need to occupy too much machine space, and fully utilizes the internal space of the turntable. A power feeding device is arranged in the center hole of the turntable main shaft to achieve good power feeding, avoid bloated machines, and reduce the inconvenience caused by redesigning the machine tool structure;

[0026] 2. In the above scheme of the present invention, a carbon brush mechanism with a laminated structure is arranged on the carbon brush shaft, so that the array of carbon brushes is evenly distributed in the axial lamination. This structure cleverly utilizes the axial space between the carbon brush shaft and the center hole of the turntable main shaft, and complements the center hole structure of the turntable main shaft, so that the carbon brush head with a laminated design and the inner hole of the center hole of the turntable main shaft can slide and fit evenly to conduct electricity, thereby avoiding insufficient power feeding, having good power feeding capacity, ensuring reliable power feeding, and realizing large current feeding;

[0027] 3. In the above scheme of the present invention, the carbon brush shaft is located in the installation space formed by the insulating gland, the liquid-proof ring and the turntable main shaft, so that the feeding device and the turntable body are insulated and sealed, and the working fluid and debris are prevented from entering the working environment of the feeding device, so that the carbon brush head is always kept clean and will not be contaminated by debris, and the carbon brush head is prevented from being contaminated by debris and the gap or pollution layer is generated on the contact surface when the turntable main shaft rotates, thereby avoiding poor conductive contact and ensuring that the carbon brush head and the turntable main shaft always maintain good power feeding;

[0028] 4. In the above scheme of the present invention, the adjusting member can be adjusted to be installed at the rear end of the carbon brush hole. In the working state, the carbon brush head and the inner hole of the turntable main shaft are always in a sliding friction state, and the end of the carbon brush head in contact with the turntable main shaft will be gradually shortened. The carbon brush head has a tendency to move toward the front of the carbon brush hole under the deformation of the elastic member, so that it maintains a long-term good power supply and reduces the adjustment and replacement cycle;

[0029] 5. At the same time, the structural setting of the adjusting body, pressing piece and fasteners adopted, after adjusting the distance of the carbon brush head, use the fastener to press the side section of the pressing piece tightly against one side of the adjusting body, so that the adjusting body is in a stable and firmly fastened state, while avoiding the loosening of the adjusting body, it can ensure that the electrical machining current passes through the carbon brush shaft → fastener → pressing piece → flexible conductive wire braid → carbon brush head → the inner hole of the turntable spindle. The power supply is reliable to avoid the occurrence of poor contact. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Attached Figure 1 A first perspective stereoscopic diagram of an embodiment of a feeding device of the present invention;

[0031] Attached Figure 2 A second perspective perspective schematic diagram of an embodiment of a feeding device of the present invention;

[0032] Attached Figure 3 It is a front view of an embodiment of a feeding device of the present invention;

[0033] Attached Figure 4 for Figure 3 Schematic diagram of the cross section in the AA direction;

[0034] Attached Figure 5 for Figure 3 Schematic diagram of the cross section in the BB direction;

[0035] Attached Figure 6 for Figure 3 Schematic diagram of the cross section in the CC direction;

[0036] Attached Figure 7 for Figure 3 Schematic diagram of the cross section in the middle DD direction;

[0037] Attached Figure 8It is a first-view stereoscopic schematic diagram of a carbon brush mechanism in an embodiment of a power feeding device of the present invention;

[0038] Attached Fig. 9 A second perspective perspective schematic diagram of a carbon brush mechanism in an embodiment of a power feeding device of the present invention;

[0039] Attached Fig.10 It is a front view of the carbon brush mechanism in the embodiment of the feeding device of the present invention;

[0040] Attached Fig.11 for Fig.10 Schematic diagram of the cross section in the EE direction;

[0041] Attached Fig.12 A three-dimensional schematic diagram of a carbon brush shaft in an embodiment of a power feeding device of the present invention;

[0042] Attached Fig.13 It is a front view of the carbon brush shaft in the embodiment of the feeding device of the present invention;

[0043] Attached Fig.14 for Fig.13 Schematic diagram of the cross section in the FF direction;

[0044] Attached Fig.15 It is a cross-sectional view of the carbon brush shaft in a three-dimensional state in an embodiment of the feeding device of the present invention.

[0045] The various parts of the above drawings are shown as follows:

[0046] 1. Carbon brush shaft; 11. Carbon brush hole; 111. Locking space; 1111. Threaded portion; 1112. Fastening portion; 112. Limiting surface; 12. Fastening hole; 121. Fastening piece; 13. Fixing hole;

[0047] 2. Carbon brush mechanism; 21. Carbon brush head; 211. Contact surface; 22. Elastic member; 23. Adjustment member; 231. Adjustment body; 232. Pressing sheet; 2321. Pressing section; 2322. Side section; 24. Flexible conductive wire braid; 25. Steel pipe;

[0048] 3. Insulating gland; 31. First sealing groove; 32. First sealing ring;

[0049] 4. liquid-proof ring; 41. second sealing groove; 42. second sealing ring;

[0050] 5. Electrical parts input;

[0051] 6. Pillar pin;

[0052] 7. Turntable spindle;

[0053] 8. Turntable rear cover. DETAILED DESCRIPTION

[0054] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0055] like Figures 1 to 15 As shown, an embodiment of the present invention provides a feeding device for an electric machining machine turntable, which is used to feed power to a rotating turntable spindle 7, wherein the carbon brush shaft 1 is installed in the center hole of the turntable spindle 7 and is sealed with the turntable spindle 7, a liquid-proof ring 4 is provided at the bottom of the carbon brush shaft 1, the upper end of the carbon brush shaft 1 is fixedly connected to the insulating gland 3, and the upper end of the carbon brush shaft 1 is connected with a power feeder 5 after passing through the insulating gland 3, the carbon brush shaft 1 is located in an installation space formed by the insulating gland 3, the liquid-proof ring 4 and the turntable spindle 7, and the carbon brush shaft 1 and the turntable spindle 7 are located on the same axis; at least two carbon brush holes 11 are provided on the carbon brush shaft 1 and are arranged at intervals along the axial direction of the carbon brush shaft 1, and each carbon brush hole 11 is in a stacked state in an upper and lower relationship, that is, the carbon brush holes 11 in an upper and lower position relationship are arranged layer by layer in the axial direction of the carbon brush shaft 1, and the space of the carbon brush shaft 1 and the turntable spindle 7 is fully utilized for the arrangement.

[0056] A carbon brush mechanism 2 is installed in the carbon brush hole 11, and the carbon brush mechanism 2 includes a carbon brush head 21, an elastic member 22, an adjusting member 23 and a flexible conductive wire braid 24. The adjusting member 23, the elastic member 22 and the carbon brush head 21 are installed in sequence along the opening direction of the carbon brush hole 11. The carbon brush head 21 extends a distance toward the front end of the opening direction of the carbon brush hole 11 and has an arc-shaped contact surface 211. The diameter of the arc-shaped contact surface 211 is the same as the diameter of the inner hole of the turntable spindle 7. The contact surface 211 is slidably matched with the inner hole of the turntable spindle 7. One end of the elastic member 22 is against the carbon brush head 21, and the other end is against the adjusting member 23. Under the deformation action of the elastic member 22 and the limiting action of the adjusting member 23, the carbon brush head 21 has a tendency to move toward the front end of the carbon brush hole 11, thereby ensuring that the contact surface of the carbon brush head 21 is tightly matched with the inner hole of the turntable spindle 7. The adjusting member 23 can be adjusted to be installed at the rear end of the carbon brush hole 11. In the working state, the carbon brush head 21 and the turntable main shaft 7 are always in a sliding friction state. The end of the carbon brush head 21 that contacts the inner hole of the turntable main shaft 7 will be gradually shortened. The carbon brush head 21 has a tendency to move toward the front of the carbon brush hole 11 under the deformation action of the elastic member 22, so that it maintains long-term good power supply and reduces the adjustment and replacement cycle.

[0057] In the above scheme, if Figures 8 to 11As shown, the adjusting member 23 includes an adjusting body 231 and a pressing plate 232, the pressing plate 232 has at least one pressing section 2321 and at least one side section 2322 connected to the pressing section 2321, the end face of the pressing section 2321 abuts against the end face of the adjusting body 231, the side section 2322 of the pressing plate 232 and the adjusting body 231 are separated from each other in the adjusting state and are pressed against each other in the tightening state, so that the adjustment of the adjusting body is more convenient and the tightening is more stable; at the same time, one end of the flexible conductive wire braid 24 is fixedly connected to the carbon brush head 21, and the other end is fixedly connected to the end face of the pressing section 2321, thereby increasing the good feeding performance.

[0058] In the above scheme, a fixing hole 12 is opened on at least one side of each of the carbon brush holes 11 on the carbon brush shaft 1, and the fixing hole 12 penetrates to the space where the adjusting member 23 is located in the carbon brush hole 11. A fixing member 121 is arranged in the fixing hole 12, and the fixing member 121 contacts the outer side surface of the side segment 2322 of the pressing sheet 232 along the axial direction of the fixing hole 12. After tightening the fixing member 121, the side segment 2322 of the pressing sheet 232 is pressed against the adjusting body 231 to fix the adjusting body 231. After tightening the fixing member 121, the fixing member 121 presses the side segment 2322 of the pressing sheet 232, so that the side segment 2322 of the pressing sheet 232 is tightly attached to the adjusting body 231, so that the position of the adjusting body 231 is fixed. Such a fixing method allows the adjusting body 231 to be fixed after adjustment and is convenient for adjustment and tightening.

[0059] Through the implementation of the embodiment of the present invention, the feeding device of the embodiment of the present invention uses the structural design of the carbon brush shaft 1 so that the carbon brush shaft 1 is installed in the center hole of the turntable main shaft 7 for use, and the carbon brush head 21 is installed in the carbon brush hole 11 of the laminated structure set on the carbon brush shaft 1. This structure cleverly uses the space between the carbon brush shaft 1 and the center hole of the turntable main shaft 7, so that the laminated carbon brush head 21 and the inner hole of the center hole of the turntable main shaft 7 can slide and fit evenly for conductivity, and the setting of the adjustment member 23 can make the entire carbon brush mechanism 2 reliably, firmly and adjustably fixed in the carbon brush hole 11, ensuring that the sliding fit between the carbon brush head 21 and the inner hole of the center hole of the turntable main shaft 7 is more reliable, avoiding poor contact, ensuring reliable feeding, and achieving larger current feeding.

[0060] In the embodiment of the present invention, the carbon brush shaft 1 has at least two carbon brush holes 11 arranged at intervals along the axial direction of the carbon brush shaft 1, the carbon brush hole 11 is perpendicular to the axis of the carbon brush shaft 1, the carbon brush hole 11 is rectangular, the size of the carbon brush hole 11 is consistent with the cross-section of the carbon brush head 21, and a gap is left to allow the carbon brush head 21 to slide freely in the carbon brush hole 11, the carbon brush holes 11 are symmetrically arranged along the axis of the carbon brush shaft 1, and these carbon brush holes 11 are arranged at equal angles in the circumferential direction of the orthographic projection of the carbon brush shaft 1, such as Figure 1 and Figures 5 to 7 As shown, taking three carbon brush holes 11 as an example, the angle of the projection of the three carbon brush holes 11 in the circumferential direction is 120°, if there are four carbon brush holes 11, the angle is 90°. This arrangement allows the carbon brush heads 21 installed in the carbon brush holes 11 to be distributed at equal angles, and the carbon brush heads 21 are evenly distributed on the inner hole of the center hole of the turntable main shaft 7, so that the sliding friction of the carbon brush heads 21 is more uniform when the turntable main shaft 7 rotates, thereby reducing the loss of the carbon brush heads 21 and improving the power feeding accuracy.

[0061] In the embodiment of the present invention, the adjusting body 231 is an adjusting screw, and the carbon brush hole 11 is processed with a double half-moon threaded portion 1111 at the other end of the carbon brush head 21, and the diameter of the threaded portion 1111 is greater than the length of the short side of the rectangular carbon brush hole 11, and the space left between the adjusting member 23 and the long side of the rectangular carbon brush hole 11 forms a locking space 111, and the side section 2322 of the pressing sheet 232 is placed in the locking space 111, and the adjusting body 231 is screwed in and out of the threaded portion 1111 to adjust the elastic force of the elastic member 22, and the left and right sides of the locking space 111 have vertical A fastening portion 1112 is established in the vertical direction, and the side section 2322 of the pressing piece 232 in the fastening portion 1112 partially covers the adjusting body 231, and the fastening hole 12 penetrates the fastening portion 1112. After the pressing piece 232 is installed in the adjusting body 231 and the fastening portion 1112, the adjusting body 231 and the fastening portion 1112 jointly limit the pressing piece 232. The pressing piece 232 is limited by the fastening portion 1112 and will not be separated from the fastening portion 1112 as the adjusting body 231 rotates, so that the fastening piece 121 can always cooperate with the pressing piece 232 after being tightened and unscrewed, thereby ensuring reliable and stable tightening.

[0062] In the above embodiment, if Figure 4As shown, a through fixing hole 13 is provided at the upper end of the carbon brush shaft 1 and the lower end of the insulating gland 3, and the pin 6 passes through the fixing hole 13 to fasten the carbon brush shaft 1 and the insulating gland 3; the carbon brush shaft 1 is fastened to the insulating gland 3, and a first annular sealing groove 31 is provided on the lower surface of the insulating gland 3, in which a first sealing ring 32 is installed, and the insulating gland 3 is fixed to the turntable rear cover 8 on the outside of the fixing hole 13 by fasteners, and the inner wall of the turntable rear cover 8 is gap-matched with the outer surface of the insulating gland 3 at the position of the fixing hole 13, and the pin 6 is limited by the turntable rear cover 8; at the same time, the carbon brush shaft 1 is fixedly connected to the liquid-proof ring 4 by fasteners, and a second sealing groove 41 is provided on the outer surface of the liquid-proof ring 4, and a second sealing ring 42 is installed in the second sealing groove 41, which is used to prevent the working fluid from entering the feeding device from the inner hole of the turntable main shaft 7, so as to complete the fixed installation and sealing of the feeding device and ensure that the seal is leak-proof.

[0063] In the above embodiment, if Figures 8 to 11 As shown, the pressing piece 232 is a V-shaped pressing piece 232, and the surface of the V-shaped pressing piece 232 corresponding to its opening direction is the pressing section 2321 of the V-shaped pressing piece 232, which is connected to the surface of the adjusting member 23 facing the opening direction of the carbon brush hole 11, and the two side surfaces of the V-shaped pressing piece 232 are the side sections 2322 of the V-shaped pressing piece 232, and the two side surfaces of the V-shaped pressing piece 232 are fully or partially covered on the side surface of the adjusting body 231. In the tightened state, the fixing piece 121 is tightened and pressed against the side section 2322 of the V-shaped pressing piece 232, so that the adjusting body 231 is fixed. When adjustment is needed, the fixing piece 121 is unscrewed to separate the side section 2322 of the V-shaped pressing piece 232 from the side surface of the adjusting body 231, so that the adjusting body 231 is in a state where it can be tightened and unscrewed, and it can be easily adjusted. The use of this structure of the U-shaped pressing piece 232 makes it easier and more convenient to install and fix the carbon brush hole 11 on the carbon brush shaft 1 and the adjustment body 231, and cleverly utilizes the space of the carbon brush shaft 1 itself, making the arrangement, adjustment and fixation of the carbon brush head 21 easier.

[0064] With respect to the above-mentioned embodiment, possible changes of the present invention are described as follows:

[0065] 1. In the above embodiments, Figure 4 As shown, a threaded hole is provided at the upper end of the carbon brush shaft 1, and a power supply member 5 is screwed in the threaded hole. The power supply member 5 is a power supply screw. In this way, the structure is simple, the connection is firm, and the power supply is reliable. Of course, the present invention is not limited to this, and other power supply structures can also be used as equivalent replacements;

[0066] 2. In the above embodiments, if Figures 5 to 7As shown, the elastic member 22 may be a compression spring, but the embodiment of the present invention is not limited thereto, and may also be other elements that can utilize elastic deformation to make the carbon brush head 21 have a tendency to move toward the front end of the carbon brush hole 11, such as a pressure spring tube, a torsion spring, etc., which can be understood and accepted by those skilled in the art, so the relevant mechanism will not be described in detail;

[0067] 3. In the above embodiment, the pin 6 may also be other cylindrical bodies extending in one direction that can play a similar role, and may be cylindrical pins, and may be in square, diamond, hexagonal or other shapes, but the present invention is not limited thereto;

[0068] 4. In the above embodiment, the elastic member 22 can be directly installed in the carbon brush hole 11 between the carbon brush head 21 and the adjusting member 23, but the present invention is not limited thereto. A steel tube 25 can also be provided between the carbon brush head 21 and the adjusting member 23. The carbon brush hole 11 has a limiting surface 112 for limiting the steel tube 25 toward the opening direction of the carbon brush hole 11. The elastic member 22 is installed in the steel tube 25. The deformation direction of the elastic member 22 is guided axially forward of the steel tube 25. It should be known that other structures that can be implemented as guiding protection for the elastic member are also equivalent replacements for the steel tube 25.

[0069] In addition, the installation technical requirements of a power feeding device for an electric machining machine tool turntable according to an embodiment of the present invention are described as follows:

[0070] 1. Wipe the inner hole of the turntable main shaft 7 clean before installation; 2. After installation, use a multimeter to check that the contact resistance between the carbon brush head 21 and the turntable main shaft 7 is zero; 3. After assembly, the sealing ring ensures that there is no leakage.

[0071] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A power feeding device for an electric machining machine tool turntable, used for feeding power to a rotating turntable spindle (7), the power feeding device comprising an insulating gland (3), a carbon brush shaft (1), a carbon brush mechanism (2) and a power feeder (5), characterized in that: The carbon brush shaft (1) is installed in the center hole of the turntable main shaft (7) and is sealed with the turntable main shaft (7). A liquid-proof ring (4) is provided at the bottom of the carbon brush shaft (1). The upper end of the carbon brush shaft (1) is fixedly connected with the insulating gland (3). The upper end of the carbon brush shaft (1) passes through the insulating gland (3) and is connected with a power supply component (5). The carbon brush shaft (1) is located in the installation space formed by the insulating gland (3), the liquid-proof ring (4) and the turntable main shaft (7). The carbon brush shaft (1) and the turntable main shaft (7) are located on the same axis. At least two carbon brush holes (11) are provided on the carbon brush shaft (1), the carbon brush holes (11) are arranged at intervals along the axial direction of the carbon brush shaft (1), and the carbon brush holes (11) are in a stacked state in an upper and lower position relationship; A carbon brush mechanism (2) is installed in the carbon brush hole (11), and the carbon brush mechanism (2) includes a carbon brush head (21), an elastic member (22), an adjusting member (23) and a flexible conductive wire braid (24). The adjusting member (23), the elastic member (22) and the carbon brush head (21) are installed in sequence along the opening direction of the carbon brush hole (11), and the opening direction of the carbon brush hole (11) toward one end of the carbon brush head (21) is defined as the front; the front end of the carbon brush head (21) extends a distance toward the opening direction of the carbon brush hole (11) and has an arc-shaped contact surface (211), and the contact surface (211) is slidably matched with the inner hole of the turntable main shaft (7); one end of the elastic member (22) is against the carbon brush head (21), and the other end is against the adjusting member (23), and the carbon brush head (21) has a deformation effect of the elastic member (22) and a limiting effect of the adjusting member (23). The adjusting member (23) has a tendency to move toward the opening direction of the carbon brush hole (11); the adjusting member (23) comprises an adjusting body (231) and a pressing sheet (232); the pressing sheet (232) has at least one pressing section (2321) and at least one side section (2322) connected to the pressing section (2321); the end surface of the pressing section (2321) abuts against the end surface of the adjusting body (231); the side section (2322) of the pressing sheet (232) and the adjusting body (231) are separated from each other in an adjusting state and are closely attached to each other in a tightening state; one end of the flexible conductive wire braid (24) is fixedly connected to the carbon brush head (21), and the other end is fixedly connected to the end surface of the pressing section (2321); A fixing hole (12) is provided on at least one side of each of the carbon brush holes (11) on the carbon brush shaft (1), the fixing hole (12) penetrates to the space in the carbon brush hole (11) where the adjusting member (23) is located, a fixing member (121) is provided in the fixing hole (12), the fixing member (121) contacts the outer side surface of the side segment (2322) of the pressing plate (232) along the axial direction of the fixing hole (12), and after the fixing member (121) is tightened, the side segment (2322) of the pressing plate (232) is pressed against the adjusting body (231) to fix the adjusting body (231).

2. The feeding device according to claim 1, characterized in that: The adjusting body (231) is an adjusting screw; the carbon brush hole (11) is perpendicular to the axis of the carbon brush shaft (1); the carbon brush hole (11) is rectangular, the size of the carbon brush hole (11) is consistent with the cross section of the carbon brush head (21), and a gap is left to allow the carbon brush head (21) to slide freely in the carbon brush hole (11); the carbon brush holes (11) are symmetrically arranged along the axis of the carbon brush shaft (1), and the carbon brush hole (11) is processed with a double half-moon threaded portion (1111) at the other end of the carbon brush head (21), the diameter of the threaded portion (1111) is greater than the length of the short side of the rectangular carbon brush hole (11), and the adjusting member (231) is provided with a threaded portion (1111) having a diameter greater than the length of the short side of the rectangular carbon brush hole (11). 3) A locking space (111) is formed by a space left between the long sides of the rectangular carbon brush hole (11), and the side section (2322) of the pressing plate (232) is placed in the locking space (111); the adjusting body (231) is screwed in and out of the threaded portion (1111) to adjust the elastic force of the elastic member (22), and the left and right sides of the locking space (111) have fastening portions (1112) set up in a vertical direction, and the fastening portion (1112) is partially covered by the side section (2322) of the pressing plate (232), and the fastening hole (12) passes through the fastening portion (1112).

3. The feeding device according to claim 2, characterized in that: The fixing holes (12) are arranged on both sides of each carbon brush hole (11), the axial direction of the fixing hole (12) is perpendicular to the fixing portion (1112), the fixing member (121) is a fixing screw, and the fixing member (121) is in perpendicular contact with the outer side surface of the side segment (2322) of the pressing plate (232) in the direction of the spiral axial force.

4. The feeding device according to any one of claims 1 to 3, characterized in that: The pressing sheet (232) is a V-shaped pressing sheet (232), and the surface of the V-shaped pressing sheet (232) corresponding to its opening direction is a pressing section (2321), which is connected to the surface of the adjusting member (23) facing the opening direction of the carbon brush hole (11), and the two side surfaces of the V-shaped pressing sheet (232) are side sections (2322), and the two side surfaces of the V-shaped pressing sheet (232) partially cover the side surfaces of the adjusting body (231).

5. The feeding device according to claim 4, characterized in that: A steel pipe (25) is provided between the carbon brush head (21) and the adjusting member (23); the carbon brush hole (11) has a limiting surface (112) for limiting the steel pipe (25) in the direction of the opening of the carbon brush hole (11); the elastic member (22) is installed in the steel pipe (25); and the deformation direction of the elastic member (22) is guided forward in the axial direction of the steel pipe (25).

6. The feeding device according to claim 1, characterized in that: The carbon brush holes (11) are arranged at equal angles in the circumferential direction of the orthographic projection of the carbon brush shaft (1).

7. The feeding device according to claim 6, characterized in that: The number of the carbon brush holes (11) is three, the angle between the three carbon brush holes (11) projected in the circumferential direction is 120°, and the carbon brush heads (21) are respectively located in different circumferential directions and contact the inner hole of the turntable main shaft (7).

8. The feeding device according to claim 1, characterized in that: A through fixing hole (13) is provided at the upper end of the carbon brush shaft (1) and the lower end of the insulating gland (3), and a pin (6) is passed through the fixing hole (13) to securely connect the carbon brush shaft (1) and the insulating gland (3).

9. The feeding device according to claim 8, characterized in that: The insulating gland (3) is fixed to the turntable rear cover (8) by means of screws, and the inner wall of the turntable rear cover (8) is gap-matched with the outer surface of the insulating gland (3) at the position of the fixing hole (13).

10. The feeding device according to claim 9, characterized in that: The lower surface of the insulating gland (3) is provided with a first annular sealing groove (31), and a first sealing ring (32) is installed in the first sealing groove (31) for sealing with the turntable rear cover (8); the carbon brush shaft (1) is fixedly connected to the liquid-proof ring (4) by fasteners, and the outer surface of the liquid-proof ring (4) is provided with a second sealing groove (41), and a second sealing ring (42) is installed in the second sealing groove (41) for preventing working fluid from entering the feeding device from the inner hole of the turntable main shaft (7).

Images