Automatic grinding device for resistance spot welding electrode

Abstract

The invention relates to an automatic grinding device for a resistance spot welding electrode, which comprises a closed shell consisting of a left shell and a right shell, the appearances of the left shell and the right shell are in a mirror image relationship, and structural main body parts with main functions of electrode grinding, cutting displacement control, electrode grinding angle compensation and the like are all arranged in the closed shell. An electrode is milled and ground in a revolution and high-speed rotation mode of a multi-cutting-edge combined cutting tool, and the working surface of the ground electrode is a plane; under the condition of small electrode pressure, the to-be-repaired surface of the electrode is subjected to fixed-displacement micro milling and grinding; the electrode grinding angle can be compensated according to different bending of an electrode holder machine arm, axial vibration of a cutting tool in the grinding process is effectively restrained, and full contact between the working surface of an electrode and the surface of a workpiece in the welding process is guaranteed. According to the grinding principle, the remarkable positive effects can be achieved in the aspects of prolonging the service life of the cutting tool, extremely compressing the unnecessary cutting amount of the electrode, improving the welding spot quality, reducing the spot welding process cost and the like.

Description

Technical Field

[0001] The invention relates to process equipment for grinding resistance spot welding electrodes, in particular to an automatic grinder for resistance spot welding electrodes. Background Art

[0002] During the continuous spot welding process, the electrode working surface condition gradually deteriorates with the increase of the number of welds due to the cyclic effects of harsh process environments such as high temperature and high pressure, and the negative impact on the quality of welds and the cost of spot welding process gradually increases. In order to reduce the negative impact caused by excessive changes in the working surface condition of the electrode, the production adopts the method of regular grinding of the working end of the electrode, in order to limit the diameter and surface condition of the working end of the electrode within a certain fluctuation range through preventive measures, so as to achieve the purpose of limiting the discreteness of the weld quality within an acceptable range.

[0003] The electrode grinder is mainly intended to achieve the following purposes: first, to restore the enlarged working diameter of the electrode surface to its initial set value, creating necessary conditions for controlling the diameter of the weld core; second, to remove the newly formed oxide layer formed on the working surface of the electrode during the previous spot welding process, creating necessary conditions for improving the quality of the weld and reducing the cost of the spot welding process; third, to ensure that the working surfaces of the two electrodes after grinding are parallel to the workpiece surface during the spot welding operation, to increase the effective contact area and power feeding capacity between the working surface of the electrode and the workpiece surface, creating necessary conditions for improving the quality of the weld and reducing the cost of the spot welding process.

[0004] The electrode automatic dresser of the known technology mainly has the following shortcomings:

[0005] (1) The grinding principles of the known automatic electrode grinders are similar and have the following common properties: First, since the outer contour of the cutting edge section of the cutting tool that is ground or shaped on the electrode working surface is an arc, the initial state of the electrode working surface after grinding is an arc surface with the same curvature radius as the cutting edge of the cutting tool, which greatly reduces the contact ratio between the electrode working surface and the workpiece surface and the actual power feeding capacity, promotes the accelerated formation of oxides on the electrode working surface, and directly has a negative impact on the quality assurance of the weld spot; second, they do not have the ability to compensate for the deflection of the electrode working surface caused by the flexural deformation of the welding clamp arm and the inclination of the electrode grip during spot welding. During continuous spot welding, it has a continuous negative impact on the power feeding capacity of the electrode working surface and the quality assurance of the weld spot.

[0006] (2) When the electrode is ground or shaped, the essence of the grinding of the cutting tool edge on the electrode surface is either scraping or the combined effect of extrusion and scraping. Sufficient pressure must be provided to the cutting tool edge to achieve the purpose of scraping or shaping, and the working life of the cutting tool is limited. The scraping force or shaping force of the cutting tool edge on the electrode is jointly established by the electrode pressure and the cutting tool rotation torque. The scraping force or shaping force and the amount of grinding each time are positively correlated with the bluntness of the cutting edge. If it is intended to ensure that the newly formed layer on the electrode surface can be effectively removed during each grinding, the unnecessary cutting amount must be set large enough. Summary of the invention

[0007] In view of the above-mentioned problems existing in the prior art, the main purpose of the present invention is to provide an automatic grinder for resistance spot welding electrodes, which can realize the automatic grinding of the electrodes on both sides of the machine arms of various types of resistance spot welding automatic welding tongs at the same time. In addition to making the working surface state of the ground electrode consistent with the process requirements during spot welding, it also has corresponding compensation capabilities for the deflection angle generated by the electrode gripper during spot welding; in addition, the grinding tool should have a long working life.

[0008] The technical solution of the present invention is as follows:

[0009] An automatic grinder for resistance spot welding electrodes, comprising a closed shell composed of a left shell and a right shell with a mirror image relationship in appearance, a main part of a mechanical structure for realizing electrode grinding, cutting displacement control, electrode grinding angle compensation and cutting tool axial vibration suppression functions is placed inside the closed shell; a device follow-up swing mechanism for balancing cutting stresses on both sides during electrode grinding is fixedly mounted on a power motor mounting seat and the rear surface of the right shell; a negative pressure generator for realizing instant discharge of chips generated during electrode grinding from an electrode grinding chamber is fixedly mounted on an equipment bracket; during electrode grinding, the main part of the mechanical structure, the device follow-up swing mechanism and the negative pressure chip suction system are used to synchronously complete the grinding of the electrode working ends on the arm grips on both sides of the welding clamp by using the coordinated cooperation between the main part of the mechanical structure, the device follow-up swing mechanism and the negative pressure chip suction system, wherein:

[0010] The motor grinding mechanism comprises a grinding power drive device and two sets of electrode grinding devices, the two sets of electrode grinding devices are coaxially arranged on both sides of the closed shell, the grinding power drive device comprises a power motor, a power motor mounting seat, a power input gear, a power transition gear, a power input gear bearing and a power transition gear bearing; the power motor mounting seat is fixedly mounted on the outer surface of the right shell; the outer rings of the two power input gear bearings and the two power transition gear bearings are respectively fitted into the corresponding bearing holes opened on the right shell and the power motor mounting seat, and the left side journals of the power input gear and the power transition gear are fitted into the inner rings of the two bearings placed in the right shell, and the two gears are meshed with each other; the key is fitted into the keyway opened on the output shaft end of the power motor and the journal of the power input gear, and the power motor is fixedly mounted on the outer surface of the power motor mounting seat with bolts;

[0011] The electrode grinding device is used to respectively undertake the grinding of the working ends of the electrodes on both sides; the electrode grinding device comprises a left shell, a right shell, a revolving gear, a left-turning cover, a right-turning cover, a limit block, a revolving bearing, a combined cutting tool, a fixed gear ring, a tooth guard, a limit sleeve, an oil-free gasket, bolts and screws; the outer rings of the two revolving bearings are respectively fitted into the corresponding sinks on the outer surfaces of the left shell and the right shell; the two sealing plates are respectively installed in the corresponding sinks on the inner sides of the left shell and the right shell, and each is fixed to the left shell and the right shell respectively with a plurality of screws; the outer circle of the fixed gear ring is fitted into the corresponding sink on the inner side of the left shell, and the fixed gear ring is fixed to the sink on the inner side of the left shell with a plurality of bolts; the two limit blocks are respectively fitted into the sinks on the outer surfaces of the left-turning cover and the right-turning cover, and each is fixed to the left-turning cover and the right-turning cover respectively with a plurality of screws, and at the same time, a limit top screw is screwed into the threaded hole on the side of each screw;

[0012] After the inner hole of the revolving gear is tightly fitted into the corresponding recessed platform on the outer circle of the right-turning cover, the tooth guard plate is fixedly installed in the corresponding recessed platform on the outer surface of the revolving gear with multiple screws; the outer circle of the right-turning cover in the right-turning cover assembly is tightly fitted into the inner circle of the revolving bearing installed in the right shell body; the ball bearing at the end of the shaft of the assembled combination cutting tool is fitted into the corresponding recessed platform on the limit block from the inner side of the right shell body; the left shell body and the right shell body are closed, and the following assemblies are completed in succession: the left shell body and the right shell body are fastened with multiple bolts; the outer circle of the left-turning cover is fitted into the inner hole of the revolving bearing on the left shell body. During the process, the recessed platform hole on the inner side of the limit block is fitted with the outer circle of the ball bearing at the end of the shaft on the other side of the combination cutting tool; the left-turning cover and the right-turning cover are fixedly connected with multiple bolts.

[0013] The main part of the mechanical structure also includes a cutting displacement control mechanism, which is responsible for the cutting displacement control and electrode grinding angle compensation during the grinding of the working ends of the electrodes on both sides; the cutting displacement control mechanism includes a power drive system placed in the closed shell and a cutting displacement control device connected inside and outside the closed shell; the power drive system includes a stepper motor, a reducer, a displacement power input gear, a displacement power transition gear, a synchronous gear, a displacement power input gear bearing, and a displacement transition gear bearing; the cutting displacement control device includes two groups of positive and negative ball thread working pairs composed of two groups of positive and negative ball thread shafts and positive and negative ball thread sleeves, a displacement adjustment gear, a displacement adjustment gear bearing and two groups of support plate assemblies.

[0014] Two sets of displacement power input gear bearings and displacement power transition gear bearings are respectively installed in the corresponding bearing holes on the left housing and the right housing, and one side journal of the displacement power input gear and the displacement power transition gear is respectively inserted into the inner ring of the displacement power input gear bearing and the displacement power transition gear bearing in the right housing, and the two gears are in a meshing state.

[0015] Install the four sets of displacement adjustment gear bearings into the corresponding bearing holes on the left housing and the right housing respectively, and after engaging the two forward and reverse ball threaded shafts and the two displacement adjustment gears with keys, insert the right side journal ends of the two forward and reverse ball threaded shafts into the inner ring of the displacement adjustment gear bearing on the right housing; fit the inner hole clearance of the synchronous gear on the outer circle of the fixed gear ring, and make the synchronous gear mesh with the displacement adjustment gear; while closing the left housing and the right housing, insert the displacement power input gear, the displacement power transition gear and the left side journals of the forward and reverse ball threaded shafts into the corresponding inner rings of the bearings.

[0016] The invention also comprises a set of combined cutting tools, which comprises a self-rotating gear, a plane cutting tool, two sets of arc-surface cutting tools or two sets of truncated cone-shaped cutting tools, a cutter shaft, two rolling bearings, two disc springs, a needle roller bearing and a pin; the outer circle of the plane cutting tool is tightly fitted and axially symmetrically embedded in the inner hole of the self-rotating gear; two arc-surface cutting tools, which are respectively left-handed and right-handed, are placed in the grooves on both sides of the plane cutting tool, and three pins are installed in three corresponding pin holes existing in all three to establish a torsional engagement relationship among the three; the outer circle of the needle roller bearing is tightly fitted and axially symmetrically embedded in the inner hole of the self-rotating gear; two arc-surface cutting tools, which are left-handed and right-handed, are placed in the grooves on both sides of the plane cutting tool; three pins are installed in three corresponding pin holes existing in all three to establish a torsional engagement relationship among the three; After the circle is fitted into the inner holes of the two arc-surface cutting tools, the cutter shaft is fitted into the inner ring of the needle bearing; after a disc spring is installed on each axial side of the cutter shaft, a rolling bearing is fitted on each outer side of the disc spring; after the combined cutting tool is installed in the closed shell, the axial pre-pressure of the disc springs on the arc-surface cutting tool on the arc-surface cutting tool is adjusted by adjusting the screw-in depth of the four limit screws evenly distributed on the positioning block, so as to restrain the axial vibration that may be generated by the cutting reaction force when the flat cutting tool and the arc-surface cutting tool are grinding the electrode.

[0017] The outer structure of the flat cutting tool is a thin-walled circular ring with symmetrical convex rings on both axial sides of the outer circumference, and a through hole is axially opened in the center of the flat cutting tool to form a clearance fit with the outer diameter of the needle bearing; the surfaces of the convex rings on both axial sides are planes parallel to each other, and positive and negative rotation cutting edges are opened on their surfaces respectively; in the inner groove of the axial convex ring, three through pin holes are symmetrically opened corresponding to the positions of the three pin holes opened on the bottom surface of the arc cutting tool; when the electrode is ground, the rotation planes of the cutting edges on both sides of the flat cutting tool are always in contact with the working end planes of the electrodes to be ground on both sides, and only undertake the milling and grinding of the working end planes of the electrodes on both sides.

[0018] The cutting displacement control mechanism also includes two sets of support plate assemblies, each set of the support plate assemblies is composed of a support plate, an oil-free gasket, a limit sleeve, a limit plate and a bolt; the two oil-free gaskets are respectively fitted into the corresponding countersunk holes on the inner sides of the two support plates, and a limit sleeve is inserted through the inner holes of the two oil-free gaskets respectively; a limit plate is fastened and installed on the upper part of the limit sleeve with two bolts; the positive and negative ball nut holes on both sides of the two sets of assembled support plate assemblies are respectively fitted on the outer diameters of the positive and negative ball nuts in the ball nut screw pairs on both sides of the closed shell, and the relative position of the support plate assembly between the closed shells is locked with a top screw.

[0019] During operation, the spherical positioning holes at the bottom of the inner sides of the positioning sleeves on both sides are responsible for the axial and radial positioning of the electrodes to be ground on both sides respectively. The rectangular part of the lower structure is in a micro-gap fit with the positioning sleeve insertion holes on the left-turn cover and the right-turn cover, and the two positioning sleeves rotate synchronously with the left-turn cover and the right-turn cover respectively, and the oil-free gasket plays a friction-reducing role in the rotation of the positioning sleeves. After assembly is completed, the stepper motor and its reducer are installed on the outer surface of the right housing by keys and bolts.

[0020] It also includes a set of equipment follow-up swing mechanism, which is fixedly installed on the power motor mounting seat and the rear surface of the outer side of the right shell through a connecting plate. The equipment follow-up swing mechanism includes a connecting plate, a support, a sliding working pair composed of two groups of linear bearings and a light bar, a mounting plate, a spring and a bolt; the connecting plate is fixedly installed on the power motor mounting seat and the outer rear surface of the right shell; after the two supports are fixedly installed on both sides of the connecting plate, the two light bars are passed from the outside through the corresponding holes on one side of the support, and then the springs and linear bearings are respectively installed on the two light bars in sequence, and then after passing through the corresponding holes on the other side of the support, the two groups of parts respectively installed on the two light bars are locked between the supports on both sides with two retaining springs; the mounting plate and the linear bearing are fastened with bolts.

[0021] It also includes a negative pressure chip suction system, which includes a negative pressure channel, a negative pressure generator and a negative pressure pipeline mirror-opened on the inner surfaces of the left shell and the right shell respectively; the negative pressure channels mirror-opened on the inner surfaces of the left shell and the right shell respectively become tubular channels after the left shell and the right shell are closed, and the inner hole of the tubular channel is connected to the negative pressure generator through the negative pressure pipeline, and is connected to the chip removal duct through the negative pressure generator; the negative pressure generator is fixedly installed on the equipment bracket; the grinding chips instantly sucked out by negative pressure pass through the negative pressure channel, negative pressure pipeline and negative pressure generator in the closed shell, and then are led to the chip collection tank specified by the user through the chip removal duct.

[0022] The present invention has the following advantages and beneficial effects:

[0023] (1) The multi-edge combination cutting tool uses milling to grind the electrode, which requires a smaller electrode grinding pressure. Compared with the known method of grinding the electrode by scraping with electrode pressure, the cutting tool edge load is sharply reduced, which can greatly improve the service life of the cutting tool.

[0024] (2) The multi-blade combination cutting tool uses a revolution + high-speed rotation method to grind the electrode, and only performs positioning and micro-milling grinding on the newly formed layer on the working surface of the electrode, which can greatly reduce the unnecessary grinding amount in the known technology.

[0025] (3) Since the working surface of the electrode after grinding is flat and the equipment has the function of automatic compensation of the electrode grinding angle, it can ensure the good instant adhesion effect between the working plane of the electrode and the workpiece surface during spot welding, improve the power feeding capacity of the working surface of the electrode, and create the necessary conditions for improving the quality of welds and reducing the cost of spot welding process. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A schematic diagram of the three-dimensional structure of an automatic grinder for resistance spot welding electrodes provided in an embodiment of the present invention;

[0027] Figure 2 A right side structural schematic diagram of an automatic grinding device for resistance spot welding electrodes provided in an embodiment of the present invention;

[0028] Figure 3 A schematic diagram of the right side structure of the automatic grinding device for resistance spot welding electrodes provided by an embodiment of the present invention without a support plate assembly;

[0029] Figure 4 for Figure 2 Schematic diagram of the cross-sectional structure in the AA direction when there is no swing mechanism;

[0030] Figure 5 for Figure 2 Schematic diagram of the cross-sectional structure in the BB direction when there is no swing mechanism;

[0031] Figure 6 for Figure 2 Schematic diagram of the cross-sectional structure in CC direction when there is no swing mechanism;

[0032] Figure 7 A schematic diagram of the axial cross-sectional structure of a combined cutting tool provided by an embodiment of the present invention;

[0033] Figure 8 A schematic diagram of the top view of the planar cutting tool provided by an embodiment of the present invention;

[0034] Fig. 9 A schematic diagram of an axial cross-sectional structure of a planar cutting tool provided by an embodiment of the present invention;

[0035] Fig.10 A schematic diagram of the top view of the curved cutting tool provided by an embodiment of the present invention;

[0036] Fig.11 for Fig.10 Schematic diagram of the cross-sectional structure in the middle DD direction;

[0037] Fig.12 A schematic diagram of the top view of a truncated cone-shaped cutting tool provided in an embodiment of the present invention;

[0038] Fig.13 A schematic diagram of the axial cross-sectional structure of a truncated cone-shaped cutting tool provided in an embodiment of the present invention;

[0039] Fig.14 A schematic diagram of the top view structure of a support plate assembly provided in an embodiment of the present invention;

[0040] Fig.15 A schematic diagram of an axial cross-sectional structure of a support plate assembly provided in an embodiment of the present invention;

[0041] Fig.16 An enlarged three-dimensional structural schematic diagram of a left housing provided in an embodiment of the present invention;

[0042] Fig.17 An enlarged three-dimensional structural schematic diagram of the right housing provided by an embodiment of the present invention;

[0043] Fig.18 An enlarged three-dimensional structural schematic diagram of a left-turnable cover in one direction provided by an embodiment of the present invention;

[0044] Fig.19 An enlarged three-dimensional structural schematic diagram of a right-turnable cover in one direction provided by an embodiment of the present invention;

[0045] Fig. 20 An enlarged three-dimensional structural schematic diagram of a left-turnable cover in another direction provided by an embodiment of the present invention;

[0046] Fig.21An enlarged three-dimensional structural schematic diagram of a right-turnable cover in another direction provided by an embodiment of the present invention;

[0047] Fig. 22 A schematic diagram of an enlarged three-dimensional structure of a limit block in one direction provided by an embodiment of the present invention;

[0048] Fig.23 A schematic diagram of an enlarged three-dimensional structure of a limit block in another direction provided by an embodiment of the present invention;

[0049] Fig.24 An enlarged top view of the ball thread sleeve provided in an embodiment of the present invention

[0050] Fig.25 An enlarged axial cross-sectional structural schematic diagram of a ball thread sleeve provided in an embodiment of the present invention;

[0051] Fig.26 An enlarged front structural schematic diagram of a curved surface electrode provided in an embodiment of the present invention;

[0052] Fig. 27 This is an enlarged front structural schematic diagram of a truncated cone-shaped electrode provided in an embodiment of the present invention.

[0053] The following are marked in the figure:

[0054] 1-positive and negative ball nut, 2-positive and negative ball threaded shaft, 3-top screw, 4-left housing;

[0055] 5-support plate, 6-first bolt, 7-right housing, 8-reducer, 9-stepping motor;

[0056] 10-power motor mounting seat, 11-power motor, 12-connecting plate, 13-linear bearing;

[0057] 14-first support, 15-spring, 16-mounting plate, 17-second bolt, 18-light bar, 19-second support; 20-third bolt, 21-limiting plate, 22-limiting top screw, 23-fourth bolt, 24-fifth bolt; 25-limiting plate; 26-positioning hole, 27-limiting sleeve, 28-left turn cover, 29-autorotation gear;

[0058] 30- plane cutting tool; 31- arc cutting tool, 32- sealing plate, 33- pin, 34- disc spring;

[0059] 35-rolling bearing; 36-needle bearing, 37-oil-free gasket, 38-revolution bearing, 39-fixed gear ring; 40-power transition gear bearing, 41-power transition gear, 42-power input gear;

[0060] 43-power input gear bearing, 44-revolution gear, 45-knife shaft, 46-right rotation cover;

[0061] 47-tooth guard, 48-first screw, 49-second screw, 50-synchronous gear, 51-third screw; 52-displacement adjustment gear bearing, 53-displacement adjustment gear, 54-displacement power transition gear; 55-displacement power transition gear bearing, 56-displacement power input gear bearing;

[0062] 57-displacement power input gear, 58-truncated cone-shaped cutting tool, 59-sixth bolt, 60-negative pressure channel; 61-torsion notch, 62-cambered electrode, 63-truncated cone-shaped electrode, 641-first plane;

[0063] 642 - second plane, 651 - first side surface, 652 - second side surface. DETAILED DESCRIPTION

[0064] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. The components of the embodiments of the present invention generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0065] The present invention relates to an automatic grinding device for electrode caps on the electrode gripping rods of the machine arms on both sides of the automatic welding clamp during the resistance spot welding process. The automatic electrode grinder of the present invention uses a multi-edge combined cutting tool to grind the electrode in a milling manner of revolution + high-speed rotation and under a small electrode pressure during the electrode grinding process, and the surface of the electrode working end after grinding is a plane; the positioning and shifting cutting mechanism is used to control the grinding amount of the electrode each time it is ground, and the electrode working plane deflection caused by the bending deformation of the welding clamp machine arm has an angle compensation function, and the axial vibration of the cutting tool during the grinding process is suppressed by presetting the axial pressure of the cutting tool, so that the precise control of the electrode grinding amount each time can be achieved, and the unnecessary cutting amount can be extremely compressed. The angle change of the electrode working plane can also be dynamically compensated to ensure that the ground electrode working surface is in good contact with the workpiece surface during the spot welding process. The above-mentioned working characteristics of the present invention jointly determine the characteristics of long working life of the cutting tool, high effective utilization rate of electrode materials and good feeding effect of the ground electrode surface during spot welding, which can achieve significant positive effects in reducing the consumption of cutting tools and electrode materials, reducing the number of electrode replacements, reducing the spot welding process cost and improving the quality of welds.

[0066] The inventive concept of the automatic grinding device for resistance spot welding electrodes of the present invention is:

[0067] (1) An electrode grinding method for a multi-edge combined cutting tool is established, which uses revolution + high-speed rotation and micro-cutting positioning and shifting milling under small electrode pressure. The arc surface grinding method of the electrode working end face in the known technology is changed from the grinding principle of scraping or scraping and grinding to the grinding principle of multi-edge plane milling, thereby overcoming the disadvantages of the known electrode grinding technology, such as short tool life, excessive proportion of unnecessary grinding amount of the electrode during each grinding, and low power supply capacity to the welding part.

[0068] (2) The dynamic compensation function of the electrode grinding angle is introduced to significantly reduce the negative impact of the incremental change of the electrode working axis angle on the adhesion state between the electrode working plane and the workpiece surface, creating the necessary conditions for improving the quality of welds and reducing the cost of spot welding processes.

[0069] The technical solution of the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. The described specific embodiments are only used to explain the present invention and are not intended to limit the present invention.

[0070] like Figures 1 to 27 As shown, an automatic grinder for resistance spot welding electrodes provided by an embodiment of the present invention comprises a closed shell composed of a left shell 4 and a right shell 7 which are mirror images in appearance, and the main parts of the mechanical structure for realizing the functions of electrode grinding, cutting displacement control, electrode grinding angle compensation and cutting tool axial vibration suppression for the purposes of the present invention are all placed in the closed shell; a device follower swing mechanism for balancing the cutting stress on both sides during the electrode grinding process is fixedly mounted on the rear surface of the power motor mounting seat 10 and the right shell 7; a negative pressure generator for realizing the immediate discharge of chips generated during the electrode grinding from the electrode grinding chamber is fixedly mounted Installed on the equipment bracket; when the electrode is ground, the main part of the mechanical structure, the equipment follow-up swing mechanism, and the negative pressure chip suction system are coordinated to synchronously complete the grinding of the working ends of the electrodes on the arm grips on both sides of the welding clamp, that is, the arc electrode 62 and the truncated cone electrode 63; wherein, the power motor 11, the power motor mounting seat 10, the stepper motor 9 and its reducer 8 assembly, etc. in the mechanism are all fixedly mounted on the outer surface of the right shell 7, and the support plate assemblies in the two sets of cutting displacement control and grinding angle compensation mechanisms are engaged on the positive and negative ball nuts 1 exposed on both side surfaces of the closed shell.

[0071] like Figures 1 to 13 and Figure 16 to Figure 23As shown, the electrode dresser of the present invention includes a set of electrode dressing mechanisms, and the electrode dressing mechanisms include a dressing power drive device and an electrode dressing device; the dressing power drive device of the electrode dressing mechanism includes a power motor 11, a power motor mounting seat 10, a power input gear 42, a power transition gear 41, a power input gear bearing 43 and a power transition gear bearing 40, etc.; the power motor mounting seat 10 is fixedly mounted on the outer surface of the right housing 7; the outer rings of the two power input gear bearings 43 and the two power transition gear bearings 40 are respectively fitted into the right housing 7 and the corresponding bearing holes opened on the power motor mounting seat 10, the left shaft necks of the power input gear 42 and the power transition gear 41 are fitted into the power input gear bearing 43 and the inner ring of the power transition gear bearing 40 placed in the right housing 7, and the power input gear 42 and the power transition gear 41 are meshed with each other; after a key not shown in the figure is used to fit into the keyway opened on the output shaft end of the power motor 11 and the shaft neck of the power input gear 42, the power motor 11 is fixedly mounted on the outer surface of the power motor mounting seat 10 with bolts.

[0072] like Figures 1 to 13 and Figure 16 to Figure 23As shown, the electrode grinding device of the present invention is responsible for grinding the working ends of the electrodes on the arm grips on both sides of the welding clamp, namely the working ends of the arc electrode 62 and the truncated cone electrode 63; the electrode grinding device includes a revolving gear 44, a left-turning cover 28, a right-turning cover 46, a limit block 21, a revolving bearing 38, a combined cutting tool, a fixed gear ring 39, a tooth guard plate 47, a limit sleeve 27 shared with the support plate assembly, an oil-free gasket 37 and bolts and screws, etc.; the outer rings of the two revolving bearings 38 are respectively matched and installed into the closed shell formed by the left shell 4 and the right shell 7 The two sealing plates 32 are respectively installed in the corresponding sinks on the inner sides of the left housing 4 and the right housing 7, and are fixed to the left housing 4 and the right housing 7 respectively with four second screws 49; the outer circle of the fixed gear ring 39 is fitted into the corresponding sink on the inner side of the left housing 4, and the fixed gear ring 39 is fixed to the sink on the inner side of the left housing 4 with four third screws 51; the two limit blocks 21 are respectively fitted into the sinks on the outer surfaces of the left rotation cover 28 and the right rotation cover 46, and the two limit blocks are fixed with four fourth bolts 23 21 is respectively fixed between the left-turn cover 28 and the right-turn cover 46, and at the same time, a limit screw 22 is screwed into the threaded hole on the side of each fourth bolt 23; after the inner hole of the revolving gear 44 is tightly fitted into the corresponding sink on the outer circle of the right-turn cover 46, the tooth guard plate 47 is fixedly installed in the corresponding sink on the outer surface of the revolving gear 44 with four first screws 48; the outer circle of the right-turn cover 46 in the above-mentioned right-turn cover assembly is tightly fitted into the inner circle of the revolving bearing 38 installed in the right housing 7; the ball bearing at one end of the assembled combined cutting tool is The bearing 35 is fitted into the corresponding sinker on the limit block 21 from the inner side of the right housing 7; the left housing 4 and the right housing 7 are closed, and the following assemblies are completed successively: first, the left housing 4 and the right housing 7 are fastened with six first bolts 6; second, the outer circle of the left-turning cover 28 is fitted into the inner hole of the revolving bearing 38 on the left housing 4. During the process, the sinker hole on the inner side of the limit block 21 is fitted with the outer circle of the ball bearing 35 on the shaft end on the other side of the combined cutting tool; third, the left-turning cover 28 and the right-turning cover 46 are fixedly connected with each other using three third bolts 20.

[0073] like Figure 1 to Figure 6 , Fig.12 , Fig.13 and Fig.24 and Fig.25As shown, the present invention also includes a set of cutting displacement control mechanisms, which are responsible for the cutting displacement control and electrode grinding angle compensation work when grinding the working ends of the electrodes on both sides, namely the first plane 641 of the working end of the arc surface electrode 62 or the second plane 642 of the working end of the truncated cone electrode 63, and the first side surfaces 651 on both sides of the working end of the arc surface electrode 62 or the second side surfaces 652 on both sides of the working end of the truncated cone electrode 63; the cutting displacement control mechanism includes a group of power drive systems placed in the closed shell and a cutting displacement control mechanism connected inside and outside the closed shell; the power drive system of the mechanism includes a stepping motor 9 and its reducer 8, a displacement power input gear 57, a displacement power transition gear 54, a synchronous gear 50, a displacement power input gear bearing 56, a displacement transition gear bearing 55, etc.; the cutting displacement control mechanism includes two groups of positive and negative ball thread working pairs composed of two groups of positive and negative ball thread shafts 2 and positive and negative ball thread sleeves 1, a displacement adjustment gear 53, a displacement adjustment gear bearing 52 and two groups of support plate assemblies, etc.; the displacement power input gear bearing 56, the displacement power transition gear 54, the synchronous gear 50, the displacement power input gear bearing 56, the displacement power transition gear bearing 55, etc. Two sets of gear bearings 55 are respectively fitted into the corresponding bearing holes on the left housing 4 and the right housing 7, and the one side journals of the displacement power input gear 57 and the displacement power transition gear 54 are respectively inserted into the inner rings of the displacement power input gear bearing 56 and the displacement power transition gear bearing 55 in the right housing 7, and the two gears, namely the displacement power input gear 57 and the displacement power transition gear 54, are in a meshing state; four sets of displacement adjustment gear bearings 52 are respectively fitted into the corresponding bearing holes on the left housing 4 and the right housing 7, and are used as shown in the figure. After the unshown key engages the two forward and reverse ball thread shafts 2 with the two displacement adjustment gears 53, the right side shaft neck ends of the two forward and reverse ball thread shafts 2 are inserted into the inner ring of the displacement adjustment gear bearing 52 on the right housing 7; the inner hole clearance of the synchronous gear 50 is fitted on the outer circle of the fixed gear ring 39, and the synchronous gear 50 is meshed with the displacement adjustment gear 52; while closing the left housing 4 and the right housing 7, the displacement power input gear 56, the displacement power transition gear 55 and the left side shaft necks of the forward and reverse ball thread shafts 2 are inserted into the corresponding bearing inner rings.

[0074] like Figure 7 to Figure 13As shown, the combined cutting tool of the present invention comprises a self-rotating gear 29, a plane cutting tool 30, two sets of arc-surface cutting tools 31 or two sets of truncated cone-shaped cutting tools 58, a cutter shaft 45, two rolling bearings 35, two disc springs 34, a needle bearing 36 and three pins 33, etc.; the outer circle of the plane cutting tool 30 is tightly fitted and axially symmetrically embedded in the inner hole of the self-rotating gear 29; two arc-surface cutting tools 31, which are respectively left-handed and right-handed, are placed in the grooves on both sides of the plane cutting tool 30, and three pins 33 are fitted into the three corresponding pin holes 33 existing in all three, so as to establish a torsional engagement relationship between the three; after the outer circle of the needle bearing 36 is fitted into the inner holes of the two arc-surface cutting tools 31, the cutter shaft 45 is fitted into the inner ring of the needle bearing 36; after a disc spring 34 is installed on each axial side of the above-mentioned combination, a rolling bearing 35 is fitted on each outer side of the disc spring. After the combined cutting tool is installed in the closed shell, the axial pre-pressure of the disc springs 34 on the curved cutting tool 31 on the curved cutting tool 31 can be adjusted by the screwing depth of the four limit screws 22 evenly distributed on the positioning block 21, so as to restrain the axial vibration of the flat cutting tool 30 and the curved cutting tool 31 caused by the cutting reaction force when grinding the electrode.

[0075] like Figure 8 and Fig. 9 As shown, the outer structure of the planar cutting tool 30 is a thin-walled circular ring with symmetrical convex rings on both axial sides of the outer circumference, and a through hole is axially opened in the center of the planar cutting tool 30 to form a clearance fit with the outer diameter of the needle bearing 36; the surfaces of the convex rings on both axial sides are planes parallel to each other, and positive and negative rotation cutting edges are opened on their surfaces respectively; in the inner groove of the axial convex ring, three through pin holes 33 corresponding to the positions of the three pin holes 33 opened on the bottom surface of the arc cutting tool 31 are symmetrically opened; when the arc electrode 62 or the truncated cone electrode 63 is ground, the rotation planes of the cutting edges on both sides of the planar cutting tool 30 are always in contact with the working end planes of the arc electrode 62 or the truncated cone electrode 63 to be ground on both sides, and only undertake the milling and grinding of the first plane 641 of the working end of the arc electrode 62 or the second plane 642 of the working end of the truncated cone electrode 63.

[0076] like Figure 10 to Figure 13As shown, the name of the arc surface cutting tool 31 or the truncated cone cutting tool 58 is derived from the outer contour shape of the cutting edge in the axial section of the two cutting tools, namely the arc surface cutting tool 31 or the truncated cone cutting tool 58. The electrodes used in production mainly include two types: the arc surface electrode 62 and the truncated cone electrode 63. The selection of the arc surface cutting tool 31 or the truncated cone cutting tool 58 in the combined cutting tool is determined by the user's requirements for the side shape of the working end of the electrode. The arc radius R of the cutting edge of the arc surface cutting tool 31 is equal to the arc radius R of the side of the arc surface electrode 62 to be ground, and the specific size is determined by the user's requirements for the surface shape of the electrode after grinding. The cone angle α of the truncated cone cutting tool 58 is also determined by the user's requirements for the surface shape of the electrode after grinding. shape requirements; when the combined cutting tool is assembled, the cutting edge rotation direction of the arc cutting tools 31 or the truncated cone cutting tools 58 on both sides must be the same as the cutting edge rotation direction of the same side of the plane cutting tool 31 located in the middle of the cutter shaft 45; when the electrode is ground, the cutting edge of the arc cutting tool 31 or the truncated cone cutting tool 58 is only milled and ground on the first side surface 651 on both sides of the working end of the arc electrode 62 to be ground on both sides or the second side surface 652 on both sides of the working end of the truncated cone electrode 63; the axial center of the arc cutting tool 31 or the truncated cone cutting tool 58 is provided with an axial through hole 36 that matches the outer diameter of the needle bearing 36, and the bottom surface thereof is provided with three pin holes 33 corresponding to the positions of the three pin holes 33 formed on the bottom surface of the groove of the plane cutting tool 30.

[0077] The flat cutting tool 30, the arc cutting tool 31 and the truncated cone cutting tool 58 are essentially forming milling cutters of different shapes, and their cutting edge parameters are the same as the corresponding parameters of similar milling cutters; the number of teeth n1, n2 or n3 processed on the cutting tool is determined by the cutting tool diameter, and when the diameter of the arc electrode 62 or the truncated cone electrode 63 increases, the diameter and the number of cutting edges of each cutting tool also increase accordingly.

[0078] like Fig.14 and Fig.15As shown, the cutting displacement control mechanism of the present invention also includes two sets of support plate assemblies; the two sets of support plate assemblies are composed of two identical groups of support plates 5, oil-free gaskets 37, limit sleeves 27, limit plates 25 and fifth bolts 24; the two oil-free gaskets 37 are respectively fitted into the corresponding countersunk holes on the inner sides of the two support plates 5, and the limit sleeves 27 are respectively inserted through the inner holes of the two oil-free gaskets 37; and a limit plate 25 is fastened and installed on the plane of the support plate 5 above the limit sleeves 27 with two fifth bolts 24. The positive and negative ball nut holes 1 on both sides of the two assembled support plate assemblies are respectively fitted on the outer diameters of the positive and negative ball nuts 1 in the ball nut screw pairs on both sides of the closed housing, and the relative position of the support plate assembly between the closed housings 4 and 7 is locked with the top screw 3. When the equipment is working, the spherical positioning holes 26 at the inner bottom of the positioning sleeves 27 on both sides are responsible for the axial and radial positioning of the arc surface electrodes 62 or the truncated cone electrodes 63 to be ground on both sides, and the rectangular portion of the lower outer contour is in a micro-gap fit with the positioning sleeve insertion holes 27 on the left-turning cover 28 and the right-turning cover 46. When working, the two positioning sleeves 27 rotate synchronously with the left-turning cover 28 and the right-turning cover 46, respectively, and the oil-free gasket 37 plays a friction-reducing role in the rotation of the positioning sleeves 27; after completing the above assembly, the stepper motor 9 and its reducer 8 are installed on the outer surface of the right housing 7 by keys and bolts not shown in the figure.

[0079] like Figure 1 to Figure 3 As shown, the present invention also includes a set of equipment follow-up swing mechanism, which is fixedly installed on the rear surface of the outer side of the power motor mounting seat 10 and the right housing 7 through a connecting plate 12, including a connecting plate 12, a first support 14 and a second support 19, a sliding working pair composed of two sets of linear bearings 13 and a light bar 18, a mounting plate 16, a spring 15 and a second bolt 17, etc.; the connecting plate 12 is fixedly installed on the outer rear surface of the power motor mounting seat 10 and the right housing 7; the two are fixedly installed with four bolts not shown in the figure. After the first support 14 and the second support 19 are fixedly installed on both sides of the connecting plate 12, the two optical rods 18 are passed from the outside through the corresponding holes on the support 14 on one side, and then the springs 15 and the linear bearings 13 are respectively installed on the two optical rods 18 in sequence. After passing through the corresponding holes on the support 19 on the other side, the two sets of parts respectively installed on the two optical rods 18 are locked between the first support 14 and the second support 19 on both sides by two retaining springs not shown in the figure; the mounting plate 16 and the linear bearing 13 are fastened and connected by the second bolt 17.

[0080] like Figure 16 to Figure 17As shown, the present invention also includes a set of negative pressure chip suction system, which includes a negative pressure channel 60, a negative pressure generator and a negative pressure pipeline, etc.; the negative pressure channel 60 is mirror-symmetrically opened on the inner surface of the left shell 4 and the right shell 7, respectively. After the left shell 4 and the right shell 7 are closed, the inner hole of the negative pressure channel is connected to the negative pressure generator through a negative pressure pipeline not shown in the figure, and is connected to the chip removal duct through the negative pressure generator. The negative pressure generator is a commercially available standard part and is fixedly installed on the equipment bracket; the grinding chips sucked out by negative pressure are passed through the negative pressure channel 60, the negative pressure pipeline and the negative pressure generator in the closed shell, and then led to the chip collection tank specified by the user through the chip removal duct.

[0081] like Figure 16 to Figure 17 As shown, the axial contours of the left housing 4 and the right housing 7 are in a mirror-image relationship; except for the mounting holes of the power input gear bearing 43 and the power transition gear bearing 40 which only exist on the right housing 7, the other process holes in the left housing 4 and the right housing 7 are in a mirror-image relationship.

[0082] like Figure 16 to Figure 17 As shown, due to the independent assembly relationship between the left-turn cover 28 and the revolving gear 46 described in the present invention and the need for an additional tooth guard plate 47 on the outside of the revolving gear 43, except that the right-turn cover 46 is additionally provided with 4 bolts not shown in the figure when assembling the revolving gear 43 and the right-turn cover 46 and a diameter slightly smaller than the left-turn cover 28, the other process holes and assembly sinks are in a mirror relationship.

[0083] Figure 26 to Figure 27 Shown are the front appearance views of two types of standard electrode caps used in production, including a curved electrode 62 and a truncated cone electrode 63. The selection of the curved cutting tool 31 and the truncated cone cutting tool 58 in the automatic electrode grinder of the present invention is determined by the appearance requirements of the first side surface 651 on both sides of the working end of the curved electrode 62 or the second side surface 652 on both sides of the working end of the truncated cone electrode 63 used at the production site.

[0084] The working process of the electrode dresser of the present invention is as follows:

[0085] When the welding tongs carrying the arc surface electrode 62 or the truncated cone electrode 63 to be ground are inserted into the electrode grinding position in the limiting sleeve 27 of the electrode grinding device of the present invention, under the action of the electrode grinding pressure, the first side surfaces 651 on both sides of the working end of the arc surface electrode 62 or the second side surfaces 652 on both sides of the working end of the truncated cone electrode 63 are contacted and positioned with the surface of the positioning holes 26 on the inner bottom of the positioning sleeve 27 on the support plates 5 on both sides of the cutting displacement mechanism in the axial and radial directions respectively; after the grinding device receives the in-position instruction of the arc surface electrode 62 or the truncated cone electrode 63 from the robot, the power motor 11 of the electrode grinding mechanism is started, and the rotating power is transmitted through the power input gear 42 and the power transition gear 41. transmitted to the revolving gear 44; when the revolving gear 44 rotates, the right-turning cover 46 rotates synchronously with the revolving gear 44, and drives the left-turning cover 28 to rotate synchronously through the third bolt 20, and also drives the combined cutting tool placed between the left-turning cover 28 and the right-turning cover 46 to rotate synchronously with the revolving gear 46, that is, the revolving of the cutting tool in the present invention; since the self-rotating gear 29 in the combined cutting tool is meshed with the fixed gear ring 39 at the same time, the combined cutting tool will rotate at a higher speed with the knife shaft 45 as the axis according to the tooth ratio relationship between the fixed gear ring 39 and the self-rotating gear 29, thereby forming the working characteristics of the combined cutting tool in the automatic electrode grinder of the present invention during the electrode grinding process.

[0086] After the power motor 11 reaches the working speed, the stepper motor 9 starts; the output shaft end of the stepper motor 9 passes through the reducer 8, the displacement power input gear 57, the displacement power transition gear 54 and the synchronous gear 50, and then synchronously transmits the rotational power to the two displacement adjustment gears 53 that are arranged on both sides of the synchronous gear 50 and meshed with it, and drives the two positive and negative ball thread shafts 2 to rotate synchronously through a key not shown in the figure; during the synchronous rotation of the two positive and negative ball thread shafts 2, the two pairs of ball thread sleeves 1 with positive and negative threads on the shaft ends on both sides can only move in a straight line at a constant speed towards each other along the axial direction of the two positive and negative ball thread shafts 2, and drive the support plates on both sides. 5 move synchronously towards each other, and at the same time, the arc surface electrodes 62 or truncated cone electrodes 63 to be ground on both sides are gradually fitted with the cutting edges of the combined cutting tools by the positioning sleeves 27 on the supporting plates 5 on both sides, and the working ends of the arc surface electrodes 62 or truncated cone electrodes 63 are ground; the rotation speed of the stepping motor 9 determines the axial feeding speed of the arc surface electrodes 62 or truncated cone electrodes 63 to be ground, that is, the milling and grinding speed during the electrode grinding process; when the milling and grinding displacement reaches the preset value of the stepping motor 9, it indicates that the grinding amount of the electrode 62 or 63 has met the process requirements, and the stepping motor 9 stops working immediately and waits for the next electrode grinding instruction in situ.

[0087] When the arc surface electrode 62 or the truncated cone electrode 63 is slowly fed into the grinding process, there is always a dynamically changing inclination angle between the axis of the arc surface electrode 62 or the truncated cone electrode 63 on both sides and the axis of the electrode positioning hole 26 on the two positioning sleeves 27 of the grinder, and in most cases, the inclination angles on both sides are not consistent, resulting in different cutting stresses when the grinding electrodes on both sides are ground; when different cutting stresses appear on both sides, the follow-up swing mechanism of the equipment will drive the working end of the electrode grinder to swing slightly in the direction of the stress gradient in real time to balance the cutting stresses of the electrodes on both sides during cutting and grinding.

[0088] The electrode grinding angle compensation function is simultaneously completed by using the cutting displacement control function mechanism: when the support plates 5 disposed on both sides of the closed shell move toward each other axially along the positive and negative ball thread shafts 2 to grind the electrode, the inclination angle of the electrode gripping rod will inevitably change. Another compensation function of the electrode grinding angle is to use the program controllability of the stepping motor 9 to form a logical correspondence between the incremental axial displacement of the electrode during the electrode grinding process and the incremental change in the axial inclination angle of the electrode, thereby achieving the purpose of synchronously realizing the incremental compensation of the electrode grinding angle during the positioning and shifting cutting process.

[0089] The negative pressure generator and the power motor 11 work according to the same control instruction; the chamber surrounded by the inner surface of the left-turning cover 28 and the right-turning cover 46 and the inner surface of the fixed gear ring 39 is the electrode grinding chamber, which is communicated with the negative pressure channel 60 respectively opened on the inner side of the left shell 4 and the right shell 7. The chips generated during the electrode grinding can be immediately sucked out through the negative pressure channel 60 to the outside of the closed shell formed by the left shell 4 and the right shell 7 of the grinder.

[0090] The outer end faces of the two groups of positive and negative ball threaded sleeves 1 are radially processed with two pairs of torsion notches 61 at a certain angle. The purpose of setting the torsion notches 61 is that when it is necessary to slightly change the grinding amount setting of one side of the electrode, the ball nut 1 on the corresponding side can be slightly rotated on the outer side of the working end using a screwdriver-like tool through the notch, so as to facilitate fine-tuning of the grinding amount setting of each side.

[0091] After the electrode grinding is completed, the arms on both sides of the welding clamp carry the ground arc electrode 62 or truncated cone electrode 63 from both sides according to the control command of the robot, and the robot simultaneously sends a signal command that the arc electrode 62 or truncated cone electrode 63 has left the grinder, and the power motor 11 and the negative pressure generator of the electrode grinding mechanism also stop working at the same time, and wait for the next electrode grinding command. At this point, the electrode grinding mechanism and the positioning and cutting mechanism cooperate to complete a complete electrode grinding cycle.

[0092] When the dresser of the present invention is installed, the electrode dresser is fixedly mounted on the equipment mounting bracket using the mounting plate 16. Since the working heights of various welding tongs when grinding and the posture requirements of the welding tongs when grinding the arc surface electrode 62 and the truncated cone electrode 63 are different at the production site, the equipment mounting bracket needs to be specially configured according to the site requirements, so the electrode dresser mounting bracket and the negative pressure generator fixed thereon are not shown in the drawings of the present invention.

[0093] To summarize, the present invention utilizes small electrode pressure conditions and the electrode grinding method of multi-edge combination cutting tools revolution + high-speed rotation to achieve the grinding of the working end of the arc electrode 62 or the truncated cone electrode 63, overcoming various negative attribute problems caused by the cutting tool structure type and the cutting principle of the cutting tool in the known technology; through the positioning and shifting cutting mechanism, conditions are created for the positioning and shifting cutting and grinding of electrodes by the multi-edge combination cutting tools under the condition of micro-cutting amount, which not only makes the cutting stress of the cutting tool drop sharply, but also extremely compresses the unnecessary grinding amount in the known technology; the electrode grinding angle compensation device and the disc spring stress pre-stressing of the combination cutting tool create guarantee conditions for the grinding quality assurance of the electrode working plane, and also provide real-time guarantee for the attachment state of the electrode working surface and the workpiece surface during spot welding operation. The implementation of the above-mentioned technical measures has drastically reduced the cutting load on the cutting edge of the cutting tool, greatly improving the service life of the cutting tool and the utilization rate of the electrode material. Under the same process conditions, the real-time guarantee of the contact state between the electrode working plane and the workpiece surface during the spot welding process also provides the basic guarantee conditions for improving the electrode power feeding efficiency, reducing the energy consumption of the spot welding process and ensuring the quality of the welds.

[0094] Finally, it should be noted that the above-described embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some or all of the technical features thereof may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An automatic grinding device for resistance spot welding electrodes, characterized in that: A closed shell body is composed of a left shell body and a right shell body with a mirror image relationship in appearance. The main part of the mechanical structure for realizing electrode grinding, cutting displacement control, electrode grinding angle compensation and cutting tool axial vibration suppression functions is placed inside the closed shell body; the equipment follow-up swing mechanism for balancing the cutting stress on both sides during the electrode grinding process is fixedly installed on the power motor mounting seat and the rear surface of the right shell body; the negative pressure generator for realizing the immediate discharge of the chips generated during the electrode grinding from the electrode grinding chamber is fixedly installed on the equipment bracket; during the electrode grinding, the main part of the mechanical structure, the equipment follow-up swing mechanism, and the negative pressure chip suction system are used to synchronously complete the grinding of the electrode working ends on the arm grips on both sides of the welding clamp by using the coordinated cooperation between the main part of the mechanical structure, the equipment follow-up swing mechanism, and the negative pressure chip suction system. The main part of the mechanical structure includes a motor grinding mechanism, wherein: The motor grinding mechanism comprises a grinding power drive device and two sets of electrode grinding devices, the two sets of electrode grinding devices are coaxially arranged on both sides of the closed shell, the grinding power drive device comprises a power motor, a power motor mounting seat, a power input gear, a power transition gear, a power input gear bearing and a power transition gear bearing; the power motor mounting seat is fixedly mounted on the outer surface of the right shell; the outer rings of the two power input gear bearings and the two power transition gear bearings are respectively fitted into the corresponding bearing holes opened on the right shell and the power motor mounting seat, and the left side journals of the power input gear and the power transition gear are fitted into the two inner rings of the bearings placed in the right shell, and the two gears are meshed with each other; the key is fitted into the keyway opened on the output shaft end of the power motor and the journal of the power input gear, and the power motor is fixedly mounted on the outer surface of the power motor mounting seat with bolts; The electrode grinding device is used to respectively undertake the grinding of the working ends of the electrodes on both sides; the electrode grinding device comprises a left shell, a right shell, a revolving gear, a left-turning cover, a right-turning cover, a limit block, a revolving bearing, a combined cutting tool, a fixed gear ring, a tooth guard, a limit sleeve, an oil-free gasket, bolts and screws; the outer rings of the two revolving bearings are respectively fitted into the corresponding sinks on the outer surfaces of the left shell and the right shell; the two sealing plates are respectively installed in the corresponding sinks on the inner sides of the left shell and the right shell, and each is fixed to the left shell and the right shell respectively with a plurality of screws; the outer circle of the fixed gear ring is fitted into the corresponding sink on the inner side of the left shell, and the fixed gear ring is fixed to the sink on the inner side of the left shell with a plurality of bolts; the two limit blocks are respectively fitted into the sinks on the outer surfaces of the left-turning cover and the right-turning cover, and each is fixed to the left-turning cover and the right-turning cover respectively with a plurality of screws, and at the same time, a limit top screw is screwed into the threaded hole on the side of each screw; After the inner hole of the revolving gear is tightly fitted into the corresponding recessed platform on the outer circle of the right-turning cover, the tooth guard plate is fixedly installed in the corresponding recessed platform on the outer surface of the revolving gear with multiple screws; the outer circle of the right-turning cover in the right-turning cover assembly is tightly fitted into the inner circle of the revolving bearing installed in the right shell body; the ball bearing at the end of the shaft of the assembled combination cutting tool is fitted into the corresponding recessed platform on the limit block from the inner side of the right shell body; the left shell body and the right shell body are closed, and the following assemblies are completed in succession: the left shell body and the right shell body are fastened with multiple bolts; the outer circle of the left-turning cover is fitted into the inner hole of the revolving bearing on the left shell body. During the process, the recessed platform hole on the inner side of the limit block is fitted with the outer circle of the ball bearing at the end of the shaft on the other side of the combination cutting tool; the left-turning cover and the right-turning cover are fixedly connected with multiple bolts.

2. The automatic grinding device for resistance spot welding electrodes according to claim 1, characterized in that: The main part of the mechanical structure also includes a cutting displacement control mechanism, which is responsible for the cutting displacement control and electrode grinding angle compensation during the grinding of the working ends of the electrodes on both sides; the cutting displacement control mechanism includes a power drive system placed in the closed shell and a cutting displacement control device connected inside and outside the closed shell; the power drive system includes a stepper motor, a reducer, a displacement power input gear, a displacement power transition gear, a synchronous gear, a displacement power input gear bearing, and a displacement transition gear bearing; the cutting displacement control device includes two groups of positive and negative ball thread working pairs composed of two groups of positive and negative ball thread shafts and positive and negative ball thread sleeves, a displacement adjustment gear, a displacement adjustment gear bearing and two groups of support plate assemblies.

3. The automatic grinding device for resistance spot welding electrodes according to claim 2, characterized in that: Two sets of displacement power input gear bearings and displacement power transition gear bearings are respectively installed in the corresponding bearing holes on the left housing and the right housing, and one side journal of the displacement power input gear and the displacement power transition gear is respectively inserted into the inner ring of the displacement power input gear bearing and the displacement power transition gear bearing in the right housing, and the two gears are in a meshing state.

4. The automatic grinding device for resistance spot welding electrodes according to claim 3, characterized in that: Install the four sets of displacement adjustment gear bearings into the corresponding bearing holes on the left housing and the right housing respectively, and after engaging the two forward and reverse ball threaded shafts and the two displacement adjustment gears with keys, insert the right side journal ends of the two forward and reverse ball threaded shafts into the inner ring of the displacement adjustment gear bearing on the right housing; fit the inner hole clearance of the synchronous gear on the outer circle of the fixed gear ring, and make the synchronous gear mesh with the displacement adjustment gear; while closing the left housing and the right housing, insert the displacement power input gear, the displacement power transition gear and the left side journals of the forward and reverse ball threaded shafts into the corresponding inner rings of the bearings.

5. The automatic grinding device for resistance spot welding electrodes according to claim 1, characterized in that: The invention also comprises a set of combined cutting tools, which comprises a self-rotating gear, a plane cutting tool, two sets of arc-surface cutting tools or two sets of truncated cone-shaped cutting tools, a cutter shaft, two rolling bearings, two disc springs, a needle roller bearing and a pin; the outer circle of the plane cutting tool is tightly fitted and axially symmetrically embedded in the inner hole of the self-rotating gear; two arc-surface cutting tools, which are respectively left-handed and right-handed, are placed in the grooves on both sides of the plane cutting tool, and three pins are installed in three corresponding pin holes existing in all three to establish a torsional engagement relationship among the three; the outer circle of the needle roller bearing is tightly fitted and axially symmetrically embedded in the inner hole of the self-rotating gear; two arc-surface cutting tools, which are left-handed and right-handed, are placed in the grooves on both sides of the plane cutting tool; three pins are installed in three corresponding pin holes existing in all three to establish a torsional engagement relationship among the three; After the circle is fitted into the inner holes of the two arc-surface cutting tools, the cutter shaft is fitted into the inner ring of the needle bearing; after a disc spring is installed on each axial side of the cutter shaft, a rolling bearing is fitted on each outer side of the disc spring; after the combined cutting tool is installed in the closed shell, the axial pre-pressure of the disc springs on the arc-surface cutting tool on the arc-surface cutting tool is adjusted by adjusting the screw-in depth of the four limit screws evenly distributed on the positioning block, so as to restrain the axial vibration that may be generated by the cutting reaction force when the flat cutting tool and the arc-surface cutting tool are grinding the electrode.

6. The automatic grinding device for resistance spot welding electrodes according to claim 5, characterized in that: The outer structure of the flat cutting tool is a thin-walled circular ring with symmetrical convex rings on both axial sides of the outer circumference, and a through hole is axially opened in the center of the flat cutting tool to form a clearance fit with the outer diameter of the needle bearing; the surfaces of the convex rings on both axial sides are planes parallel to each other, and positive and negative rotation cutting edges are opened on their surfaces respectively; in the inner groove of the axial convex ring, three through pin holes are symmetrically opened corresponding to the positions of the three pin holes opened on the bottom surface of the arc cutting tool; when the electrode is ground, the rotation planes of the cutting edges on both sides of the flat cutting tool are always in contact with the working end planes of the electrodes to be ground on both sides, and only undertake the milling and grinding of the working end planes of the electrodes on both sides.

7. The automatic grinding device for resistance spot welding electrodes according to claim 4, characterized in that: The cutting displacement control mechanism also includes two sets of support plate assemblies, each set of the support plate assemblies is composed of a support plate, an oil-free gasket, a limit sleeve, a limit plate and a bolt; the two oil-free gaskets are respectively fitted into the corresponding countersunk holes on the inner sides of the two support plates, and a limit sleeve is inserted through the inner holes of the two oil-free gaskets respectively; a limit plate is fastened and installed on the upper part of the limit sleeve with two bolts; the positive and negative ball nut holes on both sides of the two sets of assembled support plate assemblies are respectively fitted on the outer diameters of the positive and negative ball nuts in the ball nut screw pairs on both sides of the closed shell, and the relative position of the support plate assembly between the closed shells is locked with a top screw.

8. The automatic grinding device for resistance spot welding electrodes according to claim 7, characterized in that: During operation, the spherical positioning holes at the bottom of the inner sides of the positioning sleeves on both sides are responsible for the axial and radial positioning of the electrodes to be ground on both sides respectively. The rectangular part of the lower structure is in a micro-gap fit with the positioning sleeve insertion holes on the left-turn cover and the right-turn cover, and the two positioning sleeves rotate synchronously with the left-turn cover and the right-turn cover respectively, and the oil-free gasket plays a friction-reducing role in the rotation of the positioning sleeves. After assembly is completed, the stepper motor and its reducer are installed on the outer surface of the right housing by keys and bolts.

9. The automatic grinding device for resistance spot welding electrodes according to claim 1, characterized in that: It also includes a set of equipment follow-up swing mechanism, which is fixedly installed on the power motor mounting seat and the rear surface of the outer side of the right shell through a connecting plate. The equipment follow-up swing mechanism includes a connecting plate, a support, a sliding working pair composed of two groups of linear bearings and a light bar, a mounting plate, a spring and a bolt; the connecting plate is fixedly installed on the power motor mounting seat and the outer rear surface of the right shell; after the two supports are fixedly installed on both sides of the connecting plate, the two light bars are passed from the outside through the corresponding holes on one side of the support, and then the springs and linear bearings are respectively installed on the two light bars in sequence, and then after passing through the corresponding holes on the other side of the support, the two groups of parts respectively installed on the two light bars are locked between the supports on both sides with two retaining springs; the mounting plate and the linear bearing are fastened with bolts.

10. The automatic grinding device for resistance spot welding electrodes according to claim 1, characterized in that: It also includes a negative pressure chip suction system, which includes a negative pressure channel, a negative pressure generator and a negative pressure pipeline mirror-opened on the inner surfaces of the left shell and the right shell respectively; Negative pressure channels are opened on the inner surfaces of the left shell and the right shell in mirror symmetry, and become tubular channels after the left shell and the right shell are closed. The inner hole of the tubular channel is connected to the negative pressure generator through the negative pressure pipeline, and is connected to the chip removal duct through the negative pressure generator; the negative pressure generator is fixedly installed on the equipment bracket; the grinding chips instantly sucked out by the negative pressure pass through the negative pressure channel, negative pressure pipeline and negative pressure generator in the closed shell, and then are led to the chip collection tank specified by the user through the chip removal duct.

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