An automatic grinding device for resistance spot welding electrodes

Abstract

The present invention relates to an automatic grinder for resistance spot welding electrodes, including a closed shell composed of a left shell and a right shell that are mirror images in appearance, and the main parts of the mechanical structure for realizing the functions of electrode grinding, cutting displacement control and grinding angle compensation of the present invention are all placed inside the closed shell. The present invention utilizes a multi-blade combination cutting tool and adopts a revolution + high-speed rotation method to cut and grind the electrode, and the working surface of the electrode after grinding is a plane; the cutting displacement control mechanism positions and shifts the electrode surface to be repaired for micro-cutting and grinding without the help of external force; the electrode grinding angle can be compensated according to the different flexural deformation of the welding clamp arm to ensure full surface contact between the electrode working surface and the workpiece surface during welding. The grinding principle of the present invention can achieve significant positive effects in increasing the service life of the cutting tool, extremely compressing the unnecessary cutting amount of the electrode, improving the quality of the weld spot and reducing the cost of the spot welding process.

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 working surface state of the electrode 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 is gradually increasing. In order to reduce the negative impact caused by excessive changes in the working surface state of the electrode, the production adopts the method of regularly grinding the working end of the electrode, in order to limit the diameter and surface state of the working end of the electrode to 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 diameter of the electrode working 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 electrode working surface 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 two electrode working surfaces 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 electrode working surface 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 a spherical surface with the same curvature radius as the cutting edge of the cutting tool. It is difficult to achieve planar contact between the electrode working surface and the workpiece surface while ensuring the surface quality of the weld, which directly has a negative impact on the actual power feeding capacity of the electrode working surface and the quality assurance of the weld; 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 gripper during spot welding. During continuous spot welding, the power feeding capacity of the electrode working surface and the quality assurance of the weld continue to have a negative impact.

[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 compression 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 fact that both sides of the prior art are ground simultaneously, the present invention provides an automatic grinder for resistance spot welding electrodes, which can grind both sides of the electrodes simultaneously and simultaneously complete functions such as electrode grinding, cutting displacement control and grinding angle compensation.

[0008] In order to solve the above technical problems, the present invention proposes an automatic grinder for resistance spot welding electrodes, including a closed shell composed of a left shell and a right shell with a mirror image relationship in appearance, and the main parts of the mechanical structure for realizing the functions of electrode grinding, cutting displacement control and grinding angle compensation are all placed inside the closed shell; the follow-up swing mechanism for adjusting and balancing the cutting stress on both sides during the electrode grinding process is fixedly installed on the surface of the rear part of the outer side of the closed shell; the negative pressure generator in the negative pressure chip suction system 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, and the negative pressure suction nozzle in the negative pressure chip suction system is fixedly installed on the outer side wall surface of the closed shell; when the electrode is ground, the working ends of the electrodes on the arm grips on both sides of the welding clamp are synchronously ground through the coordinated cooperation between the main part of the mechanical structure, the follow-up swing mechanism, and the negative pressure chip suction system, and the main part of the mechanical structure includes the electrode grinding mechanism, wherein:

[0009] The electrode 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 inside the closed shell, and the grinding power drive device is fixedly arranged on the outer surface of the closed shell to drive the two sets of electrode grinding devices to grind the working ends of the electrodes on the arm grips on both sides of the welding clamp;

[0010] The two sets of electrode grinding devices are coaxially arranged in a closed shell on both sides of the joint surface of the left shell and the right shell, and are responsible for grinding the working ends of the electrodes on both sides during operation. The electrode grinding device includes a revolving gear, a left-turning cover and a right-turning cover, a revolving gear bearing, a combined cutting tool, a fixed gear ring, a limiting sleeve, a first bearing cover, a second bearing cover, a chip separator, and a tooth guard plate; the inner rings of the two revolving gear bearings are respectively tightly fitted into the corresponding annular sinks opened on the inner surfaces of the outer circles of the left-turning cover and the right-turning cover, and the two chip separators are respectively fixed to the inner surfaces of the left-turning cover and the right-turning cover with multiple screws, so as to shield the grinding chips between the two revolving gear bearings and the electrode grinding chamber during electrode grinding; the first bearing cover and the second bearing cover are respectively fixedly installed in the corresponding sinks opened on the outer surfaces of the left-turning cover and the right-turning cover with multiple bolts.

[0011] The grinding power drive device includes a power motor, a power motor mounting seat, a power input gear, a power transition gear, a power input gear bearing, a power transition gear bearing and a first fixed key; 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 housing and the power motor mounting seat.

[0012] Insert the left shaft necks of the power input gear and the power transition gear into the inner rings of the power input gear bearing and the power transition gear bearing placed in the right housing, and make the power input gear and the power transition gear mesh with each other; insert the first fixed key into the keyway provided between the output shaft end of the power motor and the power input gear, and then fix the power motor and its mounting seat to the outer surface of the right housing with 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 of the working end of the electrode during grinding. The cutting displacement control mechanism includes a displacement gear, a positive and negative ball thread shaft, a positive and negative ball thread sleeve, a second fixed key, a displacement gear bearing, a limit mechanism and a top screw. After the inner ring of the synchronous gear bearing is tightly fitted into the annular sinking platform of the outer circle of the fixed gear ring, the flange on the outer ring of the synchronous gear is used as a limit, and the inner hole of the synchronous gear is tightly fitted on the outer ring of the synchronous gear bearing;

[0014] After a pair of displacement power input gear bearings, a pair of displacement power transition gear bearings and the outer rings of the displacement gear bearings are respectively tightly fitted into the corresponding first mounting grooves, second mounting grooves, first fixed grooves, second fixed grooves, first bearing mounting grooves and second bearing mounting grooves provided on the left housing and the right housing, the right side journals of the displacement power input gear and the displacement power transition gear are respectively fitted into the inner rings of the corresponding bearings in the right housing, and the displacement power transition gears are respectively meshed with the displacement power input gear and the synchronous gear;

[0015] With the convex rings on the right sides of the two forward and reverse ball thread shafts as the limit, the right end journals are respectively inserted into the inner rings of the two displacement gear bearings placed in the right housing; the second fixed key is inserted into the keyway holes between the two forward and reverse ball thread shafts and the two displacement gears;

[0016] After completing the above assembly, the left rotating cover is installed into the corresponding rotating cover insertion hole opened on the left housing, and a chip isolation plate is fixed to the inner surface of the left rotating cover with 6 screws.

[0017] Close the left and right housings, and during the closing process, complete the following operations simultaneously: insert the outer ring of the left self-rotating bearing of the combined cutting tool into the inner hole of the bearing cover on the left rotating cover; insert the left shaft end of the limiting sleeve that has been inserted into the inner hole of the countersunk platform on the inner surface of the right rotating cover into the corresponding inner hole of the countersunk platform on the inner surface of the left rotating cover; insert the left shaft necks of the displacement power input gear and the displacement power transition gear into the inner rings of the power input gear bearing and the displacement power transition gear bearing placed in the left housing respectively; fit the inner rings of the two displacement gear bearings placed in the left housing onto the left shaft necks of the two positive and negative ball threaded shafts.

[0018] After the left shell and the right shell are closed, the left shell and the right shell are fastened and fixed with bolts; after the third fixing key is inserted into the inner hole of the keyway of the displacement power input gear, the stepper motor and the output shaft of the reducer are radially constrained with the displacement power input gear by key connection, and the stepper motor and the reducer are fixed to the outer surface of the right shell with 4 bolts; the 3 bolt insertion holes opened on the surface of the right rotating cover and the inner hole on the limit sleeve are successively passed through, and the relative position between the left rotating cover and the right rotating cover is fixed on both sides of the electrode grinding chamber with 3 bolts.

[0019] The combined cutting tool comprises a plane cutting tool, a curved cutting tool or a truncated cone-shaped cutting tool, a cutter shaft, an adjusting washer, a fourth fixing key and a self-rotating bearing; the outer circle of the plane cutting tool is axially tightly fitted and symmetrically installed in the inner hole of the self-rotating gear, and the rectangular flange in the axial middle part of the cutter shaft is embedded in the axial rectangular through hole correspondingly opened in the middle part of the plane cutting tool; according to the principle of consistent rotation direction of the left-handed and right-handed cutting edges opened on both sides of the plane cutting tool, a curved cutting tool or a truncated cone-shaped cutting tool with the same rotation direction of the cutting edge is respectively installed on both sides of the cutter shaft, and the fourth fixing key is used to radially constrain the two curved cutting tools or truncated cone-shaped cutting tools and the cutter shaft; after an adjusting washer is respectively embedded in the sinking platform on the axial outer side of the two curved cutting tools or truncated cone-shaped cutting tools, a pair of self-rotating bearings are respectively installed in parallel at the shaft neck positions of the shaft ends on both sides of the cutter shaft.

[0020] It also includes two sets of identical limiting mechanisms, which are mirror-imaged and placed on the positive and negative ball threaded shafts exposed on both sides of the closed shell, and each set of limiting mechanisms includes positive and negative ball threaded sleeves, support plates, limiting plates, end covers, top screws and limiting plate mounting bolts, wherein:

[0021] The sinking platforms at both ends of the two support plates are respectively mounted on the overhanging ends of the two forward and reverse ball thread shafts from the two sides of the closed shell, and a forward and reverse ball thread sleeve with a matching thread direction is screwed into the end of each of the forward and reverse ball thread shafts 1, and the relative positions of the forward and reverse ball thread sleeves on the support plates are locked with a top screw; an end cover is fixedly installed on the outer surface of the inner hole on both sides of each support plate with a limit plate mounting bolt; the convex surfaces of the two pairs of limit plates are fixedly installed inwardly on the corresponding sinking platforms opened in the middle of the two support plates by using the limit plate mounting bolts.

[0022] The follow-up swing mechanism is fixedly mounted on the outer rear surface of the closed shell to balance the cutting stress on both sides during the electrode grinding process. The follow-up swing mechanism includes a mounting plate, a support, a linear bearing, an optical axis, a retaining spring, a fixing plate and a compression spring, wherein: the mounting plate is fixedly mounted on the outer rear surface of the closed shell; after the two supports are fixedly mounted on both sides of the mounting plate, the two optical axes are passed through the corresponding holes on one side of the support from the outside;

[0023] Then, install the spring-linear bearing-spring on the two optical axes in sequence, and after passing through the corresponding holes on the support on the other side, use two retaining springs to lock the two sets of parts installed on the two optical axes between the inner surfaces of the supports on both sides; use bolts to fasten the fixing plate and the linear bearing.

[0024] The negative pressure chip suction system includes a negative pressure suction nozzle, a negative pressure generator and a negative pressure pipeline. The negative pressure suction nozzle is fixedly installed on the outer wall surface of one side of the closed shell, the inner hole of the negative pressure suction nozzle is connected to the negative pressure channel in the closed shell, and the end of the negative pressure suction nozzle is connected to the negative pressure generator through the above-mentioned negative pressure pipeline. The grinding chips instantly sucked out by negative pressure pass through the negative pressure channel, the negative pressure suction nozzle, the negative pressure pipeline and the negative pressure generator in the closed shell, and then are led to the chip collection tank specified by the user through the catheter.

[0025] The present invention has the following advantages and beneficial effects:

[0026] (1) The multi-edge combination cutting tool grinds the electrode in a cutting manner, and the cutting force is independent of the electrode pressure. Compared with the known technology of scraping and shaping the electrode with the help of electrode pressure, the service life of the cutting tool can be greatly improved.

[0027] (2) The multi-blade combination cutting tool uses a revolution + high-speed rotation method to grind the electrode, and only performs micro-positioning and cutting 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.

[0028] (3) Since the working surface of the electrode after grinding is flat and 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

[0029] Figure 1 A schematic diagram of the three-dimensional structure of an automatic electrode dresser provided in an embodiment of the present invention;

[0030] Figure 2 A left-side structural schematic diagram of an automatic electrode dresser provided in an embodiment of the present invention;

[0031] Figure 3 A left-side structural schematic diagram of the automatic electrode grinder provided by an embodiment of the present invention without the infinite position mechanism;

[0032] Figure 4 for Figure 2 A schematic diagram of the enlarged cross-sectional structure in the AA direction;

[0033] Figure 5 for Figure 2 A schematic diagram of the enlarged cross-sectional structure in the middle BB direction;

[0034] Figure 6 for Figure 2 An enlarged cross-sectional structural diagram in the CC direction;

[0035] Figure 7 A schematic diagram of the axial cross-sectional structure of a combined cutting tool in an automatic electrode sharpener provided in an embodiment of the present invention;

[0036] Figure 8 A schematic diagram of an axial cross-sectional structure of a plane cutting tool in a cutting tool is provided for an embodiment of the present invention;

[0037] Fig. 9 A schematic diagram of a radial cross-sectional structure of a plane cutting tool in a cutting tool is provided for an embodiment of the present invention;

[0038] Fig.10 A schematic diagram of an axial cross-sectional structure of a curved cutting tool in a cutting tool is provided for an embodiment of the present invention;

[0039] Fig.11 A schematic diagram of a radial cross-sectional structure of a curved cutting tool in a cutting tool is provided for an embodiment of the present invention;

[0040] Fig.12 A schematic diagram of an axial cross-sectional structure of a truncated cone-shaped cutting tool in a cutting tool is provided for an embodiment of the present invention;

[0041] Fig.13A schematic diagram of a radial cross-sectional structure of a truncated cone-shaped cutting tool in a cutting tool is provided for an embodiment of the present invention;

[0042] Fig.14 An enlarged three-dimensional structural schematic diagram of the left housing member in the automatic electrode dresser provided in an embodiment of the present invention;

[0043] Fig.15 An enlarged three-dimensional structural schematic diagram of the right housing member in the automatic electrode dresser provided in an embodiment of the present invention;

[0044] Fig.16 An enlarged three-dimensional structural schematic diagram of a left-turning cover in an automatic electrode dresser provided in an embodiment of the present invention;

[0045] Fig.17 An enlarged three-dimensional structural schematic diagram of a right-turning cover in an automatic electrode dresser provided in an embodiment of the present invention;

[0046] Fig.18 A schematic diagram of the main structure of a spherical electrode provided in an embodiment of the present invention;

[0047] Fig.19 This is a schematic diagram of the main structure of a truncated cone electrode provided in an embodiment of the present invention.

[0048] The following are marked in the figure:

[0049] 1-positive and negative ball thread shaft, 2-end cover, 3-top screw, 4-left housing, 5-right housing;

[0050] 6-support plate, 701-stepping motor, 702-reducer, 801-first fixing hole;

[0051] 802-second fixing hole, 9-mounting plate, 10-power motor, 11-support;

[0052] 12-linear bearing, 13-optical axis, 14-circlip, 15-fixing plate, 16-bolt insertion hole;

[0053] 17-negative pressure nozzle, 18-left turn cover, 19-limit plate mounting bolt, 20-limit plate;

[0054] 211-first bearing cap bolt, 212-second bearing cap bolt, 22-cambered cutting tool;

[0055] 231-first bearing cap, 232-second bearing cap, 24-knife shaft, 25-plane cutting tool;

[0056] 241 - first mounting through hole; 242 - second mounting through hole; 243 - third mounting through hole;

[0057] 26-rotation gear, 27-positioning pin, 28-chip separator, 29-screw;

[0058] 30-adjusting washer, 31-rotation bearing, 321-first electrode positioning hole;

[0059] 322 - second electrode positioning hole, 33 - revolving gear bearing, 331 - first revolving gear bearing mounting groove;

[0060] 332-second revolution gear bearing mounting groove, 34-power transition gear bearing;

[0061] 35-power transition gear, 36-power input gear bearing, 37-power input gear;

[0062] 38-first fixing key, 39-power motor mounting seat, 40-tooth guard plate, 41-revolution gear;

[0063] 42-limiting sleeve, 43-right-turn cover, 431-left-turn cover mounting hole, 432-right-turn cover mounting hole;

[0064] 44-revolution gear bolt, 440-revolution gear connection hole, 45-fixed gear ring;

[0065] 46-synchronous gear bearing, 461-first connecting groove, 462-second connecting groove; 47-synchronous gear, 48-positive and negative ball threaded sleeve, 49-displacement gear bearing;

[0066] 491 - first bearing mounting groove, 492 - second bearing mounting groove, 50 - second fixing key;

[0067] 51-displacement gear, 52-displacement power transition gear bearing, 521-first fixing groove;

[0068] 522 - second fixing groove, 53 - third fixing key, 54 - displacement power input gear bearing;

[0069] 541-first mounting groove, 542-second mounting groove, 55-displacement power input gear;

[0070] 56-displacement power transition gear, 57-fourth fixed key, 58-truncated cone-shaped cutting tool;

[0071] 591 - first bolt fixing hole, 592 - second bolt fixing hole, 601 - first negative pressure groove;

[0072] 602-second negative pressure groove, 61-stepping motor fixing bolt, 62-spherical electrode; 63-truncated cone electrode;

[0073] 641 - first plane; 642 - second plane; 651 - side surface of the working end of the first electrode; 652 - side surface of the working end of the second electrode. DETAILED DESCRIPTION

[0074] 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.

[0075] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0076] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0077] The present invention relates to an automatic electrode grinding device used on the electrode gripping rods of the machine arms on both sides of various automatic welding tongs during the resistance spot welding process. The automatic electrode grinder of the present invention uses a multi-blade combination cutting tool to grind the electrode in a cutting method of revolution + high-speed rotation and without the help of electrode pressure during the electrode grinding process. The working end surface of the electrode after grinding is a plane; the cutting amount of the electrode each time it is ground and the compensation amount of the electrode working angle change are controlled by a positioning and shifting cutting mechanism, so that the precise control of the electrode grinding amount each time can be achieved, the unnecessary cutting amount can be extremely compressed, and dynamic compensation can be implemented for the electrode working angle change. 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 the spot welding process, which can achieve significant positive effects in reducing the consumption of cutting tools and electrode materials, reducing the number of electrode replacements, reducing the cost of spot welding process and improving the quality of welds.

[0078] The inventive concept of the automatic grinding device for resistance spot welding electrodes of the present invention is:

[0079] (1) An electrode grinding method is established in which a multi-edge combined cutting tool performs micro-cutting positioning and cutting without the aid of electrode pressure by revolution + high-speed rotation, and changes the grinding method of the electrode working end face in the known technology from the grinding principle of single-edge spherical scraping or scraping shaping to the grinding principle of multi-edge plane cutting, thereby overcoming the disadvantages of the known electrode grinding technology, such as short tool life, excessive proportion of unnecessary electrode grinding in each grinding, and low power supply capacity to the welding part.

[0080] (2) The dynamic compensation function of the electrode grinding angle is introduced to prevent the adhesion state between the electrode working plane and the workpiece surface from being negatively affected by the incremental change of the electrode working axis angle, thus creating the necessary conditions for improving the quality of welds and reducing the cost of spot welding processes.

[0081] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0082] like Figures 1 to 19As 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 5 which are mirror images in appearance. The main parts of the mechanical structure for realizing the electrode grinding, cutting displacement control and electrode grinding angle compensation functions of the present invention are all placed in the closed shell; a follow-up swing mechanism for balancing the cutting stress on both sides during the electrode grinding process is fixedly installed on the outer rear surface of the closed shell; a negative pressure generator in a negative pressure chip suction system for realizing the immediate discharge of chips generated during the electrode grinding from the electrode grinding chamber is fixedly installed on the equipment bracket, and the negative pressure chip suction system The negative pressure suction nozzle is fixedly mounted on the outer side wall surface of the closed shell; when the electrode is ground, the working ends of the electrodes on the arm grips on both sides of the welding clamp, that is, the working ends of the spherical electrode 62 or the truncated cone electrode 63, are ground synchronously through the coordinated cooperation between the main part of the mechanical structure, the follow-up swing mechanism, and the negative pressure chip suction system; wherein, the power motor 10, the power motor mounting seat 39, the stepper motor 701 and the reducer 702, etc. in the mechanism are all fixedly mounted on the outer side surface of the right shell 5, and the limiting devices in the two sets of cutting displacement control and grinding angle compensation mechanisms are respectively exposed on both side surfaces of the closed shell.

[0083] like Figures 1 to 4 As shown, the main part of the mechanical structure in the present invention includes a set of electrode grinding mechanism, wherein the electrode grinding mechanism includes a grinding power drive device and two sets of electrode grinding devices placed in a closed shell; the grinding power drive device of the electrode grinding mechanism includes a power motor 10, a power motor mounting seat 39, a power input gear 37, a power transition gear 35, a power input gear bearing 36, a power transition gear bearing 34 and a first fixed key 38, etc.; the outer rings of the two power input gear bearings 36 and the two power transition gear bearings 34 are respectively matched and assembled After entering the corresponding bearing holes opened on the right housing 5 and the power motor mounting seat 39, the left shaft necks of the power input gear 37 and the power transition gear 35 are inserted into the inner rings of the power input gear bearing 36 and the power transition gear bearing 34 placed in the right housing 5, and the power input gear 37 and the power transition gear 35 are meshed with each other; after the first fixing key 38 is inserted into the keyway opened between the output shaft end of the power motor 10 and the power input gear 37, the power motor 10 and its mounting seat 39 are fixed to the outer surface of the right housing 5 with bolts.

[0084] like Figures 4 to 12As shown, the two sets of electrode grinding devices are coaxially arranged in a closed shell on both sides of the joint surface of the left shell 4 and the right shell 5, and are responsible for grinding the working ends of the spherical electrodes 62 or the truncated cone electrodes 63 on both sides during operation; the electrode grinding device includes a revolving gear 41, a left rotating cover 18 and a right rotating cover 43, a revolving gear bearing 33, a combined cutting tool, a fixed gear ring 45, a limiting sleeve 42, a first bearing cover 231, a second bearing cover 232, a chip separator 28, a tooth guard plate 40 and bolts and screws, etc.; the two revolving gear shafts are connected The inner rings of the bearings 33 are respectively tightly fitted into the corresponding annular sinks provided on the inner surfaces of the outer circles of the left-turning cover 18 and the right-turning cover 43, and the two chip shielding plates 28 are respectively fixed to the inner surfaces of the left-turning cover 18 and the right-turning cover 43 with 6 screws 29 to shield the grinding chips between the two revolving gear bearings 33 and the electrode grinding chamber during electrode grinding; the first bearing cover 231 and the second bearing cover 232 are respectively fixedly installed in the corresponding sinks provided on the outer surfaces of the left-turning cover 18 and the right-turning cover 43 with 4 bolts; the left-turning cover 18 is fixed to the inner surfaces of the right-turning cover 43 with 6 screws 29 to shield the grinding chips between the two revolving gear bearings 33 and the electrode grinding chamber during electrode grinding; the left-turning cover 18 is fixed to the inner surfaces of the right-turning cover 43 with 4 bolts to prevent the grinding chips from being cut during electrode grinding. The cover 18 is installed in the left cover mounting hole 431 opened on the left housing 4, and the right cover 43 is installed in the right cover mounting hole 432 opened on the right housing 5. During the installation process, the outer ring of the revolving gear bearing 33 assembled thereon is tightly fitted into the second revolving gear bearing mounting groove 332 correspondingly opened on the right housing 5 and the first revolving gear bearing mounting groove 331 correspondingly opened on the left housing 4; four revolving gear bolts 44 are used to fasten the revolving gear 41 to the right housing 5 through the revolving gear connecting hole 440. After the outer surface of the rotating cover 43, use 6 screws to fix the tooth guard plate 40 on the annular sinker on the outer surface of the revolving gear 41; fit the fixed gear ring 45 axially to the left side tightly into the sinker hole correspondingly opened on the inner side of the right shell 5; insert the self-rotating bearing 31 at one end of the combined cutting tool tightly into the bearing insertion hole of the right bearing cover 23, and make the self-rotating gear 26 on the combined cutting tool mesh with the fixed gear ring 45; insert one end of the three limiting sleeves 42 into the three corresponding sinker holes opened on the inner surface of the right rotating cover 43 respectively.

[0085] like Figure 5 , Figure 6 , Fig.14 and Fig.15As shown, the main part of the mechanical structure of the present invention also includes a cutting displacement control mechanism, which is responsible for the cutting displacement control and electrode grinding angle compensation work when the working end of the spherical electrode 62 or the working end of the truncated cone electrode 63 is ground; the cutting displacement control mechanism includes a grinding power drive device and two sets of cutting displacement control mechanisms; the grinding power drive device of the cutting displacement control mechanism includes a stepping motor 701, a reducer 702, a displacement power input gear 55, a displacement power transition gear 56, a synchronous gear 47, a third fixed key 53, a displacement power input gear bearing 54, a displacement power transition gear bearing 52 and a synchronous gear bearing 46, etc.; the cutting displacement control mechanism includes a displacement gear 51, a positive and negative ball thread shaft 1, a positive and negative ball thread sleeve 48, a second fixed key 50, a displacement gear bearing 49, a limiting mechanism and a top screw 3, etc.; after the inner ring of the synchronous gear bearing 46 is tightly fitted into the annular sink on the outer circle of the fixed gear ring 45, the flange on the outer ring of the synchronous gear 47 is used to fix the inner ring of the synchronous gear 47. For limiting, the inner hole of the synchronous gear 47 is tightly fitted on the outer ring of the synchronous gear bearing 46; after a pair of displacement power input gear bearings 54, a pair of displacement power transition gear bearings 52 and the outer rings of the displacement gear bearing 49 are respectively tightly fitted into the corresponding first mounting grooves 541, second mounting grooves 542, first fixed grooves 521, second fixed grooves 522, first bearing mounting grooves 491 and second bearing mounting grooves 492 opened on the left housing 4 and the right housing 5, the right side journals of the displacement power input gear 55 and the displacement power transition gear 56 are respectively fitted into the inner rings of the corresponding bearings in the right housing 5, and the displacement power transition gear 56 is respectively meshed with the displacement power input gear 55 and the synchronous gear 47; with the convex rings on the right sides of the two forward and reverse ball thread shafts 1 as limiting, the right end journals are respectively fitted and inserted into the inner rings of the two displacement gear bearings 49 placed in the right housing 5; the second fixed key 50 is inserted into the keyway hole between the two forward and reverse ball thread shafts 1 and the two displacement gears 51.

[0086] After completing the above assembly, insert the left-turn cover 18 assembly into the left-turn cover mounting hole 431 opened on the left shell body 4; close the left shell body 4 and the right shell body 5; during the closing process of the left shell body 4 and the right shell body 5, complete the following operations simultaneously: first, insert the outer ring of the left-side self-rotation bearing 31 of the combined cutting tool into the inner hole of the bearing cover 23 assembled on the left-turn cover 18; second, insert the left-side shaft end of the limiting sleeve 42 into the inner hole of the sinker opened correspondingly on the inner surface of the left-turn cover 18; third, insert the left-side shaft necks of the displacement power input gear 55 and the displacement power transition gear 56 into the inner rings of the power input gear bearing 54 and the displacement power transition gear bearing 52 placed in the left shell body 4 respectively; fourth, fit the inner rings of the two displacement gear bearings 49 placed in the left shell body 4 onto the left-side shaft necks of the two positive and negative ball threaded shafts 1. After the left shell 4 and the right shell 5 are closed, the left shell 4 and the right shell 5 are fastened and fixed with fastening bolts; after the third fixing key 53 is inserted into the keyway hole of the displacement power input gear 55, the output shaft of the reducer 702 and the displacement power input gear 55 are radially constrained by key connection, and the stepper motor 701 and the reducer 702 are fixed to the outer surface of the right shell 5 with four connecting bolts; the three bolt insertion holes 16 opened on the surface of the right rotating cover 43 and the inner hole on the limit sleeve 42 are successively passed through, and the relative position between the left rotating cover 18 and the right rotating cover 43 is fixed on both sides of the electrode grinding chamber with three fixing bolts.

[0087] like Figures 4 to 12 As shown, the present invention also includes a set of combined cutting tools, which include a plane cutting tool 25, a curved cutting tool 22 or a truncated cone-shaped cutting tool 58, a cutter shaft 24, an adjusting washer 30, a fourth fixed key 57 and a self-rotating bearing 31, etc.; the outer circle of the plane cutting tool 25 is axially tightly fitted and symmetrically installed in the inner hole of the self-rotating gear 26, and the rectangular flange of the axial middle part of the cutter shaft 24 is embedded in the axial rectangular through hole corresponding to the middle part of the plane cutting tool 25; according to the openings on both sides of the plane cutting tool 25, the fourth fixed key 57 is installed in the inner hole of the self-rotating gear 26; According to the principle of consistent rotation direction of left-hand and right-handed cutting edges, a curved cutting tool 22 or a truncated cone-shaped cutting tool 58 with the same rotation direction of the cutting edge is respectively installed on both sides of the cutter shaft 24, and a fourth fixed key 57 is used to radially constrain the two curved cutting tools 22 or truncated cone-shaped cutting tools 58 and the cutter shaft 24; after an adjusting washer 30 is embedded in the sinker on the axial outer side of the two curved cutting tools 22 or truncated cone-shaped cutting tools 58, a pair of rotating bearings 31 are respectively installed in parallel at the journal positions of the shaft ends on both sides of the cutter shaft 24.

[0088] like Figure 8 and Fig. 9As shown, the planar cutting tool 25 has an outer structure of a thin-walled circular ring with symmetrical convex rings on both axial sides of the outer circumference, and a rectangular through hole is axially opened in the center thereof to form a clearance fit with the rectangular flange opened in the middle of the cutter shaft 24; the surfaces of the convex rings on both axial sides are planes parallel to each other, and positive and negative rotation cutting edges are respectively opened on them; when the spherical 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 25 are always in contact with the working end planes 64 of the spherical electrodes 62 or the truncated cone electrodes 63 to be ground on both sides, and only undertake the grinding of the first plane 641 of the working ends of the spherical electrodes 62 or the second plane 642 of the working ends of the truncated cone electrodes 63 on both sides.

[0089] like Figures 10 to 12 As shown, the arc surface cutting tool 22 or the truncated cone cutting tool 58 is named according to the outer contour shape of the cutting edge in the axial section of the arc surface cutting tool 22 or the truncated cone cutting tool 58, and an axial through hole matching the diameter of the cutter shaft 24 and a keyway matching the key 57 are provided in the center thereof; the electrodes used in production include two types: spherical electrodes 62 and truncated cone electrodes 63. The selection of the arc surface cutting tool 22 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 electrode working end; the arc radius R of the cutting edge of the arc surface cutting tool 22 is equal to the arc radius R of the side of the spherical electrode 62 to be ground, The surface shape of the electrode after grinding is determined by the user's requirements; 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; when the combined cutting tool is assembled, the cutting edge rotation direction of the arc cutting tools 22 or the truncated cone cutting tools 58 on both sides must be the same as the cutting edge rotation direction of the plane cutting tool 25 on the same side in the middle of the blade shaft 24; when grinding the electrode, the cutting edge of the arc cutting tool 22 or the truncated cone cutting tool 58 is only used to grind the first electrode working end side 651 on both sides of the working end of the spherical electrode 62 to be ground or the second electrode working end side 652 on both sides of the working end of the truncated cone electrode 63. At the same time, the plane cutting tool 25 is installed on the blade shaft 24 through the first mounting through hole 241 provided thereon; the arc cutting tool 22 is installed on the blade shaft 24 through the second mounting through hole 242 provided thereon; and the truncated cone cutting tool 58 is installed on the blade shaft 24 through the third mounting through hole 243 provided thereon.

[0090] The plane cutting tool 25, the arc cutting tool 22 and the truncated cone cutting tool 58 are essentially formed milling cutters of different shapes, and their cutting edge parameters are the same as the corresponding parameters of the same type of milling cutters; the number of cutting teeth n1, n2 or n3 processed on the plane cutting tool 25, the arc cutting tool 22 and the truncated cone cutting tool 58 is determined by the diameter of the corresponding cutting tool. When the diameter of the spherical electrode 62 or the truncated cone electrode 63 increases, the diameter and the number of cutting edges of each cutting tool also increase accordingly.

[0091] The automatic grinding device for resistance welding electrodes provided in the embodiment of the present invention also includes two sets of identical limiting mechanisms, which are mirror-imaged and disposed on the positive and negative ball thread shafts 1 exposed on both sides of the closed shell, and each set of limiting mechanisms includes a positive and negative ball thread sleeve 48, a support plate 6, a limiting plate 20, an end cover 2, a top screw 3 and a limiting plate mounting bolt 19, etc.; the sinks at both ends of the two support plates 6 are respectively mounted on the overhanging ends of the two positive and negative ball thread shafts 1 from both sides of the closed shell, and each of the positive and negative ball thread shafts 1 is provided with a plurality of fixing screws. A positive and negative ball threaded sleeve 48 with a matching thread direction is screwed into each end, and a top screw 3 is used to lock the relative position of each positive and negative ball threaded sleeve 48 on the support plate 6; an end cover 2 is fixedly installed on the outer surface of the inner hole on both sides of each support plate 6 by a limit plate mounting bolt 19; the convex surfaces of the two pairs of limit plates 20 are fixed inwardly on the corresponding sinking platforms opened in the middle of the two support plates 6 by using the limit plate mounting bolts 19; when working, the two sets of limit mechanisms are responsible for positioning the grinding benchmark and grinding angle compensation when grinding the electrodes on both sides.

[0092] like Figures 1 to 3 As shown, the present invention also includes a set of follow-up swing mechanism, which is fixedly mounted on the outer surface of the rear part of the closed housing through the mounting plate 9, and the follow-up swing mechanism includes the mounting plate 9, the support 11, the linear bearing 12, the optical axis 13, the retaining spring 14, the fixing plate 15 and the compression spring not shown in the figure. The mounting plate 9 is fixedly mounted on the outer surface of the rear part of the closed housing; after the two supports 11 are fixedly mounted on both sides of the mounting plate 9, the two optical axes 13 are passed from the outside through the corresponding holes on one side of the support 11, and then the spring-linear bearing 12-spring are respectively mounted on the two optical axes 13 in sequence, and then the two sets of parts mounted on the two optical axes 13 are locked between the inner surfaces of the supports 11 on both sides by two retaining springs 14; the fixing plate 15 and the linear bearing 12 are fastened and connected by bolts.

[0093] like Figure 1 , Figure 2 , Figure 3 as well as Fig.11As shown, the present invention also includes a set of negative pressure chip suction system, which includes: a negative pressure suction nozzle 17, a negative pressure generator and a negative pressure pipeline. The negative pressure suction nozzle 17 is fixedly installed on the outer wall surface of one side of the closed shell with two first bolt fixing holes 591 and two second bolt fixing holes 592. Its inner hole is connected to the negative pressure channel formed by the first negative pressure groove 601 and the second negative pressure groove 602 respectively opened on the left shell 4 and the right shell 5, and its outer side is connected to the negative pressure generator through the negative pressure pipeline. 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, negative pressure suction nozzle 17, negative pressure pipeline and negative pressure generator in the closed shell, and then led to the chip collection tank specified by the user through the catheter.

[0094] like Fig.11 As shown, the outer structures of the left shell 4 and the right shell 5 are mirror images; except for the mounting holes of the power input gear bearing 36 and the power transition gear bearing 34 which only exist on the right shell 5, the other process holes exist in the left shell 4 and the right shell 5 accordingly.

[0095] like Fig.12 As shown, due to the independent assembly relationship between the right-turn cover 43 and the revolving gear 41 described in the present invention and the need for an additional tooth guard plate 40 on the outside of the revolving gear 41, in addition to the four bolt holes added on the right-turn cover 43 for assembling the revolving gear 41 and a diameter slightly smaller than that of the left-turn cover 18, the other process holes and assembly sinks are in a mirror relationship.

[0096] The bearing cap 23 in the electrode grinding mechanism of the present invention is fixedly mounted on the corresponding inside and outside of the countersunk platforms opened on the outer surfaces of the left-turning cover 18 and the right-turning cover 43 by four bolts respectively. After confirming that the grinding result of the working end of the spherical electrode 62 or the truncated cone electrode 63 to be ground meets the requirements, two positioning pins 27 are punched thereon.

[0097] Figure 18 to Figure 19 Two types of electrodes used in production are shown respectively, including a spherical electrode 62 and a truncated cone electrode 63. The selection of the arc cutting tool 22 and the truncated cone cutting tool 58 in the automatic electrode grinder of the present invention is determined by the shape requirements of the spherical electrode 62 or the truncated cone electrode 63 used in the production site.

[0098] The working process of the electrode dresser of the present invention is as follows:

[0099] When the welding clamp carrying the spherical electrode 62 or the truncated cone electrode 63 to be ground arrives at the electrode grinding position, its axial direction is limited by the contact between the lower end faces of the electrode gripping rods on both sides and the upper surfaces of the limit plates 20 on both sides of the cutting displacement mechanism, and its radial direction is accurately positioned by the contact between the first electrode positioning hole 321 provided on the left-turning cover 18 and the second electrode positioning hole 322 provided on the right-turning cover 43 and the working end side surface 651 of the first electrode to be ground and the working end side surface 652 of the second electrode to be ground. After the automatic grinder receives the in-position instruction of the spherical electrode 62 or the truncated cone electrode 63 issued by the robot, the power motor 10 of the automatic grinder is started, and the rotational power is transmitted to the revolving gear 41 through the power input gear 37 and the power transition gear 35; when the revolving gear 41 rotates, the left-turning cover 18 and the right-turning cover 43 are driven to rotate synchronously through the connecting bolts and the limit sleeve 42, and the cutting tool placed between the left-turning cover 18 and the right-turning cover 43 is driven to rotate synchronously with the revolving gear 41; because the self-rotating gear 26 is meshed with the fixed gear ring 45 at the same time, the combined cutting tool will rotate at a higher working speed with the cutter shaft 24 as the axis according to the tooth ratio relationship between the fixed gear ring 45 and the self-rotating gear 26, thereby forming the working characteristics of the cutting tool of the automatic electrode grinder of the present invention in the process of electrode grinding, which is the revolving + high-speed rotation.

[0100] After the power motor 10 reaches the working speed, the stepper motor 701 starts to work; the shaft end of the output shaft of the stepper motor 701 passes through the displacement power input gear 55, the displacement power transition gear 56 and the synchronous gear 47, and then synchronously transmits the rotational power to the two displacement gears 51 arranged on both sides of the synchronous gear 47 and meshing therewith, and drives the two forward and reverse ball thread shafts 1 to rotate synchronously through the second fixed key 50; during the synchronous rotation of the two forward and reverse ball thread shafts 1, the two pairs of forward and reverse ball thread sleeves 48 with forward and reverse threads on the shaft ends on both sides can only move linearly towards each other along the axial direction of the two forward and reverse ball thread shafts 1, and drive The support plates 6 on both sides move toward each other synchronously, and at the same time, the spherical electrodes 62 or truncated cone electrodes 63 to be ground on both sides are gradually fitted with the cutting edge of the combined cutting tool from both sides along with the limit plates 20 on the support plates 6 on both sides, and the grinding process of the working end of the spherical electrode 62 or truncated cone electrode 63 begins. The axial feeding speed of the spherical electrode 62 or truncated cone electrode 63 to be ground is determined by the rotation speed of the stepper motor 701, that is, the cutting and grinding speed during the electrode grinding process; when the cutting and grinding displacement reaches the program preset value of the stepper motor 701, the stepper motor 701 stops working immediately and waits on the spot for the next electrode grinding instruction.

[0101] When the spherical 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 spherical electrode 62 or the truncated cone electrode 63 on both sides and the axis of the first electrode positioning hole 321 and the second electrode positioning hole 322 of the automatic 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 will drive the working end of the automatic 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.

[0102] The electrode grinding angle compensation function is completed simultaneously by using the cutting displacement control function mechanism: when the support plates 6 disposed on both sides of the closed shell move toward each other along the axial direction of the positive and negative ball thread shafts 1 to grind the electrode, the inclination angle of the electrode gripping rod will inevitably change. The electrode grinding angle compensation function uses the program controllability of the stepper motor 701 to form a logical correspondence between the axial displacement increment of the electrode during the electrode grinding process and the increment of the axial inclination angle change 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.

[0103] The negative pressure generator and the power motor 10 work according to the same control instruction; the chamber surrounded by the inner surface of the left-turning cover 18 and the right-turning cover 43 and the inner surface of the fixed gear ring 45 is the electrode grinding chamber, which is connected to the negative pressure channel formed by the first negative pressure groove 601 and the second negative pressure groove 602 respectively opened on the inner side of the left shell 4 and the right shell 5. The chips generated during the electrode grinding can be immediately sucked out through the negative pressure suction nozzle 17 to the outside of the closed shell formed by the left shell 4 and the right shell 5 of the automatic grinder.

[0104] After the electrode grinding is completed, the arms on both sides of the welding clamp carry the finished electrode from both sides of the closed shell according to the control command to exit the automatic grinding machine, and the robot simultaneously sends a signal command that the spherical electrode 62 or the truncated cone electrode 63 has left the automatic grinding machine, and the power motor 10 and the negative pressure generator of the automatic electrode grinding machine 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.

[0105] The automatic electrode grinder for resistance welding electrodes of the embodiment of the present invention is fixedly mounted on a bracket using a fixing plate 15 during installation. Since the production site has different requirements for the working height and posture of various welding tongs during grinding, the bracket for installing the equipment needs to be specially configured according to the site requirements, so the bracket for installing the electrode grinder and the negative pressure generator fixed thereon are not shown in the drawings of the present invention.

[0106] In summary, the present invention achieves the grinding of the working end of the spherical electrode 62 or the truncated cone electrode 63 to be ground without the help of electrode pressure and by using the electrode grinding method of the multi-edge combination cutting tool revolution + high-speed rotation, which overcomes 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, it creates conditions for the positioning and shifting cutting and grinding of the electrode of the multi-edge combination cutting tool 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 provides real-time guarantee for the attachment state of the electrode working surface and the workpiece surface during the spot welding operation. The implementation of the above technical measures together reduces the cutting load of the cutting tool edge sharply, greatly improves 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 basic guarantee conditions for improving the electrode feeding efficiency, reducing the energy consumption of the spot welding process and ensuring the quality of the weld.

[0107] 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 and grinding angle compensation functions is placed inside the closed shell body; a follow-up swing mechanism for adjusting and balancing the cutting stress on both sides during electrode grinding is fixedly mounted on the surface of the rear part of the outer side of the closed shell body; a negative pressure generator in a negative pressure chip suction system for realizing immediate discharge of chips generated during electrode grinding from the electrode grinding chamber is fixedly mounted on the equipment bracket, and a negative pressure suction nozzle in the negative pressure chip suction system is fixedly mounted on the outer side wall surface of the closed shell body; during electrode grinding, the working ends of the electrodes on the arm grips on both sides of the welding clamp are synchronously ground through the coordinated cooperation between the main part of the mechanical structure, the follow-up swing mechanism and the negative pressure chip suction system. The main part of the mechanical structure includes an electrode grinding mechanism, wherein: The electrode 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 inside the closed shell, and the grinding power drive device is fixedly arranged on the outer surface of one side of the closed shell, and is used to drive the two sets of electrode grinding devices to grind the working ends of the electrodes on the arm grips on both sides of the welding clamp; The two sets of electrode grinding devices are coaxially arranged in a closed shell on both sides of the joint surface of the left shell and the right shell, and are responsible for grinding the working ends of the electrodes on both sides during operation. The electrode grinding device includes a revolving gear, a left-turning cover and a right-turning cover, a revolving gear bearing, a combined cutting tool, a fixed gear ring, a limiting sleeve, a first bearing cover, a second bearing cover, a chip separator, and a tooth guard plate; the inner rings of the two revolving gear bearings are respectively tightly fitted into the corresponding annular sinks opened on the inner surfaces of the outer circles of the left-turning cover and the right-turning cover, and the two chip separators are respectively fixed to the inner surfaces of the left-turning cover and the right-turning cover with multiple screws, so as to shield the grinding chips between the two revolving gear bearings and the electrode grinding chamber during electrode grinding; the first bearing cover and the second bearing cover are respectively fixedly installed in the corresponding sinks opened on the outer surfaces of the left-turning cover and the right-turning cover with multiple bolts.

2. The automatic grinding device for resistance spot welding electrodes according to claim 1, characterized in that: The grinding power drive device includes a power motor, a power motor mounting seat, a power input gear, a power transition gear, a power input gear bearing, a power transition gear bearing and a first fixed key; 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 housing and the power motor mounting seat.

3. The automatic grinding device for resistance spot welding electrodes according to claim 2, characterized in that: Insert the left shaft necks of the power input gear and the power transition gear into the inner rings of the power input gear bearing and the power transition gear bearing placed in the right housing, and make the power input gear and the power transition gear mesh with each other; insert the first fixed key into the keyway provided between the output shaft end of the power motor and the power input gear, and then fix the power motor and its mounting seat to the outer surface of the right housing with bolts.

4. 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 of the working end of the electrode during grinding. The cutting displacement control mechanism includes a displacement gear, a positive and negative ball thread shaft, a positive and negative ball thread sleeve, a second fixed key, a displacement gear bearing, a limit mechanism and a top screw. After the inner ring of the synchronous gear bearing is tightly fitted into the annular sinking platform of the outer circle of the fixed gear ring, the flange on the outer ring of the synchronous gear is used as a limit, and the inner hole of the synchronous gear is tightly fitted on the outer ring of the synchronous gear bearing; After a pair of displacement power input gear bearings, a pair of displacement power transition gear bearings and the outer rings of the displacement gear bearings are respectively tightly fitted into the corresponding first mounting grooves, second mounting grooves, first fixed grooves, second fixed grooves, first bearing mounting grooves and second bearing mounting grooves provided on the left housing and the right housing, the right side journals of the displacement power input gear and the displacement power transition gear are respectively fitted into the inner rings of the corresponding bearings in the right housing, and the displacement power transition gears are respectively meshed with the displacement power input gear and the synchronous gear; With the convex rings on the right sides of the two forward and reverse ball thread shafts as the limit, the right end journals are respectively inserted into the inner rings of the two displacement gear bearings placed in the right housing; the second fixed key is inserted into the keyway holes between the two forward and reverse ball thread shafts and the two displacement gears; After the assembly is completed, the left rotating cover is installed into the corresponding rotating cover insertion hole opened on the left housing, and a chip isolation plate is fixed to the inner surface of the left rotating cover with 6 screws.

5. The automatic grinding device for resistance spot welding electrodes according to claim 1, characterized in that: Close the left and right housings, and during the closing process, complete the following operations simultaneously: insert the outer ring of the left self-rotating bearing of the combined cutting tool into the inner hole of the bearing cover on the left rotating cover; insert the left shaft end of the limiting sleeve that has been inserted into the inner hole of the countersunk platform on the inner surface of the right rotating cover into the corresponding inner hole of the countersunk platform on the inner surface of the left rotating cover; insert the left shaft necks of the displacement power input gear and the displacement power transition gear into the inner rings of the power input gear bearing and the displacement power transition gear bearing placed in the left housing respectively; fit the inner rings of the two displacement gear bearings placed in the left housing onto the left shaft necks of the two positive and negative ball threaded shafts.

6. The automatic grinding device for resistance spot welding electrodes according to claim 5, characterized in that: After the left shell and the right shell are closed, the left shell and the right shell are fastened and fixed with bolts; after the third fixing key is inserted into the inner hole of the keyway of the displacement power input gear, the stepper motor and the output shaft of the reducer are radially constrained with the displacement power input gear by key connection, and the stepper motor and the reducer are fixed to the outer surface of the right shell with 4 bolts; the 3 bolt insertion holes opened on the surface of the right rotating cover and the inner hole on the limit sleeve are successively passed through, and the relative position between the left rotating cover and the right rotating cover is fixed on both sides of the electrode grinding chamber with 3 bolts.

7. The automatic grinding device for resistance spot welding electrodes according to claim 5, characterized in that: The combined cutting tool comprises a plane cutting tool, a curved cutting tool or a truncated cone-shaped cutting tool, a cutter shaft, an adjusting washer, a fourth fixing key and a self-rotating bearing; the outer circle of the plane cutting tool is axially tightly fitted and symmetrically installed in the inner hole of the self-rotating gear, and the rectangular flange in the axial middle part of the cutter shaft is embedded in the axial rectangular through hole correspondingly opened in the middle part of the plane cutting tool; according to the principle of consistent rotation direction of the left-handed and right-handed cutting edges opened on both sides of the plane cutting tool, a curved cutting tool or a truncated cone-shaped cutting tool with the same rotation direction of the cutting edge is respectively installed on both sides of the cutter shaft, and the fourth fixing key is used to radially constrain the two curved cutting tools or truncated cone-shaped cutting tools and the cutter shaft; after an adjusting washer is respectively embedded in the sinking platform on the axial outer side of the two curved cutting tools or truncated cone-shaped cutting tools, a pair of self-rotating bearings are respectively installed in parallel at the shaft neck positions of the shaft ends on both sides of the cutter shaft.

8. The automatic grinding device for resistance spot welding electrodes according to claim 1, characterized in that: It also includes two sets of identical limiting mechanisms, which are mirror-imaged and placed on the positive and negative ball threaded shafts exposed on both sides of the closed shell, and each set of limiting mechanisms includes positive and negative ball threaded sleeves, support plates, limiting plates, end covers, top screws and limiting plate mounting bolts, wherein: The sinking platforms at both ends of the two support plates are respectively mounted on the overhanging ends of the two forward and reverse ball thread shafts from the two sides of the closed shell, and a forward and reverse ball thread sleeve with a matching thread direction is screwed into the end of each of the forward and reverse ball thread shafts, and the relative positions of the forward and reverse ball thread sleeves on the support plates are locked with a top screw; an end cover is fixedly installed on the outer surface of the inner hole on both sides of each support plate with a limit plate mounting bolt; the convex surfaces of the two pairs of limit plates are fixedly installed inwardly on the corresponding sinking platforms opened in the middle of the two support plates by using the limit plate mounting bolts.

9. The automatic grinding device for resistance spot welding electrodes according to claim 1, characterized in that: The follow-up swing mechanism is fixedly mounted on the outer rear surface of the closed shell to balance the cutting stress on both sides during the electrode grinding process. The follow-up swing mechanism includes a mounting plate, a support, a linear bearing, an optical axis, a retaining spring, a fixing plate and a compression spring, wherein: the mounting plate is fixedly mounted on the outer rear surface of the closed shell; after the two supports are fixedly mounted on both sides of the mounting plate, the two optical axes are passed through the corresponding holes on one side of the support from the outside; Then, install the spring-linear bearing-spring on the two optical axes in sequence, and after passing through the corresponding holes on the support on the other side, use two retaining springs to lock the two sets of parts installed on the two optical axes between the inner surfaces of the supports on both sides; use bolts to fasten the fixing plate and the linear bearing.

10. The automatic grinding device for resistance spot welding electrodes according to claim 1, characterized in that: The negative pressure chip suction system includes a negative pressure suction nozzle, a negative pressure generator and a negative pressure pipeline. The negative pressure suction nozzle is fixedly installed on the outer wall surface of one side of the closed shell, the inner hole of the negative pressure suction nozzle is connected to the negative pressure channel in the closed shell, and the end of the negative pressure suction nozzle is connected to the negative pressure generator through the above-mentioned negative pressure pipeline. The grinding chips instantly sucked out by negative pressure pass through the negative pressure channel, the negative pressure suction nozzle, the negative pressure pipeline and the negative pressure generator in the closed shell, and then are led to the chip collection tank specified by the user through the catheter.

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