CN116140921A

CN116140921A - Automatic coping device for resistance spot welding electrode

Info

Publication number: CN116140921A
Application number: CN202310300294.9A
Authority: CN
Inventors: 顾寅; 顾扬; 陈林; 吕元亮; 李耀; 邵东辉; 刘为民
Original assignee: Yangfan Yanhua Tianjin Technology Development Co ltd
Current assignee: Yangfan Yanhua Tianjin Technology Development Co ltd
Priority date: 2023-03-24
Filing date: 2023-03-24
Publication date: 2023-05-23

Abstract

The invention relates to an automatic coping device for a resistance spot welding electrode, which comprises a closed shell consisting of a left shell and a right shell which are in mirror image relation in appearance, wherein a mechanical structure main body part for realizing the functions of electrode coping, cutting displacement control, coping angle compensation and the like is arranged in the closed shell. The invention uses the multi-blade combined cutting tool and adopts revolution and high-speed autorotation to cut and sharpen the electrode, and the working surface of the sharpened electrode is a plane; the cutting displacement control mechanism positions and moves the micro-cutting grinding on the surface to be repaired of the electrode under the condition of no external force; the electrode grinding angle can be compensated according to different deflection deformation of the welding tongs arms, and full-surface contact between the working surface of the electrode and the surface of the workpiece during welding is ensured. The grinding principle of the invention can obtain obvious positive effects in the aspects of prolonging the service life of the cutting tool, extremely compressing the unnecessary cutting amount of the electrode, improving the quality of welding spots, reducing the cost of the spot welding process and the like.

Description

Automatic coping device for resistance spot welding electrode

Technical Field

The invention relates to process equipment for repairing and grinding a resistance spot welding electrode, in particular to an automatic repairing and grinding device for the resistance spot welding electrode.

Background

In the continuous spot welding process, the working surface state of the electrode is gradually deteriorated along with the increment of the number of welding spots under the cyclic action of harsh process environments such as high temperature, high pressure and the like, and the negative effects on the welding quality, the cost of the spot welding process and the like are gradually increased. In order to reduce the larger negative influence caused by the overlarge change of the working surface state of the electrode, the working end part of the electrode is polished regularly in production, so that the aim of restricting the quality dispersion of welding spots within an acceptable range is fulfilled by the countermeasure that the diameter of the working end part and the surface state of the electrode are limited within a certain fluctuation range.

The electrode coping device is mainly intended to achieve the following purposes: firstly, the diameter of the working surface of the electrode which is increased is restored to an initial set value, and a necessary condition is created for controlling the nugget diameter of the welding spot; secondly, removing a new oxide forming layer formed on the working surface of the electrode in the previous spot welding process, and creating necessary conditions for improving the quality of welding spots and reducing the cost of a spot welding process; thirdly, the two polished electrode working surfaces are guaranteed to be parallel to the workpiece surface during spot welding operation, the effective contact area and the feeding capacity of the electrode working surfaces and the workpiece surface are improved, and necessary conditions are created for improving the quality of welding spots and reducing the cost of a spot welding process.

The electrode automatic grinding device of the prior art mainly has the following defects:

(1) The grinding principle of the electrode automatic grinding device in the prior art is similar, and has the following common properties: firstly, because the outline shape of the cutting edge section of the sharpening or shaping tool for the electrode working surface part is arc-shaped, the initial state of the sharpened electrode working surface is a spherical surface with the same curvature radius as the cutting edge of the tool, and the planar contact between the electrode working surface and the workpiece surface is difficult to realize under the condition of ensuring the quality of the welding spot surface, the actual power feeding capacity of the electrode working surface, the quality assurance of the welding spot and the like directly form negative effects; secondly, the welding pliers do not have the compensation capability of deflection of the working surface of the electrode, which is caused by the necessary deflection deformation of the welding pliers arm during the spot welding operation, the inclination angle of the holding rod of the electrode and the like, and the feeding capability of the working surface of the electrode and the quality assurance of welding spots continuously form negative effects in the continuous spot welding process.

(2) When the electrode is sharpened or shaped, the sharpening essence of the cutting edge of the cutting tool is scraping or the combined action result of compression and scraping, and the purpose of scraping or shaping can be realized by providing enough pressure for the cutting edge of the cutting tool, so that the service life of the cutting tool is limited; the scraping force or shaping force of the cutting edge of the cutting tool to electrode sharpening is established by electrode pressure and cutting tool rotation torque together, the scraping force or shaping force and the sharpening amount of each time are positively related to the blunting condition of the cutting edge, and if the aim of ensuring that a newly formed layer on the electrode surface can be effectively removed during each sharpening is achieved, the unnecessary cutting amount must be set to be large enough.

Disclosure of Invention

Aiming at the simultaneous grinding of two sides in the prior art, the invention provides an automatic grinding device for a resistance spot welding electrode, which synchronously completes the functions of electrode grinding, cutting displacement control, grinding angle compensation and the like on the basis of simultaneous grinding of the electrodes on the two sides.

In order to solve the technical problems, the invention provides an automatic coping device for a resistance spot welding electrode, which comprises a closed shell formed by a left shell and a right shell which are in mirror image relation in appearance, wherein a mechanical structure main body part for realizing functions of electrode coping, cutting displacement control, coping angle compensation and the like is arranged in the closed shell; the follow-up swinging mechanism for adjusting and balancing cutting stress on two sides in the electrode grinding process is fixedly arranged 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 is fixedly arranged on the equipment bracket, and the negative pressure suction nozzle in the negative pressure chip suction system is fixedly arranged on the surface of the lateral wall of the outer side of the closed shell; during electrode coping, through cooperation between mechanical structure main part, follow-up swing mechanism, the negative pressure chip suction system, the coping of the working end of electrode on the horn holding rod of welding tongs both sides is accomplished in step, mechanical structure main part includes electrode coping mechanism, wherein:

The electrode polishing mechanism comprises a polishing power driving device and two sets of electrode polishing devices, wherein the two sets of electrode polishing devices are coaxially arranged in the closed shell, and the polishing power driving device is fixedly arranged on the outer surface of the closed shell and is used for driving the two sets of electrode polishing devices to polish the working end parts of the electrodes on the holding rods of the arms at two sides of the welding pliers;

the two sets of electrode grinding devices are coaxially arranged in the closed shells at two sides of the joint surface of the left shell and the right shell, and are used for respectively bearing grinding of the working end parts of the electrodes at two sides during working, and each electrode grinding device comprises a revolution gear, a left rotating cover, a right rotating cover, a revolution gear bearing, a combined cutting tool, a fixed gear ring, a limiting sleeve, a first bearing cover, a second bearing cover, a chip separation plate and a tooth protection plate; the inner rings of the two revolution gear bearings are respectively and tightly matched and arranged on corresponding annular countersunk platforms arranged on the inner surfaces of the outer circles of the left rotating cover and the right rotating cover, and the two chip separating plates are respectively fixed on the inner side surfaces of the left rotating cover and the right rotating cover by a plurality of screws, so that grinding chips between the two revolution gear bearings and the electrode grinding cavity during electrode grinding are shielded; the first bearing cover and the second bearing cover are respectively and fixedly arranged in corresponding sinking tables arranged on the outer side surfaces of the left rotating cover and the right rotating cover by a plurality of bolts.

The grinding power driving device comprises 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; and respectively matching the outer rings of the two power input gear bearings and the two power transition gear bearings into corresponding bearing holes formed in the right shell and the power motor mounting seat.

The left shafts of the power input gear and the power transition gear are inserted into the inner rings of the power input gear bearing and the power transition gear bearing which are arranged in the right shell in a matched manner, and the power input gear and the power transition gear are meshed with each other; after the first fixed key is matched and inserted into a key slot arranged between the output shaft end of the power motor and the power input gear, the power motor and the mounting seat thereof are fixed on the outer side surface of the right shell by bolts.

The mechanical structure main body part also comprises a cutting displacement control mechanism, wherein the cutting displacement control mechanism respectively bears cutting displacement control and electrode grinding angle compensation work when the working end part of an electrode is ground, the cutting displacement control mechanism comprises a displacement gear, a positive and negative ball screw shaft, a positive and negative ball screw sleeve, a second fixed key, a displacement gear bearing, a limiting mechanism and a jackscrew, an inner ring of the synchronous gear bearing is tightly matched and installed on an annular sinking table of the outer circle of a fixed gear ring, a flange on the outer ring of the synchronous gear is used as a limit, and an inner hole of the synchronous gear is tightly matched and sleeved on the outer ring of the synchronous gear bearing;

After a pair of alignment moving force input gear bearings, a pair of alignment moving force transition gear bearings and outer rings of the displacement gear bearings are respectively and tightly matched and installed in corresponding first installation grooves, second installation grooves, first fixing grooves, second fixing grooves, first bearing installation grooves and second bearing installation grooves which are formed in a left shell and a right shell, right side shafts of the displacement power input gear and the displacement power transition gear are respectively and tightly matched and installed in inner rings of corresponding bearings in the right shell, and the displacement power transition gear is respectively meshed with the displacement power input gear and the synchronous gear;

taking the convex rings on the right sides of the two positive and negative ball screw shafts as limiting positions, and respectively inserting the shaft necks at the right ends of the convex rings into the inner rings of the two displacement gear bearings in the right shell in a matched manner; a second fixed key is inserted into a key slot hole between the two positive and negative ball threaded shafts and the two displacement gears;

after the assembly is completed, the left rotary cover is put into a corresponding rotary cover insertion hole opened in the left housing, and a chip separating plate is fixed on the inner side surface of the left rotary cover by using 6 screws.

Closing the left shell and the right shell, and synchronously completing the following operations in the closing process: the outer ring of the self-rotating bearing on the left side of the combined cutting tool is inserted into the inner hole of the bearing cover on the left rotating cover in a matching way; inserting the left shaft end of the limit sleeve inserted into the inner hole of the sinking table on the inner side surface of the right rotating cover into the inner hole of the sinking table correspondingly opened on the inner side surface of the left rotating cover; the left shafts of the displacement power input gear and the displacement power transition gear are respectively inserted into the inner rings of the power input gear bearing and the displacement power transition gear bearing in the left shell in a matched manner; and the inner rings of the two displacement gear bearings arranged in the left shell are sleeved on the left shaft necks of the two positive and negative ball screw shafts in a matched manner.

After the left shell and the right shell are closed, the left shell and the right shell are fastened and fixed by bolts; after a third fixed key is inserted into an inner hole of a key slot of the displacement power input gear, radially restraining the stepping motor, the output shaft of the speed reducer and the displacement power input gear in a key connection mode, and fixing the stepping motor and the speed reducer on the outer side surface of the right shell by using 4 bolts; the relative positions between the left rotating cover and the right rotating cover are fixed on the two sides of the electrode coping cavity by 3 bolts, wherein the 3 bolts penetrate through the surface of the right rotating cover and the inner holes of the limiting sleeve.

The combined cutting tool comprises a plane cutting tool, a cambered surface cutting tool or a truncated cone-shaped cutting tool, a cutter shaft, an adjusting washer, a fourth fixed key and a rotation bearing; symmetrically loading the outer circle of the plane cutter into the inner hole of the rotation gear in an axial tight fit manner, and embedding the rectangular flange in the axial middle part of the cutter shaft into the axial rectangular through hole correspondingly formed in the middle part of the plane cutter; according to the principle that the rotation directions of the left and right rotary cutting edges respectively arranged on two sides of the plane cutting tool are consistent, respectively sleeving a cambered cutting tool or a round table cutting tool with the same rotation direction of the cutting edges on two sides of the cutter shaft, and radially restraining the two cambered cutting tools or the round table cutting tool with the cutter shaft by using a fourth fixed key; after an adjusting washer is embedded in each sinking table axially outside the two cambered surface cutting tools or the round table cutting tools, a pair of autorotation bearings are respectively arranged in parallel at the shaft neck positions of the shaft ends at the two sides of the cutter shaft.

Still include two sets of same stop gear, two sets stop gear mirror image divide and arranges in exposing on the positive and negative ball screw shaft of closure casing both sides, and every stop gear all includes positive and negative ball screw sleeve, backup pad, limiting plate, end cover, jackscrew and limiting plate mounting bolt, wherein:

respectively sleeving the sinking tables at the two ends of the two support plates outwards from the two sides of the closed shell at the overhanging ends of the two positive and negative ball screw shafts, respectively screwing a positive and negative ball screw sleeve matched with the screw thread in the screw thread direction at the end part of each positive and negative ball screw shaft 1, and respectively locking the relative positions of the positive and negative ball screw sleeves on the support plates by using a jackscrew; an end cover is fixedly arranged on the outer side surfaces of inner holes at two sides of each supporting plate respectively by using a limiting plate mounting bolt; the convex surfaces of the two pairs of limiting plates are respectively and fixedly installed on corresponding sinking tables arranged in the middle of the two supporting plates inwards by utilizing the limiting plate installation bolts.

The follow-up swing mechanism is fixedly arranged on the surface of the rear part of the outer side of the closed shell and used for balancing cutting stress on two sides in the electrode polishing process, and comprises a mounting plate, a support, a linear bearing, an optical axis, a clamp spring, a fixing plate and a pressure spring, wherein: fixedly mounting a mounting plate on the outer surface of the rear part of the closed shell; after the two supports are respectively and fixedly arranged on two sides of the mounting plate, the two optical axes pass through corresponding holes on one support from the outer side;

Then sequentially sleeving springs, linear bearings and springs on the two optical axes in sequence, and locking two groups of parts sleeved on the two optical axes between the inner surfaces of the two side supports by using two clamping springs after penetrating through corresponding holes on the other side supports; the fixing plate is tightly connected with the linear bearing by bolts.

The negative pressure chip suction system comprises a negative pressure suction nozzle, a negative pressure generator and a negative pressure pipeline, wherein the negative pressure suction nozzle is fixedly arranged on the surface of the outer side wall of one side of the closed shell, an inner hole of the negative pressure suction nozzle is communicated with a negative pressure channel in the closed shell, the end part of the negative pressure suction nozzle is connected with the negative pressure generator through the negative pressure pipeline, and grinding chips sucked out in real time through the negative pressure are led into a chip collection tank appointed by a user through a guide pipe after passing through the negative pressure channel in the closed shell, the negative pressure suction nozzle, the negative pressure pipeline and the negative pressure generator.

The invention has the following advantages and beneficial effects:

(1) The electrode is sharpened by the multi-edge combined cutting tool in a cutting mode, the cutting force is irrelevant to the electrode pressure, and compared with the mode of scraping, shaping and sharpening the electrode by means of the electrode pressure in the prior art, the service life of the cutting tool can be greatly prolonged.

(2) The multi-blade combined cutting tool adopts revolution and high-speed rotation mode to grind the electrode, and only carries out micro-positioning, moving, cutting and grinding aiming at a newly formed layer on the working surface of the electrode, thus being capable of extremely compressing unnecessary grinding amount in the prior art.

(3) The polished electrode working surface is a plane, and the electrode polishing angle automatic compensation function is provided, so that a good instant attaching effect of the electrode working plane and the workpiece surface in the spot welding process can be ensured, the feeding capacity of the electrode working surface is improved, and necessary conditions are created for improving the quality of welding spots and reducing the cost of a spot welding process.

Drawings

Fig. 1 is a schematic perspective view of an automatic electrode polishing device according to an embodiment of the present invention;

fig. 2 is a schematic left-view structural diagram of an electrode automatic coping device according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of a left-hand structure of the electrode automatic coping device according to the embodiment of the invention after no limiting mechanism is removed;

FIG. 4 is an enlarged cross-sectional schematic view of the structure of FIG. 2 in the direction A-A;

FIG. 5 is an enlarged sectional view schematically illustrating the structure in the direction B-B in FIG. 2;

FIG. 6 is an enlarged cross-sectional schematic view of the structure of FIG. 2 in the direction C-C;

FIG. 7 is a schematic axial sectional view of a combination tool in an automatic electrode sharpener according to an embodiment of the present invention;

FIG. 8 is a schematic axial cross-sectional view of a planar cutter in a cutter according to an embodiment of the present invention;

FIG. 9 is a schematic diagram of a radial cross-sectional configuration of a planar cutter in a cutter according to an embodiment of the present invention;

FIG. 10 is a schematic axial cross-sectional view of a cambered surface cutting tool in a cutting tool according to an embodiment of the invention;

FIG. 11 is a schematic diagram of a radial cross-sectional configuration of a cambered surface cutting tool in a cutting tool according to an embodiment of the invention;

FIG. 12 is a schematic axial cross-sectional view of a truncated cone-shaped blade in a blade according to an embodiment of the present invention;

FIG. 13 is a schematic view of a radial cross-sectional configuration of a truncated cone-shaped blade in a blade in accordance with an embodiment of the present invention;

FIG. 14 is an enlarged perspective view of a left housing member of the electrode self-polishing device according to the embodiment of the present invention;

FIG. 15 is an enlarged perspective view of a right housing member of the electrode self-polishing device according to the embodiment of the present invention;

FIG. 16 is an enlarged perspective view of a left turn cap in an electrode self-polishing machine according to an embodiment of the present invention;

FIG. 17 is an enlarged perspective view of a right turn cap in an electrode automatic coping machine according to an embodiment of the present invention;

fig. 18 is a schematic diagram of a front view structure of a spherical electrode according to an embodiment of the present invention;

fig. 19 is a schematic diagram of a front view of a truncated cone-shaped electrode according to an embodiment of the present invention.

The figures are labeled as follows:

1-a positive and negative ball screw shaft, 2-an end cover, 3-jackscrews, 4-a left shell and 5-a right shell;

6-supporting plates, 701-stepping motors, 702-speed reducers and 801-first fixing holes;

802-second fixing holes, 9-mounting plates, 10-power motors and 11-supports;

12-linear bearings, 13-optical axes, 14-snap springs, 15-fixing plates and 16-bolts;

17-negative pressure suction nozzles, 18-left rotary covers, 19-limit plate mounting bolts and 20-limit plates;

211-a first bearing cap bolt, 212-a second bearing cap bolt and 22-a cambered surface cutting tool;

231-first bearing cover, 232-second bearing cover, 24-cutter shaft and 25-plane cutter;

241-first mounting through holes; 242-second mounting through holes; 243-third mounting through holes;

26-a self-rotation gear, 27-a positioning pin, 28-a chip separation plate and 29-a chip separation plate screw;

30-adjusting washers, 31-autorotation bearings, 321-first electrode positioning holes;

322-second electrode positioning holes, 33-revolution gear bearings, 331-first revolution gear bearing mounting grooves;

332-a second revolution gear bearing mounting groove, 34-a power transition gear bearing;

35-power transition gear, 36-power input gear bearing, 37-power input gear;

38-a first fixed key, 39-a power motor mounting seat, 40-a tooth protecting plate and 41-a revolution gear;

42-a limit sleeve, 43-a right rotating cover, 431-a left rotating cover mounting hole, 432-a left rotating cover mounting hole;

44-revolution gear bolts, 440-revolution gear connecting holes and 45-fixed gear rings;

46-synchronous gear bearing, 461-first connecting groove, 462-second connecting groove; 47-synchronous gears, 48-positive and negative ball screw sleeves and 49-displacement gear bearings;

491-first bearing mounting groove 492-first bearing mounting groove, 50-second securing key;

51-displacement gear, 52-displacement power transition gear bearing, 521-first fixed groove;

522-first fixed groove, 53-third fixed key, 54-displacement power input gear bearing;

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

56-displacement power transition gear, 57-fourth fixed key, 58-round table shaped cutting tool;

591-a first bolt fixing hole, 592-a second bolt fixing hole, 601-a first negative pressure groove;

602-a second negative pressure groove, 61-a stepper motor fixing bolt and 62-a spherical electrode; 63-a circular truncated cone-shaped electrode; 641-a first plane; 642-a second plane; 651-first side; 652-second side.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

The invention relates to an automatic electrode grinding device used on electrode holding rods of machine arms on two sides of various automatic welding tongs in a resistance spot welding process. The automatic electrode grinding device adopts a multi-blade combined cutting tool to grind an electrode in a cutting mode of revolution and high-speed autorotation without electrode pressure in the electrode grinding process, and the surface of the ground electrode working end is a plane; the positioning and cutting mechanism is used for controlling the cutting amount and the compensation amount of the electrode working angle change during each grinding of the electrode, so that the accurate control of the electrode grinding amount can be realized, the unnecessary cutting amount can be extremely compressed, and the dynamic compensation can be implemented on the electrode working angle change. The working characteristics of the invention jointly determine the characteristics of long service life of the cutting tool, high effective utilization rate of electrode materials, good feeding effect of the ground electrode surface in the spot welding process and the like, and can achieve remarkable positive effects in the aspects of reducing consumption of the cutting tool and the electrode materials, reducing the electrode replacement times, reducing the spot welding process cost, improving the welding spot quality and the like.

The invention relates to an automatic grinding device for a resistance spot welding electrode, which comprises the following steps:

(1) The method is characterized in that an electrode sharpening mode of carrying out micro-cutting-capacity positioning and moving cutting by revolution and high-speed autorotation and without electrode pressure is established, the sharpening mode of the working end face of the electrode in the prior art is changed from a sharpening principle of single-edge spherical surface scraping or scraping shaping to a multi-edge plane cutting sharpening principle, and the adverse properties of short service life of the cutting tool, overlarge proportion of unnecessary sharpening quantity of the electrode in each sharpening and the like and the property of low power feeding capacity to a welding part in the prior electrode sharpening technology are overcome.

(2) The dynamic compensation function of the electrode grinding angle is introduced, so that the attaching state of the electrode working plane and the workpiece surface is not influenced by negative effects caused by incremental change of the angle of the electrode working axis, and necessary conditions are created for improving the quality of welding spots, reducing the cost of a spot welding process and the like.

The invention will be further described with reference to the drawings and specific examples.

As shown in fig. 1 to 19: the embodiment of the invention provides an automatic coping device for a resistance spot welding electrode, which comprises a closed shell formed by a left shell 4 and a right shell 5 which are in mirror image relation in appearance, wherein a mechanical structure main body part for realizing the functions of electrode coping, cutting displacement control, electrode coping angle compensation and the like of the invention is arranged in the closed shell; the follow-up swing mechanism for balancing cutting stress on two sides in the electrode grinding process is fixedly arranged on the rear surface of the outer side of the closed shell; the negative pressure generator in the negative pressure chip suction system is fixedly arranged on the equipment bracket, and the negative pressure suction nozzle in the negative pressure chip suction system is fixedly arranged on the surface of the lateral wall of the outer side of the closed shell; when the electrode is polished, the working end parts of the electrodes on the holding rods of the arms at the two sides of the welding tongs, namely the working end parts of the spherical electrode 62 or the truncated cone-shaped electrode 63, are synchronously polished through the cooperative cooperation among the main body part of the mechanical structure, the follow-up swinging mechanism and the negative pressure chip sucking system; wherein, the power motor 10, the power motor mounting seat 39, the stepping motor 701, the speed reducer 702 and the like in the mechanism are fixedly arranged 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 out of the two side surfaces of the closed shell.

As shown in fig. 1 to 4, the mechanical structure main body part comprises a set of electrode polishing mechanism, wherein the electrode polishing mechanism comprises a polishing power driving device and two sets of electrode polishing devices which are respectively arranged in a closed shell; the grinding power driving device of the electrode grinding mechanism comprises 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, a first fixed key 38 and the like; after the outer rings of the two power input gear bearings 36 and the two power transition gear bearings 34 are respectively matched and installed in corresponding bearing holes formed on the right shell 5 and the power motor mounting seat 39, the left shafts of the power input gear 37 and the power transition gear 35 are matched and inserted into the inner rings of the power input gear bearings 36 and the power transition gear bearings 34 which are already arranged in the right shell 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 matched and inserted into the key slot arranged between the output shaft end of the power motor 10 and the power input gear 37, the power motor 10 and the mounting seat 39 thereof are fixed on the outer side surface of the right shell 5 by bolts.

As shown in fig. 4 to 12, the two sets of electrode grinding devices are coaxially arranged in the closed shell at two sides of the joint surface of the left shell 4 and the right shell 5, and respectively bear grinding of the working ends of the spherical electrode 62 or the truncated cone-shaped electrode 63 at two sides in working; the electrode grinding device comprises a revolution gear 41, a left rotary cover 18, a right rotary cover 43, a revolution 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 separating plate 28, a tooth protecting plate 40, bolts, screws and the like; the inner rings of the two revolution gear bearings 33 are respectively and tightly matched and installed on corresponding annular countersunk platforms arranged on the inner surfaces of the outer circles of the left rotating cover 18 and the right rotating cover 43, and the two chip separating plates 28 are respectively fixed on the inner surfaces of the left rotating cover 18 and the right rotating cover 43 by 6 screws 29, so that grinding chips between the two revolution gear bearings 33 and an electrode grinding chamber during electrode grinding are shielded; the first bearing cap 231 and the second bearing cap 232 are respectively and fixedly installed in corresponding sinking tables formed on the outer side surfaces of the left rotating cap 18 and the right rotating cap 43 by 4 bolts; the left rotary cover 18 is arranged in a left rotary cover mounting hole 431 formed on the left shell 5, the right rotary cover 43 is arranged in a right rotary cover mounting hole 432 formed on the right shell 5, and in the arranging process, the outer ring of the revolution gear bearing 33 assembled on the left rotary cover is tightly matched and arranged in a second revolution gear bearing hole 332 correspondingly formed on the right shell 5 and a first revolution gear bearing hole 331 correspondingly formed on the left shell 4; after the revolution gear 41 is fastened and assembled to the outer side surface of the right turn cover 43 through the revolution gear coupling hole 440 by 4 revolution gear bolts 44, the tooth guard 40 is fixed to the annular counter plate of the outer side surface of the revolution gear 41 by 6 screws; the fixed gear ring 45 is tightly matched and installed in a counter hole which is correspondingly formed on the inner side of the right shell 5 in the axial direction at the left side; the rotation bearing 31 at one end of the combined cutting tool is tightly matched and inserted into the bearing mounting hole of the right bearing cover 23, and the rotation gear 26 on the combined cutting tool is meshed with the fixed gear ring 45; one end of the 3 limiting sleeves 42 are respectively inserted into 3 corresponding counter sinking holes formed on the inner side surface of the right rotating cover 43.

As shown in fig. 5, 6, 14 and 15, the mechanical structure main body part of the present invention further comprises a cutting displacement control mechanism, wherein the cutting displacement control mechanism respectively bears the cutting displacement control and the electrode grinding angle compensation when the working end of the spherical electrode 62 or the working end of the truncated cone-shaped electrode 63 is grinded; the cutting displacement control mechanism comprises a grinding power driving device and two sets of cutting displacement control mechanisms; the grinding power driving device of the cutting displacement control mechanism comprises a stepping motor 701, a speed 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, a synchronous gear bearing 46 and the like; the cutting displacement control mechanism comprises a displacement gear 51, a positive and negative ball screw shaft 1, a positive and negative ball screw sleeve 48, a second fixed key 50, a displacement gear bearing 49, a limiting mechanism, a jackscrew 3 and the like; after the inner ring of the synchronous gear bearing 46 is tightly matched and installed on an annular sinking table of the outer circle of the fixed gear ring 45, taking a flange on the outer ring of the synchronous gear 47 as a limit, tightly matching and sleeving an inner hole of the synchronous gear 47 on the outer ring of the synchronous gear bearing 46; after the outer rings of the pair of alignment shifting force input gear bearings 54, the pair of alignment shifting force transition gear bearings 52 and the shift gear bearings 49 are respectively fitted into the corresponding first mounting grooves 541, second mounting grooves 542, first fixing grooves 521, second fixing grooves 522, first bearing mounting grooves 491 and second bearing mounting grooves 492, respectively, which are opened in the left housing 4 and the right housing 5, the right journals of the shift power input gear 55 and the shift power transition gear 56 are respectively fitted into the inner rings of the corresponding bearings in the right housing 5, and the shift power transition gear 56 is respectively engaged with the shift power input gear 55 and the synchronizing gear 47; taking convex rings on the right sides of the two positive and negative ball screw shafts 1 as limiting positions, and respectively inserting the shaft necks at the right ends of the convex rings into the inner rings of two displacement gear bearings 49 arranged in the right shell 5 in a matched manner; a second fixed key 50 is inserted into a keyway between the two forward and reverse ball screw shafts 1 and the two displacement gears 51.

After the assembly is completed, the left rotary cover 18 is combined and inserted into a left rotary cover insertion hole 18 formed on the left shell 4; closing the left housing 4 and the right housing 5; in the closing process of the left shell 4 and the right shell 5, the following operations are synchronously completed: firstly, the outer ring of the rotary bearing 31 on the left side of the combined cutter is inserted into the inner hole of the assembled bearing cover 23 on the left rotary cover 18 in a matching way; secondly, inserting the left shaft end of the limiting sleeve 42 into a sinking table inner hole correspondingly formed in the inner side surface of the left rotary cover 18; thirdly, the left shafts of the displacement power input gear 55 and the displacement power transition gear 56 are respectively matched and inserted into the inner rings of the power input gear bearing 54 and the displacement power transition gear bearing 52 which are already arranged in the left shell 4; fourth, the inner rings of the two-shift gear bearings 49 placed in the left housing 4 are fitted over the left journals of the two forward and reverse ball screw 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 by fastening bolts; after the third fixed key 53 is inserted into the key slot of the displacement power input gear 55, the output shaft of the speed reducer 702 and the displacement power input gear 55 are radially restrained in a key connection mode, and the stepping motor 701 and the speed reducer 702 are fixed on the outer side surface of the right shell 5 by using 4 connecting bolts; the relative positions between the left and right rotary covers 18 and 43 are fixed at the two sides of the electrode grinding chamber by 3 fixing bolts through 3 bolt insertion holes 16 formed on the surface of the right rotary cover 43 and the inner holes on the limiting sleeve 42 in sequence.

As shown in fig. 4 to 12, the invention further comprises a set of combined cutting tools, wherein the combined cutting tools comprise a plane cutting tool 25, an arc surface cutting tool 22 or a round table cutting tool 58, a cutter shaft 24, an adjusting washer 30, a fourth fixed key 57, a rotation bearing 31 and the like; symmetrically loading the outer circle of the plane cutter 25 into the inner hole of the rotation gear 26 in an axial tight fit manner, and embedding a rectangular flange in the axial middle part of the cutter shaft 24 into an axial rectangular through hole correspondingly formed in the middle part of the plane cutter 25; according to the principle that the rotation directions of the left and right rotary cutting edges respectively arranged on two sides of the plane cutting tool 25 are consistent, respectively sleeving cambered cutting tools 22 or round table-shaped cutting tools 58 with the same rotation directions of the cutting edges on two sides of the cutter shaft 24, and radially restraining the two cambered cutting tools 22 or round table-shaped cutting tools 58 and the cutter shaft 24 by using a fourth fixing key 57; after an adjusting washer 30 is respectively embedded in the sinking tables axially outside the two cambered surface cutting tools 22 or the round table type cutting tools 58, a pair of rotation bearings 31 are respectively arranged in parallel at the shaft neck positions of the shaft ends at the two sides of the cutter shaft 24.

As shown in fig. 8 and 9, the planar cutter 25 has a shape structure of a thin-wall ring with symmetrical convex rings at two axial sides of the outer circumference, and a rectangular through hole which is in clearance fit with a rectangular flange arranged in the middle of the cutter shaft 24 is axially arranged at the center of the thin-wall ring; the surfaces of the convex rings on the two axial sides are planes which are parallel to each other, and positive and negative rotating cutting edges are respectively arranged on the surfaces; when the spherical electrode 62 or the circular truncated cone electrode 63 is sharpened, the rotation planes of the cutting edges on both sides of the plane cutter 25 are always attached to the working end planes 64 of the spherical electrode 62 or the circular truncated cone electrode 63 to be sharpened on both sides, and only the first plane 641 of the working end of the spherical electrode 62 on both sides or the second plane 642 of the working end of the circular truncated cone electrode 63 are sharpened.

As shown in fig. 10 to 12, the cambered surface cutting tool 22 or the circular truncated cone-shaped cutting tool 58 is named according to the shape of the cutting edge in the axial section of the cambered surface cutting tool 22 or the circular truncated cone-shaped cutting tool 58, and the center of the cambered surface cutting tool 22 or the circular truncated cone-shaped cutting tool is provided with an axial through hole matched with the diameter of the cutter shaft 24 and a key groove matched with the key 57; the electrodes used in production comprise two types of spherical electrodes 62 and circular truncated cone electrodes 63, and the selection of the cambered surface cutting tool 22 or the circular truncated cone cutting tool 58 in the combined cutting tool is determined by the requirement of a user on the side surface shape of the working end of the electrode; the arc surface radius R of the cutting edge of the arc surface cutting tool 22 is equal to the arc surface radius R of the side surface of the spherical electrode 62 to be polished, and is determined by the surface shape requirement of a user after the electrode is polished; the cone angle alpha of the truncated cone-shaped cutting tool 58 is also determined by the surface shape requirement of a user after electrode grinding; when the combined cutting tool is assembled, the cutting edges of the cambered surface cutting tools 22 or the round table-shaped cutting tools 58 on two sides rotate in the same direction as the cutting edges on the same side of the plane cutting tools 25 positioned in the middle of the cutter shaft 24; when the electrode is sharpened, the cutting edges of the cambered surface cutting tool 22 or the round table-shaped cutting tool 58 only grind the first side 651 on both sides of the working end part of the spherical electrode 62 to be sharpened or the second side 652 on both sides of the working end part of the round table-shaped electrode 63. Meanwhile, the plane cutter 25 is mounted on the cutter shaft 24 through a first mounting through hole 241 provided thereon; the cambered surface cutting tool 22 is arranged on the cutter shaft 24 through a second mounting through hole 242 arranged on the cambered surface cutting tool; the circular truncated cone shaped blade 58 is mounted on the arbor 24 by a third mounting aperture 243 provided therein.

The plane cutting tool 25, the cambered surface cutting tool 22 and the round table cutting tool 58 are formed milling cutters with different shapes in nature, and the cutting edge parameters are the same as the corresponding parameters of the similar milling cutters; the number of teeth n1, n2 or n3 processed on the plane cutter 25, the cambered surface cutter 22 and the circular truncated cone cutter 58 is determined by the diameters of the corresponding cutters, and when the diameters of the spherical electrode 62 or the circular truncated cone electrode 63 are increased, the diameters of the cutters and the number of the cutting edges are correspondingly increased.

The embodiment of the invention provides an automatic coping device for a resistance electric welding electrode, which also comprises two sets of identical limiting mechanisms, wherein the two sets of limiting mechanisms are arranged on a positive and negative ball screw shaft 1 which is exposed out of two sides of a closed shell in a mirror image manner, and each set of limiting mechanism comprises a positive and negative ball screw sleeve 48, a supporting plate 6, a limiting plate 20, an end cover 2, a jackscrew 3, a limiting plate mounting bolt 19 and the like; respectively sleeving the sinking tables at the two ends of the two support plates 6 outwards from the two sides of the closed shell at the overhanging ends of the two positive and negative ball screw shafts 1, respectively screwing a positive and negative ball screw sleeve 48 with matched screw direction at the end part of each positive and negative ball screw shaft 1, and respectively locking the relative positions of the positive and negative ball screw sleeves 48 on the support plates 6 by using a jackscrew 3; an end cover 2 is fixedly arranged on the outer side surfaces of inner holes on two sides of each supporting plate 6 respectively by using a limiting plate mounting bolt 19; the convex surfaces of the two pairs of limiting plates 20 are respectively and fixedly installed on corresponding sinking tables arranged in the middle of the two supporting plates 6 inwards by utilizing limiting plate installation bolts 19; during operation, the two sets of limiting mechanisms respectively bear the positioning of the grinding reference and the grinding angle compensation and the like during the grinding of the electrodes at the two sides.

As shown in fig. 1 to 3, the present invention further includes a set of follow-up swing mechanism fixedly installed on the rear outer side surface of the closed casing through the installation plate 9, the follow-up swing mechanism including the installation plate 9, the support 11, the linear bearing 12, the optical axis 13, the snap spring 14, the fixing plate 15, a compression spring, which is not shown in the drawings, and the like. Fixedly mounting a mounting plate 9 on the rear outer side surface of the closed shell; after the two supports 11 are respectively and fixedly arranged on two sides of the mounting plate 9, the two optical axes 13 pass through corresponding holes on one side support 11 from the outer side, then spring-linear bearings 12-springs are respectively sleeved on the two optical axes 13 in sequence, and after the two optical axes pass through corresponding holes on the other side support 11, two groups of parts sleeved on the two optical axes 13 are locked between the inner surfaces of the two side supports 11 by two clamping springs 14; the fixing plate 15 is fastened and connected with the linear bearing 12 by bolts.

As shown in fig. 1, 2, 3 and 11, the present invention further includes a negative pressure chip suction system, which includes: negative pressure suction nozzle 17, negative pressure generator and negative pressure pipeline etc.. The negative pressure suction nozzle 17 is fixedly installed on the surface of one side outer side wall of the closed shell by using 2 first

bolt fixing holes

591 and 2 second bolt fixing holes 592, the inner holes of the negative pressure suction nozzle are communicated with a negative pressure channel formed by a first negative pressure groove 601 and a second negative pressure groove 602 which are respectively arranged on the left shell 4 and the right shell 5, and the outer sides of the negative pressure suction nozzle are connected with a negative pressure generator through a negative pressure pipeline. The negative pressure generator is a commercial standard component and is fixedly arranged on the equipment bracket; the grinding chip sucked out in real time by the negative pressure is led into the chip collecting tank appointed by a user through the guide pipe after passing through the negative pressure channel, the negative pressure suction nozzle 17, the negative pressure pipeline and the negative pressure generator in the closed shell.

As shown in fig. 11, the shape and the structure of the left shell 4 and the right shell 5 are mirror images; except that the mounting holes of the power input gear bearing 36 and the power transition gear bearing 34, etc. exist only on the right housing 5, the other process holes exist correspondingly in both the left housing 4 and the right housing 5.

As shown in fig. 12, due to the independent assembly relationship between the right-turn cover 43 and the revolution gear 41 and the need of adding the tooth protecting plate 40 outside the revolution gear 41, the process holes and the assembly sinking table are in mirror image relationship except that 4 bolt holes and diameters used when the right-turn cover 43 is assembled with the revolution gear 41 and the right-turn cover 43 are slightly smaller than those of the left-turn cover 18.

The bearing cover 23 in the electrode grinding mechanism of the invention is fixedly arranged inside and outside corresponding sinking tables arranged on the outer surfaces of the left rotating cover 18 and the right rotating cover 43 respectively by 4 bolts, and two positioning pins 27 are respectively matched on the bearing cover after confirming that the grinding result of the working end part of the grinded spherical electrode 62 or the round table electrode 63 meets the requirement.

Fig. 18 to 19 respectively show two types of electrodes used in production, including a spherical electrode 62 and a truncated cone electrode 63, wherein the selection of the cambered surface cutting tool 22 and the truncated cone cutting tool 58 in the electrode automatic sharpening device is determined by the requirement of the production site on the appearance of the spherical electrode 62 or the truncated cone electrode 63 used.

The working process of the electrode grinding device is as follows:

when the electrode holder carries the spherical electrode 62 or the truncated cone-shaped electrode 63 to be polished to the electrode polishing position, the lower end surfaces of the electrode holding rods at two sides are in contact with the upper surfaces of the limiting plates 20 at two sides on the cutting displacement mechanism to limit the positions, and the accurate positioning is realized by the contact between the first electrode positioning holes 321 arranged on the left rotary cover 18 and the second electrode positioning holes 322 arranged on the right rotary cover 43 and the first electrode working end side 651 and the second electrode working end side 652 to be polished in the radial direction. After the automatic grinding device receives an in-place instruction of the spherical electrode 62 or the truncated cone-shaped electrode 63 sent by the robot, the power motor 10 of the automatic grinding device is started, and the rotating power is transmitted to the revolution gear 41 through the power input gear 37 and the power transition gear 35; when the revolution gear 41 rotates, the left rotating cover 18 and the right rotating cover 43 are driven to synchronously rotate through the connecting bolts and the limiting sleeves 42, and the cutting tool arranged between the left rotating cover 18 and the right rotating cover 43 is driven to synchronously rotate along with the revolution gear 41; because the rotation gear 31 is meshed with the fixed gear ring 45 at the same time, the combined cutting tool rotates by taking the cutter shaft 24 as the shaft according to the higher working rotation speed according to the gear ratio relation between the fixed gear ring 45 and the rotation gear 31, thereby forming the working characteristics of revolution and high-speed rotation of the electrode automatic grinding tool cutting tool in the electrode grinding process.

After the power motor 10 reaches the working rotation speed, the stepping motor 701 starts to work; after the shaft ends of the output shafts of the stepping motors 701 pass through the displacement power input gears 55, the displacement power transition gears 56 and the synchronizing gears 47, rotary power is synchronously transmitted to two displacement gears 51 which are arranged at two sides of the synchronizing gears 47 in a mirror image manner and meshed with the two displacement gears 51, and the two forward and reverse ball threaded shafts 1 are driven to synchronously rotate by the second fixed keys 50; in the synchronous rotation process of the two positive and negative ball screw shafts 1, the two pairs of positive and negative ball screw sleeves 48 with positive and negative screw threads on the two shaft ends of the two positive and negative ball screw shafts 1 can only move linearly in opposite directions along the axial direction of the two positive and negative ball screw shafts 1 and drive the two side support plates 6 to move synchronously in opposite directions, meanwhile, the spherical electrode 62 or the round table electrode 63 to be polished is gradually attached to the cutting edge of the combined cutting tool along with the limiting plates 20 on the two side support plates 6 from two sides, the grinding process of the working end part of the spherical electrode 62 or the round table electrode 63 starts to enter, and the axial feeding speed of the spherical electrode 62 or the round table electrode 63 to be polished, namely the cutting grinding speed in the electrode grinding process is determined by the rotating speed of the stepping motor 701; 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 for the next electrode grinding instruction in situ.

When the spherical electrode 62 or the round table electrode 63 is slowly fed into the grinding process, a dynamically changing dip angle exists between the axes of the spherical electrode 62 or the round table electrode 63 on two sides and the axes of the first electrode positioning hole 321 and the second electrode positioning hole 322 of the automatic grinding device all the time, and in most cases, the dip angles on two sides are not consistent, so that the cutting stress is different when the grinding electrodes on two sides are ground; when the cutting stress is different at two sides, the follow-up swinging mechanism drives the whole working end of the automatic electrode grinding device to swing slightly in real time according to the direction of the stress gradient so as to balance the cutting stress when the electrodes at two sides are cut and ground.

The electrode coping angle compensation function is finished simultaneously by a cutting displacement control function mechanism: when the support plates 6 which are respectively arranged at the two sides of the closed shell move the coping electrode along the axial direction of the positive and negative ball screw shaft 1 in opposite directions, the inclination angle of the electrode holding rod is necessarily changed, and the electrode coping angle compensation function is to form a logic corresponding relation between the increment of the axial displacement of the electrode and the increment of the axial inclination angle change of the electrode in the electrode coping process by utilizing the program controllability of the stepping motor 701, so that the aim of synchronously realizing incremental compensation of the electrode coping angle in the positioning and moving cutting process is fulfilled.

The negative pressure generator and the power motor 10 work according to the same control instruction; the chambers enclosed between the inner surfaces of the left rotating cover 18 and the right rotating cover 43 and the inner surface of the fixed gear ring 45 are electrode grinding chambers, the electrode grinding chambers are communicated with negative pressure channels formed by a first negative pressure groove 601 and a second negative pressure groove 602 which are respectively arranged on the inner sides of the left shell 4 and the right shell 5, and the cuttings generated during electrode grinding can be immediately sucked out of a closed shell formed by the left shell 4 and the right shell 5 of the automatic grinding device through a negative pressure suction nozzle 17.

After finishing electrode polishing, when the arms on two sides of the welding tongs carry polished electrodes to withdraw from the automatic polishing device from two sides of the closed shell according to the control command, the robot simultaneously sends out a signal command that the spherical electrode 62 or the round table-shaped electrode 63 is separated from the automatic polishing device, the power motor 10 and the negative pressure generator of the automatic electrode polishing device also simultaneously stop working, and wait for the next electrode polishing command. So far, the electrode grinding mechanism and the positioning and cutting mechanism cooperate to complete a complete electrode grinding working cycle.

The automatic electrode polishing device for the electric resistance welding electrode, which is provided by the embodiment of the invention, is fixedly arranged on a bracket by utilizing the fixing plate 15 when being arranged. The electrode grinding device is arranged on a support frame, and the electrode grinding device is arranged on the support frame.

In summary, the invention realizes the grinding of the working end part of the spherical electrode 62 or the round table electrode 63 to be ground without the aid of electrode pressure and by utilizing the electrode grinding mode of revolution and high-speed rotation of the multi-edge combined cutting tool, and overcomes various negative attribute problems caused by the cutting tool structural type and cutting tool cutting principle in the prior art; the positioning and cutting mechanism creates conditions for positioning, moving, cutting and grinding electrodes of the multi-edge combined cutting tool under the condition of micro-cutting-tool-taking, so that the cutting stress of the cutting tool is reduced suddenly, and unnecessary grinding amount in the prior art is extremely compressed; the electrode coping angle compensation device provides real-time guarantee for the attachment state of the electrode working surface and the workpiece surface during spot welding operation. The implementation of the technical measures can sharply reduce the cutting load of the cutting edge of the cutting tool, and greatly improve the service life of the cutting tool and the utilization rate of electrode materials; under the same technological conditions, the real-time guarantee of the contact state of the electrode working plane and the workpiece surface in the spot welding process also provides basic guarantee conditions for the aspects of improving the electrode feeding efficiency, reducing the spot welding process energy consumption, guaranteeing the welding spot quality and the like.

Finally, it should be noted that: the embodiments described above are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced with equivalents; such modifications and substitutions do not depart from the spirit of the invention.

Claims

1. An automatic coping device for a resistance spot welding electrode, characterized by: the electrode grinding device comprises a closed shell consisting of a left shell and a right shell which are in mirror image relation in appearance, wherein a mechanical structure main body part for realizing functions of electrode grinding, cutting displacement control and grinding angle compensation is arranged in the closed shell; the follow-up swinging mechanism for adjusting and balancing cutting stress on two sides in the electrode grinding process is fixedly arranged 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 is fixedly arranged on the equipment bracket, and the negative pressure suction nozzle in the negative pressure chip suction system is fixedly arranged on the surface of the lateral wall of the outer side of the closed shell; during electrode coping, through cooperation between mechanical structure main part, follow-up swing mechanism, the negative pressure chip suction system, the coping of the working end of electrode on the horn holding rod of welding tongs both sides is accomplished in step, mechanical structure main part includes electrode coping mechanism, wherein:

the electrode polishing mechanism comprises a polishing power driving device and two sets of electrode polishing devices, wherein the two sets of electrode polishing devices are coaxially arranged in the closed shell, and the polishing power driving device is fixedly arranged on the outer surface of one side of the closed shell and is used for driving the two sets of electrode polishing devices to polish the upper electrode working ends of the arm holding rods at two sides of the welding pliers;

2. The automatic coping machine for resistance spot welding electrode of claim 1, wherein the coping power driven means comprises a power motor, a power motor mount, a power input gear, a power transition gear, a power input gear bearing, a power transition gear bearing, and a first stationary key; and respectively matching the outer rings of the two power input gear bearings and the two power transition gear bearings into corresponding bearing holes formed in the right shell and the power motor mounting seat.

3. The automatic coping apparatus for resistance spot welding electrode according to claim 2, wherein the left shafts of the power input gear and the power transition gear are fitted into the inner rings of the power input gear bearing and the power transition gear bearing that have been placed in the right housing, and the power input gear and the power transition gear are engaged with each other; after the first fixed key is matched and inserted into a key slot arranged between the output shaft end of the power motor and the power input gear, the power motor and the mounting seat thereof are fixed on the outer side surface of the right shell by bolts.

4. The automatic resistance spot welding electrode grinding device according to claim 1, wherein the mechanical structure main body part further comprises a cutting displacement control mechanism, the cutting displacement control mechanism respectively bears cutting displacement control and electrode grinding angle compensation work when grinding the working end part of the electrode, the cutting displacement control mechanism comprises a displacement gear, a positive and negative ball screw shaft, a positive and negative ball screw sleeve, a second fixed key, a displacement gear bearing, a limiting mechanism and a jackscrew, after the inner ring of the synchronous gear bearing is tightly matched and installed on an annular sinking table of the outer circle of the fixed gear ring, the inner hole of the synchronous gear is tightly matched and sleeved on the outer ring of the synchronous gear bearing by taking a flange on the outer ring of the synchronous gear as a limit;

after the assembly is completed, the left rotary cover is put into a corresponding rotary cover insertion hole opened in the left housing, and a chip separation plate is fixed on the inner side surface of the left rotary cover by using 6 screws.

5. The self-repairing grinder for resistance spot welding electrodes according to claim 1, wherein the left and right housings are closed, and the following operations are simultaneously performed during the closing process: the outer ring of the self-rotating bearing on the left side of the combined cutting tool is inserted into the inner hole of the bearing cover on the left rotating cover in a matching way; inserting the left shaft end of the limit sleeve inserted into the inner hole of the sinking table on the inner side surface of the right rotating cover into the inner hole of the sinking table correspondingly opened on the inner side surface of the left rotating cover; the left shafts of the displacement power input gear and the displacement power transition gear are respectively inserted into the inner rings of the power input gear bearing and the displacement power transition gear bearing in the left shell in a matched manner; and the inner rings of the two displacement gear bearings arranged in the left shell are sleeved on the left shaft necks of the two positive and negative ball screw shafts in a matched manner.

6. The self-repairing grinder for resistance spot welding electrodes according to claim 5, wherein after the left and right housings are closed, the left and right housings are fastened and fixed with bolts; after a third fixed key is inserted into an inner hole of a key slot of the displacement power input gear, radially restraining the stepping motor, the output shaft of the speed reducer and the displacement power input gear in a key connection mode, and fixing the stepping motor and the speed reducer on the outer side surface of the right shell by using 4 bolts; the relative positions between the left rotating cover and the right rotating cover are fixed on the two sides of the electrode coping cavity by 3 bolts, wherein the 3 bolts penetrate through the surface of the right rotating cover and the inner holes of the limiting sleeve.

7. The automatic sharpening device for resistance spot welding electrodes according to claim 5, wherein the combined cutting tool comprises a planar cutting tool, a cambered cutting tool or a truncated cone-shaped cutting tool, a cutter shaft, an adjusting washer, a fourth fixed key and a self-rotating bearing; symmetrically loading the outer circle of the plane cutter into the inner hole of the rotation gear in an axial tight fit manner, and embedding the rectangular flange in the axial middle part of the cutter shaft into the axial rectangular through hole correspondingly formed in the middle part of the plane cutter; according to the principle that the rotation directions of the left and right rotary cutting edges respectively arranged on two sides of the plane cutting tool are consistent, respectively sleeving a cambered cutting tool or a round table cutting tool with the same rotation direction of the cutting edges on two sides of the cutter shaft, and radially restraining the two cambered cutting tools or the round table cutting tool with the cutter shaft by using a fourth fixed key; after an adjusting washer is embedded in each sinking table axially outside the two cambered surface cutting tools or the round table cutting tools, a pair of autorotation bearings are respectively arranged in parallel at the shaft neck positions of the shaft ends at the two sides of the cutter shaft.

8. The automatic coping machine for resistance spot welding electrodes of claim 1, further comprising two identical sets of stop mechanisms mirror-imaged onto the forward and reverse ball threaded shafts exposing both sides of the closed housing, each set of stop mechanisms comprising a forward and reverse ball threaded sleeve, a support plate, a stop plate, an end cap, a jackscrew, and a stop plate mounting bolt, wherein:

respectively sleeving the sinking tables at the two ends of the two support plates outwards from the two sides of the closed shell at the overhanging ends of the two positive and negative ball screw shafts, respectively screwing a positive and negative ball screw sleeve with matched screw rotation directions at the end part of each positive and negative ball screw shaft, and respectively locking the relative positions of the positive and negative ball screw sleeves on the support plates by using a jackscrew; an end cover is fixedly arranged on the outer side surfaces of inner holes at two sides of each supporting plate respectively by using a limiting plate mounting bolt; the convex surfaces of the two pairs of limiting plates are respectively and fixedly installed on corresponding sinking tables arranged in the middle of the two supporting plates inwards by utilizing the limiting plate installation bolts.

9. The automatic resistance spot welding electrode repairing machine according to claim 1, wherein the follow-up swinging mechanism is fixedly installed on the rear surface of the outer side of the closed shell and used for balancing cutting stress on two sides in an electrode repairing process, and comprises a mounting plate, a support, a linear bearing, an optical axis, a clamp spring, a fixing plate and a pressure spring, wherein: fixedly mounting a mounting plate on the outer surface of the rear part of the closed shell; after the two supports are respectively and fixedly arranged on two sides of the mounting plate, the two optical axes pass through corresponding holes on one support from the outer side;

10. The automatic grinding device for resistance spot welding electrodes according to claim 1, wherein the negative pressure chip sucking system comprises a negative pressure suction nozzle, a negative pressure generator and a negative pressure pipeline, the negative pressure suction nozzle is fixedly arranged on the surface of the outer side wall of one side of the closed shell, an inner hole of the negative pressure suction nozzle is communicated with a negative pressure channel in the closed shell, the end part of the negative pressure suction nozzle is connected with the negative pressure generator through the negative pressure pipeline, and grinding chips sucked out in real time by negative pressure are led into a chip collecting tank appointed by a user through a conduit after passing through the negative pressure channel in the closed shell, the negative pressure suction nozzle, the negative pressure pipeline and the negative pressure generator.