168results about "Electrode features" patented technology

The application discloses an asymmetric ring electrode cap, discards the traditional two-side uniform spherical electrode design, and adopts an asymmetric ring electrode structure, specifically, the welding end face diameter of a thin plate side electrode cap is 6-14 mm, the curvature radius is 40-100 mm, three rings are arranged, the inner ring is provided with a conical pit, and the middle ring is in the shape of an isosceles trapezoid; the welding end face diameter of a thick plate side electrode cap is not less than that of the thin plate side and not more than 14 mm, the curvature radius is not less than that of the thin plate side and not more than 100 mm, three rings are also arranged, the inner ring is provided with a conical pit, and the middle ring is in the shape of an equilateral triangle. The ring structure parameters of the two electrode caps are accurately designed to adapt to the welding requirements of plates with different thicknesses, and the welding quality and efficiency are improved. The application is particularly suitable for resistance spot welding of materials such as aluminum workpieces with large thickness ratios.

The utility model discloses a modularized projection welding electrode, which belongs to the technical field of projection welding electrodes, and comprises an electrode main body and a connecting seat, a first mounting groove and a second mounting groove are arranged in the connecting seat, a connecting handle is fixed on the top surface of the electrode main body, a connecting rod is fixed at the upper end of the connecting handle, and the connecting rod is connected with the first mounting groove and the second mounting groove. A clamping groove is formed in the outer side of the connecting rod, a movable sleeve is slidably connected to the inner side of the second mounting groove, the upper end of the connecting rod is matched with the inner side of the movable sleeve in an inserted connection mode, a plurality of first buckles are fixed to the bottom face of the movable sleeve, and two second buckles are fixed to the top face of the movable sleeve. The upper ends of the two second buckles are each provided with an inclined face, and two movable grooves are formed in the upper portion of the outer side of the connecting base. According to the utility model, the electrode main body can be quickly dismounted and mounted, and the problems that the connection through threads needs to be frequently screwed in the mounting and dismounting process, and the process is relatively inconvenient are solved.

An electrode conversion apparatus and a nut projection welding machine comprising same. The electrode conversion apparatus comprises: a rotary member (1), wherein two or more electrode arm assembly mounting portions are provided on the rotary member, the electrode arm assembly mounting portions are located at different angular positions of the rotary member, the electrode arm assembly mounting portions are configured to mount electrode arm assemblies (2), and different electrode arm assemblies are provided with electrodes of the same or different specifications; and a rotating driving mechanism, wherein the rotating driving mechanism is connected to the rotary member and is configured to drive the rotary member to rotate so as to realize switching of the electrode arm assemblies. According to the electrode conversion apparatus, welding of various projection welding nuts can be achieved on one welding device without manual electrode replacement or debugging, etc., significantly improving the production efficiency, reducing the number of nut projection welding machines required in a production line, and reducing the costs.

The utility model relates to a scrap cleaning device of a sharpening machine, which is characterized in that the upper end face of a rotary cutter sleeve of the sharpening machine is fixedly connected with a guide convex ring through a fastener, and a plurality of troughs are arrayed on the upper end face of the guide convex ring in the circumferential direction; a guide mechanism is installed on a machine body of the sharpening machine, and the guide mechanism can enable the scrap removing head to be close to or away from a sharpening tool of the sharpening machine. The scrap removing head comprises a connecting shaft, the lower end of the connecting shaft is fixedly connected with an inner ring of a large ball bearing, a plurality of radial shafts fixedly connected with the large ball bearing are arrayed in the circumferential direction of the outer ring of the large ball bearing, and each radial shaft is fixedly connected with an inner ring of a small ball bearing. A disc is fixedly connected to the lower end of the outer ring of the large ball bearing, and a plurality of insertion rods are fixedly arranged on the lower surface of the disc; and when the outer rings of the multiple small ball bearings abut against the multiple wave troughs of the guide convex ring correspondingly, the multiple insertion rods can be inserted into gaps among the multiple sharpening knives. According to the utility model, an efficient, safe and reliable scrap cleaning solution can be provided for a spot welding process in a vehicle body workshop.

The invention relates to the technical field of electric welding equipment, and discloses an automatic cleaning device for electrodes of a spot welding machine, which comprises a workbench and further comprises two groups of electrode structures which are symmetrically mounted on the workbench and can be mutually close to or far away from each other for adjustment, each electrode structure comprises an electrode stem and an electrode cap, and a welding area is formed between the two electrode caps; the cleaning structure is arranged on the electrode structure and comprises a scrap collecting plate which is arranged below the electrode rod and can be adjusted to be close to or far away from the axis of the electrode rod, a scraper is installed on the inner wall of the scrap collecting plate, and the tangent plane track of the scraper is the same as that of the electrode cap. The cleaning structure and the electrode rod are integrated, and the time delay assembly is arranged, so that cleaning is started only in a non-spot-welding state, in-situ disassembly-free finishing of the electrode cap is achieved, and the effects that the normal welding rhythm is not affected, manual grinding and frequent electrode replacement are thoroughly omitted, and the continuous operation rate of a production line is remarkably improved are achieved.

The utility model relates to a spot welding head for double-sided welding, which comprises a connecting seat capable of being connected with a mechanical arm, and a deflection mechanism capable of adjustably driving a spot welding gun body to perform arc rotation is arranged on the bottom surface of the connecting seat. The axial lower end, away from the connecting base, of the deflection mechanism is connected with a transverse movement positioning assembly capable of driving the spot welding gun body to synchronously move on the upper side and the lower side of the thick workpiece. The transverse moving positioning assembly is matched with the deflection mechanism to change the working position of the spot welding gun body according to the mode that the transverse moving positioning assembly drives the spot welding gun body to translate while deflecting along with the deflection mechanism, so that a curve welding path is defined; the spot welding gun body is connected with the transverse moving positioning assembly through a telescopic rod. According to the utility model, the welding treatment of a thick workpiece can be efficiently completed in a double-sided synchronous welding processing mode while continuous multi-point welding processing is carried out on a curve welding seam.

The utility model discloses a screw welding upper electrode structure which comprises an upper electrode shell, a polyurethane insert is embedded in one end of the upper electrode shell, a spring is arranged in the upper electrode shell, a strong magnet located below the spring is further arranged in the upper electrode shell, and the upper electrode shell is provided with a screw. And the other end of the upper electrode shell is provided with a screw piece which extends into the upper electrode shell and is adsorbed by the strong magnet. An insulating rubber ring, a strong magnet and a spring are sequentially placed in an upper electrode cavity, then a polyurethane insert is embedded into the upper surface of an upper electrode, the polyurethane insert extrudes the spring, the spring pushes the strong magnet to abut against the insulating rubber ring, and the insulating rubber ring abuts against the inner wall plane of a second through hole. Then the rod part of the screw piece penetrates into the upper electrode shell from the lower surface of the upper electrode shell, the strong magnet can generate upward attraction force on the screw piece until the head part of the screw piece abuts against the end face of the upper electrode shell, clamping force is formed by the strong magnet and the end face of the upper electrode shell, and the screw piece can be fixed in the upper electrode shell.

The utility model discloses a concrete pole reinforcement cage seam welder electrode disc which comprises a disc body, conductive rollers and supporting shafts, a plurality of notches are formed in the outer circumferential wall of the disc body, the supporting shafts are installed in the notches, and the conductive rollers are rotatably installed on the supporting shafts. The multiple notches are formed in the outer circumferential wall of the disc body, the supporting shafts are installed in the notches, the conductive rollers are rotationally installed on the supporting shafts, in the using process, a main steel bar is supported on the conductive rollers, the conductive rollers roll along with the main steel bar, friction between the electrode disc and the main steel bar is reduced, and the service life of the electrode disc is prolonged.

The utility model discloses a resistance welding electrode cap dismounting device which comprises an abutting block, the inner surface of the abutting block is fixedly connected with a fixing column, the outer surface of the fixing column is rotationally connected with a sleeve frame, the outer surface of the abutting block is fixedly connected with a connecting rod, and the end, away from the abutting block, of the connecting rod is fixedly connected with a limiting block. A first spring is fixedly connected to the side surface of the limiting block, a sleeve is fixedly connected to the end, away from the limiting block, of the first spring, and a guide rod is slidably connected to the inner surface of the limiting block. Through the arrangement of the sleeve and the adjusting assembly, the overall length of the connecting rod can be adjusted, so that larger torque is provided for an operator when the electrode cap is disassembled, the operator can disassemble the electrode cap more easily, and the working efficiency is improved; and the connecting rod can be conveniently stored in the sleeve, so that the occupied space of the whole device is reduced, and the flexibility during storage is improved.

The invention relates to welding equipment for a temperature control element of a thin film heater, which is applied to the technical field of temperature control element welding and comprises a resistance welding machine provided with an upper electrode and a lower electrode and a welding aid mechanism, the welding aid mechanism comprises a supporting plate, and the bottom end of the supporting plate is fixedly connected with a lower connecting cylinder matched with the lower electrode; the outer wall of the lower connecting cylinder is movably sleeved with a conducting ring matched with the lower connecting cylinder, the outer wall of the conducting ring is fixedly connected with a C-shaped conducting rod, the conducting rod is fixedly provided with a lower-generation level head, the lower-generation level head is located above the supporting plate, and the bottom end of the lower-generation level head abuts against the top end of the supporting plate; according to the welding equipment, the lead of the temperature control element can be welded to the heating circuit in the film heater in an electric resistance welding mode, compared with tin soldering and electric resistance welding, higher welding strength and better high temperature resistance are achieved, the problem that a welding spot is softened and fails due to high temperature can be effectively solved, and the welding quality is improved. And the reliability of the temperature control system can be obviously improved.

The invention belongs to the technical field of welding and connection, and relates to a method for improving conductivity and anti-sticking property of an aluminum alloy resistance spot welding electrode, which comprises the following steps: preparing three areas of an electrode end surface layer, a transition layer and an electrode substrate, and then carrying out integral hot pressing sintering and backward extrusion forming to prepare a composite electrode material. The tungsten carbide is added to improve the wear-resistant and anti-sticking performance of the end face of the electrode, and the graphene is added to improve the conductivity of the electrode; a transition layer is arranged between the electrode substrate and the end surface layer so as to reduce the thermal stress fatigue of the electrode; through backward extrusion process forming, the electrode composite material after hot pressing sintering can be further compacted, the bonding strength of a composite electrode material interface is improved, the dispersion distribution state of graphene in a copper-chromium-zirconium matrix is improved, and the uniformity and conductivity of the material are improved. Compared with a conventional chromium-zirconium-copper electrode, the method has the advantages that the wear resistance of the electrode can be improved by more than 30%, the electric conductivity is improved by about 10%, and the number of continuous spot welding times of the electrode in the spot welding process of the aluminum alloy is increased by more than 35%.

The utility model discloses a kind of automatic cap changer for uncertain length electrode cap, including body support and the cap-off mechanism and cap installation mechanism being set on body support, the cap installation mechanism includes the cartridge loaded with the electrode cap to be installed, cartridge center is provided with middle shaft, cartridge is rotatably connected between middle shaft, rotating mechanism for rotating cartridge to switch electrode cap is set in cartridge, setting mechanism is set below cartridge for pushing electrode cap to lift in cartridge, and the upper end of electrode cap is kept at the same height position;The utility model can make the height position where electrode cap end is kept consistent when installing electrode cap each time by setting setting mechanism, not affected by the length of electrode cap itself, robot welding tongs can use uncertain length electrode cap when cap installation under the same trajectory each time, realize the purpose of automatic replacement electrode cap.

The utility model relates to a resistance welding electrode tip structure, which consists of a spot welding electrode tip and an electrode stem, and is characterized in that the spot welding electrode tip is in threaded connection with the electrode stem, a flange table of 1mm is arranged at the bottom of the thread of the electrode tip in the circumferential direction, the electrode tip and the electrode stem are fastened through threads, and the flange table of the electrode tip is attached to a flange table at an inner hole of the electrode stem. The vertical force of spot welding is borne, and the electrode tip is embedded into the electrode rod by 5 mm. Inclination and looseness of the electrode tip caused by tangential force generated by the die repairing electrode tip are avoided, and the position precision of spot welding is enhanced. The structure is simple and dismounting is convenient.

A resistance welding device is provided that can join fastening members to the bottom wall and side wall of a workpiece. [Solution] The resistance welding device (1) includes a first electrode (10), a second electrode (20) that moves toward and away from the first electrode in a first direction (Z), and a conductive adapter (30) that moves in a second direction (X) that intersects the first direction. The adapter advances to a first position (P1) between the first and second electrodes by moving toward one side (Xa) in the second direction, and retreats to a second position (P2) away from the first position by moving toward the other side (Xb) in the second direction. The adapter includes a base (31) extending in the first direction, a first extension (36) extending from the first electrode side of the base in the first direction to one side in the second direction, and a second extension (37) extending from the second electrode side of the base in the first direction to one side in the second direction.

The present invention provides a welding element and a welding electrode for resistance spot welding of dissimilar metals. The welding element welds first and second metals having a melting point difference greater than 700°C. The shaft of the welding element pierces the first metal with a lower melting point and forms a weld nugget with the second metal, thereby firmly welding the first metal. During welding, the auxiliary deformation zone of the cap structure preferentially undergoes plastic deformation, allowing the cap structure to maintain a thin-walled cavity structure and thereby fully accommodate the molten first metal discharged from the weld point. The provided welding electrode further facilitates the formation of the cap structure of the welding element, controls the height of the cap structure, and improves the forming quality of the weld point.

The utility model relates to a welding electrode structure and welding equipment. The welding electrode structure comprises an electrode arm, an electrode cap, a clamping plate, a sleeve and a nut, a mounting hole is formed in one end of the electrode arm; one end of the electrode cap is inserted into the mounting hole, and an annular groove is formed in the side surface of the electrode cap; a clamping opening is formed in the clamping plate, and the clamping plate is clamped on the annular groove through the clamping opening; the sleeve is arranged on the electrode cap in a sleeving manner, and external threads are arranged on the sleeve; and the nut is screwed on the sleeve. The welding electrode structure is provided with the clamping plate, the sleeve and the nut, the sleeve is in threaded connection with the nut, and the clamping plate is clamped on the electrode cap to limit the sleeve and the nut between the electrode cap and the electrode arm; when external force is applied through a wrench to enable the nut to rotate relative to the sleeve, the overall length of the structure composed of the sleeve and the nut is increased, so that axial force is applied to the clamping plate, the electrode cap connected with the clamping plate in a clamped mode is ejected out of the mounting hole, disassembly is efficient, and the electrode cap is not prone to being damaged.

The utility model discloses a spot-welding electrode cap replacing machine with an electrode cap replacing clip, and particularly relates to the technical field of electrode caps, the spot-welding electrode cap replacing machine comprises a bottom plate, a mounting plate and a moving rod, the top of the bottom plate is provided with the mounting plate, the moving rod is fixedly connected to the inner center of the mounting plate in a penetrating manner, and the top of the moving rod is provided with an electric push rod; clamping rings are symmetrically arranged on the two sides of the interior of the mounting plate, extrusion barrels are symmetrically arranged at the interval between the two clamping rings, a containing barrel is mounted on the side, close to the extrusion barrels, of the top of the bottom plate, and a plurality of clamping blocks are mounted on the outer walls of the bottoms of the clamping rings in a surrounding mode; the outer wall of the bottom of the moving rod is fixedly connected with a prismatic ring, and the prismatic ring and the interior of the bottom plate are in mutual penetrating sliding connection. The electrode cap clamping device has the advantages that the electrode caps can be conveniently disassembled and replaced, manual disassembly and assembly are not needed, the work is improved, and the electrode caps of different sizes can be conveniently adjusted to be clamped and replaced.

The application discloses a sealing and welding device, and belongs to the technical field of laser emitter manufacturing. The sealing and welding device is characterized in that: a first supporting surface and a second supporting surface intersecting each other are arranged on a first electrode to form a bearing area for bearing a pipe base, so that the first supporting surface can be used for supporting a first outer wall of the pipe base, and the second supporting surface can be used for supporting a second outer wall of the pipe base; an avoiding area for avoiding a pipe cap is arranged on a second electrode, a press-welding part is arranged at the edge of the avoiding area, the pipe cap can be pressed on the pipe base by the press-welding part, a first welding section arranged opposite to the first supporting surface is used for pressing a first combining part of the pipe cap on a first inner wall of the pipe base, and a second welding section arranged opposite to the second supporting surface is used for pressing a second combining part of the pipe cap on a second inner wall of the pipe base, so that the pipe cap and the pipe base can be welded on different planes, and the sealing and welding device can be used for packaging laser emitters with the pipe cap and the pipe base sealed on different planes.

A pressure resistance welding electrode comprises an electrode front plate, an electrode back plate and a metal sheet group, the metal sheet group is located between the electrode front plate and the electrode back plate, the electrode back plate introduces current, the metal sheet group comprises a plurality of metal sheets for guiding the current to flow, the metal sheet comprises a body layer and a sprayed layer, the sprayed layer is attached to at least one side of the body layer, and the sprayed layer causes the current to be shunted along the plurality of metal sheets. The application can prolong the length of the cladding tube end heating zone and solve the problems of short service life, poor reliability, uneven current distribution and narrow welding range of the prior art pressure resistance welding electrode.

The full-automatic electrode cap coping device comprises a workbench, a coping box is fixed to the workbench, a gear box is installed in the coping box through a lifting mechanism, and the bottom of the gear box is rotationally sleeved with a plurality of first rotating shafts arranged at equal intervals; a rotating mechanism used for driving the first rotating shaft to rotate is installed in the gearbox, an installation base is fixed to the bottom end of the first rotating shaft, a second sliding block is installed in the installation base in a sliding mode, an adjusting mechanism used for driving the second sliding block to move horizontally is installed in the installation base, and a tool apron is fixed to the second sliding block. A sharpening tool is installed on the tool apron, and a visual camera is installed at the bottom of the gearbox. The device is high in machining efficiency and convenient to operate.

This utility model relates to the field of steel truss welding technology and discloses a steel truss welding device, including a spot welding gun and a welding electrode, as well as a movable component, a sleeve component, and an adsorption seat. The movable component includes two strip blocks and an elastic movable part. The two strip blocks are fixedly installed on the spot welding gun, and the elastic movable part is disposed between the two strip blocks. The sleeve component includes a rotating plate, a protective part, and a grinding part. The rotating plate is rotatably installed in the elastic movable part. After using the spot welding gun, the operator can detach the rotating ring and the sleeve component from the adsorption seat. Then, while rotating the sleeve component toward the welding electrode, the operator can pull the rotating ring and the sleeve component to the left to move the protective sleeve to the front of the welding electrode. At this time, the rotating ring is released, and the protective sleeve can be sleeved on the welding electrode under the push of the first spring, forming a protection for the welding electrode and slowing down the oxidation rate of the welding electrode.

The utility model discloses a kind of projection welding nut mistake-proof lower electrode devices, relate to automobile parts manufacturing technical field, including bracket fixed block, the inside connection of bracket fixed block has projection welding lower electrode seat, the top of projection welding lower electrode seat is connected with projection welding lower electrode, the inner side wall of projection welding lower electrode is connected with projection welding nut positioning pin, the middle part of one side of bracket fixed block is screwed with first fastening bolt, the bottom edge of bracket fixed block is connected with bakelite connecting plate by bolt, the bottom of bakelite connecting plate is provided with adjusting mechanism;The projection welding nut mistake-proof lower electrode device, when position is correct, mistake-proof pin is located in part hole, if position is not correct, the distance of wrong welding hole and part hole changes, mistake-proof pin cannot enter part hole, to position positioning is carried out, so that welding position always remains correct, avoid welding error, improve the accuracy of welding.

The utility model discloses a welding device, which comprises a welding assembly, a welding assembly and a welding assembly, and the welding assembly comprises a static electrode and a movable electrode; and the traceless assembly comprises a traceless plate, the traceless plate is detachably arranged on the static electrode, the traceless plate is located at the lower end of the movable electrode, and the movable electrode can be used for welding a workpiece arranged on the traceless plate. The traceless plate is detachably arranged on the static electrode, at the moment, welding can be conducted at multiple position points, a plurality of traceless plates do not need to be arranged, the traceless plate is located at the lower end of the movable electrode, the movable electrode can weld a workpiece arranged on the traceless plate, and therefore traceless welding of the workpiece can be achieved, and the welding quality can be guaranteed.

The invention belongs to the technical field of welding, and particularly relates to a coaxial electrode device for metal-composite material resistance spot welding and a using method of the coaxial electrode device. The device comprises a supporting piece, a composite material plate arranged on the supporting piece, a metal plate arranged on the composite material plate, a negative electrode head arranged on the metal plate, a positive electrode head arranged outside the negative electrode head, a positive electrode connecting piece arranged above the positive electrode head, a positive electrode conducting rod arranged on the positive electrode connecting piece and a positive electrode base, the annular insulation pad is arranged on the positive electrode base, the negative electrode base is arranged on the annular insulation pad, the annular insulation pad is arranged on the negative electrode base, and the negative electrode conducting rod is arranged on the annular insulation pad. The device has the advantages of being simple and reliable in structure and capable of achieving rapid welding.

The present invention provides a resistance welding apparatus capable of joining fastening members to the bottom wall and side wall of a workpiece. [Solution] The resistance welding apparatus 1 comprises a first electrode 10, a second electrode 20 that moves toward or away from the first electrode in a first direction Z, and a conductive adapter 30 that moves in a second direction X intersecting the first direction. The adapter enters a first position P1 between the first electrode and the second electrode by moving to one side Xa in the second direction, and retreats to a second position P2 away from the first position by moving to the other side Xb in the second direction. The adapter includes a base portion 31 extending in the first direction, a first extension portion 36 extending from the side of the base portion toward the first electrode in the first direction to one side in the second direction, and a second extension portion 37 extending from the side of the base portion toward the base portion toward the second electrode in the first direction to one side in the second direction.

An improved resistance welding electrode cap is arranged at the end of the electrode rod, comprising: a ring-shaped permanent magnet arranged at the outer edge of the end, a thin-walled high-resistivity magnetic conductive interlayer and an electrode copper core arranged in the electrode cap in sequence, and a cavity arranged at the top end for circulating cooling water, the upper end of the thin-walled high-resistivity magnetic conductive interlayer is in contact with the cooling water in the cavity, the lower end is flush with the end face of the electrode cap and the ring-shaped permanent magnet, and three current density distribution areas are formed between the electrode end face and the workpiece to be welded, i.e. the ring-shaped permanent magnet area with the smallest current density, the interlayer inner area, and the permanent magnet inner area and the interlayer outer area with the largest current density. By embedding the thin-walled high-resistivity magnetic conductive interlayer in the electrode cap, the current density distribution is changed to reduce the current density of the central part of the electrode, thereby reducing the heat generation in the central area while ensuring the heat generation in the central area, reducing the maximum indentation depth of the central area, and reducing the surface indentation.

The invention relates to a double-acting linear drive, consisting of a combination of a linear drive (mechanic / pneumatic / hydraulic) with a spring for the purpose of boosting the force of the linear drive on one end beyond the pure nominal force of the linear drive.

Strip flash butt welding machine (1) for welding end faces (7, 15) of strip ends (3, 11) of at least one strip with a) first tensioning elements (5) for tensioning a first band end (3) and second tensioning elements (12) for tensioning a second band end (11), b) a first alignment element (4) for aligning the first strip end (3) and a second alignment element (10) for aligning the second strip end (11), c) wherein the second clamping elements (12) are movable relative to the first clamping elements (5) in the direction of a longitudinal axis (9) via a drive, d) the first clamping elements (5) and the second clamping elements (12) each comprise a strip flash butt welding machine electrode (6, 13) which is formed at least in two parts and comprises a base body (57) and a contact body (58), characterized in that e) the first alignment element (4) and the second alignment element (10) are coupled to one another via a coupling device which specifies a relative alignment of the first and second alignment elements (4, 10), f) the second clamping elements (12) are movable translationally in the direction of the longitudinal axis (9) relative to the two alignment elements (4, 10) by means of the drive and g) the coupling device is a mechanical coupling device (54) which firmly connects the first alignment element (4) and the second alignment element (10) during a conversion.

The present invention relates to a spot welding machine electrode tip grinding device and method, comprising a positioning mechanism and a grinding mechanism, wherein the positioning mechanism is composed of a locking nut, an upper fixing block, a sliding rod, a lower fixing block, and a clamping barrel; the grinding mechanism is composed of an upper shell, a lower shell, a fixing seat, a blade, a bearing, an air motor, a hand pressure valve, a rotating cylinder, a first gear, and a second gear; the positioning mechanism is arranged on the upper and lower electrode arms of the spot welding machine, and the grinding mechanism can slide up and down along the positioning mechanism to complete the coaxial grinding of the upper and lower electrode tips. The beneficial effects are as follows: the device of the invention uses the positioning mechanism to make the rotation center of the grinding mechanism blade coincide with the center line of the upper and lower electrode tips of the spot welding machine. The high stability of the positioning mechanism can effectively improve the grinding quality of the electrode tip, thereby improving the welding quality and stability. The overall structure is simple, easy to operate and use, and the manufacturing cost is low.