A projection welding machine electrode dressing automatic compensation device

Abstract

The present application relates to the field of automatic projection welding workstation, and discloses a kind of electrode dressing automatic compensation device of projection welding machine, comprising: cylinder and hollow structure's grip lever, cylinder is installed in the bottom end of grip lever by cylinder connecting piece, electrode cover is installed in the top end of grip lever by electrode holder, positioning pin buckle assembly is arranged in electrode holder, nut positioning pin is located in the center end of electrode cover, and is connected with positioning pin top rod by positioning pin buckle assembly, positioning pin top rod is located in grip lever, and is connected with the top rod of cylinder, cylinder barrel is equipped with magnetic scale sensor for detecting the displacement of top rod in it, and magnetic scale sensor is electrically connected with workstation.The electrode dressing automatic compensation device of projection welding machine provided by the present application corrects the position of the parts placed by industrial robot, realizes dressing compensation, enriches the conveying form of parts, and facilitates the replacement of nut positioning pin.

Description

Technical Field

[0001] The invention relates to the field of automatic projection welding workstations, in particular to an automatic compensation device for electrode grinding of a projection welding machine. Background Art

[0002] An automated projection welding station uses an industrial robot with a gripper to grasp parts, automatically feed nuts, and then spot weld the nuts into specific holes on the parts using the principle of spot welding. After welding a certain number of workpieces, the electrode surface becomes uneven, reducing weld quality and necessitating electrode grinding. As grinding increases, the lower electrode end face degrades. Because the robot cannot automatically adjust the placement position based on the amount of grinding, the gap between the workpiece and the lower electrode end face increases, significantly reducing weld quality and resulting in a large number of defective products.

[0003] Chinese patent document CN213469944U discloses an electrode grinding compensation detection device for an automatic projection welding workstation, comprising an electrode, a positioning pin, a connecting rod, a clamping tube, and a displacement sensor. The electrode is fixed to the top of the clamping tube, the connecting rod is arranged inside the clamping tube, the connecting rod is slidably connected to the clamping tube, the top of the connecting rod is fixedly connected to the positioning pin, the positioning pin extends to the upper part of the positioning pin through a through hole reserved for the electrode, a calibration block is sleeved on the positioning pin, a first inclined portion for limiting the calibration block is provided on the positioning pin, the bottom of the connecting rod is connected to the end of the detection rod of the displacement sensor, a bracket is fixed to the bottom of the clamping tube, and the displacement sensor is mounted on the bracket. The above-mentioned electrode grinding compensation detection device for an automatic projection welding workstation utilizes the settlement amount monitoring of the positioning pin to realize the monitoring of the grinding amount, thereby meeting the demand for grinding compensation. However, there are still the following deficiencies:

[0004] (1) After the nut welding is completed, the positioning pin will not automatically shrink and avoid, causing the part to be unable to be removed horizontally, which limits the part's transportation method;

[0005] (2) The locating pins of traditional automatic projection welding are not shared with manual welding and are directly connected to the ejector rod through threads. The length of the locating pins is more than three times longer than that of traditional styles. This not only results in high spare parts costs, but also makes replacement difficult (two wrenches are required to clamp the tight and loose ends respectively, which is difficult to operate due to the small space). Summary of the Invention

[0006] To achieve the above-mentioned purpose, the present invention discloses an automatic compensation device for electrode grinding of a projection welding machine, comprising: a cylinder and a grip rod with a hollow structure, the cylinder being installed at the bottom end of the grip rod through a cylinder connector, the electrode cover being installed at the top end of the grip rod through an electrode seat, a locating pin buckle assembly being provided in the electrode seat, the nut locating pin being located at the center end of the electrode cover, and being connected to the locating pin push rod through the locating pin buckle assembly, the locating pin push rod being located in the grip rod, and being connected to the push rod of the cylinder, a magnetic scale sensor for detecting the displacement of the push rod therein being installed on the cylinder barrel of the cylinder, and the magnetic scale sensor being electrically connected to the workstation.

[0007] Preferably, the cylinder connector is mounted on the magnetic scale protective cover, and the cylinder is located inside the magnetic scale protective cover.

[0008] Preferably, the bottom end of the electrode holder is integrally formed with a lower mounting cone, which is inserted into the top end of the grip rod. The inner wall of the grip rod is provided with a slope near the top end to adapt to the insertion of the lower mounting cone. A cooling chamber is provided in the electrode holder, and the water inlet and outlet are located at the same side end of the electrode holder and are connected to the cooling chamber. The side end of the electrode holder is provided with an external protrusion near the cooling chamber, and the side end of the grip rod is provided with a side fixing component for limiting the external protrusion near the top end.

[0009] Preferably, the electrode cover is threadedly connected to the top end of the electrode holder, and a grinding scale line is provided on the side end of the electrode cover to facilitate observation of the grinding loss of the top end of the electrode cover.

[0010] Preferably, the positioning pin buckle assembly includes:

[0011] The buckle head, the slot is located at the top of the buckle head, the side end of the buckle head is provided with a notch connected to the slot, the bottom end of the nut locating pin is set as a frustum-shaped structure, and is clamped in the slot from the notch, the top end of the locating pin push rod is connected to the bottom end of the buckle head, and the bottom end of the locating pin push rod is connected to the cylinder connecting head through the push rod lower limit buckle, and the cylinder connecting head is installed on the push rod of the cylinder.

[0012] Preferably, the side fixing assembly includes:

[0013] The first screw block and the second screw block are oppositely clamped at the side end of the handle near the top end;

[0014] A side clamping plate, the horizontal section of which is clamped on the top of the outer protrusion;

[0015] An action chamber is located in the screw block 1, a sliding seat is slidably installed in the action chamber, and the vertical section of the side clamp extends into the action chamber and is connected to the sliding seat;

[0016] Side chambers, two sets of side chambers are symmetrically located in the sliding seat, air guide tubes penetrating the side chambers are installed opposite to each other on the inner wall of the action chamber, and the sliding plug is located in the side chamber and connected to the air guide tubes;

[0017] The two groups of jet channels are symmetrically distributed in the screw block 1 and are connected with the air guide pipe. The air outlet end of the jet channel is located at the top of the screw block 1 and below the outer convex block.

[0018] Preferably, the air guide tube is provided with an air inlet near the sliding plug end, the air outlet end of the jet channel is provided with a closed end, the top of the screw block is provided with an upper slide groove connected to the action chamber, the upper slider is slidably connected in the upper slide groove, and is connected between the vertical section of the side clamp and the sliding seat.

[0019] Preferably, photoelectric detection components and electromagnetic correction components are distributed opposite to each other on the inclined surface, and four groups of photoelectric detection components and electromagnetic correction components are designed, and each group is distributed opposite to each other. Each group of photoelectric detection components includes two photoelectric switches embedded and installed on the inclined surface, one above and one below, and a lamp post with a matching photoelectric switch is embedded on the side end of the lower mounting cone. Each group of electromagnetic correction components includes a side mounting groove opened on the inclined surface, and several groups of electromagnets are arranged in sequence from top to bottom in the side mounting groove, and a magnetic block with a matching electromagnet is embedded on the side end of the lower mounting cone. Several groups of electromagnets are started in sequence from top to bottom or from bottom to top.

[0020] Preferably, the side mounting groove is made of iron.

[0021] Compared with the prior art, the present invention has at least the following beneficial effects:

[0022] 1. The present invention provides an automatic compensation device for electrode grinding on projection welding machines. This device corrects the position of parts placed by industrial robots, achieving grinding compensation while enriching the part delivery method and facilitating the replacement of nut locating pins. After each grinding of the electrode cover, the nut is placed on the nut locating pin, leaving a gap between the nut and the electrode cover. The upper electrode then presses down on the nut, causing the nut locating pin to sink. The nut locating pin, through the locating pin snap assembly, drives the locating pin push rod and the cylinder push rod connected to the locating pin push rod to sink within the cylinder barrel until the nut rests on the electrode cover. The magnetic scale sensor records the amount H of settlement of the cylinder push rod within the cylinder barrel and transmits it to the workstation. The workstation compares the settlement H of the electrode cover in the previous stage. The difference between the two is the compensation amount for the industrial robot to place the part. This ensures that the part fits the electrode cover perfectly every time. The cylinder can also actively drive the nut locating pin to sink, thereby realizing the active contraction and avoidance of the locating pin. The nut locating pin is installed in the electrode holder through the locating pin buckle assembly. After unscrewing the electrode cover, the nut locating pin can be easily replaced on the locating pin buckle assembly.

[0023] 2. The present invention provides an automatic compensation device for electrode grinding of a projection welding machine. When screw block one or screw block two is hit by an external force, screw block one instantly moves in the direction of the external force. At this time, because the grip rod is a hollow structure with low structural strength, the top of the grip rod connected to screw block one will also tilt at a small angle toward the direction of the external force. The gas in the side chamber in the opposite direction of the force position of screw block one is pressed into the air duct by the sliding plug and ejected from the jet channel. The air flow sweeps under the outer projection, thereby correcting the inclination of the electrode seat following the grip rod, so that the nut positioning pin on the electrode seat is kept as vertical as possible.

[0024] 3. This invention provides an automatic compensation device for electrode grinding on projection welding machines. When the external projection is impacted by an external force, a photoelectric detection component and an electromagnetic correction component actively correct the lower mounting cone within the inclined surface. This compensates for the tilt of the electrode holder caused by the impact of the external projection, ensuring that the nut positioning pin on the electrode holder remains as vertical as possible. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0026] Figure 1 It is an outline diagram of the present invention;

[0027] Figure 2 for Figure 1 Cross-sectional view at AA in the middle;

[0028] Figure 3 Axonometric Figure 1 (When the magnetic scale protective cover is open);

[0029] Figure 4 Axonometric Figure 2 (When the magnetic scale protective cover is closed);

[0030] Figure 5 This is a schematic diagram of the cooperation between the buckle head and the nut positioning pin of the present invention;

[0031] Figure 6 It is an internal cross-sectional view of a screw block of the present invention;

[0032] Figure 7 This is a schematic diagram of the cooperation between the lower mounting cone and the inclined surface of the present invention;

[0033] Figure 8 for Figure 7 Enlarged view of the middle label B;

[0034] Figure 9 for Figure 7 Enlarged view of the number C in the middle.

[0035] Figure: 10. Cylinder; 11. Grip; 12. Cylinder connector; 13. Electrode cover; 14. Electrode holder; 15. Positioning pin buckle assembly; 16. Nut positioning pin; 17. Positioning pin push rod; 18. Magnetic scale sensor; 19. Magnetic scale protective cover; 21. Water inlet; 22. Water outlet; 23. Buckle head; 24. Notch; 25. Slot; 26. Push rod lower limit buckle; 27. Lower mounting cone; 28. Inclined surface ; 29. ​​External protrusion; 30. Side fixing assembly; 31. Screw block 1; 32. Screw block 2; 33. Cylinder connector; 34. Side clamp; 35. Action chamber; 36. Sliding seat; 37. Side chamber; 38. Air duct; 39. Sliding plug; 40. Jet channel; 41. Air inlet; 42. Upper slide; 43. Upper slide; 44. Photoelectric switch; 45. Lamp post; 46. Side mounting slot; 47. Electromagnet; 48. Magnetic block. DETAILED DESCRIPTION

[0036] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0037] Example 1:

[0038] Please refer to Figures 1 to 5 , this embodiment provides an automatic compensation device for electrode grinding of a projection welding machine, comprising: a cylinder 10 and a grip rod 11 with a hollow structure, the cylinder 10 being installed on the bottom end of the grip rod 11 through a cylinder connector 12, the electrode cover 13 being installed on the top end of the grip rod 11 through an electrode holder 14, a positioning pin buckle assembly 15 being provided in the electrode holder 14, a nut positioning pin 16 being located at the center end of the electrode cover 13, and being connected to a positioning pin push rod 17 through the positioning pin buckle assembly 15, the positioning pin push rod 17 being located in the grip rod 11, and being connected to the push rod of the cylinder 10, a magnetic scale sensor 18 for detecting the displacement of the push rod therein being installed on the cylinder barrel of the cylinder 10, and the magnetic scale sensor 18 being electrically connected to the workstation.

[0039] The working principle and beneficial effects of the above technical solution are:

[0040] The present invention discloses an automatic compensation device for electrode grinding of a projection welding machine. After each grinding of the electrode cover 13, the nut is placed on the nut positioning pin 16, leaving a gap between the nut and the electrode cover 13. Then, the upper electrode presses down on the nut, thereby driving the nut positioning pin 16 to settle. The nut positioning pin 16 drives the positioning pin push rod 17 and the push rod of the cylinder 10 connected to the positioning pin push rod 17 to settle in the cylinder barrel of the cylinder 10 through the positioning pin buckle assembly 15. After the nut is placed on the electrode cover 13, the magnetic scale sensor 18 records the settlement amount H2 of the push rod of the cylinder 10 in the cylinder barrel of the cylinder 10 and transmits it to the workstation. The workstation compares the settlement amount H1 of the electrode cover 13 in the previous stage. The difference between the two is the compensation amount for the industrial robot to place the part. This ensures that the part can be fitted to the electrode cover 13 every time. The cylinder 10 can also actively drive the nut positioning pin 16 to sink, thereby achieving active retraction and avoidance of the positioning pin. The nut positioning pin 16 is installed in the electrode holder 14 through the positioning pin buckle assembly 15. After unscrewing the electrode cover 13, the nut positioning pin 16 can be conveniently replaced on the positioning pin buckle assembly 15. The present invention provides an automatic compensation device for electrode grinding of a projection welding machine, which corrects the position of the industrial robot to place parts, achieves grinding compensation, enriches the parts transportation mode, and facilitates the replacement of the nut positioning pin 16.

[0041] In this embodiment, the cylinder connector 12 is mounted on the magnetic scale protection cover 19 , and the cylinder 10 is located inside the magnetic scale protection cover 19 .

[0042] The beneficial effects of the above technical solution are:

[0043] The magnetic scale protection cover 19 is provided to provide protection for the cylinder 10 and the magnetic scale sensor 18 therein.

[0044] In this embodiment, the bottom end of the electrode holder 14 is integrally formed with a lower mounting cone 27, and the lower mounting cone 27 is inserted into the top end of the grip rod 11. The inner wall of the grip rod 11 is provided with a slope 28 near the top to adapt to the insertion of the lower mounting cone 27. A cooling chamber is provided in the electrode holder 14, and the water inlet 21 and the water outlet 22 are located at the same side end of the electrode holder 14 and are connected to the cooling chamber. The side end of the electrode holder 14 is provided with an external protrusion 29 near the cooling chamber, and the side end of the grip rod 11 is provided with a side fixing component 30 for limiting the external protrusion 29 near the top.

[0045] The working principle and beneficial effects of the above technical solution are:

[0046] The lower mounting cone 27 facilitates the installation of the electrode holder 14 at the top of the grip 11. The water inlet 21 and outlet 22 are connected to circulating cooling water, which is fed into the cooling chamber to cool the electrode holder 14. Furthermore, the lower mounting cone 27 and the inclined surface 28 allow the electrode holder 14 to move a certain distance at the top of the grip 11 when the external projection 29 is impacted by external forces. This effectively relieves the force, reduces the force acting on the grip 11, and minimizes the possibility of deformation of the top of the grip 11 caused by the impact of the external projection 29.

[0047] In this embodiment, the electrode cover 13 is threadedly connected to the top of the electrode holder 14 , and a grinding scale line is provided on the side of the electrode cover 13 to facilitate observation of the grinding loss of the top of the electrode cover 13 .

[0048] The working principle and beneficial effects of the above technical solution are:

[0049] The electrode cover 13 is connected to the top of the electrode holder 14 by means of internal and external threads, so as to facilitate the disassembly and assembly of the electrode cover 13 and the setting of the grinding scale line, so as to facilitate manual observation of the grinding loss of the top of the electrode cover 13.

[0050] In this embodiment, the positioning pin buckle assembly 15 includes:

[0051] The buckle head 23 and the slot 25 are located at the top of the buckle head 23. The side end of the buckle head 23 is provided with a notch 24 connected to the slot 25. The bottom end of the nut locating pin 16 is set as a truncated cone structure and is clamped in the slot 25 from the notch 24. The top end of the locating pin push rod 17 is connected to the bottom end of the buckle head 23. The bottom end of the locating pin push rod 17 is connected to the cylinder connecting head 33 through the push rod lower limit buckle 26. The cylinder connecting head 33 is installed on the push rod of the cylinder 10.

[0052] The working principle and beneficial effects of the above technical solution are:

[0053] After unscrewing the electrode cover 13, Figure 5 As shown, the nut locating pin 16 is taken out from the notch 24. When replacing the nut locating pin 16 with a different specification, the bottom end of the nut locating pin 16 is also inserted into the card slot 25 from the notch 24. Then screw on the electrode cover 13, and the nut locating pin 16 can be fixed on the electrode holder 14. The nut is placed on the nut locating pin 16, and the upper electrode presses the nut down. The nut locating pin 16 drives the locating pin push rod 17, the push rod lower limit buckle 26 connected to the locating pin push rod 17, and the cylinder connecting head 33 connected to the push rod lower limit buckle 26 through the buckle head 23 to drive the push rod of the cylinder 10 to settle in the cylinder barrel of the cylinder 10 until the nut is against the electrode cover 13. The magnetic scale sensor 18 records the settlement amount H2 of the push rod of the cylinder 10 in the cylinder barrel of the cylinder 10.

[0054] Example 2:

[0055] Please refer to Figure 1 、 Figure 2 and Figure 6 Based on the above embodiment 1, the side fixing assembly 30 includes:

[0056] Screw block 1 31 and screw block 2 32 are oppositely clamped at the side end of the handle 11 near the top;

[0057] A side clamping plate 34, the horizontal section of which is clamped on the top of the outer protrusion 29;

[0058] The action chamber 35 is located in the screw block 1 31. A sliding seat 36 is slidably installed in the action chamber 35. The vertical section of the side clamp 34 extends into the action chamber 35 and is connected to the sliding seat 36.

[0059] Side chambers 37, two sets of side chambers 37 are symmetrically located within the sliding seat 36, and air guide tubes 38 are installed on the inner wall of the action chamber 35 and pass through the side chambers 37. Sliding plugs 39 are located within the side chambers 37 and connected to the air guide tubes 38;

[0060] The two groups of jet channels 40 are symmetrically distributed in the screw block 1 31 and are connected to the air guide tube 38 . The air outlet ends of the jet channels 40 are located at the top of the screw block 1 31 and below the outer protrusion 29 .

[0061] The working principle and beneficial effects of the above technical solution are:

[0062] When screw block 1 31 or screw block 2 32 is impacted by an external force, screw block 1 31 instantly moves in the direction of the external force. At this point, because grip 11 is hollow and weak, the top end of grip 11, connected to screw block 1 31, also tilts slightly in the direction of the external force. Gas in side chamber 37 opposite the force-applying position of screw block 1 31 is forced into air duct 38 by sliding plug 39 and ejected from air passage 40. This airflow sweeps beneath outer protrusion 29, correcting the tilt of electrode holder 14 following grip 11 and maintaining nut locating pin 16 on electrode holder 14 as nearly vertical as possible. The design of lower mounting cone 27 and inclined surface 28 allows for a certain amount of movement of electrode holder 14 at the top end of grip 11.

[0063] Specifically, for example, Figure 6As shown, when the left side of screw block 1 31 is impacted by an external force, screw block 1 31 instantly moves to the right. At this time, the sliding seat 36 connected to the side clamp 34 slides leftward relative to the actuating chamber 35, and the sliding plug 39 located in the side chamber 37 on the right side of the sliding seat 36 slides rightward, thereby forcing the gas in the side chamber 37 through the air guide tube 38 into the jet passage 40 on the right side of screw block 1 31 and ejecting it from the jet passage 40. The airflow sweeps under the outer protrusion 29 on the right side of the electrode holder 14, thereby causing the electrode holder 14 connected to the outer protrusion 29 to tilt to the left. In this way, even if the electrode holder 14 tilts to the right along with the handle 11, the jet passage 40 on the right side of the screw block 1 31 can still eject air to correct the electrode holder 14, so that the nut positioning pin 16 on the electrode holder 14 remains as vertical as possible.

[0064] In this embodiment, the air guide tube 38 is provided with an air inlet 41 near the end of the sliding plug 39, the air outlet end of the jet channel 40 is arranged in a closed type, and the top end of the screw block 31 is provided with an upper slide groove 42 connected to the action chamber 35. The upper slider 43 is slidably connected in the upper slide groove 42 and is connected between the vertical section of the side clamp 34 and the sliding seat 36.

[0065] The working principle and beneficial effects of the above technical solution are:

[0066] The air outlet end of the jet channel 40 is configured to be closed to increase the flow rate, and the configuration of the upper slide groove 42 and the upper slider 43 facilitates the sliding seat 36 to drive the side clamping plate 34 to slide in the action chamber 35.

[0067] Example 3:

[0068] Please refer to Figures 7 to 9 On the basis of the above-mentioned embodiment 1, photoelectric detection components and electromagnetic correction components are distributed opposite to each other on the inclined surface 28. There are four groups of photoelectric detection components and electromagnetic correction components, and each group is distributed opposite to each other. Each group of photoelectric detection components includes two photoelectric switches 44 embedded and installed on the inclined surface 28, one above and one below. The side end of the lower mounting cone 27 is embedded with a lamp post 45 equipped with an adapted photoelectric switch 44. Each group of electromagnetic correction components includes a side mounting groove 46 opened on the inclined surface 28. Several groups of electromagnets 47 are arranged in sequence from top to bottom in the side mounting groove 46. The side end of the lower mounting cone 27 is embedded with a magnetic block 48 equipped with an adapted electromagnet 47. Several groups of electromagnets 47 are started in sequence from top to bottom or from bottom to top.

[0069] The working principle and beneficial effects of the above technical solution are:

[0070] In the initial state, the lamp post 45 is located between the two photoelectric switches 44. When the outer protrusion 29 is hit by an external force, the electrode holder 14 can move to a certain extent at the top of the handle 11, effectively unloading the force to reduce the force on the handle 11 and minimize the possibility of deformation of the top of the handle 11 caused by the collision of the outer protrusion 29. However, in contrast, the lower mounting cone 27 is inclined within the inclined surface 28, such as Figure 8 As shown, if the upper photoelectric switch 44 detects that the lamp post 45 is lit, the lower mounting cone 27 tilts to the right within the inclined surface 28. At this time, several groups of electromagnets 47 are activated in sequence from bottom to top, gradually driving the magnetic block 48 and the lower mounting cone 27 connected to the magnetic block 48 to restore to the left. After the lamp post 45 returns to the position between the two photoelectric switches 44, the electromagnets 47 stop working, and the lower mounting cone 27 is corrected within the inclined surface 28. If the lower photoelectric switch 44 detects that the lamp post 45 is lit, the lower mounting cone 27 tilts to the left within the inclined surface 28. At this time, several groups of electromagnets 47 are activated in sequence from top to bottom, gradually driving the magnetic block 48 and the lower mounting cone 27 connected to the magnetic block 48 to restore to the right. After the lamp post 45 returns to the position between the two photoelectric switches 44, the electromagnets 47 stop working, and the lower mounting cone 27 is corrected within the inclined surface 28. In this way, the lower mounting cone 27 can be actively corrected in the inclined surface 28 to compensate for the tilt of the electrode holder 14 caused by the collision of the outer protrusion 29, so that the nut positioning pin 16 on the electrode holder 14 can be kept vertical as much as possible.

[0071] In this embodiment, the side mounting groove 46 is made of iron.

[0072] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will readily appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. An automatic compensation device for electrode grinding of a projection welding machine, characterized in that: include: A cylinder (10) and a gripping rod (11) of a hollow structure, wherein the cylinder (10) is mounted on the bottom end of the gripping rod (11) through a cylinder connector (12), and an electrode cover (13) is mounted on the top end of the gripping rod (11) through an electrode holder (14), a positioning pin buckle assembly (15) is provided in the electrode holder (14), a nut positioning pin (16) is located at the center end of the electrode cover (13), and is connected to a positioning pin push rod (17) through a positioning pin buckle assembly (15), the positioning pin push rod (17) is located in the gripping rod (11), and is connected to the push rod of the cylinder (10), a magnetic scale sensor (18) for detecting the displacement of the push rod therein is installed on the cylinder barrel of the cylinder (10), and the magnetic scale sensor (18) is electrically connected to the workstation; The bottom end of the electrode holder (14) is integrally formed with a lower mounting cone (27), and the lower mounting cone (27) is inserted into the top end of the grip rod (11). The inner wall of the grip rod (11) is provided with an inclined surface (28) near the top end to accommodate the insertion of the lower mounting cone (27). A cooling chamber is provided in the electrode holder (14), and the water inlet (21) and the water outlet (22) are located at the same side end of the electrode holder (14) and are connected to the cooling chamber. The side end of the electrode holder (14) is provided with an external protrusion (29) near the cooling chamber, and the side end of the grip rod (11) is provided with a side fixing component (30) for limiting the external protrusion (29) near the top end. The side fixing assembly (30) comprises: a screw block 1 (31) and a screw block 2 (32) which are oppositely clamped at the side end of the handle (11) near the top position; a horizontal section of the side clamping plate (34) is clamped at the top of the outer protrusion (29); an action chamber (35) is located in the screw block 1 (31), a sliding seat (36) is slidably installed in the action chamber (35), and a vertical section of the side clamping plate (34) extends into the action chamber (35) and is connected to the sliding seat (36); two sets of side chambers (37 ) are symmetrically located in the sliding seat (36), and an air guide tube (38) is installed on the inner wall of the action chamber (35) and is penetrated in the side chamber (37). The sliding plug (39) is located in the side chamber (37) and is connected to the air guide tube (38); two sets of jet channels (40) are symmetrically distributed in the screw block (31) and are connected to the air guide tube (38). The air outlet end of the jet channel (40) is located at the top of the screw block (31) and is located below the outer protrusion (29); An air inlet (41) is provided at the end of the air guide tube (38) near the sliding plug (39), and the air outlet end of the jet channel (40) is provided in a closed-end type. An upper slide groove (42) connected to the action chamber (35) is provided at the top end of the screw block (31). The upper slider (43) is slidably connected in the upper slide groove (42) and is connected between the vertical section of the side clamp (34) and the sliding seat (36); Photoelectric detection components and electromagnetic correction components are distributed oppositely on the inclined surface (28). The photoelectric detection components and electromagnetic correction components are designed in four groups, and each group is distributed oppositely. Each group of photoelectric detection components includes two photoelectric switches (44) embedded and installed on the inclined surface (28) one above and one below. The side end of the lower mounting cone (27) is embedded with a lamp post (45) installed with an adaptation to the photoelectric switch (44). Each group of electromagnetic correction components includes a side mounting groove (46) opened on the inclined surface (28). Several groups of electromagnets (47) are arranged in sequence from top to bottom in the side mounting groove (46). A magnetic block (48) adapted to the electromagnet (47) is embedded and installed on the side end of the lower mounting cone (27). Several groups of electromagnets (47) are started in sequence from top to bottom or from bottom to top.

2. The automatic compensation device for electrode grinding of a projection welding machine according to claim 1, characterized in that: The cylinder connector (12) is mounted on the magnetic scale protective cover (19), and the cylinder (10) is located inside the magnetic scale protective cover (19).

3. The automatic compensation device for electrode grinding of a projection welding machine according to claim 1, characterized in that: The electrode cover (13) is threadedly connected to the top end of the electrode holder (14), and a grinding scale line is provided on the side end of the electrode cover (13) to facilitate observation of the grinding loss amount of the top end of the electrode cover (13).

4. The automatic compensation device for electrode grinding of a projection welding machine according to claim 1, characterized in that: The positioning pin buckle assembly (15) comprises: a buckle head (23), a slot (25) located at the top of the buckle head (23), a side end of the buckle head (23) provided with a notch (24) connected to the slot (25), the bottom end of the nut positioning pin (16) being set as a truncated cone structure and being clamped in the slot (25) from the notch (24), the top end of the positioning pin push rod (17) being connected to the bottom end of the buckle head (23), the bottom end of the positioning pin push rod (17) being connected to the cylinder connector (33) through the push rod lower limit buckle (26), and the cylinder connector (33) being mounted on the push rod of the cylinder (10).

5. The automatic compensation device for electrode grinding of a projection welding machine according to claim 1, characterized in that: The side mounting groove (46) is made of iron.

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