A welding gun for steel body sheet metal repair machine

Abstract

The application discloses a welding gun for a steel body sheet metal repairing machine, and belongs to the technical field of welding devices, which comprises a surface gun body, an inner core assembly and a handle assembly, a welding electrode cable and a zero electrode cable are arranged in the handle assembly, the surface gun body is electrically connected with the zero electrode cable, the inner core assembly is electrically connected with the welding electrode cable, and a steel meson is arranged at the end of a conductive guide column in the inner core assembly; when the steel meson and the zero line contact the sheet metal at the same time, the end of the steel meson can be welded on the sheet metal through extremely high current, and the recessed part on the sheet metal can be pulled outwards by pulling the steel meson through a pulling hammer, so that the repairing work of the sheet metal is completed. Since the distance between the steel meson and the zero line contact is small, when the steel body sheet metal is repaired, only a small area of the damaged part of the body needs to be polished, and the sheet metal pulling repairing work can be carried out, so that the problem that the sheet metal needs to be polished on another part of the steel body and then connected with the zero line is avoided.

Description

Technical Field

[0001] This invention relates to the field of welding equipment technology, and in particular to a welding torch for a steel car body sheet metal repair machine. Background Technology

[0002] Spot welding guns are commonly used devices in automotive sheet metal repair, primarily for repairing automotive body panels.

[0003] Chinese patent CN222552426U discloses a single-hand / double-hand hammer-type spot welding gun. By incorporating a sliding rod and a sliding hammer at the front end of the gun body, after the welding unit is spot-welded onto sheet metal, the sliding hammer strikes the gun body, effectively acting as a pulling device. This integrates the pulling function, reducing reliance on a separate pulling mechanism and further improving the ease of use of the spot welding gun. Because this single-hand / double-hand hammer-type spot welding gun simultaneously possesses a grounding connection structure and a pulling function, it eliminates the need for external devices, enhancing the portability and convenience of the equipment.

[0004] The device achieves welding fixation by simultaneously contacting the sheet metal with the ring-shaped grounding unit at the end of the sliding rod and the welding unit. However, due to the limitations of the ring structure, when there are local high points, uneven surface grinding, residual oxide layer, or impurities around the sheet metal to be repaired, the ring-shaped grounding unit is prone to poor contact or intermittent connection with the sheet metal surface. This results in unstable welding circuit conduction and unreliable current transmission, thus affecting the welding quality and repair effect.

[0005] Therefore, it is necessary to provide a welding torch for a steel body sheet metal repair machine to solve the above-mentioned technical problems. Summary of the Invention

[0006] The purpose of this invention is to provide a welding torch for a steel car body sheet metal repair machine to solve the technical problems mentioned in the background art.

[0007] Based on the above ideas, the present invention provides the following technical solution: a welding torch for a steel body sheet metal repair machine, comprising a surface torch body, an inner core assembly and a handle assembly, wherein the handle assembly is provided with a welding pole cable and a neutral pole cable, the surface torch body is electrically connected to the neutral pole cable, the inner core assembly is electrically connected to the welding pole cable, the end of the conductive post in the inner core assembly is provided with a steel dielectric, and the end of the surface torch body is provided with at least one convex neutral contact that protrudes outward along the axial direction; The surface gun body includes a drawing guide post and a thick-walled cylinder fixed to the drawing guide post. The zero-pole battery cell located at the end of the thick-walled cylinder away from the drawing guide post is electrically connected to the zero-pole cable. The conductive post is coaxially disposed inside the drawing post and is insulated from the drawing post. A welding electrode core is disposed at the end of the thick-walled cylinder away from the neutral wire contact. The welding electrode core is insulated from the thick-walled cylinder. The welding electrode core is electrically connected to the welding electrode cable. A flexible conductive strip is connected between the end of the conductive post extending into the thick-walled cylinder and the welding electrode core.

[0008] As a further aspect of the present invention: the surface gun body and the handle assembly are connected by a quick-release assembly; The quick-release assembly includes a knob that is snapped into the thick-walled cylinder and rotatable relative to the thick-walled cylinder. The end of the knob away from the thick-walled cylinder is provided with multiple sets of first openings and second openings. The outer circular surface of the housing of the handle assembly is provided with a limit pin and an elastic pin. The limit pin is fixedly connected to the housing of the handle assembly, and the elastic pin is elastically connected to the housing of the handle assembly. The outer circular surface of the knob is provided with a guide groove that communicates with the first opening and is used to guide the sliding of the limiting pin. The inner wall of the guide groove is set as an inclined surface that gradually deepens along the circumference of the knob, so that when the knob is rotated, the limiting pin is pushed to move axially, so that the handle assembly and the surface gun body are pressed together. The limiting pin enters the knob through the second opening and rotates with the knob. The limiting pin pops up and gets stuck in the guide groove to lock the surface gun body and the handle assembly.

[0009] As a further aspect of the present invention: the inner wall of the guide groove protrudes outward to form a protrusion, the protrusion being used to cooperate with the limiting pin, so that the limiting pin generates a pre-tightening displacement along the axial direction, thereby forming an axial pre-tightening force between the handle assembly and the surface gun body, achieving rigid locking that prevents loosening and shaking.

[0010] As a further aspect of the present invention: the neutral contact can rotate about its axis relative to the pull guide post of the surface gun body, and a detection component is provided at the neutral contact. The detection component is configured to cooperate with the neutral contact so that the neutral contact is kept in a circumferential position in contact with the sheet metal.

[0011] As a further aspect of the present invention: one end of the neutral contact is integrally formed with an annular portion, the detection component includes a sliding sleeve fixed to the annular portion, a metal sleeve is fixedly sleeved on the pull-out guide post, the metal sleeve is electrically connected to the annular portion, and the neutral contact is elastically engaged with the metal sleeve through the annular portion. The end face of the metal sleeve near the neutral contact is provided with a slot for the sliding sleeve to be inserted, a protrusion is elastically connected to the inner wall of the slot, a spiral groove is opened on the outer circular surface of the sliding sleeve, and the end of the protrusion inserted into the spiral groove has a spherical structure.

[0012] As a further aspect of the present invention: a pin is provided at the metal sleeve, and a connecting post is coaxially connected to the end of the pin away from the sliding sleeve. The connecting post is elastically fitted with the metal sleeve along the diameter direction of the metal sleeve. A sliding rod is provided parallel to the axis of the metal sleeve. The sliding rod passes through a pre-set through groove on the connecting post, and a pressing member is fixed at the end of the sliding rod passing through the through groove. The bottom of the pressing member is set as an inclined surface. When the sliding rod moves relative to the connecting post along the axis of the metal sleeve, the pressure of the inclined surface on the connecting post can drive the pin to move along the diameter direction of the metal sleeve. The end of the sliding sleeve is provided with multiple sets of slots that cooperate with the pin. When the pin is inserted into the slot, it can circumferentially limit the sliding sleeve.

[0013] As a further aspect of the present invention: a through hole is provided at the end face of the metal sleeve away from the neutral contact. A first connector is insulated and a second connector is electrically connected in the through hole. The first connector is electrically connected to the conductive post through a metal wire. A protective shell is connected to one end of the metal sleeve, and an iron core is fixed inside the protective shell. The metal wire is spirally wound around the outside of the iron core, and the iron core is arranged opposite to the slide rod. When both the steel contact and the neutral contact are in contact with the sheet metal, the metal wire is in a conductive state and moves by attracting the slide rod through the magnetic field formed at the end of the iron core.

[0014] Compared with existing technologies, the advantages of this invention are as follows: When the steel contactor and the neutral contactor simultaneously contact the sheet metal, an extremely high current allows the end of the steel contactor to be welded to the sheet metal. By pulling the steel contactor with a pull hammer, the recessed portion on the sheet metal can be pulled outward, thus completing the sheet metal repair work. Because the distance between the steel contactor and the neutral contactor is small, only a small area of ​​the damaged part of the steel body needs to be ground during sheet metal repair to perform sheet metal pull repair work, thus avoiding the need to grind out sheet metal in another part of the steel body to reconnect the neutral wire. Attached Figure Description

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is an overall sectional view of the welding torch of the present invention; Figure 3 This is a schematic diagram of the inner core component structure of the present invention; Figure 4 This is a three-dimensional structural diagram of the welding torch of the present invention after it has been cut open; Figure 5 This is a schematic diagram of the flexible conductive strip structure of the present invention; Figure 6 This is a schematic diagram of the quick-release component structure of the present invention; Figure 7 This is the present invention. Figure 6 A magnified structural diagram at point A; Figure 8 This is a schematic diagram of the overall structure of the welding torch with detection components according to the present invention; Figure 9 This is a cross-sectional view of the detection component of the present invention; Figure 10 This is a schematic diagram of the fit between the pin and the sliding sleeve of the present invention; Figure 11 This is a schematic diagram of the fit between the pin and the sliding sleeve of the present invention.

[0017] In the picture: 1. Surface gun body; 101. Neutral contact; 102. Pull-out hammer; 103. Insulating guide sleeve; 104. Pull-out guide post; 105. Thick-walled cylinder; 106. Insulating long sleeve; 107. Metal flange; 2. Inner core assembly; 201. Zero electrode cell; 202. Welded electrode cell; 203. Connecting plate; 204. Insulating flange; 205. Flexible conductive strip; 206. Guide post; 207. Slider; 208. Conductive guide post; 209. Compression spring; 2010. Protective bushing; 2011. Stepped insulating sleeve; 3. Handle assembly; 301. Zero pole cable; 302. Welding pole cable; 303. Switch; 3031. Switch control wire; 304. Tightening sleeve; 305. Limit pin; 306. Spring pin; 4. Quick-release assembly; 401. Knob; 4011. First opening; 4012. Second opening; 4013. Guide groove; 4014. Protrusion; 5. Detection components; 501. Insulating sleeve; 502. Metal sleeve; 5021. Protrusion; 503. Conductive unit; 504. Sliding sleeve; 5041. Spiral groove; 5042. Slot; 505. Sliding rod; 506. Extrusion part; 5061. Inclined surface; 507. Pin; 508. Connecting post; 509. Second connector; 5010. First connector; 5011. Iron core; 5012. Rack; 5013. Connecting rod; 5014. Pull rod; 5015. Insulating sleeve; 5016. Turntable. Detailed Implementation

[0018] like Figures 1-11 As shown, a welding torch for steel body sheet metal repair machines is mainly used for repairing automotive steel body sheet metal. The welding torch consists of three parts: a surface torch body 1, an inner core assembly 2, and a handle assembly 3, wherein: The surface gun body 1 mainly includes a rod-shaped neutral wire contact 101, a pull-out guide post 104, and a thick-walled cylinder 105. Specifically, the neutral wire contact 101 is fixed to the pull-out guide post 104, the thick-walled cylinder 105 is disposed at the end of the pull-out guide post 104 away from the neutral wire contact 101, and both ends of the thick-walled cylinder 105 are fixedly mounted with metal flanges 107 by screws. Figures 2-3 As shown, the pull guide post 104 is fixed to the metal flange 107. When using this device, the neutral wire contact 101 makes close contact with the sheet metal to be repaired, and the current at the front end of the surface gun body 1 is conducted through the pull guide post 104, the metal flange 107 on one side of the thick-walled cylinder 105, and the thick-walled cylinder 105.

[0019] A limit spring is provided on the outer side of the pull guide post 104 to buffer the pull hammer 102 on the outer side of the pull guide post 104. A buffer pad is fixedly installed on the metal flange 107 near the neutral contact 101 to prevent the pull hammer 102 from hitting the metal flange 107.

[0020] The inner core assembly 2 mainly includes conductive guide posts 208, welded electrode cells 202, zero electrode cells 201, flexible conductive strips 205, and sliders 207, specifically: Combination Figures 2-5 As shown, the conductive post 208 is located inside the pull-out post 104 and is coaxially arranged with the pull-out post 104. Each end of the pull-out post 104 has an insulating sleeve 103, which is located between the pull-out post 104 and the conductive post 208.

[0021] An insulating long sleeve 106 is provided inside the thick-walled cylinder 105, and the slider 207 is disposed inside the insulating long sleeve 106 and can slide along the axial direction of the thick-walled cylinder 105. The inner core assembly 2 also includes a slider 207, a guide post 206, a compression spring 209, a protective bushing 2010, and two sets of insulating flanges 204; Two sets of insulating flanges 204 are fixed axially relative to each other inside the insulating long sleeve 106, and the guide post 206 is fixedly connected between the two sets of insulating flanges 204; The slider 207 is slidably sleeved on the guide post 206 and can move along the axial direction of the guide post 206; The protective bushing 2010 is fitted on the side of the guide post 206 near the front end of the insulating flange 204, which can prevent the slider 207 from hitting the insulating flange 204. The compression spring 209 is sleeved on the outside of the guide post 206, with its two ends abutting between the insulating flange 204 at the rear end and the slider 207, respectively, to provide axial elastic restoring force for the slider 207; The conductive guide post 208 extends into the thick-walled cylinder 105 and is fixedly connected to the slider 207 at one end, and moves axially synchronously with the slider 207.

[0022] With this structure, when the steel insert at the end of the conductive post 208 contacts the sheet metal, as the operator gradually pushes the surface gun body 1 through the handle assembly 3, the conductive post 208 can compress the spring 209 through the slider 207. The elastic force of the spring 209 compresses the steel insert, allowing it to stably contact the sheet metal without detaching.

[0023] The conductive post 208 passes through the insulating flange 204 and extends into the insulating sleeve 106, where it is fixed to the slider 207. A buffer pad is provided on the inner side of the insulating flange 204 near the neutral contact 101 to prevent the slider 207 from colliding with the insulating flange 204.

[0024] The welding electrode core 202 is located at the end of the conductive post 208 away from the neutral contact 101, and the welding electrode core 202 passes through the insulating flange 204 and the metal flange 107 and is inserted into the socket at the end of the handle assembly 3. Figure 3 As shown, the welding electrode core 202 is fixed to the insulating flange 204, and a stepped insulating sleeve 2011 is provided between the welding electrode core 202 and the metal flange 107, thereby insulating the welding electrode core 202 from the metal flange 107. Complete insulation between the conductive conductor path of the surface gun body 1 and the welding electrode conductive conductor path of the inner core assembly 2 is achieved through the two insulating guide sleeves 103 of the surface gun body 1, the insulating long sleeve 106, and the two sets of insulating flanges 204 and the stepped insulating sleeve 2011 of the inner core assembly 2.

[0025] An L-shaped connecting plate 203 is fixedly connected to the welding electrode cell 202. One end of the flexible conductive strip 205 is fixedly connected to the slider 207, and the other end of the flexible conductive strip 205 is fixed to the L-shaped connecting plate 203.

[0026] The zero-pole cell 201 is located outside the stepped insulating sleeve 2011 and is connected and fixed to the metal flange 107.

[0027] In summary, the sheet metal being repaired forms one path through the steel insert, conductive post 208, connecting slider 207, flexible conductive strip 205, connecting plate 203, and welding electrode core 202; the neutral contact 101, pull-out post 104, two sets of metal flanges 107, thick-walled cylinder 105, and neutral electrode core 201 form another path, and both paths converge at the handle assembly 3. When the steel insert and the neutral contact 101 simultaneously contact the sheet metal, the two paths become conductive and form a welding circuit. The extremely high current allows the end of the steel insert to be welded to the sheet metal. By pulling the steel insert with the pull-out hammer 102, the recessed part on the sheet metal can be pulled outward, thereby completing the sheet metal repair operation.

[0028] The steel contactor and the neutral contact 101 are integrated on the same front end of the gun head. The two are very close together and coaxially adjacent. This means that when repairing steel body sheet metal, only a very small area needs to be ground at the dented or damaged area to simultaneously meet the requirements for welding the steel contactor and making conductive contact with the neutral contact 101. There is no need to grind additional neutral points in other parts of the body or to connect an external neutral clamp. This fundamentally overcomes the shortcomings of traditional sheet metal repair equipment, which requires large-area grinding, additional grounding point searching, cumbersome operation, and easy damage to the body paint. It significantly simplifies the repair process, improves repair efficiency, and reduces body damage.

[0029] The handle assembly 3 mainly includes a neutral electrode cable 301, a welding electrode cable 302, a switch 303, and a switch control line 3031. Specifically, the welding electrode cell 202 is inserted into the welding electrode socket inside the handle assembly 3 and forms a conductive connection with the welding electrode cable 302 through a tightening sleeve 304 and a set screw.

[0030] The zero-pole cell 201 is inserted into the zero-pole socket in the handle assembly 3 and is also electrically connected to the zero-pole cable 301 through the tightening sleeve 304 and the set screw.

[0031] The switch 303 is connected to the switch control line 3031. Pressing the switch 303 is used to control the power supply of the circuit during welding with the special welding gun for steel body sheet metal repair machine.

[0032] The surface gun body 1 and the handle assembly 3 are connected by a quick-release assembly 4.

[0033] Specifically, the quick-release assembly 4 includes a knob 401, combined with... Figures 6-7 The knob 401 is provided with multiple sets of first openings 4011 and second openings 4012 at its end, and a through guide groove 4013 is provided on the outer circular surface of the knob 401, the guide groove 4013 being in communication with the first opening 4011. A limiting pin 305 and an elastic pin 306 are provided on the outer circular surface of the housing of the handle assembly 3. Specifically, the limiting pin 305 is fixedly connected to the housing of the handle assembly 3, and the elastic pin 306 is arranged radially along the housing of the handle assembly 3. A radial compression spring is provided between the elastic pin 306 and the housing of the handle assembly 3. Under the action of the compression spring, the elastic pin 306 maintains a normal state of radially extending outward, and can be radially compressed and retracted under the action of external force to achieve elastic expansion and contraction. The limiting pin 305 can enter the guide groove 4013 through the first opening 4011. The elastic pin 306 is compressed during the process of entering the knob 401. When the knob 401 rotates circumferentially to align the elastic pin 306 with the guide groove 4013, the elastic pin 306 pops out and inserts into the guide groove 4013. The cooperation between the elastic pin 306 and the guide groove 4013 can lock the surface gun body 1 and the handle assembly 3. The inner wall of the guide groove 4013 is set as an inclined surface that gradually deepens along the circumference of the knob 401, which is used to push the limit pin 305 to move axially when the knob 401 is rotated, so that the handle assembly 3 and the surface gun body 1 are pressed together.

[0034] One end of the knob 401 extends inward to form a snap-fit ​​portion, so that the knob 401 can be snapped onto one side of the metal flange 107.

[0035] from Figure 7 It can also be seen that the inner wall of the guide groove 4013 protrudes outward to form a protrusion 4014. The protrusion 4014 is an arc-shaped structure extending circumferentially, and its axial height first increases and then decreases along the rotation direction of the knob 401. When the knob 401 rotates and the limiting pin 305 passes the protrusion 4014, the protrusion 4014 gradually pushes the limiting pin 305 axially through the arc surface, so that the handle assembly 3 and the metal flange 107 are pressed together and elastically deformed. When the limiting pin 305 passes the highest point of the protrusion 4014, the housing of the handle assembly 3 elastically resets and forms an axial preload between the handle assembly 3 and the metal flange 107, thereby achieving a rigid locking of the handle assembly 3 and the inner core assembly 2 without gaps and preventing loosening.

[0036] In summary, this device can quickly connect the handle assembly 3 and the inner core assembly 2 through the quick-release component 4. When it is necessary to disconnect the two, simply press the elastic pin 306 and rotate the knob 401 in the opposite direction.

[0037] like Figure 1As shown, although the protruding neutral contact 101 can avoid grinding sheet metal on the other side of the steel body, in actual use, if it is necessary to adjust the position of the neutral contact 101 so that the neutral contact 101 contacts the exposed sheet metal, it may be necessary to adjust the welding gun. The tail of the welding gun is connected to the neutral pole cable 301 and the welding pole cable 302. When the welding gun is deflected to adjust the position of the neutral contact 101, the operator's wrist needs to overcome the force of the neutral pole cable 301 and the welding pole cable 302 on the welding gun, which makes the operation relatively strenuous.

[0038] Based on this, the solution sets the neutral contact 101 to be rotatable relative to the pull guide post 104, and a detection component 5 is provided at the neutral contact 101. When the neutral contact 101 automatically "finds" the conductive sheet metal position on the steel vehicle body, the detection component 5 can lock the neutral contact 101 circumferentially, so that the neutral contact 101 can maintain contact with the sheet metal.

[0039] Specifically, refer to Figures 8-11 As shown, one end of the neutral contact 101 has an integrally formed annular portion, which is coaxially sleeved on the outside of the pull-out guide post 104. The detection assembly 5 includes a sliding sleeve 504 fixed to the annular portion, which is disposed on the end of the annular portion away from the neutral contact 101. Figure 9 As can be seen, a metal sleeve 502 is fixedly sleeved on the pull-out guide post 104. The metal sleeve 502 is connected to the annular portion through a conductive unit 503, and an insulating sleeve 501 is provided between the metal sleeve 502 and the annular portion. The neutral contact 101 is elastically engaged with the metal sleeve 502 through the annular portion. For example, a spring can be sleeved on the outside of the sliding sleeve 504, so that the spring is connected between the annular portion and the metal sleeve 502. A slot for the sliding sleeve 504 to be inserted is provided on the end face of the metal sleeve 502 near the neutral contact 101, and a protrusion 5021 is elastically connected to the inner wall of the slot. Specifically, the end of the protrusion 5021 near the sliding sleeve 504 has a spherical structure, and the protrusion 5021 is elastically connected to the metal sleeve 502 along the diameter direction of the metal sleeve 502. Figure 10 As can be seen, a spiral groove 5041 is provided on the outer circular surface of the sliding sleeve 504. When the protrusion 5021 is inserted into the spiral groove 5041 and the sliding sleeve 504 slides relative to the metal sleeve 502, the sliding sleeve 504 can rotate along its own circumference, which is beneficial to adjusting the position of the neutral wire contact 101, so that the neutral wire contact 101 can automatically rotate to the sheet metal surface on the steel body.

[0040] Furthermore, to circumferentially limit the sliding sleeve 504, this design includes a pin 507 at the metal sleeve 502. A connecting post 508 is coaxially connected to the end of the pin 507 away from the sliding sleeve 504. The connecting post 508 elastically engages with the metal sleeve 502 along its diameter. A sliding rod 505 is arranged parallel to the axis of the metal sleeve 502. One end of the sliding rod 505 passes through the metal sleeve 502 and slides within it. The other end of the sliding rod 505 passes through a pre-set slot on the connecting post 508, and a pressing member 506 is fixed to the end of the sliding rod 505 passing through the slot. Figures 9-10 As shown, the bottom of the extrusion member 506 is set as an inclined surface 5061. When the slide rod 505 moves relative to the connecting column 508 along the axial direction of the metal sleeve 502, the pressure of the inclined surface 5061 on the connecting column 508 can drive the pin 507 to move along the diameter direction of the metal sleeve 502. from Figure 10 As can be seen, the end of the sliding sleeve 504 is provided with multiple sets of slots 5042 that cooperate with the pin 507. When the pressing member 506 drives the pin 507 to move and insert into the slot 5042, it can circumferentially limit the sliding sleeve 504, thereby preventing the neutral wire contact 101 from rotating.

[0041] A through hole is provided at the end face of the metal sleeve 502 away from the neutral contact 101. A first connector 5010 is fixedly installed in the through hole, and a second connector 509 is slidably connected thereto. Specifically, an insulating rubber sleeve is provided between the first connector 5010 and the metal sleeve 502, and the second connector 509 is electrically connected to the metal sleeve 502. Figure 9 As can be seen, a through circular hole is opened on the side wall of the pull guide post 104, and a blind hole is correspondingly provided on the outer circular surface of the conductive guide post 208. The end of the blind hole is electrically connected to the first connector 5010 through a metal wire. Of course, a columnar insulating sleeve 5015 is provided at the blind hole and the circular hole, so that the pull guide post 104 and the conductive guide post 208 are mutually insulated.

[0042] from Figure 9 As can be seen, a protective shell is connected to one end of the metal sleeve 502, and an iron core 5011 is fixed inside the protective shell. The aforementioned metal wire is spirally wound around the outside of the iron core 5011, and the iron core 5011 is positioned opposite to the slide rod 505. Specifically, the slide rod 505 is made entirely of non-conductive material, but a magnetic material, such as iron, is embedded at its end. When the metal wire is energized, a magnetic field is generated at the end of the iron core 5011, and the magnetic material at the end of the slide rod 505 attracts the slide rod 505, causing it to move.

[0043] In actual use, the metal wire circuit also connects to a battery and a resistor (the battery is detachably installed inside the protective casing), etc. Figure 9 , Figure 11 As shown, a detection circuit can be formed by a metal wire, a first connector 5010, a second connector 509, a metal sleeve 502, and a conductive unit 503, and the detection circuit is connected in parallel with the welding circuit of the welding torch.

[0044] Reference Figure 10 As shown, a turntable 5016 is provided on the outer side of the pin 507, and a pull rod 5014 is connected between the turntable 5016 and the second connector 509. A gear is fixedly sleeved on the outer side of the pin 507, and the gear is located on the outer side of the turntable 5016. Multiple sets of racks 5012 are fixed on the outer circular surface of the sliding sleeve 504. The racks 5012 are arranged on one side of the slots 5042, and the multiple sets of racks 5012 correspond one-to-one with the multiple sets of slots 5042.

[0045] In summary, during the repair process, the dented area of ​​the steel body is first ground to reveal sheet metal. The steel insert connected to one end of the conductive guide post 208 is then placed against the sheet metal. At this time, the neutral wire contact 101 is also against the surface of the steel body. When the neutral wire contact 101 is not in contact with the sheet metal, the detection circuit is not connected. As the worker presses the handle assembly 3 towards the steel body, both the steel insert and the neutral wire contact 101 will retract. As the neutral contact 101 retracts, the sliding sleeve 504 can move relative to the metal sleeve 502. Through the cooperation of the protrusion 5021 and the spiral groove 5041, the neutral contact 101 can be rotated. When the neutral contact 101 contacts the sheet metal, the detection circuit is energized (powered by the battery mentioned above), and the end of the iron core 5011 also forms a magnetic field and attracts the sliding rod 505. During the movement of the sliding rod 505, the inclined surface 5061 on the pressing member 506 can drive the pin 507 to move towards the side closer to the sliding sleeve 504. When one end of the pin 507 is inserted into the slot 5042, the sliding sleeve 504 and the neutral contact 101 stop rotating. At this time, the neutral contact 101 remains in contact with the sheet metal. During the process where the slider 207 inside the inner core assembly 2 contacts the protective bushing 2010 to restrict the movement of the handle assembly 3, the rack 5012 on the outer side of the sleeve 504 can move to the pin 507 and mesh with the gear on the outer side of the pin 507, thereby driving the pin 507 and the turntable 5016 to rotate. Through the provided pull rod 5014, the turntable 5016 can pull the second connector 509 to disengage it from the first connector 5010 during rotation, thereby causing the detection circuit to be in a disconnected state. This helps to prevent the detection circuit from being diverted from the welding circuit and affecting the welding effect of the welding torch. It should be noted that the end of the protrusion 5021 that is inserted into the spiral groove 5041 has a spherical structure. When the pin 507 is inserted into the slot 5042, the pressure of the side wall of the spiral groove 5041 on the protrusion 5021 can compress the protrusion 5021, causing the protrusion 5021 to move out of the spiral groove 5041. In addition, when the slider 207 contacts the protective bushing 2010, the pin 507 and the rack 5012 are in an overlapping state, which is beneficial to further limit the circumferential movement of the sleeve 504.

[0046] like Figure 8 As shown, a protective spring can be provided on the side of the protective shell near the puller 102, and a protective pad can be provided at the end of the metal flange 107 near the puller 102. This structure can prevent the puller 102 from impacting the metal flange 107 or the protective shell.

[0047] like Figure 9-10 As shown, in actual use, the second connector 509 can form a conductive connection with the metal sleeve 502 through a wire, or it can form a conductive connection through contact with the metal sleeve 502 itself.

[0048] The pin 507 is rotatably connected to the connecting post 508 at its top end, and a torsion spring can be fitted between the pin 507 and the connecting post 508 to allow the pin 507 to elastically engage with the connecting post 508 along its circumference. The metal sleeve 502 has a closed-end protruding tube on its cylindrical wall, and a spring connects the protruding tube to the connecting post 508 to allow the connecting post 508 to elastically engage with the metal sleeve 502. Similarly, the protrusion 5021 is installed in a groove on the inner wall of the metal sleeve 502, and a spring is provided between the end of the groove and the protrusion 5021.

[0049] The aforementioned conductive unit 503 may be an electric wire or a spiral-shaped and flexible conductive metal sheet.

[0050] Reference Figure 10As shown, a convex shaft is fixed to the top of the turntable 5016, and an L-shaped connecting rod 5013 is fixed to the end of the second connector 509. The convex shaft and the connecting rod 5013 pass through the ends of the pull rod 5014 and are rotatably engaged with it, so that both ends of the pull rod 5014 are hinged to the turntable 5016 and the second connector 509, respectively. The pull rod 5014 can be a plastic part or a rigid part. When the pull rod 5014 is a rigid part, the turntable 5016 needs to be circumferentially locked and axially slidingly engaged with the pin 507. Specifically, a keyway can be opened on the outer circumferential surface of the pin 507, and a key strip that slides with the keyway is provided on the turntable 5016.

[0051] The above-disclosed examples are merely preferred embodiments of this application, intended to facilitate understanding and implementation by those skilled in the art. However, they cannot be used to limit the scope of this application. Therefore, equivalent variations made in accordance with the scope of this application are still within the scope of this application. Furthermore, the outer surface of the components accessible to the aforementioned personnel must be coated with an insulating material.

Claims

1. A welding torch for a steel body sheet metal repair machine, comprising a surface torch body (1), an inner core assembly (2), and a handle assembly (3), wherein the handle assembly (3) is provided with a welding electrode cable (302) and a neutral electrode cable (301), the surface torch body (1) is electrically connected to the neutral electrode cable (301), and the inner core assembly (2) is electrically connected to the welding electrode cable (302), characterized in that: The conductive post (208) inside the inner core assembly (2) is provided with a steel plate at its end, and the end of the surface gun body (1) is provided with at least one convex zero line contact (101) that protrudes outward along the axial direction. The surface gun body (1) includes a pull guide post (104) and a thick-walled cylinder (105) fixed to the pull guide post (104). Both ends of the thick-walled cylinder (105) are fixedly installed with metal flanges (107). The pull guide post (104) is fixed to the metal flanges (107). The zero-pole cell (201) located at the end of the thick-walled cylinder (105) away from the pull guide post (104) is electrically connected to the zero-pole cable (301). The conductive post (208) is coaxially disposed inside the pull-out post (104) and insulated from the pull-out post (104). A welding electrode core (202) is disposed at the end of the thick-walled cylinder (105) away from the neutral contact (101). The welding electrode core (202) is insulated from the thick-walled cylinder (105). The welding electrode core (202) is electrically connected to the welding electrode cable (302). The conductive post (208) extends to the thick-walled cylinder. A flexible conductive strip (205) is connected between one end of the thick-walled cylinder (105) and the welding electrode core (202); a slider (207) is slidably arranged inside the thick-walled cylinder (105) along its axial direction; an L-shaped connecting plate (203) is fixedly connected to the welding electrode core (202); one end of the flexible conductive strip (205) is fixedly connected to the slider (207), and the other end of the flexible conductive strip (205) is fixedly connected to the L-shaped connecting plate (203); The steel dielectric at the end of the conductive guide post (208), the conductive guide post (208), the slider (207), the flexible conductive strip (205), the connecting plate (203), and the welded electrode core (202) form one path; the neutral contact (101), the pull-out guide post (104), the two sets of metal flanges (107), the thick-walled cylinder (105), and the zero electrode core (201) form another path, and both paths converge at the handle assembly (3); The neutral contact (101) is rotatable about its axis relative to the pull guide post (104) of the surface gun body (1), and a detection component (5) is provided at the neutral contact (101). The detection component (5) is configured to cooperate with the neutral contact (101) so that the neutral contact (101) is held in a circumferential position in contact with the sheet metal.

2. The welding torch for a steel car body sheet metal repair machine according to claim 1, characterized in that: The surface gun body (1) and the handle assembly (3) are connected by a quick-release assembly (4); The quick-release assembly (4) includes a knob (401) that is snapped into the thick-walled cylinder (105) and rotatable relative to the thick-walled cylinder (105). The knob (401) is provided with multiple sets of first openings (4011) and second openings (4012) at one end away from the thick-walled cylinder (105). The outer circular surface of the housing of the handle assembly (3) is provided with a limiting pin (305) and an elastic pin (306). The limiting pin (305) is fixedly connected to the housing of the handle assembly (3), and the elastic pin (306) is elastically connected to the housing of the handle assembly (3). The outer surface of the knob (401) is provided with a guide groove (4013) that communicates with the first opening (4011) and is used to guide the sliding of the limiting pin (305). The inner wall of the guide groove (4013) is set as an inclined surface that gradually deepens along the circumference of the knob (401) to push the limiting pin (305) to move axially when the knob (401) is rotated, so that the handle assembly (3) and the surface gun body (1) are pressed together. The elastic pin (306) enters the knob (401) through the second opening (4012) and rotates with the knob (401) in the circumference. The elastic pin (306) springs up and gets stuck in the guide groove (4013) to lock the surface gun body (1) and the handle assembly (3).

3. The welding torch for a steel car body sheet metal repair machine according to claim 2, characterized in that: The inner wall of the guide groove (4013) protrudes outward to form a protrusion (4014), which is used to cooperate with the limiting pin (305) to make the limiting pin (305) generate a pre-tightening displacement along the axial direction, so as to form an axial pre-tightening force between the handle assembly (3) and the surface gun body (1) to achieve rigid locking that prevents loosening and shaking.

4. The welding torch for a steel car body sheet metal repair machine according to claim 1, characterized in that: The neutral contact (101) has an integrally formed annular portion at one end. The detection component (5) includes a sliding sleeve (504) fixed to the annular portion. A metal sleeve (502) is fixedly sleeved on the pull-out guide post (104). The metal sleeve (502) is electrically connected to the annular portion. The neutral contact (101) is elastically engaged with the metal sleeve (502) through the annular portion. A slot for the sliding sleeve (504) to be inserted is provided on the end face of the metal sleeve (502) near the neutral contact (101). A protrusion (5021) is elastically connected to the inner wall of the slot. A spiral groove (5041) is provided on the outer circular surface of the sliding sleeve (504). The end of the protrusion (5021) inserted into the spiral groove (5041) has a spherical structure.

5. The welding torch for a steel car body sheet metal repair machine according to claim 4, characterized in that: A pin (507) is provided at the metal sleeve (502). A connecting post (508) is coaxially connected to the end of the pin (507) away from the sliding sleeve (504). The connecting post (508) is elastically fitted with the metal sleeve (502) along the diameter direction. A sliding rod (505) is provided parallel to the axis of the metal sleeve (502). The sliding rod (505) passes through a pre-set through groove on the connecting post (508), and a pressing member (506) is fixed to the end of the sliding rod (505) passing through the through groove. (506) The bottom is set as an inclined surface (5061). When the slide rod (505) moves relative to the connecting post (508) along the axis of the metal sleeve (502), the pressure of the inclined surface (5061) on the connecting post (508) can drive the pin (507) to move along the diameter direction of the metal sleeve (502). The end of the slide sleeve (504) is provided with multiple sets of slots (5042) that cooperate with the pin (507). When the pin (507) is inserted into the slot (5042), it can limit the slide sleeve (504) circumferentially.

6. The welding torch for a steel car body sheet metal repair machine according to claim 5, characterized in that: The metal sleeve (502) has a through hole at one end face away from the neutral contact (101). A first connector (5010) is insulated inside the through hole and a second connector (509) is electrically connected to it. The first connector (5010) is electrically connected to the conductive post (208) through a metal wire. A protective shell is connected to one end of the metal sleeve (502), and an iron core (5011) is fixed inside the protective shell. The metal wire is spirally wound around the outside of the iron core (5011), and the iron core (5011) is opposite to the slide rod (505). When the steel plate and the neutral contact (101) are both in contact with the sheet metal, the metal wire is in a conductive state and moves by attracting the slide rod (505) through the magnetic field formed at the end of the iron core (5011).

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