Automatic wheel rim welding device

Abstract

The application relates to the field of welding devices, in particular to an automatic wheel rim welding device, which comprises a welding device, a protection mechanism and the like, wherein the welding device comprises a mounting seat, a laser welding head and an exhaust head are mounted on the mounting seat; the protection mechanism comprises an annular block and a shielding plate arranged on the side of the mounting seat, the annular block is fixedly sleeved on the mounting seat, a cooling assembly for cooling the laser welding head is arranged on the annular block, and a first sliding groove is formed in the annular block; through the arrangement of the cooling assembly, the laser welding head can be cooled, the problems that the laser welding head is internally short-circuited due to excessively high temperature or the laser welding head is rapidly aged are avoided, through the arrangement of a sliding assembly, the shielding plate can be positionally adjusted according to the position of the wind, the wind shielding effect is increased, the protection gas discharged by the exhaust head is prevented from being blown away by the airflow, the production and welding of the wheel rim are not affected, and the blocked wind is blown to the cooling assembly to accelerate the cooling of the water in the cooling assembly.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of welding device, in particular to an automatic welding device for wheel rim. BACKGROUND

[0002] The new energy wheel rim is a rotating part between the new energy vehicle axle and the tire, which mainly consists of spokes and a rim, and the outer rim of the wheel rim is first wound into a ring shape in the production process, so that the two ends of the steel plate are in contact, and then the contact end is welded by using a laser welding device.

[0003] The laser welding device uses a high-energy-density laser beam as a heat source to rapidly melt the steel plate and form a molten pool. In this high-temperature environment, the molten metal is very active and prone to oxidation with oxygen in the air. Therefore, a protective gas is needed to isolate the molten pool from oxygen and create a flowing inert gas environment to prevent direct contact between the metal and oxygen, thereby reducing oxidation.

[0004] In hot summer, in order to increase the comfort of workers, the factory often uses open windows and ventilation and cooperates with multiple large floor fans to ventilate and cool down. When the wind speed is large, the wind blows to the protective gas exhaust port, disperses the protective gas, affects the protection of the molten pool by the protective gas, and thus affects the welding forming and weld quality.

[0005] Therefore, an automatic welding device for wheel rim is proposed. SUMMARY

[0006] In view of the above or the problem in the prior art that the factory often uses open windows and ventilation and cooperates with multiple large floor fans to ventilate and cool down, when the wind speed is large, the wind blows to the protective gas exhaust port, disperses the protective gas, affects the protection of the molten pool by the protective gas, and thus affects the welding forming and weld quality, the present application is proposed.

[0007] Therefore, the purpose of the present application is to provide an automatic welding device for wheel rim.

[0008] To solve the above technical problems, the present application provides the following technical solutions: including,

[0009] The welding device comprises a mounting seat, a laser welding head and an exhaust head mounted on the mounting seat;

[0010] The protection mechanism comprises an annular block and a shielding plate arranged on the side surface of the mounting seat, the annular block is fixedly sleeved on the mounting seat, the annular block is provided with a cooling assembly for cooling the laser welding head, and the annular block is provided with a first sliding groove, and the first sliding groove is provided with a plurality of sliding assemblies for adjusting the positions of the shielding plate and the cooling assembly.

[0011] As a preferred scheme of the automatic wheel rim welding device, the cooling assembly is arranged on the water tank on the side of the annular block close to the shielding plate, a water pump is arranged on the water tank, a first pipeline is connected to the water pump, a ring sleeve is connected to the end of the first pipeline away from the water pump, and the ring sleeve is in communication with the inside of the water tank through a second pipeline.

[0012] The ring sleeve is rotatably sleeved on the surface of the laser welding head.

[0013] As a preferred scheme of the automatic wheel rim welding device, the cooling assembly is arranged on the water tank on the side of the annular block close to the shielding plate, a water pump is arranged on the water tank, a first pipeline is connected to the water pump, a ring sleeve is connected to the end of the first pipeline away from the water pump, and the ring sleeve is in communication with the inside of the water tank through a second pipeline.

[0014] The first pipeline and the second pipeline are in communication with the inside of the flow guide groove.

[0015] As a preferred scheme of the automatic wheel rim welding device, the cooling assembly is arranged on the water tank on the side of the annular block close to the shielding plate, a water pump is arranged on the water tank, a first pipeline is connected to the water pump, a ring sleeve is connected to the end of the first pipeline away from the water pump, and the ring sleeve is in communication with the inside of the water tank through a second pipeline.

[0016] As a preferred scheme of the automatic wheel rim welding device, the cooling assembly is arranged on the water tank on the side of the annular block close to the shielding plate, a water pump is arranged on the water tank, a first pipeline is connected to the water pump, a ring sleeve is connected to the end of the first pipeline away from the water pump, and the ring sleeve is in communication with the inside of the water tank through a second pipeline.

[0017] The ends of the plurality of vertical rods away from the first sliding block are rotatably connected to the shielding plate and the water tank, respectively.

[0018] As a preferred scheme of the automatic wheel rim welding device, the cooling assembly is arranged on the water tank on the side of the annular block close to the shielding plate, a water pump is arranged on the water tank, a first pipeline is connected to the water pump, a ring sleeve is connected to the end of the first pipeline away from the water pump, and the ring sleeve is in communication with the inside of the water tank through a second pipeline.

[0019] As a preferred scheme of the automatic wheel rim welding device, the cooling assembly is arranged on the water tank on the side of the annular block close to the shielding plate, a water pump is arranged on the water tank, a first pipeline is connected to the water pump, a ring sleeve is connected to the end of the first pipeline away from the water pump, and the ring sleeve is in communication with the inside of the water tank through a second pipeline.

[0020] As a preferred scheme of the automatic wheel rim welding device, the cooling assembly is arranged on the water tank on the side of the annular block close to the shielding plate, a water pump is arranged on the water tank, a first pipeline is connected to the water pump, a ring sleeve is connected to the end of the first pipeline away from the water pump, and the ring sleeve is in communication with the inside of the water tank through a second pipeline.

[0021] As a preferred scheme of the automatic wheel rim welding device, the cooling assembly is arranged on the water tank on the side of the annular block close to the shielding plate, a water pump is arranged on the water tank, a first pipeline is connected to the water pump, a ring sleeve is connected to the end of the first pipeline away from the water pump, and the ring sleeve is in communication with the inside of the water tank through a second pipeline.

[0022] A plurality of positioning grooves are formed in the annular block, and the plurality of positioning grooves are matched with the positioning rod.

[0023] As a preferred scheme of the wheel rim automatic welding device, the second sliding block is connected with a stop plate at each of the two ends away from each other, the side of the two stop plates close to each other is arc-shaped and matched with the outer surface of the vertical rod.

[0024] The wheel rim automatic welding device has the following advantages: the cooling assembly is arranged to cool the laser welding head, so that the problems of internal short circuit of the laser welding head caused by excessively high temperature or rapid aging of the laser welding head are avoided; the sliding assembly is arranged to adjust the position of the shielding plate according to the position of the wind, so that the wind shielding effect is increased, the protection gas discharged by the exhaust head is prevented from being blown away by the airflow, and the production and welding of the wheel rim are affected, and the wind is blown to the cooling assembly, so that the wind power is reused, the water in the water tank is cooled without the aid of other cooling devices, resources are saved, and the cooling of the water in the cooling assembly is accelerated. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0026] Figure 1 It is a whole structure schematic view of the wheel rim automatic welding device.

[0027] Figure 2 It is a whole structure schematic view of the protection mechanism of the wheel rim automatic welding device.

[0028] Figure 3 It is a structure schematic view of the cooling assembly of the wheel rim automatic welding device.

[0029] Figure 4 It is a structure schematic view of the ring sleeve of the wheel rim automatic welding device.

[0030] Figure 5 It is a structure schematic view of the sliding assembly of the wheel rim automatic welding device.

[0031] Figure 6 It is a structure schematic view of the positioning assembly of the wheel rim automatic welding device.

[0032] In the figure: 1, welding equipment; 11, mounting seat; 12, laser welding head; 13, exhaust head;

[0033] 2, protection mechanism; 21, annular block; 211, positioning groove; 22, shielding plate; 23, cooling assembly; 231, water tank; 2311, cooling fin; 232, water pump; 233, first pipeline; 234, ring sleeve; 2341, flow guide groove; 235, second pipeline; 24, first sliding groove; 25, sliding assembly; 251, first sliding block; 252, vertical rod; 26, positioning assembly; 261, mounting groove; 262, second sliding block; 2621, stop plate; 263, first inclined surface; 264, first flat surface; 265, positioning rod; 266, second inclined surface; 267, second flat surface. DETAILED DESCRIPTION

[0034] In order to make the above-mentioned objectives, features and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0035] Embodiment 1, refer to Figures 1 to 6 For the first embodiment of the present application, the embodiment provides a kind of automatic welding device for wheel rim, can realize the effect of cooling laser welding head 12, it includes, welding equipment 1, it includes mounting seat 11, mounting seat 11 is equipped with laser welding head 12 and exhaust head 13, mounting seat 11 is provided with protection mechanism 2, protection mechanism 2 includes the annular block 21 and shielding plate 22 of being arranged in the side of mounting seat 11, annular block 21 is fixedly covered in mounting seat 11, annular block 21 is provided with cooling assembly 23 for cooling laser welding head 12, first sliding groove 24 is opened in annular block 21, first sliding groove 24 is provided with multiple sliding assemblies 25 for adjusting the position of shielding plate 22 and cooling assembly 23 inside;

[0036] Among them, mounting seat 11 is connected with manipulator or slide rail, when producing wheel rim, if it is to weld the both ends of the steel plate wound into annular, so that it becomes a circular ring, then only need to be installed on slide rail, drive mounting seat 11 linearly moves by slide rail, when repairing wheel or welding the turning point of right circle body and the outside of right support width plate, can be operated by manipulator;

[0037] Among them, laser welding head 12 is used for welding the place needing to be connected, laser welding head 12 is built-in lens, for focusing the laser beam transmitted to a very small area, so as to obtain higher power, melt metal;

[0038] The pipeline is connected with the exhaust head 13, one end of the pipeline away from the exhaust head 13 is connected with the gas cylinder, the protective gas of the gas cylinder is sprayed to the welding area through the pipeline and the exhaust head 13, the molten metal is protected from the oxygen and other reactive elements existing in the surrounding environment, the oxidation and pollution are prevented, the protective gas is argon, because of its inertness and high thermal conductivity, the argon is the most commonly used protective gas in laser welding, which is suitable for welding of austenitic stainless steel, carbon steel and titanium and other materials, and can also be helium, nitrogen or carbon dioxide;

[0039] The annular block 21 is detachably connected with the mounting seat 11 through threads, when the air temperature is low, such as in winter, the fan is not used, and the window is basically closed, the air volume is small, the protection mechanism 2 can not be used, at this time, the protection mechanism 2 can be removed, the gravity borne by the slide rail or the mechanical hand is reduced, and then the service life is increased;

[0040] The shielding plate 22 is translucent, in the laser welding process, due to the action of high temperature and high energy, the material particles of the welding area are evaporated and suspended in the air to form extremely fine solid particles or gel, the shielding plate 22 also has a protection effect, by setting the shielding plate 22 to be translucent, the welding condition is convenient for the staff to observe, and meanwhile, the shielding plate 22 can be hollow, so that the weight is reduced;

[0041] Through the setting of the cooling assembly 23, the laser welding head 12 can be cooled, the problems that the internal short circuit of the laser welding head 12 is caused due to the excessively high temperature or the laser welding head 12 is rapidly aged are avoided, through the setting of the sliding assembly 25, the position of the shielding plate 22 can be adjusted according to the position of the wind, the wind shielding effect is increased, the protective gas discharged by the exhaust head 13 is avoided from being blown away by the airflow, so that the welding of the steel ring of the vehicle wheel is affected, and meanwhile, the wind blocked is blown to the cooling assembly 23, so that the water in the cooling assembly 23 is accelerated to be cooled.

[0042] Further, the cooling assembly 23 is a water tank 231 arranged on one side of the annular block 21 close to the shielding plate 22, a water pump 232 is fixedly installed on the water tank 231, a first pipeline 233 is connected with the water pump 232, a ring sleeve 234 is connected with one end of the first pipeline 233 away from the water pump 232, the ring sleeve 234 is in communication with the inside of the water tank 231 through a second pipeline 235, and the ring sleeve 234 is rotatably sleeved on the surface of the laser welding head 12;

[0043] The water pump 232 is electrically controlled, and the water pump 232 can be controlled to be opened and closed by inputting data on the controller.

[0044] Further, a flow guide groove 2341 is arranged in the ring sleeve 234, the flow guide groove 2341 is annularly meandering, and the first pipeline 233 and the second pipeline 235 are in communication with the inside of the flow guide groove 2341.

[0045] By setting the guide groove 2341 to be meandering, the water flows inside the ring 234 for a longer time, increasing the heat absorption effect.

[0046] Further, the water tank 231 is provided with a cooling fin 2311, one end of the cooling fin 2311 is located inside the water tank 231, and the other end of the cooling fin 2311 is located outside the water tank 231.

[0047] When the water inside the guide groove 2341 flows out to the inside of the water tank 231 through the second pipe 235, the temperature of the water inside the water tank 231 rises, and the cooling fin 2311 is arranged to cool the water inside the water tank 231.

[0048] In this embodiment, the water tank 231 can be fixed on the mounting seat 11 or the annular block 21;

[0049] In use, when the laser welding head 12 is in use, the water pump 232 is turned on, the water pump 232 pumps the water inside the water tank 231 out and delivers it to the guide groove 2341 inside the ring 234 through the first pipe 233, the water moves inside the guide groove 2341, taking away the temperature on the surface of the laser welding head 12, cooling the laser welding head 12, avoiding the temperature being too high to cause internal short circuit of the laser welding head 12 or making the laser welding head 12 age quickly, after completion, the water flows back to the inside of the water tank 231 through the guide groove 2341, so that the temperature of the water inside the water tank 231 rises, and the cooling fin 2311 cools the water inside the water tank 231.

[0050] Embodiment 2, refer to Figures 2 to 6 , this embodiment provides a sliding assembly 25 of the automatic welding device for the steel ring of the vehicle wheel, which solves the problem of position adjustment of the shielding plate 22, the sliding assembly 25 includes a first sliding block 251 arranged inside the first sliding groove 24, a vertical rod 252 connected to one side of the first sliding block 251 close to the shielding plate 22, one end of the vertical rod 252 away from the first sliding block 251 penetrates out of the first sliding groove 24, and the ends of the plurality of vertical rods 252 away from the first sliding block 251 are respectively rotatably connected to the shielding plate 22 and the water tank 231.

[0051] The first sliding groove 24 is in inverted "convex" shape in section, the first sliding block 251 can slide inside the first sliding groove 24, and the first sliding block 251 is preferably a circular block. By limiting the shape of the first sliding block 251, the first sliding block 251 is facilitated to move inside the first sliding groove 24, and the service life of the device is increased. If the first sliding block 251 is in other shapes, such as being set as a rectangular block, the first sliding groove 24 is rectangular in plan view, that is, two vertical grooves and two horizontal grooves are formed. Since the length and width of the rectangular block are different, the contact areas of the first sliding block 251 with the horizontal grooves and the vertical grooves of the first sliding groove 24 are different, and thus the forces borne by the plurality of first sliding blocks 251 are different. When used for a long time, damage is easily caused. By setting the first sliding block 251 as a circular block, the contact area of the first sliding block 251 with the first sliding groove 24 is always equal when the first sliding block 251 moves inside the vertical grooves or the horizontal grooves, the service life of the first sliding block 251 is increased, and the first sliding block 251 is facilitated to pass through the corner below the sliding groove.

[0052] Further, the side of the shielding plate 22 away from the laser welding head 12 is arc-shaped, and the arc-shaped arrangement facilitates wind guiding.

[0053] Further, the protection mechanism 2 further comprises a positioning assembly 26 arranged on the vertical rod 252 and used for locking the sliding assembly 25.

[0054] Different from the first embodiment, in this embodiment, the cooling assembly 23 is connected with the annular block 21 through the sliding assembly 25, so that the cooling assembly 23 can be adjusted along with the position adjustment of the shielding plate 22, thereby enabling the shielding plate 22 to dissipate heat from the fins 2311 in any direction. Meanwhile, the fins 2311 are arranged horizontally.

[0055] In this embodiment, the vertical rods 252 of the plurality of sliding assemblies 25 can be connected through a connecting plate, that is, when one of the vertical rods 252 moves, the other vertical rods 252 move along with it.

[0056] In this embodiment, the positioning assembly 26 can be in any form, such as bolted, clamped, etc.

[0057] The remaining structures are the same as those in the first embodiment.

[0058] In use, according to the direction of the wind, the shielding plate 22 is pulled, the shielding plate 22 drives the first sliding block 251 to move in the first sliding groove 24 through the vertical rod 252, and the water tank 231 moves along with it; when the shielding plate 22 moves to the appropriate position, the vertical rod 252 is locked through the positioning assembly 26, and then the shielding plate 22 and the water tank 231 are locked, so that the shielding plate 22 can be adjusted according to the wind direction, shielding the wind from all directions, avoiding that the airflow blows away the protective gas discharged by the exhaust head 13, thereby affecting the normal production welding of the wheel rim, and the wind blown to the cooling fin 2311 blows off the dust adhered to the surface of the cooling fin 2311, avoiding that the dust affects the heat dissipation of the cooling fin 2311, and the wind accelerates the flow of air around the cooling fin 2311, increasing the heat dissipation effect of the cooling fin 2311, and then speeding up the cooling of the water in the water tank 231.

[0059] In summary, in this embodiment, a sliding device is provided, which adjusts the position of the shielding plate 22 in a manual manner, so that the shielding plate 22 can be adjusted according to the wind direction to shield the wind from all directions. The manual adjustment of the position of the shielding plate 22 is better than the electric adjustment. Although the electric adjustment can be directly set by data, the wind is invisible, unlike other visible things. Through the electric control adjustment, the worker can only feel the general direction of the wind first, and then control the system to adjust by judgment. The normal control system is a certain distance away from the welding position. If the judgment is wrong, the shielding plate 22 may need to be adjusted repeatedly several times to adjust to the best position, which is time-consuming and laborious. The manual adjustment allows the worker's hand to directly feel the device, so that the position of the shielding plate 22 can be adjusted directly and quickly. The wind blocked by the shielding plate can also act on the cooling fin 2311 to quickly cool the water in the water tank 231, realizing the application of wind power, and saving resources by not needing other cooling devices to cool the water in the water tank 231.

[0060] Embodiment 3, refer to Figures 2 to 6 The third embodiment of the present application is different from the previous embodiment in that the third embodiment provides a positioning assembly 26 of the wheel rim automatic welding device, which solves the problem of locking the sliding assembly 25 and the cooling assembly 23 connected to the sliding assembly 25 to the shielding plate 22. The positioning assembly 26 comprises installation grooves 261 opened on the first sliding block 251 and the vertical rod 252, the two installation grooves 261 are communicated, a second sliding block 262 is arranged in the installation groove 261, both ends of the second sliding block 262 penetrate out of the installation groove 261, a first inclined surface 263 and a first flat surface 264 are arranged on the second sliding block 262, a positioning rod 265 is slidably arranged in the installation groove 261, a second inclined surface 266 and a second flat surface 267 are arranged on the positioning rod 265, and a plurality of positioning grooves 211 are opened on the annular block 21 and matched with the positioning rod 265.

[0061] The first inclined surface 263 matches the second inclined surface 266, the second sliding block 262 is rectangular, and the mounting groove 261 matches the second sliding block 262, so that the positioning rod 265 can only move up and down in the vertical direction, and the second inclined surface 266 and the first inclined surface 263 are prevented from being misaligned.

[0062] Further, the two ends of the second sliding block 262 away from each other are connected with the stop plates 2621, the sides of the two stop plates 2621 close to each other are arc-shaped, and match the outer surface of the vertical rod 252.

[0063] The stop plates 2621 are arranged to ensure the stable connection between the second sliding block 262 and the vertical rod 252, and prevent disconnection, and the distance between the two stop plates 2621 matches the movement track of the second sliding block 262, that is, when one of the stop plates 2621 contacts the side surface of the vertical rod 252, the positioning rod 265 is located inside the mounting groove 261, and the vertical rod 252 can normally slide in the first sliding groove 24, and when the other stop plate 2621 contacts the side surface of the vertical rod 252, the positioning rod 265 penetrates out of the mounting groove 261 and enters the positioning groove 211, and under the limitation of the positioning groove 211, the vertical rod 252 cannot move, that is, the shielding plate 22 or the water tank 231 connected therewith cannot move.

[0064] The remaining structures are the same as those in Embodiment 2.

[0065] In use, when the shielding plate 22 is adjusted to the appropriate position, one of the stop plates 2621 is pushed to drive the second sliding block 262 to slide in the mounting groove 261, the first inclined surface 263 on the second sliding block 262 contacts the second inclined surface 266 on the positioning rod 265 to drive the positioning rod 265 to rise, so that the end of the positioning rod 265 away from the second sliding block 262 penetrates out of the mounting groove 261 and enters the corresponding positioning groove 211, and when the stop plate 2621 contacts the side surface of the vertical rod 252, the first flat surface 264 on the second sliding block 262 contacts the second flat surface 267 on the positioning rod 265 to lock the vertical rod 252, and in this state, due to the wind acting on the shielding plate 22, a pushing force is applied to the shielding plate 22, the shielding plate 22 transmits the pushing force to the positioning rod 265 through the vertical rod 252, so that the positioning rod 265 is more closely attached to the positioning groove 211.

[0066] Conversely, the other stop plate 2621 is pushed to misalign the first flat surface 264 and the second flat surface 267, and under the action of gravity of the positioning rod 265, the positioning rod 265 returns to the inside of the mounting groove 261 to unlock the vertical rod 252, and at this time, the shielding plate 22 can be pushed to move to adjust the position of the shielding plate 22.

[0067] It should be noted that the above examples are only used to illustrate the technical solutions of the present application but not to limit the present application. Although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or equivalently replaced, without departing from the spirit and scope of the technical solutions of the present application, and all these modifications and equivalents should be included in the scope of the claims of the present application.

Claims

1. An automatic welding device for wheel rims, characterized in that: include, Welding equipment (1) includes a mounting base (11) on which a laser welding head (12) and an exhaust head (13) are mounted; The protective mechanism (2) includes an annular block (21) and a baffle plate (22) disposed on the side of the mounting base (11). The annular block (21) is fixedly sleeved on the mounting base (11). A cooling component (23) for cooling the laser welding head (12) is provided on the annular block (21). A first sliding groove (24) is provided on the annular block (21). A plurality of sliding components (25) for adjusting the position of the baffle plate (22) and the cooling component (23) are provided inside the first sliding groove (24). The cooling assembly (23) is located in a water tank (231) on the side of the annular block (21) near the baffle plate (22). A water pump (232) is installed on the water tank (231). A first pipe (233) is connected to the water pump (232). A ring sleeve (234) is connected to the end of the first pipe (233) away from the water pump (232). The ring sleeve (234) is connected to the inside of the water tank (231) through a second pipe (235). The ring (234) is rotatably fitted onto the surface of the laser welding head (12); The ring (234) has a flow guide groove (2341) inside, and the flow guide groove (2341) is in a ring-shaped meandering shape; Both the first pipe (233) and the second pipe (235) are connected to the inside of the guide channel (2341); The water tank (231) is provided with a heat sink (2311), one end of the heat sink (2311) is located inside the water tank (231), and the other end of the heat sink (2311) is located outside the water tank (231); The wind blocked by the baffle (22) also acts on the heat sink (2311) to cool the water inside the water tank (231).

2. The automatic wheel rim welding device as described in claim 1, characterized in that: The sliding assembly (25) includes a first slider (251) disposed inside the first slide groove (24), and a vertical rod (252) is connected to the side of the first slider (251) near the baffle plate (22). The end of the vertical rod (252) away from the first slider (251) extends out of the first slide groove (24). The ends of the plurality of vertical rods (252) away from the first slider (251) are respectively rotatably connected to the baffle plate (22) and the water tank (231).

3. The automatic wheel rim welding device as described in claim 2, characterized in that: The side of the shield (22) away from the laser welding head (12) is arc-shaped.

4. The automatic wheel rim welding device as described in claim 3, characterized in that: The protective mechanism (2) also includes a positioning component (26) disposed on the vertical rod (252) for locking the sliding component (25).

5. The automatic wheel rim welding device as described in claim 4, characterized in that: The positioning component (26) includes a mounting groove (261) formed on the slider and the vertical rod (252), the two mounting grooves (261) are connected, a second slider (262) is provided inside the mounting groove (261), both ends of the second slider (262) extend out of the mounting groove (261), and a first inclined surface (263) and a first flat surface (264) are provided on the second slider (262).

6. The automatic wheel rim welding device as described in claim 5, characterized in that: The positioning component (26) further includes a positioning rod (265) slidably disposed inside the mounting groove (261), and the positioning rod (265) is provided with a second inclined surface (266) and a second plane (267). The annular block (21) has multiple positioning grooves (211), and each of the multiple positioning grooves (211) matches the positioning rod (265).

7. The automatic wheel rim welding device as described in claim 6, characterized in that: The two ends of the second slider (262) that are far apart from each other are connected to stop plates (2621). The two stop plates (2621) that are close to each other are arc-shaped and match the outer surface of the vertical rod (252).

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