Automatic multi-point welding machine for outer cover of range hood

Abstract

The invention discloses an automatic multi-point welding machine for an outer cover of a range hood. The automatic multi-point welding machine comprises a welding platform, a welding mechanism, a welding sliding seat and a lifting mechanism. A holding mechanism and a positioning mechanism which are symmetrically arranged are arranged on the welding sliding seat, and a holding seat, a pressing plate, pushing assemblies which are symmetrically arranged and a plurality of limiting assemblies which are arranged between the two pushing assemblies are arranged in the holding mechanism. According to the automatic multi-point welding machine for the outer cover of the range hood, the position of the pressing plate can be accurately controlled through the independently-arranged pushing assembly, and therefore the position of the side plate can be better limited by being matched with a positioning mechanism. And in addition, the required number can be started according to the size of the range hood outer cover needing to be welded through cooperation with the independently-arranged limiting assembly, the positions of the side plates and the cover body can be better limited, and welding of a welding head is facilitated. And meanwhile, the pushing assembly and the limiting assembly can independently achieve self-locking, the stability in the welding process is guaranteed, and the situation that the precision of welding work is affected due to sudden failure of an air cylinder is avoided.

Description

Technical Field

[0001] The invention relates to welding technology, in particular to an automatic multi-spot welding machine for a range hood outer cover. Background Art

[0002] A range hood, also known as a range hood, is a kitchen appliance that purifies the kitchen environment. Installed above the kitchen stove, it quickly extracts waste from stove combustion and harmful cooking fumes, exhausting them outdoors. This reduces pollution, purifies the air, and provides safety features such as anti-toxic and explosion protection.

[0003] The range hood housing consists of a housing and side panels attached to it. The housing and side panels are welded together to create a complete system. During welding, the housing and side panels must be positioned to ensure accurate welding. Manual positioning welding, when performed continuously, is labor-intensive, inefficient, and lacks precision. Using pneumatic cylinders for direct positioning can lead to failure, affecting the position of the housing and side panels during welding, resulting in poor weld accuracy and quality. Summary of the Invention

[0004] In order to solve the defects of the above-mentioned prior art, the present invention proposes an automatic multi-spot welding machine for the range hood cover.

[0005] The technical solution of the present invention is achieved as follows:

[0006] An automatic multi-spot welding machine for a range hood cover, characterized by comprising:

[0007] A welding platform, wherein a welding mechanism is provided at the rear end of the welding platform, and the welding mechanism is composed of a welding frame and a plurality of welding modules arranged on the welding frame;

[0008] A welding slide is provided on the welding platform, wherein the welding slide is provided with a symmetrically arranged holding mechanism and a positioning mechanism, wherein

[0009] The positioning mechanism is provided with a first positioning seat, a second positioning seat and a third positioning seat, and the first positioning seat, the second positioning seat and the third positioning seat are respectively driven by a first cylinder to change the distance between them and the holding mechanism;

[0010] The holding mechanism is provided with a holding seat, a pressure plate, a symmetrically arranged pushing assembly and a plurality of limit assemblies arranged between two pushing assemblies. The pressure plate is arranged between the holding seat and the positioning mechanism, and the pushing assembly and the limit assemblies are arranged on the holding seat.

[0011] The pushing assembly is provided with a pushing member and a limiting member, the limiting member is arranged at the upper end of the pushing member, the pushing member is provided with a first tooth, the limiting member is provided with a second tooth cooperating with the first tooth, the retaining seat is provided with a second cylinder cooperating with the pushing member, the second cylinder is provided with a pushing block, the pushing block is hingedly connected to the pushing member, the second cylinder pushes the pushing member to rotate, and the maintaining pushing member pushes the pressure plate close to the positioning mechanism,

[0012] The limiting assembly is provided with a mounting piece and a pressure piece. The pressure piece is sleeved on the mounting piece. A tension spring is provided between the pressure piece and the mounting piece.

[0013] In the present invention, the welding slide is provided with a fixed rod that cooperates with the pressure plate, the fixed rod is provided with a symmetrically arranged guide rod, the guide rod is sleeved with a first spring, the first spring is arranged between the fixed rod and the pressure plate, and the pressure plate is provided with a guide hole that cooperates with the guide rod.

[0014] In the present invention, the pushing assembly is further provided with symmetrically arranged mounting plates, and a movable area is formed between the mounting plates. The pushing member and the limiting member are arranged in the movable area. The limiting member is hinged to the mounting plate through a first hinge rod, and the pushing member is hinged to the mounting plate through a second hinge rod.

[0015] In the present invention, the limiting member consists of an unlocking end and a rotating end, the unlocking end is arranged above the rotating end, an unlocking seat is provided on the mounting plate, the unlocking seat is in contact with the unlocking end, and a first electromagnetic member is provided in the middle of the unlocking seat.

[0016] In the present invention, a locking protrusion cooperating with the pushing member is provided on the rotating end, the second tooth is provided on the locking protrusion, a receiving hole is provided in the middle of the limiting member, the first hinged rod is arranged in the receiving hole, a torsion spring is provided in the receiving hole, the torsion spring is sleeved on the first hinged rod, one end of the torsion spring is connected to the inside of the receiving hole, and the other end is connected to a mounting plate.

[0017] In the present invention, the pressure member is composed of a sliding body, a connecting body and a pressure member. The pressure member is composed of a pressure end and a hinged end. A third hinge rod is provided in the middle of the hinged end. The third hinge rod is connected to the upper end of the tension spring. A sliding hole is formed in the middle of the sliding body, and the mounting member is arranged in the sliding hole.

[0018] In the present invention, a cavity is formed at the upper end of the mounting member, a fourth hinge rod is provided in the cavity, and the tension spring is located in the cavity and maintains the lower end connected to the fourth hinge rod.

[0019] In the present invention, an active chamber is provided on the sliding body, the active chamber is connected to the sliding hole, a movable part is provided in the active chamber, the movable part is hinged in the active chamber through a fifth hinged rod, the upper end of the movable part is provided with a third tooth, and the upper end of the mounting part is provided with a fourth tooth that cooperates with the third tooth.

[0020] In the present invention, the third tooth is provided with a first plane and a first inclined surface, and the first plane is arranged at the lower end of the first inclined surface. The fourth tooth is provided with a second plane matching the first plane and a second inclined surface matching the first inclined surface, and the second plane is arranged at the lower end of the second inclined surface.

[0021] In the present invention, a second spring and a second electromagnetic member are provided in the movable chamber, the second spring contacts the lower end of the movable member, and the second electromagnetic member is provided at the lower end of the second spring.

[0022] The automatic multi-spot welding machine for range hood covers of the present invention has the following beneficial effects: A separately provided push assembly precisely controls the position of the pressure plate, thereby effectively cooperating with the positioning mechanism to limit the position of the side panels. Furthermore, the separately provided limit assembly can be used to activate the required number of welds based on the size of the range hood being welded, effectively limiting the position of the side panels and the cover body and facilitating welding. Furthermore, both the push assembly and the limit assembly are independently self-locking, ensuring stability during welding and preventing sudden cylinder failure that could affect welding accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a structural schematic diagram of the automatic multi-spot welding machine for range hood covers of the present invention;

[0024] Figure 2 for Figure 1 Schematic diagram of the welding platform structure;

[0025] Figure 3 for Figure 1 Schematic diagram of welding mechanism structure;

[0026] Figure 4 for Figure 1 Schematic diagram of the lifting mechanism structure;

[0027] Figure 5 for Figure 1 Schematic diagram of the range hood cover structure;

[0028] Figure 6 for Figure 5 Schematic diagram of the side panel structure;

[0029] Figure 7This is a schematic structural diagram of the welding slide, holding mechanism and positioning mechanism in the present invention;

[0030] Figure 8 This is a schematic structural diagram of the welding slide and positioning mechanism in the present invention;

[0031] Figure 9 for Figure 7 Schematic diagram of the holding mechanism structure;

[0032] Figure 10 for Figure 9 Exploded diagram;

[0033] Figure 11 for Figure 9 A schematic diagram of the structure in another direction;

[0034] Figure 12 for Figure 10 Schematic diagram of the push component structure in ;

[0035] Figure 13 for Figure 12 Schematic diagram of the structure of the pushing member and the limiting member;

[0036] Figure 14 for Figure 12 A top view of

[0037] Figure 15 for Figure 14 Cross-sectional view at BB in ;

[0038] Figure 16 for Figure 9 Schematic diagram of the limit component structure in;

[0039] Figure 17 for Figure 16 The main perspective view;

[0040] Figure 18 for Figure 17 A partial enlarged view of point C in the figure.

[0041] In the figure: welding platform 1, welding mechanism 2, welding slide 3, lifting mechanism 4, welding frame 5, welding module 6, welding head 7, range hood cover 8, adjustment assembly 9, handle 10, slide rail 11, drive member 12, fixing bracket 13, lifting frame 14, lifting cylinder 15, matching rod 16, lifting rod 17, positioning cylinder 18, first positioning block 19, second positioning block 20, cover body 21, side plate 22, first edge 23, second edge 24 , third edge 25, fourth edge 26, holding mechanism 27, positioning mechanism 28, roller 29, positioning ring 30, position cylinder 31, holding seat 32, first positioning seat 33, second positioning seat 34, third positioning seat 35, first cylinder 36, pressure plate 37, pushing component 38, limiting component 39, holding hole 40, mounting member 41, support plate 42, pushing member 43, limiting member 44, first tooth 45, second tooth 46, second cylinder Cylinder 47, push block 48, mounting plate 49, active area 50, first hinge rod 51, second hinge rod 52, unlocking end 53, rotating end 54, unlocking seat 55, first electromagnetic member 56, first magnet 57, locking protrusion 58, receiving hole 59, torsion spring 60, hinge arm 61, strip hole 62, sixth hinge rod 63, fixing rod 64, guide rod 65, first spring 66, guide hole 67, pressure member 68, tension spring 69, sliding body 70 , connecting body 71, pressure body 72, pressure end 73, hinged end 74, third hinged rod 75, sliding hole 76, cavity 77, fourth hinged rod 78, movable chamber 79, movable part 80, fifth hinged rod 81, third tooth 82, fourth tooth 83, first plane 84, first inclined surface 85, second plane 86, second inclined surface 87, second spring 88, second electromagnetic component 89, second magnet 90, installation gap 91, welding gap 92. DETAILED DESCRIPTION

[0042] The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present invention.

[0043] like Figures 1 to 18 As shown, the automatic multi-spot welding machine for range hood covers of the present invention comprises a welding platform 1, a welding mechanism 2, a welding slide 3, and a lifting mechanism 4. The welding platform 1 is used to support the welding slide 3 and install the lifting mechanism 4, and the welding platform 1 is arranged in the middle of the welding mechanism 2.

[0044] The welding mechanism 2 is located at the rear end of the welding platform 1 and consists of a welding frame 5 and multiple welding modules 6 mounted on the welding frame 5. Each welding module 6 is equipped with multiple independently movable welding heads 7, each of which can be individually controlled by a pneumatic cylinder to change its position. When the range hood cover 8 reaches the center of the lower welding frame 5, it activates the individual cylinders, moving the welding heads 7 downward to achieve spot welding.

[0045] An adjusting component 9 is provided on the welding module 6 at one of the side positions, and a handle 10 can be rotated to change the position of the welding module 6, so as to achieve welding according to range hood covers 8 of different widths.

[0046] A symmetrically arranged slide rail 11 is provided in the middle of the welding platform 1, and driving members 12 are respectively provided at one end of the two slide rails 11. The two driving members 12 are rotationally symmetrically arranged. One driving member 12 is responsible for driving the welding slide 3 to move to the middle of the welding mechanism 2, and then the other driving member 12 moves the completed welding slide 3 to the lifting mechanism 4.

[0047] A symmetrical fixed bracket 13 is provided on the middle outer side of the welding platform 1, and a lifting mechanism 4 is provided on the fixed bracket 13. The lifting mechanism 4 is used to lift the welding slide 3 that has been welded to facilitate the passage of the welding slide 3 to be welded. This can save time for installing the range hood cover 8 and time for removing the range hood cover 8 that has been welded. Two welding slides 3 are used alternately. When one welding slide 3 is installing or removing the range hood cover 8, the other welding slide 3 can be kept in the welding operation.

[0048] The lifting mechanism 4 is provided with a lifting frame 14, a lifting cylinder 15, a matching rod 16, and a lifting rod 17. The lifting rod 17 is connected to the lifting cylinder 15. The matching rod 16 is provided at both ends of the lifting rod 17. The lifting cylinder 15 is provided on the lifting frame 14. Positioning cylinders 18 are provided at both ends of the lifting rod 17. The positioning cylinder 18 is provided with a first positioning block 19, and the welding slide 3 is provided with a second positioning block 20 that matches the first positioning block 19. When the positioning cylinder 18 is pushed, the first positioning block 19 and the second positioning block 20 can be matched, so that the telescopic rod on the positioning cylinder 18 is placed in the middle of the second positioning block 20, thereby lifting the entire welding slide 3 through the lifting cylinder 15.

[0049] The range hood cover 8 is composed of a cover body 21 and side panels 22 arranged on both sides of the cover body 21. Figure 6 As shown, the side panel 22 is provided with a first edge 23, a second edge 24, a third edge 25, and a fourth edge 26. The first edge 23 and the second edge 24 are arranged vertically, and the height of the first edge 23 is greater than that of the second edge 24. The third edge 25 is arranged horizontally, while the fourth edge 26 is arranged at an angle. Before welding, the first edge 23, the second edge 24, the third edge 25, and the fourth edge 26 are placed inside the cover 21, so that the cover 21 covers the first edge 23, the second edge 24, the third edge 25, and the fourth edge 26, achieving an aesthetic effect and facilitating spot welding.

[0050] The welding slide 3 is mounted on the welding platform 1 and is provided with a symmetrically arranged holding mechanism 27 and positioning mechanism 28. The lower end of the welding slide 3 is provided with multiple rollers 29 that cooperate with the slide rail 11, and one side of the welding slide 3 is provided with a positioning ring 30 that cooperates with the drive member 12. The holding mechanism 27 is provided on the outside, and the positioning mechanism 28 is provided on the inside.

[0051] Position cylinders 31 are provided on both sides of the welding slide 3. The position cylinders 31 are used to push the holding seat 32. A guide rail can be provided at the lower end of the holding seat 32 so that the entire holding mechanism 27 can move its position.

[0052] A gear is provided on the driving member 12, and a rack that cooperates with the gear is provided on the slide rail 11. The gear is driven to rotate by the driving member 12, so that the driving member 12 moves along the rack. A cylinder is also provided on the driving member 12, which can cooperate with the positioning ring 30 and insert a positioning pin to enable the driving member 12 to drive the welding slide 3 to move.

[0053] The positioning mechanism 28 is equipped with a first positioning seat 33, a second positioning seat 34, and a third positioning seat 35. The first positioning seat 33, the second positioning seat 34, and the third positioning seat 35 are each driven by a first cylinder 36 to change the distance between them and the retaining mechanism 27. The first positioning seat 33 is used to secure the upper side of the range hood cover 8 and the side panel 22, while the second positioning seat 34 secures the side panel 22, and the third positioning seat 35 secures the lower side of the range hood cover 8 and the side panel 22. The first positioning seat 33, the second positioning seat 34, and the third positioning seat 35 are each controlled by a different first cylinder 36 to independently control their positions. The first positioning seat 33, the second positioning seat 34, and the third positioning seat 35 can all be pushed toward the retaining mechanism 27, reducing the distance between them. This secures the side panel 22 in the middle, facilitating the placement of the cover body 21. Finally, the cover body 21 is pressurized by the limit assembly 39.

[0054] The retaining mechanism 27 is provided with a retaining seat 32, a pressure plate 37, a symmetrically arranged pushing assembly 38 and a plurality of limiting assemblies 39 arranged between two pushing assemblies 38. The pressure plate 37 is arranged between the retaining seat 32 and the positioning mechanism 28, and the pushing assembly 38 and the limiting assembly 39 are arranged on the retaining seat 32.

[0055] The retaining seat 32 is provided with a plurality of retaining holes 40, and the mounting members 41 in the position limiting assembly 39 are disposed in the retaining holes 40 and then can be fixed with bolts. The retaining seat 32 is provided with a support plate 42, and the second cylinder 47 is disposed on the support plate 42.

[0056] The pushing assembly 38 is provided with a pushing member 43 and a limiting member 44. The limiting member 44 is provided at the upper end of the pushing member 43. The pushing member 43 is provided with a first tooth 45, and the limiting member 44 is provided with a second tooth 46 that cooperates with the first tooth 45. The retaining seat 32 is provided with a second cylinder 47 that cooperates with the pushing member 43. The second cylinder 47 is provided with a pushing block 48. The pushing block 48 is hingedly connected to the pushing member 43. The second cylinder 47 pushes the pushing member 43 to rotate, and the pushing member 43 is kept to push the pressure plate 37 close to the positioning mechanism 28.

[0057] The push assembly 38 is further provided with symmetrically arranged mounting plates 49, forming a movable area 50 between the mounting plates 49. The push member 43 and the limit member 44 are arranged within the movable area 50. The limit member 44 is hinged to the mounting plates 49 via a first hinge rod 51, and the push member 43 is hinged to the mounting plates 49 via a second hinge rod 52.

[0058] The limiting member 44 comprises an unlocking end 53 and a rotating end 54. The unlocking end 53 is positioned above the rotating end 54. An unlocking seat 55 is provided on the mounting plate 49 and contacts the unlocking end 53. A first electromagnetic member 56 is positioned in the center of the unlocking seat 55. A first magnet 57 is positioned in the center of the unlocking end 53. When energized, the first electromagnetic member 56 pushes the first magnet 57, thereby pushing the unlocking end 53, separating the first tooth 45 from the second tooth 46. This allows the second cylinder 47 to pull the pusher 43 to rotate about the second hinge rod 52.

[0059] The rotating end 54 is misaligned with the centerline of the first hinged rod 51. A locking protrusion 58 is provided on the rotating end 54, which engages with the pusher 43. The locking protrusion 58 is provided with a second tooth 46. A receiving hole 59 is provided in the center of the stopper 44. The first hinged rod 51 is positioned within the receiving hole 59. A torsion spring 60 is disposed within the receiving hole 59. The torsion spring 60 is sleeved over the first hinged rod 51. One end of the torsion spring 60 is connected to the interior of the receiving hole 59, and the other end is connected to a mounting plate 49. The torsion spring 60 maintains contact between the first magnet 57 and the first electromagnetic member 56. Furthermore, when the second cylinder 47 pushes the pusher 43 toward the pressure plate 37, the torsion spring 60 keeps the first tooth 45 past the second tooth 46, causing the stopper 44 to rotate slightly, maintaining the separation between the first magnet 57 and the first electromagnetic member 56. The stopper 44 then automatically resets under the elastic force of the torsion spring 60.

[0060] The lower end of the pusher 43 is provided with a symmetrically arranged hinge arm 61, which is provided with a strip hole 62. A sixth hinge rod 63 is disposed within the strip hole 62. The sixth hinge rod 63 is hingedly connected to the pusher block 48. Since the pusher block is always in a horizontal position, the strip hole 62 can keep the sixth hinge rod 63 movable therein, thereby achieving better rotation of the pusher 43.

[0061] The welding slide 3 is equipped with a fixed rod 64 that mates with the pressure plate 37. The fixed rod 64 is symmetrically mounted with a guide rod 65. A first spring 66 is sleeved on the guide rod 65 and disposed between the fixed rod 64 and the pressure plate 37. The pressure plate 37 is provided with a guide hole 67 that mates with the guide rod 65. When the pressure plate 37 is pushed by the pusher 43, the first spring 66 is compressed. After the pusher 43 is pulled by the second cylinder 47, the pressure plate 37 is reset under the elastic force of the first spring 66, preventing the pressure plate 37 from contacting the side plate 22.

[0062] The limiting assembly 39 is provided with a mounting member 41 and a pressure member 68 . The pressure member 68 is sleeved on the mounting member 41 . A tension spring 69 is provided between the pressure member 68 and the mounting member 41 .

[0063] The pressure member 68 comprises a sliding body 70, a connecting body 71, and a pressure member 72. The pressure member 72 comprises a pressure end 73 and a hinge end 74. A third hinge rod 75 is provided in the middle of the hinge end 74 and is connected to the upper end of the tension spring 69. A sliding hole 76 is formed in the middle of the sliding body 70, and the mounting member 41 is disposed within the sliding hole 76. A rubber block may be provided at the lower end of the pressure end 73 for cushioning and protecting the cover 21.

[0064] A cavity 77 is formed at the upper end of the mounting member 41 , and a fourth hinge rod 78 is disposed in the cavity 77 . The tension spring 69 is located in the cavity 77 and maintains its lower end connected to the fourth hinge rod 78 .

[0065] A movable chamber 79 is provided on the sliding body 70, and the movable chamber 79 is connected to the sliding hole 76. A movable part 80 is provided in the movable chamber 79, and the movable part 80 is hinged in the movable chamber 79 through a fifth hinge rod 81. The upper end of the movable part 80 is provided with a third tooth 82, and the upper end of the mounting part 41 is provided with a fourth tooth 83 that cooperates with the third tooth 82.

[0066] The third tooth 82 is provided with a first plane 84 and a first inclined surface 85, and the first plane 84 is arranged at the lower end of the first inclined surface 85. The fourth tooth 83 is provided with a second plane 86 that cooperates with the first plane 84 and a second inclined surface 87 that cooperates with the first inclined surface 85, and the second plane 86 is arranged at the lower end of the second inclined surface 87.

[0067] When the pressure member 68 moves upward, the tension spring 69 is stretched, while simultaneously maintaining the engagement and limiting position of the third and fourth teeth 82 and 83 on the movable member 80. The first and second inclined surfaces 85 and 87 on the third and fourth teeth 82 and 83 ensure that the fourth tooth 83 does not block the third tooth 82 when the pressure member 68 moves upward, and that the first and second flat surfaces 84 and 86 restrict the pressure member 68 when it moves downward.

[0068] A second spring 88 and a second electromagnetic member 89 are disposed within the movable chamber 79. The second spring 88 contacts the lower end of the movable member 80, and the second electromagnetic member 89 is disposed at the lower end of the second spring 88. A second magnet 90 is disposed at the lower end of the movable member 80, which cooperates with the second electromagnetic member 89. When the second electromagnetic member 89 is energized, it attracts the second magnet 90, compressing the second spring 88 and keeping the third tooth 82 disengaged from the fourth tooth 83. Under the tension of the tension spring 69, the pressure member 68 rapidly acts on the cover 21.

[0069] like Figure 7 As shown, before welding, the pressure member 68 is first pulled up so that the height of the pressure member 72 is higher than the height of the first positioning seat 33 and the second positioning seat 34. Then, the side panel 22 to be welded is placed in the installation gap 91 between the holding mechanism 27 and the positioning mechanism 28. The cover body 21 is then placed on the first positioning seat 33, the second positioning seat 34 and the third positioning seat 35. The first cylinder 36 is then started to push the first positioning seat 33, the second positioning seat 34 and the third positioning seat 35. The position cylinder 31 is also started to push the holding mechanism 27 toward the positioning mechanism 28. The position cylinder 31 is only used to move the holding seat 32, while the second cylinder 47 is used to control the position of the pressure plate 37 to achieve more precise position movement, ensure that the cover body 21 does not exceed the side panel 22, facilitate welding, and achieve an aesthetic effect. There is no need for later edge grinding. Finally, the second electromagnetic member 89 is energized to attract the second magnet 90, and the tension spring 69 is maintained to pull the pressure member 68 down, so that it presses the cover 21. There is a welding gap 92 between the pressure members 68 to facilitate welding of the welding module 6.

[0070] When disassembling the welded range hood cover 8, the position cylinder 31 can be directly started to pull the retaining seat 32 to move, the first electromagnetic component 56 is energized to push the first magnet 57, the first cylinder 36 and the second cylinder 47 are reset, and after the pressure body 72 moves out of the edge of the range hood cover 8, the welded range hood cover 8 can be taken out.

[0071] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An automatic multi-spot welding machine for range hood cover, characterized in that: include: A welding platform, wherein a welding mechanism is provided at the rear end of the welding platform, and the welding mechanism is composed of a welding frame and a plurality of welding modules arranged on the welding frame; A welding slide is provided on the welding platform, wherein the welding slide is provided with a symmetrically arranged holding mechanism and a positioning mechanism, wherein The positioning mechanism is provided with a first positioning seat, a second positioning seat and a third positioning seat, and the first positioning seat, the second positioning seat and the third positioning seat are respectively driven by a first cylinder to change the distance between them and the holding mechanism; The holding mechanism is provided with a holding seat, a pressure plate, a symmetrically arranged pushing assembly and a plurality of limit assemblies arranged between two pushing assemblies. The pressure plate is arranged between the holding seat and the positioning mechanism, and the pushing assembly and the limit assemblies are arranged on the holding seat. The pushing assembly is provided with a pushing member and a limiting member, the limiting member is arranged at the upper end of the pushing member, the pushing member is provided with a first tooth, the limiting member is provided with a second tooth cooperating with the first tooth, the retaining seat is provided with a second cylinder cooperating with the pushing member, the second cylinder is provided with a pushing block, the pushing block is hingedly connected to the pushing member, the second cylinder pushes the pushing member to rotate, and the maintaining pushing member pushes the pressure plate close to the positioning mechanism, The limiting assembly is provided with a mounting piece and a pressure piece. The pressure piece is sleeved on the mounting piece. A tension spring is provided between the pressure piece and the mounting piece.

2. The automatic multi-spot welding machine for range hood cover according to claim 1, characterized in that: The welding slide is provided with a fixing rod that cooperates with the pressure plate, the fixing rod is provided with a symmetrically arranged guide rod, the guide rod is sleeved with a first spring, the first spring is arranged between the fixing rod and the pressure plate, and the pressure plate is provided with a guide hole that cooperates with the guide rod.

3. The automatic multi-spot welding machine for range hood cover according to claim 1, characterized in that: The pushing assembly is also provided with symmetrically arranged mounting plates, and a movable area is formed between the mounting plates. The pushing member and the limiting member are arranged in the movable area. The limiting member is hinged to the mounting plate through a first hinge rod, and the pushing member is hinged to the mounting plate through a second hinge rod.

4. The automatic multi-spot welding machine for range hood cover according to claim 3, characterized in that: The limiting member consists of an unlocking end and a rotating end. The unlocking end is arranged above the rotating end. An unlocking seat is provided on the mounting plate. The unlocking seat contacts the unlocking end. A first electromagnetic member is provided in the middle of the unlocking seat.

5. The automatic multi-spot welding machine for range hood cover according to claim 4, characterized in that: The rotating end is provided with a locking protrusion that cooperates with the pushing member, and the locking protrusion is provided with the second tooth. A receiving hole is provided in the middle of the limiting member, and the first hinge rod is arranged in the receiving hole. A torsion spring is provided in the receiving hole, and the torsion spring is sleeved on the first hinge rod. One end of the torsion spring is connected to the inside of the receiving hole, and the other end is connected to a mounting plate.

6. The automatic multi-spot welding machine for range hood cover according to claim 1, characterized in that: The pressure member is composed of a sliding body, a connecting body and a pressure member. The pressure member is composed of a pressure end and a hinged end. A third hinge rod is provided in the middle of the hinged end. The third hinge rod is connected to the upper end of the tension spring. A sliding hole is formed in the middle of the sliding body, and the mounting member is arranged in the sliding hole.

7. The automatic multi-spot welding machine for range hood cover according to claim 6, characterized in that: A cavity is formed at the upper end of the mounting member, a fourth hinge rod is provided in the cavity, and the tension spring is located in the cavity and keeps the lower end connected to the fourth hinge rod.

8. The automatic multi-spot welding machine for range hood cover according to claim 7, characterized in that: The sliding body is provided with an active chamber, which is connected to the sliding hole. A movable part is provided in the active chamber, and the movable part is hinged in the active chamber through a fifth hinged rod. The upper end of the movable part is provided with a third tooth, and the upper end of the mounting part is provided with a fourth tooth that cooperates with the third tooth.

9. The automatic multi-spot welding machine for range hood cover according to claim 8, characterized in that: The third tooth is provided with a first plane and a first inclined surface, the first plane is arranged at the lower end of the first inclined surface, the fourth tooth is provided with a second plane matching the first plane and a second inclined surface matching the first inclined surface, the second plane is arranged at the lower end of the second inclined surface.

10. The automatic multi-spot welding machine for range hood cover according to claim 9, characterized in that: A second spring and a second electromagnetic member are provided in the movable chamber. The second spring contacts the lower end of the movable member. The second electromagnetic member is provided at the lower end of the second spring.

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