CN219837381U

CN219837381U - Clamping mechanism and exhaust manifold welding device

Info

Publication number: CN219837381U
Application number: CN202321168771.2U
Authority: CN
Inventors: 张文硕; 杨凯; 王扬扬; 王璟琦
Original assignee: Airui Chengdu Emission Control Technology Co ltd
Current assignee: Airui Chengdu Emission Control Technology Co ltd
Priority date: 2023-05-15
Filing date: 2023-05-15
Publication date: 2023-10-17
Anticipated expiration: 2033-05-15

Abstract

The utility model discloses a clamping mechanism and an exhaust manifold welding device, wherein a limiting groove for placing a workpiece is formed at the far end of a supporting arm, and first hinging seats are arranged at two sides of an arm body of the supporting arm; the clamping jaw is arranged on two sides of the arm body of the supporting arm respectively, the jaw bodies of the clamping jaws are hinged to corresponding first hinging seats, an elastic element is arranged between each clamping jaw and the arm body of the supporting arm so that the jaw tail of the clamping jaw has an outward swinging trend, and the jaw heads of the clamping jaws inwards extend into the notch of the limiting groove and are used for compressing workpieces in the limiting groove.

Description

Clamping mechanism and exhaust manifold welding device

Technical Field

The utility model relates to the field of exhaust systems, in particular to a clamping mechanism and an exhaust manifold welding device.

Background

The exhaust gas generated during the gas combustion is discharged to the three-way catalyst through an exhaust manifold connected with the engine cylinder, and harmful gases such as CO, HC and NOx in the exhaust gas are converted into harmless carbon dioxide, water and nitrogen through oxidation and reduction by the three-way catalyst. Therefore, the exhaust manifold and the three-way catalyst assembly are an important part in an automobile exhaust system, the exhaust manifold is required to be provided with a heat shield bracket for fixing parts such as a sensor and the like, the common heat shield bracket is a thin hat-shaped part which is usually fixed on the exhaust manifold in a welding mode, the size is small, the strength is low, the clamping force and the clamping position of a conventional clamp are large, meanwhile, the size of the conventional clamp is large, when the exhaust manifold is required to be welded by a plurality of heat shield brackets, the space on a workbench is easy to interfere, therefore, the exhaust manifold is usually clamped firstly in the existing operation mode, and then a welding glove is worn for welding in a handheld mode, the welding precision cannot be accurately ensured in the mode, and meanwhile, after the welding seam is finished, the position deviation possibly occurs due to welding deformation; the welding is carried out in a mode of fixing in the earlier stage through the mode that the magnetism is inhaled to also have, adopts the mode that the magnetism is inhaled, can't realize accurate location, and magnetic force is generally lower simultaneously, can't resist the welding in-process mistake and bump and thermal stress shrink, still can't realize accurate location, simultaneously because can produce a large amount of heat in the welding process, transmits the magnet, makes the magnet appear rising the magnetic force decay that leads to easily. In the existing welding mode, quick clamping and positioning cannot be realized, and high clamping precision is achieved, so that the heat shield support is prone to position deflection, further subsequent assembly is affected, a large amount of manpower and material resources are wasted in post-welding correction, and the operation and the use of workers are inconvenient, and the working efficiency is reduced.

Disclosure of Invention

The utility model aims to provide a clamping mechanism and an exhaust manifold welding device, and aims to solve the problems in the prior art.

In order to achieve the above object, the present utility model provides a clamping mechanism, comprising:

the device comprises a support arm, wherein a limiting groove for placing a workpiece is formed in the distal end of the support arm, and first hinging seats are arranged on two sides of an arm body of the support arm;

the clamping jaw is arranged on two sides of the arm body of the supporting arm respectively, the jaw bodies of the clamping jaws are hinged to corresponding first hinging seats, an elastic element is arranged between each clamping jaw and the arm body of the supporting arm so that the jaw tail of the clamping jaw has an outward swinging trend, and the jaw heads of the clamping jaws inwards extend into the notch of the limiting groove and are used for compressing workpieces in the limiting groove.

The end face of the far end of the supporting arm is provided with four limiting blocks which are distributed in a rectangular shape, a cross groove is formed between the four limiting blocks, the cross groove comprises a central limiting groove and a yielding groove positioned on two sides of the limiting groove, and the yielding groove is used for yielding the claw heads of the clamping jaws.

The bottom of the limit groove is provided with a first protruding locating pin.

The first hinge seat is positioned between the elastic element and the distal end of the supporting arm, the first hinge seat comprises a pair of supporting seats, a mounting space of the supporting arm is formed between the two supporting seats, a mounting hole is formed in each supporting seat, a hinge pin is arranged on each supporting arm in a penetrating manner, and two ends of the hinge pin are supported in the mounting holes of the corresponding supporting seats; the elastic element is a polyurethane rubber block or a helical compression spring.

The tail of the claw gradually contracts outwards towards one side of the supporting arm.

The exhaust manifold welding device comprises a platform base and at least one clamping mechanism, wherein the clamping mechanism is arranged on a supporting mechanism on the platform base, a bearing plate is arranged on the platform base, a vertical plate is arranged on the bearing plate, and an exhaust manifold flange positioning plate is arranged on one side of the vertical plate;

the flange positioning plate is provided with a positioning plane for positioning the air inlet flange, and the positioning plane is provided with a second positioning pin;

the upper end and the lower end of the flange locating plate are respectively provided with a first pressing mechanism and a second pressing mechanism for pressing the air inlet flange on the flange locating plate.

The second locating pin is in a stepped shaft shape, the large-diameter section of the second locating pin is installed and matched in a locating hole on the vertical plate, a through hole for the small-diameter section of the second locating pin to penetrate out is correspondingly formed in the flange locating plate, the back side of the flange locating plate is pressed on the shoulder of the second locating pin, and the flange locating plate is fixedly connected with the vertical plate through a bolt and a pin.

The supporting mechanism comprises a first fixing seat, a sliding rail is arranged above the first fixing seat, a telescopic mechanism is arranged on one side of the sliding rail, a push block is arranged on the sliding rail in a sliding mode, the push block is connected with the output end of the telescopic mechanism, a connecting arm which is L-shaped is arranged on one side, away from the telescopic mechanism, of the push block, and one end, away from the sliding rail, of the connecting arm is fixedly connected with the supporting arm; the first fixing seat is connected with the bearing plate through the bearing seat.

The first pressing mechanism is connected with the vertical plate through a first supporting frame, and the second pressing mechanism is connected with the platform base through a second supporting frame; the compressing mechanism comprises a first linear driving piece, a second hinging seat is arranged on one side of the first linear driving piece, a first mandrel is connected to the output end of the first linear driving piece, a pressing block is hinged to one end of the first mandrel, a connecting rod is hinged to the middle of the pressing block, the connecting rod is hinged to the second hinging seat, and the free end of the pressing block extends to the side face of the flange locating plate.

The telescopic machanism includes second sharp driving piece, the output of second sharp driving piece is equipped with the second dabber, second dabber one end is provided with the connection the joint piece of ejector pad, and the other end passes telescopic machanism is connected with the articulated piece, articulated piece keep away from second sharp driving piece one end and articulate on adjustment handle's strip hole, be provided with the third hinge seat on the telescopic machanism of articulated piece below, third hinge seat one end with adjustment handle end articulates.

The utility model at least comprises the following beneficial effects:

the clamping mechanism is arranged, a limiting groove for placing a workpiece is arranged at the far end of the supporting arm, and the first hinging seat is used for hinging the clamping jaw; the two sides of the arm body of the supporting arm are respectively provided with a clamping jaw, the jaw bodies of the clamping jaws are hinged to corresponding first hinging seats, an elastic element is arranged between each clamping jaw and the arm body of the supporting arm so that the jaw tail of the clamping jaw has an outward swinging trend, and the jaw heads of the clamping jaws inwards extend into the notch of the limiting groove to be used for compressing workpieces in the limiting groove. The utility model has simple structure, compact volume, low cost and easy use. Through pressing the clamping jaw of support arm both sides for the jaw is opened, will need the work piece of clamp to put in the spacing inslot that the stopper encloses afterwards, then loosens according to the clamping jaw, and the clamping jaw is because of receiving elastic element's tension, makes the jaw of clamping jaw inwards tighten up, and then presss from both sides the work piece tight on the support arm, makes the work piece can not remove in processing or assembly process, and can place the work piece in specific position, so that processing is more accurate, need not to adjust repeatedly and just can make the work piece fix a position rapidly, auxiliary man-hour has been reduced, work efficiency has been improved, and labor cost has been reduced.

According to the utility model, the two exhaust manifold cases can be positioned on the same plane by arranging the flange positioning plate, so that the welding is convenient, the heat shield bracket is clamped by the clamping mechanism, and after the adjustment is finished, the exhaust manifold cases are more convenient to weld, do not deviate, and are convenient for operators to operate and use and the working efficiency is improved. The upper side and the lower side of the flange locating plate are respectively provided with the pressing mechanisms so that the air inlet flange is fixed on the flange locating plate, the upper end and the lower end of the air inlet flange are pressed by the pressing mechanisms, the front end and the rear end of the air inlet flange are prevented from tilting during welding, and the problems of deformation and the like during clamping of the exhaust manifold are avoided.

The utility model will be further described with reference to the drawings and the specific examples.

Drawings

Fig. 1 is a schematic structural view of an exhaust manifold welding device of the present utility model.

Fig. 2 is a schematic structural view of the clamping mechanism of the present utility model.

Fig. 3 is a schematic structural view of the support arm of the present utility model.

Fig. 4 is a schematic structural view of the clamping jaw of the present utility model.

Fig. 5 is a schematic structural view of the supporting mechanism of the present utility model.

Fig. 6 is a schematic structural view of the pressing mechanism of the present utility model.

Fig. 7 is a schematic structural view of the telescopic mechanism of the present utility model.

Fig. 8 is a schematic structural view of a first positioning pin of the present utility model.

Fig. 9 is an exploded view of the engagement structure of the flange positioning plate and the second positioning pin.

In the drawing, 100 is a supporting arm, 110 is a limiting groove, 111 is a limiting block, 120 is a first hinging seat, 130 is a clamping jaw, 131 is a clamping jaw, 132 is a clamping jaw, 133 is a clamping jaw body, 140 is an elastic element, 200 is a platform base, 210 is a vertical plate, 220 is a bearing plate, 230 is a bearing seat, 240 is a first supporting frame, 250 is a second supporting frame, 300 is a flange positioning plate, 310 is a positioning plane, 320 is a second positioning pin, 400 is a supporting mechanism, 410 is a first fixing seat, 420 is a sliding rail, 430 is a pushing block, 440 is a connecting arm, 500 is a first compacting mechanism, 510 is a first linear driving piece, 520 is a second hinging seat, 530 is a first mandrel, 540 is a pressing block, 550 is a connecting rod, 600 is a second compacting mechanism, 700 is a telescopic mechanism, 710 is a second linear driving piece, 720 is a second mandrel, 730 is a clamping block, 740 is a hinging block, 750 is a regulating handle, 760 is a third hinging seat, and 800 is a first positioning pin.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments.

In the description of the present utility model, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the present utility model and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

Referring to fig. 1-9, an embodiment of a clamping mechanism includes a support arm 100, a limiting groove 110 for placing a workpiece is provided at a distal end of the support arm 100, first hinge seats 120 are provided at both sides of an arm body of the support arm 100, the first hinge seats 120 are provided for hinging a clamping jaw 130, the first hinge seats 120 are located between the elastic element 140 and the distal end of the support arm 100, the first hinge seats 120 include a pair of support seats 121, a mounting space of the support arm 100 is formed between the two support seats 121, a mounting hole is provided on each support seat 121, a hinge pin is provided on the support arm 100 in a penetrating manner, and both ends of the hinge pin are supported in the mounting holes of the corresponding support seats 121, so that the clamping jaw 130 can be hinged by adopting the structure, and simultaneously, both side supporting forces are balanced.

The two sides of the arm body of the support arm 100 are respectively provided with a clamping jaw 130, the jaw body 133 of the clamping jaw 130 is hinged on the corresponding first hinging seat 120, an elastic element 140 is arranged between each clamping jaw 130 and the arm body of the support arm 100 so that the tail 131 of the clamping jaw 130 has an outward swinging trend, the compression elastic element 140 can be a compression spring or a polyurethane rubber block, as long as the compression elastic element 140 can provide outward force for the two clamping jaws 130 and can enable the two clamping jaws 130 to return to the original position after being pressed, and in particular, in the embodiment, the compression elastic element 140 is the polyurethane rubber block. The claw head 132 of the claw 130 extends inwards into the notch of the limit groove 110 to press the workpiece in the limit groove 110.

The first positioning pin 800 which is convex can be arranged at the bottom of the groove, the positioning of the nut on the heat shield bracket with the nut hole can be adapted through the first positioning pin 800, the nut is prevented from slightly moving in the length direction of the positioning groove, and the position precision of the nut in the welding process can be ensured; still further, the recess bottom sets up the mounting hole, first locating pin 800 is echelonment, the major diameter section installation of first locating pin 800 is with this mounting hole in, support arm 100 sets up the jackscrew that extends in the side direction, this jackscrew stretches into the mounting hole to with the annular joint on the major diameter section, the protruding constant head tank that stretches into of minor diameter of first locating pin 800.

The end face of the distal end of the support arm 100 may be provided with four rectangular limiting blocks 111, and a cross groove is formed between the four limiting blocks 111, where the cross groove includes a central limiting groove 110 and yielding grooves 112 located at two sides of the limiting groove 110, and the yielding grooves 112 are used for yielding the claw heads 132 of the clamping claws 130. The workpiece to be clamped is placed in the limiting groove 110, and then the limiting block 111 can prevent the workpiece in the limiting groove 110 from moving, so that clamping is firmer, the claw head 132 stretches into the limiting groove 110 through the yielding groove 112, and the clamping device is applicable to clamping of thin parts and meets positioning requirements.

The claw tail 131 gradually and outwards contracts towards the tail end of the supporting arm 100, and with the structure, enough swing movement stroke is ensured, so that the claw head 132 is larger in opening, and the workpiece can be conveniently taken and placed.

When the clamping jaw 130 is used, the two clamping jaws 130 are pressed first, so that the claw heads 132 of the clamping jaws 130 are opened, then a workpiece to be clamped is placed in the limiting groove 110 surrounded by the limiting block 111, finally the clamping jaws 130 are loosened, and the clamping jaws 130 are subjected to the tension of the compression elastic element 140, so that the claw heads 132 of the clamping jaws 130 are tightened inwards, and the workpiece is clamped and fixed.

The utility model also provides an embodiment of an exhaust manifold welding device, which comprises a platform base 200 and at least one clamping mechanism described in the embodiment, wherein the clamping mechanism is arranged on a supporting mechanism 400 on the platform base; the clamping mechanism quantity matches with need welded heat exchanger support, when needs carry out a plurality of heat exchanger supports, can set up a plurality of clamping structure and be used for pressing from both sides tight heat exchanger support.

The platform base 200 is provided with a bearing plate 220, the bearing plate 220 is provided with a vertical plate 210, and one side of the vertical plate 210 is provided with an exhaust manifold flange positioning plate 300;

a positioning plane 310 for positioning the air inlet flange is arranged on the flange positioning plate 300, and a second positioning pin 320 is arranged on the positioning plane 310; the air inlet flange is contacted with the positioning plane 310, and is fixed on the flange positioning plate 300 by the second positioning pin 320, and the error of the installation position and the direction of the air inlet flange can be prevented by the arrangement of the positioning pin, so that the purpose of positioning is achieved.

Preferably, the second positioning pin 320 is in a stepped shaft shape, the large-diameter section of the second positioning pin 320 is installed and matched in a positioning hole on the riser 210, the small-diameter section for the small-shaft section of the second positioning pin 320 to penetrate out is correspondingly arranged on the flange positioning plate, the back side of the flange positioning plate is tightly pressed on the shoulder part on the second positioning pin 320, and the flange positioning plate is fixedly connected with the riser 210 through bolts and pins.

The upper and lower ends of the flange locating plate 300 are respectively provided with a first pressing mechanism 500 and a second pressing mechanism 600 for pressing the air inlet flange on the flange locating plate 300. Through compressing tightly the upper and lower both ends of inlet flange with hold-down mechanism, let the pressure that inlet flange received more even, prevent the front and back both ends perk of inlet flange when the welding, avoided exhaust manifold to warp scheduling problem. Because the pressing mechanisms are arranged on the two sides of the air inlet flange, the problem that the air inlet flange turns over during sealing and poor sealing occurs can be avoided.

Further, the support mechanism 400 includes a first fixing seat 410, a sliding rail 420 is disposed above the first fixing seat 410, a telescopic mechanism 700 is disposed on one side of the sliding rail 420, a push block 430 is slidably disposed on the sliding rail 420, the push block 430 is connected with an output end of the telescopic mechanism 700, a connecting arm 440 in an L shape is disposed on one side of the push block 430 facing away from the telescopic mechanism 700, and one end of the connecting arm 440, away from the sliding rail 420, is fixedly connected with the support arm 100.

The first fixing base 410 is connected to the carrier 220 through the carrier 230. The supporting mechanism 400 is fixed through the bearing seat 230, and then the clamping mechanism connected with the supporting mechanism 400 is fixed.

Further, the first pressing mechanism 500 is connected to the riser 210 through a first supporting frame 240, and the second pressing mechanism 600 is connected to the platform base 200 through a second supporting frame 250; the first compression mechanism 500 and the second compression mechanism 600 are arranged through the first support frame 240 and the second support frame 250, so that the air inlet flange is fixed, and the front end and the rear end of the air inlet flange are prevented from tilting during welding. The first pressing mechanism 500 and the second pressing mechanism 600 may have the same structure, the pressing mechanism includes a first linear driving member 510, the first driving member may be an air cylinder, a hydraulic cylinder or an electric telescopic cylinder, one side of the first linear driving member 510 is provided with a second hinge seat 520, an output end of the first linear driving member 510 is connected with a first mandrel 530, one end of the first mandrel 530 is hinged with a pressing block 540, a connecting rod 550 is hinged in the middle of the pressing block 540, the connecting rod 550 is hinged with the second hinge seat 520, and a free end of the pressing block 540 extends to the side surface of the flange positioning plate 300. Through compressing tightly the upper and lower both ends of air inlet flange with hold-down mechanism, let the sticis that air inlet flange received more even, prevent the both ends perk around the air inlet flange when the welding, avoided when sealed exhaust manifold, the condition of exhaust manifold position skew to hold-down mechanism effect on air inlet flange this moment does not produce pressure to exhaust manifold, has also avoided exhaust manifold to warp simultaneously, appears quality problem. Because the pressing mechanisms are arranged on the two sides of the air inlet flange, the problem that the air inlet flange turns over during sealing and poor sealing occurs can be avoided.

Still further, the telescopic mechanism 700 includes a second linear driving member 710, the first driving member may be an air cylinder, a hydraulic cylinder or an electric telescopic cylinder, the output end of the second linear driving member 710 is provided with a second mandrel 720, one end of the second mandrel 720 is provided with a clamping block 730 connected with the push block 430, the other end passes through the telescopic mechanism 700 and is connected with a hinging block 740, one end of the hinging block 740 far away from the second linear driving member 710 is hinged on a strip hole of the adjusting handle 750, a third hinging seat 760 is provided on the telescopic mechanism 700 below the hinging block 740, and one end of the third hinging seat 760 is hinged with the tail end of the adjusting handle 750. The second mandrel 720 is extended out by operating the adjusting handle 750, the clamping block 730 connected to the second mandrel 720 pushes the pushing block 430, so that the connecting arm 440 slides on the sliding rail 420, and the supporting arm 100 connected to the connecting arm 440 is driven to move, before moving, the clamping jaws 130 on two sides of the supporting arm 100 can be pressed, the claw heads 132 of the clamping jaws 130 are opened, then the heat shield bracket on the exhaust manifold case is placed in the limit groove 110 on the connecting arm 440, finally the clamping jaws 130 are loosened, and the clamping jaws 130 clamp the heat shield bracket due to the tension of the polyurethane rubber block or the spring.

When the above scheme is adopted to weld the exhaust manifold, the first compression mechanism 500 and the second compression mechanism 600 are used for fixing the air inlet flange on the flange locating plate 300, and the support mechanism 400 is used for fixing and supporting the exhaust manifold. The staff installs flange locating plate 300 on riser 210, rotate briquetting 540 on the first hold-down mechanism 500, so that the inner of briquetting 540 will admit air flange upper end pressure tight, rotate briquetting 540 on the second hold-down mechanism 600 again, make the inner of briquetting 540 compress tightly the lower extreme of admit air flange, through compressing tightly the both ends around the flange that admits air, let the stiction that the flange received more even, both ends perk around the flange that admits air when preventing to weld, exhaust manifold position skew's condition has been avoided, and hold-down mechanism effect on the flange that admits air this moment. Then press clamping jaw 130 on the clamping mechanism for jaw 132 of clamping jaw 130 opens, then puts the heat exchanger support on the exhaust manifold case in limiting block 111 enclosed spacing groove 110, then unclamp according to clamping jaw 130, clamping jaw 130 is because of receiving elastic tension, make clamping jaw 130's jaw 132 inwards tighten up, and then press from both sides the heat exchanger support on support arm 100, make linking arm 440 remove on slide rail 420 through the adjustment handle 750 on operating support mechanism 400, and then make clamping mechanism remove, can reach the assigned position, and then saved a large amount of manpower and materials that the post-weld orthopedic needs, and make things convenient for the staff to operate and use and improved work efficiency.

The foregoing description is only a preferred embodiment of the present utility model, and the present utility model is not limited thereto, but it is to be understood that modifications and equivalents of some of the technical features described in the foregoing embodiments may be made by those skilled in the art, although the present utility model has been described in detail with reference to the foregoing embodiments. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

Claims

1. A clamping mechanism, comprising:

the device comprises a supporting arm (100), wherein a limiting groove (110) for placing a workpiece is formed in the far end of the supporting arm (100), and first hinging seats (120) are formed in two sides of an arm body of the supporting arm (100);

clamping jaws (130) are respectively arranged on two sides of an arm body of the supporting arm (100), jaw bodies (133) of the clamping jaws (130) are hinged to corresponding first hinge bases (120), elastic elements (140) are arranged between each clamping jaw (130) and the arm body of the supporting arm (100) so that jaw tails (131) of the clamping jaws (130) have outward swinging trend, and jaw heads (132) of the clamping jaws (130) inwards extend into notch parts of the limiting grooves (110) and are used for compressing workpieces in the limiting grooves (110).

2. The clamping mechanism according to claim 1, wherein four rectangular limiting blocks (111) are arranged on the distal end face of the supporting arm (100), cross grooves are formed between the four limiting blocks (111), each cross groove comprises a central limiting groove (110) and yielding grooves (112) located on two sides of the limiting groove (110), and the yielding grooves (112) are used for yielding the claw heads (132) of the clamping claws (130).

3. A clamping mechanism according to claim 1, wherein the groove bottom of the limit groove (110) is provided with a raised first positioning pin (800).

4. A clamping mechanism according to claim 1, wherein the first hinge seat (120) is located between the elastic element (140) and the distal end of the supporting arm (100), the first hinge seat (120) comprises a pair of supporting seats (121), a mounting space of the supporting arm (100) is formed between the two supporting seats (121), a mounting hole is formed in each supporting seat (121), a hinge pin is arranged on the supporting arm (100) in a penetrating manner, and two ends of the hinge pin are supported in the mounting holes of the corresponding supporting seats (121); the elastic element (140) is a polyurethane rubber block or a helical compression spring.

5. A clamping mechanism according to claim 1, wherein the tail (131) tapers outwardly towards a lateral tail end of the support arm (100).

6. An exhaust manifold welding device is characterized by comprising a platform base (200) and at least one clamping mechanism as claimed in any one of claims 1-5, wherein the clamping mechanism is arranged on a supporting mechanism (400) on the platform base, a bearing plate (220) is arranged on the platform base (200), a vertical plate (210) is arranged on the bearing plate (220), and an exhaust manifold flange positioning plate (300) is arranged on one side of the vertical plate (210);

a positioning plane (310) for positioning the air inlet flange is arranged on the flange positioning plate (300), and a second positioning pin (320) is arranged on the positioning plane (310);

the upper end and the lower end of the flange positioning plate (300) are respectively provided with a first pressing mechanism (500) and a second pressing mechanism (600) for pressing the air inlet flange on the flange positioning plate (300).

7. An exhaust manifold welding apparatus as claimed in claim 6, wherein,

the second locating pin (320) is in a stepped shaft shape, a large-diameter section of the second locating pin (320) is installed and matched in a locating hole on the vertical plate (210), a through hole for the small-diameter section of the second locating pin (320) to penetrate out is correspondingly formed in the flange locating plate, the back side of the flange locating plate is tightly pressed on a shoulder on the second locating pin (320), and the flange locating plate is fixedly connected with the vertical plate (210) through bolts and pins.

8. The exhaust manifold welding device according to claim 6, wherein the supporting mechanism (400) comprises a first fixing seat (410), a sliding rail (420) is arranged above the first fixing seat (410), a telescopic mechanism (700) is arranged on one side of the sliding rail (420), a push block (430) is arranged on the sliding rail (420) in a sliding manner, the push block (430) is connected with an output end of the telescopic mechanism (700), an L-shaped connecting arm (440) is arranged on one side, deviating from the telescopic mechanism (700), of the push block (430), and one end, far away from the sliding rail (420), of the connecting arm (440) is fixedly connected with the supporting arm (100); the first fixing base (410) is connected with the bearing plate (220) through the bearing base (230).

9. The exhaust manifold welding set as recited in claim 6, wherein said first hold-down mechanism (500) is coupled to said riser (210) via a first support frame (240), and said second hold-down mechanism (600) is coupled to said platform base (200) via a second support frame (250); the compressing mechanism comprises a first linear driving piece (510), a second hinging seat (520) is arranged on one side of the first linear driving piece (510), a first mandrel (530) is connected to the output end of the first linear driving piece (510), a pressing block (540) is hinged to one end of the first mandrel (530), a connecting rod (550) is hinged to the middle of the pressing block (540), the connecting rod (550) is hinged to the second hinging seat (520), and the free end of the pressing block (540) extends to the side face of the flange locating plate (300).

10. The exhaust manifold welding device according to claim 8, wherein the telescopic mechanism (700) comprises a second linear driving member (710), a second mandrel (720) is arranged at an output end of the second linear driving member (710), a clamping block (730) connected with the push block (430) is arranged at one end of the second mandrel (720), the other end of the second mandrel passes through the telescopic mechanism (700) and is connected with the hinge block (740), one end, far away from the second linear driving member (710), of the hinge block (740) is hinged on a strip hole of the adjusting handle (750), a third hinge seat (760) is arranged on the telescopic mechanism (700) below the hinge block (740), and one end of the third hinge seat (760) is hinged with the tail end of the adjusting handle (750).