Exhaust fume collecting hood welding equipment

Abstract

The utility model relates to exhaust fume collecting hood welding equipment which comprises inner supporting mechanisms, a side pressing mechanism, a downward pressing mechanism and a pressing mechanism. The shape of the corresponding end face of each inner supporting block of each inner supporting mechanism is matched with the inner surface of the corresponding corner; the shape of the corresponding end face of each side pressing block of each side pressing mechanism is matched with the outer side face of the corresponding corner, and the shape of the bottom face of each lower pressing block of each lower pressing mechanism is matched with the outer top face of the corresponding corner. In the working state, the inner supporting blocks abut against the inner sides of the corresponding corners respectively, and the side pressing blocks, the lower pressing blocks and the pressing pieces abut against the outer sides of the corresponding corners respectively. Compared with the prior art, reliable positioning of the corner of the exhaust fume collecting hood can be achieved, inward sinking of the corner in the welding process can be effectively avoided, in addition, all the pressing pieces press the welding position of the back side of the corresponding corner from back to front so that bent edges on the two sides of a welding seam can be flush, and therefore the laser welding quality is guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model relates to welding equipment field especially relates to a fume hood welding equipment. BACKGROUND

[0002] The fume hood is the main part of the range hood, which is generally made of thin steel plate by stamping, bending and welding. The front edge, left edge and right edge of the fume hood have upwardly turned front flange, left flange and right flange, respectively. The positions where the front flange, left flange and right flange contact each other are fixed together by laser welding. For example, the Chinese invention patent with the patent number ZL201610369894.0 (the authorized announcement number CN106002035B) discloses a clamp for fume hood welding, which comprises a platform for placing the fume hood with flanges, and a positioning structure on the platform for positioning the fume hood. The platform is provided with outer pressure blocks and inner pressure blocks. The outer pressure blocks are driven by a driving structure to press the outer end surface of the flange of the fume hood away from the welding position. The inner pressure blocks are used to press the inner end surface of the flange of the fume hood adjacent to the welding position. The pressing positions of the inner pressure blocks correspond to the pressing positions of the outer pressure blocks.

[0003] The existing equipment for fume hood welding mainly has the following problems: (1) due to the particularity of the corner structure of the fume hood, the corner of the fume hood is prone to displacement due to unstable positioning, and is prone to inward indentation during positioning, which affects the quality of the finished fume hood; (2) the two sides of the weld on the back side of the fume hood are prone to unevenness, forming a step difference, which affects the welding quality; (3) it is only suitable for fume hoods of fixed size specifications, so different size specifications of fume hoods need to be designed with different equipment. SUMMARY

[0004] The first technical problem to be solved by the utility model is to provide a fume hood welding equipment with reliable positioning at the corner of the fume hood.

[0005] The second technical problem to be solved by the utility model is to provide a fume hood welding equipment with reliable positioning at the corner of the fume hood and avoiding inward indentation.

[0006] The third technical problem to be solved by the utility model is to provide a fume hood welding equipment with reliable positioning at the corner of the fume hood and good welding quality.

[0007] The fourth technical problem to be solved by the utility model is to provide a fume hood welding equipment with reliable positioning at the corner of the fume hood and applicable to fume hoods of various size specifications.

[0008] The utility model discloses a technology scheme that solves at least one of the above technical problems, which is a fume hood welding equipment characterized by comprising

[0009] A rack has a vertically extending workbench, and the front face of the workbench is a work face;

[0010] An inner support mechanism is arranged on the left and right sides of the work face respectively and includes an inner support block for hooking the corresponding corner of the upper end of the fume hood.

[0011] A side pressing mechanism is arranged on the left and right sides of the work face respectively, corresponds to the inner support mechanism one by one, and is arranged side by side with the corresponding inner support mechanism.

[0012] A lower pressing mechanism is arranged on the left and right sides of the work face respectively, corresponds to the inner support mechanism one by one, and is arranged above the corresponding inner support mechanism.

[0013] A pressing mechanism is arranged on the left and right sides of the workbench in the front-rear direction, corresponds to the inner support mechanism one by one, and is arranged behind the corresponding inner support mechanism.

[0014] In the working state, the fume hood is vertically placed on the work face of the workbench, each inner support block abuts against the inner side of the corresponding corner, and each side pressing block, each lower pressing block, and each pressing member abut against the outer side of the corresponding corner.

[0015] Further, the pressing member of each pressing mechanism is a rod, and the pressing member of each pressing mechanism is two rods arranged side by side and corresponds to the bending edge on both sides of the corresponding weld one by one.

[0016] Further, each of the inner support mechanisms further comprises a slide rail, a sliding block and a sliding cylinder for driving the sliding block, each of the slide rails is fixed on the working surface along the left-right direction, each of the inner support blocks is slidably connected on the corresponding slide rail, and each of the sliding blocks is fixed with the corresponding inner support block.

[0017] Further, each of the inner support mechanisms further comprises a first limiting component, each of the first limiting components comprises a first mounting block and a left-right extending limiting rod, wherein a left-right extending first threaded hole is formed on each of the first mounting blocks, each of the limiting rods extends left and right and is threadedly connected in the corresponding first threaded hole and is fixed with the corresponding first mounting block through a nut, and the length of the part of each of the limiting rods exposed outside the first mounting block is adjustable, and in the working state, the free end of each of the limiting rods abuts against the corresponding sliding block left and right. Thus, the positioning of each of the sliding blocks can be realized, and the positioning of each of the inner support blocks is further realized, so that each of the inner support blocks is stably positioned at the required position, and the reliability of the positioning of the fume hood is ensured.

[0018] Further, each of the inner support mechanisms further comprises a lower support block, each of the lower support blocks is fixed on the working surface below the corresponding slide rail, and each of the lower support blocks abuts against the corresponding inner support block up and down. Thus, each of the inner support blocks can be more stably slid along the corresponding slide rail left and right.

[0019] Further, an upper limiting mechanism is further included, the upper limiting mechanism comprises a left-right extending upper support block, the top of the upper support block is stepped with the front being higher and the rear being lower along the length direction of the upper support block, and the upper surface of the top of the upper support block is slidably provided with a left sliding block and a right sliding block facing each other along the left-right direction,

[0020] In the working state, the middle part of the upper end of the fume hood is hooked on the upper support block, and the left sliding block and the right sliding block are located in the left-right extending through hole of the upper end of the fume hood, and the left sliding block is positioned at the left end of the through hole, and the right sliding block is positioned at the right end of the through hole. Through the upper limiting mechanism, on the one hand, the fume hood can be more stably hooked on the working surface of the workbench during the loading stage of the fume hood, and on the other hand, the left-right limiting of the fume hood can be realized.

[0021] Further, upper surfaces of the upper supporting blocks are respectively provided with left sliding grooves for left sliding blocks and right sliding grooves for right sliding blocks, so that the left and right sliding blocks can slide leftward and rightward smoothly, and each sliding block is provided with a long hole extending leftward and rightward, and each sliding groove is provided with a fastening hole at a groove wall opposite to the corresponding long hole, and in the working state, each sliding block is connected with the fastening hole of the corresponding sliding groove through a first fastener penetrating the long hole, so that each sliding block can be locked at a required position firmly, and the reliability of the upper limiting mechanism for limiting the hood leftward and rightward is ensured.

[0022] Further, the lower limiting mechanism is arranged on the left and right sides of the working surface respectively, and each lower limiting mechanism comprises a second mounting block and a lower limiting block, and in the working state, each second mounting block is arranged on the left and right sides of the lower end of the hood,

[0023] Each second mounting block is provided with a vertical mounting groove, and the size of the mounting groove is matched with the size of the corresponding lower limiting block, and each lower limiting block is embedded in the corresponding mounting groove and can move up and down along the mounting groove,

[0024] and each lower limiting block is provided with a long strip-shaped lower mounting hole extending leftward and rightward vertically, and each mounting groove is provided with a second threaded hole on the groove wall, and each lower limiting block is fixed with the corresponding second mounting block through a second fastener penetrating the lower mounting hole and the corresponding second threaded hole. Thus, the lower limiting mechanism can support and limit the hood downward, and the position of each lower limiting block can be adjusted up and down according to the height of the hood, so that the utility model is suitable for hoods with different heights.

[0025] Further, the top of each lower limiting block is provided with a limiting protrusion, and in the working state, each limiting protrusion abuts against the front and back of the lower end of the hood. Thus, the lower end of the hood can be limited frontward and backward, and the lower end of the hood can be prevented from swinging frontward and backward.

[0026] Further, the rear limiting assembly comprises a left rear limiting block and a right rear limiting block fixed on the left and right sides of the working surface respectively, and in the working state, the left rear limiting block abuts against the front and back of the left rear folded edge of the hood, and the right rear limiting block abuts against the front and back of the right rear folded edge of the hood. Thus, the hood can be kept in the vertical state more stably, and the hood can be prevented from moving frontward and backward.

[0027] Compared with the prior art, the utility model discloses the advantages lie in: be provided with inner support mechanism, side pressure mechanism, lower pressure mechanism and pressure mechanism, wherein the shape of the corresponding end face of each inner support block of each inner support mechanism is matched with the inner surface of corresponding corner respectively, the shape of the corresponding end face of each side pressure block of each side pressure mechanism is matched with the outside of corresponding corner respectively, and the shape of the bottom of each lower pressure block of each lower pressure mechanism is matched with the outer top of corresponding corner respectively. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 It is the structure schematic diagram of the utility model embodiment of fume hood welding equipment (working state, fume hood right side is not clamped);

[0029] Figure 2 It is Figure 1 the enlarged view of part A in it;

[0030] Figure 3 It is the structure schematic diagram of the utility model embodiment of fume hood welding equipment in another state (non-working state);

[0031] Figure 4 It is Figure 3 the enlarged view of part B in it (clamping state);

[0032] Figure 5 It is Figure 3 the enlarged view of part C in it (unclamped state);

[0033] Figure 6 It is the structure exploded view of the first limiting component in the utility model embodiment;

[0034] Figure 7 It is the structure exploded view of the upper limiting mechanism in the utility model embodiment;

[0035] Figure 8 It is the structure exploded view of the lower limiting mechanism in the utility model embodiment;

[0036] Figure 9 It is the structure schematic diagram of fume hood in the utility model embodiment;

[0037] Figure 10 It is Figure 9 the structure schematic diagram in another direction. DETAILED DESCRIPTION

[0038] The utility model will be described in further detail below in conjunction with the drawings.

[0039] In the description of the utility model, it is understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, since the disclosed embodiments of the utility model can be arranged in different directions, so these orientation terms are only as an illustration and should not be regarded as a limitation, for example, "upper", "lower" are not necessarily limited to the direction opposite or consistent with the direction of gravity. In addition, the features defined as "first", "second" can explicitly or implicitly include one or more features.

[0040] As Figures 1-8As shown, a fume hood welding device comprises a frame 1, an inner supporting mechanism 2, a side pressing mechanism 3, a lower pressing mechanism 4 and a pressing mechanism 5. The frame 1 comprises a horizontally extending base 11 and a workbench 12 fixed on the top surface of the base 11 and extending vertically, the front surface of the workbench 12 is a work surface 120, and the back surface of the workbench 12 is fixed with triangular-shaped reinforcing plates 13 on the left and right sides, so that the internal structure of the frame 1 is more firm. The inner supporting mechanism 2 is arranged on the left and right sides of the work surface 120 respectively, and comprises an inner supporting block 21 for hooking the corresponding corner of the upper end of the fume hood 9, and the shape of the corresponding end surface of each inner supporting block 21 is matched with the inner surface of the corresponding corner. The side pressing mechanism 3 is arranged on the left and right sides of the work surface 120 respectively, corresponding to the inner supporting mechanism 2 and arranged side by side with the corresponding inner supporting mechanism 2, and comprises a side pressing block 31 and a side pressing cylinder 32 for driving the side pressing block 31 to move back and forth, and the shape of the corresponding end surface of each side pressing block 31 is matched with the outer side surface of the corresponding corner. The lower pressing mechanism 4 is arranged on the left and right sides of the work surface 120 respectively, corresponding to the inner supporting mechanism 2 and arranged above the corresponding inner supporting mechanism 2, and comprises a lower pressing block 41 and a lower pressing cylinder 42 for driving the lower pressing block 41 to move up and down, and the shape of the bottom surface of each lower pressing block 41 is matched with the outer top surface of the corresponding corner. The pressing mechanism 5 is arranged on the left and right sides of the workbench 12 in the front-rear direction, corresponding to the inner supporting mechanism 2 and arranged behind the corresponding inner supporting mechanism 2, and comprises a front-rear extending pressing member 51 and a pressing cylinder 52 for driving the pressing member 51 to move forward and backward. In the working state, the fume hood 9 is placed vertically on the work surface 120 of the workbench 12, each inner supporting block 21 abuts against the inner side of the corresponding corner, and each side pressing block 31, each lower pressing block 41 and each pressing member 51 abut against the outer side of the corresponding corner, wherein each pressing member 51 presses the back side welding position of the corresponding corner from back to front, so that the bending edges 92 on both sides of the welding seam are flush.

[0041] As can be seen, the fume hood welding equipment is provided with the inner supporting mechanism 2, the side pressing mechanism 3, the lower pressing mechanism 4 and the pressing mechanism 5, wherein the corresponding end surface of each inner supporting block 21 of each inner supporting mechanism 2 is matched with the inner surface of the corresponding corner, the corresponding end surface of each side pressing block 31 of each side pressing mechanism 3 is matched with the outer side surface of the corresponding corner, and the bottom surface of each lower pressing block 41 of each lower pressing mechanism 4 is matched with the outer top surface of the corresponding corner. In this way, in the working state, each inner supporting block 21 abuts against the inner side of the corresponding corner, and each side pressing block 31, each lower pressing block 41 and each pressing piece 51 abut against the outer side of the corresponding corner, so that reliable positioning of the corner of the fume hood 9 can be realized, and the corner inward collapse in the welding process can be effectively avoided. In addition, each pressing piece 51 is pressed against the back side welding position of the corresponding corner from back to front, so that the bending edges 92 on both sides of the welding seam are flush, thereby ensuring the laser welding quality. The structure of the fume hood 9 in the embodiment is shown in Figs. Figure 9 and Figure 10 .

[0042] In the embodiment, specifically, the pressing piece 51 of each pressing mechanism 5 is a rod, and the pressing piece 51 of each pressing mechanism 5 is two rod pieces arranged side by side and corresponding to the bending edges 92 on both sides of the corresponding welding seam. In the working state, each pressing piece 51 abuts against the corresponding bending edge 92 from front to back. Therefore, the bending edges 92 on both sides of the welding seam can be better ensured to be flush, thereby better ensuring the welding quality.

[0043] Further, each inner supporting mechanism 2 further comprises a sliding rail 22, a sliding block 23 and a sliding cylinder 24 for driving the sliding block 23. Each sliding rail 22 is fixed on the working surface 120 in the left-right direction, each inner supporting block 21 is slidingly connected to the corresponding sliding rail 22, and each sliding block 23 is fixed to the corresponding inner supporting block 21. In this way, the position of each inner supporting block 21 can be adjusted by moving each inner supporting block 21 along the corresponding sliding rail 22, so that the fume hood 9 with different left-right widths can be smoothly hooked on the inner supporting mechanisms 2 on both sides, thereby making the fume hood welding equipment of the utility model applicable to fume hoods 9 with various widths.

[0044] Preferably, each of the above-mentioned inner support mechanisms 2 further comprises a first limiting assembly 25, each of which comprises a first mounting block 251 and a left and right extending limiting rod 252. Among them, each first mounting block 251 is provided with a left and right extending first threaded hole 2510, each limiting rod 252 extends left and right and is screwed into the corresponding first threaded hole 2510 and is fixed to the corresponding first mounting block 251 by a nut 253, so that the length of each limiting rod 252 exposed outside the first mounting block 251 is adjustable, and in the working state, the free end of each limiting rod 252 is respectively abutted with the corresponding sliding block 23. Thus, the positioning of each sliding block 23 can be achieved, and then the positioning of each inner support block 21 is achieved, so that each inner support block 21 is stably positioned at the required position, ensuring the reliability of the positioning of the smoke hood 9. Further preferably, each of the above-mentioned inner support mechanisms 2 further comprises a lower support block 26, each of which is fixed on the above-mentioned working surface 120 below the corresponding sliding rail 22, and each lower support block 26 is abutted with the corresponding inner support block 21, so that each inner support block 21 can be more stably slid along the corresponding sliding rail 22 left and right.

[0045] Further, it further comprises an upper limiting mechanism 6, which comprises a left and right extending upper support block 61, the top of which is stepped in the length direction thereof with the front being higher and the rear being lower, and the upper surface of the top of the above-mentioned upper support block 61 is provided with a left sliding block 62 and a right sliding block 63 which are slidably arranged in the left and right direction. In the working state, the middle part of the upper end of the smoke hood 9 is hooked on the upper support block 61, and the left and right sliding blocks 62 and 63 are located in the left and right extending through hole 91 of the upper end of the smoke hood 9, and the left sliding block 62 is positioned at the left end of the through hole 91, and the right sliding block 63 is positioned at the right end of the through hole 91. Through the upper limiting mechanism 6, on the one hand, the smoke hood 9 can be more stably hooked on the working surface 120 of the workbench 12 during the loading stage of the smoke hood 9, and on the other hand, the left and right limiting of the smoke hood 9 can be achieved.

[0046] Further, the upper surface of the top of the above-mentioned upper support block 61 is respectively provided with a left sliding groove 611 for slidably installing the above-mentioned left sliding block 62 and a right sliding groove 612 for slidably installing the above-mentioned right sliding block 63, so that the left and right sliding of the left and right sliding blocks 62 and 63 can be smoothly achieved. And each sliding block is provided with a left and right extending long hole 64, and each sliding groove is provided with a fastening hole 65 at the groove wall opposite to the corresponding long hole 64. In the working state, each sliding block is connected with the fastening hole 65 of the corresponding sliding groove through the first fastener (not shown) inserted in the long hole 64 thereof, so that each sliding block can be firmly locked at the required position, ensuring the reliability of the left and right limiting of the smoke hood 9 by the upper limiting mechanism 6.

[0047] Further, the lower limiting mechanism 7 is arranged on the left and right sides of the working surface 120, and each lower limiting mechanism 7 comprises a second mounting block 71 and a lower limiting block 72. In the working state, each second mounting block 71 is in contact with the upper and lower sides of the left and right sides of the lower end of the smoke hood 9. Preferably, each second mounting block 71 is provided with a vertical mounting groove 711, and the size of the mounting groove 711 matches the size of the corresponding lower limiting block 72. Each lower limiting block 72 is embedded in the corresponding mounting groove 711 and can move up and down along the mounting groove 711. Each lower limiting block 72 is provided with a long strip-shaped lower mounting hole 721 extending vertically and penetrating left and right, and each mounting groove 711 is provided with a second threaded hole 712 on the groove wall. Each lower limiting block 72 is fixed to the corresponding second mounting block 71 by a second fastener (not shown) sequentially penetrating the lower mounting hole 721 and the corresponding second threaded hole 712. In this way, the lower limiting mechanism 7 can support and limit the lower end of the smoke hood 9. The position of each lower limiting block 72 can be adjusted up and down according to the height of the smoke hood 9, so that the utility model is suitable for smoke hoods 9 with different heights. Preferably, the top of each lower limiting block 72 is provided with a limiting protrusion 722. In the working state, each limiting protrusion 722 is in contact with the front and rear of the front surface of the lower end of the smoke hood 9, so as to limit the front and rear of the lower end of the smoke hood 9 and avoid the front and rear swing of the lower end of the smoke hood 9.

[0048] Further, the rear limiting assembly 8 comprises a left rear limiting block 81 and a right rear limiting block 82 fixed on the left and right sides of the working surface 120. In the working state, the left rear limiting block 81 is in contact with the front and rear of the left rear folding edge 93 of the smoke hood 9, and the right rear limiting block 82 is in contact with the front and rear of the right rear folding edge 93 of the smoke hood 9. In this way, the smoke hood 9 can be kept in a vertical state more stably, and the smoke hood 9 can be prevented from moving forward and backward. In the embodiment, the left rear limiting block 81 is two blocks arranged vertically and spaced apart, and the right rear limiting block 82 is also two blocks arranged vertically and spaced apart.

Claims

1. A fume hood welding apparatus, characterized by, Comprising a rack (1) having a vertically extending workbench (12), a front face of the workbench (12) being a work surface (120); an inner support mechanism (2) respectively arranged on left and right sides of the work surface (120) and respectively comprising an inner support block (21) for hooking a corresponding corner of an upper end of a fume hood (9), a corresponding end face of each inner support block (21) being shaped to match an inner surface of a corresponding corner; a side pressing mechanism (3) respectively arranged on left and right sides of the work surface (120) and corresponding to and arranged side by side with the inner support mechanism (2), and respectively comprising a side pressing block (31) and a side pressing cylinder (32) for driving the side pressing block (31) to move back and forth, and a corresponding end face of each side pressing block (31) being shaped to match an outer side of a corresponding corner; a lower pressing mechanism (4) respectively arranged on left and right sides of the work surface (120) and corresponding to and arranged above the inner support mechanism (2), and respectively comprising a lower pressing block (41) and a lower pressing cylinder (42) for driving the lower pressing block (41) to move up and down, and a bottom face of each lower pressing block (41) being shaped to match an outer top face of a corresponding corner; and a pressing mechanism (5) respectively arranged on left and right sides of the workbench (12) in a front-rear direction and corresponding to and arranged behind the inner support mechanism (2), and respectively comprising a front-rear extending pressing member (51) and a pressing cylinder (52) for driving the pressing member (51) to move back and forth; in a working state, the fume hood (9) is vertically placed on the work surface (120) of the workbench (12), each inner support block (21) abuts against an inner side of a corresponding corner, and each side pressing block (31), each lower pressing block (41) and each pressing member (51) abut against an outer side of a corresponding corner, wherein each pressing member (51) presses a back side of a corresponding corner from back to front to make a bending edge (92) on both sides of a weld flush.

2. The fume hood welding apparatus of claim 1, wherein, The pressing member (51) of each pressing mechanism (5) is a rod member, and the pressing member (51) of each pressing mechanism (5) is two rod members arranged side by side and corresponding to a bending edge (92) on both sides of a corresponding weld, and in the working state, each pressing member (51) abuts against a corresponding bending edge (92) from front to back.

3. The fume hood welding apparatus of claim 1, wherein, Each inner support mechanism (2) further comprises a sliding rail (22), a sliding block (23) and a sliding cylinder (24) for driving the sliding block (23), each sliding rail (22) is fixed on the work surface (120) in a left-right direction, each inner support block (21) is connected to a corresponding sliding rail (22) in a sliding fit, and each sliding block (23) is fixed to a corresponding inner support block (21).

4. The fume hood welding apparatus of claim 3, wherein, Each of the inner support mechanisms (2) further comprises a first limiting assembly (25), each of the first limiting assemblies (25) comprising a first mounting block (251) and a left-right extending limiting rod (252), wherein a left-right extending first threaded hole (2510) is formed in each of the first mounting blocks (251), each of the limiting rods (252) extending left and right and being threadedly connected in the corresponding first threaded hole (2510) and being fixed to the corresponding first mounting block (251) by a nut (253), so that the length of each of the limiting rods (252) exposed outside the first mounting block (251) is adjustable, and in the working state, the free end of each of the limiting rods (252) abuts against the corresponding sliding block (23) left and right.

5. The fume hood welding apparatus of claim 3, wherein, Each of the inner support mechanisms (2) further comprises a lower support block (26), each of the lower support blocks (26) being fixed on the working surface (120) below the corresponding sliding rail (22), and each of the lower support blocks (26) abutting against the corresponding inner support block (21) up and down.

6. The fume hood welding apparatus of any one of claims 1-5, wherein, Further comprising an upper limiting mechanism (6), the upper limiting mechanism (6) comprising a left-right extending upper support block (61), the top of the upper support block (61) being stepped with the top being higher in front and lower in back along the length direction thereof, and the upper surface of the top of the upper support block (61) being slidably provided with a left sliding block (62) and a right sliding block (63) facing each other in the left-right direction, In the working state, the middle part of the upper end of the smoke collecting hood (9) is hooked on the upper support block (61), and the left and right sliding blocks (62) and (63) are located in the left-right extending through hole (91) of the upper end of the smoke collecting hood (9), and the left sliding block (62) is positioned at the left end of the through hole (91), and the right sliding block (63) is positioned at the right end of the through hole (91).

7. The fume hood welding apparatus of claim 6, wherein, The upper surface of the top of the upper support block (61) is respectively provided with a left sliding groove (611) for slidably installing the left sliding block (62) and a right sliding groove (612) for slidably installing the right sliding block (63), and a left-right extending long hole (64) is formed in each of the sliding blocks, and a fastening hole (65) is formed in the groove wall opposite to the corresponding long hole (64) of each of the sliding grooves, and in the working state, each of the sliding blocks is connected with the fastening hole (65) of the corresponding sliding groove by a first fastener penetrating through the long hole (64) thereof.

8. The fume hood welding apparatus of any one of claims 1-5, wherein, Further comprising a lower limiting mechanism (7), the lower limiting mechanism (7) being provided on the left and right sides of the working surface (120), and each of the lower limiting mechanisms (7) comprising a second mounting block (71) and a lower limiting block (72), in the working state, each of the second mounting blocks (71) abutting against the left and right sides of the lower end of the smoke collecting hood (9) up and down, A vertical through mounting groove (711) is formed in each of the second mounting blocks (71), the size of the mounting groove (711) being matched with the size of the corresponding lower limiting block (72), and each of the lower limiting blocks (72) being embedded in the corresponding mounting groove (711) and being movable up and down along the mounting groove (711), And, each lower limit block (72) is respectively provided with a left-right through and vertically extending long strip-shaped lower mounting hole (721), and the slot wall of each mounting slot (711) is respectively provided with a second threaded hole (712), and each lower limit block (72) is fixed with the corresponding second mounting block (71) by sequentially threading the second fastener in the lower mounting hole (721) and the corresponding second threaded hole (712).

9. The fume hood welding apparatus of claim 8, wherein, The top of each lower limit block (72) is respectively provided with a limit protrusion (722), and in the working state, each limit protrusion (722) respectively abuts with the front and back of the lower end of the smoke hood (9).

10. The fume hood welding apparatus of any one of claims 1-5, wherein, It also includes a rear limiting assembly (8), which includes a left rear limiting block (81) and a right rear limiting block (82) fixed on the left and right sides of the above working surface (120), and in the working state, the left rear limiting block (81) abuts with the left rear folding edge (93) of the smoke hood (9), and the right rear limiting block (82) abuts with the right rear folding edge (93) of the smoke hood (9).

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