WO2022041771A1

WO2022041771A1 - Workbench for welding robot machining and usage method therefor

Info

Publication number: WO2022041771A1
Application number: PCT/CN2021/087408
Authority: WO
Inventors: 李定国; 潘晓平
Original assignee: 南京涵曦月自动化科技有限公司
Priority date: 2020-08-28
Filing date: 2021-04-15
Publication date: 2022-03-03
Also published as: CN112247428A

Abstract

A workbench for welding robot machining and a usage method therefor, the workbench comprising a support platform (1), a sliding base (2) being slidably installed on an upper portion of the support platform (1), and a rotating mechanism (3) being provided on an upper portion of the sliding base (2); the rotating mechanism (3) comprises a rotating platform (301), a rotating motor (302), a rotating shaft (303), a driving bevel gear (304) and a driven bevel gear (305). An angle adjusting mechanism (4) is provided on an upper portion of the rotating platform (301), the angle adjusting mechanism (4) comprising a support plate (401), a workpiece platform (402), a connecting shaft (403), an air cylinder (404) and a shaft base (405). The workbench for welding robot machining can achieve the function of rotation, and a welding workpiece may be rotated in the horizontal direction, improving work efficiency. In addition, the present invention has the function of angle adjusting in the vertical direction, and can satisfy the requirement of welding robots for welding working angles, improving the welding effect, and reducing working time consumption. Furthermore, the present invention can treat welding fumes generated during welding, avoiding the effect of direct emission of the welding fumes on the body and health of workers, and the usage effect is better.

Description

A welding robot processing table and using method thereof

technical field

The invention relates to the field of workbenches, in particular to a workbench for welding robot processing, and more particularly to a workbench for welding robot processing and a method for using the same.

Background technique

Welding robot is an industrial robot for welding metal workpieces. It can be controlled by software programs to complete very precise welding work. During welding, the workpieces to be welded need to be fixed on the workbench, so it is necessary to use Welding robot processing table;

However, the existing welding robot processing table has certain shortcomings that need to be improved. First, it does not have a rotating function. During welding, the welding workpiece cannot be rotated horizontally, so that the workpiece needs to be taken out for a second time. The installation increases the tediousness of the work and reduces the work efficiency; secondly, it does not have the function of adjusting the angle in the vertical direction, and the simple horizontal sliding function cannot meet the angle requirements of the welding robot for the welding workpiece, which reduces the welding effect and further increases. In addition, it does not have the function of welding fume treatment, and welding fume will be generated during welding work, and if the welding fume is not treated, it will affect the health of the staff and the use effect is poor.

technical problem

The main purpose of the present invention is to provide a welding robot processing table, which can effectively solve the problem that the background technology does not have the rotation function. During welding, the welding workpiece cannot be rotated in the horizontal direction, so that the workpiece needs to be taken out for secondary installation. It increases the tediousness of the work and reduces the work efficiency; secondly, it does not have the function of adjusting the angle in the vertical direction, and the simple horizontal sliding function cannot meet the angle requirements of the welding robot for the welding workpiece, which reduces the welding effect and further increases the work. Time-consuming; in addition, it does not have the function of welding fume treatment, and welding fume will be generated during welding work. If the welding fume is not treated, it will affect the health of the staff and cause technical problems with poor use effect.

technical solutions

To achieve the above object, the technical scheme adopted in the present invention is:

A welding robot processing workbench includes a support table, a sliding seat is slidably installed on the upper part of the support table, a rotating mechanism is arranged on the upper part of the sliding seat, and the rotating mechanism includes a rotating table, a rotating motor, a rotating shaft, Drive bevel teeth and driven bevel teeth, the upper part of the rotary table is provided with an angle adjustment mechanism, the angle adjustment mechanism includes a support plate, a workpiece table, a connecting shaft, a cylinder and a shaft seat, the upper part of the rotary table and the support A welding fume purification mechanism is arranged between the plates, a first sliding block and a second sliding block are fixedly installed at the bottom of the sliding seat, the first sliding block is located at one side of the second sliding block, and the A moving motor is fixedly installed on one side of the interior, a fixing seat is fixedly installed inside the support table at one side of the moving motor, and a screw rod is movably connected to the inside of the support table through the fixing seat.

As a further solution of the present invention, the rotary table is rotatably connected to the upper middle position of the sliding seat through a rotating shaft, the rotating motor is fixedly installed on one side of the upper part of the sliding seat, and the driving bevel gear is fixedly installed at the output of the rotating motor. On the shaft, the driven bevel teeth are fixedly mounted on the outside of the rotary table.

As a further solution of the present invention, the driven bevel teeth revolve around the rotary table, and the driving bevel teeth are connected with the driven bevel teeth in a toothed connection.

As a further solution of the present invention, the number of the support plates is two, the workpiece table is movably connected between the two support plates through a connecting shaft, the air cylinder is fixedly installed on the upper part of the rotary table near the rear, the The axle seat is fixedly installed on the upper part of the workpiece table near the rear.

As a further solution of the present invention, a shaft rod is provided between the output shaft of the air cylinder and the shaft seat, and the top of the workpiece table is flush with the top of the support plate.

As a further solution of the present invention, the welding fume purification mechanism includes a purification box, a fan, an exhaust duct, a duct, a first column, a second column, a first collar, a second collar, a cross bar, a smoking hood, Fasten bolts, activated carbon packing and mesh cover, the purification box is fixedly installed on one side of the upper part of the rotary table, the fan is fixedly installed on the other side of the upper part of the rotary table, and the two ends of the exhaust pipe are respectively connected to the upper part of the rotary table. The air inlet of the fan is fixedly connected to the bottom of one side of the purification box, one end of the duct is fixedly installed at the top center position of the purification box, the first column is fixedly installed at the top front position of the support plate, and the second column is fixedly installed. It is fixedly installed at the top rear of the support plate, the first collar is sleeved on the outside of the first column, the second collar is sleeved on the outside of the second column, and the two ends of the crossbar are fixedly connected Between the first collar and the second collar, the fume hood is fixedly installed on one side of the crossbar, the fastening bolt is threadedly connected to the outside of the first collar, and the grille is fixedly installed on the purification box At the corner position of the inner bottom, the activated carbon filler is filled in the inner side of the purification box and is located on the outside of the grille.

As a further solution of the present invention, the other end of the conduit is fixedly connected to the smoking hood through a three-way pipe, and the fastening bolt penetrates the first collar and is pressed against the outside of the first upright column.

As a further solution of the present invention, the output shaft of the moving motor is fixedly connected with a screw rod, and the screw rod is threadedly connected with the first sliding block and the second sliding block.

A method of using a workbench for welding robot processing, the using method specifically comprises the following steps:

Step 1: Fix the workpiece to be welded on the upper part of the workpiece table with an external fixture, the moving motor works to drive the screw to rotate, and the screw drives the first slider and the second slider through the thread action between the first slider and the second slider. The second sliding block moves, thereby driving the sliding seat to slide on the upper part of the support table, and adjusting the position of the workpiece to be welded in the horizontal direction;

Step 2: Start the rotary motor to work, the output shaft of the rotary motor drives the driving bevel teeth to rotate, and the driving bevel teeth drive the driven bevel teeth to rotate through the meshing effect between the driving bevel teeth and the driven bevel teeth, thereby driving the rotary table to rotate on the sliding seat through the rotating shaft. Rotate the upper part of the , and adjust the working angle to be welded in the horizontal direction;

Step 3: Start the cylinder to work, the output rod of the cylinder is extended or shortened, so that the output rod of the cylinder drives the shaft seat to move, thereby driving the workpiece table to rotate between the two support plates through the connecting shaft, and vertically adjust the angle of the workpiece to be welded;

Step 4: When the welding robot is welding, the fan works, and the air is drawn into the interior of the purification box through the exhaust pipe, so that the flue gas generated during welding enters the interior of the duct through the hood, and enters the interior of the purification box through the duct. After passing through the activated carbon filler inside the purification box, it is drawn out by the fan to complete the purification of welding fume;

Step 5: Turn the two fastening bolts so that the fastening bolts are separated from the surface of the first column and the second column, and then slide the first collar and the second collar on the outside of the first column and the second column using the cross bar , so that the height of the smoking hood changes, after adjusting to the appropriate height, turn the two fastening bolts again, so that the fastening bolts are pressed against the outside of the first and second uprights, and the first collar and the second The position of the second ring is fixed.

beneficial effect

By setting the rotating mechanism, the rotating motor is started to work, the output shaft of the rotating motor drives the driving bevel teeth to rotate, and the driving bevel teeth drive the driven bevel teeth to rotate through the meshing effect with the driven bevel teeth, thereby driving the rotary table to rotate through the rotating shaft. The upper part of the slide is rotated, and the working angle to be welded can be adjusted in the horizontal direction, which can realize the function of rotation. During welding, the welding workpiece can be rotated in the horizontal direction, and there is no need to take out the workpiece for secondary installation, which reduces the tediousness of the work and improves the work efficiency. ;

By setting the angle adjustment mechanism, the cylinder is started to work, and the output rod of the cylinder is extended or shortened, so that the output rod of the cylinder drives the shaft seat to move, thereby driving the workpiece table to rotate between the two support plates through the connecting shaft, and vertically adjusts the workpiece to be welded. It has the function of adjusting the angle in the vertical direction, which can meet the requirements of the welding robot for the welding work angle, improve the welding effect and reduce the working time;

By setting the welding fume purification mechanism, the fan works, and the air is drawn into the interior of the purification box through the exhaust pipe, so that the flue gas generated during welding enters the interior of the duct through the smoking hood, enters the interior of the purification box through the duct, and passes through the purification box. The internal activated carbon filler is drawn out by the fan to complete the purification of welding fume, which can deal with the welding fume generated during welding, and avoid the direct emission of welding fume to have an impact on the health of the staff. The use effect is better, and it has The height adjustment function can facilitate people to adjust the height of the smoking hood according to the height of the workpiece, and the scope of application is wider.

Description of drawings

1 is a schematic diagram of the overall structure of a welding robot processing workbench according to the present invention;

2 is a bottom view of a workpiece table and a support plate of a welding robot processing table according to the present invention;

3 is a schematic diagram of the internal structure of a support table of a welding robot processing table according to the present invention;

4 is a top view of a workpiece table and a support plate of a welding robot processing table according to the present invention;

5 is an enlarged view of A in FIG. 2 of a workbench for welding robot processing according to the present invention;

6 is a schematic diagram of the internal structure of a purification box of a workbench for welding robot processing according to the present invention.

In the figure: 1. support table; 2. sliding seat; 3. rotating mechanism; 301, rotating table; 302, rotating motor; 303, rotating shaft; 304, driving bevel teeth; 305, driven bevel teeth; ;401, support plate; 402, workpiece table; 403, connecting shaft; 404, cylinder; 405, shaft seat; 5, welding fume purification mechanism; 501, purification box; 502, fan; 503, exhaust pipe; 504, conduit 505, the first column; 506, the second column; 507, the first collar; 508, the second collar; 509, the cross bar; 5010, the hood; 5011, the fastening bolt; Net cover; 6. The first slider; 7. The second slider; 8. The moving motor; 9. The fixed seat; 10. The screw.

Embodiments of the present invention

In order to make the technical means, creative features, achievement goals and effects realized by the present invention easy to understand, the present invention will be further described below with reference to the specific embodiments.

As shown in Figures 1-6, a welding robot processing table includes a support table 1, a sliding seat 2 is slidably installed on the upper part of the support table 1, and a rotating mechanism 3 is provided on the upper part of the sliding seat 2, and the rotating mechanism 3 includes a The rotary table 301, the rotary motor 302, the rotating shaft 303, the driving bevel teeth 304 and the driven bevel teeth 305, the upper part of the rotary table 301 is provided with an angle adjustment mechanism 4, and the angle adjustment mechanism 4 includes a support plate 401, a workpiece table 402, a connecting shaft 403, the cylinder 404 and the shaft seat 405, the welding fume purification mechanism 5 is arranged between the upper part of the rotary table 301 and the support plate 401, the bottom of the sliding seat 2 is fixedly installed with the first sliding block 6 and the second sliding block 7, the first The sliding block 6 is located on one side of the second sliding block 7 , a moving motor 8 is fixedly installed on one side of the inner side of the support table 1 , and a fixed seat 9 is fixedly installed inside the supporting table 1 on one side of the moving motor 8 . The inside of the table 1 is movably connected with a screw rod 10 through a fixed seat 9;

The rotary table 301 is rotatably connected to the upper middle position of the sliding seat 2 through the rotating shaft 303, the rotary motor 302 is fixedly installed on the upper side of the sliding seat 2, the driving bevel gear 304 is fixedly installed on the output shaft of the rotary motor 302, and the driven cone The teeth 305 are fixedly installed on the outside of the rotary table 301; the driven bevel teeth 305 surround the rotary table 301, and the driving bevel teeth 304 are connected with the driven bevel teeth 305; the number of support plates 401 is two, and the workpiece table 402 is connected by The shaft 403 is movably connected between the two support plates 401, the cylinder 404 is fixedly installed on the upper part of the rotary table 301 near the rear, and the shaft seat 405 is fixedly installed on the upper part of the workpiece table 402 near the rear; the output shaft of the air cylinder 404 and the shaft seat A shaft is arranged between 405, and the top of the workpiece table 402 is flush with the top of the support plate 401; Two uprights 506, first collar 507, second collar 508, cross bar 509, smoke cover 5010, fastening bolts 5011, activated carbon packing 5012 and net cover 5013, the purification box 501 is fixedly installed on the upper side of the rotary table 301 Position, the fan 502 is fixedly installed on the other side of the upper part of the rotary table 301, the two ends of the exhaust pipe 503 are fixedly connected to the air inlet of the fan 502 and the bottom of one side of the purification box 501 respectively, and one end of the duct 504 is fixedly installed in the purification box 501. The top of the box 501 is in the center position, the first column 505 is fixedly installed at the top front position of the support plate 401, the second column 506 is fixedly installed at the top rear position of the support plate 401, and the first collar 507 is sleeved on the first column Outside the 505, the second collar 508 is sleeved on the outside of the second column 506, the two ends of the cross bar 509 are fixedly connected between the first collar 507 and the second collar 508, and the smoking cover 5010 is fixedly installed on the cross bar. On one side of 509, the fastening bolts 5011 are threadedly connected to the outside of the first collar 507, the mesh cover 5013 is fixedly installed at the inner bottom corner of the purification box 501, and the activated carbon filler 5012 is filled in the interior of the purification box 501. Outside; the other end of the conduit 504 is fixedly connected to the smoking hood 5010 through a three-way pipe, and the fastening bolt 5011 penetrates the first collar 507 and is pressed against the outside of the first column 505; the output shaft of the mobile motor 8 is fixedly connected to the screw rod 10 , the screw rod 10 is connected with the first sliding block 6 and the second sliding block 7 by thread.

A method of using a workbench for welding robot processing, the using method specifically includes the following steps:

Step 1: Fix the workpiece to be welded on the upper part of the workpiece table 402 with an external fixture, and the moving motor 8 works to drive the screw rod 10 to rotate, and the screw rod 10 acts through the thread between the first slider 6 and the second slider 7 Drive the first sliding block 6 and the second sliding block 7 to move, thereby driving the sliding seat 2 to slide on the upper part of the support table 1, and adjust the position of the workpiece to be welded in the horizontal direction;

Step 2: Start the rotating motor 302 to work, the output shaft of the rotating motor 302 drives the driving bevel teeth 304 to rotate, and the driving bevel teeth 304 drive the driven bevel teeth 305 to rotate through the meshing effect with the driven bevel teeth 305, thereby driving the rotation The table 301 rotates on the upper part of the sliding seat 2 through the rotating shaft 303, and the working angle to be welded is adjusted in the horizontal direction;

Step 3: Start the air cylinder 404 to work, the output rod of the air cylinder 404 is extended or shortened, so that the output rod of the air cylinder 404 drives the shaft seat 405 to move, thereby driving the workpiece table 402 to rotate between the two support plates 401 through the connecting shaft 403, and the vertical direction Adjust the angle of the workpiece to be welded;

Step 4: When the welding robot is welding, the fan 502 is working, and the air is drawn into the purification box 501 through the exhaust duct 503, so that the smoke generated during welding enters the interior of the duct 504 through the hood 5010, and enters the duct 504 through the duct 504. The inside of the purification box 501 is drawn out by the fan 502 after passing through the activated carbon filler 5012 inside the purification box 501 to complete the purification of welding fume;

Step 5: Rotate the two fastening bolts 5011 so that the fastening bolts 5011 are separated from the outer surface of the first column 505 and the second column 506, and then the first collar 507 and the second collar 508 are connected to the first column by the cross bar 509. 505 and the outside of the second column 506 slide, so that the height of the smoking hood 5010 changes, after adjusting to a suitable height, turn the two fastening bolts 5011 again, so that the fastening bolts 5011 abut against the first column 505 and the second The positions of the first collar 507 and the second collar 508 can be fixed on the outside of the upright post 506 .

In the present invention, by setting the rotating mechanism 3, the rotating motor 302 is started to work, the output shaft of the rotating motor 302 drives the driving bevel teeth 304 to rotate, and the driving bevel teeth 304 drive the driven bevel teeth 305 through the meshing effect with the driven bevel teeth 305. Rotating, thereby driving the rotary table 301 to rotate on the upper part of the sliding seat 2 through the rotating shaft 303, and adjusting the working angle to be welded in the horizontal direction, which can realize the function of rotation. During welding, the welding workpiece can be rotated in the horizontal direction without taking out the workpiece for secondary The installation reduces the tediousness of the work and improves the work efficiency; by setting the angle adjustment mechanism 4, the cylinder 404 is activated to work, and the output rod of the cylinder 404 is extended or shortened, so that the output rod of the cylinder 404 drives the shaft seat 405 to move, thereby driving the workpiece table. 402 rotates between the two support plates 401 through the connecting shaft 403, adjusts the angle of the workpiece to be welded in the vertical direction, and has the function of adjusting the angle in the vertical direction, which can meet the requirements of the welding robot for the welding work angle, improve the welding effect, and reduce work time. By setting the welding fume purification mechanism 5, the fan 502 works, and the air is drawn to the interior of the purification box 501 through the exhaust duct 503, so that the smoke generated during welding enters the interior of the duct 504 through the smoking hood 5010, and enters the purification through the duct 504. The inside of the box 501 passes through the activated carbon filler 5012 inside the purification box 501 and is drawn out by the fan 502 to complete the purification of the welding fume, which can deal with the welding fume generated during welding, and avoid the direct discharge of the welding fume to cause physical harm to the staff. The impact on health, the use effect is better, and it has a height adjustment function, which can facilitate people to adjust the height of the smoking hood 5010 according to the height of the workpiece, and the scope of application is wider.

The basic principles and main features of the present invention and the advantages of the present invention have been shown and described above. Those skilled in the art should understand that the present invention is not limited by the above-mentioned embodiments, and the descriptions in the above-mentioned embodiments and the description are only to illustrate the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have Various changes and modifications fall within the scope of the claimed invention. The claimed scope of the present invention is defined by the appended claims and their equivalents.

Claims

A welding robot processing workbench is characterized by comprising a support table (1), a sliding seat (2) is slidably installed on the upper part of the support table (1), and a rotating seat (2) is installed on the upper part of the sliding seat (2). Mechanism (3), the rotating mechanism (3) includes a rotating table (301), a rotating motor (302), a rotating shaft (303), a driving bevel tooth (304) and a driven bevel tooth (305), the rotating table The upper part of (301) is provided with an angle adjustment mechanism (4), and the angle adjustment mechanism (4) includes a support plate (401), a workpiece table (402), a connecting shaft (403), a cylinder (404) and a shaft seat (401). 405), a welding fume purification mechanism (5) is arranged between the upper part of the rotary table (301) and the support plate (401), and the bottom of the sliding seat (2) is fixedly installed with a first sliding block (6) and A second sliding block (7), the first sliding block (6) is located at one side of the second sliding block (7), and a moving motor (8) is fixedly installed on one side of the inner side of the support table (1). , a fixing seat (9) is fixedly installed inside the support table (1) at one side of the moving motor (8), and the inside of the support table (1) is movably connected with a lead screw ( 10).
A welding robot processing workbench according to claim 1, characterized in that: the rotary table (301) is rotatably connected to the upper middle position of the sliding seat (2) through a rotary shaft (303), and the rotary motor ( 302) is fixedly installed on the upper side of the sliding seat (2), the driving bevel teeth (304) are fixedly installed on the output shaft of the rotary motor (302), and the driven bevel teeth (305) are fixedly installed on the rotating motor (302). The exterior of the desk (301).
A welding robot processing workbench according to claim 2, characterized in that: the driven bevel teeth (305) surround the rotary table (301) once, and the driving bevel teeth (304) are connected to the driven bevel teeth (305) Toothed connection.
The welding robot processing worktable according to claim 1, characterized in that: the number of the support plates (401) is two, and the workpiece table (402) is movably connected to the two through a connecting shaft (403). Between the supporting plates (401), the cylinder (404) is fixedly installed on the upper part of the rotary table (301) near the rear, and the shaft seat (405) is fixedly installed on the upper part of the workpiece table (402) near the rear.
A welding robot processing workbench according to claim 1, characterized in that: a shaft rod is provided between the output shaft of the air cylinder (404) and the shaft seat (405), and the workpiece table (402) is provided with a shaft rod. The top is flush with the top of the support plate (401).
A welding robot processing workbench according to claim 1, characterized in that: the welding fume purification mechanism (5) comprises a purification box (501), a fan (502), an air extraction pipe (503), a duct (504), the first column (505), the second column (506), the first collar (507), the second collar (508), the cross bar (509), the smoke cover (5010), the fastening bolts ( 5011), activated carbon packing (5012) and net cover (5013), the purification box (501) is fixedly installed on the upper side of the rotary table (301), and the fan (502) is fixedly installed on the rotary table (301) On the other side of the upper part of the duct (503), the two ends of the exhaust pipe (503) are respectively fixedly connected to the air inlet of the fan (502) and the bottom of one side of the purification box (501), and one end of the duct (504) is fixedly installed At the top center position of the purification box (501), the first column (505) is fixedly installed at the top front position of the support plate (401), and the second column (506) is fixedly installed on the support plate (401). At the rear of the top, the first collar (507) is sleeved on the outside of the first column (505), the second collar (508) is sleeved on the outside of the second column (506), and the horizontal Both ends of the rod (509) are fixedly connected between the first collar (507) and the second collar (508). The fixing bolt (5011) is screwed on the outside of the first collar (507), the mesh cover (5013) is fixedly installed at the inner bottom corner of the purification box (501), and the activated carbon filler (5012) is filled in the purification box The inside of (501) is on the outside of the grille (5013).
A welding robot processing workbench according to claim 6, characterized in that: the other end of the conduit (504) is fixedly connected to the smoking hood (5010) through a three-way pipe, and the fastening bolt (5011) The penetrating first collar (507) abuts against the outside of the first upright post (505).
A welding robot processing workbench according to claim 1, characterized in that: the output shaft of the moving motor (8) is fixedly connected to the lead screw (10), and the lead screw (10) is connected to the first slide screw (10). The block (6) and the second sliding block (7) are screwed together.
A method of using the welding robot processing workbench according to claim 1, wherein the using method specifically comprises the following steps:

Step 1: Fix the workpiece to be welded on the upper part of the workpiece table (402) with an external fixture, and the moving motor (8) works to drive the lead screw (10) to rotate, and the lead screw (10) passes through the first slider (6) and The thread action between the second sliding blocks (7) drives the first sliding block (6) and the second sliding block (7) to move, thereby driving the sliding seat (2) to slide on the upper part of the support table (1), and adjust the horizontal direction. The position of the workpiece to be welded;

Step 2: Start the rotary motor (302) to work, the output shaft of the rotary motor (302) drives the driving bevel teeth (304) to rotate, and the driving bevel teeth (304) are driven by the meshing effect with the driven bevel teeth (305). The driven bevel tooth (305) rotates, thereby driving the rotary table (301) to rotate on the upper part of the sliding seat (2) through the rotating shaft (303), and the working angle to be welded is adjusted horizontally;

Step 3: Start the air cylinder (404) to work, the output rod of the air cylinder (404) is extended or shortened, so that the output rod of the air cylinder (404) drives the shaft seat (405) to move, thereby driving the workpiece table (402) through the connecting shaft (403) Rotate between the two support plates (401) to adjust the angle of the workpiece to be welded vertically;

Step 4: When the welding robot is welding, the fan (502) works, and the air is drawn into the purification box (501) through the exhaust duct (503), so that the flue gas generated during welding enters the duct (5010) through the hood (5010). 504) enters the interior of the purification box (501) through the conduit (504), passes through the activated carbon filler (5012) inside the purification box (501), and is drawn out by the fan (502) to complete the purification of welding fume;

Step 5: Turn the two tightening bolts (5011) so that the tightening bolts (5011) are separated from the outer surfaces of the first column (505) and the second column (506), and then remove the first ring (507) and the second The ring (508) slides on the outside of the first upright (505) and the second upright (506) by using the cross bar (509), so that the height of the smoking hood (5010) changes, and after adjusting to a suitable height, turn the two again Fasten the bolts (5011) so that the fastening bolts (5011) abut against the outside of the first column (505) and the second column (506), then the first collar (507) and the second collar (508) ) is fixed.