A lifting dust removal exhaust hood

Abstract

The present invention discloses a lifting dust removal exhaust hood, which relates to the technical field of laboratory supplies. It includes a fixing plate fixed to the indoor roof. A fixed pipe is fixedly provided at the bottom of the fixing plate. An air extraction pipe communicating with an external fan is provided on the side of the fixed pipe. A gas collection hood is provided at the bottom of the fixed pipe. It further includes a telescopic pipe installed inside the fixed pipe. The bottom end of the telescopic pipe is fixedly communicated with the top of the gas collection hood. A filter block for dust removal is fixedly provided inside the telescopic pipe. And an adjustment assembly installed on the outside of the fixed pipe to control the height of the telescopic pipe inside the fixed pipe. And an auxiliary assembly installed inside the telescopic pipe to clean the dust at the bottom of the filter block. The present invention adjusts the position of the telescopic pipe in the fixed pipe through the adjustment assembly, and then adjusts the height of the gas collection hood fixed to the telescopic pipe to meet the capture requirements of dust or waste gas during different experiments of the exhaust hood, prevent the escape of dust or waste gas, and improve the ventilation and exhaust effect during the experiment.

Description

Technical Field

[0001] The present invention relates to the technical field of laboratory supplies, and specifically relates to a lifting dust removal exhaust hood. Background Art

[0002] An exhaust hood is a commonly used exhaust device in a laboratory, mainly used to remove harmful gases and particles generated during experiments to protect the safety of experimental personnel and the cleanliness of the laboratory environment, and most of them are up-draft exhaust hoods.

[0003] Up-draft exhaust hoods are all fixedly installed directly above where dust, waste gas or moisture are generated. Their installation height can meet the requirements of operators and maintenance personnel for equipment maintenance and repair. Generally, they are fixedly installed at a relatively high position. However, dust, waste gas or moisture generated during experiments often easily form a diffusion-like upward movement instantaneously, making it difficult for the exhaust hood to capture them. And the dust or waste gas not captured by the exhaust hood in time will escape into the indoor space, endangering human health. For this reason, we propose a lifting dust removal exhaust hood. Summary of the Invention

[0004] The purpose of the present invention is to provide a lifting dust removal exhaust hood, and its advantage lies in adjusting the height of the air collection hood to adapt to the capture requirements of the exhaust hood for dust or waste gas in different experimental processes, preventing dust or waste gas from escaping outward, and improving the ventilation and exhaust effect during the experiment.

[0005] To achieve the above purpose, the present invention provides the following technical solution: A lifting dust removal exhaust hood includes a fixing plate fixed to the indoor roof. A fixed pipe is fixedly provided at the bottom of the fixing plate. An air extraction pipe communicating with an external fan is provided on the side of the fixed pipe. A collection hood is provided at the bottom of the fixed pipe. It further includes a telescopic pipe installed inside the fixed pipe. The bottom end of the telescopic pipe is fixedly communicated with the top of the collection hood. A filter block for dust removal is fixedly provided inside the telescopic pipe. And an adjustment component is installed on the outside of the fixed pipe to control the height of the telescopic pipe inside the fixed pipe. And an auxiliary component is installed inside the telescopic pipe to clean the dust accumulated at the bottom of the filter block.

[0006] Preferably, the adjustment component includes fixing blocks symmetrically provided on the front and rear sides of the telescopic pipe. The fixing blocks are fixed to the telescopic pipe. A sliding groove cooperating with the fixing blocks is provided on the side of the fixed pipe. Uniformly distributed limiting holes are provided on the outside of the fixing blocks. Two support rods are symmetrically provided on the outside of each fixing block. The support rods are fixed to the fixed pipe. A first pressing rod and a second pressing rod are respectively provided on the outside of the support rods symmetrically arranged on both sides of the fixing blocks. Slide holes for the support rods to slide are provided in the middle of the first pressing rod and the second pressing rod. An insertion rod is provided at the connection of the first pressing rod and the second pressing rod. The insertion rod is rotatably connected to both the first pressing rod and the second pressing rod at the same time. One end of the insertion rod is fitted into the limiting hole. A holding member is provided between the two first pressing rods and between the two second pressing rods. The holding member is provided on the side of the slide hole away from the insertion rod. A limiting component for controlling the height of the collection hood is provided on the outside of the fixed pipe.

[0007] Preferably, the holding member includes a holding cylinder. There are two holding cylinders, which are symmetrically arranged outside the fixed tube. The two holding cylinders are respectively arranged between two first pressure rods and two second pressure rods. Telescopic rods are slidably arranged at both ends of the holding cylinder. The outer ends of the telescopic rods are fixed to the first pressure rod or the second pressure rod, and the inner ends of the telescopic rods are slidably connected to the inner cavity arranged inside the holding cylinder. A slide plate is fixedly arranged at one end of the telescopic rod located inside the holding cylinder. The outer diameter of the slide plate is larger than the outer diameter of the telescopic rod connected thereto, so that when the slide plate slides in the inner cavity of the holding cylinder, it can be limited by its outer diameter to prevent the telescopic rod from detaching from the holding cylinder. A first compression spring is arranged on one side of the slide plate close to the telescopic rod. The first compression spring is sleeved on the telescopic rod and arranged inside the holding cylinder. Fixed rings are fixedly arranged at both ends of the first compression spring, and the fixed rings are rotatably arranged outside the telescopic rod.

[0008] Preferably, the limiting component includes a limiting plate. Sliding boxes are symmetrically arranged outside the bottom of the fixed tube. The sliding boxes are fixedly arranged outside the sliding grooves. The limiting plate is slidably arranged inside the sliding boxes. A second compression spring is fixedly arranged between the outer side of the limiting plate and the inner side of the sliding boxes. The bottom of the limiting plate extends out from the opening on the side wall of the fixed tube, and a limiting block is fixedly arranged on the inner side of the bottom of the limiting plate. Uniformly distributed limiting notches are arranged outside the fixed block, and the limiting block is fitted with the limiting notches.

[0009] Preferably, the auxiliary component includes two scraping plates. The two scraping plates are symmetrically arranged at the bottom of the filtering block. A first fixed rod is fixedly arranged on the side surface of the scraping plate. Symmetrically distributed first air cylinders are arranged outside the telescopic tube. The first air cylinders are fixed to the outside of the telescopic tube. One side of the first fixed rod away from the scraping plate penetrates through the outer wall of the telescopic tube and is fixedly provided with a first piston plate. The first piston plate is slidably arranged inside the first air cylinder. Symmetrically distributed mounting frames are fixedly arranged outside the telescopic tube. The mounting frames are arranged above the first air cylinders. A second air cylinder is rotatably arranged inside the mounting frame. A second piston plate is slidably arranged inside the second air cylinder. A second fixed rod is fixedly arranged on the side surface of the second piston plate. The outer end of the second fixed rod is fixed to the outside of the holding cylinder. An air outlet pipe is fixedly arranged outside the bottom of the second air cylinder. One end of the air outlet pipe away from the second air cylinder is fixed to one end of the first air cylinder away from the telescopic tube.

[0010] Preferably, the limiting holes and the limiting notches on the outside of the fixed block are distributed in a secondary manner.

[0011] Preferably, an auxiliary plate is fixedly arranged outside the inserting rod.

[0012] Preferably, the cross-section of the scraping plate is triangular.

[0013] Preferably, the upper side inside the limiting notch is horizontal and the lower side is an inclined opening.

[0014] Preferably, the limiting plate is a brass plate.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] 1. The present invention adjusts the position of the telescopic tube within the fixed tube through an adjustment component, thereby adjusting the height of the air collection hood fixed to the telescopic tube to meet the capture requirements of dust or waste gas by the exhaust hood during different experimental processes, preventing the escape of dust or waste gas, and improving the ventilation and exhaust effect during the experimental process.

[0017] 2. The present invention uses a holding cylinder sleeved on the first pressing rod and the second pressing rod. By pressing the first pressing rod and the second pressing rod with the holding cylinder, the insertion rod inserted into the limiting hole on the outer side of the telescopic tube is driven to move upward, thereby driving the telescopic tube and the air collection hood to move upward. At the same time, the limiting block on the limiting plate is driven by the second compression spring to be embedded in the limiting notch on the outer side of the telescopic tube to prevent the telescopic tube from moving downward under the action of gravity, thus adjusting the height of the air collection hood.

[0018] 3. The auxiliary component of the present invention adopts a pneumatic adjustment method. When adjusting the height of the air collection hood before the experiment, the pressure generated by the up and down movement of the holding cylinder drives the scraper to move on the filter block within the telescopic tube, scraping off the dust accumulated on the surface of the filter block to ensure smooth ventilation of the filter block during subsequent experiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 is a schematic diagram of the structure of the adjustment component of the present invention;

[0021] Figure 3 is a schematic diagram of the structure of the holding member of the present invention;

[0022] Figure 4 is a schematic diagram of the structure of the limiting component of the present invention;

[0023] Figure 5 is a schematic diagram of the structure of the limiting plate of the present invention;

[0024] Figure 6 is a schematic diagram of the structure of the auxiliary component of the present invention;

[0025] Figure 7 is a partial cross-sectional view schematic diagram of the auxiliary component of the present invention;

[0026] Figure 8 is a connection schematic diagram of the limiting block and the limiting notch of the present invention;

[0027] Figure 9 is a structure schematic diagram of the part of the scraper and the filter plate of the present invention.

[0028] In the figure: 1, fixed plate; 2, fixed pipe; 3, air extraction pipe; 4, air collection hood; 5, telescopic pipe; 6, filter block; 7, adjustment component; 8, auxiliary component; 9, fixed block; 10, sliding groove; 11, limiting hole; 12, support rod; 13, first pressing rod; 14, second pressing rod; 15, sliding hole; 16, inserting rod; 17, holding part; 18, limiting component; 19, holding cylinder; 20, first compression spring; 21, telescopic rod; 22, sliding plate; 23, fixing ring; 24, limiting plate; 25, sliding box; 26, second compression spring; 27, limiting block; 28, limiting notch; 29, scraping plate; 30, first fixing rod; 31, first air cylinder; 32, first piston plate; 33, mounting bracket; 34, second air cylinder; 35, second piston plate; 36, second fixing rod; 37, air outlet pipe; 38, auxiliary plate. Specific embodiments

[0029] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0030] Embodiment 1: Please refer to Figure 1 - Figure 9 , a lifting dust exhaust hood shown in the figure, including a fixed plate 1 fixed to the indoor roof, a fixed pipe 2 is fixedly arranged at the bottom of the fixed plate 1, an air extraction pipe 3 communicating with an external fan is arranged on the side of the fixed pipe 2, a air collection hood 4 is arranged at the bottom of the fixed pipe 2, and further includes a telescopic pipe 5 installed inside the fixed pipe 2, the bottom end of the telescopic pipe 5 is fixedly communicated with the top of the air collection hood 4, and a filter block 6 for dust removal is fixedly arranged inside the telescopic pipe 5; and an adjustment component 7 installed outside the fixed pipe 2 to control the height of the telescopic pipe 5 inside the fixed pipe 2; and an auxiliary component 8 installed inside the telescopic pipe 5 to clean the dust accumulated at the bottom of the filter block 6;

[0031] It should be noted that in this solution, the telescopic pipe 5 is slidably installed inside the bottom of the fixed pipe 2, and the air collection hood 4 is communicated at the bottom of the telescopic pipe 5 after accommodation, so that the dust or waste gas generated during the experiment can enter the telescopic pipe 5 from the air collection hood 4, pass through the filter block 6 inside the telescopic pipe 5 and enter the fixed pipe 2, and finally be discharged to the external pipeline through the air extraction pipe 3. Before the experiment starts, the height of the air collection hood 4 is adjusted through the adjustment component 7 to meet the capture requirements of the exhaust hood for dust or waste gas during the subsequent experiment, prevent the dust or waste gas from escaping outward, and improve the ventilation and exhaust effect during the experiment.

[0032] Specifically, refer to Figure 1 - Figure 6, the adjusting assembly 7 includes fixing blocks 9 symmetrically arranged on the front and rear sides of the telescopic tube 5. The fixing blocks 9 are fixed to the telescopic tube 5. A sliding groove 10 for cooperating with the fixing blocks 9 is provided on the side of the fixed tube 2. Uniformly distributed limiting holes 11 are provided on the outer sides of the fixing blocks 9. Two support rods 12 are symmetrically provided on the outer side of each fixing block 9. The support rods 12 are fixed to the fixed tube 2. A first pressing rod 13 and a second pressing rod 14 are respectively provided on the outer sides of the support rods 12 symmetrically arranged on both sides of the fixing block 9. Sliding holes 15 for the support rods 12 to slide are provided in the middle of the first pressing rod 13 and the second pressing rod 14. A plug rod 16 is provided at the connection of the first pressing rod 13 and the second pressing rod 14. The plug rod 16 is rotatably connected to both the first pressing rod 13 and the second pressing rod 14 at the same time. One end of the plug rod 16 is fitted into the limiting hole 11. An auxiliary plate 38 is fixedly provided on the outer side of the plug rod 16. A holding member 17 is provided between the two first pressing rods 13 and between the two second pressing rods 14. The holding member 17 is provided on the side of the sliding hole 15 away from the plug rod 16. A limiting assembly 18 for controlling the height of the air collecting hood 4 is provided on the outer side of the fixed tube 2;

[0033] Among them, the holding member 17 includes two holding cylinders 19. The two holding cylinders 19 are symmetrically arranged on the outer side of the fixed tube 2. The two holding cylinders 19 are respectively arranged between the two first pressing rods 13 and the two second pressing rods 14. Telescopic rods 21 are slidably provided at both ends of the holding cylinder 19. The outer ends of the telescopic rods 21 are fixed to the first pressing rod 13 or the second pressing rod 14. The inner ends of the telescopic rods 21 are slidably connected to the inner cavity provided inside the holding cylinder 19. A sliding plate 22 is fixedly provided at one end of the telescopic rod 21 located inside the holding cylinder 19. The outer diameter of the sliding plate 22 is larger than the outer diameter of the telescopic rod 21 connected thereto, so that when the sliding plate 22 slides in the inner cavity of the holding cylinder 19, it can be limited by its outer diameter to prevent the telescopic rod 21 from detaching from the holding cylinder 19. A first compression spring 20 is provided on the side of the sliding plate 22 close to the telescopic rod 21. The first compression spring 20 is sleeved on the telescopic rod 21. The first compression spring 20 is provided inside the holding cylinder 19. Fixed rings 23 are fixedly provided at both ends of the first compression spring 20. The fixed rings 23 are rotatably arranged on the outer side of the telescopic rod 21;

[0034] Furthermore, the limiting assembly 18 includes a limiting plate 24. Sliding boxes 25 are symmetrically provided on the outer side of the bottom of the fixed tube 2. The sliding boxes 25 are fixed on the outer side of the sliding groove 10. The limiting plate 24 is slidably arranged in the sliding box 25. A second compression spring 26 is fixedly provided between the outer side of the limiting plate 24 and the inner side of the sliding box 25. The bottom of the limiting plate 24 extends out from the opening on the side wall of the fixed tube 2, and a limiting block 27 is fixedly provided on the inner side of the bottom of the limiting plate 24. Uniformly distributed limiting notch openings 28 are provided on the outer side of the fixing block 9. The limiting block 27 is fitted into the limiting notch openings 28.

[0035] It should be noted that, as shown in Figure 2 、 Figure 4 and Figure 8 , the limiting holes 11 and the limiting notch openings 28 on the outer side of the fixing block 9 are distributed alternately. The upper side inside the limiting notch openings 28 is horizontal, and the lower side is an inclined opening.

[0036] Principle of the adjusting assembly 7 for adjusting the height of the air collecting hood 4: First, the operator pulls the first pressing rod 13 and the second pressing rod 14 outwards, takes out the inserting rod 16 from the limiting hole 11, and then moves the inserting rod 16 downwards to the limiting hole 11 at a position further below the outside of the fixed block 9. The operator releases the first pressing rod 13 and the second pressing rod 14. Under the action of the first compression spring 20, the elastic force of the first compression spring 20 drives the sliding plate 22 to move deeper into the holding cylinder 19, thereby driving the two telescopic rods 21 at both ends of the holding cylinder 19 to approach each other, driving the two first pressing rods 13 and the two second pressing rods 14 to approach each other, and thus inserting the inserting rod 16 into the limiting hole 11. At this time, the first pressing rod 13 and the second pressing rod 14 on the inserting rod 16 form a V shape. Then, the operator presses down the two holding cylinders 19. As the first pressing rod 13 and the second pressing rod 14 slide and rotate on the support rod 12 through the sliding holes 15, the telescopic tube 5 is driven to move upwards in the fixed tube 2 through the inserting rod 16. During the upward movement of the telescopic tube 5, the fixed block 9 squeezes the limiting block 27 and extrudes the limiting block 27 out of the limiting notch 28 on the outside of the fixed block 9. When the air collecting hood 4 moves to the appropriate height, the limiting block 27 is embedded in the limiting notch 28 exposed at the bottom of the fixed tube 2 along with the limiting plate 24 under the action of the second compression spring 26. At this time, the top of the limiting block 27 fits with the limiting notch 28 to prevent the telescopic tube 5 from falling under the action of gravity. At this time, the inserting rod 16 is inserted into the limiting hole 11 below the limiting block 27, and the auxiliary plate 38 on the outside of the inserting rod 16 abuts against the bottom of the limiting block 27, which can prevent the telescopic tube 5 from moving upwards under the action of an external force, thereby fixing the height of the air collecting hood 4.

[0037] Meanwhile, referring to Figure 1 、 Figure 6 、 Figure 7 and Figure 9 , the auxiliary assembly 8 includes two scraping plates 29. The two scraping plates 29 are symmetrically arranged at the bottom of the filtering block 6. A first fixing rod 30 is fixedly arranged on the side of the scraping plate 29. Symmetrically distributed first air cylinders 31 are arranged on the outside of the telescopic tube 5. The first air cylinders 31 are fixed to the outside of the telescopic tube 5. The side of the first fixing rod 30 away from the scraping plate 29 penetrates the outer wall of the telescopic tube 5 and is fixedly provided with a first piston plate 32. The first piston plate 32 slides inside the first air cylinder 31. Symmetrically distributed mounting brackets 33 are fixedly arranged on the outside of the telescopic tube 5. The mounting brackets 33 are arranged above the first air cylinders 31. A second air cylinder 34 is rotatably arranged inside the mounting brackets 33. A second piston plate 35 slides inside the second air cylinder 34. A second fixing rod 36 is fixedly arranged on the side of the second piston plate 35. The outer end of the second fixing rod 36 is fixed to the outside of the holding cylinder 19. An air outlet pipe 37 is fixedly arranged on the outside of the bottom of the second air cylinder 34. One end of the air outlet pipe 37 away from the second air cylinder 34 is fixed to one end of the first air cylinder 31 away from the telescopic tube 5;

[0038] Principle of the auxiliary component 8 for cleaning the dust at the bottom of the filter block 6: Before adjusting the air collection hood 4 to a suitable height through the holding cylinder 19, the operator needs to clean the dust at the bottom of the filter block 6. At this time, the operator moves the holding cylinder 19 up and down. The up and down movement of the holding cylinder 19 drives the piston plate 35 in the air cylinder 34 to reciprocate through the fixing rod 36, thereby gradually pressing the gas in the air cylinder 34 into the air outlet pipe 37 and the air cylinder 31, or gradually sucking the gas in the air cylinder 31 into the air outlet pipe 37 and the air cylinder 34. When the gas in the air cylinder 34 is gradually pressed into the air cylinder 31, the air pressure pushes the fixing rod 30 to slide into the telescopic pipe 5 through the piston plate 32, thereby pushing the two scraping plates 29 at the bottom of the filter block 6 closer to each other; when the gas in the air cylinder 31 gradually enters the air cylinder 34, the negative pressure in the air cylinder 31 drives the two scraping plates 29 to move away from each other through the piston plate and the fixing rod 30, so as to drive the scraping plates 29 to move through the air pressure to scrape off the dust accumulated at the bottom of the filter block 6, and the scraped dust can be collected and cleaned by a collection item such as a box placed at the bottom of the air collection hood 4 in advance.

[0039] In this solution, the limit block 27 is first embedded in the limit notch 28 to prevent the telescopic pipe 5 from accidentally falling under the action of gravity. By inserting the insertion rod 16 into the lower limit hole 11, and then pressing the holding cylinder 19, the first pressing rod 13 and the second pressing rod 14 slide on the support rod 12. The resultant force of the first pressing rod 13 and the second pressing rod 14 acting together at the insertion rod 16 drives the telescopic pipe 5 to move upward in the fixed pipe 2, thereby driving the air collection hood 4 to move upward. During the upward movement of the telescopic pipe 5, the fixed block 9 squeezes the limit block 27, pushing the limit block 27 out of the limit notch 28 on the outside of the fixed block 9. When the pressing of the holding cylinder 19 stops, the limit block 27 is embedded in the corresponding limit notch 28. Repeat this step until the air collection hood 4 is moved to a suitable height. Then, the limit block 27 is embedded in the limit notch 28 to prevent the telescopic pipe 5 from falling, and at the same time, the insertion rod 16 is inserted into the limit hole 11 below the limit block 27 to prevent the telescopic pipe 5 from accidentally rising under the action of an external force, thereby fixing the height of the air collection hood 4, which is convenient for the air collection hood 4 to suck the dust or waste gas generated during the experiment in all directions during the subsequent experiment process, preventing the dust or waste gas from escaping into the indoor space;

[0040] During the continuous pressing of the holding cylinder 19 by the operator, the holding cylinder 19 drives the piston plate two 35 to continuously move up and down in the air cylinder two 34 through the fixing rod two 36, thereby gradually pressing the gas in the air cylinder two 34 into the air outlet pipe 37 and the air cylinder one 31, or gradually sucking the gas in the air cylinder one 31 into the air outlet pipe 37 and the air cylinder two 34. When the gas in the air cylinder two 34 is gradually pressed into the air cylinder one 31, the air pressure pushes the fixing rod one 30 to slide into the telescopic tube 5 through the piston plate one 32, thereby pushing the two scraping plates 29 at the bottom of the filter block 6 closer to each other; when the gas in the air cylinder one 31 gradually enters the air cylinder two 34, the negative pressure in the air cylinder one 31 drives the two scraping plates 29 to move away from each other through the piston plate and the fixing rod one 30. Through the continuous approaching and separating of the two scraping plates 29, the dust accumulated on the bottom surface area of the filter block 6 is scraped off, ensuring that in the subsequent experimental process, the dust or waste gas entering the air collecting hood 4 can be smoothly filtered by the filter block 6, ensuring the smooth ventilation of the overall device.

[0041] It should be noted that by driving the movement of the scraping plate 29 through air pressure, the compressible performance of the gas can be utilized to provide a large redundancy for the up and down movement range of the holding cylinder 19, ensuring that the scraping plate 29 can move normally on the surface of the filter block 6 during the process of the holding cylinder 19 driving the telescopic tube 5 to rise.

[0042] It also should be noted that referring to Figure 1 , by symmetrically arranging the fixing blocks 9 on the center line on both sides of the telescopic tube 5, and at the same time vertically arranging the limiting holes 11 on the center line of the fixing blocks 9. Further, the resultant force direction of the pressing rod one 13 and the pressing rod two 14 acting on the insertion rod 16 inserted in the limiting hole 11 is vertically upward, flush with the center lines of the telescopic tube 5 and the fixed tube 2. Thus, it can be ensured that during the process of the pressing rod one 13 and the pressing rod two 14 driving the telescopic tube 5 to move upward through the insertion rod 16, the telescopic tube 5 moves coaxially with the fixed tube 2, ensuring the straight and stable movement track of the telescopic tube 5 and preventing the telescopic tube 5 from colliding with the fixed tube 2 at an oblique angle during movement, which affects the sealing performance between the telescopic tube 5 and the fixed tube 2.

[0043] This solution adopts manual control for the lifting of the air collecting hood 4, without the need for an external electric or pneumatic power source, which is green, environmentally friendly, and energy-saving.

[0044] Embodiment Two: Referring to Figure 6 , this embodiment further explains Embodiment One, and the difference lies in the optimization of the scraping plate 29.

[0045] Specifically, the cross-section of the scraping plate 29 is triangular;

[0046] In this solution, the triangular scraper 29 can make the scraper 29 move more smoothly on the surface of the filter block 6. At the same time, the inclined surface of the triangular scraper 29 scrapes the dust on the surface of the filter block 6 in a shear manner, with a higher dust scraping efficiency. At the same time, when the two scrapers 29 approach each other, their hypotenuse lines approach and contact each other, which can prevent the dust scraped off by the scraper 29 from being squeezed between the two scrapers 29.

[0047] Embodiment 3: This embodiment further illustrates other embodiments, and the difference lies in the optimization of the material of the limiting plate 24.

[0048] Specifically, the limiting plate 24 is a brass plate. Compared with stainless steel, the limiting plate 24 made of brass plate has higher flexibility and good bending resistance. During the process of the limiting block 27 continuously entering and exiting the limiting notch 28, the limiting plate 24 made of brass plate can still maintain its initial state.

[0049] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device.

[0050] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A lifting dust removal exhaust hood, comprising: A fixing plate (1) fixed to an indoor roof, a fixing pipe (2) fixedly provided at the bottom of the fixing plate (1), an exhaust pipe (3) connected to an external fan provided on the side of the fixing pipe (2), and an air collecting hood (4) provided at the bottom of the fixing pipe (2); It is characterized by further comprising: a telescopic tube (5) installed inside the fixed tube (2), the bottom end of the telescopic tube (5) being fixedly connected to the top of the gas collecting hood (4), and a filter block (6) for dust removal being fixedly provided inside the telescopic tube (5); and, an adjusting component (7) installed on the outside of the fixed tube (2), through which the height of the telescopic tube (5) inside the fixed tube (2) is controlled; the adjusting component (7) comprises fixing blocks (9) symmetrically arranged on the front and rear sides of the telescopic tube (5), the fixing blocks (9) being fixed to the telescopic tube (5), a sliding groove (10) cooperating with the fixing blocks (9) being arranged on the side of the fixed tube (2), and evenly distributed limiting holes (11) being arranged on the outside of the fixing blocks (9), two supporting rods (12) being symmetrically arranged on the outside of each fixing block (9), the supporting rods (12) being fixed to the fixed tube (2), and a pressure rod 1 (13) and a pressure rod 2 (14) being symmetrically arranged on the outside of the supporting rods (12) on both sides of the fixing block (9), respectively, and a middle portion of each pressure rod 1 (13) and the pressure rod 2 (14) being provided with a guide for the supporting rod (12) to slide. A sliding hole (15), an insertion rod (16) is provided at the connection between the first pressure rod (13) and the second pressure rod (14), the insertion rod (16) is rotatably connected to the first pressure rod (13) and the second pressure rod (14), one end of the insertion rod (16) is engaged with the limiting hole (11), and a holding piece (17) is provided between the two first pressure rods (13) and between the two second pressure rods (14), and the holding piece (17) is arranged on the sliding hole (15). 15) on a side away from the insertion rod (16), the holding member (17) comprises a holding tube (19), two holding tubes (19) are provided, the two holding tubes (19) are symmetrically arranged on the outside of the fixed tube (2), and the two holding tubes (19) are respectively arranged between the two first pressure rods (13) and the two second pressure rods (14); a limit assembly (18) for controlling the height of the gas collecting hood (4) is provided on the outside of the fixed tube (2); The limiting assembly (18) comprises a limiting plate (24), a sliding box (25) is symmetrically arranged on the outer side of the bottom of the fixed tube (2), the sliding box (25) is fixedly arranged on the outer side of the slide groove (10), the limiting plate (24) is slidably arranged in the sliding box (25), a compression spring (26) is fixedly arranged between the outer side of the limiting plate (24) and the inner side of the sliding box (25), the bottom of the limiting plate (24) protrudes from the opening of the side wall of the fixed tube (2), and a limiting block (27) is fixedly arranged on the inner side of the bottom of the limiting plate (24), the outer side of the fixed block (9) is provided with evenly distributed limiting notches (28), and the limiting block (27) is engaged with the limiting notches (28); the upper side of the inner side of the limiting notch (28) is horizontal, and the lower side is oblique; and, An auxiliary component (8) is installed inside the telescopic tube (5), and dust accumulated at the bottom of the filter block (6) is cleaned by the auxiliary component (8); the auxiliary component (8) comprises two scrapers (29), the two scrapers (29) are symmetrically arranged at the bottom of the filter block (6), a fixing rod (30) is fixedly arranged on the side of the scraper (29), a symmetrically distributed air cylinder (31) is arranged on the outside of the telescopic tube (5), the air cylinder (31) is fixed to the outside of the telescopic tube (5), the fixing rod (30) penetrates the outer wall of the telescopic tube (5) on the side away from the scraper (29) and is fixedly provided with a piston plate (32), and the piston plate (32) is slidably arranged on the outside of the telescopic tube (5). Inside the first gas cylinder (31), a symmetrically distributed mounting frame (33) is fixedly provided on the outer side of the telescopic tube (5), the mounting frame (33) is arranged above the first gas cylinder (31), a second gas cylinder (34) is rotatably provided inside the mounting frame (33), a second piston plate (35) is slidably provided inside the second gas cylinder (34), a second fixing rod (36) is fixedly provided on the side of the second piston plate (35), the outer end of the second fixing rod (36) is fixed to the outer side of the holding tube (19), an air outlet pipe (37) is fixedly provided on the outer side of the bottom of the second gas cylinder (34), and one end of the air outlet pipe (37) away from the second gas cylinder (34) is fixed to one end of the first gas cylinder (31) away from the telescopic tube (5).

2. The lifting dust removal exhaust hood according to claim 1, characterized in that: Telescopic rods (21) are slidably provided at both ends of the holding tube (19); the outer end of the telescopic rod (21) is fixed to the first pressure rod (13) or the second pressure rod (14); the inner end of the telescopic rod (21) is slidably connected to an inner cavity provided inside the holding tube (19); a slide plate (22) is fixedly provided at one end of the telescopic rod (21) located inside the holding tube (19); the outer diameter of the slide plate (22) is larger than the outer diameter of the telescopic rod (21) connected thereto, so that the slide plate (22) is slidably connected to the inner cavity provided inside the holding tube (19); When sliding in the inner cavity of the holding tube (19), the outer diameter of the holding tube (19) can be used to limit the position of the telescopic rod (21) so as to prevent the telescopic rod (21) from being separated from the holding tube (19). A compression spring (20) is provided on the side of the slide plate (22) close to the telescopic rod (21). The compression spring (20) is sleeved on the telescopic rod (21). The compression spring (20) is arranged inside the holding tube (19). Fixed rings (23) are fixed at both ends of the compression spring (20). The fixed ring (23) is rotatably arranged on the outside of the telescopic rod (21).

3. The lifting dust removal exhaust hood according to claim 2 is characterized in that: The limiting holes (11) and the limiting slots (28) on the outside of the fixing block (9) are distributed in sequence.

4. The lifting dust removal exhaust hood according to claim 1, characterized in that: An auxiliary plate (38) is fixedly provided on the outer side of the insertion rod (16).

5. The lifting dust removal exhaust hood according to claim 1, characterized in that: The scraper (29) has a triangular cross section.

6. The lifting dust removal exhaust hood according to claim 1, characterized in that: The limiting plate (24) is a brass plate.

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