Lifting type dust removal exhaust hood

Abstract

The invention discloses a lifting type dust removal exhaust hood, which relates to the technical field of laboratory supplies, and comprises a fixed plate fixed on an indoor roof, a fixed pipe fixedly arranged at the bottom of the fixed plate, an exhaust pipe communicated with an external fan arranged on the side surface of the fixed pipe, a gas collecting hood arranged at the bottom of the fixed pipe, and a telescopic pipe arranged in the fixed pipe, the bottom end of the telescopic pipe fixedly communicates with the top of the gas collecting hood, and a filter block for dust removal is fixedly arranged in the telescopic pipe; the adjusting assembly is installed on the outer side of the fixed pipe, and the height of the telescopic pipe in the fixed pipe is controlled through the adjusting assembly; according to the device, the position of the telescopic pipe in the fixed pipe is adjusted through the adjusting assembly, and then the height of the gas collecting hood fixed to the telescopic pipe is adjusted, so that the requirement for capturing dust or waste gas of the exhaust hood in different experiment processes is met; dust or waste gas is prevented from escaping outwards, and the ventilation and exhaust effects in the experiment process are improved.

Description

Technical Field

[0001] The invention relates to the technical field of laboratory supplies, in particular to a lifting type dust removal exhaust hood. Background Art

[0002] The exhaust hood is a commonly used exhaust equipment in laboratories. It is mainly used to remove harmful gases and particles generated during the experiment to protect the safety of experimenters and the cleanliness of the laboratory environment. Most of them are top-extraction exhaust hoods.

[0003] Upper exhaust hoods are fixedly installed just above where dust, waste gas or moisture is generated. Their installation height can meet the needs of operators and maintenance personnel for equipment maintenance and repair. They are generally fixed at a higher height. However, the dust, waste gas or moisture generated during the experiment often easily diffuses and rises instantly, making it difficult for the exhaust hood to capture them. Dust or waste gas that is not captured in time by the exhaust hood will escape into the indoor space and endanger 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, which has the advantage of adjusting the height of the hood to adapt to the exhaust hood's needs for capturing dust or waste gas in different experimental processes, preventing dust or waste gas from escaping to the outside, and improving the ventilation and exhaust effect during the experiment.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a lifting dust removal exhaust hood, comprising a fixed plate fixed to an indoor roof, a fixed pipe fixedly provided at the bottom of the fixed plate, an exhaust pipe connected to an external fan provided on the side of the fixed pipe, an air collecting hood provided at the bottom of the fixed pipe, and also comprising a telescopic pipe installed inside the fixed pipe, the bottom end of the telescopic pipe is fixedly connected to the top of the air collecting hood, a filter block for dust removal is fixed inside the telescopic pipe; and an adjusting component installed on the outside of the fixed pipe, the height of the telescopic pipe inside the fixed pipe is controlled by the adjusting component; and an auxiliary component installed inside the telescopic pipe, the dust accumulated at the bottom of the filter block is cleaned by the auxiliary component.

[0006] Preferably, the adjustment component includes fixed blocks symmetrically arranged on the front and rear sides of the telescopic tube, the fixed block is fixed to the telescopic tube, a sliding groove cooperating with the fixed block is arranged on the side of the fixed tube, and evenly distributed limiting holes are arranged on the outer side of the fixed block, and two support rods are symmetrically arranged on the outer side of each fixed block, and the support rods are fixed to the fixed tube, and pressure rods 1 and 2 are respectively arranged on the outer sides of the support rods symmetrically arranged on both sides of the fixed block, and sliding holes for sliding support rods are arranged in the middle of pressure rods 1 and 2, and an insertion rod is arranged at the connection between pressure rods 1 and 2, and the insertion rod is rotatably connected to pressure rods 1 and 2 at the same time, and one end of the insertion rod is engaged with the limiting hole, and a holding piece is arranged between the two pressure rods 1 and the two pressure rods 2, and the holding piece is arranged on the side of the sliding hole away from the insertion rod, and a limiting assembly for controlling the height of the air collecting hood is provided on the outer side of the fixed tube.

[0007] Preferably, the holding member includes a holding tube, which is provided with two holding tubes, which are symmetrically arranged on the outside of the fixed tube, and the two holding tubes are respectively arranged between the two pressure rods 1 and the two pressure rods 2. Telescopic rods are slidably provided at both ends of the holding tube, the outer end of the telescopic rod is fixed to the pressure rod 1 or the pressure rod 2, and the inner end of the telescopic rod is slidably connected to an inner cavity set inside the holding tube, and a slide is fixedly provided at one end of the telescopic rod located inside the holding tube, and the outer diameter of the slide is larger than the outer diameter of the telescopic rod connected thereto, so that the slide can be limited by its outer diameter when sliding in the inner cavity of the holding tube to prevent the telescopic rod from detaching from the holding tube, and a compression spring 1 is provided on the side of the slide close to the telescopic rod, and the compression spring is set on the telescopic rod, and the compression spring 1 is arranged inside the holding tube, and fixing rings are fixedly provided at both ends of the compression spring 1, and the fixing rings are rotatably arranged on the outside of the telescopic rod.

[0008] Preferably, the limit assembly includes a limit plate, a sliding box is symmetrically provided on the outer side of the bottom of the fixed tube, the sliding box is fixed on the outer side of the slide groove, the limit plate is slidably provided in the sliding box, two compression springs are fixed between the outer side of the limit plate and the inner side of the sliding box, the bottom of the limit plate extends out from the opening of the side wall of the fixed tube, and a limit block is fixed on the inner side of the bottom of the limit plate, and evenly distributed limit grooves are provided on the outer side of the fixed block, and the limit block is engaged with the limit groove.

[0009] Preferably, the auxiliary component includes two scrapers, which are symmetrically arranged at the bottom of the filter block, a fixing rod 1 is fixedly provided on the side of the scraper, a symmetrically distributed air cylinder 1 is provided on the outer side of the telescopic tube, the air cylinder 1 is fixed to the outer side of the telescopic tube, a fixing rod 1 extends through the outer wall of the telescopic tube away from the scraper and is fixedly provided with a piston plate 1, the piston plate 1 is slidably arranged inside the air cylinder 1, a symmetrically distributed mounting frame is fixedly provided on the outer side of the telescopic tube, the mounting frame is arranged above the air cylinder 1, an air cylinder 2 is rotatably provided in the mounting frame, a piston plate 2 is slidably provided in the air cylinder 1, a fixing rod 2 is fixedly provided on the side of the piston plate 2, the outer end of the fixing rod 2 is fixed to the outer side of the holding tube, an air outlet pipe is fixedly provided on the outer side of the bottom of the air cylinder 2, and an end of the air outlet pipe away from the air cylinder 2 is fixed to an end of the air cylinder 1 away from the telescopic tube.

[0010] Preferably, the limiting holes and limiting slots on the outer side of the fixing block are distributed in order.

[0011] Preferably, an auxiliary plate is fixedly provided on the outer side of the insertion rod.

[0012] Preferably, the scraper has a triangular cross-section.

[0013] Preferably, the upper side of the interior of the limiting groove is horizontal, and the lower side is oblique.

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

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention adjusts the position of the telescopic tube in the fixed tube through an adjusting component, and then adjusts the height of the gas collecting hood fixed to the telescopic tube, so as to adapt to the exhaust hood's demand for capturing dust or exhaust gas in different experimental processes, prevent dust or exhaust gas from escaping to the outside, and improve the ventilation and exhaust effect during the experiment.

[0016] 2. The present invention adopts a holding tube that is sleeved on pressure rod one and pressure rod two. The holding tube presses pressure rod one and pressure rod two to drive the insertion rod inserted in the limiting hole on the outside of the telescopic tube to move upward, thereby driving the telescopic tube and the gas collecting hood to move upward. At the same time, the compression spring two is used to drive the limiting block on the limiting plate to be embedded in the limiting groove on the outside of the telescopic tube to prevent the telescopic tube from moving downward under the action of gravity, thereby adjusting the height of the gas collecting hood.

[0017] 3. The auxiliary component of the present invention adopts an air pressure adjustment method. When adjusting the height of the gas collecting hood before the experiment, the pressure when the holding tube moves up and down is used to drive the scraper to move on the filter block in the telescopic tube, so as to scrape off the dust accumulated on the surface of the filter block and ensure smooth ventilation of the filter block in subsequent experiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the structure of the regulating component of the present invention; Figure 3 It is a schematic diagram of the structure of the holding member of the present invention; Figure 4 It is a schematic diagram of the structure of the limit assembly of the present invention; Figure 5 It is a schematic diagram of the structure of the limiting plate of the present invention; Figure 6 This is a schematic diagram of the auxiliary component structure of the present invention; Figure 7 It is a partial cross-sectional schematic diagram of the auxiliary component of the present invention; Figure 8 It is a schematic diagram of the connection between the limit block and the limit slot of the present invention; Fig. 9 It is a schematic diagram of the structure of the scraper and filter plate of the present invention.

[0019] In the figure: 1, fixed plate; 2, fixed pipe; 3, exhaust pipe; 4, air collecting hood; 5, telescopic pipe; 6, filter block; 7, adjustment component; 8, auxiliary component; 9, fixed block; 10, slide groove; 11, limit hole; 12, support rod; 13, pressure rod one; 14, pressure rod two; 15, slide hole; 16, plug rod; 17, holding piece; 18, limit assembly; 19, holding tube; 20, compression spring one; 21, telescopic rod; 22, slide plate; 23, fixed ring; 24, limit plate; 25, sliding box; 26, compression spring two; 27, limit block; 28, limit notch; 29, scraper; 30, fixed rod one; 31, air cylinder one; 32, piston plate one; 33, mounting frame; 34, air cylinder two; 35, piston plate two; 36, fixed rod two; 37, air outlet pipe; 38, auxiliary plate. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] Example 1: Please refer to Figure 1 - Fig. 9 , a lifting dust removal exhaust hood shown in the figure includes 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 exhaust pipe 3 connected to the external fan is arranged on the side of the fixed pipe 2, an air collecting hood 4 is arranged at the bottom of the fixed pipe 2, and also includes a telescopic pipe 5 installed inside the fixed pipe 2, the bottom end of the telescopic pipe 5 is fixedly connected to the top of the air collecting hood 4, and a filter block 6 for dust removal is fixedly arranged inside the telescopic pipe 5; and an adjusting component 7 installed outside the fixed pipe 2, and the height of the telescopic pipe 5 inside the fixed pipe 2 is controlled by the adjusting component 7; and an auxiliary component 8 installed inside the telescopic pipe 5, and the dust accumulated at the bottom of the filter block 6 is cleaned by the auxiliary component 8; It should be noted that in this scheme, a telescopic tube 5 is slidably installed on the inner side of the bottom of the fixed tube 2. After being accommodated, an air collecting hood 4 is connected to the bottom of the telescopic tube 5 to allow the dust or exhaust gas generated during the experiment to enter the telescopic tube 5 through the air collecting hood 4, and enter the fixed tube 2 after being filtered by the filter block 6 in the telescopic tube 5, and finally be discharged to the external pipeline through the exhaust pipe 3. Before the experiment starts, the height of the air collecting hood 4 is adjusted by adjusting the component 7 to adapt to the exhaust hood's need to capture dust or exhaust gas during subsequent experiments, prevent dust or exhaust gas from escaping to the outside, and improve the ventilation and exhaust effect during the experiment.

[0022] Specifically, refer to Figure 1 - Figure 6The adjustment assembly 7 includes a fixed block 9 symmetrically arranged on the front and rear sides of the telescopic tube 5, the fixed block 9 is fixed to the telescopic tube 5, a slide groove 10 is provided on the side of the fixed tube 2 to cooperate with the fixed block 9, and a uniformly distributed limit hole 11 is provided on the outer side of the fixed block 9. Two support rods 12 are symmetrically arranged on the outer side of each fixed block 9, and the support rods 12 are fixed to the fixed tube 2. The outer sides of the support rods 12 symmetrically arranged on both sides of the fixed block 9 are respectively provided with a pressure rod 13 and a pressure rod 2 14, and the middle parts of the pressure rods 13 and the pressure rods 14 are provided with a A sliding hole 15 for the support rod 12 to slide, an insertion rod 16 is provided at the connection between the pressure rod 1 13 and the pressure rod 2 14, and the insertion rod 16 is rotatably connected to the pressure rod 1 13 and the pressure rod 2 14 at the same time, one end of the insertion rod 16 is engaged with the limiting hole 11, an auxiliary plate 38 is fixedly provided on the outside of the insertion rod 16, a holding piece 17 is provided between the two pressure rods 13 and between the two pressure rods 2 14, and the holding piece 17 is provided on the side of the sliding hole 15 away from the insertion rod 16, and a limiting component 18 for controlling the height of the gas collecting hood 4 is provided on the outside of the fixed pipe 2; Among them, the holding member 17 includes a holding tube 19, and the holding tube 19 is provided with two. 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 pressure rods 13 and the two pressure rods 14. Both ends of the holding tube 19 are slidably provided with a telescopic rod 21, the outer end of the telescopic rod 21 is fixed to the pressure rod 13 or the pressure rod 2 14, and the inner end of the telescopic rod 21 is slidably connected to the inner cavity set inside the holding tube 19. One end of the telescopic rod 21 located inside the holding tube 19 is fixedly provided with The slide plate 22 has an outer diameter greater than that of the telescopic rod 21 connected thereto, so that the slide plate 22 can be limited by its outer diameter when sliding in the inner cavity of the holding tube 19, thereby preventing 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 and is disposed inside the holding tube 19. Both ends of the compression spring 20 are fixedly provided with fixing rings 23, which are rotatably disposed outside the telescopic rod 21. Furthermore, the limit assembly 18 includes a limit plate 24, a sliding box 25 is symmetrically provided on the outer side of the bottom of the fixed tube 2, the sliding box 25 is fixed on the outer side of the slide groove 10, the limit plate 24 is slidably provided in the sliding box 25, and a compression spring 26 is fixed between the outer side of the limit plate 24 and the inner side of the sliding box 25. The bottom of the limit plate 24 extends out from the opening of the side wall of the fixed tube 2, and a limit block 27 is fixed on the inner side of the bottom of the limit plate 24. The outer side of the fixed block 9 is provided with evenly distributed limit grooves 28, and the limit block 27 is embedded in the limit groove 28.

[0023] It is worth noting that reference Figure 2 , Figure 4 and Figure 8 As shown, the limiting holes 11 and the limiting slots 28 on the outside of the fixing block 9 are distributed in sequence, and the upper side of the limiting slots 28 is horizontal and the lower side is oblique.

[0024] The principle of adjusting the height of the air collecting hood 4 by adjusting the component 7: first, the personnel pulls the pressure rod 1 13 and the pressure rod 2 14 outward to take the insertion rod 16 out of the limiting hole 11, and then moves the insertion rod 16 downward to the limiting hole 11 below the outer side of the fixed block 9, and the personnel loosens the pressure rod 1 13 and the pressure rod 2 14. Under the action of the compression spring 1 20, the elastic force of the compression spring 1 20 drives the slide plate 22 to move deeper into the holding tube 19, thereby driving the two telescopic rods 21 at both ends of the holding tube 19 to approach each other, driving the two pressure rods 1 13 and the two pressure rods 2 14 to approach each other, thereby inserting the insertion rod 16 into the limiting hole 11. At this time, the pressure rod 1 13 and the pressure rod 2 14 on the insertion rod 16 form a V shape, and then, by pressing the two holding tubes 19 downward, as the pressure rod 1 13 and the pressure rod 2 14 are pressed, the insertion rod 16 is moved to the lower limit hole 11. The second 14 slides and rotates on the support rod 12 through the sliding hole 15, and then drives the telescopic tube 5 to move up in the fixed tube 2 through the insertion rod 16. During the upward movement of the telescopic tube 5, the fixed block 9 squeezes the limit block 27, and squeezes the limit block 27 out of the limit groove 28 on the outside of the fixed block 9. When the air collecting hood 4 moves to a suitable height, the limit block 27 is embedded in the limit groove 28 exposed at the bottom of the fixed tube 2 along with the limit plate 24 under the action of the compression spring 26. At this time, the top of the limit block 27 is in contact with the limit groove 28 to prevent the telescopic tube 5 from falling under the action of gravity. At this time, the insertion rod 16 is inserted into the limit hole 11 below the limit block 27, and the auxiliary plate 38 on the outside of the insertion rod 16 is against the bottom of the limit block 27, which can prevent the telescopic tube 5 from moving up under the action of external force, thereby fixing the height of the air collecting hood 4.

[0025] At the same time, reference Figure 1 , Figure 6 , Figure 7 and Fig. 9 The auxiliary component 8 includes two scrapers 29, which 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 side of the fixing rod 30 away from the scraper 29 penetrates the outer wall of the telescopic tube 5 and is fixedly provided with a piston plate 32. The piston plate 32 is slidably arranged inside the air cylinder 31. A symmetrically distributed mounting frame 33 is fixedly arranged on the outside of the telescopic tube 5. The mounting frame 33 is arranged above the air cylinder 31. An air cylinder 34 is rotatably arranged in the mounting frame 33. A piston plate 35 is slidably arranged in the air cylinder 34. A fixing rod 36 is fixedly arranged on the side of the piston plate 35. The outer end of the fixing rod 36 is fixed to the outside of the holding tube 19. An air outlet pipe 37 is fixedly arranged on the outside of the bottom of the air cylinder 34. The end of the air outlet pipe 37 away from the air cylinder 34 is fixed to the end of the air cylinder 31 away from the telescopic tube 5. The principle of the auxiliary component 8 cleaning the dust at the bottom of the filter block 6 is as follows: before adjusting the air collecting hood 4 to a suitable height by means of the holding cylinder 19, the personnel need to clean the dust at the bottom of the filter block 6. At this time, the personnel move the holding cylinder 19 up and down. The up and down movement of the holding cylinder 19 drives the piston plate 2 35 to reciprocate in the air cylinder 2 34 through the fixing rod 2 36, thereby gradually pressing the gas in the air cylinder 2 34 into the air outlet pipe 37 and the air cylinder 1 31, or gradually sucking the gas in the air cylinder 1 31 into the air outlet pipe 37 and the air cylinder 2 34. When the air in the air cylinder 2 34 When the gas in the gas cylinder 31 is gradually pressed into the gas cylinder 31, the air pressure pushes the fixed rod 30 to slide into the telescopic tube 5 through the piston plate 32, thereby pushing the two scrapers 29 at the bottom of the filter block 6 to approach each other; when the gas in the gas cylinder 31 gradually enters the gas cylinder 34, the negative pressure in the gas cylinder 31 drives the two scrapers 29 to move away from each other through the piston plate and the fixed rod 30, thereby driving the scrapers 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 collecting items such as boxes placed in advance at the bottom of the gas collecting hood 4.

[0026] In this solution, the limit block 27 is first embedded in the limit slot 28 to prevent the telescopic tube 5 from accidentally falling under the action of gravity. The insertion rod 16 is inserted into the limit hole 11 below, and then the holding tube 19 is pressed to drive the pressure rod 13 and the pressure rod 2 14 to slide on the support rod 12. The combined force of the pressure rod 13 and the pressure rod 2 14 acting on the insertion rod 16 drives the telescopic tube 5 to move up in the fixed tube 2, thereby driving the gas collecting hood 4 to move up. In the process of the telescopic tube 5 moving up, the fixed block 9 squeezes the limit block 27, and the limit block 27 is squeezed out of the limit block 27 outside the fixed block 9. When the pressure on the holding tube 19 stops, the limit block 27 is embedded in the limit slot 28 at the corresponding position, and this step is repeated until the gas collecting hood 4 is moved to a suitable height. Then, the limit block 27 is embedded in the limit slot 28 to prevent the telescopic tube 5 from falling. At the same time, the insertion rod 16 is inserted into the limit hole 11 below the limit block 27 to prevent the telescopic tube 5 from accidentally rising due to external force, thereby fixing the height of the gas collecting hood 4, which is convenient for the subsequent experiment process. The gas collecting hood 4 will inhale the dust or exhaust gas generated during the experiment in all directions to prevent the dust or exhaust gas from escaping into the indoor space; When the personnel continuously presses the holding cylinder 19, the holding cylinder 19 continuously moves up and down in the air cylinder 2 34 with the piston plate 2 35 through the fixing rod 2 36, thereby gradually pressing the gas in the air cylinder 2 34 into the air outlet pipe 37 and the air cylinder 1 31, or gradually sucking the gas in the air cylinder 1 31 into the air outlet pipe 37 and the air cylinder 2 34. When the gas in the air cylinder 2 34 is gradually pressed into the air cylinder 1 31, the air pressure pushes the fixing rod 1 30 to slide into the telescopic tube 5 through the piston plate 1 32, thereby pushing the two scrapers 29 at the bottom of the filter block 6 to approach each other; when the gas in the air cylinder 1 31 gradually enters the air cylinder 2 34, the negative pressure in the air cylinder 1 31 drives the two scrapers 29 to move away from each other through the piston plate and the fixing rod 1 30. Through the continuous approach and distance of the two scrapers 29, the dust accumulated on the bottom surface of the filter block 6 is scraped off, ensuring that in the subsequent experimental process, the dust or exhaust gas entering the air collecting hood 4 can be smoothly filtered by the filter block 6, ensuring the smooth ventilation of the entire device.

[0027] It should be noted that by driving the scraper 29 to move through air pressure, the compressibility of gas can be utilized to provide greater redundancy for the upward and downward movement range of the holding tube 19, ensuring that the scraper 29 can move normally on the surface of the filter block 6 during the process of the holding tube 19 driving the telescopic tube 5 to rise.

[0028] It should also be noted that the reference Figure 1 By symmetrically arranging the fixing blocks 9 on the center lines of both sides of the telescopic tube 5 and vertically arranging the limiting holes 11 on the center lines of the fixing blocks 9, further, the combined force direction of the pressure rods 13 and 14 exerted on the insertion rod 16 inserted in the limiting holes 11 is vertically upward and flush with the center lines of the telescopic tube 5 and the fixed tube 2, thereby ensuring that the telescopic tube 5 moves coaxially with the fixed tube 2 during the process of the pressure rods 13 and 14 driving the telescopic tube 5 upward through the insertion rod 16, thereby ensuring that the movement trajectory of the telescopic tube 5 is straight and stable, 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.

[0029] This solution adopts manual control to lift the gas collecting hood 4, does not require an external electric or pneumatic power source, is environmentally friendly, and saves energy.

[0030] Example 2: Reference Figure 6 This embodiment further explains the first embodiment, and the difference lies in the optimization of the scraper 29.

[0031] Specifically, the scraper 29 has a triangular cross section; In this solution, the triangular scraper 29 allows the scraper 29 to 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 shearing manner, which has a higher dust scraping efficiency. At the same time, when the two scrapers 29 approach each other, their oblique 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.

[0032] Embodiment 3: This embodiment further illustrates other embodiments, and the difference lies in the optimization of the material of the limiting plate 24 .

[0033] Specifically, the limit plate 24 is a brass plate. Compared with stainless steel, the limit plate 24 made of brass plate has higher flexibility and good bending resistance. As the limit block 27 continuously enters and exits the limit groove 28, the limit plate 24 made of brass plate can still maintain its initial state.

[0034] It should be noted that, in this article, relational terms such as first and second, etc. 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 terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0035] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that 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 arranged inside the telescopic tube (5); and an adjusting component (7) installed on the outside of the fixed tube (2), the height of the telescopic tube (5) inside the fixed tube (2) being controlled by the adjusting component (7); 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 through the auxiliary component (8).

2. The lifting dust removal exhaust hood according to claim 1, characterized in that: The adjustment assembly (7) comprises fixed blocks (9) symmetrically arranged on the front and rear sides of the telescopic tube (5), the fixed blocks (9) being fixed to the telescopic tube (5), a sliding groove (10) cooperating with the fixed blocks (9) being arranged on the side of the fixed tube (2), evenly distributed limiting holes (11) being arranged on the outer side of the fixed blocks (9), two support rods (12) being symmetrically arranged on the outer side of each of the fixed blocks (9), the support rods (12) being fixed to the fixed tube (2), and a pressure rod 1 (13) and a pressure rod 2 (14) being arranged on the outer side of the support rods (12) symmetrically arranged on both sides of the fixed blocks (9), respectively, the pressure rod 1 (13) and the pressure rod 2 (14) being arranged on the outer side of the support rods (12), A sliding hole (15) for sliding the support rod (12) is provided in the middle, an insertion rod (16) is provided at the connection between the pressure rod one (13) and the pressure rod two (14), the insertion rod (16) is rotatably connected to the pressure rod one (13) and the pressure rod two (14), one end of the insertion rod (16) is engaged with the limiting hole (11), a holding piece (17) is provided between the two pressure rods one (13) and between the two pressure rods two (14), the holding piece (17) is provided on the side of the sliding hole (15) away from the insertion rod (16), and a limiting component (18) for controlling the height of the air collecting hood (4) is provided on the outer side of the fixed tube (2).

3. The lifting dust removal exhaust hood according to claim 2 is characterized in that: The holding member (17) comprises a holding tube (19), wherein two holding tubes (19) are provided, and the two holding tubes (19) are symmetrically arranged on the outside of the fixing 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), and telescopic rods (21) are slidably provided at both ends of the holding tube (19), and the outer end of the telescopic rod (21) is fixed to the first pressure rod (13) or the second pressure rod (14), and the inner end of the telescopic rod (21) is slidably connected to the inner cavity provided inside the holding tube (19), and a sliding plate is fixedly provided at one end of the telescopic rod (21) located inside the holding tube (19). (22), 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) can be limited by its outer diameter when sliding in the inner cavity of the holding tube (19), thereby preventing the telescopic rod (21) from being separated from the holding tube (19), and a compression spring (20) is provided on the side of the slide plate (22) close to the telescopic rod (21), and the compression spring (20) is sleeved on the telescopic rod (21), and the compression spring (20) is arranged inside the holding tube (19), and fixing rings (23) are fixedly provided at both ends of the compression spring (20), and the fixing ring (23) is rotatably arranged on the outside of the telescopic rod (21).

4. The lifting dust removal exhaust hood according to claim 3 is characterized in that: 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), and 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).

5. The lifting dust removal exhaust hood according to claim 4, characterized in that: 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 gas cylinder (31) is arranged on the outside of the telescopic tube (5), the gas 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), the piston plate (32) is slidably arranged inside the gas cylinder (31), and the outside of the telescopic tube (5) is fixedly provided with a pair of A mounting frame (33) is arranged above the first gas cylinder (31), and a second gas cylinder (34) is rotatably arranged in the mounting frame (33), and a second piston plate (35) is slidably arranged in the second gas cylinder (34). A second fixing rod (36) is fixedly arranged on the side of the second piston plate (35), and 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 arranged 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).

6. The lifting dust removal exhaust hood according to claim 4, characterized in that: The limiting holes (11) and the limiting slots (28) on the outside of the fixing block (9) are distributed in sequence.

7. The lifting dust removal exhaust hood according to claim 2, characterized in that: An auxiliary plate (38) is fixedly provided on the outer side of the insertion rod (16).

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

9. The lifting dust removal exhaust hood according to claim 4, characterized in that: The upper side of the limiting groove (28) is horizontal, and the lower side is oblique.

10. The lifting dust removal exhaust hood according to claim 4, characterized in that: The limiting plate (24) is a brass plate.

Images