A gravity type seed cleaner

Abstract

The utility model relates to seed cleaning equipment technical field, concretely discloses a specific gravity seed cleaner, including vibrating sieve mechanism, and one side of vibrating sieve mechanism is provided with dust removal mechanism, and vibrating sieve mechanism includes support frame, and the top of support frame is connected with sieve basket subassembly, and sieve basket subassembly includes first sieve basket, second sieve basket and third sieve basket, and the top of first sieve basket, second sieve basket and third sieve basket all is provided with a plurality of mounting plate, and the below of a plurality of mounting plates all are rotatively connected with a plurality of poking rod, and dust removal mechanism includes C-shaped support, and the top of C-shaped support is provided with a plurality of dust absorption cover that is linear array distribution, and the below both ends of C-shaped support all are connected with a plurality of universal wheel that is linear array distribution, the component cleaning and maintenance of vibrating sieve mechanism in this cleaner are convenient, avoid small granule impurity and seed from the top of one bin and enter another bin, reduce the workload of seed secondary cleaning.

Description

Technical Field

[0001] This utility model relates to the field of seed cleaning equipment technology, and specifically discloses a gravity-type seed cleaner. Background Technology

[0002] Seeds are organs unique to seed plants, and their main function is reproduction. The shape, size, color, and surface texture of seeds vary from plant species to plant species. In modern seed production, gravity seed cleaners are usually used to remove impurities from seeds.

[0003] Chinese patent CN213612609U discloses a gravity-type corn seed cleaner, including a housing. Inside the housing, a frame is movably mounted via a slider. Inside the frame, a first sieve, a second sieve, and a third sieve are sequentially mounted. A rotary motor is mounted on the outside of the housing. The output end of the rotary motor is connected to a first rotating shaft. A first gear is fixed on the first rotating shaft, and the first gear meshes with a second gear. The second gear is fixed on a second rotating shaft. One end of the second rotating shaft is movably mounted on the inner wall of the housing, and the other end of the second rotating shaft is fixedly mounted with a cam. The upper end of the cam contacts the lower end of the frame. Inside the housing, there is a dispersing box, inside which a dispersing roller is mounted, and a dispersing plate is mounted on the dispersing roller. A feed inlet is installed at the lower end of the dispersing box, and an air duct is connected to the upper end of the dispersing box. The other end of the air duct is connected to a dust extraction fan. This invention provides thorough, fast, and efficient cleaning, and facilitates the removal of dust from corn seeds. However, the aforementioned seed cleaner is not convenient for cleaning and maintaining the three types of screens during use. Impurities and / or seeds after screening and cleaning tend to accumulate between the frame and the box, making cleaning inconvenient. During the screening and cleaning process, impurities such as sand and dust can easily enter the second collection box from the top of the first collection box, affecting the cleanliness of the seeds in the second collection box and increasing the workload of secondary seed cleaning. Therefore, in order to solve the above problems, this invention proposes a gravity-type seed cleaner. Utility Model Content

[0004] The present invention aims to provide a gravity-type seed cleaner, in which the components of the vibrating screening mechanism are easy to clean and maintain, and the user can easily observe the operation of the components in the cavity formed by the vibrating screening mechanism and the dust removal mechanism. It can ensure the material distribution and collection effect of the three hoppers, prevent small particles of impurities and seeds from entering the other hopper from the top of one hopper, and reduce the workload of secondary seed cleaning.

[0005] This utility model is achieved through the following technical solution: A gravity-type seed cleaner includes a vibrating screening mechanism. A dust removal mechanism is provided on one side of the vibrating screening mechanism. The vibrating screening mechanism includes a support frame, with a screen basket assembly connected above the support frame. Three hoppers arranged in a linear array are arranged below the support frame. A telescopic protective cover connects the hoppers and the support frame. The screen basket assembly includes a first screen basket, a second screen basket, and a third screen basket. Multiple mounting plates are provided above each of the first, second, and third screen baskets, and multiple actuating rods are rotatably connected below each of the mounting plates. Vertical plates are provided at both ends of the support frame, and transparent baffles are connected to one side of each of the two vertical plates. The dust removal mechanism includes a C-shaped bracket, with multiple dust suction hoods arranged in a linear array on the top of the C-shaped bracket. A feed pipe extends through the top of the C-shaped bracket near the first screen basket. Multiple casters arranged in a linear array are connected to both ends of the lower part of the C-shaped bracket.

[0006] As a further feature of the above solution, multiple springs arranged in a linear array are connected to the upper ends of both ends of the support frame, which can limit the movement direction of the components above the support frame machine. Connecting plates are connected to the upper ends of the springs at both ends. One side of each of the two connecting plates is connected to the side of the two upright plates that are close to each other, which facilitates the installation and maintenance of the springs and the support frame. A base plate is connected to the lower part of the two upright plates, which can provide support for the upright plates and their connecting components from below. The upright plates are detachably connected to the transparent baffle, which facilitates the cleaning and maintenance of the transparent baffle. A controller is provided on one side of one of the upright plates to facilitate the control of the operation of the relevant components in the cleaning machine.

[0007] As a further provision of the above scheme, a second sieve basket is provided on one side of the first sieve basket, and a third sieve basket is provided on the side of the second sieve basket away from the first sieve basket. The first, second, and third sieve baskets are all detachably connected to the support frame, which facilitates the cleaning and maintenance of the three types of sieve baskets. Multiple mounting shafts are connected to the upper sides of the first, second, and third sieve baskets. The two ends of the mounting plate are detachably connected to two mounting shafts with the center line of the mounting plate as the center of symmetry, which facilitates the adjustment of the number and installation position of the mounting plates according to actual usage needs. This increases the residence time of seeds on the three types of sieve baskets while ensuring that seeds move smoothly from the first sieve basket to the third sieve basket along the inclined direction of the support frame. The sieve holes of the first, second, and third sieve baskets increase in size in sequence, which facilitates the sequential screening of small particles of impurities, small particles of seeds, and large particles of seeds. A sealing plate is detachably connected to the end of the third sieve basket away from the first sieve basket, which facilitates the removal of impurities that cannot be screened out of the sieve holes in the third sieve basket that accumulate at the end away from the first sieve basket.

[0008] As a further feature of the above solution, cams are provided at both ends of the lower part of the support frame, and connecting shafts are provided through the middle of the two cams. The two connecting shafts pass through the interior of the two upright plates and are rotatably connected to the upright plates. A motor is connected to the end of the two connecting shafts away from the cams, so that the motor can drive the cams to rotate. The up-and-down reciprocating movement of the support frame is achieved by the contact and separation between the cams and the support frame. The outside of the motor is connected to the upright plate through a base, which can provide stable support for the motor and facilitate the installation and maintenance of the motor.

[0009] As a further feature of the above scheme, the vertical projections of the three hoppers overlap with the vertical projections of the first, second, and third screen baskets, respectively. This helps ensure that the material screened from the three screen baskets falls into the three hoppers respectively. Support rods are connected to both sides of each of the three hoppers, and the ends of two support rods are connected to two vertical plates, providing stable support for the hoppers and facilitating their installation and maintenance. The upper ends of each of the three hoppers are detachably connected to a telescopic protective cover. Two baffles are connected to the inner walls of both sides of the telescopic protective cover, and the upper parts of the two baffles are connected to the lower sides of the second screen basket, respectively. This prevents the material screened from the three screen baskets from entering one hopper from another, ensuring the effectiveness of the vibrating screening mechanism. Discharge pipes are provided at the bottom of each of the three hoppers for convenient material discharge.

[0010] As a further feature of the above solution, the upper ends of the multiple dust hoods are detachably connected to the top of the C-shaped bracket, facilitating the installation and maintenance of the dust hoods. The upper center of each of the multiple dust hoods is connected to a connecting pipe, which passes through the top of the C-shaped bracket, facilitating connection with existing vacuum cleaners and fans. This allows the dust from the seeds shaken out by the vibrating screening mechanism to be sucked out from the cavity formed by the vibrating screening mechanism and the dust removal mechanism, facilitating the injection of airflow into the cavity to blow up the dust on the seeds and improve the efficiency of removing dust from the seed surface.

[0011] At least one of the multiple casters in this application is a swivel brake caster.

[0012] The present invention has the following beneficial effects during use: The separate design of the vibrating screening mechanism and the dust removal mechanism facilitates the installation and maintenance of related components in both mechanisms. The combination of multiple mounting plates and actuating rods can provide resistance to the seeds as they move from the first screen basket to the third screen basket along the inclined direction of the support frame, thereby extending the residence time of the seeds on the three screen baskets and ensuring the screening effect of the screen baskets on the seeds.

[0013] The design of the retractable protective cover and baffles can prevent the hopper from moving along with the support frame and screen basket assembly during the up and down movement, and prevent the material screened out of the three screen baskets from entering the other hopper, thus ensuring the quality of seed screening and reducing the workload of secondary seed cleaning.

[0014] The design of multiple casters in the dust removal mechanism makes it easy to adjust the position of the dust removal mechanism, saving users the effort of moving the dust removal mechanism. The combination of multiple dust suction hoods and connecting pipes makes it easy for users to connect the connecting pipes to the original vacuum cleaner and fan according to the amount of dust contained in the seeds. This allows the dust generated by the vibration of the vibrating screening mechanism to be sucked out from the cavity formed between the vibrating screening mechanism and the dust removal mechanism, making it easier to blow the dust on the seeds, making it easier for the vacuum cleaner to suck up the dust, and speeding up the efficiency of removing dust from the seed surface. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a perspective view of the internal structure of this utility model; Figure 2 This is a perspective view of the present invention; Figure 3 This is a perspective view of the combination of the support frame and the sieve basket assembly in this utility model; Figure 4 This is a perspective view of the assembly of components such as the neutral plate and the base plate of this utility model; Figure 5 This is a front view of the assembly of components such as the neutral plate and the base plate of this utility model; Figure 6 This is a perspective view of the assembly of components such as the hopper and baffle in this utility model; Figure 7 This is a perspective view of the dust removal mechanism in this utility model; Figure 8 This is a side view of the dust removal mechanism in this utility model.

[0017] In the diagram: 1. Vibrating screening mechanism; 2. Dust removal mechanism; 3. Controller; 11. Support frame; 111. Spring; 112. Connecting plate; 12. Screen basket assembly; 121. First screen basket; 122. Mounting shaft; 123. Second screen basket; 124. Third screen basket; 125. Sealing plate; 13. Mounting plate; 131. Actuating rod; 14. Cam; 141. Connecting shaft; 15. Motor; 151. Base; 16. Vertical plate; 17. Hopper; 171. Discharge pipe; 172. Telescopic protective cover; 173. Baffle plate; 174. Support rod; 18. Base plate; 19. Transparent baffle plate; 21. C-shaped bracket; 22. Feed pipe; 23. Casters; 24. Dust suction hood; 241. Connecting pipe. Detailed Implementation

[0018] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0019] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The following will refer to the appendix... Figures 1-8 This application will be described in detail with reference to the embodiments.

[0020] An embodiment discloses a gravity-type seed cleaner, including a vibrating screening mechanism 1. A dust removal mechanism 2 is provided on one side of the vibrating screening mechanism 1. The vibrating screening mechanism 1 includes a support frame 11, a screen basket assembly 12 connected above the support frame 11, and three material bins 17 arranged in a linear array below the support frame 11. A telescopic protective cover 172 connects the material bins 17 and the support frame 11. The screen basket assembly 12 includes a first screen basket 121, a second screen basket 123, and a third screen basket 124. Multiple mounting plates 13 are provided above each of the 24, and multiple toggle levers 131 are rotatably connected to the bottom of each of the mounting plates 13. Upright plates 16 are provided at both ends of the support frame 11, and transparent baffles 19 are connected to one side of each of the two upright plates 16. The dust removal mechanism 2 includes a C-shaped bracket 21, and multiple dust suction hoods 24 arranged in a linear array are provided on the top of the C-shaped bracket 21. A feed pipe 22 is provided through the top of the C-shaped bracket 21 near the first screen basket 121. Multiple casters 23 arranged in a linear array are connected to both ends of the bottom of the C-shaped bracket 21.

[0021] like Figure 1 , Figure 2 , Figure 4 and Figure 5 As shown, multiple springs 111 arranged in a linear array are connected to the upper ends of the support frame 11, which can limit the movement direction of the components above the machine. Connecting plates 112 are connected to the upper ends of the springs 111 at both ends. One side of each of the two connecting plates 112 is connected to the side of the two upright plates 16 that are close to each other, which facilitates the installation and maintenance of the springs 111 and the support frame 11. A base plate 18 is connected to the lower part of the two upright plates 16, which can provide support for the upright plates 16 and their connecting components from below. The upright plates 16 are detachably connected to the transparent baffle 19, which facilitates the cleaning and maintenance of the transparent baffle 19. A controller 3 is provided on one side of one of the upright plates 16, which facilitates the control of the operation of the relevant components in the cleaning machine.

[0022] like Figure 1 and Figure 3 As shown, a second screen basket 123 is provided on one side of the first screen basket 121, and a third screen basket 124 is provided on the side of the second screen basket 123 away from the first screen basket 121. The first screen basket 121, the second screen basket 123, and the third screen basket 124 are all detachably connected to the support frame 11, which facilitates the cleaning and maintenance of the three types of screen baskets. Multiple mounting shafts 122 are connected to the upper sides of the first screen basket 121, the second screen basket 123, and the third screen basket 124. The two ends of the mounting plate 13 are detachably connected to two mounting shafts 122 with the center line of the mounting plate 13 as the center of symmetry, which facilitates adjustment according to actual usage requirements. The number and installation position of the loading plates 13 are adjusted to increase the residence time of seeds on the three types of sieves while ensuring that the seeds move smoothly from the first sieve 121 to the third sieve 124 along the inclined direction of the support frame 11. The sieve holes of the first sieve 121, the second sieve 123 and the third sieve 124 increase in size in sequence to facilitate the sequential screening of small impurities, small seeds and large seeds. The end of the third sieve 124 away from the first sieve 121 is detachably connected to a sealing plate 125 to facilitate the removal of impurities that cannot be screened through the sieve holes of the third sieve 124 from the end of the third sieve 124 away from the first sieve 121.

[0023] like Figure 1 , Figure 4 and Figure 5As shown, cams 14 are provided at both ends of the lower part of the support frame 11. A connecting shaft 141 is provided through the middle of the two cams 14. The two connecting shafts 141 pass through the interior of the two upright plates 16 and are rotatably connected to the upright plates 16. A motor 15 is connected to the end of the two connecting shafts 141 away from the cams 14, so that the motor 15 can drive the cams 14 to rotate. The up-and-down reciprocating movement of the support frame 11 is realized by the contact and separation between the cams 14 and the support frame 11. The outer side of the motor 15 is connected to the upright plate 16 through the base 151, which can provide stable support for the motor 15 and facilitate the installation and maintenance of the motor 15.

[0024] like Figure 1 and Figure 6 As shown, the vertical projections of the three hoppers 17 overlap with the vertical projections of the first screen basket 121, the second screen basket 123, and the third screen basket 124, respectively. This helps ensure that the material screened from the three screen baskets falls into the three hoppers 17 respectively. Support rods 174 are connected to both sides of each of the three hoppers 17. The two ends of each of the two support rods 174 are connected to two vertical plates 16, which can provide stable support for the hoppers 17 and facilitate the installation and maintenance of the hoppers 17. The upper ends of each of the three hoppers 17 are detachably connected to a telescopic protective cover 172. Two baffles 173 are connected to the inner walls of both sides of the telescopic protective cover 172. The upper sides of the two baffles 173 are connected to the lower sides of the second screen basket 123, respectively. This can prevent the material screened from the three screen baskets from entering one hopper 17 into another, ensuring the effectiveness of the vibrating screening mechanism 1. Discharge pipes 171 are provided at the bottom of each of the three hoppers 17 for convenient material discharge.

[0025] like Figure 1 , Figure 2 , Figure 7 and Figure 8 As shown, the upper ends of the multiple dust collection hoods 24 are detachably connected to the top of the C-shaped bracket 21, which facilitates the installation and maintenance of the dust collection hoods 24. The upper middle part of the multiple dust collection hoods 24 is connected to a connecting pipe 241, which passes through the top of the C-shaped bracket 21, making it convenient to connect with the existing vacuum cleaner and fan, so as to suck out the dust in the seeds shaken out by the vibrating screening mechanism 1 from the cavity formed by the vibrating screening mechanism 1 and the dust removal mechanism 2, and to facilitate the injection of airflow into the cavity to blow up the dust on the seeds, thereby improving the efficiency of removing dust from the seed surface.

[0026] The gravity-type seed cleaner disclosed in this embodiment determines whether a dust removal mechanism 2 is needed before use based on the dust content in the seeds to be cleaned. When the dust content in the seeds is low and there are many large particles of impurities, the dust removal mechanism 2 is not needed. A sieve basket with a suitable sieve hole diameter is selected according to the size of the seeds and installed sequentially on the support frame 11. The three existing receiving components are sequentially connected to the discharge pipes 171 below the three hoppers 17. The controller 3 starts two motors 15, causing them to drive the cam 14 to rotate via the connecting shaft 141. When the two tips of the cam 14 contact the support frame 11, they push the support frame 11 upwards, compressing the spring 111. When the two tips of the cam 14 separate from the support frame 11, the support frame 11 moves downwards under gravity. This cycle repeats to achieve the reciprocating up-and-down movement of the support frame 11 and its upper components. The seeds to be cleaned are placed from above the first sieve basket 121. The support frame 11 and the sieve basket assembly 1... 2. During the vibration process, the seeds and impurities move together towards the third screen basket 124. During the movement, the smallest particles fall into the hopper 17 below the first screen basket 121, the medium-sized particles fall into the hopper 17 below the second screen basket 123, and the largest particles pass through the screen holes of the third screen basket 124 and fall into the third hopper 17. The materials in the three hoppers 17 are discharged from the hoppers 17 through the discharge pipes 171 below the three hoppers 17 respectively. During the movement, the actuating rod 131 contacts the seeds and impurities, increasing the resistance to the falling of the seeds and impurities and prolonging the time that the seeds and impurities stay on the first screen basket 121 and the second screen basket 123, ensuring the efficiency of screening small particles and medium-sized particles falling through the screen holes of the first screen basket 121 and the second screen basket 123. After screening is completed, the motor 15 is turned off, the sealing plate 125 at one end of the third screen basket 124 is removed, and the material that did not leak through the screen holes of the third screen basket 124 is cleaned up.

[0027] When there is a lot of dust in the seeds to be cleaned, in order to ensure the cleanliness of the working environment, the dust removal mechanism 2 needs to be used for dust removal. Release the brake of the brake wheel in the universal wheel 23, move the dust removal mechanism 2 to the side of the vibrating screening mechanism 1 away from the transparent baffle 19, align the open end of the C-shaped bracket 21 with the vibrating screening mechanism 1, move the C-shaped bracket 21 to the outside of the vibrating screening mechanism 1, and when one side of the C-shaped bracket 21 is close to the side of the upright plate 16 away from the transparent baffle 19, step on the brake of the brake wheel to fix the dust removal mechanism 2, connect at least one connecting pipe 241 to the original fan, and connect the remaining connecting pipe 241 to the original vacuum cleaner, use the controller 3 to start the motor 15, the original fan and the vacuum cleaner, and put the seeds to be cleaned into the screen basket assembly 12 from the feed pipe 22, so that the seeds pass through the feed pipe 22. The seeds fall into the inner side of the first sieve basket 121 for vibrating sieving. During the vibrating sieving process, the dust on the seeds is shaken up and separated from the seeds. It is blown by the fan and floats into the cavity formed by the vibrating sieving mechanism 1 and the dust removal mechanism 2. It is then sucked out by the vacuum cleaner and enters the vacuum cleaner through the dust hood 24 and the connecting pipe 241 connected to the vacuum cleaner to prevent the dust from floating in the air of the working environment. The situation inside the cavity is observed through the transparent baffle 19. The operating speed of the vacuum cleaner and the fan is adjusted in time according to the dust floating inside the cavity to ensure the dust removal effect in the cavity. After cleaning, the connection between the fan, the vacuum cleaner and the connecting pipe 241 is disconnected, the brake of the brake wheel in the universal wheel 23 is released, and the dust removal mechanism 2 is moved away from the outside of the vibrating sieving mechanism 1. The relevant components in the vibrating sieving mechanism 1 and the dust removal mechanism 2 can then be cleaned and maintained.

[0028] The components disclosed in this utility model, including the controller 3, support frame 11, spring 111, connecting plate 112, first sieve basket 121, second sieve basket 123, third sieve basket 124, sealing plate 125, cam 14, connecting shaft 141, motor 15, hopper 17, telescopic protective cover 172, baffle 173, transparent baffle 19, caster wheel 23, dust suction cover 24, and connecting pipe 241, are all general standard parts or parts known to those skilled in the art. Their structure and principle can be learned by those skilled in the art through technical manuals or conventional experimental methods.

[0029] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A gravity-type seed cleaner, comprising a vibrating screening mechanism, characterized in that, A dust removal mechanism is provided on one side of the vibrating screening mechanism. The vibrating screening mechanism includes a support frame, a screen basket assembly is connected above the support frame, and three material bins arranged in a linear array are provided below the support frame. A telescopic protective cover is connected between the material bins and the support frame. The screen basket assembly includes a first screen basket, a second screen basket, and a third screen basket. Multiple mounting plates are provided above the first, second, and third screen baskets, and multiple actuating rods are rotatably connected below the mounting plates. Vertical plates are provided at both ends of the support frame, and transparent baffles are connected to one side of the two vertical plates. The dust removal mechanism includes a C-shaped bracket, multiple dust suction hoods arranged in a linear array are provided on the top of the C-shaped bracket, and a feed pipe is provided through the top of the C-shaped bracket near the first screen basket. Multiple casters arranged in a linear array are connected to both ends of the bottom of the C-shaped bracket.

2. The specific gravity seed cleaner according to claim 1, characterized in that, Multiple springs arranged in a linear array are connected to the top of both ends of the support frame. A connecting plate is connected to the top of each spring. One side of each connecting plate is connected to the side of each of the two upright plates that are close to each other. A base plate is connected to the bottom of each of the two upright plates. The upright plates are detachably connected to the transparent baffle. A controller is provided on one side of one of the upright plates.

3. The specific gravity seed cleaner according to claim 1, characterized in that, A second screen basket is provided on one side of the first screen basket, and a third screen basket is provided on the side of the second screen basket away from the first screen basket. The first, second, and third screen baskets are all detachably connected to the support frame. Multiple mounting shafts are connected to the upper sides of the first, second, and third screen baskets. The two ends of the mounting plate are detachably connected to two mounting shafts with the center line of the mounting plate as the center of symmetry. The screen holes of the first, second, and third screen baskets increase in size sequentially. A sealing plate is detachably connected to the end of the third screen basket away from the first screen basket.

4. A specific gravity seed cleaner according to claim 1, characterized in that, Cams are provided at both ends of the lower part of the support frame. A connecting shaft is provided through the middle of each of the two cams. The two connecting shafts pass through the interior of the two upright plates and are rotatably connected to the upright plates. A motor is connected to the end of each connecting shaft away from the cam. The outside of the motor is connected to the upright plate through a base.

5. A specific gravity seed cleaner according to claim 1, characterized in that, The vertical projections of the three hoppers overlap with the vertical projections of the first, second, and third sieves, respectively. Each of the three hoppers has a support rod connected to both sides, and the two ends of each support rod are connected to two vertical plates. The upper ends of each of the three hoppers are detachably connected to a telescopic protective cover. The inner walls of both sides of the telescopic protective cover are connected to two baffles, and the upper ends of the two baffles are connected to the lower sides of the second sieve, respectively. Each of the three hoppers has a discharge pipe at its lower end.

6. A specific gravity seed cleaner according to claim 1, characterized in that, The upper ends of the multiple vacuum hoods are detachably connected to the top of the C-shaped bracket, and a connecting tube is connected to the upper center of the multiple vacuum hoods. The multiple connecting tubes pass through the top of the C-shaped bracket.

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