Atomic absorption cover for experimental detection

Abstract

The invention relates to the technical field of experimental instruments, in particular to an atomic absorption cover for experimental detection, which comprises an expansion cover and an air guide barrel fixedly mounted at the upper end of the expansion cover, a gathering cover is mounted at the upper end of the air guide barrel, an induced draft fan is fixedly mounted at the upper end of the gathering cover, an exhaust pipe is arranged on one side of the induced draft fan, and an air outlet is formed in the other side of the induced draft fan. Two air distribution plates are fixedly mounted in the air guide cylinder; compared with the prior art, by arranging the expansion cover, the adjusting mechanism, the first air guide plate, the second air guide plate and the air distribution plate arranged in the air guide barrel, multi-mode selection during air absorption can be achieved, and according to actual use requirements, large-area air suction or channel air suction can be freely switched for use; according to the atomic absorption cover, the defects of a traditional fixed atomic absorption cover are overcome, large-area air suction can be achieved, harmful gas is prevented from overflowing, powerful air suction in a small-area range can also be achieved, and the air suction effect is improved.

Description

Technical Field

[0001] The invention relates to the technical field of experimental instruments, in particular to an atomic absorption cover used for experimental detection. Background Art

[0002] The atomic absorption hood is one of the essential equipment in the laboratory. It is mainly used to quickly discharge small-scale dust, hot air, volatile gases, harmful gases and other small-particle suspended matter or gases generated in the experiment or production process, and is used to protect the health of operators and surrounding personnel.

[0003] At present, traditional atomic absorption hoods are generally divided into two types, top type and desktop type. The top type atomic absorption hood is installed above the experimental operating table, and has the advantage of a wide absorption range, but its suction force is relatively dispersed, and the exhaust effect is not ideal; while the desktop atomic absorption hood is generally fixedly installed on the top of the concentrated absorption area, with a small absorption range, but strong concentrated suction force, but there is also a possibility of some gas overflowing outside its suction range, and thus there are also certain absorption problems. For this reason, the present invention proposes an atomic absorption hood for experimental detection. Summary of the invention

[0004] The object of the present invention is to provide an atomic absorption cover for experimental detection to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an atomic absorption hood for experimental detection, comprising an expansion hood and an air guide tube fixedly installed on the upper end of the expansion hood, a gathering hood is installed on the upper end of the air guide tube, an induced draft fan is fixedly installed on the upper end of the gathering hood, an exhaust pipe is arranged on one side of the induced draft fan, two air distribution plates are fixedly installed inside the air guide tube, and an adjustment mechanism is installed at the bottom position of the front inner wall of the air guide tube, a first air guide plate and a second air guide plate are rotatably installed at the lower end of the adjustment mechanism, and the first air guide plate and the second air guide plate are both arranged in the expansion hood, winders are installed on the outer walls of both sides of the expansion hood, isolation membranes are wound around the two winders, and the ends of the two isolation membranes away from the winders are respectively installed at the bottom of the first air guide plate and the second air guide plate.

[0006] As a preferred technical solution of the present invention, the adjustment mechanism includes an adjustment box, in which four horizontally arranged gears are rotatably installed, and adjacent gears are meshed with each other. The four gears are, from left to right, a first adjustment gear, a driving gear, a linkage gear, and a second adjustment gear. A motor is installed on the outside of the air guide cylinder, and the driving gear is fixedly connected to the output shaft of the motor. The first air guide plate is fixed to the first adjustment gear, and the second air guide plate is fixed to the second adjustment gear.

[0007] As a preferred technical solution of the present invention, the winder includes a support frame fixedly connected to the expansion cover, a rotating rod is rotatably mounted on the support frame, a winding drum is fixedly connected to the outer surface of the rotating rod, and the isolation film is wound around the outer surface of the winding drum.

[0008] As a preferred technical solution of the present invention, a fixing sleeve is fixedly installed on one side wall of the support frame, and the fixing sleeve is arranged on the outer surface of the rotating rod, and a coil spring is connected between the rotating rod and the fixing sleeve.

[0009] As a preferred technical solution of the present invention, bases are fixedly installed at the lower ends of the first air guide plate and the second air guide plate, mounting blocks are installed on the two bases, and the isolation membrane is fixedly connected to the mounting blocks.

[0010] As a preferred technical solution of the present invention, the expansion cover is rotatably mounted with two sets of pulleys at the position of the first opening, and the isolation membrane is arranged between the two sets of pulleys.

[0011] As a preferred technical solution of the present invention, a baffle is slidably installed between the two air distribution plates, an electric cylinder is fixedly installed on the outside of the air guide cylinder, and the baffle is fixedly connected to the output rod of the electric cylinder.

[0012] As a preferred technical solution of the present invention, the first air guide plate and the second air guide plate are both provided with a second opening.

[0013] As a preferred technical solution of the present invention, the cross-section of the expansion cover is an isosceles trapezoidal structure.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] The atomic absorption hood for experimental detection of the present invention can realize multi-mode selection during gas absorption by arranging an expansion hood, an adjustment mechanism, a first air guide plate, a second air guide plate and an air distribution plate arranged inside an air guide tube. According to actual use requirements, it can be switched arbitrarily between large-area suction and channel suction, thereby solving the shortcomings of traditional fixed atomic absorption hoods. It can realize large-area suction to prevent the overflow of harmful gases, and can also realize strong suction in a small area to improve the suction effect.

[0016] Other features and advantages of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0018] Figure 2 For the present invention Figure 1 Sectional view of AA in the middle;

[0019] Figure 3 For the present invention Figure 1 A magnified schematic diagram of the structure at B in the middle;

[0020] Figure 4 It is an enlarged schematic diagram of the structure of the first opening of the isolation film of the present invention when it is rolled up;

[0021] Figure 5 It is a side structural schematic diagram of the reel of the present invention;

[0022] Figure 6 It is a schematic diagram of the top view of the structure of the reel of the present invention;

[0023] Figure 7 It is a structural schematic diagram of the coil spring of the present invention;

[0024] In the figure: 1, expansion hood; 11, first opening; 12, pulley; 2, air guide tube; 3, induced draft fan; 31, gathering hood; 32, exhaust pipe; 4, adjustment mechanism; 41, motor; 42, driving gear; 43, first adjustment gear; 44, linkage gear; 45, second adjustment gear; 51, first air guide plate; 52, second air guide plate; 53, base; 54, mounting block; 55, second opening; 56, magnetic strip; 57, groove; 58, clamp; 6, air distributor; 71, baffle; 72, electric cylinder; 8, winder; 81, support frame; 82, rotating rod; 83, winder drum; 84, fixing sleeve; 85, coil spring; 9, isolation membrane. DETAILED DESCRIPTION

[0025] 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.

[0026] In the description of the present invention, it should be noted that the terms "vertical", "up", "down", "horizontal", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0027] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] See also Figure 1-7 In this embodiment, an atomic absorption hood for experimental detection is provided, including an expansion hood 1 and an air guide 2 fixedly installed at the upper end of the expansion hood 1, a gathering hood 31 is installed at the upper end of the air guide 2, a draft fan 3 is fixedly installed at the upper end of the gathering hood 31, an exhaust pipe 32 is arranged on one side of the draft fan 3, two air distribution plates 6 are fixedly installed inside the air guide 2, and an adjustment mechanism 4 is installed at the bottom position of the front inner wall of the air guide 2, a first air guide plate 51 and a second air guide plate 52 are rotatably installed at the lower end of the adjustment mechanism 4, and the first air guide plate 51 and the second air guide plate 52 are both arranged in the expansion hood 1, and a reel is installed on the outer walls of both sides of the expansion hood 1 8. An isolation film 9 is wound around the two winders 8. The ends of the two isolation films 9 away from the winders 8 are respectively installed at the bottom of the first air guide plate 51 and the second air guide plate 52. By arranging the expansion hood 1, the adjustment mechanism 4, the first air guide plate 51, the second air guide plate 52 and the air distribution plate 6 arranged inside the air guide tube 2, multi-mode selection during gas absorption can be achieved. According to actual usage requirements, it can be switched arbitrarily between large-area suction or channel suction, which solves the shortcomings of traditional fixed atomic absorption hoods, can achieve large-area suction to prevent the overflow of harmful gases, and can also achieve strong suction in a small area to improve the suction effect.

[0029] In this embodiment, the adjustment mechanism 4 includes an adjustment box, in which four horizontally arranged gears are rotatably installed, and adjacent gears are meshed with each other. The four gears are, from left to right, a first adjustment gear 43, a driving gear 42, a linkage gear 44, and a second adjustment gear 45. A motor 41 is installed on the outside of the air guide cylinder 2, and the driving gear 42 is fixedly connected to the output shaft of the motor 41. The first air guide plate 51 is fixed to the first adjustment gear 43, and the second air guide plate 52 is fixed to the second adjustment gear 45. The winder 8 includes a support frame 81 fixedly connected to the expansion cover 1, a rotating rod 82 is rotatably installed on the support frame 81, and a winding drum 83 is fixedly connected to the outer surface of the rotating rod 82, and the isolation film 9 is wound on the winding drum. On the outer surface of the cylinder 83, a fixing sleeve 84 is fixedly installed on one side wall of the support frame 81, and the fixing sleeve 84 is sleeved on the outer surface of the rotating rod 82, and a coil spring 85 is connected between the rotating rod 82 and the fixing sleeve 84. The two isolation membranes 9 respectively penetrate the two side walls of the expansion cover 1, and the two side walls of the expansion cover 1 are provided with a first opening 11 at the position of the isolation membrane 9. A plurality of magnetic strips 56 are fixedly installed on one end of the mounting block 54 close to the isolation membrane 9, and the plurality of magnetic strips 56 are combined into a rectangular groove 57. The groove 57 can be used as the accommodation space of the pulley 12, so that the mounting block 54 fits with the surface of the expansion cover 1, thereby realizing the blocking of the first opening 11, and preventing the absorption cover from being sucked when the air ducts on the two sides are used. The air inside flows out through the first opening 11, and the lower ends of the first air guide plate 51 and the second air guide plate 52 are fixedly installed with a base 53, and the two bases 53 are installed with a mounting block 54, and the isolation film 9 is fixedly connected to the mounting block 54, and a clamp 58 is provided on the mounting block 54, and the base 53 is provided with a clamping groove adapted to the clamp 58. When in use, when a large area of ​​air is required to be inhaled, the mounting block 54 on the base 53 can be removed, and at this time, the winding spring 85 can be used to allow the rotating rod 82 and the winding drum 83 to rotate, so that the isolation film 9 can be rolled up, thereby opening the gas channels on both sides of the first air guide plate 51 and the second air guide plate 52, so that all areas in the expansion hood 1 can be used for gas absorption, and when it is needed When air is to be sucked in a small area, the mounting block 54 is mounted on the base 53 again, and the isolation membrane 9 can be used to block the existing air distribution channel, so that air can be sucked in the area between the first air guide plate 51 and the second air guide plate 52. After the gas passes through the area, it passes between the two air distribution plates 6 and is finally sucked out by the induced draft fan 3. It should be noted that only one mounting block 54 can be installed, that is, only a single lateral wind channel is blocked, thereby improving the control and use flexibility. In order to improve the smooth winding effect of the isolation membrane 9, the expansion hood 1 is rotatably installed with two sets of pulleys 12 at the position of the first opening 11, and the isolation membrane 9 is arranged between the two sets of pulleys. The pulley 9 can be used to prevent the isolation membrane 9 from being scratched when it is wound.

[0030] In this embodiment, a baffle plate 71 is slidably installed between the two air distribution plates 6, an electric cylinder 72 is fixedly installed on the outside of the air guide tube 2, and the baffle plate 71 is fixedly connected to the output rod of the electric cylinder 72. A second opening 55 is provided on the first air guide plate 51 and the second air guide plate 52. When only a single side channel or two side channels are needed to absorb gas, the electric cylinder 72 can be started to drive the baffle plate 71 to move horizontally, so that the area between the two air distribution plates 6 can be blocked, so that the single side channel or the two side channels can switch to the gas absorption mode. When the side channel or the middle channel between the first air guide plate 51 and the second air guide plate 52 is used, in order to prevent the gas from overflowing due to the small area of ​​the suction end, the second opening 55 is provided. , the channel that is not in use can temporarily collect the gas and transfer it to the adjacent gas channel in use through the second port 55, thereby effectively solving the problem of gas overflow in the small-area absorption cover. For example, when the electric cylinder 72 drives the baffle 71 to close, the atomic absorption cover now uses a single-sided channel for absorption. When the gas below is absorbed through the channel on the left side of the first air guide plate 51 or the right side of the second air guide plate 52, the suction end area of ​​the single-sided channel is too small, so it is easy for the gas below to overflow into the middle channel between the first air guide plate 51 and the second air guide plate 52. At this time, the overflowing gas will be transferred to the adjacent single-sided channel in use through the second port 55, thereby effectively solving the problem of gas overflow in the small-area absorption cover.

[0031] 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. An atomic absorption cover for experimental detection, characterized in that: The invention comprises an expansion hood (1) and an air guide tube (2) fixedly mounted on the upper end of the expansion hood (1); a gathering hood (31) is mounted on the upper end of the air guide tube (2); an induced draft fan (3) is fixedly mounted on the upper end of the gathering hood (31); an exhaust pipe (32) is arranged on one side of the induced draft fan (3); two air distribution plates (6) are fixedly mounted inside the air guide tube (2); an adjustment mechanism (4) is mounted at the bottom of the inner wall of the front side of the air guide tube (2); the adjustment mechanism ( 4), and the first air guide plate (51) and the second air guide plate (52) are rotatably mounted at the lower end thereof, and the first air guide plate (51) and the second air guide plate (52) are both arranged in the expansion hood (1), and reels (8) are mounted on the outer walls on both sides of the expansion hood (1), and isolation films (9) are wound around the two reels (8), and the ends of the two isolation films (9) away from the reels (8) are respectively mounted on the bottom of the first air guide plate (51) and the bottom of the second air guide plate (52).

2. The atomic absorption cover for experimental detection according to claim 1, characterized in that: The regulating mechanism (4) comprises an regulating box, in which four horizontally arranged gears are rotatably mounted, and adjacent gears are meshed with each other. The four gears are, from left to right, a first regulating gear (43), a driving gear (42), a linkage gear (44), and a second regulating gear (45). A motor (41) is mounted outside the air guide cylinder (2), and the driving gear (42) is fixedly connected to an output shaft of the motor (41). The first air guide plate (51) is fixed to the first regulating gear (43), and the second air guide plate (52) is fixed to the second regulating gear (45).

3. The atomic absorption cover for experimental detection according to claim 1, characterized in that: The reel (8) comprises a support frame (81) fixedly connected to the expansion hood (1), a rotating rod (82) is rotatably mounted on the support frame (81), a reel (83) is fixedly connected to the outer surface of the reel (82), and the isolation film (9) is wound around the outer surface of the reel (83).

4. The atomic absorption cover for experimental detection according to claim 3, characterized in that: A fixing sleeve (84) is fixedly mounted on one side wall of the support frame (81), and the fixing sleeve (84) is sleeved on the outer surface of the rotating rod (82), and a coil spring (85) is connected between the rotating rod (82) and the fixing sleeve (84).

5. The atomic absorption cover for experimental detection according to claim 1, characterized in that: Bases (53) are fixedly mounted at the lower ends of the first air guide plate (51) and the second air guide plate (52), mounting blocks (54) are mounted on the two bases (53), and the isolation membrane (9) is fixedly connected to the mounting blocks (54).

6. The atomic absorption cover for experimental detection according to claim 1, characterized in that: The two isolation membranes (9) respectively penetrate the two side walls of the expansion cover (1), and the two side walls of the expansion cover (1) are both provided with first openings (11) at positions corresponding to the isolation membranes (9).

7. The atomic absorption cover for experimental detection according to claim 6, characterized in that: The expansion cover (1) is rotatably mounted with two sets of pulleys (12) at the position of the first opening (11), and an isolation membrane (9) is arranged between the two sets of pulleys.

8. The atomic absorption cover for experimental detection according to claim 1, characterized in that: A baffle (71) is slidably mounted between the two air distribution plates (6), an electric cylinder (72) is fixedly mounted on the outside of the air guide cylinder (2), and the baffle (71) is fixedly connected to an output rod of the electric cylinder (72).

9. The atomic absorption cover for experimental detection according to claim 1, characterized in that: The cross section of the expansion cover (1) is an isosceles trapezoidal structure.

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