Atomic absorption cell

Abstract

The application provides an atomic absorption cover, which comprises a cover body, a ventilation pipe I connected to the upper end of the cover body, a ventilation pipe II connected to the ventilation pipe I through a corrugated expansion pipe, two symmetrical and vertically distributed vertical rods fixed in the ventilation pipe I, the vertical rods extending into the ventilation pipe II and being slidably connected with the ventilation pipe II in the vertical direction, an electric drive structure connected with the two vertical rods in the ventilation pipe II, and the electric drive structure being capable of driving the two vertical rods to synchronously ascend and descend. The cover body can be lifted to adjust the height of the cover body by only opening and closing the electric drive structure, so that the operation is convenient, and the high-altitude operation is not needed, thereby solving the problem of the danger of the high-altitude operation of the workers.

Description

Technical Field

[0001] This application relates to laboratory ventilation technology, and more particularly to an atomic absorption hood. Background Technology

[0002] Atomic absorption hoods are key equipment in laboratories for localized exhaust ventilation, primarily used for the rapid removal of harmful gases generated during the use of instruments such as atomic absorption spectrometers and gas chromatographs.

[0003] However, the atomic absorption hoods used in existing laboratories are generally adjusted manually. The installation height of the atomic absorption hood is usually 1700-2000mm above the ground and 900-1200mm above the experimental table. The locking structure for adjusting the height of the atomic absorption hood is usually located above the atomic absorption hood. When adjusting the height of the atomic absorption hood manually, it requires 2-3 people to work together (1-2 people hold up the atomic absorption hood and another person manually operates the locking structure). It also requires the use of A-frame ladders for climbing work. Not only is the operation complicated, but climbing work also poses certain dangers. Utility Model Content

[0004] This application provides an atomic absorption hood to solve the problems of complex operation and dangers associated with manual height adjustment of existing atomic absorption hoods.

[0005] This application provides an atomic absorption shield, including a shield body, wherein the upper end of the shield body is connected to a ventilation pipe I, and the ventilation pipe I is connected to a ventilation pipe II through a corrugated telescopic pipe; The ventilation duct I has two symmetrical and vertically distributed vertical rods fixed inside, and the vertical rods extend into the ventilation duct II and slide in the vertical direction to connect with the ventilation duct II. The ventilation duct II is equipped with an electric drive structure connected to two vertical rods, and the electric drive structure can drive the two vertical rods to rise and fall synchronously.

[0006] Optionally, the vertical rod is a rack and pinion; The electric drive structure includes a mounting bracket fixed inside the ventilation duct II. The mounting bracket is equipped with a motor and two gears that mesh with two racks respectively. The motor is connected to the two gears simultaneously through a self-locking transmission structure and drives the two gears to rotate synchronously in opposite directions.

[0007] Optionally, the transmission structure includes a mounting shaft mounted on a mounting bracket, on which two worms with opposite directions of rotation are provided. Each worm meshes with a worm wheel adapted to it, and the two worm wheels are respectively fixedly connected to two gears. The motor is connected to the mounting shaft via a chain drive mechanism.

[0008] Optionally, the mounting frame is a hollow box structure, and the gears, transmission structure, chain drive mechanism and motor are all located inside the mounting frame; The rack passes through the mounting frame and is slidably connected to the mounting frame in the vertical direction.

[0009] Optionally, the rack includes a plate with a rounded rectangular cross-section, and teeth are provided on one side of the plate; The mounting bracket has two through slots that are vertically connected and adapted to the rack. The rack passes through the through slots and is slidably connected to them. The through slots can be positioned horizontally relative to the plate.

[0010] Optionally, the upper end of the rack is fixed with a limiting plate that can contact the upper end of the mounting bracket.

[0011] Optionally, the upper end of the mounting bracket is detachably fixed with a box cover, and the mounting bracket is detachably fixed to the inner wall of the ventilation duct II.

[0012] The atomic absorption hood provided in this application uses a corrugated telescopic tube connected between ventilation duct I and ventilation duct II. Two vertical rods are fixed inside ventilation duct I, extending into and slidably connected to ventilation duct II. These two vertical rods are connected to an electric drive structure that enables them to rise and fall synchronously. During use, operators only need to control the opening and closing of the electric drive structure to raise and lower ventilation duct I, which in turn causes the hood to rise and fall synchronously, thus adjusting the hood's height. Compared to existing manual height adjustment methods, this method only requires opening and closing the electric drive structure, making it not only convenient to operate but also eliminating the need for workers to climb heights, thus solving the problem of the dangers associated with such work. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the front view structure of the atomic absorption shield provided in an embodiment of this application; Figure 2 A partial front view cross-sectional structural schematic diagram of the atomic absorption shield provided in an embodiment of this application; Figure 3 A partial top view of the atomic absorption shield provided in an embodiment of this application; Figure 4 for Figure 3 A magnified structural diagram of region A; Figure 5 This is a partial three-dimensional structural diagram of the atomic absorption shield provided in an embodiment of this application.

[0015] Explanation of reference numerals in the attached drawings: 1. Cover body; 2. Ventilation duct I; 3. Ventilation duct II; 4. Corrugated telescopic tube; 5. Vertical rod; 5. Rack; 51. Plate; 511. Tooth; 512. Electric drive structure; 6. Mounting bracket; 61. Through groove; 611. Motor; 62. Gear; 63. Rotating shaft; 64. Transmission structure; 65. Mounting shaft; 651. Worm gear; 652. Worm wheel; 653. Chain drive mechanism; 654. Limiting plate; 7. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions in the embodiments of this application are described clearly and completely below. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are also within the scope of protection of this application.

[0017] like Figures 1-5 As shown: An embodiment of this application provides an atomic absorption hood, including a hood body 1. The hood body 1 has a funnel-shaped structure, and a ventilation pipe I2 is sealed to the upper end of the hood body 1. The ventilation pipe I2 is connected to a ventilation pipe II3 via a corrugated expansion pipe 4. The two ends of the corrugated expansion pipe 4 are respectively fitted onto the ventilation pipe I2 and the ventilation pipe II3, and the two ends of the corrugated expansion pipe 4 are detachably and sealed to the ventilation pipe I2 and the ventilation pipe II3 via clamps, thus achieving a good sealing effect between the ventilation pipe I2 and the ventilation pipe II3.

[0018] Inside ventilation duct I2, there are two symmetrically arranged vertical rods 5. The lower end of each rod 5 is fixed with a support, which is fixedly connected to the inner wall of ventilation duct I2. The rods 5 extend into ventilation duct II3 and slide vertically therewith, allowing the two rods 5 to move only in the vertical direction.

[0019] The ventilation duct II3 is equipped with an electric drive structure 6 that is connected to two vertical rods 5, and the electric drive structure 6 can drive the two vertical rods 5 to rise and fall synchronously.

[0020] In this embodiment, ventilation duct II3 is fixed to the top of the laboratory by a hoisting frame.

[0021] In use, the electric drive structure 6 is activated, which drives the two vertical rods 5 to raise and lower. When the two vertical rods 5 move upward, they move the ventilation pipe I2 upward, the corrugated expansion pipe 4 shortens, and the ventilation pipe I2 moves the cover 1 upward, increasing the distance between the cover 1 and the experimental table. When the two vertical rods 5 move downward, they move the ventilation pipe I2 downward, the corrugated expansion pipe 4 shortens, and the ventilation pipe I2 moves the cover 1 downward, decreasing the distance between the cover 1 and the experimental table. Therefore, compared with the existing manual height adjustment method, only the electric drive structure 6 needs to be opened and closed to raise and lower the cover 1 to adjust its height. This is not only convenient to operate, but also eliminates the need for climbing, solving the problem of the danger of workers climbing to heights.

[0022] In some embodiments of this application, the vertical rod 5 is a rack 51.

[0023] The electric drive structure 6 includes a mounting bracket 61 fixed inside the ventilation duct II 3. The mounting bracket 61 is equipped with a motor 62 and two gears 63 that mesh with two racks 51 respectively. The two gears 63 are respectively fixed with rotating shafts 64. Both ends of the rotating shafts 64 are rotatably connected to the mounting bracket 61 through bearings. The motor 62 is connected to the two gears 63 simultaneously through a self-locking transmission structure 65 and drives the two gears 63 to rotate synchronously in opposite directions.

[0024] In this embodiment, the motor 62 is a servo motor 62, and a wireless remote controller is also included. The wireless remote controller is used to control the opening, closing, forward and reverse rotation of the servo motor 62. The servo motor 62, the wireless remote controller, and the method by which the wireless remote controller controls the servo motor 62 are all existing technologies. Those skilled in the art can learn about them through common knowledge, technical manuals, or conventional experimental methods. Furthermore, those skilled in the art can flexibly select, install, and debug the circuits according to existing technologies to ensure that each component can operate normally. Therefore, no further restrictions are imposed here.

[0025] When the cover 1 is moved upward, the operator operates the remote control to make the motor 62 rotate forward. The motor 62 drives the two gears 63 to rotate synchronously in opposite directions through the transmission structure 65. Since the two racks 51 are symmetrically distributed, after the two gears 63 rotate synchronously in opposite directions, the two gears 63 drive the two racks 51 to move upward synchronously. The two racks 51 drive the cover 1 to move upward through the ventilation pipe I2. When the cover 1 moves to the required position, the motor 62 is turned off. Since the transmission structure 65 has a self-locking effect, after the motor 62 is turned off, the gears 63 are locked under the self-locking action of the transmission structure 65. At the same time, the gears 63 lock the racks 51. That is, after the motor 62 is turned off, the cover 1 can be locked.

[0026] When the cover 1 is lowered, the operator uses the remote control to reverse the motor 62. The motor 62 drives the two gears 63 to rotate synchronously in opposite directions through the transmission structure 65. The two gears 63 drive the two racks 51 to move down synchronously. The two racks 51 drive the cover 1 to move down through the ventilation pipe I2. When the cover 1 is lowered to the desired position, the motor 62 is turned off.

[0027] In some embodiments of this application, the transmission structure 65 includes a mounting shaft 651 mounted on a mounting bracket 61. Both ends of the mounting shaft 651 are rotatably connected to the mounting bracket 61 via bearings. The mounting shaft 651 is provided with two worms 652 with opposite directions of rotation. Each worm 652 meshes with a worm wheel 653 adapted to it. The two worm wheels 653 are respectively fixedly connected to two gears 63.

[0028] In this embodiment, the two worm gears 653 are respectively fixed on the two rotating shafts 64.

[0029] The motor 62 is connected to the mounting shaft 651 via a chain drive mechanism 654.

[0030] In operation, the motor 62 drives the mounting shaft 651 to rotate via the chain drive mechanism 654. The mounting shaft 651 drives the two worm gears 652 to rotate synchronously. Since the two worm gears 652 rotate in opposite directions, after rotating in the same direction with the mounting shaft 651, the two worm gears 652 drive the two worm wheels 653 to rotate in opposite directions. The two worm gears 652 then drive the two gears 63 to rotate in opposite directions via the rotating shaft 64. Because the worm wheel 653 and the worm gear 652 have a self-locking effect after meshing, and both the worm wheel 653 and the gear 63 are fixed on the rotating shaft 64, the gear 63 is locked by the self-locking action of the worm wheel 653 and the worm gear 652 after the motor 62 stops rotating.

[0031] In some embodiments of this application, the mounting frame 61 is a hollow box structure, and the gear 63, transmission structure 65, chain drive mechanism 654 and motor 62 are all disposed inside the mounting frame 61 to protect the gear 63, transmission structure 65, chain drive mechanism 654 and motor 62.

[0032] The rack 51 passes through the mounting bracket 61 and is slidably connected to the mounting bracket 61 in the vertical direction.

[0033] In some embodiments of this application, the rack 51 includes a plate 511 with a rounded rectangular cross-section, and teeth 512 are provided on one side of the plate 511.

[0034] The mounting bracket 61 has two through slots 611 that extend vertically and are adapted to the rack 51. The rack 51 passes through the through slots 611 and is slidably connected to them. The through slots 611 can limit the movement of the plate 511 in the horizontal direction. The four side walls of the plate 511, which are distributed vertically, are in contact with and slidably connected to the through slots 611, so that the plate 511 can only move in the vertical direction.

[0035] In this embodiment, by setting the plate 511 with a rounded rectangular cross-section through the rack 51, the frictional resistance generated when the plate 511 is raised and lowered can be reduced, so that the plate 511 can be raised and lowered smoothly.

[0036] In some embodiments of this application, a limiting plate 7 is fixed at the upper end of the rack 51, which can contact the upper end of the mounting bracket 61, and is used to limit the rack 51 when it moves down, so as to prevent the rack 51 from moving down too far and disengaging from the gear 63.

[0037] In some embodiments of this application, the upper end of the mounting bracket 61 is detachably fixed with a box cover by bolts, and the mounting bracket 61 is detachably fixed to the inner wall of the ventilation pipe II3 by bolts, thereby facilitating the disassembly of the mounting bracket 61 and the maintenance of the components inside the mounting bracket 61.

[0038] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. An atomic absorption shield, comprising a shield body (1), characterized in that: The upper end of the cover (1) is connected to a ventilation pipe I (2), and the ventilation pipe I (2) is connected to a ventilation pipe II (3) through a corrugated expansion pipe (4). The ventilation pipe I (2) has two symmetrical and vertically distributed vertical rods (5) fixed inside, and the vertical rods (5) extend into the ventilation pipe II (3) and slide in the vertical direction to connect with the ventilation pipe II (3); The ventilation pipe II (3) is equipped with an electric drive structure (6) connected to two vertical rods (5), and the electric drive structure (6) can drive the two vertical rods (5) to rise and fall synchronously.

2. The atomic absorption hood according to claim 1, characterized in that: The vertical rod (5) is made of rack (51); The electric drive structure (6) includes a mounting bracket (61) fixed inside the ventilation pipe II (3). The mounting bracket (61) is provided with a motor (62) and two gears (63) that mesh with two racks (51) respectively. The motor (62) is connected to the two gears (63) simultaneously through a self-locking transmission structure (65) and drives the two gears (63) to rotate synchronously in opposite directions.

3. The atomic absorption hood according to claim 2, characterized in that: The transmission structure (65) includes a mounting shaft (651) mounted on a mounting bracket (61). The mounting shaft (651) is provided with two worms (652) with opposite directions of rotation. Each worm (652) is meshed with a worm wheel (653) that is adapted to it. The two worm wheels (653) are respectively fixedly connected to two gears (63). The motor (62) is connected to the mounting shaft (651) via a chain drive mechanism (654).

4. The atomic absorption hood according to claim 3, characterized in that: The mounting frame (61) is a hollow box structure, and the gear (63), transmission structure (65), chain drive mechanism (654) and motor (62) are all located inside the mounting frame (61); The rack (51) passes through the mounting bracket (61) and is slidably connected to the mounting bracket (61) in the vertical direction.

5. The atomic absorption hood according to claim 4, characterized in that: The rack (51) includes a plate (511) with a rounded rectangular cross-section, and teeth (512) are provided on one side of the plate (511). The mounting bracket (61) has two through slots (611) that are vertically connected and adapted to the rack (51). The rack (51) passes through the through slots (611) and is slidably connected to the through slots (611). The through slots (611) can be limited in the horizontal direction with the plate (511).

6. The atomic absorption hood according to claim 5, characterized in that: The upper end of the rack (51) is fixed with a limiting plate (7) that can contact the upper end of the mounting bracket (61).

7. The atomic absorption hood according to claim 4, characterized in that: The upper end of the mounting bracket (61) is detachably fixed with a box cover, and the mounting bracket (61) is detachably fixed to the inner wall of the ventilation pipe II (3).

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