Automatic air control type ventilation cabinet

Abstract

The utility model relates to the technical field of air control type fume cupboards, in particular to an automatic air control type fume cupboard which has two different air quantity adjusting modes of lifting movement and turning opening and closing of an adjusting door and is good in practicability. Comprising a cabinet body, an adjusting door and an exhaust fan. The cabinet further comprises two screws, two threaded sleeve seats, two sliding blocks, two supporting rods and a threaded assembly, the two screws are vertically and rotatably arranged on the side wall of the cabinet body, the two threaded sleeve seats are rotatably connected with the two screws in a threaded mode, the two sliding blocks are slidably arranged on the two screws in a sleeving mode respectively, the two sliding blocks are located above the two threaded sleeve seats respectively, and the two supporting rods are connected with the threaded assembly. The two threaded rods are symmetrically arranged, the two sliding blocks are symmetrically arranged, the two sliding blocks are in threaded connection with or separated from the two threaded rods through the threaded assembly, the lower ends of the two supporting rods are rotationally connected with the two threaded sleeve bases correspondingly, and the upper ends of the two supporting rods are rotationally connected with the lower ends of the two sides of the adjusting door correspondingly. The upper ends of the two sides of the adjusting door are rotationally connected with the two sliding blocks correspondingly.

Description

Technical Field

[0001] The utility model relates to the technical field of wind-controlled fume hoods, in particular to an automatic wind-controlled fume hood. Background Art

[0002] The laboratory ventilation system is an indispensable component in the laboratory design. In order to prevent the staff in the laboratory from inhaling toxic and harmful gases, the laboratory should be equipped with good ventilation equipment. At present, the more commonly used ventilation equipment in the laboratory is mainly fume hoods. A variety of automatic air control fume hoods are disclosed in the prior art, such as the adjustable automatic air control fume hood proposed by the Chinese utility model patent with publication number CN215696635U. The automatic air control fume hood is provided with a second controller on the basis of the first controller. When it is inconvenient to raise and lower the window through the first controller, the window can be controlled by the second controller; and the linkage control between the window lifting and the air valve angle can be realized through electrical signals, so as to achieve the function of automatic air control and meet the requirements for wind speed in different scenarios.

[0003] However, the window or adjustment door of the above-mentioned existing automatic air control fume hood can only move up and down on the cabinet body, so as to adjust the distance between the window or adjustment door and the lower edge of the ventilation window, and then adjust the air volume of the exhaust. The adjustment means are relatively simple. For the smoke that can float upward, due to the lack of a cover buckle structure, the suction effect of the floating smoke is not good. Utility Model Content

[0004] In order to solve the above technical problems, the utility model provides an automatic air control fume hood with two different air volume adjustment modes of adjusting the door, namely, lifting and moving and flipping and opening and closing, and good practicality.

[0005] The utility model discloses an automatic wind control fume hood, comprising a cabinet body, an adjusting door and an exhaust fan, a ventilation window is arranged on the middle side wall of the cabinet body, the exhaust fan is installed on the cabinet body, and the air suction port of the exhaust fan is connected with the ventilation window; it also comprises two screw rods, two threaded sleeves, two sliders, two support rods and a threaded assembly, the two screw rods are respectively arranged on the side wall of the cabinet body for vertical rotation, the two screw rods are respectively located on both sides of the ventilation window of the cabinet body, the two threaded sleeves are respectively rotatably screwed with the two screw rods, the two sliders are respectively slidably sleeved on the two screw rods, the two sliders are respectively located above the two threaded sleeves, the two screws are symmetrically arranged, the two sliders are symmetrically arranged, the threaded assembly threadably connects or disengages the two sliders with the two screws, the lower ends of the two support rods are respectively rotatably connected with the two threaded sleeves, the upper ends of the two support rods are respectively rotatably connected with the lower ends of the two sides of the adjusting door, the upper ends of the two sides of the adjusting door are respectively rotatably connected with the two sliders The two screws rotate synchronously, so that the two threaded sleeves and the two sliders are synchronously raised or lowered under the action of the threads, thereby driving the adjusting door to rise and fall on the side wall of the cabinet, thereby adjusting the distance between the lower edge of the adjusting door and the lower edge of the ventilation window of the cabinet, and then adjusting the air intake. The threaded assembly disengages the two sliders from the two screws respectively, so that the two sliders will not be driven to rise and fall by the two screws. The two screws rotate synchronously, so that the two threaded sleeves are synchronously raised or lowered under the action of the threads, thereby opening or closing the lower end of the adjusting door toward the outside of the cabinet through the two support rods, thereby adjusting the opening angle of the lower end of the adjusting door, and then adjusting the air intake. After the lower end of the adjusting door is opened outward, the adjusting door covers the smoke floating upward, thereby improving the suction effect on the floating smoke, realizing two different air volume adjustment methods, and having good practicality.

[0006] Preferably, it also includes a controller, gear one and gear two. The controller is installed on the cabinet, and gear one is concentrically installed on the adjusting rotary rod of the controller. Gear one is meshed with gear two, and gear two is concentrically installed on the screw rod; when the screw rod rotates, it drives gear two to rotate, and gear two meshes to drive gear one to rotate, thereby rotating the adjusting rotary rod of the controller, and then adjusting the operating power of the exhaust fan, so as to realize the linkage between the opening size of the adjusting door and the power of the exhaust fan, that is, the larger the opening of the adjusting door is, the greater the power of the exhaust fan is, thereby ensuring that the exhaust speed of the ventilation window is stable and improving the exhaust effect.

[0007] Preferably, it also includes a cross bar, the two ends of which are respectively connected to two sliders, and the cross bar is arranged horizontally; the connection of the cross bar allows the two sliders to maintain synchronous horizontal movement, thereby improving the connection stability of the two sliders to the upper end of the adjusting door.

[0008] Preferably, the threaded assembly includes two threaded blocks, two push rods and a double-headed push cylinder, each of the two sliding blocks is provided with a socket, and the two threaded blocks are respectively slidably inserted in the sockets of the two sliding blocks, and threads are provided on the end surfaces of the two threaded blocks facing the two screw rods, and the threads match the two screw rods respectively, and the outer ends of the two push rods are respectively connected to the two threaded blocks, and the inner ends of the two push rods are respectively connected to the two piston rods of the double-headed push cylinder, and the double-headed push cylinder is installed on the cross bar; the two piston rods of the double-headed push cylinder are synchronously extended to push the two push rods and the threaded blocks outward, so that the threads of the two threaded blocks are respectively connected to the two screw threads, and then when the two screws rotate, the two threaded blocks are driven to rise and fall through the action of the threads, and the two threaded blocks drive the two sliders to rise and fall, and the two piston rods of the double-headed push cylinder are synchronously contracted to pull the two push rods and the two threaded blocks inward, so that the threads of the two threaded blocks are respectively disengaged from the two screws, so that when the two screws rotate, the two sliders will not rise and fall. The structure is simple and practical.

[0009] Preferably, it also includes two wedge blocks and two plug rods, the two wedge blocks are respectively installed on the two push rods, the two plug rods are slidably inserted on the cross bar, the ends of the two plug rods are in contact with the outer wall of the cabinet, the wedge blocks and the plug rods are in sliding contact with the opposite surfaces, the wedge blocks and the plug rods are inclined, and the opposite surfaces are closer to the push rod than the end away from the double-headed push cylinder. When the two piston rods of the double-headed push cylinder are extended to push the two push rods outward so that the two threaded blocks are threadedly connected to the two screws, the two push rods respectively drive the two wedge blocks to move outward, so that the relative surfaces of the two wedge blocks and the two plug rods are The opposite sides are staggered and moved away from each other, so that the ends of the two plug rods are disengaged from the cabinet body, so that the cross bar and the two sliding blocks can be raised and lowered under the drive of the two screw rods. When the two piston rods of the double-head push cylinder contract and pull the two push rods inward to disengage the two threaded blocks from the two screw rods, the two push rods respectively drive the two wedge blocks to move inward, so that the relative surfaces of the two wedge blocks and the two plug rods are staggered and aligned, so that the ends of the two plug rods are in contact and pressed against the cabinet body, thereby locking the cross bar and the two sliding blocks to the cabinet body, so that the upper end of the adjustable door remains stable, and the lower end of the adjustable door is more convenient to flip open, which has good practicality.

[0010] Preferably, it also includes a motor, a driving wheel, two driven wheels and two transmission belts. The motor is installed on the cabinet, the driving wheel is concentrically installed on the output shaft of the motor, the two driven wheels are concentrically installed on the two screws respectively, the inner ends of the two transmission belts are fitted with the driving wheel, and the outer ends of the two transmission belts are respectively fitted with the two driven wheels; the motor drives the driving wheel to rotate, and the driving wheel drives the two driven wheels to rotate synchronously through the two transmission belts, and the two driven wheels synchronously drive the two screws to rotate, thereby realizing synchronous driving of the two screws, and the technology is mature and reliable.

[0011] Preferably, it also includes an air valve, which is installed on the air outlet pipe of the exhaust fan; the degree of opening of the air outlet pipe of the exhaust fan is adjusted by the air valve, thereby adjusting the exhaust effect of the exhaust fan.

[0012] Compared with the prior art, the beneficial effects of the utility model are as follows: when working, the threaded components of the two sliders are respectively threadedly connected with the two screw rods, and the two screw rods rotate synchronously, so that the two threaded sleeves and the two sliders are synchronously raised or lowered under the action of the threads, thereby driving the adjusting door to rise and fall on the side wall of the cabinet, thereby adjusting the distance between the lower edge of the adjusting door and the lower edge of the ventilation window of the cabinet, and then adjusting the air intake. The threaded components separate the two sliders from the two screw rods respectively, so that the two sliders will not be driven to rise and fall by the two screw rods. The two screws rotate synchronously, so that the two threaded sleeves are synchronously raised or lowered under the action of the threads, thereby the lower end of the adjusting door is opened or closed toward the outside of the cabinet through the two support rods, thereby adjusting the opening angle of the lower end of the adjusting door, and then adjusting the air intake. After the lower end of the adjusting door is opened outward, the adjusting door covers the smoke floating upward, thereby improving the suction effect on the floating smoke, realizing two different air volume adjustment methods, and having good practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of the utility model;

[0014] Figure 2 It is a schematic diagram of the side section structure of the utility model;

[0015] Figure 3 It is a structural schematic diagram of the structure including the adjusting door, the screw rod, the threaded sleeve, the slider, the support rod, the controller and the threaded assembly;

[0016] Figure 4 It is a structural schematic diagram of the structure of the screw, threaded sleeve, slider and threaded assembly;

[0017] Figure 5 yes Figure 1 A schematic diagram of the local enlarged structure at point A in the middle;

[0018] Figure 6 yes Figure 4 Schematic diagram of the local enlarged structure at point B in the middle.

[0019] Markings in the attached figure: 1. cabinet; 2. adjusting door; 3. exhaust fan; 4. screw; 5. threaded sleeve; 6. slider; 7. support rod; 8. controller; 9. gear one; 10. gear two; 11. cross bar; 12. threaded block; 13. push rod; 14. double-head push cylinder; 15. wedge block; 16. plug rod; 17. motor; 18. driving wheel; 19. driven wheel; 20. transmission belt; 21. air valve. DETAILED DESCRIPTION

[0020] In order to facilitate the understanding of the utility model, the utility model will be described more comprehensively below with reference to the relevant drawings. The utility model can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the utility model more thorough and comprehensive.

[0021] Example 1

[0022] like Figures 1 to 3 As shown, an automatic wind control fume hood includes a cabinet 1, an adjustment door 2 and an exhaust fan 3. A ventilation window is arranged on the middle side wall of the cabinet 1. The exhaust fan 3 is installed on the cabinet 1, and the air suction port of the exhaust fan 3 is connected to the ventilation window; it also includes two screws 4, two threaded sleeves 5, two sliders 6, two support rods 7 and a threaded assembly. The two screws 4 are respectively arranged vertically and rotatably on the side walls of the cabinet 1. The two screws 4 are respectively located on both sides of the ventilation window of the cabinet 1. The two threaded sleeves 5 are respectively rotatably screwed with the two screws 4. The two sliders 6 are respectively slidably sleeved on the two screws 4. The two sliders 6 are respectively located above the two threaded sleeves 5. The two screws 4 are symmetrically arranged, and the two sliders 6 are symmetrically arranged. The threaded assembly threadably connects or disengages the two sliders 6 from the two screws 4, and the lower ends of the two support rods 7 are respectively rotatably screwed with the two threaded sleeves 5 The cabinet 1 is connected to the upper ends of the two support rods 7, and the upper ends of the two sides of the adjusting door 2 are respectively rotatably connected to the lower ends of the two sides of the adjusting door 2, and the upper ends of the two sides of the adjusting door 2 are respectively rotatably connected to the two sliders 6; it also includes a controller 8, a gear 1 9 and a gear 2 10, the controller 8 is installed on the cabinet 1, and the gear 1 9 is concentrically installed on the adjusting rotary rod of the controller 8, the gear 1 9 is meshed with the gear 2 10, and the gear 2 10 is concentrically installed on the screw 4; it also includes a motor 17, a driving wheel 18, two driven wheels 19 and two transmission belts 20, the motor 17 is installed on the cabinet 1, the driving wheel 18 is concentrically installed on the output shaft of the motor 17, the two driven wheels 19 are respectively concentrically installed on the two screws 4, the inner ends of the two transmission belts 20 are fitted with the driving wheel 18, and the outer ends of the two transmission belts 20 are respectively fitted with the two driven wheels 19, and it also includes an air valve 21, which is installed on the air outlet pipe of the exhaust fan 3.

[0023] During operation, the threaded components of the two sliders 6 are respectively threadedly connected with the two screw rods 4, the motor 17 drives the driving wheel 18 to rotate, and the driving wheel 18 drives the two driven wheels 19 to rotate synchronously through the two transmission belts 20, and the two driven wheels 19 synchronously drive the two screw rods 4 to rotate, thereby realizing the synchronous driving of the two screw rods 4. The two screw rods 4 rotate synchronously, so that the two threaded sleeves 5 and the two sliders 6 are synchronously raised or lowered under the action of the threads, thereby driving the adjusting door 2 to rise and fall on the side wall of the cabinet 1, thereby adjusting the distance between the lower edge of the adjusting door 2 and the lower edge of the ventilation window of the cabinet 1, and then adjusting the air intake. The threaded components separate the two sliders 6 from the two screw rods 4 respectively, so that the two sliders 6 will not be driven to rise and fall by the two screw rods 4, and the two screw rods 4 rotate synchronously, so that the two threaded sleeves 5 are synchronously raised or lowered under the action of the threads, thereby adjusting the air intake. The lower end of the adjusting door 2 is opened or closed toward the outside of the cabinet 1 by two support rods 7, thereby adjusting the opening angle of the lower end of the adjusting door 2, thereby adjusting the air intake volume. After the lower end of the adjusting door 2 is opened outward, the adjusting door 2 covers the smoke floating upward, thereby improving the suction effect on the floating smoke, and realizing two different air volume adjustment methods. When the screw 4 rotates, it drives the gear 2 10 to rotate, and the gear 2 10 engages to drive the gear 1 9 to rotate, thereby rotating the adjusting rotary rod of the controller 8, thereby adjusting the operating power of the exhaust fan 3, and realizing the linkage between the opening size of the adjusting door 2 and the power of the exhaust fan 3, that is, the larger the opening of the adjusting door 2 is, the greater the power of the exhaust fan 3 is, ensuring that the exhaust speed of the ventilation window is stable, improving the exhaust effect, and adjusting the degree of opening of the air outlet pipe of the exhaust fan 3 by the air valve 21, thereby adjusting the exhaust effect of the exhaust fan 3.

[0024] Example 2

[0025] like Figures 4 to 6 As shown, on the basis of Example 1, it also includes a cross bar 11, the two ends of the cross bar 11 are respectively connected to the two sliders 6, and the cross bar 11 is arranged horizontally; the threaded assembly includes two threaded blocks 12, two push rods 13 and a double-head push cylinder 14, and the two sliders 6 are provided with sockets, and the two threaded blocks 12 are respectively slidably inserted in the sockets of the two sliders 6, and the two threaded blocks 12 are respectively provided with threads on the end faces facing the two screw rods 4, and the threads are respectively matched with the two screw rods 4, and the outer ends of the two push rods 13 are respectively connected to the two threaded blocks 12, and the two push rods 13 are respectively connected to the two threaded blocks 12. The inner ends are respectively connected to the two piston rods of the double-headed push cylinder 14, and the double-headed push cylinder 14 is installed on the cross bar 11; it also includes two wedge blocks 15 and two plug rods 16, the two wedge blocks 15 are respectively installed on the two push rods 13, the two plug rods 16 are slidably inserted on the cross bar 11, and the ends of the two plug rods 16 are in contact with the outer wall of the cabinet 1, and the opposing surfaces of the wedge blocks 15 and the plug rods 16 are in sliding contact. The opposing surfaces of the wedge blocks 15 and the plug rods 16 are inclined, and the end of the opposing surface close to the double-headed push cylinder 14 is closer to the push rod 13 than the end away from the double-headed push cylinder 14.

[0026] The connection of the cross bar 11 enables the two sliders 6 to maintain synchronous horizontal movement, thereby improving the connection stability of the two sliders 6 to the upper end of the adjusting door 2. The two piston rods of the double-headed push cylinder 14 are synchronously extended to push the two push rods 13 and the threaded block 12 outward, so that the threads of the two threaded blocks 12 are respectively threadedly connected with the two screw rods 4, so that when the two screw rods 4 rotate, the two threaded blocks 12 are driven to rise and fall through the action of the threads, and the two threaded blocks 12 drive the two sliders 6 to rise and fall. The two piston rods of the double-headed push cylinder 14 are synchronously contracted to pull the two push rods 13 and the two threaded blocks 12 inward, so that the threads of the two threaded blocks 12 are respectively disengaged from the two screw rods 4, so that when the two screw rods 4 rotate, the two sliders 6 will not rise and fall. When the two piston rods of the double-headed push cylinder 14 are extended to push the two push rods 13 outward, the two threaded blocks 1 2 is threadedly connected with the two screw rods 4, the two push rods 13 respectively drive the two wedge blocks 15 to move outward, so that the opposite surfaces of the two wedge blocks 15 and the two plug rods 16 are staggered and moved away, so that the ends of the two plug rods 16 are separated from the cabinet body 1, so that the cross bar 11 and the two sliders 6 can be lifted and lowered under the drive of the two screw rods 4. When the two piston rods of the double-head push cylinder 14 are contracted to pull the two push rods 13 inward to separate the two threaded blocks 12 from the two screw rods 4, the two push rods 13 respectively drive the two wedge blocks 15 to move inward, so that the opposite surfaces of the two wedge blocks 15 and the two plug rods 16 are staggered and aligned, so that the ends of the two plug rods 16 are in contact and pressed with the cabinet body 1, thereby locking the cross bar 11 and the two sliders 6 on the cabinet body 1, so that the upper end of the adjustment door 2 remains stable and the lower end of the adjustment door 2 is more convenient to flip open.

[0027] like Figures 1 to 6As shown, an automatic wind control fume hood of the utility model, when working, firstly, the two piston rods of the double-headed push cylinder 14 extend to push the two push rods 13 outwards so that the two threaded blocks 12 are threadedly connected with the two screw rods 4, and the two push rods 13 respectively drive the two wedge blocks 15 to move outwards, so that the opposite surfaces of the two wedge blocks 15 and the two plug rods 16 are staggered and moved away, so that the ends of the two plug rods 16 are separated from the cabinet body 1, and then the two screw rods 4 rotate synchronously, so that the two threaded sleeves 5 and the two sliders 6 are synchronously raised or lowered under the action of the threads, thereby driving the adjusting door 2 to rise and fall on the side wall of the cabinet body 1, thereby adjusting the distance between the lower edge of the adjusting door 2 and the lower edge of the ventilation window of the cabinet body 1, and then adjusting the air intake, and then the two piston rods of the double-headed push cylinder 14 contract to pull the two push rods 13 inwards so that the two threaded blocks 12 are separated from the two screw rods 4, and the two push rods 13 respectively drive the two wedge blocks 15 to move outwards, so that the opposite surfaces of the two wedge blocks 15 and the two plug rods 16 are staggered and moved away, so that the ends of the two plug rods 16 are separated from the cabinet body 1, and then the two screw rods 4 rotate synchronously, so that the two threaded sleeves 5 and the two sliders 6 are synchronously raised or lowered under the action of the threads, thereby driving the adjusting door 2 to rise and fall on the side wall of the cabinet body 1, thereby adjusting the distance between the lower edge of the adjusting door 2 and the lower edge of the ventilation window of the cabinet body 1, and then adjusting the air intake. The block 15 moves inwardly, so that the opposite surfaces of the two wedge blocks 15 and the two plug rods 16 are staggered and aligned, so that the ends of the two plug rods 16 are in contact and pressed against the cabinet body 1, thereby locking the cross bar 11 and the two sliders 6 on the cabinet body 1, and the two screw rods 4 rotate synchronously, so that the two threaded sleeves 5 are synchronously raised or lowered under the action of the threads, so that the lower end of the adjusting door 2 is opened or closed to the outside of the cabinet body 1 through the two support rods 7, thereby adjusting the opening angle of the lower end of the adjusting door 2, and then adjusting the air intake. After the lower end of the adjusting door 2 is opened outward, the adjusting door 2 covers the upward floating smoke, thereby improving the suction effect of the floating smoke. Finally, when the screw rod 4 rotates, it drives the gear 2 10 to rotate, and the gear 2 10 engages to drive the gear 1 9 to rotate, thereby rotating the adjusting rotary rod of the controller 8, and then adjusting the operating power of the exhaust fan 3, so as to realize the linkage between the opening size of the adjusting door 2 and the power of the exhaust fan 3.

[0028] The main functions achieved by this utility model are:

[0029] 1. It has two different air volume adjustment modes: door lifting and movement and flip opening and closing, which is practical;

[0030] 2. The opening size of the regulating door 2 is linked to the power of the exhaust fan 3, that is, the larger the opening of the regulating door 2 is, the greater the power of the exhaust fan 3 is, thereby ensuring that the exhaust speed of the ventilation window is stable and improving the exhaust effect.

[0031] The utility model is an automatic air control fume hood, and its installation method, connection method or setting method are all common mechanical methods, and can be implemented as long as it can achieve its beneficial effects; the utility model is an automatic air control fume hood. The cabinet body 1, the adjustment door 2, the exhaust fan 3, the screw 4, the threaded sleeve 5, the controller 8, the gear 1 9, the gear 2 10, the threaded block 12, the push rod 13, the double-head push cylinder 14, the motor 17, the driving wheel 18, the driven wheel 19, the transmission belt 20, and the air valve 21 are purchased on the market. The technicians in this industry only need to install and operate it according to the accompanying instruction manual, and the technicians in this field do not need to pay creative labor.

[0032] All technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0033] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. An automatic air control fume hood, comprising a cabinet body (1), an adjustable door (2) and an exhaust fan (3), a ventilation window is arranged on the middle side wall of the cabinet body (1), the exhaust fan (3) is installed on the cabinet body (1), and the air suction port of the exhaust fan (3) is connected to the ventilation window; characterized in that: The cabinet also comprises two screw rods (4), two threaded sleeves (5), two sliders (6), two support rods (7) and a threaded assembly. The two screw rods (4) are respectively arranged vertically and rotatably on the side walls of the cabinet (1). The two screw rods (4) are respectively located on both sides of the ventilation window of the cabinet (1). The two threaded sleeves (5) are respectively rotatably screwed with the two screw rods (4). The two sliders (6) are respectively slidably sleeved on the two screw rods (4). The two sliders (6) are respectively located above the two threaded sleeves (5). The two screw rods (4) are symmetrically arranged. The two sliders (6) are symmetrically arranged. The threaded assembly threadably connects or disconnects the two sliders (6) with the two screw rods (4). The lower ends of the two support rods (7) are respectively rotatably connected with the two threaded sleeves (5). The upper ends of the two support rods (7) are respectively rotatably connected with the lower ends of the two sides of the adjustment door (2). The upper ends of the two sides of the adjustment door (2) are respectively rotatably connected with the two sliders (6).

2. An automatic air control fume hood according to claim 1, characterized in that: The invention also comprises a controller (8), a gear 1 (9) and a gear 2 (10). The controller (8) is mounted on the cabinet (1). The gear 1 (9) is coaxially mounted on the adjusting rotating rod of the controller (8). The gear 1 (9) is meshed with the gear 2 (10). The gear 2 (10) is coaxially mounted on the screw rod (4).

3. The automatic air control fume hood according to claim 1, characterized in that: It also comprises a cross bar (11), the two ends of which are respectively connected to two sliders (6), and the cross bar (11) is arranged horizontally.

4. An automatic air control fume hood as claimed in claim 3, characterized in that: The threaded assembly comprises two threaded blocks (12), two push rods (13) and a double-headed push cylinder (14). The two sliders (6) are both provided with insertion holes. The two threaded blocks (12) are respectively slidably inserted into the insertion holes of the two sliders (6). The two threaded blocks (12) are both provided with threads on the end surfaces facing the two screw rods (4). The threads are respectively matched with the two screw rods (4). The outer ends of the two push rods (13) are respectively connected with the two threaded blocks (12). The inner ends of the two push rods (13) are respectively connected with the two piston rods of the double-headed push cylinder (14). The double-headed push cylinder (14) is installed on the cross bar (11).

5. An automatic air control fume hood as claimed in claim 4, characterized in that: It also includes two wedge blocks (15) and two insertion rods (16), the two wedge blocks (15) are respectively mounted on the two push rods (13), the two insertion rods (16) are slidably inserted on the cross bar (11), the ends of the two insertion rods (16) are in contact with the outer wall of the cabinet (1), the relative surfaces of the wedge blocks (15) and the insertion rods (16) are in sliding contact, the relative surfaces of the wedge blocks (15) and the insertion rods (16) are inclined, and the end of the relative surface close to the double-head push cylinder (14) is closer to the push rod (13) than the end away from the double-head push cylinder (14).

6. The automatic air control fume hood according to claim 1, characterized in that: The invention also comprises a motor (17), a driving wheel (18), two driven wheels (19) and two transmission belts (20), wherein the motor (17) is mounted on the cabinet (1), the driving wheel (18) is coaxially mounted on the output shaft of the motor (17), the two driven wheels (19) are coaxially mounted on two screw rods (4), the inner ends of the two transmission belts (20) are fitted with the driving wheel (18), and the outer ends of the two transmission belts (20) are fitted with the two driven wheels (19) respectively.

7. The automatic air control fume hood according to claim 1, characterized in that: It also includes an air valve (21), which is installed on the air outlet pipe of the exhaust fan (3).

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