A chemical laboratory air quality monitoring device

Abstract

The present invention belongs to the technical field of air quality monitoring, and specifically is an air quality monitoring device for a chemical laboratory; it comprises an instrument, and an air duct is arranged on the side of the instrument; a fitting locking unit is arranged on the instrument; the fitting locking unit comprises a filter box, and the filter box is installed and / or disassembled by operating the fitting locking unit; the fitting locking unit also comprises two locking plugs, and the two locking plugs are symmetrically arranged along the transverse center axis of the instrument; positioning cross plates are installed on the opposite surfaces of the two locking plugs; the fitting locking unit is used to fix the filter box at the current position and complete the installation operation of the filter box, so that the air duct on the instrument can avoid the accumulation of pollutants such as impurities, dust or particulate matter in the air entering the instrument and causing blockage when in use, thereby improving the accuracy of the monitoring results of the device and reducing the limitations of the device when in use.

Description

Technical Field

[0001] The invention belongs to the technical field of air quality monitoring, and in particular relates to an air quality monitoring device for a chemical laboratory. Background Art

[0002] Chemical laboratories are important places that provide conditions for chemical experiments and conduct scientific research. Since experimental gas leakage often occurs during chemical experiments, it is necessary to conduct long-term monitoring of the gas in chemical laboratories to avoid experimental gas leakage.

[0003] In order to improve the measurement accuracy and response speed of the device, the existing chemical laboratory air quality monitoring device usually uses exhaust technology to suck the surrounding gas into the box for monitoring when in use, so as to detect whether the experimental gas in the laboratory is leaking. However, in actual use, dust, particulate matter or other pollutants in the air will enter the monitoring box with the inhalation of the gas, causing accumulation in the sensor or the internal channel, causing blockage, thereby making the device unable to correctly detect the air quality in the laboratory, reducing the accuracy of the device's monitoring results, making the device more limited when in use, thereby limiting the use effect of the device. Summary of the invention

[0004] In view of the above situation, in order to overcome the defects of the prior art, the present invention provides a chemical laboratory air quality monitoring device, which effectively solves the problems in the above background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a chemical laboratory air quality monitoring device, comprising an instrument, a side of which is provided with an air duct; the instrument is provided with a fitting locking unit; the fitting locking unit comprises a filter box, and the filter box is installed and / or removed by operating the fitting locking unit; the fitting locking unit also comprises two locking plugs, and the two locking plugs are symmetrically arranged along the transverse center axis of the instrument; positioning cross plates are installed on the opposite surfaces of the two locking plugs, and a pull ring is installed on the side of the positioning cross plate away from the instrument; positioning cylinders are symmetrically arranged on the facing surfaces of the two positioning cross plates, and positioning limit plates are installed on the end points of several positioning cylinders; a retaining round seat is also installed on a positioning limit plate on the bottom surface of the instrument, and a pressurized anti-sway mechanism is provided on the retaining round seat, and the pressurized anti-sway mechanism is used to prevent the filter box from shaking when in use.

[0006] Preferably, positioning square grooves are symmetrically arranged on the sides of the instrument; positioning blocks of the same size and number as the positioning square grooves are arranged on the side of the filter box close to the instrument, and the positioning square grooves are located on the moving path of the positioning blocks; penetrating locking slots are arranged on the sides of the positioning blocks, and the locking slots are located on the moving path of the locking blocks; a fitting square plate is slidably arranged in the positioning square groove, and the fitting square plate is located on the moving path of the positioning block.

[0007] Preferably, a plurality of fitting springs are arranged in the positioning square groove, one end of the fitting spring is fixedly connected to the fitting square plate, and the other end is fixedly connected to the inner bottom surface of the positioning square groove; a plurality of positioning bases are slidably arranged on the positioning cylinders, and a plurality of positioning bases are fixedly arranged on the instrument; a positioning spring is sleeved on the positioning cylinder, one end of the positioning spring is fixedly connected to the positioning limit plate, and the other end is fixedly connected to the positioning base.

[0008] Preferably, the pressurized anti-sway mechanism includes a fixed pulley and a cable; auxiliary substrates are installed on both sides of the fixed pulley, and the auxiliary substrates are fixedly arranged on the bottom surface of the instrument; one end of the cable is connected to the retaining round seat, and the other end passes around the fixed pulley and is connected to a winding drum, one side of the winding drum is provided with an auxiliary circular groove, and the other side is provided with a rotating shaft, the rotating shaft passes through the auxiliary substrate and is connected to a rotating bevel gear, the rotating bevel gear is meshed with a driving bevel gear, and a double-acting dust scraping assembly is also provided on the driving bevel gear; a clockwork spring is also installed on the rotating shaft, and the end point of the clockwork spring is connected to the auxiliary substrate.

[0009] Preferably, a locking direction controller is provided on the auxiliary circular groove; the locking direction controller includes a driving shaft, one end of which is arranged in the auxiliary circular groove, and the other end passes through the auxiliary base plate and is connected to a driving disc, a guide column is installed on the side of the driving disc, a guide cross block is slidably provided on the guide column, guide square plates are installed on both sides of the guide cross block, guide sliding columns are slidably provided on the guide square plates, and a plurality of guide sliding columns are fixedly provided on the bottom surface of the instrument; L-shaped square rods are installed on the sides of the two guide square plates, and the two L-shaped square rods are commonly connected to a pressure square plate.

[0010] Preferably, the double-acting scraper assembly includes a displacement screw arranged on the driving bevel gear, L-shaped bases are installed at both ends of the displacement screw, and the two L-shaped bases are arranged on the auxiliary base plate; displacement blocks are symmetrically arranged on the displacement screw, and limiting square plates are symmetrically arranged on the displacement blocks, a displacement cylinder is fixedly installed on the limiting square plate, a displacement base is slidably arranged on the displacement cylinder, and the displacement base is arranged on the L-shaped base.

[0011] Preferably, a driving slide rail is installed on the side of the displacement block away from the L-shaped base, a driving slider is slidably arranged on the driving slide rail, a U-shaped square rod is installed on the side of the driving slider, the opening direction of the U-shaped square rod is facing the filter box and a scraper is also installed on the end point, and the sharp part of the scraper is located on the surface of the filter box; the end point where the U-shaped square rod is connected to the scraper is retractable.

[0012] Preferably, a pressure storage box is slidably arranged on the pressure-applying square plate, and the pressure storage box is fixedly arranged on the bottom surface of the instrument; a ventilation valve is arranged on the side of the pressure storage box; air outlet valves are installed on both sides of the pressure storage box, and bent air pipes are installed on the air outlet valves, and the two bent air pipes are commonly connected to a rubber airbag, and one side of the rubber airbag is fixedly arranged on the side of the instrument; the four sides of the filter box are located on the moving path of the inner wall of the rubber airbag.

[0013] Preferably, the displacement screw is threadedly connected to the two displacement blocks, and the threads on both ends of the displacement screw are oppositely arranged.

[0014] Preferably, the locking direction controller includes a plurality of locking grooves arranged on the outer side wall of the driving shaft; the inner side wall of the auxiliary circular groove is provided with a stop bevel groove having the same number as the locking grooves; a stop bevel block is slidably arranged in the locking groove, the stop bevel block and the stop bevel groove cooperate with each other, and the stop bevel groove is located on the moving path of the stop bevel block; the locking groove is also provided with a locking spring, one end of the locking spring is fixedly connected to the stop bevel block, and the other end is fixedly connected to the inner bottom surface of the locking groove.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] (1) Loosen the pull ring, and the positioning spring is reset to drive the positioning horizontal plate to reset and move, so that the locking plug on it enters the instrument and connects with the locking slot, thereby limiting the positioning block and fixing the filter box on it at the current position, thereby completing the installation operation of the filter box, so that the air duct on the instrument can avoid the accumulation of pollutants such as impurities, dust or particles in the air entering the instrument when in use, causing blockage. By setting a certain filter box, the impurities attached to the air can be filtered when the gas enters the instrument, and different degrees of filtering effects can be achieved by installing different types of filter boxes, thereby reducing the limitations of the device when in use, so that the device can correctly monitor the air quality in the laboratory, improve the accuracy of the monitoring results of the device, and thus improve the use effect of the device;

[0017] (2) When the inclined surfaces on the stop bevel groove and the stop bevel block are in contact, the stop bevel block moves within the locking groove, so that the locking spring is in a buffering state. When the inclined surfaces of the two are not in contact, the stop bevel block is reset and moved by the resetting of the locking spring. Since the rotation of the winding drum is continuous, the stop bevel block moves back and forth in the locking groove, so that the locking spring is constantly in a buffering and resetting state, and then the driving shaft cannot rotate. When the device completes the installation operation of the filter box and releases the pull ring, the winding drum is The reset rotation makes the oblique groove and the straight surface on the oblique block contact each other, so that the locking spring cannot buffer and move, which is equivalent to clamping the driving shaft at the auxiliary circular groove in the winding drum, thereby driving the driving disc to rotate so that the pressurized anti-sway mechanism can be used, so that the driving disc can only rotate in one direction, avoiding the rubber airbag from expanding due to the rotation of the driving disc when the device is installed on the filter box, thereby affecting the installation operation of the filter box, reducing the limitations of the device when in use, and improving the effect of the device when in use;

[0018] (3) The external gas enters the pressure storage box through the vent valve, and the gas enters the rubber airbag through the next reciprocating movement of the pressure-applying square plate, causing the rubber airbag to expand. The inner wall of the expanded rubber airbag contacts the four sides of the installed filter box, further limiting the filter box and preventing it from shaking or dislocating during use, thereby improving the stability of the filter box during use. Since the contact surface between the rubber airbag and the filter box is made of rubber, the friction of the contact with the filter box is increased. The rubber airbag also strengthens the sealing and strength of the contact between the filter box and the side of the instrument, thereby preventing the filter box from shaking during use or the two from being in a non-fitting state, resulting in a gap in the connection between the filter box and the instrument, thereby preventing impurities mixed in the external gas from entering the instrument through the gap, thereby improving the monitoring effect of the device and further reducing the limitations of the device during use;

[0019] (4) After the positioning block on the filter box is limited to the current position and loses the force applied to the filter box, the positioning spring in the buffer state cannot be reset, and the elastic force generated acts on the positioning block, thereby strengthening the contact strength between the locking block and the locking slot, so that the friction between the two is increased, avoiding the locking block from being dislocated or moved due to non-human factors during use, thereby improving the use effect of the device; at the same time, when the filter box needs to be maintained or replaced, it is only necessary to pull the pull ring outward to make the locking block on the positioning horizontal plate no longer connected to the locking slot, thereby releasing the limit setting of the positioning block. Since the positioning spring is no longer limited, the filter box can be ejected by resetting the positioning spring, thereby completing the removal operation of the filter box, making the installation and removal of the filter box convenient and quick, and can be completed without the help of any tools, reducing the limitations of the device during use, thereby facilitating operators to use different models of filter boxes or facilitate maintenance on them;

[0020] (5) The two scrapers are reset and moved toward each other so that they move to the outer surface of the filter box. Since the end point where the U-shaped square rod is connected to the scraper is retractable, the distance between the scraper and the filter box can be adjusted, which not only makes the cleaning intensity of the scraper on the filter box controllable, but also allows the staff to adjust the force applied by the scraper on the surface of the filter box in a timely manner according to the different viscosity of the impurities, so as to avoid the scraper from contacting the filter box with insufficient force, resulting in poor cleaning effect, thereby improving the use effect of the device, and at the same time limiting the installation position of the filter box to avoid dislocation or displacement during use; at the same time, during use, the instrument can operate the drive slider (with a built-in drive source, not shown in the figure) to make it slide on the drive slide rail, thereby driving the scraper to move back and forth on the surface of the filter box, so that the instrument can scrape off impurities or particles adhered to the surface of the filter box during use, thereby avoiding the long use period of the instrument resulting in more impurities adsorbed on the surface of the filter box, resulting in its blockage, which reduces the use effect of the air duct on the instrument, thereby improving the monitoring efficiency of the device and avoiding more restrictions on the device during use;

[0021] (6) Since the rubber airbag is filled with gas, it is in an elastic state. When the filter box is shaken during use, the impact force generated by the shaking will be transmitted to the rubber airbag, compressing the gas inside it. The cushioning property of the rubber airbag can reduce the impact force, thereby preventing the shaking of the filter box during use from affecting the device, improving the stability of the filter box, and at the same time improving the use effect of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0023] In the attached picture:

[0024] Figure 1 This is one of the overall structural schematic diagrams of the present invention;

[0025] Figure 2 This is an exploded view of the filter box of the present invention;

[0026] Figure 3 This is a schematic diagram of the U-shaped square rod structure of the present invention;

[0027] Figure 4 This is a schematic diagram of the guide cross block structure of the present invention;

[0028] Figure 5 It is a cross-sectional view of the rubber airbag of the present invention;

[0029] Figure 6 This is the second schematic diagram of the overall structure of the present invention;

[0030] Figure 7 This is a schematic diagram of the displacement block structure of the present invention;

[0031] Figure 8 This is a schematic diagram of the locking plug structure of the present invention;

[0032] Fig. 9 It is a schematic diagram of the structure of the guide column of the present invention;

[0033] Fig.10 This is an exploded view of the locking direction control device of the present invention;

[0034] Fig.11 It is a schematic diagram of the winding drum structure of the present invention;

[0035] Fig.12 This is a schematic diagram of the structure of the pressure storage box of the present invention;

[0036] In the figure: 1, instrument; 2, filter box; 3, locking plug; 4, positioning horizontal plate; 5, pull ring; 6, positioning cylinder; 7, positioning limit plate; 8, retaining round seat; 9, positioning square groove; 10, positioning block; 11, locking slot; 12, fitting square plate; 13, fitting spring; 14, positioning base; 15, positioning spring; 16, fixed pulley; 17, cable; 18, auxiliary base plate; 19, winding drum; 20, auxiliary round groove; 21, rotating shaft; 22, rotating bevel gear; 23, driving bevel gear; 24, spring spring; 25, driving shaft; 26, driving disc; 27. Guide column; 28. Guide cross block; 29. ​​Guide square plate; 30. Guide slide column; 31. L-shaped square rod; 32. Pressure square plate; 33. Displacement screw; 34. L-shaped base; 35. Displacement square block; 36. Limiting square plate; 37. Displacement cylinder; 38. Displacement base; 39. Drive slide rail; 40. Drive slider; 41. U-shaped square rod; 42. Scraper; 43. Pressure storage box; 44. Ventilation valve; 45. Exhaust valve; 46. Bending air pipe; 47. Rubber airbag; 48. Locking slide groove; 49. Check bevel groove; 50. Check bevel block; 51. Locking spring. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0038] Example, by Figures 1 to 12The present invention includes an instrument 1, on the side of which an air duct is provided; the instrument 1 is provided with a fitting locking unit; the fitting locking unit includes a filter box 2, and the filter box 2 is installed and / or removed by operating the fitting locking unit; the fitting locking unit also includes two locking plugs 3, and the two locking plugs 3 are symmetrically arranged along the transverse center axis of the instrument 1; positioning cross plates 4 are installed on the opposite surfaces of the two locking plugs 3, and a pull ring 5 is installed on the side of the positioning cross plate 4 away from the instrument 1; positioning cylinders 6 are symmetrically arranged on the facing surfaces of the two positioning cross plates 4, and positioning limit plates 7 are installed on the end points of several positioning cylinders 6; a retaining round seat 8 is also installed on a positioning limit plate 7 on the bottom surface of the instrument 1, and a pressurized anti-sway mechanism is provided on the retaining round seat 8, and the pressurized anti-sway mechanism is used to prevent the filter box 2 from shaking when in use; positioning square grooves are symmetrically arranged on the sides of the instrument 1 9; A positioning block 10 of the same size and number as the positioning square groove 9 is provided on the side of the filtering box 2 close to the instrument 1, and the positioning square groove 9 is located on the moving path of the positioning block 10; a penetrating locking slot 11 is provided on the side of the positioning block 10, and the locking slot 11 is located on the moving path of the locking plug 3; a fitting square plate 12 is slidably provided in the positioning square groove 9, and the fitting square plate 12 is located on the moving path of the positioning block 10; a plurality of fitting springs 13 are provided in the positioning square groove 9, one end of the fitting spring 13 is fixedly connected to the fitting square plate 12, and the other end is fixedly connected to the inner bottom surface of the positioning square groove 9; a plurality of positioning bases 14 are slidably provided on the positioning cylinders 6, and a plurality of positioning bases 14 are fixedly provided on the instrument 1; a positioning spring 15 is sleeved on the positioning cylinder 6, one end of the positioning spring 15 is fixedly connected to the positioning limit plate 7, and the other end is fixedly connected to the positioning base 14;

[0039] When the device is used to monitor the gas in the chemical laboratory, after the instrument 1 is placed in the working area, the surrounding gas can be brought into the instrument 1 through the built-in air duct, and the experimental gas in the range can be monitored by the built-in sensor, etc. Whether it leaks; in the specific use process, by pulling the pull ring 5 outward, the positioning horizontal plate 4 on it is moved to the upper limit on the positioning base 14 through the positioning cylinder 6, so that the positioning spring 15 is in a buffering state, and then the locking plug 3 on the positioning horizontal plate 4 is separated from the instrument 1, so that the locking plug 3 is no longer located in the positioning square groove 9. At this time, the filter box 2 can be installed by aligning the positioning block 10 on the filter box 2 with the positioning square groove 9, and the installation position of the filter box 2 can be positioned to avoid deviation in the installation position. At the same time, by pushing the filter box 2, the positioning block 10 on it is limitedly moved in the positioning square groove 9 and contacts the fitting square plate 12, so that it is limitedly moved in the positioning square groove 9 and a number of fitting springs 13 are in a buffering state. When the filter box 2 is in the state, when the side surface of the filter box 2 is fitted with the side surface of the instrument 1, it indicates that the movement of the filter box 2 has reached the maximum position. At this time, the pull ring 5 is released, and the positioning spring 15 is reset to drive the positioning cross plate 4 to reset and move, so that the locking plug block 3 on it enters the instrument 1 and is connected with the locking slot 11, so that the positioning block 10 is limited and set, so that the filter box 2 on it is fixed in the current position, thereby completing the installation operation of the filter box 2, so that the air duct on the instrument 1 can avoid the accumulation of pollutants such as impurities, dust or particles in the air entering the instrument 1 and causing blockage when in use. By setting the filter box 2, the impurities attached to the air can be filtered when the gas enters the instrument 1, and different degrees of filtering effects can be achieved by installing different types of filter boxes 2, reducing the limitations of the device when in use, so that the device can correctly monitor the air quality in the laboratory, improve the accuracy of the monitoring results of the device, and thus improve the use effect of the device;

[0040] It is worth mentioning that when the positioning block 10 on the filter box 2 is limited to the current position and the force applied to the filter box 2 is lost, the positioning spring 15 in the buffer state cannot be reset, and the elastic force generated acts on the positioning block 10, thereby strengthening the contact strength between the locking plug 3 and the locking slot 11, so that the friction between the two is increased, and the locking plug 3 is prevented from being dislocated or moved due to non-human factors during use, thereby improving the use effect of the device; at the same time, when the filter box 2 needs to be maintained or replaced, it is only necessary to pull the pull ring 5 outward to make the locking plug 3 on the positioning cross plate 4 no longer connected to the locking slot 11, thereby releasing the limit setting of the positioning block 10, because the positioning spring 15 is no longer limited, the filter box 2 can be ejected by resetting the positioning spring 15, thereby completing the removal operation of the filter box 2, making the installation and removal of the filter box 2 convenient and quick, and can be completed without the help of any tools, reducing the limitations of the device when in use, so that it is convenient for operators to use different models of filter boxes 2 or to maintain them.

[0041] The pressurized anti-sway mechanism of this embodiment includes a fixed pulley 16 and a cable 17; auxiliary substrates 18 are installed on both sides of the fixed pulley 16, and the auxiliary substrate 18 is fixedly arranged on the bottom surface of the instrument 1; one end of the cable 17 is connected to the retaining round seat 8, and the other end bypasses the fixed pulley 16 and is connected to a winding drum 19, one side of the winding drum 19 is provided with an auxiliary circular groove 20, and the other side is provided with a rotating shaft 21, the rotating shaft 21 passes through the auxiliary substrate 18 and is connected to a rotating bevel gear 22, and the rotating bevel gear 22 is meshed and connected with a driving bevel gear 23, and a double-acting dust scraping assembly is also provided on the driving bevel gear 23; a clockwork spring 24 is also installed on the rotating shaft 21, and the end point of the clockwork spring 24 is connected to the auxiliary substrate 18; a locking direction control device is provided on the auxiliary circular groove 20; the locking direction control device includes a driving shaft 25, one end of the driving shaft 25 is arranged in the auxiliary circular groove 20, and the other end passes through the auxiliary substrate 18 and is connected to a driving disc 26 A guide column 27 is installed on the side of the driving disc 26, and a guide cross block 28 is slidably arranged on the guide column 27. Guide square plates 29 are installed on both sides of the guide cross block 28. Guide slide columns 30 are slidably arranged on the guide square plates 29. Several guide slide columns 30 are fixedly arranged on the bottom surface of the instrument 1; L-shaped square rods 31 are installed on the sides of the two guide square plates 29, and the two L-shaped square rods 31 are commonly connected to a pressure square plate 32; the pressure square plate 32 slides on A pressure storage box 43 is provided, and the pressure storage box 43 is fixedly arranged on the bottom surface of the instrument 1; a vent valve 44 is arranged on the side of the pressure storage box 43; air outlet valves 45 are installed on both sides of the pressure storage box 43, and a bent air pipe 46 is installed on the air outlet valve 45, and the two bent air pipes 46 are commonly connected to a rubber air bag 47, and one side of the rubber air bag 47 is fixedly arranged on the side of the instrument 1; the surrounding of the filter box 2 is located on the moving path of the inner wall of the rubber air bag 47;

[0042] When the device is installing the filter box 2, it is necessary to pull the pull ring 5 outward, and then the retaining round seat 8 on the positioning cylinder 6 moves. Under the action of the cable 17 and the fixed pulley 16, the winding drum 19 is rotated to release the wire, so that the rotating shaft 21 on it rotates on the auxiliary base plate 18 and drives the rotating bevel gear 22 to rotate, and the spring spring 24 is in a buffer state, so that when it is reset, it drives the winding drum 19 to reset and rotate and is used to wind the pull ring 5; at the same time, under the action of the locking direction controller, the driving shaft 25 does not rotate; when the installation is completed and the retaining round seat 8 is reset and moved, the driving shaft 25 can be rotated, and the driving disc 26 can be rotated, so that the guide column 27 on it moves on the guide cross block 28, so that The guide square plate 29 reciprocates on the guide slide column 30, so that the pressure square plate 32 reciprocates in the pressure storage box 43; when the pressure square plate 32 moves toward the direction of the instrument 1, that is, moves deep into the pressure storage box 43, the outlet valve 45 is opened and the vent valve 44 is closed, so that the gas in the pressure storage box 43 enters the rubber airbag 47 through the bent air pipe 46, so that the rubber airbag 47, which is initially in a weak state, expands due to the gas entering the inside; when the pressure square plate 32 resets and moves, that is, moves away from the instrument 1, the vent valve 44 is opened and the outlet valve 45 is closed, so that the external gas enters the pressure storage box 43 through the vent valve 44, and the gas passes through the pressure square plate 32. The next reciprocating movement of the pressing plate 32 enters the rubber airbag 47, causing the rubber airbag 47 to expand, and the inner side wall of the expanded rubber airbag 47 contacts the four sides of the installed filter box 2, further limiting the filter box 2 and preventing it from shaking or dislocating during use, thereby improving the stability of the filter box 2 during use. Moreover, since the contact surface between the rubber airbag 47 and the filter box 2 is made of rubber, the friction force on the contact of the filter box 2 is increased, and the rubber airbag 47 also strengthens the sealing and strength of the contact between the filter box 2 and the side of the instrument 1, thereby preventing the filter box 2 from shaking during use or the two not being in a fitted state, resulting in a loose connection between the filter box 2 and the instrument 1. The gap is formed by the rubber airbag 47, thereby preventing impurities mixed in the external gas from entering the instrument 1 through the gap, thereby improving the monitoring effect of the device and further reducing the limitations of the device when in use; it is worth mentioning that since the rubber airbag 47 is filled with gas, the rubber airbag 47 is in an elastic state. When the instrument 1 is in use, if the filter box 2 shakes during use, the impact force generated by the shaking will be transmitted to the rubber airbag 47, so that the internal gas is compressed, so that the cushioning property of the rubber airbag 47 can reduce the above-mentioned impact force, thereby preventing the filter box 2 from shaking during use and causing an impact on the device, thereby improving the stability of the filter box 2 and improving the use effect of the device.

[0043] The double-acting dust scraping assembly of this embodiment includes a displacement screw 33 arranged on the driving bevel gear 23, and L-shaped bases 34 are installed at both ends of the displacement screw 33. The two L-shaped bases 34 are arranged on the auxiliary base plate 18; the displacement blocks 35 are symmetrically arranged on the displacement screw 33, and the limiting square plates 36 are symmetrically arranged on the displacement blocks 35. A displacement cylinder 37 is fixedly installed on the limiting square plate 36, and a displacement base 38 is slidably arranged on the displacement cylinder 37. The displacement base 38 is arranged on the L-shaped base 34; the displacement blocks 35 are away from the L A driving rail 39 is installed on one side of the base 34, and a driving slider 40 is slidably arranged on the driving rail 39. A U-shaped square rod 41 is installed on the side of the driving slider 40. The opening direction of the U-shaped square rod 41 faces the filter box 2 and a scraper 42 is also installed on the end. The sharp part of the scraper 42 is located on the surface of the filter box 2; the end point where the U-shaped square rod 41 is connected to the scraper 42 is retractable; the displacement screw 33 is threadedly connected to the two displacement blocks 35, and the threads on the two ends of the displacement screw 33 are oppositely arranged;

[0044] When the device is installing the filter box 2 and the pull ring 5 is pulled outward, the rotating rotating bevel gear 22 is engaged with the driving bevel gear 23 to rotate, so that the displacement screw 33 on it rotates. Since the threads on both ends of the displacement screw 33 are opposite, the two displacement blocks 35 connected by threads are limitedly moved on the displacement base 38 through the displacement cylinder 37 on the limiting square plate 36, so that the two displacement blocks 35 move in opposite directions, and the two scrapers 42 move in opposite directions, so that they move to both sides of the instrument 1, avoiding being located on the installation path of the filter box 2 and affecting it. The filter box 2 can be installed and removed by the pull ring 5, and the impurities or particles adhering to the surface of the filter box 2 can be completely scraped off to avoid affecting the normal removal operation of the filter box 2 by the device, thereby reducing the work intensity of the staff. At the same time, when the filter box 2 is installed, the pull ring 5 is reset to move the driving bevel gear 23, and then the two scrapers 42 are reset and moved toward each other, so that they move to the outer surface of the filter box 2. The apparatus is retractable, so that the distance between the scraper 42 and the filter box 2 can be adjusted, which not only makes the cleaning intensity of the scraper 42 on the filter box 2 controllable, but also allows the staff to adjust the force applied by the scraper 42 to the surface of the filter box 2 in a timely manner according to the different viscosity of the impurities, so as to avoid the scraper 42 from contacting the filter box 2 insufficiently, resulting in poor cleaning effect, thereby improving the use effect of the device, and at the same time limiting the installation position of the filter box 2 to avoid dislocation or displacement during use; at the same time, during use, the instrument 1 can operate the driving slider 40 (with a built-in driving source, not shown in the figure) to make it slide on the driving slide rail 39, thereby driving the scraper 42 to reciprocate on the surface of the filter box 2, so that the instrument 1 can scrape off the impurities or particles adhered to the surface of the filter box 2 during use, thereby avoiding the long use period of the instrument 1 resulting in more impurities adsorbed on the surface of the filter box 2, resulting in its clogging, which reduces the use effect of the air duct on the instrument 1, improves the monitoring efficiency of the device, and avoids the device having more restrictions during use.

[0045] The locking direction controller of this embodiment includes a plurality of locking slide grooves 48 arranged on the outer side wall of the driving shaft 25; the inner side wall of the auxiliary circular groove 20 is provided with a stop bevel groove 49 of the same number as the locking slide groove 48; a stop bevel block 50 is slidably arranged in the locking slide groove 48, the stop bevel block 50 and the stop bevel groove 49 cooperate, and the stop bevel groove 49 is located on the moving path of the stop bevel block 50; the locking slide groove 48 is also provided with a locking spring 51, one end of the locking spring 51 is fixedly connected to the stop bevel block 50, and the other end is fixedly connected to the inner bottom surface of the locking slide groove 48;

[0046] When the device pulls the pull ring 5 when installing the filter box 2, the winding drum 19 unwinds and rotates, so that the inclined surfaces of the several stop inclined grooves 49 on the inner side wall of the auxiliary circular groove 20 in the winding drum 19 are constantly in contact with the inclined surfaces on the stop inclined block 50; when the two are in contact, the stop inclined block 50 is limited and moved in the locking slide groove 48, so that the locking spring 51 is in a buffering state; when the stop inclined groove 49 and the inclined surfaces on the stop inclined block 50 are not in contact, the stop inclined block 50 is reset and moved by the reset of the locking spring 51. Since the rotation of the winding drum 19 is continuous, the stop inclined block 50 is reciprocated in the locking slide groove 48, so that the locking spring 51 is constantly in a buffering and reset state, and then the driving shaft 25 cannot rotate; when the device completes the installation operation of the filter box 2, it is released. When the pull ring 5 is opened, the winding drum 19 is reset and rotated, and at this time, the straight surfaces on the anti-directional bevel groove 49 and the anti-directional bevel block 50 are in contact, so that the locking spring 51 cannot buffer the movement, which is equivalent to clamping the driving shaft 25 at the auxiliary circular groove 20 in the winding drum 19, thereby driving the driving disc 26 to rotate so that the pressurized anti-sway mechanism can be used, so that the driving disc 26 can only rotate in one direction, and it is avoided that when the device is installing the filter box 2, the rubber airbag 47 expands due to the rotation of the driving disc 26, thereby affecting the installation operation of the filter box 2, reducing the limitations of the device when in use, so that the effect of the device when in use is improved; it is worth mentioning that the locking direction controller can only rotate the driving disc 26 in one direction, and will not affect the driving bevel gear 23, so that the double-motion dust scraping assembly can still be used as usual.

[0047] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0048] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A chemical laboratory air quality monitoring device, comprising an instrument (1), wherein an air duct is provided on the side of the instrument (1); characterized in that: It also comprises a filter box (2), wherein the instrument (1) is provided with a fitting locking unit; the filter box (2) is installed and / or removed by operating the fitting locking unit; the fitting locking unit comprises two locking plugs (3), and the two locking plugs (3) are symmetrically arranged along the transverse central axis of the instrument (1); a positioning transverse plate (4) is installed on the opposite surfaces of the two locking plugs (3), and a pull ring (5) is installed on the side of the positioning transverse plate (4) away from the instrument (1); positioning cylinders (6) are symmetrically arranged on the opposite surfaces of the two positioning transverse plates (4), and positioning limit plates (7) are installed on the end points of a plurality of positioning cylinders (6); a retaining round seat (8) is also installed on a positioning limit plate (7) on the bottom surface of the instrument (1), and a pressurized anti-sway mechanism is arranged on the retaining round seat (8), and the pressurized anti-sway mechanism is used to prevent the filter box (2) from shaking when in use; The instrument (1) is symmetrically provided with positioning square grooves (9) on the side thereof; a positioning square block (10) having the same size and number as the positioning square groove (9) is provided on the side of the filter box (2) close to the instrument (1), and the positioning square groove (9) is located on the moving path of the positioning square block (10); a penetrating locking slot (11) is provided on the side of the positioning square block (10), and the locking slot (11) is located on the moving path of the locking plug (3); a fitting square plate (12) is slidably provided in the positioning square groove (9), and the fitting square plate (12) is located on the moving path of the positioning square block (10); A plurality of fitting springs (13) are arranged in the positioning square groove (9), one end of the fitting spring (13) is fixedly connected to the fitting square plate (12), and the other end is fixedly connected to the inner bottom surface of the positioning square groove (9); a plurality of positioning bases (14) are slidably arranged on the positioning cylinders (6), and the plurality of positioning bases (14) are fixedly arranged on the instrument (1); a positioning spring (15) is sleeved on the positioning cylinder (6), one end of the positioning spring (15) is fixedly connected to the positioning limit plate (7), and the other end is fixedly connected to the positioning base (14); The pressurized anti-sway mechanism comprises a fixed pulley (16) and a cable (17); auxiliary substrates (18) are installed on both sides of the fixed pulley (16), and the auxiliary substrates (18) are fixedly arranged on the bottom surface of the instrument (1); one end of the cable (17) is connected to the retaining round seat (8), and the other end of the cable (17) is connected to a winding drum (19) by passing through the fixed pulley (16); an auxiliary circular groove (20) is provided on one side of the winding drum (19), and a rotating shaft (21) is installed on the other side; the rotating shaft (21) passes through the auxiliary substrate (18) and is connected to a rotating bevel gear (22); the rotating bevel gear (22) is meshedly connected to a driving bevel gear (23), and a double-acting dust scraping assembly is also arranged on the driving bevel gear (23); a spring spring (24) is also installed on the rotating shaft (21), and an end point of the spring spring (24) is connected to the auxiliary substrate (18); The auxiliary circular groove (20) is provided with a locking direction control device; the locking direction control device comprises a driving shaft (25), one end of the driving shaft (25) is provided in the auxiliary circular groove (20), and the other end passes through the auxiliary base plate (18) and is connected to a driving disc (26); a guide column (27) is installed on the side of the driving disc (26); a guide cross block (28) is slidably provided on the guide column (27); guide square plates (29) are installed on both sides of the guide cross block (28); guide sliding columns (30) are slidably provided on the guide square plate (29), and a plurality of guide sliding columns (30) are fixedly provided on the bottom surface of the instrument (1); L-shaped square rods (31) are installed on the sides of two guide square plates (29), and the two L-shaped square rods (31) are commonly connected to a pressure square plate (32); A pressure storage box (43) is slidably arranged on the pressure-applying square plate (32), and the pressure storage box (43) is fixedly arranged on the bottom surface of the instrument (1); a ventilation valve (44) is arranged on the side of the pressure storage box (43); air outlet valves (45) are installed on both sides of the pressure storage box (43), and a bent air pipe (46) is installed on the air outlet valve (45), and the two bent air pipes (46) are connected to a rubber air bag (47), and one side of the rubber air bag (47) is fixedly arranged on the side of the instrument (1); the four sides of the filter box (2) are located on the moving path of the inner wall of the rubber air bag (47); The locking direction controller further comprises a plurality of locking grooves (48) arranged on the outer side wall of the driving shaft (25); the inner side wall of the auxiliary circular groove (20) is provided with a number of stop bevel grooves (49) which are the same as the number of the locking grooves (48); a stop bevel block (50) is slidably arranged in the locking groove (48); the stop bevel block (50) and the stop bevel groove (49) cooperate with each other, and the stop bevel groove (49) is located on the moving path of the stop bevel block (50); the locking groove (48) is further provided with a locking spring (51); one end of the locking spring (51) is fixedly connected to the stop bevel block (50), and the other end is fixedly connected to the inner bottom surface of the locking groove (48).

2. A chemical laboratory air quality monitoring device according to claim 1, characterized in that: The double-acting dust scraping assembly comprises a displacement screw (33) arranged on the driving bevel gear (23), L-shaped bases (34) are installed at both ends of the displacement screw (33), and the two L-shaped bases (34) are arranged on the auxiliary base plate (18); displacement blocks (35) are symmetrically arranged on the displacement screw (33), and limited square plates (36) are symmetrically arranged on the displacement blocks (35), a displacement cylinder (37) is fixedly installed on the limited square plate (36), a displacement base (38) is slidably arranged on the displacement cylinder (37), and the displacement base (38) is arranged on the L-shaped base (34).

3. A chemical laboratory air quality monitoring device according to claim 2, characterized in that: A driving rail (39) is installed on the side of the displacement block (35) away from the L-shaped base (34), a driving slider (40) is slidably arranged on the driving rail (39), a U-shaped square rod (41) is installed on the side of the driving slider (40), the opening direction of the U-shaped square rod (41) faces the filter box (2) and a scraper (42) is also installed on the end point, and the sharp part of the scraper (42) is located on the surface of the filter box (2); the end point where the U-shaped square rod (41) is connected to the scraper (42) is retractable.

4. A chemical laboratory air quality monitoring device according to claim 2, characterized in that: The displacement screw rod (33) is threadedly connected to the two displacement blocks (35), and the threads on both ends of the displacement screw rod (33) are arranged in opposite directions.

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