CN115420733B

CN115420733B - Portable COD monitoring device

Info

Publication number: CN115420733B
Application number: CN202210973377.XA
Authority: CN
Inventors: 武治国; 潘凌; 徐锦锋; 游政园; 刘冰洋; 徐凯; 张春萍
Original assignee: Wuhan Newfiber Optoelectronics Co Ltd
Current assignee: Wuhan Newfiber Optoelectronics Co Ltd
Priority date: 2022-08-15
Filing date: 2022-08-15
Publication date: 2023-04-21
Anticipated expiration: 2042-08-15
Also published as: CN115420733A

Abstract

The invention provides a portable COD monitoring device, which comprises a reaction box, wherein five digestion colorimetric tubes are equidistantly arranged in the reaction box, a heating aluminum block is arranged at the bottom of each digestion colorimetric tube, heating holes are formed in the surface of each heating aluminum block, the bottom of each digestion colorimetric tube is inserted into each heating hole, and separation mechanisms are arranged on two sides of the inner wall of the reaction box.

Description

Portable COD monitoring device

Technical Field

The invention relates to the technical field of COD water quality monitoring, in particular to a portable COD monitoring device.

Background

At present, the known method for detecting COD is that a worker adds a sampled water sample into a test tube to digest the water sample, and colorimetry is carried out on the water sample after the reaction is complete, but the method has some problems that on one hand, most of the water sample is carried out in a laboratory and is added into a reaction test tube from sampling, the time spent in the process is easy to cause deterioration of the sampled water sample and a solvent in the reaction test tube, so that the detection result is affected, on the other hand, the time of manually adding the sampled water quality into the test tube of a catalyst is long, the catalyst in the test tube is easy to oxidize and lose the effect of the catalyst, the detection result is affected, and in addition, a heavy detection instrument is not easy to carry, so that the detection efficiency cannot be improved.

Disclosure of Invention

Aiming at the defects existing in the prior art, the invention aims to provide the portable COD monitoring device so as to solve the problems in the background art, and the portable COD monitoring device is novel in structure, reduces the time of opening a test tube, maintains the activity of a catalyst, improves the detection accuracy, is convenient to carry the whole device to directly detect at a water source site, and accelerates the detection efficiency through the cooperation of a sealing assembly and a water injection pipe.

In order to achieve the above object, the present invention is realized by the following technical scheme: the utility model provides a portable COD monitoring devices, includes the reaction tank, the inside equidistance of reaction tank is equipped with five and clears up the color comparison tube, and the color comparison tube bottom of just clearing up is equipped with the heating aluminium piece, the heating hole has been seted up on the heating aluminium piece surface, it inserts the inside of heating hole to clear up color comparison tube bottom, the reaction tank inner wall both sides are equipped with separating mechanism, and separating mechanism is connected with the transmission with clear up color comparison tube and heating aluminium piece, the orificial position of color comparison tube is equipped with sealing mechanism to reaction tank top perpendicular to digestion, reaction tank one side inner wall corresponds and clears up color comparison tube orificial position equidistance and be provided with the water injection pipe.

In this embodiment, a cooling layer is disposed at the top of the reaction box, and two heat dissipation windows are symmetrically disposed on a surface of one side of the cooling layer.

In this embodiment, the separation subassembly includes two-way screw rod, the reaction box is located five and is cleared up the both sides rotation of color comparison tube and install two-way screw rod, and symmetrical engagement has cup jointed two thread bush on the two-way screw rod surface, clear up color comparison tube on the surface fixed mounting have fixed cover, five clear up color comparison tube and five heating aluminium piece all through connecting rod fixed connection, two the connecting rod respectively with same horizontal plane's thread bush fixed connection, two-way screw rod axis department fixed mounting has driven bevel gear, driven bevel gear one side meshing is connected with drive bevel gear, and drive bevel gear passes through the bearing and rotate and install on the reaction box inner wall, drive bevel gear axle center department wears out the reaction box and is fixed with the second knob.

In this embodiment, sealing mechanism includes first guiding tube, first guiding tube slides and peg graft in reaction box top and corresponds digestion cuvette mouth of pipe's position, and the inside spliced pole that has through screw-fit meshing of first guiding tube, the spliced pole top is fixed with first knob, and the spliced pole bottom is fixed with sealed lid, digestion cuvette top mouth of pipe department is equipped with the screw thread circle, and sealed lid and screw thread circle meshing are connected.

In this embodiment, the water injection pipe is fixed to be cup jointed the second guide cylinder on the horizontal surface, and the second guide cylinder slides and peg graft on the reaction tank lateral wall, the spliced pole is equipped with the gear on the surface that is located first guide cylinder bottom, and gear one side meshing is connected with the pinion rack, the pinion rack becomes L type, and pinion rack bottom and second guide cylinder fixed surface are connected.

In this embodiment, two sliders are symmetrically fixed on the inner ring of the gear, and a chute is formed on the path of the connecting column corresponding to the gear, and the sliders are slidably clamped inside the chute.

In this embodiment, limiting plates are fixed at two ends of the first guide cylinder and the second guide cylinder, and the limiting plates are in sealing contact with the inner wall and the outer wall of the reaction box.

In this embodiment, the inner wall of the reaction box is located at the bottom of the water injection pipe and is fixedly provided with a photometer, and the outer surface of the reaction box is fixedly provided with a display screen.

In this embodiment, handles are symmetrically fixed on two sides of the outer wall of the top of the reaction box.

In this embodiment, the photometer, the display screen and the heating aluminum block are all electrically connected with an external power supply and a switch through wires.

The invention has the beneficial effects that: the invention relates to a portable COD monitoring device, which comprises a reaction box; a cooling layer; a heat radiation window; a photometer; a handle; a display screen; a sealing mechanism; a connecting column; sealing cover; a first knob; a toothed plate; a gear; a chute; a slide block; a first guide cylinder; a separation mechanism; a fixed sleeve; a connecting rod; a second knob; a bidirectional screw; a thread sleeve; a drive bevel gear; a driven bevel gear; a water injection pipe; a second guide cylinder; digestion colorimetric tubes; a thread ring; heating the aluminum block; and a limiting plate.

1. This portable COD monitoring device has realized the cooperation heating of pegging graft between digestion cell and the heating aluminium piece under separating mechanism's effect, also makes things convenient for the later stage to separate both simultaneously, and the cooling layer cooling is sent into to the heating aluminium piece, and digestion cell just carries out the sample processing to the photometer, saves the time that digestion cell after manual transport heating carries out the photometer sample.

2. This portable COD monitoring devices has realized under sealing mechanism effect to the sealed convenience of digestion cuvette itself, the linkage effect of cooperation water injection pipe for sealing in-process water injection pipe is kept away from, and deblocking in-process water injection pipe is close to, and both pass through the switching synchronous motion of state and be opposite motion trend, has practiced thrift the sealed time that takes in the in-process of adding sample water to the test tube from contact test tube greatly, the effectual time that has reduced the inside reagent of test tube and air contact has improved the activity of digestion cuvette inside reagent, has also improved photometer detection accuracy.

3. According to the portable COD monitoring device, under the cooperation of the sliding block and the sliding groove, the connecting column can be meshed and connected with the gear and the rack under the active lifting movement and the passive lifting of the separating mechanism, so that the sealing mechanism and the water injection pipe are kept in transmission connection, the movement synchronism is realized, the two operation steps are converted into one step and are synchronously carried out, and the efficiency of detecting the water sample is greatly improved.

4. This portable COD monitoring devices appearance is small and exquisite, for placing in the large-scale equipment in laboratory, conveniently carries more, and directly carries out on-the-spot detection at the water source site, reduces the problem such as the water sample deterioration that transfer time overlength led to because the reaction box appearance is small and exquisite and sealed, consequently reduce the inside oxygen content of reaction box, reduce the factor that influences the testing result.

Drawings

FIG. 1 is a schematic diagram of the overall front structure of a portable COD monitoring device according to the present invention;

FIG. 2 is a sectional view showing the internal structure of a portable COD monitoring device according to the present invention;

FIG. 3 is a schematic diagram of a separation mechanism of a portable COD monitoring device according to the present invention;

FIG. 4 is a schematic view of the overall back structure of a portable COD monitoring device according to the present invention;

FIG. 5 is a schematic diagram showing the positional relationship among a sealing mechanism, a water injection pipe and a digestion colorimetric cylinder of a portable COD monitoring device according to the present invention;

FIG. 6 is a schematic diagram of a sealing mechanism of a portable COD monitoring device according to the present invention;

FIG. 7 is a second schematic diagram of a sealing mechanism of a portable COD monitoring device according to the present invention;

in the figure: 1. a reaction box; 11. a cooling layer; 12. a heat radiation window; 13. a photometer; 2. a handle; 3. a display screen; 4. a sealing mechanism; 41. a connecting column; 42. sealing cover; 43. a first knob; 44. a toothed plate; 45. a gear; 46. a chute; 47. a slide block; 48. a first guide cylinder; 5. a separation mechanism; 51. a fixed sleeve; 52. a connecting rod; 53. a second knob; 54. a bidirectional screw; 55. a thread sleeve; 56. a drive bevel gear; 57. a driven bevel gear; 6. a water injection pipe; 61. a second guide cylinder; 7. digestion colorimetric tubes; 71. a thread ring; 8. heating the aluminum block; 9. and a limiting plate.

Detailed Description

The invention is further described in connection with the following detailed description, in order to make the technical means, the creation characteristics, the achievement of the purpose and the effect of the invention easy to understand.

Referring to fig. 1 to 7, the present invention provides a technical solution: the portable COD monitoring device comprises a reaction box 1, five digestion colorimetric tubes 7 are equidistantly arranged in the reaction box 1, a heating aluminum block 8 is arranged at the bottom of each digestion colorimetric tube 7, heating holes are formed in the surface of each heating aluminum block 8, the bottom of each digestion colorimetric tube 7 is inserted into each heating hole, separating mechanisms 5 are arranged on two sides of the inner wall of the reaction box 1, the separating mechanisms 5 are in transmission connection with the digestion colorimetric tubes 7 and the heating aluminum block 8, sealing mechanisms 4 are arranged at positions, perpendicular to the mouths of the digestion colorimetric tubes 7, of the top of the reaction box 1, water injection tubes 6 are equidistantly arranged at positions, corresponding to the mouths of the digestion colorimetric tubes 7, of the inner wall of one side of the reaction box 1, a photometer 13 is fixedly arranged at the bottom of each water injection tube 6, a display screen 3 is fixedly arranged on the outer surface of the reaction box 1, the photometer 13, the display screen 3 and the heating aluminum block 8 are all electrically connected with an external power supply and a switch through wires, when the device is used, the switch is turned on, the external power supply supplies power to the photometer 13, the display screen 3 and the heating aluminum block 8 for working, the device is moved to a water source place and placed on a stable ground, in an initial state, the digestion colorimetric tube 7 is inserted along a heating hole on the surface of the heating aluminum block 8, potassium dichromate is added into the digestion colorimetric tube 7 as an oxidant, silver sulfate is a catalyst, mercury sulfate is a masking agent of chloride ions, then the sealing mechanism 4 is regulated for sealing and protecting a test tube, at the moment, the outlet of the water injection tube 6 is far away from the digestion colorimetric tube 7, after a water sample is taken through an external water suction tube, the sealing mechanism 4 is reversely driven to discharge a test tube mouth, under the linkage of the sealing mechanism 4 and the water injection tube 6, the outlet of the water injection tube 6 approaches to the mouth of the digestion colorimetric tube 7 until the mouth of the test tube is aligned, the water sample is injected into the inlet of the water injection pipe 6, enters the digestion colorimetric pipe 7 through the conveying of the water injection pipe 6, is immediately sealed by the sealing mechanism 4, the heating aluminum block 8 is started to heat the digestion colorimetric pipe 7 in the digestion colorimetric pipe 7, the bottom of the sealing pipe is heated at a constant temperature of 165 ℃, the upper part of the digestion colorimetric pipe 7 is higher than a heating hole and is exposed to the space, the top of the pipe orifice is reduced to about 85 ℃ under the natural cooling of air, after the heating is finished, the opening of the separating mechanism 5 is controlled, the digestion colorimetric pipe 7 and the heating aluminum block 8 are separated, the photometer 13 on the inner wall performs the sample measurement of the digestion colorimetric pipe 7 (the photometer 13 is a special photometer 13 for COD, the sample with the COD value of 100 mg/L-1000 mg/L can be measured at the wavelength of 600nm, the sample with the COD value of 15 mg/L-250 mg/L can be measured at the wavelength of 440 nm), the detection of different water samples can be simultaneously performed by the digestion colorimetric pipes 7 with the diameter of 16 mm-150 mm, the wall thickness of the digestion colorimetric pipe 7 is 1.0 mm-1.0 mm, the aperture diameter of the aluminum block is 1.2mm, and the depth of the diameter of the digestion colorimetric pipe 7 is 100 mm-50 mm.

In this embodiment, the cooling layer 11 is disposed at the top of the reaction tank 1, and two heat dissipation windows 12 are symmetrically disposed on one side surface of the cooling layer 11, and the heating aluminum block 8 is driven by the separating mechanism 5 to enter the cooling layer 11, so that on one hand, the sampling of the digestion colorimetric tube 7 by the photometer 13 cannot be affected, and on the other hand, the heat dissipation effect of the heat dissipation windows 12 allows the heating aluminum block 8 to be cooled in an accelerated manner, so that the heat accumulation inside the reaction tank 1 is avoided.

In this embodiment, the separation assembly includes a bidirectional screw 54, the reaction box 1 is located at two sides of the five digestion colorimetric tubes 7, the bidirectional screw 54 is rotatably installed, two threaded sleeves 55 are symmetrically engaged and sleeved on the surface of the bidirectional screw 54, a fixed sleeve 51 is fixedly installed on the surface of the digestion colorimetric tube 7, five digestion colorimetric tubes 7 and five heating aluminum blocks 8 are fixedly connected through a connecting rod 52, two connecting rods 52 are fixedly connected with the threaded sleeves 55 on the same horizontal plane respectively, a driven bevel gear 57 is fixedly installed at the center shaft of the bidirectional screw 54, one side of the driven bevel gear 57 is engaged and connected with a driving bevel gear 56, the driving bevel gear 56 is rotatably installed on the inner wall of the reaction box 1 through a bearing, a second rotary knob 53 penetrates out of the reaction box 1 at the axis of the driving bevel gear 56, after the digestion liquid inside the digestion colorimetric tubes 7 is thoroughly reacted in a detection water bath, the second rotary knob 53 drives the rotation of the driving bevel gear 57 and is engaged with the driven bevel gear 57, the driven bevel gear 57 rotates along with the rotation of the same horizontal plane of the threaded sleeve 55, the two heating bevel gears 54 are engaged with the driven bevel gear 57, and the two heating aluminum blocks are enabled to be directly opposite to be engaged with the cooling bevel gear 57, and the cooling down the cooling layer of the same horizontal plane of the heating aluminum blocks 7 is directly opposite to be cooled down, and the cooling layer of the heating bevel gear 7 is directly opposite to the cooling layer of the heating bevel gear 7, and the cooling layer of the cooling layer is directly cooled, and the cooling layer of the cooling layer is directly is cooled.

In this embodiment, the sealing mechanism 4 includes a first guiding cylinder 48, the first guiding cylinder 48 is slidingly inserted in a position of the top of the reaction box 1 corresponding to the orifice of the digestion cuvette 7, and the inside of the first guiding cylinder 48 is engaged and inserted with a connecting column 41 through a threaded fit, a first knob 43 is fixed on the top of the connecting column 41, a sealing cover 42 is fixed at the bottom of the connecting column 41, a threaded ring 71 is disposed at the orifice of the top of the digestion cuvette 7, and the sealing cover 42 is engaged with the threaded ring 71, and is connected with the threaded ring 71 through rotating the first knob 43, so that the connecting column 41 is engaged with the first guiding cylinder 48 and moves in a vertical direction, and the sealing cover 42 is close to or far away from the orifice of the digestion cuvette 7, and because the threaded ring 71 is disposed at the orifice of the digestion cuvette 7, the sealing cover 42 is engaged and sleeved on the orifice of the digestion cuvette 7 in a rotating process, so that the sealing effect on the digestion cuvette 7 moves synchronously along the inner wall of the reaction box 1 along with the vertical direction when the separation mechanism 5 moves.

In this embodiment, the horizontal surface of the water injection pipe 6 is fixedly sleeved with the second guide cylinder 61, the second guide cylinder 61 is slidingly inserted on the side wall of the reaction box 1, the connecting column 41 is located on the surface of the bottom of the first guide cylinder 48 and is provided with the gear 45, one side of the gear 45 is engaged with and connected with the toothed plate 44, the toothed plate 44 is L-shaped, the bottom of the toothed plate 44 is fixedly connected with the surface of the second guide cylinder 61, two sliding blocks 47 are symmetrically fixed on the inner ring of the gear 45, a sliding groove 46 is formed in the path of the connecting column 41 corresponding to the movement of the gear 45, the sliding blocks 47 are in sliding connection with the sliding groove 46, when the first rotary knob 43 is rotated, the connecting column 41 is rotated along the path perpendicular to the digestion cuvette 7, the gear 45 sleeved on the surface of the connecting column 41 rotates together with the connecting column 41 due to the clamping effect of the sliding blocks 47 and the sliding groove 46, and when the connecting column 41 is lifted, the sliding blocks 47 on the inner wall of the gear 45 slide along the sliding grooves 46, so that the gear 45 always keeps engaged with the toothed plate 44, and the sliding blocks 45 are driven by the sliding blocks 44 under the effect of the sliding blocks 44, and the sliding blocks 45 along the sliding grooves 46, and the second guide cylinder 61 are driven by the sliding guide cylinder 6 and the second guide cylinder 6 to move along the side wall of the reaction box 1.

The water injection pipe 6 is opposite to the movement trend of the sealing cover 42, when the sealing cover 42 approaches the orifice of the digestion colorimetric pipe 7, the water injection pipe 6 moves away, when the sealing cover 42 approaches the orifice of the digestion colorimetric pipe 7, the water injection pipe 6 approaches the orifice of the digestion colorimetric pipe 7, two critical values are respectively that the outlet of the water injection pipe 6 is just opposite to the orifice of the digestion colorimetric pipe 7 (at the moment, the sealing cover 42 is positioned at the upper end of the outlet of the water injection pipe 6) and the sealing cover 42 are in meshed and sleeved connection with the orifice of the digestion colorimetric pipe 7 (at the moment, the water injection pipe 6 is far away from the digestion colorimetric pipe 7), in addition, the digestion colorimetric pipe 7 is lifted along with the separating mechanism 5, simultaneously, the sliding blocks 47 on the inner wall of the gear 45 are also in sliding connection with the toothed plate 44 along the sliding grooves 46, the sealing cover 42 and the water injection pipe 6 move synchronously through state switching and are in opposite movement trend, so that the time spent in the process of adding the sample water into the test tube from the contact test tube is greatly saved, the time of the internal reagent of the test tube is effectively shortened, and the detection accuracy is improved.

In this embodiment, the limiting plates 9 are fixed at the two ends of the first guide cylinder 48 and the second guide cylinder 61, and the limiting plates 9 are in sealing contact with the inner wall and the outer wall of the reaction box 1, so that the limiting plates 9 play a role in preserving heat inside the reaction box 1, prevent the heat loss from causing uneven reaction of the digestion colorimetric tube 7, and limit the movement range of the first guide cylinder 48 and the second guide cylinder 61 and prevent the digestion colorimetric tube from being separated from the reaction box 1.

In this embodiment, the handles 2 are symmetrically fixed on two sides of the outer wall of the top of the reaction box 1, and the device is moved to a water source through the handles 2, so that convenience of the device is reflected.

When the device is used, the device is moved to a water source place through the handle 2 and placed on a stable ground, in an initial state, the digestion cuvette 7 is inserted along a heating hole on the surface of the heating aluminum block 8, potassium dichromate is added into the digestion cuvette 7 as an oxidant, silver sulfate is used as a catalyst, mercury sulfate is used as a masking agent of chloride ions, the connecting column 41 is meshed with the first guide cylinder 48 by rotating the first rotary knob 43 and moves in the vertical direction, the sealing cover 42 is close to the orifice of the digestion cuvette 7, and due to the threaded ring 71 arranged at the orifice of the digestion cuvette 7, the sealing cover 42 is meshed and sleeved on the orifice of the digestion cuvette 7 in the rotating process, the sealing effect on the digestion cuvette is realized, the connecting column 41 is rotated along a path vertical to the digestion cuvette 7 when the first rotary knob 43 is rotated, the gear 45 sleeved on the surface of the connecting column 41 is in the clamping effect of the sliding block 47 and the sliding groove 46, when the connecting column 41 is lifted, the sliding block 47 on the inner wall of the gear 45 slides along the sliding groove 46 in a matching way, so that the gear 45 always keeps meshed with the toothed plate 44, when sample water needs to be added into the digestion colorimetric tube 7, the first rotary knob 43 is reversely rotated, the sealing cover 42 is separated from the sealing effect on the mouth of the digestion colorimetric tube 7, under the action of the gear 45 and the toothed plate 44, the toothed plate 44 drives the second guide cylinder 61 and the water injection tube 6 to move along the horizontal direction until the outlet of the water injection tube 6 is opposite to the mouth of the digestion colorimetric tube 7, the water enters the digestion colorimetric tube 7 through the delivery of the water injection tube 6, then the sealing mechanism 4 is repeatedly utilized to seal the digestion colorimetric tube 7, the water injection tube 6 is far away, the heating aluminum block 8 is started to heat the digestion colorimetric tube 7 inside, the bottom of the sealing tube is constantly heated at 165 ℃, the upper part of the digestion colorimetric tube 7 is higher than the heating hole and is exposed in the space, the top of the tube orifice is cooled to about 85 ℃ under the natural cooling of air, after the heating is finished, the second rotary buttons 53 on the two sides of the reaction box 1 are manually rotated, the second rotary buttons 53 drive the drive bevel gears 56 to rotate and are meshed with the driven bevel gears 57, the driven bevel gears 57 rotate along with the bidirectional screw 54, two thread sleeves 55 on the surface of the bidirectional screw 54 move reversely under the meshing effect, the digestion colorimetric tube 7 is separated from the heating aluminum block 8 under the matching of the connecting rod 52 and the thread sleeves 55 on the same horizontal line, the heating aluminum block 8 is sent into the cooling layer 11 to be cooled, and the digestion colorimetric tube 7 is subjected to sampling treatment to the photometer 13.

While the fundamental and principal features of the invention and advantages of the invention have been shown and described, it will be apparent to those skilled in the art that the invention is not limited to the details of the foregoing exemplary embodiments, but may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.

Claims

1. The utility model provides a portable COD monitoring device, includes reaction tank (1), its characterized in that: five digestion colorimetric tubes (7) are arranged in the reaction box (1) at equal intervals, heating aluminum blocks (8) are arranged at the bottoms of the digestion colorimetric tubes (7), heating holes are formed in the surfaces of the heating aluminum blocks (8), the bottoms of the digestion colorimetric tubes (7) are inserted into the heating holes, separating mechanisms (5) are arranged on two sides of the inner wall of the reaction box (1), the separating mechanisms (5) are in transmission connection with the digestion colorimetric tubes (7) and the heating aluminum blocks (8), sealing mechanisms (4) are arranged at positions, perpendicular to the mouths of the digestion colorimetric tubes (7), of the tops of the reaction box (1), water injection tubes (6) are arranged at the positions, perpendicular to the mouths of the digestion colorimetric tubes (7), of the inner wall of one side of the reaction box (1), the separating mechanisms (5) comprise bidirectional screws (54), the two sides of the reaction box (1) are rotatably provided with the bidirectional screws (54), two threaded sleeves (55) are symmetrically meshed on the surfaces of the two surfaces of the digestion colorimetric tubes (7), fixing sleeves (51) are fixedly arranged on the surfaces of the digestion tubes (7), the five digestion colorimetric tubes (7) are fixedly connected with the same connecting rods (52) through the same one pair of the two heat connecting rods (52), the utility model discloses a reaction box, including reaction box (1) and a side wall of the reaction box (45), including two-way screw (54) and sealing mechanism (4), driven bevel gear (57) is fixedly installed in axis department, driven bevel gear (57) is connected with initiative bevel gear (56) in one side meshing, and initiative bevel gear (56) are installed on the inner wall of reaction box (1) through the bearing rotation, initiative bevel gear (56) axle center department wears out reaction box (1) and is fixed with second knob (53), sealing mechanism (4) include first guide cylinder (48), first guide cylinder (48) sliding connection is in reaction box (1) top position of corresponding digestion cuvette (7) mouth of pipe, and first guide cylinder (48) inside is through screw-thread fit meshing grafting spliced pole (41), spliced pole (41) top is fixed with first knob (43), and spliced pole (41) bottom is fixed with sealed lid (42), digestion cuvette (7) top mouth of pipe department is equipped with screwed collar (71), and sealed lid (42) are connected with screwed collar (71) meshing, second guide cylinder (61) have been fixedly cup jointed on the horizontal surface on water injection pipe (6), and second guide cylinder (61) sliding connection is equipped with on the side wall (45) on one side of the side wall (45), the toothed plate (44) is L-shaped, the bottom of the toothed plate (44) is fixedly connected with the surface of the second guide cylinder (61), two sliding blocks (47) are symmetrically fixed on the inner ring of the gear (45), a sliding groove (46) is formed in a path of the connecting column (41) corresponding to the movement of the gear (45), the sliding blocks (47) are slidably clamped inside the sliding groove (46), limiting plates (9) are fixed at two ends of the first guide cylinder (48) and two ends of the second guide cylinder (61), and the limiting plates (9) are in sealing contact with the inner wall and the outer wall of the reaction box (1).

2. The portable COD monitoring device of claim 1, wherein: the top of the reaction box (1) is provided with a cooling layer (11), and two radiating windows (12) are symmetrically arranged on the surface of one side of the cooling layer (11).

3. The portable COD monitoring device of claim 1, wherein: the inner wall of the reaction box (1) is positioned at the bottom of the water injection pipe (6) and fixedly provided with a photometer (13), and the outer surface of the reaction box (1) is fixedly provided with a display screen (3).

4. The portable COD monitoring device of claim 1, wherein: handles (2) are symmetrically fixed on two sides of the outer wall of the top of the reaction box (1).

5. A portable COD monitoring device according to claim 3, wherein: the photometer (13), the display screen (3) and the heating aluminum block (8) are electrically connected with an external power supply and a switch through wires.