CN210647576U - Cleaning device for COD water quality analyzer digestion tube - Google Patents

Abstract

The utility model relates to a COD water quality analyzer clears up belt cleaning device of pipe, including open-top's flourishing sour box and can dismantle the cleaning platform of the stairstepping of being connected with the top surface of flourishing sour box, be provided with a plurality of bracing piece on the top surface of cleaning platform, the bottom of flourishing sour box is inlayed and is equipped with the hot plate, be provided with the pickling cavity with flourishing sour box intercommunication in the bracing piece, be provided with a plurality of pickling hole on the bracing piece, the orientation horizontal slip along perpendicular to bracing piece axis on the cleaning platform is connected with the locating piece of L shape, two locating pieces are a set of and every group locating piece sets up the both sides at the bracing piece that corresponds with the relative state symmetry of direction of bending, be provided with closing device on the top surface of cleaning platform. The digestion pipes are inverted on the supporting rods, the positioning blocks are driven by the pressing devices to slide towards the digestion pipes until the two positioning blocks compress tightly and support the digestion pipes, and the digestion pipes are fixed on the cleaning platform due to pressing force and friction force of the positioning blocks and do not move when being washed.

Description

Cleaning device for COD water quality analyzer digestion tube

Technical Field

The utility model belongs to the technical field of belt cleaning device's technique and specifically relates to a belt cleaning device that pipe was cleared up to COD water quality analyzer is related to.

Background

COD refers to chemical oxygen demand, generally refers to the amount of reducing substances needing to be oxidized in a water sample measured by a chemical method, and is an important water body organic matter pollution parameter which can be measured at a high speed. The COD water quality analyzer is also called a COD detector or a COD determinator, and is equipment specially used for detecting the content of COD in a water sample. The test tube used by the COD determinator is usually a reusable digestion tube which is a high-temperature resistant glass sealing tube with a specific specification and has the performances of acid resistance, high temperature resistance, pressure resistance and burst resistance. The digestion tube must be cleaned before reuse to prevent residual reagents or samples from interfering with the results of the next assay.

The utility model discloses a clear up a tub belt cleaning device is disclosed in the present utility model patent document that the bulletin number is CN208662016U, including flourishing sour box, sour bottom plate and washing subassembly of evaporating, wash the subassembly and include sleeve, a plurality of water course and pipe support, the water course is transversely arranged in the sleeve, and the water inlet has been seted up to the water course right-hand member, is equipped with right lock nut between water course right-hand member and the sleeve, and water course left end fixedly connected with water plug is equipped with left lock nut between water course left end and the sleeve, a plurality of upwards extending water pipes of fixedly connected with on the water course top face, the inner chamber of water pipe intercommunication water. The user will clear up the pipe and invert on the pipe holder, evaporate the solution heating to the acid in the flourishing acid box, the steam that the acid evaporated the solution contacts with clearing up the pipe, acid evaporates the back of accomplishing, pours the pure water into the water course, and the pipe is cleared up the pipe with pure water conservancy diversion entering, and the pure water will clear up impurity on the pipe wall and the washing of acid evaporation solution is fallen. The trouble that the experimenter manually washes the acid steaming solution and impurities is avoided through the operation, the strong corrosivity of the acid steaming solution is prevented from causing the experimenter to be injured, the cleaning is convenient, and the safety is good.

The above prior art solutions have the following drawbacks: to some stubborn attached impurities, must evaporate the pure water of the certain water pressure of cooperation with acid and wash, need ultrasonic oscillation washing even when necessary, but do not set up on the pipe support and will clear up the device that the pipe was fixed on the pipe support, if water pressure is great very easily make clear up the pipe displacement or let clear up the pipe because with the pipe support striking damage, it is inconvenient to wash.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a COD water quality analyzer clears up belt cleaning device of pipe can convenient washing clear up the pipe.

The above utility model discloses an above-mentioned utility model purpose can realize through following technical scheme: the cleaning device for the digestion tube of the COD water quality analyzer comprises an acid containing box for bearing acid washing solution and with an open top and a step-shaped cleaning platform detachably connected with the top surface of the acid containing box, wherein a plurality of supporting rods for supporting the digestion tube are arranged on the top surface of the cleaning platform, a heating plate for heating the acid washing solution is embedded in the bottom of the acid containing box, an acid washing cavity communicated with the acid containing box is arranged in the supporting rod, a plurality of acid washing holes for discharging acid washing steam in the acid washing cavity are arranged on the supporting rod, an L-shaped positioning block is horizontally connected on the cleaning platform in a sliding manner along the direction vertical to the axis of the supporting rod, two positioning blocks are in one group, each positioning block is symmetrically arranged on two sides of the corresponding supporting rod in a state with opposite bending directions, and a pressing device for controlling the horizontal sliding of the positioning block is arranged on the top surface of the cleaning platform, the cleaning platform is provided with a flushing device used for spraying flushing water flow into the digestion pipe, an annular collecting groove is formed in the annular stepped surface of the cleaning platform, and a liquid outlet is formed in the collecting groove.

Through adopting above-mentioned technical scheme, the user will clear up the pipe and invert on the bracing piece, clear up the pipe through closing device drive locating piece orientation and slide to two locating pieces and compress tightly and support and clear up the pipe, heat pickling solution through the hot plate, pickling steam rises naturally and gets into in the pickling cavity and flow out from the pickling hole, the acid is evaporated and is cleared up the pipe and accomplish the softening work back of remaining reactant, wash pickling solution through washing unit to clearing up intraductal jet stream, it is firmly fixed on cleaning platform because of the packing force and the frictional force of locating piece to clear up the pipe in the washing process, can not take place the displacement and also can not collide the damage with the bracing piece, washing waste water is discharged by the drainage through collecting vat and leakage fluid dram in proper order, realize clearing up the convenient washing of pipe through the above-.

The utility model discloses further set up to: and shock-absorbing layers made of fluororubber are fixed on the opposite surfaces of the positioning blocks in the same group.

Through adopting above-mentioned technical scheme, fluororubber has elasticity and corrosion-resistant high temperature resistant that can be used for buffering and keep apart, and this makes the buffer layer can strengthen the locating piece and clear up the frictional force between the pipe prevent the locating piece and clear up wearing and tearing each other between the pipe, and is better to the tight effect of clamp and the fixed effect of clearing up the pipe, and effectively prolongs the locating piece and clears up the life of pipe.

The utility model discloses further set up to: the flushing device comprises a water guide cavity arranged in the supporting rod, the water guide cavity is communicated with a plurality of flushing holes extending to the outside of the supporting rod, the flushing holes are arranged in a linear array along the bus direction of the supporting rod, the water guide cavity is connected with a water storage tank through a pipeline, and a cleaning pump used for driving water in the water storage tank to sequentially flush the digestion tube through the water guide cavity and the flushing holes is connected onto the water storage tank.

Through adopting above-mentioned technical scheme, the user pressurizes and drives rivers to the water guide cavity through the scavenging pump to the water in the storage water tank, and then water is spun from the washing hole and is washed the inner wall of clearing up the pipe, and area of contact is big, and washing effect is good.

The utility model discloses further set up to: the quantity of water guide cavity and pickling cavity is a plurality of and encircles the crisscross setting of the axis of bracing piece, with single the pickling hole of pickling cavity intercommunication sets up along bracing piece generating line direction linear array and is equal height with adjacent flushing hole, swivelling joint has the switching section of thick bamboo of establishing on the bracing piece with bracing piece coaxial line and cover on the bracing piece, be provided with a plurality of on the switching section of thick bamboo and switch the hole, the diameter that switches hole, flushing hole and pickling hole equals, the pickling hole staggers completely with the switching hole when switching hole and flushing hole coincide completely, flushing hole and switching hole stagger completely when switching hole and pickling hole coincide completely, be provided with on the cleaning platform and be used for controlling the rotatory rotary mechanism of switching section of thick bamboo.

Through adopting above-mentioned technical scheme, the user can drive the switching section of thick bamboo rotation at the sour back that evaporates the end of the end through rotary mechanism for switching the hole from the state with pickling hole complete coincidence to the state with the flushing hole complete coincidence, pickling steam is switched a section of thick bamboo interception and can not continue the release, wash the water and also can not get into the pickling steam of pollution in the pickling cavity in the washing process, through the setting isolation pickling process and the washing process of switching a section of thick bamboo and switching hole, make pickling steam and the mutual noninterference each other of flushing water pollute, it is more convenient to use.

The utility model discloses further set up to: the rotary mechanism comprises a driving shaft which is rotatably connected to the top surface of the cleaning platform and is vertical to the axis, the driving shaft corresponds to the switching cylinder and is in transmission connection with the switching cylinder through gear engagement, and a driving motor with an output end connected with the driving shaft is embedded in the cleaning platform.

Through adopting above-mentioned technical scheme, the user drives the drive shaft rotation through driving motor, and it is rotatory to drive the section of thick bamboo of switching through gear engagement, and the rotatory effectual and easy to carry out of control section of thick bamboo of switching.

The utility model discloses further set up to: the pressing device comprises an elastic piece which is fixed on the top surface of the cleaning platform and used for driving the same set of positioning blocks to relatively slide, and a shifting piece which is used for driving the positioning blocks to slide is fixed on the positioning blocks.

Through adopting above-mentioned technical scheme, the user slides the locating piece along the direction of keeping away from the bracing piece to the locating piece afterburning through grabbing the plectrum, and the locating piece is loosened after placing and clearing up the pipe, and the locating piece is cleared up the pipe towards under the elastic drive of elastic component and is slided and clear up the periphery lateral wall butt of pipe, presss from both sides tightly effectually and presss from both sides tight easy operation.

The utility model discloses further set up to: the top of the supporting rod is sequentially fixed with a Y-shaped support and a suspension ring, the Y-shaped branch end of the support is respectively fixed with two ends of the bottom surface of the suspension ring, and the suspension ring is abutted against the bottom of the inner wall of the digestion tube.

Through adopting above-mentioned technical scheme, the setting up of unsettled ring makes to clear up the further increase in clearance between deepest and the bracing piece of inside pipe wall, washes and contacts with clearing up the pipe in getting into this clearance more easily with sour steam, and area of contact is bigger, and the effect that the pipe was cleared up in the washing is better.

The utility model discloses further set up to: the suspension ring is coated with a fluororubber layer.

Through adopting above-mentioned technical scheme, fluororubber is high temperature resistant corrosion-resistant and elasticity is splendid, can be so that unsettled ring has certain flexibility to the support of clearing up the pipe, and effectively prevents the dangling ring and clear up the frictional wear between the ring, more facilitates the use.

To sum up, the utility model discloses a beneficial technological effect does:

1. the digestion pipe is fixed on the cleaning platform, so that the digestion pipe is prevented from being displaced in the water flow flushing process, the cleaning efficiency is higher, and the probability of damage of the digestion pipe caused by the cleaning process is reduced;

2. the acid steaming solution and the washing water are not polluted by each other because the switching cylinder and the switching hole, and the problem that the washing water contains acidic impurities and cannot be washed cleanly can not occur during washing.

Drawings

Fig. 1 is a schematic diagram of the overall structure of the present invention (including digestion tubes).

Fig. 2 is a partially enlarged schematic view of a portion a in fig. 1.

Fig. 3 is a sectional view (including a digestion tube) of the internal structure of the acid storage box according to the present invention.

Fig. 4 is a sectional view (containing a digestion tube) of the present invention directed to the internal structure of the water conducting cavity.

Fig. 5 is a partially enlarged schematic view of a portion B in fig. 4.

Fig. 6 is a sectional view of the internal structure of the pickling cavity according to the present invention.

In the figure, 1, an acid containing box; 11. heating plates; 2. cleaning the platform; 21. collecting tank; 22. a liquid discharge port; 3. a support bar; 31. a support; 32. a suspension ring; 321. a fluororubber layer; 4. pickling the cavity; 41. washing the hole with acid; 5. a water conducting cavity; 51. flushing the hole; 52. cleaning the pump; 53. a water storage tank; 6. positioning blocks; 61. a shock-absorbing layer; 62. an elastic member; 63. a shifting sheet; 7. switching the cylinder; 71. a switching hole; 72. a drive shaft; 721. a drive motor; 8. and (4) digesting the tube.

Detailed Description

The present invention will be described in further detail with reference to the accompanying fig. 1 to 6.

Referring to fig. 1 and 3, for the utility model discloses a belt cleaning device of pipe is cleared up to COD water quality analyzer, including inside cavity and top surface open-ended flourishing sour box 1, flourishing sour box 1 intussuseption is filled with pickling solution, and the bottom of flourishing sour box 1 inlays and is equipped with hot plate 11 that is used for heating pickling solution. The top surface of the acid containing box 1 is detachably fixed with a cleaning platform 2, and the area of the bottom surface of the cleaning platform 2 is larger than that of the top surface of the acid containing box 1. And the cleaning platform 2 is arranged in a step shape, and the side length of the top surface of the cleaning platform 2 is smaller than that of the bottom surface of the cleaning platform 2. The top surface of the cleaning platform 2 is fixed with a plurality of supporting rods 3 for supporting the inverted digestion tubes 8, referring to fig. 6, acid cleaning cavities 4 are arranged in the supporting rods 3, the acid cleaning cavities 4 extend to the outside of the cleaning platform 2 through the bottom ends and are positioned in the acid containing box 1 to be communicated with the acid containing box 1, and a plurality of acid cleaning holes 41 communicated with the inside of the acid cleaning cavities 4 and the outside of the supporting rods 3 are arranged on the supporting rods 3. Referring to fig. 2, the cleaning platform 2 is horizontally connected with L-shaped positioning blocks 6 in a sliding manner along a direction perpendicular to the axis of the support rod 3, two positioning blocks 6 are in a group, and each group of positioning blocks 6 is arranged corresponding to one support rod 3. The locating piece 6 of the same group uses the axis of bracing piece 3 to set up in the both sides of bracing piece 3 as the symmetry line symmetry, and the terminal surface that the locating piece 6 of the same group is close to each other is the L shape ladder face of locating piece 6, and the L shape ladder face of locating piece 6 is cleared up tub 8 with the bottom butt of clearing up tub 8 of inversion and built on stilts, is provided with closing device on the top surface of cleaning platform 2 and supplies the horizontal slip of user control locating piece 6. Cleaning platform 2 is last to be provided with washing unit and to supply the user to spray water and wash in the pipe 8 of clearing up of inverting, is provided with the collecting vat 21 that is used for collecting washing waste water on cleaning platform 2's the annular ladder face. The collecting tank 21 is arranged in a shape of a circle around the side line of the cleaning platform 2, and a liquid outlet 22 for discharging cleaning wastewater is arranged on the collecting tank 21.

The user will clear up pipe 8 and invert and overlap on bracing piece 3, clears up and have the interval between the bottom of pipe 8 and the top surface of cleaning platform 2 this moment, drives through closing device that locating piece 6 is close to each other and slides to the L shape ladder face of locating piece 6 and clear up the bottom of pipe 8 and clear up the outer wall butt of pipe 8, will clear up pipe 8 and fix on cleaning platform 2 through locating piece 6 to the packing force and the frictional force of clearing up pipe 8. The pickling solution is heated to pickling steam by the heating plate 11, and the pickling steam automatically enters the pickling cavity 4 due to the rising principle of hot air and passes through the pickling holes 41 to contact the digestion tubes 8. After the acid steaming is finished, the flushing work of the interior of the digestion pipe 8 is realized by spraying water flow into the digestion pipe 8 through the flushing device, the digestion pipe 8 cannot be separated from the support rod 3 because the positioning block 6 is tightly pressed and fixed, the support rod 3 cannot be impacted, wastewater flows into the collecting tank 21 under the action of gravity and can be discharged from the liquid discharge port 22, and the cleaning is convenient.

Referring to fig. 2, in order to increase the friction force between the positioning block 6 and the digestion tube 8 and protect the outer surface of the digestion tube 8, a shock-absorbing layer 61 is fixed on the opposite surface of the positioning block 6 of the same group, and the shock-absorbing layer 61 is made of fluororubber and completely covers the L-shaped stepped surface of the positioning block 6. Fluororubber resists strong acid and high temperature and elasticity is splendid, can effectively prevent locating piece 6 and clear up wearing and tearing each other between the pipe 8 in the increase frictional force, and can not receive the corruption of pickling steam, long service life.

Referring to fig. 1 and 6, in order to increase the contact area of the pickling steam and the washing water stream with the digestion tubes 8, a Y-shaped bracket 31 and a suspension ring 32 are sequentially fixed to the top of the support rod 3, and the axis of the suspension ring 32 is vertical and coincides with the axis of the support rod 3. The Y-shaped branch ends of the bracket 31 are respectively fixed with two ends of the bottom surface of the suspension ring 32, the suspension ring 32 is abutted against the bottom of the inner wall of the digestion tube 8, and the suspension ring 32 is coated with a fluororubber layer 321. The provision of the suspension rings 32 further increases the gap between the digestion tube 8 and the support rod 3, so that the contact area of the pickling steam and the flushing water stream with the digestion tube 8 is larger. When effectively softening and getting rid of and slaking the adnexed sediment reactant of bottom in the pipe 8, have fluororubber layer 321 to avoid slaking pipe 8 inner wall wearing and tearing, the cleaning performance is better.

Referring to fig. 2, the pressing device includes an elastic member 62 fixed on the top surface of the cleaning platform 2, and the elastic member 62 is a hard spring. The hard spring is arranged corresponding to the positioning blocks 6, one end of the hard spring is fixed with the cleaning platform 2, the other end of the hard spring is fixed with the positioning blocks 6, and the two positioning blocks 6 are driven by the elastic force of the hard spring to mutually approach and slide. A shifting piece 63 which is convenient for a user to apply force to the positioning block 6 is fixed on the positioning block 6, and the shifting piece 63 is arranged on one side of the positioning block 6 which is far away from each other. Be fixed with buffer layer 61 on the L shape ladder face that the same group locating piece 6 is relative, buffer layer 61 adopts fluororubber to make and buffer layer 61 tightly dispels pipe 8 when the locating piece 6 presss from both sides tightly and dispels pipe 8 butt. The user grabs and holds the manual locating piece 6 that slides of plectrum 63 and loosens plectrum 63 after placing and clear up pipe 8, locating piece 63 is close to each other under the elastic drive of elastic component 62 and slides to pressing from both sides tightly and clears up pipe 8, will clear up pipe 8 and fix on clean platform 2 through locating piece 6 and the frictional force and the packing force of clearing up between the pipe 8, and have buffer layer 61 to avoid the locating piece 6 damage to clear up the surface quality of pipe 8, and increase the frictional force of fixed usefulness, easy to carry out and fixed effectual.

Referring to fig. 4 and 6, the flushing device comprises a water guide cavity 5 arranged in the support rod 3, the cross-sectional shapes of the water guide cavity 5 and the pickling cavity 4 in the horizontal plane are both circular, and the number of the water guide cavity 5 and the pickling cavity 4 is two and is staggered around the axis of the support rod 3. Referring to fig. 5, the support rod 3 is provided with a plurality of flushing holes 51 communicating the outside of the support rod 3 with the inside of the water guide cavity 5, each water guide cavity 5 is arranged corresponding to a group of flushing holes 51, and the flushing holes 51 of the same group are arranged in a linear array along the bus direction of the support rod 3. The water guide cavity 5 is sequentially connected with a cleaning pump 52 and a water storage tank 53 through pipe connection, the input end of the cleaning pump 52 is connected with the water storage tank 53 and drives water in the water storage tank 53 to sequentially pass through the water guide cavity 5 and the flushing hole 51 and to be sprayed towards the digestion pipe 8. Each pickling cavity 4 is arranged corresponding to one group of pickling holes 41, and the pickling holes 41 in the same group are arranged in a linear array along the bus direction of the support rod 3.

The inner diameters of the pickling holes 41 and the flushing holes 51 are equal, and the pickling holes 41 and the flushing holes 51 are staggered in groups around the axis of the support rod 3. The supporting rod 3 is rotatably connected with a switching cylinder 7 coaxial with the supporting rod 3, the inner diameter of the switching cylinder 7 is equal to the outer diameter of the supporting rod 3, and the rotating surface of the switching cylinder 7 is perpendicular to the axis of the supporting rod 3. The switching cylinder 7 is provided with switching holes 71 having the same inner diameter as the flushing holes 51, the number of the switching holes 71 is two, and the switching holes 71 of the same group are arranged in a linear array in the direction of the supporting shaft generatrix. The cleaning platform 2 is provided with a rotating mechanism for a user to drive the switching cylinder 7 to rotate, and the switching hole 71 can only be coincided with the flushing hole 51 alone or the switching cylinder 7 in the rotating process of the switching cylinder 7.

When the user acid-evaporates the digestion tubes 8, all the switching holes 71 coincide with all the pickling holes 41, and pickling steam can sequentially pass through the pickling holes 41 and the switching holes 71 to contact the digestion tubes 8. After the acid steaming is completed, the user drives the switching cylinder 7 to rotate by the rotating device to a position where the switching hole 71 is completely staggered with the pickling hole 41 and the switching hole 71 is completely overlapped with the washing hole 51. The water in the water storage tank 53 is pressurized by the washing pump 52 so that the washing water is sequentially sprayed through the water guide cavity 5 and the washing holes 51 toward the inner wall of the digestion tube 8, thereby completing the washing work. The washing water can not enter the pickling cavity 4, the pickling steam can not enter the water guide cavity 5, the pollution is avoided, the cleaning is convenient, and the cleaning effect is good.

Referring to fig. 1 and 4, the rotating mechanism includes a drive shaft 72 rotatably connected to the top surface of the cleaning platform 2, the axis of the drive shaft 72 is vertical and the top end is located outside the cleaning platform 2, and the bottom end of the drive shaft 72 extends into the cleaning platform 2. The cleaning platform 2 is embedded with a driving motor 721 with an output end fixed with the bottom end of the driving shaft 72, and the driving shaft 72 is in transmission connection with the switching cylinder 7 through gear engagement. The user controls the driving shaft 72 to rotate through the driving motor 721, and drives the switching barrel 7 to rotate through gear meshing transmission, so that the control is convenient and the operation is simple.

The implementation principle of the embodiment is as follows: the user sleeves the digestion tube 8 on the support rod 3, manually slides the positioning block 6 to the digestion tube 8 to move downwards until the bottom end of the digestion tube 8 is abutted against the positioning block 6, loosens the positioning block 6, the positioning block 6 mutually approaches to and slides to press the outer wall of the digestion tube 8 under the elastic drive of the elastic piece 62, at the moment, the damping layer 61 is abutted against the digestion tube 8, after the digestion tube 8 is acid-steamed by the pickling steam flowing out of the pickling hole 41, the driving shaft 72 is driven to rotate by the driving motor 721, the switching cylinder 7 is driven to rotate by gear engagement until the flushing hole 51 is superposed with the switching hole 71, the digestion tube 8 is flushed by the water flow sprayed from the flushing hole 51, the cleaning is convenient and the cleaning effect is good, the digestion tube 8 cannot be displaced due to the pressing force between the positioning block 6 and the digestion tube 8 and the friction force between the damping layer 61 and the digestion tube 8, the digestion tube 8 is not easy to be, is convenient to use.

The embodiment of this specific implementation mode is the preferred embodiment of the present invention, not limit according to this the utility model discloses a protection scope, so: all equivalent changes made according to the structure, shape and principle of the utility model are covered within the protection scope of the utility model.

Claims (8)

1. The utility model provides a COD water quality analyzer clears up belt cleaning device of pipe, including being used for bearing pickling solution and open-top hold sour box (1) and can dismantle the cleaning platform (2) of stairstepping of being connected with the top surface that holds sour box (1), be provided with bracing piece (3) that a plurality of is used for supporting to clear up pipe (8), its characterized in that on the top surface of cleaning platform (2): the bottom of the acid containing box (1) is embedded with a heating plate (11) for heating acid washing solution, an acid washing cavity (4) communicated with the acid containing box (1) is arranged in the supporting rod (3), a plurality of acid washing holes (41) for discharging acid washing steam in the acid washing cavity (4) are arranged on the supporting rod (3), positioning blocks (6) in an L shape are horizontally slidably connected on the cleaning platform (2) along the direction vertical to the axis of the supporting rod (3), the two positioning blocks (6) are in a group, each positioning block (6) is symmetrically arranged on two sides of the corresponding supporting rod (3) in a state with opposite bending directions, a pressing device for controlling the horizontal sliding of the positioning blocks (6) is arranged on the top surface of the cleaning platform (2), a flushing device for spraying flushing water flow into the digestion tube (8) is arranged on the cleaning platform (2), an annular collecting groove (21) is formed in the annular step surface of the cleaning platform (2), and a liquid outlet (22) is formed in the collecting groove (21).
2. 2. The cleaning device for the digestion tube of the COD water quality analyzer according to claim 1, which is characterized in that: and shock absorbing layers (61) made of fluororubber are fixed on the opposite surfaces of the positioning blocks (6) in the same group.
3. 3. The cleaning device for the digestion tube of the COD water quality analyzer according to claim 2, characterized in that: the flushing device comprises a water guide cavity (5) arranged in a supporting rod (3), the water guide cavity (5) is communicated with a plurality of flushing holes (51) extending to the outside of the supporting rod (3), the flushing holes (51) are arranged along the bus direction linear array of the supporting rod (3), the water guide cavity (5) is connected with a water storage tank (53) through a pipeline, and a cleaning pump (52) used for driving water in the water storage tank (53) to sequentially flush the digestion pipe (8) through the water guide cavity (5) and the flushing holes (51) is connected onto the water storage tank (53).
4. 4. The cleaning device for the digestion tube of the COD water quality analyzer according to claim 3, characterized in that: the quantity of the water guide cavities (5) and the pickling cavities (4) is a plurality of, the water guide cavities and the pickling cavities are arranged around the axis of the supporting rod (3) in a staggered mode, pickling holes (41) communicated with the single pickling cavity (4) are arranged in a linear array mode along the bus direction of the supporting rod (3) and are as high as adjacent flushing holes (51), the supporting rod (3) is rotatably connected with a switching barrel (7) which is coaxial with the supporting rod (3) and is sleeved on the supporting rod (3), the switching barrel (7) is provided with a plurality of switching holes (71), the diameters of the switching holes (71), the flushing holes (51) and the pickling holes (41) are equal, the pickling holes (41) and the switching holes (71) are completely staggered when the switching holes (71) and the flushing holes (51) are completely superposed, and the flushing holes (51) and the switching holes (71) are completely staggered when the switching holes (71) and the pickling holes (41) are completely superposed, and a rotating mechanism for controlling the switching cylinder (7) to rotate is arranged on the cleaning platform (2).
5. 5. The cleaning device for the digestion tube of the COD water quality analyzer according to claim 4, characterized in that: the rotary mechanism comprises a driving shaft (72) which is rotatably connected to the top surface of the cleaning platform (2) and is vertical to the axis, the driving shaft (72) is arranged corresponding to the switching cylinder (7) and is in transmission connection with the switching cylinder (7) through gear engagement, and a driving motor (721) with an output end connected with the driving shaft (72) is embedded in the cleaning platform (2).
6. 6. The cleaning device for the digestion tube of the COD water quality analyzer according to claim 5, characterized in that: the pressing device comprises an elastic piece (62) which is fixed on the top surface of the cleaning platform (2) and used for driving the same set of positioning blocks (6) to relatively slide, and a shifting piece (63) which is used for driving the positioning blocks (6) to slide is fixed on the positioning blocks (6).
7. 7. The cleaning device for the digestion tube of the COD water quality analyzer according to claim 1, which is characterized in that: the top of the supporting rod (3) is sequentially fixed with a Y-shaped support (31) and a suspension ring (32), the Y-shaped forked end of the support (31) is fixed with two ends of the bottom surface of the suspension ring (32) respectively, and the suspension ring (32) is abutted against the bottom of the inner wall of the digestion tube (8).
8. 8. The cleaning device for the digestion tube of the COD water quality analyzer according to claim 7, characterized in that: the suspension ring (32) is coated with a fluorine rubber layer (321).

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