CN219621182U - Dosing device and microbial reaction equipment - Google Patents

Abstract

The utility model provides a dosing device and microbial reaction equipment, and relates to the field of dosing equipment. The dosing device comprises a dosing box body and a mixing box body, wherein a front liquid medicine box, a liquid medicine feeding pump and an electric three-way valve are arranged in the dosing box body, the front liquid medicine box is communicated with the liquid medicine feeding pump, a feeding port of the electric three-way valve is communicated with an outlet of the liquid medicine feeding pump, a first discharging port of the electric three-way valve is communicated with the mixing box body, a second discharging port of the electric three-way valve is communicated with the front liquid medicine box, one of the first discharging port and the second discharging port is opened, a first liquid level meter for driving the second discharging port to be opened when a low liquid level is arranged in the front liquid medicine box, and a second liquid level meter for driving the first discharging port to be opened is arranged in the mixing box body. The utility model can realize the pre-dissolution of the medicine powder and the water in the front-end medicine liquid box, the mixed medicine liquid can supplement medicine into the mixing box or return to the front-end medicine liquid box to realize self-circulation, and the self-circulation can realize the stirring and the full dissolution of the medicine liquid.

Description

Dosing device and microbial reaction equipment

Technical Field

The utility model relates to the field of dosing equipment, in particular to a dosing device and microbial reaction equipment.

Background

At present, when microorganisms are cultured, liquid medicine needs to be added into a microorganism culture tank, wherein the liquid medicine is formed by mixing powder and water, when a conventional dosing device is operated, a water inlet electromagnetic valve is automatically opened to feed water, a flowmeter automatically detects the water inlet amount on line, a microprocessor automatically controls the addition of powdery medicament according to the actual water inlet amount and preset preparation concentration, and the powdery medicament is dissolved at a medicament outlet by annular hydraulic power. After the water and the medicament enter the mixing box body, the stirrer automatically stirs, so that the medicament and the water are further completely dissolved. A liquid level meter is arranged in the mixing box body, the water inflow is automatically controlled according to the liquid level, and meanwhile, the operation of the dosing pump is automatically controlled. However, the traditional medicine adding mode can lead to insufficient dissolution of the medicine liquid and poor concentration stability of the medicine liquid.

In view of this, the present utility model has been made.

Disclosure of Invention

The utility model aims to provide a dosing device, which can realize self-circulation stirring and mixing under the condition of no stirrer through a front liquid medicine box in a dosing box body, and can be dissolved in advance so that liquid medicine in a subsequent mixing box body is easier to uniformly mix.

The utility model aims to provide microbial reaction equipment, the liquid medicine of which is uniformly mixed and is convenient to add.

Embodiments of the present utility model are implemented as follows:

in a first aspect, the utility model provides a dosing device, which comprises a dosing box body and a mixing box body, wherein a front liquid medicine box, a liquid medicine feeding pump and an electric three-way valve are arranged in the dosing box body, the front liquid medicine box is provided with a medicine powder inlet, a solvent inlet, a circulating hole pipe and a mixed liquid medicine outlet, the mixed liquid medicine outlet is communicated with the liquid medicine feeding pump, a feeding hole of the electric three-way valve is communicated with an outlet of the liquid medicine feeding pump, a first discharging hole of the electric three-way valve is communicated with the mixing box body, a second discharging hole of the electric three-way valve is communicated with the circulating hole pipe, one of the first discharging hole and the second discharging hole is opened, a first liquid level meter used for driving the second discharging hole to be opened when the liquid level in the front liquid medicine box is a low liquid level is arranged in the mixing box body, and a second liquid level meter used for driving the first discharging hole to be opened when the liquid level in the mixing box body is a medium liquid level is arranged in the mixing box body.

In an alternative embodiment, the circulating hole pipe is arranged at the bottom of the preposed medicine liquid tank, and the circulating hole pipe is a pipe fitting with two ends closed and a middle opening.

In an alternative embodiment, the front-end medicine liquid box is further provided with a guide plate for pre-flushing the medicine powder by the solvent, and the medicine powder inlet and the solvent inlet are corresponding to the guide plate.

In an alternative embodiment, a solenoid valve is arranged at the solvent inlet, and the first liquid level meter is in signal connection with the solenoid valve.

In an alternative embodiment, the medicine adding box body is further provided with a medicine powder storage box and a screw conveyer, the screw conveyer is obliquely arranged, a discharge hole of the medicine powder storage box is communicated with a feed inlet of the screw conveyer, and a discharge hole of the screw conveyer is communicated with a medicine powder inlet.

In an alternative embodiment, a level switch and a vibrator are further arranged in the medicine powder storage box, and the vibrator is mounted on the outer side wall of the medicine powder storage box.

In an alternative embodiment, the screw conveyer comprises a speed reducer, a spiral dragon and a conveying charging barrel, wherein the spiral dragon is installed in the conveying charging barrel and driven by the speed reducer, a charging port flange and a charging barrel discharging port are arranged on the conveying charging barrel, a discharging port of the powder storage box is communicated with the charging port flange, a powder inlet is communicated with the charging barrel discharging port, and the speed reducer is a variable frequency motor.

In an alternative embodiment, two liquid medicine adding pumps are switched to run, and filters are arranged at the inlets of the two liquid medicine adding pumps.

In an alternative embodiment, be provided with one-level stirring mixing box, second grade stirring mixing box and nutrient solution in the mixing box and throw the pump, the liquid medicine throw the discharge gate of pump with the feed inlet intercommunication of one-level stirring mixing box, the top of one-level stirring mixing box with second grade stirring mixing box intercommunication, the nutrient solution throw the pump with the discharge gate intercommunication of second grade stirring mixing box, the second level gauge set up in the second grade stirring mixing box.

In a second aspect, the present utility model provides a microbial reaction apparatus comprising a culture tank and a dosing device according to any one of the preceding embodiments, the mixing tank of the dosing device being in communication with the culture tank.

The embodiment of the utility model has the beneficial effects that:

according to the medicine adding device provided by the utility model, the pre-dissolving of medicine powder and water in the pre-liquid medicine box can be realized through the arrangement of the pre-liquid medicine box, and meanwhile, the medicine supplementing of mixed liquid medicine into the mixing box body or the self-circulation of the mixed liquid medicine returned into the pre-liquid medicine box can be realized through the cooperation of the electric three-way valve, the first liquid level meter and the second liquid level meter, so that the stirring of the liquid medicine can be realized through the self-circulation, and the liquid medicine can be fully dissolved under the condition that a stirrer is not used in the pre-liquid medicine box. The microorganism reaction equipment provided by the utility model can be used for adding the medicine to the culture tank by using the medicine adding device, so that the microorganisms in the culture tank can be cultured conveniently, and the added mixed medicine liquid is constant in concentration and good in uniformity, and is beneficial to culturing the microorganisms.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present utility model and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural view of a drug adding device according to an embodiment of the present utility model;

FIG. 2 is a schematic cross-sectional view of a drug delivery device according to an embodiment of the present utility model;

FIG. 3 is a process flow diagram of a dosing device according to an embodiment of the present utility model;

fig. 4 is a schematic structural view of a screw conveyor of a dosing device according to an embodiment of the present utility model;

fig. 5 is a partial enlarged view at a in fig. 4.

Icon: 100-a dosing device; 101-a dosing box body; 102-a mixing box; 110-a medicine powder storage box; 111-level switch; 112-a vibrator; 120-screw conveyor; 121-a speed reducer; 1211-a speed reducer mount; 122-spiral dragon; 123-conveying a charging barrel; 1231-a feed inlet flange; 1232-a discharge port of the charging barrel; 1233-cartridge flange; 124-a stop washer; 125-round nuts; 126-a seated bearing; 1261-bearing mount; 127-oil seal; 128-A type sealing rings; 130-a front-end liquid medicine tank; 131-powder inlet; 132—solvent inlet; 133-circulating hole pipe; 134-mixed liquor outlet; 135-deflector; 136-solenoid valve; 137-a first level gauge; 140-adding a liquid medicine pump; 141-a filter; 150-an electric three-way valve; 160-a primary stirring mixing box; 161-stirring motor; 162-stirrer; 163-filtering net; 170-a secondary stirring and mixing box; 171-a second level gauge; 180-adding a nutrient solution into a pump; 181-manual valve.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model. The components of the embodiments of the present utility model generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the utility model, as presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.

In the description of the present utility model, it should be noted that, directions or positional relationships indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., are directions or positional relationships based on those shown in the drawings, or are directions or positional relationships conventionally put in use of the inventive product, are merely for convenience of describing the present utility model and simplifying the description, and are not indicative or implying that the apparatus or element to be referred to must have a specific direction, be constructed and operated in a specific direction, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal," "vertical," and the like do not denote a requirement that the component be absolutely horizontal or overhang, but rather may be slightly inclined. As "horizontal" merely means that its direction is more horizontal than "vertical", and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present utility model, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

Examples

Referring to fig. 1, 2 and 3, the present embodiment provides a dosing device 100, which includes a dosing tank 101 and a mixing tank 102, wherein the dosing tank 101 is used for mixing medicinal powder and water in proportion, and the mixing tank 102 is used for fully stirring and fully dissolving the mixed medicinal liquid.

In this embodiment, a medicine powder storage tank 110, a screw conveyor 120, a front-mounted medicine liquid tank 130, a medicine liquid feeding pump 140, and an electric three-way valve 150 are provided in the medicine feeding box 101.

The powder bin 110 is a hopper type structure for storing powder, a material level switch 111 and a vibrator 112 are further arranged in the powder bin 110, the material level switch 111 is arranged at a bottom discharge hole of the powder bin 110, and can detect the material level of the powder, and the powder is warned to be supplemented when the powder is in shortage. Vibrator 112 is installed on the lateral wall of powder bin 110, and vibrator 112's setting can keep the smoothness of ejection of compact in the powder transportation process.

Referring to fig. 4 and 5, the screw conveyor 120 is used for conveying medicine powder, a discharge port of the medicine powder storage tank 110 is communicated with a feed port of the screw conveyor 120, and a discharge port of the screw conveyor 120 is communicated with a medicine powder inlet 131 of the front medicine liquid tank 130. The powder is discharged from the discharge port of the powder storage tank 110 and quantitatively delivered into the front medicine liquid tank 130 via the screw conveyor 120.

Specifically, in this embodiment, the screw conveyer 120 includes a speed reducer 121, a spiral dragon 122 and a conveying cylinder 123, the spiral dragon 122 is installed in the conveying cylinder 123 and driven by the speed reducer 121, a feed port flange 1231 and a cylinder discharge port 1232 are disposed on the conveying cylinder 123, a discharge port of the powder storage box 110 is communicated with the feed port flange 1231, a powder inlet 131 is communicated with the cylinder discharge port 1232, and the speed reducer 121 is a variable frequency motor. The medicine powder enters the feeding cylinder 123 from the feeding port flange 1231, and the speed reducer 121 drives the spiral dragon 122 to rotate so as to convey the medicine powder to the discharging port 1232 of the feeding cylinder. The speed reducer 121 is fixed on the speed reducer fixing part 1211, one end of the spiral dragon 122 is locked with the speed reducer 121 by using a stop washer 124 and a round nut 125, two ends of the conveying charging barrel 123 are connected with charging barrel flanges 1233, two ends of the spiral dragon 122 are provided with bearing seats 126, the bearing seats 126 at two ends are respectively fixed on the bearing fixing part 1261 and the speed reducer fixing part 1211, an oil seal 127 and an A-shaped sealing ring 128 are adopted between the conveying charging barrel 123 and the bearing fixing part 1261, and the sealing performance of the medicine powder conveying in the conveying charging barrel 123 is improved. The speed reducer 121 is a variable frequency motor, and can control the feeding amount of the screw conveyor 120 through frequency and control the feeding amount through setting the frequency running time, so as to add the medicine powder into the front medicine liquid box 130 at fixed time and fixed quantity. In the utility model, the screw conveyor 120 is obliquely arranged, so that the occupied space at the top of the box body of the dosing device 100 can be saved, the manual dosing of medicine powder is more convenient, the maintenance is more convenient, and the appearance is greatly improved.

Referring back to fig. 1, 2 and 3, the front-end medicine tank 130 is used to achieve preliminary mixing of medicine powder and solvent (e.g., water), and specifically, in the present utility model, the front-end medicine tank 130 is provided with a medicine powder inlet 131, a solvent inlet 132, a circulation hole pipe 133, a mixed medicine liquid outlet 134 and a baffle 135.

Wherein, the powder inlet 131 is communicated with the discharge hole 1232 of the charging barrel of the screw conveyor 120, the solvent inlet 132 is communicated with the water pipe, the powder inlet 131 and the solvent inlet 132 are corresponding to the guide plate 135, the powder enters from the powder inlet 131 and falls onto the guide plate 135, the solvent enters from the solvent inlet 132 and falls onto the guide plate 135, and the solvent falling onto the guide plate 135 can perform the pre-scouring and pre-mixing functions on the powder on the guide plate 135. The medicine powder and the solvent are mixed in the preposed medicine liquid tank 130 to form mixed medicine liquid, the mixed medicine liquid outlet 134 is communicated with the medicine liquid adding pump 140, the mixed medicine liquid is discharged from the mixed medicine liquid outlet 134 to the medicine liquid adding pump 140, two medicine liquid adding pumps 140 are switched to run, the inlets of the two medicine liquid adding pumps 140 are provided with filters 141, the filters 141 are communicated with the inlets of the medicine liquid adding pumps 140, and the filters are arranged on the inner side of the medicine adding tank 101.

The electric three-way valve 150 is used for realizing that the mixed liquid medicine led out by the liquid medicine feeding pump 140 is fed to different positions according to different requirements.

Specifically, the inlet of the electric three-way valve 150 is communicated with the outlet of the liquid medicine adding pump 140, the first outlet of the electric three-way valve 150 is communicated with the mixing box 102, the second outlet is communicated with the circulation hole pipe 133, and one of the first outlet and the second outlet is opened.

In this embodiment, a first level gauge 137 is provided in the front-end liquid medicine tank 130, and a second level gauge 171 is provided in the mixing tank 102. The first liquid level meter 137 may drive the second discharge port to open when the liquid level in the front liquid medicine tank 130 is a low liquid level, the second liquid level meter 171 may drive the first discharge port to open when the liquid level in the mixing tank 102 is a medium liquid level, the electromagnetic valve 136 is disposed at the solvent inlet 132, and the first liquid level meter 137 is in signal connection with the electromagnetic valve 136.

It should be understood that the term "low level" in the present utility model refers to a level at which the volume of solution in the tank is 20-30% of the volume contained in the tank; the medium liquid level is the medium liquid level, wherein the volume of the solution in the box body is 45-55% of the accommodating volume of the box body; "minimum level" refers to the level at which the volume of solution in the tank is less than 10% of the tank holding volume; "maximum level" means the level at which the volume of solution in the tank is greater than 90% of the volume contained in the tank; "quantitative level" refers to the level at which the volume of solution in the tank is equal to a certain quantitative value of the tank holding volume, for example, at a high/low level of 40L below the highest level and above the lowest level.

When the first level gauge 137 detects that the liquid level in the front-end liquid medicine tank 130 is at the "lowest liquid level" or the "highest liquid level", the first level gauge 137 triggers an alarm to alarm and stop. When the first liquid level meter 137 detects that the liquid level in the front liquid medicine tank 130 is at the low liquid level, the first liquid level meter 137 drives the second discharge port to be opened, the first discharge port is closed, and the mixed liquid medicine realizes self circulation at the moment. When the first liquid level meter 137 detects that the liquid level in the front liquid medicine tank 130 is at the quantitative liquid level, the first liquid level meter 137 drives the electromagnetic valve 136 to close to stop water adding, the first liquid level meter 137 drives the second discharging port to open, the first discharging port is closed, the mixed liquid medicine realizes self circulation at the moment, and the electric three-way valve 150 is in a closed state to wait for the next switching signal. When the second liquid level gauge 171 detects that the liquid level in the mixing tank 102 is a medium liquid level, the first discharge port is opened, and the second discharge port is closed, so that the mixed liquid medicine is fed into the mixing tank 102.

When the mixed liquor is self-circulated, the second discharging port is communicated with the circulating hole pipe 133, and the mixed liquor is fed into the front liquor box 130 through the circulating hole pipe 133. The circulation hole pipe 133 can enable the circulating liquid medicine to enter from the bottom, and is beneficial to playing a role of mixing and stirring.

In the present utility model, the baffle 135 and the circulation hole pipe 133 provided in the front-end liquid medicine tank 130 can pre-mix the liquid medicine and water in the front-end liquid medicine tank 130 at the top and enhance the mixing at the bottom, thereby realizing more sufficient dissolution of the liquid medicine and water in the front-end liquid medicine tank 130 without using a stirrer.

Since the powder can be quantitatively conveyed by the screw conveyor 120 and the solvent can be quantitatively fed by the cooperation of the first liquid level meter 137 and the electromagnetic valve 136, the water and the powder are both quantitatively and continuously mixed, and the concentration of the liquid medicine can be stable.

The mixing tank 102 may be one tank, or a plurality of tanks may be connected in series in order to perform multistage mixing. In the present utility model, it is preferable that a primary stirring and mixing tank 160, a secondary stirring and mixing tank 170 and a nutrient solution adding pump 180 are provided in the mixing tank 102, a discharge port of the chemical solution adding pump 140 is connected to a feed port of the primary stirring and mixing tank 160, a top of the primary stirring and mixing tank 160 is connected to the secondary stirring and mixing tank 170, the nutrient solution adding pump 180 is connected to a discharge port of the secondary stirring and mixing tank 170, and a second level gauge 171 is provided in the secondary stirring and mixing tank 170.

The primary stirring and mixing box 160 and the secondary stirring and mixing box 170 are internally provided with a stirring motor 161 and a stirrer 162, and the stirring motor 161 drives the stirrer 162 to move so as to realize stirring. An outlet communicating with the secondary stirring and mixing tank 170 is provided at the top of the primary stirring and mixing tank 160, and a filter screen 163 is provided at the outlet. The mixed liquid medicine finally enters the secondary stirring and mixing box 170 in an overflow mode through the filter screen 163 after being stirred by the primary stirring and mixing box 160, the filter screen 163 can enable incomplete dissolution or the particulate matters can not be subjected to the next stage, and the filtered liquid medicine enters the secondary stirring and mixing box 170 for stirring and mixing again, so that the concentration of the liquid medicine is more uniform.

The number of the nutrient solution adding pumps 180 is two, and the two nutrient solution adding pumps 180 are switched to work according to the set time. The liquid medicine in the secondary stirring and mixing box 170 is delivered to a subsequent culture tank through a nutrient solution adding pump 180. The liquid medicine fed by the nutrient solution feed pump 180 can be returned to the secondary stirring and mixing tank 170 by adjusting the manual valve 181. The device can be used for a plurality of groups of subsequent culture tanks, the nutrient solution feeding pump 180 stops after each period runs for a set time by taking a preset time period as a period, and the next period is waited for restarting.

Referring to fig. 1, 2 and 3, the working principle of the dosing device 100 is: the medicine powder is conveyed into the screw conveyor 120 from a discharge hole at the bottom of the medicine powder storage box 110, and is conveyed to the guide plate 135 of the front medicine liquid box 130 through the screw conveyor 120, water enters from a solvent inlet and washes the guide plate 135, mixed medicine liquid flows into the front medicine liquid box 130 along the guide plate 135 of the medicine liquid box, and the screw conveyor 120 conveys quantitative medicine powder and quantitative tap water to be mixed into medicine liquid with a certain concentration. The front-mounted liquid medicine tank 130 is connected with two liquid medicine feeding pumps 140, a filter 141 is arranged at the inlet of the liquid medicine feeding pump 140, the filtered liquid medicine is opened through the liquid medicine feeding pump 140 and an electric three-way valve 150 to be conveyed to the primary stirring mixing tank 160 or returned to the front-mounted liquid medicine tank 130, and the two liquid medicine feeding pumps 140 are switched to run according to set time. When the liquid level in the front liquid medicine tank 130 is low, the first liquid level meter 137 drives the second discharge port to be opened for self circulation, and when the liquid level in the secondary stirring and mixing tank 170 in the mixing tank 102 is medium, the second liquid level meter 171 drives the first discharge port to be opened for material supplementing. When the mixed liquor is self-circulated, the mixed liquor is fed into the front liquor tank 130 through the circulation hole pipe 133, which is advantageous for mixing and stirring. According to the utility model, the liquid medicine entering the primary stirring and mixing box 160 overflows into the secondary stirring and mixing box 170 after stirring, and is mixed again, so that a better mixing effect can be realized in a multi-stage mixing mode.

In addition, the present embodiment also provides a microbial reaction apparatus comprising a culture tank and the above-described dosing device 100, the mixing tank 102 of the dosing device 100 being in communication with the culture tank.

In summary, the drug adding device 100 provided by the utility model can realize that the drug powder and the water are dissolved in the front drug solution tank 130 in advance by arranging the front drug solution tank 130, and meanwhile, the electric three-way valve 150, the first liquid level meter 137 and the second liquid level meter 171 are matched to supplement the mixed drug solution into the mixing tank 102 or return the mixed drug solution into the front drug solution tank 130 to realize self circulation, and the self circulation can realize stirring of the drug solution, so that the drug solution can be fully dissolved in the front drug solution tank 130 under the condition of not using a stirrer. Meanwhile, in the utility model, the screw conveyor 120 is adopted to convey the medicinal powder, the first liquid level meter 137 is adopted to control the adding amount of water, so that the uniform and quantitative batch proportioning of the medicinal powder and the water can be realized, and the stable concentration of the medicinal liquid can be realized. In addition, the screw conveyor 120 is obliquely arranged, so that the occupied space at the top of the box body of the dosing device 100 can be saved, the manual dosing of medicine powder is more convenient, the maintenance is more convenient, and the appearance is greatly improved. In addition, the mixing box 102 is used for multi-stage mixing and dispensing, so that the medicine powder can be completely dissolved. The microorganism reaction equipment provided by the utility model can utilize the chemical adding device 100 to add chemical to the culture tank, is convenient for culturing microorganisms in the culture tank, has constant concentration and good uniformity of the added mixed chemical liquid, and is beneficial to culturing microorganisms.

The above description is only of the preferred embodiments of the present utility model and is not intended to limit the present utility model, but various modifications and variations can be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

Claims (10)

1. The utility model provides a dosing device, its characterized in that includes dosing box and mixing box, be provided with leading liquid medicine case, liquid medicine dosing pump and electronic three-way valve in the dosing box, leading liquid medicine case is provided with powder import, solvent import, circulation hole pipe, mixed liquid medicine export with the liquid medicine dosing pump intercommunication, the feed inlet of electronic three-way valve with the export intercommunication of liquid medicine dosing pump, the first discharge gate of electronic three-way valve with mixing box intercommunication, the second discharge gate with circulation hole pipe intercommunication, first discharge gate with one of them is opened of second discharge gate, be provided with in the leading liquid medicine case and be used for driving when leading liquid medicine incasement liquid level is low liquid level the first level gauge that the second discharge gate was opened, be provided with in the mixing box and be used for driving when the liquid level is well liquid level in the mixing box the second level gauge that the first discharge gate was opened.

2. The dosing device of claim 1, wherein the circulation port tube is disposed at the bottom of the pre-tank, and the circulation port tube is a tube with two ends closed and a central opening.

3. The drug delivery device of claim 1, wherein the pre-tank is further provided with a baffle for pre-flushing the drug powder with solvent, the drug powder inlet and the solvent inlet corresponding to the baffle.

4. The dosing device of claim 1, wherein the solvent inlet is provided with a solenoid valve, and the first level gauge is in signal connection with the solenoid valve.

5. The dosing device of claim 1, wherein a powder storage tank and a screw conveyor are further arranged in the dosing tank, the screw conveyor is obliquely arranged, a discharge port of the powder storage tank is communicated with a feed port of the screw conveyor, and a discharge port of the screw conveyor is communicated with the powder inlet.

6. The drug delivery device of claim 5, wherein a level switch and a vibrator are further provided in the drug powder storage box, the vibrator being mounted on an outer side wall of the drug powder storage box.

7. The dosing device of claim 5, wherein the screw conveyor comprises a speed reducer, a screw auger and a conveying charging barrel, the screw auger is installed in the conveying charging barrel and driven by the speed reducer, a charging port flange and a charging barrel discharging port are arranged on the conveying charging barrel, the discharging port of the powder storage box is communicated with the charging port flange, the powder inlet is communicated with the charging barrel discharging port, and the speed reducer is a variable frequency motor.

8. The dosing device of claim 1, wherein two liquid medicine dosing pumps are switched in operation, and filters are arranged at inlets of the two liquid medicine dosing pumps.

9. The dosing device according to any one of claims 1-8, wherein a primary stirring and mixing tank, a secondary stirring and mixing tank and a nutrient solution feeding pump are arranged in the mixing tank, a discharge port of the nutrient solution feeding pump is communicated with a feed port of the primary stirring and mixing tank, the top of the primary stirring and mixing tank is communicated with the secondary stirring and mixing tank, the nutrient solution feeding pump is communicated with a discharge port of the secondary stirring and mixing tank, and the second liquid level meter is arranged in the secondary stirring and mixing tank.

10. A microbial reaction apparatus comprising a culture tank and a dosing device according to any one of claims 1-9, said mixing tank of said dosing device being in communication with said culture tank.