CN217520529U - 4-BMA production is with concentrated cauldron of on-line measuring liquid level automatic control layering - Google Patents

Abstract

The utility model discloses a 4-BMA production is with concentrated cauldron of on-line measuring liquid level automatic control layering, including the cauldron body, press from both sides cover, layering board, opening, layering mechanism, upper steam exhaust pipe, lower floor's solenoid valve, lower floor's liquid level detector, upper liquid level detector and density detector. Liquid in the kettle body is continuously discharged in a steam form, so that the liquid level in the kettle body is gradually reduced, when the liquid level is reduced to be lower than a lower layer liquid level detector, a power push rod of a layering mechanism drives a sealing plug to descend to seal and seal an opening, so that an upper layer cavity is separated from a lower layer cavity, and meanwhile, a lower layer electromagnetic valve is electrified, so that steam in the lower layer cavity is discharged from a lower layer steam exhaust pipe, and at the moment, the space of the upper layer cavity can be utilized for feeding again to perform evaporation concentration operation, thereby realizing continuous operation, improving the concentration efficiency and improving the production efficiency of 4-BMA; the liquid concentration of the lower layer cavity is detected through the density detector, and when the liquid concentration of the lower layer cavity reaches a preset value, 4-BMA materials in the lower layer cavity can be automatically discharged.

Description

4-BMA production is with concentrated cauldron of on-line measuring liquid level automatic control layering

Technical Field

The utility model relates to a chemical industry equipment technical field, especially a 4-BMA production is with concentrated cauldron of on-line measuring liquid level automatic control layering.

Background

Meropenem, also known as meropenem, is one of important members of carbapenem antibiotics, has the characteristics of good chemical stability, stability to-beta lactamase and renal dehydropeptidase, and the like, has excellent treatment effect on severe and multiple drug-resistant bacterial infections such as respiratory tract infection, abdominal cavity infection, urinary tract infection, and the like, and is widely applied in the world at present and has wide market prospect.

At present, the synthesis method of meropenem mainly comprises the steps of firstly synthesizing (3S,4S) -4- [ (R) -1-carboxyethyl ] -3- [ (R) -1-isobutyldimethylsilyloxyethyl ] -2-azetidinone, namely 4-BMA, and then carrying out a series of reactions such as diazotization, deprotection, hydrogenation, refining and the like on the intermediate with other raw materials to finally obtain the meropenem. Wherein, after the preparation and synthesis of the 4-BMA, a concentration kettle is needed for concentration, and 4-BMA crystals are separated out.

The existing concentration kettle generally cannot realize continuous work, and the working efficiency of the partial concentration kettle which can realize the continuous work is still to be improved. The patent with publication number CN216336694U discloses a continuous evaporation low temperature liquid material enrichment facility, including the evaporation cauldron, the evaporation cauldron includes evaporation cauldron body and flowing back cauldron, through pipeline and first valve intercommunication between evaporation cauldron body and the flowing back cauldron, set up the inlet on the evaporation cauldron body, be provided with the liquid outlet on the flowing back cauldron, liquid outlet department is provided with the second valve, evaporation cauldron body and flowing back cauldron communicate vacuum generator respectively. When the dense liquid is discharged to needs, the valve between evaporation kettle body and the flowing back cauldron is opened, and the dense liquid enters into to the flowing back cauldron, and the valve between evaporation kettle body and the flowing back cauldron is closed after that, and the leakage fluid dram valve of flowing back cauldron is opened, and atmospheric pressure arrives atmospheric pressure back flowing back, so this internal all the time of evaporation kettle remains in vacuum state, can not lose the vacuum because of needs flowing back, therefore reation kettle can work continuously.

The device can be further improved, for example, when the evaporation kettle body heats the liquid to be evaporated and concentrated, the vapor formed after the liquid is boiled is discharged into the evaporator through the pipeline, the liquid in the evaporation kettle body can be gradually reduced and concentrated along with the increase of time, the available space in the evaporation kettle body is gradually increased, the potential utilization value is achieved, but the liquid to be concentrated can not be directly added again, and the phenomenon that the liquid cannot be boiled due to the reduction of the temperature of the liquid is avoided; in addition, when the device detects that the liquid level of the liquid in the evaporation kettle body is lower than a set value through the liquid level sensor, the controller controls the first valve to be opened, the liquid in the evaporation kettle body flows into the liquid drainage kettle, and the situation that the error is large when the preset concentration value is reached is judged only according to the high level of the liquid level.

SUMMERY OF THE UTILITY MODEL

Based on the above, it is necessary to provide an on-line liquid level detection and automatic control layering concentration kettle for 4-BMA production, aiming at the technical problems.

In order to realize the above-mentioned purpose, the utility model provides a 4-BMA production is with concentrated cauldron that on-line measuring liquid level automatic control layering, include:

the top of the kettle body is provided with a feed inlet, and the bottom of the kettle body is provided with a discharge outlet;

the jacket is fixed at the lower part of the kettle body and forms a sealed heating cavity with the kettle body in an enclosing way;

the layered plate is fixed in the kettle body and divides the inner cavity of the kettle body into an upper layer cavity and a lower layer cavity;

the opening is formed in the layered plate and is communicated with the upper layer cavity and the lower layer cavity;

the layering mechanism comprises a power push rod, a lifting frame, a lifting rod and a sealing plug, the power push rod is installed at the top of the kettle body, the output end of the power push rod extends into the kettle body and is connected with the lifting frame, the sealing plug is arranged below the lifting frame, the sealing plug is matched with the opening and used for opening and closing the opening, the sealing plug is connected with the lifting frame through the lifting rod, and the power push rod is used for driving the sealing plug to lift so as to open and close the opening;

the upper steam exhaust pipe is communicated with the top of the upper cavity;

the lower layer steam exhaust pipe is communicated with the top of the lower layer cavity;

the lower-layer electromagnetic valve is arranged on the lower-layer steam exhaust pipe;

the lower layer liquid level detector is used for detecting the liquid level of liquid in the lower layer cavity;

the upper layer liquid level detector is used for detecting the liquid level of liquid in the upper layer cavity;

and the density detector is fixedly connected with the kettle body and is used for detecting the concentration of the liquid in the lower-layer cavity.

Furthermore, install first protective tube in the jacket, first protective tube inner chamber is separated with the heating chamber, and lower floor's liquid level detector is installed on the jacket and its sense terminal gets into lower floor's chamber through first protective tube.

Furthermore, a second protective pipe is installed in the jacket, the inner cavity of the second protective pipe is separated from the heating cavity, the density detector is installed on the jacket, and the detection end of the density detector enters the lower cavity through the second protective pipe.

Further, agitator motor is installed at cauldron body top, and the (mixing) shaft is installed through the shaft coupling to the agitator motor output, and the (mixing) shaft lower extreme is located the cauldron internal, and the (mixing) shaft rotates through sealed bearing to be installed on the layering board, installs upper stirring leaf and lower floor's stirring leaf on the (mixing) shaft, and upper stirring leaf is located the upper chamber, and lower floor's stirring leaf is located the lower chamber.

Further, the sealing plug moves between the layering plate and the upper stirring blade.

Further, install heat medium import and heat medium export on the jacket, heat medium import and heat medium export all communicate with the heating chamber, and the heat medium import is located the heating chamber lower part, and the heat medium export is located heating chamber upper portion.

Furthermore, the openings are provided with a plurality of sealing plugs, and the sealing plugs correspond to the openings one to one.

Furthermore, a discharging electromagnetic valve is installed at the discharging opening.

Compared with the prior art, the technical scheme has the following beneficial effects:

1. liquid in the kettle body is continuously discharged in a steam form to gradually reduce the liquid level in the kettle body, when the liquid level is lowered to be lower than a layering plate, the liquid is located in a lower layer cavity, steam enters an upper layer cavity from an opening, when the liquid level is lowered to be lower than a lower layer liquid level detector, a power push rod drives a sealing plug to descend to seal and seal the opening, so that the upper layer cavity is separated from the lower layer cavity, meanwhile, a lower layer electromagnetic valve is electrified, the steam in the lower layer cavity is discharged from a lower layer steam exhaust pipe, at the moment, the space of the upper layer cavity can be utilized for feeding again to perform evaporation concentration operation, continuous operation is realized, the concentration efficiency is improved, and the 4-BMA production efficiency is improved;

2. the liquid concentration of the lower layer cavity is detected through the density detector, when the liquid concentration of the lower layer cavity reaches a preset value, the discharging electromagnetic valve can be automatically opened, 4-BMA materials in the lower layer cavity are discharged, the power push rod is contracted, the sealing plug is driven to rise to be away from the opening, the upper layer cavity is communicated with the lower layer cavity, liquid in the upper layer cavity enters the lower layer cavity from the opening, at the moment, liquid can be continuously added into the feeding opening until the liquid level reaches a preset liquid level interval, and continuous work is carried out;

3. stirring motor drive (mixing) shaft, upper stirring leaf and lower floor's stirring leaf are rotatory, and upper stirring leaf stirs the liquid of upper intracavity, and lower floor's stirring leaf stirs the liquid of lower intracavity, can improve liquid mobility, and then improves concentration efficiency.

Drawings

Fig. 1 is a schematic structural view of the present invention;

FIG. 2 is another state diagram of the present invention;

FIG. 3 is a cross-sectional view taken along line A-A of FIG. 1;

in the figure, 1, a kettle body; 2. a feed inlet; 3. a discharge opening; 4. a jacket; 5. a heating cavity; 6. a laminate; 7. an upper cavity; 8. a lower cavity; 9. an opening; 10. a power push rod; 11. a lifting frame; 12. a lifting rod; 13. a sealing plug; 14. an upper steam exhaust pipe; 15. a lower layer steam exhaust pipe; 16. a lower layer electromagnetic valve; 17. a lower layer liquid level detector; 18. an upper level detector; 19. a density detector; 20. a first guard tube; 21. a second guard tube; 22. a stirring motor; 23. a stirring shaft; 24. sealing the bearing; 25. an upper layer stirring blade; 26. a lower layer stirring blade; 27. a heating medium inlet; 28. a heating medium outlet; 29. and a discharge electromagnetic valve.

Detailed Description

In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, as those skilled in the art will be able to make similar modifications without departing from the spirit and scope of the present invention.

Referring to fig. 1 to 3, in an embodiment of the present invention, an on-line liquid level detection and automatic layering concentration kettle for 4-BMA production comprises: the device comprises a kettle body 1, a jacket 4, a layering plate 6, an opening 9, a layering mechanism, an upper steam exhaust pipe 14, a lower steam exhaust pipe 15, a lower electromagnetic valve 16, a lower liquid level detector 17, an upper liquid level detector 18 and a density detector 19;

wherein, the top of the kettle body 1 is provided with a feed inlet 2, and the bottom is provided with a discharge outlet 3; the feed inlet 2 is communicated with a feed pipeline, and 4-BMA stock solution to be concentrated is added into the kettle body 1 through the feed inlet 2; the discharge port 3 is provided with a discharge electromagnetic valve 29, and the 4-BMA material after concentration can be discharged by opening the discharge electromagnetic valve 29.

The jacket 4 is fixed at the lower part of the kettle body 1 and forms a sealed heating cavity 5 with the kettle body 1; steam, or heat conduction oil and hot water can be introduced into the heating cavity 5 to heat the liquid in the kettle body 1;

the layered plate 6 is fixed in the kettle body 1 and divides the inner cavity of the kettle body 1 into an upper layer cavity 7 and a lower layer cavity 8; the layered plate 6 is positioned inside the jacket 4, is not higher than the jacket 4 and is approximately positioned at the middle upper part of the heating cavity 5;

the opening 9 is arranged on the layered plate 6 and is communicated with the upper layer cavity 7 and the lower layer cavity 8;

the layering mechanism comprises a power push rod 10, a lifting frame 11, a lifting rod 12 and a sealing plug 13, the power push rod 10 is installed at the top of the kettle body 1, the output end of the power push rod 10 extends into the kettle body 1 and is connected with the lifting frame 11, the sealing plug 13 is arranged below the lifting frame 11, the sealing plug 13 is matched with the opening 9 and used for opening and closing the opening 9, the sealing plug 13 is connected with the lifting frame 11 through the lifting rod 12, and the power push rod 10 is used for driving the sealing plug 13 to lift so as to enable the sealing plug 13 to open and close the opening 9; the power push rod 10 adopts a hydraulic cylinder, and other structures can be selected according to requirements, such as a cylinder and an electric push rod; the output end of a power push rod 10 is connected with the kettle body 1 in a sliding and sealing mode through packing, when the power push rod 10 extends out, a lifting frame 11, a lifting rod 12 and a sealing plug 13 are driven to descend sequentially, the sealing plug 13 seals and closes an opening 9, so that an upper layer cavity 7 is separated from a lower layer cavity 8, when the power push rod 10 contracts, the lifting frame 11, the lifting rod 12 and the sealing plug 13 are driven to ascend sequentially, the sealing plug 13 is far away from the opening 9, and the upper layer cavity 7 is communicated with the lower layer cavity 8;

the upper steam exhaust pipe 14 is communicated with the top of the upper cavity 7; when the liquid level in the kettle body 1 is higher than the layering plate 6, the lower-layer electromagnetic valve 16 is closed, the opening 9 is opened, the steam in the kettle body 1 is discharged by the upper-layer steam exhaust pipe 14, and the upper-layer steam exhaust pipe 14 is communicated with a condenser and a vacuumizing device;

the lower layer steam exhaust pipe 15 is communicated with the top of the lower layer cavity 8, and the lower layer electromagnetic valve 16 is arranged on the lower layer steam exhaust pipe 15; when the liquid level in the kettle body 1 is lower than the layered plate 6, the opening 9 is closed by the sealing plug 13, the lower-layer electromagnetic valve 16 is opened, the steam in the upper-layer cavity 7 is discharged by the upper-layer steam exhaust pipe 14, the steam in the lower-layer cavity 8 is discharged by the lower-layer steam exhaust pipe 15, and the lower-layer steam exhaust pipe 15 is also communicated with the condenser and the vacuumizing device;

the lower liquid level detector 17 is used for detecting the liquid level of liquid in the lower cavity 8, and the lower liquid level detector 17 adopts a side-mounted capacitive liquid level sensor; the lower liquid level detector 17 is positioned below the layering plate 6 and is close to the layering plate 6, and the probe detection end of the lower liquid level detector 17 is lower than the lower steam exhaust pipe 15;

the upper layer liquid level detector 18 is used for detecting the liquid level of the liquid in the upper layer cavity 7; the upper liquid level detector 18 is arranged at the top of the kettle body 1, and the upper liquid level detector 18 adopts a radar liquid level meter.

The density detector 19 is fixedly connected with the kettle body 1 and used for detecting the concentration of the liquid in the lower-layer cavity 8. The density detector 19 is a tuning fork type liquid density sensor, and may be an ultrasonic density sensor, a capacitance type liquid density sensor, or the like.

The lower layer liquid level detector 17, the lower layer electromagnetic valve 16, the upper layer liquid level detector 18 and the density detector 19 are all connected with the same PLC control system, and the PLC control system is preset with a control program and can automatically control the concentration operation to be carried out through the control program.

In conclusion, when the concentration kettle is used, liquid is added from the feed inlet 2, the height of the liquid is higher than that of the layering plate 6, the upper liquid level detector 18 detects the liquid level in the kettle body 1, and the feeding is stopped when a preset liquid level interval is reached; after a heat medium is introduced into the jacket 4, the kettle body 1 is heated, the vacuumizing device vacuumizes the inner cavity of the kettle body 1 through the upper steam exhaust pipe 14, the liquid in the kettle body 1 boils to generate steam, the steam enters the condenser through the upper steam exhaust pipe 14, the liquid in the kettle body 1 is continuously discharged in a steam form, the liquid level in the kettle body 1 is gradually reduced, the liquid is located in the lower cavity 8 when the liquid level is reduced to be lower than the layering plate 6, the steam enters the upper cavity 7 through the opening 9, the lower liquid level detector 17 detects a signal and sends the signal to the PLC control system after the liquid level is reduced to be lower than the lower liquid level detector 17, the PLC control system controls the layering mechanism, the telescopic end of the power push rod 10 extends out to drive the lifting frame 11, the lifting rod 12 and the sealing plug 13 to sequentially descend, the sealing plug 13 seals the opening 9, so that the upper cavity 7 is separated from the lower cavity 8, the lower electromagnetic valve 16 is electrified, steam in the lower-layer cavity 8 is discharged from a lower-layer steam discharge pipe 15 and enters a condenser, and a vacuumizing device vacuumizes the lower-layer cavity 8 through the lower-layer steam discharge pipe 15;

after the opening 9 is closed by the sealing plug 13, liquid can be added into the upper-layer cavity 7 through the feeding port again, the upper-layer liquid level detector 18 detects the liquid level in the kettle body 1, and the feeding is stopped when a preset liquid level interval is reached; at the moment, the heating cavity 5 heats the upper cavity 7 and the lower cavity 8 simultaneously, steam in the upper cavity 7 is discharged through the upper steam exhaust pipe 14, steam in the lower cavity 8 is discharged through the lower steam exhaust pipe 15, when the density detector 19 detects that the liquid concentration of the lower cavity 8 reaches a preset value, a signal is sent to the PLC control system, the PLC control system controls the opening of the discharging electromagnetic valve 29 to discharge 4-BMA materials in the lower cavity 8, then the PLC control system controls the power push rod 10 to contract to drive the lifting frame 11, the lifting rod 12 and the sealing plug 13 to ascend in sequence, the sealing plug 13 is far away from the opening 9, the upper cavity 7 is communicated with the lower cavity 8, liquid in the upper cavity 7 enters the lower cavity 8 through the opening 9, liquid is continuously added into the charging opening, and the liquid level reaches a preset liquid level interval.

In order to facilitate installation of the lower layer liquid level detector 17 and simultaneously facilitate detection of the liquid level in the lower layer cavity 8 by the lower layer liquid level detector 17, a first protective pipe 20 is installed in the jacket 4, the inner cavity of the first protective pipe 20 is separated from the heating cavity 5, the lower layer liquid level detector 17 is installed on the jacket 4, and the detection end of the lower layer liquid level detector 17 enters the lower layer cavity 8 through the first protective pipe 20. The first protection pipe 20 can play a role in protection, so that the lower liquid level detector 17 is separated from the heating cavity 5, and the influence of heat medium in the heating cavity 5 is avoided.

In order to facilitate the installation of the density detector 19 and simultaneously facilitate the detection of the liquid concentration in the lower-layer cavity 8 by the density detector 19, a second protective pipe 21 is installed in the jacket 4, the inner cavity of the second protective pipe 21 is separated from the heating cavity 5, the density detector 19 is installed on the jacket 4, and the detection end of the density detector enters the lower-layer cavity 8 through the second protective pipe 21. The second shielding pipe 21 can play a role of shielding, so that the density detector 19 is separated from the heating chamber 5, and the influence of the heating medium in the heating chamber 5 is avoided.

For improving liquid mobility, and then improve concentration efficiency, install agitator motor 22 at the 1 top of the cauldron body, agitator motor 22 output passes through the shaft coupling and installs (mixing) shaft 23, (mixing) shaft 23 lower extreme is located the cauldron body 1, (mixing) shaft 23 rotates through sealed bearing 24 and installs on layering board 6, (mixing) shaft 23 is last to install upper stirring leaf 25 and lower floor's stirring leaf 26, and upper stirring leaf 25 is located upper chamber 7, and lower floor's stirring leaf 26 is located lower chamber 8. The stirring motor 22 drives the stirring shaft 23, the upper-layer stirring blade 25 and the lower-layer stirring blade 26 to rotate through the shaft coupling, the upper-layer stirring blade 25 stirs the liquid in the upper-layer cavity 7, and the lower-layer stirring blade 26 stirs the liquid in the lower-layer cavity 8; the sealing bearing 24 can play a role in sealing, and prevents the upper-layer cavity 7 and the lower-layer cavity 8 from being communicated with the gap of the layered plate 6 through the stirring shaft 23.

In order to avoid contact interference between the sealing plug 13 and the upper stirring blade 25 when the opening 9 is opened and closed by lifting, the sealing plug 13 is arranged to move between the layered plate 6 and the upper stirring blade 25.

In order to facilitate the introduction of the heating medium into the heating cavity 5, a heating medium inlet 27 and a heating medium outlet 28 are arranged on the jacket 4, the heating medium inlet 27 and the heating medium outlet 28 are both communicated with the heating cavity 5, the heating medium inlet 27 is positioned at the lower part of the heating cavity 5, and the heating medium outlet 28 is positioned at the upper part of the heating cavity 5.

For further improving concentration efficiency, avoid steam blocking, unable smooth discharge sets up opening 9 and is equipped with a plurality ofly, through increasing opening 9 quantity, increases opening 9 total area, and the steam of being convenient for upwards discharges, sets up opening 9 in this embodiment and is four, and sealing plug 13 also is four, and with opening 9 one-to-one.

The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrated; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present application, unless expressly stated or limited otherwise, a first feature "on" or "under" a second feature may be directly contacting the second feature or the first and second features may be indirectly contacting the second feature through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. As used herein, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are for purposes of illustration only and do not denote a single embodiment.

Claims (8)

1. An online detection liquid level automatic control layering concentration kettle for 4-BMA production comprises:

the top of the kettle body (1) is provided with a feeding hole (2), and the bottom of the kettle body is provided with a discharging hole (3);

the jacket (4) is fixed at the lower part of the kettle body (1) and forms a sealed heating cavity (5) with the kettle body (1);

it is characterized by also comprising:

the layered plate (6) is fixed in the kettle body (1) and divides the inner cavity of the kettle body (1) into an upper-layer cavity (7) and a lower-layer cavity (8);

an opening (9) which is arranged on the layered plate (6) and is communicated with the upper layer cavity (7) and the lower layer cavity (8);

the layering mechanism comprises a power push rod (10), a lifting frame (11), a lifting rod (12) and a sealing plug (13), wherein the power push rod (10) is installed at the top of the kettle body (1), the output end of the power push rod (10) extends into the kettle body (1) and is connected with the lifting frame (11), the sealing plug (13) is arranged below the lifting frame (11), the sealing plug (13) is matched with the opening (9) and used for opening and closing the opening (9), the sealing plug (13) is connected with the lifting frame (11) through the lifting rod (12), and the power push rod (10) is used for driving the sealing plug (13) to lift so as to enable the sealing plug (13) to open and close the opening (9);

the upper steam exhaust pipe (14) is communicated with the top of the upper cavity (7);

the lower steam exhaust pipe (15) is communicated with the top of the lower cavity (8);

the lower-layer electromagnetic valve (16) is arranged on the lower-layer steam exhaust pipe (15);

a lower level detector (17) for detecting the level of liquid in the lower chamber (8);

an upper level detector (18) for detecting the level of liquid in the upper chamber (7);

and the density detector (19) is fixedly connected with the kettle body (1) and is used for detecting the concentration of the liquid in the lower-layer cavity (8).

2. The on-line detection liquid level automatic control layering concentration kettle for 4-BMA production according to claim 1, wherein a first protection tube (20) is installed in the jacket (4), the inner cavity of the first protection tube (20) is separated from the heating cavity (5), the lower layer liquid level detector (17) is installed on the jacket (4) and the detection end of the lower layer liquid level detector enters the lower layer cavity (8) through the first protection tube (20).

3. The on-line detection liquid level automatic control layering concentration kettle for 4-BMA production according to claim 1, wherein a second protective pipe (21) is installed in the jacket (4), the inner cavity of the second protective pipe (21) is separated from the heating cavity (5), the density detector (19) is installed on the jacket (4) and the detection end of the density detector enters the lower cavity (8) through the second protective pipe (21).

4. The 4-BMA production is with concentrated cauldron of on-line measuring liquid level automatic control layering of claim 1, characterized in that, agitator motor (22) is installed at cauldron body (1) top, and agitator motor (22) output end installs (23) through the shaft coupling, and (23) lower extreme is located cauldron body (1), and (23) rotate through sealed bearing (24) and install on layering board (6) with (23) and install upper stirring leaf (25) and lower floor's stirring leaf (26), and upper stirring leaf (25) are located upper chamber (7), and lower floor's stirring leaf (26) are located lower chamber (8).

5. The on-line detection liquid level automatic control layering concentrating kettle for 4-BMA production according to claim 4, wherein the sealing plug (13) moves between the layering plate (6) and the upper stirring blade (25).

6. The on-line detection liquid level automatic control layering concentration kettle for 4-BMA production according to claim 1, wherein a heating medium inlet (27) and a heating medium outlet (28) are installed on the jacket (4), the heating medium inlet (27) and the heating medium outlet (28) are both communicated with the heating cavity (5), the heating medium inlet (27) is located at the lower part of the heating cavity (5), and the heating medium outlet (28) is located at the upper part of the heating cavity (5).

7. The on-line detection and liquid level automatic control layering concentration kettle for 4-BMA production according to claim 1, wherein a plurality of openings (9) are provided, and the sealing plugs (13) correspond to the openings (9) one by one.

8. The on-line detection and liquid level automatic control layering concentrator for 4-BMA production according to claim 1, wherein a discharge solenoid valve (29) is installed at the discharge port (3).

Images