Reaction kettle and feeding device for synthesizing acetamido abamectin

Abstract

The utility model relates to a reaction kettle and a feeding device for synthesizing acetamido abamectin. The reaction kettle comprises a kettle body, a feeding opening formed in the kettle body and the feeding device arranged at the feeding opening, the feeding device comprises a rack, a weighing bin arranged on the rack and a feeding mechanism arranged below the weighing bin, and the feeding mechanism comprises a mounting seat fixedly connected with a feeding port of the reaction kettle, a feeding pipe rotationally arranged on the mounting seat and a throwing disc fixedly arranged at the bottom of the feeding pipe. A feeding hopper is arranged at the top of the feeding pipe, and a plurality of discharging ports are formed in the positions, close to the throwing disc, of the side wall of the feeding pipe. According to the sodium borohydride feeding device, mechanical feeding of sodium borohydride is achieved, the blanking area of materials is enlarged, the materials can be rapidly and evenly distributed conveniently, and a series of problems caused by the small blanking area and the too high local concentration of the materials are avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of reaction kettles, and particularly relates to a reaction kettle and a feeding device for synthesizing acetylaminoavermectin. Background Art

[0002] Acetylaminoavermectin is prepared from avermectin through protection reaction, oxidation reaction, amination reaction, reduction reaction, deprotection reaction and acetylation reaction in sequence. When carrying out the reduction reaction, sodium borohydride is used as a reducing agent, and the reduction is carried out at -5 to -10°C in an ethanol solution. Since this reaction is an exothermic reaction, in order to avoid excessive temperature fluctuations during the reaction and hydrogen accumulation and explosion caused by excessive reaction of sodium borohydride, sodium borohydride needs to be slowly added to the reaction kettle, and 5 kg of sodium borohydride needs to be fed within about 2 hours; and the feeding is carried out in a scattered manner to promote the rapid and uniform distribution of sodium borohydride. At present, the reaction kettle does not have a separate feeding device for sodium borohydride, and this operation is usually completed manually, which is not only time-consuming and laborious, but also increases the labor cost; therefore, it is crucial to develop a reaction kettle for synthesizing acetylaminoavermectin to realize the mechanization of slow feeding of sodium borohydride.

[0003] To achieve the above purpose, the R & D personnel of our company once tried to apply the seed quantitative discharging device structure and screw discharging device structure in the prior art to the slow feeding of sodium borohydride. However, the problem is that it can only achieve slow quantitative feeding of sodium borohydride, but when sodium borohydride falls, the position is fixed and the falling area is small, which is undoubtedly not conducive to the rapid and uniform distribution of sodium borohydride. Therefore, it cannot simulate the rapid distribution problem caused by manual scattered feeding of sodium borohydride. Summary of the Utility Model

[0004] The purpose of the utility model is to overcome a series of defects caused by the time-consuming and laborious manual scattered feeding of sodium borohydride and the small falling area of the traditional seed quantitative discharging device structure and screw discharging device structure when synthesizing acetylaminoavermectin by using a reaction kettle, and provides a reaction kettle and a feeding device for synthesizing acetylaminoavermectin.

[0005] To achieve the above purpose, the technical solutions adopted by the utility model are as follows:

[0006] A feeding device includes a frame, a weighing bin arranged on the frame, and a feeding mechanism arranged below the weighing bin. The feeding mechanism includes a mounting seat fixedly connected to the feeding port of the reaction kettle, a feeding pipe rotatably arranged on the mounting seat, and a throwing disc fixedly arranged at the bottom of the feeding pipe. An inlet hopper is arranged at the top of the feeding pipe, and a plurality of discharge ports are arranged on the side wall of the feeding pipe adjacent to the throwing disc.

[0007] As a further technical solution, a feeding motor is arranged on the frame, and the feeding motor is in transmission connection with the feeding pipe.

[0008] As a further technical solution, the outer diameter of the throwing disc is smaller than the caliber of the feeding port.

[0009] As a further technical solution, an arc-shaped baffle is further arranged at the bottom of the mounting seat. The arc-shaped baffle is arranged on one side of the throwing disc close to the wall of the reaction kettle. A material leakage gap is arranged between the arc-shaped baffle and the throwing disc, and the upper surface of the throwing disc is higher than the lower surface of the arc-shaped baffle.

[0010] As a further technical solution, the weighing bin includes a mounting plate fixedly arranged on the frame, a bin erected on the mounting plate through wing plates, and a plurality of weighing sensors arranged between the mounting plate and the bin.

[0011] As a further technical solution, a discharge pipe is arranged at the bottom of the bin, and a plug valve is arranged on the discharge pipe.

[0012] As a further technical solution, the discharge port of the discharge pipe is arranged in the feed hopper.

[0013] As a further technical solution, a material level sensor is further arranged in the feeding pipe.

[0014] As a further technical solution, a PLC controller is further included. The plug valve adopts an electric plug valve, and the PLC controller is respectively in communication connection with the material level sensor, the electric plug valve, and the weighing sensor.

[0015] A reaction kettle for synthesizing acetylamino avermectin includes a kettle body, a feeding port arranged on the kettle body, and the feeding device arranged at the feeding port.

[0016] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0017] By arranging the feeding pipe and the throwing disc, when the feeding pipe and the throwing disc rotate, sodium borohydride is slowly scattered into the reaction kettle by using centrifugal force. It not only realizes the mechanized feeding of sodium borohydride, but also has a wider falling area compared with the seed metering discharger and the screw discharger in the prior art, which is convenient for the rapid and uniform distribution of sodium borohydride, and avoids a series of problems caused by the small falling area and the too high local concentration of sodium borohydride.

[0018] Limited by the size of the charging port of the reactor, the diameter of the charging pipe cannot be too large. Therefore, it is necessary to manually add materials to the charging pipe multiple times, or increase the height of the charging pipe to increase its volume. However, after the height of the charging pipe increases, the load on the bottom materials will also increase, thereby compacting the materials and making it difficult for the materials to be smoothly thrown out. To solve this problem, the present utility model provides a weighing bin for temporarily storing sodium borohydride. During use, the materials in the weighing bin can be transferred to the charging pipe in multiple batches, thus avoiding a series of problems caused by increasing the height of the charging pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 FIG. is a schematic structural diagram of a reactor for synthesizing emamectin benzoate in an embodiment of the present utility model;

[0020] Figure 2 FIG. is a schematic structural diagram of a feeding device in an embodiment of the present utility model;

[0021] Figure 3 FIG. is a perspective view of a feeding mechanism in an embodiment of the present utility model;

[0022] Figure 4 FIG. is a control schematic diagram of a PLC controller in an embodiment of the present utility model.

[0023] In the figures: 1, frame; 2, mounting seat; 3, charging pipe; 4, throwing plate; 5, feed hopper; 6, discharge port; 7, charging motor; 8, arc-shaped baffle; 9, leakage gap; 10, mounting plate; 11, wing plate; 12, bin; 13, weighing sensor; 14, discharge pipe; 15, plug valve; 16, level sensor; 17, PLC controller; 18, kettle body; 19, hollow cavity; 20, temperature control medium inlet; 21, temperature control medium outlet; 22, stirrer; 23, feeding device; 24, reactor; 25, feeding mechanism; 27, weighing bin; 26, charging port. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Apparently, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art without creative efforts based on the embodiments of the present utility model belong to the protection scope of the present utility model.

[0025] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0026] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0027] The present utility model will be further described in detail below with reference to the drawings.

[0028] Figures 1-3 An embodiment of a reaction kettle for synthesizing acetylamino avermectin according to the present utility model is shown, including a kettle body 18, a feeding port 26 provided on the kettle body 18, and a feeding device 23 provided at the feeding port 26; the feeding device 23 includes a frame 1, a weighing bin 27 provided on the frame 1, and a feeding mechanism 25 provided below the weighing bin 27. The feeding mechanism 25 includes a mounting seat 2 fixedly connected to the feeding port 26 of the reaction kettle 24, a feeding pipe 3 rotatably arranged on the mounting seat 2 through a bearing, and a throwing disc 4 fixedly provided at the bottom of the feeding pipe 3. An inlet hopper 5 is provided at the top of the feeding pipe 3, and a plurality of discharge ports 6 are provided on the side wall of the feeding pipe 3 adjacent to the throwing disc 4. By providing the feeding pipe 3 and the throwing disc 4, when the feeding pipe 3 and the throwing disc 4 rotate, sodium borohydride is slowly scattered into the reaction kettle 24 by centrifugal force. It not only realizes the mechanized automatic feeding of sodium borohydride, but also has a wider material dropping area compared with the seed metering discharger and screw discharger in the prior art, which is convenient for the rapid and uniform distribution of sodium borohydride and avoids a series of problems caused by its small material dropping area and too high local concentration of sodium borohydride.

[0029] Due to the size limitation of the feeding port 26 of the reactor 24, the diameter of the feeding pipe 3 cannot be too large. Therefore, it is necessary to manually add materials to the feeding pipe 3 multiple times, or to increase the height of the feeding pipe 3 to increase the volume of the feeding pipe 3. After the height of the feeding pipe 3 is increased, the load-bearing capacity of the bottom material will also increase, thereby compacting the material, which is not conducive to the smooth throwing of the material. To solve this problem, the utility model is provided with a weighing bin 27 for temporary storage of sodium borohydride. When in use, the material in the weighing bin 27 can be transferred to the feeding pipe 3 in multiple times, avoiding a series of problems caused by increasing the height of the feeding pipe 3.

[0030] As an embodiment of the reaction kettle for synthesizing avermectin of the utility model, a feeding motor 7 is arranged on the frame 1 , and the feeding motor 7 is drivingly connected to the feeding pipe 3 .

[0031] As an embodiment of the reaction kettle for synthesizing avermectin of the utility model, the feeding motor 7 is connected to the feeding pipe 3 by gear transmission.

[0032] As an embodiment of the reactor for synthesizing avermectin of the utility model, the feeding motor 7 is connected to the feeding pipe 3 by a sprocket chain transmission.

[0033] As an embodiment of the reactor for synthesizing avermectin of the utility model, the feeding motor 7 is connected to the feeding pipe 3 by a belt and a pulley transmission.

[0034] As an embodiment of the reactor for synthesizing avermectin of the utility model, the outer diameter of the throwing plate 4 is smaller than the diameter of the feeding port 26 , so as to facilitate the feeding plate 4 to be fed into the reactor 24 .

[0035] As an embodiment of a reactor for synthesizing avermectin of the utility model, an arc-shaped material baffle plate 8 is further provided at the bottom of the mounting seat 2, and the arc-shaped material baffle plate 8 is arranged on the side of the throwing plate 4 close to the wall of the reactor 24; a leakage gap 9 is provided between the arc-shaped material baffle plate 8 and the throwing plate 4, and the upper surface of the throwing plate 4 is higher than the lower surface of the arc-shaped material baffle plate 8. The setting of the arc-shaped material baffle plate 8 can prevent sodium borohydride from colliding with the wall of the reactor 24 and hanging on the wall of the reactor 24 when the throwing plate 4 throws the material.

[0036] As an embodiment of the reaction kettle for synthesizing avermectin of the utility model, the weighing silo 27 includes a mounting plate 10 fixedly mounted on the frame 1, a silo 12 mounted on the mounting plate 10 through a wing plate 11, and a plurality of weighing sensors 13 arranged between the mounting plate 10 and the silo 12. The amount of material transferred to the feeding barrel is determined by measuring the weight of the material in the silo 12.

[0037] As an embodiment of a reactor for synthesizing abamectin acetamido in the present utility model, a discharge pipe 14 is provided at the bottom of the bin 12, and a knife gate valve 15 is provided on the discharge pipe 14.

[0038] As an embodiment of a reactor for synthesizing abamectin acetamido in the present utility model, the discharge port of the discharge pipe 14 is arranged above the feed hopper 5 or inside the feed hopper 5.

[0039] As an embodiment of a reactor for synthesizing abamectin acetamido in the present utility model, a level sensor 16 is further arranged in the feeding pipe 3, and the level sensor 16 is used to indicate the amount of materials in the feeding pipe 3. When in use of the present utility model, when the level sensor 16 shows that the material level in the feeding pipe 3 is lower than the set threshold value, the knife gate valve is opened to release the materials in the bin 12 into the feeding pipe 3, and the weight sensor 13 monitors the weight of the materials in the bin 12. When the reduction amount of the materials in the bin 12 reaches the set value, the knife gate valve 15 can be closed. As an embodiment of the present utility model, the above operations can be performed manually. As another embodiment of the present utility model, it can also be controlled by a PLC controller 17.

[0040] As another embodiment of a reactor for synthesizing abamectin acetamido in the present utility model, it further includes a PLC controller 17. The knife gate valve 15 adopts an electric knife gate valve 15. As Figure 4 shown, the PLC controller 17 is respectively in communication connection with the level sensor 16, the electric knife gate valve 15, and the weight sensor 13. The PLC controller 17, the level sensor 16, the electric knife gate valve 15, and the weight sensor 13 of the present utility model are all commercially available components. Controlling the opening of the knife gate valve 15 according to the data of the level sensor 16 and controlling the closing of the knife gate valve 15 according to the data of the weight sensor 13 belong to the prior art, and their specific structures and connection relationships will not be elaborated herein.

[0041] As an embodiment of a reactor for synthesizing abamectin acetamido in the present utility model, the PLC controller 17 adopts a Hitachi PLC programmable controller MV-D64DT; the level sensor 16 adopts a level sensor 16 XKCON-GDRD58 from Jinan Xiangkong, and the weight sensor 13 adopts a German HBM Z6FD1-10KG weight sensor 13.

[0042] As an embodiment of a reactor for synthesizing abamectin acetamido in the present utility model, a hollow cavity 19 is provided on the wall of the kettle body 18, thus forming a jacket structure. A temperature control medium is arranged in the hollow cavity 19, and a temperature control medium inlet 20 and a temperature control medium outlet 21 communicated with the hollow cavity 19 are further arranged on the wall of the kettle body 18.

[0043] As an embodiment of a reactor for synthesizing abamectin acetamido, a stirrer 22 is further provided on the kettle body 18.

[0044] Usage method of the present utility model:

[0045] When the present utility model is in use, first install the mounting seat 2 to the feeding port 26 of the reactor 24 through bolts, then drive-connect the motor with the feeding pipe 3, arrange the material bin 12 above the feeding pipe 3, and arrange the lower part of the discharging pipe 14 in the feeding hopper 5;

[0046] Then, add a specified amount of sodium borohydride into the material bin 12, then control the opening of the plug valve 15 manually or through the PLC controller 17 to release a specified amount of sodium borohydride into the feeding pipe 3, then close the plug valve 15, start the motor. As the feeding pipe 3 and the parabolic disk rotate, the material enters the parabolic disk through the discharge port 6 and is thrown out under the action of centrifugal force and scattered into the reactor 24; when the material level of sodium borohydride in the feeding pipe 3 is lower than the specified value, control the opening of the plug valve 15 manually or through the PLC controller 17 again to release a specified amount of sodium borohydride into the feeding pipe 3, and so on in cycles until the feeding of sodium borohydride is completed.

[0047] The above-described embodiments are only the preferred embodiments of the present utility model, rather than an exhaustive list of the feasible embodiments of the present utility model. For those of ordinary skill in the art, any obvious changes made without departing from the principle and spirit of the present utility model should be considered to be included within the protection scope of the claims of the present utility model.

Claims

1. A feeding device, characterized in that, It includes a frame (1), a weighing bin (27) arranged on the frame (1), and a feeding mechanism (25) arranged below the weighing bin (27). The feeding mechanism (25) includes a mounting seat (2) fixedly connected to the feeding port (26) of the reaction kettle (24), a feeding pipe (3) rotatably arranged on the mounting seat (2), and a throwing plate (4) fixedly arranged at the bottom of the feeding pipe (3). An inlet hopper (5) is arranged at the top of the feeding pipe (3), and a plurality of discharge ports (6) are arranged on the side wall of the feeding pipe (3) adjacent to the throwing plate (4).

2. The feeding device according to claim 1, characterized in that, A feeding motor (7) is arranged on the frame (1), and the feeding motor (7) is in transmission connection with the feeding pipe (3).

3. The feeding device according to claim 1, characterized in that, The outer diameter of the throwing plate (4) is smaller than the diameter of the feeding port (26).

4. The feeding device according to claim 1, characterized in that, An arc-shaped baffle plate (8) is further arranged at the bottom of the mounting seat (2). The arc-shaped baffle plate (8) is arranged on the side of the throwing plate (4) close to the wall of the reaction kettle (24). A leakage gap (9) is arranged between the arc-shaped baffle plate (8) and the throwing plate (4), and the upper surface of the throwing plate (4) is higher than the lower surface of the arc-shaped baffle plate (8).

5. A feeding device according to claim 1, characterized in that, The weighing bin (27) includes a mounting plate (10) fixedly arranged on the frame (1), a bin (12) erected on the mounting plate (10) through wing plates (11), and a plurality of weighing sensors (13) arranged between the mounting plate (10) and the bin (12).

6. The feeding device according to claim 5, characterized in that, A discharge pipe (14) is arranged at the bottom of the bin (12), and a plug valve (15) is arranged on the discharge pipe (14).

7. The feeding device according to claim 6, wherein The discharge port of the discharge pipe (14) is arranged in the inlet hopper (5).

8. An input device according to claim 6, characterized in that, A level sensor (16) is further arranged in the feeding pipe (3).

9. The feeding device according to claim 8, wherein It further includes a PLC controller (17). The plug valve (15) adopts an electric plug valve (15), and the PLC controller (17) is respectively in communication connection with the level sensor (16), the electric plug valve (15), and the weighing sensors (13).

10. A reactor for synthesizing acetylamino avermectin, characterized in that, It includes a kettle body (18), a feeding port (26) arranged on the kettle body (18), and a feeding device as described in any one of claims 1-9 arranged at the feeding port (26).

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