Raw material conveying equipment of wet type granulator

Abstract

The utility model relates to raw material conveying equipment of a wet type granulator, which comprises the wet type granulator, a first regulating valve arranged on the wet type granulator, a first jacketed pipe arranged above the first regulating valve, a first stop valve arranged above the first jacketed pipe, a quantitative tank arranged above the first stop valve, and a second regulating valve arranged above the quantitative tank, a second adjusting valve is arranged above the quantifying tank, a second jacketed pipe is arranged above the second adjusting valve, a second stop valve is arranged above the second jacketed pipe, a mixing tank is arranged above the second stop valve and comprises a tank body and a jacket, and each of the first jacketed pipe and the second jacketed pipe comprises an inner pipe, an outer pipe and an inter-pipe cavity. And the temperature drop of the quantified adhesive in the process of conveying to the wet granulator is reduced. The utility model has the advantages of convenient use and wide market prospect.

Description

Technical Field

[0001] The utility model relates to the field of raw material conveying of a wet granulator, in particular to raw material conveying equipment of a wet granulator. Background Art

[0002] The preparation of tablets is divided into direct tableting and granulation tableting. The latter is further divided into wet granulation and dry granulation according to the production process. The traditional wet granulation process is still the mainstream process in drug production. The wet granulation process is a method of first processing the raw materials into powders, then adding binders, and relying on the bridge or bonding effect of the binder to make the powders agglomerate together to prepare particles. It has the advantages of mature production technology, good particle quality, high production efficiency, and good compression molding. The manufacturing process of tablets generally includes raw material processing, weighing, mixed granulation, drying, total mixing, tableting and coating. Before wet mixing granulation production, the raw materials and auxiliary materials generally need to be crushed and sieved to improve uniformity. Wet granulators are mostly used in modern production. The process conditions that affect the quality of wet granules mainly include the type, temperature, dosage, addition method of the binder, the stirring and chopping speed of the granulator, the stirring and chopping time, and many other factors. Among them, the addition method, concentration, dosage, and temperature of the binder are particularly important. The existing equipment generally adds the adhesive into the hopper, starts the machine to dry-mix the materials evenly, and then opens the valve to add the adhesive into the materials in the stirring state.

[0003] The temperature of the adhesive is the most difficult parameter to control in scale-up production. Therefore, most varieties do not use temperature as a control indicator, but in actual production, it is found that temperature does have a greater impact on some special varieties. For these varieties, the temperature needs to be clearly required. Therefore, in the process of using various slurry adhesives, including syrups of different concentrations, HPM slurry, K30 and mixed slurries as adhesives, the temperature of the adhesive should be controlled to reduce the difference between particles produced in different batches. The specific adhesive conveying process includes conveying the various slurry adhesives that have been heated in the mixing tank to a given measuring tank via a pipeline for quantitative measurement, and conveying the various slurry adhesives that have been quantitatively measured to the raw materials in a stirring state at a uniform speed during the process of the wet granulator stirring the raw materials. However, this process requires a certain amount of time. During this process, the various slurry adhesives that have been heated will exchange heat with the adjacent air, causing the temperature of the various slurry adhesives that have been heated to drop; therefore, there is room for improvement in the temperature reduction caused by the heat exchange between the various slurry adhesives and the adjacent air during the process of conveying the various slurry adhesives that have been quantitatively measured to the raw materials in the stirring state in the wet granulator, thereby reducing the differences in granules made between different batches due to the inconsistency of the temperatures of the various slurry adhesives used. Summary of the invention

[0004] In view of the deficiencies of the prior art, the utility model provides a raw material conveying device for a wet granulator, which reduces the temperature drop of a quantitative adhesive during the process of conveying it to the wet granulator, so as to overcome the defects of the prior art.

[0005] The technical scheme adopted by the utility model is as follows: a raw material conveying device of a wet granulator comprises a wet granulator, the wet granulator comprises a feed pipe and an infusion nozzle, a first regulating valve is arranged on the infusion nozzle of the wet granulator, a first jacket pipe is arranged above the first regulating valve, a first stop valve is arranged above the first jacket pipe, a quantitative tank is arranged above the first stop valve, a second regulating valve is arranged above the quantitative tank, a second jacket pipe is arranged above the second regulating valve, a second stop valve is arranged above the second jacket pipe, and a quantitative tank is arranged above the first stop valve. A mixing tank is provided, which includes a tank body and a jacket arranged on the outside of the tank body, a first jacket tube and a second jacket tube each including an inner tube, an outer tube arranged on the outside of the inner tube and an intertube cavity arranged between the inner tube and the outer tube, the inner cavity of the mixing tank is connected to the inner tube of the first jacket tube, the inner tube of the first jacket tube and the inner tube of the second jacket tube are connected through the inner cavity of the quantitative tank, the valve cavity of the first regulating valve and the valve cavity of the first stop valve are connected through the inner tube of the first jacket tube, and the valve cavity of the second regulating valve and the valve cavity of the second stop valve are connected through the inner tube of the second jacket tube.

[0006] Preferably, the inter-tube cavity of the first jacketed tube and the inter-tube cavity of the second jacketed tube are connected to a hot gas transport main pipe and an exhaust gas exhaust main pipe, and the hot gas transport main pipe is provided with a self-cleaning air filter, a one-way valve, an air compression unit, an electric heater, a first temperature sensor and a buffer tank in sequence along the direction from the inlet end of the hot gas transport main pipe to the outlet end of the hot gas transport main pipe, and the buffer tank is provided with a first pressure sensor.

[0007] Preferably, the inter-tube cavity of the first jacketed tube and the hot gas transport main pipe, as well as the inter-tube cavity of the second jacketed tube and the hot gas transport main pipe are respectively connected through the first hot gas transport branch pipe, and each first hot gas transport branch pipe is respectively provided with a third stop valve; the inter-tube cavity of the first jacketed tube and the exhaust gas emission main pipe, as well as the inter-tube cavity of the second jacketed tube and the exhaust gas emission main pipe are respectively connected through the first exhaust gas emission branch pipe, and each first exhaust gas emission branch pipe is respectively provided with a third regulating valve and a second temperature sensor.

[0008] Preferably, the top of the quantitative tank and the hot gas transport main pipe are connected through a second hot gas transport branch pipe, and the second hot gas transport branch pipe is provided with a second pressure sensor, an inlet end of a second exhaust gas emission branch pipe and a fourth regulating valve in sequence along the direction from close to the quantitative tank to far away from the quantitative tank, the outlet end of the second exhaust gas emission branch pipe is connected to the exhaust gas emission main pipe, and the second exhaust gas emission branch pipe is provided with a fourth stop valve.

[0009] Preferably, the tank bodies of the quantitative tank and the mixing tank are respectively provided with liquid level sensors.

[0010] Preferably, a stirring device is provided on the tank body of the mixing tank, and the stirring device includes a driving shaft provided on the tank body of the mixing tank, stirring blades provided on the driving shaft inside the tank body of the mixing tank, and a first driving motor transmission-connected to the driving shaft.

[0011] Preferably, a solid raw material storage tank is arranged above the feed pipe of the wet granulator, and a solid raw material conveying pipe is connected between the solid raw material storage tank and the wet granulator. The solid raw material conveying pipe is sequentially provided with a fifth stop valve, a feeder, a weighing tank and a sixth stop valve along the direction from top to bottom, and the feeder is transmission-connected to a second drive motor.

[0012] The utility model has the following beneficial effects: firstly, the utility model can heat-insulate the adhesive in the inner tube of the second jacket tube by conveying heated compressed air into the tube cavity of the second jacket tube, thereby avoiding the temperature drop caused by the adhesive temporarily stored in the inner tube of the second jacket tube exchanging heat with the outside, and can heat-insulate the adhesive in the inner tube of the first jacket tube by conveying heated compressed air into the tube cavity of the first jacket tube, thereby reducing the temperature drop of the adhesive that has been quantitatively conveyed to the wet granulator.

[0013] Secondly, the buffer tank of the utility model is provided with a first pressure sensor; installation of the first pressure sensor facilitates feedback of pressure parameters.

[0014] Finally, in the utility model, each first tail gas emission branch pipe is respectively provided with a third regulating valve and a second temperature sensor; the installation of the second temperature sensor facilitates the feedback of the temperature parameters of the gas transported through the corresponding first tail gas emission branch pipe.

[0015] The utility model has the advantages of simple structure, convenient operation, ingenious design, greatly improved working efficiency, good social and economic benefits, and is a product that is easy to promote and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the utility model.

[0017] Figure 2 for Figure 1 A partial enlarged schematic diagram of detail A.

[0018] Figure 3 for Figure 1 A partial enlarged schematic diagram of detail B. DETAILED DESCRIPTION

[0019] like Figures 1 to 3 As shown, a raw material conveying device of a wet granulator comprises a wet granulator 1, wherein the wet granulator 1 comprises a feed pipe and an infusion nozzle, wherein a first regulating valve 2 is arranged on the infusion nozzle of the wet granulator 1, a first jacket tube 3 is arranged above the first regulating valve 2, a first stop valve 4 is arranged above the first jacket tube 3, a quantitative tank 5 is arranged above the first stop valve 4, a second regulating valve 6 is arranged above the quantitative tank 5, a second jacket tube 7 is arranged above the second regulating valve 6, a second stop valve 8 is arranged above the second jacket tube 7, and a mixing tank is arranged above the second stop valve 8. 9. The mixing tank 9 includes a tank body and a jacket arranged on the outside of the tank body. The first jacket tube 3 and the second jacket tube 7 both include an inner tube, an outer tube arranged on the outside of the inner tube and an intertube cavity arranged between the inner tube and the outer tube. The inner cavity of the mixing tank 9 is connected to the inner tube of the first jacket tube 3, the inner tube of the first jacket tube 3 and the inner tube of the second jacket tube 7 are connected through the inner cavity of the quantitative tank 5, the valve cavity of the first regulating valve 2 and the valve cavity of the first stop valve 4 are connected through the inner tube of the first jacket tube 3, and the valve cavity of the second regulating valve 6 and the valve cavity of the second stop valve 8 are connected through the inner tube of the second jacket tube 7.

[0020] The inter-tube cavity of the first jacketed tube 3 and the inter-tube cavity of the second jacketed tube 7 are connected with a hot gas transport main pipe 10 and an exhaust gas exhaust main pipe 11. The hot gas transport main pipe 10 is provided with a self-cleaning air filter 12, a one-way valve 13, an air compression unit 14, an electric heater 15, a first temperature sensor 16 and a buffer tank 17 in sequence along the direction from the inlet end of the hot gas transport main pipe 10 to the outlet end of the hot gas transport main pipe 10. The buffer tank 17 is provided with a first pressure sensor 18. The inter-tube cavity of the first jacket tube 3 and the hot gas transport main pipe 10, as well as the inter-tube cavity of the second jacket tube 7 and the hot gas transport main pipe 10 are respectively connected through the first hot gas transport branch pipe 19, and each first hot gas transport branch pipe 19 is respectively provided with a third stop valve 20; the inter-tube cavity of the first jacket tube 3 and the exhaust gas emission main pipe 11, as well as the inter-tube cavity of the second jacket tube 7 and the exhaust gas emission main pipe 11 are respectively connected through the first exhaust gas emission branch pipe 21, and each first exhaust gas emission branch pipe 21 is respectively provided with a third regulating valve 22 and a second temperature sensor 23.

[0021] Furthermore, the top of the metering tank 5 and the hot gas transport main pipe 10 are connected through a second hot gas transport branch pipe 24, and the second hot gas transport branch pipe 24 is provided with a second pressure sensor 25, an inlet end of a second exhaust gas emission branch pipe 26 and a fourth regulating valve 27 in sequence along the direction from close to the metering tank 5 to away from the metering tank 5. The outlet end of the second exhaust gas emission branch pipe 26 is connected to the exhaust gas emission main pipe 11, and a fourth stop valve 28 is provided on the second exhaust gas emission branch pipe 26. The heated compressed air is delivered to the quantitative tank 5 through the second hot air delivery branch pipe 24 to the upper layer of the quantitative adhesive in the quantitative tank 5, thereby providing the power required for delivering the quantitative adhesive to the infusion nozzle of the wet granulator 1. In addition, since the gas is heated by the electric heater 15, the phenomenon of the temperature drop of the adhesive in the quantitative tank 5 caused by the heat exchange between the air and the adhesive in the quantitative tank 5 due to the low air temperature is reduced. It is worth mentioning that a first observation window 40 is provided on the end of the outer tube of the first jacket tube 3 of the product adjacent to the first regulating valve 2, and a second observation window 41 is provided on the inner tube of the first jacket tube 3 inside the first observation window 40. The first observation window 40 and the second observation window 41 are both arc-shaped sheet structures made of transparent materials. Therefore, it is convenient for the staff to observe through the first observation window 40 and the second observation window 41 whether the quantitative adhesive in the quantitative tank 5 has been completely delivered to the infusion nozzle of the wet granulator 1, thereby giving a hint whether to close the first regulating valve 2 and the first stop valve 4.

[0022] The tank bodies of the quantitative tank 5 and the mixing tank 9 are respectively provided with liquid level sensors 29; the installation of the liquid level sensor 29 facilitates the feedback of liquid level parameters; the tank body of the mixing tank 9 is provided with a stirring device, and the stirring device includes a driving shaft 30 provided on the tank body of the mixing tank 9, a stirring blade 31 provided on the driving shaft 30 inside the tank body of the mixing tank 9, and a first driving motor 32 connected to the driving shaft 30.

[0023] A solid raw material storage tank 33 is arranged above the feed pipe of the wet granulator 1, a lower material level meter 43 is arranged in the solid raw material storage tank 33, and an upper material level meter 42 is arranged in the solid raw material storage tank 33 above the lower material level meter 43, the lower material level meter 43 is used to feedback the minimum material level height of the solid raw material required for the wet granulator 1 to complete one wet granulation, and the upper material level meter 42 is used to feedback the maximum safe material level height that the solid raw material storage tank 33 can bear. The solid raw material delivery pipe 34 is connected between the solid raw material storage tank 33 and the wet granulator 1, and the solid raw material delivery pipe 34 is sequentially provided with a fifth stop valve 35, a feeder 36, a weighing tank 37 and a sixth stop valve 38 in the direction from top to bottom, and the feeder 36 is transmission-connected to a second drive motor 39.

[0024] The usage of this product is as follows: Figures 1 to 3 As shown, the following steps are included:

[0025] S1. Add purified water into the tank body of the mixing tank 9 until the liquid level parameter fed back by the liquid level sensor 29 on the mixing tank 9 reaches a preset range; then, turn on the first drive motor 32 so as to use the first drive motor 32 to drive the drive shaft 30 to rotate so as to realize the synchronous rotation movement of the stirring blade 31, and then realize the stirring blade 31 to stir the purified water in the tank body of the mixing tank 9; then, add the weighed liquid adhesive slurry and solid adhesive raw material to the purified water in the tank body of the mixing tank 9 in a stirring state at a uniform speed, and fully mix the liquid adhesive slurry, the solid adhesive raw material and the purified water to form an unheated adhesive mixed slurry; finally, transport high-pressure steam into the jacket of the mixing tank 9, and the high-pressure steam and the unheated adhesive mixed slurry in a stirring state are indirectly heat exchanged, so as to complete the heating of the unheated adhesive mixed slurry in a stirring state to form an adhesive.

[0026] S2. Turn on the air compression unit 14 and the electric heater 15. The external air is filtered by the self-cleaning air filter 12 for mechanical impurities and then enters the hot air delivery main pipe 10. It is then heated by the electric heater 15 and sent to the buffer tank 17 for temporary storage until the parameters fed back by the first pressure sensor 18 on the buffer tank 17 reach within the preset range.

[0027] S3, open the second regulating valve 6, the second stop valve 8, the fourth stop valve 28, the third stop valve 20 on the first hot gas delivery branch pipe 19 connected to the second jacket pipe 7, and the third regulating valve 22 on the first exhaust gas emission branch pipe 21 connected to the second jacket pipe 7, and adjust the opening of the second regulating valve 6. At this time, the adhesive in the mixing tank 9 is uniformly transported to the quantitative tank 5 through the inner cavity of the second jacket pipe 7. During this period, the opening of the third regulating valve 22 on the first exhaust gas emission branch pipe 21 connected to the second jacket pipe 7 is further adjusted until the second temperature sensor 23 on the first exhaust gas emission branch pipe 21 connected to the second jacket pipe 7 is always within the preset range. When the liquid level sensor 23 on the quantitative tank 5 is After the liquid level parameter fed back by the sensor 29 reaches the preset range, the quantitative adhesive is obtained, and since the adhesive enters the quantitative tank 5, the gas discharged outwardly from the quantitative tank 5 is discharged outwardly through the second hot gas delivery branch pipe 24, the second tail gas discharge branch pipe 26 and the tail gas discharge main pipe 11 in sequence; finally, the fourth stop valve 28, the second regulating valve 6 and the second stop valve 8 are closed, but the third stop valve 20 on the first hot gas delivery branch pipe 19 connected to the second jacket pipe 7 and the third regulating valve 22 on the first tail gas discharge branch pipe 21 connected to the second jacket pipe 7 are still kept open, so as to achieve the heat preservation of the purifying agent in the inner tube of the second jacket pipe by using the hot gas of the hot gas delivery main pipe 10.

[0028] S4, open the fifth stop valve 35 and the second drive motor 39, at this time, the solid raw material stored in the solid raw material storage tank 33 is decelerated by the feeder 36 and then transported to the weighing tank 37 for weighing. When the weight fed back by the weighing tank 37 reaches the preset range, close the fifth stop valve 35 and the second drive motor 39, and open the sixth stop valve 38. At this time, the solid raw material weighed by the weighing tank 37 is transported to the feed pipe of the wet granulator 1.

[0029] S5, open the first regulating valve 2, the first stop valve 4, the third stop valve 20 on the first hot gas delivery branch pipe 19 connected to the first jacket pipe 3, the third regulating valve 22 and the fourth regulating valve 27 on the first exhaust gas emission branch pipe 21 connected to the first jacket pipe 3, adjust the opening of the first regulating valve 2 to a preset range until the liquid level parameter fed back by the liquid level sensor 29 on the quantitative tank 5 decreases at a preset speed, and in the process, further adjust the opening of the fourth regulating valve 27 until the second pressure sensor 25 is always within the preset range, and the partially heated compressed air stored in the buffer tank 17 is continuously delivered to the given amount tank 5 through the second hot gas delivery branch pipe 24, so as to maintain the above-mentioned quantitative adhesive liquid level, and The pressure above the quantitative adhesive liquid level is maintained stable, so that the quantitative adhesive is uniformly delivered to the infusion nozzle of the wet granulator 1; then, the staff observes through the first observation window 40 and the second observation window 41 that the purifying agent in the inner tube of the first jacket tube 3 is completely delivered to the infusion nozzle of the wet granulator 1, and the infusion nozzle of the wet granulator 1 continues to uniformly deliver the adhesive to the solid raw material in a stirring state; finally, the first regulating valve 2, the first stop valve 4 and the fourth regulating valve 27 are closed and the fourth stop valve 28 is opened. At this time, the excess heated gas in the quantitative tank 5 is discharged outward through the second hot gas delivery branch pipe 24, the second tail gas exhaust branch pipe 26 and the tail gas exhaust main pipe 11 in sequence.

[0030] During the process from step S3 to step S5, if the parameter fed back by the first pressure sensor 18 on the buffer tank 17 is lower than the preset range, it is necessary to turn on the air compression unit 14 and the electric heater 15 again. At this time, the outside air is filtered by the self-cleaning air filter 12 for mechanical impurities and then enters the hot air delivery main pipe 10 and is then heated by the electric heater 15 before being supplemented and delivered to the buffer tank 17, so that the parameter fed back by the first pressure sensor 18 on the buffer tank 17 is always within the preset range.

[0031] According to this embodiment, the adhesive in the inner tube of the second jacket tube 7 is kept warm by conveying heated compressed air into the intertube cavity of the second jacket tube 7, thereby avoiding a temperature drop caused by heat exchange between the adhesive temporarily stored in the inner tube of the second jacket tube 7 and the outside, and the adhesive in the inner tube of the first jacket tube 3 is kept warm by conveying heated compressed air into the intertube cavity of the first jacket tube 3, thereby reducing a temperature drop of the adhesive that has been quantitatively conveyed during the process of conveying to the wet granulator.

[0032] The embodiments described above are only preferred embodiments of the present invention and are not intended to limit the scope of implementation of the present invention. Therefore, any equivalent changes or modifications made based on the structures, features and principles described in the patent scope of the present invention should be included in the patent application scope of the present invention.

Claims

1. A raw material conveying device for a wet granulator, comprising a wet granulator (1), wherein the wet granulator (1) comprises a feed pipe and an infusion nozzle, and is characterized in that: The infusion nozzle of the wet granulator (1) is provided with a first regulating valve (2), a first jacket tube (3) is provided above the first regulating valve (2), a first stop valve (4) is provided above the first jacket tube (3), a quantitative tank (5) is provided above the first stop valve (4), a second regulating valve (6) is provided above the quantitative tank (5), a second jacket tube (7) is provided above the second regulating valve (6), a second stop valve (8) is provided above the second jacket tube (7), a mixing tank (9) is provided above the second stop valve (8), and the mixing tank (9) comprises a tank body and a tank body provided outside the tank body. The first jacket tube (3) and the second jacket tube (7) each comprise an inner tube, an outer tube arranged outside the inner tube, and an intertube cavity arranged between the inner tube and the outer tube; the inner cavity of the mixing tank (9) is connected to the inner tube of the first jacket tube (3); the inner tube of the first jacket tube (3) and the inner tube of the second jacket tube (7) are connected via the inner cavity of the quantitative tank (5); the valve cavity of the first regulating valve (2) and the valve cavity of the first stop valve (4) are connected via the inner tube of the first jacket tube (3); and the valve cavity of the second regulating valve (6) and the valve cavity of the second stop valve (8) are connected via the inner tube of the second jacket tube (7).

2. The raw material conveying device of the wet granulator according to claim 1, characterized in that: The inter-tube cavity of the first jacketed tube (3) and the inter-tube cavity of the second jacketed tube (7) are connected to a hot gas transport main pipe (10) and an exhaust gas exhaust main pipe (11); a self-cleaning air filter (12), a one-way valve (13), an air compressor unit (14), an electric heater (15), a first temperature sensor (16) and a buffer tank (17) are arranged on the hot gas transport main pipe (10) in sequence from the inlet end of the hot gas transport main pipe (10) to the outlet end of the hot gas transport main pipe (10); and a first pressure sensor (18) is arranged on the buffer tank (17).

3. The raw material conveying device of the wet granulator according to claim 2, characterized in that: The inter-tube cavity of the first jacketed tube (3) and the hot gas transport main pipe (10) as well as the inter-tube cavity of the second jacketed tube (7) and the hot gas transport main pipe (10) are respectively connected via a first hot gas transport branch pipe (19), and each first hot gas transport branch pipe (19) is respectively provided with a third stop valve (20); the inter-tube cavity of the first jacketed tube (3) and the exhaust gas emission main pipe (11) as well as the inter-tube cavity of the second jacketed tube (7) and the exhaust gas emission main pipe (11) are respectively connected via a first exhaust gas emission branch pipe (21), and each first exhaust gas emission branch pipe (21) is respectively provided with a third regulating valve (22) and a second temperature sensor (23).

4. The raw material conveying device of the wet granulator according to claim 2, characterized in that: The top of the quantitative tank (5) and the hot gas transport main pipe (10) are connected via a second hot gas transport branch pipe (24); a second pressure sensor (25), an inlet end of a second exhaust gas discharge branch pipe (26) and a fourth regulating valve (27) are sequentially arranged on the second hot gas transport branch pipe (24) in a direction from close to the quantitative tank (5) to far away from the quantitative tank (5); the outlet end of the second exhaust gas discharge branch pipe (26) is connected to the exhaust gas discharge main pipe (11); and a fourth stop valve (28) is arranged on the second exhaust gas discharge branch pipe (26).

5. The raw material conveying device of the wet granulator according to claim 1, characterized in that: The tank bodies of the quantitative tank (5) and the mixing tank (9) are each provided with a liquid level sensor (29).

6. The raw material conveying device of the wet granulator according to claim 1, characterized in that: The tank body of the mixing tank (9) is provided with a stirring device, and the stirring device comprises a driving shaft (30) provided on the tank body of the mixing tank (9), a stirring blade (31) provided on the driving shaft (30) inside the tank body of the mixing tank (9), and a first driving motor (32) drivingly connected to the driving shaft (30).

7. The raw material conveying device of the wet granulator according to claim 1, characterized in that: A solid raw material storage tank (33) is arranged above the feed pipe of the wet granulator (1); a solid raw material delivery pipe (34) is connected between the solid raw material storage tank (33) and the wet granulator (1); a fifth stop valve (35), a feeder (36), a weighing tank (37) and a sixth stop valve (38) are arranged in sequence from top to bottom on the solid raw material delivery pipe (34); and a second drive motor (39) is transmission-connected to the feeder (36).

Images