Feeding assembly protected by nitrogen

Abstract

The utility model belongs to the technical field of peptidic acid-containing reactant processing, and particularly relates to a nitrogen protection feeding assembly which comprises a reaction kettle, a kettle cover is arranged on the upper side of the reaction kettle, a discharging port is communicated with one side of the lower side face of the reaction kettle, a discharging valve is arranged at the lower end of the discharging port, and a supporting seat is arranged on the lower side of the reaction kettle in a sleeved mode. Foot rods are arranged around the lower side of the supporting seat, and a dripping mechanism is arranged on one side of the upper side face of the kettle cover. When the spiral feeding plate rotates, the inner side wall of the dripping pipe can be continuously and spirally scraped, and a solution hung on the wall can be conveyed to the lower end of the dripping pipe to be discharged under the spiral pushing effect, so that the peptidic acid-containing reactant solution is effectively prevented from being hung on the wall, the solution is prevented from being left in the dripping pipe, and the service life of the peptidic acid-containing reactant solution is prolonged. The residual peptide-containing reactant is prevented from reacting with residual oxygen to generate a small amount of yellow crystalline polymer, and the influence on normal dripping during subsequent reprocessing is avoided.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of peptide-containing acid reactant processing, and particularly relates to a nitrogen-protection feeding assembly. BACKGROUND

[0002] The peptide-containing acid reactant has strong oxidizability in oxygen, and when dropping the reactant into a reaction kettle through a dropping pipe, nitrogen is generally blown out from the lower side of the dropping pipe to protect the dropping peptide-containing acid reactant from reacting with oxygen in the reaction kettle and crystallizing to form polymer spheres at the position of the pipe opening of the dropping pipe, thereby affecting normal dropping of the dropping pipe.

[0003] At present, a tee joint is generally used to connect a nitrogen pipe and a material pipe, the lower side of the tee joint penetrates into the inside of the reaction kettle to connect a nitrogen blowing pipe and the dropping pipe, the nitrogen blowing pipe is sleeved on the outside of the dropping pipe, and a gap between the nitrogen blowing pipe and the dropping pipe is used as a nitrogen passage, the dropping pipe is communicated with the material pipe through the tee joint, and the nitrogen blowing pipe is communicated with the nitrogen pipe through the tee joint, in this way, the material pipe feeds material into the dropping pipe, the peptide-containing reactant continuously drops from the pipe opening of the dropping pipe, and the nitrogen blowing pipe can continuously blow out nitrogen around the pipe opening of the dropping pipe to avoid oxygen gathering around the pipe opening of the dropping pipe and reacting with the peptide-containing reactant.

[0004] However, the peptide-containing reactant solution will have a certain wall-hanging phenomenon when being transported in the pipeline, when the last reactant is dropped, part of the peptide-containing reactant will be left in the dropping pipe, when the reaction ends, the nitrogen stops being sprayed, the remaining peptide-containing reactant gathers towards the pipe opening of the dropping pipe, and finally reacts with the residual oxygen in the reaction kettle, thereby producing a small amount of yellow crystalline polymer at the lower end of the pipe opening of the dropping pipe, and affecting normal dropping during subsequent reprocessing. UTILITY MODEL CONTENTS

[0005] In view of the above problems, the utility model aims to provide a nitrogen-protection feeding assembly to solve the problem that the peptide-containing reactant solution will have a certain wall-hanging phenomenon when being transported in the pipeline, when the last reactant is dropped, part of the peptide-containing reactant will be left in the dropping pipe, when the reaction ends, the nitrogen stops being sprayed, the remaining peptide-containing reactant gathers towards the pipe opening of the dropping pipe, and finally reacts with the residual oxygen in the reaction kettle, thereby producing a small amount of yellow crystalline polymer at the lower end of the pipe opening of the dropping pipe, and affecting normal dropping during subsequent reprocessing.

[0006] In order to achieve the above object, the utility model discloses the technical scheme that a kind of nitrogen protection's feeding assembly, including reaction kettle, the upside of the reaction kettle is provided with kettle cover, the downside of the reaction kettle side is connected with outlet, the lower end of the outlet is provided with discharge valve, the downside of the reaction kettle is sleeved with support seat, the downside of the support seat is surrounded with foot rod, the upside of the kettle cover side is provided with drop material mechanism, the drop material mechanism includes connector, air cavity, drop material pipe, air inlet, feed inlet, nitrogen tube, material pipe, threaded sleeve, motor two, shaft, spiral feeding plate, nitrogen blowing pipe, support ring and scraper, the inside of the connector is provided with air cavity, air cavity is connected with the downside of connector, the inside center of the air cavity is provided with drop material pipe, the upper end of the drop material pipe is closedly connected with the inside wall of air cavity, the two sides of the connector are provided with air inlet and feed inlet respectively, the air inlet is connected with nitrogen tube, the feed inlet is connected with material pipe, the air inlet is connected with air cavity and is communicated, the feed inlet is communicated with the inside of drop material pipe and is communicated, the lower side of the connector is inserted with nitrogen blowing pipe by air cavity, the drop material pipe is inserted with nitrogen blowing pipe to lower end, there is gap between the drop material pipe and nitrogen blowing pipe, the lower side of the outside of the connector is rotatably provided with threaded sleeve, the threaded sleeve is threadedly connected with kettle cover, the connector is connected with the downside of kettle cover, the upper side of the connector is provided with motor two, the output end of the motor two is connected with shaft in the inside of the connector and drop material pipe, the outside of the shaft is provided with spiral feeding plate, and the spiral feeding plate is attached to the inside wall of drop material pipe.

[0007] The utility model discloses the beneficial effect that: when spiral feeding plate rotates, the inside wall of drop material pipe is continuously scraped by spiral, and the solution on the wall is pushed to the lower end of drop material pipe and is discharged, so that the solution containing peptide acid reactant solution on the wall is effectively prevented, the solution in drop material pipe is avoided to remain, the residual peptide reactant and residual oxygen are avoided to react and produce a small amount of yellow crystalline polymer, and the normal drop material when subsequent processing is avoided to be affected.

[0008] In order to help the solution in the reaction kettle to react quickly;

[0009] As the further improvement of the above technical scheme: the upper center of the kettle cover is provided with motor one, and the output end of the motor one is provided with stirring rod and is communicated with the downside of the kettle cover.

[0010] The beneficial effect of the improvement is that: the output end of motor one drives stirring rod to rotate, which helps the solution in the reaction kettle to react quickly.

[0011] In order to exhaust and supplement oxygen to the reaction kettle;

[0012] As a further improvement of the above technical solution: the upper side of the kettle cover is provided with a gas pipeline on one side, and an oxygen concentration sensor is arranged on the upper side of the kettle cover, and the lower end of the oxygen concentration sensor penetrates the kettle cover to the lower side.

[0013] The beneficial effect of the improvement is that the oxygen concentration in the reaction kettle is monitored by the oxygen concentration sensor, and the exhaust device and the oxygen pipe are connected through the gas pipeline and the control valve, so that the reaction kettle can be exhausted and supplemented with oxygen.

[0014] In order to press the upper opening of the reaction kettle with the kettle cover;

[0015] As a further improvement of the above technical solution: the side of the kettle cover is fixedly provided with a fixed block one, a knob rod is inserted and connected on the upper side of the fixed block one, a fixed ring is threadedly connected on the upper side of the reaction kettle, a fixed block two is arranged around the fixed ring corresponding to the fixed block one, the lower end of the knob rod is threadedly connected with the fixed block two, and the lower side of the kettle cover is press-connected with the fixed ring.

[0016] The beneficial effect of the improvement is that the knob rod is screwed and connected with the fixed block two, so that the kettle cover is pressed tightly with the fixed ring, thereby pressing the upper opening of the reaction kettle with the kettle cover.

[0017] In order to adjust the height of the support seat;

[0018] As a further improvement of the above technical solution: the lower end of the foot rod is threadedly provided with a hexagonal threaded sleeve.

[0019] The beneficial effect of the improvement is that the hexagonal threaded sleeve is screwed to adjust the height of the support seat.

[0020] In order to keep the gap between the nitrogen blowing pipe and the dropping pipe stable;

[0021] As a further improvement of the above technical solution: support collars are arranged on the upper and lower sides between the inner side of the nitrogen blowing pipe and the dropping pipe, and mesh holes are uniformly provided on the outer side of the support collars.

[0022] The beneficial effect of the improvement is that the support collars are arranged to keep the gap between the nitrogen blowing pipe and the dropping pipe stable, and to avoid the inclination of the dropping pipe in the nitrogen blowing pipe.

[0023] In order to avoid the continuous accumulation of crystalline polymers;

[0024] As a further improvement of the above technical solution: the lower end of the dropping pipe protrudes from the nitrogen blowing pipe, the lower end of the shaft rod is provided with a scraper, and the upper side of the scraper is clamped with the end of the dropping pipe.

[0025] The beneficial effect of the improvement is that as the dropping of material proceeds, the lower end of the dropping pipe continuously sprays nitrogen, but due to the flow effect of oxygen and nitrogen, the sprayed nitrogen flow also disturbs the surrounding airflow, and a small amount of oxygen enters from the lower direction from the central gap of the nitrogen flow, approaches the dropping pipe and reacts with the peptide-containing reactant, which is the reason why a small amount of crystalline polymer is found at the lower end of the dropping pipe under the protection of nitrogen, although it does not have a significant impact on the dropping, but after accumulation, it still needs to be cleaned, and the scraper rotates with the shaft rod, which can cyclically scrape the lower end of the dropping pipe, automatically clean the lower end of the dropping pipe, thereby avoiding the continuous accumulation of crystalline polymer.

[0026] The parts not involved in the device are the same as or can be realized by the prior art. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of the utility model;

[0028] Figure 2 It is a structural schematic diagram of the kettle cover in the utility model;

[0029] Figure 3 It is a structural schematic diagram of the reaction kettle in the utility model;

[0030] Figure 4 It is a structural schematic diagram of the dropping mechanism in the utility model;

[0031] Figure 5 It is an inside structure sectional view of the connecting head in the utility model;

[0032] Figure 6 It is an inside structure sectional view of the nitrogen blowing pipe and the dropping pipe in the utility model;

[0033] Figure 7 It is an enlarged view of A in the utility model; Figure 6

[0034] In the figure: 1, reaction kettle; 2, kettle cover; 3, dropping mechanism; 31, connecting head; 32, air cavity; 33, dropping pipe; 34, gas inlet; 35, material inlet; 36, nitrogen pipe; 37, material pipe; 38, threaded sleeve; 39, motor two; 310, shaft rod; 311, spiral feeding plate; 312, nitrogen blowing pipe; 313, support ring; 314, scraper; 4, gas pipeline; 5, oxygen concentration sensor; 6, motor one; 7, stirring rod; 8, fixed block one; 9, knob rod; 10, fixed ring; 11, fixed block two; 12, discharge port; 13, discharge valve; 14, support seat; 15, foot rod; 16, hexagonal threaded sleeve. DETAILED DESCRIPTION

[0035] ​In order to make the technical solution of the present application better understood by those skilled in the art, the present application will be described in detail below with reference to the drawings, and the description in this part is only exemplary and explanatory, and should not have any limiting effect on the protection scope of the present application.

[0036] As Figure 1 — Figure 7The utility model provides a nitrogen protection feeding assembly, including the reation kettle 1, the upside of reation kettle 1 is equipped with the kettle cover 2, the downside of reation kettle 1 side is connected with the discharge port 12, the lower end of discharge port 12 is equipped with the discharge valve 13, the downside of reation kettle 1 is sleeved with the support seat 14, the downside of support seat 14 is surrounded with the foot pole 15, the upside side of kettle cover 2 is equipped with the dripping mechanism 3, and the dripping mechanism 3 includes the connecting head 31, gas cavity 32, dripping pipe 33, air inlet 34, feed inlet 35, nitrogen tube 36, material pipe 37, threaded sleeve 38, motor two 39, shaft 310, spiral feeding plate 311, nitrogen blowing pipe 312, support ring 313 and scraper 314, the inside of connecting head 31 is equipped with gas cavity 32, and gas cavity 32 is connected through connecting head 31 to the downside, the inside center of gas cavity 32 is equipped with dripping pipe 33, and the upper end of dripping pipe 33 is closedly connected with the inside wall of gas cavity 32, the both sides of connecting head 31 are equipped with air inlet 34 and feed inlet 35 respectively, air inlet 34 is connected with nitrogen tube 36, feed inlet 35 is connected with material pipe 37, air inlet 34 is connected through connecting head 31 with gas cavity 32, feed inlet 35 is connected through connecting head 31 with the inside of dripping pipe 33, the downside of connecting head 31 is inserted with nitrogen blowing pipe 312 through gas cavity 32, and dripping pipe 33 is inserted with nitrogen blowing pipe 312 to the lower end, and there is a gap between dripping pipe 33 and nitrogen blowing pipe 312, the downside of the outside of connecting head 31 is rotatably provided with threaded sleeve 38, threaded sleeve 38 is threadedly connected with kettle cover 2, connecting head 31 is connected through kettle cover 2 to the downside, the upside of connecting head 31 is equipped with motor two 39, the output end of motor two 39 is connected through connecting head 31 with the inside of dripping pipe 33 and is equipped with shaft 310, the outside of shaft 310 is equipped with spiral feeding plate 311, spiral feeding plate 311 is attached with the inside wall of dripping pipe 33, when spiral feeding plate 311 rotates, the inside wall of dripping pipe 33 is continuously scraped, the solution on the wall is pushed to the lower end of dripping pipe 33 and is discharged, thereby effectively preventing the solution containing peptide acid reactant from sticking to the wall, avoiding the solution remaining in dripping pipe 33, avoiding the residual peptide reactant and residual oxygen reacting to produce a small amount of yellow crystalline polymer, and avoiding affecting the normal dripping during subsequent processing again, the upside center of kettle cover 2 is equipped with motor one 6, the output end of motor one 6 is connected through kettle cover 2 to the downside and is equipped with stirring rod 7, the output end of motor one 6 drives stirring rod 7 to rotate, which helps the solution in reation kettle 1 to react quickly, the upside side of kettle cover 2 is connected with gas pipeline 4, the upside side of kettle cover 2 is equipped with oxygen concentration sensor 5, the lower end of oxygen concentration sensor 5 is connected through kettle cover 2 to the downside, the oxygen concentration in reation kettle 1 is monitored through oxygen concentration sensor 5, and the exhaust device and oxygen tube are connected with control valve through gas pipeline 4, so that reation kettle 1 can be exhausted and supplemented with oxygen,The side of the kettle cover 2 is fixedly provided with a fixed block one 8, the upper side of the fixed block one 8 is insertedly provided with a knob rod 9, the upper side of the reaction kettle 1 is threadedly connected with a fixed ring 10, the periphery of the fixed ring 10 is correspondingly provided with a fixed block two 11, the lower end of the knob rod 9 is threadedly connected with the fixed block two 11, the lower side of the kettle cover 2 is press-connected with the fixed ring 10, the knob rod 9 is screwed with the fixed block two 11 to press the fixed ring 10, so that the kettle cover 2 press the upper opening of the reaction kettle 1, the lower end of the foot rod 15 is threadedly provided with a hexagonal threaded sleeve 16, the hexagonal threaded sleeve 16 is screwed to adjust the height of the supporting seat 14, the upper and lower sides between the inner side of the nitrogen blowing pipe 312 and the dropping pipe 33 are both provided with supporting sleeve rings 313, the outer side of the supporting sleeve ring 313 is uniformly and throughly provided with mesh holes, the supporting sleeve ring 313 keeps the gap between the nitrogen blowing pipe 312 and the dropping pipe 33 stable, avoids the dropping pipe 33 to be inclined in the nitrogen blowing pipe 312, the lower end of the dropping pipe 33 protrudes from the nitrogen blowing pipe 312, the lower end of the shaft rod 310 is provided with a scraper 314 on one side, the upper side of the scraper 314 is clamped with the end of the dropping pipe 33, the scraper 314 rotates with the shaft rod 310, can cyclically scrape the lower end of the dropping pipe 33, automatically cleans the lower end of the dropping pipe 33, so that the crystalline polymer is not continuously accumulated.

[0037] The working principle and use process of the utility model are as follows:

[0038] In use, the material pipe 37 feeds material into the drop pipe 33 through the inlet 35, the nitrogen pipe 36 sends nitrogen into the air cavity 32 through the inlet 34, the nitrogen enters the inside of the nitrogen blowing pipe 312 through the air cavity 32, and finally, the nitrogen is blown out from the lower end of the nitrogen blowing pipe 312 around the drop pipe 33. The motor 2 39 is started,The output end of the motor two 39 drives the screw feeding plate 311 to rotate through the shaft rod 310. When the screw feeding plate 311 rotates, it feeds the lower end of the dropping tube 33. When the screw feeding plate 311 rotates, it continuously scratches the inner wall of the dropping tube 33. The solution hanging on the wall will be pushed by the screw and sent to the lower end of the dropping tube 33 for discharge, thereby effectively preventing the solution containing peptide acid reactant from hanging on the wall, avoiding the residual solution in the dropping tube 33, avoiding the reaction between the residual peptide reactant and the residual oxygen to produce a small amount of yellow crystalline polymer, and avoiding affecting the normal dropping during subsequent processing. In addition, in use, the upper side of the kettle cover 2 is provided with a motor one 6, the output end of the motor one 6 penetrates the kettle cover 2 to the lower side and is provided with a stirring rod 7, the output end of the motor one 6 drives the stirring rod 7 to rotate, which helps the solution in the reaction kettle 1 to react quickly. In addition, in use, the upper side of the kettle cover 2 is provided with a gas pipeline 4 on one side, and an oxygen concentration sensor 5 is arranged on the upper side of the kettle cover 2. The lower end of the oxygen concentration sensor 5 penetrates the kettle cover 2 to the lower side. The oxygen concentration in the reaction kettle 1 is monitored by the oxygen concentration sensor 5. The gas pipeline 4 is connected to the control valve to connect the exhaust device and the oxygen pipe, so that the reaction kettle 1 can be exhausted and supplemented with oxygen. In addition, in use, the side of the kettle cover 2 is fixedly provided with a fixed block one 8, the upper side of the fixed block one 8 is insertedly provided with a knob rod 9, the upper side of the reaction kettle 1 is threadedly connected with a fixed ring 10, the fixed ring 10 is provided with a fixed block two 11 around the four sides corresponding to the fixed block one 8, the lower end of the knob rod 9 is threadedly connected with the fixed block two 11, and the lower side of the kettle cover 2 is press-connected with the fixed ring 10. By screwing the knob rod 9 and the fixed block two 11, the kettle cover 2 is press-connected with the fixed ring 10, so that the kettle cover 2 is press-connected with the upper opening of the reaction kettle 1. In addition, in use, the lower end of the foot rod 15 is threadedly provided with a hexagonal threaded sleeve 16, and the hexagonal threaded sleeve 16 is screwed to adjust the height of the supporting seat 14. In addition, in use, support sleeve rings 313 are arranged between the inner side of the nitrogen blowing pipe 312 and the dropping tube 33 on the upper and lower sides, the outer sides of the support sleeve rings 313 are uniformly provided with mesh holes, the support sleeve rings 313 are arranged to keep the gap between the nitrogen blowing pipe 312 and the dropping tube 33 stable, and the dropping tube 33 is prevented from tilting in the nitrogen blowing pipe 312. In addition, in use, as the dropping proceeds, the lower end of the dropping tube 33 continuously sprays nitrogen, but due to the flow effect of oxygen and nitrogen, the nitrogen flow will also disturb the surrounding airflow, and a small amount of oxygen will enter from the lower end to the center gap of the nitrogen flow, and will contact the peptide reactant close to the dropping tube 33. This is the reason why a small amount of crystalline polymer is found at the lower end of the dropping tube 33 under the protection of nitrogen. Although it does not have a significant impact on dropping, it still needs to be cleaned after accumulation. The scraper 314 is arranged to rotate with the shaft rod 310, which can cyclically scrape the lower end of the dropping tube 33 and automatically clean the lower end of the dropping tube 33, thereby avoiding the continuous accumulation of crystalline polymer.

[0039] It should be noted that, in this document, the terms "comprises", "comprising", or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can also include other elements not expressly listed or inherent to such process, method, article, or apparatus.

[0040] The principles and implementations of the present application are described in the specific examples herein, and the above examples are only used to help understand the method of the present application and its core idea. The above description is only the preferred embodiments of the present application. It should be noted that due to the limited nature of the language, there are objectively infinite specific structures, and for ordinary skilled persons in the technical field, without departing from the principles of the present application, a number of improvements, refinements or changes can be made, or the above technical features can be combined in an appropriate manner; these improvements, refinements, changes or combinations, or the application of the inventive concept and technical solution to other occasions without improvement, shall be regarded as the protection scope of the present application.

Claims

1. A nitrogen-protected feeding assembly, characterized in that: The reactor includes a reactor (1), a lid (2) is provided on the upper side of the reactor (1), a discharge port (12) is provided on one side of the lower side of the reactor (1), a discharge valve (13) is provided at the lower end of the discharge port (12), a support base (14) is sleeved on the lower side of the reactor (1), a foot rod (15) is arranged around the lower side of the support base (14), and a dripping mechanism (3) is provided on one side of the upper side of the lid (2). The dripping mechanism (3) includes a connector (31), an air chamber (32), a dripping pipe (33), an air inlet (34), a feed inlet (35), a nitrogen pipe (36), a material pipe (37), a threaded sleeve (38), a second motor (39), a shaft (310), a spiral feed plate (311), a nitrogen blowing pipe (312), a support collar (313), and a scraper (314). The air chamber (32) is provided on the inner side of the connector (31). 2) A drip pipe (33) is provided at the center of the inner side of the air chamber (32) through the connector (31) to the lower side. The upper end of the drip pipe (33) is closed and connected to the inner wall of the air chamber (32). An air inlet (34) and a feed inlet (35) are respectively provided on both sides of the connector (31). A nitrogen pipe (36) is connected to the air inlet (34), and a material pipe (37) is connected to the feed inlet (35). The air inlet (34) is connected through the connection. The head (31) is connected to the air chamber (32). The feed inlet (35) passes through the connector (31) and is connected to the inside of the dripping pipe (33). A nitrogen blowing pipe (312) is inserted into the lower side of the connector (31) through the air chamber (32). The dripping pipe (33) passes through the nitrogen blowing pipe (312) to the lower end. There is a gap between the dripping pipe (33) and the nitrogen blowing pipe (312). A threaded sleeve (38) is rotatably provided on the lower outer side of the connector (31). The threaded sleeve (38) is threadedly connected to the lid (2). The connector (31) passes through the lid (2) to the lower side. A motor (39) is provided on the upper side of the connector (31). The output end of the motor (39) passes through the connector (31) to the inner side of the dripping pipe (33) where a shaft (310) is provided. A spiral feeding plate (311) is provided on the outer side of the shaft (310). The spiral feeding plate (311) is in contact with the inner wall of the dripping pipe (33).

2. The nitrogen-protected feeding assembly according to claim 1, characterized in that: A motor (6) is provided at the center of the upper side of the lid (2), and the output end of the motor (6) passes through the lid (2) to the lower side where a stirring rod (7) is provided.

3. The nitrogen-protected feeding assembly according to claim 1, characterized in that: A gas pipeline (4) is connected to one side of the upper side of the lid (2), and an oxygen concentration sensor (5) is provided on one side of the upper side of the lid (2). The lower end of the oxygen concentration sensor (5) passes through the lid (2) to the lower side.

4. The nitrogen-protected feeding assembly according to claim 1, characterized in that: The side of the vessel lid (2) is fixedly surrounded by a fixing block 1 (8). A knob rod (9) is inserted into the upper side of the fixing block 1 (8). A fixing ring (10) is threadedly connected to the upper side of the reactor (1). A fixing block 2 (11) is provided around the fixing ring (10) corresponding to the fixing block 1 (8). The lower end of the knob rod (9) is threadedly connected to the fixing block 2 (11). The lower side of the vessel lid (2) is pressed against the fixing ring (10).

5. A nitrogen-protected feeding assembly according to claim 1, characterized in that: The lower end of the foot rod (15) is threaded with a hexagonal threaded sleeve (16).

6. The nitrogen-protected feeding assembly according to claim 1, characterized in that: Supporting collars (313) are provided on both the upper and lower sides of the inner side of the nitrogen blowing pipe (312) and the dripping pipe (33), and the outer side of the supporting collars (313) is uniformly perforated with mesh holes.

7. A nitrogen-protected feeding assembly according to claim 1, characterized in that: The lower end of the dripping tube (33) protrudes from the nitrogen blowing tube (312), and a scraper (314) is provided on one side of the lower end of the shaft (310). The upper side of the scraper (314) is engaged with the end of the dripping tube (33).

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