CN216887291U

CN216887291U - Dust packing apparatus

Info

Publication number: CN216887291U
Application number: CN202123199250.7U
Authority: CN
Inventors: 郑重; 董晴云; 周伟; 王梦兰; 张佳伟
Original assignee: Zhejiang Tianchuan Environmental Protection Technology Co ltd
Current assignee: Zhejiang Tianchuan Environmental Protection Technology Co ltd
Priority date: 2021-12-17
Filing date: 2021-12-17
Publication date: 2022-07-05
Anticipated expiration: 2031-12-17

Abstract

The utility model belongs to the technical field of dust collection, and relates to a dust packing device. The bag-type dust collector comprises a storage bin, wherein a rack is arranged on the storage bin, a through hole is formed in the storage bin, a waste gas box is arranged on the edge of the through hole, a bag-type dust collector is arranged in the waste gas box, and a negative pressure cavity is formed between the bag-type dust collector and the top of the waste gas box; the storage bin is respectively provided with a feed pipe and a discharge pipe, and the discharge pipe is provided with a discharge valve; a centrifugal fan is arranged on the waste gas box and is respectively connected with an exhaust pipe and an air inlet pipe; a vent pipe is connected between the waste gas tank and the discharge pipe, and the upper end and the lower end of the vent pipe are respectively communicated with the waste gas tank and the discharge pipe. The utility model has the advantages that: the powdery material is prevented from flying during bagging, and the environmental pollution is reduced.

Description

Dust packing apparatus

Technical Field

The utility model belongs to the technical field of dust collection, and relates to a dust packing device.

Background

Many current trades involve the emission problem of dust waste gas, and for example the powdery material of chemical plant needs to be transported and the packing in process of production, adopts ordinary charging devices often to cause very big raise dust and material loss, causes very big pollution to workshop and surrounding environment, and this kind of production mode can not satisfy the high-quality environmental protection production requirement of increasing day by day. The conventional charging devices have several drawbacks:

1. the charging is controlled manually, the material quantity is difficult to control accurately, and the charging is often too much or too little. Too little results in uneconomic results, and too much results in the escape of materials.

2. The charging device is not provided with a ventilating facility, so that dust flies during charging.

3. The material-filling bag is not sealed with the feed opening, so that dust escapes during feeding.

4. Low working efficiency and great environmental pollution.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a dust packing device aiming at the problems in the prior art, and the technical problems to be solved by the utility model are as follows: the powder material can avoid dust flying in the bagging process, and the environmental pollution is reduced.

The utility model is realized by the following technical scheme: a dust packing device comprises a storage bin, wherein a rack is fixedly arranged on the storage bin, a through hole is formed in the upper side face of the storage bin, a waste gas box is fixedly arranged on the edge of the through hole, the bottom of the waste gas box is open and is communicated with the through hole, a bag-type dust remover is arranged in the waste gas box, and a negative pressure cavity is formed between the bag-type dust remover and the top of the waste gas box; a feeding pipe is arranged on the upper side surface of the storage bin, a discharging pipe is arranged on the lower side surface of the storage bin, and a discharging valve is arranged on the discharging pipe; a centrifugal fan is arranged on the waste gas box, an air inlet end and an air outlet end of the centrifugal fan are respectively connected with an air outlet pipe and an air inlet pipe, the air inlet pipe is communicated with the negative pressure cavity, and the air outlet pipe is communicated with the outside air; a vent pipe is connected between the waste gas box and the discharge pipe, the upper end of the vent pipe is communicated with the waste gas box, the end part of the vent pipe is positioned below the bag-type dust remover, and the lower end of the vent pipe is communicated with the discharge pipe.

In the above dust packing device, the discharge pipe includes an upper discharge pipe, a bellows and a lower discharge pipe, the upper end of the upper discharge pipe is communicated with the storage bin, the lower end of the upper discharge pipe is connected with the upper end of the bellows, the upper end of the lower discharge pipe is connected with the lower end of the bellows, and the lower end of the lower discharge pipe is communicated with the outside; the discharge valve is positioned on the upper discharge pipe, and the lower end of the vent pipe is communicated with the upper discharge pipe.

In the above dust packing device, an annular pipe is fixedly arranged on the peripheral wall of the upper discharge pipe, a plurality of air inlets are circumferentially arranged on the inner wall of the upper discharge pipe, and the annular pipe is communicated with the inside of the upper discharge pipe through the air inlets; the annular pipe is connected with the lower end of the vent pipe.

In the above dust packing device, the lower discharging pipe is provided with a plurality of clamping mechanisms, each clamping mechanism comprises a fixed seat and a hinge rod, the fixed seat is fixedly arranged on the lower discharging pipe, an air cylinder is hinged on the lower side surface of the fixed seat, and a piston rod is arranged on the air cylinder in a sliding manner; the upper end of the hinged rod is hinged to the lower discharge pipe and located below the fixed seat, the lower end of the hinged rod is fixedly provided with a cross rod, the free end of the cross rod is fixedly provided with an arc plate, the arc plate is matched with the lower discharge pipe, a strip-shaped hole is formed in the hinged rod along the length direction, a sliding block is arranged in the strip-shaped hole in a sliding mode, and the sliding block is hinged to the free end of the piston rod; when the cylinder drives the piston rod to extend, the piston rod enables the hinged rod to rotate anticlockwise around the hinged point through the sliding block, and the circular arc plate can be clamped on the pipe wall of the lower discharging pipe.

In foretell dust packing device, still include air compressor, air compressor inlet end and exhaust end are connected with the air respectively and advance pipe and blowback pipe, the air advances the outside pipe intercommunication, the blowback pipe stretches into negative pressure intracavity and tip and seals, is located be equipped with a plurality of breather pipe along length direction on the blowback pipe of negative pressure intracavity, the breather pipe is corresponding with the sack cleaner.

In foretell dust packing device, still include weighing platform and controller, weighing platform is located the below of discharging pipe, weighing platform bottom is equipped with a plurality of weighing sensor, the controller is connected with weighing sensor and bleeder valve electricity respectively through external power source.

Compared with the prior art, the device has the following advantages:

1. through the arrangement of the negative pressure cavity, the vent pipe, the discharge pipe and other components, the centrifugal fan sucks air which is generated in the feeding process and is discharged upwards in the charging and packaging bag, so that the air in the charging and packaging bag is replaced and discharged in time, the powdery material stably drops, the charging working time is shortened, and the working efficiency is further improved; the setting of sack cleaner makes the powdery material in this device exhaust air all filtered out by it, and exhaust air reaches exhaust emission standard, effectively reduces environmental pollution.

2. The cylinder passes through parts such as hinge bar, horizontal pole and circular arc board, fixes and seals the feed inlet on discharging pipe down, and this structure adopts pneumatic type clamping mechanism, has good sealed and tight effect of clamp, avoids the powdered material loss, and makes the installation of the packing bag of feeding, change convenient rapidly more.

3. The weight of the charging packaging bag is converted into an electric signal through the weighing sensor and then transmitted to the controller, after the charging packaging bag reaches a certain weight, the controller receives the electric signal transmitted by the weighing sensor, the discharge valve is closed in time through the external power supply, and therefore the weight of the charging packaging bag is accurately measured, and automatic accurate control of charging work is achieved. Through parts such as controller, weighing platform and weighing sensor, the degree of automation and the work efficiency of this device are effectively improved.

Drawings

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

Fig. 2 is an enlarged view of a structure at a in fig. 1.

FIG. 3 is a schematic illustration of the tapping pipe according to the utility model.

Fig. 4 is an enlarged view of a structure at B in fig. 1.

In the figure, 1, a storage bin; 11. a frame; 12. a feeding pipe; 121. a filter plate; 2. an exhaust gas tank; 21. a negative pressure chamber; 22. a bag-type dust collector; 3. a discharge pipe; 31. a discharge valve; 32. feeding a discharge pipe; 321. an annular tube; 322. an air inlet; 33. discharging a pipe downwards; 34. a bellows; 35. positioning plates; 4. a weighing platform; 41. a weighing sensor; 42. a controller; 5. a clamping mechanism; 6. filling and bagging; 61. a feed inlet; 62. hooking; 7. a centrifugal fan; 71. an exhaust pipe; 72. an air inlet pipe; 73. a gas permeable pipe; 8. an air compressor; 81. an air inlet pipe; 82. a blowback pipe; 83. a breather pipe; 9. a cylinder; 91. a fixed seat; 92. a hinged lever; 921. a strip-shaped hole; 922. a slider; 93. a cross bar; 94. a circular arc plate; 95. a piston rod.

Detailed Description

The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.

Referring to fig. 1 to 4, in the dust packing device, a through hole 23 is formed in the upper side surface of a storage bin 1, a waste gas tank 2 is fixedly arranged on the edge of the through hole 23, the bottom of the waste gas tank 2 is open and is communicated with the through hole 23, a bag-type dust collector 22 is arranged in the waste gas tank 2, and a negative pressure cavity 21 is formed between the bag-type dust collector 22 and the top of the waste gas tank 2; a feeding pipe 12 is arranged on the upper side surface of the storage bin 1, the lower end of the feeding pipe 12 is communicated with the storage bin 1, a discharging pipe 3 is arranged on the lower side surface of the storage bin 1, a discharging valve 31 is arranged on the discharging pipe 3, and the discharging valve 31 can be a pneumatic discharging valve; a centrifugal fan 7 is arranged on the waste gas box 2, an exhaust end and an air inlet end of the centrifugal fan 7 are respectively connected with an exhaust pipe 71 and an air inlet pipe 72, the air inlet pipe 72 is communicated with the negative pressure cavity 21, and the exhaust pipe 71 is communicated with the outside air; a vent pipe 73 is connected between the waste gas tank 2 and the discharge pipe 3, the upper end of the vent pipe 73 is communicated with the waste gas tank 2, the end part of the vent pipe is positioned between the through hole 23 and the bag-type dust collector 22, and the lower end of the vent pipe 73 is communicated with the discharge pipe 3.

When the device works, the discharge valve 31 is closed, and the feed inlet 61 of the charging packaging bag 6 is arranged on the discharge pipe 3. The powdery material enters the storage silo 1 through the feed pipe 12. Then, the centrifugal fan 7 is started and the discharge valve 31 is opened, and the powdery material enters the charging and packaging bag 6 through the discharge pipe 3 under the action of self gravity. In the process, the centrifugal fan 7 discharges the air in the negative pressure chamber 21 to the external environment through the air inlet pipe 72 and the air outlet pipe 71. At the moment, because the air pressure of the storage bin 1 is greater than the air pressure in the negative pressure cavity 21, the air in the storage bin 1 enters the negative pressure cavity 21 through the through hole 23, and when the powdery materials in the air pass through the bag-type dust collector 22, the powdery materials are filtered out by the bag-type dust collector 22, so that the waste gas emission standard is reached, the content of the powdery materials in the air discharged by the centrifugal fan 7 is effectively reduced, and the dust pollution is avoided.

Meanwhile, after the charging and packaging bag 6 feeds, air in the charging and packaging bag 6 is upwards discharged, and when the air passes through the discharge pipe 3, the centrifugal fan 7 sucks the air into the waste gas box 2 through the vent pipe 73, so that the air quantity of the air entering the storage bin 1 is effectively reduced, the flying of powdery materials in the storage bin 1 is greatly reduced, the powdery materials stably drop into the charging and packaging bag 6, the charging and packaging bag 6 is convenient to charge, the working time of charging is further shortened, and the working efficiency is effectively improved. After the powdery materials in the air are filtered by the bag-type dust collector 22, the powdery materials are discharged from the waste gas box 2, so that the waste gas discharge standard is achieved, and the dust pollution is further reduced.

In the process, through the structural design of the negative pressure cavity 21, the vent pipe 73 and the discharge pipe 3, the centrifugal fan 7 sucks the air which is discharged upwards and generated in the feeding process of the charging and packaging bag 6, so that the air in the charging and packaging bag 6 is replaced and discharged in time, the powdery material stably drops, and the working efficiency is further improved; the setting of sack cleaner 22 makes the powdery material in this device exhaust air all filtered out by it, and exhaust air reaches exhaust emission standard, effectively reduces environmental pollution.

Further, a filter plate 121 is hinged to the edge of the upper end of the feeding pipe 12.

Before the silo 1 is fed, the filter plate 121 is rotated counterclockwise about its hinge point, opening the upper end opening of the feed pipe 12. When the powder material in the storage bin 1 reaches a certain amount, the feeding is stopped, and then the filter plate 121 rotates clockwise around the hinge point, and the filter plate 121 covers the upper end of the feeding pipe 12. Due to the work of the centrifugal fan 7, outside air enters the storage bin 1 through the filter plate 121, and the filter plate 121 filters out powdery materials in the air, so that the dust pollution is further reduced. Meanwhile, when the air in the storage bin 1 overflows to the outside through the feeding pipe 12, the filter plate 121 can filter out the powdery material in the air.

Specifically, the discharge pipe 3 comprises an upper discharge pipe 32, a corrugated pipe 34 and a lower discharge pipe 33, the upper end of the upper discharge pipe 32 is communicated with the storage bin 1, the lower end of the upper discharge pipe 32 is connected with the upper end of the corrugated pipe 34, the upper end of the lower discharge pipe 33 is connected with the lower end of the corrugated pipe 34, and the lower end of the lower discharge pipe 33 is communicated with the outside; the discharge valve 31 is positioned on the upper discharge pipe 32, and the lower end of the vent pipe 73 is communicated with the upper discharge pipe 32.

The lower discharging pipe 33 is conveniently moved up and down through the corrugated pipe 34, so that the height position of the lower discharging pipe 33 is adjusted, and the filling packaging bag 6 is suitable for being butted with the lower discharging pipe 33. Specifically, an annular pipe 321 is fixedly arranged on the peripheral wall of the upper discharge pipe 32, a plurality of air inlet holes 322 are circumferentially arranged on the inner wall of the upper discharge pipe 32, and the annular pipe 321 is communicated with the inside of the upper discharge pipe 32 through the air inlet holes 322; the annular pipe 321 is connected with the lower end of the vent pipe 73.

When the centrifugal fan 7 is operated, air in the discharge pipe 3 flows into the vent pipe 73 through the air inlet hole 322 and the annular pipe 321. The setting of annular pipe 321 and inlet port 322 helps emptying discharging pipe 3 and the air in the packing bag of feeding 6 fast, improves work efficiency, and inlet port 322 keeps away from packing bag of feeding 6, effectively reduces the suction of powdery material.

Further, the air intake holes 322 are disposed obliquely downward.

This structure facilitates the flow of air in the discharge pipe 3 and the charge bag 6 into the annular pipe 321. In addition, the powdery material is difficult to be sucked into the air inlet hole 322 due to the power and the gravitational potential energy of the powdery material in the falling process of the discharge pipe 3, and therefore, the structure effectively reduces the suction amount of the powdery material.

Specifically, the lower discharging pipe 33 is provided with a plurality of clamping mechanisms 5, the number of the clamping mechanisms 5 can be 2, each clamping mechanism 5 comprises a fixed seat 91 and a hinged rod 92, the fixed seat 91 is fixedly arranged on the lower discharging pipe 33, an air cylinder 9 is hinged on the lower side surface of the fixed seat 91, and a piston rod 95 is slidably arranged on the air cylinder 9; the upper end of the hinge rod 92 is hinged to the lower discharge pipe 33 and located below the fixed seat 91, the lower end of the hinge rod 92 is fixedly provided with a cross rod 93, the free end of the cross rod 93 is fixedly provided with an arc plate 94, the arc plate 74 is matched with the lower discharge pipe 33, the arc plate 94 is in a semi-arc shape, the hinge rod 92 is provided with a strip-shaped hole 921 along the length direction, a sliding block 922 is arranged in the strip-shaped hole 921 in a sliding mode, and the sliding block 922 is hinged to the free end of the piston rod 95; when the cylinder 9 extends the piston rod 95, the piston rod 95 via the sliding block 922 rotates the hinge lever 92 counterclockwise about the hinge point, at least one position exists at which the circular arc plate 94 can clamp onto the pipe wall of the lower tapping pipe 33.

Before the device works, the feeding hole 61 is sleeved on the lower discharging pipe 33 and is positioned between the two clamping mechanisms 5. At this moment, starting the cylinder 9, the cylinder 9 drives the piston rod 95 to extend, and the piston rod 95 drives the slider 922 to slide downwards along the length direction of the strip-shaped hole 921, so that the hinge rod 92 rotates anticlockwise around the hinge point. The hinged rod 92 drives the arc plate 94 to gradually approach the lower discharging pipe 33 through the cross rod 93 until the arc plate 94 clamps the feeding hole of the charging packaging bag 6 on the pipe wall of the lower discharging pipe 33, so as to play a role in fixing. At this time, the two arc plates 94 are spliced into a circular shape, and the feed port 61 and the pipe wall of the lower discharge pipe 33 form a sealing structure, so that the escape of the powdery material in the feeding process is avoided.

After the discharge valve 31 is opened, the powdery material falls into the charging and packaging bag 6 from the storage bin 1 through the discharge pipe 3 under the action of self gravity. In the process, due to the operation of the centrifugal fan 7, the air in the discharging pipe 3 and the charging and packaging bag 6 enters the waste gas tank 2 through the vent pipe 73 and is finally discharged out of the external environment, so that the air pressure in the charging and packaging bag 6 is smaller than the air pressure in the storage bin 1 and is in a negative pressure state. Consequently, at the 6 feeding in-process of the bale bag of feeding, the exhaust air that makes progress reduces, and powdery material drops steadily, more conveniently feeds the feeding of bale bag 6 to shorten the operating time of the packing of feeding, effectively improve work efficiency.

Above-mentioned in-process, cylinder 9 passes through parts such as hinge rod 92, horizontal pole 93 and circular arc board 94, fixes and seals feed inlet 61 on discharging pipe 33 down, and this structure adopts pneumatic type clamping mechanism 5, has good sealed and tight effect of clamp, avoids the powdery material loss, and makes the installation of the bag 6 of packing of feeding, change convenient more rapidly.

Furthermore, a plurality of positioning pieces 35 are fixedly arranged on the lower discharge pipe 33, the number of the positioning pieces 35 can be 4, a plurality of hooks 62 are arranged on the feed inlet 61 of the charging packaging bag 6, and the number of the hooks 62 can be 4.

Feed inlet 61 overlaps back on discharging pipe 33 down, and 4 couples 62 hang one by one on corresponding spacer 35, play the positioning action, and cylinder 9 drives circular arc board 94 through articulated rod 92 and horizontal pole 93, fixes feed inlet 61 and seals on discharging pipe 33 down to reduce the amount of labour, improve work efficiency.

Particularly, this device still includes

air compressor

8, 8 inlet ends of air compressor and exhaust end are connected with the air respectively and advance pipe 81 and blowback pipe 82, the air advances that pipe 81 communicates the external world, blowback pipe 82 stretches into in the negative pressure chamber 21 and the tip seals, is located be equipped with a plurality of breather pipe 83 along length direction on the blowback pipe 82 in the negative pressure chamber 21, breather pipe 83 is corresponding with sack cleaner 22.

After the work of packing of feeding, start air compressor 8, air compressor 8 advances pipe 81 and blowback pipe 82 through the air and discharges into exhaust gas tank 2 with external air in, makes the air current rush bag dust remover 22 through breather pipe 83, blows off the powdery material that will adhere to on bag dust remover 22, avoids bag dust remover 22 to be blockked up by powdery material, effectively improves bag dust remover 22's filtration efficiency.

Particularly, still include weighing platform 4 and controller 42, weighing platform 4 is located the below of discharging pipe 3, weighing platform 4 bottom is equipped with a plurality of weighing sensor 41, controller 42 is connected with weighing sensor 41 and bleeder valve 31 electricity respectively through external power source. Further, the controller 42 may be a PLC controller, and the discharge valve 31 may be a pneumatic discharge valve.

The packing bag of feeding 6 is placed on weighing platform 4, and the during operation, the weight of the packing bag of feeding 6 converts the signal of telecommunication into through weighing sensor 41, and the signal of telecommunication is given to controller 42 in the retransmission, and after packing bag of feeding 6 reached certain weight, the signal of telecommunication that weighing sensor 41 transmission was come was received to controller 42, makes bleeder valve 31 in time close through external power source to accurate measurement is fed the weight of packing bag of feeding 6, realizes the automatic accurate control of the work of feeding. The automation degree and the working efficiency of the device are effectively improved through the controller 42, the weighing platform 4, the weighing sensor 41 and other components.

The specific embodiments described herein are merely illustrative of the spirit of the utility model. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the utility model as defined in the appended claims.

Claims

1. A dust packing device comprises a storage bin (1), wherein a rack (11) is fixedly arranged on the storage bin (1), and the dust packing device is characterized in that a through hole (23) is formed in the upper side face of the storage bin (1), a waste gas box (2) is fixedly arranged on the edge of the through hole (23), the bottom of the waste gas box (2) is open and communicated with the through hole (23), a bag-type dust remover (22) is arranged in the waste gas box (2), and a negative pressure cavity (21) is formed between the bag-type dust remover (22) and the top of the waste gas box (2); a feeding pipe (12) is arranged on the upper side face of the storage bin (1), a discharging pipe (3) is arranged on the lower side face of the storage bin (1), and a discharging valve (31) is arranged on the discharging pipe (3); a centrifugal fan (7) is arranged on the waste gas box (2), an air inlet end and an air outlet end of the centrifugal fan (7) are respectively connected with an air outlet pipe (71) and an air inlet pipe (72), the air inlet pipe (72) is communicated with the negative pressure cavity (21), and the air outlet pipe (71) is communicated with outside air; a vent pipe (73) is connected between the waste gas tank (2) and the discharge pipe (3), the upper end of the vent pipe (73) is communicated with the waste gas tank (2), the end part of the vent pipe is positioned below the bag-type dust collector (22), and the lower end of the vent pipe (73) is communicated with the discharge pipe (3).

2. A dust baling device as defined in claim 1, wherein the discharging pipe (3) comprises an upper discharging pipe (32), a bellows (34) and a lower discharging pipe (33), the upper end of the upper discharging pipe (32) is connected to the storage bin (1), the lower end of the upper discharging pipe (32) is connected to the upper end of the bellows (34), the upper end of the lower discharging pipe (33) is connected to the lower end of the bellows (34), and the lower end of the lower discharging pipe (33) is connected to the outside; the discharge valve (31) is positioned on the upper discharge pipe (32), and the lower end of the vent pipe (73) is communicated with the upper discharge pipe (32).

3. The dust packing device according to claim 2, wherein the upper discharging pipe (32) is fixedly provided with an annular pipe (321) on the peripheral wall, the inner wall of the upper discharging pipe (32) is provided with a plurality of air inlet holes (322) along the circumferential direction, and the annular pipe (321) is communicated with the inside of the upper discharging pipe (32) through the air inlet holes (322); the annular pipe (321) is connected with the lower end of the vent pipe (73).

4. A dust packing apparatus according to claim 3, wherein a plurality of clamping mechanisms (5) are provided on the lower discharging pipe (33), the clamping mechanisms (5) comprise a fixing base (91) and a hinged rod (92), the fixing base (91) is fixedly provided on the lower discharging pipe (33), an air cylinder (9) is hinged on the lower side of the fixing base (91), and a piston rod (95) is slidably provided on the air cylinder (9); the upper end of the hinged rod (92) is hinged to the lower discharge pipe (33) and located below the fixed seat (91), the lower end of the hinged rod (92) is fixedly provided with a cross rod (93), the free end of the cross rod (93) is fixedly provided with an arc plate (94), the arc plate is matched with the lower discharge pipe (33), the hinged rod (92) is provided with a strip-shaped hole (921) along the length direction, a sliding block (922) is arranged in the strip-shaped hole (921) in a sliding mode, and the sliding block (922) is hinged to the free end of the piston rod (95); when cylinder (9) drive piston rod (95) when extending, piston rod (95) make articulated rod (92) round pin joint anticlockwise rotation through slider (922), make circular arc board (94) can press from both sides tightly on discharging pipe (33) pipe wall down.

5. The dust packing apparatus according to claim 1, 2 or 3, further comprising an air compressor (8), wherein an air inlet end and an air outlet end of the air compressor (8) are respectively connected with an air inlet pipe (81) and a blowback pipe (82), the air inlet pipe (81) is communicated with the outside, the blowback pipe (82) extends into the negative pressure cavity (21) and has a sealed end, a plurality of vent pipes (83) are arranged on the blowback pipe (82) in the negative pressure cavity (21) along the length direction, and the vent pipes (83) correspond to the bag-type dust collector (22).

6. A dust packing apparatus according to any one of claims 1 to 4, further comprising a weighing platform (4) and a controller (42), wherein the weighing platform (4) is located below the discharge pipe (3), a plurality of weighing sensors (41) are arranged at the bottom of the weighing platform (4), and the controller (42) is electrically connected with the weighing sensors (41) and the discharge valve (31) respectively through an external power supply.