阅读说明：本技术 一种磨煤机排放系统 (Coal pulverizer discharge system ) 是由 卫翔 任全在 祁永强 卫喆 白惠芬 杨兴宇 孙帅 于 2021-07-15 设计创作，主要内容包括：本发明公开了一种磨煤机排放系统,包括储料箱、输送机构、排料机构和控制装置；输送机构包括输送管和用于运输物料的输送机,输送机位于输送管内；储料箱通过连接管道与输送管连接,输送管与排料机构连接,连接管道上设置有调控闸门；控制装置包括用于检测物料的检测器和能够操作调控闸门开闭的控制器；检测器安装在储料箱内,检测器与控制器通信连接,控制器与调控闸门通信连接。该磨煤机排放系统能够自动排放物料,并将物料输送到排料机构,提高了自动化程度,减少了人力的使用。输送机位于输送管中,如此提高了密封性,减少粉尘的传播,改善了工作环境,保障了工作人员的身体健康。(The invention discloses a discharge system of a coal mill, which comprises a storage box, a conveying mechanism, a discharge mechanism and a control device, wherein the storage box is provided with a storage box inlet and a discharge outlet; the conveying mechanism comprises a conveying pipe and a conveyor for conveying materials, and the conveyor is positioned in the conveying pipe; the material storage box is connected with the conveying pipe through a connecting pipeline, the conveying pipe is connected with the discharging mechanism, and a regulating gate is arranged on the connecting pipeline; the control device comprises a detector for detecting materials and a controller capable of operating and regulating the opening and closing of the gate; the detector is installed in the storage case, detector and controller communication connection, controller and regulation and control gate communication connection. This coal pulverizer discharge system can discharge the material automatically to carry the material to arrange material mechanism, improved degree of automation, reduced the use of manpower. The conveyer is arranged in the conveying pipe, so that the sealing performance is improved, the dust transmission is reduced, the working environment is improved, and the physical health of workers is guaranteed.)

1. A discharge system (10) of a coal mill is characterized by comprising a storage box (1), a conveying mechanism (2), a discharging mechanism (3) and a control device (4);

the conveying mechanism (2) comprises a conveying pipe (21) and a conveyor (22) for conveying materials, and the conveyor (22) is positioned in the conveying pipe (21);

the storage box (1) is connected with the conveying pipe (21) through a connecting pipeline (11), the conveying pipe (21) is connected with the discharging mechanism (3), and a regulating gate (12) is arranged on the connecting pipeline (11);

the control device (4) comprises a detector (41) for detecting materials and a controller (42) capable of operating the regulation gate (12) to open and close;

the detector (41) is installed in the storage box (1), the detector (41) is in communication connection with the controller (42), and the controller (42) is in communication connection with the regulating gate (12).

2. The coal mill discharge system (10) of claim 1, characterized in that a first storage chamber (13) and a second storage chamber (14) are provided in the storage bin (1);

the second storage cavity (14) is positioned below the first storage cavity (13) and is communicated with the connecting pipeline (11), and the detector (41) is arranged in the first storage cavity (13);

a blocking gate (15) capable of being opened and closed is arranged between the first material storage cavity (13) and the second material storage cavity (14), and the blocking gate (15) is in communication connection with the controller (42).

3. The coal mill discharge system (10) of claim 2, characterized in that the storage bin (1) is provided with a viewing window (16), the viewing window (16) corresponding to the first storage chamber (13).

4. The coal mill discharge system (10) according to claim 2, characterized in that a discharge pipe (17) is provided on the storage tank (1), the discharge pipe (17) communicating with the second storage chamber (14), a discharge sluice (18) being provided on the discharge pipe (17).

5. The coal mill discharge system (10) of claim 1, characterized in that a camera (23) is disposed within the duct (21).

6. The coal mill discharge system (10) of claim 1, characterized in that the discharge mechanism (3) comprises a storage bin (31), a first discharge pipe (32), and a second discharge pipe (33);

the first discharging pipe (32) and the second discharging pipe (33) are arranged at the bottom of the storage bin (31) at intervals;

the first discharging pipe (32) is provided with a first discharging valve (34), and the second discharging pipe (33) is provided with a second discharging valve (35).

7. The coal mill discharge system (10) according to claim 6, characterized in that a dust catcher (5) is provided on the storage bin (31), the dust inlet of the dust catcher (5) communicating with the storage bin (31).

8. The coal mill discharge system (10) of claim 6, characterized in that a rapper (6) is provided on the storage bin (31), the vibrating end of the rapper (6) being in contact with the storage bin (31).

9. The coal mill discharge system (10) of claim 6, characterized in that the discharge mechanism (3) further comprises a wet mixer (7) and a dry ash bulk loader (8), the wet mixer (7) being connected to the first discharge pipe (32) and the dry ash bulk loader (8) being connected to the second discharge pipe (33).

10. The coal mill discharge system (10) of claim 6, characterized in that a feeder (9) is provided on the first discharge pipe (32) and on the second discharge pipe (33), respectively.

Technical Field

The invention relates to the field of power generation equipment, in particular to a coal mill discharge system.

Background

In recent years, medium-speed coal mills have low initial investment due to the adaptability of coal types. The advantages of low power consumption are applied to more and more active power plants. Pebble coal is an uncrushable byproduct discharged from a medium-speed coal mill during the operation process of the medium-speed coal mill, and mainly comes from coal gangue doped with coal, ore and coal which is difficult to grind. The discharge temperature of the pebble coal in operation is about 160 ℃, and the pebble coal quantity is closely related to the coal source, the operation working condition and the like. Therefore, whether the pebble coal can be discharged in time or not plays a crucial role in the normal operation of the coal mill.

At present, pebble coal is generally conveyed in a manual conveying mode, is directly discharged into a pebble coal hopper or a trolley through a gate, and is manually transferred to the outside of a plant for stacking. However, the transportation mode has low efficiency, needs a large amount of labor, generates a large amount of dust in the transportation process and affects the health of workers.

Based on the above technical problems, improvements thereof are required.

Disclosure of Invention

The technical scheme of the invention aims to provide the discharge system of the coal mill, which improves the working efficiency, reduces the working fatigue and protects the health of the body.

The technical scheme of the invention provides a discharge system of a coal mill, which comprises a storage box, a conveying mechanism, a discharge mechanism and a control device; the conveying mechanism comprises a conveying pipe and a conveyor for conveying materials, and the conveyor is positioned in the conveying pipe; the material storage box is connected with the conveying pipe through a connecting pipeline, the conveying pipe is connected with the discharging mechanism, and a regulating gate is arranged on the connecting pipeline; the control device comprises a detector for detecting materials and a controller capable of operating the regulation gate to open and close; the detector is installed in the storage box, the detector with controller communication connection, the controller with regulation and control gate communication connection.

Furthermore, a first material storage cavity and a second material storage cavity are arranged in the material storage box; the second material storage cavity is positioned below the first material storage cavity and communicated with the connecting pipeline, and the detector is arranged in the first material storage cavity; the first storage cavity with be provided with between the second storage cavity and can open and close separate the fender gate, separate the fender gate with controller communication connection.

Further, the storage box is provided with an observation window, and the observation window corresponds to the first storage cavity.

Further, a discharging pipe is arranged on the material storage box and communicated with the second material storage cavity, and a discharging gate is arranged on the discharging pipe.

Furthermore, a camera is arranged in the conveying pipe.

Further, the discharging mechanism comprises a storage bin, a first discharging pipe and a second discharging pipe; the first discharging pipe and the second discharging pipe are arranged at the bottom of the storage bin at intervals; and a first discharge valve is arranged on the first discharge pipe, and a second discharge valve is arranged on the second discharge pipe.

Furthermore, a dust remover is arranged on the storage bin, and a dust inlet of the dust remover is communicated with the storage bin.

Furthermore, a vibrator is arranged on the storage bin, and a vibration end of the vibrator is in contact with the storage bin.

Further, arrange material mechanism still includes humidification mixer and dry ash bulk machine, humidification mixer with first row material union coupling, dry ash bulk machine with the second row material union coupling.

Further, a feeder is respectively arranged on the first discharging pipe and the second discharging pipe.

By adopting the technical scheme, the method has the following beneficial effects:

the technical scheme of the invention provides a discharge system of a coal mill, which comprises a storage box, a conveying mechanism, a discharging mechanism and a control device. The conveying mechanism comprises a conveying pipe and a conveyor for conveying materials, and the conveyor is located in the conveying pipe. The material storage box is connected with the conveying pipe through a connecting pipeline, the conveying pipe is connected with the discharging mechanism, and a regulating gate is arranged on the connecting pipeline. The control device comprises a detector for detecting materials and a controller capable of operating and regulating the opening and closing of the gate. The detector is installed in the storage case, detector and controller communication connection, controller and regulation and control gate communication connection. This coal pulverizer discharge system can discharge the material automatically to carry the material to arrange material mechanism, improved degree of automation, reduced the use of manpower. The conveyer is arranged in the conveying pipe, so that the sealing performance is improved, the dust transmission is reduced, the working environment is improved, and the physical health of workers is guaranteed.

Drawings

FIG. 1 is a schematic illustration of a coal mill discharge system in accordance with an embodiment of the present invention.

Fig. 2 is a schematic diagram of a control device according to an embodiment of the invention.

FIG. 3 is a schematic view of a storage bin and a transport mechanism according to an embodiment of the invention.

Fig. 4 is a schematic diagram of a conveying mechanism according to an embodiment of the invention.

FIG. 5 is a schematic view of a discharge mechanism according to an embodiment of the present invention.

Detailed Description

The following further describes embodiments of the present invention with reference to the accompanying drawings.

It is easily understood that according to the technical solution of the present invention, those skilled in the art can substitute various structures and implementation manners without changing the spirit of the present invention. Therefore, the following detailed description and the accompanying drawings are merely illustrative of the technical aspects of the present invention, and should not be construed as limiting or restricting the technical aspects of the present invention.

The terms of orientation of up, down, left, right, front, back, top, bottom, and the like referred to or may be referred to in this specification are defined relative to the configuration shown in the drawings, and are relative terms, and thus may be changed correspondingly according to the position and the use state of the device. Therefore, these and other directional terms should not be construed as limiting terms.

As shown in fig. 1 to 5, a discharge system 10 of a coal mill according to an embodiment of the present invention includes a storage bin 1, a conveying mechanism 2, a discharging mechanism 3, and a control device 4.

The conveying mechanism 2 comprises a conveying pipe 21 and a conveyor 22 for conveying material, the conveyor 22 being located inside the conveying pipe 21.

The storage box 1 is connected with the delivery pipe 21 through the connecting pipeline 11, the delivery pipe 21 is connected with the discharging mechanism 3, and the connecting pipeline 11 is provided with a regulating gate 12.

The control device 4 includes a detector 41 for detecting the material and a controller 42 capable of operating to regulate the opening and closing of the shutter 12.

The detector 41 is arranged in the storage box 1, the detector 41 is in communication connection with the controller 42, and the controller 42 is in communication connection with the control gate 12.

The coal mill discharge system 10 is used to discharge material produced by a coal mill, such as pebble coal, coal slag, and the like. For convenience of description, the material is illustrated as pebble coal.

The coal mill discharge system 10 includes a storage bin 1, a conveying mechanism 2, a discharge mechanism 3, and a control device 4. The storage box 1 is used for storing pebble coal discharged by the coal mill, and the pebble coal is cooled in the storage box 1. The coal mill is connected with the storage box 1.

Conveying mechanism 2 includes conveyer pipe 21 and conveyer 22, and conveyer pipe 21 is hollow pipeline, is connected with connecting tube 11 between conveyer pipe 21 and storage case 1, and connecting tube 11's one end and storage case 1 intercommunication, the other end and conveyer pipe 21 intercommunication. And a delivery pipe 21 is connected between the connecting pipe 11 and the discharge mechanism 3. Thus forming a closed conveying space. The conveyor 22 is installed in the conveying pipe 21, and the pebble coal in the storage tank 1 falls onto the conveyor 22 after entering the conveying pipe 21 through the connecting pipe 11, and then is conveyed from the head end of the conveyor 22 to the tail end of the conveyor 22. The dust generated in the transportation process is blocked by the conveying pipe 21 and drifts in the air, so that the air quality of the working environment is improved, and the physical health of workers is guaranteed.

Alternatively, the conveyor 22 is an automatic chainbelt slag extractor having a driving roller, a driven roller, a conveyor belt, and a drive motor. The driving motor is connected with the driving roller and the driven roller through the driving chain, one end of the conveying belt is sleeved on the driving roller, and the other end of the conveying belt is sleeved on the driven roller. When the pebble coal falls on the conveyor belt, the pebble coal is conveyed by the conveyor belt and moves from the driving roller to the driven roller. Of course, the conveyor 22 may have other structures as long as it can move the material in the conveying pipe 21.

Optionally, a cleaning mechanism is arranged on the automatic chain slag extractor, and the cleaning mechanism comprises an output motor, a cleaning brush and a rack. The output motor is arranged on the automatic chain slag extractor, and the rack is connected to the automatic chain slag extractor in a sliding way and is positioned below the conveying belt. The cleaning brush is connected on the rack and can be contacted with the conveying belt, and the rack is meshed with the gear of the output motor. When the conveying belt needs to be cleaned, the output motor is turned on, and drives the rack to move in a reciprocating manner, so that the cleaning brush can clean the surface of the conveying belt back and forth.

A regulating gate 12 is arranged on the connecting pipeline 11, and the regulating gate 12 is pivoted in the connecting pipeline 11. The control gate 12 can be opened and closed, and when the control gate 12 is in a closed state, the control gate 12 blocks the connecting pipeline 11, so that the pebble coal in the storage tank 1 cannot enter the conveying pipe 21. When the regulating gate 12 is in an open state, the connecting pipeline 11 is unblocked, and pebble coal can enter the conveying pipe 21.

Optionally, the mill discharge system 10 includes a plurality of storage bins 1, and a connecting pipe 11 is connected between each storage bin 1 and the duct 21.

The control device 4 is connected to the control gate 12 in a communication manner, i.e. the control device 4 can transmit information to the control gate 12 to control the opening and closing of the control gate 12. The control device 4 comprises a controller 42 and a detector 41, wherein the detector 41 is mounted in the storage bin 1 and is capable of detecting the condition of pebble coal in the storage bin 1. When the pebble coal in the storage box 1 is detected to meet the discharge standard, the detector 41 transmits information to the controller 42, and then the controller 42 controls the regulating gate 12 to be opened to discharge the pebble coal. After the pebble coal is discharged, the controller 42 controls the regulating gate 12 to be closed. Thus, pebble coal can be automatically discharged, the automation degree is improved, the pebble coal can be intermittently discharged, and the conveying pressure of the conveyor 22 is reduced.

The communication connection includes a wired connection and a wireless connection, wherein the wired connection may be a wired connection, and the wireless connection may be a WiFi or infrared connection. As long as the mutual information transmission between the two can be realized.

Optionally, the detector 41 is a temperature sensor, and when the temperature of the pebble coal in the storage tank 1 is detected to be at a normal temperature, the regulating valve can be opened. Or the detector 41 is a weight sensor, and when the weight of the pebble coal in the storage tank 1 is detected to reach the standard, the regulating valve is opened. The detector 41 may also be a hopper acoustic level gauge capable of measuring the level of pebble coal in the storage bin 1.

Optionally, the regulator gate 12 is a solenoid valve.

The discharging mechanism 3 is connected with a conveying pipe 21, and the pebble coal enters the discharging mechanism 3 after being conveyed by a conveyor 22 to wait for discharging. Optionally, the discharging mechanism 3 is a discharging box or a discharging bin, and the pebble coal can be stored after entering the discharging mechanism 3.

In one embodiment, as shown in fig. 1-3, a first storage chamber 13 and a second storage chamber 14 are provided in the storage tank 1. The second material storage cavity 14 is positioned below the first material storage cavity 13 and is communicated with the connecting pipeline 11, and the detector 41 is arranged in the first material storage cavity 13. A blocking gate 15 capable of being opened and closed is arranged between the first material storage cavity 13 and the second material storage cavity 14, and the blocking gate 15 is in communication connection with the controller 42.

Specifically, a blocking gate 15 is arranged in the material storage tank 1 to divide the material storage tank 1 into a first material storage chamber 13 and a second material storage chamber 14. The separation gate 15 is pivoted in the material storage box 1, the separation gate 15 can be opened and closed, and when the separation gate 15 is opened, the first material storage cavity 13 is communicated with the second material storage cavity 14. When the blocking gate 15 is closed, the first storage cavity 13 and the second storage cavity 14 are blocked. The controller 42 is communicatively connected to the damper door 15 to control the opening and closing of the damper door 15. The pebble coal discharged from the coal mill enters the first storage cavity 13 to wait for cooling, and then when the pebble coal needs to be discharged, the controller 42 controls the blocking gate 15 to be opened, so that the pebble coal enters the second storage cavity 14, and then the controller 42 controls and controls the gate to be opened, so that the pebble coal enters the conveyor 22 to be conveyed. So set up, be favorable to the pebble coal to discharge step by step, reduce and pile up too much needs refrigerated pebble coal in storage case 1, improve the security.

In one embodiment, as shown in fig. 1, the storage bin 1 is provided with an observation window 16, and the observation window 16 corresponds to the first storage chamber 13.

Specifically, a mounting hole is formed in the material storage box 1, and the mounting hole is communicated with the first material storage cavity 13. An observation window 16 is embedded in the mounting hole, so that workers can observe the conditions in the first material storage cavity 13 conveniently.

In one embodiment, as shown in fig. 1 and 3, the storage tank 1 is provided with an outlet pipe 17, the outlet pipe 17 is communicated with the second storage chamber 14, and the outlet pipe 17 is provided with an outlet lock 18.

Specifically, a discharge pipe 17 is connected to the material storage tank 1, and the discharge pipe 17 is disposed opposite to the connection pipe 11. The storage tank 1, the discharge pipe 17 and the connecting pipeline 11 are connected in a herringbone manner. The storage pipe is provided with a discharge gate 18 which can be opened and closed, when the discharge gate 18 is opened, the discharge pipe 17 is communicated, and pebble coal can be discharged through the discharge pipe 17. When the outlet sluice 18 is closed, the outlet pipe 17 is blocked. Normally, the discharge gate 18 is in a closed state, and the pebble coal is discharged from the connecting duct 11. When a special condition occurs, the discharge gate 18 can be opened to discharge the pebble coal from the discharge pipe 17, so as to avoid damage to the storage tank 1. For example, when the damper door 12 is damaged and cannot be opened, the discharge door 18 needs to be opened to discharge the pebble coal urgently in order to reduce the quantity of the pebble coal in the second storage chamber 14.

In one embodiment, as shown in fig. 1 and 4, a camera 23 is disposed within delivery tube 21.

Specifically, the delivery pipe 21 includes a first pipe and a second pipe connected to the first pipe, and the first pipe and the second pipe are connected at a certain angle. The camera 23 is disposed at a junction of the first pipe and the second pipe. Camera 23 is connected with the external display screen, and the condition in conveyer pipe 21 can be observed through camera 23 to the staff, facilitates the use.

Alternatively, the camera 23 can be rotated 360 degrees, so that the inside of the conveying pipe 21 can be viewed in all directions.

In one embodiment, as shown in fig. 1 and 5, the discharge mechanism 3 includes a storage bin 31, a first discharge pipe 32, and a second discharge pipe 33. A first discharge pipe 32 and a second discharge pipe 33 are provided at intervals at the bottom of the storage bin 31. A first discharge valve 34 is arranged on the first discharge pipe 32, and a second discharge valve 35 is arranged on the second discharge pipe 33.

Specifically, the discharge mechanism 3 is composed of a storage bin 31, a first discharge pipe 32, a second discharge pipe 33, a first discharge valve 34, and a second discharge valve 35. The storage bin 31 is communicated with the conveying pipe 21, a first discharging pipe 32 and a second discharging pipe 33 are arranged at the bottom of the storage bin 31 at intervals, a first discharging valve 34 is pivoted in the first discharging pipe 32, and a second discharging valve 35 is pivoted in the second discharging pipe 33. When the first discharge valve 34 is open, the first discharge pipe 32 is clear, and when the first discharge valve 34 is closed, the first discharge pipe 32 is blocked. When the second discharge valve 35 is open, the second discharge pipe 33 is open, and when the second discharge valve 35 is closed, the second discharge pipe 33 is blocked. The discharging mechanism 3 is simple in structure and not easy to damage. And the staff can select to discharge from the first discharge pipe 32 or the second discharge pipe 33 or simultaneously discharge from the first discharge pipe 32 and the second discharge pipe 33 according to actual requirements.

The first and second discharge valves 34, 35 may be manual or electric valves. When the first discharge valve 34 and the second discharge valve 35 are electrically operated valves, the first discharge valve 34 and the second discharge valve 35 are respectively connected with the controller 42 or the unit DCS control system, and interlock logic is set to ensure intermittent operation of the discharge system.

Alternatively, the storage bin 31 is funnel-shaped, so that the pebble coal can be guided to flow downward.

In one embodiment, as shown in fig. 1 and 5, a dust collector 5 is disposed on the storage bin 31, and a dust inlet of the dust collector 5 is communicated with the storage bin 31. Dust is inevitably generated when the pebble coal enters the storage bin 31 from the conveying pipe 21. At this time, the dust collector 5 can suck the dust and reduce the dust in the storage bin 31.

Optionally, the dust collector 5 is a pulse bag type dust collector, and has the characteristics of large air handling capacity, small occupied area, high purification efficiency, reliable work, simple structure, small maintenance amount and the like. Of course, the dust remover 5 can also be in other dust removing structures.

Optionally, the pulse bag type dust collector is connected with a compressed air main pipe of a power plant, so that the storage bin 31 is fully closed, and meanwhile, the pulse bag type dust collector can be periodically and reversely blown.

In one embodiment, as shown in fig. 1 and 5, the storage bin 31 is provided with a rapper 6, the vibrating end of the rapper 6 being in contact with the storage bin 31.

Specifically, a vibrator 6 is provided on the wall of the storage bin 31, and the vibrator 6 is located outside the storage bin 31 and can drive the storage bin 31 to shake or continuously and repeatedly knock the storage bin 31, so that the pebble coal adhered to the inner wall of the storage bin 31 can be shaken off.

Optionally, the rapper 6 is a vibrating motor.

In one embodiment, as shown in fig. 1 and 5, the discharging mechanism 3 further includes a humidifying blender 7 and a dry ash bulk machine 8, the humidifying blender 7 is connected with the first discharging pipe 32, and the dry ash bulk machine 8 is connected with the second discharging pipe 33.

Specifically, the dry ash bulk machine 8 can transport the pebble coal to a designated area, and the humidifying agitator 7 can humidify the pebble coal. So set up, the staff can select how to handle the pebble coal according to the circumstances.

The dry ash bulk machine 8 mainly comprises a manual rod valve, an electric fan valve, a winding device, a telescopic unloading device, a dust collection hose, a capacitance limit switch, an electric control system and the like.

The humidifying stirrer 7 is fed uniformly by two sets of helical blades into the main machine, and the dry ash powdery materials fed into the mixing tank and the stirring tank are forcibly mixed and stirred by water quantitatively supplied by the water supply device, and meanwhile, the materials meeting the humidity requirement are conveyed to the discharge port to be discharged.

Alternatively, the pebble coal discharged by the dry ash bulk machine 8 is loaded and transported by a transport vehicle, and the pebble coal discharged by driving the mixer 7 is directly transported to the next processing equipment for use.

In one embodiment, as shown in fig. 1 and 5, the feeders 9 are respectively disposed on the first discharge pipe 32 and the second discharge pipe 33.

Specifically, one feeder 9 is provided in each of the first discharge pipe 32 and the second discharge pipe 33, and when the first discharge valve 34 or the second discharge valve 35 is opened, the pebble coal falls onto the feeder 9 and is discharged to the dry ash bulk machine 8 or the wet mixer 7 through the feeder 9. The feeder 9 ensures smooth discharge of the pebble coal and improves the discharge speed of the pebble coal.

Alternatively, the feeder 9 is an electric feeder, and may be a material transfer pump.

In summary, the invention discloses a discharge system of a coal mill, which comprises a storage box, a conveying mechanism, a discharging mechanism and a control device. The conveying mechanism comprises a conveying pipe and a conveyor for conveying materials, and the conveyor is located in the conveying pipe. The material storage box is connected with the conveying pipe through a connecting pipeline, the conveying pipe is connected with the discharging mechanism, and a regulating gate is arranged on the connecting pipeline. The control device comprises a detector for detecting materials and a controller capable of operating and regulating the opening and closing of the gate. The detector is installed in the storage case, detector and controller communication connection, controller and regulation and control gate communication connection. This coal pulverizer discharge system has improved degree of automation through controlling means and conveying mechanism's setting, makes it can discharge automatically and transport the material, has reduced staff's work fatigue. In the process of transporting materials, the materials are located in the closed space of the conveying pipe, and the conveying pipe prevents dust from floating, so that the quality of the working environment is improved, and the human health is guaranteed.

According to the needs, the above technical schemes can be combined to achieve the best technical effect.

The foregoing is considered as illustrative only of the principles and preferred embodiments of the invention. It should be noted that, for those skilled in the art, several other modifications can be made on the basis of the principle of the present invention, and the protection scope of the present invention should be regarded.