Pneumatic conveying device for solid materials

Abstract

The utility model discloses a pneumatic solid material conveying device, which belongs to the field of material conveying and comprises a stock bin, a feed opening is arranged at the bottom of the stock bin, an air closing machine is arranged at the bottom end of the feed opening, the bottom end of the air closing machine is communicated with a material blowing pipe, one end of the material blowing pipe is used for being connected with a boiler, and the other end of the material blowing pipe is used for being connected with a material blowing fan. The air seal machine is arranged at the discharging opening in the bottom of the stock bin for discharging, smooth, even and continuous discharging is guaranteed, meanwhile, air pressure separation of the upper portion and the lower portion of the air seal machine is achieved, and raised dust caused by air return is prevented. Meanwhile, the equipment is simple in structure, small in occupied area, convenient to operate and high in practicability, and a good effect is achieved in actual engineering use.

Description

Technical Field

[0001] The utility model relates to the field of material conveying, in particular to a pneumatic conveying device for solid materials. Background Art

[0002] In the actual production and living process, such as in the dry denitration technology, solid conveying problems are often encountered. The solids include powders, granules, etc. The common conveying methods mainly include mechanical conveying and pneumatic conveying. When the conveying gas passes through the feeding area, due to the relatively high air pressure at the outlet of the fan, a positive pressure blockage will be formed at the position of the blanking port, resulting in poor blanking and affecting the blanking effect; when there is less material in the silo, reverse air flow will occur, which not only causes poor feeding but also causes dust in the silo, affecting the working environment. Summary of the Utility Model

[0003] To solve the problems of the prior art, the utility model provides a pneumatic conveying device for solid materials, which ensures smooth, uniform and continuous blanking and prevents dust caused by reverse air flow.

[0004] The technical solution provided by the utility model is as follows:

[0005] A pneumatic conveying device for solid materials includes a silo. A blanking port is provided at the bottom of the silo. A rotary air lock is provided at the bottom end of the blanking port. The bottom end of the rotary air lock is communicated with a blowing pipe. One end of the blowing pipe is used to connect with a boiler, and the other end is used to connect with a blowing fan.

[0006] Further, the bottom end of the rotary air lock is communicated with the blowing pipe through a negative pressure acceleration chamber, and the cross-sectional area of the lower part of the negative pressure acceleration chamber is smaller than that of the upper part.

[0007] Further, a negative pressure air supplement port is provided on the side wall of the negative pressure acceleration chamber, and the included angle between the air inlet direction of the negative pressure air supplement port and the air flow direction of the negative pressure acceleration chamber is less than 90°.

[0008] Further, the negative pressure air supplement port is connected with a dust suction pipe.

[0009] Further, a heater, a heat preservation layer and a first temperature sensor are provided on the silo.

[0010] Further, a vibrator is provided on the outer wall of the silo, and the vibrator is arranged on a support located on the outer wall of the silo.

[0011] Further, a level switch is provided on the silo.

[0012] Further, the material blowing fan is a high-pressure variable-frequency vortex fan. A first pressure transmitter is arranged at the air outlet of the high-pressure variable-frequency vortex fan. A second temperature sensor is arranged on the outer shell of the high-pressure variable-frequency vortex fan. A second pressure transmitter is arranged at the negative-pressure air supplement port.

[0013] Further, the material blowing fan, the first pressure transmitter, the second pressure transmitter, the first temperature sensor, the second temperature sensor, the air lock, the heater, the vibrator and the level switch are connected to a PLC controller. The PLC controller is connected to a remote device through a 4G network.

[0014] Further, the solid material pneumatic conveying device is arranged in a box body. The box body includes a base, a bracket and a housing. The material blowing fan is arranged on the base. The material bin and the air lock are arranged on the bracket. The box body has an openable feeding cover plate at the top of the material bin. A handle is arranged on the feeding cover plate.

[0015] The utility model has the following beneficial effects:

[0016] In the utility model, an air lock is arranged at the blanking port at the bottom of the material bin for blanking, which ensures smooth, uniform and continuous blanking. At the same time, the air pressure between the upper and lower parts of the air lock is cut off, preventing dust from being raised due to backdraft. Meanwhile, the equipment has a simple structure, a small floor area, is convenient to operate and has strong practicability, and has achieved good results in actual engineering applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is the front view of the solid material pneumatic conveying device of the utility model;

[0018] Figure 2 is the top view of the solid material pneumatic conveying device of the utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] In order to make the technical problems, technical solutions and advantages to be solved by the utility model clearer, the following will be described in detail with reference to the accompanying drawings and specific embodiments.

[0020] An embodiment of the utility model provides a solid material pneumatic conveying device, as Figure 1-2 shown, which includes a material bin 1. A blanking port 2 is arranged at the bottom of the material bin 1. An air lock 3 is arranged at the bottom end of the blanking port 2. The bottom end of the air lock 3 is communicated with a blowing pipe 4. One end of the blowing pipe 4 is used to be connected to a boiler, and the other end is used to be connected to a material blowing fan 5, for example, connected to the material blowing fan 5 through a connecting pipe 22.

[0021] The rotary feeder is usually used in the pneumatic output system. For the pressure output system or the negative pressure output system, the rotary feeder can supply materials to the conveying pipe evenly and continuously, so as to ensure that the gas-solid ratio in the pneumatic output pipe is relatively stable, enabling the pneumatic conveying to work properly. At the same time, the rotary feeder can also cut off the air pressure between its upper and lower parts to play a role in air locking.

[0022] In the utility model, a rotary feeder is arranged at the blanking port at the bottom of the silo for blanking, ensuring smooth, even and continuous blanking. At the same time, the air pressure between the upper and lower parts of the rotary feeder is cut off, preventing dust from being raised due to backwind. At the same time, the equipment has a simple structure, a small floor area, is easy to operate, and has strong practicability, achieving good results in actual engineering applications.

[0023] As an improvement of the utility model, the bottom end of the rotary feeder 3 is connected to the blowing pipe 4 through a negative pressure acceleration chamber 6. The negative pressure acceleration chamber 6 is of a barrel-shaped structure, and its lower cross-section is smaller than the upper cross-section, such as an inverted frustum-shaped structure or a prismatic frustum-shaped structure, etc. According to Bernoulli's principle, the greater the flow velocity, the smaller the pressure. Because the lower cross-section of the negative pressure acceleration chamber 6 is smaller than the upper cross-section, the air flow velocity is greater in the lower part and smaller in the upper part, and the air pressure in the lower part is less than that in the upper part, forming a negative pressure state from top to bottom.

[0024] When conveying materials, the materials in the upper silo, after being fed through the rotary feeder 3, fall into the feeding port of the negative pressure acceleration chamber 6. Under the action of negative pressure, they automatically enter the blowing pipe 4 downward. The entire blanking area is in a negative pressure state, and the materials are automatically sucked by negative pressure to ensure smooth blanking and prevent blockage.

[0025] A negative pressure air supplement port 7 is arranged on the side wall of the negative pressure acceleration chamber 6. The negative pressure air supplement port 7 provides more external gas for the blowing pipe to ensure the gas conveying flow rate. The included angle between the air inlet direction of the negative pressure air supplement port 7 and the air flow direction of the negative pressure acceleration chamber 6 is less than 90°, which is convenient for smooth air supplement.

[0026] At the same time, the negative pressure air supplement port 7 can also be connected to a dust suction pipe, and the dust suction pipe can also be connected to various enlarged suction devices, which are placed near the silo 1 to suck dust from the nearby area and purify and improve the surrounding working environment.

[0027] Some materials will have problems such as damp condensation and caking inside the silo, resulting in unsmooth blanking. To solve this problem, a heater 8, a heat preservation layer and a first temperature sensor 9 are arranged on the silo 1 in the utility model. The silo 1 can be ensured to be within the set range. By setting the upper and lower temperature limits, the start and stop of the heater 8 are automatically controlled. When the temperature reaches the set upper limit, the heater 8 is turned off; when the temperature is lower than the set lower limit, the heater 8 is turned on.

[0028] Furthermore, a vibrator 10 is provided on the outer wall of the silo 1, and the vibrator 10 is arranged on a support 11 located on the outer wall of the silo 1. Through the vibration of the vibrator 10, it is possible to prevent materials from sticking to the inner wall of the silo.

[0029] The silo 1 is provided with a level switch 12. The material quantity in the silo is detected by the level switch. When it is lower than the set quantity, an alarm is given to prompt feeding or the external feeding device is controlled to automatically feed.

[0030] In pneumatic conveying, generally compressed air, a high-pressure centrifugal fan or a Roots blower is used to supply air as the conveying fluid. The power consumption of such conveying equipment is generally high, resulting in an increase in the operating cost of the system. To solve this problem, the blowing fan 5 of the present utility model adopts a high-pressure variable-frequency vortex fan. By providing air source through the high-efficiency and low-energy-consumption high-pressure vortex fan, it has the effect of energy saving, and at the same time can ensure the effect of pneumatic conveying. It is 80% more energy-saving than the commonly used Roots blower. At the same time, the equipment has a smaller volume, occupies less floor area, is lighter in weight, and saves more materials.

[0031] A first pressure transmitter 13 is arranged at the air outlet of the high-pressure variable-frequency vortex fan, and a second temperature sensor 14 is arranged on the outer shell of the high-pressure variable-frequency vortex fan to monitor the operating state of the high-pressure variable-frequency vortex fan at all times. When abnormal conditions such as low pressure and over-temperature occur, audible and visual alarms can be given to ensure the normal operation of the whole set of equipment.

[0032] Similarly, a second pressure transmitter 15 is arranged on the negative-pressure air supply port 7 to monitor the air intake state of the negative-pressure air supply port 7.

[0033] Generally, after the equipment is installed, only through methods such as telephone communication or people going to the site can after-sales service be carried out. It is impossible to observe the operating state of the equipment at any time, impossible to discover problems existing in the operation process of the equipment in advance, impossible to provide better services for users, and only receive feedback from users when problems occur, which often affects the use of users.

[0034] To solve the above problems, the control of various components of the present utility model (such as the blowing fan, the first pressure transmitter, the second pressure transmitter, the first temperature sensor, the second temperature sensor, the air lock, the heater, the vibrator and the level switch, etc.) adopts a PLC control system. Through the feedback of system parameters, the operating state of the equipment is monitored; the automatic control operation of the equipment can be realized through the data detected by the interlock online. The control system is connected to remote devices by using 4G Internet of Things technology, and remote monitoring and operation of the system can be realized, which is convenient for subsequent technical support and after-sales service.

[0035] For the convenience of installation, the solid material pneumatic conveying device is arranged in a box body 16. The box body 16 includes a base 17, a bracket 18 and a housing 19. The blowing fan 5 is arranged on the base 17, and the silo 1 and the air lock 3 are arranged on the bracket 18.

[0036] The box body 16 has an openable and closable feeding cover plate 20 at the top of the bin 1, and a handle 21 is arranged on the feeding cover plate 20 to facilitate feeding.

[0037] An electric control system cabinet 23 can also be arranged inside the box body 16 for setting the electric control system of the equipment.

[0038] The above is the preferred embodiment of the present utility model. It should be pointed out that for those of ordinary skill in the art in this technical field, without departing from the principle described in the present utility model, several improvements and modifications can still be made, and these improvements and modifications should also be regarded as the protection scope of the present utility model.

Claims

1. A solid material pneumatic conveying device, characterized in that: It includes a silo, a discharge port is arranged at the bottom of the silo, a fan is arranged at the bottom of the discharge port, the bottom of the fan is connected with a blowing pipe, one end of the blowing pipe is used to connect with the boiler, and the other end is used to connect with the blowing fan.

2. The solid material pneumatic conveying device according to claim 1, characterized in that: The bottom end of the air shut-off fan is connected to the blowing pipe through a negative pressure acceleration chamber, and the lower cross section of the negative pressure acceleration chamber is smaller than the upper cross section.

3. The solid material pneumatic conveying device according to claim 2, characterized in that: A negative pressure air replenishment port is arranged on the side wall of the negative pressure acceleration chamber, and the angle between the air inlet direction of the negative pressure air replenishment port and the air flow direction of the negative pressure acceleration chamber is less than 90°.

4. The solid material pneumatic conveying device according to claim 3, characterized in that: The negative pressure air supply port is connected with a dust suction pipeline.

5. The solid material pneumatic conveying device according to claim 3, characterized in that: The silo is provided with a heater, a heat-insulating layer and a first temperature sensor.

6. The solid material pneumatic conveying device according to claim 5, characterized in that: A rapper is arranged on the outer wall of the silo, and the rapper is arranged on a support located on the outer wall of the silo.

7. The solid material pneumatic conveying device according to claim 6, characterized in that: The material bin is provided with a material level switch.

8. The solid material pneumatic conveying device according to claim 7, characterized in that: The blowing fan is a high-pressure variable-frequency vortex fan, the air outlet of which is provided with a first pressure transmitter, the casing of which is provided with a second temperature sensor, and the negative pressure air supply port is provided with a second pressure transmitter.

9. The solid material pneumatic conveying device according to claim 8, characterized in that: The blowing fan, the first pressure transmitter, the second pressure transmitter, the first temperature sensor, the second temperature sensor, the fan off fan, the heater, the vibrator and the material level switch are connected to the PLC controller, and the PLC controller is connected to the remote device through the network.

10. The solid material pneumatic conveying device according to any one of claims 1 to 9, characterized in that: The solid material pneumatic conveying device is arranged in a box body, and the box body includes a base, a bracket and an outer shell. The blowing fan is arranged on the base, and the silo and the air shut-off fan are arranged on the bracket; the box body has an openable and closable feeding cover on the top of the silo, and a handle is arranged on the feeding cover.

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