Solid material feeding device

Abstract

The utility model discloses a solid material feeding device, which belongs to the field of material conveying and comprises a feeding hopper and a storage bin, a negative-pressure discharging acceleration device is arranged below a discharging port at the bottom of the feeding hopper, and an outlet of the negative-pressure discharging acceleration device is connected with a feeding port of the storage bin through a material conveying pipeline. A discharging device is arranged at a discharging opening in the bottom of the storage bin. The negative-pressure discharging accelerating device comprises an air inlet pipeline and a discharging pipeline, the bottom of the discharging port is communicated with the top of the discharging pipeline, the front end of the discharging pipeline is closed, and the rear end of the discharging pipeline is connected with the material conveying pipeline; the front end of the air inlet pipeline is connected with the conveying fan, the diameter of the rear end of the air inlet pipeline is reduced to form a necking section which extends into the discharging pipeline, the necking section is located below the discharging port, and the diameter of the necking section is smaller than that of the discharging pipeline. According to the utility model, solid materials can be smoothly discharged and can be better mixed with conveyed gas; meanwhile, a negative pressure temporary storage chamber does not need to be independently arranged, the equipment structure is simplified, the sealing requirement is lowered, and the structure is simple.

Description

Technical Field

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

[0002] In the actual production and living process, such as in the dry denitration technology, the problem of transporting dry materials from a low point to a high point often occurs. The common transportation methods mainly include mechanical transportation and pneumatic transportation. For non-extrudable materials, mechanical transportation is likely to cause material extrusion and crushing, and at the same time, affected by the on-site location, there are many inconveniences during use. Pneumatic transportation has methods such as positive pressure transportation and negative pressure transportation, each with its own advantages and disadvantages. Traditional pneumatic positive pressure transportation has problems such as poor material discharging and reverse air dusting at the feeding position. The traditional pneumatic negative pressure transportation system has higher requirements for the tightness of the system. When sucking materials to a high position, if there is a leakage position, it will affect the transportation effect. Moreover, the traditional pneumatic negative pressure transportation system generally needs to additionally set up a negative pressure temporary storage chamber (such as the feeding bin 26 in the Chinese patent document CN217092897U, the high-position bin 1 in the Chinese patent document CN216367391U), which increases the complexity of the equipment structure. Summary of the Utility Model

[0003] To solve the problems of the prior art, the utility model provides a feeding device for solid materials, which enables the solid materials to fall smoothly and can be better mixed with the conveying gas; at the same time, it does not require a separate negative pressure temporary storage chamber, simplifies the equipment structure, reduces the sealing requirements, has a simple structure, reduces the processing and manufacturing difficulty, reduces the cost, and has strong practicability.

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

[0005] A feeding device for solid materials includes a feeding hopper and a storage bin. An outlet is arranged at the bottom of the feeding hopper. A negative pressure feeding acceleration device is arranged below the outlet. The outlet of the negative pressure feeding acceleration device is connected to the inlet of the storage bin through a material conveying pipeline. A discharge port is arranged at the bottom of the storage bin, and a discharger is arranged at the discharge port;

[0006] The negative pressure feeding acceleration device includes an air inlet pipeline and a discharge pipeline. The discharge pipeline is arranged below the outlet, and the bottom of the outlet is communicated with the top of the discharge pipeline; the front end of the discharge pipeline is closed, and the outlet at the rear end is connected to the material conveying pipeline;

[0007] The front end of the air inlet pipeline is connected to a conveying fan, and the diameter of the air outlet at the rear end is reduced to form a reduced section. The reduced section extends into the discharge pipeline from the front end of the discharge pipeline, and the reduced section is located below the outlet, and the diameter of the reduced section is smaller than the diameter of the discharge pipeline.

[0008] Further, the outlet end face of the necking section does not exceed the rearmost end of the discharge port, and the diameter of the necking section is less than one-third of the diameter of the discharge pipeline.

[0009] Further, a tapered transition section is provided between the necking section and the non-reduced-diameter air inlet pipeline, and a housing having the same diameter as the non-reduced-diameter air inlet pipeline is provided on the part of the tapered transition section and the necking section located outside the discharge pipeline.

[0010] Further, a negative-pressure air supplement port is provided on the side wall of the feeding hopper, and the included angle between the air inlet direction of the negative-pressure air supplement port and the material falling direction of the feeding hopper is less than 90°.

[0011] Further, a slide gate valve is provided on the feeding hopper, the slide gate valve is obliquely arranged above the negative-pressure air supplement port, and a screen is provided at the top end of the feeding hopper.

[0012] Further, a high-level material level meter and a low-level material level meter are respectively provided on the upper part and the lower part of the storage bin.

[0013] Further, a constant-pressure dust collector is provided on the top of the storage bin.

[0014] Further, a heater and a heat preservation layer are provided on the storage bin.

[0015] Further, an inspection port is provided on the top of the storage bin, and the storage bin is arranged on a bracket.

[0016] Further, the blowing fan is a high-pressure variable-frequency vortex fan, a pressure transmitter is provided at the air outlet of the high-pressure variable-frequency vortex fan, and a temperature sensor is provided on the housing of the high-pressure variable-frequency vortex fan.

[0017] The utility model has the following beneficial effects:

[0018] The utility model sucks materials into the negative-pressure feeding acceleration device through negative pressure and conveys them to the storage bin through positive pressure, solving the problems of unsmooth material falling and air return and dust raising caused by positive-pressure plugging at the discharge port in the prior art, enabling the solid materials to fall smoothly and being able to mix better with the conveying gas. In addition, there is no need to separately set up a negative-pressure temporary storage chamber, which simplifies the equipment structure, reduces the sealing requirement at the same time, has a simple structure, reduces the processing and manufacturing difficulty, reduces the cost, and has strong practicability. Because the feeding area and the storage area are connected by a split pipeline, it is not easily affected by the on-site position, the device occupies a small area, has a high utilization rate, is flexible to install, and is simple and convenient to use and operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is the front view of the solid material feeding device of the utility model;

[0020] Figure 2 It is an enlarged view of the negative pressure feeding acceleration device. Specific implementation mode

[0021] To make the technical problems, technical solutions and advantages to be solved by the present utility model clearer, the following will be described in detail with reference to the accompanying drawings and specific embodiments.

[0022] The embodiment of the present utility model provides a solid material feeding device, as Figure 1-2 shown, which includes a feeding hopper 1 and a storage bin 2. An outlet 3 is provided at the bottom of the feeding hopper 1. A negative pressure feeding acceleration device 4 is provided below the outlet 3. The outlet 5 of the negative pressure feeding acceleration device 4 is connected to the inlet 7 of the storage bin 2 through a material conveying pipeline 6. A discharging opening 8 is provided at the bottom of the storage bin 2, and a discharger 9 is provided at the discharging opening 8.

[0023] The negative pressure feeding acceleration device 4 includes an air inlet pipeline 10 and a discharging pipeline 11. The discharging pipeline 11 is provided below the outlet 3, and the bottom of the outlet 3 is communicated with the top of the discharging pipeline 11. The front end of the discharging pipeline 11 is closed, and the outlet 5 at the rear end is connected to the material conveying pipeline 6.

[0024] The front end of the air inlet pipeline 10 is connected to a conveying fan 12, and the diameter of the rear end air outlet is reduced to form a reduced diameter section 13. The reduced diameter section 13 extends into the discharging pipeline 11 from the front end of the discharging pipeline 11, and the reduced diameter section 13 is located below the outlet 3. The diameter of the reduced diameter section 13 is smaller than the diameter of the discharging pipeline 11.

[0025] The present utility model is divided into a feeding area and a storage area. The feeding area is the area where the feeding hopper 1 is located, and the storage area is the area where the storage bin 2 is located. In the feeding area, materials can be added into the feeding hopper 1 manually or mechanically. After starting the conveying fan 12, the materials fall into the negative pressure feeding acceleration device 4, enter the external material conveying pipeline 6 from its outlet 5, are conveyed to the storage area by the material conveying pipeline 6, and enter the storage bin 2 from the inlet 7 of the storage bin 2. The discharger 9 is a discharging device for the storage bin 2 and can discharge materials as needed.

[0026] The negative pressure feeding acceleration device 4 is a feeding device developed according to Bernoulli's principle, which can suck the materials in the feeding hopper 1 into the negative pressure feeding acceleration device 4, avoiding the problems of unsmooth feeding and dust raising caused by reverse air flow, ensuring smooth feeding, having a good dust suppression effect, and improving the working environment in the feeding area.

[0027] Specifically, the delivery fan at the front end of the air inlet duct 10 supplies compressed air and conveys the air backward through pressure. Since the diameter of the constriction section 13 of the air inlet duct 10 is small, the air jets out at high speed from the outlet of the constriction section 13, forming a high-speed air flow below the discharge port 3. According to Bernoulli's principle, the higher the wind speed, the lower the pressure. Therefore, a negative pressure is formed in the part below the discharge port 3, that is, a negative pressure state is formed in the material dropping area, sucking the material at the discharge port 3 into the discharge pipe 11, and then positively conveying it to the storage bin 2 through the material conveying pipe 6.

[0028] In the utility model, the material is sucked into the negative-pressure feeding and accelerating device through negative pressure and positively conveyed to the storage bin, solving the problems of unsmooth material dropping and air return and dust raising caused by positive-pressure plugging at the discharge port in the prior art, making the solid material drop smoothly and being able to mix better with the conveying gas. In addition, there is no need to separately set up a negative-pressure temporary storage chamber, simplifying the equipment structure, reducing the sealing requirement at the same time, having a simple structure, reducing the processing difficulty, reducing the cost, and having strong practicability. Because the feeding area and the storage area are connected by a split pipeline, it is not easily affected by the on-site position, the device occupies a small area, has a high utilization rate, is flexible to install, and is simple and convenient to use and operate.

[0029] As an improvement of the utility model, a negative-pressure air supplement port 16 is arranged on the side wall of the aforementioned feeding hopper 1. The negative-pressure air supplement port 16 provides more external gas for the discharge pipe 11 to ensure the gas conveying flow rate. The included angle between the air inlet direction of the negative-pressure air supplement port 16 and the material dropping direction of the feeding hopper 1 is less than 90°, which is convenient for smooth air supplement.

[0030] At the same time, the negative-pressure air supplement port 16 can also be connected with a dust suction pipe, and the dust suction pipe can also be connected with various enlarged suction devices placed near the device to suck the dust in the nearby area and purify and improve the surrounding working environment.

[0031] The outlet end face of the aforementioned constriction section 13 does not exceed the rearmost end of the discharge port 3, that is, there is a pressure compensation gap between the outlet end face of the constriction section 13 and the end face at the rear of the discharge port 3, so as to facilitate the material to enter the subsequent pipeline and the negative-pressure air supplement port to intake air. The conveying gas in the discharge pipe 11 is mixed with the material to complete speed increase, and then passes through the outlet 5 of the discharge pipe 11 and enters the subsequent conveying system.

[0032] As a preference, the diameter of the constriction section 13 is less than one-third of the diameter of the discharge pipe 11 to provide sufficient negative pressure.

[0033] In one example, there is a tapered transition section 14 between the reduced-diameter section 13 and the inlet air duct 10 with an unchanged diameter. On the part of the tapered transition section 14 and the reduced-diameter section 13 located outside the discharge pipe 11, there is a housing 15 with the same diameter as the inlet air duct 10 with an unchanged diameter. The front end of the housing 15 is connected to the inlet air duct 10 with an unchanged diameter, and the rear end is connected to the front end of the discharge pipe 11.

[0034] A flap valve 17 is provided on the feeding hopper 1. The flap valve 17 is inclined and arranged above the negative-pressure air supplement port 16. Initially, the flap valve 17 is in a closed state. After the conveying fan 12 is started, the flap valve 17 can be manually or automatically opened as needed. The negative-pressure air supplement port 16 provides inlet air after the conveying fan 12 is started. The material falls into the negative-pressure feeding acceleration device 4 after the flap valve 17 is opened, and the air coming from the negative-pressure air supplement port 16 is mixed and enters the external material conveying pipe 6 from the outlet 5 of the negative-pressure feeding acceleration device 4.

[0035] A screen 18 is provided at the top end of the feeding hopper 1. The material is sieved through the screen 18 to remove large pieces and then falls into the lower area of the feeding hopper 1.

[0036] To monitor the amount of material in the storage bin, a high-level material level gauge 19 and a low-level material level gauge 20 are respectively provided at the upper and lower parts of the storage bin 2, which can provide high and low material level alarms to remind when to add material and stop adding material.

[0037] A constant-pressure dust collector 21 is provided at the top of the storage bin 2. After the material reaches the storage bin 2, it is in a positive-pressure state. The upper constant-pressure dust collector 21 exhausts air in time, and dust removal is carried out simultaneously during exhaust, ensuring the pressure balance inside the storage bin 2 and enabling the storage bin 2 to continuously feed materials.

[0038] Some materials will have problems such as damp condensation and caking inside the bin, resulting in poor material discharge. To solve this problem, a heater 22 and a heat-insulating layer are provided on the storage bin 2. A temperature sensor can be set when necessary. The storage bin 2 can be ensured to be within a set range. By setting the upper and lower temperature limits, the start and stop of the heater 22 are automatically controlled. When the temperature reaches the set upper limit, the heater 22 is turned off; when the temperature is lower than the set lower limit, the heater 22 is turned on.

[0039] An inspection opening 23 is provided at the top of the storage bin 2, which can be used to inspect the storage bin 2. The storage bin 2 is arranged on a bracket 24, and the storage bin 2 is supported by the bracket.

[0040] In pneumatic conveying, compressed air, high-pressure centrifugal fans or Roots blowers are generally 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 conveying fan 12 of the present utility model adopts a high-voltage variable-frequency vortex fan, which provides air source through a high-efficiency and low-energy-consuming high-voltage vortex fan, having the effect of energy saving, and at the same time can ensure the effect of pneumatic conveying. It is 80% more energy-efficient than the commonly used Roots blower, and at the same time, the equipment has a smaller volume, occupies less floor area, is lighter in weight, and saves more materials.

[0041] A pressure transmitter 25 is provided at the air outlet of the high-voltage variable-frequency vortex fan, and a temperature sensor 26 is provided on the outer shell of the high-voltage variable-frequency vortex fan to monitor the operating state of the high-voltage 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.

[0042] Similarly, a pressure transmitter can also be provided on the negative-pressure air supply port 16 to monitor the air intake state of the negative-pressure air supply port 16.

[0043] Furthermore, a vibrator is provided on the outer wall of the storage bin 2, and the vibrator is arranged on a support located on the outer wall of the storage bin 2. Through the vibration of the vibrator, the adhesion of materials to the inner wall of the storage bin 2 can be prevented.

[0044] Generally, after the equipment is installed, after-sales service can only be carried out by means of telephone communication or people going to the site, etc. It is impossible to observe the operating state of the equipment at any time, impossible to discover the problems existing in the equipment operation in advance, impossible to provide better services for users, and feedback from users will only be received when problems occur, which often affects the use of users.

[0045] To solve the above problems, the control of various components (such as conveying fans, pressure transmitters, temperature sensors, heaters, vibrators, high-level material level gauges, low-level material level gauges, feeding devices, etc.) of the present utility model 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 interlocking 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.

[0046] The above is the preferred embodiment of the present utility model. It should be noted 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 refinements can still be made, and these improvements and refinements should also be regarded as the protection scope of the present utility model.

Claims

1. A solid material feeding device, characterized in that, It includes a feeding hopper and a storage bin. An outlet is provided at the bottom of the feeding hopper. A negative-pressure feeding acceleration device is provided below the outlet. The outlet of the negative-pressure feeding acceleration device is connected to the inlet of the storage bin through a material conveying pipeline. A discharging opening is provided at the bottom of the storage bin, and a discharger is provided at the discharging opening; The negative-pressure feeding acceleration device includes an air inlet pipeline and a discharging pipeline. The discharging pipeline is provided below the outlet. The bottom of the outlet is communicated with the top of the discharging pipeline. The front end of the discharging pipeline is closed, and the outlet at the rear end is connected to the material conveying pipeline; The front end of the air inlet pipeline is connected to a conveying fan, and the diameter of the air outlet at the rear end is reduced to form a reduced section. The reduced section extends into the discharging pipeline from the front end of the discharging pipeline, and the reduced section is located below the outlet. The diameter of the reduced section is smaller than the diameter of the discharging pipeline.

2. The solid material feeding device according to claim 1, wherein The outlet end face of the reduced section does not exceed the rearmost end of the outlet, and the diameter of the reduced section is less than one-third of the diameter of the discharging pipeline.

3. The solid material feeding device according to claim 2, characterized in that, There is a conical transition section between the reduced section and the air inlet pipeline with an unchanged diameter. The conical transition section and the part of the reduced section outside the discharging pipeline are provided with a housing having the same diameter as the air inlet pipeline with an unchanged diameter.

4. The solid material feeding device according to any one of claims 1-3, characterized in that, A negative-pressure air supplement port is provided on the side wall of the feeding hopper, and the included angle between the air inlet direction of the negative-pressure air supplement port and the material falling direction of the feeding hopper is less than 90°.

5. The solid material feeding device according to claim 4, characterized in that, A slide valve is provided on the feeding hopper. The slide valve is obliquely arranged above the negative-pressure air supplement port, and a screen is provided at the top end of the feeding hopper.

6. The solid material feeding device according to claim 5, characterized in that, A high-level material level gauge and a low-level material level gauge are respectively provided on the upper and lower parts of the storage bin.

7. The solid material feeding device according to claim 6, characterized in that, A constant-pressure dust collector is provided on the top of the storage bin.

8. The solid material feeding device according to claim 7, wherein A heater and a heat preservation layer are provided on the storage bin.

9. The solid material feeding device according to claim 8, characterized in that, An inspection opening is provided on the top of the storage bin, and the storage bin is arranged on a bracket.

10. The solid material feeding device according to claim 9, characterized in that, The conveying fan is a high-pressure variable-frequency vortex fan. A pressure transmitter is provided at the air outlet of the high-pressure variable-frequency vortex fan, and a temperature sensor is provided on the housing of the high-pressure variable-frequency vortex fan.

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