Powder accurate metering and discharging equipment

Abstract

The utility model provides powder accurate metering and discharging equipment, and relates to the technical field of powder discharging, the powder accurate metering and discharging equipment comprises a material distribution box used for being connected with a powder warehouse discharging port, the discharging port of the material distribution box is connected with a feeding rotor through a first connecting pipe, and the discharging port of the feeding rotor is connected with a double-rotor scale body through a second connecting pipe; the distribution box, the feeding rotor and the buffer stock bin of the birotor scale body are respectively connected with the flow-aiding fan through flow-aiding air pipes, and the feeding rotor is provided with an exhaust and dust removal device in a matched mode. A multi-stage structure of the distribution box, the feeding rotor and the birotor scale body is adopted, control over the powder discharging amount is gradually refined, and compared with single metering equipment, the metering efficiency is greatly improved. The discharging amount can be adjusted more accurately, so that the accuracy of powder metering is improved, the exhausting and dust removing device can separate materials in the feeding rotor from airflow, the airflow is exhausted, metering deviation caused by material floating is reduced, and metering accuracy is effectively improved.

Description

Technical Field

[0001] The present application relates to the technical field of powder feeding, and in particular to a device for accurately metering and feeding powder. Background Art

[0002] Powder materials are widely used in the building materials industry. The main powder materials include fly ash, mineral powder, cement powder, raw material powder, stone powder, etc. The double-rotor scale is a device used for metering and batching, and is often used to weigh powders in the cement production process.

[0003] At present, during the use of conventional dual-rotor scales, materials will form bridges in the buffer silo, resulting in difficulties in discharging. This is a common problem faced by all powder silos. In order to prevent bridging, the buffer silo will be inflated to assist flow. If normal flow assistance cannot discharge the material, the inflation volume will generally be increased. The inflation volume is a parameter that cannot be quantified. If the inflation volume is too large, it will cause material rushing. During rushing, the material will be severely fluidized. General feeders, spiral feeding rotors, star feeders, etc. cannot lock the material. When the actual flow exceeds the given amount, the rotor operating frequency will be too low, resulting in a small unit load, and the rotor reduction motor will heat up. In severe cases, it will cause material jamming and shutdown.

[0004] In order to ensure smooth material discharge, the entire system usually inflates the buffer silo to aid flow, inflates the distribution box, and inflates the chute, but often ignores exhaust. The gas and material are mixed. If the gas-to-material ratio is too high, some material will float in the rotor scale, causing the measurement result to be smaller than the actual amount. There is a deviation between the rated flow of the rotor scale and the actual flow rate. The system's inflation and exhaust volumes are uncontrollable, which will cause the gas-to-material ratio to increase significantly at low flow rates, resulting in inaccurate measurement. Summary of the Invention

[0005] The purpose of the embodiments of the present application is to provide a device for accurately metering and unloading powder, which can solve the technical problems of unstable unloading and inaccurate metering when using a dual-rotor scale for metering and unloading in the prior art.

[0006] An embodiment of the present application provides a precise metering and discharging device for powder, comprising a distribution box for connecting to a discharge port of a powder storage bin, the discharge port of the distribution box being connected to a feeding rotor via a first connecting pipe, the discharge port of the feeding rotor being connected to a dual-rotor scale body via a second connecting pipe, the distribution box, the feeding rotor and the cache silo of the dual-rotor scale body being respectively connected to a flow-assisting fan via a flow-assisting air duct, and the feeding rotor being equipped with an exhaust and dust removal device.

[0007] Furthermore, the exhaust dust removal device includes an air separator, an air suction pipe and an induced draft fan. The air separator is arranged on the top of the feeding rotor and is connected to the feeding rotor. The air separator is connected to the induced draft fan through the air suction pipe.

[0008] Further, a first flap valve is provided at the upper part of the material distribution bin.

[0009] Further, a second flap valve is provided at the lower part of the material distribution bin.

[0010] Further, an air volume control valve is provided on the air-assisted flow duct.

[0011] Further, a dust collection pipe is connected to one side of the second connecting pipe, and the end of the dust collection pipe far from the second connecting pipe is connected to the upper part of the powder bin.

[0012] Further, the air-solid separator is a bag filter or an electrostatic precipitator.

[0013] Further, a receiving tray is provided in the first connecting pipe, and the receiving tray includes a receiving hopper with an upward opening and a feeding pipe connected to the bottom of the receiving hopper.

[0014] Advantages of the present utility model:

[0015] The present utility model adopts a multi-stage structure of a material distribution bin, a feeding rotor and a double-rotor scale body to gradually refine the control of the powder feeding amount. Compared with a single metering device, it can adjust the feeding amount more accurately, thereby improving the accuracy of powder metering. The buffer bins of the material distribution bin, the feeding rotor and the double-rotor scale body are respectively connected to an air-assisted flow fan through an air-assisted flow duct. The air-assisted flow fan and the air-assisted flow duct blow air into the buffer bins of the material distribution bin, the feeding rotor and the double-rotor scale body, so that the powder is in a better fluidized state, ensuring the continuity of the feeding process. The exhaust dust removal device can separate the material in the feeding rotor from the air flow and discharge the air flow, reducing the metering deviation caused by material floating and effectively improving the metering accuracy and certainty. Description of the drawings

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present application and should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0017] Figure 1 It is a schematic structural diagram of some embodiments of the present application;

[0018] Figure 2 It is a left view of some embodiments of the present application;

[0019] The reference numerals are respectively:

[0020] 1. Material distribution box; 2. First connecting pipe; 3. Feeding rotor; 4. Second connecting pipe; 5. Dual-rotor scale body; 6. Air flow assisting air duct; 7. Air flow assisting fan; 8. Exhaust dust removal device; 81. Air-material separator; 82. Suction air duct; 83. Induced draft fan; 9. First slide valve; 10. Second slide valve; 11. Air volume control valve; 12. Dust collection pipe; 13. Material receiving tray; 131. Material receiving hopper; 132. Feeding pipe. Detailed implementation manners

[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Apparently, the described embodiments are some, rather than all, of the embodiments of the present application. The components of the embodiments of the present application described and illustrated herein usually can be arranged and designed in various different configurations.

[0022] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but merely represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts fall within the scope of protection of the present application.

[0023] It should be noted that: Similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0024] In the description of the present application, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings or the orientation or positional relationship in which the product of this application is usually placed when in use. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present application. In addition, the terms "first", "second", "third", etc. are only used for descriptive distinction and cannot be understood as indicating or implying relative importance.

[0025] In addition, the terms "horizontal", "vertical", "hanging", etc. do not mean that the components are required to be absolutely horizontal or hanging, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0026] In the description of the present application, it should also be noted that unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "couple" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations. Specific embodiments

[0028] As Figure 1 and Figure 2 shown, the present application provides a powder precise metering and feeding device, which includes a material distribution box 1 for connecting with the feeding port of a powder bin. The feeding port of the material distribution box 1 is connected with a feeding rotor 3 through a first connecting pipe 2. The feeding port of the feeding rotor 3 is connected with a double-rotor weigher body 5 through a second connecting pipe 4. The feeding rotor 3 and the double-rotor weigher body 5 both belong to the prior art and will not be elaborated herein. Through the sequential connection of the material distribution box 1, the first connecting pipe 2, the feeding rotor 3, the second connecting pipe 4, and the double-rotor weigher body 5, an orderly powder material transmission path is constructed. The material distribution box 1 can prevent a large amount of materials from pouring into subsequent equipment at one time, ensuring the preliminary regulation of the material flow. The feeding rotor 3 plays a role in further regulating the material flow in this path, enabling the materials to enter the double-rotor weigher body 5 with a relatively stable and controllable flow rate. The double-rotor weigher body 5 then precisely measures the materials. The multi-stage structure of the material distribution box 1, the feeding rotor 3, and the double-rotor weigher body 5 gradually refines the control of the powder feeding amount. Compared with a single metering device, it can more precisely adjust the feeding amount, thereby improving the accuracy of powder metering. The buffer bins of the material distribution box 1, the feeding rotor 3, and the double-rotor weigher body 5 are respectively connected with a flow-aiding air pipe 6 and a flow-aiding air blower 7. In this embodiment, the flow-aiding air blower 7 is a Roots blower with adjustable wind speed. The flow-aiding air blower 7 and the flow-aiding air pipe 6 blow air into the buffer bins of the material distribution box 1, the feeding rotor 3, and the double-rotor weigher body 5, making the powder in a better fluidized state and ensuring the continuity of the feeding process. The feeding rotor 3 is equipped with an exhaust and dust removal device 8. The exhaust and dust removal device 8 can separate the materials in the feeding rotor 3 from the air flow and discharge the air flow, reducing the metering deviation caused by material floating and effectively improving the metering accuracy and certainty.

[0029] As Figure 1 and Figure 2As shown in the figure, the exhaust dust removal device 8 includes a gas-solid separator 81, a suction air pipe 82, and an induced draft fan 83. The gas-solid separator 81 is provided at the top of the feeding rotor 3 and is connected to the feeding rotor 3. The gas-solid separator 81 is connected to the induced draft fan 83 through the suction air pipe 82. The induced draft fan 83 serves as a power source and can form a negative pressure in the suction air pipe 82, prompting the gas-solid mixture in the feeding rotor 3 to enter the gas-solid separator 81. After the gas-solid mixture is separated in the gas-solid separator 81, the gas is discharged through the suction air pipe 82. In this embodiment, the internal structure of the feeding rotor 3 is the same as that of the double-rotor weighing body 5. The material in the feeding rotor 3 can pre-stabilize the amount of material in each grid by the volume method, making the double-rotor weighing body 5 more stable when receiving the incoming material, reducing the flow rate fluctuation of the double-rotor weighing body 5. The feeding rotor 3 and the double-rotor weighing body 5 adopt a split structure, which is convenient for later maintenance and repair.

[0030] As Figure 1 and Figure 2 shown, a first plug valve 9 is provided at the upper part of the material distribution box 1. The first plug valve 9 can accurately control the flow rate of the powder material entering the material distribution box 1. By adjusting the opening degree of the first plug valve 9, the cross-sectional area of the channel for the material to enter the material distribution box 1 can be changed, thereby adjusting the flow rate and flow of the material. In this embodiment, the first plug valve 9 is a two-way manual plug valve. The top of the material distribution box 1 is fixedly connected to the bottom of the first plug valve 9, and the top of the first plug valve 9 is connected to the powder silo discharge port.

[0031] As Figure 1 and Figure 2 shown, a second plug valve 10 is provided at the lower part of the material distribution box 1. The second plug valve 10 can accurately control the material discharge amount from the material distribution box 1 to the downstream feeding rotor 3. By adjusting the opening degree of the second plug valve 10, the cross-sectional area of the channel for the material to flow out of the material distribution box 1 can be changed, thereby accurately adjusting the flow rate and flow of the material. When it is necessary to maintain, repair or troubleshoot the device downstream of the material distribution box 1, closing the second plug valve 10 can completely isolate the material distribution box 1 from the downstream device, preventing the material in the material distribution box 1 from continuing to flow into the downstream equipment, avoiding waste caused by material leakage, device pollution, and potential safety threats to maintenance personnel, providing a safe and reliable operating environment for device maintenance and repair work. In this embodiment, the second plug valve 10 is a pneumatic plug valve.

[0032] As Figure 1 and Figure 2 shown, an air volume control valve 11 is provided on the air flow assistance air pipe 6. The air volume control valve 11 can accurately adjust the air volume in the air flow assistance air pipe 6. Different powder materials have different flow characteristics in the buffer bins of the material distribution box 1, the feeding rotor 3, and the double-rotor weighing body 5, and the required air flow assistance volume is also different. By accurately adjusting the air flow assistance volume through the air volume control valve 11, the best air flow assistance effect can be achieved.

[0033] As Figure 1 and Figure 2 shown, one side of the second connecting pipe 4 is connected with a dust collecting pipe 12. The end of the dust collecting pipe 12 far from the second connecting pipe 4 is connected with the upper part of the powder bin. Through the arrangement of the dust collecting pipe 12, part of the air flow in the feeding rotor 3 can flow back into the powder bin through the dust collecting pipe 12, reducing the amount of air flowing downward, thereby reducing the floating of the material in the double-rotor scale and improving the metering accuracy of the double-rotor scale.

[0034] As Figure 1 and Figure 2 shown, the air-material separator 81 is a bag-type dust collector or an electrostatic precipitator. The bag-type dust collector or the electrostatic precipitator is a common dust treatment device in the market, and users can choose to purchase according to actual needs.

[0035] As Figure 1 shown, a receiving tray 13 is arranged in the first connecting pipe 2. The receiving tray 13 includes a receiving hopper 131 with an upward opening and a feeding pipe 132 connected to the bottom of the receiving hopper 131. The receiving tray 13 can play a certain buffering and stabilizing role in the material flow. When there is an instantaneous fluctuation in the feeding amount of the distributing box 1, the material in the receiving hopper 131 can play a buffering effect, and then the material is conveyed to the feeding rotor 3 through the feeding pipe 132 at a relatively stable flow rate.

[0036] The above are only the preferred embodiments of the present application and are not used to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A powder precise metering and discharging device, characterized by: It includes a distribution box for connecting to the discharge port of the powder warehouse, the discharge port of the distribution box is connected to the feeding rotor through a first connecting pipe, the discharge port of the feeding rotor is connected to the dual-rotor scale body through a second connecting pipe, the distribution box, the feeding rotor and the cache silo of the dual-rotor scale body are respectively connected to the flow-aiding fan through a flow-aiding air duct, and the feeding rotor is equipped with an exhaust dust removal device.

2. The powder precise metering and discharging equipment according to claim 1, characterized in that: The exhaust dust removal device includes an air separator, an air suction pipe and an induced draft fan. The air separator is arranged on the top of the feeding rotor and is connected to the feeding rotor. The air separator is connected to the induced draft fan through the air suction pipe.

3. The powder precise metering and discharging equipment according to claim 1, characterized in that: A first plug valve is provided on the upper portion of the material distribution box.

4. The powder precise metering and discharging equipment according to claim 3, characterized in that: A second plug valve is provided at the lower part of the material distribution box.

5. The powder precise metering and discharging equipment according to claim 1, characterized in that: An air volume control valve is provided on the flow-assisting air duct.

6. The powder precise metering and discharging equipment according to claim 2, characterized in that: A dust collecting pipe is connected to one side of the second connecting pipe, and an end of the dust collecting pipe away from the second connecting pipe is connected to the upper part of the powder storage.

7. The powder precise metering and discharging equipment according to claim 2, characterized in that: The gas-material separator is a bag dust collector or an electrostatic dust collector.

8. The powder precise metering and discharging equipment according to claim 1, characterized in that: A material receiving tray is provided in the first connecting pipe, and the material receiving tray comprises a material receiving hopper opening upward and a material discharge pipe connected to the bottom of the material receiving hopper.

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