A long-distance pneumatic conveying system for zinc powder using nitrogen protection

Abstract

The present invention discloses a long-distance pneumatic conveying system of zinc powder using nitrogen protection, comprising a blower, a plurality of discharge bins and a plurality of storage bins, the outlet end of the blower is connected to a conveying pipeline, the outlet of each discharge bin is connected to the conveying pipeline, the conveying pipeline is divided into a plurality of conveying pipeline branches by a multi-way joint after the discharge bin, each conveying pipeline branch is connected to the air inlet of each storage bin, an air inlet valve is arranged on each conveying pipeline branch, the air outlet of each storage bin is connected to the air inlet end of the blower through a conveying pipeline, and an air outlet valve is arranged behind the air outlet of each storage bin, a nitrogen tank is connected to the conveying pipeline, and the nitrogen tank is located before the air inlet end of the blower. The present invention adopts nitrogen as a conveying medium for closed-loop circulation, which can not only realize the long-distance pneumatic conveying of zinc powder, but also can convey the zinc powder in any designated discharge bin to any designated storage bin as needed.

Description

Technical Field

[0001] The invention relates to the technical field of powder material transportation, and in particular to a long-distance pneumatic transportation system for zinc powder protected by nitrogen. Background Art

[0002] Pneumatic conveying systems are usually used for low specific gravity (generally specific gravity ≤ 1.5g / cm 3 ), short-distance (generally no more than 20m) powder material transportation, and generally can only be used for single-point to single-point or multi-point to single-point transportation. If powder materials in multiple locations are to be transported to the same silo, multiple conveyor lines are required. When the powder materials at each discharge point need to be transported to different storage locations separately, separate conveyor lines can only be built for each storage silo. In this way, the conveying system is complex and the construction cost is high, and the silos cannot be switched with each other. In addition, ordinary pneumatic conveying systems usually use open circuit form with air as the conveying medium, which is not suitable for materials that are sensitive to oxygen and moisture, and are not suitable for powder materials with high specific gravity and adhesion, such as zinc powder (specific gravity 3.2-3.5g / cm 3 ) transportation. Summary of the invention

[0003] The purpose of the present invention is to provide a long-distance pneumatic conveying system for zinc powder using nitrogen protection in view of the problem that the current ordinary pneumatic conveying system has many defects when used and cannot be applied to the production and transportation of zinc powder. The pneumatic conveying system can not only realize the long-distance transportation of zinc powder, but also can transport the zinc powder in any specified discharge bin to any specified storage bin as needed.

[0004] In order to achieve the above object, the technical solution adopted by the present invention is:

[0005] A long-distance pneumatic conveying system for zinc powder protected by nitrogen comprises a fan, a plurality of discharge bins and a plurality of storage bins, the air outlet end of the fan is connected to a conveying pipeline, the discharge port of each discharge bin is connected to the conveying pipeline, the conveying pipeline is divided into a plurality of conveying pipeline branches by a multi-way joint after the discharge bin, each conveying pipeline branch is connected to an air inlet of each storage bin, an air inlet valve is arranged on each conveying pipeline branch, the air outlet of each storage bin is connected to the air inlet end of the fan through the conveying pipeline, and an air outlet valve is arranged behind the air outlet of each storage bin, the conveying pipeline is connected to a nitrogen tank, and the nitrogen tank is located before the air inlet end of the fan.

[0006] The present invention adopts nitrogen as a conveying medium for closed-loop circulation, which can protect the zinc powder conveying, save nitrogen and reduce production costs. When it is necessary to switch the storage bins corresponding to each discharge bin, it is only necessary to open the air outlet valve of the storage bin that needs to be transported at a fixed point and the air inlet valve of the corresponding conveying pipeline branch, and close the air outlet valve and the air inlet valve corresponding to other storage bins, and then open the corresponding discharge bin to allow the zinc powder to enter the conveying pipeline, so that the zinc powder can be transported to the designated storage bin with the help of the circulating nitrogen. The pneumatic conveying system not only meets the requirements for the production and transportation of zinc powder, realizes the long-distance pneumatic conveying of zinc powder, but also can transport the zinc powder in any designated discharge bin to any designated storage bin as needed.

[0007] As a preferred solution of the present invention, the long-distance pneumatic conveying system of zinc powder protected by nitrogen also includes a PLC control system, which is connected to the fan, the discharge bin, the air inlet valve, and the air outlet valve through a control circuit. By adopting the above technical solution, the selection of the bin can be completed by simply modifying the storage bin corresponding to each discharge bin on the operation panel, thereby realizing the automatic switching operation between the bins.

[0008] As a preferred embodiment of the present invention, the long-distance pneumatic conveying system of zinc powder protected by nitrogen further comprises a radiator and a thermometer, which are connected to the conveying pipeline. The radiator is used to dissipate heat and cool the entire system, and the thermometer monitors the system temperature in real time.

[0009] As a preferred embodiment of the present invention, the long-distance pneumatic conveying system of zinc powder protected by nitrogen further comprises a pressure gauge and a pressure relief valve, which are connected to the conveying pipeline. The pressure gauge is provided to monitor the system pressure, and when the system pressure is too high, the pressure relief valve is opened to automatically exhaust the air.

[0010] As a preferred embodiment of the present invention, the zinc powder long-distance pneumatic conveying system using nitrogen protection further includes an oxygen concentration detector and a nitrogen replenishing valve, wherein the oxygen concentration detector is arranged on the conveying pipeline, and the nitrogen replenishing valve is arranged behind the outlet of the nitrogen tank. The oxygen content of the system is monitored by arranging the oxygen concentration detector, and when it is detected that the oxygen concentration of the system exceeds the standard, the system is automatically filled with nitrogen by opening the nitrogen replenishing valve.

[0011] As a preferred embodiment of the present invention, the discharge bin comprises a bin, a discharge valve, a screw feeder and an acceleration chamber connected in sequence, and the outlet of the acceleration chamber is connected to a conveying pipeline. When in use, the discharge valve is opened, and the zinc powder in the bin enters the screw feeder, then enters the acceleration chamber through the screw feeder, and then enters the conveying pipeline from the acceleration chamber.

[0012] As a preferred embodiment of the present invention, the blower is a Roots blower.

[0013] As a preferred embodiment of the present invention, the storage bin is integrated with a dust collector, which is mainly used to separate the nitrogen and zinc powder entering the storage bin. After separation by the dust collector, the zinc powder falls into the hopper below the storage bin, and the purified nitrogen returns to the conveying pipeline for recycling.

[0014] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0015] The present invention adopts nitrogen as a conveying medium for closed-loop circulation, which can protect the zinc powder conveying, save nitrogen and reduce production costs. When it is necessary to switch the storage bins corresponding to each discharge bin, it is only necessary to open the air outlet valve of the storage bin that needs to be transported at a fixed point and the air inlet valve of the corresponding conveying pipeline branch, and close the air outlet valve and the air inlet valve corresponding to other storage bins, and then open the corresponding discharge bin to allow the zinc powder to enter the conveying pipeline, so that the zinc powder can be transported to the designated storage bin with the help of the circulating nitrogen. The pneumatic conveying system not only meets the requirements for the production and transportation of zinc powder, realizes the long-distance pneumatic conveying of zinc powder, but also can transport the zinc powder in any designated discharge bin to any designated storage bin as needed. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 Schematic diagram of the long-distance pneumatic conveying system of zinc powder protected by nitrogen in the present invention.

[0017] Figure 2 for Figure 1 Schematic diagram of the discharge bin in .

[0018] Markings in the figure: 1-discharge bin, 1.1-bin, 1.2-discharge valve, 1.3-screw feeder, 1.4-acceleration chamber, 2-discharge bin, 3-discharge bin, 4-conveying pipeline, 5-Roots blower, 6-nitrogen tank, 7-pressure relief valve, 8-thermometer, 9-pressure gauge, 10-oxygen concentration detector, 11-storage bin, 12-storage bin, 13-storage bin, 14-air inlet valve, 15-air inlet valve, 16-air inlet valve, 17-finned radiator, 18-air outlet valve, 19-air outlet valve, 20-air outlet valve, 21-nitrogen replenishment valve. DETAILED DESCRIPTION

[0019] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0020] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention. Example

[0021] This embodiment provides a long-distance pneumatic conveying system for zinc powder using nitrogen protection;

[0022] like Figure 1 and Figure 2 As shown, the long-distance pneumatic conveying system of zinc powder using nitrogen protection in this embodiment includes a Roots blower 5, three discharge bins and three storage bins, the air outlet end of the Roots blower 5 is connected to the conveying pipe 4, the discharge port of each of the discharge bins is connected to the conveying pipe, the conveying pipe is divided into a plurality of conveying pipe branches by a multi-way joint after the discharge bin, each conveying pipe branch is connected to the air inlet of each storage bin, an air inlet valve is provided on each conveying pipe branch, the air outlet of each storage bin is connected to the air inlet end of the Roots blower 5 through the conveying pipe, and an air outlet valve is provided after the air outlet of each storage bin, the conveying pipe 4 is connected to a nitrogen tank 6, and the nitrogen tank 6 is located before the air inlet end of the Roots blower 5.

[0023] The present invention adopts nitrogen as a conveying medium for closed-loop circulation, which can protect the zinc powder conveying, save nitrogen and reduce production costs. When it is necessary to switch the storage bins corresponding to each discharge bin, it is only necessary to open the air outlet valve of the storage bin that needs to be transported at a fixed point and the air inlet valve of the corresponding conveying pipeline branch, and close the air outlet valve and the air inlet valve corresponding to other storage bins, and then open the corresponding discharge bin to allow the zinc powder to enter the conveying pipeline, so that the zinc powder can be transported to the designated storage bin with the help of the circulating nitrogen. The pneumatic conveying system not only meets the requirements for the production and transportation of zinc powder, realizes the long-distance pneumatic conveying of zinc powder, but also can transport the zinc powder in any designated discharge bin to any designated storage bin as needed.

[0024] In this embodiment, the zinc powder long-distance pneumatic conveying system using nitrogen protection also includes a PLC control system, and the PLC control system is connected to the Roots blower 5, the discharge bin, the air inlet valve, and the air outlet valve through a control circuit. By adopting the above technical solution, the selection of the bin can be completed by simply modifying the storage bin corresponding to each discharge bin on the operation panel, thereby realizing the automatic switching operation between the bins.

[0025] In this embodiment, the zinc powder long-distance pneumatic conveying system using nitrogen protection also includes a finned radiator 17 and a thermometer 8, and the finned radiator 17 and the thermometer 8 are connected to the conveying pipeline 4. The finned radiator is used to dissipate heat and cool the entire system, and the thermometer monitors the system temperature in real time. Specifically, the finned radiator 17 is located on the conveying pipeline after the storage bin, and the thermometer 8 is located on the conveying pipeline between the storage bin and the finned radiator, and the thermometer 8 is electrically connected to the controller so as to provide real-time feedback of the system temperature to the controller and automatically alarm and shut down when the system temperature is abnormal.

[0026] In this embodiment, the long-distance pneumatic conveying system of zinc powder protected by nitrogen further includes a pressure gauge 9 and a pressure relief valve 7, and the pressure gauge 9 and the pressure relief valve 7 are connected to the conveying pipeline 4. The system pressure is monitored by setting a pressure gauge, and when the system pressure is too high, the pressure relief valve is opened to automatically exhaust the gas. Specifically, the pressure gauge 9 and the pressure relief valve 7 are also arranged on the conveying pipeline between the storage bin and the finned radiator 17, and the press 9 and the pressure relief valve 7 are electrically connected to the controller so as to provide real-time feedback of the system pressure to the controller and automatically open the pressure relief valve to exhaust the gas when the system pressure is too high.

[0027] In this embodiment, the zinc powder long-distance pneumatic conveying system using nitrogen protection also includes an oxygen concentration detector 10 and a nitrogen replenishing valve 21. The oxygen concentration detector 10 is arranged on the conveying pipeline 4, and the nitrogen replenishing valve 21 is arranged after the outlet of the nitrogen tank 6. The oxygen content of the system is monitored by setting the oxygen concentration detector. When it is detected that the oxygen concentration of the system exceeds the standard, the system is automatically filled with nitrogen by opening the nitrogen replenishing valve. Specifically, the oxygen concentration detector 10 is located on the conveying pipeline from the storage bin to the finned radiator 17. The oxygen concentration detector 10 and the nitrogen replenishing valve 21 are electrically connected to the controller so as to provide real-time feedback of the system oxygen content to the controller and automatically open the nitrogen replenishing valve to fill the system with nitrogen when the oxygen concentration of the system exceeds the standard.

[0028] In this embodiment, the discharge bin 1 includes a bin 1.1, a discharge valve 1.2, a screw feeder 1.3 and an acceleration chamber 1.4 connected in sequence, and the outlet of the acceleration chamber 1.4 is connected to the conveying pipeline 4. When in use, the zinc powder in the bin enters the screw feeder after the discharge valve is opened, and then enters the acceleration chamber through the screw feeder, and then enters the conveying pipeline from the acceleration chamber. Specifically, the discharge valve 1.2 is arranged on the discharge pipe at the bottom of the bin 1.1, and the discharge pipe is connected to the feed port of the screw feeder 1.3, the acceleration chamber 1.4 is a small upper and large lower structure, and the upper end of the acceleration chamber 1.4 is connected to the discharge port of the screw feeder 1.3, the lower end of the acceleration chamber 1.4 is connected to the side wall of the conveying pipeline 4, and the acceleration chamber 1.4 has an inclined side (that is, the side of the acceleration chamber opposite to the airflow direction of the conveying pipeline is an inclined surface), so that the zinc powder entry direction is in an acute angle state with the airflow direction, rather than perpendicular to the airflow direction, thereby reducing the resistance of the zinc powder entering the conveying pipeline.

[0029] In this embodiment, each storage bin is integrated with a dust collector, which is mainly used to separate the nitrogen and zinc powder entering the storage bin. After separation by the dust collector, the zinc powder falls into the hopper below the storage bin, and the purified nitrogen returns to the conveying pipeline for recycling.

[0030] The specific operation is as follows: 1) Open the air outlet valve 18 and the air inlet valve 14 on the storage bin 11, start the Roots blower 5, open the discharge valve 1.2 below the discharge bin 1, start the screw feeder 1.3, and the material in the discharge bin 1 is sent into the conveying pipe 4 through the screw, and is driven by the airflow to the storage bin 11. After separation by the dust collector, the material falls into the hopper below, and the purified gas returns to the conveying pipe 4. This cycle is repeated until the material in the discharge bin 1 is transported. Then, the discharge valve 1.2 below the discharge bin 1 is closed, and the screw feeder 1.3 is stopped;

[0031] 2) Open the air outlet valve 19 and the air inlet valve 15 on the storage bin 12, then close the air outlet valve 18 and the air inlet valve 14 on the storage bin 11, open the discharge valve below the discharge bin 2, start the screw feeder, and the material in the discharge bin 2 is sent into the conveying pipeline through the screw, and is driven by the airflow to the storage bin 12. After separation by the dust collector, the material falls into the hopper below, and the purified clean gas returns to the conveying pipeline 4. This cycle continues until the material in the discharge bin 2 is transported, and the discharge valve below the discharge bin 2 is closed, and the screw feeder is stopped;

[0032] 3) Open the air outlet valve 20 and the air inlet valve 16 on the storage bin 13, then close the air outlet valve 19 and the air inlet valve 15 on the storage bin 12, open the discharge valve below the discharge bin 3, start the screw feeder, and the material in the discharge bin 3 is sent into the conveying pipeline through the screw, and is driven by the airflow to the storage bin 13. After separation by the dust collector, the material falls into the hopper below, and the purified clean gas returns to the conveying pipeline 4. This cycle continues until the material in the discharge bin 3 is transported. Close the discharge valve below the discharge bin 3 and stop the screw feeder;

[0033] Through the above operations, the material in the discharge bin 1 is transported to the storage bin 11 , the material in the discharge bin 2 is transported to the storage bin 12 , and the material in the discharge bin 3 is transported to the storage bin 13 .

[0034] When it is necessary to switch the storage bin corresponding to each discharge bin, it is only necessary to open the air outlet valve of the storage bin that needs to be transported at a fixed point and the air inlet valve of the corresponding conveying pipeline branch, and close the air outlet valve and air inlet valve corresponding to other storage bins, and then open the discharge valve under the corresponding discharge bin, and start the screw feeder, so that the material in any specified discharge bin can be transported to any specified storage bin.

[0035] The thermometer 8, pressure gauge 9 and oxygen concentration detector 10 installed on the conveying pipeline of the pneumatic conveying system in this embodiment jointly monitor the system status online. When the thermometer 8 detects that the system temperature is abnormal, the system automatically alarms and shuts down; when the pressure gauge 9 detects that the system pressure is too high, the pressure relief valve 7 is automatically opened to exhaust; when the oxygen concentration detector 10 detects that the system oxygen concentration exceeds the standard, the nitrogen replenishment valve 21 is automatically opened to fill the system with nitrogen.

[0036] All valves and motors in the pneumatic conveying system of this embodiment are controlled by a self-developed PLC control system. The selection of the material bin can be completed by modifying the storage bin corresponding to each discharge bin on the operation panel, and all the above operations can be performed by simply starting directly. In actual production, zinc powder has been successfully transported to a storage bin 120m away, and free switching of transportation from any point to any point can be achieved.

[0037] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A long-distance pneumatic conveying system for zinc powder using nitrogen protection, characterized in that: It includes a fan, a plurality of discharge bins and a plurality of storage bins, the air outlet end of the fan is connected to a conveying pipeline, the discharge port of each discharge bin is connected to the conveying pipeline, the conveying pipeline is divided into a plurality of conveying pipeline branches by a multi-way joint after the discharge bin, each conveying pipeline branch is connected to the air inlet of each storage bin, an air inlet valve is arranged on each conveying pipeline branch, the air outlet of each storage bin is connected to the air inlet end of the fan through a conveying pipeline, and an air outlet valve is arranged behind the air outlet of each storage bin, a nitrogen tank is connected to the conveying pipeline, the nitrogen tank is located before the air inlet end of the fan, and it also includes an oxygen concentration detector and a nitrogen replenishing valve, the oxygen concentration detector is arranged on the conveying pipeline, the nitrogen replenishing valve is arranged behind the outlet of the nitrogen tank, and is used for automatically replenishing nitrogen to the conveying pipeline by opening the nitrogen replenishing valve when it is detected that the oxygen concentration of the system exceeds the standard; The discharge bin comprises a bin, a discharge valve, a screw feeder and an acceleration chamber connected in sequence, and the outlet of the acceleration chamber is connected to a conveying pipeline; When it is necessary to switch the storage bins corresponding to each discharge bin, it is only necessary to open the air outlet valve of the storage bin that needs fixed-point delivery and the air inlet valve of the corresponding delivery pipeline branch, and close the air outlet valve and air inlet valve corresponding to other storage bins, and then open the discharge valve under the corresponding discharge bin and start the screw feeder.

2. The long-distance pneumatic conveying system of zinc powder using nitrogen protection according to claim 1 is characterized in that: It also includes a PLC control system, which is connected to the fan, the discharge bin, the air inlet valve, and the air outlet valve through a control circuit.

3. The long-distance pneumatic conveying system for zinc powder using nitrogen protection according to claim 2 is characterized in that: The device also comprises a radiator and a thermometer, wherein the radiator and the thermometer are connected to the conveying pipeline.

4. The long-distance pneumatic conveying system for zinc powder using nitrogen protection according to claim 3 is characterized in that: The utility model also comprises a pressure gauge and a pressure relief valve, wherein the pressure gauge and the pressure relief valve are connected to the conveying pipeline.

5. The long-distance pneumatic conveying system for zinc powder using nitrogen protection according to any one of claims 1 to 4, characterized in that: The blower is a Roots blower.

6. The long-distance pneumatic conveying system for zinc powder using nitrogen protection according to any one of claims 1 to 4, characterized in that: The storage bin is integrated with a dust collector.

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