Negative pressure ship unloading system capable of removing dust on line

Abstract

The negative pressure ship unloading system comprises a negative pressure ship unloader, a separation device, a shore conveying pipeline and a vacuum power device, the negative pressure ship unloader comprises a vacuum material conveying pipe and a suction nozzle located at the front end of the vacuum material conveying pipe, and the separation device comprises a material collecting bin and a separator arranged above the material collecting bin; the rear end of the vacuum material conveying pipe is connected with a material collecting bin through a shore conveying pipeline, the separator is connected with a vacuum power device through a main exhaust pipeline and divided into at least two air chambers, a filter bag and a back flushing device located above the filter bag are independently arranged in each air chamber, the top of each air chamber is closed, and a secondary control valve is arranged at the top of each air chamber. And each secondary control valve is connected with the main exhaust pipeline through a secondary exhaust pipeline. The online dust removal device has the online dust removal function, and the defects that in the prior art, due to offline dust removal, a pipeline is blocked, dust is raised at a suction nozzle, a large amount of energy is consumed when the device is restarted, and the overall working efficiency of equipment is low are overcome.

Description

Technical Field

[0001] The invention belongs to the technical field of negative pressure ship unloaders, and in particular relates to a negative pressure ship unloading system with online dust cleaning. Background Art

[0002] like Figure 1 As shown, the working principle of unloading a ship using a negative pressure ship unloader 100 is: a roots blower 201 (vacuum pump) generates negative pressure, and the material is mixed with a certain amount of air through a suction nozzle 101, and then passes through the vacuum conveying pipe 102 on the suction arm and is sent to the separation device 300 through the shore conveying pipe 200. After the material is separated from the air, it falls and is discharged through the discharge valve 311 at the bottom of the collecting bin 310, and the clean air is discharged into the atmosphere from the exhaust port of the roots blower 201 (vacuum pump) through the exhaust pipe 400 from the upper part of the separator 320.

[0003] The separator 320 needs to be blown into high-pressure air by the back-blowing device 500 regularly to shake off the dust attached to the filter bag, so as to improve the air passing capacity of the filter bag and reduce the system pressure loss. At present, in order to improve the cleaning effect, the main control valve 202 needs to be closed during cleaning to make the pipeline system have no airflow and realize offline cleaning. After the cleaning is completed, the main control valve 202 is opened again to restart the air and materials in the pipeline.

[0004] This method has the following disadvantages: 1. Dust will be generated due to reverse blowing at the suction nozzle. 2. After closing the main control valve, the material will fall to the bottom of the pipeline, which is easy to cause pipeline blockage and requires a lot of energy after restarting. 3. The whole process takes a long time, affecting the overall working efficiency of the equipment. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a negative pressure ship unloader separation system with online dust cleaning to overcome the shortcomings of the prior art.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0007] A negative pressure ship unloading system with online dust cleaning comprises a negative pressure ship unloader, a separation device, an onshore conveying pipeline and a vacuum power device, wherein the negative pressure ship unloader comprises a vacuum conveying pipe and a suction nozzle located at the front end of the vacuum conveying pipe, the separation device comprises a material collection bin and a separator arranged above the material collection bin, the rear end of the vacuum conveying pipe is connected to the material collection bin via the onshore conveying pipeline, the separator is connected to the vacuum power device via a main exhaust duct, the separator is divided into at least two air chambers, each of the air chambers is independently provided with a filter bag and a backblowing device located above the filter bag, the top of each air chamber is closed and is respectively provided with a secondary control valve, and the secondary control valves are connected to the main exhaust duct via a secondary exhaust duct.

[0008] In a specific embodiment of the present invention, the backblowing device is connected to an external high-pressure gas source, including a high-pressure jet air nozzle arranged above the filter bag and a solenoid valve for controlling the high-pressure gas to be ejected from the high-pressure jet air nozzle, and the high-pressure jet air nozzle is directed toward the filter bag below.

[0009] In a specific embodiment of the present invention, there are four air chambers.

[0010] In a specific embodiment of the present invention, the vacuum power device is a Roots blower.

[0011] In a specific implementation manner of the present invention, a main control valve is provided on the main exhaust duct.

[0012] In a specific embodiment of the present invention, a controller is further included, and all the secondary control valves and all the solenoid valves of the back-blowing devices are electrically connected to the controller.

[0013] By adopting the above technical solution, the present invention does not need to close the main control valve during dust cleaning. The material is always in a moving suction state in the pipeline. The material will not fall to the bottom of the pipeline, will not cause pipeline blockage, and does not need to restart the material, saving energy and reducing equipment energy consumption. The dust cleaning process will not cause dust at the suction nozzle due to reverse blowing. A single air chamber is cleaned offline, with good cleaning effect, and the system as a whole realizes online dust cleaning. The cleaning process does not require opening and closing the main control valve and material re-acceleration start time, thereby improving the overall work efficiency of the equipment.

[0014] Therefore, the present invention has the function of online dust cleaning, and overcomes the defects of offline dust cleaning in the prior art, such as pipeline blockage, dust at the suction nozzle, large energy consumption when restarting, and low overall working efficiency of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A schematic diagram of a negative pressure ship unloading system in the prior art;

[0016] Figure 2 is a schematic diagram of a negative pressure ship unloading system of the present invention;

[0017] Figure 3 It is a top view of the separation device of the present invention. DETAILED DESCRIPTION

[0018] like Figure 2 As shown, the negative pressure ship unloading system for online dust cleaning of the present invention comprises a negative pressure ship unloader 100, a separation device 300 and a vacuum power device.

[0019] The vacuum conveying pipe 102 of the negative pressure ship unloader 100 has a suction nozzle 101 at the front end, and the rear end is connected to the separation device 300 via the onshore conveying pipeline 200. The separation device 300 is connected to the vacuum power device via the main exhaust pipe 401.

[0020] The separation device 300 is composed of a material collection bin 310 and a separator 320 disposed above the material collection bin. The bottom of the material collection bin 310 is provided with a discharge valve 311. The onshore delivery pipeline 200 is connected between the material collection bin 310 and the negative pressure ship unloader 100.

[0021] In the present invention, the separator 320 is divided into a plurality of air chambers 321. In the present embodiment, the separator 320 is divided into four air chambers 321. A filter bag 322 and a back-blowing device 500 located above the filter bag 322 are independently provided in each air chamber 321. The top of each air chamber 321 is closed and a secondary control valve 323 is provided respectively. Each secondary control valve 323 is connected to the main exhaust duct 401 through a secondary exhaust duct 324. In the present invention, the back-blowing device has a high-pressure jet nozzle arranged above the filter bag 322. The high-pressure jet nozzle faces the filter bag below. The back-blowing device 500 is connected to an external high-pressure gas source, and a solenoid valve for controlling the high-pressure gas to be ejected from the high-pressure jet nozzle is provided on the air pipe of the back-blowing device 500.

[0022] In the present invention, the vacuum power device is a Roots blower 201 (it may also be a vacuum pump), and a main control valve 202 is provided on the main exhaust duct 410 .

[0023] The above is the negative pressure ship unloading system with online dust cleaning of the present invention. When conveying materials normally, the main control valve 202 and all the secondary control valves 323 are opened, and the materials enter the separation device 300 through the suction nozzle 101, the vacuum conveying pipe 102 and the shore conveying pipeline 200 under the negative pressure generated by the Roots blower 201. The materials are intercepted by the filter bags 322 in the four air chambers of the filter 320, and fall out of the bin through the discharge valve 311 at the bottom of the collection bin 310, while the clean air is collected into the main exhaust duct 401 through the four secondary exhaust ducts 324, and discharged into the atmosphere through the exhaust port of the Roots blower 201.

[0024] When the filter bag 322 needs to be back-blown, the secondary control valve 323 at the top of one of the air chambers is closed and the solenoid valve of the back-blowing device 500 in the air chamber is opened, so that the high-pressure jet nozzle of the back-blowing device in the air chamber back-blown the filter bag with high-pressure jets to shake off the dust attached to the filter bag. While the filter bag in the air chamber is back-blown with high-pressure jets, the secondary control valves at the top of other air chambers are kept open to maintain the other air chambers in a smooth working state. After completing the cleaning of one air chamber, the cleaning of other air chambers can be carried out in sequence. When one air chamber stops working for cleaning, the other air chambers are in a smooth working state.

[0025] In the present invention, a controller is also provided, and all the secondary control valves 323 and the solenoid valves of all the back-blowing devices 500 are electrically connected to the controller. In this way, the present invention can use the controller to realize the automatic control of online dust cleaning, that is, automatically control the closing sequence, closing interval time and closing duration of the secondary control valves 323 on each air chamber, and automatically control the opening sequence, opening interval time and opening duration of the solenoid valves of each back-blowing device.

[0026] It can be seen from the above detailed description that the present invention does not need to close the main control valve during cleaning. The material is always in a moving suction state in the pipeline. The material will not fall to the bottom of the pipeline, will not cause pipeline blockage, and does not need to restart the material, saving energy and reducing equipment energy consumption. The cleaning process will not cause dust at the suction nozzle due to reverse blowing. A single air chamber is cleaned offline, and the cleaning effect is good. The system as a whole realizes online cleaning. The cleaning process does not require opening and closing the main control valve and material re-acceleration start-up time, thereby improving the overall work efficiency of the equipment.

Claims

1. A negative pressure ship unloading system with online dust cleaning, comprising a negative pressure ship unloader, a separation device, an onshore conveying pipeline and a vacuum power device, wherein the negative pressure ship unloader comprises a vacuum conveying pipe and a suction nozzle at the front end of the vacuum conveying pipe, the separation device comprises a material collection bin and a separator arranged above the material collection bin, the rear end of the vacuum conveying pipe is connected to the material collection bin via the onshore conveying pipeline, and the separator is connected to the vacuum power device via a main exhaust pipe, characterized in that: The separator is divided into at least two air chambers, each of which is independently provided with a filter bag and a back-blowing device located above the filter bag. The top of each air chamber is closed and is respectively provided with a secondary control valve, and the secondary control valves are connected to the main exhaust duct through a secondary exhaust duct.

2. The negative pressure ship unloading system for online dust cleaning according to claim 1 is characterized in that: The back-blowing device is connected to an external high-pressure gas source, and includes a high-pressure gas jet nozzle disposed above the filter bag and a solenoid valve for controlling the high-pressure gas to be ejected from the high-pressure gas jet nozzle, wherein the high-pressure gas jet nozzle faces the filter bag below.

3. The negative pressure ship unloading system for online dust cleaning according to claim 1 is characterized in that: There are four air chambers.

4. The negative pressure ship unloading system for online dust cleaning according to claim 1 is characterized in that: The vacuum power device is a Roots blower.

5. The negative pressure ship unloading system for online dust cleaning according to claim 1 is characterized in that: The main exhaust duct is provided with a main control valve.

6. The negative pressure ship unloading system for online dust cleaning according to claim 2 is characterized in that: A controller is also included, and all the secondary control valves and all the solenoid valves of the back-blowing devices are electrically connected to the controller.

Images