Negative pressure anti-blocking pneumatic conveying device for water-containing materials and working method

Abstract

The present invention relates to a negative pressure anti-blocking pneumatic conveying device for water-containing materials and a working method, comprising a primary separation and filtration integrated machine, a primary centrifuge, a waterfall-type spiral anti-bridging silo, a primary mixing and accelerating chamber, a primary negative pressure conveying pipeline, a secondary separation and filtration integrated machine, a waterfall-type spiral anti-bridging weighing silo, a secondary mixing and accelerating chamber, a secondary negative pressure conveying pipeline, a secondary centrifuge, a dissolving kettle and a vacuum device, etc. The negative pressure anti-blocking pneumatic conveying device for water-containing materials and the working method are specially designed for wet materials. The device can loosen the bridged and compacted materials, and at the same time, the downstream equipment for forced transmission by rotating blades makes the wet materials loose and conveyed step by step in a fully closed state. Blockage is not easy to occur during the conveying process, which ensures the safety and accuracy of the conveying and meets the conveying requirements of special materials.

Description

Technical field:

[0001] The invention relates to the technical field of material conveying systems, and in particular to a negative pressure anti-blocking pneumatic conveying device for water-containing materials and a working method. Background technology:

[0002] In the prior art, some water-containing materials, such as sodium ascorbic acid vitamin C (VC-NA), are easily blocked during processing, weighing, feeding and transportation because they are wet materials. They need to be cleared regularly, which affects processing efficiency. Summary of the invention:

[0003] The purpose of the present invention is to provide a negative pressure anti-blocking pneumatic conveying device and working method for water-containing materials, which can continuously discharge materials, accurately weigh and is not easy to be blocked, in view of the defects of the prior art.

[0004] The present invention is realized through the following technical scheme: a negative pressure anti-blocking pneumatic conveying device for water-containing materials, comprising a primary separation and filtration integrated machine, a primary centrifuge, a silo, a primary mixing and accelerating chamber, a primary negative pressure conveying pipeline, a secondary separation and filtration integrated machine, a weighing bin, a secondary mixing and accelerating chamber, a secondary negative pressure conveying pipeline, a secondary centrifuge, a dissolving kettle and a vacuum device, wherein the primary separation and filtration integrated machine is sequentially connected to the primary centrifuge through a primary screw conveyor and a primary rotary air lock valve, the primary centrifuge is connected to the silo, the silo is sequentially connected to the primary mixing and accelerating chamber through a secondary screw conveyor and a secondary rotary air lock valve, the primary mixing and accelerating chamber is connected to the primary mixing and accelerating chamber, and the primary mixing and accelerating chamber is connected to the primary centrifuge. The speed chamber is connected to the secondary separation and filtration integrated machine through a primary negative pressure delivery pipeline, the secondary separation and filtration integrated machine is connected to the weighing bin through a three-stage screw conveyor and a three-stage rotary air lock valve, the weighing bin is connected to the secondary mixing acceleration chamber in turn through a four-stage screw conveyor and a four-stage rotary air lock valve, the secondary mixing acceleration chamber is connected to the secondary centrifuge through a secondary negative pressure delivery pipeline, the secondary centrifuge is connected to the dissolution kettle in turn through a five-stage screw conveyor and a five-stage rotary air lock valve, and the vacuum device is respectively connected to the primary negative pressure delivery pipeline, the secondary negative pressure delivery pipeline, the primary separation and filtration integrated machine, the secondary separation and filtration integrated machine, and the secondary centrifuge.

[0005] Among them, the silo, weighing silo, etc. in the present invention adopt a waterfall-type spiral anti-bridging silo, which can loosen the bridging and compacted materials and force the downstream equipment to transmit them through rotating blades.

[0006] In order to measure the moisture content of the wet material, a moisture sensor is provided on the silo.

[0007] In order to facilitate air intake, the primary negative pressure delivery pipeline and the secondary negative pressure delivery pipeline are connected to the air intake filter device.

[0008] In order to further avoid blockage of the negative pressure delivery pipeline, a plurality of automatic air inlet valves and pressure testers are evenly distributed on the first-level negative pressure delivery pipeline.

[0009] Preferably, the first-stage separation and filtration integrated machine and the second-stage separation and filtration integrated machine are waterfall-type separation and filtration integrated machines.

[0010] Preferably, the vacuum device comprises a muffler, a Roots vacuum pump, a Y-type filter and a secondary filter which are connected in sequence.

[0011] The present invention also provides a working method of the above-mentioned negative pressure anti-blocking pneumatic conveying device for water-containing materials, comprising the following steps:

[0012] (1) The wet material enters the centrifuge through the primary separation and filtration integrated machine, and enters the silo after centrifugation;

[0013] (2) The wet material in the silo enters the first-stage mixing and accelerating chamber, where it is aerated and mixed to make the wet material loose, and then enters the second-stage separation and filtration integrated machine through the first-stage negative pressure conveying pipeline;

[0014] (3) The wet material after secondary separation and filtration is sent to the weighing silo, and then sent to the buffer silo after weighing;

[0015] (4) The wet material in the buffer bin enters the secondary mixing and accelerating chamber, and after being aerated and mixed, enters the secondary centrifuge through the secondary negative pressure conveying pipeline;

[0016] (5) The wet material in the secondary centrifuge is quantitatively fed into the user's dissolving kettle to complete the feeding.

[0017] Among them, when the pressure tester on the negative pressure conveying pipeline cannot detect the flow of materials, the automatic air intake valve closest to the pressure tester is opened, and the air is taken in from the point closest to the end, and the negative pressure conveying pipeline is allowed to produce a Venturi negative pressure effect, so that the negative pressure conveying pipeline obtains the maximum pressure value or maintains a certain vacuum state. When the pressure tester detects that the material is running normally, the automatic air intake valve is closed, and all valves in the system resume normal operation; if the previous state fails to effectively restore the material operation within a certain period of time and causes pipe blocking, the next automatic air intake valve is opened in turn until the material is restored to run smoothly in the pipeline. In the process, the material can be mixed by the airflow in a certain loose state, and after entering the silo, the anti-bridging silo will also loosen the material again. In other processes, it is automatically identified and the automatic air intake remains unchanged.

[0018] The beneficial effects of the present invention are as follows: the negative pressure anti-blocking pneumatic conveying device for water-containing materials and the working method are specially designed for wet materials. In a fully closed state, the wet materials are loosened and conveyed step by step. Blockage is not likely to occur during the conveying process, thereby ensuring the safety and accuracy of the conveying and meeting the conveying requirements of special materials. Description of the drawings:

[0019] Figure 1 It is a structural schematic diagram of the negative pressure anti-blocking pneumatic conveying device for water-containing materials and the working method of the present invention. Specific implementation method:

[0020] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0021] like Figure 1 The negative pressure anti-blocking pneumatic conveying device for water-containing materials shown in the figure comprises a primary separation and filtration integrated machine 1, a primary centrifuge 4, a silo 5, a primary mixing and accelerating chamber 9, a primary negative pressure conveying pipeline 13, a secondary separation and filtration integrated machine 14, a weighing bin 17, a secondary mixing and accelerating chamber 21, a secondary negative pressure conveying pipeline 22, a secondary centrifuge 23, a dissolving kettle 26 and a vacuum device, wherein the primary separation and filtration integrated machine 1 is connected to the primary centrifuge 4 in sequence through a primary screw conveyor 2 and a primary rotary air lock valve 3, the primary centrifuge 4 is connected to the silo 5, a moisture sensor 6 is arranged on the silo 5, the silo 5 is connected to the primary mixing and accelerating chamber 9 in sequence through a secondary screw conveyor 7 and a secondary rotary air lock valve 8, the primary mixing and accelerating chamber 9 is connected to the secondary separation and filtration integrated machine 14 through a primary negative pressure conveying pipeline 13, a plurality of automatic air inlet valves 11 and a pressure tester 12 are evenly distributed on the primary negative pressure conveying pipeline 13, the secondary separation and filtration integrated machine 1 4 is connected to the weighing bin 17 through the three-stage screw conveyor 15 and the three-stage rotary air lock valve 16 in sequence, the weighing bin 17 is connected to the two-stage mixing acceleration chamber 21 through the four-stage screw conveyor 18, the buffer bin 19 and the four-stage rotary air lock valve 20 in sequence, the two-stage mixing acceleration chamber 21 is connected to the two-stage centrifuge 23 through the two-stage negative pressure delivery pipeline 22, the two-stage centrifuge 23 is connected to the dissolving kettle 26 through the five-stage screw conveyor 24 and the five-stage rotary air lock valve 25 in sequence, the vacuum device is respectively connected to the one-stage negative pressure delivery pipeline 13, the two-stage negative pressure delivery pipeline 22, the one-stage separation and filtration integrated machine 1, the two-stage separation and filtration integrated machine 14, and the two-stage centrifuge 23, the vacuum device comprises a muffler 27, a Roots vacuum pump 28, a Y-type filter 29 and a two-stage filter 30 connected in sequence, the air outlet of the muffler 27 is connected to the safety collection tower, the one-stage negative pressure delivery pipeline 13 and the two-stage negative pressure delivery pipeline 22 are connected to the air inlet filter device 10.

[0022] The working principle of the present invention is as follows:

[0023] The negative pressure dilute phase conveying system for water-containing materials has 3 first-stage centrifuges 4, with a discharge capacity of 900t / unit / batch, a discharge time of 60 seconds, a single batch centrifugal operation time of 30 minutes, and a maximum of 2 centrifuges in operation.

[0024] Primary transportation: if the horizontal distance is ≤30m and the vertical distance is ≤12m, the three primary centrifuges 4 are used to transport the wet materials to the silo 5. The wet materials in the silo 5 enter the primary mixing and accelerating chamber 9 through the secondary screw conveyor 7 and the secondary rotary air lock valve 8, where they are aerated and mixed to make the wet materials loose. The wet materials then enter the secondary separation and filtration integrated machine 14 through the primary negative pressure conveying pipeline 13.

[0025] The negative pressure conveying pipeline is provided with automatic air intake valves 11 and pressure testers 12 every 12 to 24 meters. When material blockage occurs in any section of the pipeline, that is, the pressure tester 12 cannot detect the flow of materials, the automatic air intake valve 11 closest to the pressure tester 12 is opened, and the closest point to the end is used for air intake at this time, and the pipeline is allowed to produce a Venturi negative pressure effect, so that the maximum pressure value is obtained in the pipeline or a certain vacuum state is maintained. When the pressure tester detects that the material is running normally, the automatic air intake valve is closed, and all valves in the system are restored to normal operation; if the previous state fails to effectively restore the material operation and produce pipe blockage within a certain period of time, the nearest automatic air intake valve is closed, and the previous automatic air intake valve is opened until the smooth operation of the material in the pipeline is restored; if the above process also fails to restore smooth operation within a certain period of time, the previous automatic air intake valve 6, 5, 4...1, etc. is continued to be opened until the entire line is unblocked and operates normally. In all the above processes, the Roots vacuum pump 28 at the end of the pipeline is always in a negative pressure state to provide sufficient vacuum for the pipeline.

[0026] Secondary conveying: if the horizontal is less than 78m and the vertical is less than 18m, the secondary separation and filtration integrated machine 14 conveys the wet materials into two 10m 3 The wet materials in the buffer bin 19 pass through the four-stage rotary air lock valve 20 and enter the secondary mixing acceleration chamber 21. After being aerated and mixed, they enter the eight secondary centrifuges 23 through the secondary negative pressure conveying pipeline 22. The wet materials in the secondary centrifuges 23 are quantitatively sent to the user's dissolving kettle 26.

[0027] The conveying order is first-in, first-out, that is, the corresponding buffer bins below are conveyed in turn according to the order of fullness. If the 1# buffer bin is full, 1# will be conveyed first, and then conveyed to the 10m that gives the priority to send the feeding signal. 3In the weighing bin, when the material in the weighing bin reaches the weighing set value, the system will stop feeding and automatically switch to another weighing bin. The feeding process will be carried out in turn according to the priority order. If the stock volume of the intermediate buffer bin is 4-5t, it is equipped with a 300mm*150mm transparent inspection hole, a DN500 manhole on the top, a square opening for the bottom screw conveyor discharge port, and a quick-opening method for the top of the screw conveyor for easy maintenance. The bottom discharge valve uses a plug valve. Since the material contains 4-5% methanol, the equipment configuration is designed according to the explosion-proof requirements. The explosion-proof level DⅡBT4 and the protection level IP67 can meet the explosion-proof requirements. The process is completely closed. If gas needs to be supplemented, nitrogen or inert gas can be supplemented to prevent excessive oxygen content. There is no gas leakage during the entire operation. The gas discharged by the fan at the end can be collected and treated in an environmentally friendly and safe manner. In the secondary transportation, the materials are transported to the buffer bin in turn and quantitatively fed to the user's dissolving kettle below. The weighing bin shall not discharge materials during the feeding process, nor shall materials be fed during the quantitative discharging process, so as not to affect the weighing accuracy. The user's dissolving kettle has a re-weighing function, which can further check and re-check the measured value of the materials metered into the dissolving kettle at the front end. If the materials in the dissolving kettle are unqualified, they can be transported to the front centrifuge for reprocessing through the conveying system.

[0028] It should be noted that the inner walls of each mechanism or pipeline of the present invention are coated with a PTFE anti-stick coating to further avoid blockage.

[0029] In addition, in the description of the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "set", "provided with", etc. 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 a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. The m (meter) in "horizontal" and "vertical" can be understood as the distance and height parameters required in the actual process. The specific data in this description is not regarded as constant data. The data can be any required data within a design range; "warehouse m" 3 " is also determined according to the parameters set at the actual site and can be of any size. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] Finally, it should be noted that the above embodiments are only specific implementations of the present invention, which are used to illustrate the technical solutions of the present invention, rather than to limit them. The protection scope of the present invention is not limited thereto. Although the present invention is described in detail with reference to the above embodiments, ordinary technicians in the field should understand that any technician familiar with the technical field can still modify the technical solutions recorded in the above embodiments within the technical scope disclosed by the present invention, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A working method of a negative pressure anti-blocking pneumatic conveying device for water-containing materials, the negative pressure anti-blocking pneumatic conveying device for water-containing materials comprising a primary separation and filtration integrated machine, a primary centrifuge, a silo, a primary mixing and accelerating chamber, a primary negative pressure conveying pipeline, a secondary separation and filtration integrated machine, a weighing bin, a buffer bin, a secondary mixing and accelerating chamber, a secondary negative pressure conveying pipeline, a secondary centrifuge, a dissolving kettle and a vacuum device, the primary separation and filtration integrated machine is sequentially connected to the primary centrifuge through a primary screw conveyor and a primary rotary air lock valve, the primary centrifuge is connected to the silo, the silo is sequentially connected to the primary mixing and accelerating chamber through a secondary screw conveyor and a secondary rotary air lock valve, the The primary mixing and accelerating chamber is connected to the secondary separation and filtration integrated machine through the primary negative pressure delivery pipeline, the secondary separation and filtration integrated machine is connected to the weighing bin through the third-level screw conveyor and the third-level rotary air lock valve, the weighing bin is connected to the secondary mixing and accelerating chamber in sequence through the fourth-level screw conveyor, the buffer bin, and the fourth-level rotary air lock valve, the second-level mixing and accelerating chamber is connected to the second-level centrifuge through the second-level negative pressure delivery pipeline, the second-level centrifuge is connected to the dissolution kettle in sequence through the fifth-level screw conveyor and the fifth-level rotary air lock valve, and the vacuum device is respectively connected to the primary negative pressure delivery pipeline, the second-level negative pressure delivery pipeline, the primary separation and filtration integrated machine, the second-level separation and filtration integrated machine, and the second-level centrifuge; It is characterized in that The working method comprises the following steps: (1) The wet material enters the first-stage centrifuge through the first-stage separation and filtration integrated machine, and enters the silo after centrifugation; (2) The wet material in the silo enters the first-stage mixing and accelerating chamber, where it is aerated and mixed to make the wet material loose, and then enters the second-stage separation and filtration integrated machine through the first-stage negative pressure conveying pipeline; (3) The wet material after secondary separation and filtration is sent to the weighing silo, and then sent to the buffer silo after weighing; (4) The wet material in the buffer bin enters the secondary mixing and accelerating chamber, and after being aerated and mixed, enters the secondary centrifuge through the secondary negative pressure conveying pipeline; (5) The wet material in the secondary centrifuge is quantitatively fed into the user's dissolving kettle to complete the feeding.

2. The working method of the negative pressure anti-blocking pneumatic conveying device for water-containing materials according to claim 1 is characterized in that: When the pressure tester on the negative pressure conveying pipeline cannot detect the flow of material, the automatic air intake valve closest to the pressure tester is opened, and air is taken in from the point closest to the end. At the same time, the negative pressure conveying pipeline is allowed to produce a Venturi negative pressure effect, so that the negative pressure conveying pipeline obtains the maximum pressure value or maintains a certain vacuum state. When the pressure tester detects that the material is running normally, the automatic air intake valve is closed, and all valves in the system return to normal operation. If the previous state fails to effectively restore the material operation within a certain period of time and causes pipe blockage, the next automatic air intake valve is opened in turn until the smooth operation of the material in the pipeline is restored.

3. The working method of the negative pressure anti-blocking pneumatic conveying device for water-containing materials according to claim 1 is characterized in that: The silo is provided with a moisture sensor.

4. The working method of the negative pressure anti-blocking pneumatic conveying device for water-containing materials according to claim 1 is characterized in that: The primary negative pressure delivery pipeline and the secondary negative pressure delivery pipeline are connected to the air inlet filter device.

5. The working method of the negative pressure anti-blocking pneumatic conveying device for water-containing materials according to claim 1 is characterized in that: A plurality of automatic air inlet valves and pressure testers are evenly distributed on the first-level negative pressure delivery pipeline.

6. The working method of the negative pressure anti-blocking pneumatic conveying device for water-containing materials according to claim 1 is characterized in that: The first-stage separation and filtration integrated machine and the second-stage separation and filtration integrated machine are waterfall-type separation and filtration integrated machines.

7. The working method of the negative pressure anti-blocking pneumatic conveying device for water-containing materials according to claim 1 is characterized in that: The vacuum device comprises a silencer, a Roots vacuum pump, a Y-type filter and a secondary filter which are connected in sequence.

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