Nitrogen pressure stabilizing system of slice conveying pipeline

Abstract

The utility model discloses a nitrogen pressure stabilizing system of a slice conveying pipeline in the technical field of slice conveying, which comprises a slice temporary storage tank, a slice stock bin, a nitrogen filter, a compressor, a control valve and a nitrogen storage tank, the slice temporary storage tank is connected with the slice stock bin, and the nitrogen storage tank is communicated with a feed port pipeline and a discharge port pipeline of the slice temporary storage tank. The nitrogen filter and the compressor are sequentially communicated with each other, a pressure gauge is further arranged at the front end of the compressor, a control valve is additionally arranged, external nitrogen is conveyed to a discharging pipeline of the slice stock bin, and a discharging port can keep full of nitrogen; it is ensured that external air cannot enter the slice stock bin and a pipeline of the slice stock bin, nitrogen can be provided for the nitrogen compressor through the control valve, the pressure of the air inlet end of the nitrogen compressor is constant, and then the pressure of the whole slice raw material conveying pipeline is kept stable all the time.

Description

TECHNICAL FIELD

[0001] The utility model relates to a slice conveying technical field, especially a nitrogen pressure stabilizing system of slice conveying pipeline. BACKGROUND

[0002] Polyamide 6 chip, also known as chip, is produced by using polymerization process in chip product production, and the main production process of polyamide 6 chip needs to go through: caprolactam storage, modification, polymerization, granulation, extraction, drying, cooling, conveying and storage.

[0003] The conveying and storage section needs to use high-pressure nitrogen to convey through the pipeline to ensure that the chip product will not be oxidized and the conveying efficiency is high, and the entire pipeline system needs to be filled with nitrogen. The circulating nitrogen in the pipeline system is provided by the engineering station and stored through the nitrogen storage tank. The slice bin is swept by using the pulsating high-pressure sweeping method to achieve the purpose of dehumidification, oxygen removal and purification. A part of nitrogen needs to be left in the slice bin as a pressure maintaining sealing function, and another part of nitrogen needs to be circulated in the conveying pipeline as a conveying power and recycled through the nitrogen pressurizing equipment.

[0004] In the production of chip conveying and packaging, the chip in the slice bin needs to be packaged and sealed with ton bags. When the bin conveys the chip outward, the nitrogen in the bin will flow out with the raw material, causing the internal pressure of the bin to continue to drop. At this time, nitrogen needs to be supplemented into the bin to ensure that the nitrogen in the bin maintains positive pressure, thereby ensuring that external oxygen cannot enter the bin. However, the speed of manual packaging of chips is uncontrollable, which makes it difficult to stably control the pressure in the slice bin. Too fast packaging will cause the pressure in the slice bin to be low, and the backflow of nitrogen at the top of the slice bin will be less. Too slow packaging will cause the pressure in the chip conveying pipeline to be too large, which will all affect the large fluctuation of the nitrogen pressure in the conveying pipeline. Frequent changes in the pressure of such a pipeline will cause the nitrogen pressurizing equipment to frequently stop due to overpressure, and the frequent stop of the nitrogen compressor will in turn affect the nitrogen pressure in the slice conveying pipeline. The shutdown of the nitrogen pressurizing equipment will cause the nitrogen pressure in the pipeline to decrease, and a series of subsequent nitrogen pressures will decrease. The sudden operation of the nitrogen pressurizing equipment will cause the subsequent nitrogen pressure to be too large, causing the chip conveying capacity to increase suddenly, which will cause the pressure of the bin to be too large, the chip in the chip temporary tank cannot be conveyed backward, and the normal operation of the entire chip production process will be affected. Furthermore, the frequent stop of the nitrogen pressurizing equipment will also affect the service life of the equipment.

[0005] Therefore, the utility model designs a nitrogen pressure stabilizing system of slice conveying pipeline to solve the above problems. UTILITY MODEL CONTENTS

[0006] The utility model discloses a purpose lies in providing a kind of nitrogen pressure stabilizing system of slice conveying pipeline, the pressure of slice temporary storage tank and slice raw material's conveying pipeline keeps stable, simultaneously still increase the pipeline of suction nitrogen in the top of slice bunker, to reach the purpose of conveying slice, simultaneously increase control valve, nitrogen gas is conveyed to slice bunker discharge pipeline from outside, so that discharge port can also keep nitrogen gas full, ensure that external air cannot enter slice bunker and its pipeline, nitrogen gas compressor can also be provided with nitrogen by control valve, make its intake end pressure constant, and then make the conveying pipeline of entire slice raw material keep pressure stable.

[0007] The utility model is realized as follows: a kind of nitrogen pressure stabilizing system of slice conveying pipeline, comprising:

[0008] Slice temporary storage tank, slice bunker, nitrogen filter, compressor, control valve and nitrogen storage tank;

[0009] The slice temporary storage tank is closed tank body, the feed inlet of the slice temporary storage tank is sealingly connected with the front end raw material conveying pipeline,

[0010] The slice bunker is closed bunker, the discharge port of the slice temporary storage tank is sealingly connected with the feed inlet of slice bunker, the top of the slice bunker is additionally provided with exhaust port, the bottom of the slice bunker is connected with discharge pipeline, and the discharge pipeline of the slice bunker is provided with raw material packaging equipment below.

[0011] The nitrogen storage tank is closed tank body, nitrogen delivery valve is arranged at the front end of the nitrogen storage tank, and the nitrogen storage tank is communicated with external nitrogen pipeline through the nitrogen delivery valve;The gas outlet of the nitrogen storage tank is communicated with the feed inlet and the discharge port pipeline of the slice temporary storage tank through a tee joint.

[0012] The gas inlet of the nitrogen filter is communicated with the exhaust port on the top of the slice bunker, the gas outlet of the nitrogen filter is communicated with the gas inlet of the compressor, and the gas outlet of the compressor is also communicated with the nitrogen storage tank through a pipeline.

[0013] The control valve is an electric tee joint valve, and the front end of the control valve is communicated with external nitrogen pipeline.

[0014] The first gas outlet of the control valve is communicated with the discharge pipeline of the slice bunker, the second gas outlet of the control valve is connected to the pipeline between the nitrogen filter and the compressor, and a pressure gauge is further arranged on the pipeline of the second gas outlet of the control valve, and the gas outlet of the nitrogen filter, the gas inlet of the compressor and the second gas outlet of the control valve are all communicated with the pipeline where the pressure gauge is arranged.

[0015] Further, the packaging equipment is an automatic bagging machine.

[0016] Further, the first gas outlet of the control valve is further provided with a gas outlet maintenance valve, and the gas inlet of the control valve is provided with a gas inlet maintenance valve.

[0017] The gas outlet maintenance valve and the gas inlet maintenance valve are both manual gas valves.

[0018] Further, the gas outlet pipeline of the compressor is connected to the bottom of the inner cavity of the nitrogen storage tank, the nitrogen delivery valve is connected to the top of the inner cavity of the nitrogen storage tank, and the gas outlet of the nitrogen storage tank is also arranged at the top of the inner cavity.

[0019] And the gas inlet pipeline and the gas outlet pipeline of the nitrogen storage tank are both horizontally arranged.

[0020] Further, a one-way valve is arranged on the gas outlet at the top of the slice material bin, and a filter screen is further arranged on the gas outlet at the top of the slice material bin.

[0021] The beneficial effects of the present application are as follows: 1. The present application increases nitrogen delivery pipelines at the inlet and outlet of the slice temporary storage tank, so that the nitrogen pressure in the internal and external pipelines of the slice temporary storage tank is stable, the purpose of continuously delivering slice raw materials to the slice material bin is achieved, and the positive pressure repulsion of oxygen to the slice temporary storage tank and the pipelines before and after the slice temporary storage tank is maintained.

[0022] 2. The device further increases a nitrogen filter and a compressor, can continuously suck the nitrogen in the slice material bin, and after pressurization, sends the nitrogen to the nitrogen storage tank, maintains the pressure of the nitrogen storage tank in a high position, and finally sends the nitrogen to the slice temporary storage tank, not only pressurizes and delivers the slice raw materials, but also makes the nitrogen achieve complete recycling.

[0023] 3. The device further increases a control valve, the control valve can automatically adjust according to the detection value of the pressure gauge, when the pressure of the gas inlet end of the compressor is low, the control valve delivers nitrogen to it for pressurization, when the pressure before the compressor is stable or high, the nitrogen delivery amount of the control valve to the slice material bin is reduced, the internal pressure of the slice material bin is prevented from being overloaded, and the nitrogen pressure in the slice material bin is also maintained stable. BRIEF DESCRIPTION OF DRAWINGS

[0024] The present application will be further described below with reference to the embodiments and the accompanying drawings.

[0025] Figure 1 The present application is a structural schematic diagram.

[0026] In the drawings, the components represented by the numbers are listed as follows:

[0027] 1-slice temporary storage tank, 2-slice bin, 21-packaging equipment, 3-nitrogen filter, 31-compressor, 32-pressure gauge, 4-control valve, 41-outlet valve, 42-inlet valve, 5-nitrogen storage tank, 51-nitrogen delivery valve. DETAILED DESCRIPTION

[0028] Referring to Figure 1 The utility model provides a nitrogen pressure stabilizing system of slice conveying pipeline, in order to better understand the above technical scheme, the above technical scheme will be explained in detail below combining with the description and specific embodiment.

[0029] In one embodiment of the utility model technical scheme:

[0030] It includes slice temporary storage tank 1, slice bin 2, nitrogen filter 3, compressor 31, control valve 4 and nitrogen storage tank 5;

[0031] Slice temporary storage tank 1 is the closed tank body, and the feed inlet of slice temporary storage tank 1 is sealingly connected with the conveying pipeline of the front end raw material slice 6,

[0032] Slice bin 2 is the closed bin, and the discharge outlet of slice temporary storage tank 1 is sealingly connected with the feed inlet of slice bin 2, and the top of slice bin 2 is further provided with an exhaust port, a one-way valve is arranged on the exhaust port of the top of slice bin 2, and a filter screen is further arranged on the exhaust port of the top of slice bin 2, so as to avoid that the slice raw material is sucked into the nitrogen filter 3, so that the slice can naturally fall under the action of gravity.

[0033] The bottom of slice bin 2 is connected with a discharge pipeline, and the discharge pipeline of slice bin 2 is provided below with a packaging equipment 21 of raw material.

[0034] Nitrogen storage tank 5 is the closed tank body, and the front end of nitrogen storage tank 5 is provided with a nitrogen delivery valve 51, and nitrogen storage tank 5 is communicated with the external nitrogen pipeline through the nitrogen delivery valve 51;The outlet of nitrogen storage tank 5 is communicated with the feed inlet and discharge outlet pipeline of slice temporary storage tank 1 through a tee joint;

[0035] The inlet of nitrogen filter 3 is communicated with the exhaust port of the top of slice bin 2, the outlet of nitrogen filter 3 is communicated with the inlet of compressor 31, and the outlet of compressor 31 is further communicated with nitrogen storage tank 5 through a pipeline;The outlet pipeline of compressor 31 is connected at the bottom of the inner cavity of nitrogen storage tank 5, the nitrogen delivery valve 51 is connected at the top of the inner cavity of nitrogen storage tank 5, and the outlet of nitrogen storage tank 5 is also arranged at the top of the inner cavity;

[0036] And the inlet pipeline and outlet pipeline of nitrogen storage tank 5 are both horizontally arranged, and such structure can make the pressure of nitrogen storage tank 5 injected by compressor 31 not disturb the conveying direction of itself.

[0037] The pipeline through which the nitrogen delivery valve 51 delivers nitrogen can be directly connected to the front and rear ends of the slice temporary storage tank 1 through the nitrogen storage tank 5, which is convenient to use and can keep the nitrogen delivery stable.

[0038] The control valve 4 is an electric three-way valve, and the front end of the control valve 4 is connected to the nitrogen pipeline.

[0039] The first gas outlet of the control valve 4 is connected to the discharge pipeline of the slice bin 2, the second gas outlet of the control valve 4 is connected to the pipeline between the nitrogen filter 3 and the compressor 31, and a pressure gauge 32 is arranged on the pipeline of the second gas outlet of the control valve 4. The gas outlet of the nitrogen filter 3, the gas inlet of the compressor 31 and the second gas outlet of the control valve 4 are all connected to the pipeline where the pressure gauge 32 is arranged.

[0040] The first gas outlet of the control valve 4 is further provided with a gas maintenance valve 41, and the gas inlet of the control valve 4 is provided with a gas maintenance valve 42.

[0041] The gas maintenance valve 41 and the gas maintenance valve 42 are both manual gas valves and are kept in an open state, so that the nitrogen in the pipeline at the outlet of the slice bin 2 is kept under positive pressure, which can prevent the external cavity from entering the slice when the slice product is packaged, can prevent a large amount of air from mixing into the packaging bag, and can effectively ensure the product quality. At the same time, the gas maintenance valve 41 and the gas maintenance valve 42 can be closed to repair the nitrogen pipeline when an abnormality occurs, and the pipeline can be normally maintained and repaired.

[0042] It should be noted that:

[0043] 1、Control valve 4 is associated with the control of pressure gauge 32, but through the PLC controller control, pressure gauge 32 detects when the pressure is too large, pressure gauge 32 via nitrogen filter 3 and the top of the slice bin 2 pressure to keep approximately, can indirectly judge the nitrogen pressure in the slice bin 2 is also too large, at this time can adjust the control valve 4 to reduce the amount of nitrogen to the slice bin 2 delivery, to reduce the pressure in the slice bin 2 purposes; 2, when the pressure gauge 32 detects when the pressure is too small, control valve 4 immediately to the front end of the compressor 31 to deliver nitrogen, so that the intake pressure of the compressor 31 to keep stable, thereby avoiding the compressor 31 appear abnormal, effectively ensure the direction of the nitrogen storage tank 5 to deliver stable pressure, ensure that the nitrogen can be smoothly back to the nitrogen storage tank 5; 3, through the control valve 4 increases a pressure gauge 32 for detecting the pressure change in the pipeline, also connected with a nitrogen delivery route, for flexible adjustment of the nitrogen in the entire circulating pipeline to make up the position, so that the entire pipeline nitrogen pressure is maintained within the set pressure value range, so that the finished slice to achieve stable delivery, and the entire delivery pipeline to maintain the nitrogen filled to avoid air mixed in, even if the packaging equipment 21 packing speed is not stable, the nitrogen pressure in the slice bin 2 produces a large fluctuation, the system can also be coordinated through the control valve 4, so that the compressor 31 intake and the slice bin 2 outlet of the nitrogen pressure to keep stable uniform.

[0044] The nitrogen filter filters oxygen through pressure swing adsorption technology. The core working principle of the nitrogen filter is to use the adsorption characteristics of carbon molecular sieve. In the process of nitrogen generation, the compressed air is first subjected to preliminary treatment by the compressed air purification assembly to remove most of the oil, water and dust. Subsequently, the purified compressed air enters the adsorption tower containing special carbon molecular sieve, wherein O2, CO2 and H2O are adsorbed by the carbon molecular sieve, and nitrogen flows out from the outlet end of the adsorption tower. After a period of time, when the carbon molecular sieve in the adsorption tower is saturated, the compressed air will flow into another adsorption tower for adsorption to produce nitrogen, and the saturated carbon molecular sieve is regenerated, that is, it is rapidly lowered to atmospheric pressure to remove the adsorbed O2, CO2 and H2O, thereby realizing oxygen-nitrogen separation and continuously outputting nitrogen. The entire process is controlled by a programmable controller to ensure reliable and stable operation of the equipment. The device has already been a commonly used device.

[0045] In use, the utility model discloses through the nitrogen storage tank 5 of external connection nitrogen first buffering and storage, make it keep with external pipeline pressure basically flat, then the pressure of nitrogen storage tank 5 will be delivered to the import and export of slice temporary storage tank 1, ensure that the finished product in slice temporary storage tank 1 and cavity keep positive pressure isolation state, slice finished product needs to avoid exposure in the air, also should reduce the illumination, ensure its quality stability.

[0046] At this time, the pressure of the slice temporary storage tank 1 is kept in a high state, the compressor 31 sucks nitrogen from the nitrogen filter 3, and the nitrogen filter 3 also sucks nitrogen into the slice bin 2, and a filter screen is arranged at the exhaust port of the slice bin 2 to avoid the slice being sucked in, even if the fine particles are sucked in, the nitrogen filter 3 can also filter and separate the impurities.

[0047] The nitrogen filter 3 sucks nitrogen from the slice bin 2, so that the nitrogen pressure in the slice bin 2 is lower than that in the slice temporary storage tank 1, and the pressure at the front end of the slice temporary storage tank 1 is large, so that the slice in the slice temporary storage tank 1 can be continuously pushed into the slice bin 2. The bottom opening of the slice bin 2 continuously delivers the slice to the packaging device 21, and the packaging speed of the slice is unstable, so the nitrogen pressure in the slice bin 2 is also higher than the atmospheric pressure, forming a trace positive pressure, to avoid external air entering the slice bin 2.

[0048] However, because the slice in the slice bin 2 is continuously delivered downward for packaging, the internal pressure is unstable, and at the same time, the nitrogen pressure sucked by the compressor 31 is also unstable, which causes the compressor 31 to easily jump frequently, further disturbing the nitrogen pressure in the slice bin 2, and making the nitrogen pressure in the entire slice delivery pipeline more chaotic.

[0049] The control valve 4 of the device can deliver nitrogen in another external nitrogen pipeline into the system, which can enter the suction pipeline of the compressor 31 to balance the suction pressure, so that the compressor 31 works under stable pressure and is not easy to stop, and the control valve 4 can also continuously inject nitrogen into the discharge pipeline of the slice bin 2 under normal conditions, so that the internal nitrogen pressure of the slice bin 1 is not easily affected by the packaging speed, and the discharge pipeline of the slice bin 1 can also continuously deliver nitrogen downward, to avoid the nitrogen pressure at the outlet of the slice bin 1 changing due to pressure fluctuation, and further stabilize the nitrogen pressure stability of the entire slice delivery pipeline.

[0050] Although the specific embodiments of the present application are described above, those skilled in the art should understand that the specific embodiments described are only illustrative, and are not intended to limit the scope of the present application, and equivalent modifications and changes made by those skilled in the art in accordance with the spirit of the present application should be covered within the scope of the claims of the present application.

Claims

1. A nitrogen pressure stabilizing system for a slice delivery line, characterized by, The application relates to a slice temporary storage tank (1), a slice storage bin (2), a nitrogen filter (3), a compressor (31), a control valve (4) and a nitrogen storage tank (5). The slice temporary storage tank (1) is a closed tank body, the feeding port of the slice temporary storage tank (1) is sealingly connected with a front-end raw material conveying pipeline, The slice storage bin (2) is a closed bin, the discharging port of the slice temporary storage tank (1) is sealingly connected with the feeding port of the slice storage bin (2), the top of the slice storage bin (2) is further provided with a gas exhaust port, the bottom of the slice storage bin (2) is connected with a discharging pipeline, and the discharging pipeline of the slice storage bin (2) is provided below a raw material packaging device (21). The nitrogen storage tank (5) is a closed tank body, the front end of the nitrogen storage tank (5) is provided with a nitrogen conveying valve (51), the nitrogen storage tank (5) is communicated with an external nitrogen pipeline through the nitrogen conveying valve (51), the gas outlet of the nitrogen storage tank (5) is communicated with the feeding port and the discharging port pipeline of the slice temporary storage tank (1) through a three-way joint. The gas inlet of the nitrogen filter (3) is communicated with the gas exhaust port at the top of the slice storage bin (2), the gas outlet of the nitrogen filter (3) is communicated with the gas inlet of the compressor (31), and the gas outlet of the compressor (31) is further communicated with the nitrogen storage tank (5) through a pipeline. The control valve (4) is an electric three-way valve, the front end of the control valve (4) is communicated with the external nitrogen pipeline. The first gas outlet of the control valve (4) is communicated with the discharging pipeline of the slice storage bin (2), the second gas outlet of the control valve (4) is connected to the pipeline between the nitrogen filter (3) and the compressor (31), a pressure gauge (32) is further arranged on the pipeline of the second gas outlet of the control valve (4), and the gas outlet of the nitrogen filter (3), the gas inlet of the compressor (31) and the second gas outlet of the control valve (4) are all communicated with the pipeline where the pressure gauge (32) is arranged. The packaging device (21) is an automatic bagging machine.

2. A nitrogen pressure stabilizing system for a slice delivery line as defined in claim 1, characterized in that: An exhaust repair valve (41) is further arranged on the first gas outlet of the control valve (4), and an air inlet repair valve (42) is arranged on the air inlet of the control valve (4).

3. A nitrogen pressure stabilizing system for a slice delivery line as defined in claim 1, wherein: The exhaust repair valve (41) and the air inlet repair valve (42) are both manual air valves. The gas outlet pipeline of the compressor (31) is connected to the bottom of the inner cavity of the nitrogen storage tank (5), the nitrogen conveying valve (51) is connected to the top of the inner cavity of the nitrogen storage tank (5), and the gas outlet of the nitrogen storage tank (5) is also arranged at the top of the inner cavity.

4. A nitrogen pressure stabilizing system for a slice delivery line as defined in claim 1, wherein: The gas inlet pipeline and the gas outlet pipeline of the nitrogen storage tank (5) are both horizontally arranged. A one-way valve is arranged on the gas exhaust port at the top of the slice storage bin (2), and a filter screen is further arranged on the gas exhaust port at the top of the slice storage bin (2).

5. A nitrogen pressure stabilizing system for a slice delivery line as defined in claim 1, wherein: ​

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