An online detection device, production system and method for nylon 6 dry chips

Abstract

The present invention proposes an online detection device, a production system and a method for nylon 6 dry slice indicators, comprising: a first valve, a feed end of which is used to connect to a drying tower; a pipeline sight glass, a feed end of which is connected to a discharge end of the first valve through a pipeline; the pipeline sight glass is used for detection of a nylon 6 dry slice detection instrument; a first rotary discharge valve, a feed end of which is connected to a discharge end of the pipeline sight glass through a pipeline; the discharge end of the first rotary discharge valve is used to connect to a cooling silo; in the present invention, a pipeline sight glass for detection of a nylon 6 dry slice detection instrument is arranged between the drying tower and the cooling silo, so that real-time and rapid detection of dry slices in the production process is realized, and timeliness is provided for process adjustment in the production process.

Description

Technical Field

[0001] The invention belongs to the technical field of nylon 6 production, and in particular relates to an online detection device, a production system and a method for nylon 6 dry slice indicators. Background Art

[0002] Nylon 6, also known as PA6, polyamide 6, and nylon 6, is a polymer compound. In the industrial production of nylon 6, caprolactam, a ring-opening agent, and a chain-terminating agent are used to polymerize to generate a melt, which is then cooled by water and cut into slices using a granulator. The slices are then extracted from impurities, dried, and solid-phase thickened to generate dry slices. The slices in the drying tower and cooling silo during the production process are called dry slices. When the production process fluctuates, in order to produce high-quality slices, it is often necessary to test the various indicators of the dry slices so as to promptly detect changes in process indicators and make adjustments based on the indicators to achieve the goal of stabilizing product indicators and obtaining superior products.

[0003] The inventors found that in the actual production process, the time required for the conventional laboratory dry section index detection method to detect viscosity, moisture, hot water extractables, amino groups and carboxyl groups is 3 hours, 3 hours, 15 hours, 5 hours and 5 hours respectively. The detection method has a long cycle and occupies a lot of resources. In addition, after the required data is obtained, the process is adjusted according to the data indicators, which often has a lag, resulting in untimely adjustments and affecting the product quality rate. Summary of the invention

[0004] In order to solve the above problems, the present invention proposes an online detection device, production system and method for nylon 6 dry slices, which can monitor the changes of various indicators of dry slices in real time during the production process and provide timeliness for process adjustments in the production process.

[0005] In order to achieve the above-mentioned object, in a first aspect, the present invention provides an online detection device for the index of nylon 6 dry slices, which adopts the following technical scheme:

[0006] An online detection device for indicators of nylon 6 dry chips, comprising:

[0007] The first valve, the feed end is used to connect to the drying tower;

[0008] A pipeline sight glass, the feed end of which is connected to the discharge end of the first valve through a pipeline; the pipeline sight glass is used for detection of nylon 6 dry slice detection equipment;

[0009] The first rotary discharge valve, the feed end of which is connected to the discharge end of the pipeline sight glass through a pipeline; the discharge end of the first rotary discharge valve is used to connect to the cooling silo.

[0010] Furthermore, the two sides of the pipeline sight glass are respectively provided with a bottom plate and a transparent plate, and a gold-plated plate is fixed on the bottom plate.

[0011] Furthermore, a slicing layer is provided between the gold-plated plate and the transparent plate, and the irradiation direction of the detection port of the detection instrument is perpendicular to the slicing layer.

[0012] Furthermore, the detection instrument is an infrared analyzer.

[0013] Furthermore, the infrared analyzer includes a data processing system; the data processing system is configured to measure data by utilizing the different absorbances of dry slice chemical bonds with different viscosities, different water contents, different hot water extractables, different amino groups and different carboxyl groups to infrared rays of different wavelengths, and the different intensities of reflected infrared rays of different wavelengths.

[0014] In order to achieve the above object, in a second aspect, the present invention also provides a nylon 6 production system, which adopts the following technical solution:

[0015] A nylon 6 production system, comprising:

[0016] Drying tower, the feed end is connected to the extraction system;

[0017] The first valve, the feed end is used to connect to the drying tower;

[0018] A pipeline sight glass, the feed end of which is connected to the discharge end of the first valve through a pipeline; the pipeline sight glass is used for detection of nylon 6 dry slice detection equipment;

[0019] The first rotary discharge valve, the feed end of which is connected to the discharge end of the pipeline sight glass through a pipeline; the discharge end of the first rotary discharge valve is used to connect to the cooling silo.

[0020] a second valve connected in parallel with the first valve at the discharge end of the drying tower;

[0021] The second rotary discharge valve, the feed end is connected to the discharge end of the second valve, and the discharge end is connected to the feed end of the cooling silo; the second rotary discharge valve and the first rotary discharge valve are connected in parallel to the feed end of the cooling silo.

[0022] Furthermore, the two sides of the pipeline sight glass are respectively a bottom plate and a transparent plate, a gold-plated plate is fixed on the bottom plate; a slicing layer is between the gold-plated plate and the transparent plate, and the irradiation direction of the detection port of the detection instrument is perpendicular to the slicing layer.

[0023] Furthermore, the detection instrument is an infrared analyzer; the infrared analyzer includes a data processing system; the data processing system is configured to measure data by utilizing the different absorbances of dry slice chemical bonds with different viscosities, different water contents, different hot water extractables, different amino groups and different carboxyl groups to infrared rays of different wavelengths, and the different intensities of reflected infrared rays of different wavelengths.

[0024] In order to achieve the above-mentioned purpose, in a third aspect, the present invention provides an online detection method for the indexes of nylon 6 dry chips, which adopts the following technical scheme:

[0025] A method for online detection of indicators of nylon 6 dry slices adopts the online detection device for indicators of nylon 6 dry slices as described in the first aspect, comprising: utilizing the different absorbances of chemical bonds of dry slices with different viscosities, different water contents, different hot water extractables, different amino groups and different carboxyl groups to infrared rays of different wavelengths, and measuring data by using the different intensities of infrared rays of different wavelengths reflected back.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] 1. In the present invention, a pipeline sight glass for detecting nylon 6 dry slices is arranged between the drying tower and the cooling silo, so that the real-time and rapid detection of dry slices in the production process is realized, and the process adjustment in the production process is timely provided;

[0028] 2. The present invention designs a sample detection branch between the drying tower and the cooling silo, including a valve and a rotary discharge valve, which can effectively obtain dry slices with uniform flow rate and bulk density at a fixed rotation speed for detection by detection instruments to reduce errors;

[0029] 3. The detection instrument of the present invention adopts an infrared analyzer and a designed pipeline sight glass. The near side of the probe is a transparent piece made of glass lens, and the opposite lining is a gold-plated plate, which can reduce the transmittance of infrared rays and improve the accuracy of detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The drawings in the specification that constitute a part of this embodiment are used to provide a further understanding of this embodiment. The schematic embodiments of this embodiment and their descriptions are used to explain this embodiment and do not constitute improper limitations on this embodiment.

[0031] Figure 1 This is a structural view of a nylon 6 production line according to Example 1 of the present invention;

[0032] Figure 2 This is a structural front view of a pipeline sight glass according to Embodiment 1 of the present invention;

[0033] Figure 3 This is a schematic diagram of the process flow of online detection of a pipeline sight glass according to Example 1 of the present invention;

[0034] Among them, 1. Drying tower, 2. First valve, 3. Second valve, 4. Second rotary discharge valve, 5. Pipeline sight glass, 6. Infrared analyzer, 7. First rotary discharge valve, 8. Cooling silo, 9. Transparent plate, 10. Bottom plate, 11. Gold-plated plate, 12. Dry slices, 13. Extraction system, 14. Packaging workshop, 15. Data processing system. DETAILED DESCRIPTION

[0035] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0036] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.

[0037] Embodiment 1:

[0038] like Figure 1 As shown, this embodiment provides an online detection device for the indexes of nylon 6 dry chips, which is used for online detection of the indexes such as viscosity, moisture, hot water extractables, amino groups, and carboxyl groups of dry chips in nylon 6 production, including:

[0039] The first valve 2, the feed end is used to connect the drying tower 1. It can be understood that the discharge port of the drying tower 1 is connected to the feed port of the first valve 2 through a pipeline. The first valve 2 can be a hand valve;

[0040] A pipeline sight glass 5, the feed end of which is connected to the discharge end of the first valve 2 through a pipeline; the pipeline sight glass 5 is used for detection of a nylon 6 dry slice detection instrument;

[0041] The first rotary discharge valve 7, the feed end is connected to the discharge end of the pipeline sight glass 5 through a pipeline; the discharge end of the first rotary discharge valve 7 is used to connect to the cooling silo 8. It can be understood that the feed port of the cooling silo 8 is connected to the discharge port of the first rotary discharge valve 7 through a pipeline.

[0042] In this embodiment, the two sides of the pipeline sight glass 5 are respectively a bottom plate 10 and a transparent plate 9, and a gold-plated plate 11 is fixed on the bottom plate 10; the bottom plate 10 can be a stainless steel bottom plate, and the transparent plate 9 can be set as a glass sight glass; it can be understood that in this embodiment, the two ends of the bottom plate 10 and the transparent plate 9 can be fixed at the edge of the pipeline, and the channel between the bottom plate 10 and the transparent plate 9 is a dry section channel. In other embodiments, it can also be achieved by other conventional means; the near side of the probe of the detection instrument is the transparent plate 9, and the opposite lining is the gold-plated plate 11.

[0043] In this embodiment, a slice layer is provided between the gold-plated plate 11 and the transparent plate 9, and the irradiation direction of the detection port of the detection instrument is perpendicular to the slice layer. It can be understood that the slice layer is a plurality of falling dry slices.

[0044] In this embodiment, the detection instrument is an infrared analyzer 6, and the infrared analyzer 6 at least includes a data processing system 15; the data processing system 15 is configured to: use the different absorbances of dry slice chemical bonds with different viscosities, different moisture content, different hot water extractables, different amino groups and different carboxyl groups to infrared rays of different wavelengths, and the different intensities of reflected infrared rays of different wavelengths to measure data; in the early stage, the detection data of conventional slice indicators such as viscosity, moisture content, hot water extractables, amino groups, carboxyl groups, etc. provided by the laboratory can be used to establish a data model of different indicators and infrared absorbances of different wavelengths. The establishment of the data model can use a deep learning network, and the absorbances of infrared rays of different wavelengths corresponding to the chemical bonds of dry slices with viscosity, different moisture content, different hot water extractables, different amino groups and different carboxyl groups are used as inputs, and the viscosity, moisture content, hot water extractables, amino groups and carboxyl groups under different infrared wavelengths are output; other conventional data model establishment methods can also be used, which will not be described in detail here.

[0045] Embodiment 2:

[0046] This embodiment provides a nylon 6 production system, comprising:

[0047] The feeding end of the drying tower 1 is connected to the extraction system 13; the wet slices enter the drying tower 1 and become dry slices after being dried and dehydrated;

[0048] The first valve 2, the feed end is used to connect to the drying tower 1;

[0049] A pipeline sight glass 5, the feed end of which is connected to the discharge end of the first valve 2 through a pipeline; the pipeline sight glass 5 is used for detection of a nylon 6 dry slice detection instrument;

[0050] The first rotary discharge valve 7 has a feed end connected to the discharge end of the pipeline sight glass 5 through a pipeline; the discharge end of the first rotary discharge valve 7 is used to connect to the cooling silo 8.

[0051] A second valve 3, connected in parallel with the first valve 2 at the discharge end of the drying tower 1;

[0052] The second rotary discharge valve 4 has a feed end connected to the discharge end of the second valve 3, and a discharge end connected to the feed end of the cooling bin 8; the second rotary discharge valve 4 is connected to the feed end of the cooling bin in parallel with the first rotary discharge valve 7. The first rotary discharge valve 7 and the second rotary discharge valve 4 adjust the rotation speed according to the load and material level requirements.

[0053] Other systems, devices and components included in the nylon 6 production system (such as the extraction system 13 and the packaging workshop 14, etc.) are conventional settings and do not involve the innovation of the present invention, and will not be described in detail here.

[0054] The components or equipment such as the first valve 2, the pipeline sight glass 5, the detection instrument and the first rotary discharge valve 7 in this embodiment have all the characteristics of the corresponding components or equipment in Example 1.

[0055] The working principle or process of this embodiment is as follows:

[0056] like Figure 1 As shown, the wet slices of the extraction system 13 enter the drying tower 1, pass through the second valve 3, and most of the dry slices enter the second rotary discharge valve 4. The operator adjusts the speed of the second rotary discharge valve 4 according to the production load and the material level control requirements of the drying tower, and sends the dry slices into the cooling silo 8;

[0057] The wet slices from the extraction system 13 enter the drying tower 1, and some of the dry slices enter the pipeline sight glass 5 through the first valve; the rotation speed of the first rotary discharge valve 7 is fixed to keep the flow rate and stacking density of the dry slices in the pipeline sight glass 5 uniform;

[0058] The detection port of the infrared analyzer 6 irradiates the slice layer in the pipeline sight glass 5; the data is measured by using the different absorbances of the chemical bonds of the dry slices with different viscosities, different water contents, different hot water extractables, different amino groups, and different carboxyl groups to infrared rays of different wavelengths, and the different intensities of the reflected infrared rays of different wavelengths;

[0059] The dried slices pass through the first rotary discharge valve 7 and enter the cooling bin 8;

[0060] Repeat the above steps to obtain continuous dry slice viscosity, moisture, hot water extractables, amino groups, carboxyl groups and other index data.

[0061] Embodiment 3:

[0062] The present embodiment provides an online detection method for the indicators of nylon 6 dry slices, which adopts the online detection device for the indicators of nylon 6 dry slices as described in Example 1, including: utilizing the different absorbances of chemical bonds of dry slices with different viscosities, different water contents, different hot water extractables, different amino groups and different carboxyl groups to infrared rays of different wavelengths, and measuring data by using the different intensities of infrared rays of different wavelengths reflected back.

[0063] The above description is only a preferred embodiment of the present embodiment and is not intended to limit the present embodiment. For those skilled in the art, the present embodiment may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present embodiment shall be included in the protection scope of the present embodiment.

Claims

1. An online detection device for the index of nylon 6 dry slices, characterized in that: include: The first valve, the feed end is used to connect to the drying tower; A pipeline sight glass, the feed end of which is connected to the discharge end of the first valve through a pipeline; the pipeline sight glass is used for detection of a nylon 6 dry slice detection instrument; A first rotary discharge valve, the feed end of which is connected to the discharge end of the pipeline sight glass through a pipeline; the discharge end of the first rotary discharge valve is used to connect to the cooling silo; A detection branch for nylon 6 dry chips is designed between the drying tower and the cooling silo, and the detection branch includes a first valve and a first rotary discharge valve; The two sides of the pipeline sight glass are respectively a bottom plate and a transparent plate, and a gold-plated plate is fixed on the bottom plate; A slice layer is provided between the gold-plated plate and the transparent plate, and the irradiation direction of the detection port of the detection instrument is perpendicular to the slice layer; The detection instrument is an infrared analyzer; the wet slices of the extraction system enter the drying tower, pass through the first valve, and some dry slices enter the pipeline sight glass; the rotation speed of the first rotary discharge valve is fixed to keep the flow rate and stacking density of the dry slices in the pipeline sight glass uniform; the infrared analyzer detection port irradiates the slice layer in the pipeline sight glass; The infrared analyzer includes a data processing system; the data processing system is configured to: determine data by utilizing the different absorbances of chemical bonds of dry slices with different viscosities, different water contents, different hot water extractables, different amino groups and different carboxyl groups to infrared rays of different wavelengths, and the different intensities of infrared rays of different wavelengths reflected back; and establish a data model of different indicators and absorbances of infrared rays of different wavelengths using the detection data of conventional slice indicators such as viscosity, water content, hot water extractables, amino groups and carboxyl groups provided by the laboratory.

2. A nylon 6 production system, characterized in that: It comprises the on-line detection device for indicators of nylon 6 dry chips as claimed in claim 1.

3. A nylon 6 production system as claimed in claim 2, characterized in that: Also includes: a second valve connected in parallel with the first valve at the discharge end of the drying tower; The second rotary discharge valve, the feed end is connected to the discharge end of the second valve, and the discharge end is connected to the feed end of the cooling silo; the second rotary discharge valve and the first rotary discharge valve are connected in parallel to the feed end of the cooling silo.

4. A method for online detection of indicators of nylon 6 dry slices, characterized in that: The on-line detection device for the index of nylon 6 dry slices as claimed in claim 1 is used, including: utilizing the different absorbances of chemical bonds of dry slices with different viscosities, different water contents, different hot water extractables, different amino groups and different carboxyl groups to infrared rays of different wavelengths, and measuring data by using the different intensities of infrared rays of different wavelengths reflected back.

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