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CN-121994733-A - Indigo dye concentration on-line measuring equipment based on spectral variation

CN121994733ACN 121994733 ACN121994733 ACN 121994733ACN-121994733-A

Abstract

The invention discloses an indigo dye concentration on-line detection device based on spectral change, relates to the technical field of dye concentration detection, and solves the problems of lag, large manual error, no closed-loop control and the like in the existing off-line detection. The device comprises a box body, a sampling device, a filtering device, a spectrum detection device, a display control assembly, a cleaning mechanism and a dye flow regulating assembly, wherein the inside of the box body is provided with a detection area and a control area, the sampling device is used for collecting dye liquor from a pulp dyeing combination machine, the dye liquor enters a detection tank after secondary filtering, the spectrum detection device is combined with a plurality of sensors to collect spectrum signals, a controller is used for calculating real-time concentration through an algorithm, the flow regulating assembly can be linked to realize automatic dye feeding, the dye liquor after detection can be recycled, and the cleaning mechanism can automatically clean the detection tank. The device has high detection precision and strong interference resistance, realizes the online continuous detection and closed-loop control of the concentration of the indigo dye, is suitable for continuous production of a sizing and dyeing combination machine, reduces labor cost and dye waste, and improves the quality of printing and dyeing products.

Inventors

  • XUE GUIPING
  • CHEN WENZHEN
  • WEN SHUIPING
  • QIN CHUNYING

Assignees

  • 广东职业技术学院

Dates

Publication Date
20260508
Application Date
20260317

Claims (10)

  1. 1. The indigo dye concentration on-line detection equipment based on spectral change is characterized by comprising a box body (1), a sampling mechanism, a filtering mechanism, a spectral detection mechanism and a display control assembly, wherein the back of the box body (1) is provided with a detachable heat dissipation plate, a vertically arranged partition plate (13) is arranged in the box body to divide the inner part of the box body (1) into a detection area and a control area, and the filtering mechanism and the spectral detection mechanism are arranged in the detection area; The sampling mechanism comprises a sampling pump (2) and a sampling tube (6), wherein the sampling pump (2) is arranged at the top of the box body (1), one end of the sampling tube (6) is connected with the input end of the sampling pump (2), the other end of the sampling tube is communicated with a dye liquor circulating pipeline of the pulp dyeing combination machine, and the output end of the sampling pump (2) is provided with a first connecting pipe (24) connected with the filtering mechanism; The spectrum detection mechanism comprises a spectrum detector (28), a light source generator (21), a detection tank (18) and a signal conditioning module, wherein the filtering mechanism is provided with a connecting pipe III (26) which is communicated with the inside of the detection tank (18), the spectrum detector (28) and the light source generator (21) are arranged on two opposite sides of the detection tank (18), the detection tank (18) is provided with a water outlet (20) and a water outlet (22) penetrating through the side surface of the box body (1), the water outlet (20) is provided with an electric control valve II (19), the light source generator (21) is used for emitting detection light with specific wavelength, the spectrum detector (28) is used for capturing absorption spectrum signals of detection light by dye liquor, and the signal conditioning module is used for processing electric signals output by the spectrum detector (28); the display control assembly comprises a controller (14), a data storage module (27), a signal transmission module, a display screen (3) and a key control area (4), wherein the display screen (3) and the key control area (4) are arranged on the front surface of the box body (1), the key control area (4) is provided with a plurality of multifunctional keys, a concentration calculation algorithm is built in the controller (14) and used for analyzing and processing spectrum signals and calculating real-time concentration of indigo dye, the data storage module (27) is used for storing detection data and equipment parameters, and the signal transmission module is used for realizing data transmission.
  2. 2. The online detection device for indigo dye concentration based on spectral variation according to claim 1, wherein the filtering mechanism comprises a first filter (15), the first filter (15) comprises a sealing cover (153), an upper shell (151) and a lower shell (152), the sealing cover (153) is in threaded sealing connection with the top of the upper shell (151), the bottom of the upper shell (151) is in threaded sealing connection with the top of the lower shell (152), limiting rings (156) are arranged on the inner walls of the upper shell (151) and the lower shell (152), a plurality of limiting holes (157) are formed in the limiting rings (156), a first filter screen (154) and a second filter screen (155) are respectively arranged in the upper shell (151) and the lower shell (152), limiting columns (158) are arranged at the bottoms of the edges of the first filter screen (154) and the second filter screen (155), the first filter screen (154) and the second filter screen (155) are inserted into the limiting holes (157) close to the limiting rings (156) through the limiting columns, a first liquid inlet (1510) is formed in the top of the sealing cover (153), a first liquid inlet (1510) is formed in the bottom of the first shell (152) and a first liquid inlet (24) is connected with a first liquid inlet (24), the first liquid outlet is provided with a second connecting pipe (25) which is connected with a third connecting pipe (26), and the outer surface of the upper shell (151) is provided with a limiting convex ring body (159).
  3. 3. The indigo dye concentration online detection device based on spectral change according to claim 2, wherein the filtering mechanism further comprises a second filter (16), the second filter (16) is a ceramic filter core, the second filter (16) is provided with a liquid inlet and a liquid outlet, one end of a second connecting pipe (25) is connected with the liquid outlet, the other end of the second connecting pipe is connected with the liquid inlet, one end of a third connecting pipe (26) is connected with the liquid outlet, the other end of the third connecting pipe is connected with the detection tank (18), a fixing clamp (29) is arranged on the inner side wall of the box body (1), and the fixing clamp (29) is used for fixedly placing the first filter (15) and the second filter (16).
  4. 4. The device for online detection of indigo dye concentration based on spectral variation according to claim 3, wherein the first filter screen (154) and the second filter screen (155) are stainless steel filter screens, the pore diameter of the first filter screen (154) is 50-100 meshes, the pore diameter of the second filter screen (155) is 20-60 meshes, and the filtering precision of the second filter (16) is 1-5 μm.
  5. 5. The indigo dye concentration online detection device based on spectral change according to claim 1, wherein the detection tank (18) comprises a body (181) and a cover body (182), the body (181) is hollow and is provided with an opening at the top, the cover body (182) is detachably arranged at the top of the body (181), detection windows (183) are arranged on opposite sides of the detection tank (18), transparent glass (184) is arranged in the detection windows (183), sealing gaskets are arranged at the joints of the transparent glass (184) and the detection windows (183), the spectral detector (28) and the light source generator (21) are respectively arranged on two opposite sides of the detection tank (18) and are close to the detection windows (183) and correspond to the detection windows (183), the cover body (182) is provided with a through pipeline interface III (186), the pipeline interface III (186) is connected with a connecting pipe III (26), and a temperature sensor, a liquid level sensor and a gas pressure sensor are arranged in the body (181).
  6. 6. The indigo dye concentration online detection device based on spectral variation according to claim 5 is characterized by further comprising a cleaning mechanism, wherein the cleaning mechanism comprises a cleaning liquid tank, a cleaning pump and an annular pipeline (187), the annular pipeline (187) is arranged at the bottom of a cover body (182), a plurality of flushing nozzles (188) are arranged at intervals at the bottom of the annular pipeline (187), a pipeline interface II (185) is arranged on the cover body (182), the bottom end of the pipeline interface II (185) is connected with the annular pipeline (187), a water purifying pipe (23) is arranged at the top end of the pipeline interface II (185), a pipeline interface I (11) is arranged on the side face of the box body (1), one end of the pipeline interface I (11) in the box body (1) is connected with one end of the water purifying pipe (23), a pipe cleaning liquid (7) is arranged at one end outside the box body (1), the cleaning pump is connected with the cleaning pump through the pipe (7), the cleaning pump is arranged in the cleaning liquid tank, and an electric control valve I (17) is arranged on the water purifying pipe (23).
  7. 7. The indigo dye concentration on-line detection device based on spectral change according to claim 6, wherein the drain pipe (22) penetrates through the box body (1) and is provided with a three-way valve (5), the other two ports of the three-way valve (5) are respectively provided with a return pipe (8) and a drain pipe (9), and the other end of the return pipe (8) is communicated with a dye liquor circulation pipeline of the pulp dyeing combination machine.
  8. 8. The indigo dye concentration on-line detection device based on spectral variation according to claim 1, further comprising a dye flow regulating assembly, wherein the dye flow regulating assembly comprises a dye storage tank, a dye replenishing pipe, a flow regulating valve, a flow sensor and a replenishing pump, one end of the dye replenishing pipe is connected with the dye storage tank, the other end of the dye replenishing pipe is communicated with a dye liquor circulating pipe of the size dyeing combination machine, the flow regulating valve, the flow sensor and the replenishing pump are all arranged on the dye replenishing pipe, and the flow regulating valve, the flow sensor and the replenishing pump are all electrically connected with a controller (14).
  9. 9. The indigo dye concentration online detection device based on the spectral change is characterized in that a xenon lamp or an LED light source is adopted as the light source generator (21), a PLC (programmable logic controller) is adopted as the controller (14), an SD (secure digital) card or a solid state disk is adopted as the data storage module (27), an electromagnetic flowmeter is adopted as the flow sensor, a stainless steel material is adopted as the box body (1) for carrying out corrosion prevention treatment on the surface, an RS485, ethernet or WiFi transmission mode is supported by the signal transmission module, a corrosion-resistant peristaltic pump is adopted as the sampling pump (2), a corrosion-resistant centrifugal pump is adopted as the supply pump, and the device has a rotation speed adjustable function.
  10. 10. The indigo dye concentration on-line detection device based on spectral variation according to claim 1, wherein a dust screen (30) is arranged on one side of the heat dissipation back plate (12) located inside the box body (1).

Description

Indigo dye concentration on-line measuring equipment based on spectral variation Technical Field The invention relates to the technical field of dye concentration detection, in particular to an indigo dye concentration on-line detection device based on spectral change. Background Indigo dye is a natural or synthetic dye with wide application, and plays an important role in textile dyeing industry (especially jean dyeing) by virtue of unique blue color, and is also applied to the dyeing process in the fields of chemical industry, food, medicine and the like. The indigo dye is insoluble in water, and in the production process of textile printing and dyeing, the indigo dye needs to be reduced into a water-soluble leuco form by a reducing agent (such as sodium dithionite) to carry out dyeing operation, the concentration of the leuco in the dyeing process directly determines the color depth, uniformity and dyeing fastness of dyed fabrics, and the content of oxidized indigo influences the dyeing stability and the wastewater treatment efficiency. Therefore, the concentration of the oxidation state and the reduction state in the indigo dye solution is accurately detected in real time, and the method has important significance in guaranteeing production quality, reducing production cost and reducing wastewater discharge. In the jean printing and dyeing industry, the pulp dyeing combination machine is core equipment for realizing continuous dyeing and sizing of jean yarns, adopts a continuous long car production mode, has the characteristics of high production efficiency and high productivity, and is key equipment for large-scale jean production. The indigo dye is used as a core raw material for jean dyeing, the concentration stability of the indigo dye directly determines the dyeing uniformity and chromatic light consistency of jean yarns and subsequent fabrics, once the concentration of the dye fluctuates, quality defects such as chromatic aberration and color patterns of jean products can be caused, the product qualification rate is affected, and the dye waste and the production cost are increased. At present, in the production process of a sizing and dyeing combination machine, an off-line detection mode is mainly adopted for detecting the concentration of the indigo dye, namely an operator periodically samples from a dye liquor circulation system, laboratory detection is carried out through equipment such as a spectrophotometer, and then the dye replenishment flow is manually adjusted according to a detection result. The method has obvious defects that firstly, the detection has hysteresis, the offline sampling, detection and analysis processes require a certain time, the pulp dyeing combination machine is continuously long-vehicle production, the dye liquor concentration can be greatly changed during the period, the adjustment is not timely, batch quality problems are caused, secondly, the manual operation error is large, the representativeness of the sampling, the standardization of the detection process and the accuracy of the manual adjustment flow are all dependent on the experience of operators, the manual error is easy to occur, thirdly, the labor intensity is high, the operators are required to frequently sample, detect and adjust in the continuous production process, the labor cost is increased, the continuous production rhythm of the pulp dyeing combination machine is difficult to realize continuous monitoring, and fourthly, the traditional offline detection mode cannot be matched with the continuous production rhythm of the pulp dyeing combination machine, the closed-loop control of the dye concentration is not realized, and the refinement requirement of high-quality jean production is difficult to meet. Disclosure of Invention The invention aims to provide an on-line indigo dye concentration detection device based on spectral change, which can be suitable for continuous long vehicle production of a size dyeing combination machine, has high detection precision and strong anti-interference capability, and can be used for adjusting dye flow in a linkage manner, so that the key point of the pain point of the current jean dyeing industry is solved. The technical aim of the invention is realized by the following technical scheme that the indigo dye concentration on-line detection equipment based on spectral change comprises a box body, a sampling mechanism, a filtering mechanism, a spectral detection mechanism and a display control assembly, wherein the back of the box body is provided with a detachable radiating plate, the inside of the box body is provided with a vertically arranged partition board for dividing the inside of the box body into a detection area and a control area, and the filtering mechanism and the spectral detection mechanism are arranged in the detection area; The sampling mechanism comprises a sampling pump and a sampling tube, wherein the sampling pump is arranged at the top of the bo