Liquid-saving type cloth dyeing device

Abstract

The utility model discloses a liquid-saving type cloth dyeing device. Comprising a dyeing tank, a pre-liquid-removal guide plate arranged at the cloth outlet end of the dyeing tank, an extrusion roller set arranged behind the pre-liquid-removal guide plate, an auxiliary dye recovery device arranged behind the extrusion roller set and a dye collection system arranged below the extrusion roller set and the auxiliary dye recovery device. Wherein the pre-liquid-removing guide plate is provided with a guide slope inclining towards the interior of the dyeing tank, and the extrusion roller set comprises an upper extrusion roller, a lower extrusion roller and an extrusion pressure adjusting mechanism. According to the liquid-saving type cloth dyeing device, through a three-stage dye recovery system formed by the pre-dewatering guide plate, the extrusion roller set and the auxiliary dye recovery device, stepped recovery of dye liquor carried by cloth is achieved, and meanwhile the extrusion pressure adjusting mechanism can accurately adjust the extrusion force according to different cloth characteristics; the problems that a traditional dyeing device is serious in dye loss, incomplete in recovery and inaccurate in extrusion control are effectively solved.

Description

Technical Field

[0001] This utility model relates to the technical field of textile dyeing equipment, and in particular to a liquid-saving fabric dyeing device. Background Technology

[0002] Fabric dyeing, a crucial process in the textile industry, directly impacts product quality, production costs, and environmental protection. In traditional fabric dyeing, the fabric is fully immersed in dyeing solution in a dyeing tank to achieve color, and then guided by rollers for further processing. To ensure optimal dyeing results, the dyeing solution typically needs to maintain a specific concentration and temperature, making the dye cost a significant portion of the overall production cost. With increasingly stringent environmental regulations and rising raw material costs, improving dye utilization efficiency and reducing waste have become critical directions for the development of dyeing equipment technology.

[0003] In existing fabric dyeing technologies, when fabric is drawn from the dyeing tank, due to the porosity and capillary action of the fabric fibers, a large amount of dye liquor is carried on its surface and in the interfiber spaces. Only a portion of this carried dye liquor is actually absorbed by the fabric fibers to form effective color, while a significant portion of the free dye liquor that is not absorbed by the fibers is lost during subsequent pressing and drying processes, resulting in serious dye waste. Although some existing dyeing devices are equipped with simple pressing rollers or diversion devices to recover some of the dye liquor, this traditional recovery method has the following technical problems:

[0004] The extrusion effect is poor and lacks precise control. Traditional extrusion devices typically use fixed pressure or simple elastic pressure systems, which cannot precisely adjust the pressure according to the characteristics of fabrics with different thicknesses and materials. This results in low dye recovery rates when extrusion is insufficient, while excessive extrusion may damage fabric fibers and affect product quality. Furthermore, recovery is not thorough enough. Existing devices often only recover most of the extruded dye liquor, lacking effective means to recover the trace amounts of dye liquor remaining on the fabric surface after extrusion. These seemingly small amounts of dye liquor accumulate in large-scale production, causing considerable waste. Therefore, how to achieve multi-stage dye recovery through reasonable structural design, how to precisely control the extrusion pressure to adapt to the processing needs of different fabrics, and how to maximize the recovery of residual dye liquor on the fabric surface are urgent technical problems to be solved in the current fabric dyeing equipment field. Utility Model Content

[0005] To address the technical problems of existing fabric dyeing devices, such as severe dye loss, incomplete recovery, poor squeezing effect and lack of precise control, and imperfect recovery of residual dye liquor, this paper provides a liquid-saving fabric dyeing device that can achieve multi-stage dye recovery, significantly reduce dye waste, and improve dye utilization.

[0006] The technical solution adopted by this utility model to solve its technical problem is: a liquid-saving fabric dyeing device, comprising: a dyeing tank; a pre-drying guide plate, which is set at the fabric outlet end of the dyeing tank, and the pre-drying guide plate is provided with a guide slope inclined towards the inside of the dyeing tank; a squeezing roller group, which is set on the fabric travel path after the pre-drying guide plate; an auxiliary dye recovery device, which is set on the fabric travel path after the squeezing roller group; and a dye collection system, which is set below the squeezing roller group and the auxiliary dye recovery device.

[0007] Preferably, the extrusion roller assembly includes an upper extrusion roller and a lower extrusion roller, and also includes an extrusion pressure adjustment mechanism connected to the upper extrusion roller, wherein the position of the upper extrusion roller relative to the lower extrusion roller is adjusted by the extrusion pressure adjustment mechanism.

[0008] Preferably, the auxiliary dye recovery device includes an elastic scraper, the scraping edge of which is in contact with the fabric surface.

[0009] Preferably, the auxiliary dye recovery device further includes a negative pressure suction port, which is connected to a negative pressure source.

[0010] Preferably, the dye collection system includes a dye collection tray and a dye recovery tank, wherein the dye recovery tank is connected to the dye collection tray via a conveying pipe.

[0011] Preferably, a filter device is installed on the conveying pipeline, and the dye recovery tank is connected to the dyeing tank through the liquid delivery pipe to form a dye liquid circulation loop.

[0012] Preferably, the dyeing tank is equipped with a heating device for controlling the temperature of the dyeing solution.

[0013] The beneficial effects that this utility model can achieve include the following:

[0014] 1. By setting a pre-dehydration guide plate with an inclined guide slope at the fabric outlet of the dyeing tank, followed by a group of extrusion rollers and an auxiliary dye recovery device, and a dye collection system below, a multi-stage dye recovery system of "primary recovery - main recovery - final recovery" is formed. This realizes the stepwise recovery of dyes from the fabric leaving the dyeing tank to entering the subsequent process, effectively solving the problems of incomplete dye recovery and large loss of free dye liquor, and significantly improving the dye recovery rate and utilization efficiency.

[0015] 2. By setting up a squeezing roller group including an upper squeezing roller, a lower squeezing roller, and a squeezing pressure adjustment mechanism, a squeezing dehydration system with precise pressure adjustment is formed. This enables precise adjustment and optimized control of squeezing pressure according to the characteristics of fabrics with different thicknesses and materials, effectively solving the problems of poor squeezing effect and lack of precise control. It maximizes the efficiency of dye liquor extrusion while ensuring that the fabric quality is not damaged. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the liquid-saving fabric dyeing device in Example 1.

[0017] Reference numerals: 1. Frame; 2. Dyeing tank; 3. Guide roller; 4. Pre-drying guide plate; 5. Upper squeeze roller; 6. Lower squeeze roller; 7. Lead screw; 8. Handwheel; 9. Elastic scraper; 10. Negative pressure suction port; 11. Negative pressure fan; 12. Discharge pipe; 13. Dye collection tray; 14. Dye recovery tank; 15. Conveying pipe; 16. Filter screen; 17. Infusion pipe; 18. Heating pipe; 19. Fabric. Detailed Implementation

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments, but these specific embodiments do not limit the scope of protection of the present invention in any way. Example

[0019] See Figure 1 A liquid-saving fabric dyeing device includes a frame 1 and dyeing tank 2, guide roller 3, pre-drying guide plate 4, extrusion roller group, auxiliary dye recovery device, and dye collection system respectively disposed on the frame 1. This dyeing device is mainly used for continuous dyeing of fabric 19, and can significantly reduce dye loss and improve dye utilization through multi-stage recovery.

[0020] The dyeing tank 2 is fixedly mounted on the frame 1 and is used to hold the dyeing solution. The dyeing tank 2 is made of stainless steel, which is corrosion-resistant, and has a drain port at the bottom. A liquid level indicator line is provided on one side of the dyeing tank 2 to facilitate operators to monitor the liquid level of the dyeing solution.

[0021] Multiple guide rollers 3 are arranged inside the dyeing tank 2, including at least two guide rollers 3 located below the dyeing tank 2 and one guide roller 3 located above the dyeing tank 2, for guiding the fabric 19 to be fully immersed in the dyeing solution. The guide rollers 3 are mounted on supports on both sides of the dyeing tank 2 by bearings and can rotate freely. When the fabric 19 passes through, the guide rollers 3 will rotate accordingly to ensure that the fabric 19 can pass through smoothly and fully contact the dyeing solution.

[0022] A pre-dyeing guide plate 4 is fixedly installed at one end of the fabric 19 outlet of the dyeing tank 2, positioned above the dyeing liquor surface and before the subsequent extrusion rollers. The pre-dyeing guide plate 4 has a guide slope inclined inwards into the dyeing tank 2. The preferred inclination angle of the guide slope is 20-30°, which ensures effective dye liquor return without affecting the smooth flow of the fabric 19. In this embodiment, a 25° inclination is chosen. By setting the inclination angle to 25°, the fabric 19 leaving the dyeing liquor surface can be effectively supported and guided. As the fabric 19 moves upwards along the guide slope, some of the free dye liquor adhering to the surface of the fabric 19 will flow naturally back into the dyeing tank 2 under gravity, achieving preliminary dye recovery. The pre-dyeing guide plate 4 is made of stainless steel, with a smooth surface, facilitating the smooth return of the dye liquor.

[0023] The extrusion roller assembly is positioned on the fabric 19's travel path after the pre-drying guide plate 4, and includes an upper extrusion roller 5 and a lower extrusion roller 6. As the fabric 19 passes between the two extrusion rollers, it is subjected to strong extrusion, squeezing out most of the dye liquor carried in the fiber gaps. Both the upper extrusion roller 5 and the lower extrusion roller 6 are covered with a polyurethane material layer to provide sufficient extrusion pressure while preventing damage to the fabric 19. The lower extrusion roller 6 is driven by a drive motor to provide forward propulsion for the fabric 19, ensuring that the fabric 19 can continuously and stably pass through the entire dyeing apparatus.

[0024] The precision pressure adjustment mechanism is connected to the upper extrusion roller 5 and adopts a screw 7 and nut adjustment device structure that drives the handwheel 8. This mechanism includes components such as the screw 7, nut, handwheel 8, and support frame. When the operator rotates the handwheel 8, the screw 7 begins to rotate, changing the vertical position of the upper extrusion roller 5 relative to the lower extrusion roller 6 through the raising and lowering action of the nut. This precisely adjusts the pressure applied to the fabric 19 passing between the two rollers. The precision adjustment mechanism can optimize the adjustment according to the characteristics of fabrics 19 with different thicknesses and materials, ensuring the best dehydration effect without damaging the fabric 19.

[0025] An auxiliary dye recovery device is installed on the fabric 19's travel path after the extrusion rollers to recover trace amounts of dye liquor remaining on the fabric 19 after extrusion. This device includes two recovery structures: an elastic scraper 9 and a negative pressure suction port 10. The elastic scraper 9 and the negative pressure suction port 10 are mounted on the frame 1. The scraper's edge elastically adheres to the surface of the fabric 19 leaving the extrusion rollers, gently scraping away residual liquid droplets. The droplets drip downwards along the scraper's surface. The negative pressure suction port 10 is connected to a negative pressure fan 11 via a hose, its opening facing the surface of the fabric 19 leaving the extrusion rollers. The negative pressure suction removes even smaller amounts of dye liquor from the fabric 19's surface and fiber gaps, and discharges it into the dye collection tray 13 through the discharge pipe 12. Both recovery methods can be used individually or simultaneously to achieve a dual recovery effect. (The bottom of the scraper...)

[0026] The dye collection system includes two main components: a dye collection tray 13 and a dye recovery tank 14. The dye collection tray 13 is located directly below the extrusion roller assembly and auxiliary dye recovery device. It is used to collect the dye liquor squeezed out, scraped, or sucked from the fabric 19. The collection tray is made of stainless steel and has a certain inclination angle at the bottom to facilitate the flow of the dye liquor to the outlet. The dye recovery tank 14 is connected to the dye collection tray 13 through a conveying pipe 15 and is used to store the recovered dye liquor.

[0027] The dye recovery tank 14 is also made of stainless steel and has sufficient capacity to store the recovered dye liquor. A removable filter screen 16 is installed at the inlet of the conveying pipe 15. The filter screen 16 is typically 80-120 mesh; in this embodiment, the mesh size is 100 mesh. This is used to filter out lint, impurities, and other contaminants from the dye liquor, effectively filtering impurities without causing blockage in the dye liquor flow, ensuring the cleanliness of the recovered dye liquor. The filter screen 16 is made of stainless steel wire mesh, making it easy to clean and replace. The dye recovery tank 14 is positioned higher than the bottom of the dyeing tank 2. The bottom of the dye recovery tank 14 is connected to the bottom of the dyeing tank 2 via an inclined infusion pipe 17, allowing the recovered dye to be continuously conveyed into the dyeing tank 2.

[0028] The dyeing tank 2 is also equipped with an electric heating device, including heating tubes 18 and a temperature controller. The heating tubes 18 are made of corrosion-resistant stainless steel and are evenly distributed at the bottom of the dyeing tank 2, enabling rapid and uniform heating of the dyeing solution. The temperature controller is mounted on the frame 1 and connected to the electric heating device and an external PLC, enabling precise control of the dyeing solution temperature to ensure that the dyeing process is carried out under the most suitable temperature conditions, thereby improving dyeing efficiency and quality.

[0029] The working principle and method of the above-mentioned liquid-saving fabric dyeing device are as follows:

[0030] The first step involves the operator adding an appropriate amount of dyeing solution to the dyeing tank 2 and heating the solution to the required dyeing temperature using a heating device. Simultaneously, based on the thickness and material characteristics of the fabric 19 to be treated, the pressure of the upper extrusion roller 5 is adjusted using a precision extrusion pressure adjustment mechanism to ensure optimal dyeing solution extrusion without damaging the fabric 19.

[0031] The second step is to start the drive motor, causing the lower extrusion roller 6 to rotate. The fabric 19 to be dyed is fed into the dyeing tank 2 from the inlet end. Under the guidance of the guide roller 3, the fabric 19 is fully immersed in the dyeing solution to achieve uniform coloring. The guide roller 3 ensures that the fabric 19 is completely submerged in the dyeing solution to obtain a sufficient dyeing effect.

[0032] In the third step, the dyed fabric 19 is moved forward by the traction force of the lower extrusion roller 6, first passing through the pre-drying guide plate 4 set at the outlet of the dyeing tank 2. Since the guide plate has a guide slope that slopes inward into the dyeing tank 2, some of the free dye liquor carried on the surface of the fabric 19 that has not been adsorbed by the fibers will flow back into the dyeing tank 2 under the action of gravity, realizing the first-stage dye recovery and significantly reducing the processing load of subsequent processes.

[0033] In the fourth step, the pre-dehydrated fabric 19 enters the extrusion roller group. When the fabric 19 passes between the upper and lower extrusion rollers, it is subjected to a powerful extrusion force that is precisely controlled. Most of the dye liquor carried in the fiber pores of the fabric 19 is effectively squeezed out, and the squeezed-out dye liquor immediately falls into the dye collection tray 13 below.

[0034] In the fifth step, the fabric 19 leaving the extrusion roller assembly then passes through the auxiliary dye recovery device. The elastic scraper 9 gently scrapes away the remaining liquid droplets on the surface of the fabric 19, while the negative pressure suction port 10 uses suction to draw away even smaller amounts of dye from the surface of the fabric 19 and the gaps between the fibers.

[0035] In the sixth step, all the dye liquor separated during the extrusion and auxiliary recycling processes is collected in the dye collection tray 13. The collected dye liquor flows into the dye recycling tank 14 through the conveying pipe 15. During this process, the filter screen 16 filters out the fabric fibers and impurities in the dye liquor to ensure the cleanliness of the recycled dye liquor.

[0036] In the seventh step, the clean dye solution stored in the dye recovery tank 14 can be pumped back into the dyeing tank 2 for recycling. Operators can periodically check the condition of the filter screen 16, cleaning or replacing it in a timely manner to ensure filtration effectiveness.

[0037] Throughout the dyeing and recycling process, the three-stage combined recycling method of "pre-dehydration guide plate 4 for initial recycling + precision adjustable pressure extrusion for main recycling + auxiliary device for final recycling" can achieve an extremely high dye recovery rate. Compared with traditional dyeing equipment, dye waste is greatly reduced, production costs are significantly lowered, and the environmental pressure of wastewater treatment is alleviated.

Claims

1. A liquid-saving fabric dyeing device, characterized in that, include: Dyeing tank; A pre-drying guide plate is installed at the fabric outlet end of the dyeing tank. The pre-drying guide plate is provided with a guide slope that is inclined towards the inside of the dyeing tank. The extrusion roller assembly is located on the fabric travel path after the pre-drying guide plate; An auxiliary dye recovery device is installed on the fabric travel path after the extrusion roller group; The dye collection system is located below the extrusion roller assembly and the auxiliary dye recovery device.

2. The liquid-saving fabric dyeing apparatus according to claim 1, characterized in that, The extrusion roller assembly includes an upper extrusion roller and a lower extrusion roller, and also includes an extrusion pressure adjustment mechanism connected to the upper extrusion roller. The position of the upper extrusion roller relative to the lower extrusion roller is adjusted by the extrusion pressure adjustment mechanism.

3. The liquid-saving fabric dyeing apparatus according to claim 1, characterized in that, The auxiliary dye recovery device includes an elastic scraper, the scraping edge of which is in contact with the fabric surface.

4. The liquid-saving fabric dyeing apparatus according to claim 3, characterized in that, The auxiliary dye recovery device also includes a negative pressure suction port, which is connected to a negative pressure source.

5. The liquid-saving fabric dyeing apparatus according to claim 1, characterized in that, The dye collection system includes a dye collection tray and a dye recovery tank, and the dye recovery tank is connected to the dye collection tray through a conveying pipe.

6. The liquid-saving fabric dyeing apparatus according to claim 5, characterized in that, The conveying pipeline is equipped with a filter device, and the dye recovery tank is connected to the dyeing tank through a liquid delivery pipe to form a dye liquid circulation loop.

7. The liquid-saving fabric dyeing apparatus according to any one of claims 1-6, characterized in that, The dyeing tank is equipped with a heating device for controlling the temperature of the dyeing solution.

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