A desizing machine for pre-treatment of printing and dyeing

Abstract

The application discloses a desizing machine for printing and dyeing pretreatment. During use of the filtering assembly, liquid in the tank body flows along a water collector on one side, a first water pump, a coarse filter filtering assembly in a filtering box, a fine filter filtering assembly in the filtering box, a second water pump and a water collector on the other side, so that impurities in the liquid are filtered. During conveying of the fabric along a plurality of upper guide rollers and lower guide rollers, a plurality of V-shaped or inverted V-shaped pocket areas are formed, at this time, a liquid flow path close to the pocket areas is formed between two symmetrically arranged water collectors, so that the fabric close to the pocket areas can be washed, impurities are prevented from re-attaching to the fabric, desizing purity is improved, and desizing rework is reduced. Meanwhile, the bottom of the tank body is provided with an inverted conical sedimentation part, the bottom of the inverted conical sedimentation part is provided with a residue discharge valve, the residue discharge valve can be regularly opened, and impurities deposited in the inverted conical sedimentation part are discharged. Finally, the impurities in the desizing tank can be filtered and treated, and the qualified rate of printing and dyeing products is ensured.

Description

Technical Field

[0001] This invention relates to the field of printing and dyeing technology, and in particular to a desizing machine for pretreatment in printing and dyeing. Background Technology

[0002] In the dyeing and finishing industry, desizing machines are used in the desizing process, which refers to the process of removing sizing agents from fabrics. The warp yarns of fabrics such as cotton, viscose, and synthetic fibers are mostly sizing before weaving. Sizing agents affect the water absorption properties of fabrics during the dyeing and finishing process, as well as the quality of dyed and finished products, and increase the consumption of dyeing chemicals. Therefore, sizing agents should be removed before scouring to improve the uniformity and quality of subsequent scouring, bleaching, and dyeing. The core function is to restore the fiber's moisture absorption and reduce defects in later processes.

[0003] A desizing machine typically includes a fabric feeding device, three desizing tanks, three liquid guiding devices located at the ends of the three desizing tanks, a drying device, and a fabric exit device. The three desizing tanks respectively perform alkali treatment, acid hydrolysis treatment, and water washing treatment.

[0004] However, during the desizing process, impurities such as sizing agents, waxes, cottonseed hulls, and mineral debris that fall off the fabric will enter the working liquid of the desizing tank. The impurities are suspended in the working liquid and will redeposit on the surface of the fabric that has been desizing, resulting in incomplete desizing. This will cause color spots and color variations in subsequent dyeing, affecting the pass rate of the printed and dyed products. Summary of the Invention

[0005] The purpose of this invention is to provide a desizing machine for pretreatment of printing and dyeing, which can filter impurities in the desizing tank and ensure the qualification rate of the finished printing and dyeing products.

[0006] The above-mentioned technical objective of the present invention is achieved through the following technical solution: a desizing machine for pretreatment of dyeing and printing, comprising a fabric feeding device, three desizing tanks, three liquid guiding devices respectively disposed at the ends of the three desizing tanks, a drying device, and a fabric discharge device. Each desizing tank includes a tank body with inlet and outlet openings, a set of guide rollers disposed within the tank body, and three filtering devices for circulating and filtering the liquid within the three tanks. Each guide roller set includes multiple upper guide rollers rotatably connected to the tank body and multiple lower guide rollers rotatably connected to the tank body. The lower guide rollers are located below the middle of two adjacent upper guide rollers. The tank body is provided with a... The upper and lower guide rollers are rotatably connected to a support shaft, and water collectors for water supply and return are symmetrically arranged at both ends of the support shaft; the bottom of the tank is provided with multiple inverted conical settling sections, and a slag discharge valve is provided at the bottom of each inverted conical settling section; the filtration device includes a filter box, a coarse filter assembly installed in the filter box, a fine filter assembly installed in the filter screen, a first water pump for transporting liquid in the tank to the filter box, and a second water pump for transporting the filtered liquid in the filter box back to the tank. The first water pump is connected to multiple water collectors on one side, and the second water pump is connected to multiple water collectors on the other side.

[0007] By adopting the above technical solution, during the use of the filter components, the liquid in the tank flows along the water collector on one side, the first water pump, the coarse filter component in the filter box, the fine filter component in the filter box, the second water pump, and the water collector on the other side, thereby filtering impurities in the liquid. Furthermore, as the fabric is conveyed along multiple upper guide rollers and lower guide rollers, multiple V-shaped or inverted V-shaped bag areas are formed. At this time, a liquid flow path close to the bag areas is formed between two symmetrically arranged water collectors, which can wash the fabric in the vicinity, preventing impurities from re-adhering to the fabric, improving desizing cleanliness, and reducing desizing rework. Simultaneously, the inverted conical settling section at the bottom of the tank is equipped with a slag discharge valve, which can be opened periodically to remove impurities deposited in the inverted conical settling section. Ultimately, the impurities in the desizing tank are filtered, ensuring the pass rate of the dyeing and printing products.

[0008] A further configuration of the present invention is as follows: the water collector includes a housing disposed on a support shaft, a plurality of inlet and outlet ports arranged in a circumferential array on the end face of the housing near the middle of the support shaft, and an adjustment component disposed within the housing for adjusting the opening and closing of the plurality of inlet and outlet ports, the adjustment component being used to drive the inlet and outlet ports near the bag area during the fabric conveying process to remain open.

[0009] By adopting the above technical solution, since the inlet and outlet positions of the water collectors corresponding to the V-shaped and inverted V-shaped bag areas are different, the inlet and outlet of the bag area near the fabric conveying process can be kept open by adjusting the component. This allows the liquid flow between the two water collectors to flow along the bag area, improving the efficiency of impurities returning to the filter device for filtration.

[0010] A further configuration of the present invention is as follows: the adjustment assembly includes a fixed tube disposed on one side of the housing and located in the middle of a plurality of inlet and outlet ports, a telescopic tube telescopically disposed on the housing and with one end sleeved outside the fixed tube, a fan-shaped cover plate disposed on the telescopic tube, a compression spring sleeved on the telescopic tube and driving the fan-shaped cover plate to move toward the inlet and outlet ports, and a sealing plug arranged in an arc on the fan-shaped cover plate and inserted into the inlet and outlet ports. The end of the telescopic tube away from the fixed tube extends out of the housing and can be rotated to adjust the angle.

[0011] By adopting the above technical solution, the opening degree of the inlet and outlet of the bag area is adjusted differently for different bag shapes: by utilizing the adjustable blocking angle of the fan-shaped cover plate, the inlet and outlet of the bag area close to the fabric direction is fully opened, and the inlet and outlet of the bag area far away from the bag area is closed, which forces the liquid to flow along the inside of the bag area, accurately and directionally carrying the desizing impurities accumulated in the bag area, and finally efficiently sending them into the filtration device.

[0012] A further provision of the present invention is that: water collection pipes are provided on the front and rear sides of the tank, and a connecting pipe is provided between the water collection pipes and multiple water collectors on the same side; the first water pump is connected to the water collection pipe on one side, and the second water pump is connected to the water collection pipe on the other side.

[0013] By adopting the above technical solution, water collection pipes are set on the front and rear sides of the tank, and connecting pipes are set between the water collection pipes and multiple water collectors on the same side. The first water pump is connected to the water collection pipe on one side, and the second water pump is connected to the water collection pipe on the other side, thereby realizing the connection between multiple water collectors on both sides of the tank and the filter device.

[0014] A further configuration of the present invention is as follows: the coarse filtration assembly includes a first support frame disposed within a filter box, a first filter screen disposed within the first support frame near the liquid inflow side, and a second filter screen disposed within the first support frame near the liquid outflow side, wherein the first filter screen is a 30-mesh filter screen and the second filter screen is a 60-mesh filter screen; the fine filtration assembly includes a second support frame disposed within a filter box and a third filter screen disposed within the second support frame, wherein the third filter screen is a 120-mesh filter screen.

[0015] By adopting the above technical solution, a two-stage coarse filter of 30 mesh + 60 mesh is used to gradually intercept large and medium impurities of different sizes, allowing only a small amount of fine impurities to enter the 120 mesh fine filter at the back end, thus avoiding short-term clogging of the fine filter. For impurities in desizing wastewater such as large cottonseed hulls, mineral fragments, fine slurry and wax particles, the filter screens are matched with corresponding pore sizes according to grade, which can ultimately achieve stable interception of more than 90% of suspended impurities, and the filtration effect is more thorough.

[0016] A further provision of the present invention includes: a slag discharge hole at the bottom of the first support frame corresponding to the first filter screen and the second filter screen; a downwardly protruding slag discharge trough at the bottom of the filter box corresponding to the first support frame and the second support frame; a slag discharge pipe with a control valve at the bottom of the slag discharge trough; the first support frame is vertically mounted inside the filter box; a first lifting mechanism is provided between the first support frame and the filter box; the second support frame is vertically mounted inside the filter box; a second lifting mechanism is provided between the second support frame and the filter box; and a cleaning mechanism is provided inside the filter box to clean impurities on the first filter screen, the second filter screen, and the third filter screen during the lifting and lowering of the first support frame and the second support frame.

[0017] By adopting the above technical solution, when cleaning is required, the first and second lifting mechanisms drive the first and second support frames to rise and fall respectively. During the lifting process, the cleaning mechanism is triggered to clean the first and second coarse filter screens and the third fine filter screen in situ. The cleaned impurities fall directly into the slag discharge tank below and are finally discharged through the slag discharge pipe with a control valve. The entire process does not require disassembling and removing the filter screens, thus achieving integrated filtration and cleaning.

[0018] A further configuration of the present invention is as follows: the cleaning mechanism includes a first cleaning brush disposed within the filter box and abutting against the top of the liquid inlet side of the first filter screen; a second cleaning brush disposed within the filter box and abutting against the top of the liquid inlet side of the second filter screen; a third cleaning brush disposed within the filter screen and abutting against the top of the liquid inlet side of the third filter screen; a first flushing pipe disposed within the filter box and located at the top between the first and second filter screens after the coarse filter assembly is installed; a second flushing pipe disposed within the filter box and close to the liquid inlet side of the third filter screen; and a third water pump communicating with the first and second flushing pipes; the first flushing pipe has a plurality of first nozzles facing the liquid outlet side of the first filter screen; the first flushing pipe has a plurality of second nozzles facing the liquid inlet side of the second filter screen; and the second flushing pipe has a plurality of third nozzles facing the liquid inlet side of the third filter screen.

[0019] By adopting the above technical solution, for the liquid inlet side of the first and second filter screens of the coarse filtration assembly, as well as the space between them, the first cleaning brush scrapes off the attached impurities on the liquid inlet side of the first filter screen, and the second cleaning brush simultaneously scrapes off the residual dirt on the liquid outlet side of the second filter screen. The impurities sandwiched between the two filter screens are flushed off by the high pressure of the first flushing pipe located at the top of the gap. Since the impurity particles on the first filter screen are relatively large, the backwashing of the first filter screen by the first flushing pipe can ensure a good rinsing effect, and the forward flushing of the second filter screen by the first flushing pipe also has a good rinsing effect. For the third filter screen of the fine filtration, a third cleaning brush is also configured for physical scraping, and the second flushing pipe is configured for water flushing. Whether it is clumps of slurry or wax and fine cotton fibers attached to the mesh, they can be completely removed. The cleaning effect is far better than that of brushing or rinsing alone.

[0020] A further configuration of the present invention is as follows: The filter box is provided with first lifting tracks on both sides for vertical connection between the two sides of the first support frame; the first lifting mechanism includes a first reversing wheel on the top outer layer of the first lifting track, a first dual-shaft output winch on the top of the filter box, and second reversing wheels on both sides of the bottom of the filter box; the two traction ropes of the first dual-shaft conveying winch pass over the second reversing wheel on the same side and are connected to the top of the first support frame; the filter box is provided with second lifting tracks on both sides for vertical connection between the two sides of the second support frame; the second lifting mechanism includes a third reversing wheel on the top outer layer of the second lifting track, a second dual-shaft output winch on the top of the filter box, and fourth reversing wheels on both sides of the bottom of the filter box; the two traction ropes of the second dual-shaft conveying winch pass over the fourth reversing wheel on the same side and are connected to the top of the second support frame.

[0021] By adopting the above technical solution, in the first lifting mechanism, the first lifting rails on both sides provide stable lifting guidance for the first support frame. The first dual-axis output winch synchronously outputs two traction ropes, which are redirected by passing around the bottom second reversing wheel and the top first reversing wheel, respectively. The two ends are symmetrically connected to the top of the first support frame. The first dual-axis output winch can drive the first support frame to rise smoothly along the rails. When releasing the ropes, the support frame descends by its own weight. The synchronous output of the dual axes ensures that the lifting on both sides is synchronized and there will be no jamming or tilting. Similarly, the second lifting mechanism can drive the lifting on both sides of the second support frame to rise synchronously. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the structure of a set of desizing tanks and liquid guiding cloth devices in this invention; Figure 3 yes Figure 2 A partial structural section view based on the basic structure; Figure 4 This is a schematic diagram of the structure of the support shaft, upper guide roller, and water collector in this invention; Figure 5 yes Figure 4 A partial structural cross-sectional view based on the foundation; Figure 6 This is a schematic diagram of the filtration device in this invention; Figure 7 yes Figure 6 A partial structural cross-sectional view based on the basic structure.

[0024] In the diagram: 1. Fabric feeding device; 2. Desizing tank; 21. Tank body; 211. Inverted conical settling section; 212. Slag discharge valve; 22. Guide roller assembly; 221. Upper guide roller; 222. Lower guide roller; 23. Filtering device; 231. Filter box; 2311. Slag discharge trough; 2312. Slag discharge pipe; 2313. First lifting track; 2314. Second lifting track; 232. Coarse filter assembly; 2321. First support frame; 23211. Slag discharge through hole; 2322. First filter screen; 2323. Second filter screen; 233. Fine filter assembly; 2331. Second support frame; 2332. Third filter screen; 234. First water pump; 235. Second water pump; 236. First lifting mechanism; 2361. First reversing wheel; 2362. First dual-shaft output. 2363. Winch; 237. Second reversing wheel; 238. Second lifting mechanism; 2371. Third reversing wheel; 2372. Second dual-shaft output winch; 2373. Fourth reversing wheel; 238. Cleaning mechanism; 2381. First cleaning brush; 2383. Second cleaning brush; 2383. Third cleaning brush; 2384. First flushing pipe; 2385. Second flushing pipe; 2386. Third water pump; 24. Support shaft; 25. Water collector; 251. Housing; 252. Inlet and outlet; 253. Adjustment component; 2531. Fixed pipe; 2532. Telescopic pipe; 2533. Fan-shaped cover plate; 2534. Compression spring; 2535. Sealing plug; 26. Water collection pipe; 261. Connecting pipe; 3. Liquid-rolling guide device; 4. Drying device; 5. Fabric discharge device. Detailed Implementation

[0025] The technical solution of the present invention will now be clearly and completely described with reference to specific embodiments. Obviously, the described embodiments are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0026] Example: A desizing machine for pretreatment of dyeing and printing, such as Figures 1 to 3 As shown, the system includes a fabric feeding device 1, three desizing tanks 2, three liquid-pulping guide devices 3 respectively located at the ends of the three desizing tanks 2, a drying device 4, and a fabric discharge device 5. Each desizing tank 2 includes a tank body 21 with inlet and outlet openings, a guide roller assembly 22 located within the tank body 21, and three filter devices 23 that circulate and filter the liquid within the three tank bodies 21. The guide roller assembly 22 includes multiple upper guide rollers 221 rotatably connected within the tank body 21 and multiple lower guide rollers 222 rotatably connected within the tank body 21. The lower guide rollers 222 are located below the middle of two adjacent upper guide rollers 221. A guide plate extending obliquely to the preceding liquid-pulping guide device 3 is provided at the inlet opening of each subsequent desizing tank 2. The liquid within the liquid-pulping guide device 3 returns to the desizing tank 2 via a water pump.

[0027] like Figures 2 to 4 As shown, a support shaft 24 is provided inside the tank 21 for rotating the upper guide roller 221 and the lower guide roller 222. Water collectors 25 are symmetrically arranged at both ends of the support shaft 24 to realize water supply and water return respectively. Multiple inverted conical settling sections 211 are arranged at the bottom of the tank 21, and a slag discharge valve 212 is provided at the bottom of the inverted conical settling section 211.

[0028] like Figures 3 to 5 As shown, the water collector 25 includes a housing 251 mounted on a support shaft 24, a plurality of inlet and outlet ports 252 arranged in a circumferential array on the end face of the housing 251 near the middle of the support shaft 24, and an adjustment component 253 disposed inside the housing 251 for adjusting the opening and closing of the plurality of inlet and outlet ports 252. The adjustment component 253 is used to drive the inlet and outlet ports 252 near the bag area during the fabric conveying process to remain open. The adjustment assembly 253 includes a fixed tube 2531 disposed on one side inside the housing 251 and located in the middle of multiple inlet and outlet ports 252; a telescopic tube 2532 telescopically disposed on the housing 251 and with one end sleeved outside the fixed tube 2531; a fan-shaped cover plate 2533 disposed on the telescopic tube 2532; a compression spring 2534 sleeved on the telescopic tube 2532 and driving the fan-shaped cover plate 2533 to move toward the inlet and outlet ports 252; and a sealing plug 2535 arranged in an arc on the fan-shaped cover plate 2533 and inserted into the inlet and outlet ports 252. The end of the telescopic tube 2532 away from the fixed tube 2531 extends out of the housing 251 and can be rotated to adjust the angle.

[0029] like Figures 2 to 3 , Figures 6 to 7 As shown, the filtration device 23 includes a filter box 231, a coarse filter assembly 232 disposed within the filter box 231, a fine filter assembly 233 disposed within a filter screen, a first water pump 234 that transports liquid from the tank 21 to the filter box 231, and a second water pump 235 that transports the filtered liquid from the filter box 231 back to the tank 21. Water collection pipes 26 are provided on both the front and rear sides of the tank 21. A connecting pipe 261 is provided between the water collection pipes 26 and multiple water collectors 25 on the same side. The first water pump 234 is connected to the water collection pipe 26 on one side, and the second water pump 235 is connected to the water collection pipe 26 on the other side.

[0030] like Figure 3 , Figure 7 As shown, the coarse filtration assembly 232 includes a first support frame 2321 disposed within the filter box 231, a first filter screen 2322 disposed within the first support frame 2321 near the liquid inflow side, and a second filter screen 2323 disposed within the first support frame 2321 near the liquid outflow side. The first filter screen 2322 is a 30-mesh screen, and the second filter screen 2323 is a 60-mesh screen. The fine filtration assembly 233 includes a second support frame 2331 disposed within the filter box 231, and a third filter screen 2332 disposed within the second support frame 2331. The third filter screen 2332 is a 120-mesh screen.

[0031] like Figure 7 As shown, the bottom of the first support frame 2321 between the first filter screen 2322 and the second filter screen 2323 is provided with a slag discharge hole 23211, and the bottom of the filter box 231 between the first support frame 2321 and the second support frame 2331 is provided with a downwardly protruding slag discharge trough 2311, and the bottom of the slag discharge trough 2311 is provided with a slag discharge pipe 2312 with a control valve.

[0032] like Figure 2 and Figure 3 , Figure 6 and Figure 7As shown, the first support frame 2321 is vertically mounted inside the filter box 231, and a first lifting mechanism 236 is provided between the first support frame 2321 and the filter box 231. The second support frame 2331 is vertically mounted inside the filter box 231, and a second lifting mechanism 237 is provided between the second support frame 2331 and the filter box 231. First lifting rails 2313 are provided on both sides of the filter box 231 for vertical connection between the two sides of the first support frame 2321. The first lifting mechanism 236 includes a first reversing wheel 2361 located on the top outer layer of the first lifting rail 2313, a first dual-shaft output winch 2362 located on the top of the filter box 231, and second reversing wheels 2363 located on both sides of the bottom of the filter box 231. The two traction ropes of the first dual-shaft conveying winch pass over the second reversing wheel 2363 on the same side and are then connected to the top of the first support frame 2321. The filter box 231 is provided with a second lifting rail 2314 on both sides for the lifting connection of the second support frame 2331. The second lifting mechanism 237 includes a third reversing wheel 2371 on the top outer layer of the second lifting rail 2314, a second dual-shaft output winch 2372 on the top of the filter box 231, and a fourth reversing wheel 2373 on both sides of the bottom of the filter box 231. The two traction ropes of the second dual-shaft conveying winch pass around the fourth reversing wheel 2373 on the same side, and are connected to the top of the second support frame 2331 after the reversing wheel.

[0033] like Figure 2 and Figure 3 , Figure 6 and Figure 7 As shown, the filter box 231 is equipped with a cleaning mechanism 238 that cleans the impurities on the first filter screen 2322, the second filter screen 2323, and the third filter screen 2332 during the lifting and lowering of the first support frame 2321 and the second support frame 2331. The cleaning mechanism 238 includes a first cleaning brush 2381 disposed in the filter box 231 and abutting against the top of the liquid inlet side of the first filter screen 2322; a second cleaning brush 2383 disposed in the filter box 231 and abutting against the top of the liquid inlet side of the second filter screen 2323; a third cleaning brush 2383 disposed in the filter screen and abutting against the top of the liquid inlet side of the third filter screen 2332; a first flushing pipe 2384 disposed in the filter box 231 and located at the top between the first filter screen 2322 and the second filter screen 2323 after the coarse filter assembly 232 is installed; a second flushing pipe 2385 disposed in the filter box 231 and close to the liquid inlet side of the third filter screen 2332; and a third water pump 2386 communicating with the first flushing pipe 2384 and the second flushing pipe 2385. The first flushing pipe 2384 has a plurality of first nozzles facing the liquid outlet side of the first filter screen 2322, the first flushing pipe 2384 has a plurality of second nozzles facing the liquid inlet side of the second filter screen 2323, and the second flushing pipe 2385 has a plurality of third nozzles facing the liquid inlet side of the third filter screen 2332.

[0034] Implementation effect: During the use of the filter assembly, the liquid in the tank 21 flows along the water collector 25 on one side, the first water pump 234, the coarse filter assembly 232 in the filter box 231, the fine filter assembly 233 in the filter box 231, the second water pump 235, and the water collector 25 on the other side, thereby filtering impurities in the liquid; and the fabric forms multiple V-shaped or inverted V-shaped bag areas as it is conveyed along multiple upper guide rollers and lower guide rollers 222. At this time, the two symmetrically arranged water collectors 25 A liquid flow path is formed between the two areas, which can wash the fabric in the vicinity, prevent impurities from re-adhering to the fabric, improve the cleanliness of desizing, and reduce desizing rework. At the same time, the bottom of the tank 21 has an inverted conical settling section 211, and the bottom of the inverted conical settling section 211 is equipped with a slag discharge valve 212. The slag discharge valve 212 can be opened periodically to remove impurities deposited in the inverted conical settling section 211. Finally, the impurities in the desizing tank 2 can be filtered to ensure the qualification rate of the printed and dyed products.

[0035] Because the inlet and outlet ports 252 of the water collectors 25 corresponding to the V-shaped and inverted V-shaped bag areas are in different positions, the inlet and outlet ports 252 of the bag area near the fabric conveying process can be kept open by adjusting the component 253. This allows the liquid flow between the two water collectors 25 to flow along the inside of the bag area, improving the efficiency of impurities returning to the filter device 23 for filtration. Differentiated opening degree adjustment is made for the inlet and outlet ports 252 of different bag shapes: using the adjustable blocking angle of the fan-shaped cover plate 2533, the inlet and outlet ports 252 of the bag area near the fabric feeding direction are fully opened, while the inlet and outlet ports 252 of the bag area away from the bag area are closed. This forces the liquid to flow along the inside of the bag area, accurately and directionally carrying the desizing impurities accumulated in the bag area, and finally efficiently sending them into the filter device 23.

[0036] The pre-filter consists of a 30-mesh and a 60-mesh coarse filter, which first intercepts large and medium-sized impurities of different sizes, allowing only a small amount of fine impurities to enter the 120-mesh fine filter at the back end, thus avoiding short-term clogging of the fine filter. For impurities in desizing wastewater, such as large cottonseed hulls, mineral fragments, fine slurry, and wax particles, the filter screens are matched with corresponding pore sizes according to grade, which can ultimately achieve stable interception of more than 90% of suspended impurities, resulting in a more thorough filtration effect.

[0037] When cleaning is required, the first lifting mechanism 236 and the second lifting mechanism 237 drive the first support frame 2321 and the second support frame 2331 to rise and fall respectively. During the lifting process, the cleaning mechanism 238 is triggered to clean the first and second filter screens 2323 of the coarse filter and the third filter screen 2332 of the fine filter in situ. The cleaned impurities fall directly into the slag discharge tank 2311 below and are finally discharged through the slag discharge pipe 2312 with a control valve. The filter screens do not need to be disassembled and removed throughout the process, realizing the integration of filtration and cleaning. For the inlet side of the first filter screen 2322 and the second filter screen 2323 of the coarse filtration assembly, as well as the space between them, the first cleaning brush 2381 scrapes off the attached impurities on the inlet side of the first filter screen 2322, while the second cleaning brush 2383 simultaneously scrapes off the residual dirt on the outlet side of the second filter screen 2323. Impurities trapped between the two filter screens are flushed off by the first flushing pipe 2384 located at the top of the gap under high pressure. Since the impurity particles on the first filter screen 2322 are relatively large, the backwashing of the first filter screen 2322 by the first flushing pipe 2384 can ensure a good rinsing effect. The forward flushing of the second filter screen 2323 by the first flushing pipe 2384 also has a good rinsing effect. For the third filter screen 2332 of the fine filtration, the third cleaning brush 2383 is also configured for physical scraping, and the second flushing pipe 2385 is configured for water flushing. Whether it is clumps of slurry or wax and fine cotton fibers attached to the mesh, they can be completely removed. The cleaning effect is far better than brushing or rinsing alone.

Claims

1. A desizing machine for pretreatment of dyeing and printing, comprising a fabric feeding device (1), three desizing tanks (2), three liquid guiding devices (3) respectively disposed at the ends of the three desizing tanks (2), a drying device (4), and a fabric discharge device (5), wherein the desizing tank (2) comprises a tank body (21) having a fabric inlet and outlet opening, a guide roller group (22) disposed in the tank body (21), and three filter devices (23) respectively for circulating and filtering the liquid in the three tank bodies (21), wherein the guide roller group (22) comprises a plurality of upper guide rollers (221) rotatably connected in the tank body (21) and a plurality of lower guide rollers (222) rotatably connected in the tank body (21), wherein the lower guide rollers (222) are located below the middle of two adjacent upper guide rollers (221), characterized in that: The tank (21) is provided with a support shaft (24) for the upper guide roller (221) and the lower guide roller (222) to rotate and connect. The two ends of the support shaft (24) are symmetrically provided with water collectors (25) for water supply and water return respectively. The bottom of the tank (21) is provided with a plurality of inverted conical settling sections (211) arranged in a row, and the bottom of the inverted conical settling section (211) is provided with a slag discharge valve (212). The filtration device (23) includes a filter box (231), a coarse filter assembly (232) installed in the filter box (231), a fine filter assembly (233) installed in the filter screen, a first water pump (234) that transports the liquid in the tank (21) to the filter box (231), and a second water pump (235) that transports the filtered liquid in the filter box (231) back to the tank (21). The first water pump (234) is connected to multiple water collectors (25) on one side, and the second water pump (235) is connected to multiple water collectors (25) on the other side.

2. The desizing machine for pretreatment of dyeing and printing according to claim 1, characterized in that: The water collector (25) includes a housing (251) mounted on a support shaft (24), a plurality of inlet and outlet ports (252) arranged in a circumferential array on the end face of the housing (251) near the middle of the support shaft (24), and an adjustment component (253) mounted inside the housing (251) for adjusting the opening and closing of the plurality of inlet and outlet ports (252). The adjustment component (253) is used to keep the inlet and outlet ports (252) near the bag area during the fabric conveying process open.

3. A desizing machine for pretreatment of dyeing and printing according to claim 2, characterized in that: The adjustment assembly (253) includes a fixed tube (2531) disposed on one side inside the housing (251) and located in the middle of multiple inlet and outlet ports (252), a telescopic tube (2532) telescopically disposed on the housing (251) and with one end sleeved outside the fixed tube (2531), a fan-shaped cover plate (2533) disposed on the telescopic tube (2532), a compression spring (2534) sleeved on the telescopic tube (2532) and driving the fan-shaped cover plate (2533) to move toward the inlet and outlet ports (252), and a sealing plug (2535) arranged in an arc on the fan-shaped cover plate (2533) and inserted into the inlet and outlet ports (252). The end of the telescopic tube (2532) away from the fixed tube (2531) extends out of the housing (251) and can be rotated to adjust the angle.

4. A desizing machine for pretreatment of printing and dyeing according to claim 3, characterized in that: Water collection pipes (26) are provided on the front and rear sides of the tank (21). A connecting pipe (261) is provided between the water collection pipe (26) and multiple water collectors (25) on the same side. The first water pump (234) is connected to the water collection pipe (26) on one side, and the second water pump (235) is connected to the water collection pipe (26) on the other side.

5. A desizing machine for pretreatment of printing and dyeing according to claim 1, characterized in that: The coarse filtration assembly (232) includes a first support frame (2321) disposed in the filter box (231), a first filter screen (2322) disposed on the side of the first support frame (2321) near the liquid inflow side, and a second filter screen (2323) disposed on the side of the first support frame (2321) near the liquid outflow side. The first filter screen (2322) is a 30-mesh filter screen, and the second filter screen (2323) is a 60-mesh filter screen. The fine filtration assembly (233) includes a second support frame (2331) disposed in the filter box (231) and a third filter screen (2332) disposed in the second support frame (2331), wherein the third filter screen (2332) is a 120-mesh filter screen.

6. A desizing machine for pretreatment of printing and dyeing according to claim 5, characterized in that: The first support frame (2321) is provided with a slag discharge hole (23211) at the bottom between the first filter screen (2322) and the second filter screen (2323). The filter box (231) is provided with a downwardly protruding slag discharge trough (2311) at the bottom between the first support frame (2321) and the second support frame (2331). The bottom of the slag discharge trough (2311) is provided with a slag discharge pipe (2312) with a control valve. The first support frame (2321) is lifted and installed inside the filter box (231), and a first lifting mechanism (236) is provided between the first support frame (2321) and the filter box (231). The second support frame (2331) is lifted and installed inside the filter box (231), and a second lifting mechanism (237) is provided between the second support frame (2331) and the filter box (231). The filter box (231) is equipped with a cleaning mechanism (238) that cleans the impurities on the first filter screen (2322), the second filter screen (2323), and the third filter screen (2332) during the lifting and lowering of the first support frame (2321) and the second support frame (2331).

7. A desizing machine for pretreatment of printing and dyeing according to claim 6, characterized in that: The cleaning mechanism (238) includes a first cleaning brush (2381) disposed in the filter box (231) and abutting against the top of the liquid inlet side of the first filter screen (2322); a second cleaning brush (2383) disposed in the filter box (231) and abutting against the top of the liquid inlet side of the second filter screen (2323); a third cleaning brush (2383) disposed in the filter screen and abutting against the top of the liquid inlet side of the third filter screen (2332); a first flushing pipe (2384) disposed in the filter box (231) and located at the top between the first filter screen (2322) and the second filter screen (2323) after the coarse filter assembly (232) is installed; a second flushing pipe (2385) disposed in the filter box (231) and close to the liquid inlet side of the third filter screen (2332); and a third water pump (2386) connected to the first flushing pipe (2384) and the second flushing pipe (2385). The first flushing pipe (2384) has a plurality of first nozzles facing the liquid outlet side of the first filter (2322), the first flushing pipe (2384) has a plurality of second nozzles facing the liquid inlet side of the second filter (2323), and the second flushing pipe (2385) has a plurality of third nozzles facing the liquid inlet side of the third filter (2332).

8. A desizing machine for pretreatment of printing and dyeing according to claim 6, characterized in that: The filter box (231) is provided with a first lifting track (2313) on both sides for the lifting connection of the first support frame (2321) on both sides. The first lifting mechanism (236) includes a first reversing wheel (2361) on the top outer layer of the first lifting track (2313), a first dual-shaft output winch (2362) on the top of the filter box (231), and a second reversing wheel (2363) on both sides of the bottom of the filter box (231). The two traction ropes of the first dual-shaft conveying winch pass over the second reversing wheel (2363) on the same side and are connected to the top of the first support frame (2321). The filter box (231) is provided with a second lifting track (2314) on both sides for the lifting and lowering connection of the second support frame (2331). The second lifting mechanism (237) includes a third reversing wheel (2371) on the top outer layer of the second lifting track (2314), a second dual-shaft output winch (2372) on the top of the filter box (231), and a fourth reversing wheel (2373) on both sides of the bottom of the filter box (231). The two traction ropes of the second dual-shaft conveying winch pass around the fourth reversing wheel (2373) on the same side, and are connected to the top of the second support frame (2331) after the reversing wheel.

Images