Printing and dyeing machine and self-cleaning method thereof

Abstract

The printing and dyeing machine comprises a controller, a liquid storage cylinder, a waste liquid cylinder and a plurality of printing and dyeing units, and each printing and dyeing unit further comprises a liquid supply pipeline which comprises a first liquid supply pipeline, a second liquid supply pipeline and a liquid supply three-way valve; the waste liquid pipeline comprises a first waste liquid pipeline, a second waste liquid pipeline and a waste liquid three-way valve; the cleaning pipeline comprises a first cleaning pipeline and a second cleaning pipeline; and the power source is arranged on the liquid supply pipeline and is electrically connected with the controller. Through switching of the liquid supply three-way valve and the waste liquid three-way valve, the printing and dyeing units have two cleaning waterways of forward cleaning and reverse cleaning, and when each printing and dyeing unit is cleaned, the second liquid supply pipeline and the nozzle of each printing and dyeing unit can be cleaned in the forward direction (namely the same as the flowing direction of the dye liquid) so as to clean the dye liquid in the printing and dyeing units; and then the second liquid supply pipeline and the spray head of the printing and dyeing unit are reversely cleaned to clean impurities such as particles accumulated in the second liquid supply pipeline and the spray head, and the cleaning effect on the printing and dyeing unit, especially the spray head is better.

Description

Technical Field

[0001] The present invention belongs to the field of printing and dyeing equipment, and particularly relates to a printing and dyeing machine and its self-cleaning method. Background Art

[0002] At present, multiple spray heads are usually arranged side by side on the market's printing and dyeing machines to spray the fabric. When changing the color of the spray heads on the existing printing and dyeing machines, it is necessary to replace the cleaning liquid in the dye vat storing the dye liquor, and the cleaning liquid runs along the running path of the dye liquor to each spray head to clean and discharge the spray heads. However, during the cleaning process, since the flow path and direction of the cleaning liquid are the same as those of the dye liquor, it is difficult to wash away the particulate matter accumulated with the dye liquor at some positions (such as the position of an uneven stepped structure), resulting in incomplete cleaning. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a printing and dyeing machine and its self-cleaning method to solve the problem of incomplete cleaning of the printing and dyeing machine.

[0004] To solve the above technical problem, the present invention adopts the following technical scheme: A printing and dyeing machine includes a controller, a liquid storage tank, a waste liquid tank, and multiple printing and dyeing units. The printing and dyeing units include spray heads for spraying dye liquor, and the spray heads of multiple printing and dyeing units are arranged side by side. The printing and dyeing unit further includes: a liquid supply pipeline, including a first liquid supply pipeline, a second liquid supply pipeline, and a liquid supply three-way valve. The first liquid supply pipeline is connected between the liquid storage tank and the liquid supply three-way valve, and the second liquid supply pipeline is connected between the spray head and the liquid supply three-way valve; a waste liquid pipeline, including a first waste liquid pipeline, a second waste liquid pipeline, and a waste liquid three-way valve. The first waste liquid pipeline is connected between the spray head and the waste liquid three-way valve, and the second waste liquid pipeline is connected between the waste liquid three-way valve and the waste liquid tank; a cleaning pipeline, including a first cleaning pipeline and a second cleaning pipeline. The liquid storage tank and the waste liquid three-way valve are connected through the first cleaning pipeline, and the waste liquid tank and the liquid supply three-way valve are connected through the second cleaning pipeline; a power source, which is arranged on the liquid supply pipeline and is electrically connected to the controller to pump the liquid in the liquid storage tank to the spray head and the waste liquid tank. The technical scheme has the following technical effects:

[0005] When a printing and dyeing machine dyes fabrics, there will be some particulate matters in the dye liquor flowing towards the nozzle in the liquid supply pipeline. When the dye liquor passes through the internal uneven structures (such as steps) or components inside the nozzle and other parts, these particulate matters are extremely likely to be blocked and accumulate. In the present invention, a second cleaning pipeline is arranged on the printing and dyeing unit to connect the liquid supply three-way valve and the waste liquid tank, and a first cleaning pipeline is arranged to connect the waste liquid three-way valve and the liquid storage tank, so that the printing and dyeing machine can switch between the liquid supply three-way valve and the waste liquid three-way valve, enabling the printing and dyeing unit to have two cleaning waterways, namely forward cleaning and reverse cleaning. When cleaning each printing and dyeing unit, the second liquid supply pipeline and the nozzle of the printing and dyeing unit can be first cleaned forward (i.e., in the same direction as the flow direction of the dye liquor) to clean the dye liquor inside, and then the second liquid supply pipeline and the nozzle of the printing and dyeing unit can be cleaned reversely to clean the accumulated particulate matters and other impurities inside. The cleaning effect on the printing and dyeing unit, especially the nozzle, is better, which is convenient for later color change and operation, avoids the accumulation of particulate matters and other impurities in the nozzle and other structures of the printing and dyeing unit from affecting the operation of the printing and dyeing machine, and prolongs the service life of the printing and dyeing machine.

[0006] In the above-mentioned printing and dyeing machine, the first cleaning pipeline is connected to the first liquid supply pipeline to communicate with the liquid storage tank through the first liquid supply pipeline. The first cleaning pipeline communicates with the liquid storage tank through the first liquid supply pipeline, so that the liquid storage tank only needs to be connected to the first liquid supply pipeline to enable the cleaning liquid inside to flow to the liquid supply three-way valve or the waste liquid three-way valve, reducing the assembly difficulty between the printing and dyeing unit and the liquid storage tank; and / or, the second cleaning pipeline is connected to the second waste liquid pipeline to communicate with the waste liquid tank through the second waste liquid pipeline. The second cleaning pipeline communicates with the waste liquid tank through the second waste liquid pipeline, so that the waste liquid tank only needs to be connected to the second waste liquid pipeline to enable the collection of the cleaning liquid in the first waste liquid pipeline and the second cleaning pipeline, reducing the assembly difficulty between the printing and dyeing unit and the waste liquid tank.

[0007] In the above-mentioned printing and dyeing machine, the power source is a two-way power pump, and the two-way power pump is arranged on the second liquid supply pipeline. By arranging the two-way power pump on the second liquid supply pipeline, the two-way power pump can pump the liquid in the liquid storage tank during both forward cleaning and reverse cleaning, so that only one two-way power pump is arranged on each printing and dyeing unit to achieve printing and self-cleaning, reducing the production cost.

[0008] In the above-mentioned printing and dyeing machine, the bidirectional power pump includes a forward liquid pump unit and a reverse liquid pump unit connected in parallel with the forward liquid pump unit; the forward liquid pump unit includes a first liquid pump arranged forward and a forward switch valve connected in series with the first liquid pump, and the reverse liquid pump unit includes a second liquid pump arranged reversely and a reverse switch valve connected in series with the second liquid pump. When the printing and dyeing unit is cleaned forward, the forward switch valve is opened, the reverse switch valve is closed, and the first liquid pump operates to draw the cleaning liquid in the liquid storage cylinder forward to the waste liquid cylinder; when the printing and dyeing unit is cleaned reversely, the reverse switch valve is opened, the forward switch valve is closed, and the second liquid pump operates to draw the cleaning liquid in the liquid storage cylinder reversely to the waste liquid cylinder.

[0009] In the above-mentioned printing and dyeing machine, a waste liquid valve for opening and closing the first waste liquid pipeline is provided on the first waste liquid pipeline. When the waste liquid valve is closed, it has a cutting effect on the first waste liquid pipeline. When the printing and dyeing machine dyes the fabric, it prevents the dyeing liquid from impacting the waste liquid three-way valve, thereby avoiding the leakage of the dyeing liquid to the waste liquid cylinder through the waste liquid three-way valve and saving the dyeing liquid.

[0010] In the above-mentioned printing and dyeing machine, a hydraulic gauge for detecting the pressure at the nozzle is also provided on the first waste liquid pipeline. The hydraulic gauge is arranged between the waste liquid valve and the nozzle and is electrically connected to the controller; alternatively, a hydraulic gauge for detecting the pressure at the nozzle is also provided on the second liquid supply pipeline, and the hydraulic gauge is electrically connected to the controller. When the printing and dyeing machine operates to dye the fabric, the hydraulic gauge can detect the pressure at the nozzle and transmit it to the controller. When the nozzle holes are blocked and the pressure at the nozzle is too high, the hydraulic gauge can quickly feedback the detected pressure to the controller to prompt the staff to clean or replace the nozzle to ensure the stable spraying of the fabric by the nozzle.

[0011] In the above-mentioned printing and dyeing machine, an alarm is also provided on the controller. When the hydraulic gauge detects that the pressure of the nozzle exceeds the set value, the alarm sounds. When the hydraulic gauge detects that the pressure of the nozzle exceeds the set pressure value, the alarm sounds to prompt the staff so that the user can discover it in time and improve the user experience.

[0012] In the above-mentioned printing and dyeing machine, an alarm is also provided on the first waste liquid pipeline. The printing and dyeing unit further includes a droplet optical imaging detection device electrically connected to the controller. The droplet optical imaging detection device is arranged at the nozzle to detect the dyeing liquid droplets ejected from the nozzle. When the droplet optical imaging detection device detects that the dyeing liquid droplets are not within the set range during the printing and dyeing process, the alarm sounds to prompt the user to clean as soon as possible. The droplet optical imaging detection device monitors the shape and size of the droplets, which is more accurate and reliable.

[0013] In the above-mentioned printing and dyeing machine, the printing and dyeing machine further includes a liquid distribution pipeline. The liquid supply pipelines of multiple printing and dyeing units are connected to the same liquid storage tank through the liquid distribution pipeline, reducing the number of liquid storage tanks, simplifying the internal structure of the printing and dyeing machine, and reducing the production and processing difficulty; or, there are multiple liquid storage tanks, and the liquid supply pipelines of multiple printing and dyeing units are connected to the multiple liquid storage tanks in one-to-one correspondence. By placing different colored dyeing liquids in different liquid storage tanks, synchronous spraying of multiple colors can be achieved.

[0014] In the above-mentioned printing and dyeing machine, the liquid supply three-way valve includes a first switching valve and a second switching valve. The first switching valve is connected between the first liquid supply pipeline and the second liquid supply pipeline, and the second switching valve is connected between the second liquid supply pipeline and the second cleaning pipeline; the waste liquid three-way valve includes a third switching valve and a fourth switching valve. The third switching valve is connected between the first waste liquid pipeline and the second waste liquid pipeline, and the fourth switching valve is connected between the first waste liquid pipeline and the first cleaning pipeline. When the printing and dyeing unit is being cleaned forward, the first switching valve is opened and the second switching valve is closed so that the first liquid supply pipeline is connected to the second liquid supply pipeline, the third switching valve is opened and the fourth switching valve is closed so that the first waste liquid pipeline is connected to the second waste liquid pipeline. When the printing and dyeing unit is being cleaned backward, the fourth switching valve is opened and the third switching valve is closed so that the first waste liquid pipeline is connected to the first cleaning pipeline, the second switching valve is opened and the first switching valve is closed so that the second liquid supply pipeline is connected to the second cleaning pipeline. By setting the liquid supply three-way valve into a structure combined with the first switching valve and the second switching valve, and setting the waste liquid three-way valve into a structure combined with the third switching valve and the fourth switching valve, the second liquid supply pipeline is connected or interrupted with the first liquid supply pipeline and the second cleaning pipeline respectively through two switching valves, and the second waste liquid pipeline is connected or interrupted with the second waste liquid pipeline and the first cleaning pipeline respectively through two switching valves. Each water circuit is independently controlled through different switching valves, which is more stable and reliable.

[0015] The present invention also provides a self-cleaning method for a printing and dyeing machine. Using the above-mentioned printing and dyeing machine, the self-cleaning method includes the following steps: Preparation stage, injecting cleaning liquid into the liquid storage tank; Forward cleaning stage, switching the liquid supply three-way valve to connect the first liquid supply pipeline to the second liquid supply pipeline, switching the waste liquid three-way valve to connect the first waste liquid pipeline to the second waste liquid pipeline, and the power source rotates forward to extract the cleaning liquid in the liquid storage tank to the waste liquid tank to clean the printing and dyeing unit forward; Reverse cleaning stage, switching the liquid supply three-way valve to connect the second cleaning pipeline to the second liquid supply pipeline, and switching the waste liquid three-way valve to connect the first cleaning pipeline to the first waste liquid pipeline, and the power source rotates backward to extract the cleaning liquid in the liquid storage tank to the waste liquid tank to clean the printing and dyeing unit backward.

[0016] In the self-cleaning method of the above-mentioned printing and dyeing machine, a waste liquid valve for opening and closing the first waste liquid pipeline is provided on the first waste liquid pipeline, and the waste liquid valve is opened during the preparation stage.

[0017] In the above self-cleaning method of a printing and dyeing machine, a flow detection device is provided on the second liquid supply pipeline. During the normal washing stage, the flow detection device detects the flow rate of the cleaning liquid flowing towards the nozzle. After washing for a predetermined time at a predetermined flow rate during the normal washing stage, it switches to the reverse washing stage.

[0018] In the above self-cleaning method of a printing and dyeing machine, a hydraulic gauge is provided on the first waste liquid pipeline or the second liquid supply pipeline. During the reverse washing stage, the hydraulic gauge detects the pressure at the nozzle. If the pressure of the nozzle exceeds the set value, after washing for a predetermined time during the reverse washing stage, it switches to the normal washing stage again; if the pressure of the nozzle does not exceed the set value, after washing for a predetermined time during the reverse washing stage, the reverse washing stage stops.

[0019] The features and advantages of the present invention will be disclosed in detail in the following specific embodiments and drawings. Brief Description of the Drawings

[0020] The present invention will be further described below in conjunction with the drawings and specific embodiments:

[0021] Figure 1 It is a schematic structural diagram of the printing and dyeing machine in Embodiment 1;

[0022] Figure 2 It is a schematic diagram of the cleaning liquid cleaning the printing and dyeing unit in the forward direction in Embodiment 1;

[0023] Figure 3 It is a schematic diagram of the cleaning liquid cleaning the printing and dyeing unit in the reverse direction in Embodiment 1;

[0024] Figure 4 It is a schematic diagram of the printing and dyeing unit in Embodiment 3.

[0025] Reference Signs:

[0026] 100, Controller;

[0027] 200, Liquid storage cylinder;

[0028] 300, Waste liquid cylinder;

[0029] 400, Printing and dyeing unit; 410, Nozzle; 420, Liquid supply pipeline; 421, First liquid supply pipeline; 422, Second liquid supply pipeline; 423, Liquid supply three-way valve; 4231, First switch valve; 4232, Second switch valve; 424, Bidirectional power pump; 425, Flow detection device; 430, Waste liquid pipeline; 431, First waste liquid pipeline; 432, Second waste liquid pipeline; 433, Waste liquid three-way valve; 4331, Third switch valve; 4332, Fourth switch valve; 434, Hydraulic gauge; 435, Waste liquid valve; 440, Second cleaning pipeline; 450, First cleaning pipeline;

[0030] 500, Liquid separation pipeline; 510, Filter device. Detailed implementation mode

[0031] A printing and dyeing machine proposed by the present invention includes a controller, a liquid storage tank, a waste liquid tank and a plurality of printing and dyeing units. The printing and dyeing units include nozzles for spraying dye liquor. The nozzles of the plurality of printing and dyeing units are arranged side by side. The printing and dyeing units further include: a liquid supply pipeline, including a first liquid supply pipeline, a second liquid supply pipeline and a liquid supply three-way valve. The first liquid supply pipeline is connected between the liquid storage tank and the liquid supply three-way valve. The second liquid supply pipeline is connected between the nozzle and the liquid supply three-way valve; a waste liquid pipeline, including a first waste liquid pipeline, a second waste liquid pipeline and a waste liquid three-way valve. The first waste liquid pipeline is connected between the nozzle and the waste liquid three-way valve. The second waste liquid pipeline is connected between the waste liquid three-way valve and the waste liquid tank; a cleaning pipeline, including a first cleaning pipeline and a second cleaning pipeline. The liquid storage tank and the waste liquid three-way valve are connected through the first cleaning pipeline. The waste liquid tank and the liquid supply three-way valve are connected through the second cleaning pipeline; a power source, which is arranged on the liquid supply pipeline and is electrically connected to the controller to pump the liquid in the liquid storage tank to the nozzle and the waste liquid tank. By setting a second cleaning pipeline on the printing and dyeing unit to connect the liquid supply three-way valve and the waste liquid tank, and setting a first cleaning pipeline to connect the waste liquid three-way valve and the liquid storage tank, the printing and dyeing machine can make the printing and dyeing unit have two cleaning waterways, forward and reverse cleaning, through the switching of the liquid supply three-way valve and the waste liquid three-way valve. When cleaning each printing and dyeing unit, the second liquid supply pipeline and the nozzle of the printing and dyeing unit can be cleaned forward (i.e., in the same direction as the flow direction of the dye liquor) to clean the dye liquor inside, and then the second liquid supply pipeline and the nozzle of the printing and dyeing unit can be cleaned reversely to clean the accumulated particles and other impurities inside. The cleaning effect on the printing and dyeing unit, especially the nozzle, is better, which is convenient for later color change and work, and avoids the accumulation of particles and other impurities in the nozzle and other structures of the printing and dyeing unit from affecting the work of the printing and dyeing machine, and prolongs the service life of the printing and dyeing machine.

[0032] The technical solutions of the embodiments of the present invention will be explained and described below with reference to the accompanying drawings of the embodiments of the present invention. However, the following embodiments are only the preferred embodiments of the present invention, not all of them. Based on the embodiments in the implementation mode, other embodiments obtained by those skilled in the art without creative efforts all belong to the protection scope of the present invention.

[0033] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0034] In addition, the terms "first" and "second" are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "a plurality of" is two or more, unless otherwise clearly defined.

[0035] In the present invention, unless otherwise clearly specified and defined, terms such as "mounted", "connected", "coupled", "fixed", etc. shall be construed in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] In the present invention, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the first feature has a lower horizontal height than the second feature.

[0037] Example 1:

[0038] A printing and dyeing machine, as Figures 1 to 3 shown, includes a controller 100, a liquid storage tank 200, a waste liquid tank 300, and a printing and dyeing unit 400( Figure 1(the part within the dashed box), there are multiple (two or more) printing and dyeing units 400, and each printing and dyeing unit 400 includes a nozzle 410, a liquid supply pipeline 420, a waste liquid pipeline 430, a cleaning pipeline, and a power source. The nozzles 410 of multiple printing and dyeing units 400 are arranged side by side for spraying dye solution. The liquid supply pipeline 420 is connected between the liquid storage tank 200 and the nozzle 410, and includes a first liquid supply pipeline 421, a second liquid supply pipeline 422, and a liquid supply three-way valve 423. The first liquid supply pipeline 421 is connected between the liquid storage tank 200 and the liquid supply three-way valve 423, and the second liquid supply pipeline 422 is connected between the liquid supply three-way valve 423 and the nozzle 410. By setting the liquid supply pipeline 420 as a split setting of the first liquid supply pipeline 421, the second liquid supply pipeline 422, and the liquid supply three-way valve 423, it is convenient for the installation and disassembly of the liquid supply pipeline 420 and the liquid supply three-way valve 423. When the first liquid supply pipeline 421 and the second liquid supply pipeline 422 are damaged, the first liquid supply pipeline 421 and the second liquid supply pipeline 422 can be replaced separately, reducing the maintenance cost. The waste liquid pipeline 430 is connected between the waste liquid tank 300 and the nozzle 410, and includes a first waste liquid pipeline 431, a second waste liquid pipeline 432, and a waste liquid three-way valve 433. The first waste liquid pipeline 431 is connected between the nozzle 410 and the waste liquid three-way valve 433, and the second waste liquid pipeline 432 is connected between the waste liquid three-way valve 433 and the waste liquid tank 300. By setting the waste liquid pipeline 430 as a split setting of the first waste liquid pipeline 431, the second waste liquid pipeline 432, and the waste liquid three-way valve 433, it is convenient for the installation and disassembly of the waste liquid pipeline 430 and the waste liquid three-way valve 433. When the first waste liquid pipeline 431 and the second waste liquid pipeline 432 are damaged, the first waste liquid pipeline 431 and the second waste liquid pipeline 432 can be replaced separately, reducing the maintenance cost. The cleaning pipeline includes a first cleaning pipeline 450 and a second cleaning pipeline 440. The waste liquid three-way valve 433 and the liquid storage tank 200 are connected through the first cleaning pipeline 450, and the liquid supply three-way valve 423 and the waste liquid tank 300 are connected through the second cleaning pipeline 440. The power source is arranged on the liquid supply pipeline 420 and is electrically connected to the controller 100 to extract the liquid in the liquid storage tank 200 to the nozzle 410 and the waste liquid tank 300.

[0039] When the printing and dyeing machine dyes the fabric, the liquid supply three-way valve 423 is switched to connect the first liquid supply pipeline 421 and the second liquid supply pipeline 422, and the waste liquid three-way valve 433 is switched to not connect with the nozzle 410, so that the dye solution stored in the liquid storage tank 200 flows through the first liquid supply pipeline 421, the liquid supply three-way valve 423, and the second liquid supply pipeline 422 to the nozzle 410 in sequence, and is sprayed on the fabric through the nozzle 410.

[0040] When the nozzle 410 of the printing and dyeing machine needs to be cleaned, the dye solution in the liquid storage cylinder 200 is replaced with a cleaning solution, and then the printing and dyeing unit 400 is first cleaned forward and then backward. That is, first switch the liquid supply three-way valve 423 to connect the first liquid supply pipeline 421 and the second liquid supply pipeline 422, and switch the waste liquid three-way valve 433 to connect the first waste liquid pipeline 431 and the second waste liquid pipeline 432. Then the power source works to extract the cleaning solution in the liquid storage cylinder 200, and the flow direction of the cleaning solution is as shown in Figure 2 the arrow. The cleaning solution in the liquid storage cylinder 200 sequentially flows through the first liquid supply pipeline 421, the second liquid supply pipeline 422, the nozzle 410, the first waste liquid pipeline 431 and the second waste liquid pipeline 432 into the waste liquid cylinder 300 to achieve forward cleaning of the printing and dyeing unit 400. Then, switch the waste liquid three-way valve 433 to connect the first cleaning pipeline 450 and the first waste liquid pipeline 431, and switch the liquid supply three-way valve 423 to connect the second liquid supply pipeline 422 and the second cleaning pipeline 440. Then the power source works to extract the cleaning solution in the liquid storage cylinder 200, and the flow direction of the cleaning solution is as shown in Figure 3 the arrow. The cleaning solution in the liquid storage cylinder 200 sequentially flows through the first cleaning pipeline 450, the first waste liquid pipeline 431, the nozzle 410, the second liquid supply pipeline 422 and the second cleaning pipeline 440 into the waste liquid cylinder 300 to achieve backward cleaning of the printing and dyeing unit 400.

[0041] Because when the printing and dyeing machine dyes fabrics, there will be some particulate matters in the dye solution flowing towards the nozzle 410 in the liquid supply pipeline 420. When these particulate matters pass through the uneven internal structures (such as steps) or components inside the nozzle 410 and other parts, they are extremely likely to be blocked and accumulate. In the present invention, a second cleaning pipeline 440 is provided on the printing and dyeing unit 400 to connect the liquid supply three-way valve 423 and the waste liquid cylinder 300, and a first cleaning pipeline 450 is provided to connect the waste liquid three-way valve 433 and the liquid storage cylinder 200, so that the printing and dyeing machine can switch the liquid supply three-way valve 423 and the waste liquid three-way valve 433, enabling the printing and dyeing unit 400 to have two cleaning water paths, forward cleaning and backward cleaning. When cleaning each printing and dyeing unit 400, the second liquid supply pipeline 422 and the nozzle 410 of the printing and dyeing unit 400 can be first cleaned forward (i.e., in the same direction as the flow direction of the dye solution) to clean the dye solution inside, and then the second liquid supply pipeline 422 and the nozzle 410 of the printing and dyeing unit 400 can be cleaned backward to clean the accumulated particulate matters and other impurities inside. The cleaning effect on the printing and dyeing unit 400, especially the nozzle 410, is better, which is convenient for later color change and operation, avoids the accumulation of particulate matters and other impurities in structures such as the nozzle 410 from affecting the operation of the printing and dyeing machine, and prolongs the service life of the printing and dyeing machine.

[0042] Preferably, in this embodiment, the first cleaning pipeline 450 is connected to the first liquid supply pipeline 421. The first cleaning pipeline 450 is communicated with the liquid storage cylinder 200 through the first liquid supply pipeline 421, so that the liquid storage cylinder 200 only needs to be connected to the first liquid supply pipeline 421 to realize the flow of the cleaning liquid inside it to the liquid supply three-way valve 423 or the waste liquid three-way valve 433, reducing the assembly difficulty between the printing and dyeing unit 400 and the liquid storage cylinder 200. The second cleaning pipeline 440 is connected to the second waste liquid pipeline 432. The second cleaning pipeline 440 is communicated with the waste liquid cylinder 300 through the second waste liquid pipeline 432, so that the waste liquid cylinder 300 only needs to be connected to the second waste liquid pipeline 432 to realize the collection of the cleaning liquid in the first waste liquid pipeline 431 and the second cleaning pipeline 440, reducing the assembly difficulty between the printing and dyeing unit 400 and the waste liquid cylinder 300. Of course, it can be understood that in other embodiments, only the first cleaning pipeline can be connected to the first liquid supply pipeline to enable the first cleaning pipeline to be communicated with the liquid storage cylinder through the first liquid supply pipeline; or only the second cleaning pipeline can be connected to the second waste liquid pipeline to enable the second cleaning pipeline to be communicated with the waste liquid cylinder through the second waste liquid pipeline.

[0043] In this embodiment, the power source is a two-way power pump 424. The two-way power pump 424 is arranged on the second liquid supply pipeline 422 to extract the liquid in the liquid storage cylinder 200. By arranging the two-way power pump 424 on the second liquid supply pipeline 422, during forward flushing and reverse flushing, the two-way power pump 424 can extract the liquid in the liquid storage cylinder 200. Only by arranging one two-way power pump 424 on each printing and dyeing unit 400 can printing and self-cleaning be realized, reducing the production cost. The two-way power pump 424 includes a forward liquid pump unit and a reverse liquid pump unit, and the forward liquid pump unit and the reverse liquid pump unit are connected in parallel. The forward liquid pump unit includes a first liquid pump arranged forward and a forward switch valve connected in series with the first liquid pump. The reverse liquid pump unit includes a second liquid pump arranged reversely and a reverse switch valve connected in series with the second liquid pump. When the printing and dyeing unit 400 is flushed forward, the forward switch valve is opened, the reverse switch valve is closed, and the first liquid pump works to extract the cleaning liquid in the liquid storage cylinder 200 forward to the waste liquid cylinder 300; when the printing and dyeing unit 400 is flushed reversely, the reverse switch valve is opened, the forward switch valve is closed, and the second liquid pump works to extract the cleaning liquid in the liquid storage cylinder 200 reversely to the waste liquid cylinder 300.

[0044] The liquid supply three-way valve 423 and the waste liquid three-way valve 433 in this embodiment can be selected from one of a three-way ball valve, a three-way cock, a three-way diaphragm valve, a three-way regulating valve, a three-way butterfly valve or a three-way globe valve to realize the switching of the water path by the rotation of the valve core.

[0045] A flow rate detection device 425 is also provided on the second liquid supply pipeline 422. The flow rate detection device 425 is arranged at one end of the second liquid supply pipeline 422 close to the nozzle 410. The flow rate detection device 425 is electrically connected to the controller 100, and can detect the flow rate of the nozzle 410 and feedback it to the controller 100. When the printing and dyeing unit 400 sprays the dyeing liquid, the controller 100 precisely controls the flow rates of the nozzles 410 of each printing and dyeing unit 400 to the same value, so that the amount of dyeing liquid sprayed onto the fabric by each nozzle 410 per unit time is the same, and thus the printing and dyeing of each position of the fabric is more uniform. Preferably, the flow rate detection device 425 is a flow meter. Using a flow meter with a relatively small volume as the flow rate detection device 425 greatly reduces the space occupied by the flow rate detection device 425. At the same time, the measurement accuracy is high, and the monitoring effect of the flow rate at the nozzle 410 is good.

[0046] In this embodiment, a waste liquid valve 435 for opening and closing the first waste liquid pipeline 431 is also provided on the first waste liquid pipeline 431. When the printing and dyeing machine works to print and dye the fabric, the waste liquid valve 435 is closed. When the printing and dyeing machine performs self-cleaning, the waste liquid valve 435 is opened. The setting of the waste liquid valve has a cutting-off effect on the first waste liquid pipeline 431. When the printing and dyeing machine prints and dyes the fabric, it prevents the dyeing liquid from impacting the waste liquid three-way valve 433, thereby avoiding the leakage of the dyeing liquid to the waste liquid tank 300 through the waste liquid three-way valve 433 and saving the dyeing liquid.

[0047] In this embodiment, a hydraulic pressure gauge 434 is also provided on the first waste liquid pipeline 431. The hydraulic pressure gauge 434 is located between the waste liquid valve 435 and the nozzle 410. The hydraulic pressure gauge 434 is located at the nozzle outlet and is electrically connected to the controller 100 to detect the pressure at the nozzle 410. When the printing and dyeing machine works to print and dye the fabric, the hydraulic pressure gauge 434 can detect the pressure at the nozzle 410 and transmit it to the controller 100. When the nozzle holes of the nozzle 410 are blocked, resulting in too high pressure at the nozzle 410, the hydraulic pressure gauge 434 can quickly feedback the detected pressure to the controller 100 to prompt the staff to clean or replace the nozzle 410, ensuring the stable spraying of the nozzle 410 on the fabric. Preferably, an alarm is also provided on the controller 100. When the hydraulic pressure gauge 434 detects that the pressure of the nozzle 410 exceeds the set pressure value, the alarm sounds to prompt the staff, so that the user can discover it in time and improve the use experience. Of course, it can be understood that in another embodiment, the hydraulic pressure gauge can also be arranged at the inlet of the nozzle on the second liquid supply pipeline to detect the pressure at the nozzle.

[0048] In this embodiment, the printing and dyeing machine further includes a liquid distribution pipeline 500. The liquid supply pipelines 420 of multiple printing and dyeing units 400 are connected to the same liquid storage tank 200 through the liquid distribution pipeline 500. That is, the liquid inlet end of the liquid distribution pipeline 500 is connected to the liquid storage tank 200, and multiple liquid outlet ends of the liquid distribution pipeline 500 are respectively connected to the liquid supply pipelines 420 of each printing and dyeing unit 400. The number of liquid storage tanks 200 is reduced, the internal structure of the printing and dyeing machine is simplified, and the production and processing difficulty is reduced. Of course, it can be understood that in other embodiments, multiple liquid storage tanks can also be provided, and the number of liquid storage tanks is the same as the number of printing and dyeing units. The liquid supply pipelines of multiple printing and dyeing units are connected to the liquid storage tanks in one-to-one correspondence. By placing different colored dye solutions in different liquid storage tanks, synchronous spraying of multiple colors can be achieved.

[0049] Preferably, in this embodiment, a filtering device 510 is provided on the liquid distribution pipeline 500. By arranging the filtering device 510 on the liquid distribution pipeline 500, a single filtering device 510 can filter the dye solution entering all the printing and dyeing units 400, preventing large particles in the dye solution from entering the printing and dyeing units 400 and causing wear or blockage, and prolonging the service life of the printing and dyeing units 400 (especially the nozzles 410).

[0050] Embodiment Two:

[0051] The difference between this embodiment and Embodiment One is that in this embodiment, the printing and dyeing unit further includes a droplet optical imaging detection device electrically connected to the controller. The droplet optical imaging detection device is arranged at the nozzle to detect the dye solution droplets ejected from the nozzle. When the droplet optical imaging detection device detects that the dye solution droplets are not within the set range (the droplets are larger or smaller than the set range) during the printing and dyeing process, the alarm gives an alarm. The droplet optical imaging detection device monitors the shape and size of the droplets, which is more accurate and reliable.

[0052] Embodiment Three:

[0053] The difference between this embodiment and Embodiment One is that as Figure 4 shown, in this embodiment, the liquid supply three-way valve includes a first switch valve 4231 and a second switch valve 4232. The first switch valve 4231 is connected between the first liquid supply pipeline 421 and the second liquid supply pipeline 422, and the second switch valve 4232 is connected between the second liquid supply pipeline 422 and the second cleaning pipeline 440; the waste liquid three-way valve includes a third switch valve 4331 and a fourth switch valve 4332. The third switch valve 4331 is connected between the first waste liquid pipeline 431 and the second waste liquid pipeline 432, and the fourth switch valve 4332 is connected between the first waste liquid pipeline 431 and the first cleaning pipeline 450.

[0054] When the printing and dyeing unit is being cleaned forward, the first switching valve 4231 is opened, and the second switching valve 4232 is closed, so that the first liquid supply pipeline 421 is communicated with the second liquid supply pipeline 422. The third switching valve 4331 is opened, and the fourth switching valve 4332 is closed, so that the first waste liquid pipeline 431 is communicated with the second waste liquid pipeline 432.

[0055] When the printing and dyeing unit is being cleaned backward, the fourth switching valve 4332 is opened, the third switching valve 4331 is closed, the first waste liquid pipeline 431 is communicated with the first cleaning pipeline 450, the second switching valve 4232 is opened, and the first switching valve 4231 is closed, so that the second liquid supply pipeline 422 is communicated with the second cleaning pipeline 440.

[0056] In this embodiment, by setting the liquid supply three-way valve into a structure combined with the first switching valve 4231 and the second switching valve 4232, and setting the waste liquid three-way valve into a structure combined with the third switching valve 4331 and the fourth switching valve 4332, the second liquid supply pipeline 422 is communicated with or interrupted from the first liquid supply pipeline 421 and the second cleaning pipeline 440 respectively through two switching valves. The second waste liquid pipeline 432 is communicated with or interrupted from the second waste liquid pipeline 432 and the first cleaning pipeline 450 respectively through two switching valves. Each water circuit is independently controlled through different switching valves, which is more stable and reliable. Preferably, the first switching valve 4231, the second switching valve 4232, the third switching valve 4331 and the fourth switching valve 4332 in this embodiment adopt solenoid valves.

[0057] Embodiment 4:

[0058] A self-cleaning method for a printing and dyeing machine, using the printing and dyeing machine in Embodiment 1 for self-cleaning. The self-cleaning method includes the following steps:

[0059] In the preparation stage, cleaning liquid is injected into the liquid storage tank 200, and the waste liquid valve 435 is opened.

[0060] In the forward cleaning stage, the liquid supply three-way valve 423 is switched to connect the first liquid supply pipeline 421 and the second liquid supply pipeline 422. The waste liquid three-way valve 433 is switched to connect the first waste liquid pipeline 431 and the second waste liquid pipeline 432. The two-way power pump 424 rotates forward to extract the cleaning liquid in the liquid storage tank 200 through the first liquid supply pipeline 421, the second liquid supply pipeline 422, the spray head 410, the first waste liquid pipeline 431 and the second waste liquid pipeline 432 to the waste liquid tank 300, as Figure 2 shown by the arrow direction, to clean the printing and dyeing unit forward. At the same time, the flow detection device 425 detects the flow rate of the cleaning liquid flowing to the spray head 410. After cleaning for a predetermined time at a predetermined flow rate in the forward cleaning stage, it is switched to the reverse cleaning stage;

[0061] During the backwashing stage, the liquid supply three-way valve 423 is switched to connect the second cleaning pipeline 440 with the second liquid supply pipeline 422, and the waste liquid three-way valve 433 is switched to connect the first cleaning pipeline 450 with the first waste liquid pipeline 431. The bidirectional power pump 424 rotates in the reverse direction to draw the cleaning liquid in the liquid storage cylinder 200 into the waste liquid cylinder 300 through the first liquid supply pipeline 421, the first cleaning pipeline 450, the first waste liquid pipeline 431, the spray head 410, the second liquid supply pipeline 422, the second cleaning pipeline 440 and the second waste liquid pipeline 432, as Figure 3 shown by the arrow direction, so as to perform reverse cleaning on the printing and dyeing unit. At the same time, the hydraulic gauge 434 detects the pressure at the spray head 410. If the pressure at the spray head 410 exceeds the set value, it means that the blockage at the spray head 410 has not been completely cleared. After the backwashing stage is cleaned for a predetermined time, it is switched back to the normal washing stage again; if the pressure at the spray head 410 does not exceed the set value, after the backwashing stage is cleaned for a predetermined time, the backwashing stage stops.

[0062] The above are only the preferred embodiments of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions falling within the concept of the present invention belong to the protection scope of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A dyeing machine, comprising a controller, a liquid storage tank, a waste liquid tank and a plurality of dyeing units, wherein the dyeing units comprise nozzles for spraying dye liquid, and the nozzles of the plurality of dyeing units are arranged side by side, characterized in that: The printing and dyeing unit also includes: A liquid supply pipeline, comprising a first liquid supply pipeline, a second liquid supply pipeline and a liquid supply three-way valve, wherein the first liquid supply pipeline is connected between the liquid storage cylinder and the liquid supply three-way valve, and the second liquid supply pipeline is connected between the spray head and the liquid supply three-way valve; A waste liquid pipeline, comprising a first waste liquid pipeline, a second waste liquid pipeline and a waste liquid three-way valve, wherein the first waste liquid pipeline is connected between the nozzle and the waste liquid three-way valve, and the second waste liquid pipeline is connected between the waste liquid three-way valve and the waste liquid tank; A cleaning pipeline, comprising a first cleaning pipeline and a second cleaning pipeline, the liquid storage cylinder and the waste liquid three-way valve are connected through the first cleaning pipeline, and the waste liquid cylinder and the liquid supply three-way valve are connected through the second cleaning pipeline; The power source is arranged on the liquid supply pipeline and is electrically connected to the controller so as to extract the liquid in the liquid storage cylinder to the nozzle and the waste liquid cylinder.

2. A printing and dyeing machine according to claim 1, characterized in that: The first cleaning pipeline is connected to the first liquid supply pipeline to communicate with the liquid storage cylinder through the first liquid supply pipeline; and / or the second cleaning pipeline is connected to the second waste liquid pipeline to communicate with the waste liquid cylinder through the second waste liquid pipeline.

3. A printing and dyeing machine according to claim 1, characterized in that: The power source is a bidirectional power pump, and the bidirectional power pump is arranged on the second liquid supply pipeline.

4. A printing and dyeing machine according to claim 3, characterized in that: The bidirectional power pump includes a forward liquid pump unit and a reverse liquid pump unit connected in parallel with the forward liquid pump unit; the forward liquid pump unit includes a first liquid pump set in the forward direction and a forward switching valve connected in series with the first liquid pump, and the reverse liquid pump unit includes a second liquid pump set in the reverse direction and a reverse switching valve connected in series with the second liquid pump.

5. A printing and dyeing machine according to claim 1, characterized in that: The first waste liquid pipeline is provided with a waste liquid valve for opening and closing the first waste liquid pipeline.

6. A printing and dyeing machine according to claim 5, characterized in that: The first waste liquid pipeline is also provided with a hydraulic gauge for detecting the pressure at the nozzle, and the hydraulic gauge is arranged between the waste liquid valve and the nozzle, and is electrically connected to the controller; or, the second liquid supply pipeline is also provided with a hydraulic gauge for detecting the pressure at the nozzle, and the hydraulic gauge is electrically connected to the controller.

7. A printing and dyeing machine according to claim 6, characterized in that: The controller is also provided with an alarm, and when the hydraulic pressure gauge detects that the pressure of the nozzle exceeds a set value, the alarm sounds an alarm.

8. A printing and dyeing machine according to claim 1, characterized in that: An alarm is also provided on the first waste liquid pipeline, and the printing and dyeing unit also includes a droplet optical imaging detection device electrically connected to the controller. The droplet optical imaging detection device is arranged at the nozzle to detect the dye droplets sprayed out of the nozzle. When the droplet optical imaging detection device detects that the dye droplets are not within a set range during the printing and dyeing process, the alarm sounds an alarm.

9. A printing and dyeing machine according to claim 1, characterized in that: The printing and dyeing machine also includes a liquid separation pipeline, and the liquid supply pipelines of multiple printing and dyeing units are connected to the same liquid storage cylinder through the liquid separation pipeline; or, the liquid storage cylinder is provided with multiple liquid supply pipelines of multiple printing and dyeing units and multiple liquid storage cylinders are connected one by one.

10. A printing and dyeing machine according to claim 1, characterized in that: The liquid supply three-way valve includes a first switch valve and a second switch valve, the first switch valve is connected between the first liquid supply pipeline and the second liquid supply pipeline, and the second switch valve is connected between the second liquid supply pipeline and the second cleaning pipeline; the waste liquid three-way valve includes a third switch valve and a fourth switch valve, the third switch valve is connected between the first waste liquid pipeline and the second waste liquid pipeline, and the fourth switch valve is connected between the first waste liquid pipeline and the first cleaning pipeline.

11. A self-cleaning method for a printing and dyeing machine, characterized in that: Using the printing and dyeing machine in claim 1, the self-cleaning method comprises the following steps: In the preparatory stage, the cleaning liquid is injected into the liquid storage tank; In the forward washing stage, the liquid supply three-way valve is switched to connect the first liquid supply pipeline with the second liquid supply pipeline, and the waste liquid three-way valve is switched to connect the first waste liquid pipeline with the second waste liquid pipeline. The power source rotates forward to draw the cleaning liquid in the liquid storage tank into the waste liquid tank, so as to perform forward washing on the printing and dyeing unit; During the backwash stage, the liquid supply three-way valve is switched to connect the second cleaning pipeline with the second liquid supply pipeline, and the waste liquid three-way valve is switched to connect the first cleaning pipeline with the first waste liquid pipeline. The power source rotates in the reverse direction to draw the cleaning liquid in the liquid storage tank into the waste liquid tank to reversely clean the printing and dyeing unit.

12. A self-cleaning method for a printing and dyeing machine according to claim 11, characterized in that: The first waste liquid pipeline is provided with a waste liquid valve for opening and closing the first waste liquid pipeline. In the preparatory stage, the waste liquid valve is opened.

13. The self-cleaning method of a printing and dyeing machine according to claim 11, characterized in that: A flow detection device is provided on the second liquid supply pipeline. In the forward washing stage, the flow detection device detects the flow of the cleaning liquid flowing to the nozzle. After the forward washing stage is washed at a predetermined flow rate for a predetermined time, it switches to the backwash stage.

14. A self-cleaning method for a printing and dyeing machine according to claim 13, characterized in that: A hydraulic gauge is provided on the first waste liquid pipeline or the second liquid supply pipeline. During the backwash stage, the hydraulic gauge detects the pressure at the nozzle. If the pressure of the nozzle exceeds the set value, the backwash stage is switched to the forward wash stage again after the predetermined time of cleaning; if the pressure of the nozzle does not exceed the set value, the backwash stage is stopped after the predetermined time of cleaning.

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