Method for determining and controlling optimal running water level of overflow dyeing machine

Abstract

The overflow dyeing machine optimal operation water level determination and control method, propose a new type of dyeing optimal operation water level determination and control means, in order to be able to according to the printing and dyeing process in the printing and dyeing process, according to the structure and principle of overflow dyeing machine, realize the modeling and process control of optimal operation water level determination and control method, so as to realize the dyeing liquid color concentration to meet the process requirements, achieve the uniformity and stability of fabric color, at the same time, significantly save water, electricity, steam consumption, improve dyeing efficiency and reduce production cost. Including the following execution process: 1), confirmation process of water quantity below inner wall; 2), confirmation process of water quantity of full pipeline and related equipment during operation; 3), main pump minimum water level determination process; 4), confirmation process of dyeing fabric moisture content; 5), optimal water level operation control process.

Description

TECHNICAL FIELD

[0001] The application provides a method for determining and controlling optimal running water level in a dyeing process of an overflow dyeing machine, and belongs to the technical field of printing and dyeing equipment. BACKGROUND

[0002] At present, overflow dyeing equipment is generally used in the domestic fabric printing and dyeing industry to perform pretreatment and dyeing on various knitted fabrics such as pure cotton, pure polyester, polyester-cotton and spandex, and is particularly suitable for dyeing of new synthetic fibers and super-fine fibers with high added value, and can also be used for fabric scouring, bleaching, preshrinking, alkali reduction and other processes.

[0003] The overflow dyeing machine is a widely used machine type in intermittent dyeing and finishing projects. Both imported machines and domestic machines play their respective positive roles in the dyeing and finishing projects of polyester and its blended fabrics. Since the overflow dyeing machine can perform dyeing processing on almost all woven and knitted fabrics, most of the textiles for export and domestic sale are dyed from the overflow dyeing machine. The working principle of the overflow dyeing machine is to draw the dyeing liquid from the bottom of the dyeing tank through the main pump, send it to the heat exchanger for heating, and then enter the overflow tank at the front end of the dyeing tank. Two or more downwardly inclined overflow pipes are arranged in parallel in the overflow tank. The fabric is driven to circulate by the driving guide roller and the dyeing liquid overflow.

[0004] Fabric printing and dyeing is a complex process affected by multiple factors, and multiple factors are coupled and jointly act, so that it is difficult to control the dyeing quality. There are many main factors affecting the dyeing quality of the overflow dyeing machine, such as dyeing liquid and adding method, dyeing temperature, types and amounts of salt and alkali agents, dyeing time, and dyeing bath ratio. The dyeing process must meet the process requirements in terms of color concentration, adding time and temperature of the dyeing liquid, otherwise, defects such as color difference, vat difference and uneven coloring will occur.

[0005] In the overflow dyeing process of the prior art, the dyed fabric continuously circulates in the loop formed by the lifting wheel, nozzle, guide pipe and dyeing tank to achieve continuous dyeing. Under the premise of ensuring the dyeing quality, how to control the water consumption to save materials, water, electricity, steam and other current major problems urgently need to be solved. The existing dyeing process has a large amount of water consumption and no control, and the dyeing concentration is not enough, so the dye and the additive are increased for adjustment. In order to achieve good dyeing effect, a large bath ratio is required, which not only consumes a lot of energy and has high production cost, but also requires more financial resources to treat a large amount of printing and dyeing wastewater.

[0006] Therefore, the present application is proposed. SUMMARY

[0007] The overflow dyeing machine optimal operation water level determination and control method provided by the application solves the problems in the prior art and provides a novel dyeing optimal operation water level determination and control means, so that the optimal operation water level determination and control method can be modeled and process controlled according to the requirements of the printing and dyeing process on the dyeing agent bath ratio and according to the structure and principle of the overflow dyeing machine, so as to realize the dyeing liquid color concentration meeting the process requirements, the uniformity and stability of fabric coloration, the significant saving of water, electricity and steam, and the improvement of dyeing efficiency and the reduction of production cost.

[0008] To achieve the above design purpose, the overflow dyeing machine optimal operation water level determination and control method comprises the following execution processes.

[0009] 1), confirmation process of water amount below inner wall

[0010] Supposing that the radius of the dyeing agent cylinder is r3, the water amount added is V0:

[0011]

[0012] In the formula, V0 is the water amount required to be added when the water level reaches the bottom of the dyeing tank, and the unit is m 3 ;

[0013] r3 is the radius of the cylinder, and the unit is m;

[0014] H is the liquid level reduction amount of the cylinder, and the unit is m;

[0015] p2 is the indication value of the cylinder liquid level meter, and the unit is %;

[0016] 2), confirmation process of water amount of full pipeline and related equipment during operation

[0017] Sufficient water is added to the dyeing tank 1, and the water amount V3 in the dyeing tank is measured;

[0018] The main pump is started, and water circulates in the overflow dyeing machine, and when the work is stable, the water amount in the dyeing tank is V4;

[0019] The water amount V5 of full pipeline and related equipment during operation is:

[0020] V5 = V3-V4 (18)

[0021] 3), main pump minimum water level determination process

[0022] Sufficient water is added to the dyeing tank, and the main pump is started to make water circulate in the overflow dyeing machine;

[0023] When the work is stable, the drain valve is opened, and when the main pump just appears insufficient water, the drain valve is closed, and the water amount V6 in the dyeing tank at this time is recorded;

[0024] 4) Dyeing fabric water content confirmation process

[0025] Add enough water to the dyeing tank, and record the water amount in the dyeing tank as V7;

[0026] Start the main pump and the guide roller, and make the water circulate in the overflow dyeing machine; keep the running state, so that the dyed fabric is fully soaked in the dyeing tank;

[0027] When the work is stable, stop the main pump and the guide roller, and record the water amount in the dyeing tank at this time V8, then the water content V9 of the dyed fabric during running is:

[0028] V9 = V7 - V8 (19)

[0029] 5) Optimal water level running control process

[0030] Calculate the water amount V0 needed to reach the bottom of the dyeing tank, the water amount V5 needed to fill the pipeline and related equipment, the minimum water amount V6 needed to ensure running, and the sum of the water content V9 of the dyed fabric, and the calculation result is the minimum water amount needed to ensure running;

[0031] Take the minimum water amount needed to ensure running as the optimal water level and water amount value, inject water in the dyeing tank according to the minimum water amount, and determine the liquid level at this time;

[0032] According to the process requirements, dyeing is carried out, when the liquid level is less than the above water amount, open the water supplement valve to supplement water; when the liquid level is greater than the above water amount, close the water supplement valve;

[0033] In this way, the dyeing process is always running in the optimal water level state.

[0034] Further, it further includes the following mathematical model for establishing the liquid level and the dyeing liquid amount of the dyeing tank:

[0035] Suppose that a layer of Teflon tube with a radius of r2 is laid at the bottom of the dyeing tank, and the actual water amount should be removed from the volume V1 of the Teflon tube, then:

[0036]

[0037] In the above formula, C is the length of the submerged part of the Teflon tube, in units of m;

[0038] r1 is the radius of the Teflon tube arc, in units of m;

[0039] Then the cross-sectional area of the Teflon tube is:

[0040]

[0041] In the above formula, S4 is the cross-sectional area of the Teflon tube, in units of m 2 ;

[0042] r2 is the radius of the tetrafluoro tube, in meters;

[0043] The radius of the tetrafluoro tube arc is:

[0044] r1 = r - r2 (10)

[0045] Suppose that a layer of tetrafluoro tube with a radius of r2 is laid at the bottom of the dye vat, and there are n in total, then:

[0046]

[0047] The volume of the tetrafluoro tube at the bottom of the dye vat is:

[0048]

[0049] In the above formula, n is the number of tetrafluoro tubes laid;

[0050] V1 is the volume of the tetrafluoro tube immersed in the dye liquid at the bottom of the dye vat, in meters 3 ;

[0051] The actual water volume when the dye vat liquid level is h is:

[0052]

[0053] In the above formula, V2 is the actual volume of the dye liquid in the dye vat, in meters 3 ;

[0054] From this, the relationship between the indication value of the liquid level meter and the liquid level of the dye vat can be obtained.

[0055] Further, set the maximum liquid level measured by the liquid level meter as hymax, corresponding to the indication value of the liquid level meter 100%, and the minimum liquid level as "0", corresponding to the indication value of the liquid level meter 0%, and set the indication of the liquid level meter as p, then the actual liquid level height hy is:

[0056] hy = p hy / 100 (14) max

[0057] When measuring the liquid level of the dye vat using the dye vat liquid level meter, the "zero" scale of the dye vat liquid level meter is flush with the bottom of the dye vat, so the actual liquid level of the dye vat and the measured liquid level of the dye vat liquid level meter differ by the wall thickness of the dye vat;

[0058] According to formula (14), we have:

[0059] h = hy - τ = p hy / 100 - τ (15) max

[0060] In the above formula, hy is the liquid level measured by the liquid level meter, in meters;

[0061] ​​τ is the wall thickness of the dyeing tank material, unit is m.

[0062] As described above, the overflow dyeing machine optimal operation water level determination and control method has the advantages that, on the premise of meeting the requirements of dyeing process, the dyeing agent dosage is less, and the energy is saved. On the one hand, by determining the water content of the dyed fabric, the water consumption of the pipeline and the related equipment, and the minimum water consumption for ensuring the operation of the main pump, etc. to determine the dyeing tank liquid level, the real-time monitoring in the operation process is realized, and the color concentration of the dyeing liquid can effectively meet the process requirements, and the uniformity and stability of the dyeing of the fabric are achieved. On the other hand, according to the equipment structure and the equipment operation state, the minimum water consumption for ensuring the normal operation of the main pump is ensured, the dyeing agent cylinder liquid level is used to calibrate the zero position of the dyeing tank, and the amount of water in the dyeing tank is calculated by measuring the size of the dyeing tank liquid level value by using a mathematical model, so as to facilitate the control in actual operation. Therefore, the application can realize the minimum water consumption of the system in the dyeing process, and correspondingly reduce the amount of dyeing agent, water, electricity, steam and other materials, significantly reduce the subsequent treatment of printing and dyeing wastewater, and greatly save the overall operation and production cost of overflow dyeing. BRIEF DESCRIPTION OF DRAWINGS

[0063] Figure 1 is the structure principle diagram of the overflow dyeing machine applying the method described in the application;

[0064] Figure 2-1 and Figure 2-2 are schematic diagrams of different perspectives of the dyeing tank cross section and length respectively;

[0065] Figure 3 is a relative liquid level measurement schematic diagram of the dyeing agent cylinder;

[0066] In the above drawings, 1 is a dyeing tank, 2 is a dyed fabric, 3 is a guide roller, 4 is a dyeing agent atomization adding device, 5 is a dyeing liquid control valve, 6 is an atomization nozzle, 7 is a heat exchanger, 8 is a coarse dyeing agent valve, 9 is a fine dyeing agent valve, 10 is a dyeing agent cylinder, 11 is a circulating valve, 12 is a feeding pump, 13 is a discharge valve, 14 is a main pump, 15 is a cylinder liquid level meter, 16 is a dyeing tank liquid level meter, and 17 is a dyeing agent (or water). DETAILED DESCRIPTION

[0067] The application will be further described below in combination with the drawings and examples.

[0068] Example 1, the application provides an overflow dyeing machine optimal operation water level determination and control method, in which the dyeing agent bath ratio value is determined according to the printing and dyeing process in the printing and dyeing process, and the following modeling design and process control are carried out according to the structure and principle of the overflow dyeing machine.

[0069] Specifically, as Figure 1As shown, the dyeing agent atomization adding device 4 is arranged at the vertical upper part of the dyeing tank 1 below the vertical side of the atomization nozzle 6, and the dyeing agent is sprayed in mist from the atomization nozzle 6 downward.

[0070] The dyeing agent is uniformly sprayed to the dyeing liquid at the bottom of the dyeing tank 1 under the action of gravity, and the dyeing agent and the dyeing liquid are fully mixed through mixing and stirring, so that the concentration of the dyeing liquid in the dyeing tank 1 is kept uniform.

[0071] The optimal operation water level determination and control method of the overflow dyeing machine comprises the following execution steps:

[0072] 1) Establish a mathematical model of the dyeing tank liquid level and the dyeing liquid amount

[0073] As shown in Fig. 2, the dyeing tank cross section and length, and the dyeing liquid are compared, and a mathematical model of the dyeing tank liquid level and the dyeing liquid amount is established as the basis for liquid level control and dyeing liquid amount control.

[0074] Suppose the inner diameter of the dyeing tank cross section is r, the length is L, and the liquid level is h, then the cross section area of the dyeing tank is:

[0075] S = π·r 2 (1)

[0076] In the formula, r is the inner diameter of the dyeing tank cross section, with the unit of m;

[0077] S is the area of the dyeing tank cross section, with the unit of m 2 ;

[0078] Therefore, the area of the sector OAB is:

[0079]

[0080] In the formula, β is half of the central angle of the sector, with the unit of °;

[0081] S1 is the area of the liquid level and the circular sector, with the unit of m 2 ;

[0082] Since OE is perpendicular to AB, we have:

[0083]

[0084]

[0085] In the formula, h is the height of the dyeing liquid in the dyeing tank, with the unit of m;

[0086] Since the triangle OAB is an isosceles right triangle, EB is half of the base:

[0087]

[0088] The area S2 of the triangle OAB is:

[0089]

[0090] In the above formula, S2 is the area of the fan-shaped dye solution-free part, with the unit of m 2 ;

[0091] As shown in Fig. 2, the area S3 occupied by the dye solution part satisfies the following condition:

[0092]

[0093] The volume of the arc-shaped dye solution part cylinder is:

[0094]

[0095] In the above formula, L is the length of the dye vat, with the unit of m;

[0096] V is the volume of the dye solution in the dye vat, with the unit of m 3 ;

[0097] As shown in Figure 1 and Fig. 2, the overflow dyeing machine is provided with a layer of Teflon tube with a radius of r2 at the bottom of the dye vat 1, so the actual water consumption should be reduced by the volume V1 of the Teflon tube. Specifically, the volume of the Teflon tube is the part submerged by the dye solution, and since the Teflon tube is an arc length, it has:

[0098]

[0099] In the above formula, C is the length of the part of the Teflon tube submerged by the dye solution, with the unit of m;

[0100] r1 is the radius of the Teflon tube arc, with the unit of m;

[0101] The size of β can be obtained from the above formula (3);

[0102] The cross-sectional area of the Teflon tube is:

[0103]

[0104] In the above formula, S4 is the cross-sectional area of the Teflon tube, with the unit of m 2 ;

[0105] r2 is the radius of the Teflon tube, with the unit of m;

[0106] The radius of the Teflon tube arc is:

[0107] r1 = r - r2 (10)

[0108] Suppose that there are n Teflon tubes with a radius of r2 laid at the bottom of the dye vat 1, then:

[0109]

[0110] The volume of the four-fluorine tube at the bottom of the dyeing tank is:

[0111]

[0112] In the above formula, n is the number of four-fluorine tubes laid;

[0113] V1 is the volume of the four-fluorine tube immersed in the dyeing liquid at the bottom of the dyeing tank, in units of m 3 ;

[0114] The actual water volume when the liquid level of the dyeing tank is h is:

[0115]

[0116] In the above formula, V2 is the actual volume of the dyeing liquid in the dyeing tank, in units of m 3 ;

[0117] Therefore, the relationship between the indication value of the liquid level meter and the liquid level of the dyeing tank is:

[0118] The maximum liquid level measured by the liquid level meter is hy max , corresponding to the indication value of 100% of the liquid level meter, and the minimum liquid level is "0", corresponding to the indication value of 0% of the liquid level meter. Assuming that the indication of the liquid level meter is p, then the actual liquid level height is hy is:

[0119] hy = p hy max / 100 (14)

[0120] The liquid level of the dyeing tank 1 is measured by the dyeing tank liquid level meter 16. During installation, the "zero" scale of the dyeing tank liquid level meter 16 is flush with the bottom of the dyeing tank 1, so the actual liquid level of the dyeing tank 1 differs from the measured liquid level of the dyeing tank liquid level meter 16 by the wall thickness of the dyeing tank 1.

[0121] According to formula (14), we have:

[0122] h = hy - τ = p hy max / 100 - τ (15)

[0123] In the above formula, hy is the liquid level measured by the liquid level meter, in units of m;

[0124] τ is the wall thickness of the dyeing tank material, in units of m;

[0125] 2) Confirmation process of the water volume below the inner wall

[0126] For example Figure 1 and Figure 3As shown, some pipes, valves and other devices are arranged at the bottom of the dyeing tank 1, and the space occupied by these devices is not included in the water volume of the dyeing tank, so the water volume of this part should be determined in advance.

[0127] Specifically, first fill the dyeing agent tank with water, so that the tank level meter indicates 100%;

[0128] Then, open the feeding pump and the feeding valve to add water to the dyeing tank, and stop when the dyeing tank level meter indicates a value p1 corresponding to τ;

[0129] p1 = 100 τ / hy max

[0130] Subsequently, the dyeing agent tank level is lowered to H, and the tank level meter indicates a value p2:

[0131]

[0132] In the above formula, H is the amount of reduction of the tank level, and the unit is m;

[0133] p2 is the tank level meter indication value, and the unit is %;

[0134] Let the radius of the dyeing agent tank be r3, then the amount of water added is V0:

[0135]

[0136] In the above formula, V0 is the amount of water that needs to be added to reach the bottom of the dyeing tank, and the unit is m 3 ;

[0137] r3 is the radius of the tank, and the unit is m;

[0138] 3) Confirmation process of water volume for filling pipes and related equipment during operation

[0139] First, add enough water to the dyeing tank 1, at this time the dyeing tank level meter indicates a value p3, and the water volume in the dyeing tank is calculated by the above formula (13), formula (15) and formula (17) V3;

[0140] Then, start the main pump to make the water circulate in the overflow dyeing machine; when the operation is stable, record the dyeing tank level meter indication value p4 at this time, and the water volume in the dyeing tank is calculated by the above formula (13), formula (15) and formula (17) V4;

[0141] Then, start the main pump to make the water circulate in the overflow dyeing machine; when the operation is stable, record the dyeing tank level meter indication value p4 at this time, and the water volume in the dyeing tank is calculated by the above formula (13), formula (15) and formula (17) V4;

[0142] V5 = V3 - V4 (18)

[0143] In the above formula, V5 is the water volume to fill the pipeline and related equipment, unit: m 3 ;

[0144] 4) The process of determining the minimum water level of the main pump

[0145] First, add enough water to the dyeing tank; start the main pump to make the water circulate in the overflow dyeing machine;

[0146] When the work is stable, open the drain valve; when the main pump reaches the critical point, that is, when the main pump just appears to be insufficient water, close the drain valve, and record the value indicated by the dyeing tank liquid level meter at this time as p5. At this time, the water volume in the dyeing tank is V6, which is obtained from the above formula (13), formula (15), and formula (17). Then the minimum water volume during operation is guaranteed to be V6.

[0147] 5) The process of confirming the water content of the dyed fabric

[0148] First, add enough water to the dyeing tank; at this time, the value indicated by the dyeing tank liquid level meter is p6, and the water volume in the dyeing tank is V7, which is obtained from the above formula (13), formula (15), and formula (17);

[0149] Then, start the main pump 14 and the fabric guide wheel 3 to make the water circulate in the overflow dyeing machine; keep the running state so that the dyed fabric 2 can be fully soaked in the dyeing tank 1;

[0150] When the work is stable, stop the main pump 14 and the fabric guide wheel 3, and after a period of time (such as 5 minutes), record the value indicated by the dyeing tank liquid level meter at this time as p7. At this time, the water volume in the dyeing tank is V8, which is obtained from the above formula (13), formula (15), and formula (17). Then the water content V9 of the dyed fabric during operation is:

[0151] V9 = V7 - V8 (19)

[0152] In the above formula, V9 is the water content of the dyed fabric, unit: m 3 ;

[0153] Using the same operation steps as above, different fabric water contents can be measured under the premise of replacing different dyed fabrics 2.

[0154] 6) The process of optimal water level operation control

[0155] Calculate the water volume V0 that needs to be added to reach the bottom of the dyeing tank, the water volume V5 to fill the pipeline and related equipment, the minimum water volume V6 to guarantee operation, and the sum of the water content V9 of the dyed fabric. The calculation result is the minimum water volume to guarantee operation;

[0156] The optimal water level and water volume value are the minimum water volume to guarantee operation. Inject water into the dyeing tank 1 according to this minimum water volume to determine the liquid level at this time;

[0157] The dyeing is carried out according to the process requirements, the water supplement valve is opened to supplement water when the liquid level is less than the above-mentioned water consumption, and the water supplement valve is closed when the liquid level is greater than the above-mentioned water consumption; the cycle is repeated, and the dyeing process is always operated in the optimal liquid level state.

[0158] As described above, the content of the scheme given in combination with the drawings and the description can derive similar technical solutions. Any scheme content that does not deviate from the structure of the present application still belongs to the scope of the technical solutions of the present application.

Claims

1. A method for determining and controlling optimum running water level of an overflow dyeing machine, characterized in that: The execution process comprises the following steps, 1) Confirming process of water amount less than inner wall Let the radius of the dyeing agent cylinder be r3, the water amount added be V0: （17） In the above formula, V0 is the amount of water needed to reach the bottom of the dyeing tank, with units of m 3 ; r3 is the radius of the cylinder, unit: m; H is the liquid level reduction, unit: m; 2) Confirming process of water amount for filling pipeline and related equipment during operation Add water to the dyeing tank (1), and measure the water amount V3 in the dyeing tank; Start the main pump to make the water circulate in the overflow dyeing machine, and when the operation is stable, the water amount in the dyeing tank is V4; The water amount V5 for filling pipeline and related equipment during operation is: （18） 3) Confirming process of the lowest water level of the main pump Add water to the dyeing tank, and start the main pump to make the water circulate in the overflow dyeing machine; When the operation is stable, open the water discharge valve, and when the main pump just appears water shortage, close the water discharge valve, and record the water amount V6 in the dyeing tank at this time; 4) Confirming process of the water amount of the dyed fabric Add water to the dyeing tank, and record the water amount V7 in the dyeing tank; Start the main pump and the fabric guide wheel to make the water circulate in the overflow dyeing machine, and keep the operation state to make the dyed fabric be fully soaked in the dyeing tank; When the operation is stable, stop the main pump and the fabric guide wheel, and then record the water amount V8 in the dyeing tank at this time, and the water amount V9 of the dyed fabric during operation is: （19） 5) Optimal water level operation control process Calculate the sum of the water amount V0 needed to be added to reach the bottom of the dyeing tank, the water amount V5 for filling pipeline and related equipment, the lowest water amount V6 for guaranteeing operation, and the water amount V9 of the dyed fabric, and the calculation result is the lowest water amount for guaranteeing operation; Take the lowest water amount for guaranteeing operation as the optimal water level and water amount value, inject water in the dyeing tank according to the lowest water amount, and determine the liquid level at this time; According to the process requirement, carry out dyeing, when the liquid level is less than the above water amount, open the water supplement valve to supplement water, and when the liquid level is greater than the above water amount, close the water supplement valve; In this way, the dyeing process is always operated in the optimal water level state.

2. The optimal operating level determination and control method of overflow dyeing machine according to claim 1, characterized in that: The mathematical model of the liquid level and the dyeing liquid amount in the dyeing tank is established, Suppose that a layer of Teflon tube with a radius of r2 is laid at the bottom of the dyeing tank, and the actual water amount should be removed from the volume V1 of the Teflon tube, and then there is: （8） In the above formula, C is the length of the submerged part of the Teflon tube, unit: m; r1 is the radius of the Teflon tube arc, unit: m; h is the height of the dyeing solution in the dyeing tank, in meters; r is the inner diameter of the cross section of the dyeing tank, in meters; Then the cross-sectional area of the Teflon tube is: （9） In the above equation, S4 is the cross-sectional area of the four-fluorinated tube, in units of m2 2 ; r2 is the radius of the Teflon tube, unit: m; The radius of the Teflon tube arc is: （10） Suppose that there are n Teflon tubes with a radius of r2 laid at the bottom of the dyeing tank, and then there is: （11） In the above formula, L is the length of the dyeing tank, unit: m; The volume of the Teflon tube at the bottom of the dyeing tank is: （12） In the above formula, n is the number of the laid Teflon tubes; V1 is the volume of the four-fluoro tubing immersed in the dye bath at the bottom of the dye bath, in m 3 ; When the liquid level of the dyeing tank is h, the actual water amount is: （13） In the above formula, V2 is the actual volume of the dyeing solution in the dyeing tank, in m 3 ; From this, the relationship between the indication value of the liquid level meter and the liquid level of the dyeing tank can be obtained.

3. The optimal operating level determination and control method of overflow dyeing machine according to claim 2, characterized in that: The maximum liquid level is measured by the level gauge hy max The minimum liquid level is measured by the level gauge "0" corresponding to the indication value 0% of the level gauge. The actual liquid level height is hy when the level gauge indicates p. （14） The liquid level of the dyeing tank is measured by using the dyeing tank liquid level meter, when installing, the "zero" scale of the dyeing tank liquid level meter is flush with the bottom of the dyeing tank, so the actual liquid level of the dyeing tank is different from the measured liquid level of the dyeing tank liquid level meter by the wall thickness of the dyeing tank; According to formula (14), there is: （15） In the above formula, hy is the liquid level measured by the liquid level meter, unit: m; The wall thickness of the dyeing tank material is in meters.

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