Differential pressure type dosing method and dyeing machine using same

Abstract

The invention discloses a differential pressure type dosing method, which is realized by a dyeing machine, the dyeing machine comprises a dye vat, two ends of the dye vat are communicated with a conveying main pipe provided with a main pump, and the dye vat is additionally provided with a dye vat pressure gauge capable of detecting first pressure in the dye vat and a pH value detector; the dosing device comprises a dosing cylinder, a dosing branch pipe provided with a dosing valve is connected between the dosing cylinder and the conveying main pipe, the dosing cylinder is connected with a medicament source provided with a switch valve, the dosing cylinder is further connected with one end of an air compression branch pipe, the other end of the air compression branch pipe is connected with an air compression source, and the air compression source is connected with the dosing cylinder. The dosing cylinder pressure gauge can detect a second pressure in the dosing cylinder; the differential pressure type dosing method comprises the following steps: a medicament metering step; a liquid taking, mixing and diluting step of introducing a liquid into the dosing cylinder to mix the liquid with at least one medicament; and a backflow dosing step of sending a mixed liquid of the at least one medicament and the liquid in the dosing cylinder back to the conveying main pipe due to pressure difference.

Description

Technical Field

[0001] The present invention relates to a pressure differential dosing method, and in particular to a pressure differential dosing method in which a dosing device uses a pressure differential principle to deliver at least one agent into a dyeing vat under high temperature and high pressure conditions. In addition, the present invention also relates to a dyeing machine using the pressure differential dosing method. Background Art

[0002] During dyeing and finishing operations, the way the dye liquor is added has a significant impact on the dyeing effect of the dyeing machine. Therefore, dyeing machines are generally equipped with a dosing device to replenish the dye or other additives into the dyeing machine at any time, so that the dye liquor can be kept within an appropriate control range, thereby improving the above-mentioned disadvantage of the dye liquor adding method affecting the dyeing effect.

[0003] like Figure 1 , which shows a schematic diagram of a commonly used dyeing machine, the dyeing machine includes a closed high-pressure dyeing tank 10 and a dosing device 20, the closed high-pressure dyeing tank 10, and a delivery main pipe 101 connected to the dyeing tank 10 at both ends. A liquid 30, such as dye liquor, is stored in the dyeing tank 10, and a main pump 102 is provided on the pipeline of the delivery main pipe 101, an upstream end of the delivery main pipe 101 is connected to the bottom of the dyeing tank 10, and a downstream end is connected to the top of the dyeing tank 10. When the main pump 102 is started, the liquid 30 is drawn from the bottom of the dyeing tank 10 and delivered to the top of the dyeing tank 10 through the delivery main pipe 101 to complete the circulation operation of the liquid 30.

[0004] The dosing device 20 is used for performing the dosing process, that is, adding at least one acidic agent or at least one alkaline agent. The dosing device 20 includes a dosing barrel 201 (with a capacity of about 50 liters to 500 liters), the bottom of the dosing barrel 201 is connected to the delivery main pipe 101 with a dosing branch pipe 202, a dosing pump 203 and a dosing valve 204 are arranged on the dosing branch pipe 202, and the delivery main pipe 101 is further connected to a liquid injection branch pipe 103, and a liquid injection valve 104 is arranged on the liquid injection branch pipe 103.

[0005] If the pH value of the liquid 30 in the dye vat 10 is to be adjusted, at least one acidic or alkaline agent 40 is added. First, the operator opens the injection valve 104 so that part of the liquid 30 flowing in the delivery main pipe 101 flows out into the dosing barrel 201. Subsequently, the agent 40 to be added is manually calculated and measured, and then poured into the dosing barrel 201, so that the agent 40 and the liquid 30 are stirred and mixed. Finally, the dosing valve 204 is opened, and the dosing pump 203 is operated to transport the mixed liquid in the dosing barrel 201 through the dosing branch pipe 202 to the delivery main pipe 101 and return to the dye vat 10, thereby completing the manual dosing operation.

[0006] The defects of the above-mentioned common dyeing machine dosing method are that the space required for the equipment is large and the cost is high. In addition, the diameter of the dosing branch pipe 202 is too large, which is not capable of slow and stable dosing according to the pH (acid-base) target value required by the program, which easily causes dyeing, uneven dyeing, waste of cloth and time. Furthermore, the horsepower of the dosing pump 203 is much smaller than that of the main pump 102, so that it is difficult to add medicine under high temperature and high pressure, or even impossible to dosing; in particular, the dosing operation is extremely dangerous under high pressure. Therefore, the liquid 30 in the dye vat 10 must be cooled and depressurized before the dosing operation can be carried out to reduce the danger. Further, the dosing barrel 201 is a barrel with an open top. It is not conducive to the addition of volatile agents, such as glacial acetic acid. Therefore, the many defects of the above-mentioned common dyeing machines are often criticized by technicians and urgently need to be improved. Summary of the invention

[0007] The main purpose of the present invention is to provide a pressure differential dosing method, which is implemented by a dyeing machine. The dyeing machine includes a dosing device and a dyeing tank, and uses a pressure difference method to make at least one agent inside the dosing device and a liquid inside the dyeing tank, such as dye liquid, act to achieve the needs of agent metering, liquid mixing and dilution, and reflux dosing, so that the at least one agent is adjusted to the pH (acid-base) target value required by the program in this way; and compared with the aforementioned manual dosing method, this method has the advantages of being able to slowly, stably and accurately dosing, ensuring uniform dyeing and quality, and having a simple structure, small size, modularity and low cost.

[0008] To achieve the above-mentioned purpose, the technical means adopted by the present invention is to provide a differential pressure dosing method, which is implemented by a dyeing machine, the dyeing machine includes a dyeing tank, a liquid is stored in the dyeing tank, and a delivery main pipe with a main pump is connected at both ends, and the dyeing tank is also provided with a dyeing tank pressure gauge capable of detecting a first pressure inside the dyeing tank and a pH value detector for measuring the pH (acid-base) value of the liquid in the dyeing tank; and a dosing device, which includes a dosing tank, a dosing branch pipe with a dosing valve is connected between the dosing tank and the delivery main pipe, and the dosing tank is connected to a drug source with a switch valve so as to send at least one drug into or stop supplying to the dosing tank; the dosing tank is also connected to one end of an air pressure branch pipe, and the other end of the air pressure branch pipe is connected to an air pressure source, wherein the air pressure branch pipe is respectively provided with an air pressure valve, a pressure relief valve, and a dosing tank pressure gauge capable of detecting a second pressure inside the dosing tank; the method includes:

[0009] a medicine metering step, after measuring at least one medicine of the medicine source, opening the switch valve to allow the at least one medicine to enter the medicine adding tank;

[0010] a liquid mixing and diluting step, wherein the pressure relief valve is opened to reduce the second pressure in the dosing tank until the second pressure in the dosing tank is less than the first pressure in the dye vat 1, and then the pressure relief valve is closed and the dosing valve is opened to allow part of the liquid in the delivery main pipe to enter the dosing tank to mix and dilute the at least one agent; and

[0011] A reflux dosing step, starting the air pressure source to pressurize the dosing tank, making the second pressure in the dosing tank greater than the first pressure in the dye tank, opening the dosing valve, so that the mixed liquid of the at least one agent in the dosing tank and the liquid is sent back to the delivery main pipe due to the pressure difference, and then circulates into the dye tank 1; by adjusting the size of the pressure difference, the reflux rate of the mixed liquid is changed to achieve the required pH target value of the liquid. In one embodiment, the agent source includes at least one first agent branch pipe, one end of each first agent branch pipe is connected to the dosing tank, and the other end is connected to a drug storage barrel for storing one agent, and a first agent valve of the switch valve is provided on each first agent branch pipe.

[0012] In one embodiment, the drug source includes a second drug branch pipe, one end of which is connected to the drug adding cylinder and the other end is connected to a feeding funnel, and a second drug valve of the switch valve is provided on the second drug branch pipe.

[0013] In one embodiment, the feeding funnel is used to feed a small amount of at least one liquid medicine, at least one solid medicine in powder or granular form after manual measurement.

[0014] In one embodiment, the dosing device further comprises a liquid injection branch pipe connected to the feeding funnel, and the liquid injection branch pipe is provided with a liquid injection valve and connected with a cleaning liquid so as to clean the interior of the dosing tank.

[0015] In one embodiment, the dosing device further comprises a liquid injection branch pipe connected to the top of the medicine cylinder, and the liquid injection branch pipe is provided with a liquid injection valve and connected to a cleaning liquid so as to clean the interior of the dosing cylinder.

[0016] In one embodiment, in the medicine metering step, the medicine source uses the length of time the switch valve is open under a stable pressure to measure the liquid medicine of the at least one medicine; or uses a liquid level probe to measure the liquid medicine of the at least one medicine in the dosing tank to achieve automatic metering of the at least one medicine.

[0017] Another object of the present invention is to provide a dyeing machine, which includes a dosing device and a dye vat for implementing a pressure differential dosing method, so that at least one agent inside the dosing device and a liquid inside the dye vat, such as dye liquid, are dosed to achieve the needs of agent metering, liquid mixing and dilution, and reflux dosing, so that the liquid agent can be automatically dosed and controlled by this method, and the reflux dosing rate can be changed by adjusting the size of the pressure difference, and the reflux dosing rate can be slowly and steadily added to achieve the pH (acid-base) target value required by the dyeing process operation; and compared with the aforementioned manual dosing method, this method has the advantages of being able to dosing slowly, stably and accurately, ensuring uniform dyeing and quality, and having a simple structure, small size, modularity and low cost.

[0018] To achieve the above-mentioned purpose, the technical means adopted by the present invention is to provide a dyeing machine, which includes a dyeing tank, in which a liquid is stored, and is connected to a delivery main pipe with a main pump at both ends, and the dyeing tank is also provided with a dyeing tank pressure gauge capable of detecting a first pressure inside the dyeing tank and a pH value detector for measuring the pH (acid-base) value of the liquid in the dyeing tank; and a dosing device, which includes a dosing tank, a dosing branch pipe with a dosing valve is connected between the dosing tank and the delivery main pipe, and the dosing tank is connected to a drug source with a switch valve so as to flow at least one drug into the dosing tank; the dosing tank is also connected to one end of an air pressure branch pipe, and the other end of the air pressure branch pipe is connected to an air pressure source, wherein the air pressure branch pipe is respectively provided with an air pressure valve, a pressure relief valve, and a dosing tank pressure gauge capable of detecting a second pressure inside the dosing tank, so that the dyeing machine is used to implement a differential pressure dosing method, which method includes:

[0019] a medicine metering step, after measuring at least one medicine of the medicine source, opening the switch valve to allow the at least one medicine to enter the medicine adding tank;

[0020] a liquid mixing and diluting step, wherein the pressure relief valve is opened to reduce the second pressure in the dosing tank until the second pressure in the dosing tank is less than the first pressure in the dye vat 1, and then the pressure relief valve is closed and the dosing valve is opened to allow part of the liquid in the delivery main pipe to enter the dosing tank to mix and dilute the at least one agent; and

[0021] A reflux dosing step is to start the air pressure source to pressurize the dosing tank so that the second pressure in the dosing tank is greater than the first pressure in the dyeing tank, and then open the dosing valve to allow the mixed liquid of the at least one agent in the dosing tank and the liquid to be sent back to the delivery main pipe due to the pressure difference and then circulate into the dyeing tank; by adjusting the size of the pressure difference, the reflux rate of the mixed liquid is changed to achieve the required pH target value of the liquid.

[0022] In one embodiment, the drug source includes at least one first drug branch pipe, one end of each first drug branch pipe is connected to the drug adding cylinder, and the other end is connected to a drug storage barrel storing a drug, and a first drug valve of the switch valve is provided on each first drug branch pipe.

[0023] In one embodiment, the drug source includes a second drug branch pipe, one end of which is connected to the drug adding cylinder and the other end is connected to a feeding funnel, and a second drug valve of the switch valve is provided on the second drug branch pipe.

[0024] In one embodiment, the feeding funnel is used to feed a small amount of at least one liquid medicine, at least one solid medicine in powder or granular form after manual measurement.

[0025] In one embodiment, the dosing device further includes a liquid injection branch pipe connected to the feeding funnel, and the liquid injection branch pipe is provided with a liquid injection valve and connected to a cleaning liquid so as to clean the interior of the dosing tank.

[0026] In one embodiment, the dosing device further includes a liquid injection branch pipe connected to the top of the medicine cylinder, and the liquid injection branch pipe is provided with a liquid injection valve and connected to a cleaning liquid to clean the interior of the dosing cylinder.

[0027] In one embodiment, in the medicine metering step, the medicine source uses the length of time the switch valve is open under a stable pressure to measure the liquid medicine of the at least one medicine; or uses a liquid level probe to measure the liquid medicine of the at least one medicine in the dosing tank to achieve automatic metering of the at least one medicine. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic diagram of manual dosing in a commonly used dyeing machine;

[0029] Figure 2 This is a schematic diagram of automatic dosing of the dyeing machine of the present invention;

[0030] Figure 3 The present invention is based on Figure 2 A schematic diagram of a specific embodiment of a dyeing machine. DETAILED DESCRIPTION

[0031] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0032] like Figure 2 and Figure 3As shown, the present invention discloses a differential pressure dosing method, which is implemented by a dyeing machine, and the dyeing machine includes a dyeing tank 1 and a dosing device 2. The dyeing tank 1 is a closed cylinder body, and includes a delivery trunk 11 connected at both ends. A liquid 3, such as high-temperature dye liquid, is stored in the dyeing tank 1, and a main pump 111 is connected to the pipeline of the delivery trunk 11, an upstream end of the delivery trunk 11 is connected to a bottom of the dyeing tank 1, and a downstream end is connected to a top of the dyeing tank 1. Therefore, when the main pump 111 is started, the liquid 3 is drawn out from the bottom of the dyeing tank 1, and is transported and discharged to the top of the dyeing tank 1 through the delivery trunk 11, so as to complete the circulation operation of the liquid 3 in the dyeing tank 1 and the delivery trunk 11. Furthermore, the dye vat 1 is further provided with a dye vat pressure gauge 12 for detecting a first pressure P1 in the dye vat 1 , and a pH (acid-base) value detector 13 for measuring the pH value of the liquid 3 in the dye vat 1 .

[0033] The dosing device 2 includes a dosing cylinder 21, which is a closed cylinder body, and a dosing branch pipe 22 is connected between the bottom of the dosing cylinder and the main pipe 11, and a dosing valve 221 is arranged on the pipe of the dosing branch pipe 22. The dosing cylinder 21 is connected to a medicine source 23 provided with a switch valve, so as to feed or stop the supply of at least one medicine 4 into the dosing cylinder 21. Figure 2 and Figure 3 As shown, a first embodiment of the drug source 23 includes at least one first drug branch pipe 231, one end of each of the first drug branch pipes 231 is connected to the drug adding cylinder 21, and the other end is connected to a drug storage barrel (not shown) storing the drug 4, such as liquid drug 4, and a first drug valve 232 of the switch valve is provided on each of the first drug branch pipes 231.

[0034] In addition, the dosing cylinder 21 is also connected to one end of an air pressure branch pipe 24, and the other end of the air pressure branch pipe 24 is connected to an air pressure source 25, such as an air compressor, wherein the air pressure branch pipe 24 is respectively provided with an air pressure valve 241, a pressure relief valve 242, and a dosing cylinder pressure gauge 26, wherein the dosing cylinder pressure gauge 26 is used to detect a second pressure P2 in the dosing cylinder 21. Furthermore, the dosing cylinder 21 is also connected to a liquid level probe 28, so as to measure the at least one liquid agent 4 entering the dosing cylinder 21.

[0035] When the liquid medicine 4 is to be automatically added, the pressure differential adding method includes:

[0036] A medicine metering step is to open the switch valve of the medicine source 23, for example, the selected at least one first medicine valve 232, so that the at least one liquid medicine 4 enters the medicine-adding cylinder 21 through each of the first medicine branches 231 and mixes with the liquid 3, and then close the at least one first medicine valve 232; under stable pressure, the length of time the at least one first medicine valve 232 is opened is used to measure the at least one liquid medicine 4; or the liquid level probe 28 is used to measure the at least one liquid medicine 4 in the medicine-adding cylinder 21.

[0037] A liquid mixing and dilution step is performed, in which the pressure relief valve 242 is opened to reduce the second pressure P2 in the dosing tank 21 until the second pressure P2 in the dosing tank 21 is less than the first pressure P1 in the dye vat 1. The pressure relief valve 242 is then closed and the dosing valve 221 is opened to allow part of the liquid 3 in the delivery main pipe 11 to enter the dosing tank 21 to mix and dilute the at least one agent 4.

[0038] A reflux dosing step is to start the air pressure source 25 to pressurize the dosing tank 21, so that the second pressure P2 in the dosing tank 21 is greater than the first pressure P1 in the dyeing tank, and then the dosing valve 221 is opened to allow the mixed liquid of the at least one agent 4 and the liquid 3 in the dosing tank 21 to be sent back to the delivery main pipe 11 due to the pressure difference, and then circulate into the dyeing tank 1; by adjusting the size of the pressure difference, the reflux rate of the mixed liquid is changed, for example, slowly and steadily adding to achieve the pH target value required by the liquid 3 in the dyeing and finishing operation, so as to complete the automatic dosing step.

[0039] In addition, a second embodiment of the drug source 23 includes a second drug branch pipe 233, one end of the second drug branch pipe 233 is connected to the drug adding tank 21, and the other end is connected to a feeding funnel 235, and a second drug valve 234 of the switch valve is provided on the second drug branch pipe 233. The feeding funnel 235 is used to manually input drugs 4, such as a small amount of at least one liquid drug 4, at least one solid drug 4 in powder or granular form.

[0040] When the manual dosing operation of the small amount of at least one liquid medicine 4 or the at least one solid medicine 4 is to be performed, the pressure differential dosing method further comprises:

[0041] A medicine metering step is to manually put a small amount of the at least one liquid medicine 4 or the at least one solid medicine 4 into the feeding funnel 235 after manual metering, and open the second medicine valve 234 to allow the medicine 4 to enter the dosing tank 21 along the second medicine branch pipe 233.

[0042] A liquid mixing and dilution step is performed, in which the pressure relief valve 242 is opened to reduce the second pressure P2 in the dosing tank 21 to 0, until the second pressure P2 in the dosing tank 21 is less than the first pressure P1 in the dye vat 1, the pressure relief valve 242 is closed, and the dosing valve 221 is opened to allow part of the liquid 3 in the delivery main pipe 11 to enter the dosing tank 21 to mix and dilute the at least one agent 4.

[0043] A reflux dosing step is to start the air pressure source 25 to pressurize the dosing tank 21, so that the second pressure P2 in the dosing tank 21 is greater than the first pressure P1 in the dyeing tank, and then the dosing valve 221 is opened to allow the mixed liquid of the at least one agent 4 and the liquid 3 in the dosing tank 21 to be sent back to the delivery main pipe 11 due to the pressure difference, and then circulate into the dyeing tank 1; by adjusting the size of the pressure difference, the reflux rate of the mixed liquid is changed, for example, slowly and steadily adding to achieve the pH target value required by the liquid 3 in the dyeing and finishing operation, so as to complete the manual dosing step.

[0044] The first embodiment and the second embodiment of the drug source 23 can be implemented individually or in combination according to actual usage conditions to expand the scope of application.

[0045] Furthermore, the dosing device 2 also includes a liquid injection branch pipe 27 connected to the feeding funnel 235 , and a liquid injection valve 271 is provided on the pipeline of the liquid injection branch pipe 27 and connected to a cleaning liquid W so as to clean the interior of the dosing cylinder 21 .

[0046] The cleaning step includes: opening the pressure relief valve 242 to reduce the second pressure P2 in the dosing cylinder 21 to 0, closing the pressure relief valve 242, and then opening the injection valve 271 to allow the cleaning liquid W to pass through the injection branch pipe 27, the second agent branch pipe 233 and the injection valve 271 due to the pressure difference and enter the dosing cylinder 21 for cleaning, and then closing the injection valve 271; finally, starting the air pressure source 25 to pressurize the dosing cylinder 21 so that the second pressure P2 in the dosing cylinder 21 is greater than the first pressure P1 in the dyeing cylinder 1, and then opening the dosing valve 221 to allow the cleaning liquid W in the dosing cylinder 21 to be sent back to the delivery main pipe 11 due to the pressure difference and circulate into the dyeing cylinder 1 to complete the cleaning step.

[0047] Furthermore, the injection branch pipe 27 used in the cleaning step is not limited to being connected to the feeding funnel 235. If the medicine source 23 adopts the first embodiment, the injection branch pipe 27 is connected to the top of the medicine tank 21, which also has the cleaning effect.

[0048] In actual use, the pressure relief valve 242 and the dosing valve 221 can be opened and closed by an automatic control unit after comparing the second pressure P2 in the dosing tank 21 with the first pressure P1 in the dye tank 1. Similarly, other switch valves (such as the first drug valve 232, the second drug valve 234), the air pressure valve 241 and the injection valve 271 can also be opened and closed by the automatic control unit to achieve the function of automatic control. Of course, the above valve bodies can also be opened and closed by manual operation.

[0049] Therefore, through the implementation of the present invention, its beneficial effect is that the dosing device and the dyeing vat use the pressure difference method to make the at least one agent inside the dosing device and the liquid inside the dyeing vat, such as dye liquid, move to achieve the requirements of agent metering, liquid mixing and dilution, and reflux dosing, so that the at least one agent is subjected to the pH (acid-base) target value required by the procedure through this method, and compared with the aforementioned manual dosing method, this method has the advantages of being able to slowly, stably and accurately dosing, ensuring uniform dyeing and quality, and having a simple structure, small size, modularization and low cost. In addition, after the dosing is completed and the inside of the agent vat is cleaned, there is no need to add the dosing pump to return the mixed liquid or the cleaning liquid to the delivery main pipe, and it can be achieved by using the internal pressure difference method, thereby reducing the construction and maintenance costs, and increasing the safety during operation. In particular, the dosing vat is closed, which is conducive to the addition of volatile agents, such as glacial acetic acid, and is a preferred structure unprecedented in similar items.

[0050] The specific embodiments described above have described in detail the objectives, technical solutions and beneficial effects of the present invention. It should be understood that the above are only specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A pressure differential dosing method, characterized in that: The method is implemented by a dyeing machine, which includes a dyeing vat, in which a liquid is stored, and a delivery main pipe with a main pump is connected at both ends, and the dyeing vat is further provided with a dyeing vat pressure gauge capable of detecting a first pressure inside the dyeing vat and a pH value detector for measuring the pH value of the liquid in the dyeing vat; and a dosing device, which includes a dosing vat, a dosing branch pipe with a dosing valve is connected between the dosing vat and the delivery main pipe, and the dosing vat is connected to a drug source with a switch valve so as to feed or stop at least one drug into the dosing vat; the dosing vat is further connected to one end of an air pressure branch pipe, and the other end of the air pressure branch pipe is connected to an air pressure source, wherein the air pressure branch pipe is respectively provided with an air pressure valve, a pressure relief valve, and a dosing vat pressure gauge capable of detecting a second pressure inside the dosing vat; the method includes: A medicine metering step: after measuring at least one medicine of the medicine source, the switch valve is opened to allow the at least one medicine to enter the medicine adding tank; a liquid mixing and diluting step, wherein the pressure relief valve is opened to reduce the second pressure in the dosing tank until the second pressure in the dosing tank is less than the first pressure in the dye vat (1), and then the pressure relief valve is closed and the dosing valve is opened to allow part of the liquid in the delivery main pipe to enter the dosing tank to mix and dilute the at least one agent; and A reflux dosing step is to start the air pressure source to pressurize the dosing tank so that the second pressure in the dosing tank is greater than the first pressure in the dyeing tank, and then open the dosing valve to allow the mixed liquid of the at least one agent and the liquid in the dosing tank to be sent back to the delivery main pipe due to the pressure difference and then circulate into the dyeing tank (1); by adjusting the size of the pressure difference, the reflux rate of the mixed liquid is changed to achieve the required pH target value of the liquid.

2. The differential pressure dosing method according to claim 1, characterized in that: The medicine source includes at least one first medicine branch pipe, one end of each first medicine branch pipe is connected to the medicine adding cylinder, and the other end is connected to a medicine storage barrel storing the medicine, and a first medicine valve of the switch valve is arranged on each first medicine branch pipe.

3. The pressure differential dosing method according to claim 1, characterized in that: The medicine source comprises a second medicine branch pipe, one end of which is connected to the medicine adding cylinder, and the other end is connected to a feeding funnel, and a second medicine valve of the switch valve is arranged on the second medicine branch pipe.

4. The differential pressure dosing method according to claim 3, characterized in that: The feeding funnel is used for feeding a small amount of at least one liquid medicine or at least one solid medicine in powder or granular form after manual measurement.

5. The differential pressure dosing method according to claim 3, characterized in that: The dosing device further comprises a liquid injection branch pipe connected to the feeding funnel, and a liquid injection valve is arranged on the pipeline of the liquid injection branch pipe and connected with a cleaning liquid so as to clean the inside of the dosing tank.

6. The differential pressure dosing method according to claim 2, characterized in that: The dosing device further comprises a liquid injection branch pipe connected to the top of the medicine cylinder, and a liquid injection valve is arranged on the pipeline of the liquid injection branch pipe and connected with a cleaning liquid so as to clean the inside of the dosing cylinder.

7. The differential pressure dosing method according to claim 1, characterized in that: In the medicine metering step, the medicine source uses the length of time the switch valve is opened under stable pressure to measure the liquid medicine of the at least one medicine; or uses a liquid level probe to measure the liquid medicine of the at least one medicine in the medicine adding cylinder to achieve automatic metering of the at least one medicine.

8. A dyeing machine, characterized in that: The invention comprises a dyeing vat, in which a liquid is stored, and a delivery main pipe provided with a main pump is connected at both ends, and the dyeing vat is further provided with a dyeing vat pressure gauge capable of detecting a first pressure inside the dyeing vat and a pH value detector for measuring the pH value of the liquid in the dyeing vat; and a dosing device, which comprises a dosing vat, a dosing branch pipe provided with a dosing valve is connected between the dosing vat and the delivery main pipe, and the dosing vat is connected to a drug source provided with a switch valve so as to feed or stop supplying at least one drug into the dosing vat; the dosing vat is further connected to one end of an air pressure branch pipe, and the other end of the air pressure branch pipe is connected to an air pressure source, wherein the air pressure branch pipe is respectively provided with an air pressure valve, a pressure relief valve, and a dosing vat pressure gauge capable of detecting a second pressure inside the dosing vat, so that the dyeing machine is used to implement a differential pressure dosing method, which comprises: A medicine metering step: the medicine source measures the at least one liquid medicine by using the length of time the switch valve is open under a stable pressure; or a liquid level probe is used to measure the at least one liquid medicine in the medicine adding tank; a liquid mixing and diluting step, wherein the pressure relief valve is opened to reduce the second pressure in the dosing tank until the second pressure in the dosing tank is less than the first pressure in the dye vat (1), and then the pressure relief valve is closed and the dosing valve is opened to allow part of the liquid in the delivery main pipe to enter the dosing tank to mix and dilute the at least one agent; and A reflux dosing step is to start the air pressure source to pressurize the dosing tank so that the second pressure in the dosing tank is greater than the first pressure in the dyeing tank, and then open the dosing valve to allow the mixed liquid of the at least one agent and the liquid in the dosing tank to be sent back to the delivery main pipe due to the pressure difference and then circulate into the dyeing tank (1); by adjusting the size of the pressure difference, the reflux rate of the mixed liquid is changed to achieve the required pH target value of the liquid.

9. The dyeing machine according to claim 8, characterized in that The medicine source includes at least one first medicine branch pipe, one end of each first medicine branch pipe is connected to the medicine adding cylinder, and the other end is connected to a medicine storage barrel storing the medicine, and a first medicine valve of the switch valve is arranged on each first medicine branch pipe.

10. The dyeing machine according to claim 8, characterized in that The medicine source comprises a second medicine branch pipe, one end of which is connected to the medicine adding cylinder, and the other end is connected to a feeding funnel, and a second medicine valve of the switch valve is arranged on the second medicine branch pipe.

11. The dyeing machine according to claim 10, characterized in that: The feeding funnel is used for feeding a small amount of at least one liquid medicine or at least one solid medicine in powder or granular form after manual measurement.

12. The dyeing machine according to claim 10, characterized in that: The dosing device further comprises a liquid injection branch pipe connected to the feeding funnel, and a liquid injection valve is arranged on the pipeline of the liquid injection branch pipe and connected with a cleaning liquid so as to clean the inside of the dosing tank.

13. The dyeing machine according to claim 9, characterized in that: The dosing device further comprises a liquid injection branch pipe connected to the top of the medicine cylinder, and a liquid injection valve is arranged on the pipeline of the liquid injection branch pipe and connected with a cleaning liquid so as to clean the inside of the dosing cylinder.

14. The dyeing machine according to claim 8, characterized in that In the medicine metering step, the medicine source uses the length of time the switch valve is opened under stable pressure to measure the liquid medicine of the at least one medicine; or uses a liquid level probe to measure the liquid medicine of the at least one medicine in the medicine adding cylinder to achieve automatic metering of the at least one medicine.

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