A printing and dyeing alkali solution adding device

Abstract

The application relates to the field of liquid adding equipment, in particular to a printing and dyeing alkali liquid adding device which comprises a first container, a second container, a first valve, a second valve and a pressurizing system. Alkali liquid in the first container can flow into the second container in sequence under the action of gravity, and the second container can realize quantitative feeding of the alkali liquid. The second output port is used for communicating with a dye vat to feed the alkali liquid in the second container into the dye vat. The first valve is used for controlling whether the first input port and the first output port are communicated or not. The second valve is used for controlling the on / off of the second output port of the second container. The pressurizing system is used for filling gas flow into the second container to pressurize the second container, push the alkali liquid out of the second output port and add the alkali liquid. In the application, the pump does not need to participate in the addition of the alkali liquid, but the alkali liquid is pushed into the dye vat by the gas pressure to realize liquid adding, so that the problem that the pump is damaged due to the crystallization of the alkali liquid can be avoided.

Description

Technical Field

[0001] This application relates to the field of liquid addition equipment, and more particularly to a dyeing alkali addition device. Background Technology

[0002] In textile printing and dyeing processes, one of the important steps is adding alkali solution to the dyeing vat. Traditionally, this was done by manually pouring the solution into the vat. With technological advancements, a method using metering pumps to add the solution has emerged.

[0003] This method of adding liquid via a metering pump still has shortcomings in practical use. For example, the alkali solution needs to flow through the metering pump. With continuous use, the alkali solution will crystallize inside the metering pump. The presence of these crystals will cause the metering pump to clog and dry run, making the metering pump easy to damage. Therefore, it still needs to be improved. Utility Model Content

[0004] In order to solve at least one of the technical problems mentioned in the background art, the purpose of this application is to provide a dyeing alkali solution adding device.

[0005] To achieve the above objectives, this application provides the following technical solution.

[0006] A dyeing alkali solution adding device, comprising: A first container is used to store alkaline solution; the first container has a first outlet for discharging the internal alkaline solution. The second container has a first inlet and a second outlet, the first outlet and the first inlet being connected, so that the alkali solution in the first container can flow into the second container sequentially through the first outlet and the first inlet under the action of gravity, and the second container can measure the alkali solution quantitatively; the second outlet is used to connect to the dyeing vat to input the alkali solution in the second container into the dyeing vat; The first valve is located between the first input port and the first output port to control whether the first input port and the first output port are connected or not. The second valve is used to control the opening / closing of the second outlet of the second container; A pressurization system is operably connected to a second container. When the pressurization system is turned on, it introduces airflow into the second container to pressurize the contents and push the alkali solution out of the second outlet.

[0007] As an optional embodiment of this application, the first valve is a manually operated opening / closing structure, and at least part of the peripheral wall of the second container forms a transparent area, on which scale lines are provided to indicate the liquid level in the second container.

[0008] As an optional embodiment of this application, the first valve is an electrically operated opening / closing structure controlled by a PLC; the adding device further includes a detection element capable of detecting the amount of alkali solution entering the second container, and the PLC is configured to control the first valve to close when the detection value of the detection element reaches a set value.

[0009] As an optional embodiment of this application, the detection element includes a liquid level sensor disposed in the second container and capable of detecting the liquid level in the second container; or the detection element includes an electronic flow meter disposed between the first output port and the first input port.

[0010] As an optional embodiment of this application, the pressurization system includes a compression tank storing compressed gas and a third valve, the output end of the compression tank being connected to a second container, and the third valve being used to control whether the compression tank and the second container are connected; or the pressurization system includes an air pump, the output end of which is connected to the second container.

[0011] As an optional embodiment of this application, the top of the second container is provided with a pressure relief component, the pressure relief component having an air passage for connecting the second container; the pressure relief component is capable of switching between a first mode and a second mode: In the first mode, the airway remains open so that the second container can communicate with the external environment through the airway; In the second mode, the airway can switch between an open state and a closed state. In the open state, the second container is connected to the external environment through the airway; in the closed state, the airway is closed to cut off the connection between the second container and the external environment through the airway. In the second mode, the airway is configured such that when the air pressure in the second container is greater than or equal to a set air pressure value, the airway enters the open state, and when the air pressure in the second container is less than the set air pressure value, the airway enters the closed state.

[0012] As an optional embodiment of this application, the pressure relief component includes: The first part has a channel extending through it in a first direction; the channel has an annular stepped surface that protrudes radially from the inner peripheral wall of the channel, and the inner ring of the stepped surface forms an air hole. The second part includes a first component disposed within the channel and located above the step surface along a first direction; at least a portion of the outer peripheral wall of the first component and the inner peripheral wall of the channel are separated to serve as a gap allowing airflow; the first component is movable within the channel along the first direction between a first position and a second position; in the first position, the first component presses against the step surface to block the air hole; in the second position, the first component forms a gap between itself and the step surface in the first direction; An elastic element is used to provide an elastic force that causes the first member to tend to move toward a first position; The second part can rotate circumferentially relative to the first part to switch between the first mode and the second mode.

[0013] As an optional embodiment of this application, the second part further includes a protrusion, and the outer peripheral wall of the first part is provided with a guide groove, the guide groove including a first guide groove extending along a first direction and a second guide groove disposed along the circumferential direction of the channel; the first guide groove and the second guide groove are connected, the protrusion is at least partially located in the guide groove, and the protrusion is movable between the first guide groove and the second guide groove; when the protrusion is located in the first guide groove, the pressure relief component enters a first mode, and when the protrusion is located in the second guide groove in the second mode, the pressure relief component enters a second mode.

[0014] As an optional embodiment of this application, the elastic element includes a spring, which provides an elastic force to cause the first member to have a downward tendency along a first direction.

[0015] As an optional embodiment of this application, a seal is provided between the stepped surface and the first component.

[0016] Compared with the prior art, this application has the following advantages: In this application, the addition of alkali solution does not require the participation of a pump. Instead, the alkali solution is pushed into the dyeing vat by air pressure to achieve the addition of the solution. This avoids the problem of pump damage caused by crystallization of alkali solution.

[0017] Furthermore, in this scheme, the air pressure does not directly push the alkali solution in the first container into the dyeing vat, but relies on the second container as an intermediary. In this way, the second container can act as a quantitative container to quantitatively measure the alkali solution to be pushed into the dyeing vat.

[0018] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of this application, nor is it intended to limit the scope of this application. Other features of this application will become readily apparent from the following description. Attached Figure Description

[0019] The above and other objects, features, and advantages of exemplary embodiments of this application will become readily apparent from the following detailed description taken in conjunction with the accompanying drawings. Several embodiments of this application are illustrated in the drawings by way of example and not limitation, wherein: In the accompanying drawings, the same or corresponding reference numerals indicate the same or corresponding parts.

[0020] Figure 1 A schematic diagram of the structure of this application is shown; Figure 2A schematic diagram of the pressure relief component of this application is shown; Figure 3 An exploded view of the pressure relief component of this application is shown; Figure 4 This diagram shows the structure of the pressure relief component of this application in the second mode with the airway closed; Figure 5 A schematic diagram of the pressure relief component of this application in a first mode is shown.

[0021] Explanation of the labels in the diagram: 1. First container; 11. First outlet; 12. First pipeline; 2. Second container; 21. First inlet; 22. Second outlet; 23. Second pipeline; 231. Second valve; 3. Compression tank; 31. Third pipeline; 311. Third valve; 4. Pressure relief component; 41. First part; 411. Channel; 412. Stepped surface; 413. Air hole; 414. First guide groove; 415. Second guide groove; 416. Connecting block; 5. Second part; 51. First component; 52. Shaft; 53. Protrusion; 54. Handle; 6. Spring; 7. Sealing ring. Detailed Implementation

[0022] To make the objectives, features, and advantages of this application more apparent and understandable, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0023] In order to prevent the problem of damage to the metering pump caused by crystallization of alkali solution in the traditional method of adding alkali solution, this application provides a dyeing alkali solution adding device that does not require the participation of a pump (hereinafter referred to as this device or this application).

[0024] This device mainly relies on air pressure to add liquid, thus avoiding the need for a metering pump.

[0025] This device mainly includes: A first container is used to store alkaline solution; the first container has a first outlet for discharging the internal alkaline solution. The second container has a first inlet and a second outlet, the first outlet and the first inlet being connected, so that the alkali solution in the first container can flow into the second container sequentially through the first outlet and the first inlet under the action of gravity, and the second container can measure the alkali solution quantitatively; the second outlet is used to connect to the dyeing vat to input the alkali solution in the second container into the dyeing vat; The first valve is located between the first input port and the first output port to control whether the first input port and the first output port are connected or not. The second valve is used to control the opening / closing of the second outlet of the second container; A pressurization system is operably connected to a second container. When the pressurization system is turned on, it introduces airflow into the second container to pressurize the contents and push the alkali solution out of the second outlet.

[0026] Example 1 Figure 1 The main structure of the device is shown. The first container 1 is mainly used as a container for storing alkaline solution. The alkaline solution can be prepared in other containers and then transferred into the first container 1, or it can be prepared directly in the first container 1. No limitation is made here.

[0027] In order to discharge the alkaline solution in the first container 1, a first outlet 11 is provided at the bottom or near the bottom of the first container 1, and the alkaline solution in the first container 1 can flow out from the first outlet 11 under the action of gravity.

[0028] The second container 2 is essentially a transfer container, mainly used to receive the alkaline solution output from the first container 1 in a quantitative manner, and then output the alkaline solution in the second container 2 into the dyeing vat after quantitative measurement.

[0029] The second container 2 has a first inlet 21 located at its top or upper side. The first inlet 21 is connected to the first outlet 11 of the first container 1 via a first pipe 12. In some embodiments, the height of the first inlet 21 does not exceed the height of the first outlet 11 in the direction of gravity. This allows the alkaline solution in the first container 1 to flow into the second container 2 sequentially through the first outlet 11 and the first inlet 21 under the influence of gravity.

[0030] In addition, in order to control the flow of alkaline solution from the first container 1 into the second container 2 by controlling the opening and closing of the first pipeline 12, a first valve is provided on the first pipeline 12.

[0031] In other words, in this application, the second container 2 can achieve quantitative control of the alkaline solution. The specific design for enabling quantitative control of the second container 2 can be one of the following two methods: Method 1: Design the first valve as a manually operated valve structure, such as a traditional mechanical valve; the operator can manually operate the first valve (e.g., rotate the valve handle) to open and close the first valve.

[0032] In addition, at least part of the peripheral wall of the second container 2 forms a transparent area. In some embodiments, the second container 2 as a whole can be made of transparent material, so that the human eye can observe the liquid level in the second container 2 through the transparent area. Accordingly, in order to indicate the current liquid level, a scale line is provided on the transparent area to indicate the liquid level in the second container 2, and each scale line corresponds to a specific amount of alkali solution. The specific operation for achieving quantitative control of the second container 2 using this method can be as follows: first, determine the amount of alkali solution to be added (referred to as the set amount), and then find the scale line corresponding to the set amount.

[0033] Then, the first valve is opened, and the alkaline solution in the first container 1 flows into the second container 2 through the first pipe 12 under its own weight. When the liquid level in the second container 2 reaches the scale line corresponding to the set amount, the first valve is closed. In this way, the set amount of alkaline solution is collected in the second container 2.

[0034] Method 2 can be carried out automatically and quantitatively, that is, the first valve is designed to be electrically opened / closed, such as a solenoid valve; the first valve is controlled by a PLC (i.e., controller), and the action of the first valve is controlled by the PLC.

[0035] The adding device also includes a detection element capable of detecting the amount of alkali solution entering the second container 2. In some embodiments, the detection element may be a level sensor installed in the second container 2 and capable of detecting the liquid level in the second container 2, or the detection element may be an electronic flow meter installed on the first pipeline 12, which can detect the amount of alkali solution flowing through the first flow meter in real time.

[0036] The PLC is configured to close the first valve when the detection value of the detector reaches a set value (which can be understood as the aforementioned set amount), thus ensuring that the second container 2 collects a quantitative amount of alkaline solution. Compared with the first method, this method has the advantage that the closing action of the first valve does not require manual operation; it can automatically close after the liquid volume is sufficient.

[0037] In other words, the above method can ensure that a certain amount of alkaline solution is collected in the second container 2.

[0038] Next, a measured amount of alkali solution in the second container 2 is pushed into the dyeing vat. Therefore, a second outlet 22 is provided at the bottom of the second container 2 to discharge the alkali solution. The second outlet 22 is connected to the dyeing vat via a second pipe 23. To control the opening and closing of the second pipe 23, a second valve is provided on the second pipe 23. When the second container 2 collects the alkali solution released from the first container 1, the second valve is closed; when it is necessary to discharge the alkali solution in the second container 2 into the dyeing vat, the second valve is opened.

[0039] In this device, the pressurization system is mainly used to add the alkali solution in the second container 2 into the dyeing vat by means of air pressure. In other words, the pressurization system is equivalent to a power unit, which uses air pressure as the power to push the alkali solution into the dyeing vat.

[0040] This embodiment provides a specific pressurization system, which mainly includes a compression tank 3 and a third valve 311. The compression tank 3 stores compressed clean gas, such as nitrogen. The compression tank 3 is connected to the top of the second container 2 through a third pipeline 31. The third valve 311 is provided on the third pipeline 31 to control the opening and closing of the third pipeline 31. When it is necessary to add the alkali solution in the second container 2 to the dyeing vat, the third valve 311 is opened, so that the compressed gas in the compression tank 3 flows into the second container 2 through the third pipeline 31, thereby increasing the gas pressure in the second container 2. Under the action of this gas pressure, the alkali solution in the second container 2 can be pushed into the dyeing vat through the second pipeline 23 to achieve liquid addition.

[0041] Of course, in addition to the pressurization system using the compression tank 3 mentioned above, the pressurization system can also include an air pump that directly outputs high-pressure airflow, wherein the output end of the air pump is connected to the second container 2. In this method, although a pump is also used, in this application, the air pump mainly provides a high-pressure air source, and the alkali solution does not flow through the air pump, thus avoiding the problem of air pump damage due to alkali solution crystallization.

[0042] like Figure 1 As shown, the second container 2 is equipped with a pressure relief component 4 at the top, which is mainly used to control the air pressure inside the second container 2. It can be understood that when the pressure is increased in the second container 2 by the pressurization system, if the air pressure inside the second container 2 is too high, the second container 2 may be crushed. Therefore, the pressure relief component 4 is designed. In addition, during the process of adding liquid from the first container 1 to the second container 2, as the liquid level in the second container 2 rises, the air pressure inside the second container 2 will also gradually increase. Under the action of this increased air pressure, it will affect the subsequent liquid intake in the second container 2. At this time, the pressure relief component 4 can play the role of balancing the air pressure inside the second container 2.

[0043] In short, the pressure relief component 4 in this application has two functions: first, when liquid is added from the second container 2 to the first container 1, it balances the air pressure in the second container 2 so that the alkaline solution in the first container 1 can flow normally into the second container 2; second, when the pressurization system pressurizes the second container 2 to push the alkaline solution, it prevents the air pressure in the second container 2 from becoming too high.

[0044] like Figures 2-5 The diagram shows a structural schematic of a pressure relief component 4, which mainly includes a first part 41 and a second part 5.

[0045] like Figure 2 As shown, the first part 41 is cylindrical or hollow, so that the first part 41 has a channel 411 that runs through the first part 41 along a first direction. The first direction can be understood as the height direction, that is, the up and down direction.

[0046] The first part 41 is fixed in the second container 2, for example, by a flange connection; the two ends of the channel 411 are open, with the upper end connected to the external environment as the air outlet and the lower end connected to the second container 2 as the air inlet. For example, a hole is opened on the top wall of the second container 2 at the position corresponding to the air inlet, and the second container 2 is connected to the channel 411 through the hole.

[0047] like Figure 2 As shown, a guide groove is provided on the outer peripheral wall of the first part 41, and the guide groove radially penetrates the peripheral wall of the first part 41; the guide groove includes a first guide groove 414 extending along a first direction and a second guide groove 415 arranged circumferentially along the channel 411; the first guide groove 414 and the second guide groove 415 are connected, and at this time the first guide groove 414 and the second guide groove 415 are perpendicular to each other, forming an L-shaped guide groove structure. The specific function of the guide groove will be explained later.

[0048] like Figure 4 As shown, the internal structure of the first part 41 is illustrated. The channel 411 has an annular stepped surface 412 that protrudes radially from the inner peripheral wall of the channel 411. The inner ring of the stepped surface 412 forms an air hole 413. Specifically, the stepped surface 412 can be formed by the inner peripheral wall of the channel 411 protruding radially inward to form an annular step. The top surface of the step constitutes the stepped surface 412, and the center of the step forms the air hole 413. The channel 411 is equivalent to being divided into two parts, upper and lower, by the step. The upper and lower parts of the channel 411 are connected by the air hole 413. At this time, the upper and lower parts of the channel 411 and the air hole 413 together constitute an air passage, connecting the inside and outside of the second container 2.

[0049] like Figure 3As shown, the second part 5 is mainly used to move within the channel 411 to realize the opening / closing of the air hole 413; the second part 5 mainly includes a first component 51, a shaft 52, a handle 54 and a protrusion 53.

[0050] The first component 51 is basically cylindrical in shape. It is located in the channel 411 and can move axially (i.e., move in the first direction) within the channel 411.

[0051] like Figure 4 As shown, the diameter of the first component 51 is smaller than the diameter of the channel 411, such that at least a portion of the gap between the outer peripheral wall of the first component 51 and the inner peripheral wall of the channel 411 is provided as a gap to allow airflow. In this embodiment, the gap is approximately annular in shape and surrounds the periphery of the first component 51.

[0052] Furthermore, the first component 51 is located on the upper side of the step surface 412, and the first component 51 is capable of moving between a first position and a second position within the channel 411 along a first direction.

[0053] In the first position, the first component 51 presses against the step surface 412 to block the air hole 413. At this time, it is equivalent to the entire pressure relief component 4 being in a closed state, or in other words, the air passage formed by the channel 411 and the air hole 413 being in a closed state.

[0054] To improve the sealing performance in the closed state, a sealing element, such as a sealing ring 7, is provided between the step surface 412 and the first component 51. It is fixed on the step surface 412 and is substantially coaxial with the vent 413.

[0055] In the second position, the first component 51 forms a gap between itself and the step surface 412 in the first direction. At this time, the vent 413 can communicate with the aforementioned gap through this gap, allowing the airflow output from the vent 413 to flow out through this gap. That is, in the second position, the pressure relief component 4 is in the open state, or in other words, the air passage is in the open state.

[0056] An elastic element is used to provide an elastic force that causes the first member 51 to tend to move towards a first position (or downward). For example, the elastic element includes a spring 6, which provides an elastic force that causes the first member 51 to tend to move downward along a first direction. Specifically: like Figure 3 and Figure 4 As shown, in the first component 51, the shaft is basically coaxially arranged and fixed with the first component 51; a connecting block 416 is provided in the channel 411, and the shaft is movably inserted through the connecting block 416 in the first direction; the spring 6 is sleeved on the shaft, and its two ends abut against the first component 51 and the connecting block 416 respectively, thereby generating a downward elastic thrust on the first component 51.

[0057] In other words, when the first component 51 is not subjected to external force, the first component 51 is pushed by the spring 6 and abuts against the step surface 412 to block the air hole 413, so that it enters the closed state.

[0058] When the air pressure inside the second container 2 is greater than the set air pressure value (i.e., the set air pressure value), the first component 51 will be lifted upward a certain distance by overcoming the elastic force of the spring 6 under the pressure of the air pressure, thereby releasing the closure of the air hole 413. At this time, the air passage is in the open state, and the airflow inside the second container 2 can be discharged through the air passage to reduce the air pressure inside the second container 2 and prevent the second container 2 from bursting due to excessive internal air pressure.

[0059] like Figure 3 and Figure 4 As shown, the protrusion 53 is fixed on the peripheral wall of the shaft and extends basically along the radial direction of the shaft. The function of the protrusion 53 is to cooperate with the guide groove so that the pressure relief component 4 can switch between the first mode and the second mode.

[0060] In the first mode, the air passage is always kept open, allowing the second container 2 to communicate with the external environment through the air passage. The first mode is mainly used when adding liquid from the first container 1 to the second container 2 to balance the air pressure in the second container 2, so that the alkaline solution in the first container 1 can flow normally into the second container 2.

[0061] The second mode is mainly used when the pressurization system pressurizes the second container 2 to push the alkali solution into the dyeing vat. In the second mode, the air passage can switch between an open state and a closed state.

[0062] When open, the second container 2 is connected to the external environment through the air passage, that is, the first component 51 is raised a certain distance relative to the step surface 412 to remove the cover of the air hole 413.

[0063] In the closed state, the airway is closed to cut off the connection between the second container 2 and the external environment through the airway, that is, the first component 51 presses on the step surface 412 to block the air hole 413.

[0064] When the pressurization system pressurizes in the second mode, if the air pressure in the second container 2 is greater than or equal to the set air pressure value, the first component 51 is pushed open to allow the air passage to enter the open state for depressurization; when the air pressure in the second container 2 is less than the set air pressure value, the first component 51 is pressed against the step surface 412 under the action of the spring 6 to block the air hole 413, so that the air passage enters the closed state, so that there is a certain air pressure in the second container 2 to push the alkaline solution in the second container 2.

[0065] The switching between the first and second modes is mainly achieved through the circumferential rotation and vertical movement of the second component, specifically: The protrusion 53 is at least partially inserted into the guide groove, and when the protrusion 53 is in the first guide groove 414, the pressure relief component 4 enters the first mode. At this time, the protrusion 53 moves in the first guide groove 414 with the vertical movement of the first component 51 to achieve the switching between the open state and the closed state.

[0066] When the protrusion 53 enters the second guide groove 415 from the first guide groove 414, the pressure relief component 4 enters the second mode. At this time, the protrusion 53 is supported by the second guide groove 415, which means that the first component 51 is supported at a height relative to the step surface 412, so that the air passage enters the open state. In this state, the air passage is always in the open state.

[0067] The handle 54, which serves as the force-bearing part, is fixed to the shaft. By pushing or pulling the handle 54 upward, the entire second part 5 can be moved vertically. By rotating the handle 54, the entire second part 5 can be rotated circumferentially, thus achieving mode switching.

[0068] It should be understood that the various forms of processes shown above can be used to rearrange, add, or delete steps. For example, the steps described in this application can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution disclosed in this application can be achieved, and this is not limited herein.

[0069] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0070] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A device for adding dyeing alkali solution, characterized in that, include: The first container is used to store the alkaline solution; The first container has a first outlet for discharging the internal alkaline solution; The second container has a first inlet and a second outlet, the first outlet and the first inlet being connected, so that the alkali solution in the first container can flow into the second container sequentially through the first outlet and the first inlet under the action of gravity, and the second container can measure the alkali solution quantitatively; the second outlet is used to connect to the dyeing vat to input the alkali solution in the second container into the dyeing vat; The first valve is located between the first input port and the first output port to control whether the first input port and the first output port are connected or not. The second valve is used to control the opening / closing of the second outlet of the second container; A pressurization system is operably connected to a second container. When the pressurization system is turned on, it introduces airflow into the second container to pressurize the contents and push the alkali solution out of the second outlet.

2. The dyeing alkali solution adding device according to claim 1, characterized in that, The first valve is a manually operated opening / closing structure, and at least part of the peripheral wall of the second container forms a transparent area, on which scale lines are provided to indicate the liquid level in the second container.

3. The dyeing alkali solution adding device according to claim 1, characterized in that, The first valve is an electrically operated opening / closing structure controlled by a PLC; the adding device also includes a detection element capable of detecting the amount of alkali solution entering the second container, and the PLC is configured to control the first valve to close when the detection value of the detection element reaches a set value.

4. The dyeing alkali solution adding device according to claim 3, characterized in that, The detection element includes a liquid level sensor disposed in the second container and capable of detecting the liquid level in the second container; or the detection element includes an electronic flow meter disposed between the first output port and the first input port.

5. The dyeing alkali solution adding device according to claim 1, characterized in that, The pressurization system includes a compression tank storing compressed gas and a third valve. The output end of the compression tank is connected to a second container, and the third valve is used to control whether the compression tank and the second container are connected. Alternatively, the pressurization system includes an air pump, the output end of which is connected to the second container.

6. The dyeing alkali solution adding device according to claim 1, characterized in that, The second container is equipped with a pressure relief component at its top, the pressure relief component having an air passage for connecting to the second container; the pressure relief component is capable of switching between a first mode and a second mode. In the first mode, the airway remains open so that the second container can communicate with the external environment through the airway; In the second mode, the airway can switch between an open state and a closed state. In the open state, the second container is connected to the external environment through the airway; in the closed state, the airway is closed to cut off the connection between the second container and the external environment through the airway. In the second mode, the airway is configured such that when the air pressure in the second container is greater than or equal to a set air pressure value, the airway enters the open state, and when the air pressure in the second container is less than the set air pressure value, the airway enters the closed state.

7. The dyeing alkali solution adding device according to claim 6, characterized in that, The pressure relief component includes: The first part has a channel extending through it in a first direction; the channel has an annular stepped surface that protrudes radially from the inner peripheral wall of the channel, and the inner ring of the stepped surface forms an air hole. The second part includes a first component disposed within the channel and located above the step surface along a first direction; at least a portion of the outer peripheral wall of the first component and the inner peripheral wall of the channel are separated to serve as a gap allowing airflow; the first component is movable within the channel along the first direction between a first position and a second position; in the first position, the first component presses against the step surface to block the air hole; in the second position, the first component forms a gap between itself and the step surface in the first direction; An elastic element is used to provide an elastic force that causes the first member to tend to move toward a first position; The second part can rotate circumferentially relative to the first part to switch between the first mode and the second mode.

8. The dyeing alkali solution adding device according to claim 7, characterized in that, The second part further includes a protrusion, and the outer peripheral wall of the first part is provided with a guide groove. The guide groove includes a first guide groove extending along a first direction and a second guide groove arranged along the circumferential direction of the channel. The first guide groove and the second guide groove are connected. The protrusion is at least partially located in the guide groove, and the protrusion can move between the first guide groove and the second guide groove. When the protrusion is located in the first guide groove, the pressure relief component enters a first mode. In the second mode, when the protrusion is located in the second guide groove, the pressure relief component enters a second mode.

9. The dyeing alkali solution adding device according to claim 7, characterized in that, The elastic element includes a spring, which provides an elastic force that causes the first component to tend to move downward in a first direction.

10. The dyeing alkali solution adding device according to claim 7, characterized in that, A sealing element is provided between the stepped surface and the first component.

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