A dyeing kettle

Abstract

The application discloses a dyeing kettle and relates to the technical field of textile printing and dyeing.The dyeing kettle comprises a support, a kettle body fixed on the support, a second discharge pipe arranged on the top end side wall of the kettle body, a cover body used for closing the top end opening of the kettle body, a double-head structure, a plurality of material through holes uniformly distributed on the connecting ring, a first head edge fixedly and sealingly connected with the bottom end opening of the kettle body, a first head provided with a feeding pipe and a first discharge pipe, a dyeing assembly comprising a dyeing base and a plurality of dyeing shaft pipes fixed on the dyeing base, and the double-head structure comprises a first head, a second head and a connecting ring, the first head edge is fixedly connected with the outer ring of the connecting ring, the second head edge is fixedly connected with the inner ring of the connecting ring, a semispherical cavity is formed between the first head and the second head, and the connecting ring is uniformly provided with the plurality of material through holes.

Description

Technical Field

[0001] This invention relates to the field of textile printing and dyeing technology, and in particular to a dyeing kettle. Background Technology

[0002] Supercritical CO2 anhydrous dyeing technology, as a novel dyeing technology, has made phased progress, and its combined research on process conditions, dyeing mechanism, and dyeing equipment is relatively mature. Compared with conventional water bath dyeing, supercritical CO2 fluid dyeing is anhydrous, additive-free, and inexpensive throughout the entire process. It has the advantages of fast dyeing speed and high dyeing rate. After dyeing, the remaining dye and CO2 in the system can be recycled, truly achieving zero emissions and zero pollution in dyeing and finishing, fully embodying the modern production concept of cleanliness, greenness, and environmental protection.

[0003] Supercritical CO2 fluid dyeing technology relies primarily on the unique quadrupole structure of CO2 molecules—linear nonpolar molecules with two symmetrical polar bonds—which strongly influences its thermodynamic properties. Through the principle of like dissolves like, CO2 fluid in a supercritical state can dissolve nonpolar or low-polarity raw dye powders and carry the dye molecules to dye the fabric. In supercritical carbon dioxide anhydrous dyeing systems, the dyeing kettle is a crucial piece of equipment, serving as a container for dyeing and storing fibers. Its structure and the uniformity of fluid distribution directly affect the dyeing evenness of the fabric.

[0004] Existing supercritical CO2 fluid dyeing kettles generally adopt a bottom-in, top-out configuration, with an outlet located at a certain point on the top of the kettle. This causes the fluid in the kettle to converge towards the outlet, resulting in an uneven distribution of the fluid flow field within the kettle and leading to poor dyeing uniformity of the dyed fabrics. There is an urgent need to develop a dyeing kettle that can fundamentally solve the problem of uneven fluid flow field distribution. Summary of the Invention

[0005] The purpose of this invention is to provide a dyeing vessel to solve the problems existing in the prior art and improve the uniformity of the fluid flow field distribution in the dyeing vessel.

[0006] To achieve the above objectives, the present invention provides the following solution:

[0007] This invention provides a dyeing vessel, comprising:

[0008] support;

[0009] The vessel body is fixed on the support, and the top and bottom ends of the vessel body are provided with openings. A second discharge pipe is provided on the top side wall of the vessel body.

[0010] A lid for closing the top opening of the vessel body;

[0011] The double-head structure includes a first head, a second head, and a connecting ring. Both the first head and the second head are hemispherical shells, with the radius of the first head being larger than that of the second head. The edge of the first head is fixedly connected to the outer ring of the connecting ring, and the edge of the second head is fixedly connected to the inner ring of the connecting ring. Both the first head and the second head have upward openings, and a hemispherical cavity is formed between them. The connecting ring has multiple feed ports evenly distributed on it, which connect the hemispherical cavity to the inner cavity of the vessel body. The edge of the first head is fixedly and sealed to the bottom opening of the vessel body. The first head is provided with an inlet pipe and a first outlet pipe. The top end of the inlet pipe passes through the second head and is connected to a fluid distributor. The bottom end of the inlet pipe is located outside the vessel body. One end of the first outlet pipe is located outside the vessel body, and the other end is connected to the hemispherical cavity.

[0012] A dyeing assembly includes a dyeing base and several dyeing shaft tubes fixed on the dyeing base. The dyeing shaft tubes are hollow, closed at the top and open at the bottom. The dyeing base is provided with a through hole corresponding to each dyeing shaft tube, and the through hole communicates with the bottom opening of the corresponding dyeing shaft tube. The side wall of the dyeing shaft tube is provided with multiple discharge holes. The dyeing base can be mounted at the opening of the second end cap, and the dyeing base and the second end cap are sealed together.

[0013] Preferably, a sealing ring is fixedly provided on the bottom surface of the cover, and when the cover is placed over the top opening of the vessel body, the edge of the sealing ring is sandwiched between the cover and the vessel body.

[0014] Preferably, it also includes a hoop ring, which includes two semi-circular sub-hoops, and the two sub-hoops can be fastened together by bolts;

[0015] The top of the vessel body is provided with a first annular protrusion, and the top of the cover body is provided with a second annular protrusion. When the cover body is placed over the top opening of the vessel body, the bottom surface of the second annular protrusion fits against the top surface of the first annular protrusion. The inner wall of each sub-ring is provided with a semi-annular groove. The sum of the thickness of the first annular protrusion and the thickness of the second annular protrusion is equal to the width of the semi-annular groove. The ring is used to fit on the first annular protrusion and the second annular protrusion.

[0016] Preferably, a temperature measuring tube is also provided in the middle of the vessel body.

[0017] Preferably, a sealing ring is fixed to the top of the inner wall of the second end cap, and the sealing ring can abut against the side of the dyeing base.

[0018] Preferably, the dyeing assembly further includes a hoisting assembly, which includes a fixed shaft, a rotating shaft, a fixed ring, and a lifting ring. The bottom end of the fixed shaft is fixedly connected to the center of the dyeing base. The bottom of the rotating shaft is threadedly connected to the top of the fixed shaft. The connecting ring is fixed to the top of the rotating shaft. A connecting bolt is threadedly connected to the lifting ring, and the connecting bolt passes through the fixed ring. The lifting ring is able to rotate relative to the fixed ring.

[0019] Preferably, the dyeing shaft tubes are arranged vertically, and all the dyeing shaft tubes are evenly distributed.

[0020] Preferably, the feed pipe is vertically arranged, and both the first discharge pipe and the second discharge pipe are inclined. The end of the first discharge pipe away from the first end cap is lower than the other end of the first discharge pipe, and the end of the second discharge pipe away from the vessel body is lower than the other end of the second discharge pipe.

[0021] The present invention achieves the following technical effects compared to the prior art:

[0022] When the dyeing kettle of the present invention is in use, the downward flowing fluid in the kettle body can flow into the hemispherical cavity through the feed port on the connecting ring, and finally flow out through the first discharge pipe. Since the feed ports on the connecting ring are evenly distributed along the circumference of the connecting ring, the downward flowing fluid in the kettle body can flow evenly to each feed port, thereby improving the uniformity of fluid distribution in the kettle body.

[0023] Furthermore, the dyeing kettle of the present invention has two flow field distribution forms during use: bottom inlet and top outlet, and bottom inlet and bottom outlet, which can be applied to a variety of dyeing processes.

[0024] Furthermore, the bottom-in, top-out flow field specifically involves supercritical CO2 fluid entering the fluid distributor through the feed pipe, flowing out of the fluid distributor and then entering several dyeing shaft pipes, where the fluid is evenly diffused within the dyeing vessel, and finally flowing upwards and exiting through the second discharge pipe.

[0025] Furthermore, the bottom-in, bottom-out flow field is as follows: supercritical CO2 fluid enters the fluid distributor through the feed pipe, and after flowing out of the fluid distributor, the supercritical CO2 fluid enters several dyeing shaft tubes. The fluid distributor ensures that the flow rate and velocity of the supercritical CO2 fluid entering each dyeing shaft tube are consistent. The fluid is evenly diffused into the dyeing vessel through multiple dyeing shaft tubes, and the downward-flowing fluid flows into the hemispherical cavity through the feed port on the connecting ring, and finally flows out through the first discharge pipe. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the dyeing vessel of the present invention;

[0028] Figure 2 This is a schematic diagram of the connecting ring in the dyeing vessel of the present invention;

[0029] Figure 3 This is a schematic diagram of the dyeing assembly in the dyeing vessel of the present invention;

[0030] Figure 4 The flow field trace diagram of an existing bottom-in, top-out dyeing kettle;

[0031] Figure 5 The flow field trace diagram of an existing bottom-in, top-out dyeing kettle;

[0032] Figure 6 This is a trace diagram of the flow field in the dyeing vessel of the present invention;

[0033] Figure 7 This is a trace diagram of the flow field in the dyeing vessel of the present invention;

[0034] Among them, 100 is the dyeing kettle; 1 is the kettle body; 2 is the first end cap; 3 is the second end cap; 4 is the dyeing base; 5 is the connecting ring; 6 is the sealing ring; 7 is the feed pipe; 8 is the first discharge pipe; 9 is the fluid distributor; 10 is the dyeing shaft pipe; 11 is the temperature measuring pipe; 12 is the second discharge pipe; 13 is the feed port; 14 is the cover; 15 is the sealing ring; 16 is the sub-hoop ring; 17 is the bracket; 18 is the fixed shaft; 19 is the rotating shaft; 20 is the fixed ring; 21 is the lifting ring; and 22 is the connecting bolt. Detailed Implementation

[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] The purpose of this invention is to provide a dyeing vessel to solve the problems existing in the prior art and improve the uniformity of the fluid flow field distribution in the dyeing vessel.

[0037] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0038] Example 1

[0039] like Figures 1 to 7 As shown, this embodiment provides a dyeing kettle 100, including a support 17, a kettle body 1, a cover 14, a double-sealed structure, and a dyeing assembly.

[0040] The vessel body 1 is fixed on the support 17. Openings are provided at the top and bottom of the vessel body 1. A second discharge pipe 12 is provided on the top side wall of the vessel body 1.

[0041] The cover 14 is used to seal the top opening of the vessel body 1; the cover 14 is fixedly connected to the vessel body 1 by a hoop, the hoop including two semi-circular sub-hoops 16, the two sub-hoops 16 can be fastened together by bolts; the top of the vessel body 1 is provided with a first annular protrusion, and the top of the cover 14 is provided with a second annular protrusion. When the cover 14 is placed on the top opening of the vessel body 1, the bottom surface of the second annular protrusion fits against the top surface of the first annular protrusion; the inner wall of each sub-hoop 16 is provided with a semi-annular groove, the sum of the thickness of the first annular protrusion and the thickness of the second annular protrusion is equal to the width of the semi-annular groove, and the hoop is used to fit on the first annular protrusion and the second annular protrusion. (Refer to...) Figure 1 After the top opening of the vessel body 1 is sealed with the cover 14, two sub-rings 16 are fitted onto the first and second annular protrusions, so that the first and second annular protrusions are located in the semi-annular grooves of the sub-rings 16. Then, the two sub-rings 16 are fastened together with bolts. The first and second annular protrusions are limited by the semi-annular grooves on the sub-rings 16, thereby limiting the cover 14 so that the cover 14 can tightly seal the top opening of the vessel body 1.

[0042] In the optional embodiments of this example, a sealing ring 15 is preferably fixed to the bottom surface of the cover 14. When the cover 14 is placed over the top opening of the vessel body 1, the edge of the sealing ring 15 is sandwiched between the cover 14 and the vessel body 1. The sealing ring 15 is preferably made of rubber. During the dyeing process, the rubber sealing ring 15 expands due to heat, which can further improve the sealing performance between the cover 14 and the vessel body 1.

[0043] The double-head structure includes a first head 2, a second head 3, and a connecting ring 5. Both the first head 2 and the second head 3 are hemispherical shells. The radius of the first head 2 is larger than that of the second head 3. The edge of the first head 2 is fixed to the outer ring of the connecting ring 5, and the edge of the second head 3 is fixed to the inner ring of the connecting ring 5. Both the first head 2 and the second head 3 have their openings facing upwards, and a hemispherical cavity is formed between the first head 2 and the second head 3. Multiple feed ports 13 are evenly distributed on the connecting ring 5. The feed ports 13 connect the hemispherical cavity to the inner cavity of the vessel body 1. The edge of the first head 2 is fixed and sealed to the bottom opening of the vessel body 1 (preferably by welding). The first head 2 is provided with a feed pipe 7 and a first discharge pipe 8. The top end of the feed pipe 7 passes through the second head 3 and is connected to a fluid distributor 9. The bottom end of the feed pipe 7 is located outside the vessel body 1. One end of the first discharge pipe 8 is located outside the vessel body 1, and the other end is connected to the hemispherical cavity.

[0044] The dyeing assembly includes a dyeing base 4 and several dyeing shaft tubes 10 fixed on the dyeing base 4. The dyeing shaft tubes 10 are hollow, closed at the top and open at the bottom. The dyeing base 4 is provided with a through hole corresponding to each dyeing shaft tube 10. The through hole communicates with the bottom opening of the corresponding dyeing shaft tube 10. The side wall of the dyeing shaft tube 10 is provided with multiple discharge holes. The dyeing base 4 can be mounted at the opening of the second end cap 3, and the dyeing base 4 and the second end cap 3 are sealed together.

[0045] In the optional embodiments of this example, a sealing ring 6 is preferably fixed to the top of the inner wall of the second end cap 3. The sealing ring 6 can abut against the side of the dyeing base 4, and the sealing ring 6 enhances the sealing between the dyeing base 4 and the sealing ring 6.

[0046] In the optional scheme of this embodiment, a more preferred embodiment is that a temperature measuring tube 11 is also provided in the middle of the vessel body 1, and the temperature measuring tube 11 is used to measure the temperature inside the vessel body 1.

[0047] In the optional embodiments of this example, the dyeing assembly further includes a hoisting assembly. The hoisting assembly includes a fixed shaft 18, a rotating shaft 19, a fixed ring 20, and a lifting ring 21. The bottom end of the fixed shaft 18 is fixedly connected to the center of the dyeing base 4. The bottom of the rotating shaft 19 is threadedly connected to the top of the fixed shaft 18. A connecting ring 5 is fixedly mounted on the top of the rotating shaft 19. The axis of the fixed ring 20 is horizontal. A connecting bolt 22 is threadedly connected to the lifting ring 21, and the connecting bolt 22 passes through the fixed ring 20. The lifting ring 21 can rotate relative to the fixed ring 20.

[0048] It should be noted that the lifting assembly is designed to facilitate the placement of the dyeing assembly into or out of the reactor body 1 via the lifting ring 21. Furthermore, it prevents gaps from forming between the dyeing base 4 and the second end cap 3 and sealing ring 6 due to the lift force of the fluid. Specifically, since the bottom of the rotating shaft 19 is threadedly connected to the top of the fixed shaft 18, the height of the fixed ring 20 can be adjusted by rotating the rotating shaft 19. Before dyeing, the height of the fixed ring 20 is adjusted by rotating the rotating shaft 19 so that the cover 14 is positioned... After the top of the vessel body 1 is opened, the bottom surface of the cover 14 can be in close contact with the top of the fixing ring 20. In this way, the cover 14 presses the fixing ring 20, the rotating shaft 19, the fixing shaft 18 and the dyeing base 4 together, so that the dyeing base 4 is in close contact with the second end cap 3 and the sealing ring 6, which enhances the sealing between the dyeing base 4 and the second end cap 3 and the sealing ring 6. It can also prevent the dyeing base 4 from jumping due to the lift of the fluid during the dyeing process, which would cause gaps between the dyeing base 4 and the second end cap 3 and the sealing ring 6.

[0049] In the optional schemes of this embodiment, it is more preferred that the dyeing shaft tubes 10 are arranged vertically and all dyeing shaft tubes 10 are evenly distributed.

[0050] In the optional scheme of this embodiment, it is more preferred that the feed pipe 7 is arranged vertically, and the first discharge pipe 8 and the second discharge pipe 12 are both arranged at an inclination. The end of the first discharge pipe 8 away from the first end cap 2 is lower than the other end of the first discharge pipe 8, and the end of the second discharge pipe 12 away from the vessel body 1 is lower than the other end of the second discharge pipe 12.

[0051] The specific usage method of the dyeing kettle 100 in this embodiment is as follows:

[0052] Before dyeing, the dyeing assembly is first lifted out of the kettle body 1 by the lifting ring 21. Then, the fabric to be dyed is wound around each dyeing shaft tube 10. After winding, the dyeing assembly is dropped into the kettle body 1 by the lifting ring 21, so that the dyeing base 4 falls exactly on the top opening of the second end cap 3. Then, the height of the fixing ring 20 is adjusted by rotating the rotating shaft 19 so that after the cover 14 is placed at the top opening of the kettle body 1, the bottom surface of the cover 14 can be in close contact with the top of the fixing ring 20. Then, the cover 14 is placed on the top opening of the kettle body 1. Then, the two sub-hoops 16 are both fitted on the first annular protrusion and the second annular protrusion, so that the first annular protrusion and the second annular protrusion are located in the semi-annular groove of the sub-hoops 16. Then, the two sub-hoops 16 are fastened together with bolts.

[0053] Then, supercritical CO2 fluid is introduced into the reactor body 1 through the feed pipe 7. After flowing out of the fluid distributor 9, the supercritical CO2 fluid enters each dyeing shaft pipe 10 evenly. The supercritical CO2 fluid is evenly diffused in the dyeing reactor 100 through the dyeing shaft pipe 10 (while passing through the fabric to be dyed for dyeing). Then, the upward-flowing supercritical CO2 fluid flows out through the second discharge pipe 12; the downward-flowing supercritical CO2 fluid flows into the hemispherical cavity through the feed port 13 on the connecting ring 5, and finally flows out through the first discharge pipe 8. During the dyeing process, the downward-flowing fluid in the reactor body 1 can flow into the hemispherical cavity through the feed port 13 on the connecting ring 5, and finally flows out through the first discharge pipe 8. Since the feed ports 13 on the connecting ring 5 are evenly distributed along the circumference of the connecting ring 5, the downward-flowing fluid in the reactor body 1 can flow evenly to each feed port 13, thereby improving the uniformity of fluid distribution in the reactor body 1.

[0054] A trace refers to the trajectory of some fixed points in a fluid over time as the fluid moves. By examining a trace diagram, one can intuitively understand the uniformity of the flow field distribution and whether there are any blind spots.

[0055] Figure 4 and Figure 5 This is a trace diagram of the flow field in an existing bottom-in, top-out dyeing kettle, from... Figure 4 and Figure 5 It can be seen that the trace enters from the lower port, passes through the distributor and enters the yarn tube. After flowing out of the yarn tube, the trace converges at the upper outlet pipe of the vessel. The traces all converge on the outlet side, resulting in a fluid flow blind zone on the other side of the vessel.

[0056] Figure 6 and Figure 7 This is a trace diagram of the flow field in the dyeing vessel 100 of this embodiment, by... Figure 6 and Figure 7 It can be seen that the trace enters from the lower port, passes through the distributor and enters the yarn tube (i.e., the dyeing shaft tube 10). After the trace flows out of the dyeing shaft tube 10, it flows evenly into each feed port 13 around the connecting ring. The trace is distributed in the area where the dyeing shaft tube 10 is located in the reactor body 1, and there is no fluid flow blind zone.

[0057] In the supercritical dyeing process, based on the principle of "like dissolves like," dye molecules dissolve in the supercritical fluid. The supercritical fluid carries the dye into the dyeing vessel, transporting it to the non-crystalline region of the fiber to achieve mass transfer, thereby dyeing the textiles on the yarn tube. In the traditional bottom-in, top-out dyeing vessel structure, there is a fluid flow blind zone in the yarn tube within the vessel, preventing the dye from undergoing mass transfer. This results in color differences in the textiles on the yarn tube, leading to uneven color after dyeing and failing to meet production requirements. In contrast, in this embodiment, the downward-flowing fluid in the dyeing vessel 1 can flow into the hemispherical cavity through the feed inlet 13 on the connecting ring 5 and finally out through the first discharge pipe 8. Since the feed inlets 13 on the connecting ring 5 are evenly distributed along the circumference of the connecting ring 5, the downward-flowing fluid in the vessel 1 can flow evenly to each feed inlet 13, thereby improving the uniformity of fluid distribution in the vessel and avoiding the existence of flow blind zones.

[0058] Example 2

[0059] This embodiment provides a dyeing kettle, which has a basically the same structure as the dyeing kettle in Embodiment 1. Based on Embodiment 1, the dyeing kettle in this embodiment also has the following features:

[0060] The dyeing vessel in this embodiment has multiple second discharge pipes 12, and all the second discharge pipes 12 are evenly distributed along the circumference of the vessel body 1. This makes the flow field of the supercritical CO2 fluid flowing upward in the vessel body 1 more uniform as it flows out of the second discharge pipes 12, that is, it improves the uniformity of fluid distribution in the bottom-in, top-out flow field in the vessel body 1. Specifically, the bottom-in, top-out flow field is as follows: the supercritical CO2 fluid enters the fluid distributor 9 through the feed pipe, and after flowing out of the fluid distributor 9, the fluid enters several dyeing shaft pipes 10. The fluid is evenly diffused in the vessel body 1 through the dyeing shaft pipes 10, and the upward-flowing fluid in the vessel body 1 flows out through the second discharge pipes 12.

[0061] In the description of this invention, it should be noted that the terms "center," "top," "bottom," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0062] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A dyeing kettle, characterized in that, include: support; The vessel body is fixed on the support, and the top and bottom ends of the vessel body are provided with openings. A second discharge pipe is provided on the top side wall of the vessel body. A lid for closing the top opening of the vessel body; The double-head structure includes a first head, a second head, and a connecting ring. Both the first head and the second head are hemispherical shells, with the radius of the first head being larger than that of the second head. The edge of the first head is fixedly connected to the outer ring of the connecting ring, and the edge of the second head is fixedly connected to the inner ring of the connecting ring. Both the first head and the second head have upward openings, and a hemispherical cavity is formed between them. The connecting ring has multiple feed ports evenly distributed on it, which connect the hemispherical cavity to the inner cavity of the vessel body. The edge of the first head is fixedly and sealed to the bottom opening of the vessel body. The first head is provided with an inlet pipe and a first outlet pipe. The top end of the inlet pipe passes through the second head and is connected to a fluid distributor. The bottom end of the inlet pipe is located outside the vessel body. One end of the first outlet pipe is located outside the vessel body, and the other end is connected to the hemispherical cavity. A dyeing assembly includes a dyeing base and several dyeing shaft tubes fixed on the dyeing base. Each dyeing shaft tube is hollow, closed at the top, and open at the bottom. The dyeing base has a through hole corresponding to each dyeing shaft tube, and the through hole communicates with the bottom opening of the corresponding dyeing shaft tube. The side wall of each dyeing shaft tube has multiple discharge holes. The dyeing base is mounted at the opening of a second end cap. A sealing ring is fixed at the top of the inner wall of the second end cap, and the sealing ring abuts against the side of the dyeing base to achieve a sealed connection between the dyeing base and the second end cap. The dyeing assembly also includes a hoisting assembly, which includes a fixed shaft, a rotating shaft, a fixed ring, and a lifting ring. The bottom end of the fixed shaft is fixedly connected to the center of the dyeing base. The bottom of the rotating shaft is threadedly connected to the top of the fixed shaft. The fixed ring is fixedly mounted on the top of the rotating shaft. A connecting bolt is threadedly connected to the lifting ring, and the connecting bolt passes through the fixed ring. The lifting ring rotates relative to the fixed ring. When the cover is placed over the top opening of the vessel body, the bottom surface of the cover is in close contact with the top of the fixing ring, so as to press the fixing ring, rotating shaft, fixing shaft and dyeing base by the cover, so that the dyeing base is in close contact with the sealing ring; the dyeing shaft tube is vertically arranged and all the dyeing shaft tubes are evenly distributed.

2. The dyeing kettle according to claim 1, characterized in that: A sealing ring is fixed on the bottom surface of the cover, and when the cover is placed over the top opening of the vessel body, the edge of the sealing ring is sandwiched between the cover and the vessel body.

3. The dyeing kettle according to claim 1, characterized in that: It also includes a hoop ring, which comprises two semi-circular sub-hoops, and the two sub-hoops are fastened together by bolts; The top of the vessel body is provided with a first annular protrusion, and the top of the cover body is provided with a second annular protrusion. When the cover body is placed over the top opening of the vessel body, the bottom surface of the second annular protrusion fits against the top surface of the first annular protrusion. The inner wall of each sub-ring is provided with a semi-annular groove. The sum of the thickness of the first annular protrusion and the thickness of the second annular protrusion is equal to the width of the semi-annular groove. The ring is used to fit on the first annular protrusion and the second annular protrusion.

4. The dyeing kettle according to claim 1, characterized in that: A temperature measuring tube is also installed in the middle of the vessel.

5. The dyeing kettle according to claim 1, characterized in that: The feed pipe is vertically arranged, and the first discharge pipe and the second discharge pipe are both inclined. The end of the first discharge pipe away from the first end cap is lower than the other end of the first discharge pipe, and the end of the second discharge pipe away from the vessel body is lower than the other end of the second discharge pipe.

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