High-speed dispersion machine and high-speed dispersion method for water-based ink

Abstract

The invention relates to the field of high-speed dispersion equipment for water-based ink, in particular to a high-speed dispersion machine for water-based ink and a high-speed dispersion method. A high-speed dispersion machine for water-based ink comprises a rack base, an oil cylinder lifting mechanism, an impeller transmission mechanism and an impeller mechanism, the oil cylinder lifting mechanism is connected to the impeller transmission mechanism and used for driving the impeller transmission mechanism to ascend and descend, and the impeller mechanism is connected to the end of the impeller transmission mechanism to drive the impeller mechanism to partially rotate. The impeller mechanism comprises a dispersion shaft, a centering structure and an impeller structure, and the impeller structure comprises a positioning part and a plurality of impeller parts concentrically arranged around the dispersion shaft; the centering structure comprises a connecting ring and at least three connecting rod bodies surrounding the periphery of the connecting ring at equal intervals, the connecting ring is slidably connected to the dispersion shaft in a damping mode, one end of each connecting rod body is hinged to the connecting ring, and the other end of each connecting rod body is connected with each impeller part.

Description

Technical Field

[0001] The present application relates to the field of high-speed dispersion equipment for water-based inks, and particularly to a high-speed disperser and a high-speed dispersion method for water-based inks. Background Art

[0002] The core working component of a high-speed disperser is the impeller, which drives the paint slurry in the stirring tank to form a rolling circulation effect by rotating at high speed. In this dynamic process, the pigment particles on the surface layer of the paint slurry quickly sink to the bottom of the tank along a spiral trajectory, and a turbulent dense area will form in the area about 2 to 8 centimeters from the edge of the impeller. The color particles of the water-based ink in this area will be subjected to strong shear force and impact force, so as to be effectively dispersed into the paint, forming a velocity difference of up and down flow. Through continuous cyclic turning, this mechanism ensures the full mixing and dispersion of the pigment and the paint.

[0003] As Figure 1 and Figure 2 shown, taking a fast-drying water-based printing ink based on a specific low-temperature self-crosslinking epoxy-modified water-based acrylic resin as an example, usually the particles deposit at the bottom when the material is static, and its preparation process is extremely delicate and complex. This resin, with its unique low-temperature self-crosslinking performance and excellent water-based dispersibility, endows excellent adhesion and abrasion resistance in the ink formulation, but at the same time sets more stringent standards for the dispersion uniformity in the preparation process. In order to achieve an ideal laminar flow state in the lower area of the impeller, usually the end of the impeller needs to reach the optimal target position as shown in Figure 2 (usually at a certain distance above the ideal particle deposition height), and then start the circumferential speed of the impeller to reach more than 30 m / s, so as to obtain an ideal dispersion effect. Generally speaking, the circumferential speed of the impeller of the equipment is between 25 and 50 m / s, and the rotation speed can be as high as more than 1450 revolutions per minute.

[0004] To meet the preparation requirements of this special water-based ink, a super-high rotation speed is required, and an appropriate ratio needs to be maintained between the impeller diameter and the stirring tank diameter to promote better circulation of the material. However, currently on the market, usually the rotation speed of the large impeller is extremely increased, but the size of the stirring tank is ignored, which results in the formation of a huge vortex flow when the impeller rotates at high speed, and then air is mixed in, seriously destroying the laminar flow state below the impeller. In this case, not only the dispersion efficiency is greatly reduced, but also the energy consumption is extremely high; the current proposed solution is to lift and lower the impeller at high rotation speed, but considering the market price limit of the high-speed disperser, if an oil cylinder lift that can run in parallel at high rotation speed is upgraded, it is almost impossible to obtain a market share. Summary of the Invention

[0005] In view of the above, the present application provides a high-speed disperser and a high-speed dispersion method for water-based inks.

[0006] The present application provides a high-speed disperser for water-based ink, comprising a frame base, a cylinder lifting mechanism, an impeller transmission mechanism and an impeller mechanism, wherein the cylinder lifting mechanism is connected to the impeller transmission mechanism and is used to drive the impeller transmission mechanism to rise and fall, and the impeller mechanism is connected to the end of the impeller transmission mechanism to drive the impeller mechanism to rotate partially, and the impeller mechanism comprises a dispersion shaft, a centering structure and an impeller structure, wherein the impeller structure comprises a positioning portion and a plurality of impeller portions concentrically arranged around the dispersion shaft; the centering structure comprises a connecting ring and a plurality of at least three connecting rod bodies equidistantly spaced around the outer circumference of the connecting ring, the connecting ring is damped and slidably connected to the dispersion shaft, one end of the connecting rod body is hingedly connected to the connecting ring, and the other end is respectively connected to each impeller portion; wherein the dispersion shaft can rotate under the drive of the impeller transmission mechanism, the connecting rod body can change its angle under the action of centrifugal force, and the circumferential diameter and height of the impeller formed by the plurality of impeller portions change synchronously.

[0007] In a further preferred embodiment of the present application, the outer periphery of the connecting ring is provided with a plurality of hinge brackets which are arranged at equal angles and relatively protrude from the outer wall of the connecting ring, and each of the hinge brackets includes a pivot space, a connecting hole and a limit block; a single connecting rod body includes a main rod portion and a secondary rod portion, one end of the main rod portion is a first rotating shaft, and the first rotating shaft is accommodated in the pivot space and rotatably connected to the connecting hole; the limit block is arranged in the pivot space to constrain the first rotation angle of the first rotating shaft.

[0008] In a further preferred embodiment of the present application, the other end of the main rod is a second rotating shaft, and a hinge connection is formed by the second rotating shaft and the auxiliary rod; the ends of the main rod and the auxiliary rod can abut against each other when they are rotated to a preset angle relative to each other to constrain the second rotation angle; and / or the axial length of the auxiliary rod is smaller than the axial length of the main rod.

[0009] In a further preferred embodiment of the present application, the positioning portion is fixedly connected to the end of the dispersion shaft away from the impeller transmission mechanism; the impeller portions are three in number and the ends are connected to each other correspondingly, blades are arranged at the edges of the impeller portions, and the blades are respectively arranged on two opposite surfaces of the impeller portions.

[0010] In a further preferred embodiment of the present application, the periphery of the dispersion shaft includes a ring sleeve, a first limit portion and a second limit portion, and the outer wall of the ring sleeve is set to different roughness surfaces along the height direction; and the roughness gradually increases from top to bottom; the connecting ring is slidably connected to the ring sleeve, and is limited by the first limit portion and the second limit portion; when the dispersion shaft rotates to above a preset speed threshold, the connecting ring begins to continuously descend, the impeller circumferential diameter increases, and the impeller circumferential height decreases.

[0011] In a further preferred embodiment of the present application, it further includes a clamping mechanism, and the clamping mechanism includes: a mounting sleeve connected to a part of the outer wall of the oil cylinder lifting mechanism; a first clamping jaw and a second clamping jaw movably connected to the mounting sleeve through a transmission structure and capable of approaching or separating from each other; a handwheel part capable of controlling the first clamping jaw and the second clamping jaw to approach or separate from each other for clamping the stirring tank.

[0012] The second aspect of the present application also provides a high-speed dispersion method for water-based ink, including: after adding the reagent to be mixed into the stirring tank, controlling the first clamping jaw and the second clamping jaw to clamp the outer wall of the stirring tank through the handwheel part; after controlling the impeller structure to descend to a preset first target position in the stirring tank through the oil cylinder lifting mechanism, starting the impeller structure through the impeller transmission mechanism; mixing the water-based acrylic resin and deionized water according to a preset ratio, and controlling the rotation speed of the impeller structure to a preset first target speed for premixing; after premixing for a preset first duration, stopping the rotation of the impeller structure, and adding pigments in preset batches; respectively controlling the change of the rotation speed of the impeller structure to carry out the initial wetting stage, the main dispersion stage and the fine dispersion stage at different rotation speeds, wherein the handwheel part is at different heights in each stage; maintaining the rotation speed of the impeller structure at a first preset low speed and discharging materials from the stirring tank simultaneously.

[0013] In a further preferred embodiment of the present application, during the process of controlling the rotation speed of the impeller structure to a preset first target speed for premixing, it further includes: adding additives successively according to the time intervals during the premixing process.

[0014] In a further preferred embodiment of the present application, the respectively controlling the change of the rotation speed of the impeller structure to carry out the initial wetting stage, the main dispersion stage and the fine dispersion stage at different rotation speeds, wherein the handwheel part is at different heights in each stage, includes: controlling the rotation speed of the impeller structure to a preset second target speed and lasting for a second duration, so that the impeller circumferential diameter formed by the handwheel part increases and the height descends to a preset second target position for initial wetting; controlling the rotation speed of the impeller structure to gradually step up from the second target speed to a third target speed and lasting for a preset second duration for main dispersion; controlling the rotation speed of the impeller structure to gradually step up from the third target speed to a fourth target speed and lasting for a preset third duration for the fine dispersion stage.

[0015] In a further preferred embodiment of the present application, it further includes: during the initial wetting stage, the main dispersion stage and the fine dispersion stage, starting the cold water jacket sleeved on the outer wall of the stirring tank for temperature control.

[0016] In summary, the high-speed disperser and the high-speed dispersion method for water-based ink provided by the present application at least have the following beneficial effects: When the impeller drive mechanism drives the dispersion shaft to rotate, the connecting rod body changes its angle under the action of centrifugal force. This angle change causes the layout of the impeller part to change, that is, its circumferential diameter and height are adjusted synchronously. This dynamically changing impeller structure can disperse water-based ink more effectively, improving the dispersion efficiency and uniformity.

[0017] It can be understood that when the rotational speed increases, due to the mechanical characteristics of the connecting rod body, it will change its angle under the action of centrifugal force. This angle change causes the impeller part connected to the connecting rod body to move downward, and at the same time increases the circumferential diameter of the impeller. The downward movement of the impeller part makes the impeller structure closer to the bottom of the container, so that the ink particles deposited at the bottom can be dispersed more effectively, avoiding the problem of uneven dispersion. At the same time, it automatically prevents its impeller structure from being exposed to the air, improving the laminar flow effect; the increase in the circumferential diameter of the impeller increases the contact area between the impeller and the ink, thus improving the dispersion efficiency. At the same time, this change also enables the impeller to generate stronger shear force and impact force during rotation, further refining the ink particles; due to the damping sliding connection and angle variability of the connecting rod body, by designing the magnitude of the damping force, the impeller structure can be adaptively adjusted according to different rotational speeds and ink characteristics, so as to maintain the best dispersion effect under various working conditions.

[0018] Particularly, in the initial stage of water-based ink preparation, such as the wetting and initial dispersion stages, the ink particles are usually large and unevenly distributed. At this time, a lower rotational speed is required to gradually wet the ink particles and initially break their aggregates; at this time, due to the lower rotational speed, the centrifugal force acting on the connecting rod body is also smaller. At this time, the damping sliding connection between the connecting rod body and the connecting ring can absorb part of the kinetic energy, reducing unnecessary energy loss. At the same time, the angle change of the connecting rod body is also smaller, making the movement of the impeller part and the change of the circumferential diameter relatively limited, thereby reducing the movement resistance and energy consumption of the entire impeller mechanism. Description of the Drawings

[0019] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present application. For those skilled in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0020] Figure 1 It is a schematic diagram of the impeller in the prior art demonstrated by the present application under high-speed rotation; Figure 2 It is an operation node diagram of the impeller and the stirring tank in the prior art demonstrated by the present application; Figure 3 It is a side view of the high-speed disperser for water-based ink provided by the present application; Figure 4 Front view of the high-speed disperser for water-based ink provided by this application; Figure 5 Provided by this application Figure 4 Cross-sectional view of A-A in Figure 6 Top view of the impeller structure of the high-speed disperser provided by this application; Figure 7 Axonometric schematic diagram of the impeller structure of the high-speed disperser provided by this application, where the gray part is the state schematic diagram under high-speed rotation; and Figure 8 Is a schematic flow chart of the high-speed dispersion method provided by this application. Detailed implementation manners

[0021] In the description of this application, it should be understood that when terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and other terms indicating orientation or positional relationship are used, without special instructions, they are understood as the orientation or positional relationship based on the drawings shown. This is only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, so it cannot be understood as a limitation to this application.

[0022] In addition, features limited by "first" and "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Features limited by "first" and "second" may explicitly or implicitly include at least one of the limited features. When the description of "multiple" appears, the general meaning is at least including two, such as two, three, etc., unless otherwise clearly and specifically limited.

[0023] In this application, unless otherwise clearly specified and limited, when terms such as "installation", "connection", "connection", "fixation" and other terms are used, they should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection, an electrical connection, it can be directly connected, or indirectly connected through an intermediate medium, it can be the communication inside two elements or the interaction relationship between two elements. For those skilled in the art, the specific meanings of the above terms in this application can be understood according to specific situations.

[0024] In the description of this specification, terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0025] Referring to Figure 3 to the figures, the present application first provides a high-speed dispersing machine 100 for water-based ink. The high-speed dispersing machine 100 includes: a frame base 10, an oil cylinder lifting mechanism 20, an impeller transmission mechanism 30, and an impeller mechanism 40. The oil cylinder lifting mechanism 20 is connected to the impeller transmission mechanism 30 and is used to drive the impeller transmission mechanism 40 to lift. The impeller mechanism 40 is connected to the end of the impeller transmission mechanism 30 to drive a part of the impeller mechanism 40 to rotate. The impeller mechanism 40 includes a dispersion shaft 41, a centering structure 42, and an impeller structure 43. The impeller structure 43 includes a positioning portion 431 and a plurality of impeller portions 432 concentrically arranged around the dispersion shaft 41.

[0026] Based on a general inventive concept of the present application, the centering structure 42 includes a connecting ring 421 and at least three connecting rod bodies 421 equally spaced around the outer periphery of the connecting ring 421. The connecting ring 421 is connected to the dispersion shaft 41 in a damped sliding manner. One end of the connecting rod body 421 is hinged to the connecting ring 421, and the other end is respectively connected to each impeller portion 432. Among them, the dispersion shaft 41 can rotate under the drive of the impeller transmission mechanism 40, and the connecting rod body 421 can change its angle under the action of centrifugal force, and the impeller circumferential diameter and height formed by the plurality of impeller portions 432 change synchronously.

[0027] It can be understood that the frame base 10 serves as the support structure of the entire device to ensure the stable operation of the device; the oil cylinder lifting mechanism 20 is connected to the impeller transmission mechanism 30 and realizes lifting through either hydraulic pressure or air pressure, which is convenient for adjusting the working height of the impeller mechanism 40. The impeller transmission mechanism 30 transmits power to the impeller mechanism 40 to drive its rotation, and components such as a motor and a reducer can be used to realize the transmission of power and the regulation of rotational speed; The core working components of the impeller mechanism 40 include a dispersion shaft 41, a centering structure 42, and an impeller structure 43. The dispersion shaft 41 serves as the main shaft of the impeller mechanism 40, connecting and transmitting the power from the impeller drive mechanism 30. The centering structure 42 includes a connecting ring 421 and a connecting rod body 421; the connecting ring 421 is connected to the dispersion shaft 41 in a damped sliding manner, providing stable support and sliding freedom, and at the same time having a certain impedance force during its sliding process through the damping effect.

[0028] In an embodiment of the present application, the connecting rod body 421 is provided with at least three, arranged equidistantly around the outer circumference of the connecting ring 421, with one end hingedly connected to the connecting ring 421 and the other end connected to the impeller part 432. When the dispersion shaft 41 rotates, the connecting rod body 421 changes its angle under the action of centrifugal force, thereby adjusting the height and circumferential diameter of the impeller part 432.

[0029] Further, continue to refer to Figures 4 to 7 , the impeller part 432 is concentrically arranged around the dispersion shaft 41 and is connected to the connecting ring 421 through the connecting rod body 421. When the dispersion shaft 41 rotates, due to the force on the connecting rod mechanism composed of the connecting rod body 421 and the impeller part 432, the angle of the connecting rod body 421 changes, and the circumferential diameter and height of the impeller part 432 will change synchronously.

[0030] Specifically, when the impeller drive mechanism 30 drives the dispersion shaft 41 to rotate, the connecting rod body 421 changes its angle under the action of centrifugal force. This angle change causes the layout of the impeller part 432 to change, that is, its circumferential diameter and height are adjusted synchronously. This dynamically changing impeller structure can disperse the water-based ink more effectively, improving the dispersion efficiency and uniformity.

[0031] It can be understood that when the rotational speed increases, due to the mechanical characteristics of the connecting rod body 421, it will change its angle under the action of centrifugal force. This angle change causes the impeller part 432 connected to the connecting rod body to move downward, and at the same time increases the impeller circumferential diameter. The downward movement of the impeller part 432 makes the impeller structure 43 closer to the bottom of the container, so that the ink particles deposited at the bottom can be dispersed more effectively, avoiding the problem of uneven dispersion, and at the same time automatically preventing the impeller structure 43 from being exposed to the air, improving the laminar flow effect; the increase in the impeller circumferential diameter increases the contact area between the impeller and the ink, thereby improving the dispersion efficiency. At the same time, this change also enables the impeller to generate stronger shear force and impact force during rotation, further refining the ink particles; due to the damped sliding connection and angle variability of the connecting rod body 421, by designing the magnitude of the damping force, the impeller structure 43 can be adaptively adjusted according to different rotational speeds and ink characteristics, so as to maintain the best dispersion effect under various working conditions.

[0032] In particular, in the initial stage of the preparation of water-based ink, such as the wetting and initial dispersion stages, the ink particles are usually large and unevenly distributed. At this time, a lower rotational speed is required to gradually wet the ink particles and initially break up their aggregates; at this time, due to the lower rotational speed, the centrifugal force acting on the connecting rod body 421 is also smaller. At this time, the damping sliding connection between the connecting rod body 421 and the connecting ring 421 can absorb part of the kinetic energy and reduce unnecessary energy loss. At the same time, the angular change of the connecting rod body is also relatively small, making the movement of the impeller part 432 and the change in the circumferential diameter relatively limited, thereby reducing the movement resistance and energy consumption of the entire impeller mechanism.

[0033] On the outer periphery of the connecting ring 421, there are several hinge brackets a arranged at equal angular intervals and protruding relatively from the outer wall of the connecting ring 421. Preferably, the number of hinge brackets a is three.

[0034] Furthermore, each hinge bracket a in the present application includes a pivot space a1, a connecting hole a2, and a limiting block a3; a single connecting rod body 421 includes a main rod portion 421a and a secondary rod portion 421b. One end of the main rod portion 421a is a first rotating shaft, and the first rotating shaft is accommodated in the pivot space a1 and is rotatably connected to the connecting hole a2; the limiting block a3 is arranged in the pivot space a1 to restrict the first rotation angle of the first rotating shaft. Further, the other end of the main rod portion 421a is a second rotating shaft, and a hinge connection is formed with the secondary rod portion 421b through the second rotating shaft; the ends of the main rod portion 421a and the secondary rod portion 421b can abut against each other when rotating relative to each other to a preset angle to restrict the second rotation angle.

[0035] The connecting ring 421 serves as the support foundation of the entire structure. Several relatively protruding hinge brackets a are arranged at equal angular intervals on its outer periphery, which enhances the mechanical strength of the connecting ring and provides a stable connection point for the connecting rod body.

[0036] Furthermore, each hinge bracket a includes a pivot space a1, a connecting hole a2, and a limiting block a3; the pivot space a1 is used to accommodate the first rotating shaft of the connecting rod body 421, and the connecting hole a2 ensures that the first rotating shaft can rotate around the axis. The limiting block a3 functions to restrict the rotation angle of the first rotating shaft, thereby maintaining the stability and controllability of the entire structure.

[0037] The main rod portion 421a, as the main part of the connecting rod body, is designed with a first rotating shaft at one end, which is connected to the pivot space a1 and the connecting hole a2 of the hinge bracket a. The other end is designed as a second rotating shaft for forming a hinge connection with the secondary rod portion 421b, enabling the connecting rod body to rotate in two directions, increasing its flexibility and adaptability.

[0038] The secondary rod portion 421b is connected to the main body rod portion 421a through a second rotating shaft to form a hinge connection. This connection method allows the secondary rod portion 421b to have a certain angular change relative to the main body rod portion 421a, so as to adapt to different working requirements.

[0039] When the ends of the main body rod portion 421a and the secondary rod portion 421b rotate relative to each other to a preset angle, they can abut against each other to restrict the second rotation angle, ensure the angle limit during the rotation of the connecting rod body, and also prevent structural damage caused by excessive rotation.

[0040] In a further embodiment of the present application, the axial length of the secondary rod portion 421b is less than the axial length of the main body rod portion 421a; that is, the overall descending space can be restricted within a preset range by the secondary rod portion 421b; it can be understood that when the connecting rod body 421 is affected by an external force (such as centrifugal force), the overall descending space will be restricted. This restriction helps to keep the stroke of the impeller structure 43 (connected to the secondary rod portion 421b) within an effective height range, and at the same time ensures the stability of the impeller structure 43 during high-speed rotation, thereby improving the dispersion efficiency and uniformity of the disperser.

[0041] The positioning portion 431 is fixedly connected to the end of the dispersion shaft 41 away from the impeller transmission mechanism 30; the number of impeller portions 432 is three and their ends are correspondingly connected to each other. Blades are provided at the edges of the impeller portions 432, and the blades are respectively arranged on two opposite surfaces of the impeller portions 432.

[0042] The number of impeller portions 432 is three, and when their ends are correspondingly connected to each other, they can fit and dock; that is, when the impeller portions 432 are at a low speed or zero speed, the three impeller portions 432 are in a tightened state, and at this time, the ends of the impeller portions 432 at the head and tail correspond to each other to form a complete disk surface; when a certain rotational speed is reached, the three impeller portions 432 begin to separate and descend, and their outer peripheral diameters gradually increase and the relative heights gradually decrease.

[0043] It can be understood that at a low rotational speed or in a stationary state, the three impeller portions 432 form a complete disk surface and can work like a large single impeller. At this time, the required energy efficiency is the lowest, improving the driving efficiency; when the rotational speed increases, the impeller portions 432 begin to separate and descend, the outer peripheral diameter increases, and the relative height decreases, increasing the flow-through area of the fluid and reducing the fluid resistance. The separation and descent movement of the impeller portions can generate stronger shear forces and vortices, which helps to disperse the fluid more evenly in the container and enhance the mixing effect.

[0044] The outer periphery of the dispersion shaft 41 includes a collar 44, a first limiting portion 45, and a second limiting portion 46. The outer wall of the collar 44 is provided with different roughness surfaces in the height direction, and the roughness gradually increases from top to bottom. The connecting ring 421 is slidably connected to the collar 44 and is limited by the first limiting portion 45 and the second limiting portion 46. When the dispersion shaft 41 rotates above a preset speed threshold, the connecting ring 421 begins to continuously descend, the circumferential diameter of the impeller increases, and the circumferential height of the impeller decreases.

[0045] The collar 44 is located on the outer periphery of the dispersion shaft 41, and its outer wall is designed to have different roughness surfaces in the height direction.

[0046] From top to bottom, the roughness of the outer wall of the collar 44 gradually increases. This design may help provide different frictional forces during the sliding process of the connecting ring 421, thereby controlling its descending speed and achieving specific functions.

[0047] The first limiting portion 45 and the second limiting portion 46 are located at the collar 44 and are used to limit the connecting ring 421 to prevent it from detaching from the dispersion shaft 41 during the sliding process. The first limiting portion 45 and the second limiting portion 46 can be blocks or other stop structures, and their specific positions and shapes may vary according to design requirements, as long as the connecting ring 421 can slide within a predetermined range.

[0048] The connecting ring 421 is slidably connected to the collar 44, that is, the connecting ring 421 can slide up and down on the outer wall of the collar 44. When the dispersion shaft 41 rotates above a preset speed threshold, the connecting ring 421 begins to continuously descend. As the connecting ring 421 descends, the circumferential diameter of the impeller connected thereto will increase, and the circumferential height will decrease.

[0049] In the embodiment of the present application, a high-speed disperser for aqueous ink further includes a clamping mechanism 50. The clamping mechanism 50 includes a mounting sleeve 51, a first clamping jaw 52, and a second clamping jaw 53. The mounting sleeve 51 is connected to a part of the outer wall of the oil cylinder lifting mechanism 20. The first clamping jaw 52 and the second clamping jaw 53 are movably connected to the mounting sleeve 51 through a transmission structure 54 and can approach or separate from each other. A handwheel portion 55 can control the first clamping jaw 52 and the second clamping jaw 53 to approach or separate from each other to clamp the stirring tank.

[0050] The installation sleeve 51 plays a role in connection and support, and is used to connect to a part of the outer wall of the oil cylinder lifting mechanism 20; it ensures that the entire clamping mechanism 50 can move together with the oil cylinder lifting mechanism 20, so as to realize the clamping of the mixing tank at different height positions, thereby maintaining the stability of the mixing tank at high impeller speeds; the first jaw 52 and the second jaw 53 are the main executing components of the clamping mechanism 50, and are movably connected to the installation sleeve 51 through the transmission structure 54, that is, the first jaw 52 and the second jaw 53 can approach or move away from each other as needed to adapt to mixing tanks of different sizes or shapes; the user can control the transmission structure 54 by rotating the hand wheel part 55, and further control the approach or separation of the first jaw 52 and the second jaw 53. This manual operation method is simple and intuitive, facilitating the user to adjust the position of the jaws according to the actual situation.

[0051] The transmission structure 54 can adopt any one of gear transmission, worm and worm gear transmission, belt transmission or chain transmission, and can be specifically adapted according to requirements. Such as belt transmission or chain transmission for occasions where a larger transmission distance or center distance is required; if the first jaw 52 and the second jaw 53 need to move synchronously accurately and stably, then gear transmission is selected.

[0052] Such as Figure 8 , the second aspect of the present application also provides a high-speed dispersion method for water-based ink, which is applied to the above-mentioned high-speed disperser for water-based ink, and includes: Step S10, after adding the reagent to be mixed into the mixing tank, control the first jaw and the second jaw to clamp the outer wall of the mixing tank through the hand wheel part; Step S20, after controlling the impeller structure to descend to a preset first target position in the mixing tank through the oil cylinder lifting mechanism, start the impeller structure through the impeller transmission mechanism; Step S30, mix the water-based acrylic resin and deionized water according to a preset ratio, and control the rotation speed of the impeller structure to a preset first target speed for premixing; Step S40, after premixing for a preset first duration, stop the rotation of the impeller structure, and add pigments in preset batches; Step S50, respectively control the change of the rotation speed of the impeller structure to carry out the initial wetting stage, the main dispersion stage and the fine dispersion stage at different rotation speeds, wherein the impeller part is at different heights in each stage; Step S60, maintain the rotation speed of the impeller structure at a first preset low speed and discharge materials from the mixing tank at the same time.

[0053] First, the impeller part 432 is in its original state, that is, multiple impeller parts 432 are combined to form a whole; all the reagents to be mixed are added into the stirring tank; the handwheel part is used to adjust the first jaw and the second jaw to clamp the outer wall of the stirring tank to ensure the stability of the stirring tank; the clamping force of the jaws can be adjusted according to the material and size of the stirring tank. Usually, the clamping force is maintained within a certain range to ensure safety and stability, but the specific value needs to be determined according to the equipment specifications.

[0054] The impeller structure is lowered into the first target position preset in the stirring tank (such as 30 cm from the bottom of the tank) through the oil cylinder lifting mechanism, and the impeller drive mechanism is started to make the impeller start to rotate. The height of the first target position can be adjusted according to the depth of the stirring tank and the properties of the mixture. The rotation speed of the impeller at startup can be set according to the equipment specifications and the viscosity of the mixture. For example, the initial rotation speed can be set to 500 - 700 rpm.

[0055] Mix the waterborne acrylic resin and deionized water in a preset ratio (such as resin: water = 3:1), and control the impeller rotation speed to the preset first target speed (such as 800 rpm) for premixing. The premixing time can be adjusted according to the properties of the mixture and the required uniformity. Usually, the premixing time is 5 - 10 minutes.

[0056] After the premixing is completed, stop the impeller rotation, and add the pigment in batches. The amount added each time can be adjusted according to the type of pigment and the required color depth. The number of batches of pigment addition and the amount added each time need to be determined according to the specific formula. For example, it can be added in 3 batches, and the amount added each time is 30%, 40%, and 30% of the total pigment amount respectively.

[0057] Subsequently, control the change of the impeller rotation speed respectively to carry out the initial wetting stage (such as rotation speed 600 rpm, time 5 minutes), the main dispersion stage (such as rotation speed 1500 rpm, time 15 minutes), and the fine dispersion stage (such as rotation speed 3000 rpm, time 10 minutes); the rotation speed and time can be adjusted according to the type of pigment, particle size, and the required dispersion effect. The specific value of the impeller height adjustment needs to be determined according to the equipment specifications and the properties of the mixture. The height that can be reduced at different rotation speeds can be adjusted according to the friction of the damping.

[0058] It can be understood that when in the fine dispersion stage, at this time, the relative height of the impeller part 432 is reduced to the lowest, and at the same time, the overall impeller circumferential diameter is the largest.

[0059] When the pigment is completely dispersed and reaches the required fineness, maintain the impeller rotating at the first preset low speed (such as 300 rpm), and at the same time start the discharging operation. The rotation speed and time for maintaining the low speed can be adjusted according to the discharging speed and the required uniformity of the mixture. Usually, the low - speed maintenance time is the whole process of the discharging process or until the mixture is completely discharged.

[0060] After being processed by the above high-speed dispersion method, the pigment particles in the water-based ink can be evenly dispersed in the mixture of resin and water, forming a delicate and uniform ink. Moreover, by varying the rotational speed at different stages, the circumferential diameter of the impeller gradually increases, and at the same time, the impeller part 432 gradually decreases, which can save energy consumption in the non-ultra-high-speed stage, and effectively prevent the impeller from being exposed to the air in the high-speed stage, ensuring the laminar flow state below the impeller. In summary, the high-speed disperser for water-based ink reduces the power under the overall process, prevents the impeller from being exposed to the air, and achieves excellent dispersion effects.

[0061] Further, during the process of controlling the rotational speed of the impeller structure to a preset first target speed for premixing, it further includes: Step S31: Add additives sequentially according to the time intervals during premixing.

[0062] According to the formulation requirements and desired properties of the water-based ink, select appropriate additives. These additives may include defoamers, leveling agents, thickeners, etc., which are used to improve the printing performance and stability of the ink. During premixing, through a specific adding device or manually, the additives are added into the stirring tank in accordance with the preset amount and time intervals in sequence. The addition of additives should be uniform and continuous to avoid uneven ink performance caused by excessive or insufficient local concentration. During the process of adding additives, closely monitor the mixing situation in the stirring tank. If uneven mixing or abnormal phenomena (such as bubbles, precipitation, etc.) are found, parameters such as rotational speed, time interval, or additive addition amount should be adjusted in a timely manner.

[0063] By adding Step S31 to add additives sequentially according to the time intervals during premixing, the dispersion effect and performance of the water-based ink can be further optimized, the uniformity and stability of the ink can be improved, and it helps to achieve a more efficient and high-quality printing effect.

[0064] In Step S50, for the high-speed dispersion method of water-based ink, the rotational speed change of the impeller structure is controlled respectively to carry out the initial wetting stage, main dispersion stage, and fine dispersion stage at different rotational speeds, where the impeller part is at different heights in each stage, including: Step S51: Control the rotational speed of the impeller structure to a preset second target speed for a second duration, so that the circumferential diameter of the impeller formed by the impeller part increases, and the height decreases to a preset second target position for initial wetting. Step S52: Control the rotational speed of the impeller structure to gradually step up from the second target speed to a third target speed for a preset second duration for main dispersion. Step S53: Control the rotational speed of the impeller structure to gradually step up from the third target speed to a fourth target speed for a preset third duration. The circumferential diameter of the impeller formed by the impeller part reaches the extreme value, and the height decreases to the lowest third target position for the fine dispersion stage.

[0065] Control the rotational speed of the impeller structure to a preset second target speed and maintain for a second duration; during this stage, the circumferential diameter formed by the impeller part will increase (this is usually due to the enhanced hydrodynamic effect caused by the increased rotational speed, which enables the fluid around the impeller to be driven more effectively, forming a larger circumferential motion range), and at the same time, the height of the impeller is reduced to a preset second target position. Such a setting helps the pigment particles to come into contact with the mixture of resin and water more fully, achieving preliminary wetting and dispersion to ensure the uniform distribution of the pigment particles in the mixture, and preparing for the subsequent main dispersion stage.

[0066] Control the rotational speed of the impeller structure to gradually step up from the second target speed to a third target speed and maintain for a preset second duration.

[0067] During this stage, the gradually increasing rotational speed will enhance the shear force, which helps to further disperse the pigment particles to a smaller size. At the same time, due to the increased rotational speed, the hydrodynamic effect around the impeller will also be enhanced, making the dispersion more uniform; by increasing the rotational speed and enhancing the shear force, effective dispersion of the pigment particles in the mixture is achieved, improving the uniformity and stability of the ink. However, during this stage, due to the effect of frictional damping, the impeller part will not descend but maintain the original second target position to reduce power consumption.

[0068] Subsequently, gradually step up the rotational speed of the impeller structure from the third target speed to a fourth target speed and maintain for a preset third duration. During this stage, the circumferential diameter formed by the impeller part may reach the limit value of the equipment (affected by the limit of the connecting rod body), and at the same time, the height of the impeller (or its working part) is reduced to the lowest third target position; by further increasing the rotational speed and enhancing the shear force, as well as optimizing the height and circumferential diameter of the impeller, fine dispersion of the pigment particles in the mixture is achieved, ensuring the fineness of the ink and the printing effect.

[0069] By precisely controlling parameters such as the rotational speed, height, and circumferential diameter of the impeller structure, and combining with a multi-stage dispersion strategy, efficient, uniform, and fine dispersion of water-based ink can be achieved while taking into account energy consumption.

[0070] The high-speed dispersion method for water-based ink further includes: Step 54, during the initial wetting stage, main dispersion stage, and fine dispersion stage, start the temperature control of the cold water jacket sleeved on the outer wall of the stirring tank.

[0071] It is understandable that during the dispersion process, due to factors such as shear force and friction, the temperature in the stirring tank may rise. Temperature control is carried out through a cold water jacket, which can effectively prevent the temperature from being too high, thereby avoiding the agglomeration or degradation of pigment particles due to heat and ensuring the stability of the ink; at an appropriate temperature, the mixing effect of pigment particles and resin is better and the dispersion efficiency is higher. The cold water jacket can ensure that the dispersion process is carried out within the optimal temperature range, thereby improving the dispersion efficiency and the quality of the ink.

[0072] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present application. Those skilled in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present application.

Claims

1. A high-speed disperser for water-based ink, comprising a frame base (10), a cylinder lifting mechanism (20), an impeller transmission mechanism (30) and an impeller mechanism (40), wherein the cylinder lifting mechanism (20) is connected to the impeller transmission mechanism (30) and is used to drive the impeller transmission mechanism (40) to rise and fall, and the impeller mechanism (40) is connected to the end of the impeller transmission mechanism (30) to drive part of the impeller mechanism (40) to rotate, characterized in that: The impeller mechanism (40) comprises a dispersion shaft (41), a centering structure (42), and an impeller structure (43); the impeller structure (43) comprises a positioning portion (431) and a plurality of impeller portions (432) arranged concentrically around the dispersion shaft (41); The centering structure (42) comprises a connecting ring (421) and at least three connecting rod bodies (421) equidistantly spaced around the outer circumference of the connecting ring (421); the connecting ring (421) is connected to the dispersion shaft (41) in a damping sliding manner; one end of the connecting rod body (421) is hinge-connected to the connecting ring (421), and the other end is respectively connected to each impeller part (432); The dispersion shaft (41) can rotate under the drive of the impeller transmission mechanism (40), the connecting rod body (421) can change its angle under the action of centrifugal force, and the circumferential diameter and height of the impeller formed by the plurality of impeller parts (432) can change synchronously.

2. The high-speed disperser for water-based ink according to claim 1, characterized in that: The outer periphery of the connecting ring (421) is provided with a plurality of hinge brackets (a) which are arranged at equal angles and relatively protrude from the outer wall of the connecting ring (421), and each of the hinge brackets (a) comprises a pivot space (a1), a connecting hole (a2) and a limit block (a3); The single connecting rod body (421) comprises a main rod portion (421a) and a secondary rod portion (421b), one end of the main rod portion (421a) is a first rotating shaft, and the first rotating shaft is accommodated in the pivot space (a1) and is rotatably connected to the connecting hole (a2); The limit block (a3) ​​is arranged in the pivot space (a1) to constrain a first rotation angle of the first rotating shaft.

3. The high-speed disperser for water-based ink according to claim 2, characterized in that: The other end of the main rod portion (421a) is a second rotating shaft, and a hinge connection is formed with the auxiliary rod portion (421b) through the second rotating shaft; when the ends of the main rod portion (421a) and the auxiliary rod portion (421b) are relatively rotated to a preset angle, they can abut against each other to constrain a second rotation angle; and / or The axial length of the auxiliary rod portion (421b) is smaller than the axial length of the main rod portion (421a).

4. The high-speed disperser for water-based ink according to claim 2, characterized in that: The positioning portion (431) is fixedly connected to the end of the dispersion shaft (41) facing away from the impeller transmission mechanism (30); The impeller parts (432) are three in number and their ends correspond to each other and can fit together. Blades are arranged at the edges of the impeller parts (432), and the blades are respectively arranged on two opposite surfaces of the impeller parts (432).

5. The high-speed disperser for water-based ink according to claim 2, characterized in that: The outer periphery of the dispersion shaft (41) comprises a ring sleeve (44), a first limiting portion (45) and a second limiting portion (46); the outer wall of the ring sleeve (4) is arranged to have different roughness surfaces along the height direction; and the roughness gradually increases from top to bottom; the connecting ring (421) is slidably connected to the ring sleeve (44) and is limited by the first limiting portion (45) and the second limiting portion (46); When the dispersion shaft (41) rotates to a speed above a preset threshold, the connection ring (421) begins to continuously descend, the impeller circumferential diameter increases, and the impeller circumferential height decreases.

6. The high-speed disperser for water-based ink according to any one of claims 1 to 5, characterized in that: It also includes a clamping mechanism (50), wherein the clamping mechanism (50) includes: A mounting sleeve (51) connected to a portion of the outer wall of the oil cylinder lifting mechanism (20); The first clamping jaw (52) and the second clamping jaw (53) are movably connected to the mounting sleeve (51) via a transmission structure (54) and can move closer to or farther away from each other; The hand wheel part (55) can be used to control the first clamping jaw (52) and the second clamping jaw (53) to move closer to or farther from each other, so as to clamp the stirring tank.

7. A high-speed dispersion method for water-based ink, applied to the high-speed disperser for water-based ink according to any one of claims 1 to 6, characterized in that: include: After adding the reagent to be mixed into the stirring tank, the first clamp and the second clamp are controlled by the hand wheel to clamp the outer wall of the stirring tank; After the impeller structure is controlled to be lowered to a preset first target position in the mixing tank by the oil cylinder lifting mechanism, the impeller structure is started by the impeller transmission mechanism; Mixing water-based acrylic resin and deionized water in a preset ratio, and controlling the rotation speed of the impeller structure to a preset first target speed for premixing; After a preset first period of premixing, the impeller structure is stopped and the pigment is added in preset batches; The rotation speed of the impeller structure is controlled to change respectively, so as to carry out the initial wetting stage, the main dispersion stage and the fine dispersion stage at different rotation speeds, wherein the impeller part is located at a different height in each stage; The rotation speed of the impeller structure is maintained at a first preset low speed and the material is discharged simultaneously in the stirring tank.

8. The high-speed dispersion method for water-based ink according to claim 7, characterized in that: In the process of controlling the rotation speed of the impeller structure to a preset first target speed for premixing, the process also includes: During the premixing process, add additives in sequence according to the time intervals.

9. The high-speed dispersion method for water-based ink according to claim 7, characterized in that: The rotation speed change of the impeller structure is controlled respectively to perform the initial wetting stage, the main dispersion stage and the fine dispersion stage at different rotation speeds, wherein the impeller part is located at a different height in each stage, including: Controlling the rotation speed of the impeller structure to a preset second target speed for a second time period so that the circumferential diameter of the impeller formed by the impeller portion increases and the height decreases to a preset second target position for initial wetting; Controlling the rotation speed of the impeller structure to gradually increase from the second target speed to a third target speed for a preset second time period to perform main dispersion; The rotation speed of the impeller structure is controlled to gradually increase from the third target speed to the fourth target speed for a preset third time period, the impeller circumferential diameter formed by the impeller portion reaches an extreme value, and the height is reduced to the lowest third target position to perform a fine dispersion stage.

10. The high-speed dispersion method for water-based ink according to claim 7, characterized in that: Also includes: During the initial wetting stage, the main dispersion stage and the fine dispersion stage, the cold water jacket provided on the outer wall of the stirring tank is started to control the temperature.

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