A mixing processing method and device based on multi-physical field cooperation

Abstract

The application discloses a mixing processing method and device based on multi-physical field cooperation, which comprises a double rotor with a special topological surface structure formed by the tangent line of a convex circular arc and a concave circular arc, and a pair of high and low convex ridges formed on the surface of the rotor, wherein the high convex ridge is tangent to the inner circle of the rotor, and the low convex ridge has a certain gap with the inner circle of the stator; the two rotors are relatively engaged and rotated to form high and low pressure cavities, which respectively have a strong compression and negative pressure absorption effect on the material in the cavities, so that the material is forced to flow periodically in a compression-release mode; meanwhile, the symmetrical assembly of double plungers is linearly reciprocated to intensify the periodic pulsating flow of the material, so that the polymer low-temperature forced mixing processing process is realized in cooperation with the engagement movement of the double rotors and the reciprocating movement of the double plungers; and water or other small molecules can be introduced to utilize the special flow field circulation to induce the forced penetration and pressure release expansion of the small molecules, so that the processing temperature is effectively reduced, the plasticizing time is shortened, and the mixing quality and product performance are improved.

Description

TECHNICAL FIELD

[0001] The embodiment of the application relates to the technical field of high polymer material processing, and particularly relates to a mixing processing method and device based on synergistic action of multiple physical fields. BACKGROUND

[0002] At present, high polymer materials play an extremely important role in life, and are modified and processed by using different processing methods and equipment to meet actual demands. Common processing methods mainly include extrusion, injection, calendering and mixing, etc. However, when the high polymer materials are processed by using the processing methods, the high polymer materials have problems of low heat conduction efficiency in the processing process, long time required for the melting plasticizing process and poor mixing and dispersing effect, which greatly affect the mechanical properties of the high polymer material products.

[0003] With more and more attention paid to degradable biomass materials such as starch, wood powder, straw and lignin and the continuous emergence of high-performance functional materials, the actual demand for environment-friendly, multifunctional and high-quality high polymer materials and composite materials is higher and higher, which puts forward higher requirements for the high polymer material processing field technology. Therefore, the processing equipment must meet the requirements of the emerging new materials and new processing technology. At present, the common means of most high polymer material processing is based on heat conduction and shear drag rheology, and these processing methods can cause local high shear of the processed materials, thereby causing the degradation and scorching of the high polymer materials, especially for the bio-based high polymer materials, the phenomenon is more likely to occur because the bio-based high polymer materials contain more hydrogen bonds in the intramolecular and intermolecular, and the decomposition temperature is close to the melting temperature, so that the materials are difficult to be thermoplastically processed. SUMMARY

[0004] The following is a summary of the subject matter of the detailed description. This summary is not intended to limit the scope of the claims.

[0005] The embodiment of the application provides a mixing processing method and device based on synergistic action of multiple physical fields, which can reduce the processing temperature required by the high polymer materials, strengthen the material stretching action, accelerate the material melting plasticizing process, improve the material mixing and dispersing effect and the mixing quality.

[0006] The first aspect of the embodiment of the present application provides a mixing processing device based on multi-physical field synergy, which comprises a mixing chamber, a rotor and a stator arranged in the mixing chamber, a first driving device for driving the rotor, double plungers symmetrically arranged at two ends in the mixing chamber, and a second driving device for driving the double plungers, the cross-section structure of the rotor is a topological surface structure formed by the tangent line of a convex circular arc and a concave circular arc, the surface of the rotor forms a high ridge and a low ridge, the high ridge is tangent to the inner circle of the rotor, and the low ridge has a certain gap with the inner circle of the stator, the rotor comprises a left rotor and a right rotor, the first driving device is used for driving the left rotor and the right rotor to make relative meshing rotary motion, so as to form a high-pressure cavity and a low-pressure cavity in the inner cavity of the stator, and the second driving device is used for driving the double plungers to make linear reciprocating motion in the mixing chamber.

[0007] In some embodiments, the gap ranges from 5um to 50um.

[0008] In some embodiments, the first driving device comprises a driving motor, a speed reducer, a shaft coupling, a transmission box and double rotors connected in sequence.

[0009] In some embodiments, the second driving device is a linear motor, which drives the double plungers symmetrically and concentrically arranged on both sides of the stator to make linear reciprocating motion in the mixing chamber.

[0010] In some embodiments, the linear reciprocating motion comprises linear same-direction reciprocating motion and linear opposite-direction reciprocating motion.

[0011] In some embodiments, it further comprises a rotating hand wheel and a pressing rod, the mixing chamber is provided with a feeding port at the upper end, the pressing rod penetrates through the feeding port, and the rotating hand wheel controls the up-down motion of the pressing rod to realize the feeding and pressing actions in the mixing chamber.

[0012] In some embodiments, it further comprises a discharging device, the discharging device comprises a lower jack and a discharging door, the lower jack is fixedly connected with the discharging door, and the discharging door is threadedly connected to the bottom of the mixing chamber.

[0013] In some embodiments, the vibration frequency and amplitude of the double plungers are adjustable, the adjustable range of the vibration frequency is 5Hz to 100Hz, and the adjustable range of the amplitude is 1mm to 10mm.

[0014] The second aspect of the embodiment of the present application provides a mixing processing method based on multi-physical field synergy, which is applied to the mixing processing device of the first aspect, and the method comprises the following steps.

[0015] The left rotor and the right rotor relatively meshing rotation forms high and low pressure cavities, respectively produces strong compression and negative pressure absorption effect on materials in the cavities, and forces the materials to do periodic compression-release flow; at the same time, the symmetrical assembled double plungers do linear reciprocating motion, intensifies the periodic pulsating flow of the materials, and realizes the polymer material low-temperature forced mixing process of the double rotor meshing motion and the double plunger reciprocating motion. By introducing small molecules, the special flow field circulation is used to induce the forced penetration-pressure release expansion of the small molecules, to periodically compress-release volume cooperates with the series of explosion effects induced by steam blasting, and intensifies the plasticizing mixing effect of the materials.

[0016] In some embodiments, the polymer material includes bio-based polymer material and polymer general material, the bio-based polymer material includes starch, wood powder, straw and lignin, and the polymer general material includes PE plastic and PP plastic; the small molecule substance includes water, ethanol and liquid nitrogen.

[0017] The embodiment of the present application comprises: a mixing processing device comprises a mixing chamber, a rotor and a stator arranged inside the mixing chamber, a first driving device for driving the rotor, double plungers symmetrically arranged at both ends inside the mixing chamber, and a second driving device for driving the double plungers, the cross-sectional structure of the rotor is a topological surface structure formed by the tangent of convex circular arc and concave circular arc, the surface of the rotor forms high ridges and low ridges, the high ridges are tangent to the inner circle of the rotor, and the low ridges have a certain gap with the inner circle of the stator, the rotor comprises a left rotor and a right rotor, the first driving device is used to drive the left rotor and the right rotor to do relative meshing rotation, so as to form a high pressure cavity and a low pressure cavity in the inner cavity of the stator, produce strong compression effect on the polymer material entering the meshing gap (high pressure cavity), and form negative pressure absorption effect on the connected low pressure cavity due to the increase of the volume, so as to realize the periodic compression-release flow processing of the polymer material. The second driving device is used to drive the double plungers to do linear reciprocating motion inside the mixing chamber, further intensify the periodic compression-release flow behavior of the materials in the chamber, and realize the polymer low-temperature forced mixing processing process of the double rotor meshing motion and the double plunger reciprocating motion, greatly accelerate the melting, mixing and dispersion process of the materials, and effectively improve the mixing quality and product performance of the polymer material. Based on this, the device can reduce the required processing temperature of the polymer material, strengthen the stretching effect of the material, accelerate the melting and plasticizing process of the material, and improve the mixing and dispersion effect and mixing quality of the material.

[0018] Other features and advantages of the present application will be set forth in the following description, and in part will become apparent to those skilled in the art from the description, or can be learned by practice of the present application. The objects and other advantages of the present application can be achieved and obtained by the structure particularly pointed out in the description, claims and drawings. BRIEF DESCRIPTION OF DRAWINGS

[0019] The accompanying drawings are included to provide a further understanding of the technical solutions of the present application, constitute a part of the specification and are used to explain the technical solutions of the present application together with the embodiments of the present application, and do not constitute a limitation on the technical solutions of the present application.

[0020] Figure 1 A structure schematic diagram of a mixing processing device provided by an embodiment of the present application is shown in the figure.

[0021] Figure 2 A structure schematic diagram of each chamber region in a mixing chamber provided by an embodiment of the present application is shown in the figure.

[0022] Figure 3 A structure schematic diagram of a left rotor provided by an embodiment of the present application is shown in the figure.

[0023] Figure 4 A structure schematic diagram of a right rotor provided by an embodiment of the present application is shown in the figure.

[0024] Figure 5 A processing process schematic diagram provided by an embodiment of the present application is shown in the figure. DETAILED DESCRIPTION

[0025] In order to make the objectives, technical solutions and advantages of the present application clearer, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application, and do not limit the present application.

[0026] It should be understood that, in the description of the embodiments of the present application, the meaning of multiple (or multiple items) is more than two, greater than, less than, more than, and the like are understood as not including the number, above, below, and the like are understood as including the number. If it is described as "first", "second", and the like, it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or the sequence of indicated technical features.

[0027] In order to solve the technical problems of low heat conduction efficiency, long time required for melting and plasticizing process and poor mixing and dispersion effect of polymer materials in the prior art during processing of polymer materials, the present application provides a mixing processing method and device based on multi-physical field synergy, which comprises a mixing chamber, a rotor and a stator arranged in the mixing chamber, a first driving device for driving the rotor, and double plungers symmetrically arranged at both ends of the mixing chamber and a second driving device for driving the double plungers. The cross-sectional structure of the rotor is a topological surface structure formed by the tangent line of a convex circular arc and a concave circular arc. The surface of the rotor forms a high ridge and a low ridge. The high ridge is tangent to the inner circle of the rotor, and the low ridge has a certain gap with the inner circle of the stator. The rotor comprises a left rotor and a right rotor. The first driving device is used to drive the left rotor and the right rotor to make relative meshing rotary motion, so as to form a high-pressure cavity and a low-pressure cavity in the inner cavity of the stator. The second driving device is used to drive the double plungers to make linear reciprocating motion in the mixing chamber. Specifically, the rotor with a special topological surface structure formed by the tangent line of a convex circular arc and a concave circular arc forms a pair of high and low ridges on the surface of the rotor. The high ridge is tangent to the inner circle of the rotor, and the low ridge has a certain gap with the inner circle of the stator. The two rotors are relatively meshed and rotated to form a high-pressure cavity and a low-pressure cavity in the inner cavity of the stator. The high-pressure cavity has a strong compression effect on the polymer material entering the meshing gap. The low-pressure cavity connected to the high-pressure cavity has a negative pressure absorption effect due to the increase in volume, so as to realize the periodic compression-release flow processing of the polymer material. At the same time, the symmetrically arranged double plungers make linear reciprocating motion, which further intensifies the periodic compression-release flow behavior of the material in the cavity, so as to realize the high polymer low-temperature forced mixing processing process of the double-rotor meshing motion and the double-plunger reciprocating motion. The melting, mixing and dispersion process of the material is greatly accelerated, and the mixing quality and product performance of the polymer material are effectively improved. In addition, free water and other small molecules can be introduced into the mixing chamber, and the periodic strong compression-release effect in the chamber can be used to cyclically induce the penetration-expansion behavior of the small molecules, so as to produce steam explosion and further intensify the plasticizing mixing effect of the material.

[0028] In some embodiments, the driving motor, the speed reducer, the shaft coupling, the transmission box and the double rotors are sequentially connected. The driving motor rotates to drive the double rotors to make relative meshing rotary motion. The double plungers are symmetrically and concentrically arranged on both sides of the stator and are preferably driven by a linear motor to make linear reciprocating motion. Alternatively, a plunger pump, a vibration exciter or other driving units can be used to provide reciprocating motion.

[0029] In some embodiments, the rotating hand wheel, the pressing rod and the feeding port are sequentially connected. The rotating hand wheel controls the up-down motion of the pressing rod to realize the feeding and pressing actions.

[0030] In some embodiments, the discharging device comprises a lower ram and a discharging door, the lower ram is fixedly connected with the discharging door, and the discharging door is screwed on the bottom of the mixing chamber.

[0031] In some embodiments, the rotor has a high-low circular-arc convex ridge, and the cross-sectional structure of the rotor is a special topological cross-sectional structure formed by the tangent of the convex circular arc and the concave circular arc.

[0032] In some embodiments, the low convex ridge of the rotor has a certain gap with the inner circle of the mixing processing device stator, and the size of the gap is preferably 10 um, and the design range can be 5-50 um.

[0033] In some embodiments, the vibration frequency and amplitude of the plunger can be adjusted, the vibration frequency can be adjusted in the range of 5-100 Hz, and the amplitude can be adjusted in the range of 1-10 mm; the movement mode of the double plunger is preferably the same direction reciprocating motion, and can also be adjusted to the opposite direction reciprocating motion.

[0034] In some embodiments, the action strength and mode of the high polymer material can be synergistically controlled by synchronously adjusting the rotor speed and the movement mode of the double plunger.

[0035] It should be noted that the device is particularly suitable for processing biological-based high polymer materials such as starch, wood powder, straw, and lignin, and can also be used for general high polymer materials such as PE and PP, but is not limited to these materials. The small molecule material added is preferably a small molecule substance such as water, ethanol, and liquid nitrogen. It should be pointed out that by introducing the small molecule substance, steam explosion can be generated, so that the periodic volume compression-release synergizes with the series of explosion effects caused by steam explosion, further intensifying the plasticizing and mixing effect of the material.

[0036] The embodiment of the application also provides a mixing processing method based on multi-physical field synergistic effect, which is applied to the mixing processing device, and the method comprises the following steps of:

[0037] The left rotor and the right rotor are relatively engaged and rotated to form high and low pressure cavities, respectively producing strong compression and negative pressure absorption effects on the materials in the cavities, and forcing the materials to flow periodically; meanwhile, the linear reciprocating motion of the symmetrically assembled double plungers intensifies the periodic pulsating flow of the materials, and realizes the low-temperature forced mixing processing of the high polymer material by the synergistic movement of the double-rotor engagement and the double-plunger reciprocation; by introducing small molecule substances, the forced penetration-pressure release expansion of the small molecule substances is caused by the special flow field circulation, so that the series of explosion effects caused by the periodic volume compression-release synergizes with steam explosion, and the plasticizing and mixing effect of the material is intensified.

[0038] Compared with the existing high polymer material processing equipment, the application has the following beneficial effects:

[0039] (1) The relative engagement rotation of the special topological surface structure rotor and the symmetrical arrangement of the double plunger linear reciprocating motion are mutually coordinated to form a high-pressure cavity and a low-pressure cavity in the mixing chamber, which produces compression and absorption effect on the polymer material entering the engagement gap, intensifies the periodic compression-release effect of the material in the cavity, realizes the polymer low-temperature forced mixing process of the double-rotor engagement motion and the double-plunger reciprocating motion, greatly speeds up the melting, mixing and dispersion process of the material, and effectively improves the mixing quality and product performance of the polymer material.

[0040] (2) The special flow field is used to cause steam explosion of small molecule substances such as water, ethanol and liquid nitrogen, and the series of explosion effects caused by the periodic volume compression-release coordination steam explosion further intensify the plasticizing mixing effect of the material.

[0041] (3) The temperature required for processing is reduced, the stretching effect of the material is strengthened, the melting and plasticizing process of the material is accelerated, the dispersion and mixing effect of the material is improved, and the product mixing quality is improved, especially suitable for plasticizing and mixing of biological polymer materials such as starch, PVA and lignin.

[0042] The mixing processing device of the present application will be described below in combination with the drawings and specific embodiments.

[0043] As shown in Figures 1 to 4 , the mixing processing device comprises a pressing rod 1, a rotating hand wheel 2, a feeding port 3, an upper machine body 4, a left rotor 5, a lower machine body 6, a right rotor 7, a double plunger 8, a mixing space 9, a lower jack 10, a discharge door 11, a mixing chamber 12; the pressing rod 1, the rotating hand wheel 2, the feeding port 3, the mixing chamber 12, the stator 17. Among them, the mixing chamber 12, the upper machine body 4, the lower machine body 6, the double plunger 8, the left rotor 5 and the right rotor 7 form the mixing space 9, the mixing space 9 is divided into chamber A 13, chamber B 14, chamber C 15 and chamber D 16 by two rotors, the mixing space 9 forms a discharge gap on the side facing the discharge door 11, and the mixing space 9 forms a feeding port 3 on the side away from the discharge door 11. The pressing rod 1 and the rotating hand wheel 2 are fixedly connected, and the lower jack 10 and the discharge door 11 are fixedly connected.

[0044] Example one

[0045] In this embodiment, the rotating hand wheel 2 controls the up-down movement of the pressing rod 1 to realize the feeding and pressing action, the pressing rod 5 enters the feeding port 3 to provide pressure for the material in the mixing space 9, the discharging device comprises a lower jack 10 and a discharge door 11, and the discharge door 11 is opened by controlling the lower jack 10 to move downward during discharging, and the lower jack 10 is controlled to move upward to close the discharge door 11 after discharging is completed.

[0046] When the polymer material needs to be mixed, rotate the rotating handle 2 to drive the pressure rod 1 to press the polymer material from the feeding port 3; drive the motor to drive the left rotor 5 and the right rotor 7 to rotate relative to each other, so that the polymer material pressed from the feeding port 3 enters the cavity B14 formed by the two rotors; as the two rotors are driven by the motor to rotate relative to each other, the polymer material moves from the cavity B14 to the cavities A13, C15 and D16; the cavity B14 is a high-pressure cavity, while the cavities A13, C15 and D16 are low-pressure cavities, so that the polymer material is subjected to compression-release effect. As the rotors continue to rotate, the pressure inside the cavities A13 and D16 gradually increases, and the polymer material is again subjected to suction force into the cavity B14, and the cycle continues. At the same time, the driving motor drives the symmetrically assembled double plunger 8 to move linearly, and the volume of the cavity of the mixing space 9 changes from large to small and then from small to large with each linear reciprocating motion of the double plunger 8, further intensifying the periodic compression-release flow behavior of the material in the cavity, thereby realizing the polymer low-temperature forced mixing process of the double-rotor meshing motion and the double-plunger reciprocating motion, greatly accelerating the melting, mixing and dispersion process of the material, effectively improving the mixing quality and product performance of the polymer material; further improving the mixing capacity of the mixing device for the polymer material, thereby realizing the purpose of efficient mixing of the polymer material.

[0047] Example two

[0048] When the polymer material is mixed based on the mixing method and device, small molecules such as water, ethanol and liquid nitrogen can be introduced to strengthen the plasticizing ability of the polymer material and make the mixing and dispersion more uniform by using the process of volume periodic compression-release and explosion effect caused by steam explosion. The specific mixing process is shown in the following figure: Figure 5As shown, when the polymer material and small molecule substances such as water are mixed into the mixing chamber 12 to engage the chambers B14 of the left rotor 5 and the right rotor 7, the pressure of the polymer material and small molecule substances such as water in the chamber B14 gradually increases with the engagement of the two rotors, and the polymer material and small molecule substances such as water move to the low-pressure chamber A13 and the chamber C15 to be compressed and released. At the same time, the small molecule substances such as water are heated during the mixing process of the mixing device to produce steam explosion. The symmetrically assembled double plunger 8 driven by the driving motor moves linearly, so that the pressure in the mixing space 9 forms a cycle from small to large and then from large to small, further intensifying the periodic compression-release flow behavior of the materials in the chamber. Through the synergistic effect of the mutual rotation of the two rotors, the steam explosion of the small molecule substances such as water, and the linear reciprocating motion of the symmetrically assembled double plunger 8, the mixture of several polymer materials in the mixing chamber 12 experiences a series of explosion effects caused by periodic volume compression-release and synergistic steam explosion. Under the synergistic effect of the external force generated by the periodic volume compression-release and the internal force generated by the steam explosion effect, the double-rotor engagement motion and the double-plunger reciprocating motion are realized, and the low-temperature forced mixing process of the polymer is carried out. This greatly accelerates the melting, mixing and dispersion process of the material, effectively improves the mixing quality of the polymer material and the performance of the product, and prepares a high-performance and uniformly mixed polymer.

[0049] The above is a specific description of the preferred embodiment of the present application, but the present application is not limited to the above-mentioned embodiments. Those skilled in the art can make various equivalent modifications or replacements without departing from the spirit of the present application, and these equivalent modifications or replacements are all included in the scope defined by the claims of the present application.

Claims

1. A mixing process based on the synergistic effect of multiple physical fields, characterized in that, This invention relates to a mixing apparatus, comprising a mixing chamber, a rotor and a stator disposed within the mixing chamber, a first drive device for driving the rotor, two plungers symmetrically mounted at both ends of the mixing chamber, and a second drive device for driving the two plungers. The rotor has a cross-sectional structure in which convex and concave circular arcs are tangent to each other, forming a topological curved surface. The rotor surface has high and low convex ridges; the high convex ridges are tangent to the inner circle of the rotor, and the low convex ridges have a certain gap with the inner circle of the stator. The rotor includes a left rotor and a right rotor. A first driving device drives the left and right rotors to perform relative meshing rotational motion to form a high-pressure chamber and a low-pressure chamber within the stator. A second driving device drives the dual plungers to perform linear reciprocating motion within the mixing chamber. The device also includes a rotating handwheel and a pressure rod. A feeding port is located at the upper end of the mixing chamber, and the pressure rod passes through the feeding port. The rotating handwheel controls the up-and-down movement of the pressure rod to achieve feeding and pressing actions within the mixing chamber. The method includes: The left and right rotors mesh and rotate relative to each other to form high and low pressure chambers, which respectively exert strong compression and negative pressure absorption on the material in the chambers, forcing the material to undergo periodic compression-release flow. At the same time, the symmetrically assembled double plungers perform linear reciprocating motion, which intensifies the periodic pulsating flow of the material, realizing a low-temperature forced mixing process of polymer materials in which the meshing motion of the double rotors and the reciprocating motion of the double plungers are coordinated. By introducing small molecule substances, the forced permeation-decompression expansion of small molecule substances is induced by a special flow field circulation, and the series of explosion effects caused by the periodic volume compression-release synergistic steam explosion are intensified to enhance the plasticizing and mixing of the material.

2. The mixing method according to claim 1, characterized in that, The gap ranges from 5µm to 50µm.

3. The mixing method according to claim 1, characterized in that, The first drive device includes a drive motor, a reducer, a coupling, a transmission box, and a dual rotor connected in sequence.

4. The mixing method according to claim 1, characterized in that, The second driving device is a linear motor, which drives the symmetrically and concentrically assembled double plungers on both sides of the stator to perform linear reciprocating motion inside the mixing chamber.

5. The mixing method according to claim 4, characterized in that, The linear reciprocating motion includes linear reciprocating motion in the same direction and linear reciprocating motion in opposite directions.

6. The mixing method according to claim 1, characterized in that, It also includes a discharge device, which includes a bottom bolt and a discharge gate. The bottom bolt is fixedly connected to the discharge gate, and the discharge gate is threaded to the bottom of the mixing chamber.

7. The mixing method according to claim 1, characterized in that, The vibration frequency and amplitude of the dual plungers are adjustable, with the adjustable range of the vibration frequency being 5 Hz to 100 Hz and the adjustable range of the amplitude being 1 mm to 10 mm.

8. The mixing method according to claim 1, characterized in that, The small molecule substances include water, ethanol, and liquid nitrogen.

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