Novel spiral sheet type unfolding and closing kneading self-cleaning device for multi-shaft horizontal reactor

Abstract

The invention discloses a novel spiral sheet type unfolding and folding kneading self-cleaning device for a multi-shaft horizontal reactor, which comprises 2-4 groups of kneading stirring shaft assemblies, each kneading stirring shaft assembly consists of a spiral sheet kneading unit and two to four mandrels, the mandrels are arranged in a line in the horizontal direction, the mandrels operate in the same direction, and the spiral sheet type unfolding and folding kneading self-cleaning device is arranged in the horizontal direction. 5-20 screw sheet kneading units are fixed on each core shaft in a penetrating and sleeving manner at equal intervals in the axis direction, each screw sheet kneading unit consists of a supporting piece and screw sheets distributed on the periphery of the edge of the supporting piece, and each screw sheet mainly comprises a screw sheet sharp corner and six surfaces, namely a screw sheet outer curved surface, a screw sheet inner curved surface, a screw sheet tail long surface, a screw sheet tail short surface and two screw sheet side surfaces; the direction opposite to the sharp corner of the screw piece is the same as the rotation direction, the sharp corner of the screw piece faces forwards during operation, and the joint point of the short face of the tail of the screw piece and the long face of the tail of the screw piece is behind. By means of the three-dimensional spiral sheet type units, resistance is reduced, meanwhile, when the mandrel rotates to drive the spiral sheets, the rotating scraping and sweeping capacity of the spiral sheets is higher, compared with a plane type rotor, the spiral sheets have the dead zone of the back face of the rotor, all-directional self-cleaning can be achieved through the spiral sheets, and materials are effectively prevented from being deposited on the device.

Description

Technical Field

[0001] The invention relates to a screw-type spreading, kneading and self-cleaning device, in particular to a novel screw-type spreading, kneading and self-cleaning device for a multi-axis horizontal reactor. Background Art

[0002] When performing devolatilization operations or polymerization reactions of materials, the reaction and devolatilization equipment currently commonly used include: tubular reactors, stirred tank reactors, reaction / devolatilization type twin-screw extruders and horizontal reactors.

[0003] The horizontal reactor is particularly suitable for the reaction or devolatilization production process of high-viscosity materials because it has a larger working volume and heat exchange area to adapt to high-viscosity materials, excellent interface renewal ability, mass transfer and heat transfer ability and self-cleaning ability.

[0004] At present, the working units used for stirring and mixing materials in horizontal reactors include planar rotor structures such as spiked rakes, spiral ribbons, teeth, and E-type rotors. Among them, the E-type hook has better mixing and self-cleaning functions, but still has the following disadvantages: this type of rotor has defects when producing materials with extremely high viscosity and melt strength, and cannot form complete self-cleaning between the hooks and the hooks, and between the hooks and the shaft.

[0005] Due to the insufficient self-cleaning ability of the rotor, a certain amount of high-viscosity material will still stick to the rotor; or the material will stick to the back of the hook, forming dead zone material accumulation. The long-term residence of the accumulated material will lead to uneven product polymerization or cause the material to decompose under long-term heat. When the material accumulation is serious, the entire pair of rotors will be wrapped in the material, which will affect the film-drawing effect on the material and reduce the reaction / devolatilization effect. At the same time, the excessive thickness of the material layer will also increase the resistance to the rotor and the motor load. Therefore, it is necessary to provide a new self-cleaning device to solve the above problems. Summary of the invention

[0006] In order to solve the problem of the limitation of the self-cleaning ability of the reactor rotor, the present invention provides a novel spiral blade type spreading kneading self-cleaning device for a multi-axis horizontal reactor.

[0007] The present invention provides the following technical solutions: A novel spiral blade type spreading kneading self-cleaning device for a multi-axis horizontal reactor comprises 2-4 groups of kneading stirring shaft assemblies, wherein the kneading stirring shaft assemblies consist of spiral blade kneading units and mandrels, wherein the mandrels have 2-4 pieces and are arranged in a straight line in the horizontal direction, and the mandrels rotate in the same direction, and each mandrel is sleeved and fixed with 5-20 spiral blade kneading units at equal intervals along the axial direction, and the spiral blade kneading units consist of a support member and spiral blades distributed circumferentially on the edge of the support member, and the spiral blades mainly include spiral blade tip corners and 6 surfaces, which are spiral blade outer curved surface, spiral blade inner curved surface, spiral blade tail long surface, spiral blade tail short surface and two spiral blade side surfaces, and the direction facing the spiral blade tip corners is the same as the rotation direction, and the spiral blade tip corners face forward during operation, and the joining point of the spiral blade tail short surface and the spiral blade tail long surface is at the rear.

[0008] Furthermore, the spiral slices are distributed on the circumference of the edge of the support and are fixed to the top of the edge of the support by mechanical connection or welding. Each spiral slice kneading unit has 3-6 spiral slices in the circumferential direction of the edge of the support, and the sharp corners of the spiral slices face the same rotation direction. The support members on each core shaft are arranged axially along the core shaft direction, and the support members on two adjacent core shafts are staggered with each other.

[0009] Furthermore, there is an angle θ between the thrust surface of the screw blade on the kneading and stirring shaft assembly and the axis direction of the core shaft, the angle θ ranges from 5-20°, the gap f between the outer curved surface of the screw blade and the side shaft core shaft ranges from 1≦f≦20mm, and the gap g between the side surface of the screw blade and the end surface of the support member of the side shaft ranges from 1≦g≦20mm.

[0010] Furthermore, the spiral slice kneading unit and the core shaft are both provided with heat medium flow channels, and the heat medium flows through the flow channels to heat the kneading and stirring shaft assembly.

[0011] Further, the relationship between the outer diameter D of the kneading stirring shaft assembly and the outer diameter d of the core shaft is: D=i×d, i is the depth ratio coefficient of the screw blade kneading stirring shaft assembly, the design value range of i is 2-2.7, the outer diameter D of the kneading stirring shaft is determined according to the value of the center distance L, and the relationship between the center distance L and the outer diameter D of the kneading stirring shaft and the outer diameter d of the core shaft is: center distance L= , kneading stirring shaft aspect ratio: l / D=4:1-8:1, l The kneading stirring shaft length is 80-1100mm, and the kneading stirring shaft assembly rotates in the same direction with differential speed. The speed ratios between the shafts are: double-axis differential speed ratio 4:5, three-axis differential speed ratio 4:5:4, and four-axis differential speed ratio 4:5:4:5. The design range of the center distance L is 80-1100mm, and the speed range of the kneading stirring shaft assembly is 2-100rpm.

[0012] Furthermore, the length of each spiral blade is determined according to the lead S, the lead S range is 2300-42000mm, and the angle θ between each spiral blade and the axial direction is 5-20°. The longer the lead S is, the smaller the angle θ is.

[0013] Compared with the prior art, the present invention has the following beneficial effects: For ultra-high viscosity materials and lump materials, the present invention replaces the original planar hook claws, such as E-type, tooth-type and other structures, with three-dimensional screw-type units. Specifically: the screw-type mixing unit adopts a three-dimensional structure with sharp angles and multiple curved surfaces. The three-dimensional structure with sharp angles and curved surfaces is conducive to the mixing unit inserting and cutting ultra-high viscosity materials or lump materials, reducing the resistance of the materials to the mixing unit; replacing it with a three-dimensional screw-type unit reduces the resistance while, when the core shaft rotates and drives, the screw blade has a stronger operating scraping ability. Compared with a planar rotor with a dead zone on the back of the rotor, the screw blade can achieve all-round self-cleaning, effectively preventing the material from being deposited on the device.

[0014] The curved three-dimensional structure of the screw blade can also perform excellent mixing, stretching / film drawing, slitting / shearing on the high melt strength mass melt, forming a unique "expansion and kneading" function, further improving its reaction / devolatilization efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a structural diagram of the four-claw screw blade kneading unit of the new screw blade type spreading and kneading self-cleaning device of the present invention.

[0016] Figure 2 It is a front view of the four-claw screw blade kneading unit of the novel screw blade type spreading and kneading self-cleaning device of the present invention.

[0017] Figure 3 It is a top view of the four-claw screw blade kneading unit of the novel screw blade type spreading and kneading self-cleaning device of the present invention.

[0018] Figure 4 It is a left view of the four-claw screw blade kneading unit of the novel screw blade type spreading kneading self-cleaning device of the present invention.

[0019] Figure 5 This is a structural diagram of the five-claw screw blade kneading unit of the new screw blade type spreading and kneading self-cleaning device of the present invention.

[0020] Figure 6 It is a front view of the five-claw screw blade kneading unit of the novel screw blade spreading and kneading self-cleaning device of the present invention.

[0021] Figure 7 It is a top view of the five-claw screw blade kneading unit of the novel screw blade type spreading and kneading self-cleaning device of the present invention.

[0022] Figure 8 It is a left view of the five-claw screw blade kneading unit of the novel screw blade type spreading and kneading self-cleaning device of the present invention.

[0023] Fig. 9 The parameters of the novel spiral blade type expansion kneading self-cleaning device and the clearance diagram with the barrel (taking the horizontal three-axis reactor as an example) of the present invention.

[0024] Fig.10 This is a main operating diagram of the new screw-type spreading kneading self-cleaning device of the present invention (the circle represents the meshing area between the screw and the support member, taking three axes as an example, the same below).

[0025] Fig.11 This is the operating guide diagram of the new spiral blade type spreading kneading self-cleaning device of the present invention.

[0026] Fig.12 This is a cross-sectional diagram of the operating position of the novel spiral blade type spreading kneading self-cleaning device of the present invention.

[0027] In the figure: 101, support member, 102, spiral blade tip, 103, spiral blade outer curved surface, 104, spiral blade inner curved surface, 105, spiral blade tail long surface, 106, spiral blade tail short surface, 107, spiral blade side, 108, barrel, 109, barrel jacket, 201, mandrel one, 202, mandrel one spiral blade one, 203, mandrel one spiral blade two, 204, mandrel one spiral blade three, 205, mandrel one spiral blade four , 206, mandrel one spiral sheet five, 207, mandrel one support, 301, mandrel two, 302, mandrel two spiral sheet one, 303, mandrel two spiral sheet two, 304, mandrel two spiral sheet three, 305, mandrel two spiral sheet four, 306, mandrel two spiral sheet five, 307, mandrel two spiral sheet six, 308, mandrel two support, 401, mandrel three, 402, mandrel three spiral sheet one, 403, mandrel three spiral sheet two. Implementation

[0028] The following will be combined with the drawings in the embodiments of the present invention (taking three axes as an example) to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] Fig.10 , 11 As shown in 12, a novel spiral blade type spreading kneading self-cleaning device for a multi-axis horizontal reactor of the present invention comprises 2-4 groups of kneading stirring shaft assemblies, the kneading stirring shaft assemblies are composed of spiral blade kneading units and core shafts, there are 2-4 core shafts, which are arranged in a straight line in the horizontal direction, and the core shafts rotate in the same direction, and each core shaft has 5-20 spiral blade kneading units equidistantly inserted and fixed along the axial direction, and the arrangement method is divided into integral welding type or building block type structure.

[0030] The spiral kneading unit is composed of a support and spirals distributed around the edge of the support. The heating medium (heat transfer oil / steam / hot water) is passed through the core shaft, and the heat transfer oil / steam / hot water heating system on site is connected through the core shaft heat transfer pipe and the core shaft heat transfer pipe. Each spiral kneading unit is equipped with a heat transfer channel, which is heated by the heat transfer medium inside to improve the heat transfer efficiency of the outer surface to the contact material.

[0031] The spiral pieces are distributed around the edge of the support and are fixed to the top of the edge of the support by mechanical connection or welding. Each spiral piece kneading unit has 3-6 spiral pieces on the top of the support in the circumferential direction. The spiral pieces face the same rotation direction. These components can be installed and adjusted according to specific conditions. The support pieces on each mandrel are arranged axially along the mandrel direction. The arrangement method is divided into integral welding type or building block structure. The support pieces on two adjacent mandrels are staggered.

[0032] During operation, due to the misalignment of the spiral sheet kneading units of two adjacent mandrels, the spiral sheet of one mandrel can smoothly pass through the gap between two adjacent supporting members of the side shaft, and the spiral sheet kneading units on the two mandrels separated by one mandrel are parallel to each other.

[0033] This novel spiral blade type spreading kneading self-cleaning device can be used in a multi-axis horizontal reactor for the reaction or devolatilization of high-viscosity materials.

[0034] The screw structure has a total of 6 surfaces, including the outer curved surface of the screw, the inner curved surface of the screw, the short surface of the screw tail, the long surface of the screw tail and two screw side surfaces. When running, the sharp corner faces forward, and the junction of the short surface of the tail and the long surface of the tail is at the back.

[0035] There is an angle θ between the thrust surface of the screw blade on the kneading and stirring shaft assembly and the axis direction of the core shaft, and the angle θ ranges from 5 to 20 degrees, preferably from 10 to 15 degrees. The gap f between the outer curved surface of the screw blade and the side shaft core shaft ranges from 1≦f≦20mm, and the gap g between the side surface of the screw blade and the end surface of the support member of the side shaft ranges from 1≦g≦20mm.

[0036] Heat medium flow channels are provided inside the screw blade kneading unit and the core shaft. Heat medium passes through the flow channels to heat the kneading stirring shaft assembly, thereby increasing the heat exchange efficiency of the material in contact with the kneading stirring shaft assembly.

[0037] The relationship between the outer diameter D of the kneading stirring shaft assembly and the outer diameter d of the core shaft is: D=i×d, i is the depth ratio coefficient of the screw blade kneading stirring shaft assembly, the design value range of i is 2-2.7, the outer diameter D of the kneading stirring shaft is determined according to the value of the center distance L, and the relationship between the center distance L and the outer diameter D of the kneading stirring shaft and the outer diameter d of the core shaft is: center distance L= , kneading stirring shaft aspect ratio: l / D=4:1-8:1, lThe kneading stirring shaft length is 4:5, and the kneading stirring shaft assembly rotates in the same direction with differential speed. The speed ratios between the shafts are: double-axis differential speed ratio 4:5 (corresponding to 4 and 5 screws in each screw kneading unit of the double-axis, the same below), three-axis differential speed ratio 4:5:4, and four-axis differential speed ratio 4:5:4:5. The design range of the center distance L is 80-1100mm, and the speed range of the kneading stirring shaft assembly is 2-100rpm.

[0038] The overall structure of each screw on the kneading and stirring shaft adopts a simple harmonic wave line design. The length of each screw is determined by the lead S, which ranges from 2300 to 42000 mm. The angle θ between each screw and the axis direction ranges from 5 to 20°. The larger the lead S, the smaller the angle θ.

[0039] Fig. 9 As shown, the barrel and screw blade diameter and clearance diagram of the present invention (taking a horizontal three-shaft reactor as an example), barrel 108 and barrel jacket 109. In the figure, e represents the clearance between the inner wall Φ of the barrel and the outer diameter D of the stirring shaft.

[0040] As attached Fig.10 As shown, the core shaft includes core shaft one 201, core shaft two 301 and core shaft three 401 (taking a horizontal three-shaft reactor as an example, the same below), the three core shafts are arranged in parallel, and a number of screw-plate kneading units are equidistantly inserted and fixed on each core shaft, wherein each screw-plate kneading unit of core shaft one 201 and core shaft three 401 contains 4 screw plates, and each screw-plate kneading unit of core shaft two 301 contains 5 screw plates.

[0041] The mandrel support 207 on the mandrel 1 201 includes a mandrel spiral 1 202, a mandrel spiral 203, a mandrel spiral 3 204, and a mandrel spiral 4 205. The mandrel spiral 5 206 is on the coaxial adjacent support of the mandrel support 207, and the mandrel spiral 203 is one position backward on the paper surface in the cross section.

[0042] The mandrel three 401 includes a mandrel three spiral piece one 402 and a mandrel three spiral piece two 403 .

[0043] The mandrel two support member 308 on the mandrel two 301 includes mandrel two spiral piece one 302, mandrel two spiral piece two 303, mandrel two spiral piece three 304, mandrel two spiral piece four 305, mandrel two spiral piece five 306, and mandrel two spiral piece six 307 is on the coaxial adjacent support member of the mandrel two support member 308, and the mandrel two spiral piece two 303 is one position backward on the paper surface in the cross section.

[0044] The corresponding speed ratio of the three axes is 4:5:4. Taking core shaft 1 201 and core shaft 2 301 as an example, the spiral kneading units of the two adjacent core shafts are staggered with each other and rotate in the same direction. In this design, when operating, core shaft 1 spiral blade 2 203 and its supporting member can smoothly pass between core shaft 2 spiral blade 2 303 and core shaft 2 spiral blade 6 307 without getting stuck.

[0045] 1. Overall technical parameters of the new spiral blade type expansion kneading self-cleaning device The kneading and stirring shafts are 2-4 parallel shafts.

[0046] The outer diameter of the mandrel is d, the outer diameter of the kneading stirring shaft is D. The ratio coefficient of the stirring shaft depth is i= , the design value range of i is 2-2.7.

[0047] The center distance between two adjacent kneading and stirring shafts is L= , the design range of center distance L is 80-1100mm.

[0048] According to the above center distance formula, the outer diameter of the mandrel d = , the outer diameter range of the core shaft is 43-733.

[0049] The outer diameter D of the kneading stirring shaft = i·d, and the minimum value of the outer diameter D of the kneading stirring shaft is 2×43=86mm, and the maximum value is 2.7×733≈1979mm. The range of the outer diameter D of the kneading stirring shaft is 86-1979mm.

[0050] Aspect ratio of kneading stirring shaft l / D=4:1-8:1, l is the length of the kneading stirring shaft.

[0051] 2. Structure and self-cleaning description of the spiral mixing unit As attached Figure 1 , 2 As shown in , 3, 4 and 5, 6, 7, 8, the spiral blade mainly includes a spiral blade tip and 6 faces, namely, a spiral blade outer curved surface 103, a spiral blade inner curved surface 104, a spiral blade tail long face 105, a spiral blade tail short face 106 and two spiral blade side faces 107. The direction of the spiral blade tip 102 is the same as the rotation direction, and it is fixed to the support member by mechanical connection or welding. Fig.11 As shown in the figure, the overall structure of each screw on the screw kneading and stirring shaft adopts a design similar to the spiral lead form. Due to the meshing with the adjacent screw of the side shaft for self-cleaning, it is disconnected to form a discontinuous single screw structure. During the rotation process, it can generate axial thrust, which can continuously and stably push the material along the axis. The length of each screw is determined by the lead S (that is, the wave line period, the distance that a point on the screw moves along the axis when it rotates one circle along the wave line and the axis), and the lead S range is 2300-42000mm. As shown in the attached Fig.11 As shown, taking the mandrel 3 401 as an example, the angle θ between each spiral blade and the axial direction ranges from 5 to 20 degrees, and the larger the lead length S, the smaller the angle θ. In actual production, the angle θ is determined according to the required material residence time, and the larger the angle θ, the shorter the residence time.

[0052] For ultra-high viscosity materials and agglomerated materials, the spiral mixing unit adopts a three-dimensional structure design with sharp corners and multiple curved surfaces. The three-dimensional design of sharp corners and curved surfaces is conducive to the mixing unit inserting and cutting ultra-high viscosity materials or agglomerated materials, reducing the resistance of the materials to the mixing unit.

[0053] 3. The self-cleaning and spreading and kneading functions of the new spiral blade spreading and kneading self-cleaning device: The expansion, kneading and self-cleaning functions of the screw mixing unit are mainly formed at the meshing point with the adjacent screws. The multi-curved surface profile of the screw and the differential speed design of the mandrel can make the screws (including between the screw tip and the short surface of the tail, between the inner curved surface and the long surface of the tail), between the screw tip and the adjacent mandrel, between the screw side and the adjacent support, and between the screw outer curved surface and the inner wall of the barrel scrape each other, forming "self-cleaning" on the surface of the screw, the surface of the support, the surface of the shaft, and the inner wall of the barrel.

[0054] The screw blades rotate in the same direction at a differential speed. The screw blade tip angle 102 and the screw blade outer curved surface 103 of two adjacent screw blades on different axes at the screw blade meshing position rotate in opposite directions. The matching rotation speed is the addition of the differential rotation, which has excellent stretching and film-forming effects on the material. At the same time, when the outer curved surface 103 of the mixing screw blade is meshed with the adjacent surface of the mandrel 201, and the screw blade inner curved surface 104, the screw blade tail long surface 105, and the screw blade tail short surface 106 are in the process of meshing with the adjacent screw blades, the screw blade shears and mixes the material between the screw blades. The above process is a process of "expanding and kneading" the material, which can improve the mass transfer, heat transfer and interface renewal capabilities of the screw blade device to the material, thereby improving the reaction or devolatilization efficiency.

[0055] The meshing is described as follows: As attached Fig.10 As shown, the axial spacing g between the second spiral blade 303 of the second mandrel and the first support member 207 of the first mandrel, as well as between the third spiral blade 402 of the second mandrel and the second support member 308 of the second mandrel is very small. Taking the second spiral blade 303 of the second mandrel and the first support member 207 of the first mandrel as an example, during operation, the side surface of the second spiral blade 303 of the second mandrel can sweep up the residual material on the first support member 207 of the first mandrel, and the first support member 207 can also sweep up the residual material on the side surface of the second spiral blade 303 of the second mandrel, thereby realizing self-cleaning of the spiral blades and the support members.

[0056] As attached Fig.12 As shown in the figure, during the rotation of the mandrel, when it rotates to position 1, it can be found that due to the existence of the angle θ between the spiral blade and the axis direction of the mandrel, the spiral blade is rotated to position 1. Fig.12Cross-sectional observation shows that there are not only three screw kneading units. The screw and support member facing inwards will always be a little ahead of the screw and support member facing outwards in the rotation direction. For example, screw member five 206 on mandrel one 201 and screw member six 307 on mandrel two 301 have almost completed the meshing process, while screw member two 203 on mandrel one 203 and screw member two 303 on mandrel two 301 which are facing outwards from the paper are in the process of meshing.

[0057] Specific observation shows that the mandrel one spiral blade 202 and the mandrel one spiral blade 203 on the mandrel one 201 are meshed with the mandrel two spiral blade 1 302 and the mandrel two spiral blade 2 303 on the mandrel two 301 respectively, and the meshing areas are different, wherein the sharp corner of the mandrel one spiral blade 202 is meshed with the short tail surface of the mandrel two spiral blade 1 302, thereby scraping the surface materials of the two parts; the inner curved surface of the mandrel one spiral blade 203 is meshed with the long tail surface of the mandrel two spiral blade 2 303, and the meshing surface is the same as the meshing surface of the mandrel one spiral blade 203 and the mandrel two spiral blade 2 303, thereby realizing the self-cleaning function between the spiral blades; the mandrel two spiral blade 2 303 and the mandrel three spiral blade 1 402 The outer curved surface and the sharp corner can scrape the surface of spindle one screw blade 201 and spindle two 301 respectively, so as to realize self-cleaning between the screw blade and the spindle; in addition, spindle one screw blade 202, spindle one screw blade 203, spindle one screw blade 3 204 and spindle one screw blade 4 205 and the rear part of the screw blade on spindle one 201, spindle two screw blade 1 302, spindle two screw blade 3 304, spindle two screw blade 4 305 and spindle two screw blade 5 306 and the rear part of the screw blade on spindle two 301, and the remaining three groups of partial screw blades except spindle three screw blade 1 402 and the rear part of the screw blade on spindle three 401, these screw blades' outer curved surfaces or sharp corners are scraping the inner wall of the barrel, so as to realize self-cleaning between the screw blade and the inner wall of the barrel.

[0058] The advantages of the novel spiral-flap type spreading and kneading self-cleaning device for a multi-axis horizontal reactor of the present invention are as follows: 1. All-round and efficient self-cleaning: When the new screw-type spreading and kneading self-cleaning device is in operation, the outer curved surface of each screw on the device can be self-cleaned with the side shaft, and the two side surfaces can be self-cleaned with the two supporting members adjacent to the side shaft respectively. The screws adjacent to the side shaft can also clean each surface of the screw except the two side surfaces of the screw. Therefore, the new screw-type spreading and kneading self-cleaning device can achieve the maximum self-cleaning area that can be achieved in the current self-cleaning kneading device, and avoid dead zone accumulation to the maximum extent, and avoid problems such as thermal decomposition and uneven product polymerization degree caused by long-term residence of materials.

[0059] 2. Excellent mass transfer effect: In the direction of operation, the unique screw structure of the new screw-type spreading kneading self-cleaning device has a sharp corner on the front side, and the outer curved surface is curved on one side. The sharp corner is easier to penetrate and drive the transfer of high-viscosity and high-melt strength materials during operation, and the materials can be efficiently mixed and cut. It is suitable for materials with a viscosity higher than 300Pa·s and solid materials, and can achieve high filling. In addition, compared with other structural claws at the same speed, the screw exerts greater pressure on high-viscosity or high-melt strength materials, has better film-drawing properties, and can fully expose and release the volatiles contained in the material during the devolatilization operation.

[0060] 3. Sufficient heat transfer effect: The core shaft of the new screw-type spreading kneading self-cleaning device and the screw-type kneading unit are equipped with heat medium flow channels, which can be heated by heat medium and provide heat for the material in all directions. The heat transfer area is large, and the heat transfer is more uniform and efficient.

[0061] 4. Smooth operation process: In the running direction, the unique screw structure of the new screw-type spreading kneading self-cleaning device has sharp corners and smooth outer curved surfaces. When rotating, the sharp corners can more easily penetrate into high-viscosity and high-melt strength materials, reducing running resistance, and reducing the resistance of high-viscosity materials to the screw and the load of the main motor.

[0062] 5. Continuous production: The screw blades on the mandrel of the new screw blade type spreading kneading self-cleaning device have an angle between their thrust surface and the axial direction, which can generate axial thrust during rotation and can continuously and stably push the material along the axial direction. Therefore, the new screw blade type spreading kneading self-cleaning device can work continuously and stably for a long time.

[0063] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A novel spiral blade type spreading kneading self-cleaning device for a multi-axis horizontal reactor, characterized in that: The invention comprises 2-4 groups of kneading and stirring shaft assemblies, wherein the kneading and stirring shaft assemblies are composed of spiral slice kneading units and mandrels. There are 2-4 mandrels which are arranged in a straight line in the horizontal direction and rotate in the same direction. Each mandrel is sleeved and fixed with 5-20 spiral slice kneading units at equal intervals along the axial direction. The spiral slice kneading units are composed of a support member and spiral slices distributed circumferentially at the edge of the support member. The spiral slices mainly include spiral slice sharp corners and 6 surfaces, namely, a spiral slice outer curved surface (103), a spiral slice inner curved surface (104), a spiral slice tail long surface (105), a spiral slice tail short surface (106) and two spiral slice side surfaces (107). The direction facing the spiral slice sharp corner (102) is the same as the rotation direction. When the spiral slice sharp corner is in operation, the spiral slice sharp corner faces forward, and the junction point of the spiral slice tail short surface and the spiral slice tail long surface is at the rear.

2. A novel spiral blade type spreading kneading self-cleaning device for a multi-axis horizontal reactor according to claim 1, characterized in that: The spiral slices are distributed on the circumference of the edge of the support and are fixed to the top of the edge of the support by mechanical connection or welding. Each spiral slice kneading unit has 3-6 spiral slices in the circumferential direction of the edge of the support, and the sharp corners of the spiral slices face the same rotation direction. The support members on each core shaft are arranged axially along the core shaft direction, and the support members on two adjacent core shafts are staggered with each other.

3. A novel spiral blade type spreading kneading self-cleaning device for a multi-axis horizontal reactor according to claim 1, characterized in that: There is an angle θ between the thrust surface of the screw blade on the kneading and stirring shaft assembly and the axis direction of the core shaft, the angle θ ranges from 5 to 20 degrees, the gap f between the outer curved surface of the screw blade and the core of the side shaft ranges from 1≦f≦20mm, and the gap g between the side surface of the screw blade and the end surface of the support member of the side shaft ranges from 1≦g≦20mm.

4. A novel spiral blade type spreading kneading self-cleaning device for a multi-axis horizontal reactor according to claim 1, characterized in that: The spiral slice kneading unit and the core shaft are both provided with heat medium flow channels, and the heat medium flows through the flow channels to heat the kneading and stirring shaft assembly.

5. A novel spiral blade type spreading kneading self-cleaning device for a multi-axis horizontal reactor according to claim 1, characterized in that: The relationship between the outer diameter D of the kneading stirring shaft assembly and the outer diameter d of the core shaft is: D=i×d, i is the depth ratio coefficient of the screw blade kneading stirring shaft assembly, the design value range of i is 2-2.7, the outer diameter D of the kneading stirring shaft is determined according to the value of the center distance L, and the relationship between the center distance L and the outer diameter D of the kneading stirring shaft and the outer diameter d of the core shaft is: center distance L= , kneading stirring shaft aspect ratio: l / D=4:1-8:1, l The kneading stirring shaft length is selected. The kneading stirring shaft assembly rotates in the same direction with differential speed. The speed ratios between the shafts are: double-axis differential speed ratio 4:5, three-axis differential speed ratio 4:5:4, four-axis differential speed ratio 4:5:4:

5. The design range of the center distance L is 80-1100mm, and the speed range of the kneading stirring shaft assembly is 2-100rpm.

6. A novel spiral blade type spreading kneading self-cleaning device for a multi-axis horizontal reactor according to claim 1, characterized in that: The length of each screw blade is determined by the lead S, which ranges from 2300 to 42000 mm. The angle θ between each screw blade and the axial direction is 5 to 20°. The larger the lead S is, the smaller the angle θ is.

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