Variable gap synchronous meshing triangular rotor for an internal mixer
By using a variable-gap synchronous meshing triangular rotor, the problems of high energy consumption and poor dispersion effect in the mixing of high-viscosity polymers by traditional internal mixers are solved, achieving efficient material mixing and dispersion and reducing energy consumption.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- NANHUA UNIV
- Filing Date
- 2026-02-13
- Publication Date
- 2026-05-12
AI Technical Summary
Traditional internal mixers suffer from high energy consumption, rapid temperature rise, and poor dispersion and mixing effects when mixing high-viscosity polymers and dispersing fillers.
The variable gap synchronous meshing triangular rotor is adopted. Through the synchronous meshing of the front and rear rotors, the material is subjected to periodic extrusion and tensile stress between the rotors. Combined with the clockwise-counterclockwise spiral structure, the material is promoted to reciprocate between the rotors.
It improves the mixing and dispersion effect of high-viscosity materials, reduces mixing energy consumption, and enhances the mixing and dispersion efficiency and uniformity of materials.
Smart Images
Figure CN121697121B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of internal mixer technology, and more specifically, to a variable gap synchronous meshing triangular rotor for an internal mixer. Background Technology
[0002] Internal mixers are crucial equipment for mixing polymer materials. Within a closed chamber under specific temperature and pressure, a pair of rotors of a specific shape rotate at a certain speed ratio to plasticize and mix polymer materials and their composite systems. An internal mixer mainly consists of a mixing chamber, a pair of rotors, a pressing device, a heating and cooling device, a transmission device, and a base. During operation, materials enter the mixing chamber through a hopper, filling the gap between the two relatively rotating rotors and the gap between the rotors and the inner wall of the mixing chamber. Under the continuous changing shearing, kneading, and friction, the materials are heated, melted, plasticized, and uniformly mixed. Traditional internal mixer rotors include Roller, Banbury, Cam, and Sigma. Roller rotors are suitable for mixing thermoplastic and thermosetting polymers and can also be used to test material viscosity, crosslinking reactions, and shear stress, making them particularly widely used in polymer mixing.
[0003] When polymer materials are mixed, the melt is always subjected to the combined action of normal stress and shear stress. Traditionally, the mixing technology of internal mixers has been mainly based on shear stress and supplemented by normal stress. It has significant advantages in some aspects, such as high shear stress, which is conducive to the refinement and dispersion of materials. However, friction drag shearing has high energy consumption, and high shear stress can also easily lead to excessive temperature rise. In particular, it has low mixing efficiency for some high viscosity polymers and poor dispersion and mixing effect of fillers.
[0004] In normal stress-dominated compounding technology, the material undergoes extrusion deformation by compressing its volume, followed by tensile deformation as the compressed volume is released. Whether extrusion or tensile, the deformation direction is parallel to the velocity gradient direction; therefore, the material is primarily subjected to normal stress, including extrusion and tensile stress. Studies have shown that normal stress-dominated melt plasticizing technology has significant advantages for processing high-viscosity polymers and dispersing fillers. Summary of the Invention
[0005] The purpose of this invention is to provide a variable-gap synchronous meshing triangular rotor for an internal mixer to overcome the shortcomings in the aforementioned background technology.
[0006] To achieve the above objectives, the present invention adopts the following technical solution: a variable-gap synchronous meshing triangular rotor for an internal mixer, comprising a front rotor and a rear rotor, wherein the front rotor comprises a front rotor shaft and a front rotor body, and the rear rotor comprises a rear rotor shaft and a rear rotor body, wherein any cross-section of the front rotor body and the rear rotor body is a Reuleaux triangle of equal dimensions, and the diameter of the circumcircle of the Reuleaux triangle is [missing information]. D ;
[0007] The front rotor body includes a first helical segment and a second helical segment. The first helical segment rotates clockwise, and the second helical segment rotates counterclockwise. The phase at the beginning of the second helical segment is the same as the phase at the end of the first helical segment, and the phase at the end of the second helical segment is the same as the phase at the beginning of the first helical segment.
[0008] The rear rotor body includes a first helical segment and a second helical segment. The first helical segment rotates counterclockwise, and the second helical segment rotates clockwise. The phase at the beginning of the second helical segment is the same as the phase at the end of the first helical segment, and the phase at the end of the second helical segment is the same as the phase at the beginning of the first helical segment.
[0009] The rotation center shaft of the front rotor l 1 represents the axis of the front rotor shaft, and the axis of rotation of the rear rotor is... l 2 is the axis of the rear rotor shaft.
[0010] Furthermore, the axial length of the front rotor body is H The axial length of the first helical segment of the front rotor body is h 1. The pitch of the helix is S 1. The number of spiral turns is N 1. The axial length of the second helical segment of the front rotor body is h 2. The pitch of the helix is S 2. The number of spiral turns is N 2; The axial length of the rear rotor body is also... H The axial length of the first helical segment of the rear rotor body is h 1. The pitch of the helix is S 1. The number of spiral turns is N 1. The axial length of the second helical segment of the rear rotor body is h 2. The pitch of the helix is S 2. The number of spiral turns is N 2.
[0011] Preferably, the Reuleaux triangle vertices of the front rotor body and the rear rotor body are rounded.
[0012] Furthermore, in the front rotor body and the rear rotor body, H = h 1+ h 2. h 1 = (0.3~0.7) H , h 2 = (0.3~0.7) H , N 1= N 2 = 0.1~0.3 S 1: S 2= h 1: h 2.
[0013] Preferably, h 1= h 2 = 0.5H, N 1= N 2 = 1 / 6.
[0014] Furthermore, when the front rotor body and the rear rotor body are meshed and assembled, the rotation center axis of the front rotor... l 1 and the rotation center shaft of the rear rotor l The spacing of 2 is The first helical segment of the front rotor body corresponds to the first helical segment of the rear rotor body, and the second helical segment of the front rotor body corresponds to the second helical segment of the rear rotor body. The phase difference between the front rotor and the rear rotor is 30°.
[0015] Furthermore, when the front rotor and the rear rotor rotate synchronously in opposite directions, there are always several meshing points between the front rotor body and the rear rotor body. There is a meshing point between the first helical segment of the front rotor body and the first helical segment of the rear rotor body, and there is a meshing point between the second helical segment of the front rotor body and the second helical segment of the rear rotor body.
[0016] Furthermore, the meshing point of the front rotor body and the rear rotor body is divided into meshing mode one and meshing mode two. Meshing mode one refers to the contact between the vertex of the Reuleaux triangle of the front rotor body and the arc side of the Reuleaux triangle of the rear rotor body. Meshing mode two refers to the contact between the arc side of the Reuleaux triangle of the front rotor body and the vertex of the Reuleaux triangle of the rear rotor body.
[0017] Furthermore, the meshing point of the front rotor body and the rear rotor body exhibits a cyclical change of approaching-merging-separating-approaching, and the rotor clearance of the front rotor body and the rear rotor body exhibits a cyclical change of large-small-large.
[0018] The periodic change in the gap of the synchronously meshing triangular rotor subjectes the material to periodic compressive and tensile stresses. Compared with the prior art, the present invention has the following advantages and beneficial effects:
[0019] 1. This invention utilizes the periodic change in the gap of synchronously meshing triangular rotors to enhance the normal stress effect in the mixing process, improve the mixing and dispersion effect of materials, and reduce the energy consumption of the mixing process.
[0020] 2. This invention utilizes the clockwise-counterclockwise spiral combination structure of a triangular rotor to achieve the reciprocating flow of materials between the first and second spiral sections during the mixing process, thereby improving the axial mixing and dispersion effect of the materials.
[0021] 3. This invention utilizes the vertex-arc edge meshing form of the triangular rotor and the change in rotor gap to achieve the reciprocating flow of materials between the front rotor body and the rear rotor body during the mixing process, thereby improving the mixing and dispersion effect of materials along the circumferential direction.
[0022] 4. The mixing technology achieved by the variable gap synchronous meshing triangular rotor of this invention is beneficial for processing high viscosity materials and efficiently mixing and dispersing fillers. Attached Figure Description
[0023] Figure 1 This is a schematic diagram of the overall structure of the variable gap synchronous meshing triangular rotor of the internal mixer.
[0024] Figure 2 yes Figure 1 A schematic diagram of the triangular rotor shape.
[0025] Figure 3 yes Figure 1 A schematic diagram of the front rotor structure.
[0026] Figure 4 yes Figure 1 A schematic diagram of the rear rotor structure.
[0027] Figure 5 This is a schematic diagram showing the positional relationship between the front and rear rotors at different axial positions.
[0028] Figure 6 This is a schematic diagram showing the positional relationship between the front and rear rotors at the beginning of the first helical segment when the rotors rotate synchronously in opposite directions.
[0029] Figure 7 This is a schematic diagram showing the changes in the meshing point and rotor clearance between the front and rear rotor bodies when the rotors rotate synchronously in opposite directions.
[0030] Wherein, 1 is the front rotor shaft, 2 is the front rotor body, 21 is the first helical segment of the front rotor body, 22 is the second helical segment of the front rotor body, 3 is the rear rotor shaft, 4 is the rear rotor body, 41 is the first helical segment of the rear rotor body, and 42 is the second helical segment of the rear rotor body. xLet be the axial distance between a certain cross section of the front rotor body and the beginning of the first helical segment of the front rotor body; let 'a' be one of the meshing points of the first helical segment of the front rotor body and the first helical segment of the rear rotor body; let 'b' be another meshing point of the first helical segment of the front rotor body and the first helical segment of the rear rotor body; let 'c' be one of the meshing points of the second helical segment of the front rotor body and the second helical segment of the rear rotor body; and let 'd' be another meshing point of the second helical segment of the front rotor body and the second helical segment of the rear rotor body. Detailed Implementation
[0031] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the following text is only used to describe specific implementations of the present invention and does not strictly limit the scope of protection specifically claimed by the present invention.
[0032] This invention provides a variable-gap synchronous meshing triangular rotor for an internal mixer, comprising a front rotor and a rear rotor, such as... Figure 1 As shown, the front rotor includes a front rotor shaft 1 and a front rotor body 2, and the rear rotor includes a rear rotor shaft 3 and a rear rotor body 4. Any cross-section of the front rotor body 2 and the rear rotor body 4 is a Reuleaux triangle of equal dimensions, as shown below. Figure 2 As shown, the diameter of the circumcircle of the Reuleaux triangle is D The front rotor body 2 includes a first helical segment 21 and a second helical segment 22. The first helical segment 21 rotates clockwise, and the second helical segment 22 rotates counterclockwise. The phase of the beginning of the second helical segment 22 is the same as the phase of the end of the first helical segment 21, and the phase of the end of the second helical segment 22 is the same as the phase of the beginning of the first helical segment 21. The rear rotor body 4 includes a first helical segment 41 and a second helical segment 42. The first helical segment 41 rotates counterclockwise, and the second helical segment 42 rotates clockwise. The phase of the beginning of the second helical segment 42 is the same as the phase of the end of the first helical segment 41, and the phase of the end of the second helical segment 42 is the same as the phase of the beginning of the first helical segment 41. The rotation center axis of the front rotor... l 1 represents the axis of the front rotor shaft 1, and the rotation center axis of the rear rotor. l 2 is the axis of the rear rotor shaft 3.
[0033] like Figure 3 As shown, the axial length of the front rotor body 2 is H The axial length of the first helical segment 21 of the front rotor body is h 1. The pitch of the helix is S 1. The number of spiral turns is N 1. The axial length of the second helical segment 22 of the front rotor body is h 2. The pitch of the helix is S2. The number of spiral turns is N 2; such as Figure 4 As shown, the axial length of the rear rotor body 4 is also... H The axial length of the first helical segment 41 of the rear rotor body is h 1. The pitch of the helix is S 1. The number of spiral turns is N 1. The axial length of the second helical segment 42 of the rear rotor body is h 2. The pitch of the helix is S 2. The number of spiral turns is N 2. Rounding the vertices of the Reuleaux triangles of the front rotor body 2 and the rear rotor body 4.
[0034] In this embodiment, H = h 1+ h 2. h 1= h 2 = 0.5 H , N 1= N 2 = 1 / 6 S 1: S 2= h 1: h 2.
[0035] like Figure 5 As shown, when the front rotor body 2 and the rear rotor body 4 are meshed and assembled, the rotation center axis of the front rotor... l 1 and the rotation center axis of the rear rotor l The spacing of 2 is The first helical segment 21 of the front rotor body corresponds to the first helical segment 41 of the rear rotor body, and the second helical segment 22 of the front rotor body corresponds to the second helical segment 42 of the rear rotor body. The phase difference between the front rotor and the rear rotor is 30°. The front rotor body 2 and the rear rotor body 4 are meshed at both ends and separated in the middle, forming a closed large gap. Specifically, the positional relationship between the front rotor body 2 and the rear rotor body 4 is as follows:
[0036] S1: In x =0, that is, at the beginning of the first helical segment 21 of the front rotor body, the meshing form of the front rotor body 2 and the rear rotor body 4 is meshing mode one.
[0037] S2: In x =0.5 h At point 1, the meshing form of the front rotor body 2 and the rear rotor body 4 is meshing mode two;
[0038] S3: In x = h At point 1, the front rotor body 2 and the rear rotor body 4 do not contact each other, that is, there is no meshing point;
[0039] S4: In x = h 1+0.5 h At point 2, the meshing form between the front rotor body 2 and the rear rotor body 4 is meshing mode two;
[0040] S5: In x = h 1+ h At point 2, that is, at the end of the second helical segment 22 of the front rotor body, the meshing form of the front rotor body 2 and the rear rotor body 4 is meshing mode one.
[0041] like Figure 6 As shown, during the synchronous 360° rotation of the front and rear rotors towards each other, the front rotor body 2 and the rear rotor body 4 engage six times, including three engagement modes one and three engagement modes two. The three vertices of the front rotor body 2 participate in one engagement mode one, and the three arc edges participate in one engagement mode two. The three vertices of the rear rotor body 4 participate in one engagement mode two, and the three arc edges participate in one engagement mode one. The engagement of the front rotor body 2 and the rear rotor body 4 presents a cyclical change of engagement mode one - engagement mode two - no engagement. The front and rear rotors can complete one cycle by rotating synchronously 120° towards each other.
[0042] like Figure 7 As shown, when the front rotor and the rear rotor rotate synchronously in opposite directions, there are always several meshing points between the front rotor body 2 and the rear rotor body 4. There is at least one meshing point between the first helical segment 21 of the front rotor body and the first helical segment 41 of the rear rotor body, and at least one meshing point between the second helical segment 22 of the front rotor body and the second helical segment 42 of the rear rotor body. The rotor clearance also exhibits periodic changes, as detailed below:
[0043] S1: Rotating 0° towards each other, the first helical segment 21 of the front rotor body and the first helical segment 41 of the rear rotor body have two meshing points a and b. Meshing point a, which belongs to meshing mode one, is located at... x At point =0, the engagement point b, belonging to engagement mode two, is located... x =0.5 h At point 1; the second helical section 22 of the front rotor body and the second helical section 42 of the rear rotor body also have two meshing points c and d, and the meshing point c, which belongs to meshing mode two, is located at x = h 1+0.5 h At two locations, the meshing point d, belonging to meshing mode one, is located... x = h 1+ h There are 2 locations; a certain amount of rotor clearance exists.
[0044] S2: Rotate 30° in opposite directions, and the engagement point a shifts to... x =0.5h At point 1, the meshing point d shifts to... x = h 1+0.5 h There are 2 points, while the engagement point b and engagement point c merge at... x = h At point 1; the rotor clearance is almost zero;
[0045] S3: Rotate 60° in opposite directions, and engagement points a, b, c, and d simultaneously merge at... x = h At point 1, the meshing mode is meshing type one, and the rotor clearance becomes zero;
[0046] S4: Rotate 90° towards each other, engagement points a and d disappear, and engagement point b shifts to... x At point = 0, the engagement point c shifts to... x = h 1+ h At two locations, the rotor clearance reaches its maximum.
[0047] S5: Rotate 120° towards each other, and the meshing point a reappears. x At point = 0, the engagement point d reappears. x = h 1+ h 2 locations; meshing point b transferred to x =0.5 h At point 1, the engagement point c shifts to... x = h 1+0.5 h At point 2; the rotor clearance is reduced compared to when they rotate 90° in opposite directions; the front rotor body 2 and the rear rotor body 4 have returned to the meshing state when they rotate 0° in opposite directions.
[0048] When the front rotor and the rear rotor rotate synchronously in opposite directions, the meshing point of the front rotor body 2 and the rear rotor body 4 exhibits a cyclical change of approaching-merging-separating-approaching, and the rotor clearance between the front rotor body 2 and the rear rotor body 4 exhibits a cyclical change of large-small-large.
[0049] The periodic changes in the gap of the synchronous meshing triangular rotor subject the material to periodic compressive and tensile stresses, enhancing the normal stress effect in the mixing process, improving the mixing and dispersion effect of the material along the axial and circumferential directions, reducing the energy consumption of the mixing process, and facilitating the mixing of high-viscosity materials and improving the dispersion efficiency and uniformity of fillers.
[0050] The above description is merely an exemplary embodiment of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention. Structures, devices, and operating methods not specifically described or explained in this invention are implemented according to conventional methods in the art unless otherwise specified or limited.
Claims
1. A variable-gap synchronous meshing triangular rotor for an internal mixer, characterized in that, The rotor includes a front rotor and a rear rotor. The front rotor includes a front rotor shaft and a front rotor body. The rear rotor includes a rear rotor shaft and a rear rotor body. Either cross-section of the front rotor body or the rear rotor body is a Reuleaux triangle of equal size, and the diameter of the circumcircle of the Reuleaux triangle is [missing information]. D The front rotor body includes a first helical segment and a second helical segment. The first helical segment rotates clockwise, and the second helical segment rotates counterclockwise. The phase of the beginning of the second helical segment is the same as the phase of the end of the first helical segment, and the phase of the end of the second helical segment is the same as the phase of the beginning of the first helical segment. The rear rotor body includes a first helical segment and a second helical segment. The first helical segment rotates counterclockwise, and the second helical segment rotates clockwise. The phase of the beginning of the second helical segment is the same as the phase of the end of the first helical segment, and the phase of the end of the second helical segment is the same as the phase of the beginning of the first helical segment. The rotation center axis of the front rotor... l 1 represents the axis of the front rotor shaft, and the axis of rotation of the rear rotor is... l 2 represents the axis of the rear rotor shaft; the axial length of the front rotor body is... H The axial length of the first helical segment of the front rotor body is h 1. The pitch of the helix is S 1. The number of spiral turns is N 1. The axial length of the second helical segment of the front rotor body is h 2. The pitch of the helix is S 2. The number of spiral turns is N 2; The axial length of the rear rotor body is also... H The axial length of the first helical segment of the rear rotor body is h 1. The pitch of the helix is S 1. The number of spiral turns is N 1. The axial length of the second helical segment of the rear rotor body is h 2. The pitch of the helix is S 2. The number of spiral turns is N 2; In the front rotor body and the rear rotor body, H = h 1+ h 2. h 1 = (0.3~0.7) H , h 2 = (0.3~0.7) H , N 1= N 2 = 0.1~0.3 S 1: S 2= h 1: h 2。 2. The variable-gap synchronous meshing triangular rotor of an internal mixer according to claim 1, characterized in that, When the front rotor body and the rear rotor body are meshed and assembled, the rotation center axis of the front rotor... l 1 and the rotation center shaft of the rear rotor l The spacing of 2 is L = 1 2 + 3 sin 30 ° - a r c sin 1 2 3 D The first helical segment of the front rotor body corresponds to the first helical segment of the rear rotor body, and the second helical segment of the front rotor body corresponds to the second helical segment of the rear rotor body. The phase difference between the front rotor and the rear rotor is 30°.
3. The variable-gap synchronous meshing triangular rotor of a mixer according to claim 2, characterized in that, When the front rotor and the rear rotor rotate synchronously in opposite directions, there are always several meshing points between the front rotor body and the rear rotor body. There is a meshing point between the first helical segment of the front rotor body and the first helical segment of the rear rotor body, and there is a meshing point between the second helical segment of the front rotor body and the second helical segment of the rear rotor body.
4. The variable-gap synchronous meshing triangular rotor of an internal mixer according to claim 3, characterized in that, The meshing point of the front rotor body and the rear rotor body is divided into meshing mode one and meshing mode two. Meshing mode one refers to the contact between the vertex of the Reuleaux triangle of the front rotor body and the arc side of the Reuleaux triangle of the rear rotor body. Meshing mode two refers to the contact between the arc side of the Reuleaux triangle of the front rotor body and the vertex of the Reuleaux triangle of the rear rotor body.
5. The variable-gap synchronous meshing triangular rotor of a mixer according to claim 3, characterized in that, The meshing point of the front rotor body and the rear rotor body exhibits a cyclical change of approaching-merging-separating-approaching, and the rotor clearance between the front rotor body and the rear rotor body exhibits a cyclical change of large-small-large.