Nine-flighted intermeshing rotor elements for extruders and twin-screw extruders

Abstract

This invention discloses an extruder and its nine-sided meshing rotor element for a twin-screw extruder, relating to the field of extruder technology. The nine-sided meshing rotor element for the twin-screw extruder includes: a right rotor element, comprising three right-handed long ridges evenly distributed along the middle of the right rotor element, three front left-handed short ridges evenly distributed along the front end of the right rotor element, and three rear left-handed short ridges evenly distributed along the rear end of the right rotor element. Each right-handed long ridge rotates to the right by a first angle relative to the central axis of the right rotor element, each front left-handed short ridge rotates to the left by a second angle relative to the central axis of the right rotor element, and each rear left-handed short ridge rotates to the left by a second angle relative to the central axis of the right rotor element. The right-handed long ridges, front left-handed short ridges, and rear left-handed short ridges are all provided with guide grooves; and a left rotor element, which is mirror-image of the right rotor element. This device can improve the material mixing effect of a parallel counter-rotating twin-screw extruder.

Description

Technical Field

[0001] This invention relates to the field of extruder technology, and more specifically, to a nine-sided meshing rotor element for a twin-screw extruder. Furthermore, it relates to an extruder comprising the aforementioned nine-sided meshing rotor element for a twin-screw extruder. Background Technology

[0002] In related technologies, in the traditional rubber processing field, parallel counter-rotating twin-screw extruders mostly employ symmetrically distributed twin-headed screw elements or meshing block elements to respectively convey and shear materials, achieving relatively clear functions in a single structure. Furthermore, the symmetrically distributed twin-headed screw elements facilitate replacement of parts, achieving structural standardization. However, due to the single-function nature of the single structure, when there are complex material mixing requirements, multiple screw elements need to be connected in series to achieve complex functions. This leads to redundancy in the overall structure of the device, and as the number of screw elements increases, the length of the entire screw continuously increases, making screw wear due to bending deformation increasingly significant.

[0003] In summary, improving the material mixing effect of parallel counter-rotating twin-screw extruders and simplifying the screw structure are problems that urgently need to be solved by those skilled in the art. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a nine-sided meshing rotor element for a twin-screw extruder, which can effectively improve the material mixing effect of a parallel counter-rotating twin-screw extruder and simplify the screw structure.

[0005] Another object of the present invention is to provide an extruder comprising the nine-sided meshing rotor element of the above-described twin-screw extruder.

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

[0007] A nine-sided meshing rotor element for a twin-screw extruder includes:

[0008] The right rotor element includes three right-handed long edges evenly distributed along the outer periphery of the middle end of the right rotor element, three front left-handed short edges evenly distributed along the outer periphery of the front end of the right rotor element, and three rear left-handed short edges evenly distributed along the outer periphery of the rear end of the right rotor element. Each right-handed long edge is rotated to the right by a first angle relative to the central axis of the right rotor element, each front left-handed short edge is rotated to the left by a second angle relative to the central axis of the right rotor element, and each rear left-handed short edge is rotated to the left by a second angle relative to the central axis of the right rotor element. Each right-handed long edge, each front left-handed short edge, and each rear left-handed short edge is provided with a guide groove.

[0009] The left rotor element is mirror-image of the right rotor element;

[0010] The mandrel is provided in the central shaft hole of both the right rotor element and the left rotor element to drive the right rotor element and the left rotor element to mesh and rotate in opposite directions.

[0011] Preferably, the front left-handed short ridge and the rear left-handed short ridge have the same length and the same number of guide grooves;

[0012] The length ratio of the right-handed long edge to the front left-handed short edge is n, and the ratio of the number of guide grooves on the right-handed long edge to the number of guide grooves on the front left-handed short edge is n.

[0013] Preferably, the bottom width of the right-hand long edge, the front left-hand short edge, and the rear left-hand short edge is less than or equal to 1 / 12 of the circumference of the bottom circle of the right rotor element edge;

[0014] The width of the top of each of the right-hand long edge, the front left-hand short edge, and the rear left-hand short edge is less than or equal to 1 / 30 of the circumference of the top circle of the right rotor element.

[0015] Preferably, the cross-sections of the guide grooves on the right-hand long edge, the front left-hand short edge, and the rear left-hand short edge are all isosceles trapezoids, and the depth of the guide groove is 1 / 3 to 1 / 2 of the height of the corresponding edge.

[0016] Preferably, a plurality of first right-side guide grooves are provided at equal intervals on the right-handed long edge, and the distance between two adjacent first right-side guide grooves is greater than or equal to the widest distance of the cross-section of the first right-side guide grooves.

[0017] The distance from both ends of the first right-side guide channel to the two end faces of the right-hand spiral elongated edge is greater than or equal to the widest spacing of the cross-section of the first right-side guide channel.

[0018] Preferably, a second right-side guide groove is provided in the middle of the rear left-handed short ridge, the opening length of the second right-side guide groove is twice the opening length of the first right-side guide groove, and the distances from both ends of the second right-side guide groove to both ends of the rear left-handed short ridge are equal.

[0019] A third right-side guide groove is provided in the middle of the front left-hand short ridge. The opening length of the third right-side guide groove is twice the opening length of the first right-side guide groove, and the distances from both ends of the third right-side guide groove to both ends of the front left-hand short ridge are equal.

[0020] Preferably, the bottom of the first right-side guide channel, the second right-side guide channel, and the third right-side guide channel are all provided with rounded corners.

[0021] Preferably, the right rotor element and the mandrel, and the left rotor element and the mandrel are all connected by involute splines.

[0022] Preferably, the first angle is 60° and the second angle is 36°.

[0023] An extruder comprising the nine-sided meshing rotor element of the twin-screw extruder described in any of the preceding claims.

[0024] When using the nine-sided meshing rotor element of the twin-screw extruder provided by this invention, since the left rotor element and the right rotor element are mirror-distributed, that is, the left rotor element includes three left-handed long edges evenly distributed along the outer periphery of the middle end of the left rotor element, three front right-handed short edges evenly distributed along the outer periphery of the front end of the left rotor element, and three rear right-handed short edges evenly distributed along the outer periphery of the rear end of the left screw. Each left-handed long edge rotates leftward by a first angle relative to the central axis of the left rotor element, each front right-handed short edge rotates rightward by a second angle relative to the central axis of the left rotor element, and each rear right-handed short edge rotates rightward by a second angle relative to the central axis of the left rotor element. The left-handed long edges, the front right-handed short edges, and the rear right-handed short edges are all provided with guide grooves.

[0025] After the material enters the twin-screw extruder, it can be moved to the nine-sided meshing rotor element of this device through other conveying thread elements. The material on the left and right sides first comes into contact with the rear left-hand short edge and the rear right-hand short edge, respectively. Since the right rotor element and the left rotor element are meshed in opposite directions, that is, when the right rotor element rotates counterclockwise, the left rotor element rotates clockwise. The rear left-hand short edge and the rear right-hand short edge are both reverse spiral structures (that is, the rotation direction of the edge is opposite to the rotation of the mandrel). Therefore, after the material on the left and right sides comes into direct contact with the rear left-hand short edge and the rear right-hand short edge, it can be pushed backward under the action of the reverse spiral.

[0026] Due to the climbing effect and the subsequent addition of material, the material tends to move forward continuously. At this point, the material flows back and forth. The material that does not directly contact the rear left-hand short edge and the rear right-hand short edge will gradually move forward through the spiral groove (the groove formed between each edge) under the push of the subsequent material. The material that passively flows forward on both sides will be diverted when it passes through the guide groove on the rear left-hand short edge and the rear right-hand short edge. A small amount of material will reach the back of the rear left-hand short edge and the rear right-hand short edge through the guide groove on the rear left-hand short edge and the rear right-hand short edge, and then reach the right-hand long edge and the left-hand long edge respectively.

[0027] Meanwhile, materials that do not pass through the guide channels on the rear left-hand and rear right-hand short edges will gradually move forward under the push of the subsequently added materials until they reach the right-hand and left-hand long edges. Since the right-hand and left-hand long edges are both forward spirals, they can generate a thrust on the contacting materials along the spiral direction. During the forward movement of the materials, a small amount of materials will be diverted through the guide channels on the right-hand and left-hand long edges. Some materials will flow backward, and some materials will pass through the spiral channels to reach another right-hand and left-hand long edge and mix with other materials.

[0028] The material that does not pass through the guide grooves on the right-hand and left-hand long edges continues to move forward. After reaching the front left-hand and front right-hand short edges, the material is pushed back by the reverse spiral action of the front left-hand and front right-hand short edges, and then flows back and forth and is constantly remixed.

[0029] As more and more material is added, the material pushed back by the front left-hand short edge and the front right-hand short edge is forced to move forward. When it passes through the guide groove of the front left-hand short edge and the front right-hand short edge, it is split. That is, part of the material that passes through the guide groove of the front left-hand short edge and the front right-hand short edge flows backward to the right-hand long edge and the left-hand long edge, where it mixes with other materials. Furthermore, the material can continue to move forward under the forward push of the right-hand long edge and the left-hand long edge until the subsequent material fills the screw groove, and the material in front is pushed to the next nine-sided meshing rotor element.

[0030] Because the left and right rotor elements mesh and rotate, the material in the meshing area is continuously compressed under the interaction of multiple edges. Furthermore, due to the constantly changing meshing space, the force on the material also changes continuously, causing abrupt changes in the material flow velocity in the meshing area. These velocity abrupt changes enhance the dispersion of different materials, resulting in a more uniform material distribution. Simultaneously, the shearing generated by these velocity abrupt changes breaks up material agglomerates, resulting in a finer powder in the final product. In addition, since this device can both convey and shear materials, it eliminates the need for multiple single-function screw elements, simplifying the structure.

[0031] In summary, the nine-sided meshing rotor element for the twin-screw extruder provided by this invention can effectively improve the material mixing effect of parallel counter-rotating twin-screw extruders and simplify the screw structure.

[0032] Furthermore, the present invention also provides an extruder comprising the nine-sided meshing rotor element of the above-described twin-screw extruder. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0034] Figure 1 An isometric view of the nine-sided meshing rotor element of the twin-screw extruder provided by the present invention;

[0035] Figure 2 This is a schematic cross-sectional view of the nine-sided meshing rotor element of a twin-screw extruder;

[0036] Figure 3 This is an axial structural diagram of the nine-sided meshing rotor element of a twin-screw extruder;

[0037] Figure 4 This is a planar unfolded view of the rotor element on the right.

[0038] Figure 5 This is a planar unfolded view of the rotor element on the left.

[0039] Figures 1-5 middle:

[0040] 1 is the right rotor element, 101 is the right-hand long ridge, 102 is the first right-hand guide groove, 103 is the front left-hand short ridge, 104 is the third right-hand guide groove, 105 is the rear left-hand short ridge, 106 is the second right-hand guide groove, 2 is the left rotor element, 201 is the left-hand long ridge, 202 is the first left-hand guide groove, 203 is the front right-hand short ridge, 204 is the third left-hand guide groove, 205 is the rear right-hand short ridge, 206 is the second left-hand guide groove, and 3 is the involute inner spline through hole. Detailed Implementation

[0041] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0042] The core of this invention is to provide a nine-sided meshing rotor element for a twin-screw extruder, which can effectively improve the material mixing effect of a parallel counter-rotating twin-screw extruder and simplify the screw structure.

[0043] Another core aspect of this invention is to provide an extruder that includes the nine-sided meshing rotor element of the aforementioned twin-screw extruder.

[0044] Please refer to Figures 1 to 5 , Figure 1 An isometric view of the nine-sided meshing rotor element of the twin-screw extruder provided by the present invention; Figure 2 This is a schematic cross-sectional view of the nine-sided meshing rotor element of a twin-screw extruder; Figure 3 This is an axial structural diagram of the nine-sided meshing rotor element of a twin-screw extruder; Figure 4 This is a planar unfolded view of the rotor element on the right. Figure 5 This is a planar unfolded view of the rotor element on the left.

[0045] This specific embodiment provides a nine-sided meshing rotor element for a twin-screw extruder, including:

[0046] The right rotor element 1 includes three right-handed long ribs 101 evenly distributed along the outer periphery of the middle end of the right rotor element 1, three front left-handed short ribs 103 evenly distributed along the outer periphery of the front end of the right rotor element 1, and three rear left-handed short ribs 105 evenly distributed along the outer periphery of the rear end of the right rotor element 1. Each right-handed long rib 101 rotates to the right by a first angle relative to the central axis of the right rotor element 1, each front left-handed short rib 103 rotates to the left by a second angle relative to the central axis of the right rotor element 1, and each rear left-handed short rib 105 rotates to the left by a second angle relative to the central axis of the right rotor element 1. Each right-handed long rib 101, front left-handed short rib 103, and rear left-handed short rib 105 is provided with a guide groove.

[0047] The left rotor element 2 is a mirror image of the right rotor element 1;

[0048] The spindle is provided in the central shaft hole of both the right rotor element 1 and the left rotor element 2 to drive the right rotor element 1 and the left rotor element 2 to mesh and rotate in opposite directions.

[0049] It should be noted that, since the left rotor element 2 and the right rotor element 1 are mirror images of each other, the left rotor element 2 includes three left-handed long ridges 201 evenly distributed along the outer periphery of the middle of the left rotor element 2, three front right-handed short ridges 203 evenly distributed along the outer periphery of the front end of the left rotor element 2, and three rear right-handed short ridges 205 evenly distributed along the outer periphery of the rear end of the left rotor element 2. Each left-handed long ridge 201 rotates leftward by a first angle relative to the central axis of the left rotor element 2, each front right-handed short ridge 203 rotates rightward by a second angle relative to the central axis of the left rotor element 2, and each rear right-handed short ridge 205 rotates rightward by a second angle relative to the central axis of the left rotor element 2. Each left-handed long ridge 201, front right-handed short ridge 203, and rear right-handed short ridge 205 is provided with a guide groove. Furthermore, since the left rotor element 2 and the right rotor element 1 are completely symmetrical and mirror images of each other, during operation, the left rotor element 2 and the right rotor element 1 mesh with each other and rotate in opposite directions.

[0050] It should also be noted that both the left rotor element 2 and the right rotor element 1 include staggered forward and reverse helical ridges, which can increase the shearing effect on the material and make different materials more evenly dispersed. Furthermore, the staggered arrangement of the forward and reverse helical ridges in this device is not segmented but rather composed of multiple single-function structures connected in series, making the structure more compact and reducing redundancy.

[0051] Additionally, it should be noted that both the right rotor element 1 and the left rotor element 2 use circular tubes with a diameter equal to the diameter of the vertex circle as raw materials, and are processed through a cutting process to obtain the required structure. In practical applications, the shape, structure, and dimensions of the right rotor element 1, the left rotor element 2, and the mandrel can be determined according to the actual situation and requirements.

[0052] Based on the above embodiments, preferably, the front left-hand short rib 103 and the rear left-hand short rib 105 have the same length and are provided with the same number of guide grooves; the length ratio of the right-hand long rib 101 to the front left-hand short rib 103 is n, and the ratio of the number of guide grooves on the right-hand long rib 101 to the number of guide grooves on the front left-hand short rib 103 is n.

[0053] It should be further explained that, since the left rotor element 2 and the right rotor element 1 are mirror images of each other, the front right-hand short rib 203 and the rear right-hand short rib 205 have the same length and the same number of guide grooves; the length ratio of the left-hand long rib 201 to the front right-hand short rib 203 is n, and the ratio of the number of guide grooves on the left-hand long rib 201 to the number of guide grooves on the front right-hand short rib 203 is n.

[0054] Additionally, it should be noted that the forward spiral (right-hand long edge 101 and left-hand long edge 201) effectively conveys materials, while the reverse spiral (front left-hand short edge 103, rear left-hand short edge 105, front right-hand short edge 203, and rear right-hand short edge 205) effectively increases material residence time. Furthermore, the shorter edge length of the reverse spiral prevents excessive local pressure caused by materials being unable to flow forward. Moreover, the guide channels on the forward and reverse spirals provide more branches for material flow, resulting in more uniform mixing. The specific arrangement of the guide channels is related to the length of the corresponding edge, which helps improve the diversion and mixing effect of each edge.

[0055] Preferably, the bottom width of the right-hand long edge 101, the front left-hand short edge 103, and the rear left-hand short edge 105 is less than or equal to 1 / 12 of the circumference of the bottom circle of the right rotor element 1; the top width of the right-hand long edge 101, the front left-hand short edge 103, and the rear left-hand short edge 105 is less than or equal to 1 / 30 of the circumference of the top circle of the right rotor element 1.

[0056] It should be noted that, since the left rotor element 2 and the right rotor element 1 are mirror images of each other, the bottom widths of the left-hand long edge 201, the front right-hand short edge 203, and the rear right-hand short edge 205 are all less than or equal to 1 / 12 of the circumference of the bottom circle of the left rotor element 2; the top widths of the left-hand long edge 201, the front right-hand short edge 203, and the rear right-hand short edge 205 are all less than or equal to 1 / 30 of the circumference of the top circle of the left rotor element 2. This arrangement of the left rotor element 2 and the right rotor element 1 ensures that they mesh with each other without interfering with each other when rotating in opposite directions.

[0057] Additionally, it should be noted that the "base circle" refers to the circle formed by connecting the bases of all the edges, and the "apex circle" refers to the circle formed by connecting the tops of all the edges. Assuming the width of the base is equal to 1 / 12 of the circumference of the base circle of the right rotor element 1, this can mean that the base is set along the outer periphery of the base circle of the right rotor element 1, and the ratio of the arc length of the base to the arc length of the base circle is 1:12, with a base width of 30°. Similarly, the width of the apex is equal to 1 / 30 of the circumference of the apex circle of the right rotor element 1, which can mean that the apex is set along the outer periphery of the apex circle of the right rotor element 1, and the ratio of the arc length of the apex to the arc length of the apex circle is 1:30, with a apex width of 12°. Furthermore, the first angle is 60° and the second angle is 36°. In this case, the planar development of the right rotor element 1 is as follows... Figure 4 As shown, the planar unfolded view of the left rotor element 2 is as follows. Figure 5 As shown.

[0058] In practical applications, the shape, size, structure, and position of each edge can be determined according to the actual situation and needs.

[0059] Preferably, the cross-sections of the guide grooves on the right-hand long edge 101, the front left-hand short edge 103, and the rear left-hand short edge 105 are all isosceles trapezoids, and the groove depth is 1 / 3 to 1 / 2 of the height of the corresponding edge.

[0060] It should be noted that, since the left rotor element 2 and the right rotor element 1 are mirror images of each other, the cross-sections of the guide channels for the left-hand long edge 201, the front right-hand short edge 203, and the rear right-hand short edge 205 are all isosceles trapezoids, and the depth of the guide channels is 1 / 3 to 1 / 2 of the height of the corresponding edge. This design of the guide channels is to improve the material diversion effect. Of course, the cross-section of the guide channels can also be set to rectangles or circles, etc.

[0061] Based on the above embodiments, preferably, a plurality of first right-side guide grooves 102 are provided at equal intervals on the right-hand long ridge 101, the distance between two adjacent first right-side guide grooves 102 is greater than or equal to the widest cross-sectional distance of the first right-side guide grooves 102; the distance from both ends of the first right-side guide grooves 102 to the two end faces of the right-hand long ridge 101 is greater than or equal to the widest cross-sectional distance of the first right-side guide grooves 102.

[0062] It should be noted that, since the left rotor element 2 and the right rotor element 1 are mirror images of each other, a plurality of first left-side guide grooves 202 are provided at equal intervals on the left-hand long ridge 201. The distance between two adjacent first left-side guide grooves 202 is greater than or equal to the widest cross-sectional distance of the first left-side guide grooves 202. The distance from the two ends of the first left-side guide grooves 202 to the two end faces of the left-hand long ridge 201 is greater than or equal to the widest cross-sectional distance of the first left-side guide grooves 202.

[0063] Preferably, a second right-side guide groove 106 is provided in the middle of the rear left-hand short ridge 105. The opening length of the second right-side guide groove 106 is twice the opening length of the first right-side guide groove 102. The distances from both ends of the second right-side guide groove 106 to the two ends of the rear left-hand short ridge 105 are equal. A third right-side guide groove 104 is provided in the middle of the front left-hand short ridge 103. The opening length of the third right-side guide groove 104 is twice the opening length of the first right-side guide groove 102. The distances from both ends of the third right-side guide groove 104 to the two ends of the front left-hand short ridge 103 are equal.

[0064] It should be noted that, since the left rotor element 2 and the right rotor element 1 are mirror images of each other, a second left guide groove 206 is provided in the middle of the rear right-hand short rib 205. The opening length of the second left guide groove 206 is twice the opening length of the first left guide groove 202, and the distances from both ends of the second left guide groove 206 to the two ends of the rear right-hand short rib 205 are equal. A third left guide groove 204 is provided in the middle of the front right-hand short rib 203. The opening length of the third left guide groove 204 is twice the opening length of the first left guide groove 202, and the distances from both ends of the third left guide groove 204 to the two ends of the front right-hand short rib 203 are equal.

[0065] Preferably, the bottoms of the first right-side guide channel 102, the second right-side guide channel 106, and the third right-side guide channel 104 are all rounded. Since the left-side rotor element 2 is a mirror image of the right-side rotor element 1, the bottoms of the first left-side guide channel 202, the second left-side guide channel 206, and the third left-side guide channel 204 are all rounded. The rounded bottoms of each guide channel are provided to prevent material accumulation.

[0066] Preferably, the right rotor element 1 and the mandrel, and the left rotor element 2 and the mandrel are all connected by involute splines. That is, involute internal spline through holes 3 can be machined in the central axis of the right rotor element 1 and the left rotor element 2, and then they can be installed with the involute external spline of the mandrel of the twin-screw extruder.

[0067] Preferably, the first angle is 60° and the second angle is 36°. The following will use this as an example to describe the operation of this device. In this application, "front" refers to the material feeding side and "rear" refers to the feed inlet side.

[0068] After the material enters the twin-screw extruder, it is conveyed to the nine-sided meshing rotor element through other conveying thread elements. The material on the left and right sides first comes into contact with the rear left-hand short rib 105 and the rear right-hand short rib 205, respectively. Since the right rotor element 1 and the left rotor element 2 are meshed in opposite directions, when the right rotor element 1 rotates counterclockwise, the left rotor element 2 rotates clockwise. The rear left-hand short rib 105 and the rear right-hand short rib 205 are both reverse spiral structures. Therefore, after the material on the left and right sides comes into direct contact with the rear left-hand short rib 105 and the rear right-hand short rib 205, it can be pushed backward under the action of the reverse spiral.

[0069] Due to the climbing effect and the subsequent addition of material, the material tends to move forward continuously. At this point, the material flows back and forth. The material that does not directly contact the rear left-hand short rib 105 and the rear right-hand short rib 205 gradually moves forward from the middle of the screw groove under the push of the subsequent material. The material that passively flows forward on both sides is diverted when it passes through the second right-hand guide channel 106 and the second left-hand guide channel 206 respectively. A small amount of material reaches the back of the rear left-hand short rib 105 and the rear right-hand short rib 205 through the second right-hand guide channel 106 and the second left-hand guide channel 206, and reaches the right-hand long rib 101 and the left-hand long rib 201 respectively.

[0070] Meanwhile, materials that do not pass through the second right-side guide channel 106 and the second left-side guide channel 206 will gradually move forward under the push of the subsequently added materials until they reach the right-hand long ridge 101 and the left-hand long ridge 201. The right-hand long ridge 101 and the left-hand long ridge 201 are positive spirals, which can generate a forward thrust along the spiral direction of the contacting materials. During the forward movement of the materials, a small amount of materials will be diverted through the first right-side guide channel 102 and the first left-side guide channel 202. Some materials will flow backward, and some materials will pass through the spiral grooves and reach another right-hand long ridge 101 and left-hand long ridge 201 to mix with other materials.

[0071] The material that does not pass through the first right guide channel 102 and the first left guide channel 202 continues to move forward. After reaching the front left-hand short ridge 103 and the front right-hand short ridge 203, the material is pushed back and forth by the reverse spiral action of the front left-hand short ridge 103 and the front right-hand short ridge 203, and then flows back and forth and is constantly remixed.

[0072] As more and more material is added, the material pushed back by the front left-hand short rib 103 and the front right-hand short rib 203 is forced to move forward. When passing through the third right-hand guide channel 104 and the third left-hand guide channel 204, the material is split. The material passing through the third right-hand guide channel 104 and the third left-hand guide channel 204 flows backward to the right-hand long rib 101 and the left-hand long rib 201, where it mixes with other materials. Furthermore, the material continues to move forward under the forward push of the right-hand long rib 101 and the left-hand long rib 201 until the subsequent material fills the screw groove, and the material in front is pushed to the next nine-sided meshing rotor element.

[0073] As the left rotor element 2 and the right rotor element 1 mesh and rotate with each other, the material in the meshing area is continuously squeezed by the interaction of multiple edges. As the meshing space changes continuously, the magnitude of the force on the material also changes continuously. The material flow rate in the meshing area will also change abruptly due to the change in force. These speed changes will enhance the dispersion of different materials, making the material distribution more uniform. At the same time, the shearing generated by the speed change of the material can break up the material agglomeration, making the powder in the final product more delicate.

[0074] The reverse spiral design of this device effectively increases material residence time, and the shorter length of the reverse spiral edges prevents excessive local pressure caused by material stagnation. Furthermore, the staggered arrangement of the forward and reverse spiral edges increases shearing of the material, resulting in more uniform dispersion of different materials. The staggered, rather than segmented, arrangement of the spiral edges also makes the structure more compact and reduces redundancy. Additionally, the guide grooves on the forward and reverse spiral edges provide multiple branches for material flow, leading to more uniform mixing. By using this device, the goals of longer material residence time, more shearing cycles, better material dispersion, and reduced redundant structure can be achieved.

[0075] In addition to the nine-sided meshing rotor element of the twin-screw extruder described above, the present invention also provides an extruder including the nine-sided meshing rotor element of the twin-screw extruder disclosed in the above embodiments. The structure of other parts of the extruder can be found in the prior art, and will not be described in detail here.

[0076] It should be noted that the first right-side guide channel 102, the second right-side guide channel 106, the third right-side guide channel 104, the first left-side guide channel 202, the second left-side guide channel 206, the third left-side guide channel 204, the first shooting hole 111, the second shooting hole 131, the first angle, and the second angle mentioned in this application are only distinguished by their different positions and do not have any order of precedence.

[0077] In addition, it should be noted that the orientation or positional relationship indicated by "left and right", "front and back", etc. in this application is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the purpose of simplifying the description and making it easier to understand, and is not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0078] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. Any combination of all embodiments provided by this invention is within the scope of protection of this invention and will not be elaborated upon here.

[0079] The extruder and its nine-sided meshing rotor element for the twin-screw extruder provided by this invention have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are merely for the purpose of helping to understand the method and core ideas of this invention. It should be noted that those skilled in the art can make various improvements and modifications to this invention without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of this invention.

Claims

1. A nine-sided meshing rotor element for a twin-screw extruder, characterized in that, include: The right rotor element (1) includes three right-handed long ridges (101) evenly distributed along the outer periphery of the middle of the right rotor element (1), three front left-handed short ridges (103) evenly distributed along the outer periphery of the front end of the right rotor element (1), and three rear left-handed short ridges (105) evenly distributed along the outer periphery of the rear end of the right rotor element (1). Each right-handed long ridge (101) is rotated to the right by a first angle relative to the central axis of the right rotor element (1), each front left-handed short ridge (103) is rotated to the left by a second angle relative to the central axis of the right rotor element (1), and each rear left-handed short ridge (105) is rotated to the left by a second angle relative to the central axis of the right rotor element (1). The right-handed long ridges (101), the front left-handed short ridges (103), and the rear left-handed short ridges (105) are all provided with guides. The flow channels are as follows: the front left-hand short rib (103) and the rear left-hand short rib (105) have the same length and are provided with the same number of flow channels; the length ratio of the right-hand long rib (101) and the front left-hand short rib (103) is n, and the ratio of the number of flow channels on the right-hand long rib (101) to the number of flow channels on the front left-hand short rib (103) is n; the bottom width of the right-hand long rib (101), the front left-hand short rib (103) and the rear left-hand short rib (105) is less than or equal to 1 / 12 of the circumference of the bottom circle of the right rotor element (1); the top width of the right-hand long rib (101), the front left-hand short rib (103) and the rear left-hand short rib (105) is less than or equal to 1 / 30 of the circumference of the top circle of the right rotor element (1); The left rotor element (2) is mirror-image of the right rotor element (1); The spindle is provided in the central shaft hole of both the right rotor element (1) and the left rotor element (2) to drive the right rotor element (1) and the left rotor element (2) to mesh and rotate in opposite directions.

2. The nine-sided meshing rotor element of the twin-screw extruder according to claim 1, characterized in that, The cross-sections of the guide grooves on the right-hand long edge (101), the front left-hand short edge (103), and the rear left-hand short edge (105) are all isosceles trapezoids, and the depth of the guide groove is 1 / 3 to 1 / 2 of the height of the corresponding edge.

3. The nine-sided meshing rotor element of the twin-screw extruder according to claim 2, characterized in that, The right-hand long ridge (101) is provided with a plurality of first right-side guide grooves (102) at equal intervals, and the distance between two adjacent first right-side guide grooves (102) is greater than or equal to the widest distance of the cross-section of the first right-side guide grooves (102). The distance from both ends of the first right-side guide channel (102) to both ends of the right-hand long ridge (101) is greater than or equal to the widest spacing of the cross-section of the first right-side guide channel (102).

4. The nine-sided meshing rotor element of the twin-screw extruder according to claim 3, characterized in that, The middle part of the rear left-hand short rib (105) is provided with a second right-hand guide groove (106), the opening length of the second right-hand guide groove (106) is twice the opening length of the first right-hand guide groove (102), and the distances from both ends of the second right-hand guide groove (106) to both ends of the rear left-hand short rib (105) are equal. The middle part of the front left-hand short rib (103) is provided with a third right-hand guide groove (104). The opening length of the third right-hand guide groove (104) is twice the opening length of the first right-hand guide groove (102). The distances from the two ends of the third right-hand guide groove (104) to the two ends of the front left-hand short rib (103) are equal.

5. The nine-sided meshing rotor element of the twin-screw extruder according to claim 4, characterized in that, The bottoms of the first right-side guide channel (102), the second right-side guide channel (106), and the third right-side guide channel (104) are all provided with rounded corners.

6. The nine-sided meshing rotor element of the twin-screw extruder according to any one of claims 1 to 5, characterized in that, The right rotor element (1) and the mandrel, and the left rotor element (2) and the mandrel are all connected by involute splines.

7. The nine-sided meshing rotor element of the twin-screw extruder according to any one of claims 1 to 5, characterized in that, The first angle is 60°, and the second angle is 36°.

8. An extruder, characterized in that, Includes the nine-sided meshing rotor element of the twin-screw extruder as described in any one of claims 1-7.

Images