Disc-shaped granulating block and dynamic meshing clearance analysis method thereof

Abstract

The invention discloses a disc-shaped granulating block and a dynamic meshing clearance analysis method thereof, the disc-shaped granulating block comprises a left granulating block and a right granulating block, the shape contour of the granulating block is composed of two concentric arcs which are in circumferential symmetry and a transition arc which is arranged between the two concentric arcs and is in circumferential symmetry; the circle center of the transition arc is arranged on the perpendicular bisector where the centers of the two concentric arcs are connected. According to the method, the thread inner diameter d1, the thread outer diameter D1 and the double-screw gap e1 of the front-section conveying double screws of the continuous wet granulator are used as geometric design bases, the outer contour of the rear-section disc-shaped granulation block is designed, on the basis, meshing of the two granulation blocks is constructed, the working dynamic gap S12 generated when the two granulation blocks rotate by one circle is analyzed, and the working dynamic gap S12 of the two granulation blocks rotating by one circle is analyzed. According to the method, the gap value of the granulation block at any moment can be accurately calculated, a basis is provided for the particle size of the granulation block, the geometric parameters of the contour of the granulation block can be adjusted according to the application requirement of the actual particle size, and the purpose of adjusting the particle size of the granulation block and the distribution of the granulation block is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of continuous wet granulation, in particular to a disc-shaped granulation block and a dynamic meshing gap analysis method thereof. Background Art

[0002] In recent years, the food, chemical, and pharmaceutical industries have gradually shifted from traditional centralized wet granulation of powders to continuous wet granulation. The core component of continuous wet granulation equipment is the granulation block, whose structural design characteristics directly determine the size and distribution of the granules produced by continuous manufacturing. Currently, there are many types of granulation blocks used in actual production, including circular, disc-shaped, and tooth-shaped ones, but all are mainly designed for operational performance. There is no effective method for quantitative design of their structure and analysis of the dynamic meshing clearance during operation. This makes it difficult to accurately control the particle size obtained by the granulation block after powder processing, often resulting in the particle size of the granules not meeting the expected requirements. Summary of the Invention

[0003] In order to solve the problem that the existing continuous wet granulation technology has no quantitative design of the granulation block structure and no effective analysis method for the working dynamic meshing gap, which makes it difficult to accurately control the particle size and fails to meet the expected requirements, the present invention provides a disc-shaped granulation block and a dynamic meshing gap analysis method thereof. The outer contour of the disc-shaped granulation block in the rear section is designed based on the inner diameter d1 and outer diameter D1 of the twin screws in the front section of the continuous wet granulator and the gap e1 of the twin screws. On this basis, the meshing of the two granulation blocks is constructed with a relative meshing phase of 90°, and the working dynamic meshing gap S of the two granulation blocks after one rotation is analyzed. 12 After analysis, 9 dynamic gaps S are obtained. 12 The calculation formula provides a basis for obtaining the particle size. Based on the application requirements of the actual particle size, the contour geometric parameters of the disc-shaped granulating block can be adjusted to change the dynamic meshing clearance S. 12 The size of the particles is adjusted to achieve the purpose of adjusting the particle size and its distribution.

[0004] To achieve the above object, the present invention provides a disc-shaped granulating block, comprising a left granulating block, a right granulating block and a screw sleeve, wherein the screw sleeve is provided with an ∞ inner cavity, the left granulating block and the right granulating block are respectively sleeved on the left and right sides of the ∞ inner cavity of the screw sleeve, and are respectively sleeved with the two twin screws of the front section of the continuous wet granulator that rotate in the same direction and mesh with each other, and respectively rotate with the corresponding conveying screw, characterized in that: the outer contour of the left granulating block body is composed of two circumferentially symmetrical concentric arcs and a circumferentially symmetrical transition arc arranged between the two concentric arcs, the center of the transition arc is arranged on the mid-perpendicular line connecting the centers of the two concentric arcs, a through hole is provided in the middle of the left granulating block body, the through hole is a regular hexagonal hole or a regular octagonal hole or an internal spline hole, a coaxial circular boss is provided on the end surface of one end of the left granulating block body, the left granulating block and the right granulating block belong to the same entity, and the meshing phase of the left granulating block and the right granulating block is set to 90 degrees;

[0005] The left and right granulation blocks inherit the conveying characteristics of the twin screws in the front section of the continuous wet granulator. The rotation center distance between the left and right granulation blocks is equal to the center distance of the twin screws. The diameter of the concentric arc is equal to the outer diameter D1 of the twin screw threads. The initial position of the left granulation block is set to be horizontal, and the right granulation block is set to be vertical. The initial gap e0 between the left and right granulation blocks is equal to the twin screw gap e1.

[0006] The rotation centers of the left and right pelletizing blocks are set as O1 and O2 respectively. The center distance calculation formula of the left and right pelletizing blocks is:

[0007]

[0008] Where: d1 is the inner diameter of the twin screw thread (mm), D1 is the outer diameter of the twin screw thread (mm), e1 is the twin screw gap (mm), e0 is the initial gap between the left and right pelletizing blocks (mm), and W is the maximum span of the two transition arcs (mm);

[0009] From formula 1, we can get W = d1 (2)

[0010] The calculation formula for the transition arc diameter D2 is:

[0011]

[0012] Where: W is the maximum span of the two transition arcs (mm), B is the chord length of the concentric arc on one side (mm), and D1 is the outer diameter of the twin screw thread (mm);

[0013] The ∞ inner cavity is two inner cylindrical cavities generated by rotating with O1 and O2 as the center and D1+2e1 as the diameter.

[0014] As a further improvement of the present technology, the thickness h1 of the left granulating block body is set to 2-10 mm, the height h2 of the circular boss is set to 0.3-1.0 mm; the outer diameter of the circular boss is equal to the inner diameter d1 of the twin-screw thread.

[0015] The function of the circular boss is to prevent friction interference from occurring on the end faces of the disc-shaped granulating blocks when the multiple groups of meshing disc-shaped granulating blocks are working.

[0016] The present invention also provides a method for analyzing the dynamic meshing clearance of the disc-shaped granulating block, which is characterized by comprising the following steps:

[0017] S1. Set the initial position of the left granulating block to be horizontal, and the right granulating block to be in 90° meshing phase with the left granulating block, and determine the initial gap between the left granulating block and the right granulating block to be e0=e1; where: e1 is the twin-screw gap;

[0018] S2. Determine the calculation formula for the central angle θ1 of the concentric arc based on the concentric arc diameter D1 and the concentric arc chord length B;

[0019] Based on the transition arc diameter D2 and the maximum span W of the two transition arcs, determine the calculation formula for the distance between the concentric arcs and the transition arc centers O3 and O4 respectively;

[0020] S3, taking the left granulation block as the analysis object, establishing the X O1Y1 rectangular coordinates with the rotation center O1 of the left granulation block, X is collinear with the center line connecting the two concentric arcs of the left granulation block, Y1 is collinear with the center line connecting the two transition arcs of the left granulation block, and the outer contour of the left granulation block is divided into eight arcs by the four endpoints M1, N1, E1, F1 of the two concentric arcs, the midpoints A1 and B1 of the two concentric arcs, and the midpoints C1 and D1 of the two transition arcs. The eight arcs are A1M1, M1C1, C1E1, E1B1, B1F1, F1D1, D1N1, and N1A1 in counterclockwise order starting from the first quadrant;

[0021] S4. Determine the range of the central angles of the eight arcs in step S3 based on the central angle θ1 of the concentric arcs, and the calculation formula for the rotation radius R1 of the eight arcs around O1:

[0022] Arc segments A1M1, E1B1, B1F1, and N1A1 are all concentric arc segments. The rotation radius of any point P1 on the four concentric arc segments around O1 is the radius of the concentric arc = D1 / 2;

[0023] Take any point P1 on the arc segments M1C1 and C1E1, and draw lines connecting P1, O1, and O3 to form a triangle △P1O1O3. Use the triangle cosine theorem to determine the calculation formula for P1O1. P1O1 is the rotation radius R1 of any point P1 on the arc segments M1C1 and C1E1 rotating around O1, thus determining the calculation formula for the rotation radius R1.

[0024] Take any point P1 on the arc segments F1D1 and D1N1, draw lines connecting P1, O1, and O4 to form a triangle △P1O1O4. Use the triangle cosine theorem to determine the calculation formula for P1O1. P1O1 is the rotation radius R1 of any point P1 on the arc segments F1D1 and D1N1 rotating around O1, thereby determining the calculation formula for the rotation radius R1.

[0025] S5, set up XO2Y2 rectangular coordinates with right granulation block rotation center O2, X is collinear with the center line of two transition circular arcs of right granulation block, Y2 is collinear with the center line of two concentric circular arcs of right granulation block, with four endpoints M2, N2, E2, F2, the midpoint D2, C2 of two transition circular arcs and the midpoint A2, B2 of two concentric circular arcs, the right granulation block outer contour is divided into eight sections of circular arcs, these eight sections of circular arcs are D2N2, N2A2, A2M2, M2C2, C2E2, E2B2, B2F2, F2D2 in counterclockwise order from the first quadrant, adopt the same processing approach of step S4, determine the central angle range of these eight sections of circular arcs and the rotation radius R2 computing formula of these eight sections of circular arcs around O2;

[0026] S6, the left granulation block and the right granulation block rotate at the same speed and in the same direction at the same time, so that the meshing phase of the left granulation block and the right granulation block is always 90 degrees. During the rotation operation, the sweep points of the outer contours of the left granulation block and the right granulation block on the X axis are set to S1 and S2 respectively, and the distance S between the sweep points S1 and S2 is set to 12 As the dynamic gap between the two granulating blocks, the dynamic gap S of the two granulating blocks on the X axis when the left granulating block and the right granulating block rotate at any angle θ is determined according to the calculation formula of the rotation radius R1 and R2 corresponding to the phase position of the points S1 and S2 on the outer contour. 12 Calculation formula;

[0027] S7. Determine the calculation formula of the relationship between the arbitrary rotation angle θ of the granulating block and the working time t, and determine the calculation formula of the relationship between the change period t1 of the dynamic gap S12 and the rotation speed n of the granulating block.

[0028] As a further improvement of this technology, the calculation formula of θ1 in step S2 is:

[0029]

[0030] Where: D1 is the outer diameter of the twin screw thread (mm), B is the chord length of the concentric arc (mm).

[0031] As a further improvement of this technology, the calculation formula of O1O3 or O1O4 in step S2 is:

[0032]

[0033] Where: D2 is the diameter of the transition arc (mm); W is the maximum span between the two transition arcs (mm).

[0034] As a further improvement of the present technology, the rotation radius R1 of the eight arcs A1M1, M1C1, C1E1, E1B1, B1F1, F1D1, D1N1, and N1A1 around the center O1 in step S4 is as follows:

[0035] 1) A1M1 segment:

[0036]

[0037] 2)M1C1 segment:

[0038] Using the cosine theorem in △P1O1O3, we can get:

[0039]

[0040] Solving the above quadratic equation yields:

[0041]

[0042] 3) C1E1 segment:

[0043] Using the cosine theorem in △P1O1O3, we can get:

[0044]

[0045] Solving the above quadratic equation yields:

[0046]

[0047] 4) E1B1 segment:

[0048]

[0049] 5)B1F1 segment:

[0050]

[0051] 6) F1D1 segment: Using the cosine theorem in △P1O1O4, we can get:

[0052]

[0053] Solving the above quadratic equation yields:

[0054]

[0055] 7) D1N1 segment: Using the cosine theorem in △P1O1O4, we can get:

[0056]

[0057] Solving the above quadratic equation yields:

[0058] 8) N1A1 segment:

[0059]

[0060] Since the calculation formulas for the rotation radius of M1C1 and C1E1, E1B1 and B1F1, F1D1 and D1N1 are consistent, and O1O3=O1O4, the calculation formulas of the eight arcs A1M1, M1C1, C1E1, E1B1, B1F1, F1D1, D1N1, and N1A1 are adjusted to the calculation formulas of the five arcs A1M1, M1E1, E1F1, F1N1, and N1A1, and are set to R 11 、R 12 、R 13 、R 14 、R 15 , the calculation formula (6) is as follows:

[0061]

[0062] Where: θ is the phase angle (°) of any point P1 on each arc segment, θ1 is the central angle of the single-sided concentric arc (°), D1 is the outer diameter of the twin-screw thread (mm), D2 is the diameter of the transition arc (mm), and O1O3 is the distance between the centers of the concentric arc and the transition arc (mm).

[0063] As a further improvement of the present technology, the rotation radius R2 of the eight arcs D2N2, N2A2, A2M2, M2C2, C2E2, E2B2, B2F2, and F2D2 around the center O2 in step S5 is as follows:

[0064] 1) D2N2 segment:

[0065] Using the cosine theorem in △P2O2O4, we can get:

[0066]

[0067] Solving the above quadratic equation yields:

[0068]

[0069] 2) N2A2 segment:

[0070]

[0071] 3) A2M2 segment:

[0072]

[0073] 4)M2C2 segment: Using the cosine theorem in △P2O2O3, we can get:

[0074]

[0075] Solving the above quadratic equation yields:

[0076]

[0077] 5) C2E2 segment: Using the cosine theorem in △P2O2O3, we can get:

[0078]

[0079] Solving the above quadratic equation yields:

[0080]

[0081] 6) E2B2 segment:

[0082]

[0083] 7)B2F2 segment:

[0084]

[0085] 8) F2D2 segment: Using the cosine theorem in △P2O2O4, we can get:

[0086]

[0087] Solving the above quadratic equation yields:

[0088]

[0089] The calculation formulas for the rotation radius of N2A2 and A2M2, M2C2 and C2E2, E2B2 and B2F2 are consistent. The calculation formulas for the eight arcs D2N2, N2A2, A2M2, M2C2, C2E2, E2B2, B2F2, and F2D2 are adjusted to the calculation formulas for the five arcs D2N2, N2M2, M2E2, E2F2, and F2D2, and are set as R 21 、R 22 、R 23 、R 24 、R 25 , the calculation formula (7) is as follows:

[0090]

[0091] Where: θ is the phase angle (°) of any point P2 on each arc segment, θ1 is the central angle of the concentric arc (°), D1 is the outer diameter of the twin screw thread (mm), D2 is the diameter of the transition arc (mm), and O1O3 is the distance between the centers of the concentric arc and the transition arc (mm).

[0092] As a further improvement of this technology, the dynamic gap calculation formula in step S6 is:

[0093] S 12 =O1O2-(R1+R2)

[0094] According to the arc segment phases corresponding to the five calculation formulas in R1 and the five calculation formulas in R2, the nine-segment dynamic clearance expressions of the two granulating blocks for one rotation can be obtained. The simplified expressions are as follows:

[0095]

[0096] Substituting formulas (6) and (7) into the equations, we can obtain the dynamic clearance S of the left and right material blocks after one rotation: 12 The specific calculation formula (8) is as follows:

[0097]

[0098]

[0099] As a further improvement of this technology, the relationship between the radian a, the rotation speed n, and the time t corresponding to the rotation of the pelletizing block at any angle θ is calculated as follows:

[0100]

[0101] Where: n is the rotation speed of the pelletizing block (r / min), t is the working time (s);

[0102] The pelletizing block can be rotated at any angle

[0103] The working time t1 of two granulating blocks rotating 360° is the dynamic gap S. 12 The change cycle,

[0104] The dynamic clearance S can be obtained 12 The calculation formula of the change period t1 is as follows:

[0105]

[0106] At a fixed speed n, the meshing gap S of the two granulating blocks changes with time t. 12 It changes periodically, and each rotation is a dynamic meshing gap S 12 The faster the speed, the shorter the dynamic gap change cycle to complete a circle.

[0107] Compared with the prior art, the present invention has the following beneficial effects: the present invention adopts a geometric parameterization method to design the structure of a disc-shaped granulation block. In the continuous wet granulation process, the outer contour of the rear disc-shaped granulation block is designed based on the determined inner diameter d1, outer diameter D1 of the screw thread of the front conveying screw and the twin screw gap e1 that meet a certain conveying capacity. On this basis, the meshing of the left granulation block and the right granulation block is constructed, with a relative meshing phase of 90°, and the working dynamic meshing gap S of the two granulation blocks after one rotation is calculated. 12 After analysis, 9 dynamic gaps S are obtained. 12 The calculation formula can accurately calculate the gap value of the meshing disc-shaped granulating block at any time, thus providing a basis for the particle size of the particles. The dynamic gap S 12 The larger the particle size, the greater the proportion of large particles. Based on the application requirements of the actual particle size, the contour geometric parameters of the disc-shaped granulating block (concentric arc diameter, transition arc diameter, concentric arc center angle) can be adjusted to change the dynamic meshing gap S 12 The size of the particles is adjusted to achieve the purpose of adjusting the particle size and its distribution. BRIEF DESCRIPTION OF THE DRAWINGS

[0108] Figure 1 This is a schematic structural diagram of an embodiment of the present invention;

[0109] Figure 2 This is a schematic diagram of the structure of a disc-shaped granulation block according to an embodiment of the present invention;

[0110] Figure 3 This is an auxiliary schematic diagram for calculating the rotation radius of any point P1 on the arc segment M1C1 around O1 according to an embodiment of the present invention;

[0111] Figure 4 This is an auxiliary schematic diagram for calculating the rotation radius of any point P1 on the arc segment C1E1 around O1 according to an embodiment of the present invention;

[0112] Figure 5 This is an auxiliary schematic diagram for calculating the rotation radius of any point P1 on the arc segment F1D1 around O1 according to an embodiment of the present invention;

[0113] Figure 6 This is an auxiliary schematic diagram for calculating the rotation radius of any point P1 on the arc segment D1N1 around O1 according to an embodiment of the present invention;

[0114] Figure 7 Schematic diagram illustrating auxiliary calculation of the rotation radius of any point P2 on arc segments D2N2 and M2C2 around O2 according to an embodiment of the present invention;

[0115] Figure 8 Schematic diagram illustrating auxiliary calculation of the rotation radius of any point P2 on arc segments C2E2 and F2D2 around O2 according to an embodiment of the present invention;

[0116] Figure 9 The left and right granulating blocks of the present invention are simultaneously rotated in the same direction and at a constant speed at any angle, and the sweep points S1 and S2 of the outer contours on the X-axis are shown, as well as the dynamic clearance S. 12 Schematic diagram;

[0117] Figure 10 This is a diagram showing the periodic change of the dynamic gap when the left and right granulation blocks rotate one circle according to an embodiment of the present invention.

[0118] In the figure: 1. left granulation block, 101. granulation block body, 1011. concentric arc, 1012. transition arc, 102. regular hexagonal through hole, 103. circular boss, 2. right granulation block, 3. screw sleeve. DETAILED DESCRIPTION

[0119] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0120] like Figure 1 、 2As shown, the embodiment of the present invention includes a left granulating block 1, a right granulating block 2 and a screw sleeve 3, wherein an inner cavity 301 is provided in the screw sleeve 3, and the left granulating block 1 and the right granulating block 2 are respectively sleeved on the left and right sides of the inner cavity 301 in the screw sleeve 3, and are respectively sleeved with the two twin screws rotating in the same direction and meshing with each other in the front section of the continuous wet granulator, and rotate together with the corresponding conveying screws. The outer contour of the left granulating block body 101 is composed of two circumferentially symmetrical concentric arcs 1011 and A transition arc 1012 is provided between two concentric arcs 1011 and is symmetrical in shape. The center of the transition arc 1012 is provided on the perpendicular bisector connecting the centers of the two concentric arcs 1011. A regular hexagonal through hole 102 is provided in the middle of the left granulating block body 101. A coaxial circular boss 103 is provided on one end surface of the left granulating block body 101. The left granulating block 1 and the right granulating block 2 belong to the same entity, and the meshing phase of the left granulating block 1 and the right granulating block 2 is set to 90°.

[0121] The left granulation block 1 and the right granulation block 2 inherit the conveying characteristics of the twin screw in the front section of the continuous wet granulator. The rotation center distance between the left granulation block 1 and the right granulation block 2 is equal to the center distance of the twin screw. The diameter of the concentric arc 1011 is equal to the outer diameter D1 of the twin screw thread. The initial position of the left granulation block 1 is set to be horizontal, and the right granulation block 2 is set to be vertical. The initial gap e0 between the left granulation block 1 and the right granulation block 2 is equal to the gap e1 between the twin screws.

[0122] The rotation centers of the left and right pelletizing blocks are set as O1 and O2 respectively. The center distance calculation formula of the left and right pelletizing blocks is:

[0123]

[0124] Where: d1 is the inner diameter of the twin screw thread (mm), D1 is the outer diameter of the twin screw thread (mm), e1 is the twin screw gap (mm), e0 is the initial gap between the left and right pelletizing blocks (mm), and W is the maximum span of the two transition arcs (mm);

[0125] From formula 1, we can get W = d1 (2)

[0126] The calculation formula for the transition arc diameter D2 is:

[0127]

[0128] Where: W is the maximum span of the two transition arcs (mm), B is the chord length of the concentric arc on one side (mm), and D1 is the outer diameter of the twin screw thread (mm);

[0129] In this embodiment, the inner diameter of the thread of the front conveying twin screw is d1 = 19 mm, the outer diameter of the thread is D1 = 28 mm, the twin screw gap is e1 = 0.5 mm, and the chord length of the concentric arc is B = 3 mm. Substituting into formulas 1, 2, and 3 respectively, we can obtain O1O2 = 24 mm, W = 19 mm, and D2 = 32.22 mm

[0130] The inner cavity 301 is an inner cylindrical cavity generated by rotating two circles with O1 and O2 as the center and D1+2e1=29 mm as the diameter.

[0131] The thickness h1 of the left granulating block body 101 is set to 4.5 mm, and the height h2 of the circular boss 103 is set to 0.5 mm; the outer diameter of the circular boss 103 is equal to the inner diameter of the twin-screw thread d1 = 19 mm.

[0132] The function of the circular boss 103 is to prevent friction interference between the end faces of the disc-shaped granulating blocks when the multiple groups of meshing disc-shaped granulating blocks are working.

[0133] The above establishes a set of disc-shaped granulation block unit structures.

[0134] In the axial direction, every two disc-shaped granulation blocks (left granulation block 1 and right granulation block 2) constitute a group of meshing units. Multiple groups of meshing can be used to form a group of disc-shaped granulation blocks, which all meet the requirement that the meshing disc-shaped granulation blocks have a phase difference of 90°, and the two adjacent disc-shaped granulation blocks on the same axis have a phase difference of 60°.

[0135] The method for analyzing the dynamic meshing clearance of a disc-shaped granulating block according to an embodiment of the present invention comprises the following steps:

[0136] S1, such as Figure 1 As shown, the left granulating block 1 is initially positioned horizontally, the right granulating block 2 is meshed with the left granulating block 1 at 90°, and the initial gap between the left granulating block 1 and the right granulating block 2 is determined to be e0=e1=0.5mm;

[0137] S2. Based on the concentric arc diameter D1 and the concentric arc chord length B, the calculation formula for determining the central angle θ1 of the concentric arc is as follows:

[0138]

[0139] Based on the transition arc diameter D2 and the maximum span W of the two transition arcs, the calculation formula for determining the spacing between the concentric arcs and the transition arc centers O3 and O4 is as follows:

[0140]

[0141] S3, taking the left granulation block 1 as the analysis object, establishing the X O1Y1 rectangular coordinates with the rotation center O1 of the left granulation block 1, X is collinear with the center line connecting the two concentric arcs 1011 of the left granulation block 1, Y1 is collinear with the center line connecting the two transition arcs 1012 of the left granulation block 1, and the outer contour of the left granulation block 1 is divided into eight arcs by the four endpoints M1, N1, E1, F1 of the two concentric arcs 1011, the midpoints A1 and B1 of the two concentric arcs 1011 and the midpoints C1 and D1 of the two transition arcs 1012. The eight arcs are A1M1, M1C1, C1E1, E1B1, B1F1, F1D1, D1N1, and N1A1 in counterclockwise order starting from the first quadrant;

[0142] S4. Determine the range of the central angles of the eight arcs in step S3 based on the central angle θ1 of the concentric arc 1011, and the calculation formula for the rotation radius R1 of the eight arcs around O1:

[0143] Arc segments A1M1, E1B1, B1F1, and N1A1 are all concentric arc segments. The rotation radius of any point P1 on the four concentric arc segments around O1 is the radius of the concentric arc = D1 / 2;

[0144] Take any point P1 on the arc segments M1C1 and C1E1, and draw lines connecting P1, O1, and O3 to form a triangle △P1O1O3. Use the triangle cosine theorem to determine the calculation formula for P1O1. P1O1 is the rotation radius R1 of any point P1 on the arc segments M1C1 and C1E1 rotating around O1, thus determining the calculation formula for the rotation radius R1.

[0145] Take any point P1 on the arc segments F1D1 and D1N1, draw lines connecting P1, O1, and O4 to form a triangle △P1O1O4. Use the triangle cosine theorem to determine the calculation formula for P1O1. P1O1 is the rotation radius R1 of any point P1 on the arc segments F1D1 and D1N1 rotating around O1, thereby determining the calculation formula for the rotation radius R1.

[0146] The specific analysis process is as follows:

[0147] 1) A1M1 segment: 0<θ≤6.15°

[0148]

[0149] 2) M1C1 segment: 6.15°<θ≤90° (e.g. Figure 3 shown)

[0150] Using the cosine theorem in △P1O1O3, we can get:

[0151]

[0152] Solving the above quadratic equation yields:

[0153]

[0154] 3) C1E1 segment: 90°<θ≤173.85° (e.g. Figure 4 shown)

[0155] Using the cosine theorem in △P1O1O3, we can get:

[0156]

[0157] Solving the above quadratic equation yields:

[0158]

[0159] 4) E1B1 segment: 173.85°<θ≤180°

[0160]

[0161] 5)B1F1 segment: 180°<θ≤186.15°

[0162]

[0163] 6) F1D1 segment: 186.15°<θ≤270° (e.g. Figure 5 shown)

[0164] Using the cosine theorem in △P1O1O4, we can get:

[0165]

[0166] Solving the above quadratic equation yields:

[0167]

[0168] 7) D1N1 segment: 270°<θ≤353.85° (e.g. Figure 6 shown)

[0169] Using the cosine theorem in △P1O1O4, we can get:

[0170]

[0171] Solving the above quadratic equation yields:

[0172]

[0173] 8) N1A1 segment: 353.85°<θ≤360°

[0174]

[0175] Since the calculation formulas for the rotation radius of M1C1 and C1E1, E1B1 and B1F1, F1D1 and D1N1 are consistent, and O1O3=O1O4, the calculation formulas of the eight arcs A1M1, M1C1, C1E1, E1B1, B1F1, F1D1, D1N1, and N1A1 are adjusted to the calculation formulas of the five arcs A1M1, M1E1, E1F1, F1N1, and N1A1, and are set to R 11 、R 12 、R 13 、R 14 、R 15 , the calculation formula (6) is as follows:

[0176]

[0177] S5, set up XO2Y2 rectangular coordinates with right granulation block 2 rotation center O2, X is collinear with the center line of two transition circular arcs of right granulation block 2, Y2 is collinear with the center line of two concentric circular arcs of right granulation block 2, with four endpoints M2, N2, E2, F2, the midpoint D2, C2 of two transition circular arcs and the midpoint A2, B2 of two concentric circular arcs, right granulation block 2 outer contour is divided into eight sections of circular arcs, these eight sections of circular arcs are D2N2, N2A2, A2M2, M2C2, C2E2, E2B2, B2F2, F2D2 in counterclockwise order from the first quadrant, adopt the same processing approach of step S4, determine the central angle range of these eight sections of circular arcs and the rotation radius R2 calculation formula of these eight sections of circular arcs around O2;

[0178] 1) D2N2 segment: 0<θ≤83.85° (e.g. Figure 7 shown)

[0179] Using the cosine theorem in △P2O2O4, we can get:

[0180]

[0181] Solving the above quadratic equation yields:

[0182]

[0183] 2) N2A2 segment: 83.85°<θ≤90°

[0184]

[0185] 3) A2M2 segment: 90°<θ≤96.15°

[0186]

[0187] 4) M2C2 segment: 96.15°<θ≤180° (e.g. Figure 7 shown)

[0188] Using the cosine theorem in △P2O2O3, we can get:

[0189]

[0190] Solving the above quadratic equation yields:

[0191]

[0192] 5) C2E2 segment: 180°<θ≤263.85° (e.g. Figure 8 shown)

[0193] Using the cosine theorem in △P2O2O3, we can get:

[0194]

[0195] Solving the above quadratic equation yields:

[0196]

[0197] 6) E2B2 segment: 263.85°<θ≤270°

[0198]

[0199] 7)B2F2 segment:

[0200]

[0201] 8) F2D2 segment: 276.15°<θ≤360° (e.g. Figure 8 shown)

[0202] Using the cosine theorem in △P2O2O4, we can get:

[0203]

[0204] Solving the above quadratic equation yields:

[0205]

[0206] Similarly, because the calculation formulas for the rotation radius of N2A2 and A2M2, M2C2 and C2E2, E2B2 and B2F2 are consistent, the calculation formulas of the eight arcs D2N2, N2A2, A2M2, M2C2, C2E2, E2B2, B2F2, and F2D2 are adjusted to the calculation formulas of the five arcs D2N2, N2M2, M2E2, E2F2, and F2D2, and are set as R21 、R 22 、R 23 、R 24 、R 25 , the calculation formula (7) is as follows:

[0207]

[0208] S6, the left granulation block 1 and the right granulation block 2 rotate at the same speed in the same direction at the same time, so that the meshing phase of the left granulation block 1 and the right granulation block 2 is always 90 degrees. During the rotation operation, the sweep points of the outer contours of the left granulation block 1 and the right granulation block 2 on the X axis are set to S1 and S2 respectively, and the distance S between the sweep points S1 and S2 is set to 12 As the dynamic gap between the two pelletizing blocks (such as Figure 9 As shown), according to the rotation radius R1 and R2 corresponding to the phase position of the points S1 and S2 on the outer contour, the dynamic clearance S of the two granulating blocks on the X axis when the left granulating block 1 and the right granulating block 2 rotate at any angle θ at the same time is determined. 12 The calculation formula is as follows:

[0209] Dynamic clearance S 12 =O1O2-(R1+R2),

[0210] According to the arc segment phase corresponding to the 5 calculation formulas in R1 and the 5 calculation formulas in R2, the calculation formulas (6) and (7) are substituted to obtain the 9 dynamic gaps S when the left and right material blocks rotate one circle. 12 The calculation formula (8) is as follows:

[0211]

[0212] At this point, the meshing gap of the granulating block is adjusted from the initial gap e0 to S 12 Dynamic change analysis is carried out according to this method.

[0213] Figure 10 The figure shows the periodic variation of the dynamic gap between the left and right granulating blocks when the left and right granulating blocks rotate one circle, which is calculated according to Formula 8. It can be seen from the figure that the maximum gap in the dynamic gap between the two granulating blocks in this embodiment is 2.514 mm and the minimum gap is 0.5 mm.

[0214] S7. The relationship between the radian a, speed n, and time t corresponding to the rotation of the pelletizing block at any angle θ is calculated as follows:

[0215]

[0216] Where: n is the rotation speed of the pelletizing block (r / min), t is the working time (s);

[0217] The pelletizing block can be rotated at any angle

[0218] By the above formula (10) and the 9-segment dynamic gap S 12 The calculation formula (8) can accurately calculate the gap value between the two meshing disc-shaped granulating blocks in this embodiment at any time, thereby providing a basis for obtaining the particle size. The dynamic gap S 12 The larger the particle size, the greater the proportion of large particles. Based on the application requirements of the actual particle size, the contour geometric parameters of the disc-shaped granulating block (concentric arc diameter, transition arc diameter, concentric arc center angle) can be adjusted to change the dynamic meshing gap S 12 The size of the particles is adjusted to achieve the purpose of adjusting the particle size and its distribution.

[0219] The working time t1 of two granulating blocks rotating 360° is the dynamic gap S. 12 The change cycle,

[0220] The dynamic clearance S can be obtained 12 The calculation formula of the change period t1 is as follows:

[0221]

[0222] In this embodiment, the rotation speed of the pelletizing block is 300 r / min. Substituting into formula 10, we can get:

[0223] t1=0.2s

[0224] The meshing clearance of the pelletizing block is Figure 10 The gap changes periodically, and the dynamic gap change cycle time t1 to complete a 360° cycle is 0.2s.

[0225] The above are only preferred embodiments of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A disc-shaped granulating block, comprising a left granulating block, a right granulating block, and a screw sleeve, wherein the screw sleeve has an inner cavity. The left granulating block and the right granulating block are respectively sleeved on the left and right sides of the inner cavity of the screw sleeve and are respectively sleeved with two co-rotating and intermeshing twin screws in the front section of a continuous wet granulator, and rotate with the corresponding conveying screws. The invention is characterized in that: The outer contour of the left granulation block body consists of two circumferentially symmetrical concentric arcs and a circumferentially symmetrical transition arc arranged between the two concentric arcs. The center of the transition arc is set on the perpendicular bisector connecting the centers of the two concentric arcs. A through hole is provided in the middle of the left granulation block body. The through hole is a regular hexagonal hole, a regular octagonal hole or an internal spline hole. A coaxial circular boss is provided on an end surface of one end of the left granulation block body. The left granulation block and the right granulation block belong to the same entity, and the meshing phase of the left granulation block and the right granulation block is set to 90°. The left and right granulation blocks inherit the conveying characteristics of the twin screws in the front section of the continuous wet granulator. The rotation center distance between the left and right granulation blocks is equal to the center distance of the twin screws. The diameter of the concentric arc is equal to the outer diameter D1 of the twin screw threads. The initial position of the left granulation block is set to be horizontal, and the right granulation block is set to be vertical. The initial gap e0 between the left and right granulation blocks is equal to the twin screw gap e1. The rotation centers of the left and right pelletizing blocks are set as O1 and O2 respectively. The center distance calculation formula of the left and right pelletizing blocks is: （1） Where: d1 is the inner diameter of the twin screw thread (mm), D1 is the outer diameter of the twin screw thread (mm), e1 is the twin screw gap (mm), e0 is the initial gap between the left and right pelletizing blocks (mm), and W is the maximum span of the two transition arcs (mm); From formula 1, we can get W = d1 (2); The calculation formula of transition arc diameter D2 is: （3）； Where: W is the maximum span of the two transition arcs (mm), B is the chord length of the concentric arc on one side (mm), and D1 is the outer diameter of the twin screw thread (mm); The ∞ inner cavity is two inner cylindrical cavities generated by rotating with O1 and O2 as the center and D1+2e1 as the diameter.

2. A disc-shaped granulation block according to claim 1, characterized in that: The thickness h1 of the left granulating block body is set to 2-10 mm, the height h2 of the circular boss is set to 0.3-1.0 mm; the outer diameter of the circular boss is equal to the inner diameter d1 of the twin-screw thread.

3. A method for analyzing dynamic meshing clearance of a disc-shaped granulating block according to claim 1 or 2, characterized in that: The steps include: S1. Set the initial position of the left granulating block to be horizontal, and the right granulating block to be in 90° meshing phase with the left granulating block. Determine the initial gap between the left and right granulating blocks as e0=e1; where: e1 is the twin-screw gap; S2. Determine the calculation formula for the central angle θ1 of the concentric arc based on the concentric arc diameter D1 and the concentric arc chord length B; Based on the transition arc diameter D2 and the maximum span W of the two transition arcs, determine the calculation formula for the distance between the concentric arcs and the transition arc centers O3 and O4 respectively; S3, taking the left granulation block as the analysis object, establishing the X O1Y1 rectangular coordinates with the rotation center O1 of the left granulation block, X is collinear with the center line connecting the two concentric arcs of the left granulation block, Y1 is collinear with the center line connecting the two transition arcs of the left granulation block, and the outer contour of the left granulation block is divided into eight arcs by the four endpoints M1, N1, E1, F1 of the two concentric arcs, the midpoints A1 and B1 of the two concentric arcs, and the midpoints C1 and D1 of the two transition arcs. The eight arcs are A1M1, M1C1, C1E1, E1B1, B1F1, F1D1, D1N1, and N1A1 in counterclockwise order starting from the first quadrant; S4. Determine the range of the central angles of the eight arcs in step S3 based on the central angle θ1 of the concentric arcs, and the calculation formula for the rotation radius R1 of the eight arcs around O1: Arc segments A1M1, E1B1, B1F1, and N1A1 are all concentric arc segments. The rotation radius of any point P1 on the four concentric arc segments around O1 is the radius of the concentric arc = D1 / 2; Take any point P1 on the arc segments M1C1 and C1E1, and draw lines connecting P1, O1, and O3 to form a triangle △P1O1O3. Use the triangle cosine theorem to determine the calculation formula for P1O1. P1O1 is the rotation radius R1 of any point P1 on the arc segments M1C1 and C1E1 rotating around O1, thus determining the calculation formula for the rotation radius R1. Take any point P1 on the arc segments F1D1 and D1N1, and draw lines connecting P1, O1, and O4 to form a triangle △P1O1O4. Use the triangle cosine theorem to determine the calculation formula for P1O1. P1O1 is the rotation radius R1 of any point P1 on the arc segments F1D1 and D1N1 rotating around O1, thus determining the calculation formula for the rotation radius R1. S5, set up XO2Y2 rectangular coordinates with right granulation block rotation center O2, X is collinear with the center line of two transition circular arcs of right granulation block, Y2 is collinear with the center line of two concentric circular arcs of right granulation block, with four endpoints M2, N2, E2, F2, the midpoint D2, C2 of two transition circular arcs and the midpoint A2, B2 of two concentric circular arcs, the right granulation block outer contour is divided into eight sections of circular arcs, these eight sections of circular arcs are D2N2, N2A2, A2M2, M2C2, C2E2, E2B2, B2F2, F2D2 in counterclockwise order from the first quadrant, adopt the same processing approach of step S4, determine the central angle range of these eight sections of circular arcs and the rotation radius R2 computing formula of these eight sections of circular arcs around O2; S6, the left granulation block and the right granulation block rotate at the same speed and in the same direction at the same time, so that the meshing phase of the left granulation block and the right granulation block is always 90 degrees. During the rotation operation, the sweep points of the outer contours of the left granulation block and the right granulation block on the X axis are set to S1 and S2 respectively, and the distance S between the sweep points S1 and S2 is set to 12 As the dynamic gap between the two granulating blocks, the dynamic gap S of the two granulating blocks on the X axis is determined when the left granulating block and the right granulating block rotate at any angle θ at the same time according to the calculation formula of the rotation radius R1 and R2 corresponding to the phase position of the points S1 and S2 on the outer contour. 12 Calculation formula; S7. Determine the calculation formula of the relationship between the arbitrary rotation angle θ of the granulating block and the working time t, and determine the calculation formula of the relationship between the change period t1 of the dynamic gap S12 and the rotation speed n of the granulating block.

4. The method for analyzing dynamic meshing clearance of a disc-shaped granulating block according to claim 3, wherein: The calculation formula of θ1 in step S2 is: (4)； Where: D1 is the outer diameter of the twin screw thread (mm), B is the chord length of the concentric arc (mm).

5. The dynamic meshing clearance analysis method according to claim 3, characterized in that: The calculation formula of O1O3 or O1O4 in step S2 is: （5）； Where: D2 is the diameter of the transition arc (mm); W is the maximum span between the two transition arcs (mm).

6. The method for analyzing dynamic meshing clearance of a disc-shaped granulating block according to claim 3, wherein: In the calculation formula of the rotation radius of the eight arcs A1M1, M1C1, C1E1, E1B1, B1F1, F1D1, D1N1, and N1A1 around the center O1 in step S4, the calculation formula of the rotation radius of M1C1 and C1E1, E1B1 and B1F1, and F1D1 and D1N1 are consistent, and the calculation formula of the eight arcs A1M1, M1C1, C1E1, E1B1, B1F1, F1D1, D1N1, and N1A1 is adjusted to the calculation formula of the five arcs A1M1, M1E1, E1F1, F1N1, and N1A1, which are set to R 11 、R 12 、R 13 、R 14 、R 15 , the calculation formula (6) is as follows: ； Where: θ is the phase angle of any point P1 on each arc segment (°), θ1 is the central angle of the single-sided concentric arc (°), D1 is the outer diameter of the twin-screw thread (mm), D2 is the diameter of the transition arc (mm), and O1O3 is the distance between the centers of the concentric arc and the transition arc (mm).

7. The method for analyzing dynamic meshing clearance of a disc-shaped granulating block according to claim 3, characterized in that: In the step S5, among the eight arcs D2N2, N2A2, A2M2, M2C2, C2E2, E2B2, B2F2, and F2D2, the calculation formulas for the rotation radii of N2A2 and A2M2, M2C2 and C2E2, and E2B2 and B2F2 around the center O2 are consistent, and the calculation formulas for the eight arcs D2N2, N2A2, A2M2, M2C2, C2E2, E2B2, B2F2, and F2D2 are adjusted to the calculation formulas for the five arcs D2N2, N2M2, M2E2, E2F2, and F2D2, which are set to R 21 、R 22 、R 23 、R 24 、R 25 , the calculation formula (7) is as follows: ； Where: θ is the phase angle (°) of any point P1 on each arc segment, θ1 is the central angle of the concentric arc (°), D1 is the outer diameter of the twin screw thread (mm), D2 is the diameter of the transition arc (mm), and O1O3 is the distance between the centers of the concentric arc and the transition arc (mm).

8. The method for analyzing dynamic meshing clearance of a disc-shaped granulating block according to claim 7, characterized in that: The dynamic gap in step S6 , by substituting the calculation formulas (6) and (7), we can obtain the 9-segment dynamic gap S when the left and right material blocks rotate one circle. 12 The calculation formula (8) is as follows: 。 9. The method for analyzing dynamic meshing clearance of a disc-shaped granulating block according to claim 3, wherein: In step S7, the pelletizing block rotates at any angle (10); In formula (10): is the rotation speed of the pelletizing block (r / min), is the working time (s); The working time t1 of two granulating blocks rotating 360° is the dynamic gap S. 12 The change cycle of the dynamic gap S 12 The calculation formula of the change period t1 is as follows: (11)； Where n is the rotation speed of the pelletizing block (r / min).

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