A dry granulator equipment and process

Abstract

The present invention relates to the technical field of dry granulation, and specifically to a dry granulator device and a process thereof, wherein the dry granulator device comprises a hopper and two granulator rollers inserted in parallel in the hopper, wherein the two granulator rollers rotate in opposite directions to drive the material to move from top to bottom, wherein a plurality of arc-shaped convex strips are arranged on the outer peripheral wall of each granulator roller, wherein the plurality of convex strips together form an annular wavy structure, wherein the convex strips extend along the axial direction of the granulator roller, and two extrusion groove groups are arranged on both sides of each convex strip, wherein each extrusion groove group comprises a plurality of extrusion grooves arranged at equal intervals and extending along the extension direction of the convex strip. During use, the material is firstly put into between the two granulator rollers through the top of the hopper, and then the two granulator rollers are driven to rotate in opposite directions, and as the granulator rollers rotate, the extrusion grooves on the two granulator rollers first approach each other and then move away from each other to extrude the material.

Description

Technical Field

[0001] The invention relates to the technical field of dry granulation, in particular to dry granulator equipment and a process thereof. Background Art

[0002] Most polymers must be mixed and then granulated before being made into final products to become marketable raw materials; existing granulation methods mainly include stirring granulation, boiling granulation, fluidized bed granulation and dry granulation. Among them, dry granulation is a process technology for processing powdered materials into granular materials. Its main principle is to compress powdered materials with low water content into sheets or blocks through mechanical extrusion, and then through the steps of crushing, granulation and screening, the sheet and block materials are turned into granular materials that meet the use requirements.

[0003] In the related art, for example, a reference document with authorization announcement number CN110652935B discloses a double-roller extrusion granulator that can change the shape of particles. When the double-roller extrusion granulator that can change the shape of particles is in use, the semicircular shells on the two extrusion rollers are in contact with each other, and the first extrusion grooves and the second extrusion grooves of various shapes are used to extrude materials of different shapes, thereby forming round, rectangular and elliptical material particles.

[0004] Although the above-mentioned double-roll extrusion granulator that can change the particle shape has improved the convenience of making materials of different shapes to a certain extent, it is found in the actual process of making round particle materials that the round particle materials extruded have problems such as poor roundness, adhesion between particles, and uneven density, which makes it easy to rework and affects production efficiency. Summary of the invention

[0005] Based on this, it is necessary to provide a dry granulator equipment and process to address the problems of poor granule forming quality and low production efficiency in the current dry granulation process.

[0006] The above purpose is achieved through the following technical solutions:

[0007] A dry granulator comprises a hopper, in which two granulating rollers are inserted horizontally and in parallel, the two granulating rollers are tangent to each other and can rotate on their own, and the rotation directions are opposite to each other, so as to drive the material to move from top to bottom, a plurality of arc-shaped convex strips are evenly arranged on the circumferential side wall of each granulating roller, and the plurality of convex strips together form an annular wavy structure, the convex strips extend along the axial direction of the granulating roller, and an extrusion groove group is arranged on the two arc side walls of each convex strip, and each extrusion groove group includes a plurality of extrusion grooves arranged at equal intervals and extending along the extension direction of the convex strip; when in use, the convex strip on one of the granulating rollers and the groove portion between two adjacent convex strips on the other granulating roller are keyed.

[0008] Furthermore, the convex strips are arranged obliquely, and the convex strips on the two granulating rollers have opposite inclination directions and equal inclination angles.

[0009] Furthermore, a dividing mechanism is inserted inside the hopper, and the dividing mechanism is arranged below the granulating roller and is configured to divide the spherical material after being extruded and formed by the two granulating rollers.

[0010] Furthermore, the dividing mechanism includes two horizontally and parallel rotating rollers, both of which can rotate on their own and have opposite rotation directions, and a plurality of dividing plates are vertically and evenly arranged along the circumference on the outer peripheral wall of each rotating roller, and the dividing plates extend along the axial direction of the rotating roller, and the dividing plates on the two rotating rollers are partially overlapped on the side close to each other.

[0011] Furthermore, the dry granulator equipment further comprises a driving mechanism, and the driving mechanism is configured to provide driving force for the two granulating rollers and the two rotating rollers to rotate respectively.

[0012] Furthermore, the dry granulator equipment further comprises a screening mechanism, which is disposed at the outlet of the hopper and is configured to screen the material divided by the dividing mechanism.

[0013] Furthermore, the screening mechanism includes an inclined screen; the bottom of the hopper is arranged in an eight-shaped structure, and the large end opening is arranged upward, and the small end opening and the higher end of the screen in the vertical direction are arranged correspondingly.

[0014] Furthermore, the extrusion grooves in the two extrusion groove groups on the same convex strip are arranged correspondingly.

[0015] The present invention also provides a dry granulation process, using the above-mentioned dry granulator equipment, the dry granulation process comprises the following steps:

[0016] S1. Put the material between two granulating rollers through the top of the hopper;

[0017] S2, driving the two granulating rollers to rotate in opposite directions to squeeze the material.

[0018] The beneficial effects of the present invention are:

[0019] The invention relates to a dry granulator and a process thereof. The dry granulator process comprises the following steps: firstly, the material is put into between two granulator rollers through the top of a hopper when the dry granulator is in use, and then the two granulator rollers are driven to rotate in opposite directions. With the rotation of the granulator rollers, the extrusion grooves on the two granulator rollers are first approached to each other and then moved away from each other to extrude the material. In the process of extruding the material, the structure of the convex strips makes the extrusion force on the powdery material more balanced and concentrated, thereby facilitating the improvement of the roundness and density of the spherical material after forming.

[0020] Furthermore, by setting the convex strips to be inclined, on the one hand, it helps to ensure the stability of the granulating roller during rotation, and on the other hand, the spherical material after extrusion can not only form a strip structure, but also can leak out one by one between the two granulating rollers, which is conducive to improving the simplicity of subsequent segmentation. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A schematic diagram of the three-dimensional structure of a dry granulator device provided in one embodiment of the present invention;

[0022] Figure 2 A schematic cross-sectional view of a dry granulator device according to an embodiment of the present invention;

[0023] Figure 3 A schematic diagram of the three-dimensional structure of two granulating rollers of a dry granulator device provided by one embodiment of the present invention when assembled;

[0024] Figure 4 A schematic diagram of the three-dimensional structure of a granulating roller of a dry granulating machine device provided in one embodiment of the present invention;

[0025] Figure 5 for Figure 4 A schematic diagram of the partially enlarged structure at center A;

[0026] Figure 6 The use status of two granulating rollers of the dry granulator device provided in one embodiment of the present invention Figure 1 ;

[0027] Figure 7 The use status of two granulating rollers of the dry granulator device provided in one embodiment of the present invention Figure 2 .

[0028] in:

[0029] 1. Frame; 11. Hopper; 111. Feed inlet; 112. Discharge outlet;

[0030] 2. Granulating roller; 21. Raised strip; 211. Extrusion groove;

[0031] 3. Splitting mechanism; 31. Rotating roller; 32. Splitting plate;

[0032] 4. Driving mechanism; 41. Driving motor; 42. Belt; 43. Pulley 2; 44. Tensioning wheel;

[0033] 5. Screening mechanism; 51. Screen. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0035] The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in this application, unless otherwise specified, include direct and indirect connections (couplings). In the description of the present invention, it should be understood that the orientation or position relationship indicated by the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc. are based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0036] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0037] like Figures 1 to 7As shown, a dry granulator device provided by an embodiment of the present invention is used for pelletizing, and is configured to include a hopper 11, in which two granulating rollers 2 are horizontally and parallelly inserted, the two granulating rollers 2 are tangential and can rotate, and the rotation directions are opposite, so as to drive the material to move from top to bottom, and a plurality of arc-shaped convex strips 21 are evenly arranged on the circumferential side wall of each granulating roller 2, and the plurality of convex strips 21 together form an annular wavy structure, the convex strips 21 extend along the axial direction of the granulating roller 2, and an extrusion groove group is arranged on the two arc side walls of each convex strip 21, and each extrusion groove group includes a plurality of extrusion grooves 211 arranged at equal intervals and extending along the extension direction of the convex strip 21; when in use, the convex strip 21 on one granulating roller 2 and the groove portion between two adjacent convex strips 21 on the other granulating roller 2 are keyed.

[0038] Specifically in this embodiment, Figure 1 As shown, the hopper 11 is configured as a box structure with both the top and the bottom open, and the top open of the box is a feed port 111, and the bottom open of the box is a discharge port 112, wherein the feed port 111 is used to put materials into the hopper 11, and the discharge port 112 is used to discharge the materials in the box; when installing, the granulating roller 2 is configured such that the front end is vertically inserted on the inner plate surface of the front side plate of the hopper 11, and the rear end is vertically inserted on the inner plate surface of the rear side plate of the hopper 11; as shown Figure 5 As shown, the two extrusion groove groups are respectively arranged on the left and right arc walls of the convex strip 21, and the extrusion grooves 211 in the two extrusion groove groups on the same convex strip 21 are arranged correspondingly, as shown in FIG. Figure 6 As shown, the extrusion groove 211 is configured as a hemispherical structure, so that the two corresponding extrusion grooves 211 on the two granulation rollers 2 can extrude spherical granular materials when they cooperate.

[0039] More specifically, in order to facilitate the installation of the hopper 11, the dry granulator equipment is configured to also include a frame 1, such as Figure 1 As shown, the frame 1 is configured to have a bottom plate and two vertical plates vertically arranged on the top of the bottom plate. The hopper 11 is located between the two vertical plates when installed and is supported by the tops of the two vertical plates.

[0040] By directly setting the extrusion groove 211 on the granulation roller 2, during the process of spherical material forming, since its main extrusion surface is still an arc surface, the powdered material in the extrusion groove 211 is easy to move upward along the extrusion surface, which causes the spherical material after forming to have problems of poor roundness and uneven density.

[0041] During use, firstly, powdered materials are continuously added into the hopper 11 through the feed port 111, and at the same time, the two granulating rollers 2 are driven to rotate in opposite directions. During the rotation of the granulating rollers 2, the tangent positions of the two granulating rollers 2 are Figure 6 and Figure 7The states shown switch continuously between Figure 6 Point b in the figure is the tangent point of the two granulating rollers 2. Figure 7 Point c in the figure is the tangent point of the two granulating rollers 2, and the granulating roller 2 on the left rotates in a clockwise direction, and the granulating roller 2 on the right rotates in a counterclockwise direction to drive the material to move from top to bottom; above point b, the distance between the two granulating rollers 2 gradually narrows from top to bottom, and the path is S-shaped, below point b, the distance between the two granulating rollers 2 gradually narrows from bottom to top, and the path is S-shaped, above point c, the distance between the two granulating rollers 2 gradually narrows from top to bottom, and the path is S-shaped, Below point c, the distance between the two granulating rollers 2 gradually narrows from bottom to top, and the path is S-shaped, so that in the process of spherical material forming, compared with the method of directly setting the extrusion groove 211 on the granulating roller 2, the method of setting the extrusion groove 211 on the convex strip 21 is adopted. The narrowed and S-shaped path can not only hinder the powdered material from moving upward and downward, but also make the extrusion force on the powdered material more balanced and concentrated, thereby helping to improve the roundness and density of the spherical material after forming.

[0042] And by setting appropriate parameters, when the tangential position of the two granulating rollers 2 is as follows Figure 6 As shown, the convex strip 21 on the left granulation roller 2 at point b can be completely bonded to the groove portion between two adjacent convex strips 21 on the right granulation roller 2, so that the spherical material of the current layer and the spherical material of the previous layer can be cut apart, so that each layer of the spherical material forms a strip structure extending along the axial direction of the granulation roller 2, thereby facilitating the convenience of subsequent segmentation.

[0043] In some embodiments, Figure 6As shown in the figure, when the spherical material is formed in the two extrusion grooves 211 above point b, the granulating roller 2 on the left side is subjected to a downward force to the left through the extrusion groove 211, and can be decomposed into a horizontal left component and a vertical downward component. Under the action of the vertical downward component, the granulating roller 2 has a tendency to rotate in the clockwise direction. At this time, the power consumed by driving the granulating roller 2 will decrease. The granulating roller 2 on the right side is subjected to an upward force to the right through the extrusion groove 211, and can be decomposed into a horizontal right component and a vertical upward component. Under the action of the vertical upward component, the granulating roller 2 has a tendency to rotate in the clockwise direction. At this time, the power consumed by driving the granulating roller 2 will increase. When the spherical material is formed in the two extrusion grooves 211 below point b, the granulating roller 2 on the left side is subjected to a downward force to the left through the extrusion groove 211. The granulating roller 2 has a tendency to rotate counterclockwise under the action of the vertically upward force. At this time, the power consumed by driving the granulating roller 2 will increase. The granulating roller 2 on the right side is subjected to a downward right force through the extrusion groove 211, which can be decomposed into a horizontally rightward force and a vertically downward force. The granulating roller 2 has a tendency to rotate counterclockwise under the action of the vertically downward force. At this time, the power consumed by driving the granulating roller 2 will decrease, resulting in the two granulating rollers 2 consuming power fluctuating during rotation, which is likely to affect the stability of the extrusion work. To solve this problem, the convex strips 21 are arranged to be inclined, and the inclination directions of the convex strips 21 on the two granulating rollers 2 are opposite and the inclination angles are equal.

[0044] Specifically in this embodiment, Figure 3 As shown, taking the granulation roller 2 on the left side as an example, the convex strip 21 is arranged to extend backward along the axial direction of the granulation roller 2 and to extend in a clockwise direction along the circumference of the granulation roller 2; similarly, the convex strip 21 on the granulation roller 2 on the right side is arranged to extend backward along the axial direction of the granulation roller 2 and to extend in a counterclockwise direction along the circumference of the granulation roller 2.

[0045] During use, since the convex strip 21 is inclined, on the horizontal plane of the tangential position of the two granulating rollers 2, the spherical material can be simultaneously formed in multiple pairs of extrusion grooves 211 along the axial direction of the granulating roller 2, and the multiple pairs of extrusion grooves 211 are alternately arranged on the left and right arc side walls of the convex strip 21, so that the granulating roller 2 on the left can be simultaneously subjected to multiple forces to the upper left and multiple forces to the lower left, and the components of the forces along the vertical direction can be offset, thereby avoiding affecting the power consumption of the granulating roller 2 on the left during the rotation; similarly, the granulating roller 2 on the right can be simultaneously subjected to multiple forces to the upper right and multiple forces to the lower right, and the components of the forces along the vertical direction can be offset, thereby avoiding affecting the power consumption of the granulating roller 2 on the left during the rotation.

[0046] And since the convex strips 21 are inclined, and the convex strips 21 on the left granulating roller 2 at point b can be completely bonded to the groove part between two adjacent convex strips 21 on the right granulating roller 2, the spherical materials of the current layer are inclined and leak out one by one from between the two granulating rollers 2, which is beneficial to further improve the simplicity during subsequent segmentation.

[0047] In some other embodiments, a segmentation mechanism 3 is further inserted inside the hopper 11. The segmentation mechanism 3 is arranged below the granulating rollers 2 and configured to be able to segment the spherical materials formed by extrusion of the two granulating rollers 2, so as to reduce the trouble during subsequent segmentation and improve the production efficiency of the spherical materials.

[0048] In a further embodiment, the segmentation mechanism 3 is arranged to include two horizontally and parallelly arranged rotating rollers 31. Both of the two rotating rollers 31 can rotate self - sufficiently and have opposite rotating directions. A plurality of segmentation plates 32 are vertically and circumferentially arranged on the outer peripheral wall of each rotating roller 31 at equal intervals. The segmentation plates 32 extend along the axial direction of the rotating roller 31, and the segmentation plates 32 on the two rotating rollers 31 are partially overlapped on the side close to each other.

[0049] Specifically in this embodiment, as Figure 2 shown, the segmentation plates 32 on the two rotating rollers 31 will overlap when rotating to the inner side, and the overlapping part is below the tangency of the two granulating rollers 2. Thus, when the spherical materials fall under the action of gravity, they can just fall near this overlapping part and are scattered by the segmentation plates 32 as the two rotating rollers 31 rotate.

[0050] In a further embodiment, the dry granulator equipment is also provided with a driving mechanism 4. The driving mechanism 4 is configured to be able to provide the driving force for the self - rotation of the two granulating rollers 2 and the two rotating rollers 31 respectively.

[0051] Specifically in this embodiment, as Figure 1 shown, the driving mechanism 4 is arranged to include a driving motor 41, a belt 42, a second pulley 43 and a tensioning pulley 44. The driving motor 41 is installed on the frame 1, and a first pulley is fixedly sleeved on the motor shaft of the driving motor 41; the second pulley 43 is fixedly sleeved on the right granulating roller 2; the tensioning pulley 44 is fixedly sleeved on the right rotating roller 31; one end of the belt 42 is drivingly sleeved on the first pulley, and the other end is drivingly sleeved on the second pulley 43 and is simultaneously tensioned from the outside by the tensioning pulley 44 to transmit the rotation of the driving motor 41 to the right granulating roller 2 and the right rotating roller 31 at the same time; for the convenience of installing the driving motor 41, a "U - shaped" mounting seat is arranged on the top of the bottom plate of the frame 1, and the driving motor 41 is fixedly connected to the top of the mounting seat by bolts during installation.

[0052] More specifically, in order to facilitate the rotation of the two granulating rollers 2 and the two rotating rollers 31 in opposite directions, a gear one is fixedly sleeved on one of the granulating rollers 2, and a gear two that can mesh with the gear one is fixedly sleeved on the other granulating roller 2; a gear three is fixedly sleeved on one of the rotating rollers 31, and a gear four that can mesh with the gear three is fixedly sleeved on the other rotating roller 31.

[0053] During use, the drive motor 41 is started, and the drive motor 41 synchronously drives the pulley 1 to rotate, and the pulley 1 synchronously drives the tensioning wheel 44 and the pulley 2 43 to rotate through the belt 42, and the pulley 2 43 drives the corresponding granulating roller 2 to rotate, and the granulating roller 2 drives the other granulating roller 2 to rotate synchronously in the opposite direction through the engagement between the gear 1 and the gear 2; the tensioning wheel 44 drives the corresponding rotating roller 31 to rotate, and the rotating roller 31 drives the other rotating roller 31 to rotate synchronously in the opposite direction through the engagement between the gear 3 and the gear 4.

[0054] In other embodiments, the belt 42 can be replaced by a transmission chain, the pulley 1 can be replaced by a sprocket 1, and the pulley 2 43 can be replaced by a sprocket 2; and another driving motor 41 can be separately provided to replace the tensioning wheel 44, so as to still provide driving force for the two granulating rollers 2 and the two rotating rollers 31 to rotate in opposite directions.

[0055] In other embodiments, the dry granulator equipment is configured to also include a screening mechanism 5, which is disposed at the outlet of the hopper 11 and is configured to screen the material divided by the dividing mechanism 3, thereby timely separating the spherical material from the flake material, thereby reducing the trouble of subsequent screening and improving the production efficiency of the spherical material.

[0056] In a further embodiment, the screening mechanism 5 is configured to include an inclined screen 51; the bottom of the hopper 11 is configured to be an eight-shaped structure, with the large end opening facing upward, and the small end opening and the higher end of the screen 51 in the vertical direction are correspondingly configured.

[0057] Specifically in this embodiment, Figure 1 and Figure 2 As shown, the screen 51 is arranged to extend obliquely in the upper right direction and is fixedly arranged between the two vertical plates; the bottom of the hopper 11 is arranged as an eight-shaped box structure, and the discharge port 112 is arranged on the right; during use, the materials divided by the dividing mechanism 3 are uniformly discharged from the discharge port 112 under the guidance of the bottom of the hopper 11, and freely fall to the top right side of the screen 51. Since the screen 51 is arranged obliquely, the material can move downward along the screen 51 under the action of gravity. During the movement of the material, the spherical material can pass through the screen 51, and the sheet material cannot pass through the screen 51, so that the spherical material and the sheet material can be screened apart.

[0058] In combination with the above embodiments, the use principle and working process of the embodiments of the present invention are as follows:

[0059] During use, first, powdered materials are continuously added to the hopper 11 through the feed port 111, and the drive motor 41 is started at the same time. The drive motor 41 synchronously drives the pulley 1 to rotate, and the pulley 1 synchronously drives the tensioning wheel 44 and the pulley 2 43 to rotate through the belt 42, and the pulley 2 43 drives the corresponding granulating roller 2 to rotate, and the granulating roller 2 drives another granulating roller 2 to rotate synchronously in the opposite direction through the engagement between gear 1 and gear 2, and the tensioning wheel 44 drives the corresponding rotating roller 31 to rotate, and the rotating roller 31 drives another rotating roller 31 to rotate synchronously in the opposite direction through the engagement between gear 3 and gear 4.

[0060] During the rotation of the granulating roller 2, the tangent position of the two granulating rollers 2 is Figure 6 and Figure 7 The granulating roller 2 on the left side rotates in a clockwise direction, and the granulating roller 2 on the right side rotates in a counterclockwise direction. The convex strips 21 on one of the granulating rollers 2 are continuously bonded with the grooves between the two adjacent convex strips 21 on the other granulating roller 2 to extrude the powdery material into spherical material. Since the convex strips 21 are inclined, and the convex strips 21 on the left granulating roller 2 at point b can be completely bonded with the grooves between the two adjacent convex strips 21 on the right granulating roller 2, the spherical material of the current layer is inclined, and is squeezed out one by one from the two granulating rollers. The spherical materials and the flake materials are separated by the dividing plates 32. The spherical materials and the flake materials are separated by the dividing plates 32. The spherical materials and the flake materials are separated by the dividing plates 32. The spherical materials and the flake materials are separated by the dividing plates 32.

[0061] An embodiment of the present invention further provides a dry granulation process, which uses the above-mentioned dry granulator equipment and is configured to include the following steps:

[0062] S1, putting the material into between two granulation rollers 2 through the top of the hopper 11;

[0063] Specifically, powdered materials are continuously added into the hopper 11 through the feed port 111 , and the powdered materials fall between the two granulating rollers 2 under the action of gravity.

[0064] S2, drives the two granulating rollers 2 to rotate in opposite directions to squeeze the materials.

[0065] Specifically, the driving mechanism 4 drives the two granulating rollers 2 to rotate synchronously in opposite directions, and the convex strips 21 on one granulating roller 2 are continuously bonded with the grooves between two adjacent convex strips 21 on the other granulating roller 2 to extrude the powdery material into spherical material.

[0066] The technical features of the above embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0067] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A dry granulator device, characterized in that: It comprises a hopper, in which two granulating rollers are inserted horizontally and in parallel, the two granulating rollers are tangent to each other and can rotate on their own, and the rotation directions are opposite, so as to drive the material to move from top to bottom, a plurality of arc-shaped convex strips are evenly arranged on the circumferential side wall of each granulating roller, and the plurality of convex strips together form an annular wavy structure, the convex strips extend along the axial direction of the granulating roller, and an extrusion groove group is arranged on the two arc side walls of each convex strip, and each extrusion groove group includes a plurality of extrusion grooves arranged at equal intervals and extending along the extension direction of the convex strip; when in use, the convex strip on one of the granulating rollers and the groove portion between two adjacent convex strips on the other granulating roller are bonded; The convex strips are arranged obliquely, and the convex strips on the two granulating rollers are inclined in opposite directions and at equal angles, so as to avoid affecting the power consumption of the granulating rollers during the rotation process.

2. The dry granulator equipment according to claim 1, characterized in that: A dividing mechanism is also inserted inside the hopper, and the dividing mechanism is arranged below the granulating roller and is configured to divide the spherical material after being extruded and formed by the two granulating rollers.

3. The dry granulator equipment according to claim 2, characterized in that: The dividing mechanism includes two rotating rollers arranged horizontally and in parallel, both of which can rotate on their own and in opposite directions, and a plurality of dividing plates are arranged vertically and evenly along the circumference on the outer peripheral wall of each rotating roller, and the dividing plates extend along the axial direction of the rotating roller, and the dividing plates on the two rotating rollers are partially overlapped on the side close to each other.

4. The dry granulator equipment according to claim 3, characterized in that: The dry granulator equipment further comprises a driving mechanism, which is configured to provide driving force for the two granulating rollers and the two rotating rollers to rotate respectively.

5. The dry granulator equipment according to claim 2, characterized in that: The dry granulator equipment further comprises a screening mechanism, which is arranged at the outlet of the hopper and is configured to screen the material divided by the dividing mechanism.

6. The dry granulator equipment according to claim 5, characterized in that: The screening mechanism comprises an inclined screen; the bottom of the hopper is arranged in an eight-shaped structure, with the large end opening arranged upward, and the small end opening and the higher end of the screen in the vertical direction are arranged correspondingly.

7. The dry granulator equipment according to claim 1, characterized in that: The extrusion grooves in the two extrusion groove groups on the same convex strip are arranged correspondingly.

8. A dry granulation process, characterized in that: Using the dry granulator equipment according to any one of claims 1 to 7, the dry granulation process comprises the following steps: S1. Put the material between two granulating rollers through the top of the hopper; S2, driving the two granulating rollers to rotate in opposite directions to squeeze the material.

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