Split ring die feed pellet forming assembly and forming method thereof

Abstract

The present invention discloses a split-type ring die feed pellet forming assembly and a forming method thereof, wherein the forming method comprises the following steps: circular motion is performed by the bottom of the ring die to achieve wall-adhering motion of the feed raw material on the die sleeve to form a target material layer; pressure is applied to the material layer on the die sleeve to make it pass through the material holes on the die sleeve to obtain material strips; and the material strips are cut to obtain target particles. The split-type ring die feed pellet forming assembly of the present invention can realize the above-mentioned forming method. The ring die feed pellet forming assembly is achieved by separating the side wall and the bottom plate of the ring die. The bottom plate rotates rapidly to achieve rapid and sufficient wall adhesion of feed powder. The speed of the die sleeve is used as a control component for the efficiency of pressing particles. The cooperation of the two can achieve high efficiency and high quality of ring die pelletizing while maintaining work efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of pellet feed processing, and in particular to a split-type ring die feed pellet forming component and a forming method thereof. Background Art

[0002] In the process of forming feed pellets, most of them are extrusion processes. Extrusion is a dry granulation process that uses pressure to agglomerate solid materials. For pellet feed, there are two methods, flat die extrusion granulation and ring die extrusion granulation.

[0003] The material produced by flat die extrusion granulation is squeezed through the material holes of the flat die plate by the roller on one side, and then cut by the scraper on the other side of the die plate to obtain feed pellets.

[0004] Ring die extrusion granulation involves feeding material into a rotating feed basin. Centrifugal force forms a uniform annular layer on the inner wall of the ring die. This layer is then squeezed through rollers and extruded from holes in the inner wall of the ring die. A cutter then cuts the material into pellets. During the ring die extrusion granulation process, high-speed ring dies produce high output efficiency but soft pellets. Low-speed ring dies produce a thicker layer in the extrusion zone, resulting in better pellet quality but lower output efficiency. Summary of the Invention

[0005] In order to balance the molding output efficiency and quality corresponding to different ring die speeds, the present invention proposes a split ring die feed pellet molding assembly and a molding method thereof. The ring die is designed to be split to improve the processing efficiency and quality of pellet feed molding.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] The split-type ring die feed pellet forming assembly includes a pelletizing cylinder located at the bottom and a feed ring located at the top. The feed ring is used for continuous feeding of the pelletizing cylinder, and the pelletizing cylinder is used for pelleting feed raw materials.

[0008] Specifically, the pelletizing drum is equipped with a coaxial ring die. The ring die comprises a die sleeve as a sidewall and a centrifugal bottom plate for bottom sealing. The die sleeve is provided with a feed hole pointing toward the axis. A pressure roller is installed within the ring die, which moves relative to the die sleeve. The pressure roller is used to squeeze the material layer on the die sleeve, forcing it out of the die sleeve's feed hole to form material strands. A cutter is located outside the die sleeve and is used to cut the material strands into feed pellets, which are then discharged from the bottom outlet of the pelletizing drum.

[0009] In the present invention, the die sleeve and centrifugal base are respectively rotatably connected to the granulation drum, and the die sleeve and centrifugal base are rotatably sealed. During granulation, when the tempered feed powder enters the ring die, the feed powder first contacts the centrifugal base. Under the rotation of the centrifugal base, the feed powder produces a centrifugal effect, accumulating toward the edge of the centrifugal base and extending toward the inner wall of the die sleeve, forming a material layer on the inner wall of the die sleeve. In the present invention, the rotation speed of the centrifugal base is maintained greater than the rotation speed of the die sleeve. The high-speed rotation of the centrifugal base can accelerate the accumulation speed of the feed powder on the inner wall of the die sleeve, forming a thicker material layer on the inner wall of the die sleeve. The die sleeve can also rotate rapidly, increasing the speed of the die sleeve relative to the pressure roller, thereby improving granulation efficiency.

[0010] Furthermore, a vibration chamber is provided inside the centrifugal bottom plate, and a metal ball is provided inside the vibration chamber. The metal ball is connected to the cavity wall of the vibration chamber in the axial direction of the centrifugal bottom plate through an elastic member. Magnetic blocks are provided on the magnetic plate, and the magnetic blocks are spaced around the center of the magnetic plate. The magnetic plate is fixedly connected to the granulation cylinder and is located below the centrifugal bottom plate. In the present invention, the metal ball can be adsorbed by the magnetic blocks on the magnetic plate. When the centrifugal bottom plate rotates, the metal ball is intermittently adsorbed, so that the metal ball can vibrate inside the vibration chamber, thereby reducing the adhesion of feed powder on the upper surface of the centrifugal bottom plate, facilitating rapid centrifugation of the feed powder, and helping the feed powder to form a material layer in the die sleeve.

[0011] Furthermore, the granulating drum is provided with a coaxial central rotating shaft, the upper end of which is connected to a forming motor that drives the central rotating shaft in rotation. A driving gear is sleeved on the central rotating shaft. A support frame is also provided within the granulating drum, rotatably connected to the inner wall of the granulating drum. The support frame is fixedly connected to a ring gear and a die sleeve. An intermediate gear is provided between the ring gear and the driving gear, meshing with the ring gear and the driving gear, respectively. A pressure roller within the die sleeve and the intermediate gear are both rotatably connected to the granulating drum via a fixed shaft.

[0012] In the present invention, the central rotating shaft drives the driving gear to rotate, which in turn causes the intermediate gear and the ring gear to rotate separately. The central rotating shaft drives the centrifugal base plate, the intermediate gear drives the pressure roller, and the ring gear drives the die sleeve. The centrifugal base plate and the die sleeve rotate in opposite directions, while the die sleeve rotates in the same direction as the pressure roller, allowing the pressure rollers to exert a pressing force on the material layer of the die sleeve. In the present invention, the pressure roller is fixed in position, while the die sleeve is movable relative to the pressure roller.

[0013] In the above process, the rotation direction of the centrifugal bottom plate is opposite to that of the mold sleeve. When the rotation directions of the centrifugal bottom plate and the mold sleeve are opposite, the feed powder accumulated on the edge of the centrifugal bottom plate is affected by friction in two directions, and the fluidity of the feed powder is better, which is conducive to extending toward the inner wall of the mold sleeve.

[0014] Preferably, the cutter is fixedly connected to the pelletizing drum and is located downstream of the point where the die sleeve and the pressing roller are closest. The fixed relative position between the cutter and the pressing roller allows feed pellets of uniform length to be obtained while the die sleeve rotation speed remains unchanged.

[0015] Furthermore, the discharge port of the pelletizing drum of the present invention is provided with a stirring rod for further breaking up the formed feed pellets to prevent the feed pellets from sticking together. The stirring rod is a spring wire with a horizontal axis to reduce the impact force of the stirring rod on the feed pellets.

[0016] Preferably, the stirring rod is driven by the central rotating shaft through a differential structure. The differential structure includes a driving bevel gear, an intermediate bevel gear and a passive bevel gear. The driving bevel gear, the intermediate bevel gear and the passive bevel gear are wrapped in an isolation sleeve and are respectively connected to the isolation sleeve for rotation. The intermediate bevel gear is respectively engaged with the driving bevel gear and the passive bevel gear. The driving bevel gear is fixedly connected to the lower end of the central rotating shaft. The passive bevel gear is fixedly connected to the passive shaft. The lower end of the passive shaft is fixedly connected to the stirring rod. In the present invention, the central rotating shaft can drive the driving bevel gear to rotate, and the driving bevel gear drives the passive bevel gear to rotate through the intermediate bevel gear. The differential structure is used to slow down the rotation speed of the passive shaft and the stirring rod, thereby realizing slow rotation of the stirring rod.

[0017] Preferably, a material pipe is provided at the feed end of the feed ring, and a follower feed pipe is provided at the discharge end of the feed ring. The follower feed pipe is fixedly connected to the driving gear, and the follower feed pipe is rotationally connected to the feed ring through the annular bottom plate of the feed ring.

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

[0019] 1. This split-type ring die feed pellet forming assembly is divided into two parts: the side wall and the bottom plate of the ring die. The rapid rotation of the bottom plate is used to achieve rapid and sufficient adhesion of feed powder to the wall, and the speed of the die sleeve is used as a control component for the efficiency of pellet pressing. The combination of the two can achieve high efficiency and high quality of ring die pelleting while maintaining work efficiency.

[0020] 2. This split-type ring die feed pellet forming assembly sets a vibration chamber on the centrifugal bottom plate to utilize the rotation of the centrifugal bottom plate to generate vibration of the centrifugal bottom plate, thereby reducing the adhesion of feed powder on the upper surface of the centrifugal bottom plate and assisting the feed powder to form a material layer on the die sleeve.

[0021] 3. This split ring die feed pellet forming assembly achieves low-speed rotation of the stirring rod through a differential structure, which is used to stir and disperse the feed.

[0022] In summary, the split ring die feed pellet forming assembly and forming method thereof separately set the side wall and bottom plate of the ring die, which can achieve rapid and sufficient adhesion of feed powder to the wall, while maintaining work efficiency and achieving high quality of ring die pelleting. At the same time, the central rotating shaft is the power part of the pelletizing cylinder, which can not only realize feed pellet forming, but also form the vibration of the center bottom plate and break up the feed, and the overall structure is compact. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the structure of the feed pellet forming component;

[0024] Figure 2 This is a structural diagram of the intermediate gear of the feed pellet forming component;

[0025] Figure 3 This is a schematic diagram of the structure of the magnetic plate of the feed pellet forming component;

[0026] Figure 4 This is a structural diagram of the feed pellet forming component A;

[0027] Figure 5 This is a step diagram of the feed pellet forming method.

[0028] In the figure: 1. Granulating cylinder; 2. Feed ring; 3. Central rotating shaft; 4. Driving gear; 5. Die sleeve; 6. Centrifugal bottom plate; 7. Press roller; 8. Magnetic plate; 9. Intermediate gear; 10. Ring gear; 11. Cutter; 12. Support frame; 13. Differential structure; 14. Passive shaft; 15. Stirring rod; 21. Material pipe; 22. Follow-up feed pipe; 31. Extension shaft; 61. Vibration chamber; 62. Metal ball; 63. Elastic wire; 71. Fixed shaft; 131. Driving bevel gear; 132. Intermediate bevel gear; 133. Passive bevel gear; 134. Isolation box. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0030] Example 1

[0031] Reference Figure 1 The split-type ring die feed pellet forming assembly includes a pelletizing cylinder 1 located at the bottom and a feed ring 2 located at the top. The feed ring 2 is used for continuous feeding of the pelletizing cylinder 1, and the pelletizing cylinder 1 is used for granulating feed raw materials.

[0032] Specifically, a coaxial ring die is positioned within the pelletizing drum 1. The ring die comprises a die sleeve 5 serving as a sidewall and a centrifugal bottom plate 6 for bottom sealing. The die sleeve 5 is provided with a feed hole oriented toward the axis. A pressure roller 7 is positioned within the ring die, capable of relative movement with the die sleeve 5. The pressure roller 7 is configured to compress the material layer on the die sleeve 5, forcing it through the feed hole in the die sleeve 5 to form feed strands. A cutter 11 is positioned outside the die sleeve 5 and is configured to cut the feed strands into feed pellets, which are then discharged from the bottom outlet of the pelletizing drum.

[0033] In this embodiment, the die sleeve 5 and the centrifugal bottom plate 6 are respectively connected to the granulating drum 1 for rotation, and the die sleeve 5 and the centrifugal bottom plate 6 are connected in a rotating sealed manner. During granulation, when the tempered feed powder enters the interior of the ring die, the feed powder first contacts the centrifugal bottom plate 6. Under the rotation of the centrifugal bottom plate, the feed powder produces a centrifugal effect, and the feed powder accumulates toward the edge of the centrifugal bottom plate and extends toward the inner wall of the die sleeve, forming a material layer on the inner wall of the die sleeve. In this process, the rotation speed of the centrifugal bottom plate is maintained greater than the rotation speed of the die sleeve. The high-speed rotation of the centrifugal bottom plate can accelerate the accumulation speed of the feed powder on the inner wall of the die sleeve, forming a thicker material layer on the inner wall of the die sleeve. The die sleeve can rotate rapidly, increasing the speed of the die sleeve relative to the pressure roller, thereby improving the granulation efficiency.

[0034] refer to Figure 1 and Figure 2 The granulating cylinder 1 is provided with a coaxial central rotating shaft 3, the upper end of which is used to connect to a forming motor that drives the central rotating shaft 3 to rotate. A driving gear 4 is sleeved on the central rotating shaft 3. A support frame 12 is also provided inside the granulating cylinder 1, which is rotatably connected to the inner wall of the granulating cylinder 1. The support frame 12 is fixedly connected to a ring gear 10 and a die sleeve 5. An intermediate gear 9 is provided between the ring gear 10 and the driving gear 4, and the intermediate gear 9 is respectively engaged with the ring gear 10 and the driving gear 4. The pressure roller 7 inside the die sleeve 5 and the intermediate gear 9 are both rotatably connected to the granulating cylinder 1 via a fixed shaft 71.

[0035] In this embodiment, the central rotating shaft 3 drives the driving gear 4 to rotate, which in turn causes the intermediate gear 9 and the ring gear 10 to rotate separately. The central rotating shaft 3 drives the centrifugal base plate 6 to rotate, the intermediate gear 9 drives the pressure roller 7 to rotate, and the ring gear 10 drives the die sleeve 5 to rotate. The centrifugal base plate 6 and the die sleeve 5 rotate in opposite directions, while the die sleeve 5 rotates in the same direction as the pressure roller 7, so that the pressure roller 7 can exert a pressing force on the material layer of the die sleeve 5. In the present invention, the position of the pressure roller 7 is fixed, and the die sleeve 5 can move relative to the pressure roller 7.

[0036] During the above process, the rotation direction of the centrifugal bottom plate 6 is opposite to that of the die sleeve 5. When the rotation directions of the centrifugal bottom plate 6 and the die sleeve 5 are opposite, the feed powder accumulated on the edge of the centrifugal bottom plate 6 is affected by friction in two directions, and the fluidity of the feed powder is better, which is conducive to extending toward the inner wall of the die sleeve 5.

[0037] In this embodiment, the cutter 11 is fixedly connected to the pelletizing drum 1 and is located downstream of the point where the die sleeve 5 is closest to the pressing roller 7. The fixed relative position between the cutter 11 and the pressing roller 7 allows feed pellets of uniform length to be obtained while maintaining the rotation speed of the die sleeve 5.

[0038] In this embodiment, a material pipe 21 is provided at the feed end of the feed ring 2, and a follower feed pipe 22 is provided at the discharge end of the feed ring 2. The follower feed pipe 22 is fixedly connected to the driving gear 4, and the follower feed pipe 22 is rotatably connected to the feed ring 2 through the annular bottom plate of the feed ring 2.

[0039] The split ring die feed pellet forming assembly in this embodiment has the side wall and bottom plate of the ring die separately set, wherein the rapid rotation of the bottom plate is used to achieve rapid and sufficient adhesion of feed powder to the wall, and the speed of the die sleeve is used as a control component for the efficiency of pressing pellets. The combination of the two can achieve high efficiency and high quality of ring die pelleting while maintaining work efficiency.

[0040] Example 2

[0041] refer to Figure 3 and Figure 4 , different from Example 1, in this embodiment, a vibration chamber 61 is provided inside the centrifugal bottom plate 6 of the split-type ring die feed pellet forming assembly, and a metal ball 62 is provided inside the vibration chamber 61. The metal ball 62 is connected to the cavity wall of the vibration chamber 61 in the axial direction of the centrifugal bottom plate 6 through an elastic member 63. Magnetic blocks are provided on the magnetic plate 8, and the magnetic blocks are distributed at intervals around the center of the magnetic plate 8. The magnetic plate 8 is fixedly connected to the granulation cylinder 1 and is located below the centrifugal bottom plate 6. In the present invention, the metal ball 62 can be adsorbed by the magnetic blocks on the magnetic plate 8. When the centrifugal bottom plate 6 rotates, the metal ball 62 is intermittently adsorbed, so that the metal ball 62 can vibrate inside the vibration chamber 61, thereby reducing the adhesion of feed powder on the upper surface of the centrifugal bottom plate 6, facilitating rapid centrifugation of feed powder, and helping the feed powder to form a material layer in the die sleeve.

[0042] Example 3

[0043] Unlike Example 2, the discharge port of the pelletizing drum 1 in this embodiment is provided with a stirring rod 15, which is used to further disperse the formed feed pellets to prevent them from sticking together. The stirring rod 15 is a spring wire with a horizontal axis, which reduces the impact force of the stirring rod 15 on the feed pellets.

[0044] In this embodiment, the stirring rod 15 is driven by the central rotating shaft 3 through the differential structure 13. The differential structure 13 includes a driving bevel gear 131, an intermediate bevel gear 132 and a passive bevel gear 133. The driving bevel gear 131, the intermediate bevel gear 132 and the passive bevel gear 133 are wrapped in an isolation sleeve 134 and are respectively rotatably connected to the isolation sleeve 134. The intermediate bevel gear 132 is respectively engaged with the driving bevel gear 131 and the passive bevel gear 133. The driving bevel gear 131 is fixedly connected to the lower end of the central rotating shaft 3. The passive bevel gear 133 is fixedly connected to the passive shaft 14. The lower end of the passive shaft 14 is fixedly connected to the stirring rod 15. In the present invention, the central rotating shaft 3 can drive the driving bevel gear 131 to rotate. The driving bevel gear 131 drives the passive bevel gear 133 to rotate through the intermediate bevel gear 132. The differential structure 13 is used to slow down the rotation speed of the passive shaft 14 and the stirring rod 15, thereby realizing slow rotation of the stirring rod 15.

[0045] The forming method of the split ring die feed pellet forming assembly in this embodiment includes the following steps:

[0046] Forming preparation process: The forming motor works, and the central shaft 3 drives the driving gear 4 and the centrifugal base plate 6 to rotate, so that the intermediate gear 9 and the ring gear 10 rotate respectively. Among them, the intermediate gear 9 drives the pressure roller 7 to rotate, and the ring gear 10 drives the die sleeve 5 to rotate. The rotation directions of the centrifugal base plate 6 and the die sleeve 5 are opposite, and the rotation direction of the die sleeve 5 is the same as that of the pressure roller 7, so that the pressure roller 7 can form a pressing force on the material layer of the die sleeve 5.

[0047] Molding work:

[0048] Step A1: The conditioned feed powder enters the feed ring 2 and enters the bottom of the ring die of the pelletizing cylinder 1 through the follower feed pipe 22;

[0049] Step A2: The feed powder contacts the centrifugal bottom plate 6. Under the high-speed rotation of the centrifugal bottom plate 6, the feed powder produces a centrifugal effect. The feed powder quickly accumulates toward the edge of the centrifugal bottom plate 6 and extends toward the inner wall of the die sleeve 5, forming a thick material layer on the inner wall of the die sleeve 5.

[0050] When the centrifugal bottom plate 6 rotates, the metal balls 62 inside the centrifugal bottom plate 6 are intermittently attracted by the magnetic blocks of the magnetic plate 8, and the metal balls 62 can vibrate inside the vibration chamber 61, thereby assisting the feed powder to form a material layer in the die sleeve;

[0051] Step A3: The pressing roller 7 rotates but remains in a fixed position, and the die sleeve 5 can move relative to the pressing roller 7. The pressing roller 7 moves relative to and squeezes the material layer on the inner wall of the die sleeve 5, causing the material layer to extrude from the material holes on the side wall of the ring die to form material strips;

[0052] Step A4: The die sleeve 5 drives the material strips through the cutter 11, which cuts the material strips to obtain feed pellets;

[0053] Step A5: the feed particles pass through the stirring rod 15 , which breaks up the feed particles. The broken feed particles come out of the discharge port at the bottom of the pelletizing cylinder 1 .

[0054] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. Split ring die feed pellet forming assembly, characterized in that: It comprises a granulating cylinder (1) located at the bottom and a feeding ring (2) located at the top, wherein a coaxial ring die, a central rotating shaft (3), a magnetic plate (8) and a stirring rod (15) are arranged inside the granulating cylinder (1), and a cutting knife (11) is located outside the ring die; The ring die comprises a die sleeve (5) serving as a side wall and a centrifugal bottom plate (6) for bottom sealing, the die sleeve (5) and the centrifugal bottom plate (6) being separately provided, the die sleeve (5) and the centrifugal bottom plate (6) being rotationally connected to the granulating cylinder (1) respectively, the die sleeve (5) and the centrifugal bottom plate (6) being rotationally sealed, and the rotation speed of the centrifugal bottom plate (6) being greater than the rotation speed of the die sleeve (5); A vibration chamber (61) is provided inside the centrifugal bottom plate (6), a metal ball (62) is provided inside the vibration chamber (61), and the metal ball (62) is connected to the cavity wall of the vibration chamber (61) in the axial direction of the centrifugal bottom plate (6) via an elastic member (63); magnetic blocks are provided on the magnetic plate (8), and the magnetic blocks are distributed at intervals around the center of the magnetic plate (8); the magnetic plate (8) is fixedly connected to the granulating cylinder (1) and is located below the centrifugal bottom plate (6); The rotation direction of the centrifugal bottom plate (6) is opposite to the rotation direction of the mold sleeve (5); The central rotating shaft (3) is sleeved with a driving gear (4); a support frame (12) is further provided inside the granulating cylinder (1) and is rotatably connected to the inner wall of the granulating cylinder (1); the support frame (12) is fixedly connected to a gear ring (10) and a die sleeve (5); an intermediate gear (9) is provided between the gear ring (10) and the driving gear (4); the intermediate gear (9) is meshed with the gear ring (10) and the driving gear (4) respectively; the pressure roller (7) inside the die sleeve (5) and the intermediate gear (9) are both rotatably connected to the granulating cylinder (1) via a fixed shaft (71).

2. The split ring die feed pellet forming assembly according to claim 1, characterized in that: The cutter (11) is fixedly connected to the granulating cylinder (1), and the cutter (11) is located on the downstream side of the point where the die sleeve (5) and the pressing roller (7) are closest.

3. The split ring die feed pellet forming assembly according to claim 1 or 2, characterized in that: The invention also includes a differential structure (13), wherein the differential structure (13) includes a driving bevel gear (131), an intermediate bevel gear (132), and a passive bevel gear (133), wherein the intermediate bevel gear (132) is meshed with the driving bevel gear (131) and the passive bevel gear (133), respectively; the driving bevel gear (131) is fixedly connected to the lower end of the central rotating shaft (3); the passive bevel gear (133) is fixedly connected to the passive shaft (14); and the lower end of the passive shaft (14) is fixedly connected to the stirring rod (15).

4. The split ring die feed pellet forming assembly according to claim 3, characterized in that: The stirring rod (15) is a spring wire with a horizontal axis.

5. The split ring die feed pellet forming assembly according to claim 4, characterized in that: A material pipe (21) is provided at the feed end of the feed ring (2), and a follower feed pipe (22) is provided at the discharge end of the feed ring (2). The follower feed pipe (22) is fixedly connected to the driving gear (4), and the follower feed pipe (22) is rotatably connected to the feed ring (2) through the annular bottom plate of the feed ring (2).

6. A method for forming a split-type ring die feed pellet forming assembly according to any one of claims 1 to 2, comprising the following steps: Step 1: The bottom of the ring die performs circular motion to achieve the feed raw materials adhering to the wall of the die sleeve to form the target material layer; Step 2: Pressurize the material layer on the mold sleeve so that it passes through the material hole on the mold sleeve to obtain material strips; Step 3: Cut the material strips to obtain target particles.

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