A granulating die for forced feed and peristaltic forming

Abstract

The application relates to a granulating die for forced feeding and peristaltic forming, belonging to the technical field of feed granulating and forming machines. The granulating die comprises a compression roller assembly and a die disc assembly, the compression roller assembly is installed on the die disc assembly, the minimum installation gap delta is 0-5mm, a plurality of die holes are formed on the die disc assembly, the compression roller assembly is evenly distributed along the circumferential surface of the die disc assembly, the compression roller shafts of the compression roller assembly are perpendicular to the axis of the die disc assembly, a plurality of rows of protrusions are arranged on the outer circumferential surface of the compression roller shell body of the compression roller shell assembly, and the adjacent two rows of protrusions are staggered. The granulating die can realize forced feeding and granulation of the feed, the feed can smoothly enter the die holes, meanwhile, peristalsis is beneficial to stress relaxation of the feed in the die holes, the friction between the feed in the die holes and the die hole wall surface is reduced, and the problem that the current feed granulator is prone to blockage is solved.

Description

Technical Field

[0001] This invention belongs to the field of feed pelleting machinery technology, and in particular relates to a pelleting mold with forced feeding and peristaltic forming. Background Technology

[0002] Pelletizing improves feed palatability, increases animal feed intake, digestibility, and daily weight gain, and facilitates transportation and storage. It effectively alleviates seasonal and annual imbalances in feed supply and demand, making it an inevitable trend in feed processing and a key technology for developing intensive, large-scale, and feed-saving livestock farming. Die roller extrusion is the most commonly used feed pelleting device. However, existing die roller extrusion feed pelleting machines suffer from severe clogging, especially for mixed feeds containing wet, sticky components, which significantly affects pelleting efficiency. Summary of the Invention

[0003] To address the aforementioned technical problem of easy clogging during the feed pelleting process, this invention provides a pelleting die with forced feeding and peristaltic forming. By cooperating with the anti-clogging pelleting roller and the die plate, clogging during feed pelleting is prevented, thereby improving the efficiency of feed pelleting.

[0004] The objective of this invention is achieved through the following technical solution:

[0005] This invention discloses a forced feeding and peristaltic forming pelletizing die, comprising a pressure roller assembly and a die plate assembly. The pressure roller assembly is mounted on the die plate assembly. The minimum installation gap δ between the pressure rollers of the die plate assembly B and the pressure roller assembly A is 0-5mm. Multiple die holes are opened on the die plate assembly. Multiple pressure rollers are evenly distributed along the circumference of the upper surface of the die plate assembly. The axis of the pressure roller shaft of the pressure roller assembly is perpendicular to the axis of the die plate assembly. The outer circumference of the pressure roller shell assembly of the pressure roller assembly has multiple rows of protrusions.

[0006] Furthermore, the pressure roller shell assembly has multiple rows of protrusions on the outer circumference of the pressure roller shell. The protrusions are composed of spherical protrusions and curved protrusions. The spherical protrusions are hemispherical with a radius R of 5-15mm. The guide of the curved protrusion is an arc formed by the outermost endpoint of the hemispherical arc and a point on the circumferential surface of the pressure roller shell between the outermost endpoint of the hemispherical arc and the adjacent spherical protrusion in the circumferential direction. The generatrix of the curved protrusion is the gradually decreasing hemispherical arc of the spherical protrusion. That is, the cross-section of the curved protrusion is the hemispherical arc of the spherical protrusion sheared by different shear planes, and the hemispherical arc gradually decreases from the spherical protrusion to the end of the pressure roller shell.

[0007] Furthermore, the angle θ between the line connecting the center lines of the axially adjacent spherical protrusions on the outer periphery of the pressure roller shell and the axis of the pressure roller shell is 0-60°.

[0008] Furthermore, the roller shafts of the multiple roller assemblies are connected as one unit. Each roller assembly includes a roller shaft, a roller housing assembly, a bearing, a retaining ring, a washer, a bearing cover, and a nut. The roller housing assembly is sleeved on the roller shaft through the bearing. A groove for accommodating the retaining ring is opened on the inner circumferential surface of the roller housing end at the extended end of the roller shaft. The retaining ring is placed in the groove. A washer, a bearing cover, and a nut are sequentially sleeved on the extended end of the roller shaft. The nut is fixed to the roller shaft by threads.

[0009] Furthermore, the mold holes on the mold plate assembly include, from top to bottom, a smooth curved surface, a creeping convex surface, a creeping concave surface, and a straight hole that are connected in transition; a coordinate system xOy is established with the center line y of the mold hole and the horizontal line x on the surface of the mold plate assembly, and the generatrix of the smooth curved surface is a part of the curve of the expression y=ax+b+c in the fourth quadrant, where a, b, and c are all constants, and a>1, c<0.

[0010] Furthermore, the peristaltic convex surface is composed of 1-2 annular protrusions, and the peristaltic concave surface is composed of 1-2 concave rings, with the peristaltic convex surface and the peristaltic concave surface being arranged at intervals; the diameter D1 at the maximum hole of the smooth curved surface is 1.1-1.5 times the diameter D4 of the straight hole; the diameter D2 at the minimum hole of the peristaltic convex surface is 0.8-1 times the diameter D4 of the straight hole; and the maximum diameter D3 of the peristaltic concave surface is 1.1-1.4 times the diameter D4 of the straight hole.

[0011] Furthermore, the height H1 of the smooth curved surface is 0.5-1.5 times the diameter D4 of the straight hole; the height H2 of the straight hole is 0.5-1 times the diameter D4 of the straight hole.

[0012] The beneficial effects of this invention are as follows:

[0013] 1. The present invention provides a pressure roller assembly on the mold plate assembly. The pressure roller assembly has a protrusion on the outer shell of the pressure roller. The protrusion is composed of spherical protrusion and curved protrusion connected together. It has a pushing effect on the feed, prevents slippage between the pressure roller and the material, avoids material stagnation, and forces the feed to be fed in, thereby improving the pelleting efficiency of the feed.

[0014] 2. In this invention, the mold hole of the mold plate assembly is composed of a smooth curved surface, a peristaltic convex surface, a peristaltic concave surface and a straight hole. The feed can smoothly enter the forming hole. At the same time, the feed peristaltically flows and forms under the extrusion action, which is conducive to the relaxation of feed stress in the mold hole, reduces the friction force with the hole wall, and effectively prevents the mold hole from being blocked. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the present invention.

[0016] Figure 2 This is a schematic diagram of the assembly of the pressure roller assembly.

[0017] Figure 3 This is a schematic diagram of the pressure roller shell assembly.

[0018] Figure 4 This is a schematic diagram of the mold plate assembly.

[0019] Figure 5 This is a cross-sectional view of the mold assembly.

[0020] In the diagram: A. Pressure roller assembly B. Die plate assembly C. Nut D. Bearing cover E. Washer F. Retaining ring G. Bearing H. Pressure roller shell assembly I. Pressure roller shaft 1. Spherical protrusion 2. Curved protrusion 3. Pressure roller shell 4. Mounting threaded hole 5. Keyway hole 6. Die hole 7. Smooth curved surface 8. Creeping convex surface 9. Creeping concave surface 10. Straight hole. Detailed Implementation

[0021] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0022] Example 1: The present invention discloses a forced feeding and peristaltic forming pelleting die for feed pelleting, comprising a pressure roller assembly A and a die plate assembly B. The pressure roller assembly A is mounted on the die plate assembly B. The minimum installation gap between the pressure rollers of the die plate assembly B and the pressure roller assembly A is δ = 0-5mm, in this example δ = 5mm. Multiple die holes 6 are opened on the die plate assembly B. Multiple pressure rollers 6 are evenly distributed along the circumference of the upper surface of the die plate assembly B, in this example three. The axis of the pressure roller shaft I of the pressure roller assembly A is perpendicular to the axis of the die plate assembly B. The outer circumference of the pressure roller shell 3 of the pressure roller shell assembly H in the pressure roller assembly A is provided with multiple rows of protrusions.

[0023] In this example, the roller shell assembly H consists of multiple rows of protrusions on the outer circumference of the roller shell 3. These protrusions are formed by connecting spherical protrusions 1 and curved protrusions 2. The spherical protrusion 1 is a hemisphere with a radius R of 5-15 mm; in this example, the radius R is 10 mm. The guide line of the curved protrusion 2 is an arc formed by the outermost endpoint of the hemispherical arc and a point on the circumferential surface of the roller shell 3 between the outermost endpoint of the hemispherical arc and the adjacent spherical protrusion 1 in the circumferential direction. The generatrix of the curved protrusion 2 is the gradually decreasing hemispherical arc of the spherical protrusion 1; that is, the cross-section of the curved protrusion 2 is the hemispherical arc of the spherical protrusion 1 sheared with different shear planes, gradually decreasing in size from the spherical protrusion 1 to the end of the roller shell 3. The protrusions have a pushing effect on the feed, allowing for forced feeding and preventing slippage between the roller and the material, thus avoiding feed stagnation.

[0024] The angle θ between the line connecting the center lines of the adjacent spherical protrusions 1 on the outer periphery of the pressure roller housing 3 and the axis of the pressure roller housing 3 is 0-60°, and in this example θ is 30°.

[0025] In this example, the three pressure roller assemblies A are connected as one unit and fixed to the granulator housing by each pressure roller shaft I. Each pressure roller assembly A includes a pressure roller shaft I, a pressure roller housing assembly H, a bearing G, a retaining ring F, a washer E, a bearing cover D, and a nut C. The pressure roller housing assembly H is sleeved on the pressure roller shaft I through the bearing G. A groove for accommodating the retaining ring F is opened on the inner circumferential surface of the pressure roller housing 3 end of the extended end of the pressure roller shaft I. The retaining ring F is placed in the groove. The washer E, the bearing cover D, and the nut C are sequentially sleeved on the extended end of the pressure roller shaft I. The nut C is fixed to the pressure roller shaft I by threads.

[0026] The mold hole 6 on the mold assembly B includes, from top to bottom, a smooth curved surface 7, a creeping convex surface 8, a creeping concave surface 9, and a straight hole 10 that are connected by transitions. A coordinate system xOy is established with the center line y of the mold hole 6 and the horizontal line x on the surface of the mold assembly B. The generatrix of the smooth curved surface 7 is a part of the curve of the expression y=ax+b+c in the fourth quadrant, where a, b, and c are all constants, and a>1, c<0.

[0027] In this example, the peristaltic convex surface 8 is composed of two annular protrusions, and the peristaltic concave surface 9 is composed of two concave rings. The peristaltic convex surface 8 and the peristaltic concave surface 9 are respectively spaced apart. The peristaltic convex surface 8 connects to the smooth curved surface 7, and the peristaltic concave surface 9 connects to the straight hole 10, forming a shape as shown in the example. Figure 5 The mold hole 6 is formed by sequentially connecting the smooth curved surface 7, the peristaltic convex surface 8, the peristaltic concave surface 9, the peristaltic convex surface 8, the peristaltic concave surface 9, and the straight hole 10. The diameter D1 of the largest hole on the smooth curved surface 7 is 1.1 times the diameter D4 of the straight hole 10; the diameter D2 of the smallest hole on the peristaltic convex surface 8 is 0.8 times the diameter D4 of the straight hole 10; and the maximum diameter D3 of the peristaltic concave surface 9 is 1.1 times the diameter D4 of the straight hole 10. The height H1 of the smooth curved surface 7 is 0.5 times the diameter D4 of the straight hole 10; and the height H2 of the straight hole is 0.5 times the diameter D4 of the straight hole 10. This allows the feed to smoothly enter the forming mold hole. Under repeated extrusion, the feed undergoes peristaltic flow and molding, which helps to relax the stress of the feed inside the mold hole, reduces the friction force with the hole wall, and prevents the mold hole from clogging.

[0028] The mold plate assembly B also has a keyway hole 5 and mounting threaded holes 4 located on both sides of the keyway hole 5. The keyway hole 5 is a hole with a keyway and is connected to the pellet mill body through the keyway hole 5. The mounting threaded holes 4 are used to remove the mold plate by connecting bolts.

[0029] In use, this invention is installed inside the pellet mill housing (existing technology). The pressure roller assembly A is fixed to the pellet mill housing via each pressure roller shaft I. The die plate assembly B is connected to the pellet mill body (existing technology) via keyway holes 5. The pellet mill body drives the die plate assembly B to rotate. The friction between the material and the die causes the pressure roller housing 3 to rotate around the pressure roller shaft I. The material falling between the pressure roller assembly A and the die plate assembly B is squeezed into the die hole 6 of the die plate assembly B under the squeezing action of the pressure roller housing 3. The material peristaltically flows and forms in the die hole 6, and the resulting material particles are discharged through the bottom of the die hole 6.

[0030] Example 2: This example differs from Example 1 in that: the minimum installation gap δ between the mold plate assembly B and the pressure roller assembly A is 0mm; the hemispherical radius R of the spherical protrusion 1 is 5mm; and the angle θ between the line connecting the center lines of the adjacent spherical protrusions 1 on the outer circumference of the pressure roller housing 3 and the axis of the pressure roller housing 3 is 0°.

[0031] In this example, the peristaltic convex surface 8 consists of a circular protrusion, and the peristaltic concave surface 9 consists of a concave ring. The diameter D2 at the smallest opening of the peristaltic convex surface 8 is equal to the diameter D4 of the straight hole 10; the diameter D1 at the largest opening of the smooth curved surface 7 is 1.5 times the diameter D4 of the straight hole 10; the maximum diameter D3 of the peristaltic concave surface 9 is 1.4 times the diameter D4 of the straight hole 10. The height H1 of the smooth curved surface 7 is 1.5 times the diameter D4 of the straight hole 10; the height H2 of the straight hole 10 is 1 time the diameter D4 of the straight hole 10.

[0032] Example 3: This example differs from Example 1 in that: the minimum installation gap δ between the mold plate assembly B and the pressure roller assembly A is 3mm; the hemispherical radius R of the spherical protrusion 1 is 15mm; and the angle θ between the line connecting the center lines of the adjacent spherical protrusions 1 on the outer circumference of the pressure roller housing 3 and the axis of the pressure roller housing 3 is 60°.

[0033] In this example, the diameter D1 of the maximum hole on the smooth curved surface 7 is 1.3 times the diameter D4 of the straight hole 10; the diameter D2 of the minimum hole on the creeping convex surface 8 is 0.9 times the diameter D4 of the straight hole 10; and the maximum diameter D3 of the creeping concave surface 9 is 1.2 times the diameter D4 of the straight hole 10. The height H1 of the smooth curved surface 7 is 1.1 times the diameter D4 of the straight hole 10; and the height H2 of the straight hole 10 is 0.8 times the diameter D4 of the straight hole 10.

[0034] Components not described in detail in this application are all existing conventional technologies and will not be described further here.

[0035] It is understood that the above specific description of the present invention is only for illustrating the present invention and is not limited to the technical solutions described in the embodiments of the present invention. Those skilled in the art should understand that modifications or equivalent substitutions can still be made to the present invention to achieve the same technical effect; as long as the use needs are met, they are all within the protection scope of the present invention.

Claims

1. A pelletizing mold for forced feeding and peristaltic molding, characterized in that: The assembly includes a pressure roller assembly and a die plate assembly. The pressure roller assembly is mounted on the die plate assembly. The minimum installation gap δ between the pressure rollers of the die plate assembly B and the pressure roller assembly A is 0-5mm. Multiple die holes are formed on the die plate assembly, which, from top to bottom, include a smooth curved surface with transitional connections, a creeping convex surface, a creeping concave surface, and a straight hole. Multiple pressure rollers are evenly distributed circumferentially along the upper surface of the die plate assembly. The axis of the pressure roller shaft of the pressure roller assembly is perpendicular to the axis of the die plate assembly. The outer circumference of the pressure roller shell assembly of the pressure roller assembly is axially... There are multiple rows of protrusions, which are composed of spherical protrusions and curved protrusions connected together. The spherical protrusions are hemispherical. The guide of the curved protrusion is an arc formed by the outermost end of the hemispherical arc and a point on the circumferential surface of the pressure roller shell between the outermost end of the hemispherical arc and the adjacent spherical protrusion in the circumferential direction. The generatrix of the curved protrusion is the hemispherical arc of the spherical protrusion that gradually decreases. The cross section of the curved protrusion is the hemispherical arc of the spherical protrusion sheared by different shear planes. The hemispherical arc gradually decreases from the spherical protrusion to the end of the pressure roller shell.

2. The granulation mold with forced feeding and peristaltic forming according to claim 1, characterized in that: The convex hemispherical surface has a radius R of 5-15 mm.

3. The granulation mold with forced feeding and peristaltic forming according to claim 1, characterized in that: The angle θ between the line connecting the center lines of the axially adjacent spherical protrusions on the outer periphery of the pressure roller housing and the axis of the pressure roller housing is 0-60°.

4. The granulation mold with forced feeding and peristaltic forming according to claim 1, characterized in that: The roller shafts of multiple roller assemblies are connected as one unit. Each roller assembly includes a roller shaft, a roller housing assembly, a bearing, a retaining ring, a washer, a bearing cover, and a nut. The roller housing assembly is sleeved on the roller shaft through the bearing. A groove for accommodating the retaining ring is opened on the inner circumferential surface of the roller housing end at the extended end of the roller shaft. The retaining ring is placed in the groove. A washer, a bearing cover, and a nut are sequentially sleeved on the extended end of the roller shaft. The nut is fixed to the roller shaft by threads.

5. The granulation mold for forced feeding and peristaltic forming according to claim 1, characterized in that: The mold holes on the mold plate assembly are used to establish a coordinate system xOy with the center line y of the mold holes and the horizontal line x on the surface of the mold plate assembly. The generatrix of the smooth surface is expressed as y=a. x+b The curve with +c lies in a portion of the fourth quadrant, where a, b, and c are all constants, and a > 1 and c < 0.

6. The granulation mold with forced feeding and peristaltic forming according to claim 5, characterized in that: The peristaltic convex surface is composed of 1-2 annular protrusions, and the peristaltic concave surface is composed of 1-2 concave rings. The peristaltic convex surface and the peristaltic concave surface are arranged alternately. The diameter D1 of the maximum hole on the smooth curved surface is 1.1-1.5 times the diameter D4 of the straight hole. The diameter D2 of the minimum hole on the peristaltic convex surface is 0.8-1 times the diameter D4 of the straight hole. The maximum diameter D3 of the peristaltic concave surface is 1.1-1.4 times the diameter D4 of the straight hole.

7. The granulation mold for forced feeding and peristaltic molding according to claim 5 or 6, characterized in that: The height H1 of the smooth curved surface is 0.5-1.5 times the diameter D4 of the straight hole; the height H2 of the straight hole is 0.5-1 times the diameter D4 of the straight hole.

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