Extrusion die of screw extruder

Abstract

The utility model provides an extrusion die of a screw extruder, which comprises a reducing component (2) and a die disc (3), the rear end of a hollow material channel (24) of the reducing component (2) is a small-diameter end (21), the front end of the hollow material channel (24) of the reducing component (2) is a large-diameter end (22), the small-diameter end (21) is communicated with an extruder connecting end (1) of the screw extruder, and the diameter of the small-diameter end (21) is matched with the pipe diameter of the extruder connecting end (1); a boss (31) is arranged in the middle area of the rear side of the die disc (3), the die disc (3) and the reducing component (2) are assembled with the banded extruder connecting end (1) through mechanical connection, and the boss (31) is located in the hollow material channel (24). According to the extrusion die disclosed by the utility model, the contact area between materials and the die disc is increased, the extrusion force on the extrusion disc and the materials is reduced, and the technical effects of improving the output ratio and the cost performance of products are achieved under the condition of ensuring smooth extrusion forming of the materials.

Description

Technical field

[0001] The utility model relates to the field of extruders, and more specifically, to an extrusion die of a screw extruder. [Background Technology]

[0002] An extruder is a device that relies on the pressure and shear force generated by the rotation of the screw to evenly mix and fully plasticize the material, and then forms it into strips or granular products through a die. In the water treatment industry, adsorbent products are usually processed and produced by extruders. Conventional extruders, such as single-screw extruders, usually include parts such as transmission, feeding device, barrel, screw, die head and extrusion die. Among them, in the extrusion die part, the die disk diameter of the traditional extruder is the same as the screw diameter, and the extrusion pressure at the die disk is constant. When this type of extruder is used to produce adsorbents, the strip products extruded under the operating pressure are too dense and the bulk density is too high under the same particle size conditions, resulting in a lower cost-effectiveness of the product. [Utility Model Content]

[0003] In order to reduce the extrusion force on the extrusion disc and the material and improve the product output ratio of the adsorbent produced by the extruder, the utility model provides an extrusion die of the screw extruder.

[0004] To achieve the above-mentioned object, the present invention provides an extrusion die for a screw extruder, the extrusion die comprising a reducing component 2 and a die plate 3, the reducing component 2 being a disc-shaped component having a hollow material channel 24, the rear end of the hollow material channel 24 being a small-diameter end 21 and the front end being a large-diameter end 22, the small-diameter end 21 being connected to an extruder connecting end 1 of the screw extruder, and the diameter of the small-diameter end 21 matching the pipe diameter of the extruder connecting end 1;

[0005] The mold plate 3 is a disk-shaped component. A boss 31 is provided in the middle area of ​​the rear side of the mold plate 3. The diameter of the boss 31 is smaller than the diameter of the small-diameter end 21. The mold plate 3 is provided with a plurality of forming holes 32. The forming holes 32 are evenly distributed in the area outside the boss 31. When the mold plate 3 is assembled with the diameter-changing component 2, the forming holes 32 are located within the large-diameter end 22.

[0006] The die plate 3 and the reducing component 2 are assembled with the extruder connecting end 1 through mechanical connection, and the boss 31 is located in the hollow material channel 24 .

[0007] In the present invention, for the sake of convenience of description rather than limitation, the direction toward the extruder is described as “rear”, and the direction toward the fixed pressing plate 4 is described as “front”.

[0008] The following explains the working principle of the present invention. After the material is added to the extruder, the screw inside the extruder connection 1 pushes the material out from the front end of the extruder connection 1. The material passes through the small diameter end 21 and the large diameter end 22 of the reducing member 2, and then contacts the die plate 3 with an increased cross-sectional area. The material is then continuously pushed and squeezed through the forming hole 32 in the die plate 3 to form the extruder.

[0009] Among them, the ratio of the diameter of the mold plate 3 to the inner diameter of the extruder connecting end 1 is 1 to 2.5:1. If it is smaller than this range, the extrusion pressure of the mold plate 3 cannot be reduced sufficiently, and the extruded material is too dense and cannot achieve a good material output ratio. If it is larger than this range, the material is too loose and cannot be effectively extruded and formed.

[0010] Preferably, the ratio of the diameter of the die plate 3 to the inner diameter of the extruder connecting end 1 is 1.6:1.

[0011] Preferably, the reducing component 2 is provided with a convex edge 23 with screw holes on the convex edge 23, and the extruder connecting end 1 is provided with an outwardly protruding wing 12 with screw holes on the wing 12, and the mold plate 3 and the reducing component 2 are assembled with the extruder connecting end 1 by screwing.

[0012] More preferably, the extrusion die further comprises a fixed pressing plate 4 , on which screw holes are provided, and the fixed pressing plate 4 , the die plate 3 , the reducing component 2 and the extruder connecting end 1 are screwed together by bolts 5 .

[0013] In the present invention, the boss 31 in the middle of the mold plate 3 is conducive to evenly distributing the extruded material in the material channel 24, so that the force is more evenly applied, which is beneficial for subsequent molding.

[0014] As a preferred solution of the present invention, the diameter-changing component 2 is provided with a convex edge 23 , the extruder connecting end 1 and the convex edge 23 are provided with screw holes, and the extruder connecting end 1 and the convex edge 23 are screwed.

[0015] As a preferred embodiment of the present invention, the reducing member 2, the die plate 3, and the fixed plate 4 are made of stainless steel. The reducing member 2, the die plate 3, and the fixed plate 4 can be manufactured using conventional forging processes to better control the degree of deformation of the parts under long-term use.

[0016] The extrusion die provided by the utility model increases the contact area of ​​the material on the die plate, reduces the extrusion force on the extrusion plate and the material, and achieves the technical effect of improving the product output ratio and cost performance while ensuring smooth extrusion molding of the material.

Brief Description of the Drawings

[0017] Figure 1 This is the main view of the extruder and extrusion die;

[0018] Figure 2 This is the left view of the extruder and extrusion die;

[0019] Figure 3 It is the left view of the extrusion die;

[0020] Figure 4 It is the main view of the extrusion die;

[0021] Figure 5 It is the structural diagram of the extrusion die;

[0022] Figure 6 It is the structural diagram of the reducing component;

[0023] Figure 7 It is the structural diagram of the mold plate;

[0024] Figure 8 It is the structural diagram of the fixed pressure plate;

[0025] Figure 9 This is the structural diagram of the connecting end of the extruder;

[0026] 1-Extruder connection end; 2-Reducing component; 3-Mold plate; 4-Fixed pressure plate; 5. Bolts;

[0027] 11-Material cavity; 12-Wing; 13-Wing screw hole;

[0028] 21- small diameter end; 22- large diameter end; 23- convex edge; 24- material channel;

[0029] 31- boss; 32- forming hole; 33- clamping portion. [Specific implementation method]

[0030] Example 1

[0031] like Figure 1-2 The screw extruder and extrusion die shown are shown, wherein the screw extruder is a conventional screw extruder purchased on the market.

[0032] The extrusion die includes a variable diameter component 2, a die plate 3 and a fixed pressure plate 4. Figure 3-5 shown.

[0033] The reducing component 2 is as follows Figure 6 , a disc-shaped component with a hollow material channel 24, the rear end of the channel is a small diameter end 21, and the front end of the channel is a large diameter end 22. The diameter of the small diameter end 21 matches the pipe diameter of the extruder connecting end 1.

[0034] Mold plate 3 as Figure 7, is a disc-shaped component with a boss 31 on the rear side. The diameter of the boss 31 is smaller than the diameter of the small-diameter end 21 so that the boss 31 is located within the hollow material channel 24. The mold disc 3 is provided with a plurality of forming holes 32, which are distributed in the area outside the boss 31;

[0035] The extruder connecting end 1 includes a material cavity 11 and a wing 12, as shown in FIG. Figure 9 shown.

[0036] In such Figure 8 Screw holes are provided on the fixed plate 4, and the fixed plate 4, the die plate 3, and the reducing component 2 are assembled with the extruder connecting end 1 by the cooperation of bolts and the screw holes. The boss 31 is located in the hollow material channel 24. The die plate 3 is provided with a clamping portion 33, which tightly clamps the fixed plate 4, the die plate 3, and the reducing component 2 together.

[0037] After assembly, the forming holes 32 on the die plate 3 are all located within the large diameter end 22 , ensuring that the material in the extruder connecting end 1 can flow smoothly into the forming holes 32 after passing through the hollow material channel 24 of the diameter-reducing component 2 .

[0038] During operation, after the material is added to the extruder, the screw in the material cavity 11 pushes the material out from the extruder connection end 1, first flows through the hollow material channel 24 of the diameter-reducing component 2, and through the design of the small-diameter end 21 and the large-diameter end 22, the material contacts the die plate 3 with an increased cross-sectional area. Under the push, the material is more evenly distributed in the material channel 24 through the frustum-shaped boss 31 on the die plate 3, and is distributed on the enlarged die plate 3. Under the subsequent continuous extrusion of the material, it is extruded through the forming hole 32 on the die plate 3 to form.

Claims

1. An extrusion die of a screw extruder, the extrusion die comprising a diameter reducing component (2) and a die plate (3), characterized in that The variable diameter component (2) is a disc-shaped component having a hollow material channel (24), the rear end of the hollow material channel (24) being a small diameter end (21) and the front end being a large diameter end (22), the small diameter end (21) being connected to the extruder connecting end (1) of the screw extruder, and the diameter of the small diameter end (21) matching the pipe diameter of the extruder connecting end (1); The mold disc (3) is a disc-shaped component. A boss (31) is provided in the middle area of ​​the rear side of the mold disc (3). The diameter of the boss (31) is smaller than the diameter of the small-diameter end (21). The mold disc (3) is provided with a plurality of forming holes (32). The forming holes (32) are evenly distributed in the area outside the boss (31). When the mold disc (3) and the diameter-changing component (2) are assembled, the forming holes (32) are located within the large-diameter end (22). The die plate (3) and the reducing component (2) are assembled with the extruder connecting end (1) through mechanical connection, and the boss (31) is located in the hollow material channel (24).

2. The extrusion die according to claim 1, characterized in that The ratio of the diameter of the die plate (3) to the inner diameter of the extruder connecting end (1) is 1-2.5:

1.

3. The extrusion die according to claim 1, characterized in that The ratio of the diameter of the die plate (3) to the inner diameter of the extruder connecting end (1) is 1.6:

1.

4. The extrusion die according to claim 1, characterized in that The diameter-reducing component (2) is provided with a convex edge (23) with screw holes provided on the convex edge (23), and the extruder connecting end (1) is provided with an outwardly protruding wing portion (12) with screw holes provided on the wing portion (12). The mold plate (3) and the diameter-reducing component (2) are assembled with the extruder connecting end (1) by screw connection.

5. The extrusion die according to claim 4, characterized in that The extrusion die further comprises a fixed pressing plate (4), on which screw holes are provided, and the fixed pressing plate (4), the die plate (3) and the reducing component (2) are assembled with the extruder connecting end (1) by screw connection.

6. The extrusion die according to claim 1 or 5, characterized in that The material of the diameter-changing component (2), the mold plate (3) and the fixed pressing plate (4) is stainless steel.

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