Conical double-screw extruder

Abstract

The utility model provides a conical double-screw extruder, which solves the problems that materials are wasted and the production efficiency is influenced when the materials overflow. The seat body is arranged at the exhaust port of the machine barrel, and an air exhaust hole is formed in the seat body; the air passage is arranged in the seat body and comprises an upper air passage and a lower air passage, the width of the upper air passage is gradually reduced from top to bottom, the width of the lower air passage is gradually increased from top to bottom, and an air inlet of the lower air passage is smaller than or equal to an exhaust port of a machine barrel; the check block is arranged in the upper air channel and used for blocking the upper air channel; and the elastic reset piece is arranged between the seat body and the stop block. When material overflowing occurs, the baffle block and the inclined channel wall of the lower gas channel can block the material overflowing, and most of the melt falls to the exhaust port along the channel wall of the lower gas channel; the elastic reset piece is a spring, the check block is pushed upwards in the exhaust process, and if a small part of the overflowing materials enter the upper air channel, the melt can also fall to the exhaust port along the wall of the upper air channel.

Description

Technical Field

[0001] The utility model relates to the technical field of extruders, in particular to a conical twin-screw extruder. Background Art

[0002] The conical twin-screw extruder is the main equipment for mixing, dispersing and plasticizing polymer materials. It relies on the pressure and shear force generated by the heating of the extruder barrel and the friction of the screw rotation to extrude the materials after mixing, melting, plasticizing and dispersing. The conical twin-screw extruder includes a barrel and a conical screw. The conical screw is provided with an exhaust section and the barrel is provided with an exhaust port corresponding to the exhaust section. The purpose is to discharge the air or volatiles generated after plasticization to ensure the quality of the product. However, when the processed material contains a large amount of powder, moisture, small molecular substances or the plasticization is poor or the process setting is inappropriate, the material will be discharged from the exhaust port with the waste gas to form a bulging material. This will not only cause a waste of material, but also when there is too much bulging material, the exhaust port will be blocked, resulting in shutdown, which greatly affects the production efficiency of the extruder. Utility Model Content

[0003] In order to overcome the shortcomings of the background technology, the utility model provides a conical twin-screw extruder to solve the problem of material waste and production efficiency impact when material overflow occurs.

[0004] The technical solution adopted by the utility model is as follows:

[0005] The conical twin-screw extruder comprises a conical screw and a barrel, and also comprises:

[0006] A seat body is arranged at the exhaust port of the barrel, and an exhaust hole is provided on the seat body;

[0007] An airway is arranged in the seat body, the airway includes an upper airway and a lower airway, the width of the upper airway gradually decreases from top to bottom, the width of the lower airway gradually increases from top to bottom, and the air inlet of the lower airway is smaller than or equal to the exhaust port of the barrel;

[0008] A block is arranged in the upper airway, and the block is used to block the upper airway;

[0009] The elastic reset member is arranged between the seat body and the stopper.

[0010] A sealing gasket is arranged between the seat body and the exhaust port of the barrel.

[0011] The stopper is provided with a guide rod for cooperating with the seat body.

[0012] The wall of the lower airway is provided with an anti-stick coating.

[0013] The inner wall of the barrel near the feed inlet is uniformly distributed with spiral grooves, and the barrel is provided with drainage holes.

[0014] A cooling jacket is installed near the feed inlet of the barrel, and the distance between the inner wall of the cooling jacket and the outer wall of the barrel forms a cooling cavity, which extends from the feed inlet of the barrel to the end of the spiral groove.

[0015] A cooling hole is axially arranged at the center of the conical screw.

[0016] The beneficial effects of the utility model are:

[0017] When material overflow occurs, the block and the inclined wall of the lower airway can block the material overflow, and most of the molten material falls along the wall of the lower airway to the exhaust port; the elastic reset part is a spring, and the block is pushed upward during the exhaust process. If a small part of the material overflows into the upper airway, the molten material will also fall along the wall of the upper airway to the exhaust port; this structure will not cause waste of molten material while ensuring work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a cross-sectional schematic diagram of the barrel of the utility model.

[0019] Figure 2 This utility model Figure 1 A magnified schematic diagram of center A.

[0020] Figure 3 It is a cross-sectional schematic diagram of the conical screw of the utility model.

[0021] Conical screw 1, barrel 2, seat body 3, air exhaust hole 4, air duct 5, upper air duct 51, lower air duct 52, block 6, elastic reset member 7, guide rod 8, anti-stick coating 9, spiral groove 10, drain hole 11, cooling jacket 12, cooling cavity 13, cooling hole 14, sealing gasket 15. DETAILED DESCRIPTION

[0022] The utility model is further described below in conjunction with the accompanying drawings and embodiments:

[0023] In the embodiment, Figure 1 , Figure 2 , Figure 3 As shown, the conical twin-screw extruder includes a conical screw 1 and a barrel 2, and also includes:

[0024] A seat body 3 is arranged at the exhaust port of the barrel 2, and an exhaust hole 4 is provided on the seat body 3;

[0025] The airway 5 is arranged in the seat body 3, and the airway 5 includes an upper airway 51 and a lower airway 52. ​​The width of the upper airway 51 gradually decreases from top to bottom, and the width of the lower airway 52 gradually increases from top to bottom. The air inlet of the lower airway 52 is smaller than or equal to the exhaust port of the barrel 2;

[0026] A block 6 is disposed in the upper airway 51, and the block 51 is used to block the upper airway 51;

[0027] The elastic reset member 7 is arranged between the seat body 3 and the stopper 6 .

[0028] When material overflow occurs, the block 6 and the inclined wall of the lower air duct 52 can block the material overflow, and most of the molten material falls along the wall of the lower air duct 52 to the exhaust port; the elastic reset part 7 is a spring, and the block 6 is pushed upward during the exhaust process. If a small part of the material overflows into the upper air duct 51, the molten material will also fall along the wall of the upper air duct 51 to the exhaust port; this structure will not cause waste of molten material while ensuring work efficiency.

[0029] In the embodiment, Figure 1 , Figure 2 As shown, a sealing gasket 15 is provided between the seat body 3 and the exhaust port of the barrel 2. The sealing between the seat body 3 and the exhaust port of the barrel 2 is ensured to prevent the melt from overflowing from between the seat body and the exhaust port of the barrel 2.

[0030] In the embodiment, Figure 1 , Figure 2 As shown, the stopper 6 is provided with a guide rod 8 for cooperating with the seat body 3 to ensure the linearity of the stopper 6 moving up and down.

[0031] In the embodiment, Figure 1 , Figure 2 As shown, the wall of the lower airway 52 is provided with an anti-stick coating 9 to prevent the molten material from sticking to the wall of the lower airway 52.

[0032] In the embodiment, Figure 1 As shown, the inner wall of the barrel 2 near the feed port is uniformly distributed with spiral grooves 10, and the barrel 2 is provided with drainage holes 11. It is used to increase the friction with the inner wall of the barrel 2 to prevent some raw materials with moisture from slipping with the conical screw 1, thereby causing the feed port of the barrel 2 to be blocked; the drainage holes 11 are used to discharge the moisture squeezed out of the raw materials.

[0033] In the embodiment, Figure 1 As shown, a cooling jacket 12 is installed near the feed port of the barrel 2, and the distance between the inner wall of the cooling jacket 12 and the outer wall of the barrel 2 forms a cooling cavity 13, which extends from the feed port of the barrel 2 to the end of the spiral groove 10. The raw materials are cooled to prevent the raw materials from being plasticized prematurely due to excessive temperature, causing the original carbonization and affecting the quality of the extruded product.

[0034] In the embodiment, Figure 3 As shown, the center of the conical screw 1 is provided with a cooling hole 14 along the axial direction. By cooling the barrel and the screw at the same time, the melt is heated evenly and the quality of the product is guaranteed.

[0035] Obviously, the above embodiments of the present invention are merely examples for illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to provide all the implementation methods here. However, these obvious changes or modifications derived from the essential spirit of the present invention still fall within the scope of protection of the present invention.

Claims

1. A conical twin-screw extruder, comprising a conical screw (1) and a barrel (2), characterized in that: Also includes: A seat body (3) is arranged at the exhaust port of the barrel (2), and an exhaust hole (4) is provided on the seat body (3); An air passage (5) is arranged in the seat body (3), the air passage (5) comprising an upper air passage (51) and a lower air passage (52), the width of the upper air passage (51) gradually decreases from top to bottom, the width of the lower air passage (52) gradually increases from top to bottom, and the air inlet of the lower air passage (52) is smaller than or equal to the exhaust port of the barrel (2); A block (6) is arranged in the upper airway (51), and the block (6) is used to block the upper airway (51); The elastic reset member (7) is arranged between the seat body (3) and the stopper (6).

2. The conical twin-screw extruder according to claim 1, characterized in that: A sealing gasket (15) is provided between the seat body (3) and the exhaust port of the barrel (2).

3. The conical twin-screw extruder according to claim 1, characterized in that: The stopper (6) is provided with a guide rod (8) for cooperating with the seat body (3).

4. The conical twin-screw extruder according to claim 1, characterized in that: The wall of the lower airway (52) is provided with an anti-stick coating (9).

5. The conical twin-screw extruder according to claim 1, characterized in that: The inner wall of the barrel (2) near the feed inlet is evenly distributed with spiral grooves (10), and the barrel (2) is provided with a drainage hole (11).

6. The conical twin-screw extruder according to claim 5, characterized in that: A cooling jacket (12) is installed near the feed inlet of the barrel (2), and the distance between the inner wall of the cooling jacket (12) and the outer wall of the barrel (2) forms a cooling cavity (13), and the cooling cavity (13) extends from the feed inlet of the barrel (2) to the end of the spiral groove (10).

7. The conical twin-screw extruder according to claim 1, characterized in that: A cooling hole (14) is axially provided at the center of the conical screw (1).

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