CN214188373U

CN214188373U - Screw extruder

Info

Publication number: CN214188373U
Application number: CN202022617662.7U
Authority: CN
Inventors: 付建伟
Original assignee: Jilin Xinji Pipe Technology Co ltd
Current assignee: Jilin Xinji Pipe Technology Co ltd
Priority date: 2020-11-13
Filing date: 2020-11-13
Publication date: 2021-09-14
Anticipated expiration: 2030-11-13

Abstract

The utility model discloses a screw extruder, which comprises a frame, a machine barrel, a motor and a screw, wherein the screw comprises a conveying section, a first compression section, a second compression section, a metering section and an exhaust section; the machine barrel is sequentially divided into a first heating zone, a second heating zone, a third heating zone, a fourth heating zone and a fifth heating zone from the feeding end to the discharging end, and the five heating zones cover a first compression section, a second compression section, a metering section and an exhaust section of the screw; an interlayer is arranged at one end of the feeding hole of the machine barrel, a water inlet and a water outlet are respectively arranged on the interlayer, the water inlet is connected with a main water inlet pipe through a pipeline, and the water outlet is connected with a main water outlet pipe through a pipeline. The utility model discloses divide into two sections with the compression section, the material of being convenient for is carried forward, avoids piling up, is equipped with the water jacket intermediate layer in feed inlet one end simultaneously, avoids melting the membrane appearance, improves solid transport volume. In addition, the machine barrel is divided into five heating zones, so that the temperature control of the machine barrel is more accurate, the exhaust section is added after the metering section, the uniformity of products is improved, and the final product quality is ensured.

Description

Screw extruder

Technical Field

The utility model relates to a plastics production and processing equipment technical field, concretely relates to screw extruder.

Background

The screw extruder depends on the pressure and the shearing force generated by the rotation of the screw, so that materials can be fully plasticized and uniformly mixed and are molded through a neck mold. The plastic material enters the extruder from the hopper, is conveyed forward under the drive of the rotation of the screw, and is melted under the heating action of the charging barrel and the shearing and compression actions brought by the screw in the forward movement process, so that the change among three states of glass state, high elastic state and viscous state is realized. Under the condition of pressurization, the material in the viscous state passes through a die with a certain shape, then becomes a continuous body with a cross section similar to that of the die according to the die, and is cooled and shaped to form a glass state, so that the workpiece to be processed is obtained.

The screw is the heart of the extruder and is a key part of the extruder, the single screw is generally divided into three sections on the effective length, the effective length of the three sections is determined according to the diameter, the thread pitch and the screw depth of the screw and is generally divided into one third of the effective length. The last thread of the material port is a conveying section, the second section is a compression section, and the third section is a metering section. However, the material is when carrying the section, often because preheating temperature is too high and the melt film appears, influences the solid transportation volume, piles up easily at material compression section, and at the compression section, the temperature will reach material plastify degree, needs a wider temperature range change, and current extruder temperature control is not accurate enough, in addition, contains gas when extruding and leads to the degree of consistency high inadequately, influences final product quality.

Disclosure of Invention

In order to solve the problems existing in the prior art, the utility model provides a screw extruder.

The utility model provides a technical scheme that technical problem adopted as follows:

a screw extruder comprises a rack, wherein a machine barrel and a motor are fixed on the rack, one end of the machine barrel is provided with a feed inlet, the other end of the machine barrel is provided with a discharge port, the feed inlet is connected with a discharge port of a feed box, and the discharge port is connected with a machine head; a screw rod is rotated in the machine barrel and is driven to rotate by a motor, and the screw rod comprises a conveying section, a first compression section, a second compression section, a metering section and an exhaust section; the machine barrel is sequentially divided into a first heating zone, a second heating zone, a third heating zone, a fourth heating zone and a fifth heating zone from a feeding end to a discharging end, the five heating zones cover a first compression section, a second compression section, a metering section and an exhaust section of the screw, and each heating zone is respectively provided with 3-5 heating rings; the machine barrel is provided with an interlayer at one end of the feeding hole, the interlayer is provided with a water inlet and a water outlet respectively, the water inlet is connected with a main water inlet pipe through a pipeline, and the water outlet is connected with a main water outlet pipe through a pipeline.

Further, the main water inlet pipe is arranged at the position behind the bottom of the machine frame, and the main water outlet pipe is arranged along the bottom of the machine frame and connected to the ground row.

Furthermore, a valve for respectively controlling each water inlet pipeline is arranged on the main water inlet pipe.

Further, the motor is fixed at one end of the rack through the base and is positioned lower than the machine barrel, and an output shaft of the motor is connected with the screw through the transmission case.

Further, the motor is connected with the transmission case through a safety coupling, and the transmission case is connected with the screw rod through the safety coupling.

Furthermore, an upward bracket is formed at one end, far away from the motor, of the rack, a clamping groove adaptive to the shape of the bracket is formed in the machine barrel between the heating area four and the heating area five, and the bracket can be embedded into the clamping groove to lift and fix one end of the machine barrel.

Further, the conveying section accounts for 1/5-1/4 of the total length of the screw, the first compression section accounts for 2/5-1/2 of the total length of the screw, and the metering section and the exhaust section account for 1/4-2/5 of the total length of the screw.

Furthermore, the first compression section adopts single threads, the second compression section adopts double threads, the thread pitch of the single threads is larger than that of the double threads, the helix angle of the single threads is smaller than that of the double threads, and the heights of the single threads and the double threads are equal.

Further, the thread pitch of the conveying section is smaller than that of the single thread of the first compression section, the helix angle of the conveying section is smaller than that of the single thread of the first compression section, and the helix angle of the metering section is larger than that of the double thread of the second compression section.

Furthermore, the exhaust section is evenly distributed with a plurality of groups of exhaust holes along the axial direction of the screw rod, and each group of exhaust holes is evenly distributed along the circumferential direction of the screw rod of the exhaust section.

Compared with the prior art, the beneficial effects of the utility model are that:

the utility model discloses a screw extruder divide into two sections with the compression section to improve its length, and first compression section adopts the single thread, and the second compression section adopts double screw thread, and the pitch of single thread is greater than the pitch of double screw thread, and the helical angle of single thread is less than the helical angle of double screw thread, and the stupefied height of single thread and double screw thread is equal, and the material of being convenient for is carried forward, avoids piling up, has improved the conveying capacity. Meanwhile, a water jacket interlayer is arranged at one end of the feeding hole, so that the preheating or cooling effect can be realized according to the use requirement, the temperature of the conveyed material is kept below the softening point or the melting point, a molten film is avoided, the solid friction property of the material is kept, and the solid conveying amount is further improved. In addition, divide into five zone of heating with the barrel, independent control temperature makes the temperature control of barrel more accurate, guarantees the extrusion quality of plastic tubing, increases the exhaust section after the measurement section at last, can improve the degree of consistency of product with gaseous discharge in the material before extruding, guarantees final product quality.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present invention, and other drawings can be obtained by those skilled in the art according to these drawings.

Fig. 1 is a front view of a screw extruder according to an embodiment of the present invention.

Fig. 2 is a top view of a screw extruder provided by an embodiment of the present invention.

Fig. 3 is a side view of a screw extruder according to an embodiment of the present invention.

Fig. 4 is a front view of the screw rod provided by the embodiment of the present invention.

Fig. 5 is a top view of the first compression section, the second compression section, the metering section and the exhaust section of the screw according to an embodiment of the present invention.

Fig. 6 is a side view of an exhaust section of a screw according to an embodiment of the present invention.

Description of reference numerals:

1. a frame; 2. a barrel; 3. a motor; 4. a feed inlet; 5. a discharge port; 6. a first heating area; 7. a second heating area; 8. heating area three; 9. heating area four; 10. heating area five; 11. a main water inlet pipe; 12. a valve; 13. a base; 14. a transmission case; 15. a bracket; 16. a safety coupling; 17. a conveying section; 18. a first compression stage; 19. a second compression stage; 20. a metering section; 21. an exhaust section; 22. and (4) exhausting holes.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples.

As shown in fig. 1-6, the present invention provides a screw extruder, which comprises a frame 1, a cylinder 2 and a motor 3 fixed thereon.

Specifically, the motor 3 is fixed at one end of the frame 1 through a base 13 and is positioned lower than the barrel 2, and an output shaft thereof is connected with the screw through a transmission case 14. The motor 3 is connected with the transmission case 14 through a safety coupling 16, and the transmission case is connected with the screw through the safety coupling. An upward bracket 15 is formed at one end, far away from the motor 3, of the machine frame 1, a clamping groove adaptive to the shape of the bracket is formed in the machine barrel between the heating area four and the heating area five, and the bracket 15 can be embedded into the clamping groove to lift and fix one end of the machine barrel 2.

A feed inlet 4 is formed in one end of the machine barrel 2, a discharge outlet 5 is formed in the other end of the machine barrel, the feed inlet 4 is connected with a feed opening of the feeding box, and the discharge outlet 5 is connected with the machine head.

A screw is rotated in the cylinder 2 and is driven to rotate by a motor 3, and the screw comprises a conveying section 17, a first compression section 18, a second compression section 19, a metering section 20 and a gas exhaust section 21; the machine barrel 2 is sequentially divided into a first heating zone 6, a second heating zone 7, a third heating zone 8, a fourth heating zone 9 and a fifth heating zone 10 from the feeding end to the discharging end, the five heating zones cover a first compression section 18, a second compression section 19, a metering section 20 and an exhaust section 21 of the screw, and each heating zone is respectively provided with 3-5 heating rings.

The first compression section 18 adopts a single thread, the second compression section 19 adopts double threads, the thread pitch of the single thread is larger than that of the double threads, the helix angle of the single thread is smaller than that of the double threads, and the heights of the single thread and the double threads are equal.

Specifically, the pitch of the screw thread of the conveying section 17 is smaller than that of the single screw thread of the first compression section 18, and the helix angle of the screw thread of the conveying section 17 is smaller than that of the single screw thread of the first compression section 18. The helix angle of the threads of the metering section 20 is greater than the helix angle of the two threads of the second compression section 19.

The exhaust section 21 is uniformly distributed with a plurality of groups of exhaust holes 22 along the axial direction of the screw. Each group of the exhaust holes 22 is evenly distributed along the circumferential direction of the screw of the exhaust section 21. A schematic cross-sectional view of the venting section 5 with venting holes is shown in fig. 3.

The machine barrel 2 is provided with an interlayer at one end of the feed port 4, the interlayer is provided with a water inlet and a water outlet respectively, the water inlet is connected with the main water inlet pipe 11 through a pipeline, and the water outlet is connected with the main water outlet pipe through a pipeline.

Specifically, the main water inlet pipe 11 is installed at a position behind the bottom of the machine frame 1, and the main water outlet pipe is arranged along the bottom of the machine frame 1 and connected to the ground row. For the convenience of individual control, the main water inlet pipe 11 is provided with a valve 12 for respectively controlling each water inlet pipeline.

While embodiments of the invention have been disclosed above, it is not intended to be limited to the applications listed in the specification and the examples. It can be applicable to various and be fit for the utility model discloses a field completely. Additional modifications will readily occur to those skilled in the art. The invention is therefore not to be limited to the specific details and illustrations shown and described herein, without departing from the general concept defined by the claims and their equivalents.

Claims

1. A screw extruder is characterized by comprising a rack, wherein a machine barrel and a motor are fixed on the rack, one end of the machine barrel is provided with a feed inlet, the other end of the machine barrel is provided with a discharge port, the feed inlet is connected with a discharge port of a feed box, and the discharge port is connected with a machine head; a screw rod is rotated in the machine barrel and is driven to rotate by a motor, and the screw rod comprises a conveying section, a first compression section, a second compression section, a metering section and an exhaust section; the machine barrel is sequentially divided into a first heating zone, a second heating zone, a third heating zone, a fourth heating zone and a fifth heating zone from a feeding end to a discharging end, the five heating zones cover a first compression section, a second compression section, a metering section and an exhaust section of the screw, and each heating zone is respectively provided with 3-5 heating rings; the machine barrel is provided with an interlayer at one end of the feeding hole, the interlayer is provided with a water inlet and a water outlet respectively, the water inlet is connected with a main water inlet pipe through a pipeline, and the water outlet is connected with a main water outlet pipe through a pipeline.

2. Screw extruder according to claim 1, wherein the main water inlet pipe is mounted at a position behind the bottom of the frame and the main water outlet pipe runs along the bottom of the frame and is connected to the ground row.

3. Screw extruder according to claim 2, wherein the main water inlet pipe is provided with valves for controlling each water inlet line individually.

4. The screw extruder of claim 1, wherein the motor is fixed to one end of the frame by a mount and is positioned below the barrel, and the output shaft of the motor is connected to the screw by a gear box.

5. Screw extruder according to claim 4, wherein the motor is connected to a gear box via a safety coupling, and wherein the gear box is connected to the screw via a safety coupling.

6. The screw extruder of claim 1, wherein the end of the frame far away from the motor is provided with an upward bracket, a clamping groove matched with the shape of the bracket is formed on the machine barrel between the fourth heating zone and the fifth heating zone, and the bracket can be embedded into the clamping groove to lift and fix one end of the machine barrel.

7. The screw extruder of claim 1, wherein the conveying section is 1/5-1/4 of the total length of the screw, the first compression section is 2/5-1/2 of the total length of the screw, and the metering section and the venting section are 1/4-2/5 of the total length of the screw.

8. The screw extruder of claim 1, wherein the first compression stage employs a single flight and the second compression stage employs a double flight, the pitch of the single flight being greater than the pitch of the double flight, the pitch of the single flight being less than the pitch of the double flight, the pitch of the single and double flights being equal in height.

9. The screw extruder of claim 1, wherein the pitch of the conveying section flight is less than the pitch of the first compression section single flight, and the pitch of the metering section flight is greater than the pitch of the second compression section double flight.

10. The screw extruder of claim 1, wherein the vent section is uniformly distributed with a plurality of groups of vent holes along the axial direction of the screw, and each group of vent holes is uniformly distributed along the circumferential direction of the vent section screw.