CN214448354U

CN214448354U - Mouth shape structure of screw extruder

Info

Publication number: CN214448354U
Application number: CN202022914890.0U
Authority: CN
Inventors: 丁日成; 陈龙; 李忠涛
Original assignee: Wuxi No2 Rubber Co ltd
Current assignee: Wuxi No2 Rubber Co ltd
Priority date: 2020-12-07
Filing date: 2020-12-07
Publication date: 2021-10-22
Anticipated expiration: 2030-12-07

Abstract

The utility model relates to a mouth shape structure of a screw extruder, which comprises a machine head body, wherein a flow passage body is arranged in the machine head body, and an adjusting sleeve is fixedly arranged at the end part of the machine head body through a pressing sleeve; a machine core and a mouth shape are arranged in the adjusting sleeve, and the inner end of the machine core is in threaded connection with the flow channel body; the end part of the adjusting sleeve is in threaded connection with an adjusting nut, the inner side of the adjusting nut abuts against the mouth shape, and the opening size between the mouth shape and the machine core can be changed by rotating the adjusting nut, so that the wall thickness of the extruded material is adjusted; the outlet section of the machine core is provided with a transition step for improving the material extrusion roundness. The utility model discloses shorten mouth type length to make inside cone angle grow, shorten the length of core simultaneously, mouth type cone angle grow has improved smoothness and extrusion speed, and semi-manufactured goods surface is more smooth, and compactness is better.

Description

Mouth shape structure of screw extruder

Technical Field

The utility model relates to a screw extruder's mouth type structure belongs to screw extrusion equipment technical field.

Background

Extrusion molding is a process of continuously pressing and conveying a sizing material with certain plasticity out through a die under certain conditions to form a product with a certain section shape. During the forward movement of the rubber compound along the screw, the viscosity, plasticity and the like of the rubber compound are changed to a certain extent as a result of mechanical action and thermal action, so that the rubber compound becomes a viscous fluid. According to the variation of the rubber compound in the extrusion process, the working part of the screw is generally divided into three parts of a feeding section, a compression section and an extrusion section according to the different functions of the screw.

The working characteristics of each section are as follows:

1. a feeding section: this phase starts from the feed opening and the melting of the gum material begins. After the rubber material enters the feeding port, the rubber material moves relatively between the thread groove and the inner wall of the machine barrel under the pushing action of the rotary screw, and a rubber cluster with a certain size is formed.

2. A compression section: this stage starts from the start of the melting of the compound to the end of the flow of the whole compound. The compression section receives the rubber mass from the feeding section, compacts the rubber mass, softens the rubber mass further, and discharges air entrained in the rubber mass to the feeding section.

3. Extruding section: the sizing material conveyed from the compression section is further pressurized and stirred, and the sizing material in a completely flowing state is formed in the thread groove. The rotation of the screw promotes the rubber to flow and uniformly extrude out of the flow channel of the machine head with certain volume and pressure.

The flow of the rubber compound in the screw thread groove is spirally advanced, but when the rubber compound is discharged from the screw head end and enters the machine head flow channel, the material flow shape is changed rapidly, namely the rubber compound is changed from rotary motion to linear motion, and the flow speed of the rubber compound is much higher in the center of the flow channel than in the position close to the inner wall of the machine head due to certain viscosity, and the speed distribution of the rubber compound is parabolic.

Head pressure: the pressure on the material formed in the flow channel of the head gradually decreases as it passes through the head. As the material exits the die, it drops to zero.

In the production of the turbocharging pipe, the outer layer is extruded by using a T-shaped machine head, and the extrusion pressure is often higher in the actual production, so that the pressure alarm is easy to occur, and the extrusion speed is difficult to improve.

Disclosure of Invention

An object of the utility model is to overcome exist not enough among the prior art, provide a screw extruder's mouth shape structure, shorten mouth shape length to make inside cone angle grow, shorten the length of core simultaneously, mouth shape cone angle grow has improved smoothness and extrusion speed, and semi-manufactured goods surface is more smooth, and compactness is better.

According to the utility model provides a technical scheme: a mouth shape structure of a screw extruder comprises a machine head body, wherein a flow channel body is arranged in the machine head body, and an adjusting sleeve is fixedly arranged at the end part of the machine head body through a pressing sleeve; a machine core and a mouth shape are arranged in the adjusting sleeve, and the inner end of the machine core is in threaded connection with the flow channel body; the end part of the adjusting sleeve is in threaded connection with an adjusting nut, the inner side of the adjusting nut abuts against the mouth shape, and the opening size between the mouth shape and the machine core can be changed by rotating the adjusting nut, so that the wall thickness of the extruded material is adjusted; the outlet section of the machine core is provided with a transition step for improving the material extrusion roundness.

Further, the length of the mouth is 28-32mm, and the taper angle of the inner side extrusion surface of the mouth is 120-122 degrees.

Further, the length of the movement is 125-127mm, and the taper angle of the outer side extrusion surface of the movement is 44-45 degrees.

Further, the length of the transition step is 2.5-3.5 mm.

Further, the machine head body and the pressing sleeve are fixed through bolts.

Compared with the prior art, the utility model, have following advantage:

1. the length of the die is shortened, so that the inner cone angle is increased, the length of the machine core is shortened, the larger the angle of the taper angle of the die is, the higher the smoothness is, the higher the extrusion speed is, the smoother the surface of a semi-finished product is, and the better the compactness is.

2. The head of the machine core is additionally provided with a section of transition step, so that the extrusion roundness is improved. Therefore, the extrusion pressure can be obviously reduced effectively, the surface of an extruded product is smooth, the extrusion speed is improved, and the production efficiency is improved.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a schematic structural diagram of the movement.

Fig. 3 is a schematic structural view of the die.

Description of reference numerals: 1-machine head body, 2-flow channel body, 3-adjusting sleeve, 4-pressing sleeve, 5-adjusting nut, 6-machine core, 7-mouth shape and 8-transition step.

Detailed Description

The present invention will be further explained with reference to the accompanying drawings.

As shown in fig. 1, 2 and 3, a mouth-shaped structure of a screw extruder comprises a head body 1, a flow channel body 2 is arranged in the head body 1, an adjusting sleeve 3 is fixedly mounted at the end of the head body 1 through a pressing sleeve 4, and the head body 1 and the pressing sleeve 4 are fixed through bolts; a machine core 6 and a mouth shape 7 are arranged in the adjusting sleeve 3, and the inner end of the machine core 6 is in threaded connection with the flow channel body 2; the end part of the adjusting sleeve 3 is in threaded connection with an adjusting nut 5, the inner side of the adjusting nut 5 abuts against the mouth shape 7, and the opening size between the mouth shape 7 and the machine core 6 can be changed by rotating the adjusting nut 5 so as to adjust the wall thickness of the extruded material; the outlet section of the machine core 6 is provided with a transition step 8 for improving the material extrusion roundness.

The length of the mouth die 7 is 28-32mm, the taper angle of the inner side extrusion surface of the mouth die 7 is 120-122 degrees, and the length of the prior mouth die 7 is 60 mm.

The length of the movement 6 is 125-127mm, the taper angle of the outer side extrusion surface of the movement 6 is 44-45 degrees, and the length of the conventional movement 6 is 137 mm.

The length of the transition step 8 is 2.5-3.5 mm.

The length of the mouth 7 is shortened, so that the inner cone angle is increased, meanwhile, the length of the outer-layer machine core 6 is shortened, the larger the cone angle of the mouth 7 is, the higher the smoothness is, the faster the extrusion speed is, the smoother the surface of a semi-finished product is, the better the compactness is, the head is added with a section of transition step 8, and the extrusion roundness is improved. Therefore, the extrusion pressure can be obviously reduced effectively, the surface of an extruded product is smooth, the extrusion speed is improved, and the production efficiency is improved.

It is to be understood that the above embodiments are merely exemplary embodiments that have been employed to illustrate the principles of the present invention, and that the present invention is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.

Claims

1. The mouth shape structure of the screw extruder is characterized by comprising a machine head body (1), wherein a flow channel body (2) is arranged in the machine head body (1), and an adjusting sleeve (3) is fixedly installed at the end part of the machine head body (1) through a pressing sleeve (4); a machine core (6) and a mouth shape (7) are arranged in the adjusting sleeve (3), and the inner end of the machine core (6) is in threaded connection with the flow channel body (2); the end part of the adjusting sleeve (3) is in threaded connection with an adjusting nut (5), the inner side of the adjusting nut (5) is abutted against the mouth-shaped part (7), and the opening size between the mouth-shaped part (7) and the machine core (6) can be changed by rotating the adjusting nut (5) so as to adjust the wall thickness of the extruded material; the outlet section of the machine core (6) is provided with a transition step (8) for improving the material extrusion roundness.

2. A die structure for a screw extruder according to claim 1, wherein the length of the die (7) is 28-32mm, and the taper angle of the extrusion surface on the inside of the die (7) is 120-122 °.

3. A die structure of a screw extruder according to claim 1, wherein the length of the core (6) is 125-127mm, and the taper angle of the extrusion surface on the outer side of the core (6) is 44-45 °.

4. Screw extruder die structure according to claim 1, wherein the length of the transition step (8) is 2.5-3.5 mm.

5. The die structure of a screw extruder according to claim 1, wherein the head body (1) and the pressing sleeve (4) are fixed by bolts.