CN105904699A - Outer thread groove type screw extruding device with vibration spindle - Google Patents

Abstract

The invention relates to an external screw groove type screw extrusion device with a vibrating mandrel, comprising an extruder head, a barrel, a hollow screw, a hopper, a seat, a centripetal thrust bearing group, a transmission mechanism, a motor, and a fixed seat , gears, electric heating coils and mandrels; the hollow screw is located in the barrel and can rotate, and the outer surface of the hollow screw is provided with a full-length and continuous external thread groove, the mandrel is located in the center hole of the hollow screw, and the hollow screw Rotatable relative to the mandrel, the barrel, hollow screw and mandrel are all coaxial; the feature is that it also includes a vibration device and a motion controller, the vibration device is set on the mandrel, the motion controller controls the vibration of the vibration device, and the vibration device drives the mandrel Axial vibration or circular vibration or simultaneous axial vibration and circular vibration, or the vibrating device drives the mandrel to perform circular rotation. Vibration strengthens the mass transfer, heat transfer and homogenization of the molten material, the mixing and shearing of the material is strengthened, and the quality of the produced product is good.

Description

External channel screw extrusion unit with vibrating mandrel

technical field

The invention relates to an external screw groove type screw extrusion device with a vibrating mandrel, which is mainly used for plasticizing and extruding various materials, especially polymer materials, and belongs to the technical field of material plasticizing extrusion molding equipment.

Background technique

The material extrusion molding device is an important equipment for material processing and molding. After the solid material enters the space of the barrel and the screw groove through the hopper, it moves forward under the push of the screw flight. A series of processes, its shape changes from the initial solid state to a molten state through plug flow, melt film, circulation, solid phase crushing, etc.

Among the many forms of screw extruders, the single-screw extruder is the earliest and the most widely used one. After years of development, the single-screw extruder itself has also been changed and improved. The existing single-screw extruder Extruders, whether they are ordinary single-screw extruders or conical single-screw extruders, have the characteristics of simple structure, convenient operation, and relatively low production costs.

Relying on traditional extruders, many researchers have conducted a lot of exploration, and some of them have introduced vibration into the field of plastic processing and molding.

Some researchers optimize the extrusion process by using the vibration of the screw on the plasticizing extrusion process of the material, and improve the processing process and the quality of the extruded product by applying vibration to the screw during the plasticizing extrusion process.

Some researchers use the vibration of plunger or piston to optimize the plasticizing, extrusion and injection process. Foreign literature ^[1,2] introduced the rheological injection molding machine developed by it. The polymer melt is first injected into the vibrating chamber from the barrel under the action of the screw, the direction of the valve is switched, and the vibration is applied by the piston. Then it is injected into the mold cavity by the piston, and while maintaining the pressure, the melt continues to be subjected to pressure vibration before the gate of the mold freezes.

In order to further improve the plasticizing extrusion process and improve product quality, it is necessary to change the vibration mode of the extruder in the traditional sense, introduce vibration in the extrusion process in a new way, further strengthen its function and simplify its structure.

references:

[1 Ibar JP. Control of polymer properties by melt vibration technology: a review. Polymer Engineering and Science. 1998;38(1):1-20

[2] A. Minardi, M. Boudeulle, E. Duval, S Etienne. Effect of the molding conditions on the semicrystalline structure of polypropylene. Polymer. 1997,38(15):3957-3965.

Contents of the invention

The purpose of the present invention is to overcome the deficiencies of the prior art and provide an external screw groove type screw extrusion device with a vibrating mandrel with simple structure, reliable operation, low manufacturing, use and maintenance costs, and good product quality.

In order to achieve the above object, the present invention is achieved in this way, which is an external screw groove screw extrusion device with a vibrating mandrel, including an extruder head, a barrel, a hollow screw, a hopper, a seat, and a centripetal thrust Bearing group, transmission mechanism, motor, fixed seat, gear, electric heating ring and mandrel; wherein the hollow screw is located in the barrel and can rotate, and the outer surface of the hollow screw is provided with a continuous external thread that runs through the entire length groove, the mandrel is located in the central hole of the hollow screw, the hollow screw can rotate relative to the mandrel, and the barrel, the hollow screw and the mandrel are all coaxial; it is characterized in that it also includes a vibration device and a motion controller. The vibrating device is arranged between the fixed seat frame and the mandrel, and the motion controller controls the vibrating device to vibrate, and the vibrating device drives the mandrel to perform the following movements: axial vibration, circular vibration, simultaneous axial vibration and circular vibration, or vibration The device drives the mandrel to make a circular motion.

In this technical solution, the shape of the hollow screw is cylindrical or conical or other shapes.

In this technical solution, the vibrating device is an ultrasonic vibrating device or a mechanical vibrating device or an electric vibrating device

Magnetic vibrating device or hydraulic vibrating device or pneumatic vibrating device or their combination.

Compared with the prior art, the present invention has the following advantages:

1. After the material is plasticized and enters the extrusion stage, the vibration of the mandrel is beneficial to the mass transfer, heat transfer and homogenization of the melt, which reduces the effective viscoelasticity and viscosity of the plastic melt, increases the fluidity, and the mixing shear of the material Cut strengthening can significantly improve the performance of the molded product. Through the mechanical properties, DSC and density tests of the extruded product after the vibration is applied, it is found that the tensile and impact strength of the product increases, the density becomes larger, and the crystallinity of the sample increases. The internal quality and appearance quality of the products have been greatly improved and enhanced.

2. Compared with other vibration methods in plastic processing and molding, the "mandrel vibration" method has the advantages of simple structure and reliable operation, and lower manufacturing, use and maintenance costs.

Description of drawings

Fig. 1 is a schematic structural view of Embodiment 1 of the present invention;

Fig. 2 is a schematic structural view of a hollow screw according to Embodiment 1 of the present invention;

Fig. 3 is a schematic structural diagram of Embodiment 2 of the present invention;

Fig. 4 is a schematic structural view of the hollow screw of the second embodiment of the present invention.

detailed description

The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings. It should be noted here that the descriptions of these embodiments are used to help understand the present invention, but are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below may be combined with each other as long as they do not constitute a conflict with each other.

In the description of the present invention, the orientations or positional relationships indicated by the terms "left" and "right" are based on the orientations or positional relationships shown in the drawings, which are only for the convenience of describing the present invention and do not require that the present invention must be based on a specific orientation. construction and operation, therefore, should not be construed as limiting the invention.

In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only, and should not be understood as indicating or implying relative importance.

Embodiment one

As shown in Figure 1 and Figure 2, it is an external screw groove screw extrusion device with a vibrating mandrel, including an extruder head 1, a barrel 2, a hollow screw with an external thread groove 3, a hopper 4, Seat 5, centripetal thrust bearing group 6, transmission mechanism 7, motor 8, vibration device 9, fixed seat frame 10, motion controller 11, gear 12, electric heating coil 13 and mandrel 14;

The extruder head 1 is installed on the right end of the barrel 2, which is the discharge port of the barrel 2, and the discharge port of the barrel 2 is connected with the extruder head 1; the hopper 4 is installed on the left end of the barrel 2, that is, the The feed port of the barrel 2, the feed port of the barrel 2 is connected with the hopper 4; the electric heating coil 13 is sleeved on the entire barrel 2;

The hollow screw 3 is located in the barrel 2 and can rotate. The outer surface of the hollow screw 3 is provided with a continuous external thread groove 301 that runs through the entire length. The left end of the hollow screw 3 extends outside the barrel 2. The hollow screw 3 The left end of 3 is installed on the seat 5 rotatingly, the left end of the external thread groove 301 on the outer surface of the hollow screw 3 communicates with the feed port of the hopper 4, and the right end of the external thread groove 301 on the outer surface of the hollow screw 3 is connected to the material. The discharge port of barrel 2 is connected;

The centripetal thrust bearing group 6 and the gear 12 are respectively set on the left end of the hollow screw 3, the gear 12 drives the hollow screw 3 to rotate, the motor 8 drives the transmission mechanism 7, the transmission mechanism 7 drives the gear 12, and the hollow screw 3 is provided with a center Holes; in the present embodiment, the shapes of the barrel 2 and the hollow screw 3 are cylindrical;

The mandrel 14 is located in the center hole of the hollow screw 3, the hollow screw 3 is rotatable relative to the mandrel 14, the left end of the mandrel 14 stretches out of the center hole of the hollow screw 3, and the vibrating device 9 is installed on the left end of the mandrel 14 Between the fixed seat frame 10, the barrel 2, the hollow screw 3 and the mandrel 14 are all coaxial;

The vibrating device 9 drives the mandrel 14 to vibrate, and the motion controller 11 controls the vibration of the vibrating device 9; the vibrating device 9 can drive the mandrel 14 to move as follows: axial vibration, circular vibration, axial vibration and circular vibration, or vibration The device 9 drives the mandrel 14 to perform circular rotation; the vibration device 9 is an ultrasonic vibration device, a mechanical vibration device, an electromagnetic vibration device, a hydraulic vibration device or a pneumatic vibration device, or a combination of the above methods .

When working, the motor 8 drives the hollow screw 3 to rotate through the transmission mechanism 7 and the gear 12, and the material enters the external thread groove of the hollow screw 3 from the hopper 4 through the barrel 1, and moves along the external thread groove to the extruder under the push of the screw edge. Out of the extruder head 1, at the same time, the vibrating device 9 drives the mandrel 14 to vibrate or rotate, and the vibration is applied to the molten material at the front end of the barrel 2, and the vibrated molten material finally passes through the extruder head 1, and then cooled and shaped.

Embodiment two

As shown in Fig. 3 and Fig. 4, it is a kind of external screw groove type screw extrusion device with a vibrating mandrel, its structure is basically the same as that of Embodiment 1, the difference is that in this embodiment, barrel 2 and The shape of the hollow screw 3 is conical; its working principle is similar to that of Embodiment 1, and will not be repeated here.

The embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. For those skilled in the art, various changes, modifications, substitutions and deformations to these implementations without departing from the principle and spirit of the present invention still fall within the protection scope of the present invention.

Claims (3)

1. An external screw groove screw extrusion device with vibrating mandrel, including extrusion head (1), barrel (2), hollow screw (3), hopper (4), seat (5), Centripetal thrust bearing group (6), transmission mechanism (7), motor (8), fixed seat frame (10), gear (12), electric heating coil (13) and mandrel (14); wherein the hollow screw ( 3) Located in the barrel (2) and rotatable, the outer surface of the hollow screw (3) is provided with a continuous external thread groove (301) that runs through the entire length, and the mandrel (14) is located on the hollow screw (3) In the central hole of the hollow screw (3) is rotatable relative to the mandrel (14), and the barrel (2), the hollow screw (3) and the mandrel (14) are all coaxial; it is characterized in that it also includes a vibration device ( 9) and a motion controller (11), the vibration device (9) is arranged between the fixed mount (10) and the mandrel (14), and the motion controller (11) controls the vibration of the vibration device (9), The vibrating device (9) drives the mandrel (14) to vibrate axially or circularly or simultaneously, or the vibrating device (9) drives the mandrel (14) to vibrate in a circular motion. 2. The external groove type screw extrusion device with vibrating mandrel according to claim 1, characterized in that the shape of the hollow screw (3) is cylindrical or conical or other shapes. 3. The external screw groove screw extrusion device with a vibrating mandrel according to claim 1, characterized in that the vibrating device (9) is an ultrasonic vibrating device or a mechanical vibrating device or an electromagnetic vibrating device or a hydraulic vibrating device. Type vibrating device or pneumatic vibrating device or their combination.