PLASTIFICATION PROVIDING DEVICE AND METHOD USING AN ECCENTRIC ROBOT AND PULSED VOLUMETRIC DEFORMATION

Description

FIELD OF THE INVENTION

[0001] The present invention relates to the field of plasticating processing technology of polymer materials, particularly a volume pulsed deformation plasticating and conveying method and device by an eccentric rotor.BACKGROUND OF THE INVENTION

[0002] In polymer materials processing, the materials are all plasticated and melted by a plasticating and conveying device and delivered to a die having a specific shape to form an article. On one hand, the plasticating and conveying process of the polymer materials occupies most of the energy consumption in processing the polymer materials; on the other hand, in the plasticating and conveying process of polymer materials, it is possible to fill the polymer material matrix with different types of inorganic fillers and various plant fibers, or blend different types of polymer materials to obtain high-performance composite polymer materials, so as to meet the needs of contemporary industry development. The plasticating and conveying process of polymer materials plays a decisive role in reducing the energy consumption, improving the mixing effect of polymer materials and improving the product performance. Therefore, changing plasticating and conveying in polymer materials processing can meet the development needs of the polymer material processing technology.

[0003] Currently, the plasticating and conveying technology and equipment of polymer materials widely used at home and abroad mainly takes a screw as the core component and principle feature; however, due to the shear drag processing principle of the screw, the equipment of this structure commonly has such defects as high energy consumption, poor dispersing and mixing effects, a long thermo-mechanical distance, large-scale equipment, and hard processing of complex materials.

[0004] While the plasticating and conveying method of a polymer-material blade based on elongation rheology forces the materials to be melted, plasticated and mixed through the periodic change in the processing volume of the materials, wherein flow and deformation of the materials are mainly controlled by the tensile stress, and the principal velocity gradient is in the same direction as its principal flow and deformation, which exhibit the elongation rheology behavior, thus solving the problem that the plasticating capacity of the screw processing machinery mainly depends on the external and internal frictions of the materials. Compared with the screw plasticating and conveying method, the blade plasticating and conveying method has such advantages as low energy consumption, a short thermo-mechanical distance, high adaptability to materials, and good dispersing and mixing effects. However, in the blade plasticating and conveying process, the polymer material conveying channel is non-streamlined and has a dead end, which is not conducive to plasticization and mixed modification of the processed thermo-sensitive polymer materials.

[0005] Thus, in view of the problems with the current plasticating and conveying process, for polymer materials processing, it is of great significance to develop a new plasticating and conveying method and device with such advantages as low energy consumption, a short thermo-mechanical distance, high adaptability to materials, and good dispersing and mixing effects, with the plasticating and conveying channel streamlined, having no dead end, and easy to exhaust.

[0006] Different devices and methods in this field are for example known from US 2 694 224 A, GB 1 190 004 A, EP 2 113 355 A1, US 4 519 712 A, US 4 558 954 A, EP 2 505 335 A2 and SU 943 001 A1.CONTENTS OF THE INVENTION

[0007] For overcoming the defects of the prior art, a purpose of the present invention is to provide a volume pulsed deformation plasticating and conveying device by an eccentric rotor as well as a volume pulsed deformation plasticating and conveying method by using the device, so as to solve the problems with processing the polymer materials, i.e., a long thermo-mechanical distance experienced by the materials, high energy consumption, dead ends in the flow channel and other issues.

[0008] A technical solution of the present invention is claimed as presented in claims 1 and 5. Additional advantageous embodiments are described by the dependent claims 2 to 4.BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Fig. 1 is a schematic diagram of the structure of this volume pulsed deformation plasticating and conveying device by an eccentric rotor. Fig. 2 is a sectional view taken along Line A-A in Fig. 1. Fig. 3 is a sectional view taken along Line B-B in Fig. 1. Fig. 4 is a sectional view taken along Line C-C in Fig. 1. Fig. 5 is a schematic diagram of the motion state of the eccentric rotor in the inner cavity of the stator on the C-C section in Fig. 1. Fig. 6 is a schematic diagram of the motion state of the eccentric rotor in the inner cavity of the stator on the D-D section in Fig. 1. Fig. 7 is a schematic diagram of the structure of the plasticating injection device of the eccentric rotor. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0010] The present invention will be further described below in detail with reference to examples and drawings; however, the embodiments of the present invention are not limited thereto.Example 1

[0011] The plasticating and conveying device of this example by an eccentric rotor and having pulsed volume deformation is used as the extruding system of a plasticating extruder of the eccentric rotor.

[0012] As shown in Fig. 1, the plasticating extruder of the eccentric rotor mainly consists of a plasticating and conveying device by an eccentric rotor and having pulsed volume deformation, a transition sleeve 3, a die 4 and other parts; the plasticating and conveying device by an eccentric rotor and having pulsed volume deformation comprises a stator 1 and an eccentric rotor 2 disposed in the inner cavity of the stator 1; the transition sleeve 3 is connected to the stator 1, and the die 4 is connected to the transition sleeve 3. The eccentric rotor comprises multiple alternatingly disposed eccentric spiral segments and eccentric straight segments of the rotor; the inner cavity of the stator comprises multiple alternatingly disposed spiral segments and straight segments of the stator; and the eccentric spiral segments and the eccentric straight segments of the rotor correspond one-to-one with the spiral segments and straight segments of the stator. Wherein changes of different sections are as shown in Fig. 2, 3 or 4 when the eccentric spiral segments of the rotor is connected with the spiral segments of the stator. In the feeding direction of the materials, the pitch of the eccentric spiral segments of the rotor and the spiral segments of the stator are gradually reduced.

[0013] As shown in Fig. 5 or 6, the radial sections of the spiral segments and the straight segments of the inner cavity of the stator are long holes, and the eccentric rotor reciprocates in the long hole of the inner cavity of the stator, with the motion stroke being twice the maximum eccentricity of the eccentric rotor. The rotation of the eccentric rotor and the rolling of the rotor in the inner cavity of a stator during constant reverse revolutions cause the volume of the space between the eccentric rotor and the stator to periodically change alternatively along the axial direction and the radial direction of the stator, and the materials between the stator and the eccentric rotor receive the pulsed volume deformation when cyclically compressed and released, thus completing the plasticating and conveying process including solid compacting, exhausting, melt plasticating, mixing, and melt delivering.

[0014] This example can achieve a volume pulsed deformation plasticating and conveying method by an eccentric rotor through the above device, wherein the rotation of the eccentric rotor and the rolling of the rotor in the inner cavity of a stator during constant reverse revolutions cause the volume of the material between the eccentric rotor and the stator to periodically change alternatively along the axial direction and the radial direction of the stator, thereby enabling the volume pulsed deformation plasticating and conveying of the material . The material, after plasticated by the volume pulsed deformation plasticating and conveying device by an eccentric rotor, is extruded by a die 4 connected to the transition sleeve 3, cooled, and shaped to produce an article.Example 2

[0015] The volume pulsed deformation plasticating and conveying device of this example by an eccentric rotor is combined with an injection unit to form a plasticating injection device of the eccentric rotor.

[0016] This example is different from Example 1 in the follow aspect: As shown in Fig. 7, the output end of the stator is connected to a cylinder 6 of the injection unit through an accumulator 5, and the inner cavity of the stator is communicated with the injection channel in the cylinder, with a plunger 7 provided in the injection channel.

[0017] While in use, this volume pulsed deformation plasticating and conveying device by an eccentric rotor plasticates and melts the material, and delivers it into the injection channel of the cylinder, with the plunger constantly moving backward. When the storage amount of the polymer material melt in the cylinder reaches the measured value required by the injection products, this volume pulsed deformation plasticating and conveying device by an eccentric rotor stops plasticating and melting, and the plasticating measuring process of the injection machine is ended. After the injection machine completes the processes of filling the die and retaining the pressure, the plasticating extruder of the eccentric rotor begins to plasticize in the cooling stage of the product, with the injection machine starting a new cycle of molding products.

[0018] The present invention can be well implemented as described above. The examples as described above are only the preferred examples of the present invention, and are not intended to limit the scope of the present invention; that is, it is intended that variations and modifications consistent with the present invention be encompassed by the scope of the present invention as defined by the appended claims.

Claims

1. A device for pulsed plasticating and conveying a material, characterized in that: the device comprises a stator (1) and an eccentric rotor (2) disposed in a inner cavity of the stator (1); wherein the eccentric rotor (2) comprises multiple alternatingly disposed eccentric spiral segments and eccentric straight segments; wherein the inner cavity of the stator (1) comprises multiple alternatingly disposed spiral segments and straight segments; wherein the eccentric spiral segments of the rotor (2) correspond one-to-one with the spiral segments of the stator (1), and the eccentric straight segments of the rotor (2) correspond one-to-one with the straight segments of the stator (1); wherein in the inner cavity of the stator (1), the radial sections of the spiral segments and the straight segments of the stator (1) are long holes; and wherein the eccentric rotor (2) is designed to rotate and reciprocate in the long hole of the inner cavity of the stator (1), with a motion stroke being twice a maximum eccentricity of the eccentric rotor (2), to cause a volume of the material between the eccentric rotor (2) and the stator (1) to periodically change alternatively along an axial direction and a radial direction of a stator (1) and thereby plasticate and convey the material.

2. The volume pulsed deformation plasticating and conveying device by an eccentric rotor (2) according to claim 1, characterized in that: in the feeding direction of the materials, the pitch of the respective eccentric spiral segments of the rotor (2) on the eccentric rotor is gradually reduced, and so is the pitch of the respective spiral segments of the stator (1) in the inner cavity of the stator (1).

3. The volume pulsed deformation plasticating and conveying device by an eccentric rotor (2) according to claim 1, characterized in that: the volume pulsed deformation plasticating and conveying device by an eccentric rotor (2) is used as an extruding system of an extruder.

4. The volume pulsed deformation plasticating and conveying device by an eccentric rotor (2) according to claim 1, characterized in that: the volume pulsed deformation plasticating and conveying device by an eccentric rotor (2) is combined with a plunger injection unit to form a plasticating injection device of an injection molding machine.

5. A volume pulsed deformation plasticating and conveying method by an eccentric rotor (2) by using the device according to claim 1, characterized in that: the rolling effect of the eccentric rotor (2) in the inner cavity of the stator (1), during rotations of the eccentric rotor (2) and during constant speed reverse rotations of the eccentric rotor (2), cause the volume of materials between the eccentric rotor (2) and the stator (1) to periodically change alternatively along the axial direction and the radial direction of the stator (1) during the conveying process, thereby enabling the volume pulsed deformation plasticating and conveying of the materials.