Extrusion structure of parallel double-screw extruder

Abstract

The utility model discloses an extrusion structure of a parallel double-screw extruder, which comprises an extruder body and a machine body, an extrusion barrel is arranged on the machine body, two screw rods are rotatably mounted in the extrusion barrel in parallel, and an annular heating plate is arranged in the side wall of the extrusion barrel; the screw rod comprises a first screw part and a second screw part; the utility model relates to the technical field of plastic processing, when in use, along with the advancing of raw materials in the screw rod, the annular heating plate on the extrusion cylinder heats the raw materials, and meanwhile, the rotation of the screw rod generates shearing and friction heat on the materials, so that the materials are converted into a molten state from a solid state, and meanwhile, the extrusion efficiency is improved. The heating assembly is started to heat the first spiral part of the spiral rod, the first spiral part is used for heating the interior of the extrusion barrel, the contact area with the plastic particles is increased, the heating uniformity of the plastic particles is improved, and the plasticizing efficiency of the plastic particles is effectively improved through double heating.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of plastics processing, and specifically to an extrusion structure of parallel double-screw extruder. BACKGROUND

[0002] The parallel double-screw extruder is widely used in filling, blending, modification, enhancement, devolatilization treatment of chlorinated polypropylene and high water-absorbing resin of rubber and plastic and engineering resin, extrusion of degradable master batch, polyamide polycondensation and polyurethane polyaddition reaction, granulation of carbon powder and magnetic powder, preparation of insulating material, sheath material, low-smoke low-halogen flame-retardant PVC cable material and various silane crosslinking materials for cables and the like.

[0003] At present, in the processing of plastics, a processing method is used to make various cross-section products or semi-products by continuously passing through the head through the action of plastic particles between the extrusion cylinder and the screw, being heated and plasticized and being pushed forward by the screw, but the existing extruder generally only installs a heating device on the extrusion cylinder, and a large number of plastic particles entering the extrusion cylinder can easily cause uneven heating of the plastic particles and low plasticizing efficiency, therefore, the extrusion structure of the parallel double-screw extruder is provided. SUMMARY

[0004] The utility model discloses a kind of extrusion structures of parallel double-screw extruder, to solve the problem of the existing extruder generally only installs heating device on extrusion cylinder, and a large number of plastic particles entering extrusion cylinder can easily cause uneven heating of the plastic particles and low plasticizing efficiency.

[0005] To achieve the above object, the utility model provides the following technical scheme: an extrusion structure of parallel double-screw extruder, comprising:

[0006] The extruder body includes a machine body, an extrusion cylinder is provided on the machine body, two screw rods are installed in parallel in the extrusion cylinder, and a plurality of annular heating plates are evenly distributed in the sidewall of the extrusion cylinder.

[0007] The screw rod includes a first spiral part near the feeding end of the extrusion cylinder and a second spiral part near the discharging end of the extrusion cylinder.

[0008] The first spiral part is provided with a heating assembly.

[0009] Preferably, the heating assembly includes a spiral cavity provided in the spiral blade of the first spiral part, a spiral heat conduction plate is arranged in the spiral cavity, an electric heating wire is arranged along the inner wall of the spiral heat conduction plate, and an electrical connection structure is arranged at one end of the electric heating wire.

[0010] Preferably, the electric connection structure comprises a conductive slip ring connectable with an external power source, an end of the screw rod is provided with a first connecting joint rotatably installed in the conductive slip ring, and a connecting end of the electric heating wire is provided with a second connecting joint.

[0011] Preferably, the extruder body further comprises a driving structure arranged on the body and used for simultaneously driving the two screw rods to rotate.

[0012] The driving structure comprises two transmission rollers arranged at the ends of the rotation shafts of the two screw rods, the two transmission rollers are connected by a belt transmission, a first gear is arranged on one of the transmission rollers, and a driving motor is arranged on the body and provided with a second gear meshingly connected with the first gear.

[0013] Compared with the prior art, the extrusion structure of the parallel double-screw extruder has the following beneficial effects: when a large amount of plastic particles enter the extrusion cylinder, the annular heating plate on the extrusion cylinder heats the raw materials while the screw rod rotates to generate shear and friction heat on the materials, so that the materials are converted from a solid state to a molten state, the first screw part of the screw rod is heated by starting the heating assembly, the contact area with the plastic particles is increased by heating the first screw part in the extrusion cylinder, the uniformity of heating the plastic particles is improved, and the plasticizing efficiency of the plastic particles is effectively improved by double heating. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is a main sectional view of the utility model;

[0015] Figure 2 It is a main sectional view of the driving structure of the utility model;

[0016] Figure 3 It is Figure 1 It is a schematic view of the local enlarged structure of A.

[0017] In the figure: 1, body; 2, extrusion cylinder; 3, screw rod; 3-1, first screw part; 3-2, second screw part; 4, heating assembly; 4-1, screw cavity; 4-2, screw heat conduction plate; 4-3, electric heating wire; 4-4, electric connection structure; 4-4-1, conductive slip ring; 4-4-2, first connecting joint; 4-4-3, second connecting joint; 5, annular heating plate; 6, driving structure; 6-1, transmission roller; 6-2, first gear; 6-3, driving motor; 6-4, second gear. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0019] See also Figures 1-3 The utility model provides a technical solution: an extrusion structure of a parallel twin-screw extruder, including an extruder body 1, a machine body 1 is provided with an extrusion barrel 2, two screw rods 3 are installed in the extrusion barrel 2 for parallel rotation, and a plurality of evenly distributed annular heating plates 5 are provided in the side wall of the extrusion barrel 2; the screw rod 3 includes a first spiral portion 3-1 near the feeding end of the extrusion barrel 2 and a second spiral portion 3-2 near the discharging end of the extrusion barrel 2; a heating component 4 is provided on the first spiral portion 3-1. When in use, after a large amount of plastic particles enter the extrusion barrel 2, as the raw materials advance in the screw rod 3, the annular heating plate 5 on the extrusion barrel 2 heats the raw materials. At the same time, the rotation of the screw rod 3 generates shear and friction heat on the material, causing the material to change from a solid state to a molten state. At the same time, the heating component 4 is started to heat the first spiral portion 3-1 of the screw rod 3, and the first spiral portion 3-1 is heated inside the extrusion barrel 2, thereby increasing the contact area with the plastic particles, improving the uniformity of heating the plastic particles, and effectively improving the plasticizing efficiency of the plastic particles through double heating.

[0020] Specifically, the heating component 4 includes a spiral cavity 4-1 arranged in the spiral blades on the first spiral portion 3-1, a spiral heat conduction plate 4-2 is provided inside the spiral cavity 4-1, and a heating wire 4-3 is provided along the inner wall of the spiral heat conduction plate 4-2. An electrical connection structure 4-4 is provided at one end of the heating wire 4-3. When in use, the heating wire 4-3 is powered by the electrical connection structure 4-4, so that the heating wire 4-3 generates heat energy. The heat energy generated by the heating wire 4-3 transfers heat to the spiral blades of the first spiral portion 3-1 through the heat conduction plate 4-2. The plastic particles are heated by the heated spiral blades, thereby increasing the contact area with the plastic particles and improving the uniformity of heating the plastic particles.

[0021] Specifically, the electrical connection structure 4-4 includes a conductive slip ring 4-4-1 connectable to an external power source, the end of the screw rod 3 is provided with a first connecting joint 4-4-2 rotatably mounted in the conductive slip ring 4-4-1, and the connecting end of the heating wire 4-3 is provided with a second connecting joint 4-4-3, the first connecting joint 4-4-2 and the second connecting joint 4-4-3 are electrically connected by wires, in use, the conductive slip ring 4-4-1 is connected to an external power source, so that the power source supplies power to the second connecting joint 4-4-3 through the first connecting joint 4-4-2 through the wires, and the heating wire 4-3 is heated by the second connecting joint 4-4-3 to generate heat, and the electrical connection structure 4-4 supplies power to the heating wire 4-3 to generate heat.

[0022] Specifically, the extruder body further includes a driving structure 6 arranged on the machine body 1 for simultaneously driving the two screw rods 3 to rotate, and the two screw rods 3 are simultaneously rotated to extrude, shear and mix the material, and due to the meshing relationship, a complex flow channel is formed in the gap of the screw rod, so that the material is more fully stirred and plasticized.

[0023] Working principle: when the utility model works, when a large number of plastic particles enter the extrusion barrel 2, start the driving structure 5 to drive the two screw rods 3 to rotate, with the advancement of the raw material in the screw rod 3, the annular heating plate 5 on the extrusion barrel 2 heats the raw material, and the rotation of the screw rod 3 produces shear and friction heat on the material, so that the material changes from solid to molten state at the same time, and the heating assembly 4 is started to heat the first screw part 3-1 of the screw rod 3, so that the inside and outside of the extrusion barrel 2 are heated, and the plasticizing efficiency of the plastic particles is accelerated.

[0024] In the description of the application, unless otherwise clearly specified and limited, the terms "mounting", "connection", "connecting", "fixing" should be understood broadly, for example, can be fixed connection, can also be detachable connection, or integral; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship of two elements. For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0025] The standard parts used in the application can be purchased from the market, and the special-shaped parts can be ordered according to the description and the drawings. The specific connection mode of each part adopts the conventional means such as bolt, rivet and welding in the prior art. The machinery, parts and equipment adopt the conventional type in the prior art, and the circuit connection adopts the conventional connection mode in the prior art, which will not be described in detail here.

[0026] Although the embodiments of the application have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and spirits of the application, and the scope of the application is defined by the appended claims and their equivalents.

Claims

1. An extrusion structure of a parallel twin-screw extruder, characterized in that: include: The extruder body comprises a machine body (1), wherein the machine body (1) is provided with an extrusion barrel (2), two screw rods (3) are installed in parallel and rotate in the extrusion barrel (2), and a plurality of evenly distributed annular heating plates (5) are provided in the side wall of the extrusion barrel (2); The screw rod (3) comprises a first screw portion (3-1) close to the feed end of the extrusion barrel (2) and a second screw portion (3-2) close to the discharge end of the extrusion barrel (2); A heating component (4) is provided on the first spiral portion (3-1).

2. The extrusion structure of a parallel twin-screw extruder according to claim 1, characterized in that: The heating component (4) comprises a spiral cavity (4-1) arranged in a spiral blade on a first spiral portion (3-1), a spiral heat conducting plate (4-2) being provided inside the spiral cavity (4-1), a heating wire (4-3) being provided along the inner wall of the spiral heat conducting plate (4-2), and an electrical connection structure (4-4) being provided at one end of the heating wire (4-3).

3. The extrusion structure of a parallel twin-screw extruder according to claim 2, characterized in that: The electrical connection structure (4-4) comprises a conductive slip ring (4-4-1) that can be connected to an external power source; the end of the spiral rod (3) is provided with a first connection joint (4-4-2) that is rotatably mounted in the conductive slip ring (4-4-1); the connection end of the heating wire (4-3) is provided with a second connection joint (4-4-3); and the first connection joint (4-4-2) and the second connection joint (4-4-3) are connected by an electric wire.

4. The extrusion structure of a parallel twin-screw extruder according to claim 1, characterized in that: The extruder body further comprises a driving structure (6) provided on the body (1) for simultaneously driving the two screw rods (3) to rotate; The driving structure (6) comprises a transmission roller (6-1) provided on the extruder (2) with the rotating shaft ends of two screw rods (3) extending therefrom. The two transmission rollers (6-1) are connected by a belt transmission. A first gear (6-2) is provided on one side of the transmission roller (6-1). A driving motor (6-3) is provided on the machine body (1). A second gear (6-4) meshingly connected to the first gear (6-2) is provided at the driving end of the driving motor (6-3).

Images