CN210174160U

CN210174160U - Double-screw extruder

Info

Publication number: CN210174160U
Application number: CN201921051269.7U
Authority: CN
Inventors: Fabing Wang; 汪发兵
Original assignee: Jiangsu Plastic Source Machinery Manufacturing Co Ltd
Current assignee: Jiangsu Plastic Source Machinery Manufacturing Co Ltd
Priority date: 2019-07-05
Filing date: 2019-07-05
Publication date: 2020-03-24
Anticipated expiration: 2029-07-05

Abstract

The utility model discloses a double screw extruder, including barrel and two screw rod units, two screw rod units all are located the barrel, the one end of barrel is provided with the screw drive gear box, the input of screw drive gear box is connected with drive arrangement, the output and two screw rod units of screw drive gear box are connected respectively, the other end of barrel is provided with crowded material die head, two screw rod unit parallel arrangement, every screw rod unit follows screw drive gear box to crowded material die head's extending direction on the screw rod diameter grow gradually, two gap between the screw rod unit diminishes gradually, two the screw rod unit meshes before crowded material die head. The utility model discloses the gap between two screw rod units diminishes gradually until two screw rod unit meshing, both unites two into one single screw extruder and double screw extruder's advantage, and the gap through two screw rod units changes gradually again, prevents that the material grain in two screw rod units from blockking up.

Description

Double-screw extruder

Technical Field

The utility model relates to an extrusion moulding equipment technical field, concretely relates to double screw extruder.

Background

The screw rod is a cylinder with a spiral groove cut on the outer surface or a cone with a conical spiral groove cut on the outer surface. The existing extruder usually adopts a screw structure, so that materials gradually change into linear motion along with the rotation motion of the screw, are pushed towards a machine head and are matched with a machine body to compress, generate heat, soften and stir and mix the materials.

The common extruders can be divided into a single-screw extruder, a double-screw extruder and a multi-screw extruder according to the number of screws, at present, the single-screw extruder and the double-screw extruder are used in the market, and as is well known, the double-screw extruder has the advantage of good plasticizing performance, but the pressure of the double-screw extruder is unstable; the single screw extruder has the advantage of stable extrusion pressure, but has poor plasticizing performance. In conclusion, if the advantages of the two screw extruders can be combined into one, the application range of the screw extruder can be further expanded, which is a great reform in the screw extruder industry.

In the prior art, a double-screw extruder with two different screw rods is developed, so that the advantages of a single screw rod and the advantages of the double-screw extruder are combined into a whole, but the double-screw extruder with two different screw rods has certain defects:

1. due to the arrangement of the double screws, the size of the machine barrel needs to be integrally increased, so that in a single-screw area, the single screw cannot integrally push materials in the machine barrel, and the extrusion accumulation in the case is caused;

2. at the butt joint position of the single screw and the double screws, materials are easy to block between the two screws due to different extrusion modes of the single screw and the double screws.

Disclosure of Invention

The to-be-solved technical problem of the utility model is to provide a double screw extruder, the gap between two screw rod units diminishes gradually until two screw rod unit meshing, both unites two into one with single screw extruder and double screw extruder's advantage, and the gap through two screw rod units changes gradually again, prevents that the material grain in two screw rod units from blockking up.

In order to solve the technical problem, the utility model provides a double screw extruder, including barrel and two screw rod units, two screw rod units all are located the barrel, the one end of barrel is provided with the screw drive gear box, the input of screw drive gear box is connected with drive arrangement, the output and two screw rod units of screw drive gear box are connected respectively, the other end of barrel is provided with crowded material die head, two screw rod unit parallel arrangement, every screw rod unit follows screw rod drive gear box to crowded material die head extending direction on the screw rod diameter grow gradually, two gap between the screw rod unit diminishes gradually, two the screw rod unit meshes before crowded material die head.

The utility model discloses a preferred embodiment, further include the screw rod diameter of screw rod unit is the stair-type change, including the multistage screw rod in the screw rod unit, the diameter of the screw rod of any adjacent two sections is different, and the screw rod diameter in each section is the same.

In a preferred embodiment of the present invention, the screw rod in the screw rod unit is a tapered inclined screw rod, and the outer side surface of the screw rod is an inclined surface.

The utility model discloses a preferred embodiment, further include still be provided with feeding device on the barrel, feeding device sets up in being close to screw drive gear box one side, feeding device includes the main feed inlet of installation in the vertical direction and installs the side feed inlet in the horizontal direction.

In a preferred embodiment of the present invention, the feeding device further comprises a heating device disposed at the bottom of the feeding device.

The utility model discloses a preferred embodiment, further include in the screw drive gear box driving gear and driven gear, driving gear and driven gear meshing set up, and two screw units are installed respectively on driving gear and driven gear, the driving gear is connected with drive arrangement.

The present invention provides a preferred embodiment, further comprising the driving device is a speed reducer, and the driving gear is connected to the output end of the speed reducer through a coupling.

The utility model discloses a preferred embodiment, further include the exit of crowded material die head still is provided with measuring pump and pressure controller.

The utility model has the advantages that:

one of which, the utility model provides a gap between two screw rod units diminishes gradually until two screw rod unit meshing, at the inside part that does not mesh of case, two screw rod units all are equivalent to an independent single screw rod mechanism, satisfy the single screw rod and have the stable advantage of extrusion pressure, at the inside part of meshing of case equivalent to double screw rod mechanism, satisfy the double screw and have the advantage that the plastify can be good.

The gaps of the two screw units are gradually changed, a gradually-changed forming process exists in the screw extrusion process, and compared with the two screw units which are directly meshed, the gaps of the screw units are gradually changed to gradually extrude and form material particles, so that the material particles in the two screw units are prevented from being blocked.

Drawings

FIG. 1 is a schematic structural view of a twin-screw extruder of the present invention;

fig. 2 is a schematic structural view of an embodiment of the screw unit of the present invention;

fig. 3 is a schematic structural view of another embodiment of the screw unit of the present invention.

The reference numbers in the figures illustrate: 1. a barrel; 2. a screw unit; 3. a screw drive gearbox; 4. a drive device; 5. a material extruding die head; 6. a feeding device; 7. a heating device.

Detailed Description

The present invention is further described with reference to the following drawings and specific embodiments so that those skilled in the art can better understand the present invention and can implement the present invention, but the embodiments are not to be construed as limiting the present invention.

Referring to fig. 1, the double screw extruder of the present invention includes a machine barrel 1 and two screw units 2, the two screw units 2 are both located in the machine barrel 1, one end of the machine barrel 1 is provided with a screw driving gear box 3, an input end of the screw driving gear box 3 is connected with a driving device 4, an output end of the screw driving gear box 3 is respectively connected with the two screw units 2, the driving device 4 synchronously drives the two screw units 2 to rotate through the screw driving gear box 3, the other end of the machine barrel 1 is provided with a material extruding die head 5, and the screw units 2 gradually change materials into linear motion along with the rotation motion of the screws and extrude the materials from the material extruding die head 5; the two screw units 2 are arranged in parallel, the diameter of each screw unit 2 gradually increases from the screw driving gear box 3 to the extension direction of the extrusion die head 5, the gap between the two screw units 2 gradually decreases, and the two screw units 2 are meshed in front of the extrusion die head 5.

Referring to fig. 2, for the utility model discloses two an embodiment of screw unit 2, in this embodiment, screw unit 2's screw diameter is cascaded change, including the multistage screw rod in screw unit 2, the diameter of arbitrary two sections adjacent screw rods is different, and the screw diameter in each section is the same, and the screw rod is the step grow gradually from screw drive gear box 3 to the ascending diameter of the extending direction of crowded material die head 5, and the diameter change of two sections adjacent screw rods is 2 ~ 4 millimeters, thereby two screw unit 2's gap also gradually changes, up to screw unit 2 is close to crowded material die head 5 one end, two screw unit 2 meshes.

Referring to fig. 3, for the utility model discloses a two another embodiment of screw unit 2, the screw rod in the screw unit 2 is toper slope screw rod, the lateral surface of screw rod is the inclined plane, the lateral surface inclination of screw rod is 5 ~ 10 the screw unit 2 is close to 5 one ends of crowded material die head, two the meshing of screw unit 2, two the meshing part of screw unit 2, two the lateral surface of screw unit 2 is the plane, the screw rod meshing of being convenient for.

Specifically, the machine barrel 1 is further provided with a feeding device 6, the feeding device 6 is arranged on one side close to the screw driving gear box 3, the feeding device 6 comprises a main feeding port arranged in the vertical direction and a side feeding port arranged in the horizontal direction, and according to specific use conditions, a plurality of feeding ports can be further arranged on the outer ring of the feeding device 6, so that the machine barrel is suitable for mixing and processing of various material particles.

Specifically, the bottom of the feeding device 6 is further provided with a heating device 7, and the heating device 7 heats and dries the material particles entering the machine box in advance.

Specifically, including driving gear and driven gear in the screw drive gear box 3, driving gear and driven gear meshing set up, and two screw unit 2 are installed respectively on driving gear and driven gear, the driving gear is connected with drive arrangement, the driving gear drives driven gear and rotates to two screw unit 2's synchronous rotation has been realized, and driving gear and driven gear meshing set up, make its rotation opposite direction, thereby make two screw unit 2 incorgruous rotations, carry out rotatory extrusion to the material grain.

Specifically, the driving device 4 is a speed reducer, and the driving gear is connected with the output end of the speed reducer through a coupler.

Specifically, the outlet of the extrusion die head 5 is also provided with a metering pump and a pressure controller, the metering pump is used for calculating the discharge amount and controlling the machine to stably discharge, and the pressure controller can measure and adjust the discharge pressure so that the discharge pressure meets the production requirement.

The above-mentioned embodiments are merely preferred embodiments for fully illustrating the present invention, and the scope of the present invention is not limited thereto. Equivalent substitutes or changes made by the technical personnel in the technical field on the basis of the utility model are all within the protection scope of the utility model. The protection scope of the present invention is subject to the claims.

Claims

1. The double-screw extruder is characterized by comprising a machine barrel and two screw units, wherein the two screw units are located in the machine barrel, a screw driving gear box is arranged at one end of the machine barrel, the input end of the screw driving gear box is connected with a driving device, the output end of the screw driving gear box is respectively connected with the two screw units, an extruding die head is arranged at the other end of the machine barrel, the two screw units are arranged in parallel, each screw unit is gradually enlarged in screw diameter in the extending direction from the screw driving gear box to the extruding die head, a gap between the two screw units is gradually reduced, and the two screw units are meshed in front of the extruding die head.

2. The twin screw extruder of claim 1, wherein the screw diameter of the screw units varies stepwise, the screw units comprising a plurality of stages of screws, the screw diameters of any two adjacent stages being different, the screw diameter in each stage being the same.

3. The twin screw extruder as claimed in claim 1, wherein the screws in the screw units are tapered inclined screws, and the outer side faces of the screws are inclined faces.

4. The twin screw extruder of claim 1, wherein the barrel is further provided with a feeding device, the feeding device is arranged at a side close to the screw driving gear box, and the feeding device comprises a main feeding port arranged in a vertical direction and a side feeding port arranged in a horizontal direction.

5. The twin screw extruder as defined in claim 4, wherein the bottom of said feeding means is further provided with a heating means.

6. The twin screw extruder of claim 1, wherein the screw drive gear box comprises a driving gear and a driven gear, the driving gear and the driven gear are meshed, the two screw units are respectively mounted on the driving gear and the driven gear, and the driving gear is connected with the driving device.

7. The twin screw extruder of claim 6 wherein the drive means is a speed reducer and the drive gear is coupled to the output of the speed reducer by a coupling.

8. The twin screw extruder of claim 1, wherein a metering pump and a pressure controller are further provided at the exit of the extrusion die.