CN205148865U - A double screw extruder for production of polyethylene foam sheet - Google Patents

Abstract

The utility model relates to a twin-screw extruder, in particular to a twin-screw extruder used for the production of polyethylene foam sheets, comprising a mounting base, a barrel, an upper shaft, an upper screw, a lower shaft, a lower screw, Dies and drives. The extruder of the utility model has the advantages of reasonable structural design, convenient use and high work efficiency, and the heat insulating layer can ensure the liquefaction efficiency of solid materials and improve the work efficiency.

Description

A twin-screw extruder for the production of polyethylene foam sheets

technical field

The utility model relates to a twin-screw extruder, in particular to a twin-screw extruder used for producing polyethylene foam sheets.

Background technique

The extruder is widely used in the processing and molding of polymer materials. It is an important equipment in the production process of polymer materials. It generally consists of an extrusion system, a transmission system and a heating system. Its working principle is to pass the polymer material through the extrusion system. Plasticized into a uniform melt, which is continuously extruded from the machine head by the rotating screw. In the production of polyethylene foam sheets by existing extruders, the foaming agent and other auxiliary materials such as polyethylene are added to the twin-screw extruder, resulting in a significantly poor foaming effect and affecting the quality of the product. , The work of the extruder is not conducive to the generation of air bubbles, which greatly reduces the quality of polymer products.

Utility model content

The purpose of the utility model is to provide a twin-screw extruder for the production of polyethylene foam sheets with simple structure, high efficiency and good quality of extruded products.

In order to achieve the above object, the technical solution adopted by the utility model is:

A twin-screw extruder for the production of polyethylene foam sheets, comprising a mounting base, a machine barrel, an upper shaft, an upper screw, a lower shaft, a lower screw, a die head and a driving device; the barrel is mounted on the mounting base One end of the barrel is provided with a feed port, and the other end of the barrel is provided with a discharge port, and a touch head is installed on the discharge port; the upper screw and the lower screw are installed on the machine through the upper and lower shafts respectively. In the barrel, the end of the upper shaft and the lower shaft near the feed inlet extends out of the barrel, and the upper shaft and the lower shaft extending out of the barrel are respectively equipped with a driven gear and a driving gear. The movable gear is meshed and connected through an intermediate gear, and the intermediate gear is installed on the barrel through a fixed shaft; the lower transmission shaft is driven by a driving device; a heating device is uniformly arranged on the outer wall of the barrel; the upper end of the barrel A foaming agent injection port is also provided, and the foaming agent injection port communicates with the hopper above it through a pipeline, and an injection pump is installed on the pipeline.

Further, the flight pitch of the upper screw and the lower screw gradually increases from one end close to the feed inlet to the other end.

Further, a thermal insulation layer is provided on the barrel wall outside the heating device.

Further, the barrel is provided with a temperature sensor, and the temperature sensor is installed inside the barrel.

Further, there are multiple feed ports, which are respectively connected to feed pipes, and heating devices are provided on the feed pipes.

Further, the heating device is an electric heating wire or an electric heating sheet, and the heating device is controlled and heated by a heating controller.

Further, the drive device includes a motor, a reducer and a coupling, the motor is connected to the reducer for transmission, and the reducer is connected to the lower transmission shaft for transmission through the coupling.

The beneficial effects of the utility model are:

The utility model is equipped with a foaming agent injection port on the upper end of the machine barrel, and is forced to inject into the machine barrel through the injection pump, thereby improving the foaming effect; the thread distance of the screw increases gradually from the feed port to the discharge port, and the screw rod is close to the inlet. The end is used to fully mix and convey different raw and auxiliary materials. The screw pitch gradually increases to increase the foaming space to achieve a better foaming effect. At the same time, the mixing and extrusion of materials can be completed in one device, reducing the equipment. Cost; the feeding pipe of the utility model is provided with a heating device, so that the material is preheated before entering the extruder, so that it is easier to mix evenly. The extruder of the utility model has the advantages of reasonable structural design, convenient use and high work efficiency, and the heat insulating layer can ensure the liquefaction efficiency of solid materials and improve the work efficiency.

Description of drawings

Fig. 1 is the structural representation of the utility model.

In the figure: 1. Installation base, 2. Machine barrel, 3. Feed pipe, 4. Upper shaft, 5. Upper screw, 6. Lower shaft, 7. Lower screw, 8. Die head, 9. Heating device, 10 , driven gear, 11, driving gear, 12, intermediate gear, 13, mounting bracket, 14, hopper, 15, injection pump, 16, temperature sensor, 17, insulation layer, 18, motor, 19, reducer, 20, coupling.

detailed description

As shown in the figure, the utility model includes a mounting base 1, a barrel 2, an upper shaft 4, an upper screw 5, a lower shaft 6, a lower screw 7, a die head 8 and a driving device.

Described machine barrel 2 is fixedly installed on the mounting base 1, and one end of this machine barrel 2 is provided with feed inlet, and the other end of this machine barrel is provided with discharge port, and touch head 8 is installed on this discharge port; There are multiple ports, which are respectively connected with feed pipes, and each feed pipe 3 is provided with a heating device 9 .

The two ends of the upper screw 5 are installed in the machine barrel 2 through the upper rotating shaft 4, the two ends of the lower screw 7 are installed in the machine barrel 2 through the lower rotating shaft 6, and the upper screw and the lower screw are installed in the machine barrel symmetrically up and down; The upper shaft and the lower shaft near the feed inlet extend out of the barrel, and the upper shaft and the lower shaft extending out of the barrel are respectively fixed with a driven gear 10 and a driving gear 11. The driving gear and the driven gear Through the meshing connection of the intermediate gear 12, the intermediate gear is installed on the machine barrel through a fixed shaft; the lower transmission shaft is driven by a driving device; the upper transmission shaft and the lower transmission shaft at the end near the discharge port are installed on the mounting bracket 13 On, the installation is fixedly installed in the barrel.

The upper end of the middle part of the barrel 2 is also provided with a foaming agent injection port, which communicates with the hopper 14 above it through a pipeline, and an injection pump 15 is installed on the pipeline.

Heating devices 9 are evenly distributed on the outer wall of the barrel. The above-mentioned heating device is an electric heating wire or an electric heating sheet, and the above-mentioned heating device is controlled and heated by a heating controller; at the same time, a temperature sensor 16 is arranged on the machine barrel, and the temperature sensor 16 is inserted into the inside of the machine barrel for installation. The temperature sensor is connected with the heating controller, so that the heating temperature is automatically kept constant within a certain temperature range, and the quality of the product is improved. In order to further ensure constant temperature and reduce production cost, a layer of insulation layer 17 is provided on the barrel wall outside the heating device.

In order to further improve production efficiency and product quality, the thread pitch of the upper screw and the lower screw of the utility model gradually increases from the end close to the feed inlet to the outlet end. The screw near the inlet end is used to fully mix and convey different raw and auxiliary materials, and the screw pitch gradually increases to increase the foaming space to achieve a better foaming effect.

The driving device described in the utility model includes a motor 18, a speed reducer 19 and a shaft coupling 20, the motor 18 is connected to the speed reducer 19 for transmission, and the speed reducer is connected to the transmission shaft through the shaft coupling 20.

Claims (7)

1. A twin-screw extruder used for the production of polyethylene foam sheets is characterized in that: it comprises a mounting base, a machine barrel, an upper shaft, an upper screw, a lower shaft, a lower screw, a die head and a driving device; The machine barrel is installed on the installation base, one end of the machine barrel is provided with a feed port, the other end of the machine barrel is provided with a discharge port, and a touch head is installed on the discharge port; the upper screw and the lower screw respectively pass through the upper shaft The upper and lower rotating shafts are installed in the machine barrel, and one end of the upper and lower rotating shafts close to the feed port extends out of the machine barrel, and the upper and lower transmission shafts extending out of the machine barrel are respectively equipped with driven gears and driving gears , the driving gear and the driven gear are meshed and connected through an intermediate gear, and the intermediate gear is installed on the machine barrel through a fixed shaft; the lower transmission shaft is driven by a driving device; a heating device is evenly arranged on the outer wall of the machine barrel; The upper end of the machine barrel is also provided with a foaming agent injection port, which communicates with the hopper above it through a pipeline, and an injection pump is installed on the pipeline. 2. A twin-screw extruder for polyethylene foam sheet production according to claim 1, characterized in that: the screw pitch on the upper screw and the lower screw is from one end near the feed port to the other end Gradually increase. 3. A twin-screw extruder for producing polyethylene foam sheets according to claim 1, characterized in that: the barrel wall outside the heating device is provided with a layer of insulation layer. 4. A kind of twin-screw extruder for the production of polyethylene foam sheet according to claim 1, characterized in that: the barrel is provided with a temperature sensor, and the temperature sensor extends into the inside of the barrel Install. 5. A kind of twin-screw extruder that is used for the production of polyethylene foam sheet according to claim 1, is characterized in that: described feeding port is provided with a plurality of, and is connected with feed pipe respectively, and this A heating device is provided on the feed pipe. 6. A twin-screw extruder for producing polyethylene foam sheets according to claim 1 or 5, characterized in that: the heating device is an electric heating wire or an electric heating sheet, and the heating device is controlled by a heating controller Controlled and heated. 7. A kind of twin-screw extruder that is used for the production of polyethylene foam sheet according to claim 1, is characterized in that: described driving device comprises motor, reducer and shaft coupling, and this motor is connected with reducer Transmission, the reducer is connected to the lower transmission shaft through a coupling.