CN209832552U

CN209832552U - Plastic extruder

Info

Publication number: CN209832552U
Application number: CN201920577838.5U
Authority: CN
Inventors: 杨志勇; 刘童喜
Original assignee: Hubei Han Plastic Pipe Industry Group Co Ltd
Current assignee: Hubei Han Plastic Pipe Industry Group Co Ltd
Priority date: 2019-04-25
Filing date: 2019-04-25
Publication date: 2019-12-24
Anticipated expiration: 2029-04-25

Abstract

The utility model provides a plastic extruder, include barrel and connect the hopper in barrel one end, be equipped with one end in the barrel and stretch out the screw rod of barrel, the motor is connected through the speed reducer to the screw rod, and the aircraft nose is connected to the barrel other end, be equipped with the bush on the aircraft nose, the hopper includes preheating bin and stirring heated warehouses, is equipped with the (mixing) shaft of horizontal extension in the stirring heated warehouses, the (mixing) shaft passes through motor drive, preheating bin and stirring heated warehouses all are equipped with heating mechanism outward, and stirring heated warehouses intercommunication the barrel, the barrel is equipped with cooling body outward. Compared with the prior art, the utility model discloses screw rod length has been shortened to simplify and arrange, practiced thrift the energy consumption.

Description

Plastic extruder

Technical Field

The utility model relates to a plastics processing field especially relates to a plastics extruder.

Background

The screw is the heart of the extruder and is a key part of the extruder, and the performance of the screw determines the productivity, plasticizing quality, additive dispersibility, melt temperature, power consumption and the like of one extruder. Is the most important part of the extruder and can directly influence the application range and the production efficiency of the extruder. The plastic can move, pressurize and obtain part of heat from friction only in the material cylinder under the action of extreme pressure generated by the rotation of the screw, the plastic is mixed and plasticized in the moving process of the material cylinder, and the melt in the viscous flow state is extruded to flow through the die to obtain the required shape for molding. Like the barrel, the screw is also made of a high strength, heat and corrosion resistant alloy.

The most common screw diameter D is about 45-150 mm. The screw diameter increases and the processing capacity of the extruder increases accordingly, the productivity of the extruder being proportional to the square of the screw diameter D. The ratio of the effective length to the diameter (length-diameter ratio, expressed as L/D) of the working part of the screw is usually 18 to 25. The large L/D can improve the temperature distribution of materials, is beneficial to the mixing and plasticizing of plastics and can reduce leakage flow and reverse flow. The production capacity of the extruder is improved, the large-L/D screw has stronger adaptability, and can be used for extruding various plastics; however, when the L/D is too large, the plastic material can be degraded due to the increase of the heating time, and simultaneously, the free end bends and droops due to the increase of the self weight of the screw, so that the scratch between the charging barrel and the screw is easily caused, and the manufacturing and processing are difficult; the power consumption of the extruder is increased. An excessively short screw tends to cause poor plasticization in kneading.

Therefore, it is necessary to provide an extruder to solve the problem of the free end flexing and sagging when the L/D is too large.

SUMMERY OF THE UTILITY MODEL

The utility model discloses a plastic extruder through the technological means that will heat and cool off the split and be two sections, has shortened the length of screw rod free end, has solved scotch between feed cylinder and screw rod, makes the problem of processing difficulty.

In order to solve the technical problem, the utility model discloses specifically adopt following technical scheme: the utility model provides a plastic extruder, includes barrel and connects the hopper in barrel one end, be equipped with one end in the barrel and stretch out the screw rod of barrel, the screw rod passes through the speed reducer and connects the motor, and the aircraft nose is connected to the barrel other end, be equipped with the bush on the aircraft nose, the hopper includes preheating bin and stirring heated warehouses, is equipped with lateral extension's (mixing) shaft in the stirring heated warehouses, the (mixing) shaft passes through motor drive, all be equipped with heating mechanism outside preheating bin and the stirring heated warehouses, and stirring heated warehouses intercommunication the barrel, the barrel is equipped with cooling body outward.

Compared with the prior art, the utility model discloses following beneficial effect has: among the prior art, the transport section and the heating section of barrel can account for more than 60% of whole barrel, the utility model discloses in, owing to practiced thrift these two sections lengths for the total length of screw rod is less than the screw rod length of same diameter among the prior art, can guarantee under the same screw rod diameter, shortens the length of screw rod, avoids feed cylinder and screw rod scotch. And the stirring shaft and the materials are rubbed, so that the heating efficiency is further improved on the premise of uniform mixing.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Detailed Description

The following detailed description of the present invention will be made with reference to the accompanying drawings and examples.

As shown in the accompanying drawing 1, the utility model provides a plastic extruder, include barrel 1 and connect the hopper in 1 one end of barrel, be equipped with one end in barrel 1 and stretch out barrel 1's screw rod, the screw rod passes through speed reducer 3 and connects motor 2, and 1 other end connection aircraft nose 15 of barrel, be equipped with the bush on the aircraft nose 15, the hopper is equipped with horizontal extension's (mixing) shaft 8 including preheating storehouse 4 and stirring heated warehouses 9 in the stirring heated warehouses 9, (mixing) shaft 8 passes through the motor 2 drive, preheating storehouse 4 and stirring heated warehouses 9 all are equipped with heating mechanism 5 outward, and stirring heated warehouses 9 intercommunication barrel 1, barrel 1 is equipped with cooling body 7 outward. A valve is arranged between the preheating bin 4 and the stirring heating bin 9, and the valve is opened when the stirring heating bin 9 needs to be charged.

In the production process, the temperature of the preheating bin 4 is controlled to be lower than that of the stirring heating bin 9. The effect of preheating storehouse 4 lies in making the material preliminary heating, and its requirement to the temperature is not as strict as stirring heating storehouse 9, consequently can add material in raw material at any time, makes production go on in succession, preheats the material and can make it reach required temperature after getting into stirring heating storehouse 9 rapidly, improves production efficiency. And preheat storehouse 4 and stirring heated warehouses 9 and heat respectively and can avoid the material simultaneous heating of whole hopper, and the material that actually used at a certain moment is less than the material of whole hopper far away, and causes the waste of heat energy.

The stirring heating chamber 9 is also provided with an exhaust hole 14, a temperature sensor and a thermocouple (not shown in the figure). The purpose of its arrangement is the same as in the prior art.

A plurality of shearing blades 13 are uniformly distributed on the stirring shaft 8, and a plurality of shearing teeth 12 are further arranged on the inner wall of the stirring heating bin 9. The stirring shaft 8 can rub with materials to generate a large amount of heat so as to improve the heating efficiency. Both the shearing edge 13 and the shearing teeth 12 facilitate the breaking up of the plastic granules into finer particles, which on the one hand generate heat and on the other hand help the melting.

The output shaft of speed reducer 3 links to each other with the screw rod, just still be equipped with belt pulley 10 on the output shaft, also be equipped with belt pulley 10 on the (mixing) shaft 8, the cover is equipped with belt 11 between two belt pulleys 10. Motor 2 can drive (mixing) shaft 8 and screw rod simultaneously, and (mixing) shaft 8 stirs the material and helps rapid heating to stir out the bubble in the material, avoid having big bubble in the finished product plastic tubing.

The preheating bin 4 and the stirring heating bin 9 are arranged up and down and are arranged above the machine barrel 1 through a support.

The machine barrel 1 comprises a supporting section and a cooling section which are separated by a partition plate, a bearing is arranged in the middle of the partition plate, one part of the screw is a polished rod 61, the other part of the screw is provided with threads, namely a threaded section 62, the part of the screw, which is the polished rod 61, is connected with an output shaft of the speed reducer 3 and penetrates through the bearing, the threaded part of the screw is positioned in the cooling section, an opening (not shown in the figure) communicated with the stirring heating bin 9 is formed in the cooling section, and internal threads are further arranged on the inner wall of the cooling section. The screw is divided into a polished rod 61 and a thread part so that the screw and the stirring shaft 8 can be driven by one motor 2, and the polished rod 61 can be supported by the bearing, so that the length of the free end of the screw is further shortened, the vibration of the screw is reduced, and the material is conveyed more stably.

The cooling mechanism 7 is a cooling coil arranged outside the cooling section, and the heating mechanism 5 is a band-shaped heater. The cooling coil and the band heater are conventional arrangements in the field of plastic production and are used for cooling and heating, respectively.

Finally, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the present invention can be modified or replaced by other means without departing from the spirit and scope of the present invention, which should be construed as limited only by the appended claims.

Claims

1. The utility model provides a plastic extruder, includes barrel and connects the hopper in barrel one end, be equipped with one end in the barrel and stretch out the screw rod of barrel, the screw rod passes through the speed reducer and connects the motor, and the aircraft nose is connected to the barrel other end, be equipped with the bush on the aircraft nose, its characterized in that: the hopper includes preheating bin and stirring heated warehouses, is equipped with the (mixing) shaft of horizontal extension in the stirring heated warehouses, the (mixing) shaft passes through motor drive, all be equipped with heating mechanism outside preheating bin and the stirring heated warehouses, and the stirring heated warehouses intercommunication the barrel, the barrel is equipped with cooling body outward.

2. A plastic extruder as claimed in claim 1, wherein: a plurality of shearing blades are uniformly distributed on the stirring shaft, and a plurality of shearing teeth are further arranged on the inner wall of the stirring heating bin.

3. A plastic extruder as claimed in claim 2, wherein: the output shaft of speed reducer links to each other with the screw rod, just still be equipped with the belt pulley on the output shaft, also be equipped with the belt pulley on the (mixing) shaft, the cover is equipped with the belt between two belt pulleys.

4. A plastic extruder as claimed in claim 3, wherein: the preheating bin and the stirring heating bin are arranged up and down and are arranged above the machine barrel through a support.

5. A plastic extruder as claimed in claim 4, wherein: the barrel includes support section and the cooling zone that separates with the baffle, the baffle middle part is equipped with the bearing, screw rod partly is the polished rod, and another part is equipped with the screw thread, and the screw rod is connected the speed reducer output shaft and passes for the part of polished rod the bearing, the screw rod is equipped with the screwed part and is located in the cooling zone, be equipped with the intercommunication on the cooling zone the opening in stirring heated warehouses still is equipped with the internal thread on the inner wall of cooling zone.

6. A plastic extruder as claimed in claim 5, wherein: the cooling mechanism is a cooling coil arranged outside the cooling section.

7. A plastic extruder as claimed in claim 1, wherein: the heating mechanism is a band heater.