CN114393806A

CN114393806A - Dehumidification structure of extruder

Info

Publication number: CN114393806A
Application number: CN202210228433.7A
Authority: CN
Inventors: 张航媛; 黄剑; 李海超; 余德培; 翁志浩; 贺晓莉
Original assignee: Era Co Ltd
Current assignee: Era Co Ltd
Priority date: 2022-03-08
Filing date: 2022-03-08
Publication date: 2022-04-26

Abstract

The invention provides a dehumidifying structure of an extruder, and belongs to the technical field of extruders. It has solved the problem that the dehumidification structure of current extruder influences efficiency because of blockking up. This dehumidification structure of extruder, the extruder includes the frame, fix the feed cylinder in the frame and rotate the screw rod that sets up in the feed cylinder, the dehumidification structure includes the storage box, run through on the feed cylinder lateral wall and seted up the aspirating hole, run through the intercommunicating pore of seting up with the relative intercommunication of aspirating hole on the storage box, the dehumidification structure still includes that the drive end stretches into the driving piece in the storage box, be equipped with the stub bar of scraping that is connected with the drive end of driving piece in the storage box, and the drive end of driving piece can drive the central line reciprocating motion who scrapes the stub bar along the aspirating hole, scrape the lateral wall of stub bar and the pore wall transition fit of aspirating hole when scraping the stub bar and passing the intercommunicating pore and stretching into the aspirating hole. The dehumidification structure of the extruder is high in dehumidification efficiency.

Description

Dehumidification structure of extruder

Technical Field

The invention belongs to the technical field of extruders and relates to a dehumidifying structure of an extruder.

Background

The plastic extruder can be classified into a twin-screw extruder, a single-screw extruder, an uncommon multi-screw extruder and a non-screw extruder, and the screw extruder can fully plasticize and uniformly mix materials by means of pressure and shearing force generated by rotation of a screw, and the materials are molded through a die. The barrel of the screw extruder is generally divided into a conveying section, a compression section and a metering section, plastic particles enter the barrel from a hopper and are conveyed forwards under the driving of the rotation of a screw, and the plastic particles are heated by the barrel and sheared and compressed by the screw in the forward movement process to melt the materials. Because plastics are granular when getting into the feed cylinder from the hopper, contain the moisture in the air in the clearance between the granule, this moisture can exert an influence to the form after the plastics melts, consequently need to carry out evacuation to the feed cylinder before melting, take out the moisture, because the subsidiary abundant plastic powder of plastic granule, consequently current equipment through evacuation dehumidification docks with the feed cylinder, easy in butt joint position adhesion a large amount of plastic powder, these long-time adhesion and the plastic powder that gradually accumulates appear the crystallization, difficult elimination, and then lead to the intercommunication position to pass through the cross-sectional area and diminish, influence dehumidification efficiency.

Disclosure of Invention

The invention aims to solve the problems in the prior art, and provides a dehumidifying structure of an extruder, which is used for solving the problem that the efficiency is affected due to blockage in the dehumidifying structure of the extruder.

The purpose of the invention can be realized by the following technical scheme: the utility model provides a dehumidification structure of extruder, the extruder includes the frame, fixes the feed cylinder in the frame and rotates the screw rod that sets up in the feed cylinder, a serial communication port, the dehumidification structure is including fixing the storage box that communicates on frame or feed cylinder and with the vacuum pump, run through on the feed cylinder lateral wall and seted up the aspirating hole, run through on the storage box and set up the intercommunicating pore that communicates with the aspirating hole is relative, the dehumidification structure still includes that the drive end stretches into the driving piece in the storage box, be equipped with the stub bar of scraping that is connected with the drive end of driving piece in the storage box, and the drive end of driving piece can drive the central line reciprocating motion of scraping stub bar along the aspirating hole, works as scrape the stub bar and pass the intercommunicating pore and stretch into the pore wall transition fit of scraping the lateral wall of stub bar and aspirating hole when in the aspirating hole.

The extruder is also provided with a hopper for feeding, the plastic particles gradually move under the pushing of a screw after entering the material cylinder, the material cylinder heats the plastic particles, the plastic particles are gradually melted in the moving process and are extruded by the screw, when the plastic particles enter the material cylinder, gaps among the particles contain air and moisture, therefore, a vacuum pump is started for air exhaust and dehumidification, the air with certain humidity and containing plastic powder enters the material storage box after passing through the air exhaust hole and the communication hole, the plastic powder is adhered on the inner wall of the material storage box, the air is pumped out of the material storage box, part of the plastic powder is adhered on the wall of the air exhaust hole, a driving part and a scraping head are arranged for this purpose, the driving end of the driving part drives the scraping head to stretch and retract, so that the scraping head extends into the air exhaust hole, the outer side wall of the scraping head is in transition fit with the wall of the air exhaust hole, the edge of the scraping head can scrape the plastic powder adhered on the wall of the air exhaust hole, avoid because plastics powder piles up gradually and leads to the aspirating hole aperture to diminish, and then influence the dehumidification efficiency of bleeding, also can avoid leading to the air current to produce the noise when passing through because the aspirating hole aperture diminishes.

In the dehumidification structure of foretell extruder, the aspirating hole is the round hole, scrape the stub bar and be discoid, and scrape the stub bar and have the same central line with the aspirating hole, scrape the wall transition fit of the periphery of stub bar and the pore wall of aspirating hole when scraping the stub bar and stretching into the aspirating hole. Circular shape aspirating hole and discoid scraping head for both need not to aim at in circumference, only need guarantee the axiality can, thereby avoid appearing the jamming because of long-time the use.

In the dehumidification structure of the extruder, the end face of the scraping head facing the air exhaust hole is an arc-shaped scraping surface, the charging barrel is provided with a cavity wall matched with the screw rod, and the scraping surface is in smooth transition with the cavity wall of the charging barrel when the scraping head extends into the air exhaust hole. When scraping the stub bar and stretching into the aspirating hole and strike off plastic powder, the part plastic powder of being scraped can the adhesion on scraping the charge level, the plastic powder of long-time adhesion on scraping the charge level can form the crystallization, be difficult to clear away, the charge level setting will be the cambered surface for this reason, and scrape the charge level and the smooth transition of feed cylinder chamber wall when scraping the stub bar and stretching into in the aspirating hole, the screw rod can form the cooperation with scraping the charge level equally this moment, thereby will scrape the plastic powder of adhesion on scraping the charge level, this application is through scraping the plastic powder of stub bar on with the aspirating hole pore wall promptly, scrape the plastic powder of scraping on the charge level through the screw rod again will scrape the stub bar, need not manual clearance.

In the dehumidification structure of the extruder, the center line of the air exhaust hole is perpendicular to the center line of the screw and is located on one side of the center line of the screw, when the material scraping head is located outside the air exhaust hole, the material scraping surface is opposite to the air exhaust hole, and the material scraping surface is obliquely arranged along the direction of the center line of the air exhaust hole. Because scrape the stub bar when bleeding and be located the aspirating hole outside, but scrape the charge level all the time with the aspirating hole relative, the air current that the aspirating hole was washed out can openly strike and scrape the charge level, thereby produce the resistance to the air current, not only influence efficiency, and can produce great noise, misplace aspirating hole and screw rod central line for this reason, make can personally submit the slope setting with the scraping of feed cylinder chamber wall smooth transition, avoid the air current openly to strike and scrape the charge level, reduce the energy consumption, the noise reduction, simultaneously because the slope sets up, can blow off the plastic powder of adhesion on scraping the charge level when the air current strikes and scrapes the charge level.

In the dehumidification structure of foretell extruder, the driving piece is including driving actuating cylinder, the piston rod that drives actuating cylinder stretches into in the storage box, scrape the stub bar and fix the piston rod tip that drives actuating cylinder. The driving cylinder is simple and stable in structure, and can well realize the reciprocating motion of the scraping head.

In the dehumidification structure of the extruder, the storage box comprises a rectangular box body and a box cover fixedly covered on the box body, a sealing ring is arranged between the box cover and the box body, and the driving piece is fixed on the box cover. The setting of lid makes the storage box manually open, and then regularly clears up the plastic powder in the storage box, and the setting of sealing ring can guarantee the vacuum of storage box when bleeding, improves the efficiency.

In the dehumidification structure of the extruder, the mounting groove is formed in the upper portion of the material cylinder, the air exhaust hole is formed in the bottom surface of the mounting groove, the box body is embedded into the mounting groove and is fixedly connected with the material cylinder, the communication hole is formed in the bottom surface of the box body, and a sealing gasket is arranged between the box body and the bottom surface of the mounting groove. Because the driving piece of scraping the stub bar is connected and is fixed on the storage box, the aspirating hole is seted up on the feed cylinder, and scrape and need accurate cooperation to avoid appearing the jamming or scrape the material inhomogeneous between stub bar and the aspirating hole, has seted up the mounting groove on the feed cylinder for this reason, guarantees the relative position precision between the two with the mounting groove cooperation with the box body earlier, and then guarantees to scrape the relative position precision between stub bar and the aspirating hole.

In the dehumidification structure of the extruder, two screws are arranged in the material barrel, two air exhaust holes are formed in the material barrel and are respectively opposite to the two screws, two material scraping heads are respectively opposite to the two air exhaust holes, and one sides, close to the two material scraping surfaces, of the two material scraping surfaces are inclined upwards. Two stub bars of scraping are located two screw rod central lines outsides respectively to make two one side tilt up that the charge level is close to mutually, two charge levels of scraping are strikeed to the air current of two aspirating holes, and flow and mix to the middle part under two direction of scraping the charge level, avoid plastic powder to take the situation out the storage box, and then make plastic powder stay in the storage box as far as.

In the dehumidification structure of the extruder, the vacuum pump is fixed on the frame, the air inlet end of the vacuum pump is connected with the air exhaust pipe, the bottom surface of the box body is further provided with an air outlet, and the upper end of the air exhaust pipe is communicated with the air outlet. The whole structure is simpler and more stable.

In the dehumidification structure of the extruder, the diameter of the air exhaust hole is smaller than that of the air outlet hole. Make the air current flow rate faster when taking out from the aspirating hole, and then erode the scraping surface, reduce plastic powder and remain on scraping the material surface.

Compared with the prior art, the dehumidification structure of the extruder has the following advantages:

1. because the drive end of driving piece drives scrapes the stub bar flexible for it stretches into in the aspirating hole to scrape the stub bar, scrapes the transition fit of stub bar lateral wall and aspirating hole pore wall, can make the border of scraping the stub bar strike off the plastics powder of adhesion on the aspirating hole pore wall, avoids because plastics powder piles up gradually and leads to the aspirating hole aperture to diminish, and then influences the dehumidification efficiency of bleeding, also can avoid because the aspirating hole aperture diminishes leads to the air current noise when passing through.

2. Owing to scrape the charge level setting and be the cambered surface, and scrape charge level and feed cylinder chamber wall smooth transition when scraping the stub bar and stretching into the exhaust hole, the screw rod can form the cooperation with scraping the charge level equally this moment to will scrape the plastics powder of adhesion on the charge level and strike off, need not manual clearance.

3. Because the slope setting is personally submitted in the scraper, avoid the air current openly to strike the scraper face, reduce the energy consumption, the noise abatement, simultaneously because the slope sets up, can blow off the plastic powder of adhesion on the scraper face when the air current strikes the scraper face.

Drawings

Fig. 1 is a schematic perspective view of an extruder.

Fig. 2 is a cross-sectional view of the extruder in a transverse configuration.

Fig. 3 is an enlarged view of the structure at a in fig. 2.

Fig. 4 is a partial structural view when the cartridge cover is not attached at the magazine.

FIG. 5 is a partial sectional view of the construction at the cartridge with the scraper head extending into the suction hole.

In the figure, 1, a frame; 2. a charging barrel; 21. an air exhaust hole; 22. mounting grooves; 23. a gasket; 3. a screw; 4. a storage box; 41. a box body; 411. a communicating hole; 412. an air outlet; 42. a box cover; 421. fixing the rod; 43. a seal ring; 5. scraping the material head; 51. scraping the material surface; 6. a driving cylinder; 7. a vacuum pump; 71. an air exhaust pipe; 8. and (4) a hopper.

Detailed Description

The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.

As shown in fig. 1 and 2, the dehumidifying structure of the extruder comprises a frame 1, a straight barrel-shaped material barrel 2 is horizontally fixed on the frame 1, one end of the material barrel 2 is a feeding end, a hopper 8 is fixed on the upper portion of the feeding end and used for plastic particles to enter the material barrel 2, two screws 3 are rotatably arranged in the material barrel 2, and a driving source capable of driving the screws 3 to rotate is further arranged at one end of the material barrel 2 of the frame 1 and is an existing motor, a reducer and the like. The dehumidifying structure comprises a storage box 4 fixed on the top of a charging barrel 2, a vacuum pump 7 is fixed on a frame 1, the vacuum pump 7 is communicated with the storage box 4, two vertical through air pumping holes 21 are arranged on the side wall of the top of the charging barrel 2, two vertical through communication holes 411 are arranged at the bottom of the storage box 4, the two communication holes 411 are respectively communicated with the two air pumping holes 21, a driving air cylinder 6 is also fixed on the top of the storage box 4, the driving air cylinder 6 is provided with two piston rods which are vertically downward and both extend into the storage box 4, two scraping heads 5 are fixed at the end parts of the two piston rods of the driving air cylinder 6, the two scraping heads 5 are both disc-shaped, one end surfaces of the two scraping heads 5 respectively face the two air pumping holes 21, the two air pumping holes 21 are round holes, the scraping heads 5 and the opposite air pumping holes 21 have the same central line, the driving air cylinder 6 can drive the scraping heads 5 to reciprocate along the central line of the air pumping holes 21, and when the scraping head 5 passes through the communication hole 411 and extends into the air exhaust hole 21, the peripheral wall of the scraping head 5 is in transition fit with the hole wall of the air exhaust hole 21.

Specifically, as shown in fig. 3, 4 and 5, the end surface of the scraping head 5 facing the air exhaust hole 21 is an arc-shaped scraping surface 51, the barrel 2 has a cavity wall matched with the screw 3, and the scraping surface 51 is in smooth transition with the cavity wall of the barrel 2 when the scraping head 5 extends into the air exhaust hole 21. The central line of the air exhaust hole 21 is perpendicular to the central line of the screw 3, the central lines of the two air exhaust holes 21 are respectively located at the outer sides of the central lines of the two screws 3, when the scraping head 5 is located at the outer part of the air exhaust hole 21, the scraping surface 51 is opposite to the air exhaust hole 21, and the scraping surface 51 is obliquely arranged along the central line direction of the air exhaust hole 21, that is, one side of the two scraping surfaces 51 close to each other is inclined upwards. The storage box 4 includes that the box body 41 and the fixed lid of rectangle establish the lid 42 on the box body 41, be equipped with sealing ring 43 between lid 42 and the box body 41, it fixes on lid 42 to drive actuating cylinder 6 through the dead lever 421 of vertical setting, mounting groove 22 has been seted up on feed cylinder 2 upper portion, aspirating hole 21 is seted up on mounting groove 22 bottom surface, box body 41 imbeds in the mounting groove 22 and links firmly mutually with feed cylinder 2, and the laminating of the cell wall of box body 41 lateral surface and mounting groove 22, on box body 41 bottom surface has been seted up to intercommunicating pore 411, be equipped with sealed pad 23 between box body 41 and the mounting groove 22 bottom surface. The bottom surface of the box body 41 is further provided with an air outlet 412, the aperture of the air exhaust hole 21 is smaller than that of the air outlet 412, the air inlet end of the vacuum pump 7 is connected with an air exhaust pipe 71, and the upper end of the air exhaust pipe 71 is communicated with the air outlet 412.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.

Although the terms frame 1, cartridge 2, suction opening 21, etc. are used more herein, the possibility of using other terms is not excluded. These terms are used merely to more conveniently describe and explain the nature of the present invention; they are to be construed as being without limitation to any additional limitations that may be imposed by the spirit of the present invention.

Claims

1. The utility model provides a dehumidification structure of extruder, extruder include frame (1), fix feed cylinder (2) in frame (1) and rotate screw rod (3) of setting in feed cylinder (2), a serial communication port, the dehumidification structure is including fixing storage box (4) that fix on frame (1) or feed cylinder (2) and communicate with vacuum pump (7), run through on feed cylinder (2) the lateral wall and seted up aspirating hole (21), run through intercommunication hole (411) of seting up relative intercommunication with aspirating hole (21) on storage box (4), the dehumidification structure still includes the driving part that the driving end stretches into in storage box (4), be equipped with in storage box (4) with the driving end of driving part be connected scrape stub bar (5), and the driving end of driving part can drive and scrape the central line reciprocating motion of stub bar (5) along aspirating hole (21), work as scrape the lateral wall that stub bar (5) passed intercommunicating hole (411) and stretched into aspirating hole (21) when scraping stub bar (5) and pass intercommunicating hole (21) in Is in transition fit with the wall of the extraction hole (21).

2. The dehumidifying structure of an extruder according to claim 1, wherein the air exhaust hole (21) is a circular hole, the scraper head (5) is disc-shaped, the scraper head (5) and the air exhaust hole (21) have the same center line, and when the scraper head (5) extends into the air exhaust hole (21), the outer peripheral wall of the scraper head (5) is in transition fit with the wall of the air exhaust hole (21).

3. The dehumidification structure of an extruder according to claim 2, wherein the end surface of the scraper head (5) facing the suction hole (21) is an arc-shaped scraper surface (51), the barrel (2) has a cavity wall matched with the screw (3), and the scraper surface (51) is smoothly transited with the cavity wall of the barrel (2) when the scraper head (5) extends into the suction hole (21).

4. The dehumidifying structure of an extruder of claim 3, wherein the centerline of the suction hole (21) is perpendicular to the centerline of the screw (3) and is located at one side of the centerline of the screw (3), the scraping surface (51) is opposite to the suction hole (21) when the scraping head (5) is located outside the suction hole (21), and the scraping surface (51) is disposed obliquely in the centerline direction of the suction hole (21).

5. The dehumidification structure of an extruder according to any one of claims 1 to 4, wherein the driving member comprises a driving cylinder (6), a piston rod of the driving cylinder (6) extends into the storage box (4), and the scraper head (5) is fixed at the end of the piston rod of the driving cylinder (6).

6. The dehumidification structure of an extruder according to any one of claims 1 to 4, wherein the storage box (4) comprises a rectangular box body (41) and a box cover (42) fixedly covering the box body (41), a sealing ring (43) is arranged between the box cover (42) and the box body (41), and the driving member is fixed on the box cover (42).

7. The dehumidification structure of an extruder according to claim 6, wherein the upper portion of the barrel (2) is provided with a mounting groove (22), the air suction hole (21) is provided on the bottom surface of the mounting groove (22), the box body (41) is embedded into the mounting groove (22) and is fixedly connected with the barrel (2), the communication hole (411) is provided on the bottom surface of the box body (41), and a sealing gasket (23) is provided between the box body (41) and the bottom surface of the mounting groove (22).

8. The dehumidification structure of an extruder according to claim 4, wherein two screws (3) are provided in the barrel (2), two of the suction holes (21) are provided and respectively opposed to the two screws (3), two of the scraping heads (5) are provided and respectively opposed to the two suction holes (21), and the sides of the two scraping surfaces (51) adjacent to each other are inclined upward.

9. The dehumidification structure of an extruder according to claim 6, wherein the vacuum pump (7) is fixed on the frame (1), an air suction pipe (71) is connected to an air inlet end of the vacuum pump (7), an air outlet hole (412) is further formed in the bottom surface of the box body (41), and an upper end of the air suction pipe (71) is communicated with the air outlet hole (412).

10. The dehumidifying structure of an extruder of claim 9, wherein a hole diameter of the suction hole (21) is smaller than a hole diameter of the air outlet hole (412).