CN210336833U

CN210336833U - Equipment for producing molecular orientation plastic pipe

Info

Publication number: CN210336833U
Application number: CN201920852435.7U
Authority: CN
Inventors: 李定乾; 杨建中; 陈华; 欧阳司晨; 徐伟
Original assignee: Yibin Tianyi New Material Technology Co ltd; Yibin Tianyuan Group Co Ltd
Current assignee: Yibin Tianyi New Material Technology Co ltd; Yibin Tianyuan Group Co Ltd
Priority date: 2019-06-06
Filing date: 2019-06-06
Publication date: 2020-04-17
Anticipated expiration: 2029-06-06

Abstract

The utility model discloses an equipment for producing molecular orientation plastic tubing, equipment is including guider, the mould that has rigidity and front end housing and the rear end cap that is located the guider both ends, be equipped with locking device and the trompil that is used for fluid medium to pass through on front end housing and the rear end cap respectively, be equipped with the even trompil that is suitable for gas to pass through on the guider, guider axially is located the inside center of mould, affiliated mould include mould and bed die, the mould rear portion is equipped with accepts the section. The molecular orientation plastic pipe is produced by the upper and lower die assembly, so that the friction between the outer wall of the molecular orientation plastic pipe and the inner wall of the die is eliminated; meanwhile, the plastic pipe with a certain bending degree can be produced, and the plastic pipe with a socket can be produced, so that the production cost is greatly saved, and the economic benefit is improved.

Description

Equipment for producing molecular orientation plastic pipe

Technical Field

The utility model belongs to molecule orientation plastic tubing field, especially an equipment that is used for discontinuous production molecule orientation plastic tubing.

Background

If the polymer molecules are stretched in one direction in the temperature range between the glass transition temperature and the melting point during the polymer forming process, the molecular chains therein will be aligned to a large extent in the stretching direction, i.e., the molecules will be oriented during the stretching process. As a result of the orientation and the increased attraction between the molecular chains due to the orientation, the tensile strength, creep resistance, etc. in the direction of stretching of the article after stretching and rapid cooling to room temperature are greatly improved. For films, if the stretching is done in one direction, this process is called single-stage stretching; if the stretching is performed in both the lateral and vertical directions, the stretching is performed in both directions. Orientation of the molecules and retention is achieved by lowering the temperature below the glass transition temperature. The stretched film or other article, upon reheating, will undergo a greater shrinkage in the direction of molecular orientation (i.e., the original direction of stretching).

The molecular oriented plastic pipe is produced through heating plastic pipe to high elastic state, pressure or tension to produce plastic deformation along the stressed direction, stretching the molecular chain from original shrinking state to horizontal or vertical arrangement, and fast lowering the molecular chain to vitrification fixing state, so as to raise the strength, toughness, shock resistance and fatigue resistance of the plastic pipe obviously and save material.

At present, the domestic production of the molecular orientation plastic pipe is mainly a continuous production method, the pipe is moved and stretched axially by a tractor, and then the pipe is expanded along the radial direction by a mandrel to obtain the bi-orientation (orientation) plastic pipe, the equipment mainly expands the pipe by the mandrel, the pipe needs a large traction force in the production process, the size of the mandrel is limited in the process of controlling the traction force, therefore, the radial orientation proportion is small, a high material grade is not suitable to be obtained, and the technology can produce the largest pipe DN630 at present. Currently, chinese patent application, mainly spanish, with discontinuous, secondary production, with chinese patent publication No. CN104162972A, discloses an apparatus and a method for producing molecularly bi-directional plastic tubes, consisting of a mold formed by a central body and a first and a second head connected on opposite sides of the central body, and having rigid and perforated guides axially centered inside the mold, to which a parison tube is longitudinally coupled, the guides being provided with orifices for the passage of an expansion fluid, which causes the expansion of the parison tube against the inner wall of the mold without any heat exchange between the parison tube and the mold. This mould that adopts is overall structure, and its structure can produce the straight line form tubular product of big pipe diameter, and this equipment radial orientation is great, can obtain the plastics tubular product of higher material grade, but need overcome the frictional force between tubular product outer wall and the mould inner wall when taking out the blank pipe, and the tubular product of production can not accomplish disposable flaring, need just can carry out the sleeve pipe installation after the secondary flaring machine-shaping.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that in the prior art, friction force between tubular product outer wall and the mould inner wall needs to be overcome when taking out the blank pipe in the molecular orientation plastic tubing production process, and the tubular product of production can not accomplish disposable flaring, need just can carry out the problem of sleeve pipe installation after secondary flaring machine-shaping, provide an equipment for producing the molecular orientation plastic tubing.

The utility model provides a technical scheme that its technical problem adopted is: the equipment comprises a guide device with rigidity, a mold, a front end cover and a rear end cover, wherein the front end cover and the rear end cover are positioned at two ends of the guide device, the front end cover and the rear end cover are respectively provided with a locking device and an opening for a fluid medium to pass through, the guide device is provided with a uniform opening suitable for gas to pass through, the guide device is axially positioned in the center of the interior of the mold, the mold comprises an upper mold and a lower mold, the rear part of the mold is provided with a bearing section, the inner diameter of the bearing section is larger than that of the front part of the mold, and the upper mold and the lower mold are provided with uniform openings for the fluid medium to pass through.

Preferably, the molecular orientation plastic pipe obtained by expanding the raw pipe in the mold has a socket at one end, and the inside diameter of one end of the socket is slightly larger than the outside diameter of the other end of the molecular orientation plastic pipe.

Preferably, a groove is formed in the bearing section, so that a sealing rubber ring can be placed in one end of the produced molecular orientation plastic pipe.

Preferably, the rear end locking device on the rear end cover can fix the inserted blank tube on the guide device with low holding force, and can also lock the inserted blank tube on the guide device with high holding force.

Preferably, the front end cover is provided with a central bulge which can be inserted into the blank tube, and the central bulge is matched with the front end locking device to lock the blank tube.

Preferably, the central bulge is conical.

Preferably, the device also comprises a vacuum device and a device for providing the auxiliary medium, and the openings on the upper die and the lower die can be connected with the vacuum device or the device for providing the auxiliary medium through pipelines.

Preferably, the rear end cover is provided with a detection element for detecting whether the capillary tube reaches a specified position.

The utility model has the advantages that: the utility model discloses a mould that is used for producing equipment of molecular orientation plastic tubing divide into upper mould and bed die, through the production molecular orientation plastic tubing that carries out of upper and lower compound die, has eliminated the friction of molecular orientation plastic tubing outer wall and mould inner wall, because the plastic tubing just cools off below the vitrification temperature when taking out simultaneously, has prevented like this that to rub and has influenced the plastic tubing outward appearance too;

the utility model discloses a mould adopts the structure to be upper and lower mould structure and can dismantle with equipment, according to the difference of required plastic pipe shape, need not change equipment, selects the upper and lower mould of different shapes, both can produce sharp plastic tubing, also can produce the plastic tubing that has certain camber, also can produce the plastic tubing that has the socket, has practiced thrift manufacturing cost greatly, has improved economic benefits.

Drawings

Fig. 1 is a longitudinal sectional view of an apparatus for producing a molecularly oriented plastic tube according to an embodiment of the present invention;

FIG. 2 is a cross-sectional view of a blank tube introduced during the production of a molecularly oriented plastic tube according to an embodiment of the present invention;

FIG. 3 is a sectional view of the mold closing stage of the embodiment of the present invention for producing a molecular oriented plastic tube;

FIG. 4 is a cross-sectional view of the molecular orientation of the molecular oriented plastic tube produced by the embodiment of the present invention;

FIG. 5 is a cross-sectional view of the embodiment of the present invention in the process of producing a molecular oriented plastic pipe;

FIG. 6 is a cross-sectional view of an orientation tube for producing a molecularly oriented plastic tube according to an embodiment of the present invention;

labeled as: 1. a front end cover; 2. a rear end cap; 3. an upper die; 3', a lower die; 6. the outer surface of the upper die is provided with a hole; 6', opening holes on the outer surface of the lower die; 7. opening a hole on the conical surface of the upper die; 7', opening a hole on the conical surface of the lower die; 8. opening a hole in the guide device; 10. A blank tube; 10', orienting a plastic tube; 11. a front end cap central hole; 12. a central hole of the rear end cover; 21. a front end locking device; 22. a rear locking device; 23. a guide device; 31. a receiving section; 50. an expansion medium; 51. a cooling medium; 52 auxiliary media.

Detailed Description

The present invention will be further explained with reference to the drawings and examples.

Example (b):

as shown in fig. 1, fig. 2, fig. 3, fig. 4, fig. 5 and fig. 6, an apparatus for producing a molecularly oriented plastic tube comprises a rigid guide 23, a mold, and a front end cap 1 and a rear end cap 2 at both ends of the guide 23, wherein the front end cap 1 and the rear end cap 2 are respectively provided with a

locking device

21, 22 and an opening for passing a fluid medium, the guide 23 is provided with a uniform opening 8 suitable for gas to pass, the guide 23 is axially positioned at the center of the inside of the mold, the mold is a mold closing structure and comprises an upper mold 3 and a lower mold 3 ', the rear of the mold is provided with a receiving section 31, the inner diameter of the receiving section 31 is larger than that of the front of the mold, and the upper mold 3 and the lower mold 3 ' are provided with uniform openings 6, 6 ' for passing the fluid medium.

The molecular orientation plastic pipe obtained by expanding the raw pipe 10 in the mold has a socket at one end, and the inside diameter of one end of the socket is slightly larger than the outside diameter of the other end of the molecular orientation plastic pipe. The receiving section 31 is internally provided with a groove, so that a sealing rubber ring can be placed inside one end of the produced molecular orientation plastic pipe. The rear locking device 22 on the rear end cap 2 can be used to fix the inserted blank tube on the guide 23 with a low holding force, or to lock the inserted blank tube 10 on the guide 23 with a high holding force. The front end cover 1 is provided with a central bulge which can be inserted into the interior of the blank tube 10, and the central bulge is matched with the front end locking device 21 to lock the blank tube 10. The central bulge is conical. The device also comprises a vacuum device and a device for providing auxiliary media, and the openings on the upper die and the lower die can be connected with the vacuum device or the device for providing the auxiliary media through pipelines. The rear end cover 2 is provided with a detection element for detecting whether the blank tube 10 reaches a designated position.

The guide device 23 is provided with uniform holes 8 through which the expansion medium 50 and the cooling medium 51 can pass, and is also provided with heating equipment capable of heating the device to a certain temperature, and the device has stronger rigidity and is fixed on the rear end cover 2; the rear end cap 2 of the fixed guide 23 has an opening 12 in its center for the entry of the expanding gas and the cooling gas, to which a locking device 22 is attached, which can be used to fix the inserted blank tube 10 to the guide 23 with a low holding force or to lock it to the guide 23 with a high holding force.

The center of the front end cover 1 is provided with an opening for discharging gas, the end cover is fixedly connected with a front section sealing locking device, a blank tube 10 is locked at the center bulge of the front end cover 1 when the front end cover is started, and the front end cover is matched with the structure and also provided with a device for providing an expansion medium and a device for providing a cooling medium.

The steps of producing the molecular orientation plastic pipe by adopting the equipment are as follows:

step 1: referring to fig. 2, a blank tube 10 of room temperature is introduced from the outside of a guide 23, a detection element on a rear end cap 2 detects that the blank tube has reached a specified position, a rear end sealing and locking device 22 locks the blank tube 10 with a low holding force, the device is placed in an oven, and a heating device in the guide 23 is started to heat the blank tube to a high elastic state as required, wherein the blank tube is an unprocessed blank tube, and the processed tube is called an oriented tube or an oriented plastic tube.

Step 2: as shown in fig. 3, the device is quickly placed in the center of the mold, the upper and lower molds 3, 3' are closed, the front end cover 1 and the front end sealing and locking device 21 fixed thereon are clamped into the blank tube 10, and when the mold and the front end cover reach the preferred positions, the front and

rear locking devices

21, 22 are started to be completely sealed and locked in the equipment with high holding force.

And step 3: as shown in fig. 4, an expansion medium 50, preferably a medium with a certain temperature and high pressure, is introduced into the rear end central hole 12 to prevent the medium from directly exchanging heat with the blank pipe, and simultaneously, the gas between the blank pipe and the inside of the mold is evacuated through holes 6, 6 ', 7' outside the mold, so that the blank pipe is rapidly expanded and molded to the inner cavity of the mold under the high elastic state without exchanging heat.

And 4, step 4: referring to fig. 5, the expansion medium 50 is cut off and introduced into the cooling medium 51, preferably a medium with normal temperature and high pressure, and the excess medium is discharged from the front center hole 11, so as to maintain the pressure inside the oriented plastic pipe 10 ', and prevent the oriented plastic pipe 10' from radial retraction when the oriented plastic pipe is cooled and shaped.

And simultaneously, introducing auxiliary media at the positions of the openings 6 and 6 ' on the outer surfaces of the upper and lower dies 3 and 3 ', wherein the auxiliary media are preferably normal-temperature and low-pressure media, and are discharged through the openings 7 and 7 ' on the conical surfaces of the dies, so that airflow is directly formed between the formed oriented tube 10 ' and the dies, the cooling of the oriented plastic tube 10 ' is accelerated, and the formed airflow is easier to open the dies.

And 5: after the oriented plastic pipe is cooled and shaped, the device is firstly decompressed, then the front end sealing and locking device 21 is completely loosened, the rear end sealing and locking device 22 is in a lower holding force state, then the front end cover 1, the upper die 3 and the lower die 3' are sequentially moved out, the device is moved out of the center of the die, and the oriented pipe is pulled out by a traction device, as shown in fig. 6.

The process is repeated, and the time of each process is reasonably planned through the plurality of rear end covers 2, the guide devices 23 on the rear end covers and the rear end sealing locking devices 22, so that each stage is in an optimal processing state, and the oriented plastic pipe with high radial orientation ratio and high performance is efficiently produced.

Claims

1. An apparatus for producing molecularly oriented plastic tube, the apparatus comprising a rigid guide, a mold, and front and rear end caps at both ends of the guide, the front and rear end caps being provided with a locking device and an opening for passage of a fluid medium, respectively, the guide being provided with uniform openings suitable for passage of gas, the guide being axially centered inside the mold, characterized in that: the die comprises an upper die and a lower die, wherein a bearing section is arranged at the rear part of the die, the inner diameter of the bearing section is larger than that of the front part of the die, and uniform holes for fluid media to pass through are formed in the upper die and the lower die.

2. An apparatus for producing a molecularly oriented plastic tube according to claim 1, wherein: and one end of the molecular orientation plastic pipe obtained by expanding the blank pipe in the die is provided with a socket, and the inner diameter of one end of the socket is larger than the outer diameter of the other end of the molecular orientation plastic pipe.

3. An apparatus for producing a molecularly oriented plastic tube according to claim 1, wherein: the bearing section is internally provided with a groove, so that a sealing rubber ring can be placed in one end of the produced molecular orientation plastic pipe.

4. An apparatus for producing a molecularly oriented plastic tube according to claim 1, wherein: the rear end locking device on the rear end cover can fix the inserted blank tube on the guide device with holding force, and can also lock the inserted blank tube on the guide device with holding force.

5. An apparatus for producing a molecularly oriented plastic tube according to claim 1, wherein: the front end cover is provided with a central bulge which can be inserted into the blank tube, and the central bulge is matched with the front end locking device to lock the blank tube.

6. An apparatus for producing a molecularly oriented plastic tube according to claim 5, wherein: the central bulge is conical.

7. An apparatus for producing a molecularly oriented plastic tube according to claim 1, wherein: the device also comprises a vacuum device and a device for providing auxiliary media, and the openings on the upper die and the lower die can be connected with the vacuum device or the device for providing the auxiliary media through pipelines.

8. An apparatus for producing a molecularly oriented plastic tube according to claim 1, wherein: and the rear end cover is provided with a detection element for detecting whether the capillary tube reaches a specified position.