CN110815802B - Method for manufacturing PVC-O pipe and expansion device thereof - Google Patents
Method for manufacturing PVC-O pipe and expansion device thereof Download PDFInfo
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- CN110815802B CN110815802B CN201910918223.9A CN201910918223A CN110815802B CN 110815802 B CN110815802 B CN 110815802B CN 201910918223 A CN201910918223 A CN 201910918223A CN 110815802 B CN110815802 B CN 110815802B
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 title abstract description 24
- 238000001125 extrusion Methods 0.000 claims abstract description 5
- 239000012530 fluid Substances 0.000 claims description 36
- 238000005452 bending Methods 0.000 claims description 10
- 239000000463 material Substances 0.000 claims description 10
- 238000004891 communication Methods 0.000 claims description 5
- 238000010924 continuous production Methods 0.000 abstract description 7
- 230000008569 process Effects 0.000 abstract description 7
- 238000012545 processing Methods 0.000 description 6
- 210000001161 mammalian embryo Anatomy 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 229920000915 polyvinyl chloride Polymers 0.000 description 3
- 239000004800 polyvinyl chloride Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- 229910001141 Ductile iron Inorganic materials 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 238000004513 sizing Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
- B29C55/22—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of tubes
- B29C55/26—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of tubes biaxial
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2027/00—Use of polyvinylhalogenides or derivatives thereof as moulding material
- B29K2027/06—PVC, i.e. polyvinylchloride
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Shaping Of Tube Ends By Bending Or Straightening (AREA)
Abstract
The invention relates to and discloses a method for manufacturing PVC-O pipe and an expansion device thereof; the method is characterized in that when the PVC-U blank pipe produced by adopting the extrusion method is subjected to biaxial stretching, the used expansion device is an expansion device with the radial sectional area capable of being enlarged or reduced; the expansion device for producing the PVC-O pipe comprises a pull rod and a frame body part which is controlled to be unfolded or folded by the axial movement of the pull rod, when the frame body part is unfolded, the frame body part can form a cone section with gradually increased diameter and a cylinder section with constant diameter, and the cylinder section is connected with one end of the large caliber of the cone section. Because the volume of the expansion device can be enlarged or reduced, the expansion device can be placed in the PVC-U blank pipe in advance in a reduced state, and then the PVC-U blank pipe is expanded and then oriented, so that the PVC-U blank pipe is not required to be cut in advance, the continuous production process of the PVC-O pipe is optimized, and the difficulty of an orientation stage is reduced.
Description
Technical Field
The invention relates to the field of PVC-O pipe production, in particular to an expansion device for manufacturing PVC-O pipes.
Background
PVC-O pipe (also called biaxially oriented polyvinyl chloride) is widely applied in the fields of town water supply and the like in developed countries due to the excellent pressure-bearing performance, economy and safety, and is a substitute of traditional PVC-U pipe, PE pipe, nodular cast iron pipe and the like in the water supply field.
The key point of the PVC-O pipe molding technology is that an orientation processing technology is applied, and the technology is to radially expand and axially stretch the extruded pipe after secondary preheating, so that PVC macromolecular chains in the material are orderly arranged in two expansion directions, the tensile strength of the material is improved, the cracking resistance and crack propagation resistance of the material are improved, and the material has more excellent mechanical properties in the orientation direction. The current PVC-O pipe production method comprises the following steps: and (3) carrying out axial stretching and radial stretching (namely, biaxial stretching) on the PVC-U pipe produced by adopting the extrusion method, so that PVC long-chain molecules in the pipe are regularly arranged in the biaxial direction, and the PVC-O pipe with high strength, high toughness, high impact resistance and fatigue resistance is obtained.
Aiming at the Chinese patent with publication number CN104162972A, the method disclosed by the patent belongs to a discontinuous intermittent production mode, wherein heated blank pipes are introduced into a die, high-temperature and high-pressure gas is introduced to expand the blank pipes, and then low-temperature gas is introduced to cool and mold, so that the oriented pipes are obtained. The two-step process of the patent is complex to realize, has high requirements on uniformity of wall thickness, needs to cut heads at two ends, and has low raw material utilization rate.
Aiming at the Chinese patent with the publication number of CN205167546U, the patent discloses a heat-shrinkable tube expansion die, the production mode when the die is used belongs to a continuous production mode, and when the tube to be processed is heated to a high-elastic state during production and processing, a load is applied to expand the tube, so that small friction force between the inner wall of the heat-shrinkable tube and the sizing section of the expansion die can be realized, the heat-shrinkable tube can slide with small resistance, and is rapidly cooled under the condition of keeping expansion, so that the tube enters a glassy state, and the state can be fixed. And for the chinese patent with publication number CN205467296U, this patent discloses a PVC-O tubing expansion device, and the production mode when using the device also belongs to continuous production mode, and the device surface can form even water film, has played the lubrication effect, has reduced frictional force, has reduced the traction force, and the water-through ability is stronger simultaneously, thereby the energy consumption is lower reduce cost. In the two patents, although the continuous production mode adopted is higher in efficiency, the orientation stage is difficult, and the blank pipe is required to be cut and then oriented, so that the method has the defects of high operation difficulty, more influence of human factors, more complex equipment process, lower automation degree, lower raw material utilization rate, lower qualification rate, higher labor intensity and the like, and is not favorable for automatic production.
Disclosure of Invention
The invention aims to provide a method for manufacturing a PVC-O pipe and the expansion device, which are used for solving the problems that in the continuous production mode, the orientation of a die is difficult, more waste products are generated and the labor intensity is increased.
In order to achieve the above object, in a first aspect, the present invention provides a method for manufacturing a PVC-O pipe, the method being characterized in that, when a PVC-U blank pipe produced by an extrusion method is biaxially stretched, an expansion device having an expandable or contractible radial cross-sectional area is used.
When the expansion device is expanded to the maximum state, the size of the expansion device meets the size requirement of the preformed PVC-O.
Further, when the radial sectional area of the expansion device is expanded to the maximum state, the expansion device can form a cone section with gradually increased diameter and a cylinder section with constant diameter, wherein the cylinder section is connected with one end of the large caliber of the cone section; the outer diameter of the cylindrical section needs to be ensured to be consistent with the inner diameter of the preformed PVC-O pipe.
The method has the beneficial effects that: because the volume of the expansion device is not fixed and can be expanded or reduced, the expansion device can be placed in the PVC-U embryo tube in advance in a reduced state, and then the PVC-U embryo tube is expanded and then orientation processing is started, namely, compared with the patents with publication numbers of CN205167546U and CN205467296U, the PVC-U embryo tube does not need to be sectioned in advance, only the expansion device is placed in the embryo tube, and then the expansion device is expanded and unfolded, and then the orientation processing can be started; therefore, the method optimizes the continuous production process of the PVC-O pipe, reduces the difficulty of an orientation stage, reduces labor intensity, reduces rejection rate, shortens orientation time, and can obviously improve automation degree.
In order to achieve the above object in combination with the above method, in a second aspect, the present invention provides an expansion device for manufacturing PVC-O tubing, comprising a tie rod and a frame portion controlled to be expanded or contracted by axial movement of the tie rod;
When the frame body part is unfolded, the frame body part can form a cone section with gradually increased diameter and a cylinder section with constant diameter, and the cylinder section is connected to one end of the large caliber of the cone section.
The expansion device has the beneficial effects that: the frame body part can be unfolded or folded, and when the frame body part is folded, the frame body part can be put into the PVC-U blank pipe in advance under the condition of not cutting the pipe, and then the frame body part is unfolded, so that the orientation processing can be performed; therefore, when the expansion device is used together with the method, the continuous production process of the PVC-O pipe is optimized, the difficulty of an orientation stage is reduced, the labor intensity is also reduced, the rejection rate is reduced, the orientation time is shortened, and the automation degree is also obviously improved.
Further, the expanding device also comprises a fixed end and a movable end; the pull rod passes through the fixed end along the axis and is fixedly connected with the movable end, and the pull rod can axially and freely move relative to the fixed end; the frame body part is simultaneously and fixedly connected with the fixed end and the movable end; when the pull rod drives the movable end to gradually move to one side close to the fixed end, the frame body part is gradually unfolded, and when the pull rod drives the movable end to gradually move to one side far away from the fixed end, the frame body part is gradually folded.
Further, the frame part includes:
The brackets are arranged at equal intervals around the fixed end, one end of each bracket is hinged with the fixed end, and the other end of each bracket is bent towards the axis direction of the bracket body part to form a bending section;
the connecting rods are equal to the brackets in number, are arranged at equal intervals around the movable end heads, one end of each connecting rod is hinged with the movable end head, and the other end of each connecting rod is hinged with the corresponding bracket;
The auxiliary part is connected between the brackets, is made of flexible materials and can be folded or tightened;
When the frame body is partially unfolded, the cone section is formed by a part between the bending section and the fixed end head and a tightening auxiliary part, and the cylindrical section is formed by the bending section and the auxiliary part.
Further, a first fluid channel extending axially is arranged in the center of the pull rod, a second fluid channel extending axially is arranged in the center of each support, and a plurality of openings for fluid to flow out are formed in one side, away from the axis of the support body part, of each support;
wherein each of said second fluid passages is in communication with said first fluid passage.
When the pipe is oriented, fluid (such as gas) can be introduced from the first fluid channel, and can flow out from each opening after passing through the second fluid channel, so that the flowing fluid can play a role in reducing friction force so as to reduce resistance when the pipe moves.
Further, when the frame portions are collapsed, the maximum outer diameter of the frame portions is less than the inner diameter of the pre-processed blank tube.
Drawings
FIG. 1 is a schematic illustration of the stent of example 2 in a collapsed state and with a PVC-U tubing set;
FIG. 2 is a schematic view of the stent of example 2 in the deployed state and being oriented;
FIG. 3 is an enlarged view at A in FIG. 2;
FIG. 4 is a schematic illustration of the stent of example 3 in a collapsed state and with PVC-U tubing;
FIG. 5 is a schematic view of the stent of example 3 in an expanded state and being oriented;
Marked in the figure as: the device comprises a 1-pull rod, a 11-first fluid channel, a 2-frame part, a 21-support, a 211-bending section, a 212-second fluid channel, a 213-opening, a 22-connecting rod, a 23-auxiliary part, a 31-fixed end, a 32-movable end, a 4-PVC-U blank pipe, a 5-air bag, a 6-pull rod, a 7-air conveying pipeline, an 8-connecting part, an a-cone section and a b-cylinder section.
Detailed Description
In order that the above-recited objects, features and advantages of the present application will be more clearly understood, a more particular description of the application will be rendered by reference to the appended drawings and appended detailed description. It should be noted that, without conflict, the embodiments of the present application and features in the embodiments may be combined with each other.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced otherwise than as described herein, and therefore the scope of the present invention is not limited to the specific embodiments disclosed below.
Example 1:
The present embodiment provides a method for manufacturing a PVC-O pipe, which is characterized in that when a PVC-U blank pipe produced by an extrusion method is biaxially stretched, an expansion device having an expandable or contractible radial cross-sectional area (i.e., the volume of the expansion device is expandable or contractible radially) is used.
When the expansion device is expanded to the maximum state, the expansion device can form a cone section with gradually increased diameter and a cylinder section with constant diameter, and the cylinder section is connected with one end of the large caliber of the cone section.
And when the expansion device is specifically designed according to the manufacturing requirement, the maximum outer diameter of the expansion device when the expansion device is contracted to the minimum state should be determined according to the inner diameter of the PVC-U blank pipe so that the expansion device can be easily placed in the PVC-U blank pipe, and the outer diameter of the cylindrical section when the expansion device is expanded to the maximum state should be determined according to the inner diameter of the preformed PVC-O pipe, namely, the outer diameter of the cylindrical section is required to be ensured to be basically consistent with the inner diameter of the preformed PVC-O pipe.
In the method of example 1, the stent plays an extremely important role. Therefore, in order to achieve this, the inventors have also purposely designed this stent, taking example 2 and example 3 as examples, two completely different types of stent were designed by the inventors, wherein example 1 is a mechanical structure type stent and example 2 is a gas expansion type stent. The specific structure is as follows:
Example 2:
Referring to fig. 1 and 2, the present embodiment provides an expansion device for manufacturing PVC-O tubing, comprising a tie rod 1 and a frame portion 2 controlled to be expanded or contracted by axial movement of the tie rod 1; when the frame body part 2 is unfolded, the frame body part 2 forms a cone section a with gradually increased diameter and a cylinder section b with constant diameter, and the cylinder section b is connected with one end of the cone section a with large caliber; when the frame body part 2 is folded, the maximum outer diameter of the frame body part 2 is smaller than the inner diameter of the prefabricated PVC-U blank pipe.
Preferably, the expanding device further comprises a fixed end 31 and a movable end 32 which are arranged at intervals; the pull rod 1 passes through the fixed end 31 along the axis and is fixedly connected with the movable end 32, and the pull rod 1 can move freely relative to the fixed end 31 in the axial direction; the frame body part 2 is simultaneously connected with the fixed end 31 and the movable end 32; when the pull rod 1 drives the movable end 32 to gradually move to the side close to the fixed end 31, the frame body part 2 is gradually unfolded, and when the pull rod 1 drives the movable end 32 to gradually move to the side far away from the fixed end 31, the frame body part 2 is gradually folded.
The structural form of the frame body part 2 can be various, and the following is a simple and stable frame body part 2 with a structure similar to an umbrella, which is specifically as follows:
the frame portion 2 includes a plurality of brackets 21, a plurality of connecting rods 22, and an auxiliary portion 23.
Each bracket 21 is arranged around the fixed end 31 at equal intervals, one end of each bracket 21 is hinged with the fixed end 31, and the other end is bent towards the axis direction of the frame body part 2 to form a bending section 211.
The number of the connecting rods 22 is consistent with that of the brackets 21, the connecting rods 22 are arranged at equal intervals around the movable end heads 32, one end of each connecting rod 22 is hinged with the movable end head 32, and the other end is hinged with the corresponding bracket 21.
The auxiliary parts 23 are connected between the brackets 21, and the auxiliary parts 23 are made of flexible materials and can be folded or stretched; the auxiliary part 23 is similar to the umbrella cover of the umbrella, and the auxiliary part 23 can be made of the same material as the umbrella cover, when the frame body part 2 is folded, the auxiliary part 23 is in a folded state, and when the frame body part 2 is unfolded to the maximum state, the auxiliary part 23 is in a tense state.
Wherein, when the frame body part 2 is unfolded, the cone section a is formed by the part between the bending section 211 and the fixed end 31 and the tightening auxiliary part 23, and the cylinder section b is formed by the bending section 211 and the tightening auxiliary part 23.
In order to ensure that the resistance to movement of the pipe is small during orientation processing, the following design can be performed:
referring to fig. 2 and 3, a first fluid channel 11 extending axially is disposed in the center of the pull rod 1, a second fluid channel 212 extending axially is disposed in the center of each bracket 21, and a plurality of openings 213 for fluid to flow out are formed on one side of each bracket 21 facing away from the axis of the frame body 2; wherein each second fluid passage 212 is in communication with the first fluid passage 11.
When the pipe is oriented, fluid (such as gas) can be introduced from the first fluid channel 11, and flows out from the openings 213 after passing through the second fluid channel 212, so that the flowing fluid can be scattered between the outer layer of the frame body part 2 and the inner wall of the pipe, and the effect of reducing friction force is achieved, thereby achieving the purpose of reducing the moving resistance of the pipe. Wherein the arrows in fig. 2 and 3 indicate the flow direction of the fluid.
In addition, since the bracket 21 is rotatable relative to the fixed end 31, in order to ensure that the second fluid channel 212 can be communicated with the first fluid channel 11 when the bracket body 2 is unfolded or folded, the second fluid channel 212 can be formed by adopting a hollow hose, the hose is wrapped in the bracket 21, the end is communicated with the first fluid channel 11, and the inner cavity of the hose is the second fluid channel 212; with the hose design, the second fluid passage 212 is always in communication with the first fluid passage 11 when the bracket 21 is rotated. Of course, from a structural design point of view, the second fluid passage 212 can be kept in communication with the first fluid passage 11 at all times.
The application method of the embodiment is as follows:
When the frame body part 2 is in a folded state, the frame body part 2 is plugged into the PVC-U blank pipe 4 (see figure 1), then the PVC-U blank pipe 4 is heated to a high-elastic state, then the fixed end head 31 is kept fixed, then the pull rod 1 is pulled to enable the movable end head 32 to move to the side close to the fixed end head 31, the frame body part 2 can be converted into an unfolding state, then traction force is applied to enable the PVC-U blank pipe 4 to move to the side of a cylindrical section b of the frame body part 2, in the moving process, the PVC-U blank pipe 4 gradually climbs and expands in a cone section a of the frame body part 2, orientation is finished (namely, bidirectional stretching is finished), and then cooling and shaping are finished in the cylindrical section b, so that the PVC-O pipe can be processed (see figure 2); when production is stopped, the pull rod 1 is pushed to enable the movable end head 32 to move to the side far away from the fixed end head 31, so that the frame body part 2 can be converted into a furled state, and then the frame body part 2 can be taken out from the pipe; if necessary, gas may also be introduced into the first fluid passage 212 to reduce resistance to movement of the tubing.
Example 3:
Referring to fig. 4 and 5, the present embodiment provides another expansion device for manufacturing PVC-O tubing, which includes an air bag 5, a tie rod 6, and a gas pipe 7.
After being filled with gas, the air bag 5 can expand to form a cone section a with gradually increased diameter and a cylinder section b with constant diameter, wherein the cylinder section b is positioned at one end of the cone section a with large caliber, and the inner parts of the cone section a and the cylinder section b are cavities of the air bag 5. When the air bag 5 is specifically manufactured, the specification and the size of the air bag 5 need to be determined according to the inner diameter of the PVC-U blank pipe and the inner diameter of the PVC-O pipe which is preformed, namely, on one hand, the air bag 5 can be smoothly placed into the PVC-U blank pipe when not inflated, on the other hand, the diameter of the cylindrical section b of the air bag 5 meets the expansion requirement after the air bag is inflated completely. Wherein, the selection of the materials of the air bag 5 also needs to ensure: after the air bag 5 is inflated, the external structural characteristics of high hardness and difficult flattening can be kept under a certain external pressure state, and the air bag can be made of rubber materials.
The pull rod 6 is connected to one end of the air bag 5. The pull rod 5 has the functions of: the air bag 5 is convenient to be put into the pipe or taken out from the pipe.
The gas pipeline 7 is communicated with the inner cavity of the air bag 5 and is used for inflating the air bag 5.
Preferably, in order to facilitate the connection of the tie rod 6 with the balloon 5, the expansion device further comprises a connection portion 8, one side of the connection portion 8 being connected with the balloon 5, and the other side being connected with the tie rod 6 for engaging the tie rod 6 with the balloon 5.
The gas pipeline 7 can be an independent gas pipe, is directly connected with the air bag 5, and can be attached to the pull rod 6 or built in the pull rod 6. However, in general, for the sake of simplifying the structure, it is preferable that the gas pipe 7 is built in the tie rod 6, that is, as shown in fig. 4 and 5, the gas pipe 7 is connected to the inner cavity of the airbag 5 after penetrating through the tie rod 6 and the connection portion 8.
Preferably, the pull rod 6 is connected to the small caliber end of the cone section a of the air bag 5.
The application method of the embodiment is as follows:
firstly, the air bag 5 is plugged into the PVC-U blank pipe 4 in an uninflated state (see fig. 4), then the PVC-U blank pipe 4 is heated to a high-elastic state, then the air bag 5 is inflated by means of the air pipe 7, the air bag 5 is inflated, then traction force is applied to enable the PVC-U blank pipe 4 to move to the side of the cylindrical section b of the air bag 5, in the moving process, the PVC-U blank pipe 4 gradually climbs and expands in the conical section a of the air bag 5, orientation is finished (namely, biaxial stretching is finished), and then cooling shaping is finished in the cylindrical section b, so that the PVC-O pipe can be processed (see fig. 5); when the production is stopped, the gas in the air bag 5 is discharged, the air bag 5 is restored to the initial state, and then the air bag is taken out from the pipe; wherein the arrows in fig. 5 indicate the flow direction of the gas.
In the description of the present invention, the terms "connected," "mounted," "secured," and the like are to be construed broadly, and for example, "connected" may be a fixed connection, a removable connection, or an integral connection; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (4)
1. The expansion device for manufacturing the PVC-O pipe is characterized by comprising a pull rod (1) and a frame body part (2) which is controlled to be unfolded or folded by the axial movement of the pull rod (1); the device also comprises fixed ends (31) and movable ends (32) which are arranged at intervals; the pull rod (1) passes through the fixed end (31) along the axis and is fixedly connected with the movable end (32), and the pull rod (1) can axially and freely move relative to the fixed end (31); the frame body part (2) is simultaneously connected with the fixed end (31) and the movable end (32); when the pull rod (1) drives the movable end (32) to gradually move to the side close to the fixed end (31), the frame body part (2) can be gradually unfolded, and when the pull rod (1) drives the movable end (32) to gradually move to the side far from the fixed end (31), the frame body part (2) can be gradually folded;
The frame body part (2) comprises a plurality of brackets (21), a plurality of connecting rods (22) and an auxiliary part (23), wherein the brackets (21) are arranged at equal intervals around the fixed end head (31), one end of each bracket (21) is hinged with the fixed end head (31), and the other end is bent towards the axis direction of the frame body part (2) to form a bending section (211);
the number of the connecting rods (22) is consistent with that of the brackets (21), the connecting rods (22) are arranged at equal intervals around the movable end heads (32), one end of each connecting rod (22) is hinged with the movable end head (32), and the other end is hinged with the corresponding bracket (21);
the auxiliary part (23) is connected between the brackets (21), and the auxiliary part (23) is made of flexible materials and can be folded or stretched; when the frame body part (2) is folded, the auxiliary part (23) is in a folded state, and when the frame body part (2) is unfolded to a maximum state, the auxiliary part (23) is in a tense state; when the frame body part (2) is unfolded, the frame body part (2) can form a cone section (a) with gradually increased diameter and a cylinder section (b) with constant diameter, the cylinder section (b) is connected to one end of the cone section (a) with large caliber, the cone section (a) is formed by a part between the bending section (211) and the fixed end (31) and a tightening auxiliary part (23), and the cylinder section (b) is formed by the bending section (211) and the tightening auxiliary part (23).
2. Expansion device for manufacturing PVC-O tubing according to claim 1, characterized in that the centre of the tie rod (1) is provided with an axially extending first fluid channel (11), the centre of each bracket (21) is provided with an axially extending second fluid channel (212), and that the side of each bracket (21) facing away from the axle centre of the frame body part (2) is provided with a plurality of openings (213) for fluid outflow;
wherein each of said second fluid passages (212) is in communication with said first fluid passage (11).
3. Expansion device for producing PVC-O tubing according to claim 1 or 2, characterized in that the maximum outer diameter of the frame part (2) is smaller than the inner diameter of the pre-processed blank tube when the frame part (2) is collapsed.
4. A method for producing a PVC-O pipe, characterized in that when a PVC-U blank produced by an extrusion method is biaxially stretched, the expansion device used is the expansion device for producing a PVC-O pipe according to any one of claims 1 to 3.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910918223.9A CN110815802B (en) | 2019-09-26 | 2019-09-26 | Method for manufacturing PVC-O pipe and expansion device thereof |
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| CN201910918223.9A CN110815802B (en) | 2019-09-26 | 2019-09-26 | Method for manufacturing PVC-O pipe and expansion device thereof |
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| CN110815802A CN110815802A (en) | 2020-02-21 |
| CN110815802B true CN110815802B (en) | 2024-05-24 |
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| CN112186466B (en) * | 2020-09-28 | 2021-11-19 | 深圳市特拉利线簧端子技术有限公司 | A insulating cover expanding unit for battery terminal protection |
| CN113021855B (en) * | 2021-03-04 | 2022-12-30 | 公元管道(浙江)有限公司 | Biaxial stretching equipment for pipe processing and stretching method thereof |
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| CN207088472U (en) * | 2017-08-23 | 2018-03-13 | 黑龙江省科学院技术物理研究所 | Thermal shrinkable sleeve extension fixture |
| CN210999968U (en) * | 2019-09-26 | 2020-07-14 | 宜宾天亿新材料科技有限公司 | Expansion device for manufacturing PVC-O pipe |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1990002644A1 (en) * | 1988-09-15 | 1990-03-22 | Vinidex Tubemakers Pty. Limited | Method of pipe manufacture |
| CN1798646A (en) * | 2003-04-08 | 2006-07-05 | 温尼德斯有限公司 | Method and apparatus for control of plastics tube orientation process |
| CN207088472U (en) * | 2017-08-23 | 2018-03-13 | 黑龙江省科学院技术物理研究所 | Thermal shrinkable sleeve extension fixture |
| CN210999968U (en) * | 2019-09-26 | 2020-07-14 | 宜宾天亿新材料科技有限公司 | Expansion device for manufacturing PVC-O pipe |
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| CN110815802A (en) | 2020-02-21 |
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