CN110815802A - 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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- CN110815802A CN110815802A CN201910918223.9A CN201910918223A CN110815802A CN 110815802 A CN110815802 A CN 110815802A CN 201910918223 A CN201910918223 A CN 201910918223A CN 110815802 A CN110815802 A CN 110815802A
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- 238000000034 method Methods 0.000 title claims abstract description 30
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 27
- 238000001125 extrusion Methods 0.000 claims abstract description 5
- 239000012530 fluid Substances 0.000 claims description 38
- 239000000463 material Substances 0.000 claims description 9
- 238000005452 bending Methods 0.000 claims description 8
- 238000004891 communication Methods 0.000 claims description 5
- 230000008569 process Effects 0.000 abstract description 10
- 238000012545 processing Methods 0.000 abstract description 8
- 238000010924 continuous production Methods 0.000 abstract description 7
- 230000005540 biological transmission Effects 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 229920000915 polyvinyl chloride Polymers 0.000 description 3
- 239000004800 polyvinyl chloride Substances 0.000 description 3
- 230000002457 bidirectional effect Effects 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000005516 engineering process Methods 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
- 229920002554 vinyl polymer Polymers 0.000 description 2
- 229910001141 Ductile iron Inorganic materials 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000005461 lubrication Methods 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
- 238000003892 spreading Methods 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- 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
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- 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
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- 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 tubular product and an expansion device thereof; the method is characterized in that when the PVC-U billet tube produced by the extrusion method is subjected to biaxial tension, the used expansion device is an expansion device with the radial sectional area capable of being expanded 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, wherein 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 with large caliber of the cone section. Because the volume of the expansion device can be expanded or reduced, the expansion device can be placed into the PVC-U blank tube in advance in a reduced state, and then the PVC-U blank tube is expanded and then subjected to orientation processing, so that the PVC-U blank tube does not need to be cut in advance, the continuous production process of the PVC-O tube is optimized, and the difficulty in the 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 biaxial orientation polyvinyl chloride) is widely applied in the fields of urban water supply and the like in developed countries due to its excellent 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 of the PVC-O pipe forming technology lies in the application of the orientation processing technology, which is to perform radial expansion and axial stretching on the pipe subjected to secondary preheating to ensure that PVC macromolecular chains in the material are orderly arranged in two expansion directions, thereby improving the tensile strength of the material, improving the cracking resistance and crack propagation resistance of the material and ensuring that the material obtains more excellent mechanical properties in the orientation direction. The current production method of the PVC-O pipe comprises the following steps: the PVC-U pipe produced by the extrusion method is axially stretched and radially stretched (namely, biaxially stretched), so that PVC long-chain molecules in the pipe are regularly arranged in a 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 the publication number of CN104162972A, the method disclosed by the patent belongs to a discontinuous intermittent production mode, heated blank tubes are introduced into a mould, high-temperature and high-pressure gas is introduced to expand the blank tubes, and then low-temperature gas is introduced to cool and form, so that oriented tubes are obtained. The two-step process of the patent is complex to realize, has high requirements on the uniformity of wall thickness, needs to cut heads at two ends, and has low utilization rate of raw materials.
The patent discloses a heat shrinkable tube expanding mould, aiming at the Chinese patent with the publication number of CN205167546U, the production mode when the mould is used belongs to a continuous production mode, when in production and processing, a pipe to be processed is heated to a high elastic state, a load is applied to expand the pipe, so that the lower friction force between the inner wall of the heat shrinkable tube and a sizing section of the expanding mould can be realized, the heat shrinkable tube can slide with small resistance, and is rapidly cooled under the condition of keeping the expansion, so that the heat shrinkable tube enters a glass state, and the state can be fixed. And to the chinese patent of publication No. CN205467296U, this patent discloses a PVC-O pipe expansion device, the production mode when using this device also belongs to the continuous production mode, the surface of this device can form uniform water film, playing a role in lubrication, reducing friction, reducing traction force, and at the same time, the water capacity is stronger, the energy consumption is lower and thus the cost is reduced. In the above two patents, although the continuous production mode has high efficiency, the orientation stage is difficult, and the blank tube needs to be cut first and then oriented, which has the disadvantages of high operation difficulty, more influence of human factors, complex equipment and process, low automation degree, low raw material utilization rate, low qualification rate, high labor intensity and the like, so that the method is not very beneficial to automatic production.
Disclosure of Invention
The invention aims to provide a method for manufacturing a PVC-O pipe and an expansion device, and aims to solve the problems that in the continuous production mode, the orientation of a mould is difficult, waste products are more, and the labor intensity is increased.
In order to achieve the above objects, in a first aspect, the present invention provides a method for manufacturing a PVC-O pipe, the method being characterized in that, in biaxially stretching a PVC-U billet produced by an extrusion method, an expansion device having an expanded or reduced radial cross-sectional area is used.
When the expansion device is contracted to the minimum state, the expansion device can be easily plugged into the PVC-U billet tube, and when the expansion device is expanded to the maximum state, the size of the expansion device meets the size requirement of the pre-processed and molded 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 to one end of the cone section with large caliber; the outer diameter of the cylindrical section needs to be ensured to be consistent with the inner diameter of the pre-processed and molded 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 into the PVC-U blank tube in advance in a reduced state, and then the PVC-U blank tube is expanded and then the orientation processing is started, namely, compared with the patents with publication numbers of CN205167546U and CN205467296U, the PVC-U blank tube is not required to be cut in advance, the expansion device is only placed into the blank tube and then expanded 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 the orientation stage, reduces the labor intensity, reduces the rejection rate, shortens the orientation time and obviously improves the automation degree.
In order to achieve the above object in cooperation with the above method, in a second aspect, the present invention provides an expanding device for manufacturing PVC-O pipes, comprising a pull rod and a frame body portion 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 the diameter gradually increased and a cylinder section with the 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 can be put into a PVC-U blank tube in advance under the condition of not cutting the tube during folding, and then the frame body part is unfolded to carry out orientation processing; therefore, when the expanding device is used in cooperation with the method, the continuous production process of the PVC-O pipe is optimized, the difficulty of the orientation stage is reduced, the labor intensity is reduced, the rejection rate is reduced, the orientation time is shortened, and the automation degree can be obviously improved.
Furthermore, the expansion device also comprises a fixed end head and a movable end head; the pull rod penetrates through the fixed end head along the axis and is fixedly connected with the movable end head, and the pull rod can axially and freely move relative to the fixed end head; the frame body part is simultaneously kept connected with the fixed end and the movable end; and, when the pull rod orders about the movable end to move to the side that is close to fixed end gradually, the support body part can expand gradually, when the pull rod orders about the movable end to move to the side of keeping away from fixed end gradually, the support body part can draw in gradually.
Further, the frame body part includes:
the support bodies are arranged around the fixed end head at equal intervals, one end of each support body is hinged with the fixed end head, and the other end of each support body is bent towards the axis direction of the support body part to form a bending section;
the number of the connecting rods is consistent with that of the brackets, the connecting rods are arranged around the movable end head at equal intervals, 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 among the brackets and made of flexible materials and can be folded or tightened;
when the frame body part is unfolded, the cone section is formed by the part between the bending section and the fixed end head and the tightened auxiliary part, and the cylinder section is formed by the bending section and the auxiliary part.
Furthermore, 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 of each support, which is far away from the axle center of the support body part;
wherein each of said second fluid passageways is in communication with said first fluid passageway.
During orientation processing, fluid (such as gas) can be introduced from the first fluid channel, the fluid can flow out from each opening after passing through the second fluid channel, and the flowing fluid can play a role in reducing friction force so as to reduce resistance when the pipe moves.
Further, when the frame body part is folded, the maximum outer diameter of the frame body part is smaller than the inner diameter of the preprocessed embryonic tube.
Drawings
FIG. 1 is a schematic view of the stent of example 2 in a collapsed state and placed in a PVC-U tube;
FIG. 2 is a schematic view of the stent of example 2 in a deployed state and in the process of orientation;
FIG. 3 is an enlarged view at A in FIG. 2;
FIG. 4 is a schematic view of the stent of example 3 in a collapsed state and placed in a PVC-U tube;
FIG. 5 is a schematic view of the stent of example 3 in an expanded state and undergoing orientation processing;
labeled as: 1-pull rod, 11-first fluid channel, 2-frame part, 21-bracket, 211-bending section, 212-second fluid channel, 213-opening, 22-connecting rod, 23-auxiliary part, 31-fixed end, 32-movable end, 4-PVC-U blank tube, 5-air bag, 6-pull rod, 7-air conveying pipeline, 8-connecting part, a-cone section and b-cylinder section.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
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 specifically described, and thus the scope of the present invention is not limited by the specific embodiments disclosed below.
Example 1:
this embodiment provides a method for manufacturing a PVC-O pipe, which is characterized in that, when a PVC-U raw pipe produced by an extrusion method is biaxially stretched, an expansion device having an enlarged or reduced radial cross-sectional area (i.e., the volume of the expansion device is radially expandable or contractible) is used.
And 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 to one end of the cone section with large caliber.
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 reduced to the minimum state is determined according to the inner diameter of the PVC-U blank tube, so that the expansion device can be easily placed into the PVC-U blank tube, and the outer diameter of the cylindrical section when the expansion device is expanded to the maximum state is determined according to the inner diameter of the pre-processed and molded PVC-O pipe, namely, the outer diameter of the cylindrical section is required to be basically consistent with the inner diameter of the pre-processed and molded PVC-O pipe.
In the method of example 1, the stent plays a very important role. Therefore, in order to achieve this method successfully, the inventors have also designed the stent intentionally, and as exemplified in examples 2 and 3, the inventors have designed two types of completely different stents, of which example 1 is a mechanical structure type stent and example 2 is a gas inflation type stent. The specific structure is detailed below:
example 2:
referring to fig. 1 and 2, the present embodiment provides an expanding device for manufacturing PVC-O pipes, which comprises a pull rod 1 and a frame body part 2 controlled to be unfolded or folded by the axial movement of the pull rod 1; 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, and the cylinder section b is connected to one end of the cone section a with a 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 preprocessed PVC-U billet tube.
Preferably, the expansion device further comprises a fixed end head 31 and a movable end head 32 which are arranged at intervals; the pull rod 1 penetrates through the fixed end head 31 along the axis and then is fixedly connected with the movable end head 32, and the pull rod 1 can freely move axially relative to the fixed end head 31; the frame body part 2 is simultaneously kept connected with the fixed end head 31 and the movable end head 32; when the pull rod 1 drives the movable end 32 to gradually move towards 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 towards the side far away from the fixed end 31, the frame body part 2 can be gradually folded.
Wherein, the structural style of the frame body part 2 can be various, the frame body part 2 which is similar to an umbrella in structure and has simple and stable structure is listed as follows:
the frame part 2 includes a plurality of brackets 21, a plurality of connecting bars 22, and an auxiliary part 23.
Each support 21 is arranged around the fixed end 31 at equal intervals, one end of each support 21 is hinged to 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 around the movable end heads 32 at equal intervals, one end of each connecting rod 22 is hinged with the movable end head 32, and the other end of each connecting rod 22 is hinged with the corresponding bracket 21.
The auxiliary parts 23 are connected among the brackets 21, and the auxiliary parts 23 are made of flexible materials and can be folded or tightened; the auxiliary portion 23 is similar to the umbrella cover of an umbrella, and the material of the auxiliary portion 23 can also be the same as the umbrella cover of an umbrella, when the frame portion 2 is folded, the auxiliary portion 23 is folded, and when the frame portion 2 is unfolded to the maximum, the auxiliary portion 23 is tightened.
When the frame body part 2 is unfolded, the cone section a is formed by the bent section 211 and the fixing end 31 and the tightened auxiliary part 23, and the cylinder section b is formed by the bent section 211 and the tightened auxiliary part 23.
In order to ensure that the resistance to the movement of the pipe during the orientation process is small, the following design can be carried out:
referring to fig. 2 and 3, an axially extending first fluid channel 11 is disposed at the center of the drawbar 1, an axially extending second fluid channel 212 is disposed at the center of each support 21, and a plurality of openings 213 for flowing out fluid are formed at one side of each support 21 away from the axis of the frame part 2; wherein each second fluid passage 212 is in communication with the first fluid passage 11.
During the orientation process, fluid (such as gas) can be introduced from the first fluid channel 11, the fluid can flow out from the openings 213 after passing through the second fluid channel 212, and the flowing fluid can spread between the outer layer of the frame body part 2 and the inner wall of the pipe to play a role in reducing friction force, 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 passage 212 can be communicated with the first fluid passage 11 when the frame body part 2 is unfolded or folded, the second fluid passage 212 can be formed by a hollow hose which is wrapped in the bracket 21 and the end of which is communicated with the first fluid passage 11, and the inner cavity of the hose is the second fluid passage 212; with the flexible tube design, the second fluid passage 212 can always be in communication with the first fluid passage 11 when the bracket 21 is rotated. Of course, the second fluid channel 212 can be always in communication with the first fluid channel 11 in view of the structural design.
The method of use of this example is as follows:
when the frame body part 2 is in a furled state, the frame body part 2 is plugged into a PVC-U tubular billet 4 (see figure 1), then the PVC-U tubular billet 4 is heated to a high elastic state, then a fixed end 31 is kept fixed, then a pull rod 1 is pulled to enable a movable end 32 to move towards one side close to the fixed end 31, so that the frame body part 2 is converted into a spreading state, then traction force is applied to enable the PVC-U tubular billet 4 to move towards one side of a cylindrical section b of the frame body part 2, in the moving process, the PVC-U tubular billet 4 gradually climbs and expands at a conical section a of the frame body part 2 to complete orientation (namely complete bidirectional stretching), and then cooling and shaping are completed at the cylindrical section b, so that a PVC-O pipe (see figure 2) can be processed; when production stops, 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, the frame body part 2 can be converted into a furled state, and then the frame body part 2 can be taken out of the pipe; if necessary, gas may 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 a balloon 5, a pull rod 6 and a gas pipe 7.
When the gas is filled, the airbag 5 can expand to form a cone section a with a gradually increased diameter and a cylinder section b with a constant diameter, the cylinder section b is positioned at one end with a large caliber of the cone section a, and the inner parts of the cone section a and the cylinder section b are cavities of the airbag 5. When the air bag 5 is specifically manufactured, the specification and the size of the air bag are determined according to the inner diameter of a PVC-U blank tube and the inner diameter of a pre-processed and molded PVC-O tube, namely, on one hand, the air bag 5 can be smoothly placed into the PVC-U blank tube when the air bag is not inflated, and 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 fully inflated. Wherein, the material selection of gasbag 5 still needs to guarantee: after the air bag 5 is expanded, the external structural characteristics of high hardness and difficult flattening can be kept under a certain external pressure, and for example, the air bag can be made of rubber.
The pull rod 6 is connected to one end of the air bag 5. The function of the pull rod 5 is: the air bag 5 can be conveniently put into or taken out of the tube.
The gas transmission 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 stent further comprises a connecting portion 8, one side of the connecting 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 transmission pipeline 7 can be an independent gas pipe and is directly connected with the air bag 5, and can also be attached to the pull rod 6 or be arranged in the pull rod 6. However, in general, in order to simplify the structure, it is preferable to install the gas transmission pipe 7 in the pull rod 6, that is, as shown in fig. 4 and 5, the gas transmission pipe 7 penetrates the pull rod 6 and the connecting portion 8 and then communicates with the inner cavity of the airbag 5.
Preferably, the tie rod 6 is connected to the small-diameter end of the cone segment a of the balloon 5.
The method of use of this example is as follows:
firstly, an air bag 5 is plugged into a PVC-U (polyvinyl chloride-U) blank tube 4 in an uninflated state (see figure 4), then the PVC-U blank tube 4 is heated to a high elastic state, then the air bag 5 is aerated by an air conveying pipeline 7 to expand the air bag 5, then traction force is applied to enable the PVC-U blank tube 4 to move towards one side of a cylindrical section b of the air bag 5, in the moving process, the PVC-U blank tube 4 gradually climbs and expands on a conical section a of the air bag 5 to complete orientation (namely, bidirectional stretching), then cooling and shaping are completed on the cylindrical section b, and then a PVC-O (polyvinyl chloride-O) pipe can be processed (see figure 5); when production stops, gas in the air bag 5 is released to restore the air bag 5 to an 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 "connect", "mount", "fix", etc. should be interpreted broadly, for example, the term "connect" may be a fixed connection, a detachable connection, or an integral connection; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. The method for manufacturing the PVC-O pipe is characterized in that when the PVC-U billet tube produced by the extrusion method is subjected to biaxial tension, the used expansion device is an expansion device with the radial sectional area capable of being expanded or reduced.
2. The method for manufacturing PVC-O pipe according to claim 1, wherein the expanding means forms a tapered section with a gradually increasing diameter and a cylindrical section with a constant diameter when the radial sectional area of the expanding means is expanded to the maximum state, wherein the cylindrical section is connected to one end of the tapered section with a larger diameter.
3. 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);
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, and the cylinder section (b) is connected to one end of the cone section (a) with a large caliber.
4. The stent for manufacturing PVC-O pipes according to claim 3, further comprising a fixed end (31) and a movable end (32); the pull rod (1) penetrates through the fixed end head (31) along the axis and then is fixedly connected with the movable end head (32), and the pull rod (1) can axially and freely move relative to the fixed end head (31); the frame body part (2) is simultaneously kept connected with the fixed end head (31) and the movable end head (32); and when the pull rod (1) drives the movable end (32) to gradually move to one 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 one side far away from the fixed end (31), the frame body part (2) can be gradually folded.
5. Expansion device for the production of PVC-O pipes according to claim 4, characterized in that said frame portion (2) comprises:
the support frames (21) are arranged around the fixed end head (31) at equal intervals, one end of each support frame (21) is hinged with the fixed end head (31), and the other end of each support frame (21) 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 around the movable end heads (32) at equal intervals, one end of each connecting rod (22) is hinged with the movable end head (32), and the other end of each connecting rod is hinged with the corresponding bracket (21);
the auxiliary parts (23) are connected among the brackets (21), and the auxiliary parts (23) are made of flexible materials and can be folded or tightened;
wherein, when the frame part (2) is unfolded, the cone section (a) is formed by the part between the bending section (211) and the fixing end (31) and the tightened auxiliary part (23), and the cylinder section (b) is formed by the bending section (211) and the tightened auxiliary part (23).
6. The expanding device for manufacturing the PVC-O pipes as claimed in claim 5, wherein the pull rod (1) is provided with a first fluid channel (11) extending axially in the center, the center of each bracket (21) is provided with a second fluid channel (212) extending axially, and one side of each bracket (21) departing from the axis of the frame body part (2) is provided with a plurality of openings (213) for flowing out of the fluid;
wherein each of said second fluid passages (212) is in communication with said first fluid passage (11).
7. An expanding device for manufacturing PVC-O pipes according to any of the claims 3-6, characterized in that when the frame part (2) is collapsed, the maximum outer diameter of the frame part (2) is smaller than the inner diameter of the pre-processed billet.
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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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| CN201910918223.9A CN110815802B (en) | 2019-09-26 | 2019-09-26 | Method for manufacturing PVC-O pipe and expansion device thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112186466A (en) * | 2020-09-28 | 2021-01-05 | 刘小松 | A insulating cover expanding unit for battery terminal protection |
| CN113021855A (en) * | 2021-03-04 | 2021-06-25 | 台州学院 | Biaxial stretching equipment for pipe processing and stretching method thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112186466A (en) * | 2020-09-28 | 2021-01-05 | 刘小松 | A insulating cover expanding unit for battery terminal protection |
| 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 |
| CN113021855A (en) * | 2021-03-04 | 2021-06-25 | 台州学院 | Biaxial stretching equipment for pipe processing and stretching method thereof |
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|---|---|
| CN110815802B (en) | 2024-05-24 |
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