CN105984158A - Forming method and device for spiral corrugated pipe - Google Patents
Forming method and device for spiral corrugated pipe Download PDFInfo
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- CN105984158A CN105984158A CN201510057094.0A CN201510057094A CN105984158A CN 105984158 A CN105984158 A CN 105984158A CN 201510057094 A CN201510057094 A CN 201510057094A CN 105984158 A CN105984158 A CN 105984158A
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- plastics
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- Shaping Of Tube Ends By Bending Or Straightening (AREA)
Abstract
The invention discloses a forming method of a spiral corrugated pipe, and a forming device of the spiral corrugated pipe. The forming method includes the steps that extruded plastic inner pieces (2) are connected with the inner wall of a spiral metal section bar (1) in a spiral manner, extruded plastic outer pieces (3) are connected with the outer wall of the spiral metal section bar (1) in a spiral manner, and therefore the structure of multiple rings of corrugated pipe coils is formed. The adjacent corrugated pipe coils are connected by connecting the corresponding plastic inner pieces (2) of the corrugated pipe coils with each other. In the process during which the plastic inner pieces (2) are just extruded and spirally rotate by a circle, the plastic inner pieces (2) are connected with the metal section bar (1). By means of the forming method of the spiral corrugated pipe, the overall quality of the spiral corrugated pipe can be improved.
Description
Technical field
The present invention relates to forming method and the shaped device of a kind of helical bellows of a kind of helical bellows.
Background technology
Helical bellows (as depicted in figs. 1 and 2) generally includes spirality metal section bar 1 and metal
Plastics internal sheet 2 that the inwall of section bar 1 engages and the plastics outer plate 3 engaged with the outer wall of shape 1,
By the plastics internal sheet 2 that internal sheet extrusion moulding apparatus and outer plate extrusion moulding apparatus are extruded respectively and plastics outer plate 3
Engaging in a helical pattern with inwall and the outer wall of shape 1 respectively, helical bellows is formed as many
The structure of circle ripple pipeloop, wherein, each ripple pipeloop all includes plastics inner plate ring 4, shape circle
5 (shape circle 5 includes that two for the junction surface 7 engaged with plastics internal sheet 2 and are positioned at two
Lobe 8 between junction surface 7) and plastics outer plate circle (not showing in Fig. 2), adjacent ripple pipeloop
Connect by adjacent plastics inner plate ring 4 is engaged with each other.Such helical bellows owing to it is lightweight,
The advantages such as intensity is high, ageing-resistant, and be widely used in the various scenes of social production life, such as
Drain pipe pipeline in city and the drain pipe pipeline in community.
The shaped device of typical helical bellows is the patent application of CN203901744U at notification number
Middle announcement, meanwhile, Fig. 3 shows the part-structure of the shaped device of existing helical bellows, wherein
This shaped device includes internal sheet extrusion moulding apparatus 10a, outer plate extrusion moulding apparatus 10b, active roll tube 18, pressure roller
Mechanism 15 etc..In existing helical bellows forming process, plastics internal sheet 2 is filled by internal sheet extrusion molding
After putting 10a extrusion, the most all revolve and just engage with shape 1 after turning around, therefore, plastics internal sheet 2
The when of joint with shape 1, temperature has declined, thus it is poor to directly result in splicing results, reduces
The total quality of helical bellows.Additionally, the width of part that adjacent plastics inner plate ring 4 is engaged with each other
Wider (see Fig. 2), and this spans being engaged with each other two circle shape circles 5, thus cause
Existing helical bellows is the most heavier, and manufacturing cost is higher.
In view of this, it is desirable to provide the technical scheme of a kind of total quality that can improve helical bellows.
Summary of the invention
The technical problem to be solved is to provide the forming method of a kind of helical bellows, this spiral
The forming method of corrugated tube ensure that the bond quality of shape and plastics internal sheet, and then improves spiral
The total quality of corrugated tube.
Additionally, another technical problem to be solved of the present invention is to provide the molding of a kind of helical bellows
Device, the shaped device of this helical bellows ensure that the bond quality of shape and plastics internal sheet,
And then improve the total quality of helical bellows.
To achieve these goals, the present invention provides the forming method of a kind of helical bellows, this molding side
Method includes: by the plastics internal sheet of extrusion and plastics outer plate respectively with the inner and outer wall of spirality metal section bar
Engaging in a helical pattern, to form the structure of multi-turn ripple pipeloop, adjacent described ripple pipeloop passes through
Respective plastics internal sheet is engaged with each other and connects, and has just been extruded to spiral rotating one circle in described plastics internal sheet
During, described plastics internal sheet engages with described shape.
Preferably, each described ripple pipeloop all includes plastics inner plate ring, shape circle and plastics outer plate
Circle, adjacent described plastics inner plate ring is engaged with each other, and described shape circle includes two for described
The junction surface of chip bonding and lobe between said two junction surface in plastics.
Preferably, the width of the part that adjacent described plastics inner plate ring is engaged with each other and described junction surface
Width is corresponding, and the one in said two junction surface is engaged with each other at adjacent described plastics inner plate ring
Position engage with described plastics inner plate ring, the another one in said two junction surface and described plastics internal sheet
The mid portion of circle engages.
Preferably, the part of the described plastics inner plate ring engaged with the another one in said two junction surface sets
It is equipped with thickening layer.
Preferably, adjacent described ripple pipeloop is engaged with each other also by by adjacent described plastics outer plate circle
And connect.
Preferably, adjacent described plastics outer plate circle connects between adjacent described shape circle each other
Close.
Preferably, adjacent described plastics outer plate circle in the described junction surface of described shape circle one
The position of person is engaged with each other.
Preferably, adjacent described plastics outer plate circle is on the top of the described lobe of described shape circle
It is engaged with each other.
Preferably, the thickness of the end of described plastics inner plate ring both sides tapers into, and the end of this end
Be formed as fillet.
Preferably, described junction surface is arranged at intervals with through hole along the bearing of trend of described shape circle.
Additionally, the present invention also provides for the shaped device of a kind of helical bellows, this shaped device includes:
Frame, this support is fixed on frame；Main beam, one end of this main beam is installed on the side of described support,
It is provided with end plate on the other end of described main beam；Active roll tube, one end of this active roll tube is pivotally connected
In described support, the other end of described active roll tube is pivotally connected to described end plate；Drive system, this drives
Dynamic system is in transmission connection with described active roll tube, and described shaped device also includes for extrusion plastic internal sheet
Internal sheet extrusion moulding apparatus, this internal sheet extrusion moulding apparatus is arranged at so that described plastics internal sheet is extruded to spiral just
The position that rotation engages with described shape during turning around.
Preferably, described shape circle include two for the junction surface of chip bonding in described plastics with
And the lobe between said two junction surface, described shaped device also includes for making plastics outer plate
Being close to the press-roller device of shape, described press-roller device includes that pressing roll mechanism, described pressing roll mechanism include
Roll shaft and multiple interval are installed on the roller on described roll shaft, and the two in the plurality of roller compresses respectively
In with two junction surfaces in chip bonding in plastics.
Preferably, described shape circle include two for the junction surface of chip bonding in described plastics with
And the lobe between said two junction surface, described shaped device also includes for making plastics outer plate
Being close to the compound pinch roller of shape and for the shape guider of spacing shape, this is multiple
Two nip portion of combined pressure wheel are pressed in and two junction surfaces in chip bonding in plastics respectively.
The forming method of the helical bellows of the present invention is extruded to spiral by making plastics internal sheet just
Rotation engages with shape during turning around, thus in helical bellows forming process, metal mold
Material can rapidly with chip bonding (during joint, temperature is higher) in the plastics of the molten condition just extruded, from
And ensure the bond quality of shape and plastics internal sheet, and then improve the total quality of helical bellows.
Additionally, the shaped device of the helical bellows of the present invention has above advantage equally.
Other features and advantages of the present invention will be described in detail in detailed description of the invention part subsequently.
Accompanying drawing explanation
Accompanying drawing is used to provide a further understanding of the present invention, and constitutes the part of description, with
Detailed description below is used for explaining the present invention together, but is not intended that limitation of the present invention.?
In accompanying drawing:
Fig. 1 is the structural representation of the helical bellows of prior art；
Fig. 2 is the concrete structure schematic diagram of the helical bellows in Fig. 1；
Fig. 3 is the shaped device of the helical bellows of prior art；
Fig. 4 is the knot of the shaped device of the helical bellows of the first detailed description of the invention according to the present invention
Structure schematic diagram；
Fig. 5 is the partial enlarged drawing of the shaped device in Fig. 4；
Fig. 6 is the right view of the shaped device in Fig. 4；
Fig. 7 is the right side of the shaped device of the helical bellows of the second detailed description of the invention according to the present invention
View；
Fig. 8 be the shaped device of the helical bellows in Fig. 7 along A to schematic diagram；
Fig. 9 is the structural representation of the shape guider in Fig. 8；
Figure 10 is the structural representation of the helical bellows of the first detailed description of the invention according to the present invention；
Figure 11 is the structural representation of the helical bellows of the second detailed description of the invention according to the present invention；
Figure 12 is the structural representation of the helical bellows of the third detailed description of the invention according to the present invention；
Figure 13 is the structural representation of the helical bellows of the 4th kind of detailed description of the invention according to the present invention；
Figure 14 is the structural representation of the helical bellows of the 5th kind of detailed description of the invention according to the present invention；
Figure 15 is the structural representation of the another embodiment of the shape circle in Figure 10.
Description of reference numerals
1, shape 2, plastics internal sheet
3, plastics outer plate 4, plastics inner plate ring
5, shape circle 6, plastics outer plate circle
7, junction surface 8, lobe
9, thickening layer 10a, internal sheet extrusion moulding apparatus
10b, outer plate extrusion moulding apparatus 11, support
12, main beam 13, end plate
14, drive system 15, pressing roll mechanism
15a, roll shaft 15b, roller
16, compound pinch roller 17, shape guider
18, active roll tube 19, cylinder
20, slide block 21, fixed block
Detailed description of the invention
Below in conjunction with accompanying drawing, the detailed description of the invention of the present invention is described in detail.It should be appreciated that
Detailed description of the invention described herein is merely to illustrate and explains the present invention, is not limited to this
Bright.
The present invention provides the forming method of a kind of helical bellows, if Fig. 4 is to shown in 15, and this molding side
Method includes: by the plastics internal sheet 2 of extrusion and plastics outer plate 3 respectively with the inwall of spirality metal section bar 1
Engage in a helical pattern with outer wall, to form the structure of multi-turn ripple pipeloop, adjacent described corrugated tube
Circle is engaged with each other by respective plastics internal sheet 2 and connects, and has just been extruded to spiral shell in described plastics internal sheet 2
During rotation rotation is turned around, described plastics internal sheet 2 engages with described shape 1.
The forming method of the helical bellows of the present invention is extruded to spiral by making plastics internal sheet 2 just
Rotation engages with shape 1 during turning around, thus in helical bellows forming process, metal
Section bar 1 can engage with the plastics internal sheet 2 of the molten condition just extruded rapidly that (during joint, temperature is relatively
High), thus ensure the bond quality of shape 1 and plastics internal sheet 2, and then improve helical bellows
Total quality.
In the forming method of the helical bellows of the present invention, it is preferable that each described ripple pipeloop all wraps
Include plastics inner plate ring 4, shape circle 5 and plastics outer plate circle 6 (as shown in figures 10-14), adjacent
Described plastics inner plate ring 4 is engaged with each other, described shape circle 5 include two for in described plastics
The junction surface 7 that sheet 2 engages and the lobe 8 between said two junction surface 7, thus pass through
Adjacent plastics inner plate ring 4 is engaged with each other and realizes the connection between adjacent described ripple pipeloop.
In the forming method of the helical bellows of the present invention, the most as shown in Figure 10, adjacent
The width (about 3～35mm) of the part that described plastics inner plate ring 4 is engaged with each other and described junction surface 7
Width corresponding, and the one in said two junction surface 7 adjacent described plastics inner plate ring 4 that
This position engaged engages with described plastics inner plate ring 4, the another one in said two junction surface 7 and institute
The mid portion stating plastics inner plate ring 4 engages, thus is greatly reduced what plastics inner plate ring 4 was engaged with each other
The width (reducing more than 60%) of part, and then alleviate the quality of helical bellows.It addition, such as Figure 11
Shown in, the distance between described one junction surface 7 and the end of plastics inner plate ring 4 is 5～30mm, with
The part of the described plastics inner plate ring 4 that the another one in said two junction surface 7 engages is provided with thickening layer
9, thus improve the quality that plastics internal sheet 2 engages with shape 1, increase the entirety of helical bellows
Intensity.
In the forming method of the helical bellows of the present invention, it is further preferred that as shown in figs. 12-14,
Adjacent described ripple pipeloop connects also by being engaged with each other by adjacent described plastics outer plate circle 6, from
And increase the bulk strength of helical bellows further.Specifically, for reinforced plastics outer plate circle 6 each other
The intensity of engaging zones, improves the total quality of helical bellows, and adjacent described plastics outer plate circle 6 exists
It is engaged with each other between adjacent described shape circle 5, or adjacent described plastics outer plate circle 6 is in institute
The position stating the one in the described junction surface 7 of shape circle 5 is engaged with each other to save plastic sheet
Material, the most adjacent described plastics outer plate circle 6 is in the described lobe 8 of described shape circle 5
Top be engaged with each other to provide extra protection to lobe 8.
In the forming method of the helical bellows of the present invention, specifically, described plastics inner plate ring 4 both sides
The thickness of end taper into, and the end of this end is formed as fillet (as shown in figure 11), in order to
Reduce plastics inner plate ring 4 be bonded to each other part stress.More specifically, described junction surface 7 is along described gold
The bearing of trend of genotype material circle 5 is arranged at intervals with through hole (as shown in figure 15), wherein, between through hole
Spacing is 10～60mm so that plastics inner plate ring 4 and plastics outer plate circle 6 directly in conjunction with, improve
The total quality of helical bellows.
Additionally, the present invention also provides for the shaped device (as shown in Figure 4) of a kind of helical bellows, this one-tenth
Type device includes: support 11, and this support 11 is fixed on frame 9；Main beam 12, this main beam 12
One end be installed on the side of described support 11, the other end of described main beam 12 is provided with end plate 13；
Active roll tube 18, one end of this active roll tube 18 is pivotally connected to described support 11, described active roll tube
The other end of 18 is pivotally connected to described end plate 13；Drive system 14, this drive system 14 and described master
Action roller cylinder 18 is in transmission connection, and described shaped device also includes the internal sheet extrusion molding for extrusion plastic internal sheet 2
Device 10a, this internal sheet extrusion moulding apparatus 10a are arranged at so that described plastics internal sheet 2 is extruded to spiral shell just
The position that rotation rotation engages with described shape 1 during turning around.
The shaped device of the helical bellows of the present invention is by being arranged at internal sheet extrusion moulding apparatus 10a so that institute
State what plastics internal sheet 2 engaged with described shape 1 during being just extruded to spiral rotating one circle
Position, thus in helical bellows forming process, shape 1 can be molten with just extrude rapidly
The plastics internal sheet 2 melting state engages (during joint, temperature is higher), thus ensures shape 1 and plastics
The bond quality of internal sheet 2, and then improve the total quality of helical bellows.
In the shaped device of the helical bellows of the present invention, specifically, as it can be seen in figures 5 and 6, described
Shape circle 5 includes that two for the junction surface 7 engaged with described plastics internal sheet 2 and are positioned at described
Lobe 8 between two junction surfaces 7, described shaped device also includes for making plastics outer plate 3 be close to
The press-roller device of shape 1, described press-roller device includes pressing roll mechanism 15, described pressing roll mechanism 15
It is installed on the roller 15b on described roll shaft 15a, the plurality of roller including roll shaft 15a and multiple interval
The two two junction surface 7 being pressed in respectively in engaging with plastics internal sheet 2 in 15b, thus utilize and be somebody's turn to do
Press-roller device compresses plastics outer plate 3 respectively so that plastics outer plate 3 and shape 1 and plastics internal sheet
2 engage with shape 1.
Optionally, such as Fig. 7, shown in 8 and 9, described shape circle 5 include two for institute
State the junction surface 7 of plastics internal sheet 2 joint and the lobe 8 between said two junction surface 7,
Described shaped device also include for make plastics outer plate 3 be close to shape 1 compound pinch roller 16 and
For the shape guider 17 of spacing shape 1, two nip portion of this compound pinch roller 16
Two junction surfaces 7 being pressed in respectively in engaging with plastics internal sheet 2, thus utilize this compound pinch roller 16,
Plastics outer plate 3 is engaged with shape 1 with shape 1 and plastics internal sheet 2.
In the shaped device of above-mentioned helical bellows, specifically, as it is shown in figure 9, described shape
Guider 17 includes that guidance set and one end are fixed the other end and connected the cylinder of described guidance set
19, described guidance set includes slide block 20 and fixed block 21, and wherein, described slide block 20 is fixing with described
The corresponding gap of shape of lobe 8 with shape 1 it is formed between block 21.
The preferred embodiment of the present invention is described in detail above in association with accompanying drawing, but, the present invention does not limit
Detail in above-mentioned embodiment, in the technology concept of the present invention, can be to the present invention
Technical scheme carry out multiple simple variant, these simple variant belong to protection scope of the present invention.
It is further to note that each the concrete technology described in above-mentioned detailed description of the invention is special
Levy, in the case of reconcilable, can be combined by any suitable means, in order to avoid need not
The repetition wanted, various possible compound modes are illustrated by the present invention the most separately.
Additionally, combination in any can also be carried out between the various different embodiment of the present invention, as long as its
Without prejudice to the thought of the present invention, it should be considered as content disclosed in this invention equally.
Claims (13)
1. a forming method for helical bellows, this forming method includes: by the plastics internal sheet of extrusion
(2) and plastics outer plate (3) respectively with the inner and outer wall of spirality metal section bar (1) with spiral
Mode engages, and to form the structure of multi-turn ripple pipeloop, adjacent described ripple pipeloop is moulded by respective
Material internal sheet (2) is engaged with each other and connects, it is characterised in that be just extruded described plastics internal sheet (2)
During enclosing to spiral rotating one, described plastics internal sheet (2) engages with described shape (1).
2. according to the forming method of the helical bellows described in claim 1, it is characterised in that each
Individual described ripple pipeloop all includes plastics inner plate ring (4), shape circle (5) and plastics outer plate circle (6),
Adjacent described plastics inner plate ring (4) is engaged with each other, described shape circle (5) include two for
The junction surface (7) that engages with described plastics internal sheet (2) and be positioned at said two junction surface (7) it
Between lobe (8).
3. according to the forming method of the helical bellows described in claim 2, it is characterised in that phase
The width of the part that adjacent described plastics inner plate ring (4) is engaged with each other and the width at described junction surface (7)
Accordingly, the one and in said two junction surface (7) adjacent described plastics inner plate ring (4) that
This position engaged engages with described plastics inner plate ring (4), another in said two junction surface (7)
Person engages with the mid portion of described plastics inner plate ring (4).
4. according to the forming method of the helical bellows described in claim 3, it is characterised in that with
The part of the described plastics inner plate ring (4) that the another one in said two junction surface (7) engages is provided with
Thickening layer (9).
5. according to the forming method of the helical bellows described in claim 2, it is characterised in that phase
Adjacent described ripple pipeloop is engaged with each other also by by adjacent described plastics outer plate circle (6) and connects.
6. according to the forming method of the helical bellows described in claim 5, it is characterised in that phase
Adjacent described plastics outer plate circle (6) are engaged with each other between adjacent described shape circle (5).
7. according to the forming method of the helical bellows described in claim 5, it is characterised in that phase
Adjacent described plastics outer plate circle (6) are in the described junction surface (7) of described shape circle (5)
The position of one is engaged with each other.
8. according to the forming method of the helical bellows described in claim 5, it is characterised in that phase
Adjacent described plastics outer plate circle (6) are on the top of the described lobe (8) of described shape circle (5)
End is engaged with each other.
9. according to the forming method of the helical bellows described in claim 2, it is characterised in that institute
The thickness of the end stating plastics inner plate ring (4) both sides tapers into, and the end of this end is formed as round
Angle.
10. according to the forming method of the helical bellows described in claim 2, it is characterised in that institute
State junction surface (7) and be arranged at intervals with through hole along the bearing of trend of described shape circle (5).
The shaped device of 11. 1 kinds of helical bellowses, it is characterised in that this shaped device includes:
Support (11), this support (11) is fixed on frame (9)；
Main beam (12), one end of this main beam (12) is installed on the side of described support (11),
End plate (13) it is provided with on the other end of described main beam (12)；
Active roll tube (18), one end of this active roll tube (18) is pivotally connected to described support (11),
The other end of described active roll tube (18) is pivotally connected to described end plate (13)；
Drive system (14), this drive system (14) is in transmission connection with described active roll tube (18),
Described shaped device also includes the internal sheet extrusion moulding apparatus (10a) for extrusion plastic internal sheet (2),
This internal sheet extrusion moulding apparatus (10a) is arranged at so that described plastics internal sheet (2) is being extruded to spiral rotating
The position engaged with described shape (1) during one circle.
12. according to the shaped device described in claim 11, it is characterised in that described shape
Circle (5) includes that two for the junction surface (7) engaged with described plastics internal sheet (2) and are positioned at institute
Stating the lobe (8) between two junction surfaces (7), described shaped device also includes for making outside plastics
Sheet (3) is close to the press-roller device of shape (1), and described press-roller device includes pressing roll mechanism (15),
Described pressing roll mechanism (15) includes that roll shaft (15a) and multiple interval are installed on described roll shaft (15a)
Roller (15b), the two in the plurality of roller (15b) is pressed in and plastics internal sheet (2) respectively
Two junction surfaces (7) in joint.
13. according to the shaped device described in claim 11, it is characterised in that described shape
Circle (5) includes that two for the junction surface (7) engaged with described plastics internal sheet (2) and are positioned at institute
Stating the lobe (8) between two junction surfaces (7), described shaped device also includes for making outside plastics
Sheet (3) is close to the compound pinch roller (16) of shape (1) and for spacing shape (1)
Shape guider (17), two nip portion of this compound pinch roller (16) be pressed in respectively with
Two junction surfaces (7) in plastics internal sheet (2) joint.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510057094.0A CN105984158B (en) | 2015-02-04 | 2015-02-04 | The forming method and molding machine of helical bellows |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510057094.0A CN105984158B (en) | 2015-02-04 | 2015-02-04 | The forming method and molding machine of helical bellows |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105984158A true CN105984158A (en) | 2016-10-05 |
| CN105984158B CN105984158B (en) | 2018-12-11 |
Family
ID=57037142
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510057094.0A Active CN105984158B (en) | 2015-02-04 | 2015-02-04 | The forming method and molding machine of helical bellows |
Country Status (1)
| Country | Link |
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| CN (1) | CN105984158B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109854852A (en) * | 2018-12-26 | 2019-06-07 | 四川恒恩新材料科技有限公司 | The preparation method of the buried connector of spiral plastic corrugated pipe ultra-deep |
| CN110667092A (en) * | 2019-09-22 | 2020-01-10 | 安徽超星新材料科技有限公司 | Double-wall corrugated pipe production equipment and production method of double-wall corrugated pipe |
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| CN2627321Y (en) * | 2003-07-03 | 2004-07-21 | 蒯一希 | Plastic helical bellow |
| CN1746006A (en) * | 2005-10-09 | 2006-03-15 | 蒯一希 | Manufacture of metal reinforced plastic spiral ripple pipe |
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| CN203945703U (en) * | 2014-05-30 | 2014-11-19 | 四川金石东方新材料设备股份有限公司 | The shaped device of bellows |
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| JPS6424731A (en) * | 1987-07-21 | 1989-01-26 | Seiji Nagayoshi | Apparatus for preparing synthetic resin pipe |
| CN2627321Y (en) * | 2003-07-03 | 2004-07-21 | 蒯一希 | Plastic helical bellow |
| CN1746006A (en) * | 2005-10-09 | 2006-03-15 | 蒯一希 | Manufacture of metal reinforced plastic spiral ripple pipe |
| CN200943776Y (en) * | 2006-09-04 | 2007-09-05 | 蒯一希 | Metal reinforced screw corrugated pipe with reinforced pipe wall structure |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109854852A (en) * | 2018-12-26 | 2019-06-07 | 四川恒恩新材料科技有限公司 | The preparation method of the buried connector of spiral plastic corrugated pipe ultra-deep |
| CN110667092A (en) * | 2019-09-22 | 2020-01-10 | 安徽超星新材料科技有限公司 | Double-wall corrugated pipe production equipment and production method of double-wall corrugated pipe |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105984158B (en) | 2018-12-11 |
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