CN111535913A - Novel vehicle corrugated pipe and manufacturing process thereof - Google Patents
Novel vehicle corrugated pipe and manufacturing process thereof Download PDFInfo
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- CN111535913A CN111535913A CN202010511031.9A CN202010511031A CN111535913A CN 111535913 A CN111535913 A CN 111535913A CN 202010511031 A CN202010511031 A CN 202010511031A CN 111535913 A CN111535913 A CN 111535913A
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- corrugated pipe
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- metal
- pipe body
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 14
- 239000002184 metal Substances 0.000 claims abstract description 84
- 238000004804 winding Methods 0.000 claims abstract description 24
- 238000000034 method Methods 0.000 claims abstract description 11
- 230000008569 process Effects 0.000 claims abstract description 9
- 229910000831 Steel Inorganic materials 0.000 claims description 7
- 238000005452 bending Methods 0.000 claims description 7
- 239000010959 steel Substances 0.000 claims description 7
- 230000007704 transition Effects 0.000 claims description 4
- 238000003466 welding Methods 0.000 claims description 4
- 241000251468 Actinopterygii Species 0.000 claims description 3
- 239000011265 semifinished product Substances 0.000 claims description 3
- 238000005520 cutting process Methods 0.000 claims description 2
- 230000002035 prolonged effect Effects 0.000 abstract description 6
- 230000007797 corrosion Effects 0.000 abstract description 4
- 238000005260 corrosion Methods 0.000 abstract description 4
- 238000009434 installation Methods 0.000 abstract description 4
- 239000003973 paint Substances 0.000 abstract description 4
- 238000005507 spraying Methods 0.000 abstract description 4
- 238000004321 preservation Methods 0.000 abstract description 3
- 229910000975 Carbon steel Inorganic materials 0.000 abstract description 2
- 239000010962 carbon steel Substances 0.000 abstract description 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 abstract description 2
- 239000004922 lacquer Substances 0.000 abstract description 2
- 150000003839 salts Chemical class 0.000 abstract description 2
- 238000007789 sealing Methods 0.000 abstract description 2
- 239000007921 spray Substances 0.000 abstract description 2
- 239000000047 product Substances 0.000 description 8
- 239000000463 material Substances 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000003584 silencer Effects 0.000 description 2
- 239000010963 304 stainless steel Substances 0.000 description 1
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 229910000589 SAE 304 stainless steel Inorganic materials 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
- F01N13/08—Other arrangements or adaptations of exhaust conduits
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
- F01N13/16—Selection of particular materials
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
- F01N13/18—Construction facilitating manufacture, assembly, or disassembly
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
- F01N13/18—Construction facilitating manufacture, assembly, or disassembly
- F01N13/1805—Fixing exhaust manifolds, exhaust pipes or pipe sections to each other, to engine or to vehicle body
- F01N13/1811—Fixing exhaust manifolds, exhaust pipes or pipe sections to each other, to engine or to vehicle body with means permitting relative movement, e.g. compensation of thermal expansion or vibration
- F01N13/1816—Fixing exhaust manifolds, exhaust pipes or pipe sections to each other, to engine or to vehicle body with means permitting relative movement, e.g. compensation of thermal expansion or vibration the pipe sections being joined together by flexible tubular elements only, e.g. using bellows or strip-wound pipes
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust Silencers (AREA)
Abstract
The invention relates to a novel vehicle corrugated pipe and a manufacturing process thereof. The novel corrugated pipe for the vehicle has the advantages of high flexibility, heat preservation, corrosion resistance, good sealing property and long service life; the main corrugated pipe and the winding pipe have good high temperature resistance and corrosion resistance; the fish-line net, the Z-shaped outer ring and the joint break through the process scheme that the joint of the corrugated pipe carbon steel part for the traditional commercial vehicle needs paint spraying, the working procedures of joint phosphorization, paint spraying, salt spray test and the like are omitted, and the production and manufacturing cost is reduced; the problem of the user lead to connecting rust because of falling the lacquer in the use, influence appearance quality is solved. The metal corrugated pipe, the fish-grain net and the metal winding pipe adopt a special assembly process, so that a certain expansion allowance of a product is ensured, the installation state of the product is controlled, the product is effectively prevented from being broken due to excessive deformation, and the service life of the product is prolonged.
Description
The technical field is as follows:
the invention relates to a novel vehicle corrugated pipe and a manufacturing process thereof, and belongs to the technical field of flexible connection of commercial vehicle exhaust systems.
Background art:
with the gradual improvement of the automobile emission standard, higher technical requirements are put forward on the application of the exhaust metal hose in an automobile exhaust system: the engine vibration-free exhaust system has the advantages that damage to the whole exhaust system caused by engine vibration is effectively reduced, system arrangement is optimized, the service life of the system is prolonged, functions of heat preservation, high flexibility and the like are required, and at the present stage, manufacturers at home and abroad adopt structures such as 'U-shaped' corrugated pipes, spiral pipes, 'ASS' and 'Triple S' winding pipes, and the like, so that the requirements of new standards cannot be completely met.
The invention content is as follows:
the invention provides a novel vehicle corrugated pipe and a manufacturing process thereof, and the novel vehicle corrugated pipe is used on a commercial vehicle, can effectively compensate tolerance of installation and connection sizes, can effectively absorb axial, radial and alternating vibration at high temperature, and prolongs the service life of an exhaust system.
The invention is realized by the following technical scheme: the utility model provides a novel automobile-used bellows, has the metal bellows body of straight limit section including both ends, metal bellows body inner wall has inlayed the metal winding pipe, and this external even parcel of metal bellows has the fish line net.
The metal corrugated pipe and the metal winding pipe form a hollow heat-insulating layer, so that heat energy conduction of the whole pipe body is reduced. The metal winding pipe is effectively controlled in installation state through a special production process, a certain expansion allowance of the novel vehicle corrugated pipe is guaranteed, and the metal winding pipe is prevented from being broken due to severe vibration in the vehicle movement process. The corrugated pipe is externally covered with the metal fish-line net, so that the corrugated pipe has better flexibility and displacement compensation, can prevent the corrugated pipe from being excessively stretched, plays a role in limiting, has a certain protection effect on the collision of the pipe body, and effectively improves the service life of the pipe body.
Through statistics and analysis of past exhaust bellows fracture parts: about 95% of the product fracture occurs at the first wave or the second wave, and we analyze the phenomenon of the exhaust bellows, and it can be known that the bellows at one end close to the vibration source engine has the first, second waves with vibration and expansion sizes obviously larger than those of the middle part, so that the first and second waves are easy to fracture.
How to solve the problem of this fracture? The corrugated pipe has the advantages that under the condition that the waveform parameters such as the inner diameter, the wave distance, the wave number and the wall thickness are the same, the smaller the wave height is, the larger the rigidity strength is; meanwhile, the smaller the wave height, the smaller the material extension, the thicker the wall thickness of the small wave is, and the smaller the wave height is, the thicker the wall thickness of the large wave is, so that the small wave is not easy to break. It can be seen that the size of the waveform affects the fatigue life of the product.
The corrugated pipe adopts a high-low wave transition design, the size proportion of negative waves and positive waves of a pipe body is optimized, the size of the positive waves in the original design is close to 2 times that of the negative waves, the sizes of the negative waves and the positive waves are close, and the design purpose of increasing wave troughs is achieved. Through the design modification of the two points, the local stress can be dispersed and concentrated, the conditions that the corrugated pipe is first in the use process and two waves are broken due to overlarge stress are reduced, and the purpose that the service life of the corrugated pipe product is greatly prolonged in the use process is achieved.
In order to solve the problem that the rigidity of the U-shaped corrugated pipe is too high to cause the exhaust manifold connected with the U-shaped corrugated pipe to be broken in batch, in order to increase the flexibility of the corrugated pipe, the service life of the corrugated pipe is further prolonged. Under the condition of a certain wave height, the flexibility of the corrugated pipe can be increased by reducing the wall thickness and increasing the wave number of the pipe body.
Therefore, preferably, the metal corrugated pipe body is sleeved by 1-3 layers of thin-walled pipes, the outer walls of two ends of the metal corrugated pipe body are provided with a plurality of U-shaped stepped waveforms, the internal wall negative wave of the middle part of the metal corrugated pipe body is provided with a plurality of U-shaped waveforms, and the external wall positive wave is provided with a plurality of double-U-shaped superposed waveforms. The thickness of each layer of the wall of the thin-walled tube of the metal corrugated tube body is 0.15mm-0.5mm, and 1-3 layers are freely sleeved and formed.
The outer walls of two ends of the metal corrugated pipe body are respectively provided with 2-4U-shaped step waveforms, the wave height of the primary wave at the end part is 1mm-5mm lower than that of the second wave, the wave height of the second wave is 1mm-5mm lower than that of the third wave, and so on. The bending radius of the negative waves on the inner wall of the metal corrugated pipe body is 2-6 times of the total wall thickness of the metal corrugated pipe body.
The fish-grain net is soft steel wires, each strand of the fish-grain net comprises 1-3 steel wires, the diameter of each steel wire is less than or equal to 0.3mm, the holes are in a fish-net shape, and the fish-grain net has better flexibility and compensation compared with a conventional metal steel wire woven net sleeve.
The straight flange section department that the line net of fish, metal winding pipe both ends are fixed in the corrugated metal pipe body through the outer loop, the outer loop cross-section is the Z type, prevents that corrugated metal pipe height ripples from producing inefficacy because of the collision, and the welding of the straight flange section excircle of corrugated metal pipe body has metal flange and joint.
As a preferable scheme of the invention, the outer walls of the two ends of the metal corrugated pipe body are respectively provided with 2-4U-shaped step waveforms, and the rigidity of the end parts of the two ends of the metal corrugated pipe body can be increased by a plurality of U-shaped step waveforms, so that the breakage rate of the corrugated pipe can be effectively reduced. The middle part inner wall negative wave is U type ripples, and the outer wall positive wave is two U type stack waveforms and includes integrated into one piece's U type bottom waveform and the most advanced waveform of U type, according to the relation of material bend radius and wall thickness: the bending radius of the U-shaped tip waveform is 0.4-3 times of the total wall thickness of the metal corrugated pipe body, the waveform height accounts for 0.3-0.5 times of the total height of the double-U-shaped superposed waveform, the U-shaped tip waveform is connected with the U-shaped bottom waveform through circular arc transition, the thickness of the U-shaped bottom waveform is 1.5-3 times of the thickness of the U-shaped tip waveform, the waveform height accounts for 0.5-0.7 times of the total height of the double-U-shaped superposed waveform, and the wave crest of the double-U-shaped superposed waveform is a U-shaped wave with a smaller bending radius, so that the damage of a sharp-angle flat structure formed at the wave crest position to plastic deformation of a material is eliminated, the service life of a product is prolonged, and the displacement compensation performance is good.
Preferably, the rigidity of the metal corrugated pipe body is less than or equal to 10N/mm.
The invention also provides a manufacturing process of the novel vehicle corrugated pipe, which comprises the following steps:
(1) uniformly covering a metal knitted fish-grain net outside the U-shaped stepped waveform and the double-U-shaped superposed waveform;
(2) fixing a fish-line net by using an outer ring, wherein the metal winding pipe is positioned in the inner circles of the straight edge sections at the two ends of the metal corrugated pipe body;
(3) cutting the metal winding pipe to the required assembly size in a completely compressed state, and sleeving the metal winding pipe into the inner wall of the metal corrugated pipe body;
(4) and (5) after the semi-finished product is molded to the required size, welding a joint to finish the manufacture.
The invention has the following advantages: the novel vehicle corrugated pipe has the advantages of high flexibility, heat preservation, corrosion resistance, good sealing property and long service life; the main corrugated pipe and the winding pipe are both made of 321 stainless steel, and have good high temperature resistance and corrosion resistance; the fish-line net, the Z-shaped outer ring and the joint are all made of 304 stainless steel, so that the process scheme that the traditional corrugated pipe carbon steel joint for the commercial vehicle needs paint spraying is broken, the procedures of joint phosphating, paint spraying, salt spray test and the like are omitted, and the production and manufacturing cost is reduced; the problem of the user lead to connecting rust because of falling the lacquer in the use, influence appearance quality is solved. The metal corrugated pipe, the fish-grain net and the metal winding pipe adopt a special assembly process, so that a certain expansion allowance of a product is ensured, the installation state of the product is controlled, the product is effectively prevented from being broken due to excessive deformation, and the service life of the product is prolonged.
Description of the drawings:
FIG. 1 is a schematic structural view of the novel vehicular bellows of the present invention;
fig. 2 is a schematic structural diagram of a double U-shaped superimposed waveform of the present invention.
Detailed Description
The following detailed description of the preferred embodiments of the present invention, taken in conjunction with the accompanying drawings, will make the advantages and features of the invention more readily understood by those skilled in the art, and thus will more clearly and distinctly define the scope of the invention.
As shown in fig. 1, a novel vehicle corrugated pipe comprises a metal corrugated pipe body 6 with straight edge sections at two ends, a metal winding pipe 3 is embedded in the inner wall of the metal corrugated pipe body 6, the outer walls of the two ends of the metal corrugated pipe body 6 are provided with a plurality of U-shaped step waveforms 7, the outer wall of the middle part of the metal corrugated pipe body is provided with a plurality of double-U-shaped superposed waveforms 1, a fish-grain net 2 is uniformly wrapped outside the U-shaped step waveforms 7 and the double-U-shaped superposed waveforms 1, the two ends of the fish-grain net 2 and the two ends of the metal winding pipe 3 are fixed at the straight edge sections of the metal corrugated pipe body 6 through a Z-shaped outer ring 5 with a protection function, and a joint 4 is welded at. The novel vehicle corrugated pipe is suitable for pipelines for conveying gas media between an exhaust manifold and a silencer of a commercial vehicle automobile engine and an exhaust system.
The metal corrugated pipe body 6 is sleeved by 1-3 layers of thin-walled pipes, 2-4U-shaped step waveforms are arranged on the outer walls of two ends of the metal corrugated pipe body 6, the internal wall negative wave of the middle part of the metal corrugated pipe body is a plurality of U-shaped waveforms, and the external wall positive wave is a plurality of double-U-shaped superposed waveforms. The thickness of each layer of the wall of the thin-walled tube of the metal corrugated tube body is 0.15mm-0.5mm, and 1-3 layers are freely sleeved and formed. The U-shaped step wave form of the outer wall of the two ends of the metal corrugated pipe body 6 is that the wave height of the primary wave of the end part is 1mm-5mm lower than that of the second wave, the wave height of the second wave is 1mm-5mm lower than that of the third wave, and so on. The bending radius of the negative waves on the inner wall of the metal corrugated pipe body 6 is 2-6 times of the total wall thickness of the metal corrugated pipe body 6.
The specific assembly process of the invention is as follows:
(1) uniformly covering a metal knitted fish-line net 2 outside the U-shaped step waveform 7 and the double-U-shaped superposed waveform 1;
(2) fixing the fishline net 2 by using a Z-shaped outer ring 5, and positioning the metal winding pipe 3 in the inner circles of straight edge sections at two ends of the metal corrugated pipe body 6;
(3) shearing the metal winding pipe 3 to the required assembly size in a completely compressed state, and sleeving the metal winding pipe 3 into the inner wall of the metal corrugated pipe body 6 in a semi-stretched state;
(4) and (4) after the semi-finished product is calibrated to the required size, welding the joint 4, and ensuring the total length of the device after the joint 4 is welded.
And a metal flange 4 is welded on the excircle of the Z-shaped outer ring 5, and the Z-shaped outer ring 5, the metal corrugated pipe 6, the metal fish-grain net 2, the metal winding pipe 3 and the joint 4 are welded integrally at 5 positions. When the device is installed, the device and the exhaust manifold can be directly and rapidly connected with the silencer through the joint 4.
The double U-shaped superimposed waveform shown in fig. 2 includes a U-shaped bottom waveform 11 and a U-shaped tip waveform 12 which are integrally formed. The bending radius of the U-shaped tip waveform 12 is 0.4-3 times of the total wall thickness of the metal corrugated pipe body, the waveform height accounts for 0.3-0.5 times of the total height of the double U-shaped superposed waveform, the U-shaped tip waveform 12 is in transition connection with the U-shaped bottom waveform 11 through an arc, the thickness of the U-shaped bottom waveform 11 is 1.5-3 times of the thickness of the U-shaped tip waveform 12, the waveform height accounts for 0.5-0.7 times of the total height of the double U-shaped superposed waveform,
finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the embodiments of the present invention, and they should be construed as being included therein. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. The utility model provides a novel automobile-used bellows, has the metal bellows body of straight limit section including both ends, its characterized in that: the metal corrugated pipe body has the metal winding pipe inlayed to the inner wall, and this external even parcel of metal corrugated pipe has the fish line net.
2. The novel vehicle bellows according to claim 1, wherein: the metal corrugated pipe body is sleeved by 1-3 layers of thin-walled pipes, the outer walls of two ends of the metal corrugated pipe body are provided with a plurality of U-shaped stepped waveforms, the internal wall negative wave of the middle part of the metal corrugated pipe body is provided with a plurality of U-shaped waveforms, and the external wall positive wave is provided with a plurality of double-U-shaped superposed waveforms.
3. The novel vehicle bellows according to claim 2, characterized in that: the thickness of each layer of the wall of the thin-walled tube of the metal corrugated tube body is 0.15mm-0.5mm, and 1-3 layers of the thin-walled tube are freely sleeved and formed.
4. The novel vehicle bellows according to claim 2, characterized in that: the outer walls of two ends of the metal corrugated pipe body are respectively provided with 2-4U-shaped step waveforms, the wave height of the primary wave at the end part is 1-5 mm lower than that of the second wave, the wave height of the second wave is 1-5 mm lower than that of the third wave, and so on.
5. The novel vehicle bellows according to claim 2, characterized in that: the bending radius of the negative waves on the inner wall of the metal corrugated pipe body is 2-6 times of the total wall thickness of the metal corrugated pipe body.
6. The novel vehicle bellows according to claim 2, characterized in that: the metal corrugated pipe body outer wall positive wave comprises a U-shaped bottom wave and a U-shaped tip wave which are integrally formed, the bending radius of the U-shaped tip wave is 0.4-3 times of the total wall thickness of the metal corrugated pipe body, the wave height of the U-shaped tip wave accounts for 0.3-0.5 times of the total height of the double-U-shaped superposed wave, the U-shaped tip wave is connected with the U-shaped bottom wave through an arc in a transition mode, the thickness of the U-shaped bottom wave is 1.5-3 times of the thickness of the U-shaped tip wave, and the wave height of the U-shaped tip wave accounts for 0.5-0.7 times of the total height of the double-U-shaped superposed.
7. The novel vehicle bellows according to claim 1, wherein: the rigidity of the metal corrugated pipe body is less than or equal to 10N/mm.
8. The novel vehicle bellows according to claim 1, wherein: the fish-grain net is soft steel wires, each strand of the fish-grain net comprises 1-3 steel wires, the diameter of each steel wire is less than or equal to 0.3mm, and the holes are net-shaped.
9. The novel vehicle bellows according to claim 1, wherein: the fish-grain net and the two ends of the metal winding pipe are fixed at the straight edge sections of the metal corrugated pipe body through outer rings, and the cross section of each outer ring is Z-shaped.
10. A process for manufacturing a novel vehicle corrugated pipe according to any one of claims 1 to 9, comprising the following steps:
(1) uniformly covering a metal knitted fish-grain net outside the U-shaped stepped waveform and the double-U-shaped superposed waveform;
(2) fixing a fish-line net by using an outer ring, wherein the metal winding pipe is positioned in the inner circles of the straight edge sections at the two ends of the metal corrugated pipe body;
(3) cutting the metal winding pipe to the required assembly size in a completely compressed state, and sleeving the metal winding pipe into the inner wall of the metal corrugated pipe body;
(4) and (5) after the semi-finished product is molded to the required size, welding a joint to finish the manufacture.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010511031.9A CN111535913A (en) | 2020-06-08 | 2020-06-08 | Novel vehicle corrugated pipe and manufacturing process thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010511031.9A CN111535913A (en) | 2020-06-08 | 2020-06-08 | Novel vehicle corrugated pipe and manufacturing process thereof |
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| Publication Number | Publication Date |
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| CN111535913A true CN111535913A (en) | 2020-08-14 |
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| CN202010511031.9A Pending CN111535913A (en) | 2020-06-08 | 2020-06-08 | Novel vehicle corrugated pipe and manufacturing process thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112879686A (en) * | 2021-01-08 | 2021-06-01 | 浙江金腾管业科技有限公司 | High-strength durable double-wall corrugated pipe and processing technology thereof |
| CN113145954A (en) * | 2021-03-30 | 2021-07-23 | 广西天正钢结构有限公司 | Bridge welding device and bridge welding method |
| CN113833551A (en) * | 2021-09-23 | 2021-12-24 | 航天晨光股份有限公司 | Corrugated pipe for national VI commercial vehicle |
| CN117905564A (en) * | 2024-03-15 | 2024-04-19 | 常州市常联波纹管有限公司 | Novel vehicular corrugated pipe and manufacturing process thereof |
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| CN113145954A (en) * | 2021-03-30 | 2021-07-23 | 广西天正钢结构有限公司 | Bridge welding device and bridge welding method |
| CN113833551A (en) * | 2021-09-23 | 2021-12-24 | 航天晨光股份有限公司 | Corrugated pipe for national VI commercial vehicle |
| CN117905564A (en) * | 2024-03-15 | 2024-04-19 | 常州市常联波纹管有限公司 | Novel vehicular corrugated pipe and manufacturing process thereof |
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