CN111842535B - Manufacturing process of aluminum alloy handrail - Google Patents
Manufacturing process of aluminum alloy handrail Download PDFInfo
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- CN111842535B CN111842535B CN202010726475.4A CN202010726475A CN111842535B CN 111842535 B CN111842535 B CN 111842535B CN 202010726475 A CN202010726475 A CN 202010726475A CN 111842535 B CN111842535 B CN 111842535B
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- aluminum alloy
- alloy handrail
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/10—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies
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Abstract
The invention discloses a manufacturing process of an aluminum alloy handrail, which comprises the following steps: preparing an aluminum alloy handrail pipe fitting I, wherein the aluminum alloy handrail pipe fitting I is formed by quenching and bending a first aluminum profile; preparing an aluminum alloy handrail pipe fitting II, wherein the aluminum alloy handrail pipe fitting II is made of a second aluminum profile through quenching and bending, after the first aluminum profile and the second aluminum profile are formed, the outer surface of the first aluminum profile and the second aluminum profile are subjected to sand blasting, a workpiece is hung on a mounting rack of a sand blasting machine, and steel shot is used for sand blasting; then the inner and outer surfaces of the first aluminum profile and the second aluminum profile are subjected to natural color anodic oxidation treatment. The aluminum alloy handrail manufactured by the manufacturing process of the aluminum alloy handrail has excellent structural performance, can meet the requirements of certain static load without generating the problems of permanent deformation, fracture and the like, fully exerts the advantages of light weight and easy forming of the aluminum alloy material, and expands the application range of the aluminum alloy material.
Description
Technical Field
The invention relates to the technical field of aluminum alloy products, in particular to a manufacturing process of an aluminum alloy handrail.
Background
The aluminum and aluminum alloy processing industry enters a brand-new high-speed development period, the application of the aluminum material is more and more extensive, and the transportation industry becomes the first major user of the aluminum material. Aluminum materials are the first choice materials for light weight, and inevitably partially replace steel and become important basic materials in all aspects of national economy departments and people's life. The urban rail train is a rapid and large-traffic rail vehicle running in the city, has excellent capability of dredging passenger flow, and the interior decoration and equipment of the vehicle are arranged according to the passenger flow. In order to improve the passenger transport capacity and adapt to the characteristics of short distance and large transport capacity of rail transit, only seats and armrests are arranged in the vehicle, so that the armrests are important built-in components in urban rail vehicles. When the vehicle is started, stopped and emergently braked normally, the handrail plays the effect of keeping the passenger stand balanced and alleviating the passenger fatigue, and the layout and the structural style are various. In the peak period of passenger flow, the quantity of passengers grabbed on the grab bar of the middle upright post is large, so that the grab bar bears large impact force. Therefore, in the structural design of the handrail, the strength and rigidity of the handrail rod are mainly considered, and the handrail rod is required to meet a certain static load without generating problems of permanent deformation, fracture and the like.
In practical application, the grab bar is mostly made of stainless steel tube, and the diameter of the grab bar is generally between 32 and 38 mm. The surface of the stainless steel pipe is subjected to wire drawing surge or sand blasting point solution polishing treatment. The aluminum alloy handrail rod is less applied in the field of urban rail vehicles in China, and the main reasons are that the mechanical property of common industrial aluminum alloy is weaker than that of stainless steel, and the surface treatment is difficult. In the existing urban rail vehicle, the aluminum alloy handrail is subjected to surface treatment by adopting anodic oxidation. But aluminum alloys have incomparable advantages over stainless steel: light weight and easy molding.
Therefore, there is a need to improve the structure and manufacturing process of the aluminum alloy handrail, so that the aluminum alloy handrail can satisfy a certain static load without generating problems of permanent deformation, fracture and the like. In addition, the existing subway handrail has single function, and cannot fully utilize the advantage of penetrating through the carriage to control the temperature in the carriage.
Disclosure of Invention
The invention aims to overcome at least one of the problems in the prior art and provides a manufacturing process of an aluminum alloy handrail.
In order to achieve the technical purpose and achieve the technical effect, the invention is realized by the following technical scheme:
an aluminum alloy handrail manufacturing process comprises the following steps:
1) preparing an aluminum alloy handrail pipe fitting I:
the aluminum alloy handrail pipe fitting I comprises a first straight pipe part and first bent pipe parts positioned on two sides of the first straight pipe part, the first straight pipe part and the first bent pipe parts on two sides are of an integral structure, the aluminum alloy handrail pipe fitting I is made of a first aluminum profile through quenching and bending, and the first aluminum profile is made of an aluminum profile extrusion forming machine through an extrusion mode; the first aluminum profile is composed of an outer tube body, a plurality of open tube parts and reinforcing rib plates, the plurality of open tube parts are uniformly arranged in the outer tube body in the circumferential direction around an axis, the open ends of two adjacent open tube parts are connected into a whole, the plurality of reinforcing rib plates are connected between the outer wall of each open tube part and the inner wall of the outer tube body, and a channel formed by the surrounding of all the open tube parts serves as a first water guide channel;
2) preparing an aluminum alloy handrail pipe fitting II:
the aluminum alloy handrail pipe fitting II comprises a second straight pipe part and second bent pipe parts positioned on two sides of the second straight pipe part, the second straight pipe part and the second bent pipe parts on two sides are of an integral structure, the aluminum alloy handrail pipe fitting II is made of a second aluminum profile through quenching and bending, and the second aluminum profile is made of an aluminum profile extrusion forming machine through an extrusion mode; a second water guide channel with a circular section is arranged in the second aluminum profile, a hose is fixedly installed at the outer end, located at the second bent pipe part, of the aluminum alloy handrail pipe fitting II, and an opening valve capable of controlling the opening and closing degree of the second water guide channel is installed in the middle, located at the second straight pipe part, of the aluminum alloy handrail pipe fitting II;
3) assembling:
the aluminum alloy handrail pipe fitting I is fixed with the aluminum alloy handrail pipe fitting II through a sealing pipe fitting joint, and the first water guide channel can be communicated with the second water guide channel through the sealing pipe fitting joint.
Further, in the manufacturing work of the aluminum alloy handrail, after the first aluminum profile and the second aluminum profile are molded, the outer surfaces of the first aluminum profile and the second aluminum profile are subjected to sand blasting treatment, the workpiece is hung on a mounting frame of a sand blasting machine, steel shot is used for sand blasting, then the hung workpiece is hung again after being inverted, sand blasting is performed again, and after the sand blasting is completed, a blower is used for blowing the inside of the through hole, so that sand grains cannot remain in the through hole; then the inner and outer surfaces are treated by natural color anodic oxidation, the workpiece is arranged on a hanging rack, then oil is removed, sodium hydroxide is used for alkali cleaning, nitric acid is used for neutralizing to remove the surface black film completely during neutralization, 50-60 ℃ water is used for soaking and water cleaning, and the workpiece is taken down after air drying or drying.
Further, in the manufacturing work of the aluminum alloy handrail, the length of the first straight pipe part is slightly smaller than the length of a single carriage of the urban rail train.
Further, in the manufacturing work of the aluminum alloy handrail, the length of the second straight pipe part is matched with the length of the connecting section of two adjacent carriages in the urban rail train.
Further, in the manufacturing work of the aluminum alloy handrail, the bending radians of the first bent pipe part and the second bent pipe part are equal.
Further, in the manufacturing work of the aluminum alloy handrail, the circle center angle corresponding to the opening of the opening pipe part in the first aluminum profile is 90-120 degrees.
Further, in the above aluminum alloy handrail manufacturing work, a reinforcing pipe member made of an aluminum alloy material and having an outer diameter equal to an inner diameter of the open pipe portion is inserted into the open pipe portion before the first aluminum profile is quenched and bent.
Furthermore, in the manufacturing work of the aluminum alloy handrail, five open pipe parts are uniformly arranged in the outer pipe body in the circumferential direction around the axis, and two reinforcing rib plates are connected between the outer wall of each open pipe part and the inner wall of the outer pipe body.
Furthermore, in the manufacturing work of the aluminum alloy handrail, the hose is a plastic steel wire pipe which can adapt to the relative motion of two adjacent carriages in the running process of an urban rail train, and the outer side of the hose is coated with an insulating layer.
Further, in the manufacturing work of the aluminum alloy handrail, the aluminum alloy handrail pipe I and the aluminum alloy handrail pipe II can form a pipeline system for transmitting heat-conducting or cold-conducting media after being fixed in sequence.
The invention has the beneficial effects that:
1. the aluminum alloy handrail manufactured by the manufacturing process of the aluminum alloy handrail has excellent structural performance, can meet certain static load without generating the problems of permanent deformation, fracture and the like when being used as a handrail of an urban rail train, fully exerts the advantages of light weight and easiness in forming of the aluminum alloy material, and expands the application range of the aluminum alloy material.
2. The aluminum alloy handrail manufactured by the manufacturing process of the aluminum alloy handrail has rich functions, can be used as a pipeline system to heat or refrigerate a carriage in addition to being used as the handrail, and fully utilizes the advantage of penetrating through the carriage to control the temperature in the carriage.
Of course, it is not necessary for any one product that embodies the invention to achieve all of the above advantages simultaneously.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic view of a piping system according to the present invention;
FIG. 2 is a schematic structural view of an aluminum alloy handrail member I according to the present invention;
FIG. 3 is a schematic view of the assembly step of the present invention;
FIG. 4 is a schematic cross-sectional view of a second aluminum profile of the present invention;
FIG. 5 is a schematic cross-sectional view of a first aluminum profile of the present invention;
FIG. 6 is a schematic view of the installation of the reinforced pipe of the present invention;
in the drawings, the parts are numbered as follows:
1-a first straight pipe part, 101-an outer pipe body, 102-an open pipe part, 103-a reinforcing rib plate, 2-a first bent pipe part, 3-a second straight pipe part, 4-a second bent pipe part, 5-a hose, 6-a sealing pipe fitting joint, 7-an opening valve and 8-a reinforcing pipe fitting.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example one
Referring to fig. 1-5, the present embodiment is a manufacturing process of an aluminum alloy handrail, including the following steps:
1) preparing an aluminum alloy handrail pipe fitting I:
aluminum alloy handrail pipe fitting I includes first straight tube portion 1 and is located the first bent pipe portion 2 of its both sides, and first straight tube portion 1 and the first bent pipe portion 2 structure as an organic whole of both sides, and aluminum alloy handrail pipe fitting I is made through the quenching bending by first aluminium alloy, and first aluminium alloy is made through extruding the mode by aluminium alloy extrusion moulding machine. The first aluminum profile is composed of an outer tube body 101, open tube parts 102 and reinforcing rib plates 103, five open tube parts 102 are uniformly arranged in the outer tube body 101 in the circumferential direction around an axis, the open ends of two adjacent open tube parts 102 are connected into a whole, two reinforcing rib plates 103 are connected between the outer wall of the open tube part 102 and the inner wall of the outer tube body 101, and a channel surrounded by all the open tube parts 102 serves as a first water guide channel.
2) Preparing an aluminum alloy handrail pipe fitting II:
the aluminum alloy handrail pipe fitting II comprises a second straight pipe part 3 and second bent pipe parts 4 positioned on two sides of the second straight pipe part, the second straight pipe part 3 and the second bent pipe parts 4 on two sides are of an integral structure, the aluminum alloy handrail pipe fitting II is made of a second aluminum profile through quenching and bending, and the second aluminum profile is made of an aluminum profile extrusion forming machine through an extrusion mode. The inside of second aluminium alloy is equipped with the cross-section and is circular shape second water guide channel, and aluminum alloy handrail pipe fitting II is located the outer end fixed mounting of second bent pipe portion 4 and has hose 5, and aluminum alloy handrail pipe fitting II is located the middle part of second straight pipe portion 3 and is equipped with aperture valve 7 that can control the second water guide channel degree of opening and shutting.
3) Assembling:
aluminum alloy handrail pipe fitting I passes through sealed pipe fitting joint and is fixed with aluminum alloy handrail pipe fitting II, and first water guide channel can communicate each other with the second water guide channel through sealed pipe fitting joint 6.
In the embodiment, after the first aluminum profile and the second aluminum profile are molded, the outer surfaces of the first aluminum profile and the second aluminum profile are subjected to sand blasting treatment, a workpiece is hung on a mounting rack of a sand blasting machine, steel shot is used for sand blasting, then the hung workpiece is hung again after being inverted, sand blasting is performed again, and after the sand blasting is finished, a blower is used for blowing air into the through hole, so that sand grains cannot remain in the through hole; then, the inner and outer surfaces of the first aluminum profile and the second aluminum profile are subjected to natural color anodic oxidation treatment, the workpiece is mounted on a hanging frame, oil is removed, alkali washing is carried out by sodium hydroxide, the black film on the surface is completely removed by nitric acid during neutralization, soaking and washing are carried out by water at 50-60 ℃, and the workpiece is taken down after air drying or drying.
In this embodiment, the length of the first straight pipe portion 1 is slightly less than the length of a single carriage of an urban rail train. The length of the second straight pipe part 3 is matched with the length of the connecting section of two adjacent carriages in the urban rail train. The first bent pipe portion 2 and the second bent pipe portion 4 have the same curvature.
In this embodiment, hose 5 is the plastics steel wire pipe that can adapt to two adjacent carriages relative motion in the urban rail train operation, and the outside cladding of hose 5 has the heat preservation.
In this embodiment, aluminum alloy handrail pipe fitting I, aluminum alloy handrail pipe fitting II can form the pipe-line system who is used for transmitting heat conduction or leads cold medium after fixed in proper order, and this pipe-line system cooperation wet return can with heating basin or refrigeration basin circulation intercommunication.
In this embodiment, the angle of the circle center corresponding to the opening of the open tube portion 102 in the first aluminum profile is 90 to 120 degrees.
One specific application of this embodiment is: the aluminum alloy handrail manufactured by the manufacturing process of the aluminum alloy handrail in the embodiment has excellent structural performance, can meet certain static load without generating problems of permanent deformation, fracture and the like when being used as a handrail of an urban rail train, fully exerts the advantages of light weight and easiness in forming of the aluminum alloy material, and expands the application range of the aluminum alloy material. The aluminum alloy handrail manufactured by the manufacturing process of the aluminum alloy handrail in the embodiment has rich functions, can be used as a pipeline system to heat or refrigerate a carriage besides being used as the handrail, fully utilizes the advantage of penetrating through the carriage to control the temperature in the carriage, and has longer running time of urban rail trains, so that compared with the energy consumption of the existing air-conditioning heating or refrigerating, the energy consumption of the 'heating' or 'cooling' with relative concept has the advantages of reducing the energy consumption and having good environmental protection effect; of course, it may also be an auxiliary device to work in conjunction with the air conditioner.
Example two
The structure and application of this embodiment are substantially the same as those of the first embodiment, except that, as shown in fig. 6, a reinforcing pipe member 8 is inserted into the open pipe portion 103 before the first aluminum profile is quenched and bent, and the reinforcing pipe member 8 is made of an aluminum alloy material and has an outer diameter equal to the inner diameter of the open pipe portion 103. The pipe fitting of strengthening pipe fitting 8 is less, therefore the crooked degree of difficulty is less, can carry out the self-adaptation along with first aluminium alloy crooked. Strengthen the design of pipe fitting 8, can further improve aluminum alloy handrail pipe fitting I's compressive strength, strengthen pipe fitting 8 simultaneously and can regard as heat accumulation spare or cold-storage spare.
The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Claims (10)
1. The manufacturing process of the aluminum alloy handrail is characterized by comprising the following steps of:
1) preparing an aluminum alloy handrail pipe fitting I:
the aluminum alloy handrail pipe fitting I comprises a first straight pipe part and first bent pipe parts positioned on two sides of the first straight pipe part, the first straight pipe part and the first bent pipe parts on two sides are of an integral structure, the aluminum alloy handrail pipe fitting I is made of a first aluminum profile through quenching and bending, and the first aluminum profile is made of an aluminum profile extrusion forming machine through an extrusion mode; the first aluminum profile is composed of an outer tube body, a plurality of open tube parts and reinforcing rib plates, the plurality of open tube parts are uniformly arranged in the outer tube body in the circumferential direction around an axis, the open ends of two adjacent open tube parts are connected into a whole, the plurality of reinforcing rib plates are connected between the outer wall of each open tube part and the inner wall of the outer tube body, and a channel formed by the surrounding of all the open tube parts serves as a first water guide channel;
2) preparing an aluminum alloy handrail pipe fitting II:
the aluminum alloy handrail pipe fitting II comprises a second straight pipe part and second bent pipe parts positioned on two sides of the second straight pipe part, the second straight pipe part and the second bent pipe parts on two sides are of an integral structure, the aluminum alloy handrail pipe fitting II is made of a second aluminum profile through quenching and bending, and the second aluminum profile is made of an aluminum profile extrusion forming machine through an extrusion mode; a second water guide channel with a circular section is arranged in the second aluminum profile, a hose is fixedly installed at the outer end, located at the second bent pipe part, of the aluminum alloy handrail pipe fitting II, and an opening valve capable of controlling the opening and closing degree of the second water guide channel is installed in the middle, located at the second straight pipe part, of the aluminum alloy handrail pipe fitting II;
3) assembling:
the aluminum alloy handrail pipe fitting I is fixed with the aluminum alloy handrail pipe fitting II through a sealing pipe fitting joint, and the first water guide channel can be communicated with the second water guide channel through the sealing pipe fitting joint.
2. The manufacturing process of the aluminum alloy handrail as claimed in claim 1, wherein: after the first aluminum profile and the second aluminum profile are molded, the outer surfaces of the first aluminum profile and the second aluminum profile are subjected to sand blasting treatment, a workpiece is hung on a mounting rack of a sand blasting machine, steel shot is used for sand blasting, then the hung workpiece is hung again after being inverted, sand blasting is performed again, and after the sand blasting is finished, a blower is used for blowing treatment in the through hole, so that sand grains cannot be remained in the through hole; then the inner and outer surfaces are treated by natural color anodic oxidation, the workpiece is arranged on a hanging rack, then oil is removed, sodium hydroxide is used for alkali cleaning, nitric acid is used for neutralizing to remove the surface black film completely during neutralization, 50-60 ℃ water is used for soaking and water cleaning, and the workpiece is taken down after air drying or drying.
3. The manufacturing process of the aluminum alloy handrail as claimed in claim 1, wherein: the length of the first straight pipe part is smaller than that of a single carriage of the urban rail train.
4. The manufacturing process of the aluminum alloy handrail as claimed in claim 1, wherein: the length of the second straight pipe part is matched with the length of the connecting section of two adjacent carriages in the urban rail train.
5. The manufacturing process of the aluminum alloy handrail as claimed in claim 1, wherein: the bending radians of the first bent pipe part and the second bent pipe part are equal.
6. The manufacturing process of the aluminum alloy handrail as claimed in claim 1, wherein: the circle center angle corresponding to the opening of the opening tube part in the first aluminum profile is 90-120 degrees.
7. The manufacturing process of the aluminum alloy handrail as claimed in claim 1, wherein: the first aluminum profile is inserted with a reinforced pipe fitting in the open pipe part before quenching and bending, the reinforced pipe fitting is made of aluminum alloy materials, and the outer diameter of the reinforced pipe fitting is equal to the inner diameter of the open pipe part.
8. The manufacturing process of the aluminum alloy handrail as claimed in claim 1, wherein: the inner part of the outer pipe body is uniformly provided with five open pipe parts in the circumferential direction around the axis, and two reinforcing rib plates are connected between the outer wall of each open pipe part and the inner wall of the outer pipe body.
9. The manufacturing process of the aluminum alloy handrail as claimed in claim 1, wherein: the flexible pipe is a plastic steel wire pipe which can adapt to relative movement of two adjacent carriages in the running process of the urban rail train, and the outer side of the flexible pipe is coated with a heat-insulating layer.
10. The manufacturing process of the aluminum alloy handrail as claimed in claim 1, wherein: the aluminum alloy handrail pipe fitting I and the aluminum alloy handrail pipe fitting II can form a pipeline system for transmitting heat-conducting or cold-conducting media after being fixed in sequence.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010726475.4A CN111842535B (en) | 2020-07-25 | 2020-07-25 | Manufacturing process of aluminum alloy handrail |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010726475.4A CN111842535B (en) | 2020-07-25 | 2020-07-25 | Manufacturing process of aluminum alloy handrail |
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| CN111842535A CN111842535A (en) | 2020-10-30 |
| CN111842535B true CN111842535B (en) | 2022-03-01 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112793609B (en) * | 2021-01-28 | 2022-03-01 | 江苏顺丰铝业有限公司 | Aluminum alloy handrail with reinforcing structure and preparation method thereof |
| CN112981194A (en) * | 2021-02-09 | 2021-06-18 | 东莞市东联铝业有限公司 | Anti-wrinkling aluminum profile and preparation method thereof |
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| CN108407688A (en) * | 2018-02-05 | 2018-08-17 | 安徽达尔智能控制系统股份有限公司 | Bus Multifunction armrests |
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| CN209041968U (en) * | 2018-09-30 | 2019-06-28 | 江苏升创管业有限公司 | The reinforcement handrail tube of rail traffic vehicles |
| CN209852311U (en) * | 2019-02-27 | 2019-12-27 | 江苏鑫润轨道交通车辆配件有限公司 | Horizontal handrail for track traffic |
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2020
- 2020-07-25 CN CN202010726475.4A patent/CN111842535B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11104751A (en) * | 1997-10-02 | 1999-04-20 | Furukawa Electric Co Ltd:The | Manufacture of aluminum alloy hollow frame product |
| CN103433341A (en) * | 2013-08-19 | 2013-12-11 | 天津东义镁制品股份有限公司 | Magnesium alloy extruded tube and method for brake forming of magnesium alloy extruded tube |
| CN108407688A (en) * | 2018-02-05 | 2018-08-17 | 安徽达尔智能控制系统股份有限公司 | Bus Multifunction armrests |
| CN108433410A (en) * | 2018-02-09 | 2018-08-24 | 江苏顺丰铝业有限公司 | Aluminium alloy handrail manufacture craft |
| CN208530376U (en) * | 2018-07-16 | 2019-02-22 | 同济大学 | A kind of bus tail gas clean-up secondary utilization device |
| CN209041968U (en) * | 2018-09-30 | 2019-06-28 | 江苏升创管业有限公司 | The reinforcement handrail tube of rail traffic vehicles |
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