CN111376917A - Method for processing shielding door threshold by adopting PVC plastic coating - Google Patents
Method for processing shielding door threshold by adopting PVC plastic coating Download PDFInfo
- Publication number
- CN111376917A CN111376917A CN201811611053.1A CN201811611053A CN111376917A CN 111376917 A CN111376917 A CN 111376917A CN 201811611053 A CN201811611053 A CN 201811611053A CN 111376917 A CN111376917 A CN 111376917A
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- Prior art keywords
- threshold
- workpiece
- support plate
- plate workpiece
- supporting plate
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61B—RAILWAY SYSTEMS; EQUIPMENT THEREFOR NOT OTHERWISE PROVIDED FOR
- B61B1/00—General arrangement of stations, platforms, or sidings; Railway networks; Rail vehicle marshalling systems
- B61B1/02—General arrangement of stations and platforms including protection devices for the passengers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B1/00—Processes of grinding or polishing; Use of auxiliary equipment in connection with such processes
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
- C23G1/08—Iron or steel
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/14—Cleaning or pickling metallic material with solutions or molten salts with alkaline solutions
-
- E—FIXED CONSTRUCTIONS
- E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
- E06B—FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES
- E06B1/00—Border constructions of openings in walls, floors, or ceilings; Frames to be rigidly mounted in such openings
- E06B1/70—Sills; Thresholds
Abstract
The invention discloses a method for treating a shielding door threshold by adopting a PVC plastic-coated process, which comprises the following steps: polishing the processed threshold support plate workpiece, and performing sand blasting treatment, wherein the sand blasting cleanliness is not lower than grade Sa 2; degreasing the threshold support plate workpiece subjected to sand blasting, and performing rust removal and oil removal by acid-base washing; placing the threshold support plate workpiece into an oven for heating, and controlling the temperature to be between 230 ℃ and 400 ℃; immersing the threshold supporting plate workpiece reaching the temperature into a fluidized bed, taking out the threshold supporting plate workpiece, blowing off redundant powder on the workpiece by using an air gun, and hanging the workpiece on an air drying table for 5-10 minutes; taking out the threshold supporting plate workpiece, hanging the threshold supporting plate workpiece in a natural cooling water tank, and cooling; and after cooling, taking down the threshold support plate workpiece to correct the hook hole to remove redundant flash. According to the invention, the surface of the threshold support plate is treated by using a PVC plastic-coated treatment mode, so that the subway shield door is effectively insulated from a building structure, the corrosion resistance of a product is improved, and the safety performance of the shield door is greatly improved.
Description
Technical Field
The invention relates to a method for treating a shielding door threshold, in particular to a method for treating the shielding door threshold by adopting a PVC plastic-coated process.
Background
With the continuous improvement of rail transit service level, the requirements on passenger safety, riding environment, energy conservation and the like are also continuously improved. The door body of the subway shield door is in direct contact with passengers, the shield door must be completely isolated from high-voltage electricity, most structural parts of the shield door are pipes, sections, plates and the like, indexes such as surface protection and insulation characteristics of the structural parts are particularly important, and the bottommost doorsill support plate and the base support the structural parts. In order to insulate the screen door from the building structure, the sill support plate and the base must be insulated and mounted in an insulated manner.
In the existing subway shielded door structure, a threshold supporting plate is usually of a galvanized carbon steel structure, and an insulating plate and an insulating sleeve which are made of PBT (polybutylene terephthalate) +30% glass fiber are additionally arranged on a threshold base connected with the lower part of the threshold supporting plate so as to achieve the purpose of insulating a subway shielded door system from a building and train power system. In the traditional structure, the galvanized structural part is easy to corrode; the glass fiber has low mechanical strength, is easy to break, and has not ideal performance such as voltage breakdown. The subway shield door is operated for a long time, and once the insulating plate or the insulating sleeve is damaged and the insulating property is invalid, the risk that the passenger takes place the incident such as electric shock will greatly increase.
Disclosure of Invention
In order to solve the problem that the insulation performance and the corrosion resistance of a support plate of a shield door threshold are insufficient, the invention provides a method for treating the shield door threshold by adopting a PVC plastic-coated process, which comprises the following specific steps:
polishing the processed threshold support plate workpiece, removing welding slag and splashing, performing blunting on sharp corners and sharp edges, and performing sand blasting treatment on the threshold support plate workpiece, wherein the sand blasting cleanliness is not lower than grade Sa 2; degreasing, acid-base washing and rust and oil removing are carried out on the threshold support plate workpiece subjected to sand blasting; placing the threshold support plate workpiece into an oven for heating, and controlling the temperature to be between 230 ℃ and 400 ℃; immersing the threshold support plate workpiece reaching the temperature into a fluidized bed, wherein the plastic immersion time is not more than 4 seconds, taking out the threshold support plate workpiece, blowing off redundant powder on the workpiece by using an air gun, hanging the workpiece on an air drying platform for 5-10 minutes, and fully leveling the whole workpiece by using the powder; taking out the threshold supporting plate workpiece, hanging the threshold supporting plate workpiece in a natural cooling water tank, and cooling; and after cooling, taking down the threshold support plate workpiece to correct the hook hole to remove redundant flash, and obtaining a threshold support plate finished product.
Wherein, degreasing and acid and alkali cleaning can be refined as follows: degreasing and deoiling a workpiece, washing with water, washing with acid, washing with water, and neutralizing with alkali, wherein the step of washing with acid can be implemented by derusting with sulfuric acid, hydrochloric acid or phosphoric acid, and the step of neutralizing with alkali is implemented by immersion washing with 5-10% sodium hydroxide aqueous solution until the ph is 7-8. To remove rust sufficiently.
The threshold supporting plate is a low-carbon steel plate.
In one preferred embodiment, when the thickness of the threshold supporting plate is 1.5-2.0 mm, the heating temperature of the oven is controlled to be 320-400 ℃.
In one preferred embodiment, when the thickness of the threshold supporting plate is 3.0-5.0 mm, the heating temperature of the oven is controlled to be 280-360 ℃.
In one preferred embodiment, when the thickness of the threshold supporting plate is 6.0mm or more, the oven heating temperature is controlled to 230 to 300 ℃.
As a preferred embodiment, the plastic coating time is 3 seconds, and the coating thickness of the plastic coating can reach 450-750 mu m in 3 seconds according to the coating thickness of 150-250 mu m per second.
As a preferred embodiment, compressed air is introduced under the vulcanizing bed, and the pressure of the compressed air is more than 1.0MPa, so that the PVC is fully vulcanized.
As a preferred embodiment, the ratio of the air pressure P1 in the powder cylinder and the air pressure P2 in the air charging chamber in the vulcanization bed is 1: 3.
the structures of the powder cylinder, the plenum chamber and the like in the fluidized bed are known to those skilled in the art and are not described herein.
According to the invention, the surface of the threshold support plate is treated by using a PVC plastic-coated treatment mode, so that the subway shield door is effectively insulated from a building structure, the corrosion resistance of a product is improved, and the safety performance of the shield door is greatly improved.
Compared with the traditional structure, the doorsill supporting plate treated by the method has the advantages that the surface treatment mode is changed from hot dip galvanizing to a PVC plastic coating process, the corrosion resistance of the structure is obviously improved, the quality of the doorsill supporting plate after plastic coating is stable, and the doorsill supporting plate has excellent insulating property and certain flame retardance. In the operation process of the shielding door, even if the insulating sleeve of the insulating plate on the base support is damaged and fails, the doorsill supporting plate can also exert the insulating function of the insulating sleeve and serve as the last layer of protective measures to prevent accidents.
Aiming at the characteristics of the shielding door, a PVC material is selected as a plastic coating layer, so that the shielding door is odorless, nontoxic and more environment-friendly; has excellent low temperature resistance, the lowest use temperature can reach-100 to-70 ℃, and the coating can be used in severe cold and low temperature environments. The chemical stability is better, and the corrosion resistance of most of acid and alkali can be realized. The corrosion resistance of the product coated with the plastic is excellent. The shielding door structure has excellent electrical insulation property, is used for shielding door structures, and effectively prevents passengers from electric shock accidents.
Detailed Description
The structure of the ultrasonic fuel excitation device according to the invention is further illustrated by the following example:
example one
A low carbon steel sheet having a thickness of 1.5 to 2.0mm is exemplified.
A method for processing a shielding door threshold by adopting a PVC plastic-coated process comprises the following specific steps:
1) the processed low-carbon steel threshold supporting plate workpiece is polished, welding slag is removed, splashing is conducted, sharp corners and sharp edges are blunted, sand blasting treatment is conducted on the threshold supporting plate workpiece, and sand blasting cleanliness is not lower than Sa2 level.
2) Degreasing and deoiling the threshold support plate workpiece subjected to sand blasting, carrying out primary washing, using a sulfuric acid solution to finish derusting, carrying out secondary washing, adopting a 5% sodium hydroxide aqueous solution for immersion washing, carrying out acid-base neutralization treatment, then washing, and using ph test paper to detect that the pH value of water reaches 7-8 for neutralization.
3) Placing the threshold support plate workpiece into an oven for heating, and controlling the temperature to be 320-400 ℃; immersing the threshold support plate workpiece reaching the temperature into a vulcanizing bed, communicating compressed air below the vulcanizing bed, ensuring that the PVC is fully vulcanized, controlling the air pressure P1 in the powder cylinder to be 0.8MP and controlling the air pressure P2 in the air charging chamber to be 2.4 MP. The plastic soaking time is 3 seconds.
4) Taking out the threshold supporting plate workpiece, blowing off redundant powder on the workpiece by using an air gun, hanging the workpiece on an air drying platform for 5-10 minutes, and fully leveling the whole workpiece by using the powder; taking out the threshold supporting plate workpiece, hanging the threshold supporting plate workpiece in a natural cooling water tank, and cooling; and after cooling, taking down the threshold support plate workpiece to correct the hook hole to remove redundant flash.
The concrete requirements are as follows:
(1) appearance test, color: green (project color must be uniform). Any exposed bottom condition cannot occur;
(2) spraying PVC insulating material on the surface;
(3) appearance test, shore hardness (a): not less than 40;
(4) inspecting the film thickness, wherein the thickness is 600-1000 mu m, and the coating of the cutting surface of the lining plate is covered;
the stud needs to be protected during spraying;
(5) and (4) resistance test, wherein the insulation value and the volume resistance are more than or equal to 3 × 108 unit omega.
Example two
Take a low carbon steel plate with a thickness of 3.0-5.0 mm as an example.
A method for processing a shielding door threshold by adopting a PVC plastic-coated process comprises the following specific steps:
1) the processed low-carbon steel threshold supporting plate workpiece is polished, welding slag is removed, splashing is conducted, sharp corners and sharp edges are blunted, sand blasting treatment is conducted on the threshold supporting plate workpiece, and sand blasting cleanliness is not lower than Sa2 level.
2) Degreasing and deoiling the threshold support plate workpiece subjected to sand blasting, carrying out primary washing, using a sulfuric acid solution to finish derusting, carrying out secondary washing, adopting a 5% sodium hydroxide aqueous solution for immersion washing, carrying out acid-base neutralization treatment, then washing, and using ph test paper to detect that the pH value of water reaches 7-8 for neutralization.
3) Placing the doorsill support plate workpiece into an oven for heating, and controlling the temperature to be 280-360 ℃; immersing the threshold support plate workpiece reaching the temperature into a vulcanizing bed, communicating compressed air below the vulcanizing bed, ensuring that the PVC is fully vulcanized, controlling the air pressure P1 in the powder cylinder to be 0.8MP and controlling the air pressure P2 in the air charging chamber to be 2.4 MP. The plastic soaking time is 2 seconds.
4) Taking out the threshold supporting plate workpiece, blowing off redundant powder on the workpiece by using an air gun, hanging the workpiece on an air drying platform for 5-10 minutes, and fully leveling the whole workpiece by using the powder; taking out the threshold supporting plate workpiece, hanging the threshold supporting plate workpiece in a natural cooling water tank, and cooling; and after cooling, taking down the threshold support plate workpiece to correct the hook hole to remove redundant flash.
The concrete requirements are as follows:
(1) appearance test, color: green (project color must be uniform). Any exposed bottom condition cannot occur;
(2) spraying PVC insulating material on the surface;
(3) appearance test, shore hardness (a): not less than 40;
(4) inspecting the film thickness, wherein the thickness is 600-1000 mu m, and the coating of the cutting surface of the lining plate is covered;
the stud needs to be protected during spraying;
(5) and (4) resistance test, wherein the insulation value and the volume resistance are more than or equal to 3 × 108 unit omega.
EXAMPLE III
A low-carbon steel sheet having a thickness of 6.0mm or more is exemplified.
A method for processing a shielding door threshold by adopting a PVC plastic-coated process comprises the following specific steps:
1) the processed low-carbon steel threshold supporting plate workpiece is polished, welding slag is removed, splashing is conducted, sharp corners and sharp edges are blunted, sand blasting treatment is conducted on the threshold supporting plate workpiece, and sand blasting cleanliness is not lower than Sa2 level.
2) Degreasing and deoiling the threshold support plate workpiece subjected to sand blasting, carrying out primary washing, using a sulfuric acid solution to finish derusting, carrying out secondary washing, adopting a 5% sodium hydroxide aqueous solution for immersion washing, carrying out acid-base neutralization treatment, then washing, and using ph test paper to detect that the pH value of water reaches 7-8 for neutralization.
3) Placing the threshold support plate workpiece into an oven for heating, and controlling the temperature to be 230-300 ℃; immersing the threshold support plate workpiece reaching the temperature into a vulcanizing bed, communicating compressed air below the vulcanizing bed, ensuring that the PVC is fully vulcanized, controlling the air pressure P1 in the powder cylinder to be 0.8MP and controlling the air pressure P2 in the air charging chamber to be 2.4 MP. The plastic soaking time is 2 seconds.
4) Taking out the threshold supporting plate workpiece, blowing off redundant powder on the workpiece by using an air gun, hanging the workpiece on an air drying platform for 5-10 minutes, and fully leveling the whole workpiece by using the powder; taking out the threshold supporting plate workpiece, hanging the threshold supporting plate workpiece in a natural cooling water tank, and cooling; and after cooling, taking down the threshold support plate workpiece to correct the hook hole to remove redundant flash.
The concrete requirements are as follows:
(1) appearance test, color: green (project color must be uniform). Any exposed bottom condition cannot occur;
(2) spraying PVC insulating material on the surface;
(3) appearance test, shore hardness (a): not less than 40;
(4) inspecting the film thickness, wherein the thickness is 600-1000 mu m, and the coating of the cutting surface of the lining plate is covered;
the stud needs to be protected during spraying;
(5) and (4) resistance test, wherein the insulation value and the volume resistance are more than or equal to 3 × 108 unit omega.
The foregoing shows and describes the general principles and features of the present invention, together with the advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (8)
1. A method for processing a shielding door threshold by adopting a PVC plastic-coated process comprises the following steps: polishing the processed threshold support plate workpiece, removing welding slag and splashing, performing blunting on sharp corners and sharp edges, and performing sand blasting treatment on the threshold support plate workpiece, wherein the sand blasting cleanliness is not lower than grade Sa 2; degreasing, acid-base washing and rust and oil removing are carried out on the threshold support plate workpiece subjected to sand blasting; placing the threshold support plate workpiece into an oven for heating, and controlling the temperature to be between 230 ℃ and 400 ℃; immersing the threshold support plate workpiece reaching the temperature into a fluidized bed, wherein the plastic immersion time is not more than 4 seconds, taking out the threshold support plate workpiece, blowing off redundant powder on the workpiece by using an air gun, hanging the workpiece on an air drying platform for 5-10 minutes, and fully leveling the whole workpiece by using the powder; taking out the threshold supporting plate workpiece, hanging the threshold supporting plate workpiece in a natural cooling water tank, and cooling; after cooling, taking down the threshold support plate workpiece to correct the hook hole to remove redundant flash; obtaining a threshold support plate finished product;
the threshold supporting plate is a low-carbon steel plate.
2. The method for treating the threshold of the shielding door by adopting the PVC plastic-coated process as claimed in claim 1, wherein the method comprises the following steps: the specific steps of degreasing and acid and alkali washing of the threshold support plate workpiece are sequentially degreasing and deoiling of the workpiece, washing with water, acid washing, washing with water and alkali washing until ph 7-8 is obtained.
3. The method for treating the threshold of the shielding door by adopting the PVC plastic-coated process as claimed in claim 1, wherein the method comprises the following steps: when the thickness of the threshold supporting plate is 1.5-2.0 mm, the heating temperature of the oven is controlled to be 320-400 ℃.
4. The method for treating the threshold of the shielding door by adopting the PVC plastic-coated process as claimed in claim 1, wherein the method comprises the following steps: when the thickness of the threshold supporting plate is 3.0-5.0 mm, the heating temperature of the oven is controlled to be 280-360 ℃.
5. The method for treating the threshold of the shielding door by adopting the PVC plastic-coated process as claimed in claim 1, wherein the method comprises the following steps: when the thickness of the threshold supporting plate is more than 6.0mm, the heating temperature of the oven is controlled to be 230-300 ℃.
6. The method for treating the threshold of the shielding door by adopting the PVC plastic-coated process as claimed in claim 1, wherein the method comprises the following steps: the plastic dipping time is 3 seconds, and the powder coating thickness can reach 450-750 mu m.
7. The method for treating the threshold of the shielding door by adopting the PVC plastic-coated process as claimed in claim 1, wherein the method comprises the following steps: compressed air is communicated under the vulcanizing bed, and the pressure of the compressed air is greater than 1.0MPa, so that the PVC is fully vulcanized.
8. The method for treating the threshold of the shielding door by adopting the PVC plastic-coated process as claimed in claim 1, wherein the method comprises the following steps: the ratio of the air pressure P1 in the powder cylinder in the vulcanizing bed to the air pressure P2 in the air charging chamber is 1: 3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811611053.1A CN111376917A (en) | 2018-12-27 | 2018-12-27 | Method for processing shielding door threshold by adopting PVC plastic coating |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811611053.1A CN111376917A (en) | 2018-12-27 | 2018-12-27 | Method for processing shielding door threshold by adopting PVC plastic coating |
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| Publication Number | Publication Date |
|---|---|
| CN111376917A true CN111376917A (en) | 2020-07-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811611053.1A Pending CN111376917A (en) | 2018-12-27 | 2018-12-27 | Method for processing shielding door threshold by adopting PVC plastic coating |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1175612A (en) * | 1996-07-23 | 1998-03-11 | 埃勒夫阿托化学有限公司 | Self-adhesive compositions with improved resistance to creepage, usable for coating metal substrates |
| CN1493418A (en) * | 2003-07-07 | 2004-05-05 | 北京科技大学 | Powder metallurgy static mould wall lubricating device |
| CN103266343A (en) * | 2013-05-24 | 2013-08-28 | 华南理工大学 | Surface roughening method of metal material |
| CN103921797A (en) * | 2013-01-16 | 2014-07-16 | 北京天乐泰力科技发展有限公司 | Metro shielding door insulation structure |
| CN204357271U (en) * | 2014-12-26 | 2015-05-27 | 南京康尼机电股份有限公司 | A kind of safety door for subway station threshold insulating mechanism |
| CN105642517A (en) * | 2016-01-07 | 2016-06-08 | 王良 | Preparation method for plastic-coated supporting framework and plastic-coated supporting framework |
| CN105983521A (en) * | 2015-02-13 | 2016-10-05 | 阳光电源股份有限公司 | Coating method for stainless steel welding parts |
| CN107740656A (en) * | 2017-10-20 | 2018-02-27 | 株洲合力电磁技术有限公司 | A kind of biparting Abdeckschieber door mounting structure and installation method |
-
2018
- 2018-12-27 CN CN201811611053.1A patent/CN111376917A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1175612A (en) * | 1996-07-23 | 1998-03-11 | 埃勒夫阿托化学有限公司 | Self-adhesive compositions with improved resistance to creepage, usable for coating metal substrates |
| CN1493418A (en) * | 2003-07-07 | 2004-05-05 | 北京科技大学 | Powder metallurgy static mould wall lubricating device |
| CN103921797A (en) * | 2013-01-16 | 2014-07-16 | 北京天乐泰力科技发展有限公司 | Metro shielding door insulation structure |
| CN103266343A (en) * | 2013-05-24 | 2013-08-28 | 华南理工大学 | Surface roughening method of metal material |
| CN204357271U (en) * | 2014-12-26 | 2015-05-27 | 南京康尼机电股份有限公司 | A kind of safety door for subway station threshold insulating mechanism |
| CN105983521A (en) * | 2015-02-13 | 2016-10-05 | 阳光电源股份有限公司 | Coating method for stainless steel welding parts |
| CN105642517A (en) * | 2016-01-07 | 2016-06-08 | 王良 | Preparation method for plastic-coated supporting framework and plastic-coated supporting framework |
| CN107740656A (en) * | 2017-10-20 | 2018-02-27 | 株洲合力电磁技术有限公司 | A kind of biparting Abdeckschieber door mounting structure and installation method |
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Application publication date: 20200707 |