CN111713847B - Application method of curved paint brush - Google Patents
Application method of curved paint brush Download PDFInfo
- Publication number
- CN111713847B CN111713847B CN202010593190.8A CN202010593190A CN111713847B CN 111713847 B CN111713847 B CN 111713847B CN 202010593190 A CN202010593190 A CN 202010593190A CN 111713847 B CN111713847 B CN 111713847B
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- China
- Prior art keywords
- paint
- handle
- metal sheet
- memory metal
- heat preservation
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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
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- A—HUMAN NECESSITIES
- A46—BRUSHWARE
- A46B—BRUSHES
- A46B7/00—Bristle carriers arranged in the brush body
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- A—HUMAN NECESSITIES
- A46—BRUSHWARE
- A46B—BRUSHES
- A46B15/00—Other brushes; Brushes with additional arrangements
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- A—HUMAN NECESSITIES
- A46—BRUSHWARE
- A46B—BRUSHES
- A46B15/00—Other brushes; Brushes with additional arrangements
- A46B15/0002—Arrangements for enhancing monitoring or controlling the brushing process
- A46B15/0004—Arrangements for enhancing monitoring or controlling the brushing process with a controlling means
- A46B15/0012—Arrangements for enhancing monitoring or controlling the brushing process with a controlling means with a pressure controlling device
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- A—HUMAN NECESSITIES
- A46—BRUSHWARE
- A46B—BRUSHES
- A46B5/00—Brush bodies; Handles integral with brushware
- A46B5/002—Brush bodies; Handles integral with brushware having articulations, joints or flexible portions
- A46B5/0033—Brush bodies; Handles integral with brushware having articulations, joints or flexible portions bending or stretching or collapsing
- A46B5/0037—Flexible resilience by plastic deformation of the material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D1/00—Processes for applying liquids or other fluent materials
- B05D1/28—Processes for applying liquids or other fluent materials performed by transfer from the surfaces of elements carrying the liquid or other fluent material, e.g. brushes, pads, rollers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/04—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to gases
- B05D3/0406—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to gases the gas being air
- B05D3/0413—Heating with air
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- A—HUMAN NECESSITIES
- A46—BRUSHWARE
- A46B—BRUSHES
- A46B2200/00—Brushes characterized by their functions, uses or applications
- A46B2200/20—Brushes for applying products to surfaces in general
- A46B2200/202—Applicator paint brush
Landscapes
- Coating Apparatus (AREA)
Abstract
The invention discloses a use method of a curved paint brush, which relates to the technical field of handrail maintenance devices and comprises a handle and a brush head, wherein the top of the handle is connected with the brush head, a power supply is arranged in the handle, a button is arranged on the outer side of the handle, the button is electrically connected with the power supply, the brush head comprises a heat preservation shell, a memory metal sheet and a paint brush, the middle part of one side of the heat preservation shell is fixedly connected to the handle, the memory metal sheet is fixedly connected to one side of the heat preservation shell, which is far away from the handle, and a plurality of groups of paint brushes are fixedly connected to one side of the memory metal sheet, which is far away from the heat preservation shell. And the drying effect on the whole paint layer is uniform.
Description
Technical Field
The invention relates to the technical field of railing maintenance devices, in particular to a use method of a curved paint brush.
Background
The paint is a chemical mixture coating which can firmly cover the surface of an object and has the functions of protection, decoration, marking and other special purposes, generally, the paint is mainly used for protecting the painted object, the painted object is prevented from directly contacting with the outside to accelerate the loss, and therefore the service life of the painted object is prolonged.
When painting to being painted object surface coating, need use the paintbrush, current paintbrush generally is drum-type or straight plate-type paintbrush, when carrying out the mopping to curved surface objects such as railing, because the binding face is less, the mopping effect is not good, needs dip in the painting mopping many times repeatedly, influences work efficiency.
In order to improve and railing curved surface laminating area, the curved surface brush has appeared, but fixed curved surface brush dips in lacquer inconvenient, makes the outer part of paint removal brush be stained with paint easily, is difficult to control and dips in the lacquer volume, and difficult effectively laminates to the curved surface of different curvatures.
Disclosure of Invention
The invention provides a use method of a curved paint brush, and aims to solve the problems that a fixed curved brush in the traditional technology is inconvenient to dip paint, parts outside an oil paint brush are easy to stick paint, the paint dipping amount is difficult to control, and curved surfaces with different curvatures are difficult to effectively attach.
In order to achieve the purpose, the invention adopts the following technical scheme:
a use method of a curved paint brush comprises the following specific steps:
s1, completing the installation and electrical connection of the handle, the brush head and the internal devices thereof;
s2, dipping paint liquid by using a paint brush on the brush head, and enabling the middle part of the brush head to lean against a painted object slightly;
s3, starting a button, enabling a heating wire to work to heat, and enabling the memory metal sheet to absorb heat and change from a straight state to a curled state;
s4, the memory metal sheet drives the heat preservation shell to curl along with the heat preservation shell until the sliding rod is extruded by the surface of the object to be painted, the conductive contact and the conductive sheet are connected, at the moment, the driving circuit controls the memory metal sheet to maintain the current state of being completely attached to the curved surface of the object to be painted, and then painting is carried out;
the paint brush with the curved surface comprises a handle and a brush head, wherein the brush head is connected to the top of the handle, a power supply is arranged in the handle, a button is arranged on the outer side of the handle, the button is electrically connected with the power supply, the brush head comprises a heat-insulating shell, a memory metal sheet and a paint brush, the middle of one side of the heat-insulating shell is fixedly connected to the handle, the memory metal sheet is fixedly connected to one side, away from the handle, of the heat-insulating shell, and a plurality of groups of paint brushes are fixedly connected to one side, away from the heat-insulating shell, of the memory metal sheet;
the utility model discloses a paint brush, including memory metal piece, heating wire, drive circuit, setting up in the handle top, the heat preservation shell has seted up the dead slot, the dead slot is kept away from memory metal piece one side and is installed the admission valve, the admission valve is by external one-way conduction to the dead slot in, dead slot week side intercommunication has the clearance of giving vent to anger, the clearance of giving vent to anger is seted up in the one side that the heat preservation shell is close to the paint brush, the heat preservation shell is kept away from and is all seted up the sliding tray in handle one side both ends, two bottom fixedly connected with buffer spring and conducting strip in the sliding tray, buffer spring keeps away from sliding tray one end fixedly connected with slide bar, slide bar bottom fixedly connected with conductive contact, conductive contact and conducting strip all with drive circuit electric connection.
Preferably, the heat preservation shell is made of elastic materials, a heat preservation cotton net is arranged in the heat preservation shell, and the heat preservation cotton net is located on one side far away from the memory metal sheet.
Preferably, the memory metal sheet is in a flat state in an initial state, in a curled state after being heated and finally folded into a round state.
Preferably, the paint brushes are distributed in a uniform gap staggered mode, and form full coverage in the brushing direction.
Preferably, the driving circuit controls the working current of the heating wire to gradually rise until the current working current is maintained after the conductive contact and the conductive sheet are contacted.
Compared with the prior art, the invention has the following beneficial effects:
1. when the memory metal sheet is in a straight state during paint dipping, compared with a fixed curved brush, the memory metal sheet is easy to control the paint dipping amount, and parts outside the paint removing brush are not easy to be stained with paint, so that paint waste caused by paint dripping and other parts stained with paint due to excessive paint dipping is reduced.
2. When the handrail is painted, the middle part of the brush head lightly supports against the handrail after the handrail is dipped with paint, the power supply is started, the driving circuit starts to gradually increase the working current of the heating wire, so that the heating value of the heating wire is gradually increased, the memory metal sheet is gradually changed from a straight state to a curled state along with the temperature rise, the memory metal sheet drives the paint brush to gradually attach to the curved surface of the handrail, the heat preservation shell is also bent along with the memory metal sheet until the sliding rods at the two ends of the heat preservation shell support against the surface of the handrail and are extruded to a certain degree, so that the conductive contacts on the sliding rods electrically contact with the conductive sheets, the driving circuit maintains the current working current, and the memory metal sheet maintains the curled state of being completely attached to the surface of the handrail at present, so that the effective painting operation for attaching the handrails with different curved surfaces is convenient, and the painting efficiency is higher.
3. In the painting process, when the sliding rod is extruded by the memory metal sheet and the surface of the railing, the extrusion depth is controlled by the buffer spring, so that the contact depth of the paint brush and the surface of the railing is controlled, the resistance of the paint brush and the surface of the railing is kept consistent in all directions, the hand feeling in the painting process is improved, the painting depth is conveniently controlled, and the painting effect is improved.
4. In the painting process, the heat emitted after the memory metal sheet absorbs the heat is transferred to the empty groove in the heat insulation shell, under the heat insulation of the heat insulation shell, hot air in the empty groove is blown out through the air outlet gap communicated with the empty groove, and the hot air dries the surface of the railing brushed by the paint brush, so that the drying of the paint is accelerated, and the painting effect is prevented from being influenced by the flow of the paint; meanwhile, the mode of brushing and drying is compared with drying after brushing, the drying effect on the whole paint layer is uniform, and the problem that the inner paint layer is not dried after brushing is avoided.
In conclusion, the invention is convenient to dip paint and control the paint dipping depth when the paint is dipped, is beneficial to completely attaching to the curved surfaces of the railings with different curvatures and is easy to control the paint brushing depth when the paint is brushed, reduces the peculiar smell of the paint sucked by workers in the paint brushing process, forms the effect of brushing the paint and drying the paint simultaneously, effectively avoids the problem of paint flowing, and has uniform drying effect on the whole paint layer.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic top view of the portion of the head of FIG. 1 of the present invention;
FIG. 3 is an enlarged view of portion A of FIG. 1 in accordance with the present invention;
FIG. 4 is a diagram illustrating a rolled state of a memory metal sheet according to the present invention;
FIG. 5 is a schematic view of the closed state of the memory metal sheet according to the present invention.
In the figure: 1 handle, 11 power, 12 buttons, 2 brush heads, 3 heat preservation shells, 31 empty slots, 32 air outlet gaps, 33 sliding slots, 34 air inlet valves, 4 memory metal sheets, 41 heating wires, 5 paint brushes, 6 driving circuits, 7 sliding rods, 71 buffer springs, 72 conductive contacts and 73 conductive sheets.
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.
Referring to fig. 1-5, a method for using a curved paint brush specifically comprises the following steps:
s1, completing the installation and electrical connection of the handle 1, the brush head 2 and the internal devices thereof;
s2, dipping paint liquid by using a paint brush on the brush head 2, and enabling the middle part of the brush head 2 to lean against a painted object lightly;
s3, starting the button 12, the heating wire 41 works to heat, and the memory metal sheet 4 absorbs heat and is converted from a straight state to a curled state;
s4, the memory metal sheet 4 drives the heat preservation shell 3 to curl along with the heat preservation shell until the sliding rod 7 is extruded by the surface of the object to be painted, the conductive contact 72 and the conductive sheet 73 are connected, at the moment, the driving circuit 6 controls the memory metal sheet 4 to maintain the current state of being completely attached to the curved surface of the object to be painted, and then painting is carried out;
the application method of the curved surface paint brush also relates to a paint brush, the paint brush comprises a handle 1 and a brush head 2, the brush head 2 is connected to the top of the handle 1, a power supply 11 is arranged in the handle 1, a button 12 is arranged on the outer side of the handle 1, the button 12 is electrically connected with the power supply 11, and the button 12 controls the power supply 11 to be turned on and off.
The side of the heat preservation shell 3 far away from the handle 1 is fixedly connected with a memory metal sheet 4, the memory metal sheet 4 is made of nickel titanium (NiTi) memory metal, and is in a straight state at low temperature and in a curled state at high temperature and finally folded into a round state.
The memory metal sheet 4 is embedded with a heating wire 41, the heating wire 41 is electrically connected with the driving circuit 6, the driving circuit 6 is embedded in the top of the handle 1 and is electrically connected with the power supply 11, and the driving circuit 6 controls the working current of the heating wire 41 to gradually rise, so that the temperature of the memory metal sheet 4 is gradually increased, and the curling degree of the memory metal sheet is gradually increased.
The heat preservation shell 3 is internally provided with an empty groove 31, the empty groove 31 is far away from one side of the memory metal sheet 4 and is provided with an air inlet valve 34, the air inlet valve 34 is conducted from the outside to the empty groove 31 in a single direction, the periphery of the empty groove 31 is communicated with an air outlet gap 32, the air outlet gap 32 is arranged on one side of the heat preservation shell 3 close to the paint brush 5, because the heat preservation cotton net is positioned on one side of the heat preservation metal sheet 4, the heat emitted by the memory metal sheet 4 is easily transferred to the empty groove 31, the air in the empty groove 31 is blown out from the air outlet gap 32 after being heated and expanded, and the outside air is supplemented to the empty groove 31 from the air inlet valve 34.
Sliding grooves 33 are formed in two ends of the heat preservation shell 3 far away from the handle 1, a buffer spring 71 and a conducting strip 73 are fixedly connected to the bottom of the two sliding grooves 33, the buffer spring 71 is far away from one end of the sliding groove 33 and is fixedly connected with a sliding rod 7, a conducting contact 72 is fixedly connected to the bottom of the sliding rod 7, and the conducting contact 72 and the conducting strip 73 are electrically connected with a driving circuit 6.
When the sliding rod 7 is pressed by the memory metal sheet 4 and the surface of the object to be painted, the elastic force of the buffer spring 71 is overcome, and the conductive contact 72 and the conductive sheet 73 are contacted, so that the current working current of the driving circuit 6 is maintained after the contact.
The principles of the present invention are now described as follows:
when paint is dipped, the memory metal sheet 4 is in a low-temperature straight state, compared with a fixed curved surface brush, the paint dipping amount is easy to control, and parts outside the paint removing brush 5 are not easy to be stained with paint, so that paint waste caused by paint dripping and paint staining of other parts due to excessive paint dipping is reduced;
when painting is carried out on the handrail, the middle part of the brush head 2 is lightly pressed against the handrail after the handrail is dipped with the paint, the button 12 on the handle 1 is started, the power supply 11 electrically connected with the button 12 supplies power at the moment, the driving circuit 6 electrically connected with the power supply 11 starts to gradually increase the working current of the heating wire 41 electrically connected with the driving circuit, so that the heating amount of the heating wire 41 is gradually increased, the memory metal sheet 4 is gradually changed from a straight state to a curled state along with the temperature rise, and the memory metal sheet 4 drives a plurality of groups of paint brushes 5 to gradually adhere to the curved surface of the handrail;
the heat preservation shell 3 is also bent along with the memory metal sheet 4 until the sliding rods 7 which are connected in the sliding grooves 33 at the two ends of the heat preservation shell 3 in a sliding mode abut against the surface of the handrail and are extruded to a certain extent, the pressure overcomes the elastic force of the buffer spring 71 connected between the sliding groove 33 and the sliding rod 7, the conductive contact 72 at the bottom of the sliding rod 7 is electrically contacted with the conductive sheet 73 at the bottom of the sliding groove 33, the driving circuit 6 electrically connected with the sliding rod is enabled to maintain the current working current after the contact, and the memory metal sheet 4 maintains the current curling state completely jointed with the surface of the handrail, so that the effective painting operation for jointing the handrails with different curvature surfaces is facilitated, and the painting efficiency is higher;
in the painting process, when the sliding rod 7 is extruded by the memory metal sheet 4 and the surface of the railing, the extrusion depth is controlled by the buffer spring 71, so that the contact depth of the paint brush 5 and the surface of the railing is controlled, the resistance of the paint brush 5 and the surface of the railing is kept consistent in all directions, the hand feeling in the painting process is improved, the painting depth is conveniently controlled, and the painting effect is improved; in the painting process, the heat emitted after the memory metal sheet 4 absorbs the heat is transferred to the empty slot 31 in the heat preservation shell 3, the air in the empty slot 31 is heated and expanded under the heat preservation condition of the heat preservation shell 3, the hot air is blown out through the air outlet gap 32 communicated with the empty slot 31, and the outside air enters from the air inlet valve 34 on the empty slot 31, so that the outside air flow is guided to flow to the railing, the paint odor breathed by painting workers is reduced, and the painting experience is improved;
meanwhile, the hot air dries the surface of the handrail brushed by the paint brush 5, so that the drying of the paint is accelerated, the paint brushing effect is prevented from being influenced by the flow of the paint, and the paint brushing effect is further improved;
meanwhile, the mode of brushing and drying is compared with drying after brushing, the drying effect on the whole paint layer is uniform, the problem that the inner paint layer is not dried after brushing is avoided, and the problem that the paint layer is easy to fall off due to the fact that the inner layer is not dried is avoided.
In conclusion, the invention is convenient to dip paint and control the paint dipping depth when the paint is dipped, is beneficial to completely attaching to the curved surfaces of the railings with different curvatures and is easy to control the paint brushing depth when the paint is brushed, reduces the peculiar smell of the paint sucked by workers in the paint brushing process, forms the effect of brushing the paint and drying the paint simultaneously, effectively avoids the problem of paint flowing, and has uniform drying effect on the whole paint layer.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (5)
1. A use method of a curved paint brush is characterized by comprising the following specific steps:
s1, completing the installation and the electrical connection of the handle (1), the brush head (2) and the internal devices thereof;
s2, dipping paint liquid by using a paint brush on the brush head (2), and slightly leaning the middle part of the brush head (2) against a painted object;
s3, starting a button (12), wherein the heating wire (41) generates heat when working, and the memory metal sheet (4) absorbs heat and is converted from a straight state to a curled state;
s4, the memory metal sheet (4) drives the heat preservation shell (3) to curl along with the heat preservation shell until the sliding rod (7) is extruded by the surface of the object to be painted, the conductive contact (72) and the conductive sheet (73) are connected, at the moment, the driving circuit (6) controls the memory metal sheet (4) to maintain the current state of being completely attached to the curved surface of the object to be painted, and then painting is carried out;
the using method of the curved surface paint brush further relates to a paint brush, the paint brush comprises a handle (1) and a brush head (2), the brush head (2) is connected to the top of the handle (1), a power supply (11) is arranged in the handle (1), a button (12) is installed on the outer side of the handle (1), the button (12) is electrically connected with the power supply (11), the brush head (2) comprises a heat-insulating shell (3), a memory metal sheet (4) and a paint brush (5), the middle part of one side of the heat-insulating shell (3) is fixedly connected to the handle (1), the side, away from the handle (1), of the heat-insulating shell (3) is fixedly connected with the memory metal sheet (4), and a plurality of groups of paint brushes (5) are fixedly connected to one side, away from the heat-insulating shell (3), of the memory metal sheet (4);
memory sheetmetal (4) are embedded to have electric wire (41) that generate heat, electric wire (41) electric connection drive circuit (6) generate heat, drive circuit (6) are built-in handle (1) top and electric connection power (11), open slot (31) have been seted up in heat preservation shell (3), memory sheetmetal (4) one side is kept away from in open slot (31) installs admission valve (34), admission valve (34) are by external one-way conduction in to open slot (31), open slot (31) week side intercommunication has air outlet gap (32), air outlet gap (32) are seted up in one side that heat preservation shell (3) are close to the paint brush, heat preservation shell (3) are kept away from in handle (1) one side both ends and all seted up sliding tray (33), two bottom fixedly connected with buffer spring (71) and buffer spring (73) in sliding tray (33), buffer spring (71) are kept away from sliding tray (33) one end fixedly connected with slide bar (7), the bottom of the sliding rod (7) is fixedly connected with a conductive contact (72), the conductive contact (72) and the conductive sheet (73) are both electrically connected with the driving circuit (6), when the sliding rod (7) is extruded by the memory metal sheet (4) and the surface of an object to be painted, the elastic force of the buffer spring (71) is overcome, the conductive contact (72) is contacted with the conductive sheet (73), and the driving circuit (6) maintains the current working current after the contact.
2. The use method of the curved paint brush as claimed in claim 1, wherein the heat preservation shell (3) is made of elastic material and is internally provided with a heat preservation cotton net, and the heat preservation cotton net is positioned on one side far away from the memory metal sheet (4).
3. A method of use of a curved paint brush as claimed in claim 1, wherein the memory metal sheet (4) is initially flat, curled after heating and finally closed to a round shape.
4. A method of use of a curved paint brush according to claim 1 wherein the sets of paint brushes (5) are in a uniform gap staggered arrangement and form full coverage in the direction of brushing.
5. The use method of the curved paint brush as claimed in claim 1, wherein the driving circuit (6) controls the working current of the heating wire (41) to gradually rise until the current working current is maintained after the conductive contact (72) and the conductive sheet (73) are contacted.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010593190.8A CN111713847B (en) | 2020-06-26 | 2020-06-26 | Application method of curved paint brush |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010593190.8A CN111713847B (en) | 2020-06-26 | 2020-06-26 | Application method of curved paint brush |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111713847A CN111713847A (en) | 2020-09-29 |
| CN111713847B true CN111713847B (en) | 2022-01-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010593190.8A Active CN111713847B (en) | 2020-06-26 | 2020-06-26 | Application method of curved paint brush |
Country Status (1)
| Country | Link |
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| CN (1) | CN111713847B (en) |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102009003969B4 (en) * | 2009-03-12 | 2011-06-09 | Ali Aghakhani | Brush for the painting of pipes |
| CN104939491A (en) * | 2014-03-28 | 2015-09-30 | 刘智红 | Curved-surface paint brush |
| CN204519742U (en) * | 2015-04-20 | 2015-08-05 | 宜宾云辰乔木园林有限责任公司 | A kind of flexible brush |
| CN204654141U (en) * | 2015-05-26 | 2015-09-23 | 中建安装工程有限公司 | A kind of novel pipeline special oil painting brush |
| CN106723920B (en) * | 2015-07-17 | 2018-06-22 | 颜荣土 | A kind of brushing mechanical equipment applied to building vertical column using curved angle |
| CN109984453A (en) * | 2017-12-31 | 2019-07-09 | 青岛迪恩特新材料科技有限公司 | A kind of changeable paint brush |
| CN110664107A (en) * | 2019-09-19 | 2020-01-10 | 桐城市桃花制刷有限公司 | Pipeline paint brush |
-
2020
- 2020-06-26 CN CN202010593190.8A patent/CN111713847B/en active Active
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| CN111713847A (en) | 2020-09-29 |
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Inventor after: Yao Xinyuan Inventor after: Xiao Yongyong Inventor after: Xu Junjun Inventor before: Xiao Yongyong Inventor before: Xu Junjun |
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