CN113102150B - Spray nozzle structure for spraying paint on inner wall of plastic pipe - Google Patents
Spray nozzle structure for spraying paint on inner wall of plastic pipe Download PDFInfo
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- CN113102150B CN113102150B CN202110555180.XA CN202110555180A CN113102150B CN 113102150 B CN113102150 B CN 113102150B CN 202110555180 A CN202110555180 A CN 202110555180A CN 113102150 B CN113102150 B CN 113102150B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B13/00—Machines or plants for applying liquids or other fluent materials to surfaces of objects or other work by spraying, not covered by groups B05B1/00 - B05B11/00
- B05B13/06—Machines or plants for applying liquids or other fluent materials to surfaces of objects or other work by spraying, not covered by groups B05B1/00 - B05B11/00 specially designed for treating the inside of hollow bodies
- B05B13/0627—Arrangements of nozzles or spray heads specially adapted for treating the inside of hollow bodies
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
- B05B1/30—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
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- Spray Control Apparatus (AREA)
- Nozzles (AREA)
Abstract
The invention discloses a spray head structure for spraying paint on the inner wall of a plastic pipe, which comprises a spray head connector with a hollow interior, wherein one end of the spray head connector is provided with a connecting port communicated with the interior of the spray head connector, a plurality of telescopic adjustable spray heads communicated with the interior of the spray head connector are uniformly distributed on the outer wall of the spray head connector along the circumferential direction of the spray head connector, and a flow connector is arranged in a spout of each telescopic adjustable spray head in a sliding manner along the axial direction of the spout of each telescopic adjustable spray head; the spray head connecting head is rotatably provided with an adjusting part penetrating the spray head connecting head, a spray head length adjusting component is connected between the part of the adjusting part arranged in the spray head connecting head and each telescopic adjustable spray head, and a spray head flow adjusting component is connected between the part of the adjusting part arranged in the spray head connecting head and each flow connecting head; compared with the prior art, the spray head can be quickly adjusted to adapt to plastic pipes with different pipe diameters, and meanwhile, the spray flow of the spray head can be quickly adjusted to meet actual spray requirements.
Description
Technical Field
The invention relates to the technical field of spray head structures, in particular to a spray head structure for spraying paint on the inner wall of a plastic pipe.
Background
Plastic pipes are generally manufactured by extrusion processing of polyester as a main raw material in a plastic manufacturing machine by adding stabilizers, lubricants, plasticizers and the like. The pipe is mainly used as a pipeline for a tap water supply system of a house building, a sanitary pipe for drainage, exhaust and pollution discharge, an underground drainage pipe system, a rainwater pipe, a threading pipe for wire installation and assembly, and the like.
The inner wall of a plastic pipe is required to be subjected to paint spraying treatment in the processing process, the plastic pipe is placed on a workbench, a spray head is connected to one end of the paint spraying pipe, the paint spraying pipe is inserted into the plastic pipe, paint is introduced into the paint spraying pipe, and then the paint spraying pipe is sprayed out of the spray head to paint the inner wall of the plastic pipe; however, the structure of the spray head is fixed, so that the spray head can only spray paint plastic pipes with small diameters, and the spray head can not adjust the liquid outlet amount according to the requirements.
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention aims to provide a spray head structure for spraying paint on the inner wall of a plastic pipe, so as to solve the problems that in the prior art, the spray head can only spray paint on the plastic pipe with a small pipeline range and the liquid outlet amount of the spray head can not be regulated according to the requirement.
In order to achieve the above purpose, the present invention adopts the following technical scheme: the utility model provides a plastic tubing inner wall spray paint uses shower nozzle structure, includes inside hollow shower nozzle connector, shower nozzle connector one end is equipped with rather than the connector of interior intercommunication, has a plurality of telescopic adjustable shower nozzles rather than interior intercommunication on the shower nozzle connector outer wall along its circumference direction equipartition, all is provided with the flow connector along its axial direction slip in the spout of every telescopic adjustable shower nozzle; the spray head connecting head is rotatably provided with an adjusting part penetrating the spray head connecting head, a spray head length adjusting component is connected between the part of the adjusting part arranged in the spray head connecting head and each telescopic adjustable spray head, and a spray head flow adjusting component is connected between the part of the adjusting part arranged in the spray head connecting head and each flow connecting head;
the adjusting part drives each nozzle length adjusting component in a rotating mode to drive each telescopic adjustable nozzle to synchronously adjust in a telescopic way; and the adjusting part also drives each nozzle flow adjusting component in a rotating way to drive each flow connector to synchronously move along the axial direction of the corresponding telescopic adjustable nozzle so as to control the flow.
Compared with the prior art, the invention has the following beneficial effects:
according to the spray head structure for spraying paint on the inner wall of the plastic pipe, the length adjusting assembly of each spray head drives each telescopic adjustable spray head to synchronously stretch and adjust through the rotation adjusting part, so that a plurality of telescopic adjustable spray heads synchronously stretch or shorten, and the spray pipe stretches into plastic pipes with different pipe diameters to perform spray paint processing, and the practicality is enhanced; simultaneously, the rotation adjusting part can enable each spray head flow adjusting component to drive each flow connector to synchronously move along the corresponding telescopic adjustable spray head axial direction, so that the size of a spray opening of each telescopic adjustable spray head is adjusted, the paint flow sprayed out by each telescopic adjustable spray head is adjusted, and the actual requirements are met.
Drawings
FIG. 1 is a schematic diagram of an embodiment of the present invention;
FIG. 2 is a schematic view of the structure of the spray head of the present invention assembled with a plastic tube;
FIG. 3 is an enlarged view of a portion A of FIG. 2;
fig. 4 is a partial enlarged view of the portion B in fig. 3.
Detailed Description
The invention is described in further detail below by way of specific embodiments:
reference numerals in the drawings of the specification include: the adjustable shower nozzle of the shower nozzle connector 1, telescopic adjustable shower nozzle 2, fixed section of thick bamboo 201, remove section of thick bamboo 202, flow connector 3, flow control section of thick bamboo 4, shower nozzle regulating spindle 5, first supporting shoe 6, second supporting shoe 7, reset spring 8, haulage rope 9, drain hole 10, third supporting shoe 11, supporting spring 12, flowing back hole 13, haulage line 14, direction spout 15, elastic telescopic link 16, plastic tubing 17.
Referring to fig. 1, 2 and 4, an embodiment of the invention provides a spray head structure for spraying paint on the inner wall of a plastic pipe, which comprises a spray head connector 1 with a hollow inside, wherein one end of the spray head connector 1 is provided with a connecting port communicated with the inside, a plurality of telescopic adjustable spray heads 2 communicated with the inside are uniformly distributed on the outer wall of the spray head connector 1 along the circumferential direction of the spray head connector, and a flow connector 3 is slidably arranged in a nozzle of each telescopic adjustable spray head 2 along the axial direction of the spray head; the spray head connector 1 is rotatably provided with an adjusting part penetrating the spray head connector 1, a spray head length adjusting component is connected between the part of the adjusting part arranged in the spray head connector 1 and each telescopic adjustable spray head 2, and a spray head flow adjusting component is connected between the part of the adjusting part arranged in the spray head connector 1 and each flow connector 3; the adjusting part drives each nozzle length adjusting component in a rotating mode to drive each telescopic adjustable nozzle 2 to synchronously adjust in a telescopic way; and the adjusting part drives each nozzle flow adjusting component in a rotating way to drive each flow connector 3 to synchronously move along the axial direction of the corresponding telescopic adjustable nozzle 2 so as to control the flow.
The spray head structure for spraying paint on the inner wall of the plastic pipe enables each spray head length adjusting component to drive each telescopic adjustable spray head 2 to synchronously stretch and adjust through rotating the adjusting part, so that a plurality of telescopic adjustable spray heads 2 synchronously stretch or shorten, and the spray pipe can be stretched into plastic pipes 17 with different pipe diameters to perform paint spraying processing, and the practicality of the spray pipe is enhanced; simultaneously, the rotation adjusting part can enable each spray head flow adjusting component to drive each flow connector 3 to synchronously move along the axial direction of the corresponding telescopic adjustable spray head 2, so that the size of the spray nozzle of each telescopic adjustable spray head 2 is adjusted, the paint flow sprayed out of each telescopic adjustable spray head 2 is adjusted, and the actual requirements are met.
Referring to fig. 1 and 2, according to another embodiment of the present invention, the spray head structure for spraying paint on the inner wall of the plastic pipe further includes structural optimization of an adjusting portion, where the adjusting portion specifically adopted in the present invention includes a flow adjusting cylinder 4 and a spray head adjusting shaft 5, the flow adjusting cylinder 4 is freely threaded inside and outside the spray head connector 1, the spray head adjusting shaft 5 is freely threaded from two ends of the flow adjusting cylinder 4, the end of the flow adjusting cylinder 4 in the spray head connector 1 is connected with each spray head flow adjusting component, and the end of the spray head adjusting shaft 5 in the spray head connector 1 is connected with each spray head length adjusting component.
The flow rate adjusting cylinder 4 and the head adjusting shaft 5 are installed in the present invention in such a manner that they are conveniently rotatably adjusted.
The flow regulating cylinder 4 is rotated to enable each spray head flow regulating component to move, so that each flow connector 3 moves in the corresponding telescopic adjustable spray head 2, and the paint spraying flow of the telescopic adjustable spray heads 2 is synchronously increased or decreased; the spray head adjusting shaft 5 is rotated to enable each spray head length adjusting component to move, so that each telescopic adjustable spray head 2 can synchronously carry out telescopic adjustment, and the spray head for spraying paint on the inner wall of the plastic pipe 17 can be reasonably adjusted to extend into the plastic pipes 17 with different pipe diameters for spraying paint; and the threaded connection between the flow regulating cylinder 4 and the spray head connector 1 and the threaded connection between the spray head regulating shaft 5 and the flow regulating cylinder 4 are used for enabling the spray head to have a certain self-locking function, so that the requirement of the spray head structure for spraying paint on the inner wall of the plastic pipe during use can be met.
Referring to fig. 1 and 3, according to another embodiment of the present invention, the spray head structure for spraying paint on the inner wall of a plastic pipe further includes structural optimization of the telescopic adjustable spray heads 2, each telescopic adjustable spray head 2 adopted in the present invention includes a fixed cylinder 201 and a movable cylinder 202 with one end slidingly connected in the fixed cylinder 201, one end of the fixed cylinder 201 far away from the movable cylinder 202 is fixedly connected and communicated with the spray head connector 1, one end of the movable cylinder 202 far away from the spray head connector 1 is in a nozzle shape, a spray head length adjusting assembly is arranged among the fixed cylinder 201, the movable cylinder 202 and the spray head adjusting shaft 5, and a flow connector 3 is arranged in a nozzle end of the corresponding movable cylinder 202.
The movable cylinder 202 and the fixed cylinder 201 are combined into the telescopic adjustable spray head 2 so as to rotate the spray head adjusting shaft 5 to enable each spray head length adjusting assembly to operate to enable each movable cylinder 202 to move, and the length of each telescopic adjustable spray head 2 is adjusted; the liquid outlet end of the moving cylinder 202 is in a nozzle shape so as to spray the sprayed paint and improve the quality of the sprayed paint.
As shown in fig. 3, according to another embodiment of the present invention, the spray head structure for spraying paint on the inner wall of the plastic pipe further includes structural optimization of spray head length adjustment assemblies, each spray head length adjustment assembly adopted in the present invention includes a first support block 6 fixedly disposed on the inner wall of the liquid inlet end of the corresponding fixed cylinder 201 and a second support block 7 fixedly disposed on the inner wall of the liquid inlet end of the corresponding moving cylinder 202, a return spring 8 is connected between the first support block 6 and the second support block 7, a traction rope 9 is fixedly connected to the first support block 6, one end of the traction rope 9 far from the first support block 6 freely penetrates into the spray head connector 1 and then is wound around the spray head adjustment shaft 5 for multiple circles to be fixed, and a plurality of liquid guiding holes 10 are formed in the first support block 6 and the second support block 7.
When the spray head adjusting shaft 5 is rotated, the spray head adjusting shaft 5 is used for carrying out wire winding or paying-off on each traction rope 9, so that the second supporting block 7 in each spray head length adjusting assembly is moved towards the direction close to or far from the first supporting block 6, and the moving cylinder 202 in each spray head length adjusting assembly is moved towards the inside or the outside of the fixed cylinder 201, thereby achieving the aim of synchronously adjusting the length of each telescopic adjustable spray head 2; the plurality of liquid guide holes 10 on the first supporting block 6 and the second supporting block 7 are used for forming a conductive flow channel in the telescopic adjustable spray head 2 so as to facilitate the paint to pass through and spray out; the return spring 8 is provided to return the movable tube 202 by moving the movable tube in the opposite direction when the head adjusting shaft 5 pays out each of the pull ropes 9.
Referring to fig. 3 and 4, according to another embodiment of the present invention, the spray head structure for spraying paint on the inner wall of the plastic pipe further includes structural optimization of spray head flow adjustment assemblies, each spray head flow adjustment assembly adopted in the present invention includes a third support block 11 fixedly disposed on the inner wall of the liquid outlet end of the corresponding moving cylinder 202, and a support spring 12 connected between the third support block 11 and the corresponding flow connector 3, the third support block 11 is located between the liquid inlet end of the moving cylinder 202 and the flow connector 3, a plurality of liquid discharge holes 13 are formed on the third support block 11, and a traction wire 14 connected to the flow adjustment cylinder 4 after freely passing through one of the liquid discharge holes 13 and one of the liquid guide holes 10 on the corresponding first support block 6 and the corresponding second support block 7 is connected to the corresponding flow connector 3.
When the flow regulating cylinders 4 are rotated, the traction wires 14 in each spray head flow regulating assembly are wound or unwound through the flow regulating cylinders 4, the flow connectors 3 in the telescopic adjustable spray heads 2 slide along the axial directions of the corresponding movable cylinders 202 in cooperation with the telescopic regulation of the supporting springs 12, and the flow connectors 3 move in the corresponding movable cylinders 202 in the directions away from or close to the spray nozzles of the movable cylinders 202, so that the size of the spray nozzles of each telescopic adjustable spray head 2 is synchronously regulated to control the paint outlet flow of each telescopic adjustable spray head 2, and the paint outlet flow of each telescopic adjustable spray head 2 can be quickly and reasonably regulated according to paints with different concentrations, the thickness of paint needing to be sprayed on the inner wall of the plastic pipe 17, and the like; the plurality of liquid discharge holes 13 are designed to keep the inside of the telescopic adjustable nozzle 2 in a conducting state under the effect that the third supporting block 11 can be connected with the supporting spring 12.
The traction wires 14 pass through the liquid discharge holes 13 and the liquid guide holes 10 to reasonably layout the traction wires 14, and each traction wire 14 can be matched with a plurality of guide wheels, so that the installation and adjustment of the traction wires 14 are smooth and can not be blocked.
As shown in fig. 4, according to another embodiment of the present invention, the spray head structure for spraying paint on the inner wall of the plastic pipe further includes structural optimization of the flow connectors 3, each flow connector 3 adopted in the present invention is in a shape of a top, the small end of the flow connector 3 is close to the outer side of the nozzle end of the moving cylinder 202, a guiding assembly is disposed between the large end of the flow connector 3 and the inner wall of the corresponding moving cylinder 202, and the guiding assembly is used for linearly moving the flow connector 3 along the axial direction of the moving cylinder 202.
The flow connectors 3 are all designed to be in a gyro shape, the nozzle end structural design of each movable tube 202 is combined, the distance between the flow connectors 3 and the inner wall of the movable tube 202 is adjusted in the process of moving the flow connectors 3, so that the size of the nozzle of the telescopic adjustable spray head 2 is adjusted, and the spray flow of the spray head structure for spraying paint on the inner wall of the plastic tube is adjusted when the spray head structure for spraying paint on the inner wall of the plastic tube is used, so that the actual requirement is met.
And the guide component enables the movement adjustment of the flow connector 3 to be more stable.
Specifically, the guiding assembly that adopts all includes and is a plurality of guide structures that circumference direction was arranged at the inner wall of moving tube 202, and every guide structure all includes at the guide chute 15 that moves tube 202 inner wall and its axial direction offered and the joint piece of slip joint in guide chute 15, links to each other through elastic telescopic link 16 between joint piece and the big head end of flow connector 3.
The movement of the flow connector 3 is guided through the cooperation of the guide chute 15 and the clamping block, and the elastic telescopic rod 16 is used for carrying out telescopic adjustment due to the structural design of the flow connector 3 and the nozzle end of the moving cylinder 202, so that the flow connector 3 is prevented from being limited in the moving process.
In order to improve the sliding fit degree of the guide chute 15 and the clamping block, pulleys in sliding contact with the corresponding guide chute 15 are rotatably arranged at the bottom of the clamping block.
Finally, it is noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the technical solution of the present invention, which is intended to be covered by the scope of the claims of the present invention.
Claims (3)
1. The spray head structure for spraying paint on the inner wall of the plastic pipe is characterized by comprising a spray head connector with a hollow inside, wherein one end of the spray head connector is provided with a connecting port communicated with the inside of the spray head connector, a plurality of telescopic adjustable spray heads communicated with the inside of the spray head connector are uniformly distributed on the outer wall of the spray head connector along the circumferential direction of the spray head connector, and a flow connector is arranged in a spout of each telescopic adjustable spray head in a sliding manner along the axial direction of the spout of each telescopic adjustable spray head; the spray head connecting head is rotatably provided with an adjusting part penetrating the spray head connecting head, a spray head length adjusting component is connected between the part of the adjusting part arranged in the spray head connecting head and each telescopic adjustable spray head, and a spray head flow adjusting component is connected between the part of the adjusting part arranged in the spray head connecting head and each flow connecting head;
the adjusting part drives each nozzle length adjusting component in a rotating mode to drive each telescopic adjustable nozzle to synchronously adjust in a telescopic way; the adjusting part drives each nozzle flow adjusting component in a rotating mode to drive each flow connector to synchronously move along the axial direction of the corresponding telescopic adjustable nozzle so as to control the flow;
the adjusting part comprises a flow adjusting cylinder and a spray head adjusting shaft, the flow adjusting cylinder is freely arranged in the spray head connector in a penetrating way, is externally connected with threads, the spray head adjusting shaft is freely penetrated out of two ends of the flow adjusting cylinder and is connected with the threads, the end part of the flow adjusting cylinder in the spray head connector is connected with each spray head flow adjusting component, and the end part of the spray head adjusting shaft in the spray head connector is connected with each spray head length adjusting component;
each telescopic adjustable spray head comprises a fixed cylinder and a movable cylinder, one end of the movable cylinder is slidably connected in the fixed cylinder, one end of the fixed cylinder, which is far away from the movable cylinder, is fixedly connected and communicated with the spray head connector, one end of the movable cylinder, which is far away from the spray head connector, is in a nozzle shape, the spray head length adjusting assembly is arranged among the fixed cylinder, the movable cylinder and the spray head adjusting shaft, and the flow connector is arranged in the nozzle end of the corresponding movable cylinder;
each spray head length adjusting assembly comprises a first supporting block fixedly arranged on the inner wall of the liquid inlet end of the corresponding fixed cylinder and a second supporting block fixedly arranged on the inner wall of the liquid inlet end of the corresponding movable cylinder, a reset spring is connected between the first supporting block and the second supporting block, a traction rope is fixedly connected to the first supporting block, one end, far away from the first supporting block, of the traction rope freely penetrates into the spray head connector and then is wound on the spray head adjusting shaft for a plurality of circles to be fixed, and a plurality of liquid guide holes are formed in the first supporting block and the second supporting block;
each spray head flow regulating assembly comprises a third supporting block fixedly arranged on the inner wall of the liquid outlet end of the corresponding movable barrel and a supporting spring connected between the third supporting block and the corresponding flow connector, wherein the third supporting block is positioned between the liquid inlet end of the movable barrel and the flow connector, a plurality of liquid discharge holes are formed in the third supporting block, and a traction wire which freely penetrates through one liquid discharge hole and one liquid guide hole in the corresponding first supporting block and one liquid guide hole in the corresponding second supporting block and is connected with the flow regulating barrel is connected to the corresponding flow connector;
each traction wire can be provided with a plurality of guide wheels in a matched manner.
2. A spray head structure for spraying paint on the inner wall of a plastic pipe according to claim 1, wherein: every flow connector all is the top form, and the small end of flow connector is close to the outer side of the nozzle end of moving the section of thick bamboo, is provided with guide assembly between the big end of flow connector and the corresponding inner wall of moving the section of thick bamboo, and guide assembly is used for making flow connector follow and removes the linear movement of section of thick bamboo axial direction.
3. A spray head structure for spraying paint on the inner wall of a plastic pipe according to claim 2, wherein: the guide assembly comprises a plurality of guide structures which are circumferentially arranged on the inner wall of the movable barrel, each guide structure comprises a guide chute and a clamping block, the guide chute is formed in the inner wall of the movable barrel along the axial direction of the guide chute, the clamping block is slidably clamped in the guide chute, and the clamping block is connected with the big head end of the flow connector through an elastic telescopic rod.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110555180.XA CN113102150B (en) | 2021-05-21 | 2021-05-21 | Spray nozzle structure for spraying paint on inner wall of plastic pipe |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110555180.XA CN113102150B (en) | 2021-05-21 | 2021-05-21 | Spray nozzle structure for spraying paint on inner wall of plastic pipe |
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| CN113102150A CN113102150A (en) | 2021-07-13 |
| CN113102150B true CN113102150B (en) | 2023-07-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110555180.XA Active CN113102150B (en) | 2021-05-21 | 2021-05-21 | Spray nozzle structure for spraying paint on inner wall of plastic pipe |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115254499A (en) * | 2022-06-24 | 2022-11-01 | 安徽泫氏铸造有限责任公司 | Rust-proof spraying equipment for inner wall of nodular cast iron pipe |
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| CN212418368U (en) * | 2020-02-28 | 2021-01-29 | 深圳市中拓智森环保科技有限公司 | Remove formaldehyde medicament shower nozzle with adjustable |
| CN111760729A (en) * | 2020-06-29 | 2020-10-13 | 湖北省工业建筑集团安装工程有限公司 | Pipeline inner wall rust cleaning robot |
| CN111889281A (en) * | 2020-07-21 | 2020-11-06 | 开封新奥燃气有限公司 | Petrolatum spraying equipment for pipeline is anticorrosive |
| CN111921759A (en) * | 2020-08-27 | 2020-11-13 | 严高超 | Paint spraying device for inner wall of pipeline |
| CN214917422U (en) * | 2021-05-21 | 2021-11-30 | 宜昌四陵塑料制品有限责任公司 | Spray nozzle for spraying paint on inner wall of plastic pipe |
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