CN107971309A - Cleaning head for pipelines - Google Patents
Cleaning head for pipelines Download PDFInfo
- Publication number
- CN107971309A CN107971309A CN201810006940.XA CN201810006940A CN107971309A CN 107971309 A CN107971309 A CN 107971309A CN 201810006940 A CN201810006940 A CN 201810006940A CN 107971309 A CN107971309 A CN 107971309A
- Authority
- CN
- China
- Prior art keywords
- cleaning
- cleaning head
- piston rod
- axle
- gas circuit
- Prior art date
- 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.)
- Granted
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto
- B08B9/02—Cleaning pipes or tubes or systems of pipes or tubes
- B08B9/027—Cleaning the internal surfaces; Removal of blockages
- B08B9/032—Cleaning the internal surfaces; Removal of blockages by the mechanical action of a moving fluid, e.g. by flushing
- B08B9/0321—Cleaning the internal surfaces; Removal of blockages by the mechanical action of a moving fluid, e.g. by flushing using pressurised, pulsating or purging fluid
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto
- B08B9/02—Cleaning pipes or tubes or systems of pipes or tubes
- B08B9/027—Cleaning the internal surfaces; Removal of blockages
- B08B9/032—Cleaning the internal surfaces; Removal of blockages by the mechanical action of a moving fluid, e.g. by flushing
- B08B9/0321—Cleaning the internal surfaces; Removal of blockages by the mechanical action of a moving fluid, e.g. by flushing using pressurised, pulsating or purging fluid
- B08B9/0327—Cleaning the internal surfaces; Removal of blockages by the mechanical action of a moving fluid, e.g. by flushing using pressurised, pulsating or purging fluid the fluid being in the form of a mist
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto
- B08B9/02—Cleaning pipes or tubes or systems of pipes or tubes
- B08B9/027—Cleaning the internal surfaces; Removal of blockages
- B08B9/04—Cleaning the internal surfaces; Removal of blockages using cleaning devices introduced into and moved along the pipes
- B08B9/043—Cleaning the internal surfaces; Removal of blockages using cleaning devices introduced into and moved along the pipes moved by externally powered mechanical linkage, e.g. pushed or drawn through the pipes
- B08B9/0433—Cleaning the internal surfaces; Removal of blockages using cleaning devices introduced into and moved along the pipes moved by externally powered mechanical linkage, e.g. pushed or drawn through the pipes provided exclusively with fluid jets as cleaning tools
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto
- B08B9/02—Cleaning pipes or tubes or systems of pipes or tubes
- B08B9/027—Cleaning the internal surfaces; Removal of blockages
- B08B9/04—Cleaning the internal surfaces; Removal of blockages using cleaning devices introduced into and moved along the pipes
- B08B9/043—Cleaning the internal surfaces; Removal of blockages using cleaning devices introduced into and moved along the pipes moved by externally powered mechanical linkage, e.g. pushed or drawn through the pipes
- B08B9/0436—Cleaning the internal surfaces; Removal of blockages using cleaning devices introduced into and moved along the pipes moved by externally powered mechanical linkage, e.g. pushed or drawn through the pipes provided with mechanical cleaning tools, e.g. scrapers, with or without additional fluid jets
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Cleaning In General (AREA)
Abstract
The invention discloses a kind of cleaning head for pipelines, the Pneumatic reversal valve, threeway, reversing switch, the cylinder that are set in the driving body of drive division are connected with second group of gas circuit by first group of gas circuit, and connected by the through hole on piston rod side wall with centre bore；Piston rod outer end and the first axis connection of cleaning part, the centre bore of piston rod are connected with the jet passage of first axle, and nozzle is set in first axle, and first axle periphery is arranged roller brush；Pneumatic reversal valve is connected with the inlet channel of the second axis of supporting part.Cylinder is arranged in cleaning head for pipelines by the present invention using the gas liquid mixture of cleaning oil/liquid after being atomized as power source, using the reciprocating motion of the cylinder body of rod, makes piston rod drive round brush and nozzle to do straight reciprocating motion；Jet passage is opened up in piston rod inner, the gas liquid mixture of cleaning oil/liquid after atomization is sent into jet passage sprays from nozzle, and driving device and spraying and cleaning apparatus are dexterously combined into one, reach the effect scrubbed when back and forth spraying.
Description
Technical field
The present invention relates to pipeline cleanser field, especially a kind of cleaning head for pipelines.
Background technology
Pipeline is the device for conveying gas, liquid or solid-liquid mixture and other purposes.In using for pipeline
Inner-walls of duct can produce crystallization, dirt or remain conveying thing in journey, so that internal diameter of the pipeline is gradually reduced, influence pipeline just
Often use, the cleaning head of existing cleaning device often uses simple brush device, including hairbrush and hydro-peening head, recycles gear
Or fluid motor-driven traction brush device realizes reciprocal cleaning, existing tube cleaning arrangement volume is larger, heavier, Zhi Nengshi
For larger caliber, the pipeline of more pipe with small pipe diameter can only utilize or manually realize the effect back and forth cleaned, and manpower wipes time-consuming
Arduously, effect is poor, efficiency is low, in particular for the rough pipeline of special-shaped pipeline and this inside of cannon bore, due to
Hairbrush scouring force is limited, and thoroughly cleaning up needs to expend a large amount of clean waters and scavenging period, is driven using gear and motor traction
Dynamic mode also limit the flexibility ratio of cleaning head, can not clean up the dead angles such as groove or protrusion in pipeline.
The content of the invention
The cleaning head for pipelines that the applicant is directed in above-mentioned existing production is not used to the pipeline of pipe with small pipe diameter, for shape tube
Road cleaning is time-consuming and laborious, the problems such as can not thoroughly cleaning up, there is provided a kind of cleaning head for pipelines rational in infrastructure, front portion injection gas
Liquid mixture, carries out pressure wash, and cleans pipeline by the reciprocating motion of hairbrush, so as to preferably meet that pipe-line maintenance is maintained
Needs, extend the service life of pipeline.
The technical solution adopted in the present invention is as follows：
A kind of cleaning head for pipelines, the interior Pneumatic reversal valve set of driving body, threeway, reversing switch, the cylinder of drive division pass through
First group of gas circuit is connected with second group of gas circuit, and is connected by the through hole on piston rod side wall with centre bore；Piston rod outer end
With the first axis connection of cleaning part, the centre bore of piston rod is connected with the jet passage of first axle, and nozzle is set in first axle, the
One axis periphery is arranged roller brush；Pneumatic reversal valve is connected with the inlet channel of the second axis of supporting part.
Further as above-mentioned technical proposal is improved：
For the driving part between cleaning part and supporting part, the outside diameter of cleaning part and supporting part is all higher than drive division outside diameter.
First group of gas circuit and second group of gas circuit are connected with the first air inlet on cylinder and the second air inlet respectively.
First group of gas circuit is connected by threeway with the first air inlet.
Two groups of check valves are set in the cylinder, and the first air inlet and the second air inlet pass through check valve and perforation respectively
Hole connects.
Two side contacts of the piston rod after driving intrinsic one end to set block, block to slide with reversing switch,
And realize the gas circuit switching of the first air inlet and the second air inlet.
The connection that the piston rod outer end passes through quick change connecting portion and first axle.
Bearing is set between first axle and roller brush.
Support hairbrush is arranged on the second axis.
Check valve includes shuttle valve, Solenoid ball valve or balanced valve.
Beneficial effects of the present invention are as follows：The present invention using the gas liquid mixture of cleaning oil/liquid after being atomized as power source,
Cylinder is arranged in cleaning head for pipelines, using the reciprocating motion of the cylinder body of rod, makes piston rod drive round brush and nozzle to do straight line
Move back and forth, realize the reciprocal washing motion of cleaning head itself；It is of the invention by opening up jet passage in piston rod inner at the same time,
By the gas liquid mixture of cleaning oil/liquid after atomization by Pneumatic reversal valve, first group of gas circuit and second group of gas circuit convey into
Cylinder, then the check valve by being set in cylinder convey the jet passage into piston rod, are finally sprayed from nozzle, by driving device and
Spraying and cleaning apparatus is dexterously combined into one, and roller brush scrubs inner-walls of duct back and forth while nozzle sprays back and forth, and it is past to reach side
The effect of side scrub is sprayed again.When running into the convex position of special-shaped pipeline indent, round brush can adaptive intra shape passively rotate, it is right
Pipeline carry out it is comprehensive, without dead angle quick wipe, will not both injure tube wall, also angle cleaning is cleaner so that concavo-convex position is waited for death.
The driving bulk volume of the present invention is small, light-weight, and can design different rulers according to the diameter of pipeline to be cleaned, length adjustment
It is very little, it is widely used in random length, the pipeline cleaning of more than internal diameter 70mm.The present invention can be used for the pole of minus 20 degrees ~ 80 degree
End ring border, the scope of application are wider.The present invention is substantially increased cleaning efficiency, is contracted using cleaning oil/liquid Cleaning pipes after atomization
Short scavenging period, in addition to it can complete cleaning, moreover it is possible to atomization antirust is done to inner-walls of duct.The nozzle of the present invention and the portion of roller brush
Point can quick change, to adapt to the cleaning of different size of special-shaped pipeline, high-pressure installation can also be installed in cleaning part, carry out high
Pressure spray.
Brief description of the drawings
Fig. 1 is the structure diagram of the present invention.
In figure：1st, nozzle；2nd, bearing；3rd, roller brush；4th, first axle；5th, quick change connecting portion；6th, centre bore；7th, piston rod；8、
Cylinder；9th, through hole；10th, check valve；11st, the first air inlet；12nd, threeway；13rd, jet passage；14th, Pneumatic reversal valve；15th, change
To switch；16th, block；17th, guide rail；18th, body is driven；19th, hairbrush is supported；20th, inlet channel；21st, first group of gas circuit；22、
Second group of gas circuit；23rd, the second air inlet；24th, the second axis.
Embodiment
Below in conjunction with the accompanying drawings, the embodiment of the present invention is illustrated.
As shown in Figure 1, cleaning head for pipelines of the present invention sets gradually cleaning part, drive division and support from left to right
Portion, the second axis 24 of the first axle 4 of cleaning part, the piston rod 7 of drive division and supporting part is located on same central axis, first
Axis 4,7 and second axis 24 of piston rod central axis on open up jet passage 13, centre bore 6 and inlet channel 20 respectively.
4 outer end of first axle is connected by quick change connecting portion 5 with piston rod 7, centre bore 6 and the jet passage 13 of piston rod 7
Connection, other end activity set nozzle 1, and the inside of nozzle 1 is connected with jet passage 13, and nozzle 1 is metal material, and periphery is uniformly distributed
Open up 4 ~ 8 holes.The middle part of first axle 4 sets bearing 2, and roller brush 3 is sleeved on bearing 2, and 3 diameter of roller brush is slightly larger than pipeline to be cleaned
The part of internal diameter, nozzle 1 and roller brush 3 can be with quick change, can also be in cleaning part to adapt to the cleaning of different size of special-shaped pipeline
High-pressure nozzle is installed, carries out high-pressure spraying.
The driving body 18 of drive division is a cylinder, and left side sets cylinder 8, the piston rod 7 of cylinder 8 in driving body 18
Right-hand end fixes a block 16, and reversing switch 15 is arranged in driving body 18, and guide rail 17, gear are set on reversing switch 15
Block 16 slides on guide rail 17, and block 16 is used for spacing and position monitoring.Pneumatic reversal valve 14 is also disposed at driving body 18
Inside, Pneumatic reversal valve 14 are connected by 15 two ends of first group of gas circuit 21 and second group of gas circuit 22 and reversing switch, and first
Group gas circuit 21 is connected by threeway 12 with the first air inlet 11, and second group of gas circuit 22 is connected with the second air inlet 23, in cylinder 8
Two groups of check valves 10 are set, it is corresponding with check valve 10 that two groups of through holes 9, the first air inlet 11 are opened up on the side wall of piston rod 7
It is connected respectively by check valve 10 with the through hole 9 on piston rod 7 with the second air inlet 23, by gas liquid mixture from through hole
9 are sent into the centre bore 6 inside piston rod 7.
Support hairbrush 19 is arranged on second axis 24, end of second axis 24 in driving body 18 is changed by gas circuit and gas control
Connected to valve 14, and inlet channel 20 connects therewith, the diameter of roller brush 3 and support hairbrush 19 is more than the diameter of driving body 18,
Both are supported on inner-walls of duct, can prevent driving body 18 from contacting friction scratch tube wall with inner-walls of duct, support hairbrush 19
The periphery of driving body 18 can be arranged on, can equally achieve the purpose that support driving body 18.
The driving body 18 of the cleaning head for pipelines of the present invention is small, light-weight, and can be according to the straight of pipeline to be cleaned
Footpath, length adjustment design different sizes, are widely used in random length, the pipeline cleaning of more than internal diameter 70mm.The present invention's
Reversing switch 15 uses contact-making switch, can also use microswitch, travel switch, tongue tube or hall sensing element.This hair
Bright check valve 10 can also be shuttle valve, Solenoid ball valve or balanced valve.
The present invention work when, cleaning head for pipelines delivers into pipeline to be cleaned through pipeline cleaning conveyer, will cleaning oil/
Liquid is atomized, and the gas liquid mixture after atomization enters from inlet channel 20, is commutated by gas circuit in communication into gas control
Valve 14, first group of gas circuit 21 are opened, and gas liquid mixture is by the threeway 12 that is connected with first group of gas circuit 21, from the first air inlet 11
Into cylinder 8, promote piston rod 7 to move, while enter the centre bore 6 of piston rod 7 from through hole 9 by check valve 10, at this time
The check valve 10 connected with the second air inlet 23 is closed, so gas circuit will not be returned from the second air inlet 23, piston rod 7 drives gear
Block 16 is moved to the left until contact reversing switch 15, first group of gas circuit 21 are closed, and second group of gas circuit 22 is opened, and gas liquid mixture leads to
Cross and enter cylinder 8 from the second air inlet 23 with second group of gas circuit 22, promote 7 counter motion of piston rod, while pass through check valve 10
Enter the centre bore 6 of piston rod 7 from through hole 9, the check valve 10 connected at this time with the first air inlet 11 is closed, so gas circuit
It will not be returned from the first air inlet 11, piston rod 7 drives block 16 to move right until contact reversing switch 15, second group of gas circuit
22 close, and first group of gas circuit 21 is opened, and piston rod 7 so drives roller brush 3 and nozzle 1 to do straight reciprocating motion repeatedly, and gas-liquid is mixed
After zoarium enters the centre bore 6 of piston rod 7, the jet passage 13 of first axle 4 is entered from the quick change connecting portion 5 in left side, finally from
Perforate on nozzle 1 sprays, and spray piping inner wall is lubricated, cleans and scarfing cinder nozzle 1 back and forth, and roller brush 3 is matched, back and forth
Inner-walls of duct is scrubbed, reaches the effect scrubbed when back and forth spraying, runs into the convex position of special-shaped pipeline indent, roller brush 3 is adaptive
Interior shape passively rotates, pipeline is carried out it is comprehensive, without dead angle quick wipe, tube wall will not be both injured, also so that jog
Position cleaning is cleaner.Cleaning oil/liquid after atomization is sent into first axle 4 by the present invention by the piston rod 7 of cylinder 8, finally by a left side
The nozzle 1 of side is sprayed to multiple directions, using cleaning oil/liquid Cleaning pipes after atomization, substantially increases cleaning efficiency, is shortened
Scavenging period, reduces the loss of cleaning oil/liquid, in addition to it can complete cleaning, moreover it is possible to atomization antirust is done to inner-walls of duct.
Above description is explanation of the invention, is not the restriction to invention, without departing from the spirit of the invention,
The present invention can make any type of modification.Reversing switch 15 and block 16 can also be installed on other positions in driving body 18
Put, as long as can realize spacing when piston rod 7 moves back and forth.Nozzle 1 can also be arranged on the right side of roller brush 3, equally
It can realize the effect scrubbed in spray.
Claims (10)
- A kind of 1. cleaning head for pipelines, it is characterised in that：The driving body of drive division（18）The Pneumatic reversal valve of interior setting（14）, three It is logical（12）, reversing switch（15）, cylinder（8）Pass through first group of gas circuit（21）With second group of gas circuit（22）Connection, and pass through piston Bar（7）Through hole on side wall（9）With centre bore（6）Connection；Piston rod（7）Outer end and the first axle of cleaning part（4）Connection, it is living Stopper rod（7）Centre bore（6）With first axle（4）Jet passage（13）Connection, first axle（4）Upper setting nozzle（1）, first axle （4）Periphery is arranged roller brush（3）；Pneumatic reversal valve（14）With the second axis of supporting part（24）Inlet channel（20）Connection.
- 2. cleaning head for pipelines described in accordance with the claim 1, it is characterised in that：The driving part in cleaning part and supporting part it Between, the outside diameter of cleaning part and supporting part is all higher than drive division outside diameter.
- 3. cleaning head for pipelines described in accordance with the claim 1, it is characterised in that：First group of gas circuit（21）With second group of gas circuit （22）Respectively with cylinder（8）On the first air inlet（11）With the second air inlet（23）Connection.
- 4. cleaning head for pipelines described in accordance with the claim 3, it is characterised in that：First group of gas circuit（21）Pass through threeway（12） With the first air inlet（11）Connection.
- 5. cleaning head for pipelines described in accordance with the claim 1, it is characterised in that：In the cylinder（8）Two groups of check valves of interior setting （10）, the first air inlet（11）With the second air inlet（23）Pass through check valve respectively（10）With through hole（9）Connection.
- 6. cleaning head for pipelines described in accordance with the claim 1, it is characterised in that：The piston rod（7）In driving body（18）It is interior One end set block（16）, block（16）After slip with reversing switch（15）Two side contacts, and realize the first air inlet （11）With the second air inlet（23）Gas circuit switching.
- 7. cleaning head for pipelines described in accordance with the claim 1, it is characterised in that：The piston rod（7）Outer end is connected by quick change Portion（5）With first axle（4）Connection.
- 8. cleaning head for pipelines described in accordance with the claim 1, it is characterised in that：In first axle（4）With roller brush（3）Between axis is set Hold（2）.
- 9. cleaning head for pipelines described in accordance with the claim 1, it is characterised in that：In the second axis（24）On be arranged support hairbrush （19）.
- 10. according to the cleaning head for pipelines described in claim 5, it is characterised in that：Check valve（10）Including shuttle valve, Solenoid ball valve or Person's balanced valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810006940.XA CN107971309B (en) | 2018-01-04 | 2018-01-04 | Pipeline cleaning head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810006940.XA CN107971309B (en) | 2018-01-04 | 2018-01-04 | Pipeline cleaning head |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107971309A true CN107971309A (en) | 2018-05-01 |
| CN107971309B CN107971309B (en) | 2023-08-18 |
Family
ID=62005827
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810006940.XA Active CN107971309B (en) | 2018-01-04 | 2018-01-04 | Pipeline cleaning head |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107971309B (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107504926A (en) * | 2017-08-15 | 2017-12-22 | 厦门海纳德科技有限公司 | A kind of pipeline incrustation thickness detecting probe and pipeline cleaning method |
| CN108580457A (en) * | 2018-05-17 | 2018-09-28 | 宁波智果科技咨询服务有限公司 | A kind of cleaning device for inner wall of pipeline with self-cleaning function |
| CN112471701A (en) * | 2020-11-26 | 2021-03-12 | 胡文杰 | Gluing machine for shoemaking |
| CN112845424A (en) * | 2020-12-18 | 2021-05-28 | 邢万里 | PVC pipe inner wall cleaning head, cleaning system and cleaning method |
| CN114322647A (en) * | 2021-12-17 | 2022-04-12 | 合肥君信电子科技有限公司 | Portable automatic chamber wiping machine for cleaning inner wall of bore |
| CN114345958A (en) * | 2021-12-31 | 2022-04-15 | 浙江精瑞工模具有限公司 | Spray head of water descaling box |
| CN117600186A (en) * | 2024-01-23 | 2024-02-27 | 成都理工大学 | Pipeline dredging robot |
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| CN2639554Y (en) * | 2003-05-09 | 2004-09-08 | 刘长年 | Electrohydraulic high-pressure plunger pump |
| CN101776102A (en) * | 2010-01-08 | 2010-07-14 | 烟台未来自动装备有限责任公司 | Micro automatic reciprocating air cylinder |
| JP2012021667A (en) * | 2010-07-12 | 2012-02-02 | Fuji Seisakusho:Kk | Gun barrel cleaning method and gun barrel cleaning device |
| CN102357491A (en) * | 2011-10-21 | 2012-02-22 | 河南航天工业总公司 | Machine for wiping inner walls of gun barrel or other pipelines |
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| CN107497797A (en) * | 2017-09-05 | 2017-12-22 | 上海神洲阳光特种钢管有限公司 | A kind of steel pipe inner wall cleaning equipment and method |
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| CN2639554Y (en) * | 2003-05-09 | 2004-09-08 | 刘长年 | Electrohydraulic high-pressure plunger pump |
| CN101776102A (en) * | 2010-01-08 | 2010-07-14 | 烟台未来自动装备有限责任公司 | Micro automatic reciprocating air cylinder |
| JP2012021667A (en) * | 2010-07-12 | 2012-02-02 | Fuji Seisakusho:Kk | Gun barrel cleaning method and gun barrel cleaning device |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107504926A (en) * | 2017-08-15 | 2017-12-22 | 厦门海纳德科技有限公司 | A kind of pipeline incrustation thickness detecting probe and pipeline cleaning method |
| CN108580457A (en) * | 2018-05-17 | 2018-09-28 | 宁波智果科技咨询服务有限公司 | A kind of cleaning device for inner wall of pipeline with self-cleaning function |
| CN112471701A (en) * | 2020-11-26 | 2021-03-12 | 胡文杰 | Gluing machine for shoemaking |
| CN112471701B (en) * | 2020-11-26 | 2021-12-21 | 湖南日虹科技有限公司 | Gluing machine for shoemaking |
| CN112845424A (en) * | 2020-12-18 | 2021-05-28 | 邢万里 | PVC pipe inner wall cleaning head, cleaning system and cleaning method |
| CN114322647A (en) * | 2021-12-17 | 2022-04-12 | 合肥君信电子科技有限公司 | Portable automatic chamber wiping machine for cleaning inner wall of bore |
| CN114345958A (en) * | 2021-12-31 | 2022-04-15 | 浙江精瑞工模具有限公司 | Spray head of water descaling box |
| CN114345958B (en) * | 2021-12-31 | 2023-12-08 | 浙江精瑞工模具有限公司 | Water descaling box shower nozzle |
| CN117600186A (en) * | 2024-01-23 | 2024-02-27 | 成都理工大学 | Pipeline dredging robot |
| CN117600186B (en) * | 2024-01-23 | 2024-05-03 | 成都理工大学 | Pipeline dredging robot |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107971309B (en) | 2023-08-18 |
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