CN109571176A - Grinding device based on pipe fitting connector - Google Patents
Grinding device based on pipe fitting connector Download PDFInfo
- Publication number
- CN109571176A CN109571176A CN201811647227.XA CN201811647227A CN109571176A CN 109571176 A CN109571176 A CN 109571176A CN 201811647227 A CN201811647227 A CN 201811647227A CN 109571176 A CN109571176 A CN 109571176A
- Authority
- CN
- China
- Prior art keywords
- pipe fitting
- cloth cover
- connecting rod
- grinding device
- rod
- 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
- 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
- B24B9/00—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor
- B24B9/007—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor for end faces of tubes
-
- 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
- B24B27/00—Other grinding machines or devices
- B24B27/0076—Other grinding machines or devices grinding machines comprising two or more grinding tools
-
- 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
- B24B41/00—Component parts such as frames, beds, carriages, headstocks
- B24B41/02—Frames; Beds; Carriages
-
- 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
- B24B41/00—Component parts such as frames, beds, carriages, headstocks
- B24B41/06—Work supports, e.g. adjustable steadies
- B24B41/067—Work supports, e.g. adjustable steadies radially supporting workpieces
-
- 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
- B24B5/00—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor
- B24B5/36—Single-purpose machines or devices
- B24B5/40—Single-purpose machines or devices for grinding tubes internally
-
- 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
- B24B55/00—Safety devices for grinding or polishing machines; Accessories fitted to grinding or polishing machines for keeping tools or parts of the machine in good working condition
- B24B55/06—Dust extraction equipment on grinding or polishing machines
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Grinding Of Cylindrical And Plane Surfaces (AREA)
Abstract
The present invention relates to vehicle frame processing technique fields, are based especially on the grinding device of pipe fitting connector, including rack, and rotation is provided with drive rod in rack, and telescope support group is equipped on drive rod；Telescope support group includes the connecting rod being in the same plane and two support rods, and two support rods are articulated on drive rod, and connecting rod is articulated with the free end of two support rods；The free end of support rod is fixedly connected to clump weight；The scraper for pipe fitting inner wall of polishing is fixedly connected in connecting rod.This programme is small in line up bore and pipe fitting that tube body diameter is big carries out the polishing of internal wall of pipe orifice and pipe shaft inner wall, avoid occurring the polishing of the corner of internal wall of pipe orifice to pipe shaft inner wall less than.
Description
Technical field
The present invention relates to vehicle frame processing technique fields, and in particular to the grinding device based on pipe fitting connector.
Background technique
When manufacturing motorcycle battery bag support, it usually needs the welding for carrying out steel pipe and steel pipe, when welded still pipe, such as
The nozzle of fruit steel pipe or internal wall of pipe orifice out-of-flatness, the time that when Frame Welding is expended is longer, can also be easy to send out after Frame Welding
It situations such as raw fracture, uses and is absolutely unsafe.
It is now in the factory usually that worker holds the polishing that sanding block carries out internal wall of pipe orifice, but such manual type is usual
Compare and expend the time, working efficiency is low.And the nozzle bore of this kind of pipe fitting is usually smaller, it is more difficult that sanding block probes into, need to be to it
It when inner wall is polished, is then difficult to realize, grinding effect is bad, polishes not in place, brings big inconvenience to production and processing.
Summary of the invention
The purpose of the present invention is to provide the grinding device based on pipe fitting connector, the small pipe of the nozzle bore that can be probeed into
Part, line up inner wall are polished, and working efficiency is improved.
In order to achieve the above objectives, the base case that technical solution of the present invention provides are as follows:
Based on the grinding device of pipe fitting connector, including rack, rotation is provided with drive rod in rack, installs on drive rod
There is telescope support group；Telescope support group includes the connecting rod being in the same plane and two support rods, and two support rods are hinged
In on drive rod, connecting rod is articulated with the free end of two support rods；The free end of support rod is fixedly connected to clump weight；Even
The scraper for pipe fitting inner wall of polishing is fixedly connected on extension bar.
This programme has the technical effect that
1, setting drive rod rotation is mounted on the rack, and telescope support group is equipped on drive rod, and drive rod rotation drives
Telescope support group is rotated.Two support rods are articulated on drive rod, and connecting rod is articulated with the free end of two support rods, even
The scraper for pipe fitting inner wall of polishing is fixedly connected on extension bar.When drive rod rotation drive come two support rods rotated,
Make support rod drive connecting rod far from drive rod and close to pipe fitting inner wall, probes into drive rod after pipe fitting inner wall again with scraper
The polishing that expansion carries out pipe fitting inner wall is carried out, avoids pipe diameter smaller, man-hour manually hand-held grinding device is polished uneven after probeing into
The case where, it improves work efficiency.
2, the free end that support rod is arranged is fixedly connected to clump weight, and when support rod rotates, clump weight increases support rod
The centrifugal force of free end when support rod being made to prop up connecting rod, stable is mutually perpendicular between support rod and drive rod in one
State, avoid connecting rod because of the frictional force by pipe fitting inner wall and scraper in polishing, and move connecting rod towards drive rod.
Using the technical program, drive rod and the telescope support group on drive rod in contraction state are probeed into pipe together
Inside part, drive rod is rotated, due to the gravity of telescope support group itself, telescope support group is thrown away outward because of centrifugal force；Flexible branch
Clump weight in frame group throws telescope support group outward away by bigger centrifugal force, be in entire telescope support group can
One stable open configuration.The scraper in the connecting rod in telescope support group polishes to pipe fitting inner wall at this time, polishes
Since clump weight increases the centrifugal force of telescope support group in journey, then telescope support group will not bounce back.Whole process is automatic
Change, device can probe into inside pipe fitting and carry out pipe fitting inner wall polishing, be not necessarily to manual polishing, improve work efficiency, polish more
Uniformly.
Further, scraper is the blade of two panels arc, and the cardinal extremity of two blades is fixedly connected, the free end of two blades
As arcwall face is located remotely from each other.
The blade that scraper is two panels arc is set, makes telescope support group during rotation, two blades can be to pipe fitting
Inner wall is polished, and the efficiency of polishing is increased.The cardinal extremity of two blades is fixedly connected, and the free end of two blades is with arcwall face
Be located remotely from each other, two blades are towards different directions, and setting makes inner wall polish more uniform in this way, polishing it is more efficient.
Further, at least three telescope support groups, adjacent two flexible branch are evenly distributed in the circumferential direction of drive rod
Connecting rod in frame group is fixedly connected by the first cloth cover；The side that first cloth cover is connect with connecting rod, which is provided with, to be passed through
The opening of polishing bits；It is fixedly connected between support rod in two adjacent expansion bracket groups by the second cloth cover, the first cloth
Face and the second cloth cover form collecting chamber.
It is arranged in the circumferential direction of drive rod and is evenly distributed at least three telescope support groups, in two neighboring telescope support group
Connecting rod is fixedly connected by the first cloth cover, so that all connecting rods are formed the parcel-like of a circumferential direction to drive rod
State.The side that first cloth cover is connect with connecting rod is provided with can be by the opening of polishing bits；In two adjacent expansion bracket groups
It is fixedly connected between support rod by the second cloth cover, the first cloth cover and the second cloth cover form collecting chamber.It polishes and considers to be worth doing when polishing
Collecting chamber can be entered by opening, so that polishing in bruting process is considered to be worth doing can be collected, avoid the blocking of polishing bits in the tube and
Subsequent processing is influenced to use.
Further, the first cloth cover is located on the inside of collecting chamber is provided at least one block of magnetite on one side.
First cloth cover is set it is located on the inside of collecting chamber and be provided at least one block of magnetite on one side, polishing bits enters in collecting chamber
After can receive centrifugal force effect and get rid of outward, at this time the first cloth cover be equipped with magnetite, polishing bits is adsorbed by magneticaction at this time
On magnetite, polishing bits is avoided to fall out of collecting chamber.
Further, the second cloth cover is located on the outside of collecting chamber is provided with the sponge being overlapped with the second cloth cover on one side.
The second cloth cover is arranged is located on the outside of collecting chamber has a sponge being overlapped with the second cloth cover on one side, when polishing, sponge energy
Enough absorption polishing bits, avoid tiny polishing from considering to be worth doing and are adhered to pipe fitting inner wall.
Further, the face that sponge contacts with pipe fitting inner wall is provided at least one and collects hole.
The face that sponge contacts with pipe fitting inner wall is set and is provided at least one collection hole, when sponge and pipe fitting inner wall contact,
The space that sponge collects polishing bits can be increased by collecting hole, and sponge is made to collect more polishing bits, polishing bits can enter collect hole it
After enter back into inside sponge.
Further, sliding rail is provided in rack, drive rod is slideably positioned in rack.
Have sliding rail in setting rack, drive rod is slideably positioned in rack, enable drive rod on the rack towards probeing into or
The direction for being detached from inside pipe fitting is moved, and is avoided and is needed to be aligned in nozzle repeatedly when man-hour manually hand-held device is probeed into
Spent by wall the case where the plenty of time.
Detailed description of the invention
Fig. 1 is that the present invention is based on the main views of the grinding device of pipe fitting connector；
Fig. 2 is the structural schematic diagram of telescope support group in Fig. 1.
Specific embodiment
It is further described below by specific embodiment:
Appended drawing reference in Figure of description includes: rack 1, sliding rail 2, fixture 3, pipe fitting 4, fixed link 5, motor 6, transmission
Bar 7, telescope support group 9, connecting rod 10, support rod 11, opening 12, scraper 13, sponge 14, collects hole 15, the at second cloth cover 8
One cloth cover 16.
Embodiment is substantially as shown shown in Figure 1 and Figure 2:
As shown in Figure 1, the grinding device based on pipe fitting connector, including the electricity set gradually from left to right in rack 1
Machine 6, telescope support group 9 and fixture 3 are equipped with the sliding rail 2 that can be horizontally slipped in rack 1, and the lower end of fixture 3 is welded on rack 1
Upper fixture 3 is located along the same line with sliding rail 2.The left side upper surface of sliding rail 2 is welded with fixed link 5, the upper end welding of fixed link 5
There is motor 6, the output shaft of motor 6 is connected with the left end of drive rod 7 by shaft coupling.
As shown in Fig. 2, being uniformly distributed four telescope support groups 9 in the circumferential direction of drive rod 7, telescope support group 9 includes position
In connecting rod 10 and two support rods 11 in same plane, the axis of two support rods 11 can hang down with the axis of drive rod 7
Directly.One end of two support rods 11 passes through bolt hinge when on drive rod 7, making telescope support group 9 be in contraction state, branch
Strut 11 is drawn close along the radial direction rotation of drive rod 7；The left and right ends of connecting rod 10 pass through bolt and are hinged on two supports
Between the other end of bar 11, the axis of bolt is arranged in parallel.
Support rod 11 is welded with clump weight (being not drawn into figure) in that one end close to connecting rod 10.Connecting rod 10 is welded
There is scraper 13, scraper 13 includes the blade of two arcs, and one end of two blades is mutually welded and is welded in connecting rod 10, scraper
13 length and the equal length of connecting rod 10.The other end of blade is located remotely from each other, and entire scraper 13 is in the figure of three.
As shown in Fig. 2, the first cloth cover 16 is adhesive between connecting rod 10 and adjacent connecting rod 10, the length of the first cloth cover 16
It is equal with connecting rod 10.It is adhesive with the second cloth cover 8 between support rod 11 and the support rod 11 of adjacent expansion bracket group 9, first
All telescope support groups 9 connect with the second cloth cover 8 and form a cuboid by cloth cover 16, and the inside of cuboid is to have drive rod 7
Collecting chamber across its axle center.
Position corresponding with scraper 13 is provided with opening 12 on first cloth cover 16, be open 12 length it is longer than scraper 13
Spend short 5cm, be open 12 width it is identical as the blade radius of scraper 13；First cloth cover 16 is towards pasting in the one side of collecting chamber
Two pieces of magnetites (being not drawn into figure, particular number is adjusted according to user's service condition).It has been pasted on second cloth cover 8 and
The identical sponge 14 of two cloth covers, 8 shape, the side of sponge 14 is provided with five collection holes 15, and (particular number is used according to user
Situation adjustment).
Specific implementation process is as follows:
A, it probes into and pipe fitting of polishing
Pipe fitting 4 is placed in fixture 3, fixture 3 is made to clamp pipe fitting 4.Sliding rail 2 is pushed to the right, and fixed link 5 is made to drive transmission
Bar 7 slides to the right, and then drive rod 7 is probeed into inside pipe fitting 4, and telescope support group 9 is in contraction state at this time, and connecting rod 10 is pasted
It is bordering on drive rod 7.
Motor 6 is opened, makes motor 6 that drive rod 7 be driven to be rotated, due to the gravity of support rod 11 and connecting rod 10 itself
In addition the gravity of clump weight, drive rod 7 then drives support rod 11 and connecting rod to carry out centrifugal movement when rotation, makes telescope support
Group 9 is in extended state, and connecting rod 10 is gradually far from drive rod 7.As shown in Fig. 2, until between support rod 11 and drive rod 7
In orthogonal state, telescope support group 9 is in stable state.
Connecting rod 10 is supported bar 11 and props up, and contact the scraper 13 in connecting rod 10 can with 4 inner wall of pipe fitting, rotary state
Middle connecting rod 10 drives scraper 13 to carry out polishing and scraping to 4 inner wall of pipe fitting, and by adjusting the position of sliding rail 2, scraper 13 can be right
The different location of 4 inner wall of pipe fitting is polished.
B, polishing bits are collected
In bruting process, blade constantly carries out scraping, shovels lower polishing bits, polishing bits along scraping blade cambered surface from the first cloth cover
Opening 12 on 16 enters in collecting chamber.Polishing bits are slipped on the first cloth cover 16 at this time, and by the magnetic on the first cloth cover 16
Stone adsorbs, and prevents polishing bits from sliding away again from opening 12.
Meanwhile the side of the second sponge 14 on cloth cover 8 can rub to 4 inner wall of pipe fitting, will glue in 4 inner wall of pipe fitting
The tiny polishing bits in attached part are wiped, and are considered tiny polishing to be worth doing and be collected by the collection hole 15 of 14 side of sponge
In the tiny hole of sponge 14, that is, complete the collection of polishing bits.The polishing generated in bruting process bits are avoided to be blocked in this kind of pipe
It is difficult to fall off and remove in mouthful lesser pipe fitting 4, polishing while carries out the collection of polishing bits, improves the efficiency of work.
Claims (7)
1. based on the grinding device of pipe fitting connector, including rack, it is characterised in that: rotation is provided with transmission in the rack
Bar is equipped with telescope support group on drive rod；The telescope support group includes the connecting rod being in the same plane and two branch
Strut, two support rods are articulated on drive rod, and the connecting rod is articulated with the free end of two support rods；The support rod
Free end is fixedly connected to clump weight；The scraper for pipe fitting inner wall of polishing is fixedly connected in the connecting rod.
2. the grinding device according to claim 1 based on pipe fitting connector, it is characterised in that: the scraper is two panels arc
The cardinal extremity of the blade of shape, two blades is fixedly connected, and the free ends of two blades is located remotely from each other with arcwall face.
3. the grinding device according to claim 1 based on pipe fitting connector, it is characterised in that: the circumferential direction of the drive rod
On be evenly distributed at least three telescope support groups, the connecting rod in two adjacent telescope support groups pass through the first cloth cover carry out
It is fixedly connected；The side that first cloth cover is connect with connecting rod is provided with can be by the opening of polishing bits；Two adjacent expansions
It is fixedly connected between support rod in bracket group by the second cloth cover, first cloth cover and the second cloth cover are formed and collected
Chamber.
4. the grinding device according to claim 3 based on pipe fitting connector, it is characterised in that: first cloth cover is located at
It is provided at least one block of magnetite on one side on the inside of collecting chamber.
5. the grinding device according to claim 3 based on pipe fitting connector, it is characterised in that: second cloth cover is located at
It is provided with the sponge being overlapped with the second cloth cover on one side on the outside of collecting chamber.
6. the grinding device according to claim 5 based on pipe fitting connector, it is characterised in that: in the sponge and pipe fitting
The face of wall contact is provided at least one and collects hole.
7. the grinding device according to claim 1 based on pipe fitting connector, it is characterised in that: be provided in the rack
Sliding rail, the drive rod are slideably positioned in rack.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811647227.XA CN109571176B (en) | 2018-12-29 | 2018-12-29 | Grinding device based on pipe fitting connector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811647227.XA CN109571176B (en) | 2018-12-29 | 2018-12-29 | Grinding device based on pipe fitting connector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109571176A true CN109571176A (en) | 2019-04-05 |
| CN109571176B CN109571176B (en) | 2020-04-07 |
Family
ID=65914953
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811647227.XA Active CN109571176B (en) | 2018-12-29 | 2018-12-29 | Grinding device based on pipe fitting connector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109571176B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110899163A (en) * | 2019-12-13 | 2020-03-24 | 安徽信息工程学院 | Heating pipeline interface grinding device |
| CN111070516A (en) * | 2019-11-27 | 2020-04-28 | 林秀珍 | Full-automatic mechanical deburring equipment |
| CN111376120A (en) * | 2020-04-29 | 2020-07-07 | 江苏寅昊智能装备有限公司 | Pipeline centre gripping grinding device |
| CN111872772A (en) * | 2020-07-27 | 2020-11-03 | 彭琦 | Processing method of PVC (polyvinyl chloride) pipe |
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|---|---|---|---|---|
| JPH1190798A (en) * | 1997-09-18 | 1999-04-06 | Mitsubishi Heavy Ind Ltd | Pipe inside diameter grinding device |
| CN104816209A (en) * | 2015-05-21 | 2015-08-05 | 苏州欢颜电气有限公司 | Telescoping inner wall sanding device |
| CN104827362A (en) * | 2015-06-03 | 2015-08-12 | 铜陵市永生机电制造有限责任公司 | Deburring device for inner hole opening of pipe |
| CN106078375A (en) * | 2016-08-11 | 2016-11-09 | 朱政 | Waste and old lining inner surface of tubes with plastics layer automatic grinding cleaning plant |
| CN206169861U (en) * | 2016-10-21 | 2017-05-17 | 山东明航智能物流装备股份有限公司 | Inner wall of circular pipe burnishing machine |
| CN206883371U (en) * | 2017-06-13 | 2018-01-16 | 广州万为石化科技有限公司 | A kind of centrifugal adjustable metal polishing structure |
| CN108058070A (en) * | 2017-11-30 | 2018-05-22 | 宁波江北珂达汽车技术有限公司 | Casting processing unit |
| CN207507935U (en) * | 2017-10-14 | 2018-06-19 | 山东科技大学 | A kind of electronic thermos flask cleaner of retractable |
| CN108326646A (en) * | 2018-04-26 | 2018-07-27 | 何天行 | A kind of synchronous high-efficiency cleaning shaft inner wall arrangement for grinding |
| CN208034291U (en) * | 2018-02-12 | 2018-11-02 | 唐山钢铁集团有限责任公司 | A kind of roller cold type inner wall cleaning device |
-
2018
- 2018-12-29 CN CN201811647227.XA patent/CN109571176B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1190798A (en) * | 1997-09-18 | 1999-04-06 | Mitsubishi Heavy Ind Ltd | Pipe inside diameter grinding device |
| CN104816209A (en) * | 2015-05-21 | 2015-08-05 | 苏州欢颜电气有限公司 | Telescoping inner wall sanding device |
| CN104827362A (en) * | 2015-06-03 | 2015-08-12 | 铜陵市永生机电制造有限责任公司 | Deburring device for inner hole opening of pipe |
| CN106078375A (en) * | 2016-08-11 | 2016-11-09 | 朱政 | Waste and old lining inner surface of tubes with plastics layer automatic grinding cleaning plant |
| CN206169861U (en) * | 2016-10-21 | 2017-05-17 | 山东明航智能物流装备股份有限公司 | Inner wall of circular pipe burnishing machine |
| CN206883371U (en) * | 2017-06-13 | 2018-01-16 | 广州万为石化科技有限公司 | A kind of centrifugal adjustable metal polishing structure |
| CN207507935U (en) * | 2017-10-14 | 2018-06-19 | 山东科技大学 | A kind of electronic thermos flask cleaner of retractable |
| CN108058070A (en) * | 2017-11-30 | 2018-05-22 | 宁波江北珂达汽车技术有限公司 | Casting processing unit |
| CN208034291U (en) * | 2018-02-12 | 2018-11-02 | 唐山钢铁集团有限责任公司 | A kind of roller cold type inner wall cleaning device |
| CN108326646A (en) * | 2018-04-26 | 2018-07-27 | 何天行 | A kind of synchronous high-efficiency cleaning shaft inner wall arrangement for grinding |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111070516A (en) * | 2019-11-27 | 2020-04-28 | 林秀珍 | Full-automatic mechanical deburring equipment |
| CN110899163A (en) * | 2019-12-13 | 2020-03-24 | 安徽信息工程学院 | Heating pipeline interface grinding device |
| CN111376120A (en) * | 2020-04-29 | 2020-07-07 | 江苏寅昊智能装备有限公司 | Pipeline centre gripping grinding device |
| CN111872772A (en) * | 2020-07-27 | 2020-11-03 | 彭琦 | Processing method of PVC (polyvinyl chloride) pipe |
| CN111872772B (en) * | 2020-07-27 | 2021-06-11 | 山东联塑科技实业有限公司 | Processing method of PVC (polyvinyl chloride) pipe |
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| Publication number | Publication date |
|---|---|
| CN109571176B (en) | 2020-04-07 |
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