CN104476770B - A kind of plastic tube welding machine - Google Patents
A kind of plastic tube welding machine Download PDFInfo
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- CN104476770B CN104476770B CN201410641174.6A CN201410641174A CN104476770B CN 104476770 B CN104476770 B CN 104476770B CN 201410641174 A CN201410641174 A CN 201410641174A CN 104476770 B CN104476770 B CN 104476770B
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- generates heat
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- friction generates
- mechanical vibration
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Abstract
The invention discloses a kind of plastic tube welding machine, including rack-mounted actuating unit, eccentric rotary mechanism and mechanical vibration friction generates heat mechanism, described actuating unit is arranged on below frame, and be connected with eccentric rotary mechanism by Timing Belt, friction generates heat that mechanism is connected for described eccentric rotary mechanism and mechanical vibration, described mechanical vibration friction generates heat mechanism both sides are respectively arranged with positioning fixture and axial boosting mechanism, and the center of positioning fixture and mechanical vibration friction generates heat mechanism and axially boosting mechanism be centrally located on same straight line.Friction generates heat that channel angular pipe fitting end face carries out sweat soldering by using for the present invention, reduces the use cost using sweat soldering；The present invention combines with positioning fixture by using axial boosting mechanism, it is possible to achieve locking and the effect of unclamping to pipe fitting, so that pipe fitting welding uniform force, improves welding quality and the welding efficiency of pipe fitting.
Description
Technical field
The invention belongs to plastics pipe welding technical field, relate to a kind of welder, especially relate to a kind of plastic pipe
Bonding machine.
Background technology
Plastic tube be usually with plastic resin as raw material, add stabilizer, lubricant etc., with injection method at tuber
Interior form through extrusion process.Due to it have light weight, corrosion-resistant, good looking appearance, without bad smell, handling ease, easy construction
Etc. feature, therefore it is widely applied in architectural engineering.Along with the extensive application of plastic tube, indispensable as plastic tube ratio
Connection member have also been obtained and develop rapidly, wherein joint for plastic tube is especially prominent, and its product category is various, but existing plastics
, there is material usage big in different due to connected piece of pipe joint, processing cost high the most in the fabrication process, so that
Obtain selling price higher, and then affect product sales volume.In order to meet must asking of consumers in general, occur in that various the most on the market
The isometrical plastic tube series of products of various kinds.This kind of isometrical plastic tube product produce time, its requisite processing step be by
The plastic tube that two calibers are identical links together, and in order to meet this production requirement, occurs in that many plastics pipe welding at present
Equipment.
Such as, the Chinese patent of Publication No. CN 203847824U discloses a kind of sequential welding continuous plastics laid in succession
Pipeline moves welding car, including crawler body and chassis platform, is provided with cluster engine, turns round and hang on the side of chassis platform
Machine, Hydraulic Station and operating console, revolution loop wheel machine is fixed on the platform of chassis, and the opposite side at chassis platform is provided with for plastics
The hot-melt welding machine of pipeline welding, hot-melt welding machine is fixed on the platform of chassis.This technical scheme can be while welding plastic conduit
Become long pipeline, by under pipeline laying to ditch, reduce construction equipment, reduce construction cost.But owing to also welding car in weldering
It is, by hot-melt welding machine, two sealing of tube are become a root length pipe when connecing, after plastics pipe welding end need to do cut process, carries out electricity add
Hot butt welding is welded, welding machine complex process, and uses sweat soldering to add welding cost；Long-pending big by this welding car body, knot
Structure is heavy, is only applicable to the connection of plastic conduit and lays, and is not suitable for the welding of isometrical plastic pipe；The most existing plastic tube
Welding equipment does not has any augmentor, therefore, causes seam bad, affect weldquality in welding process.
Summary of the invention
For solving the problems referred to above, the invention provides a kind of plastic tube welding machine.
The present invention is achieved by following technical solution.
A kind of plastic tube welding machine, including rack-mounted actuating unit, eccentric rotary mechanism and mechanical vibration
Friction generates heat mechanism, described actuating unit is arranged on below frame, and is connected with eccentric rotary mechanism by Timing Belt, described partially
Friction generates heat that mechanism is connected for heart rotating mechanism and mechanical vibration, and friction generates heat that mechanism both sides are respectively arranged with is fixed in described mechanical vibration
Position fixture and axial boosting mechanism, and the center of positioning fixture and mechanical vibration friction generates heat mechanism and axially in boosting mechanism
The heart is located on the same line.
Described actuating unit includes motor and is arranged on the active synchronization wheel of motor output end, and described eccentric rotary mechanism wraps
Including bearing block, eccentric shaft and connecting rod, wherein, eccentric shaft is arranged on bearing block, is positioned at bearing block both sides respectively on eccentric shaft
Being provided with driven wheel and the connecting rod base of synchronizing, driven synchronization wheel is connected with active synchronization wheel by Timing Belt, and connecting rod base passes through bearing pin
With rod hinge connection.
Friction generates heat that mechanism includes rack slide, tooth bar guide pad and gear fixture, wherein, gear fixture in described mechanical vibration
It is arranged on above tooth bar guide pad by hold-down support and pivoting support respectively, is arranged above fixture upper cover at gear fixture.
Described axial boosting mechanism includes fixed guide block, slide-and-guide block, afterburning clamp base, eccentric lever and thick stick
Bar hinged seat, wherein, eccentric lever is hinged with lever hinged seat, and slide-and-guide block is arranged on inside fixed guide block, afterburning
Clamp base is arranged on slide-and-guide block, and is connected with eccentric lever by key seat.
The number of teeth of described active synchronization wheel is more than the driven number of teeth synchronizing wheel.
It is provided with, on the exterior arc surface of described gear fixture bottom, the driving cog engaged with rack slide.
Described afterburning clamp base top is provided with compact heap.
Described eccentric lever one end is additionally provided with bearing pin mounting groove, and bearing pin mounting groove one end is being provided with handle.
It is additionally provided with hinge hole on described eccentric lever.
The invention has the beneficial effects as follows:
Compared with prior art, friction generates heat that channel angular pipe fitting end face carries out sweat soldering by using for the present invention, reduces
Use the use cost of sweat soldering；Owing to being that end face directly docks, it is not necessary to carry out any cut process, technique is simple,
Weld seam is smaller simultaneously, the most invisible, substantially increases the welding quality of product；The present invention is by using axial boosting mechanism
Combine with positioning fixture, it is possible to achieve locking and the effect of unclamping to pipe fitting, so that pipe fitting welding uniform force, improve
The welding quality of pipe fitting and welding efficiency.Present configuration is compact, and type is small and exquisite, it is simple to indoor and outdoor working environment, simple to operate,
Convenient, efficiency is high, and labor intensity is little, can be in isometrical plastic pipe hot-melt welding technology field wide popularization and application.
Accompanying drawing explanation
Fig. 1 is the structural representation of the present invention；
Eccentric rotary mechanism and mechanical vibration friction generates heat mechanism's mounting structure schematic diagram in Fig. 2 present invention；
Fig. 3 is the structural representation of axial boosting mechanism in the present invention；
Fig. 4 is the structural representation of eccentric lever in the present invention；
Fig. 5 is the structural representation of middle gear fixture of the present invention；
Fig. 6 is the mounting structure schematic diagram of middle gear fixture of the present invention；
Fig. 7 is the structural representation of fixture upper cover in the present invention；
Fig. 8 is the structural representation after axial boosting mechanism removes fixed guide block and eccentric lever in the present invention；
Fig. 9 is the structural representation of middle rack slide block of the present invention；
Figure 10 is the structural representation of eccentric shaft in the present invention；
Figure 11 is plastic pipe and the mounting structure schematic diagram of pipe joint in the present invention；
Figure 12 is the structural representation that in the present invention, all fixtures locked by plastic pipe and pipe joint after installing.
In figure: 1-actuating unit, 2-positioning fixture, 3-eccentric rotary mechanism, 4-mechanical vibration friction generates heat mechanism, 5-axle
To reinforcing structure, 6-frame, 11-motor, 12-active synchronization wheel, 21-positioning seat, 22-locating cover, 23-installing hole, 31-is driven
Synchronize wheel, 32-bearing block, 33-eccentric shaft, 34-connecting rod base, 35-connecting rod, 41-rack slide, 42-hold-down support, 43-tooth bar
Guide pad, 44-gear fixture, 45-pivoting support, 46-fixture upper cover, 51-fixed guide block, 52-slide-and-guide block, 53-adds
Power clamp base, 54-compact heap, 55-key seat, 56-eccentric lever, 57-lever hinged seat, 58-handle, 441-driving cog,
561-bearing pin mounting groove, 562-hinge hole.
Detailed description of the invention
Further describe technical scheme below in conjunction with the accompanying drawings, but claimed scope is not limited to institute
State.
As shown in Figures 1 to 10, a kind of plastic tube welding machine of the present invention, dynamic including be arranged in frame 6
Force mechanisms 1, eccentric rotary mechanism 3 and mechanical vibration friction generates heat mechanism 4, described actuating unit 1 is arranged on below frame 6, and
Being connected with eccentric rotary mechanism 3 by Timing Belt, friction generates heat that mechanism 4 is connected for described eccentric rotary mechanism 3 and mechanical vibration, institute
State mechanical vibration friction generates heat that mechanism 4 both sides are respectively arranged with in positioning fixture 2 and axial boosting mechanism 5, and positioning fixture 2
The heart and mechanical vibration friction generates heat mechanism 4 and axially boosting mechanism 5 are centrally located on same straight line.Use this technical side
Case, actuating unit 1 drives eccentric rotary mechanism 3 to rotate by Timing Belt, and rotation is converted to mechanical vibration by eccentric rotary mechanism 3
The linear reciprocating motion of friction generates heat mechanism 4, thus the other end of two tubing or pipe fitting is clamped in mechanical vibration mill respectively
Wipe and in heat mechanism 4, produce friction, by axial augmentor 5, tubing or pipe fitting are applied a level pressure to pipe box direction simultaneously
Power, makes contact surface produce frictional heat, high temperature melting, after tubing or pipe fitting reach expection molten condition, makes the motion of pipe box stop
Only, tubing or pipe fitting in molten condition cool down, are solidified as one, become tubing or pipe fitting that permanent bond is integrated.
Described actuating unit 1 includes motor 11 and is arranged on the active synchronization wheel 12 of motor 11 outfan, and described bias turns
Motivation structure 3 includes bearing block 32, eccentric shaft 33 and connecting rod 35, and wherein, eccentric shaft 33 is installed on bearing blocks 32, at eccentric shaft 33
On be positioned at bearing block 32 both sides and be separately installed with the driven wheel 31 and connecting rod base 34 that synchronizes, the driven wheel 31 that synchronizes is by Timing Belt and master
The dynamic wheel 12 that synchronizes is connected, and connecting rod base 34 is hinged with connecting rod 35 by bearing pin.
Friction generates heat that mechanism 4 includes rack slide 41, tooth bar guide pad 43 and gear fixture 44 in described mechanical vibration, its
In, gear fixture 44 is arranged on above tooth bar guide pad 43, at gear fixture by hold-down support 42 and pivoting support 45 respectively
44 are arranged above fixture upper cover 46.
Described axial boosting mechanism 5 includes fixed guide block 51, slide-and-guide block 52, afterburning clamp base 53, eccentric
Lever 56 and lever hinged seat 57, wherein, eccentric lever 56 is hinged with lever hinged seat 57, and slide-and-guide block 52 is arranged on solid
Determining guide pad 51 internal, afterburning clamp base 53 is arranged on slide-and-guide block 52, and by key seat 55 and eccentric lever 56
It is connected.
Described positioning fixture 2 includes that positioning seat 21 and locating cover 22, described locating cover 22 are bolted on positioning seat
On 21.An installing hole 23, the center of described installing hole 23 and gear fixture 44 is formed after locating cover 22 is fixing with positioning seat 21
With fixture upper cover 46 formed die cavity center on same straight line, with ensure pipe fitting install location be axiality.
The number of teeth of described active synchronization wheel 12 is more than the driven number of teeth synchronizing wheel 31.So can be by the tooth of two synchronization wheels
Number is poor and promotes rotating speed.
It is provided with, on the exterior arc surface of described gear fixture 44 bottom, the driving cog 441 engaged with rack slide 41.So, tooth
When bar slide block 41 moves, the driving cog 441 on rack slide 41 and gear fixture 44 engages, and driven gear fixture 44 1 acts as
Forward and reverse, the rotation of low-angle, back and forth high speed, makes axial inwall and two tubing inserted in fixture or the pipe of gear fixture 44
Produce friction between part, simultaneously by axially tubing or pipe fitting being applied certain pressure to fixture direction to boosting mechanism 5, make to connect
Contacting surface produces frictional heat, high temperature melting, thus realizes the sweat soldering of pipe fitting.
Described afterburning clamp base 53 top is provided with compact heap 54.Compact heap 54 is by bolt and afterburning clamp base 53
Connect, in use, first unclamp bolt and open compact heap 54, then jointed tubular workpieces fusion is installed, after pipe fitting installs, rotate pressure
Bolt, to pipe fitting installation site, is tightened by tight block 54.
As shown in Figure 4, described eccentric lever 56 one end is additionally provided with bearing pin mounting groove 561, away from bearing pin mounting groove
561 one end are provided with handle 58.
It is additionally provided with hinge hole 562 on described eccentric lever 56.For eccentric lever 56 is hinged on lever
On hinged seat 57.
Above-mentioned tooth bar guide pad 43 is T-slot guide block structure, is i.e. provided with T-slot, tooth bar on tooth bar guide pad 43
Slide block 41 is arranged in T-slot, by T-slot structure, it is ensured that rack slide 41 does linear movement in T-slot, and safety can
Lean on.
Above-mentioned fixed guide block 51 is T-shaped fit structure with slide-and-guide block 52, is i.e. machined with T on fixed guide block 51
Shape groove, slide-and-guide block 52 is designed to the T-shaped structure coordinated with T-slot, so, when handle about 58 pressurizes, slide-and-guide
Block 52 and the assembly that is connected as a single entity with slide-and-guide block 52 move left and right along the T-slot direction of fixed guide block 51, thus reach
Effect that is afterburning to locking and that unclamp.
In technique scheme, it is sliding that described gear fixture 44 is arranged on tooth bar by pivoting support 45 and hold-down support 42
Above block 41, fixture upper cover 46 is arranged on above gear fixture 44, and wherein, bearing pin and pivoting support are passed through in fixture upper cover 46 one end
45 connect, and the other end is locked on hold-down support 42 by bolt；Gear fixture 44 and fixture upper cover 46 are formed after installing Guan Bi
One die cavity that can accommodate pipe fitting, the diameter of this die cavity is more than jointed tubular workpieces diameter fusion, and is reserved with the fit-up gap of 0.3mm.
Owing to being provided with the driving cog 441 engaged with rack slide 41 on the arc surface of gear fixture 44.Therefore, operationally, directly
Connect in the die cavity that jointed tubular workpieces fusion insertion fixture upper cover 46 and gear fixture 44 are formed, drive tooth by eccentric rotary mechanism 3
Bar slide block 41 moves, and rack slide 41 and gear fixture 44 engage, and driven gear fixture 44 1 act as forward and reverse, low-angle,
Reciprocal rotation at a high speed, makes to produce between the axial inwall of gear fixture 44 and two tubing or the pipe fitting of insert type intracavity mill
Wipe, by axial boosting mechanism 5, tubing or pipe fitting are applied certain pressure to fixture direction simultaneously, make contact surface produce friction
Heat, high temperature melting, thus realize the sweat soldering of pipe fitting.
The present invention in use, first installs fusion joining two pipes together and pipe fitting；Treat that pipe as shown in figure 11 and pipe fitting are installed
After Hao, locking is so fixture (as shown in figure 12)；Welding can be started after installing pipe and pipe fitting.As shown in Figure 1, Figure 2, Fig. 3 institute
Showing, when sweat soldering, motor 11 drives active synchronization wheel 12 rotation, drives the driven wheel 31 that synchronizes to rotate by Timing Belt, and
Promoting rotating speed due to two number of teeth differences synchronizing wheel, its power passes to and driven Tong Bu wheel 31 coaxial eccentric shafts 33, eccentric
Axle 33 is connected with connecting rod 35 one end by connecting rod base 34, and the other end of connecting rod 35 is connected with rack slide 41, operationally, and connecting rod
The high-speed rotation of eccentric shaft 33 is converted to rack slide 41 by 35 to do reciprocating linear motion, and rack slide 41 imparts power to again
Gear fixture 44, fixture upper cover 46 and gear fixture 44 are assembled together, so that in gear fixture 44 and fixture upper cover 46
Wall is point on the basis of its axle center, makees forward and reverse, the rotation of low-angle, back and forth high speed, makes axial inwall and the insertion fixture of fixture
Between interior two tubing or pipe fitting, (other end of two tubing or pipe fitting is clamped on built-up jig respectively) produces friction,
By axial boosting mechanism 5, tubing or pipe fitting are applied certain pressure to fixture inwall direction simultaneously, make contact surface produce friction
Heat, high temperature melting, after tubing or pipe fitting reach expection molten condition, make the motion of pipe box stop (motor stops operating), in
The tubing of molten condition or pipe fitting cool down, are solidified as one, become tubing or pipe fitting that permanent bond is integrated.
The operation principle of the present invention is: when starting to weld, and actuating unit driven by motor active synchronization wheel rotates, by synchronizing
Band drives the driven synchronization wheel speed-raising of eccentric rotary mechanism to rotate, and makes the connecting rod of eccentric rotary mechanism pull mechanical vibration friction raw
The rack slide of heat engine structure, it is raw that rack slide driven gear fixture makees to come and go at a high speed rotation, pipe and pipe fitting end face high-speed friction
Thermal welding is together.After whole pipe and pipe fitting welding complete, opening all fixtures and take out product, welding required time is less than
2 seconds, it is greatly improved welding efficiency.
Claims (5)
1. a plastic tube welding machine, it is characterised in that: include actuating unit (1), the eccentric rotary being arranged in frame (6)
Mechanism (3) and mechanical vibration friction generates heat mechanism (4), described actuating unit (1) is arranged on frame (6) lower section, and by synchronizing
Band is connected with eccentric rotary mechanism (3), and friction generates heat that mechanism (4) is connected for described eccentric rotary mechanism (3) and mechanical vibration, described
Friction generates heat that mechanism (4) both sides are respectively arranged with positioning fixture (2) and axial boosting mechanism (5), and positioning fixture in mechanical vibration
(2) center and mechanical vibration friction generates heat mechanism (4) and axially boosting mechanism (5) are centrally located on same straight line；Institute
State actuating unit (1) include motor (11) and be arranged on active synchronization wheel (12) of motor (11) outfan, described eccentric rotary
Mechanism (3) includes bearing block (32), eccentric shaft (33) and connecting rod (35), and wherein, eccentric shaft (33) is arranged on bearing block (32),
Eccentric shaft (33) is positioned at bearing block (32) both sides and is separately installed with driven synchronization wheel (31) and connecting rod base (34), driven synchronization
Wheel (31) is connected with active synchronization wheel (12) by Timing Belt, and connecting rod base (34) is hinged with connecting rod (35) by bearing pin；Described machine
Friction generates heat that mechanism (4) includes rack slide (41), tooth bar guide pad (43) and gear fixture (44), wherein, gear in tool vibration
Fixture (44) is arranged on tooth bar guide pad (43) top by hold-down support (42) and pivoting support (45) respectively, at gear fixture
(44) fixture upper cover (46) it is arranged above；Described axial boosting mechanism (5) includes fixed guide block (51), slide-and-guide block
(52), afterburning clamp base (53), eccentric lever (56) and lever hinged seat (57), wherein, eccentric lever (56) and thick stick
Bar hinged seat (57) is hinged, and it is internal that slide-and-guide block (52) is arranged on fixed guide block (51), and afterburning clamp base (53) is installed
On slide-and-guide block (52), and it is connected with eccentric lever (56) by key seat (55)；Outside described gear fixture (44) bottom
The driving cog (441) engaged with rack slide (41) it is provided with on arc surface.
A kind of plastic tube welding machine the most according to claim 1, it is characterised in that: the tooth of described active synchronization wheel (12)
Number is more than the driven number of teeth synchronizing wheel (31).
A kind of plastic tube welding machine the most according to claim 1, it is characterised in that: described afterburning clamp base (53) top
Portion is provided with compact heap (54).
A kind of plastic tube welding machine the most according to claim 1, it is characterised in that: described eccentric lever (56) one end
It is additionally provided with bearing pin mounting groove (561), bearing pin mounting groove (561) one end is being provided with handle (58).
A kind of plastic tube welding machine the most according to claim 1, it is characterised in that: described eccentric lever (56) is upper also
It is provided with hinge hole (562).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410641174.6A CN104476770B (en) | 2014-11-13 | 2014-11-13 | A kind of plastic tube welding machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410641174.6A CN104476770B (en) | 2014-11-13 | 2014-11-13 | A kind of plastic tube welding machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104476770A CN104476770A (en) | 2015-04-01 |
| CN104476770B true CN104476770B (en) | 2016-09-14 |
Family
ID=52751440
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410641174.6A Expired - Fee Related CN104476770B (en) | 2014-11-13 | 2014-11-13 | A kind of plastic tube welding machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104476770B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110641037B (en) * | 2019-09-25 | 2021-05-28 | 浙江中匠装饰材料有限公司 | Auxiliary installer for building plastic pipeline joint |
| CN111958992A (en) * | 2020-08-14 | 2020-11-20 | 芜湖新磊塑胶科技有限公司 | Uniform feeding tool for plastic pipes |
| CN115091765A (en) * | 2022-05-25 | 2022-09-23 | 长春亚大汽车零件制造有限公司 | Non-metal pipeline and joint induction type welding method and device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6110439A (en) * | 1984-02-28 | 1986-01-17 | Osaka Gas Co Ltd | Changeover device of automatic operation/manual operation for locking device of fusion welder for resin pipe |
| US5277744A (en) * | 1990-12-27 | 1994-01-11 | Hydroacoustics Inc. | Friction welder having a drive which produces orbital motion |
| CN1872481A (en) * | 2006-06-23 | 2006-12-06 | 首都航天机械公司 | Friction welding installation |
| CN202753442U (en) * | 2012-06-21 | 2013-02-27 | 林慧鹏 | A water supply and drainage plastic pipe friction welding machine |
| CN204322512U (en) * | 2014-11-13 | 2015-05-13 | 贵州黔南科技塑业有限公司 | A kind of isometrical plastic pipe welding equipment |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203076780U (en) * | 2012-12-26 | 2013-07-24 | 常州福伦特无铅焊料有限公司 | Butt welding machine for production of soldering wires |
-
2014
- 2014-11-13 CN CN201410641174.6A patent/CN104476770B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6110439A (en) * | 1984-02-28 | 1986-01-17 | Osaka Gas Co Ltd | Changeover device of automatic operation/manual operation for locking device of fusion welder for resin pipe |
| US5277744A (en) * | 1990-12-27 | 1994-01-11 | Hydroacoustics Inc. | Friction welder having a drive which produces orbital motion |
| CN1872481A (en) * | 2006-06-23 | 2006-12-06 | 首都航天机械公司 | Friction welding installation |
| CN202753442U (en) * | 2012-06-21 | 2013-02-27 | 林慧鹏 | A water supply and drainage plastic pipe friction welding machine |
| CN204322512U (en) * | 2014-11-13 | 2015-05-13 | 贵州黔南科技塑业有限公司 | A kind of isometrical plastic pipe welding equipment |
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| CN104476770A (en) | 2015-04-01 |
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Effective date of registration: 20210708 Address after: 558000 plant 504, Gantang Town, Duyun City, Qiannan Buyi and Miao Autonomous Prefecture, Guizhou Province Patentee after: DUYUN SHUANGCHENG MACHINERY EQUIPMENT Co.,Ltd. Address before: 558000 room 108, building 5, 24 xieguanchong Road, Duyun City, Qiannan Buyi and Miao Autonomous Prefecture, Guizhou Province Patentee before: Wang Yueyong |
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