CN104015383B - High temperature valve seat bush production technology - Google Patents
High temperature valve seat bush production technology Download PDFInfo
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- CN104015383B CN104015383B CN201410256376.9A CN201410256376A CN104015383B CN 104015383 B CN104015383 B CN 104015383B CN 201410256376 A CN201410256376 A CN 201410256376A CN 104015383 B CN104015383 B CN 104015383B
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Abstract
The invention belongs to valve seat manufacturing technology field, especially relate to a kind of high temperature valve seat bush production technology.It solve the technical problems such as prior art is not reasonable.Comprise the steps: to get the raw materials ready, preforming, be molded, post-process.Compared with prior art, the advantage of this high temperature valve seat bush production technology is: 1, easy to process, saves material.2, process time is shorter, effectively raises production efficiency, adds enterprise production, can process more product within the identical time.3, machining accuracy is high, effectively reduces the generation of defective products.
Description
Technical field
The invention belongs to valve seat manufacturing technology field, especially relate to a kind of high-temperature valve seat pad
Set production technology.
Background technology
Valve seat is detachable face component in valve, is used for supporting spool closed positions, and
Constitute sealing pair.General valve-seat diameter is valve maximum flow diameter.Such as butterfly valve
Valve seat material widely, all kinds of rubber, plastics, metal material all can be as valve seat
Material, such as: EPDM, NBR, NR, PTFE, PEEK, PFA, SS315, STELLITE
Etc..Valve seat bush is formed into one of valve seat critical piece, now with in technology, and valve seat
Lining typically uses cylindrical shape raw material by lathe turning aftershaping, and this manufacture method is not
Only cause that manufacturing cost is higher, it is relatively complicated to process, more waste social resources, no
Meet the theory of energy-conserving and environment-protective.
Summary of the invention
It is an object of the invention to for the problems referred to above, it is provided that a kind of easy to process, save material
The high temperature valve seat bush production technology of material.
For reaching above-mentioned purpose, present invention employs following technical proposal: this high temperature valve seat
Lining production technology, it is characterised in that this technique comprises the steps:
A, get the raw materials ready: intercept one section of the materials in the tube being made of plastics, obtain cylindrically and two
The blank that end flushes；
B, preforming: blank is heated by heater, by the blank after heating
One end insert in forming gap, this forming gap be formed at be disposed adjacent first shaping
Between wheel body and the second shaping wheel body, when the first shaping wheel body and the second shaping wheel body are reverse
During rotation, what one end extruding formation of the blank being positioned at forming gap was turned up turns edge；Weight
Multiple aforesaid operations, what the other end at blank was processed to form that another turns up turns edge；Obtain in
The preforming blank of I shape；
C, shaping: preforming blank is enclosed within outside the bulge loop in the middle part of central cylinder, in advance
Two of shaping blank fix spliced outer cylinder body between turning edge, so that preforming blank
Middle part be clamped between bulge loop and spliced outer cylinder body, then divide at central cylinder two ends
Not putting end ring, described end ring is pressed on the end face of spliced outer cylinder body by turning edge, and obtains
Equipped with the mould assembly of preforming blank, then will be equipped with the shaping of preforming blank
Die assembly is positioned in press and two end ring is applied pressure, so that preforming blank
It is shaped into lining base；
D, post processing: remove end ring and central cylinder after press extrudes, then will be with
The spliced outer cylinder body of lining base is put on perforating apparatus, just makes the perforated pins of perforating apparatus
Through hole to spliced outer cylinder body sidepiece, then makes perforated pins pass through hole, thus at lining
Set base sidepiece forms side opening；After all side opening completion of processing, remove spliced outer cylinder body,
Then in each described side opening, insert stopple and determine hole, obtain high temperature valve seat bush.
In above-mentioned high temperature valve seat bush production technology, in described step A, will cut
The inner and outer wall of the blank got carry out polishing processing respectively and polish processing after outside blank
The roughness of wall is more than the roughness of inwall；Described blank is made up of polytetrafluoroethylene (PTFE)；
In above-mentioned steps D, after machining side opening outside described lining base outer wall is combined and is connected
Lining.
In above-mentioned high temperature valve seat bush production technology, in described step B, right
Turn edge during carrying out extrusion process, by blowing hot wind device to blank blowing hot-air；Described
Blowing hot wind device is 70-90 DEG C to the temperature of blank heating.
In above-mentioned high temperature valve seat bush production technology, in described step B, described
First shaping wheel body and second shaping wheel body be separately fixed on driving shaft and driven shaft,
Described driving shaft and driven shaft are arranged on pedestal in parallel to each other, described driving shaft
Upper connection has the drive mechanism that driving shaft can be driven to rotate, described driving shaft and driven shaft
Between be provided with can make driving shaft drive driven shaft rotate transmission mechanism.
In above-mentioned high temperature valve seat bush production technology, described transmission mechanism includes solid
The driving gear being scheduled on driving shaft and the driven gear being fixed on driven shaft, described
Driving gear is meshed with driven gear.
In above-mentioned high temperature valve seat bush production technology, described drive mechanism includes solid
The driving motor being scheduled in frame, described driving motor passes through coupling structure and driving shaft
Being connected, described pedestal is fixed in frame；Described coupling structure includes being fixed on and drives
The first ring flange on dynamic motor output shaft and the second flange being fixed on driving shaft one end
Dish, the first described ring flange and the second ring flange are connected.
In above-mentioned high temperature valve seat bush production technology, described pedestal is provided with can be adjusted
Spacing between whole driving shaft and driven shaft thus change between the size of described forming gap
Gap governor motion；Described gap adjusting mechanism includes the mounting groove being arranged on pedestal,
Being provided with adjustment seat in mounting groove and adjustment seat is slidably connected with mounting groove, described is driven
Axle is located in adjustment seat and is provided with at least one bearing between driven shaft and adjustment seat,
The regulation bolt being connected with base thread, described regulation spiral shell it is equipped with on described pedestal
It is outer and be fixed with turning handle that one end of bolt is positioned at pedestal, the other end be positioned at pedestal and with regulation
Seat is rotationally connected.
In above-mentioned high temperature valve seat bush production technology, described pedestal is provided with and is positioned at
First shaping wheel body and the width adjusting mechanism that turns edge of the external side of the second briquetting roller；Described
The width adjusting mechanism that turns edge includes being positioned at the first shaping wheel body and the second briquetting roller body is peripheral
Baffle plate and the outer end that turns edge when the shaping that turns edge is to required width can contact with baffle plate, described
Baffle plate moves axially along the first shaping wheel body and the second shaping wheel body with driving baffle plate
Axially displaced structure be connected.
In above-mentioned high temperature valve seat bush production technology, described axially displaced structure bag
Include the adjustment bolt being located on pedestal, described adjustment bolt respectively with driving shaft and from
Moving axis be arranged in parallel, and described baffle plate is fixed on the one end adjusting bolt, adjusts bolt
The other end is located on pedestal and adjusts threaded on bolt laying respectively at inside pedestal
Adjusting nut with outside.
In above-mentioned high temperature valve seat bush production technology, described baffle plate is provided with one
Arc groove, and arc groove and first is molded wheel body or the second briquetting roller body space coordinates；Or
Baffle plate described in person is provided with two arc grooves, and one of them arc groove and first is molded
Wheel body matched in clearance, another arc groove and the second briquetting roller body space coordinate.
Compared with prior art, the advantage of this high temperature valve seat bush production technology is: 1,
Easy to process, save material.2, process time is shorter, effectively raises production efficiency,
Add enterprise production, more product can be processed within the identical time.3, machining accuracy
Height, effectively reduces the generation of defective products.
Accompanying drawing explanation
Fig. 1 is the machining state part isometric structural representation that the present invention provides.
Fig. 2 is the perspective view of the processing equipment that the present invention provides.
Fig. 3 is the processing equipment perspective view at another visual angle that the present invention provides.
Fig. 4 is compressor operation status architecture schematic diagram in step C that the present invention provides.
Fig. 5 is the structural representation of mould assembly in step C that the present invention provides.
Fig. 6 is the knot at another visual angle of mould assembly in step C that the present invention provides
Structure schematic diagram.
Fig. 7 is the structural representation of the processed finished products that the present invention provides.
Fig. 8 is the blank structure schematic diagram that the present invention provides.
Fig. 9 is the structural representation of the punching state that the present invention provides.
In figure, blank 1, forming gap 1a, first shaping wheel body the 2, second briquetting roller
Body 3, turn edge 11, central cylinder 4, bulge loop 41, spliced outer cylinder body 42, end ring 43,
Mould assembly 4a, press 5, perforating apparatus 6, perforated pins 61, through hole 421,
Side opening 12, blowing hot wind device 7, driving shaft 21, driven shaft 22, pedestal 8, drive mechanism
9, transmission mechanism 10, driving gear 101, driven gear 102, frame 13, driving electricity
Machine the 91, first ring flange the 92, second ring flange 93, gap adjusting mechanism 81, installation
Groove 811, adjustment seat 812, bearing 813, regulation bolt 814, turning handle 815, turn edge
Width adjusting mechanism 82, baffle plate 821, adjustment bolt 83, adjusting nut 831, circular arc
Groove 821a.
Detailed description of the invention
As shown in figs 1-9, this high temperature valve seat bush production technology comprises the steps:
A, get the raw materials ready: intercept one section of the materials in the tube being made of plastics, obtain cylindrically and two
The blank 1 that end flushes；
B, preforming: blank 1 is heated by heater, by the base after heating
One end of material 1 inserts in forming gap 1a, and this forming gap 1a is formed at and is disposed adjacent
The first shaping wheel body 2 and the second shaping wheel body 3 between, when first is molded wheel body 2 He
When second shaping wheel body 3 rotates backward, it is positioned at one end of the blank 1 of forming gap 1a
Extruding formed turn up turn edge 11；Repeating aforesaid operations, the other end at blank 1 is processed
Form that another turns up turns edge 11；Obtain the preforming blank 1 in I shape；
C, shaping: preforming blank 1 is enclosed within outside the bulge loop 41 in the middle part of central cylinder 4
Side, turns edge two of preforming blank 1 and fixes spliced outer cylinder body 42 between 11,
So that the middle part of preforming blank 1 be clamped in bulge loop 41 and spliced outer cylinder body 42 it
Between, then overlapping end ring 43 respectively at central cylinder 4 two ends, end ring 43 will turn edge 11
It is pressed on the end face of spliced outer cylinder body 42, obtains the mould equipped with preforming blank 1
Assembly 4a, the mould assembly 4a that then will be equipped with preforming blank 1 are positioned over pressure
Machine 5 applies pressure to two end ring 43, so that preforming blank 1 is shaped into lining
Base；
D, post processing: after press 5 extrudes, remove end ring 43 and central cylinder 4, so
After the spliced outer cylinder body 42 with lining base is put on perforating apparatus 6, make perforation set
The perforated pins 61 of standby 6 just through hole 421 to spliced outer cylinder body 42 sidepiece, then makes
Perforated pins 61 is through through hole 421, thus forms side opening 12 at lining base sidepiece；All sides
After the completion of processing of hole 12, remove spliced outer cylinder body 42, then in each side opening 12
Insert stopple and determine hole, obtain high temperature valve seat bush.
In above-mentioned steps A, the inner and outer wall of the blank 1 being truncated to is carried out respectively
After polishing processing and polishing processing, the roughness of blank 1 outer wall is more than the roughness of inwall；
Blank 1 is made up of polytetrafluoroethylene (PTFE)；In above-mentioned steps D, machine side opening 12
After at the compound outer lining layer that is connected of described lining base outer wall.
In above-mentioned steps B, heater is 165-185 to the temperature that blank 1 heats
Degree, wherein 180 degree the most applicable.
In above-mentioned steps B, to turn edge 11 carry out extrusion process during, by heat
Hair-dryer 7 is to blank 1 blowing hot-air；The temperature that blank 1 is heated by blowing hot wind device 7 is
70-90℃。
In above-mentioned steps B, the first shaping wheel body 2 and the second shaping wheel body 3 are solid respectively
Being scheduled on driving shaft 21 and driven shaft 22, driving shaft 21 and driven shaft 22 are parallel to each other
Be arranged on pedestal 8, driving shaft 21 connects to be had driving shaft 21 can be driven to rotate
Drive mechanism 9, is provided with between driving shaft 21 and driven shaft 22 and driving shaft 21 can be made to drive
The transmission mechanism 10 that driven shaft 22 rotates.
Transmission mechanism 10 includes the driving gear 101 being fixed on driving shaft 21 and fixes
Driven gear 102 on driven shaft 22, driving gear 101 and driven gear 102 phase
Engagement；Drive mechanism 9 includes the driving motor 91 being fixed in frame 13, drives electricity
Machine 91 is connected with driving shaft 21 by coupling structure, and pedestal 8 is fixed in frame 13；
Coupling structure includes that the first ring flange 92 being fixed on driving motor 91 output shaft is with solid
It is scheduled on second ring flange 93 of driving shaft 21 one end, the first ring flange 92 and the second flange
Dish 93 is connected.
Pedestal 8 be provided with the spacing that can adjust between driving shaft 21 and driven shaft 22 thus
Change the gap adjusting mechanism 81 of the size of described forming gap；Gap adjusting mechanism 81
Including the mounting groove 811 being arranged on pedestal 8, in mounting groove 811, it is provided with adjustment seat
812 and adjustment seat 812 be slidably connected with mounting groove 811, driven shaft 22 is located in regulation
At least one bearing 813 it is provided with on seat 812 and between driven shaft 22 and adjustment seat 812,
It is equipped with the regulation bolt 814 threadeded with pedestal 8 on pedestal 8, regulates bolt 814
To be positioned at pedestal 8 outer and be fixed with turning handle 815 in one end, the other end be positioned at pedestal 8 and
It is rotationally connected with adjustment seat 812.
Pedestal 8 is provided with and is positioned at outside the first shaping wheel body 2 and the second shaping wheel body 3
Turn edge width adjusting mechanism 82；The width adjusting mechanism that turns edge 82 includes being positioned at the first shaping
Wheel body 2 and second is molded the baffle plate 821 of wheel body 3 periphery and when the shaping that turns edge is to required width
The outer end that turns edge when spending can contact with baffle plate 821, baffle plate 821 with can drive baffle plate 821
The axially displaced structure moved axially along the first shaping wheel body 2 and the second shaping wheel body 3
It is connected.
Axially displaced structure includes the adjustment bolt 83 being located on pedestal 8, adjusts bolt
83 be arranged in parallel with driving shaft 21 and driven shaft 22 respectively, and baffle plate 821 is fixed on adjustment
One end of bolt 83, the other end adjusting bolt 83 is located on pedestal 8 and adjusts spiral shell
Threaded on bolt 83 have the adjusting nut 831 laying respectively at pedestal 8 inner side and outer side；
Baffle plate 821 is provided with an arc groove 821a, and arc groove 821a and the first briquetting roller
Body 2 or the second shaping wheel body 3 matched in clearance；Or baffle plate 821 is provided with two circular arcs
Groove 821a, and one of them arc groove 821a and first shaping wheel body 2 matched in clearance,
Another arc groove 821a and second shaping wheel body 3 matched in clearance.
Specific embodiment described herein is only to present invention spirit theory for example
Bright.Those skilled in the art can be to described specific embodiment
Make various amendment or supplement or use similar mode to substitute, but without departing from
The spirit of the present invention or surmount scope defined in appended claims.
Although the most more employing blank 1, forming gap 1a, the first shaping wheel body
2, the second shaping wheel body 3, turn edge 11, central cylinder 4, bulge loop 41, spliced urceolus
Body 42, end ring 43, mould assembly 4a, press 5, perforating apparatus 6, perforated pins
61, through hole 421, side opening 12, blowing hot wind device 7, driving shaft 21, driven shaft 22, base
Seat 8, drive mechanism 9, transmission mechanism 10, driving gear 101, driven gear 102,
Frame 13, driving motor the 91, first ring flange the 92, second ring flange 93, gap are adjusted
Joint mechanism 81, mounting groove 811, adjustment seat 812, bearing 813, regulation bolt 814,
Turning handle 815, the width adjusting mechanism that turns edge 82, baffle plate 821, adjustment bolt 83, regulation
The terms such as nut 831, arc groove 821a, but it is not precluded from using the possibility of other term
Property.Use these terms to be only used to more easily to describe and explain the essence of the present invention；
It is all contrary with spirit of the present invention for being construed as any additional restriction.
Claims (10)
1. a high temperature valve seat bush production technology, it is characterised in that under this technique includes
State step:
A, get the raw materials ready: intercept one section of the materials in the tube being made of plastics, obtain cylindrically and two
The blank (1) that end flushes；
B, preforming: blank (1) is heated by heater, will be after heating
One end of blank (1) insert in forming gap (1a), this forming gap (1a) shape
Between the first shaping wheel body (2) and the second shaping wheel body (3) that Cheng Yu is disposed adjacent,
When the first shaping wheel body (2) and the second shaping wheel body (3) rotate backward, it is positioned at into
One end extruding of the blank (1) in type gap (1a) forms turn edge (11) turned up；
Repeating aforesaid operations, what the other end at blank (1) was processed to form that another turns up turns edge
(11)；Obtain the preforming blank (1) in I shape；
C, shaping: preforming blank (1) is enclosed within the bulge loop at central cylinder (4) middle part
(41) outside, in two fixing splicings between (11) that turn edge of preforming blank (1)
Formula outer cylinder body (42), so that the middle part of preforming blank (1) is clamped in bulge loop (41)
And between spliced outer cylinder body (42), then put respectively at central cylinder (4) two ends
End ring (43), described end ring (43) will turn edge (11) be pressed on spliced outer cylinder body (42)
End face, obtain the mould assembly (4a) equipped with preforming blank (1), then
The mould assembly (4a) that will be equipped with preforming blank (1) is positioned over press (5)
In two end ring (43) are applied pressure, so that preforming blank (1) is shaped into lining
Set base；
D, post processing: after press (5) extrudes, remove end ring (43) and central cylinder
(4), then the spliced outer cylinder body (42) with lining base is put in perforating apparatus (6)
On, make the perforated pins (61) of perforating apparatus (6) just to spliced outer cylinder body (42) side
The through hole (421) in portion, then make perforated pins (61) through through hole (421), thus
Lining base sidepiece forms side opening (12)；After all side openings (12) completion of processing, remove and spell
Connect formula outer cylinder body (42), then in each described side opening (12), insert stopple and determine hole,
Obtain high temperature valve seat bush.
High temperature valve seat bush production technology the most according to claim 1, its feature exists
In, in above-mentioned steps A, the inner and outer wall of the blank (1) being truncated to is entered respectively
Row polishes the roughness of blank (1) outer wall after processing and polish processing and is more than the coarse of inwall
Degree；Described blank (1) is made up of polytetrafluoroethylene (PTFE)；In above-mentioned steps D, processing
At the compound outer lining layer that is connected of described lining base outer wall after completing side opening (12).
High temperature valve seat bush production technology the most according to claim 1 and 2, it is special
Levy and be, in above-mentioned steps B, during turn edge (11) are carried out extrusion process,
By blowing hot wind device (7) to blank (1) blowing hot-air；Described blowing hot wind device (7) is right
The temperature that blank (1) heats is 70-90 DEG C.
High temperature valve seat bush production technology the most according to claim 1 and 2, it is special
Levy and be, in above-mentioned steps B, the first described shaping wheel body (2) and the second shaping
Wheel body (3) is separately fixed on driving shaft (21) and driven shaft (22), described master
Moving axis (21) and driven shaft (22) are arranged on pedestal (8) in parallel to each other, described
The upper connection of driving shaft (21) have the drive mechanism (9) that driving shaft (21) can be driven to rotate,
It is provided with between described driving shaft (21) and driven shaft (22) and driving shaft (21) can be made
Drive the transmission mechanism (10) that driven shaft (22) rotates.
High temperature valve seat bush production technology the most according to claim 4, its feature exists
In, described transmission mechanism (10) includes the driving tooth being fixed on driving shaft (21)
Wheel (101) and the driven gear (102) being fixed on driven shaft (22), described master
Moving gear (101) is meshed with driven gear (102).
High temperature valve seat bush production technology the most according to claim 4, its feature exists
In, described drive mechanism (9) includes the driving motor (91) being fixed in frame (13),
Described driving motor (91) is connected with driving shaft (21) by coupling structure, described
Pedestal (8) be fixed in frame (13)；Described coupling structure includes being fixed on and drives
Move the first ring flange (92) on motor (91) output shaft and be fixed on driving shaft (21)
Second ring flange (93) of one end, described the first ring flange (92) and the second ring flange
(93) it is connected.
High temperature valve seat bush production technology the most according to claim 4, its feature exists
In, described pedestal (8) is provided with and can adjust driving shaft (21) and driven shaft (22)
Between spacing thus change the gap adjusting mechanism (81) of the size of described forming gap；
Described gap adjusting mechanism (81) includes the mounting groove (811) being arranged on pedestal (8),
Adjustment seat (812) and adjustment seat (812) and mounting groove it is provided with in mounting groove (811)
(811) being slidably connected, described driven shaft (22) is located in adjustment seat (812)
And between driven shaft (22) and adjustment seat (812), it is provided with at least one bearing (813),
The regulation bolt (814) threadeded with pedestal (8) it is equipped with on described pedestal (8),
One end of described regulation bolt (814) is positioned at pedestal (8) and outward and is fixed with turning handle (815),
The other end is positioned at pedestal (8) and is rotationally connected with adjustment seat (812).
High temperature valve seat bush production technology the most according to claim 4, its feature exists
In, described pedestal (8) is provided with and is positioned at the first shaping wheel body (2) and the second shaping
The width adjusting mechanism that turns edge (82) in wheel body (3) outside；The described width adjustment that turns edge
Mechanism (82) includes that being positioned at the first shaping wheel body (2) and second is molded wheel body (3) outward
The baffle plate (821) enclosed and turn edge when the shaping that turns edge is to required width outer end energy and baffle plate
(821) contact, described baffle plate (821) with baffle plate (821) can be driven along the
The axially displaced structure that one shaping wheel body (2) and the second shaping wheel body (3) move axially
It is connected.
High temperature valve seat bush production technology the most according to claim 8, its feature exists
In, described axially displaced structure includes the adjustment bolt (83) being located on pedestal (8),
Described adjustment bolt (83) is parallel with driving shaft (21) and driven shaft (22) respectively
Arranging, described baffle plate (821) is fixed on the one end adjusting bolt (83), adjusts spiral shell
The other end of bolt (83) is located in pedestal (8) and above and adjusts the upper screw thread of bolt (83) even
It is connected to lay respectively at the adjusting nut (831) of pedestal (8) inner side and outer side.
High temperature valve seat bush production technology the most according to claim 8, its feature exists
In, described baffle plate (821) is provided with an arc groove (821a), and arc groove (821a)
With the first shaping wheel body (2) or the second shaping wheel body (3) matched in clearance；Or it is described
Baffle plate (821) be provided with two arc grooves (821a), and one of them arc groove (821a)
With the first shaping wheel body (2) matched in clearance, another arc groove (821a) becomes with second
Type wheel body (3) matched in clearance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410256376.9A CN104015383B (en) | 2014-06-10 | 2014-06-10 | High temperature valve seat bush production technology |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410256376.9A CN104015383B (en) | 2014-06-10 | 2014-06-10 | High temperature valve seat bush production technology |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104015383A CN104015383A (en) | 2014-09-03 |
| CN104015383B true CN104015383B (en) | 2016-08-24 |
Family
ID=51432525
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410256376.9A Active CN104015383B (en) | 2014-06-10 | 2014-06-10 | High temperature valve seat bush production technology |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104015383B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112692089A (en) * | 2020-12-28 | 2021-04-23 | 滁州沃博自动化科技有限公司 | Valve seat of aluminum vehicle-mounted pendulum oil-free air compressor and manufacturing method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5431619A (en) * | 1993-05-25 | 1995-07-11 | Sonoco Products Company | Process and apparatus for forming an outwardly curled lip on cylindrical container body |
| CN2312368Y (en) * | 1997-10-13 | 1999-03-31 | 赵学古 | Central line, single spherical surface and full polytetrafluoretylene lining buttlerfly valve |
| US20030224083A1 (en) * | 2002-05-30 | 2003-12-04 | Fa-Shi Tseng | Molding device for molding an inner end portion of a paper pipe |
| CN201575180U (en) * | 2009-12-29 | 2010-09-08 | 陈沛 | Novel valve core |
-
2014
- 2014-06-10 CN CN201410256376.9A patent/CN104015383B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5431619A (en) * | 1993-05-25 | 1995-07-11 | Sonoco Products Company | Process and apparatus for forming an outwardly curled lip on cylindrical container body |
| CN2312368Y (en) * | 1997-10-13 | 1999-03-31 | 赵学古 | Central line, single spherical surface and full polytetrafluoretylene lining buttlerfly valve |
| US20030224083A1 (en) * | 2002-05-30 | 2003-12-04 | Fa-Shi Tseng | Molding device for molding an inner end portion of a paper pipe |
| CN201575180U (en) * | 2009-12-29 | 2010-09-08 | 陈沛 | Novel valve core |
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| Publication number | Publication date |
|---|---|
| CN104015383A (en) | 2014-09-03 |
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