CN104985063B - Compression ring die - Google Patents
Compression ring die Download PDFInfo
- Publication number
- CN104985063B CN104985063B CN201510482754.XA CN201510482754A CN104985063B CN 104985063 B CN104985063 B CN 104985063B CN 201510482754 A CN201510482754 A CN 201510482754A CN 104985063 B CN104985063 B CN 104985063B
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- China
- Prior art keywords
- jaw
- back plate
- clamping groove
- draw back
- clip
- 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.)
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D39/00—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders
- B21D39/04—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders of tubes with tubes; of tubes with rods
Abstract
The invention provides a compression ring die, belongs to the machinery technical field, and solves the problems that an existing compression ring die cannot conveniently load a to be compressed pipe fitting; the compression ring die comprises an upper jaw, a lower jaw and side jaws respectively arranged on two sides; an outer side of each side jaw is respectively provided with a long strip stay; the top of the stay is hinged to the upper jaw, the middle of the stay is movably connected with the corresponding side jaw, and the bottom is respectively hinged to a push-pull plate in a strip shape; the push-pull plate is provided with a connecting portion protruding from the side portion; the bottom of the lower jaw is provided with a give position slot allowing the connecting portion to insert; two sides of the lower jaw are respectively provided with a cylindrical clamping rods penetrating the give position slot; the connecting portion is provided with a clamping groove with an outer opening side; the clamping rod is clamped into the clamping groove of the corresponding push-pull plate; the connecting portion of the push-pull plate is also provided with a limit structure used for limiting the clamping rod; the compression ring die allows the to be compressed pipe fittings to be conveniently loaded in the compression jaw or to be removed from the compression jaw.
Description
Technical field
The invention belongs to field of mechanical technique, it is related to a kind of card pressure ring mould.
Background technology
Pipe pressing tongs is used for by extruding to pipeline, makes the instrument that pipeline deforms upon.Pipe pressing tongs is used for by extruding
Pipeline junction, makes pipeline junction deform, and realizes the crimping of pipeline, and pipeline connects more reliable, better tightness.
For example, Chinese patent【Application number 201320468114.X；Authorization Notice No. CN 203370961U】Disclosed one kind
Thin-walled stainless steel tube quickly crimps system, and including Press Plier and control device, control device includes power supply supplying module, is provided with
The oil pump body of overvoltage protection, the conversion oil cylinder being connected with oil pump body by oil pipe, conversion oil cylinder and crimp clipper joint, in oil
It is provided with switch in pump main body.
Above-mentioned quick crimping system passes through the extruding to stainless steel pipes for the hydraulic-driven Press Plier realization, thus realizing pipeline
Crimping operation.Again for example, Chinese patent【Application number 201320417406.0；Authorization Notice No. CN203343307U】Disclosed
A kind of ring-pressing tool, including upper jaw, lower jaw, left jaw and right jaw, also includes the tie rod that is symmetrical set and pushes away
Arm-tie；Front draw back plate is triangular in shape, is formed with three pin-and-holes at three drift angles, and the first pin-and-hole is hinged with the end of lower jaw,
Second pin-and-hole is hinged with the bottom of tie rod, and the second pin-and-hole is formed with docking groove；Aforementioned tie rod is elongated, upper end with upper
The end of jaw is hinged, and the middle part of tie rod is connected with two push-pull bars；The outside of aforementioned left/right jaw is formed with around pushing away
The through hole that pull bar slides.
Above-mentioned ring-pressing tool is connected with Power Component (instrument of similar spanner or hydraulic tool), and Power Component drives pincers
Mouth opening/closing, realizes the crimping to pipeline.But, this ring-pressing tool has problems in that, front draw back plate also need to and
Power Component be connected, due to front draw back plate pass through the first pin-and-hole hinged with the end of lower jaw, front draw back plate cannot with
Jaw separates, and draw back plate motion in front is limited by tie rod hinged with front draw back plate respectively and lower jaw, leads to front
The hunting range very little of draw back plate.Jaw space is made to increase it is necessary to open the jaw of Power Component when pressure welding pipe fittings load,
To treat that pressure welding pipe fittings axially load jaw again, Power Component band movable clamp port closure completes crimping action, last Power Component
Band movable clamp port opens again, and the pipe fitting having crimped axially is taken out from jaw.Such mode is so that treat pressure welding pipe fittings
Loading inconvenient.Particularly, the tubular length after crimping is longer, leads to pipe fitting to take out increasingly difficult, have impact on crimping effect
Rate.
Content of the invention
The purpose of the present invention is to there are the problems referred to above for existing technology it is proposed that a kind of card pressure ring mould, solution of the present invention
Technical problem certainly is so that pipe fitting is loaded crimping jaw and take out from crimping jaw more convenient.
The purpose of the present invention can be realized by following technical proposal：A kind of card pressure ring mould, including upper jaw, lower jaw and
It is located at the side jaw of both sides respectively, the outside of each described side jaw is provided with elongated tie rod, described tie rod upper end
Portion is hinged with upper jaw, and middle part is flexibly connected with corresponding side jaw, and bottom is hinged with a draw back plate respectively, and its feature exists
In described draw back plate is in bar shaped, and described draw back plate has the connecting portion protruding from sidepiece, and described lower jaw bottom has for even
The slot to make way that socket part stretches into, described lower jaw both sides are respectively arranged with clip-connecting rod that is cylindrical and passing through slot to make way, described company
The clamping groove that outer end is opening is had on socket part, described clip-connecting rod snaps in the clamping groove of corresponding draw back plate, described pushes away
Position limiting structure for spacing clip-connecting rod is also had on the connecting portion of arm-tie.
This card pressure ring mould is arranged on Power Component, for crimping the materials such as pipeline.When this card pressure ring mould uses, first will move
Power assembly takes off, then applies outside active force to the draw back plate of side, makes the clip-connecting rod being connected on this draw back plate overcome limit
Resistance that bit architecture produces simultaneously departs from clamping groove on this draw back plate, and this draw back plate is separated with lower jaw makes crimping jaw from side
Portion opens.Draw back plate will be pushed to lower jaw, make connecting portion stretch into resigning after crimping workpiece after sidepiece loads crimping jaw
Groove, and so that clip-connecting rod is again snapped in clamping groove.After crimping workpiece loads, card pressure ring mould is driven to move by Power Component
Make, realize crimping.After the completion of crimping, by with above-mentioned when crimping workpiece and load identical mode will crimp jaw and beat from sidepiece
Open, the pipe fitting having crimped is taken out in crimping jaw.The structure of this card pressure ring mould enables pipe fitting to be crimped easily
Load crimping jaw, the pipe fitting having crimped can easily take off in crimping jaw, thus improving the processing effect of card pressure ring mould
Rate.
Preferably, in above-mentioned card pressure ring mould, described lower jaw both sides are respectively provided with guide part, outside described guide part
Surface is arc surface, and the center of circle of the corresponding circular arc line of above-mentioned arc surface is located on the axial line of clip-connecting rod, and described draw back plate has interior
Surface is the guide recess of arc surface, and described guide part can embed the outer surface making guide part in guide recess and guide recess
Inner surface laminating against.The inner surface of the outer surface of guide part and guide recess is arc surface, by both cooperations to push-and-pull
Plate plays guide effect with respect to the push-and-pull campaign of lower jaw so that when draw back plate is dismounted with lower jaw, the position of draw back plate is more
Easily hold, reduce dismounting difficulty；And, such structure, during the use of card pressure ring mould, can to draw back plate relatively
Guide effect is played in oscillating motion in lower jaw, it is to avoid draw back plate be subject to outside component excessive lead to detached with lower jaw
Situation, overcomes the problem of the safety in utilization decline that draw back plate is led to lower jaw releasable connection.
As further preferred, in above-mentioned card pressure ring mould, the quantity of described guide recess is two, one of institute
State guide recess and be located above connecting portion, another described guide recess is located at below connecting portion；The quantity of described guide part
For two, described guide part and guide recess position correspond.Two assembling above and below connecting portion is located at by setting
The guide part closing and guide recess, the guide effect during further increasing dismounting and using.
In above-mentioned card pressure ring mould, described position limiting structure includes the stop screw positioned at clamping groove both sides, described limit
Position screw passes through the inner end of clamping groove to have tapered locating surface, and the stop screw when clip-connecting rod snaps in clamping groove
Locating surface be resisted against on the outer peripheral face of clip-connecting rod.Position-limiting action is played to clip-connecting rod by stop screw, certain by applying
Pulling force can make clip-connecting rod depart from clamping groove；During installation, clip-connecting rod can be made again to snap in clamping by the thrust applying certain
Groove, draw back plate is separated with lower jaw and cooperation is easier, so that clamping ring mould is more convenient with the connection of Power Component.
Alternatively, in above-mentioned card pressure ring mould, described connecting portion is made using elastomeric material, described spacing
Structure includes the spacing preiection positioned at clamping groove two ends, and described spacing preiection inner surface is in arc surface, and when clip-connecting rod snaps in
During clamping groove, the inner surface of spacing preiection and the outer peripheral face of clip-connecting rod lean.
Preferably, in above-mentioned card pressure ring mould, there is at the opening of described clamping groove the guiding surface of inclination.If
Put guiding surface so that clip-connecting rod is easier to snap in clamping groove.
Compared with prior art, the advantage of this card pressure ring mould is, by the clamping groove on draw back plate and lower jaw
Clip-connecting rod clamping so that draw back plate can be separated with lower jaw, make crimping jaw from sidepiece open, conveniently treat pressure welding pipe fittings side
Just loading crimps jaw and takes out from crimping jaw with the pipe fitting having crimped, and improves crimping efficiency.By position limiting structure to clamping
Post carries out spacing, it is to avoid during card pressure ring mould uses, clip-connecting rod depart from clamping groove lead to draw back plate with crimp jaw
Detached fault occurs.
Brief description
Fig. 1 is the structural representation of this card pressure ring mould in embodiment one.
Fig. 2 is the cross section structure diagram of this card pressure ring mould in embodiment one.
Fig. 3 is the structural representation of this card pressure ring mould draw back plate in embodiment one.
Fig. 4 is the attachment structure schematic diagram of this card pressure ring mould and Power Component in embodiment one.
Fig. 5 is the structural representation of this card pressure ring mould in embodiment two.
Fig. 6 is the structural representation of this card pressure ring mould draw back plate in embodiment two.
In figure, 1, upper jaw；2nd, lower jaw；21st, slot to make way；22nd, guide part；3rd, side jaw；4th, tie rod；5th, draw back plate；
51st, connecting portion；511st, clamping groove；512nd, guiding surface；52nd, guide recess；6th, clip-connecting rod；7th, stop screw；71st, position
Face；8th, Power Component；81st, union joint.
Specific embodiment
The following is the specific embodiment of the present invention and combine accompanying drawing, technical scheme is further described,
But the present invention is not limited to these embodiments.
Embodiment one：
This card pressure ring mould includes upper jaw 1, lower jaw 2, side jaw 3, tie rod 4, draw back plate 5, connecting portion 51, clamping groove
511st, clip-connecting rod 6 and position limiting structure.
Specifically, as shown in figure 1, the quantity of side jaw 3 is two, two side jaws 3 be located at respectively upper jaw 1 and under
The both sides of jaw 2, upper jaw 1, lower jaw 2 and the adjacent position of side jaw 3 can be bonded to each other and form pressure in centre position
Connect jaw.The outside of each side jaw 3 is provided with elongated tie rod 4, and tie rod 4 upper end is hinged with upper jaw 1, middle part
It is flexibly connected with corresponding side jaw 3, bottom is hinged with the draw back plate 5 of correspondence position respectively.By applying on draw back plate 5
Plus active force, upper jaw 1, lower jaw 2 and side jaw 3 can be driven to move, change the shape of crimping jaw, and to placement and pressure
The parts to be processed connecing jaw is extruded.
As shown in figure 3, draw back plate 5 is in bar shaped, draw back plate 5 has the connecting portion 51 protruding from sidepiece, on connecting portion 51
There is clamping groove 511, preferably, there is at the opening of clamping groove 511 guiding surface 512 of inclination.As Fig. 1 and
Shown in Fig. 2, lower jaw 2 bottom has the slot to make way 21 stretching into for connecting portion 51, and lower jaw 2 both sides are respectively arranged with recessed with clamping
Groove 511 position one-to-one corresponding and the clip-connecting rod 6 of mating shapes, clip-connecting rod 6 passes through slot to make way 21 and can snap in corresponding clamping
In groove 511.In the present embodiment, clip-connecting rod 6 is in cylinder, and the outer peripheral face at clip-connecting rod 6 two ends is respectively provided with determining ringwise
Position groove, is snapped in the jump ring of detent and the two sides of lower jaw 2 leans, so that clip-connecting rod 6 is positioned with lower jaw 2.As
Preferred version, the inner face of clamping groove 511 is arc surface, and the center of circle of the corresponding circular arc line of arc surface is located at the axle center of clip-connecting rod 6
So that clamping groove 511 is bigger with the contact surface of clip-connecting rod 6 on line, improve the positional precision of clip-connecting rod 6.
As shown in figure 3, also having position limiting structure on the connecting portion 51 of draw back plate 5, position limiting structure is used for limiting clip-connecting rod 6
Position, when clip-connecting rod 6 departs from or all can produce resistance to clip-connecting rod 6 during snapping in clamping groove 511.The present embodiment
In, position limiting structure includes the stop screw 7 positioned at clamping groove 511 both sides, and stop screw 7 passes through the inner of clamping groove 511
Portion has tapered locating surface 71, and when clip-connecting rod 6 snaps in clamping groove 511, the locating surface 71 of stop screw 7 is resisted against card
Connect on the outer peripheral face of post 6.Stop screw 7 plays position-limiting action to clip-connecting rod 6, can make clip-connecting rod 6 by the pulling force applying certain
Depart from clamping groove 511；During installation, clip-connecting rod 6 can be made again to snap in clamping groove 511, push-and-pull by the thrust applying certain
Plate 5 is easier with the dismounting of lower jaw 2.
As shown in figure 4, an embodiment being connected with Power Component 8 as card pressure ring mould, Power Component 8 include two with
The corresponding union joint 81 of draw back plate 5, Power Component 8 is connected with card pressure ring mould by union joint 81, and union joint 81 can drive push-and-pull
Plate 5 motion makes the clamping jaw of card pressure ring mould treat to press-fit pipe fitting to apply active force, realizes crimping.
The operation principle of this card pressure ring mould is：During use, first Power Component 8 is taken off, then the draw back plate 5 of side is applied
Outside active force, makes the clip-connecting rod 6 being connected on this draw back plate 5 overcome the resistance of stop screw 7 and depart from 5 on this draw back plate
Clamping groove 511, this draw back plate 5 separate with lower jaw 2 make crimping jaw from sidepiece open.Workpiece to be crimped is filled from sidepiece
Enter after crimping jaw, draw back plate 5 is pushed to lower jaw 2, make connecting portion 51 stretch into slot to make way 21, and so that clip-connecting rod 6 is again blocked
Enter in clamping groove 511.After crimping workpiece loads, card pressure ring mould action is driven by Power Component, realizes crimping.Crimp
Cheng Hou, by with above-mentioned wait crimp workpiece load when identical mode by crimp jaw open from sidepiece, by the pipe fitting having crimped
Take out in crimping jaw.
Embodiment two：
Technical scheme in the present embodiment is essentially identical with the technical scheme in embodiment one, and difference is, this reality
Apply in example, as shown in Figure 5 and Figure 6, lower jaw 2 both sides are respectively provided with guide part 22, guide part 22 outer surface is arc surface, circular arc
The center of circle of the corresponding circular arc line in face is located on the axial line of clip-connecting rod 6, and draw back plate 5 has the guide recess that inner surface is arc surface
52, guide part 22 can embed make the outer surface of guide part 22 in guide recess 52 and the inner surface of guide recess 52 fit against.
Preferably, the quantity of guide recess 52 is two, and one of guide recess 52 is located on connecting portion 51
Side, another guide recess 52 is located at below connecting portion 51, and the quantity of guide part 22 is also two, guide part 22 and guide recess
52 positions correspond.The inner surface of the outer surface of guide part 22 and guide recess 52 is arc surface, and it is right to be coordinated by both
Draw back plate 5 plays guide effect with respect to the push-and-pull campaign of lower jaw 2 so that in draw back plate 5 and the disassembly process of lower jaw 2,
The position of draw back plate 5 is easier to hold.And, such structure, during the use of card pressure ring mould, can be to draw back plate 5 phase
Guide effect is played in oscillating motion for lower jaw 2, it is to avoid draw back plate 5 is subject to that outside component is excessive to be led to and lower jaw 2
Detached situation, overcomes the problem of the safety in utilization decline that draw back plate 5 is led to lower jaw 2 releasable connection.
Embodiment three：
Technical scheme in the present embodiment is essentially identical with the technical scheme in embodiment one, and difference is, this reality
Apply in example, connecting portion 51 is made using elastomeric material, position limiting structure includes the spacing preiection positioned at clamping groove 511 two ends, limit
Position convex inner surface is in arc surface, and the inner surface of spacing preiection and clip-connecting rod 6 when clip-connecting rod 6 snaps in clamping groove 511
Outer peripheral face leans.
Specific embodiment described herein is only explanation for example to present invention spirit.The affiliated technology of the present invention is led
The technical staff in domain can be made various modifications or supplement or replaced using similar mode to described specific embodiment
Generation, but the spirit without departing from the present invention or surmount scope defined in appended claims.
Although more employ herein upper jaw 1, lower jaw 2, slot to make way 21, guide part 22, side jaw 3, tie rod 4,
Draw back plate 5, connecting portion 51, clamping groove 511, guiding surface 512, guide recess 52, clip-connecting rod 6, stop screw 7, locating surface
71st, the term such as Power Component 8, union joint 81, but it is not precluded from the probability using other terms.Using these terms it is only
In order to more easily describe and explain the essence of the present invention；Being construed as any additional restriction is all and the present invention
Spirit is contrary.
Claims (6)
1. a kind of card pressure ring mould, including upper jaw (1), lower jaw (2) and the side jaw (3) being located at both sides respectively, described in each
The outside of side jaw (3) is provided with elongated tie rod (4), and described tie rod (4) upper end is hinged with upper jaw (1), in
Portion and corresponding side jaw (3) are flexibly connected, and bottom is hinged with a draw back plate (5) respectively it is characterised in that described draw back plate
(5) it is in bar shaped, described draw back plate (5) has the connecting portion (51) protruding from sidepiece, described lower jaw (2) bottom has for even
The slot to make way (21) that socket part (51) stretches into, described lower jaw (2) both sides are respectively arranged with cylinder and pass through slot to make way (21)
Clip-connecting rod (6), described connecting portion (51) has the clamping groove (511) that outer end is opening, described clip-connecting rod (6) snaps in
In the clamping groove (511) of corresponding draw back plate (5), the connecting portion (51) of described draw back plate (5) also has for spacing clamping
The position limiting structure of post (6).
2. card pressure ring mould according to claim 1 is it is characterised in that described lower jaw (2) both sides are respectively provided with guide part
(22), described guide part (22) outer surface is arc surface, and the center of circle of the corresponding circular arc line of above-mentioned arc surface is located at the axle of clip-connecting rod (6)
On heart line, described draw back plate (5) has the guide recess (52) that inner surface is arc surface, and described guide part (22) can embed guiding
Make the outer surface of guide part (22) in recess (52) and the inner surface of guide recess (52) fit against.
3. card pressure ring mould according to claim 2 it is characterised in that described guide recess (52) quantity be two, its
In described guide recess (52) be located above connecting portion (51), another described guide recess (52) is located at connecting portion (51)
Lower section；The quantity of described guide part (22) is also two, and described guide part (22) and guide recess (52) position correspond.
4. the card pressure ring mould according to claim 1 or 2 or 3 it is characterised in that described position limiting structure include recessed positioned at clamping
The stop screw (7) of groove (511) both sides, it is tapered that described stop screw (7) passes through the inner end of clamping groove (511) to have
Locating surface (71), and the locating surface (71) of stop screw (7) is resisted against clamping when clip-connecting rod (6) snaps in clamping groove (511)
On the outer peripheral face of post (6).
5. the card pressure ring mould according to claim 1 or 2 or 3 is it is characterised in that described connecting portion (51) adopts elastomeric material
Make, described position limiting structure includes the spacing preiection positioned at clamping groove (511) two ends, described spacing preiection inner surface is in circular arc
Face, and the inner surface of spacing preiection and the outer peripheral face of clip-connecting rod (6) lean when clip-connecting rod (6) snaps in clamping groove (511).
6. the card pressure ring mould according to claim 1 or 2 or 3 is it is characterised in that at the opening of described clamping groove (511)
There is the guiding surface (512) of inclination.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510482754.XA CN104985063B (en) | 2015-08-08 | 2015-08-08 | Compression ring die |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510482754.XA CN104985063B (en) | 2015-08-08 | 2015-08-08 | Compression ring die |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104985063A CN104985063A (en) | 2015-10-21 |
| CN104985063B true CN104985063B (en) | 2017-02-15 |
Family
ID=54297023
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510482754.XA Active CN104985063B (en) | 2015-08-08 | 2015-08-08 | Compression ring die |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104985063B (en) |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4240427C1 (en) * | 1992-12-02 | 1994-01-20 | Novopress Gmbh | Press tool |
| DE50205843D1 (en) * | 2001-12-08 | 2006-04-20 | Klauke Gmbh Gustav | PRESS DEVICE |
| DE102006050427A1 (en) * | 2006-08-22 | 2008-02-28 | Gustav Klauke Gmbh | Method for pressing a press fitting and pressing tool for this purpose |
| CN201310459Y (en) * | 2008-11-28 | 2009-09-16 | 杭州中冷机电有限公司 | Bi-parting card connection ball connecting rod of refrigerant compressor |
| KR20120015192A (en) * | 2010-08-11 | 2012-02-21 | 배승범 | Pressing tool for pressing type pipe |
| DE102011052852A1 (en) * | 2011-08-19 | 2013-02-21 | Gustav Klauke Gmbh | pressing device |
| DE102013104504A1 (en) * | 2013-05-02 | 2014-11-06 | Gustav Klauke Gmbh | Chain-like pressing device |
| CN203343307U (en) * | 2013-07-11 | 2013-12-18 | 林必贵 | Annular pressure tool |
| CN203795757U (en) * | 2014-03-31 | 2014-08-27 | 广州市广京装饰材料有限公司 | Column clamping connection assembly |
| CN204912525U (en) * | 2015-08-08 | 2015-12-30 | 陈瑞峰 | Card clamping ring mould |
-
2015
- 2015-08-08 CN CN201510482754.XA patent/CN104985063B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN104985063A (en) | 2015-10-21 |
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| C14 | Grant of patent or utility model | ||
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| CB03 | Change of inventor or designer information |
Inventor after: Han Langui Inventor after: Li Yubing Inventor after: Chen Ruifeng Inventor after: An Xiaoxu Inventor after: Li Zhanmin Inventor after: Zhou Zhenping Inventor after: Zhang Yi Inventor after: Han Zhengtong Inventor before: Chen Ruifeng |
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| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20180504 Address after: 100161 Fengtai intersection, Fengtai District, Beijing, Room 202, room 139 Patentee after: Zhongtie Electric Bureau Group Co., Ltd. Address before: 317605 Shahe industrial district, Yuhuan County, Taizhou, Zhejiang six Patentee before: Chen Ruifeng |