CN106694639A - Sheet metal stamping device - Google Patents

Sheet metal stamping device Download PDF

Info

Publication number
CN106694639A
CN106694639A CN201611252740.XA CN201611252740A CN106694639A CN 106694639 A CN106694639 A CN 106694639A CN 201611252740 A CN201611252740 A CN 201611252740A CN 106694639 A CN106694639 A CN 106694639A
Authority
CN
China
Prior art keywords
gag lever
lever post
board
hole
rotating shaft
Prior art date
Application number
CN201611252740.XA
Other languages
Chinese (zh)
Other versions
CN106694639B (en
Inventor
万贤平
Original Assignee
重庆大友金属有限责任公司
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by 重庆大友金属有限责任公司 filed Critical 重庆大友金属有限责任公司
Priority to CN201611252740.XA priority Critical patent/CN106694639B/en
Publication of CN106694639A publication Critical patent/CN106694639A/en
Application granted granted Critical
Publication of CN106694639B publication Critical patent/CN106694639B/en

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21DWORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D5/00Bending sheet metal along straight lines, e.g. to form simple curves
    • B21D5/002Positioning devices
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21CMANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C51/00Measuring, gauging, indicating, counting, or marking devices specially adapted for use in the production or manipulation of material in accordance with subclasses B21B - B21F
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21DWORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D37/00Tools as parts of machines covered by this subclass
    • B21D37/16Heating or cooling
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21DWORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D5/00Bending sheet metal along straight lines, e.g. to form simple curves
    • B21D5/02Bending sheet metal along straight lines, e.g. to form simple curves on press brakes without making use of clamping means
    • B21D5/0209Tools therefor

Abstract

The invention relates to the field of machining, and particularly discloses a sheet metal stamping device which comprises a hydraulic pressure platform, a rack, sealing elements and a machine platform which are connected from top to bottom, wherein an upper die is detachably mounted on the lower surface of the hydraulic pressure platform; a rotating shaft rotatably connected with the machine platform is horizontally arranged on the machine platform; a plurality of lower dies of different models are circumferentially mounted on the rotating shaft; the lower dies are perpendicular to the rotating shaft; the sheet metal stamping device further comprises a hollow limiting rod; the limiting rod penetrates through the lower dies to be detachably connected with the machine platform; a first through hole is formed in the center of each of the lower dies; a second through hole allowing the limiting rod to be communicated with the first through holes is formed in the limiting rod; the sealing elements are fixedly mounted at the lower ends of the first through holes; a water inlet and a water outlet are formed in the limiting rod; a laser generator is arranged at the water inlet, a transparent glass reinforced plastic pipe is sleeved and connected with each of the limiting rod and the first through holes, and the outer walls of the glass reinforced plastic pipes are in contact with the inner walls of the limiting rod and the first through holes. According to the sheet metal stamping device provided by the invention, the lower dies can be quickly replaced; therefore, the processing efficiency is improved.

Description

Metal sheet decompressor
Technical field
The invention belongs to field of machining, and in particular to a kind of bending device of metal sheet.
Background technology
The features such as sheet metal component has lightweight, intensity high, low cost, good scale of mass production performance, in electronic apparatus, leads to The fields such as letter, auto industry, medicine equipment are widely applied.Particularly in computer housing, mobile phone, MP3, the metal of tabular It is essential part.As the application of sheet metal component is more and more extensive, the demand of sheet metal component is also increasing, processing The requirement of precision also more and more higher.
In sheet metal component process, mainly bender mould is placed on stamping machine, is then placed into metal sheet Metal sheet is bent in bending mold, in bending process, the active force between upper and lower mould is put on metal sheet, Metal sheet is produced plastic deformation, different upper die and lower die are selected according to the shape of sheet metal component in processing, work as metal When plate is more complicated, the shape of bending is also more complicated, now needs frequently to change mold and lower mould, the mistake of replacing What journey compared wastes time and energy;And in process, work piece can the heat production after plastic deformation, now decontrol work piece, The rebound performance of work piece is most strong, can cause the precision of the sheet metal component after machining and reduce.
The content of the invention
The invention is intended to provide a kind of metal sheet decompressor, to realize the quick replacement of lower mould, processing effect is improved Rate.
In order to achieve the above object, base case of the invention is as follows:A kind of metal sheet decompressor, including by up to Under the hydraulic pressure platform, frame and the board that are sequentially connected, the hydraulic pressure platform is slidably connected with the upper end of frame, the lower end of frame and board It is fixedly connected, and hydraulic pressure platform is arranged on the surface of board, is detachably provided with mold on the lower surface of the hydraulic pressure platform, institute The rotating shaft for being horizontally disposed with board and having and rotated with board and be connected is stated, and the lower mould of some different models is circumferentially installed in rotating shaft Tool, lower mould is vertical with rotating shaft, and mold is set towards rotating shaft;Also include hollow gag lever post, the gag lever post is passed through Lower mould is detachably connected with board, and gag lever post is horizontally disposed;The center of the lower mould is provided with first through hole, and spacing The second through hole of gag lever post and first through hole is communicated with bar, also including annular seal, the seal is fixedly mounted on First through hole lower end;One end of the gag lever post is provided with blasthole, and the other end of gag lever post is provided with apopore, at blasthole Be provided with laser generator, be socketed with transparent glass reinforced plastic pipe in the gag lever post and first through hole, and glass reinforced plastic pipe outer wall Inwall with gag lever post and first through hole is contacted, and the upper end of first through hole is provided with transparent glass epoxy.
The principle of base case:Before operation, start hydraulic pressure platform, moved on hydraulic pressure platform, mold on hydraulic pressure platform lower surface with Lower mould is separated, and then dismantles the gag lever post on board, removes gag lever post;Then rotating shaft, rotating shaft is driven in rotating shaft Lower mold rotation, now selects required lower mould, then by corresponding lower mold rotation to the underface of mold, under making Mould is relative with mold, and gag lever post then is passed through into lower mould, and the two ends of gag lever post are connected with board, now make first through hole Relative with the second through hole, the seal at first through hole is contacted with the second through hole, first through hole is sealed with the second through hole;Then To water flowing at the blasthole of gag lever post, water is now also contained in first through hole, open laser generator, now the glass in gag lever post Glass steel pipe is reflected light, is totally reflected in water with the time, and light travels to the second through hole, first from gag lever post Glass reinforced plastic pipe in through hole proceeds reflection to light, and the light after reflection is gathered in shape on the glass epoxy of the upper end of first through hole Into luminous point;Then work piece is placed on lower mould, makes the light in the center of the folding line of work piece and first through hole Point is overlapped, and then starts hydraulic pressure platform, and hydraulic pressure platform is moved down, and mold overlaps with lower mould, and work piece is bent, and now flows Water is cooled down to work piece;Then moved on hydraulic pressure platform, take out work piece, be further continued for the processing of next workpiece.
The advantage of base case:The 1st, the lower mould of some different models is circumferentially installed in rotating shaft, and rotating shaft can be with respect to machine Platform is rotated, and lower mold rotation can be driven during rotation, selects different lower moulds relative with mold, it is to avoid to lower mould The replacing for being capable of achieving lower mould is dismounted, the process of replacing is very simple and quick, can reduce replacing construction, improved processing effect Rate;2nd, when gag lever post passes through lower mould, lower mould is relative with mold, so effectively lower mould can be carried out it is spacing, it is anti- Rotating shaft is rocked when only processing, the stability of intensifier;3rd, water inlet and apopore are respectively equipped with the two ends of gag lever post, while Gag lever post is provided with the second through hole connected with first through hole, the heat quilt that work piece and lower mould are produced in process Water is taken away, and is easy to reduce work piece quick cooling and shaping the rebound performance of work piece, improves machining accuracy;4th, it is spacing Transparent glass reinforced plastic pipe is equipped with bar and first through hole, effectively the light that laser generator is produced can be reflected, it is to avoid Light decrease fast;The glass epoxy that the upper end of first through hole is set, can make light in first through hole internal reflection, and light is reflected in fiberglass On plate, light, light-transmissive workpiece with holes are have accumulated on glass epoxy, and then conveniently work piece with holes is positioned.
Whole device realizes the conversion of lower mould by quick rotation, eliminates the process that mould is constantly dismounted, effectively Improve the quick band of the water energy in processing efficiency, and gag lever post and go down the heat that mould and work piece are produced in process Amount, quickly by work piece cooling and shaping, reduces the rebound performance of work piece, improves machining accuracy.
Preferred scheme one:Based on scheme preferred scheme, also including geometrical clamp, the geometrical clamp is fixedly mounted on machine The lower end of platform, and geometrical clamp upper surface and shaft contacts.By above-mentioned setting, in rotating shaft, geometrical clamp connects with rotating shaft Touch, allow the rotation that rotating shaft is smooth, when mold moves down pressing work piece, now can be delivered to for active force by rotating shaft stress On geometrical clamp, and then countershaft is supported, and makes device more stable in process.
Preferred scheme two:Preferably one preferred scheme, is equipped with stopper slot on the two ends of the gag lever post, and Board is provided with the limited block offseted with stopper slot.By above-mentioned setting, when the limited block on board is embedded into stopper slot, limit Position bar can be just fully mounted on board, while first through hole is connected with the second through hole, need not now be rotated further by gag lever post makes the One through hole aligns with the second through hole, simplifies operating procedure, can quickly be adjusted.
Preferred scheme three:Preferably two preferred scheme, two ends and the board of the gag lever post are snapped connection.It is logical Above-mentioned setting is crossed, gag lever post is snapped connection with board, convenience is by the fast quick-detach of gag lever post and board and is quickly connected, can be effective Improve processing efficiency.
Preferred scheme four:Preferably three preferred scheme, also including handle, one end of the rotating shaft passes through board It is fixedly connected with handle.By above-mentioned setting, in rotating shaft, handle can be positioned with buckle then with swing handle, kept away Exempt from rotating shaft to be rotated further, it is convenient to be connected gag lever post with board through lower mould, can be more laborsaving using handle rotating shaft, rotate Also more facilitate.
Brief description of the drawings
Fig. 1 is the structural representation of metal sheet decompressor embodiment of the present invention;
Fig. 2 is the left view of Fig. 1;
Fig. 3 is partial sectional view at the A of Fig. 1.
Specific embodiment
Below by specific embodiment, the present invention is further detailed explanation:
Reference in Figure of description includes:Hydraulic pressure platform 10, mold 101, frame 20, rotating shaft 30, lower mould 301, One through hole 311, geometrical clamp 302, the buckle 304 of handle 303, fixed handle, gag lever post 40, laser generator 401, blasthole 402nd, apopore 403, the second through hole 404, board 50, limited block 501, glass reinforced plastic pipe 60, glass epoxy 601, seal 70.
Embodiment is basic as shown in accompanying drawing 1, accompanying drawing 2 and accompanying drawing 3:A kind of metal sheet decompressor, including from top to bottom Hydraulic pressure platform 10, frame 20, board 50, the hollow gag lever post 40 and geometrical clamp 302 being sequentially connected.The upper end of frame 20 and hydraulic pressure Platform 10 is slidably connected, and the lower end of frame 20 is fixedly connected with board 50, and hydraulic pressure platform 10 is arranged on the surface of board 50, hydraulic pressure Mold 101 detachably is installed on the lower surface of platform 10, lower mould 301 is vertical with the lower surface of hydraulic pressure platform 10.
The rotating shaft 30 for having and being rotated with board 50 and be connected is horizontally disposed with board 50, and four are circumferentially provided with rotating shaft 30 not The lower mould 301 of same model, lower mould 301 is vertical with rotating shaft 30, and mold 101 is oppositely arranged with lower mould 301;It is fixed Folder 302 is fixedly mounted on the lower end of board 50, and the upper surface of geometrical clamp 302 contacts with the outer surface of rotating shaft 30;The mistake of rotation Cheng Zhongke drives lower mould 301 to rotate, and selects different lower moulds 301 relative with mold 101, it is to avoid to enter to lower mould 301 Row dismounting is capable of achieving the replacing of lower mould 301, and the process of replacing is very simple and quick.
The left end of gag lever post 40 is snapped connection with the side of board 50, and the right-hand member of gag lever post 40 passes through lower mould 301 and machine The opposite side of platform 50 is snapped connection, gag lever post 40 and rotating shaft 30 parallel and on same perpendicular, the center of lower mould 301 Place is provided with first through hole 311, and the centre of gag lever post 40 is provided with the second through hole 404, and the through hole 404 of first through hole 311 and second Overlap, the lower end of first through hole 311 is provided with the seal 70 of the ring-type for elastomeric material;Gag lever post 40 can be to lower mould 301 Carry out spacing, while when gag lever post 40 is passed through water, water energy is entered into first through hole 311, make process reclaimed water to being added Workpiece and lower mould 301 are cooled down.
The left end of gag lever post 40 is provided with blasthole 402, and the right-hand member of gag lever post 40 is provided with apopore 403, and gag lever post Laser generator 401 is provided with the blasthole 402 of 40 left ends;The left end of gag lever post 40 is provided with stopper slot, and board 50 and sets There is the limited block 501 offseted with stopper slot, the installation direction of gag lever post 40 can be carried out spacing.
Be socketed with transparent glass reinforced plastic pipe 60 in gag lever post 40 and first through hole 311, and the outer wall of glass reinforced plastic pipe 60 with The inwall of gag lever post 40 and first through hole 311 is contacted, and the upper end of first through hole 311 is provided with transparent glass epoxy 601, and Glass epoxy 601 is fixedly connected with lower mould 301, effectively the light that laser generator 401 is produced can be reflected, it is to avoid light Decrease fast;The light also helped on glass epoxy 601 is assembled to form luminous point, and work piece is positioned.
Additionally, handle 303 is annular shape, the left end of rotating shaft 30 is fixedly connected through board 50 with handle 303;Buckle is fixed On the left lateral sides face of board 50, and buckle is relative with putting for handle 303, and buckle is positioned to handle 303, it is to avoid rotating shaft 30 are rotated further, convenient to install gag lever post 40.
In the present embodiment, before operation, start hydraulic pressure platform 10, moved on hydraulic pressure platform 10, the mold on the lower surface of hydraulic pressure platform 10 101 are separated with lower mould 301, and then the two ends of gag lever post 40 are dismantled from board 50, remove gag lever post 40;Unclamp handle Buckle on 303, swing handle 303, the handle 303 of rotation drives rotating shaft 30 to rotate, and rotating shaft 30 drives the lower mould in rotating shaft 30 Tool 301 is rotated, and lower mould 301 is now selected as needed, and corresponding lower mould 301 then is being turned into mold 101 just Lower section, makes lower mould 301 be located relatively at same vertical axis with mold 101, then with buckle fixed handle 303, Jin Ergu Determine rotating shaft 30, rotating shaft 30 is not rotated further by;Then gag lever post 40 is sequentially passed through left side, lower mould 301 and the board 50 of board 50 Right side, the two ends of gag lever post 40 are connected with board 50, now limited block 501 is embedded into stopper slot, while making first The through hole 404 of through hole 311 and second is relative, and the seal 70 at first through hole 311 is contacted with the second through hole 404, makes first through hole 311 seal with the second through hole 404;The laser generator 401 in gag lever post 40 is then turned on, now the fiberglass in gag lever post 40 60 pairs of light of pipe are reflected, and are totally reflected in water with the time, and light is traveled at the second through hole 404 from gag lever post 40, 60 pairs of light of glass reinforced plastic pipe in first through hole 311 proceed reflection, and the light after reflection is gathered in the upper end of first through hole 311 On glass epoxy 601, the luminous point spacing to work piece is formed;Then work piece is placed on lower mould 301, makes to be added The center of the folding line of workpiece is Chong Die with the luminous point in first through hole 311, then starts hydraulic pressure platform 10, and hydraulic pressure platform 10 is moved down, on Mould 101 is overlapped with lower mould 301, and work piece is bent, and the water for now flowing is cooled down to work piece;Then hydraulic pressure Moved on platform 10, take out work piece, be further continued for the processing of next workpiece.
Above-described is only embodiments of the invention, and the general knowledge such as known concrete structure and/or characteristic is herein in scheme Excessive description is not made.It should be pointed out that for a person skilled in the art, on the premise of structure of the present invention is not departed from, also Some deformations and improvement can be made, these should also be considered as protection scope of the present invention, these are real all without the influence present invention The effect and practical applicability applied.This application claims protection domain should be defined by the content of its claim, specification In specific embodiment etc. record the content that can be used for explaining claim.

Claims (5)

1. a kind of metal sheet decompressor, including hydraulic pressure platform, frame and the board being from top to bottom sequentially connected, the hydraulic pressure platform Upper end with frame is slidably connected, and the lower end of frame is fixedly connected with board, and hydraulic pressure platform is arranged on the surface of board, and it is special Levy and be, mold detachably is installed on the lower surface of the hydraulic pressure platform, being horizontally disposed with the board has and board rotation The rotating shaft of connection, and the lower mould of some different models is circumferentially installed in rotating shaft, and mold is set towards rotating shaft, and lower mould The axis of tool is vertical with the axis of rotating shaft;Also include hollow gag lever post, the gag lever post is detachable with board through lower mould Connection, and gag lever post is horizontally disposed;The center of the lower mould is provided with and gag lever post is communicated with first through hole, and gag lever post With the second through hole of first through hole, also including annular seal, the seal is fixedly mounted on first through hole lower end;The limit One end of position bar is provided with blasthole, and the other end of gag lever post is provided with apopore, laser generator is provided with blasthole, described Be socketed with transparent glass reinforced plastic pipe in gag lever post and first through hole, and glass reinforced plastic pipe outer wall and gag lever post and first through hole Inwall is contacted, and the upper end of first through hole is provided with transparent glass epoxy.
2. metal sheet decompressor according to claim 1, it is characterised in that also including geometrical clamp, the geometrical clamp Be fixedly mounted on the lower end of board, and geometrical clamp upper surface and shaft contacts.
3. metal sheet decompressor according to claim 2, it is characterised in that be equipped with the two ends of the gag lever post Stopper slot, and board is provided with the limited block offseted with stopper slot.
4. metal sheet decompressor according to claim 3, it is characterised in that the two ends of the gag lever post and board card Button connection.
5. metal sheet decompressor according to claim 4, it is characterised in that also including circular handle and fixation The buckle of handle, one end of the rotating shaft is fixedly connected through board with handle, and buckle is fixedly mounted on board, and buckle with Putting for handle is relative.
CN201611252740.XA 2016-12-30 2016-12-30 Metal sheet decompressor CN106694639B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201611252740.XA CN106694639B (en) 2016-12-30 2016-12-30 Metal sheet decompressor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201611252740.XA CN106694639B (en) 2016-12-30 2016-12-30 Metal sheet decompressor

Publications (2)

Publication Number Publication Date
CN106694639A true CN106694639A (en) 2017-05-24
CN106694639B CN106694639B (en) 2018-05-15

Family

ID=58906200

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201611252740.XA CN106694639B (en) 2016-12-30 2016-12-30 Metal sheet decompressor

Country Status (1)

Country Link
CN (1) CN106694639B (en)

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07284843A (en) * 1994-04-21 1995-10-31 Hitachi Metals Ltd Squeeze roll with cooling device for manufacturing welded tube
US5913931A (en) * 1997-11-04 1999-06-22 Ready Technology, Inc. Extended length rotary bending and forming devices and methods for manufacture thereof
KR20050087765A (en) * 2005-08-10 2005-08-31 이영화 Linear induction heating coil tool for plate bending
CN203155811U (en) * 2013-01-24 2013-08-28 沃克斯电梯(中国)有限公司 Lower die conversion device of bending machine
CN103658395A (en) * 2013-11-29 2014-03-26 大连鑫永工业制造有限公司 Water-cooling bending die for auto part machining
CN104525751A (en) * 2015-01-04 2015-04-22 济南铸造锻压机械研究所有限公司 Automatic die rotating and replacing device for bending machine
CN205020575U (en) * 2015-08-17 2016-02-10 安润集团安徽中润重工有限公司 Bending machine
CN105945155A (en) * 2016-07-20 2016-09-21 孔兵 Lower die of bending machine

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07284843A (en) * 1994-04-21 1995-10-31 Hitachi Metals Ltd Squeeze roll with cooling device for manufacturing welded tube
US5913931A (en) * 1997-11-04 1999-06-22 Ready Technology, Inc. Extended length rotary bending and forming devices and methods for manufacture thereof
KR20050087765A (en) * 2005-08-10 2005-08-31 이영화 Linear induction heating coil tool for plate bending
CN203155811U (en) * 2013-01-24 2013-08-28 沃克斯电梯(中国)有限公司 Lower die conversion device of bending machine
CN103658395A (en) * 2013-11-29 2014-03-26 大连鑫永工业制造有限公司 Water-cooling bending die for auto part machining
CN104525751A (en) * 2015-01-04 2015-04-22 济南铸造锻压机械研究所有限公司 Automatic die rotating and replacing device for bending machine
CN205020575U (en) * 2015-08-17 2016-02-10 安润集团安徽中润重工有限公司 Bending machine
CN105945155A (en) * 2016-07-20 2016-09-21 孔兵 Lower die of bending machine

Also Published As

Publication number Publication date
CN106694639B (en) 2018-05-15

Similar Documents

Publication Publication Date Title
CN105537365A (en) Automatic tooth-punching equipment for flat steel used by steel grating plate
CN106799439A (en) For the workpiece stripper apparatus of forcing press
CN205732438U (en) A kind of large hydraulic decompressor
CN205929083U (en) Stone material board perforating device
CN207204917U (en) A kind of metal plate apparatus for bending
CN201596745U (en) Synchronous automatic riveting contact precise positioning device
CN207308863U (en) A kind of forging apparatus
CN106734645B (en) Stamping die fast replacement device
CN103991237A (en) Piston type double-station punching machine with crank connecting rod structure
CN208600604U (en) Stamping device is used in a kind of processing of numerical control gantry machining center shell coaming plate
CN201720320U (en) Continuous punching die device with rotation function
CN105312384A (en) Multifunctional combined hydraulic machine
CN204672736U (en) A kind of efficient sheet material apparatus for shaping
CN104440034A (en) Wheel press fitting device
CN102896192A (en) Stamping device for thin plate
CN204892759U (en) Pipe end flaring device
CN205096436U (en) High accurate crib crimper of high efficiency
CN205074384U (en) Punching machine
CN205200272U (en) Many function combination hydraulic press
CN102847757A (en) Metal plate bending machine
CN103157711B (en) Automobile door taping machine
CN101612801A (en) A kind of handpress
CN203578720U (en) Multi-station vertical die-casting machine
CN206009675U (en) A kind of angle bender
CN101444809B (en) Punching device for bridge plate production line

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant