CN105251819A - Bending and blanking device - Google Patents
Bending and blanking device Download PDFInfo
- Publication number
- CN105251819A CN105251819A CN201510793534.9A CN201510793534A CN105251819A CN 105251819 A CN105251819 A CN 105251819A CN 201510793534 A CN201510793534 A CN 201510793534A CN 105251819 A CN105251819 A CN 105251819A
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- hole
- pedestal
- pipe fitting
- boss
- bending
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- Bending Of Plates, Rods, And Pipes (AREA)
Abstract
The invention discloses a bending and blanking device. The device comprises a base (1), wherein the base (1) is provided with a reference surface (3) for placing a free end of a pipe (2) and rotating the free end of the pipe (2); the base (1) is provided with a boss (4) higher than the reference surface (3) for positioning the other end of the pipe (2); the boss (4) is provided with an opening (5) for accommodating the end part of the pipe (2); the base (1) is provided with a through hole (6) for sliding the bent pipe (2) in the vertical direction; the shape of the through hole (6) is consistent with the bending shape of the pipe (2); and the through hole (6) penetrates through the upper surface and the lower surface of the base (1) in the vertical direction, and is communicated with the opening (5) in the vertical direction. The invention provides the bending and blanking device with low maintenance cost, simple operation and no need of manual pipe taking.
Description
Technical field
The present invention relates to pipe fitting brake techniques field, particularly relate to a kind of device for bending blanking.
Background technology
Current, the bending machine on market mainly comprises CNC tube bending machine, hydraulic pipe bender etc., the problem of high, the complicated operation of ubiquity maintenance cost in the bending machine of prior art.In addition, in prior art, bending machine needs to be placed in bending machine by pipe fitting one by one, also to one by one the pipe fitting of forming be taken out after pipe fitting bending, therefore in taking-up process, if there is the unreliable problem of work in bender causes industrial injury with regard to the easy operating personnel to taking out, that is, also there is the safety problem caused owing to needing manually to get pipe in bending machine of the prior art.
Summary of the invention
The technical problem to be solved in the present invention is, overcomes existing technological deficiency, provides a kind of maintenance cost low, easy and simple to handle and the device for bending blanking without the need to manually getting pipe.
Technical solution of the present invention is, there is provided a kind of device for bending blanking with following structure: comprise pedestal, pedestal is provided with for the datum level placing pipe fitting free end and rotate for pipe fitting free end, pedestal is provided with the boss of locating for pipe fitting the other end higher than datum level, and boss is provided with the opening for accommodating pipe fitting end; Described pedestal is vertically provided with the through hole that the pipe fitting after for bending vertically slides, shape of through holes is consistent with the shape after pipe fitting bending, through hole vertically through pedestal upper surface and lower surface and through hole vertically with open communication, through hole comprises the first through hole be positioned at immediately below boss and the second through hole be positioned at outside boss, and the first through hole is communicated with by arc-shaped through-hole with the second through hole; Sidewall near boss side on the perpendicular crossing with datum level and the second through hole on boss is in same perpendicular; Described pedestal slidably connects and extracts to remove the straight pin to the constraint of pipe fitting one end with support tubes one end or from through hole for stretching into through hole, straight pin is arranged on and is positioned at position immediately below boss, and straight pin top edge and datum level are in same level; Described pedestal is provided with accommodating straight pin and the blind hole of sliding for straight pin, and be provided with the first extension spring between straight pin and blind via bottom, straight pin is extended with slide bar outside pedestal, and sliding bar is connected in pedestal and slide bar is provided with linear gear rack; A pair intermeshing first gear and the second gear is rotatably connected to, the linear gear rack engaged transmission on the first gear and slide bar in described pedestal; Pedestal is rotatably connected to ratchet, ratchet one end and the second gear clamping or disengagement, and near being connected with the second extension spring be connected to for ratchet on the second gear between the end of the second gear and pedestal on ratchet; On boss near the region of perpendicular slidably connect for bending after the push rod that pushes against of pipe fitting, boss is provided with for accommodating push rod and the stepped hole slided for push rod, push rod periphery wall is provided with annular protrusion, stage clip is provided with between annular protrusion on the step surface of stepped hole and push rod, stepped hole opening part is combined with nut to be locked in stepped hole by the annular protrusion on push rod, end away from the second gear on push rod one end and ratchet pushes against, and the other end stretches out boss or is contracted in boss; Described pedestal is rotatably connected to for pipe fitting is bent into the flap consistent with shape of through holes, flap comprises for the curved portions of moulding pipe bending region and the line part for moulding pipe linearity region, pedestal is connected with the hydraulic machine for driving flap to rotate, drift on hydraulic machine contacts with the line part on flap, and is connected with the 3rd extension spring between line part on flap and pedestal; Described pedestal is provided with stopping means spacing when resetting for flap.
The present invention is placed on by pipe fitting one end in the opening on boss, and the other end lies in a horizontal plane on datum level, so just can position a rectilinear pipe fitting; Wherein, support limit is carried out by straight pin below the pipe fitting end being positioned at opening; Subsequent, the drift work on hydraulic machine is rotated to drive flap, and then pipe fitting is bent into the shape consistent with shape of through holes by flap, and namely pipe fitting one end is in the opening on boss all the time, is close on the perpendicular on boss after other end bending; Pipe fitting bending is when the perpendicular of boss, and pipe fitting inner wall can promote push rod and slide to make ratchet and second be out of gear, and namely removes ratchet to the constraint of the second gear; Straight pin to be contracted in blind hole thus to relieve the supporting role of straight pin for pipe fitting under the drive of the first extension spring subsequently, and the pipe fitting namely after bending is vacant state; Meanwhile, flap resets under the drive of the 3rd extension spring, thus the pipe fitting after bending just can fall along the inwall of through hole.In whole pipe fitting Forging Process, operating personnel only need pipe fitting to be placed on pedestal, in pipe fitting Forging Process, automatic blanking can also be carried out to the pipe fitting after bending, do not need operating personnel to be extend into by hand above pedestal to operate the pipe fitting after bending, namely whole Forging Process is very easy for the operation requirements of operating personnel, and without the need to manually getting pipe, adds the security of pipe fitting bending for operating personnel; Also have, parts involved by structure of the present invention are all a little simple parts, gear, tooth bar are all that standard component can directly be buied in market, the parts such as pedestal, flap, straight pin are all simple structure, the cost of production and processing is low, that is, and these parts otherwise be exactly that purchase cost is low, be exactly that production cost is low, so the cost that structure is being safeguarded in the present invention also decreases in the future.In addition, flap can be made after each reset can both to be in same position by arranging of limited block, after can preventing flap from resetting, cross pedestal outside, namely ensure that flap is contracted within the scope of pedestal and rotate.Therefore, the invention provides low, the easy and simple to handle and device for bending blanking without the need to manually getting pipe of a kind of maintenance cost.
Preferred as one, described stopping means refers to and pedestal is fixedly connected with multiple limited block, and sidewall limited block and flap deviating from pipe fitting pushes against or throws off.Preferred by this, can ensure that flap is positioned at pedestal scope and rotates.
Preferred as one, described limited block has two, and two limited blocks push against with line part on flap simultaneously or depart from.Preferred by this, the active force of flap to each limited block can be reduced, each limited block can be divided equally turn round the active force of plate to limited block.
Preferred as one, described slide bar is slidably connected in pedestal by dovetail groove.Preferred by this, can ensure that slide bar can not depart from from pedestal in sliding process, oat tail groove structure not only can play guide effect to the slip of slide bar, plays spacing effect can also to the slip of sliding.
Preferred as one, the first described extension spring is socketed on slide bar, and first extension spring one end is connected with slide bar junction with straight pin, and the other end is connected with at the bottom of hole.Preferred by this, can ensure the first extension spring uniform force in deformation process, ensure that the first extension spring two ends are connected with straight pin respectively, the other end is connected with blind via bottom, improves the reliability of extension spring work.
Preferred as one, second described extension spring one end is connected with the end near the second gear on ratchet, and the other end is connected with pedestal.Preferred by this, can ensure ratchet hand second tension spring tension effect and with the second gear clamping, prevent the second gear reversion.
Preferred as one, described straight pin has two, and two straight pins are in same level, and two straight pins and slide bar end form a U-shaped structure.Preferably can increase the pipe fitting strong point along its length by this, expand the length range that straight pin supports for pipe fitting, make pedestal more reliable for the support of pipe fitting.
Accompanying drawing explanation
Fig. 1 is partial sectional view of the present invention.
Fig. 2 is top view when not placing pipe fitting in the present invention.
Fig. 3 is the structural representation of pedestal in the present invention.
Top view when Fig. 4 is the pipe fitting that placed in the present invention not by bending.
Fig. 5 placed by the top view of bending rear tubular member in the present invention.
Fig. 6 is the structural representation of another angle of pedestal in the present invention.
Shown in figure: 1, pedestal, 2, pipe fitting, 3, datum level, 4, boss, 5, opening, 6, through hole, 7, perpendicular, 8, sidewall, 9, straight pin, 10, first extension spring, 11, blind hole, 12, slide bar, 13, linear gear rack, 14, push rod, 15, stepped hole, 16, annular protrusion, 17, first through hole, 18, second through hole, 19, arc-shaped through-hole, 20, nut, 21, flap, 22, curved portions, 23, line part, 24, drift, 25, first gear, 26, second gear, 27, ratchet, 28, second extension spring, 29, 3rd extension spring, 30, stage clip, 31, limited block.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the invention will be further described.
As shown in the figure, operation principle of the present invention: first, first promote slide bar, until straight pin end abuts to the first through-hole wall, on the one hand can strut the first extension spring in sliding bar process, slide bar can be stirred ratchet by the transmission of linear gear rack and the first gear, the second gear and periodically rotates around a direction on the other hand, and ratchet is under the effect of the second extension spring, can be connected to all the time on the second gear, in case on-slip bar automatically resets; Being placed on pipe fitting one end of non-bending subsequently in the opening on boss and being positioned at the top of straight pin, the other end lies in a horizontal plane in the datum level on pedestal, as shown in Figure 4;
Then, the drift work on hydraulic machine is rotated to drive flap, thus is bent into consistent with shape of through holes to pipe fitting, as shown in Figure 5; In flap rotation process, also can pull open the 3rd extension spring, make the 3rd extension spring distortion to lay in the active force needed for flap reset; After preventing pipe fitting bending, resilience or plastic deformation can occur, drift can continue for some time the active force of flap, such as 1 ~ 3min, specifically continues how long will see the pipe fitting concrete what material is made and determines;
Wherein, in pipe fitting Forging Process, once the push rod ends contact of perpendicular position on pipe fitting inner wall and boss, pipe fitting will push push rod and slide; So push rod will promote ratchet rotation to remove the constraint of ratchet to the second gear; Subsequently, straight pin can slide under the pulling force effect of the first extension spring, and departs from the first through hole, is contracted in blind hole, namely relieves supporting role pipe fitting being positioned to open area;
Meanwhile, drift also can terminate active force to flap and retracted for clearance, and flap can rotate backward reset under the pulling force effect of the 3rd extension spring; And be all in same position after flap resets, after namely flap resets, on flap, the outer wall of line part is resisted against on limited block at every turn;
Finally, the pipe fitting after bending had not both had the supporting role of straight pin, did not have the pressure of flap yet, thus the pipe fitting after bending can along the inwall landing of through hole, and namely the pipe fitting after bending departs from the datum level on pedestal and boss.
The device that the present invention is used for bending blanking comprises pedestal 1, pedestal 1 is provided with for the datum level 3 placing pipe fitting 2 free end and rotate for pipe fitting 2 free end, pedestal 1 is provided with the boss 4 of locating for pipe fitting 2 the other end higher than datum level 3, and boss 4 is provided with the opening 5 for accommodating pipe fitting 2 end, described pedestal 1 is vertically provided with the through hole 6 that the pipe fitting 2 after for bending vertically slides, through hole 6 shape is consistent with the shape after pipe fitting 2 bending, through hole 6 vertically through pedestal 1 upper surface with lower surface and through hole 6 be vertically communicated with opening 5, through hole 6 is comprised the first through hole 17 be positioned at immediately below boss 4 and is communicated with by arc-shaped through-hole 19 with the second through hole 18 with the second through hole 18, first through hole 17 be positioned at outside boss 4, boss 4 is in same perpendicular for the sidewall 8 near boss 4 side on the perpendicular 7 crossing with datum level 3 and the second through hole 18, described pedestal 1 slidably connects and extracts to remove the straight pin 9 to the constraint of pipe fitting 2 one end with support tubes 2 one end or from through hole 6 for stretching into through hole 6, straight pin 9 is arranged on and is positioned at position immediately below boss 4, and straight pin 9 top edge and datum level 3 are in same level, described pedestal 1 is provided with accommodating straight pin 9 and the blind hole 11 of sliding for straight pin 9, the first extension spring 10 is provided with between bottom straight pin 9 and blind hole 11, straight pin 9 is extended with slide bar 12 outside pedestal 1, and slide bar 12 is slidably connected in pedestal 1 and slide bar 12 is provided with linear gear rack 13, a pair intermeshing first gear 25 and the second gear 26, first gear 25 and linear gear rack 13 engaged transmission on slide bar 12 is rotatably connected in described pedestal 1, pedestal 1 is rotatably connected to ratchet 27, ratchet 27 one end and the second gear 26 clamping or disengagement, and near being connected with the second extension spring 28 be connected to for ratchet 27 on second gear 26 between the end of the second gear 26 and pedestal 1 on ratchet 27, on boss 4 near the region of perpendicular 7 slidably connect for bending after the push rod 14 that pushes against of pipe fitting 2, boss 4 is provided with for accommodating push rod 14 and the stepped hole 15 slided for push rod 14, push rod 14 periphery wall is provided with annular protrusion 16, stage clip 30 is provided with between annular protrusion 16 on the step surface of stepped hole 15 and push rod 14, stepped hole 15 opening part is combined with nut 20 to be locked in stepped hole 15 by the annular protrusion 16 on push rod 14, end away from the second gear 26 on push rod 14 one end and ratchet 27 pushes against, the other end stretches out boss 4 or is contracted in boss 4, described pedestal 1 is rotatably connected to for pipe fitting 2 is bent into the flap 21 consistent with through hole 6 shape, flap 21 comprises for the curved portions 22 of moulding pipe 2 bending region and the line part 23 for moulding pipe 2 linearity region, pedestal 1 is connected with the hydraulic machine for driving flap 21 to rotate, drift 24 on hydraulic machine contacts with the line part 23 on flap 21, and is connected with the 3rd extension spring 29 between line part 23 on flap 21 and pedestal 1, described pedestal 1 is provided with stopping means spacing when resetting for flap 21.
Described stopping means refers to and pedestal 1 is fixedly connected with multiple limited block 31, and sidewall limited block 31 and flap 21 deviating from pipe fitting 2 pushes against or throws off.
Described limited block 31 has two, and two limited blocks 31 push against with line part 23 on flap 21 or depart from simultaneously, and that is the line of two limited blocks 31 overlaps with line part 23 outer wall on flap 21.
Described slide bar 12 is slidably connected in pedestal 1 by dovetail groove.Described to be slidably connected the raised line referring to and slide bar 12 can be arranged dove-tail form by dovetail groove, and pedestal 1 can be arranged the dove-tail form chute slided for dove-tail form raised line, thus slide bar 12 both can slide along the length direction of chute, and, the raised line of dove-tail form is can not from the vertical disengaging of dove-tail form chute, and dove-tail form raised line can only slip away from the both ends of dove-tail form chute.
The first described extension spring 10 is socketed on slide bar 12, and first extension spring 10 one end is connected with slide bar 12 junction with straight pin 9, and the other end is connected with at the bottom of blind hole 11 hole.
Second described extension spring 28 one end is connected with the end near the second gear 26 on ratchet 27, and the other end is connected with pedestal 1.
Described straight pin 9 has two, and two straight pins 9 are in same level, and two straight pins 9 form a U-shaped structure with slide bar 12 end, as shown in Figure 1.Wherein, the concrete quantity of straight pin 9 depending on actual conditions, can carry out concrete plus-minus.
The foregoing is only preferred embodiment of the present invention, not for limiting the scope of the invention.All within the claims in the present invention, any amendment done, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (7)
1. the device for bending blanking, it is characterized in that: it comprises pedestal (1), pedestal (1) is provided with for the datum level (3) placing pipe fitting (2) free end and rotate for pipe fitting (2) free end, pedestal (1) is provided with the boss (4) of locating for pipe fitting (2) the other end higher than datum level (3), and boss (4) is provided with the opening (5) for accommodating pipe fitting (2) end, described pedestal (1) is vertically provided with the through hole (6) that the pipe fitting (2) after for bending vertically slides, through hole (6) shape is consistent with the shape after pipe fitting (2) bending, through hole (6) vertically through pedestal (1) upper surface with lower surface and through hole (6) be vertically communicated with opening (5), through hole (6) comprises the first through hole (17) be positioned at immediately below boss (4) and the second through hole (18) being positioned at boss (4) outside, first through hole (17) is communicated with by arc-shaped through-hole (19) with the second through hole (18), boss (4) is in same perpendicular for the upper sidewall (8) near boss (4) side of the perpendicular (7) crossing with datum level (3) and the second through hole (18), described pedestal (1) slidably connects and extracts to remove the straight pin (9) to the constraint of pipe fitting (2) one end with support tubes (2) one end or from through hole (6) for stretching into through hole (6), straight pin (9) is arranged on and is positioned at position immediately below boss (4), and straight pin (9) top edge and datum level (3) are in same level, described pedestal (1) is provided with accommodating straight pin (9) and the blind hole (11) of sliding for straight pin (9), the first extension spring (10) is provided with between straight pin (9) and blind hole (11) bottom, straight pin (9) is extended with slide bar (12) towards pedestal (1) outside, and slide bar (12) is slidably connected in pedestal (1) and slide bar (12) is provided with linear gear rack (13), a pair intermeshing first gear (25) and the second gear (26) is rotatably connected to, the first gear (25) and linear gear rack (13) engaged transmission on slide bar (12) in described pedestal (1), pedestal (1) is rotatably connected to ratchet (27), ratchet (27) one end and (26) clamping of the second gear or disengagement, and between the upper end near the second gear (26) of ratchet (27) and pedestal (1), be connected with the second extension spring (28) be connected to for ratchet (27) on the second gear (26), the upper region near perpendicular (7) of boss (4) slidably connect for bending after the push rod (14) that pushes against of pipe fitting (2), boss (4) is provided with for accommodating push rod (14) and the stepped hole (15) slided for push rod (14), push rod (14) periphery wall is provided with annular protrusion (16), stage clip (30) is provided with between annular protrusion (16) on the step surface of stepped hole (15) and push rod (14), stepped hole (15) opening part is combined with nut (20) to be locked in stepped hole (15) by the annular protrusion (16) on push rod (14), end away from the second gear (26) on push rod (14) one end and ratchet (27) pushes against, the other end stretches out boss (4) or is contracted in boss (4), described pedestal (1) is rotatably connected to for pipe fitting (2) is bent into the flap (21) consistent with through hole (6) shape, flap (21) comprises the curved portions (22) for moulding pipe (2) bending region and the line part (23) for moulding pipe (2) linearity region, pedestal (1) is connected with the hydraulic machine for driving flap (21) to rotate, drift (24) on hydraulic machine contacts with the line part (23) on flap (21), and be connected with the 3rd extension spring (29) between line part (23) on flap (21) and pedestal (1), described pedestal (1) is provided with stopping means spacing when resetting for flap (21).
2. the device for bending blanking according to claim 1, it is characterized in that: described stopping means refers to and pedestal (1) is fixedly connected with multiple limited block (31), sidewall limited block (31) and flap (21) deviating from pipe fitting (2) pushes against or throws off.
3. the device for bending blanking according to claim 2, it is characterized in that: described limited block (31) has two, and the while of two limited blocks (31), upper line part (23) pushes against or departs from flap (21).
4. the device for bending blanking according to claim 1, is characterized in that: described slide bar (12) is slidably connected in pedestal (1) by dovetail groove.
5. the device for bending blanking according to claim 1, it is characterized in that: described the first extension spring (10) is socketed on slide bar (12), and the first extension spring (10) one end is connected with slide bar (12) junction with straight pin (9), the other end is connected with at the bottom of blind hole (11) hole.
6. the device for bending blanking according to claim 1, it is characterized in that: described the second extension spring (28) one end is connected with the upper end near the second gear (26) of ratchet (27), and the other end is connected with pedestal (1).
7. the device for bending blanking according to claim 1, it is characterized in that: described straight pin (9) has two, and two straight pins (9) are in same level, two straight pins (9) form a U-shaped structure with slide bar (12) end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510793534.9A CN105251819B (en) | 2015-11-18 | 2015-11-18 | Bending and blanking device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510793534.9A CN105251819B (en) | 2015-11-18 | 2015-11-18 | Bending and blanking device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105251819A true CN105251819A (en) | 2016-01-20 |
| CN105251819B CN105251819B (en) | 2017-05-10 |
Family
ID=55091915
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510793534.9A Expired - Fee Related CN105251819B (en) | 2015-11-18 | 2015-11-18 | Bending and blanking device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105251819B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109967575A (en) * | 2019-04-29 | 2019-07-05 | 奥克坦姆系统科技（苏州）有限公司 | A kind of shape extrusion tooling |
| CN112692118A (en) * | 2020-12-24 | 2021-04-23 | 余万鹏 | A roll up shape device for circular iron sheet bucket |
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| JPH09314242A (en) * | 1996-05-31 | 1997-12-09 | Yoshihisa Ota | Manufacture of discharge tube and press device therefor |
| JP2008149344A (en) * | 2006-12-15 | 2008-07-03 | Toyota Motor Corp | Device and method for bending tubular member |
| CN201609727U (en) * | 2010-01-26 | 2010-10-20 | 安徽中鼎金亚汽车管件制造有限公司 | Pneumatic oil pipe bending tooling |
| JP2013107117A (en) * | 2011-11-22 | 2013-06-06 | Kobe Steel Ltd | Bending method of hollow extruded shape made of aluminum alloy, hollow extruded shape made of aluminum alloy using the method, method for manufacturing battery frame for automobile, battery frame for automobile, method for manufacturing frame structure of seat, and frame structure of seat |
| CN103658398A (en) * | 2013-12-06 | 2014-03-26 | 乔登卫浴(江门)有限公司 | Forming die used for thin walled pipe faucet water outlet nozzle |
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2015
- 2015-11-18 CN CN201510793534.9A patent/CN105251819B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09314242A (en) * | 1996-05-31 | 1997-12-09 | Yoshihisa Ota | Manufacture of discharge tube and press device therefor |
| JP2008149344A (en) * | 2006-12-15 | 2008-07-03 | Toyota Motor Corp | Device and method for bending tubular member |
| CN201609727U (en) * | 2010-01-26 | 2010-10-20 | 安徽中鼎金亚汽车管件制造有限公司 | Pneumatic oil pipe bending tooling |
| JP2013107117A (en) * | 2011-11-22 | 2013-06-06 | Kobe Steel Ltd | Bending method of hollow extruded shape made of aluminum alloy, hollow extruded shape made of aluminum alloy using the method, method for manufacturing battery frame for automobile, battery frame for automobile, method for manufacturing frame structure of seat, and frame structure of seat |
| CN103658398A (en) * | 2013-12-06 | 2014-03-26 | 乔登卫浴(江门)有限公司 | Forming die used for thin walled pipe faucet water outlet nozzle |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109967575A (en) * | 2019-04-29 | 2019-07-05 | 奥克坦姆系统科技（苏州）有限公司 | A kind of shape extrusion tooling |
| CN112692118A (en) * | 2020-12-24 | 2021-04-23 | 余万鹏 | A roll up shape device for circular iron sheet bucket |
| CN112692118B (en) * | 2020-12-24 | 2023-09-01 | 山东佳佳家居用品有限公司 | Rolling device for round iron barrel |
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| Publication number | Publication date |
|---|---|
| CN105251819B (en) | 2017-05-10 |
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Granted publication date: 20170510 Termination date: 20211118 |