CN205571129U - Shearing and punching machine is united to hydraulic pressure proof warp song mechanism of punching a hole - Google Patents
Shearing and punching machine is united to hydraulic pressure proof warp song mechanism of punching a hole Download PDFInfo
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- CN205571129U CN205571129U CN201620329649.2U CN201620329649U CN205571129U CN 205571129 U CN205571129 U CN 205571129U CN 201620329649 U CN201620329649 U CN 201620329649U CN 205571129 U CN205571129 U CN 205571129U
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- punching
- lower mould
- hole
- shearing machine
- mould body
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Abstract
The utility model discloses a shearing and punching machine is united to hydraulic pressure proof warp song mechanism of punching a hole belongs to the cut -out press field. (1)The utility model comprises a base (1), frame, base platform and die shoe, frame and base platform are fixed on the base, are provided with the die shoe in the frame, are provided with drift and hydraulic pressure material compression rod on the die shoe, be provided with the fixed block on the base platform, the draw -in groove has been seted up at the fixed block middle part, has placed the lower mould that punches a hole in the draw -in groove, the lower mould that punches a hole includes the lower mould body and the lower mould arc body, and the lower mould arc body is outside convex cambered surface including up end and arcwall face, arcwall face, and the arc core angle of the circular arc section that the arbitrary longitudinal section of arcwall face formed is alpha, and alpha's size is 3~4, the die cavity is the through -hole, and the die cavity runs through the center part of the lower mould arc body and lower mould body, and die cavity and drift are on same straight line. The utility model discloses can effectively solve and punch a hole with man -hour, an easy both ends warpage that punches a hole, the problem that the processing qualification rate is low, manufacturing cost is high.
Description
Technical field
This utility model relates to punching die technical field, more particularly, it relates to the warpage preventing punching of a kind of hydraulic combined punching & shearing machine
Holes mechanism.
Background technology
Hydraulic combined punching & shearing machine typically has five stations: station sheared by standard configuration punching station, angle steel shaped steel, bar is cut off
Station, sheet shearing station, corner cut station etc., can realize being processed multiple shaped steel and sheet material, reach the effect of a tractor serves several purposes
Really, be modern mechanical manufacturing industry such as: metallurgy, bridge, communication, electric power etc. industry ideal equipment, therefore in production practices
Apply the most extensive.
When the standard punching die using hydraulic combined punching & shearing machine in prior art is processed, punching part is placed in punching lower mold,
Needing owing to producing, drift moves downward and is punched out adding man-hour, and drift orifice moment that liquidates applies bigger stamping press, punching
By drift and the bi-directional force of punching lower mold, easily there is the phenomenon that marginal portion is upturned simultaneously in part so that punching part
Producing gross distortion, impact is normal to be used, thus reduces the production qualification rate of punching processing, improves the production cost of enterprise,
The a great problem being increasingly becoming in production.
About how, the punch mechanism of hydraulic combined punching & shearing machine is improved, it is to avoid machining deformation problem, existing in prior art
Patents is open, such as Chinese Patent Application No.: 2011202509376, the applying date: on July 16th, 2011, invention wound
Make entitled: precise hydraulic punching (shearing) machine, this application case disclose a kind of sheet material is punched out, the precision of the processing such as punching
Hydraulic combined punching & shearing machine, including base, frame, die shoe, workbench and retainer platform, frame is fixed on base, frame
Be provided with die shoe on retainer platform, die shoe is provided with drift, workbench is fixed on base, and can be relative to base
Mobile, it is provided with the hydraulic clamp of fixing processing sheet material in one end of workbench, workbench and retainer platform is provided with some
Individual equally distributed reset roller unit, is fixed with holding pad by hydraulic pressure material pressing device on die shoe；This application case uses " high
Accurate, low elasticity deformation " know-why, punching and shearing machine arranges hydraulic pressure material pressing device and reset roller unit, reduces because of wink
Between the elastic deformation brought of stamping press that produces, improve punching precision；But this application case complex structural designs, it is difficult to promote, and
This application case improves the elastic deformation that workpiece pressurized to be added produces, and the most still cannot avoid workpiece two-end part stress warpage to be added
Problem on deformation, it is still necessary to improve further.
Utility model content
1. utility model to solve the technical problem that
The purpose of this utility model is to overcome hydraulic combined punching & shearing machine in prior art to be punched out adding man-hour, is easily caused punching
The buckling deformation of part two ends, the deficiency that passing rate of processing is low, production cost is high, it is provided that the warpage preventing of a kind of hydraulic combined punching & shearing machine
Punch mechanism, can effectively solve problem above.
2. technical scheme
For reaching above-mentioned purpose, the technical scheme that this utility model provides is:
The warpage preventing punch mechanism of a kind of hydraulic combined punching & shearing machine of the present utility model, including base, frame, base platform and punching
Die holder, described frame and base platform are fixed on base, described frame is provided with die shoe, described die shoe is provided with
Drift and hydraulic pressure compressing rod, be fixed with holding pad bottom described hydraulic pressure compressing rod；
It is provided with fixed block on described base platform, offers draw-in groove in the middle part of fixed block, in described draw-in groove, be placed with punching lower mold；
Described punching lower mold includes lower mould body and is positioned at the lower mold arc body above lower mould body, and described lower mold arc body includes upper surface
And arcwall face, being smoothly transitted by arcwall face between upper surface with lower mould body and be connected, described arcwall face is outwardly cambered surface；
Die cavity is through hole, and this die cavity runs through lower mold arc body and the centre of lower mould body, and described die cavity and above-mentioned drift are at same straight line
On.
Further improving as this utility model, the centering angle of the arc section that any longitudinal cross-section of described arcwall face is formed is α,
The size of α is 3 °～4 °.
Further improving as this utility model, described upper surface is horizontal plane.
Further improving as this utility model, the lateral symmetry of described lower mould body offers keyway.
Further improving as this utility model, described fixed block is fixed on base platform by installing screw.
Further improving as this utility model, the lateral symmetry of described fixed block offers the screwed hole of horizontal distribution, institute
State screwed hole to be connected with the draw-in groove in the middle part of fixed block.
Further improving as this utility model, be provided with clamping screw in described screwed hole, the end of thread of clamping screw is stretched
Entering in the keyway of lower mould body both sides, lower mould body is locked in draw-in groove by clamping screw.
Further improving as this utility model, described lower mould body is cylindrical structure.
Further improving as this utility model, described holding pad both sides offer the through hole running through holding pad thickness direction,
The bottom of hydraulic pressure compressing rod is provided with threaded rod, and this threaded rod sets on above-mentioned through hole, and the threaded rod of holding pad both sides respectively
It is equipped with nut.
Further improving as this utility model, offer punching and dodge hole in the middle part of described holding pad, drift passes above-mentioned punching
Hole is dodged in hole.
3. beneficial effect
The technical scheme using this utility model to provide, compared with prior art, has the advantages that
(1) the warpage preventing punch mechanism of a kind of hydraulic combined punching & shearing machine of the present utility model, is fixed with binder bottom hydraulic pressure compressing rod
Plate, specially holding pad both sides offer the through hole running through holding pad thickness direction, are provided with screw thread, hydraulic pressure compressing rod in this through hole
Bottom be provided with the threaded rod that this screw thread matches, this threaded rod is through on above-mentioned through hole, and the threaded rod of holding pad both sides point
Not being provided with nut, a nut is positioned at above holding pad, and a nut is positioned at below holding pad, two nuts jointly act on by
Holding pad is locked at bottom hydraulic pressure compressing rod, uses this design to make holding pad easy installation and removal, it is simple to change.
(2) the warpage preventing punch mechanism of a kind of hydraulic combined punching & shearing machine of the present utility model, base platform is provided with fixed block,
Offer draw-in groove in the middle part of fixed block, in draw-in groove, be placed with punching lower mold；Punching lower mold includes lower mould body and lower mold arc body, lower mold
The lateral symmetry of lower mould body offers keyway, and fixed block lateral symmetry offers the screwed hole of horizontal distribution, and this screwed hole is with solid
Determining the draw-in groove in the middle part of block to be connected, be provided with clamping screw in screwed hole, the end of thread of clamping screw extend into lower mould body both sides
Keyway in, lower mould body is locked in draw-in groove by clamping screw, thus punching lower mold is locked in fixed block, it is ensured that punching
The safety of processing and accuracy, it is to avoid punching lower mold shakes and offsets and cause processing the problems such as defective, product rejection,
Ensure that safety and the machining accuracy of punching processing.
(3) the warpage preventing punch mechanism of a kind of hydraulic combined punching & shearing machine of the present utility model, punching lower mold includes lower mould body and position
Lower mold arc body above lower mould body, lower mold arc body includes upper surface and arcwall face, and upper surface is horizontal plane, upper surface with under
Being smoothly transitted connection by arcwall face between mould body, arcwall face is outwardly cambered surface, and any longitudinal cross-section of arcwall face can shape
Become two sections of symmetrical arc sections, the centering angle of every section of arc section be the size of α, α be 3 °～4 °, in this utility model under
The design of mould arc body can be effectively improved punching part easy buckling deformation problem in prior art, when this utility model uses, by punching
Part horizontal is on upper surface, and punching part is less with the contact area of punching lower mold, and two side positions of punching part are unsettled, has disperseed punching
The stressing conditions of orifice two side position, drift orifice moment that liquidates produces huge punching power F1 vertically downward, and punching part is with upper
End face edge still can produce certain recoil strength F2 to contact site, but this recoil strength F2 is near the middle part of punching part, with punching
The most yielding marginal position of part is apart from each other, and while punching part bears punching power F1, recoil strength F2 is difficult to cause punching
The buckling deformation of part, thus ensure that the final crudy of punching part.
Accompanying drawing explanation
Fig. 1 is the structural representation of the warpage preventing punch mechanism of a kind of hydraulic combined punching & shearing machine of the present utility model；
Fig. 2 is the assembling structural representation of fixed block and punching lower mold in this utility model；
Fig. 3 is the structural representation of punching lower mold in this utility model；
Fig. 4 is punching part machining state stress schematic diagram in prior art；
Punching part machining state force diagram when Fig. 5 is this utility model use.
Label declaration in schematic diagram: 1, lower mould body；101, keyway；2, die cavity；3, lower mold arc body；301, upper surface；
302, arcwall face；4, punching part；5, frame；6, base platform；7, fixed block；701, screwed hole；702, locking screw
Bolt；703, screw is installed；8, punching lower mold；9, holding pad；10, hydraulic pressure compressing rod；11, die shoe；12, drift.
Detailed description of the invention
For further appreciating that content of the present utility model, with embodiment, this utility model is described in detail below in conjunction with the accompanying drawings.
Embodiment 1
As shown in Fig. 1～Fig. 5, the warpage preventing punch mechanism of a kind of hydraulic combined punching & shearing machine of the present embodiment, including base, frame
5, base platform 6 and die shoe 11, frame 5 and base platform 6 are fixed on base, and frame 5 is provided with die shoe 11,
It is provided with drift 12 and hydraulic pressure compressing rod 10 on die shoe 11, bottom hydraulic pressure compressing rod 10, is fixed with holding pad 9, be specially pressure
Flitch 9 both sides offer the through hole running through holding pad 9 thickness direction, are provided with screw thread, the bottom of hydraulic pressure compressing rod 10 in this through hole
Being provided with the threaded rod that this screw thread matches, this threaded rod sets on above-mentioned through hole, and the threaded rod of holding pad 9 both sides respectively
Being equipped with nut, a nut is positioned at above holding pad 9, and a nut is positioned at below holding pad 9, two nuts jointly act on by
Holding pad 9 is locked at bottom hydraulic pressure compressing rod 10, uses this design to make holding pad 9 easy installation and removal, it is simple to change；
Being further opened with punching in the middle part of holding pad 9 and dodge hole, drift 12 is dodged hole through this punching and is done punching campaign.
Being provided with fixed block 7 on base platform 6, fixed block 7 is fixed on base platform 6 by installing screw 703, fixing
Offer draw-in groove in the middle part of block 7, in draw-in groove, be placed with punching lower mold 8；Punching lower mold 8 includes lower mould body 1 and is positioned at lower calligraphy or painting model
Lower mold arc body 3 above body 1, lower mould body 1 is cylindrical structure, and the lateral symmetry of lower mould body 1 offers keyway 101；
Lower mold arc body 3 includes that upper surface 301 and arcwall face 302, upper surface 301 are horizontal plane, upper surface 301 and lower mould body 1
Between smoothly transitted connections by arcwall face 302, arcwall face 302 be outwardly cambered surface, arcwall face 302 arbitrarily longitudinal direction section
The size that centering angle is α, α of the arc section that face is formed is 3 °～4 °, and the size of α is 3 ° the most in the present embodiment；Mould
Chamber 2 is through hole, and this die cavity 2 runs through lower mold arc body 3 and the centre of lower mould body 1, and die cavity 2 and drift 12 are with always
On line.
When the warpage preventing punch mechanism of a kind of hydraulic combined punching & shearing machine of the present embodiment uses, punching part 4 horizontal is in punching lower mold 8
Upper surface 301 on, hydraulic pressure compressing rod 10 moves downward, and the holding pad 9 bottom it is pressed in punching part 4 on punching part 4 solid
Fixed, then drift 12 is dodged hole through the punching in holding pad 9 and is done punching campaign, for ensureing that the safety of punching processing is with accurate
Property, it is to avoid punching lower mold 8 shakes and offsets and cause processing the problems such as defective, product rejection, fixed block in the present embodiment
7 lateral symmetry offer the screwed hole 701 of horizontal distribution, and this screwed hole 701 is connected with the draw-in groove in the middle part of fixed block 7, screw thread
Being provided with clamping screw 702 in hole 701, the end of thread of clamping screw 702 extend in the keyway 101 of lower mould body 1 both sides,
Lower mould body 1 is locked in draw-in groove by clamping screw 702, thus punching lower mold 8 is locked in fixed block 7, it is ensured that punching
The safety of hole machined and machining accuracy.
It should be noted that as shown in Figure 4, punching lower mold 8 of the prior art is simply made up of cylindrical lower mould body 1,
During production and processing, by punching part 4 horizontal in the upper surface of lower mould body 1, drift 12 orifice 4 moment that liquidates produces huge hanging down
The most downward punching power F1, owing to two side positions of punching part 4 directly contact, in punching power with the marginal position of lower mould body 1
Under the impact of F1, two side positions of punching part 4 bear the recoil strength F2 upwards that lower mould body 1 applies simultaneously, cause punching part
The two side positions upturned deformation of easy stress of 4, affects final crudy, reduces conforming product rate.In order to improve punching
The final crudy of orifice 4, it is to avoid buckling deformation problem, the warpage preventing punching of a kind of hydraulic combined punching & shearing machine of the present embodiment
Mechanism, the lower mould body 1 at cylindrical structure is arranged above lower mold arc body 3, and this lower mold arc body 3 includes upper surface 301
With arcwall face 302, upper surface 301 is horizontal plane, is slipped over by arcwall face 302 light between upper surface 301 and lower mould body 1
Crossing connection, arcwall face 302 is outwardly cambered surface, and any longitudinal cross-section of arcwall face 302 can form symmetrical two section circular arc
Section, the centering angle of every section of arc section is α, as it is shown in figure 5, use the present embodiment to be punched out adding man-hour, by flat for punching part 4
Putting on upper surface 301, punching part 4 is less with the contact area of punching lower mold, and two side positions of punching part 4 are unsettled, dispersion
The stressing conditions of 4 liang of side positions of punching part, drift 12 orifice 4 still moment that liquidates produces huge punching power vertically downward
F1, punching part 4 and side edge contact portion position, upper surface 301 still can produce certain recoil strength F2, but this recoil strength F2 is close
The middle part of punching part 4, marginal position the most yielding with punching part 4 is apart from each other, bears the same of punching power F1 at punching part 4
Time, recoil strength F2 is difficult to cause the buckling deformation of punching part 4, thus ensure that the final crudy of punching part 4.Arcwall face
The size that 302 any longitudinal cross-sections form arc section centering angle α is most important for the crudy controlling punching part 4, and α is relatively
Not only it is difficult to disperse the stress of 4 liang of side positions of punching part time big, brings bigger difficulty to the mould molding of punching lower mold 8 simultaneously,
Causing punching lower mold 8 to process inconvenience, processing cost is higher；Also the 4 liang of side position stress feelings of orifice that liquidate it are difficult to ensure that when α is too small
The dispersion of condition, weakens the mould strength of lower mold arc body 3 simultaneously, is unfavorable for the life-time service of punching lower mold 8.Technical staff's warp
Cross long-term experimental verification and theory analysis, find when the size of α is 3 °～4 °, most beneficial for the final processing of punching part 4
Quality, can be effectively improved the buckling deformation problem of punching part 4, and make punching lower mold 8 processing and forming convenient, and service life prolongs
Long, significantly reduce production cost.
Embodiment 2
With embodiment 1, except that arcwall face 302 is outwardly cambered surface in the present embodiment, arcwall face 302 is the most vertical
Symmetrical two section arc section can be formed to cross section, the centering angle of every section of arc section be the size of α, α be 4 °.
Embodiment 3
With embodiment 1, except that arcwall face 302 is outwardly cambered surface in the present embodiment, arcwall face 302 is the most vertical
Symmetrical two section arc section can be formed to cross section, the centering angle of every section of arc section be the size of α, α be 3.5 °.
Schematically being described this utility model and embodiment thereof above, this description does not has restricted, shown in accompanying drawing
Be also one of embodiment of the present utility model, actual structure is not limited thereto.So, if this area is common
Technical staff is enlightened by it, in the case of creating objective without departing from this utility model, designs and this technology without creative
Frame mode that scheme is similar and embodiment, all should belong to protection domain of the present utility model.
Claims (10)
1. the warpage preventing punch mechanism of a hydraulic combined punching & shearing machine, including base, frame (5), base platform (6) and die shoe (11), it is characterized in that: described frame (5) and base platform (6) are fixed on base, die shoe (11) it is provided with in described frame (5), being provided with drift (12) and hydraulic pressure compressing rod (10) on described die shoe (11), described hydraulic pressure compressing rod (10) bottom is fixed with holding pad (9)；
Being provided with fixed block (7) on described base platform (6), fixed block (7) middle part offers draw-in groove, is placed with punching lower mold (8) in described draw-in groove；
Described punching lower mold (8) includes lower mould body (1) and is positioned at lower mold arc body (3) of lower mould body (1) top; described lower mold arc body (3) includes upper surface (301) and arcwall face (302); being smoothly transitted by arcwall face (302) between upper surface (301) with lower mould body (1) and be connected, described arcwall face (302) is outwardly cambered surface；Die cavity (2) is through hole, and this die cavity (2) runs through lower mold arc body (3) and the centre of lower mould body (1), and described die cavity (2) is with above-mentioned drift (12) on the same line.
The warpage preventing punch mechanism of a kind of hydraulic combined punching & shearing machine the most according to claim 1, it is characterised in that: the size that centering angle is α, α of described arcwall face (302) the arbitrarily arc section that longitudinal cross-section is formed is 3 °～4 °.
The warpage preventing punch mechanism of a kind of hydraulic combined punching & shearing machine the most according to claim 1 and 2, it is characterised in that: described upper surface (301) are horizontal plane.
The warpage preventing punch mechanism of a kind of hydraulic combined punching & shearing machine the most according to claim 1, it is characterised in that: the lateral symmetry of described lower mould body (1) offers keyway (101).
The warpage preventing punch mechanism of a kind of hydraulic combined punching & shearing machine the most according to claim 1, it is characterised in that: described fixed block (7) is fixed on base platform (6) by installing screw (703).
The warpage preventing punch mechanism of a kind of hydraulic combined punching & shearing machine the most according to claim 4, it is characterized in that: the lateral symmetry of described fixed block (7) offers the screwed hole (701) of horizontal distribution, described screwed hole (701) is connected with the draw-in groove at fixed block (7) middle part.
The warpage preventing punch mechanism of a kind of hydraulic combined punching & shearing machine the most according to claim 6, it is characterized in that: in described screwed hole (701), be provided with clamping screw (702), the end of thread of clamping screw (702) extend in the keyway (101) of lower mould body (1) both sides, and lower mould body (1) is locked in draw-in groove by clamping screw (702).
The warpage preventing punch mechanism of a kind of hydraulic combined punching & shearing machine the most according to claim 1, it is characterised in that: described lower mould body (1) is cylindrical structure.
The warpage preventing punch mechanism of a kind of hydraulic combined punching & shearing machine the most according to claim 1, it is characterized in that: described holding pad (9) both sides offer the through hole running through holding pad (9) thickness direction, the bottom of hydraulic pressure compressing rod (10) is provided with threaded rod, this threaded rod is respectively arranged with nut on above-mentioned through hole, and the threaded rod of holding pad (9) both sides.
The warpage preventing punch mechanism of a kind of hydraulic combined punching & shearing machine the most according to claim 1, it is characterised in that: described holding pad (9) middle part offers punching and dodges hole, and drift (12) dodges hole through above-mentioned punching.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620329649.2U CN205571129U (en) | 2016-04-18 | 2016-04-18 | Shearing and punching machine is united to hydraulic pressure proof warp song mechanism of punching a hole |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620329649.2U CN205571129U (en) | 2016-04-18 | 2016-04-18 | Shearing and punching machine is united to hydraulic pressure proof warp song mechanism of punching a hole |
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| Publication Number | Publication Date |
|---|---|
| CN205571129U true CN205571129U (en) | 2016-09-14 |
Family
ID=56863186
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620329649.2U Expired - Fee Related CN205571129U (en) | 2016-04-18 | 2016-04-18 | Shearing and punching machine is united to hydraulic pressure proof warp song mechanism of punching a hole |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106217058A (en) * | 2016-09-20 | 2016-12-14 | 安徽中意机床制造有限公司 | A kind of multifunction hydraulic punching (shearing) machine and punching-shearing method thereof |
| CN106271656A (en) * | 2016-09-20 | 2017-01-04 | 安徽中意机床制造有限公司 | Multi-purpose punching and shearing machine that a kind of shearing quality is high, easy to operate and punching-shearing method thereof |
| CN106424327A (en) * | 2016-09-20 | 2017-02-22 | 安徽中意机床制造有限公司 | Assembly-type heavy hydraulic punching and shearing machine with high punching and shearing precision and punching and shearing method thereof |
| CN108284150A (en) * | 2017-12-30 | 2018-07-17 | 天津市维丹科技有限责任公司 | A kind of metallic plate drilling aid |
| CN111531025A (en) * | 2020-06-03 | 2020-08-14 | 国网安徽省电力有限公司淮北供电公司 | Hydraulic punching structure and hydraulic punching tool |
-
2016
- 2016-04-18 CN CN201620329649.2U patent/CN205571129U/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106217058A (en) * | 2016-09-20 | 2016-12-14 | 安徽中意机床制造有限公司 | A kind of multifunction hydraulic punching (shearing) machine and punching-shearing method thereof |
| CN106271656A (en) * | 2016-09-20 | 2017-01-04 | 安徽中意机床制造有限公司 | Multi-purpose punching and shearing machine that a kind of shearing quality is high, easy to operate and punching-shearing method thereof |
| CN106424327A (en) * | 2016-09-20 | 2017-02-22 | 安徽中意机床制造有限公司 | Assembly-type heavy hydraulic punching and shearing machine with high punching and shearing precision and punching and shearing method thereof |
| CN108057770A (en) * | 2016-09-20 | 2018-05-22 | 安徽中意机床制造有限公司 | A kind of punching-shearing method of the assembly type heavy type hydraulic punching and shearing machine of high punching precision |
| CN106271656B (en) * | 2016-09-20 | 2019-05-21 | 安徽中意机床制造有限公司 | A kind of shearing quality is high, the punching-shearing method of easy to operate multi-purpose punching and shearing machine |
| CN106424327B (en) * | 2016-09-20 | 2019-05-21 | 安徽中意机床制造有限公司 | A kind of assembly type heavy type hydraulic punching and shearing machine of high punching precision |
| CN108057770B (en) * | 2016-09-20 | 2019-06-04 | 安徽中意机床制造有限公司 | A kind of punching-shearing method of the assembly type heavy type hydraulic punching and shearing machine of high punching precision |
| CN108284150A (en) * | 2017-12-30 | 2018-07-17 | 天津市维丹科技有限责任公司 | A kind of metallic plate drilling aid |
| CN111531025A (en) * | 2020-06-03 | 2020-08-14 | 国网安徽省电力有限公司淮北供电公司 | Hydraulic punching structure and hydraulic punching tool |
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| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160914 Termination date: 20190418 |
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| CF01 | Termination of patent right due to non-payment of annual fee |