CN109676398A - A kind of rack gear production system - Google Patents
A kind of rack gear production system Download PDFInfo
- Publication number
- CN109676398A CN109676398A CN201910172062.3A CN201910172062A CN109676398A CN 109676398 A CN109676398 A CN 109676398A CN 201910172062 A CN201910172062 A CN 201910172062A CN 109676398 A CN109676398 A CN 109676398A
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- China
- Prior art keywords
- rack gear
- milling
- rack
- clamping
- production system
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- 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
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P23/00—Machines or arrangements of machines for performing specified combinations of different metal-working operations not covered by a single other subclass
- B23P23/06—Metal-working plant comprising a number of associated machines or apparatus
Abstract
The invention discloses a kind of rack gear production systems, comprising: side milling mechanism, the processing for side at left and right sides of rack gear；Tooth punching mechanism is connected to side milling mechanism rear, for ingressing for rack gear upper surface denticle；Mill teeth mechanism is connected to tooth punching mechanism rear, the fine cut for rack gear upper surface denticle；End mill mechanism is connected to mill teeth mechanism rear, the processing for rack gear rear and front end face；Borehole drill construction is connected to end mill mechanism rear, the drilling for rack gear two sides mounting hole and front and back location hole.The rack gear production system is designed by its structure, can effectively be realized the assembly line processing of rack gear, greatly be reduced the production cost of rack gear, increase the speed of production of rack gear.
Description
Technical field
The present invention relates to a kind of machining instruments, more specifically, in particular to a kind of rack gear production system.
Background technique
Rack gear is the special gear that a kind of tooth is distributed on bar shape, and rack gear is generally divided into spur rack and diagonal-cut rack,
It is used respectively with straight spur gear and helical gears pairing, the flank profil of rack gear non-involute for straight line, to the flank of tooth
Yan Zewei plane is equivalent to reference radius as infinitely great roller gear.Since rack tooth profile is straight line, so each point in flank profil
Pressure angle having the same and the inclination angle for being equal to flank profil, this angle is 20 ° of the profile angle of rack gear and general unified standard value；Together
When, tooth pitch and modulus having the same on any bar straight line parallel with addendum line in rack gear.Since rack gear has These characteristics,
Therefore, rack gear is widely used in the mechanical equipment that elevator etc. moves in a straight line.
In the prior art, due to lacking special sign to the production system of rack gear, in rack gear production process, generally require cover more
Different lathe, in this way, production cost increases；Meanwhile the carrying in rack gear production has also seriously affected the speed of production of rack gear.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of rack gear production system, which passes through its structure
Design can effectively realize the assembly line processing of rack gear, greatly reduce the production cost of rack gear, increase the speed of production of rack gear.
A kind of rack gear production system, comprising:
Side milling mechanism, the processing for side at left and right sides of rack gear；
Tooth punching mechanism is connected to side milling mechanism rear, for ingressing for rack gear upper surface denticle；
Mill teeth mechanism is connected to tooth punching mechanism rear, the fine cut for rack gear upper surface denticle；
End mill mechanism is connected to mill teeth mechanism rear, the processing for rack gear rear and front end face；
Borehole drill construction is connected to end mill mechanism rear, the drilling for rack gear two sides mounting hole and front and back location hole.
Preferably, the side milling mechanism includes workbench, conveying device, traverse displacement unit, clamping device, milling attachment；Institute
Conveying device is stated on the workbench, and at least one rack gear is delivered to the traverse displacement unit, the traverse displacement unit is set
There is the square groove for placing rack gear, and can be moved along rack gear length direction；The clamping device is for clamping rack gear, the milling
There are two device is set, the two sides on the traverse displacement unit moving direction are respectively arranged on, the rack bar side facing cut clamped is cut.
Preferably, the tooth punching mechanism includes base, the cylinder around own axis being set on the base, sets
Side in the cylinder and the cutter hub that moves in the horizontal plane, wherein the outer wall of the cylinder is equipped with for installing rack gear
The mounting groove of blank, multiple mounting grooves are distributed along the cylinder circumferencial direction.
Preferably, the mill teeth mechanism includes support base, and the support base is equipped with the machining position for placing rack gear to be processed,
Fixture block, milling cutter and manipulator are provided with above the support base, the fixture block is for clamping the rack gear；The milling cutter is for essence
Mill the rack gear；The manipulator is put into the machining position and by the machined rack gear from described for grabbing the rack gear
Machining position crawl is removed.
Preferably, the end mill mechanism includes that rough milling device and rack gear being transported to institute for milling is clamped to rack gear
State the feeding device for rough milling device；Wherein, the device of rough milling includes: the positioning plate equipped with positioning tooth, the positioning tooth flank of tooth
Upward, and with rack gear cooperation fix the rack position；The cramping body that the oriented rack gear is clamped, it is right
The milling cutter of the rack gear processing clamped.
Preferably, the borehole drill construction includes:
Conveyer belt, the transmission for workpiece；
Clamping body is arranged in the transmission direction of the conveyer belt, and the clamping body includes the positioning for workpiece positioning
Fixture block and compression fixture block for workpiece clamping, the compression fixture block are that zigzag compresses fixture block；
Rig floor is arranged below the clamping body, and the rig floor is used for the support of the clamping body；
Drill bit is arranged on the rig floor, drilling of the drill bit for duct on workpiece.
The beneficial effects of the present invention are: can effectively realize tooth when rack gear production system provided by the invention is specifically used
The assembly line of item is processed, and is greatly reduced the production cost of rack gear, is increased the speed of production of rack gear, while can also reduce staff
Labor intensity.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
The embodiment of invention for those of ordinary skill in the art without creative efforts, can also basis
The attached drawing of offer obtains other attached drawings.
Fig. 1 is a kind of structural schematic diagram of rack gear production system provided by the embodiment of the present invention 1；
Fig. 2 is the structural schematic diagram of side milling mechanism provided by the embodiment of the present invention 2；
Fig. 3 is the structural schematic diagram of tooth punching mechanism provided by the embodiment of the present invention 3；
Fig. 4 is the structural schematic diagram of mill teeth mechanism provided by the embodiment of the present invention 4；
Fig. 5 is the structural schematic diagram of end mill mechanism provided by the embodiment of the present invention 5；
Fig. 6 is the structural schematic diagram of borehole drill construction provided by the embodiment of the present invention 6.
Specific embodiment
In order to make those skilled in the art better understand the technical solutions in the application, below in conjunction with the application reality
The attached drawing in example is applied, the technical scheme in the embodiment of the application is clearly and completely described, it is clear that described implementation
Example is merely a part but not all of the embodiments of the present application.Based on the embodiment in the application, this field is common
The application protection all should belong in technical staff's every other embodiment obtained without making creative work
Range.
In the description of the present invention, it is to be understood that, term " left side ", " right side ", " front ", " rear ", " top ",
The orientation or positional relationship of instructions such as " lower sections " is to be based on the orientation or positional relationship shown in the drawings, and is merely for convenience of description originally
Invention and simplified description, rather than the device or element of indication or suggestion meaning must have a particular orientation, with specific side
Position construction and operation, therefore be not considered as limiting the invention.
Embodiment 1:
As shown in Figure 1, Fig. 1 provides a kind of specific embodiment of rack gear production system, which can have
Effect realizes the automated production of rack gear.The rack gear production system includes:
Side milling mechanism 1, the processing for side at left and right sides of rack gear；
Tooth punching mechanism 2 is connected to side milling mechanism rear, for ingressing for rack gear upper surface denticle；
Mill teeth mechanism 3 is connected to tooth punching mechanism rear, the fine cut for rack gear upper surface denticle；
End mill mechanism 4 is connected to mill teeth mechanism rear, the processing for rack gear rear and front end face；
Borehole drill construction 5 is connected to end mill mechanism rear, the brill for rack gear two sides mounting hole and front and back location hole
It cuts.
Generally speaking, rack gear production system provided by the invention is able to achieve the automation of rack gear production, improves rack gear production
Efficiency, reduce intensity of workers.
Embodiment 2:
Referring to fig. 2, Fig. 2 provides a kind of specific embodiment of side milling mechanism 1, which includes workbench 101,
Conveying device 102 on workbench 101, multiple rack gears 6 are deposited in station to be added, and conveying device 102 will be along same perpendicular
Histogram is delivered to traverse displacement unit 103 (processing two sides in multiple 6 horizontal directions of rack gear) to the rack gear 6 of stacking, and rack gear 6 is put
It sets in the square groove being set on traverse displacement unit 103, traverse displacement unit 103 is moved along 6 length direction of rack gear, simultaneously clamps on device 104
Rack gear 6 is clamped, so that rack gear 6 will not be dropped out out of square groove, the two sides on 103 moving direction of traverse displacement unit are respectively arranged with milling
Turning device 105, when traverse displacement unit 103 is moved to the corresponding position of two milling attachments 105, milling attachment 105 starts other side
6 side of rack gear in slot carries out milling.6 former material facing cut equipment of rack gear provided by the present application, the side of the multiple rack gears 6 of simultaneous processing
Face, and the opposite side on a rack gear 6 carries out milling simultaneously simultaneously, it is compared with prior art, high in machining efficiency.
Embodiment 3:
A kind of specific embodiment of tooth punching mechanism 2 is provided referring to Fig. 3, Fig. 3, which includes base 201, around
The cylinder 202 being set to own axis on base 201, set on the side of cylinder 202, and the knife to move in the horizontal plane
Body 203, the outer wall of cylinder 202 are equipped with the mounting groove 204 for installing rack gear blank, and multiple mounting grooves 204 are along the circle of cylinder 202
Circumferential direction distribution, the cutter hub 203 is equipped with cutter, for the processing to the rack gear blank.When rack gear blank needs are opened slightly
When (roughing of rack gear blank), rack gear blank is fixed on cylindrical cylinder 202, it can be disposable on 202 side surface of cylinder
The multiple rack gear blanks of clamping are equipped with cutter hub 203 on base 201, in cutter hub 203 close to cylinder 202, that is, are set on cutter hub 203
Cutter gradually contact clamping on the outside of the rack gear blank in mounting groove 204, meanwhile, cylinder 202 with carry-over bar blank around its from
Body axis rotation, cutter carry out machining to the rack gear blank of rotation, complete opening slightly for rack gear blank, obtain preliminary molding
Rack gear shape, gear rack machining apparatus provided by the present application can multiple rack gear blanks of clamping simultaneously, with one, tooth of the prior art plus
Work comes out, and fills one, and processing one is compared, high in machining efficiency, while reducing labor intensity of workers.
Preferably, the cutter on cutter hub 203 is set as two, the spacing distance between two cutters is a tooth pitch, when
Two tooth socket completion of processing of simultaneous processing, the distance of mobile two tooth pitches of cutter hub 203.Wherein cutter includes but is not limited to, at
Type knife, lathe tool or other process tools, are not particularly limited herein.Wherein, installation can be set in 204 bottom of mounting groove
Hole, mounting hole are threaded hole；Fabrication hole is stayed on rack gear, fabrication hole is through-hole.Again by screw bolt passes fabrication hole, installation
Nut is screwed in hole, by rack gear blank clamping in mounting groove 204.
Wherein, locating piece is equipped in mounting groove 204, locating piece is detachably connected with cylinder 202, and locating piece is used for and installation
The fixed rack gear blank of the cooperation of slot 204.Locating piece is contacted with 204 side wall of mounting groove, and rack gear blank is installed on 204 side of mounting groove
Between wall and locating piece side wall.Locating piece is set in mounting groove 204, and locating piece is detachably connected with cylinder 202, in this way, fixed
Position block side is adjacent to rack gear blank, and the other side is adjacent to mounting groove 204.Locating piece is repeatable as the fixture of rack gear blank
It uses, without processing mounting-positioning holes on rack gear blank, shortens the process-cycle of rack gear blank.
Embodiment 4:
Referring to fig. 4, Fig. 4 provides a kind of specific embodiment of mill teeth mechanism 3, which includes support base 301,
Machining position on support base 301, fixture block 302 is provided at machining position, and fixture block 302 is placed in machining position for clamping
Multiple rack gears to be processed 6 are provided with the milling cutter 303 for processing the rack gear 6 on support base 301, are provided on support base 301
It grabs the rack gear 6 and is put into the machining position, or, the rack gear 6 to be grabbed to the manipulator 304 removed out of machining position.
Specifically, when rack gear 6 needs Milling Process, manipulator 304 grabs multiple rack gears to be processed 6, and rack gear 6 is put into
In machining position, multiple rack gears 6 are clamped by fixture block 302, and then, milling cutter 303 carries out milling to multiple rack gears 6 to be processed and adds
Work, after the completion of Milling Process, manipulator 304 grabs rack gear 6 machined in machining position, removes out of machining position, rack gear 6 it is whole
A mill teeth work is completed.The Gear Milling process of the prior art is to place rack gear 6 on the table, operator passes through combination
Clamp, then Milling Process unclamps built-up jig, rack gear 6 is carried to ground from workbench and is moved again after processing is completed
It walks.The application compared with prior art, can the multiple rack gears 6 of simultaneous processing, and 6 loading and unloading of automatic rack, whole process reduce
The labor intensity of operator, and it is high in machining efficiency.
Embodiment 5:
A kind of specific embodiment of mill teeth mechanism is provided referring to Fig. 5, Fig. 5, wherein the mill teeth mechanism includes to rack gear 6
Carry out locating clip tight milling rough mills device 401, and rack gear 6 is transported to the feeding device 402 for rough milling device 401.
Wherein, rough milling device 401 includes, the positioning plate 4011 equipped with positioning tooth, the positioning tooth flank of tooth upward, and with rack gear 6
Cooperation fixes 6 position of rack gear；The cramping body 4012 that oriented rack gear 6 is clamped adds the rack gear 6 clamped
The milling cutter 4013 of work.When rack gear 6 tooth form finishing after the completion of, need to 6 end face of rack gear (two sides of length direction) into
When row milling, feeding device 402 grabs multiple rack gears 6, then multiple rack gears 6 are transported to and rough mill device 401, multiple 6 teeth of rack gear
Down, multiple rack gears 6 are matched with the positioning tooth 211 of the flank of tooth upward, so that 6 position of rack gear is fixed.Then cramping body 4012
Oriented multiple rack gears 6 are clamped, last milling cutter 4013 starts to add the multiple progress of rack gears 6 end faces clamped
Work.Equipment is rough milled in 6 end face of rack gear provided by the present application, can carry out out slightly to the end face of multiple rack gears 6 simultaneously, and structure is simple,
Compared with equipment is rough milled in the end face of the prior art, it can be automatically positioned processing, clamping is simple, improves processing efficiency, is suitble to large quantities of
The end face rough milling of amount.
Specifically, which is generally used for rough milling for rack gear, certainly, can also be another if rack gear required precision is very high
Outer offer equipment is used for rack gear finish-milling.
Embodiment 6:
A kind of specific embodiment of borehole drill construction is provided referring to Fig. 6, Fig. 6, which is used for the drilling of workpiece, packet
It includes:
Conveyer belt 501, the transmission for workpiece；
Clamping body 502 is arranged in the transmission direction of the conveyer belt 501, and the clamping body 502 includes fixed for workpiece
The positioning fixture block and compression fixture block for workpiece clamping of position, the compression fixture block are that zigzag compresses fixture block；
Rig floor 503 is arranged below the clamping body 502, and the rig floor 503 is used for the support of the clamping body 502；
Drill bit 504 is arranged on the rig floor 503, drilling of the drill bit 504 for duct on workpiece.
When borehole drill construction provided in this embodiment is specifically used, rack gear hole to be drilled is first transmitted to clamping body by conveyer belt 501
At 502, clamping body 502 positions rack gear by positioning fixture block, and it is stuck in rack gear to compress fixture block for zigzag after the completion of positioning
Denticle on, then drill bit 504 to rack gear end face carry out duct drilling, finally, conveyer belt 501 will complete the tooth of drilling operation again
Item is transmitted to outside, so as to which the clamping of rack gear is effectively ensured in the borehole, it is ensured that the processing quality of rack gear.
A kind of rack gear production system provided by the present invention is described in detail above.It is used herein specifically a
Principle and implementation of the present invention are described for example, and it is of the invention that the above embodiments are only used to help understand
Method and its core concept.It should be pointed out that for those skilled in the art, not departing from the principle of the invention
Under the premise of, it can be with several improvements and modifications are made to the present invention, these improvement and modification also fall into the claims in the present invention
Protection scope in.
Claims (6)
1. a kind of rack gear production system characterized by comprising
Side milling mechanism, the processing for side at left and right sides of rack gear；
Tooth punching mechanism is connected to side milling mechanism rear, for ingressing for rack gear upper surface denticle；
Mill teeth mechanism is connected to tooth punching mechanism rear, the fine cut for rack gear upper surface denticle；
End mill mechanism is connected to mill teeth mechanism rear, the processing for rack gear rear and front end face；
Borehole drill construction is connected to end mill mechanism rear, the drilling for rack gear two sides mounting hole and front and back location hole.
2. rack gear production system according to claim 1, which is characterized in that the side milling mechanism includes workbench, conveying
Device, traverse displacement unit, clamping device, milling attachment；The conveying device is set on the workbench, and by least one rack gear
It is delivered to the traverse displacement unit, the traverse displacement unit is equipped with the square groove for placing rack gear, and can move along rack gear length direction；
The clamping device is for clamping rack gear, there are two the milling attachment is set, is respectively arranged on the traverse displacement unit moving direction
Two sides, the rack bar side facing cut clamped is cut.
3. rack gear production system according to claim 1, which is characterized in that the tooth punching mechanism includes base, around itself
Cylinder that axis is rotatably arranged on the base, the side set on the cylinder and the cutter hub that moves in the horizontal plane,
In, the outer wall of the cylinder is equipped with the mounting groove for installing rack gear blank, and multiple mounting grooves are along the cylinder circumference
Directional spreding.
4. rack gear production system according to claim 1, which is characterized in that the mill teeth mechanism includes support base, described
Support base is equipped with the machining position for placing rack gear to be processed, is provided with fixture block, milling cutter and manipulator above the support base, described
Fixture block is for clamping the rack gear；The milling cutter is for rack gear described in finish-milling；The manipulator is put into for grabbing the rack gear
The machining position simultaneously removes the machined rack gear from machining position crawl.
5. rack gear production system according to claim 1, which is characterized in that the end mill mechanism includes pressing from both sides to rack gear
Tight milling rough mills device and rack gear is transported to the feeding device for rough milling device；Wherein, the device of rough milling includes:
Positioning plate equipped with positioning tooth, the positioning tooth flank of tooth upward, and fix the rack position with rack gear cooperation；It will
The cramping body that the rack gear of positioning is clamped, to the milling cutter of the rack gear processing clamped.
6. rack gear production system according to claim 1, which is characterized in that the borehole drill construction includes:
Conveyer belt, the transmission for workpiece；
Clamping body is arranged in the transmission direction of the conveyer belt, and the clamping body includes the positioning fixture block for workpiece positioning
With compression fixture block for workpiece clamping, the compression fixture block is that zigzag compresses fixture block；
Rig floor is arranged below the clamping body, and the rig floor is used for the support of the clamping body；
Drill bit is arranged on the rig floor, drilling of the drill bit for duct on workpiece.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910172062.3A CN109676398A (en) | 2019-03-07 | 2019-03-07 | A kind of rack gear production system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910172062.3A CN109676398A (en) | 2019-03-07 | 2019-03-07 | A kind of rack gear production system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109676398A true CN109676398A (en) | 2019-04-26 |
Family
ID=66197738
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910172062.3A Pending CN109676398A (en) | 2019-03-07 | 2019-03-07 | A kind of rack gear production system |
Country Status (1)
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| CN (1) | CN109676398A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112517953A (en) * | 2020-12-01 | 2021-03-19 | 济南鞍顺齿条有限公司 | Automatic drilling equipment for rack |
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|---|---|---|---|---|
| CN101011787A (en) * | 2007-01-31 | 2007-08-08 | 黄开元 | Processing method and apparatus for rack |
| CN101020260A (en) * | 2007-03-15 | 2007-08-22 | 马俊国 | Gear rack machining apparatus |
| CN103846481A (en) * | 2014-03-31 | 2014-06-11 | 浙江博雷重型机床制造有限公司 | Combined processing production line for rack steel billet |
| CN103920906A (en) * | 2014-04-29 | 2014-07-16 | 浙江博雷重型机床制造有限公司 | Drilling equipment used for drilling holes in two ends of rack |
| CN103920917A (en) * | 2014-04-29 | 2014-07-16 | 浙江博雷重型机床制造有限公司 | Milling equipment for milling two ends of rack |
| JP2016107383A (en) * | 2014-12-09 | 2016-06-20 | 株式会社ジェイテクト | Manufacturing method of rack shaft, rack shaft and milling machine |
| CN105689753A (en) * | 2014-11-28 | 2016-06-22 | 无锡市福曼科技有限公司 | Combined drilling machine tool |
| CN106475752A (en) * | 2016-12-16 | 2017-03-08 | 上海振华重工集团(南通)传动机械有限公司 | A kind of processing technology of interior gear rack |
| CN109093208A (en) * | 2018-09-30 | 2018-12-28 | 天津市鼎鑫晟达精密机床制造股份有限公司 | Numerical control gear milling machines circular rack mill teeth and positions clamping brace mechanism with dual-workpiece |
-
2019
- 2019-03-07 CN CN201910172062.3A patent/CN109676398A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101011787A (en) * | 2007-01-31 | 2007-08-08 | 黄开元 | Processing method and apparatus for rack |
| CN101020260A (en) * | 2007-03-15 | 2007-08-22 | 马俊国 | Gear rack machining apparatus |
| CN103846481A (en) * | 2014-03-31 | 2014-06-11 | 浙江博雷重型机床制造有限公司 | Combined processing production line for rack steel billet |
| CN103920906A (en) * | 2014-04-29 | 2014-07-16 | 浙江博雷重型机床制造有限公司 | Drilling equipment used for drilling holes in two ends of rack |
| CN103920917A (en) * | 2014-04-29 | 2014-07-16 | 浙江博雷重型机床制造有限公司 | Milling equipment for milling two ends of rack |
| CN105689753A (en) * | 2014-11-28 | 2016-06-22 | 无锡市福曼科技有限公司 | Combined drilling machine tool |
| JP2016107383A (en) * | 2014-12-09 | 2016-06-20 | 株式会社ジェイテクト | Manufacturing method of rack shaft, rack shaft and milling machine |
| CN106475752A (en) * | 2016-12-16 | 2017-03-08 | 上海振华重工集团(南通)传动机械有限公司 | A kind of processing technology of interior gear rack |
| CN109093208A (en) * | 2018-09-30 | 2018-12-28 | 天津市鼎鑫晟达精密机床制造股份有限公司 | Numerical control gear milling machines circular rack mill teeth and positions clamping brace mechanism with dual-workpiece |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112517953A (en) * | 2020-12-01 | 2021-03-19 | 济南鞍顺齿条有限公司 | Automatic drilling equipment for rack |
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Effective date of registration: 20190705 Address after: 422000 College Road, Daxiang District, Shaoyang City, Hunan Province Applicant after: SHAOYANG University Applicant after: SHAOYANG ZHENHUA MACHINERY FORGING FITTING Co.,Ltd. Address before: 422100 Qili Mountain Gardening Farm, Shaoyang County, Shaoyang City, Hunan Province Applicant before: SHAOYANG ZHENHUA MACHINERY FORGING FITTING Co.,Ltd. |
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Application publication date: 20190426 |
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