CN206898505U - A kind of pipe part numerical control device for being used to cut major diameter length length - Google Patents
A kind of pipe part numerical control device for being used to cut major diameter length length Download PDFInfo
- Publication number
- CN206898505U CN206898505U CN201720734939.XU CN201720734939U CN206898505U CN 206898505 U CN206898505 U CN 206898505U CN 201720734939 U CN201720734939 U CN 201720734939U CN 206898505 U CN206898505 U CN 206898505U
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- China
- Prior art keywords
- rotating disk
- feed
- gear
- workpiece
- control device
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Abstract
The utility model provides a kind of pipe part numerical control device for being used to cut major diameter length length, including base (2), rotating disk is set on workpiece (22), is driven by the first drive mechanism being fixed on the base (2) bottom plate to be rotated around workpiece (22)；Feed gear is set on workpiece (22) to be driven to be rotated around workpiece (22) by the second drive mechanism, and there is a circle tooth feed gear end face.Configuration cuts mechanism (30) on rotating disk, along the feed slide (14) retreated perpendicular to axis of workpiece and the bevel gear (18) for driving feed slide (14) to retreat；The bevel gear (18) is entered or moved back by rotation driving feed slide (14) straight line in a manner of screw mechanism；It is intermeshed by feed gear end tooth；The rotating disk realizes cutter cutting, cutting with feed gear with the rotation of identical or different rotating speed, adds the thickness of processing of steel pipe, while improve production efficiency.
Description
Technical field
The utility model is related to the Numerical control cutting field to pipe part, and in particular to for major diameter, length it is long, no
Preferably clamp the numerical control device that the pipe part of rotation is cut.
Background technology
Need to use largely in multiple industry kinds such as petroleum and petrochemical industry, electromechanical installation industry, shipbuilding industry, steel tower industries
Steel pipe, need to cut off steel pipe in the fabrication process and groove processing because diameter of steel tube is bigger, typically about 50 lis
Rice or so and the above, length of steel pipe are long, several meters, or even ten several meters, and the wall thickness of steel pipe reaches tens of milliseconds, 80 millimeters of left sides of example
The right side, the processing method fixed using steel pipe rotary cutter can not meet requirement, so needing a kind of steel pipe to fix cutting tool fortune
Dynamic cutting process.
Method widely used at present mainly has three kinds：
Method one：Cut using band sawing machine, sawed and rotated by motor driven band, cut using the band saw of rotation
Cut.
Method two：One group of sliding block to be installed on the disk of rotation, cutting tool is fixed on sliding block, sliding block links with screw mandrel,
A ratchet is installed in screw mandrel end, and a collision block is installed in fixed base, and disc rotary makes ratchet mutually be hit with collision block, made
Screw mandrel produces rotation, and band movable slider advances, rotated so as to reach cutter while feeding, by steel pipe cutting.
Method three：Directly controlled using electronic, motor and feed arrangement and motor are mounted directly on a rotary disc, led to
Carbon brush mechanism is crossed to link with external power source.Feeding and disc rotary in outside control cutter, reach the purpose of steel pipe cutting.
But there is the shortcomings that different in three of the above method：
The defects of method one：Rotation is sawed by band to be cut, because can not be too fast with saw speed, cause due to band sawing machine
This cutting way efficiency is low, and it is inadequate to cut cutting precision, and otch can only be flat mouth.
The defects of method two：Tool feeding is driven to reach feed effect, which control by the shock of ratchet and collision block
System trouble, security is low, and machining accuracy and process velocity are not easily controlled.
The defects of method three：Due to being using electronic directly control, motor and feed arrangement and motor are directly installed on
On rotating circular disk, linked by carbon brush mechanism and external power source.Feeding and disc rotary in outside control cutter.Which knot
Structure is complicated, and probability of failure is high, and fears the working environment of humidity, easily produces electric leakage, and security performance is low.
Utility model content
The utility model provides a kind of new quick numerically controlled steel pipe cut-out groove equipment, can be by steel pipe fast shut-off simultaneously
Two retaining wall on slope are completed in two fractures of steel pipe, and the equipment can install much knives tool simultaneously while process, and can be simultaneously
It is as follows using different process tools, concrete scheme：
A kind of pipe part numerical control device for being used to cut major diameter length length, including：
Base, it is nested with circular pipe workpiece external diameter the base geo-stationary, there is the bottom plate perpendicular to axis of workpiece
With the structure of one section of axle sleeve；
Rotating disk, be set on workpiece, the rotating disk by the first drive mechanism for being fixed on the base plate drive with
Rotated around workpiece；
Feed gear, it is set on workpiece, the feed gear is by the second driving machine for being fixed on the base plate
Structure is driven to be rotated around workpiece, and there is a circle tooth feed gear end face；
A secondary cutting mechanism is at least configured on rotating disk, the cutting mechanism, which includes end, has cutter along perpendicular to workpiece
The bevel gear that the feed slide and drive feed slide that axis is retreated are retreated；The bevel gear is driven in a manner of screw mechanism by rotation
Dynamic feed slide straight line enters or moved back；
The feed gear end tooth is intermeshed with the bevel gear；
The rotating disk is nested with the axle sleeve section in the base by bearing respectively with feed gear, with identical or different rotating speed
Rotation, the rotating disk are constant in the distance of axis direction with feed gear.
The utility model employs the principle of screw, rotational lead screw --- screw mechanism, drive nut --- feed
Slide, including the cutter of front end move ahead or retreated progress cutting action.
The rotation of the leading screw is intermeshed by the end tooth of feed gear with the bevel gear on the leading screw, is stirred and is turned
It is dynamic.
Two gear wheel disk components --- rotating disk and feed gear in base axle sleeve section are nested with, when two gear wheel
Disk rotating speed is identical, both geo-stationaries, and without output action, and when two canine tooth wheel disc rotating speeds are different, both meetings produce relatively past
Action that is preceding or rotating backward, the end tooth of feed gear will stir bevel gear and rotate forward or backwards, respective drive cutter
Feeding retreats.
Two canine tooth wheel discs are driven by the first drive mechanism being fixed on base plate and the second drive mechanism respectively.
Further,
First drive mechanism includes being fixed on first servo parallel with axis of workpiece of rotating shaft on the base plate
Motor and the shaft-driven travelling gear of output, then disk part described in engaged transmission；
For the rotating disk in being connected and composed among two disks by circular shaft, a disk is periphery peripheral teeth wheel disc with teeth,
With the travelling gear engaged transmission, another disk is the outer disc that outer face is fixed with the cutting mechanism；
Second drive mechanism includes being fixed on second servo parallel with axis of workpiece of rotating shaft on the base plate
One circle tooth of motor and shaft-driven second travelling gear of output, then feed gear end face described in engaged transmission；
The axis hole at the feed gear center is rotationally nested on the circular shaft among the rotating disk, and by the rotating disk
Placing restrictions on for two disks is axially immovable.
Further,
The feed slide of the cutting mechanism is with along radially displaceable the outer end for being fixed on the rotating disk of the rotating disk
Face；
The bevel gear is configured on ball-screw, both ends are configured in bearing block by roller bearing, and the bearing block is consolidated
Be scheduled on the outer face of the rotating disk, and be bonded feed slide internal chamber wall can diametrically moving along the rotating disk；
One section of the ball-screw is coordinated with thread forms with feed slide inwall to be contacted.
Further, the outer face of the rotating disk configuration feed slide bevel gear at open up for bevel gear with it is described enter
The exposed hole that cutter tooth wheel end face is meshed.
Further, the both sides of the feed slide set clamp rail, limit the feed slide only along the rotating disk
Move radially.
Further, the bearing block is bolted in the rotating disk outer face.
Further, the feed gear can be by periphery feed spur gear with teeth and end face feed face gear with teeth
Two parts, which axially merge, to be made.
Further, it is being additionally provided with sliding axle between the circular shaft part of the rotating disk and the central shaft hole of feed gear
Hold.
Further, the inner ring of the bearing is set in the axle sleeve section of base, the central shaft of the circular shaft section of the rotating disk
Borehole jack is located on the outer ring of the bearing.
Further, circumferential uniformly 2,3,4, the 5 or 6 secondary cutting mechanisms of configuration on the rotating disk.
Mechanical gear structure is used between the utility model cutting rotation and feed arrangement, by rotary turnplate gear and is entered
Cutter tooth wheel, them are made to produce a rotary speed difference in rotary course kind to realize the feeding of cutting tool and retrogressing, and two drive
Motivation structure is arranged on outside, and the equipment is controlled in outside.
Because installation of the cutter mechanism on disk is not influenceed by angle, so more set cuttings can be installed on rotating disk
Mechanism, realize that installation is more cutting tool layered cutting, considerably increase steel pipe processes thickness and kerf, angle,
Greatly promote production efficiency.
More than one piece cutting mechanism cutter on rotating disk synchronously moves radially around rotating disk, cutting stress balance, processing
Precision is high, impacts small, long lifespan to device.
The cutting action that screw principle driving feed slide is retreated is employed, selects appropriate pitch, action is fine, work
Make steady, machining accuracy height.
Driving is mechanically anchored on static base, easy for operation, safety.
Single unit system provided by the utility model is clear in structure, succinct, makes, processes simply, cost is low, is easy to popularization to make
With generation good economic and social benefit.
Brief description of the drawings
, below will be to embodiment or prior art in order to illustrate more clearly of the technical scheme in the embodiment of the utility model
The required accompanying drawing used is briefly described in description.
Fig. 1 is a kind of configured in one piece structure for being used to cut the pipe part numerical control device of major diameter length length of the utility model
Schematic diagram；
Fig. 2 is a kind of embodiment of the present utility model, it is shown that disk part outer face is configured with fourth officer cutting mechanism
Structural representation；
Fig. 3 and Fig. 4 is the utility model partial enlarged drawing in one embodiment, show respectively the first drive mechanism and the
The structural representation that two drive mechanisms are combined and transmitted with related components；
Fig. 5 a are the utility model configuration schematic diagram of base and rolling bearing in one embodiment；
Fig. 5 b are the profile of the utility model disk part in one embodiment；
Fig. 5 c be the utility model in one embodiment the first drive mechanism drive disk part structural representation；
Fig. 5 d are the schematic diagram of the utility model cutting mechanism in one embodiment；
Fig. 5 e are that numerical control device provided by the utility model the first transmission mechanism and is provided with one and entered in one embodiment
The configuration schematic diagram of cutter mechanism；
Fig. 5 f be the utility model in one embodiment the second servomotor and output shaft drive the second travelling gear after
And engage the configuration schematic diagram of feed gear；
Fig. 5 g are the schematic diagram of the utility model cutting mechanism feed/withdrawing in one embodiment；
Fig. 6 is a kind of embodiment of the present utility model, it is shown that the first servo electricity is configured with the base plate part of base
The structural representation of machine and the second servomotor.
In figure, 1 it is the first servomotor, 2 is base, 3 is travelling gear, 4 is peripheral teeth wheel disc, 5 is bearing, 6 is outer
Disk, 8 be the second servomotor, 9 be the second travelling gear, 10 be feed spur gear, 11 be sliding bearing, 12 be feed end face
Gear, 14 be feed slide, 15 be bearing block, 16 be roller bearing, 18 be bevel gear, 19 be ball-screw, 20 be cutter, 30
It is cutting mechanism, 31 is clamp rail.
Embodiment
In order to understand the utility model in more detail, by it is following be described in conjunction with the accompanying detailed structure and action step so as to
Understanding to technical scheme.
The utility model provides a kind of pipe part numerical control device for being used to cut major diameter length length, including：
Base 2, it is nested with the external diameter of circular pipe workpiece 22 geo-stationary of base 2, has perpendicular to the axis of workpiece 22
Bottom plate and one section of axle sleeve structure；
Rotating disk, it is set on workpiece 22, the rotating disk is driven by the first drive mechanism being fixed on the bottom plate of base 2
To be rotated around workpiece 22；
Feed gear, it is set on workpiece 22, the feed gear is driven by be fixed on the bottom plate of base 2 second
Mechanism is driven to be rotated around workpiece 22, and there is a circle tooth feed gear end face；
At least configure a secondary cutting mechanism 30 on rotating disk, the cutting mechanism 30, which includes end, has cutter 20 along vertical
The feed slide 14 retreated in axis of workpiece and the bevel gear 18 for driving feed slide 14 to retreat；The bevel gear 18 is with leading screw machine
Structure mode is entered or moved back by the straight line of rotation driving feed slide 14；
The feed gear end tooth is intermeshed with the bevel gear 18；
The rotating disk is nested with the axle sleeve section in the base 2 by bearing 5 respectively with feed gear, with identical or different turn
Speed rotation, the rotating disk are constant in the distance of axis direction with feed gear.
First drive mechanism includes being fixed on the first servo that rotating shaft is parallel with axis of workpiece on the bottom plate of base 2
Motor 1 and the shaft-driven travelling gear 3 of output, then disk part described in engaged transmission；
For the rotating disk in being connected and composed among two disks by circular shaft, a disk is periphery peripheral teeth wheel disc 4 with teeth,
With the engaged transmission of travelling gear 3, another disk is the outer disc 6 that outer face is fixed with the cutting mechanism；
Second drive mechanism includes being fixed on the second servo that rotating shaft is parallel with axis of workpiece on the bottom plate of base 2
One circle tooth of motor 8 and shaft-driven second travelling gear 9 of output, then feed gear end face described in engaged transmission；
The axis hole at the feed gear center is rotationally nested on the circular shaft among the rotating disk, and by the rotating disk
Placing restrictions on for two disks (i.e. peripheral teeth wheel disc 4 and outer disc 6) is axially immovable.
By the i.e. steel pipe strap of workpiece 22 in chuck 21.
The structure configuration of the technical program, can ensure disk part described in the engaged transmission of the first servomotor 1, second watches
Take feed gear described in the engaged transmission of motor 8, the rotating speeds of two servomotors can be caused disk part and entered with identical or different
The rotating speed of cutter tooth wheel is identical or different.The cutter 20 on cutting mechanism can be caused to feed or retreat.
Such structure configuration, it can ensure that disk part and feed gear can surround the axis of rotating disk, namely workpiece 22
Axis rotation, but both are mutually immovable in axis direction.
The feed slide 14 of the cutting mechanism along the radially displaceable of the rotating disk to be fixed on the outer of the rotating disk
End face；
The bevel gear 18 is configured on ball-screw 19, both ends are configured in bearing block 15 by roller bearing 16, described
Bearing block 15 is fixed on the outer face of the rotating disk, and be bonded the internal chamber wall of feed slide 14 can moving radially along the rotating disk；
One section of the ball-screw 19 is coordinated with thread forms with the inwall of feed slide 14 to be contacted.
Such structure, ensure the rotation of the ball-screw 19, can cause to have the feed slide 14 of cutter 20 along institute
State the footpath of rotating disk forward or backward.
The outer face of the rotating disk is opened up for bevel gear 18 and the feed at the bevel gear 18 of configuration feed slide 14
The exposed hole that gear face is meshed.
In order that ball-screw 19 can be run reliablely, the roller bearing 16 and bearing block 15 of fixed leading screw are necessary
Configure at leading screw both ends, being bound to bevel gear 18 will be between both ends roller bearing 16 and bearing block 15, in order to not influence umbrella tooth
Wheel 18 engages with a circle tooth of the feed gear end face, therefore, it is necessary in the outer face of the rotating disk, i.e. feed face gear
12 corresponding position opens up corresponding exposed hole, generally rectangular cross-section hole.
The both sides of the feed slide 14 set clamp rail 31, limit the feed slide 14 only along the footpath of the rotating disk
To movement.In order to allow the feed slide 14 only moving radially along the rotating disk, folder can be set in the both sides of feed slide 14
Hold guide rail 31.As needed, along the circumference of rotating disk, how secondary cutting mechanism, namely how secondary feed slide 14 and clamping can be configured
Guide rail 31.
The bearing block 15 is bolted in the rotating disk outer face.The bearing block 15 is immovable, therefore by spiral shell
Bolt is fixed on the rotating disk outer face.But this fixed form can not influence that " bearing block 15 is fixed on the outer of the rotating disk
End face, and be bonded the internal chamber wall of feed slide 14 can diametrically moving along the rotating disk ".
The feed gear can be by periphery feed spur gear 10 with teeth and end face feed face gear 12 two with teeth
Split axle makes to merging.For the ease of making and assembling use, the feed gear can be fabricated to axially two parts in the form of annular discs and use again
Bolt etc joint forming.
Sliding bearing 11 is additionally provided between the circular shaft part of the rotating disk and the central shaft hole of feed gear.In order to carry
In the life-span of high rotating disk and feed gear, service precision, set sliding bearing 11 more favourable at mutual cooperation, the sliding bearing
11 can be cylindrical, also can one end have outward flanging shape, need to ensure that the central shaft hole of feed gear is nested with the rotating disk in a word
Circular shaft section on, can not axially have movement.
The inner ring of the bearing 5 is set in the axle sleeve section of base, and the central shaft hole of the circular shaft section of the rotating disk is set in
On the outer ring of the bearing 5.
The rotating disk is set in a manner of bearing 5 in the axle sleeve section of base 2 so that two canine tooths of rotating disk and feed gear
The axis that disk component is taken turns around workpiece 22 rotates.
The circular pipe workpiece 22 is steel pipe.This patent is suitable for tubular workpiece of the processing with certain wall thickness, such as diameter
20 to 150cm steel pipes.
Circumferential uniformly 2,3,4, the 5 or 6 secondary cutting mechanisms 30 of configuration on the rotating disk.In actual applications, can install
More set cutting mechanisms, as shown in Fig. 2 being provided with 4 sets of cutting mechanisms 30 on outer disc 6.Cutter may be selected to cutting or groove
Knife, you can complete the retaining wall on slope at steel pipe both ends, other special process cutters can also be installed according to actual requirement.More set cuttings
Mechanism realizes cutter cutting, cutting multimode, fast progress, adds the thickness of processing of steel pipe, while improve production efficiency.
More set cutting mechanisms circumferential uniformly configuration as far as possible so that space utilization is preferable, also advantageous arrangement uniform force, extends
Service life of equipment.
Claims (10)
- A kind of 1. pipe part numerical control device for being used to cut major diameter length length, it is characterised in that including：Base (2), it is nested with circular pipe workpiece (22) external diameter base (2) geo-stationary, has perpendicular to workpiece (22) The structure of the bottom plate of axis and one section of axle sleeve；Rotating disk, it is set on workpiece (22), the rotating disk is driven by the first drive mechanism being fixed on the base (2) bottom plate To be rotated around workpiece (22)；Feed gear, it is set on workpiece (22), the feed gear is driven by be fixed on the base (2) bottom plate second To be rotated around workpiece (22), there is a circle tooth feed gear end face for mechanism driving；At least configure a secondary cutting mechanism (30) on rotating disk, the cutting mechanism (30), which includes end, has cutter (20) along hanging down The feed slide (14) directly retreated in axis of workpiece and the bevel gear (18) for driving feed slide (14) to retreat；The bevel gear (18) entered or moved back by rotation driving feed slide (14) straight line in a manner of screw mechanism；The feed gear end tooth is intermeshed with the bevel gear (18)；The rotating disk is nested with the axle sleeve section in the base (2) by bearing (5) respectively with feed gear, with identical or different turn Speed rotation, the rotating disk are constant in the distance of axis direction with feed gear.
- 2. the pipe part numerical control device as claimed in claim 1 for being used to cut major diameter length length, it is characterised in thatFirst drive mechanism includes being fixed on the first servo electricity that rotating shaft is parallel with axis of workpiece on the base (2) bottom plate Machine (1) and the shaft-driven travelling gear (3) of output, then disk part described in engaged transmission；For the rotating disk in being connected and composed among two disks by circular shaft, a disk is periphery peripheral teeth wheel disc (4) with teeth, with Travelling gear (3) engaged transmission, another disk are the outer disc (6) that outer face is fixed with the cutting mechanism；Second drive mechanism includes being fixed on the second servo electricity that rotating shaft is parallel with axis of workpiece on the base (2) bottom plate One circle tooth of machine (8) and shaft-driven second travelling gear (9) of output, then feed gear end face described in engaged transmission；The axis hole at the feed gear center is rotationally nested on the circular shaft among the rotating disk, and by the rotating disk two Placing restrictions on for disk is axially immovable.
- 3. the pipe part numerical control device as claimed in claim 1 for being used to cut major diameter length length, it is characterised in thatThe feed slide (14) of the cutting mechanism is with along radially displaceable the outer end for being fixed on the rotating disk of the rotating disk Face；The bevel gear (18) is configured on ball-screw (19), both ends are configured in bearing block (15) by roller bearing (16), The bearing block (15) is fixed on the outer face of the rotating disk, and be bonded feed slide (14) internal chamber wall can be along the footpath of the rotating disk To relative movement；One section of the ball-screw (19) is coordinated with thread forms with feed slide (14) inwall to be contacted.
- 4. the pipe part numerical control device as claimed in claim 3 for being used to cut major diameter length length, it is characterised in thatThe outer face of the rotating disk configuration feed slide (14) bevel gear (18) place open up for bevel gear (18) with it is described enter The exposed hole that cutter tooth wheel end face is meshed.
- 5. the pipe part numerical control device as claimed in claim 3 for being used to cut major diameter length length, it is characterised in thatThe both sides of the feed slide (14) set clamp rail (31), limit the feed slide (14) only along the rotating disk Move radially.
- 6. the pipe part numerical control device as claimed in claim 3 for being used to cut major diameter length length, it is characterised in that the axle Bearing (15) is bolted in the rotating disk outer face.
- 7. the as claimed in claim 2 pipe part numerical control device for being used to cut major diameter length length, it is characterised in that it is described enter Cutter tooth wheel can axially be merged by periphery feed spur gear (10) with teeth and end face feed face gear (12) two parts with teeth Make.
- 8. the pipe part numerical control device as claimed in claim 2 for being used to cut major diameter length length, it is characterised in that in institute State and sliding bearing (11) is additionally provided between the circular shaft part of rotating disk and the central shaft hole of feed gear.
- 9. the pipe part numerical control device as claimed in claim 2 for being used to cut major diameter length length, it is characterised in that the axle The inner ring for holding (5) is set in the axle sleeve section of base, and the central shaft hole of the circular shaft section of the rotating disk is set in the bearing (5) On outer ring.
- 10. the pipe part numerical control device as claimed in claim 1 for being used to cut major diameter length length, it is characterised in that in institute State circumferential uniformly 2,3,4,5 or 6 secondary cutting mechanisms (30) of configuration on rotating disk.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720734939.XU CN206898505U (en) | 2017-06-22 | 2017-06-22 | A kind of pipe part numerical control device for being used to cut major diameter length length |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720734939.XU CN206898505U (en) | 2017-06-22 | 2017-06-22 | A kind of pipe part numerical control device for being used to cut major diameter length length |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206898505U true CN206898505U (en) | 2018-01-19 |
Family
ID=61283913
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720734939.XU Expired - Fee Related CN206898505U (en) | 2017-06-22 | 2017-06-22 | A kind of pipe part numerical control device for being used to cut major diameter length length |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206898505U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107138807A (en) * | 2017-06-22 | 2017-09-08 | 余维维 | A kind of pipe part numerical control device for being used to cut major diameter length length |
| CN112719422A (en) * | 2020-12-30 | 2021-04-30 | 中广核核电运营有限公司 | Power type cutting device |
| CN116275312A (en) * | 2022-12-12 | 2023-06-23 | 中建八局第二建设有限公司 | Automatic steel bar straight thread threading machine for building |
-
2017
- 2017-06-22 CN CN201720734939.XU patent/CN206898505U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107138807A (en) * | 2017-06-22 | 2017-09-08 | 余维维 | A kind of pipe part numerical control device for being used to cut major diameter length length |
| CN112719422A (en) * | 2020-12-30 | 2021-04-30 | 中广核核电运营有限公司 | Power type cutting device |
| CN116275312A (en) * | 2022-12-12 | 2023-06-23 | 中建八局第二建设有限公司 | Automatic steel bar straight thread threading machine for building |
| CN116275312B (en) * | 2022-12-12 | 2023-12-19 | 中建八局第二建设有限公司 | Automatic steel bar straight thread threading machine for building |
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180119 Termination date: 20200622 |
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| CF01 | Termination of patent right due to non-payment of annual fee |