CN108818013A - A kind of pipeline head processing unit (plant) - Google Patents
A kind of pipeline head processing unit (plant) Download PDFInfo
- Publication number
- CN108818013A CN108818013A CN201810700438.9A CN201810700438A CN108818013A CN 108818013 A CN108818013 A CN 108818013A CN 201810700438 A CN201810700438 A CN 201810700438A CN 108818013 A CN108818013 A CN 108818013A
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- CN
- China
- Prior art keywords
- compact heap
- plant
- ground
- ring
- processing unit
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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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q3/00—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q7/00—Arrangements for handling work specially combined with or arranged in, or specially adapted for use in connection with, machine tools, e.g. for conveying, loading, positioning, discharging, sorting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q7/00—Arrangements for handling work specially combined with or arranged in, or specially adapted for use in connection with, machine tools, e.g. for conveying, loading, positioning, discharging, sorting
- B23Q7/04—Arrangements for handling work specially combined with or arranged in, or specially adapted for use in connection with, machine tools, e.g. for conveying, loading, positioning, discharging, sorting by means of grippers
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Drilling And Boring (AREA)
Abstract
The invention discloses a kind of pipe joint processing unit (plant)s, the pipe joint processing unit (plant) includes Rack Body, swivelling tool-holder, telescopic baffle, rotate holding frame, feeding device and material collecting device, Rack Body is cylindrical structure, Rack Body is horizontal positioned on the ground, circular counter bore is equipped in the upper surface of Rack Body, but the side wall of circular counter bore is successively equipped with several sliding rails at equal intervals, sliding rail is perpendicular to the ground, each sliding rail corresponds to a rotation holding frame, rotation holding frame one end is slidably connected on the slide rail, rotate holding frame and ground keeping parallelism, feeding device is equipped on the Rack Body of the surface of rotation holding frame, feeding device is clamped and connected by telescopic baffle and rotation, swivelling tool-holder is equipped in the center location of circular counter bore, material collecting device is equipped on the ground of circular counter bore.The processing method of the pipeline system of part may be implemented in the present invention, using different layers rotary body, processing while different process may be implemented, greatly improve working efficiency.
Description
Technical field
The invention belongs to technical fields of mechanical processing, and in particular to a kind of pipeline head processing unit (plant).
Background technique
Traditional pipeline head is processed with common lathe, and traditional lathe is the main work with lathe tool to rotation
The lathe of part progress turnery processing.Drill bit, reamer, reamer, screw tap, screw die and checkering tool etc. also can be used to carry out on lathe
Corresponding processing.But when utilizing traditional lathe process part can only processing one by one, needing different processing knives
It is very time-consuming and laborious also to need frequently to replace cutter when tool, can just continue after processing is completed in next step in a procedure
Operation, it is not only bothersome arduously to be also easy to cause to make mistakes, increase rejection rate, feeding and blanking trouble, it is therefore necessary to design one
The novel pipeline head processing unit (plant) of kind.
Summary of the invention
According to the above-mentioned deficiencies of the prior art, the technical problem to be solved by the present invention is to propose a kind of pipeline head processing dress
It sets, by Rack Body, swivelling tool-holder, telescopic baffle, rotation holding frame, feeding device and material collecting device, solves conventional pipelines
The problem of head processing needs to frequently replace cutter, and processing efficiency is low, has the characteristics that high in machining efficiency easy to use.
In order to solve the above-mentioned technical problem, the technical solution adopted by the present invention is：A kind of pipe joint processing unit (plant) includes
Rack Body, swivelling tool-holder, telescopic baffle, rotation holding frame, feeding device and material collecting device, Rack Body are cylindrical structure, machine
Frame body is horizontal positioned on the ground, is equipped with circular counter bore in the upper surface of Rack Body, but the side wall of circular counter bore is successively at equal intervals
Equipped with several sliding rails, sliding rail is perpendicular to the ground, the corresponding rotation holding frame of each sliding rail, the sliding of rotation holding frame one end
On the slide rail, rotation holding frame and ground keeping parallelism are equipped with feeding on the Rack Body of the surface of rotation holding frame for connection
Device, feeding device are clamped and connected by telescopic baffle and rotation, swivelling tool-holder are equipped in the center location of circular counter bore, in circle
The ground of shape counterbore is equipped with material collecting device.
As a preferred embodiment, rotation clamping is shelved including driving motor, frame arm, bearing and activity clamping
Head, the tail end of frame arm are slidably connected on the slide rail, and the front end of frame arm is equipped with shoving hole, and the bottom of shoving hole is vertically equipped with electricity
The side wall of dynamic push rod, frame arm is equipped with tapping hole, and tapping hole is connected with shoving hole, tapping hole upward with the bottom of feeding device
Alignment, is symmetrically arranged with two telescopic baffles in tapping hole two sides, and two telescopic baffles are perpendicular to the ground, installs in the front end of frame arm
There is movable clamping head, movable clamping head is rotatablely connected by bearing and frame arm, shoving hole and movable clamping head in frame arm
It is connected, is additionally provided with driving motor in the lateral wall of frame arm, driving motor and movable clamping head are rotatablely connected.Movable clamping head
Including clamping substrate ring, compact heap, ejection ring body and gear ring, clamping substrate ring is rotatably connected in frame arm by bearing,
The inner wall of clamping substrate ring is connected with the shoving hole of frame arm, is uniformly provided on the inner wall same plane of clamping ring base
Three compact heap mounting holes, compact heap vertical sliding are mounted in compact heap mounting hole, in compact heap and compact heap mounting hole
Between be equipped with reset spring, compact heap towards clamping ring base outer wall one side be a slope, clamp ring base outer wall on
Equipped with ejection ring body, lateral wall of the ejection ring body sliding sleeve in clamping matrix, the slope phase mutual connection of ejection ring body and compact heap
Touching, gear ring are connect with driving motor by gear drive.Compact heap is equipped on one side towards clamping ring base inner wall for increasing
The embossing of frictional force.Feeding device includes storage warehouse, electrically operated valve and push-pull rod, under material bin bottom is equipped with control material successively
The electrically operated valve fallen, the electrically operated valve are located at right above frame arm tapping hole, and storage warehouse side wall is equipped with push-pull rod, push-pull rod packet
Electric hydaulic telescopic rod and U-shaped head are included, electric hydaulic telescopic rod is vertically fixed on the side wall of storage warehouse, in electric hydaulic telescopic rod
Front end sliding be equipped with U-shaped head.Swivelling tool-holder includes rotary body, flexible knife rest and cutter head, and there are four rotary bodies, stacks gradually and turns
The dynamic shaft core position that Rack Body circular counter bore is set, it is successively radial flexible equipped with several at equal intervals in rotation body sidewall
Knife rest, the knife rest that stretches is parallel to the ground, is equipped with cutter head on the top of flexible knife rest.
Present invention has the advantages that:Band processing materials in storage warehouse of the present invention are sent into tapping hole, while the U on push-pull rod
Type head is just stuck on ejection ring, rotation holding frame be moved downwardly to formulate position, U-shaped head also move downward therewith always with push away
Apical ring contact, push-pull rod are pushed forward ejection ring by U-shaped head and unclamp compact heap, and the electric pushrod in shoving hole pushes to be processed
Material pass through rotation clamping shelve, push-pull rod pull back ejection annulus move compact heap tightening, object to be processed is fixed, driving electricity
Machine rotation then drives rotation clamping to shelve high-speed rotation, and swivelling tool-holder turns to as needed carries out machining to drink cutter head,
When a step chip is good, the next cutter head of swivelling tool-holder swivel becket carries out the machining of next step, successively carries out in this way, processes
The material processed is released and collected after the completion, several cutters work at the same time, and part is sequentially processed, and the stream of part may be implemented
The processing method of line type, while different layers rotary body is used, processing while different process may be implemented, greatly improve
Working efficiency.
Detailed description of the invention
Content expressed by this specification attached drawing and the label in figure are briefly described below：
Fig. 1 is the structure chart of pipeline head processing unit (plant) specific embodiment of the invention；
Fig. 2 is the structure chart that specific embodiment is shelved in rotation clamping of the invention；
Fig. 3 is the structure chart of movable clamping head specific embodiment of the invention；
Fig. 4 is the structure chart of feeding device specific embodiment of the invention.
Wherein, 1, Rack Body, 2, feeding device, 3, telescopic baffle, 4, sliding rail, 5, rotation holding frame, 6, rotary body, 7, knife
Head, 201, driving motor, 202, electric pushrod, 203, frame arm, 204, transmission shaft, 205, spur gear, 206, movable clamping head,
207, ejection ring, 208, gear ring, 209, bearing, 210, tapping hole, 2011, compact heap, 2012, clamping ring base, 2013, push away
Top ring, 401, storage warehouse, 402, electrically operated valve, 403, push-pull rod, 404, U-shaped head, 405, material.
Specific embodiment
Below against attached drawing, by the description of the embodiment, for example related each component of a specific embodiment of the invention
Shape, construction, the mutual alignment between each section and connection relationship, the effect of each section and working principle, manufacturing process and
Operate with method etc., is described in further detail, to help those skilled in the art to inventive concept of the invention, technology
Scheme has more complete, accurate and deep understanding.
As shown in Figs 1-4, a kind of pipeline head processing unit (plant) includes Rack Body 1, swivelling tool-holder, rotation holding frame 5, feeding dress
2 and material collecting device are set, Rack Body 1 is cylindrical structure, and Rack Body 1 is horizontal positioned on the ground, sets in the upper surface of Rack Body 1
There is circular counter bore, but the side wall of circular counter bore is successively equipped with several sliding rails 4 at equal intervals, sliding rail 4 is perpendicular to the ground, the cunning of optimization
There are six rails 4, and rotation holding frame 5 is also six, and the corresponding rotation holding frame 5 of each sliding rail 4 rotates 5 one end of holding frame
It is slidably connected on sliding rail 4, is equipped with fixed card buckle in rotation 5 side wall of holding frame, the side wall that fixed card buckle is stuck in sliding rail 4 realizes rotation
Turn 5 stationary positioned of holding frame, rotation holding frame 5 and ground keeping parallelism, on the Rack Body 1 of the surface of rotation holding frame 5
Equipped with feeding device 2, feeding device 2 is clamped and connected by telescopic baffle 3 with rotation, is equipped with rotation in the center location of circular counter bore
Turret is equipped with material collecting device on the ground of circular counter bore.
Rotation clamping is shelved including driving motor 201, frame arm 203, transmission shaft 204 and movable clamping head 206, frame arm
203 tail end is slidably connected on sliding rail 4, and the front end of frame arm 203 is equipped with shoving hole, and the bottom of shoving hole is vertically equipped with electronic
Push rod 202, the side wall of frame arm 203 are equipped with tapping hole 210, and tapping hole 210 is connected with shoving hole, tapping hole 210 upward with
The bottom of feeding device 2 is aligned, and is symmetrically arranged with two telescopic baffles 3 in 210 two sides of tapping hole, two telescopic baffles 3 hang down with ground
Directly, movable clamping head 206 is installed in the front end of frame arm 203, movable clamping head 206 passes through bearing 209 and 203 turns of frame arm
Dynamic connection, the shoving hole in frame arm 203 are connected with activity clamping head 206, by material 405 to be processed from tapping hole 210
In be put into shoving hole, material 405 to be processed is pushed to movable clamping head 206 and is fastened and fixed by the advance of electric pushrod 202
Processing is additionally provided with driving motor 201, the rotation of 201 driving activity clamping head 206 of driving motor in the lateral wall of frame arm 203.
Movable clamping head 206 includes clamping substrate ring, compact heap 2011, ejection ring 207 and gear ring 208, clamps matrix
Ring is rotatably connected in frame arm 203 by bearing 209, and clamping substrate ring can be in 203 front end of frame arm along axis rotation, folder
The inner wall for holding substrate ring is connected with the shoving hole of frame arm 203, and the material 405 in shoving hole can push to clamping base
The inner wall of body ring is uniformly provided with three 2011 mounting holes of compact heap on the inner wall same plane of clamping ring base 2012, presses
Tight 2011 vertical sliding of block is mounted in 2011 mounting hole of compact heap, between in 2011 mounting hole of compact heap 2011 and compact heap
Equipped with reset spring, for holding compact heap 2011, driving motor 201 drives spur gear 205 to rotate by transmission shaft 204, directly
208 engaged transmission of gear 205 and gear ring.
Compact heap 2011 is equipped with the embossing for increasing friction force towards clamping 2012 inner wall of ring base on one side, in compact heap
The one side of 2011 direction clamping 2012 outer walls of ring base is a slope, and clamping 2012 outer wall of ring base is equipped with ejection ring body
2013, lateral wall of 207 sliding sleeve of ejection ring in clamping matrix, the slope phase mutual connection of ejection ring body 2013 and compact heap 2011
Touching steps up function when ejection ring body 2013 will drive compact heap 2011 and move up and down realization when clamping matrix lateral wall and moving back and forth
Energy.
Feeding device 2 includes storage warehouse 401, electrically operated valve 402 and push-pull rod 403, and 405 orlop portion of material is equipped with control object
The electrically operated valve 402 that material 405 successively falls, the electrically operated valve 402 are located at right above 203 tapping hole of frame arm 210, storage warehouse
401 side walls are equipped with push-pull rod 403, and push-pull rod 403 includes electric hydaulic telescopic rod and U-shaped head 404, and electric hydaulic telescopic rod is vertical
It is fixed on the side wall of storage warehouse 401, and is connect by way of electrical connection with controller, it is sliding in the front end of electric hydaulic telescopic rod
Dynamic to be equipped with U-shaped head 404, U-shaped head 404 can be by the package of ejection ring 207 covering on clamping head, and U-shaped head 404 and ejection ring 207 are sliding
Dynamic contact, the back-and-forth motion of electric hydaulic telescopic rod can drive ejection ring 207 to be moved forward and backward in clamping substrate ring, realize lock
Tight and release.
Swivelling tool-holder includes rotary body 6, flexible knife rest and cutter head 7, and there are four stack gradually the machine of being rotatably arranged on to rotary body 6
The shaft core position of 1 circular counter bore of frame body, it is successively radial equipped with several flexible knife rests at equal intervals in 6 side wall of rotary body, it stretches
Contracting knife rest is parallel to the ground, is equipped with cutter head 7 on the top of flexible knife rest, can according to need and different cutter tips 7 is arranged.
Working principle：First 405 batch of material is placed in the storage warehouse 401 of feeding device 2, at this time feeding device 2
Electrically operated valve 402 is directed at the tapping hole 210 in frame arm 203, while the U-shaped head 404 on push-pull rod 403 is just stuck in ejection ring
On 207, rotation holding frame 5 moves downward U-shaped head 404 and also moves downward therewith to be contacted with ejection ring 207 always, electrically operated valve
402 open, and material 405 to be processed falls into shoving hole by tapping hole 210, and push-pull rod 403 is pushed forward ejection by U-shaped head 404
Ring 207 unclamps compact heap 2011, and the electric pushrod 202 in shoving hole pushes material 405 to be processed to pass through rotation clamping
Shelve, push-pull rod 403 pull back ejection ring 207 drive compact heap 2011 tighten, object to be processed is fixed, 201 turns of driving motor
Dynamic then rotation clamping is driven to shelve high-speed rotation, swivelling tool-holder turns to as needed carries out machining to drink cutter head 7, when one
When step chip is good, the next cutter head 7 of swivelling tool-holder swivel becket carries out the machining of next step, successively carries out, processes in this way
The material 405 processed is released and collected after, the processing method of the pipeline system of part may be implemented, several cutters are simultaneously
Work, part are sequentially processed, while using different layers rotary body 6, and processing while different process may be implemented, and are greatly improved
Working efficiency.
The present invention is exemplarily described above in conjunction with attached drawing, it is clear that the present invention implements not by aforesaid way
Limitation, as long as the improvement for the various unsubstantialities that the inventive concept and technical scheme of the present invention carry out is used, or without changing
It is within the scope of the present invention into the conception and technical scheme of the invention are directly applied to other occasions.This hair
Bright protection scope should be determined by the scope of protection defined in the claims.
Claims (6)
1. a kind of pipe joint processing unit (plant), which is characterized in that the pipe joint processing unit (plant) includes Rack Body (1), rotation
Knife rest, telescopic baffle (3), rotation holding frame (5), feeding device (2) and material collecting device, Rack Body (1) are cylindrical structure, machine
Frame body (1) is horizontal positioned on the ground, is equipped with circular counter bore in the upper surface of Rack Body (1), but the side wall of circular counter bore is successively
It is equipped with several sliding rails (4) at equal intervals, sliding rail (4) is perpendicular to the ground, the corresponding rotation holding frame (5) of each sliding rail (4),
Rotation holding frame (5) one end is slidably connected on sliding rail (4), rotation holding frame (5) and ground keeping parallelism, in rotation holding frame
(5) Rack Body (1) of surface is equipped with feeding device (2), and feeding device (2) is clamped by telescopic baffle (3) and rotation
Connection is equipped with swivelling tool-holder in the center location of circular counter bore, is equipped with material collecting device on the ground of circular counter bore.
2. pipe joint processing unit (plant) according to claim 1, which is characterized in that the rotation clamping is shelved including driving
Motor (201), frame arm (203), bearing (209) and movable clamping head (206), the tail end of frame arm (203) are slidably connected at
On sliding rail (4), the front end of frame arm (203) is equipped with shoving hole, and the bottom of shoving hole is vertically equipped with electric pushrod (202), rack
The side wall of arm (203) is equipped with tapping hole (210), and tapping hole (210) is connected with shoving hole, tapping hole (210) upward with feeding
The bottom of device (2) is aligned, and is symmetrically arranged with two telescopic baffles (3), two telescopic baffles (3) and ground in tapping hole (210) two sides
Face is vertical, is equipped with movable clamping head (206) in the front end of frame arm (203), and movable clamping head (206) passes through bearing (209)
It is rotatablely connected with frame arm (203), the shoving hole in frame arm (203) is connected with movable clamping head (206), in frame arm
(203) lateral wall is additionally provided with driving motor (201), and driving motor (201) and movable clamping head (206) are rotatablely connected.
3. pipe joint processing unit (plant) according to claim 2, which is characterized in that it is described activity clamping head (206) include
Substrate ring, compact heap (2011), ejection ring body (2013) and gear ring (208) are clamped, clamping substrate ring is turned by bearing (209)
Dynamic to be connected on frame arm (203), the inner wall for clamping substrate ring is connected with the shoving hole of frame arm (203), in clamping ring group
Three compact heap (2011) mounting holes, compact heap (2011) vertical sliding are uniformly provided on the inner wall same plane of body (2012)
It is mounted in compact heap (2011) mounting hole, is equipped between in compact heap (2011) and compact heap (2011) mounting hole and resets bullet
Spring is a slope in the one side of compact heap (2011) towards clamping ring base (2012) outer wall, and clamping ring base (2012) is outside
Wall is equipped with ejection ring body (2013), lateral wall of ejection ring body (2013) sliding sleeve in clamping matrix, ejection ring body (2013)
It contacts with each other with the slope of compact heap (2011), gear ring (208) is connect with driving motor (201) by gear drive.
4. pipe joint processing unit (plant) according to claim 3, which is characterized in that compact heap (2011) the direction clamping
Ring base (2012) inner wall is equipped with the embossing for increasing friction force on one side.
5. pipe joint processing unit (plant) according to claim 1, which is characterized in that the feeding device (2) includes storage
Storehouse (401), electrically operated valve (402) and push-pull rod (403), material (405) orlop portion are equipped with what control material (405) was successively fallen
Electrically operated valve (402), the electrically operated valve (402) are located at right above frame arm (203) tapping hole (210), storage warehouse (401) side
Wall is equipped with push-pull rod (403), and push-pull rod (403) includes electric hydaulic telescopic rod and U-shaped head (404), and electric hydaulic telescopic rod hangs down
It is directly fixed on the side wall of storage warehouse (401), sliding is equipped with U-shaped head (404) in the front end of electric hydaulic telescopic rod.
6. pipe joint processing unit (plant) according to claim 1, which is characterized in that the swivelling tool-holder includes rotary body
(6), stretch knife rest and cutter head (7), and there are four rotary bodies (6), stacks gradually the axis for being rotatably arranged on Rack Body (1) circular counter bore
Heart position, successively radial equipped with several flexible knife rests at equal intervals in rotary body (6) side wall, the knife rest that stretches is flat with ground
Row is equipped with cutter head (7) on the top of flexible knife rest.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810700438.9A CN108818013A (en) | 2018-06-29 | 2018-06-29 | A kind of pipeline head processing unit (plant) |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810700438.9A CN108818013A (en) | 2018-06-29 | 2018-06-29 | A kind of pipeline head processing unit (plant) |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108818013A true CN108818013A (en) | 2018-11-16 |
Family
ID=64134105
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810700438.9A Pending CN108818013A (en) | 2018-06-29 | 2018-06-29 | A kind of pipeline head processing unit (plant) |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108818013A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110281008A (en) * | 2019-07-02 | 2019-09-27 | 中国铁建重工集团股份有限公司 | Arc-shaped rod piece pushing device |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201157976Y (en) * | 2008-03-07 | 2008-12-03 | 深圳市技工学校 | Ring array type tool storehouse of digital control lathes |
| CN107511490A (en) * | 2017-08-03 | 2017-12-26 | 安徽科创生产力促进中心有限责任公司 | A kind of lathe |
-
2018
- 2018-06-29 CN CN201810700438.9A patent/CN108818013A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201157976Y (en) * | 2008-03-07 | 2008-12-03 | 深圳市技工学校 | Ring array type tool storehouse of digital control lathes |
| CN107511490A (en) * | 2017-08-03 | 2017-12-26 | 安徽科创生产力促进中心有限责任公司 | A kind of lathe |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110281008A (en) * | 2019-07-02 | 2019-09-27 | 中国铁建重工集团股份有限公司 | Arc-shaped rod piece pushing device |
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Application publication date: 20181116 |
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| RJ01 | Rejection of invention patent application after publication |