CN112536785B - Four-center-line marking device and method for long-barrel pipeline - Google Patents
Four-center-line marking device and method for long-barrel pipeline Download PDFInfo
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- CN112536785B CN112536785B CN202011334433.2A CN202011334433A CN112536785B CN 112536785 B CN112536785 B CN 112536785B CN 202011334433 A CN202011334433 A CN 202011334433A CN 112536785 B CN112536785 B CN 112536785B
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- supporting leg
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25H—WORKSHOP EQUIPMENT, e.g. FOR MARKING-OUT WORK; STORAGE MEANS FOR WORKSHOPS
- B25H7/00—Marking-out or setting-out work
- B25H7/04—Devices, e.g. scribers, for marking
- B25H7/045—Devices, e.g. scribers, for marking characterised by constructional details of the marking elements
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
Abstract
The invention relates to a four-center-line marking device and a method for a long cylinder pipeline, wherein the marking device comprises a reference support (1), supporting legs (2) and a level (3); the datum support (1) comprises a datum base (11) and a base handle (12); the level gauge (3) is arranged at the top of the base handle (12), and the supporting legs (2) are connected with the reference base (11). The marking device is ingenious in design, high in practicability, simple to manufacture, low in cost, convenient to operate and high in working efficiency, even a non-professional marking person can accurately mark four central lines of the long barrel pipeline, the difficulty of professional operation is reduced, and the marking device is convenient to operate.
Description
Technical Field
The invention relates to a four-center-line scribing device and a four-center-line scribing method for a long cylinder pipeline, in particular to a long cylinder pipeline in the manufacturing process of nuclear island equipment and a pressure container, and specifically relates to four center lines scribed at two ends of the long cylinder pipeline in the manufacturing process of the nuclear island equipment and the pressure container.
Background
"Hualongyi" is an advanced million kilowatt-level pressurized water reactor nuclear power technology developed by China nuclear industry group companies (abbreviated as Zhongke and CNNC) and China Guanghui group (abbreviated as Zhongguang and CGN) of two nuclear power enterprises in China on the basis of 30 years nuclear power scientific research, design, manufacture, construction and operation experience in China and according to Fudao nuclear accident experience feedback and the latest safety requirements in China and the world.
As a main brand for Chinese nuclear power 'going away', in the aspect of design innovation, 'Hualong I' proposes a safety design concept of 'active and passive combination', adopts a reactor core of 177 fuel assemblies, a multiple redundant safety system, single-reactor arrangement and double-layer containment vessels, comprehensively and evenly implements the design principle of 'deep defense', sets perfect serious accident prevention and mitigation measures, and has safety indexes and technical performance reaching the advanced level of the international third-generation nuclear power technology and complete independent intellectual property rights.
At present, the process that four central lines need to be drawn at two ends of a long cylinder pipeline is often involved in the manufacturing process of nuclear island equipment and pressure vessels, and the long cylinder pipeline and other workpieces are conveniently and smoothly assembled. The two ends of the existing long cylinder pipeline are generally drawn by four central lines by two drawing methods: one method is that firstly, a disc ruler sectioning method is adopted to determine four central lines at one end of a long cylinder pipeline, and then a scribing compass is used to guide the four central lines to the other end; the other method is that firstly, a disc ruler segmentation method is adopted to determine four central lines at one end of the long cylinder pipeline, then a suspension line cone method is adopted to adjust one end of the scribed four central lines to be 0-180 degrees or 90-270 degrees to be vertical to the ground, the circumference of the cylinder pipeline is equally divided and marked at the other end of the scribed four central lines in a disc ruler segmentation mode, and then the four central lines are found out in a fine adjustment mode in a suspension line cone mode. However, the cylinder pipelines in the nuclear island equipment and the pressure vessel are longer and larger than other common pipelines, certain errors exist in the two methods, the scribing process is complex, the requirement on the capability of a scribing worker is high, and common welding workers cannot accurately and effectively scribe four central lines of the pipelines.
Therefore, it is necessary to design a simple, convenient, easy-to-operate, and high-precision four-center-line scribing device for a long cylinder pipeline.
For the reasons, the invention provides a four-center-line scribing device and a four-center-line scribing method for a long cylinder pipeline, and the device is applied to cylinder pipelines in nuclear island equipment and pressure vessels for the first time.
Disclosure of Invention
In order to overcome the problems, the inventor of the invention carries out intensive research and designs the long cylinder pipeline four-center-line marking device and the method, the marking device has the advantages of ingenious design, strong practicability, simple manufacture and low cost, the marking method is convenient to operate and high in working efficiency, and even non-professional marking personnel can accurately mark the four center lines of the long cylinder pipeline, so that the invention is completed.
Specifically, one of the purposes of the invention is to provide a four-centerline marking device for a long cylinder pipeline, which comprises a reference support 1, supporting legs 2 and a level 3;
the reference support comprises a reference base and a base handle;
the spirit level is arranged at the top of the base handle, and the supporting legs are connected with the reference base.
The top of the base handle is provided with a groove, and two ends of the base are provided with sliding tooth grooves;
the gradienter is placed in a groove, and the size of the groove is 45-90 degrees;
preferably, the groove is V-shaped, the opening size is 60 degrees, and the level gauge is provided with scales.
The base handle is a telescopic rod with damping, and the gradienter is positioned at different heights by stretching up and down.
The two support legs are symmetrically arranged on two sides of the reference base;
preferably, the width of the leg is the same as the inner diameter of the sliding spline.
A threaded through hole is formed in the sliding tooth groove of the reference base;
the landing leg is provided with a threaded through hole with the same size as the hole on the sliding tooth groove, and the landing leg and the reference support are fixedly connected into a whole through bolts and nuts.
Two rows of transversely arranged thread through holes are arranged on the sliding tooth groove, and each row is uniformly provided with 4 thread through holes.
A supporting leg gear and a control gear are arranged in the reference base, and internal threads are arranged on the inner side of the supporting leg gear;
and an external thread is arranged on one side of the supporting leg, and the internal thread of the supporting leg gear is nested outside the external thread of the supporting leg.
The control gear is meshed with the leg gear 111 through a convex-concave structure of the gears;
a control handle is arranged on one side of the control gear, and the landing leg gear transversely and horizontally moves by rotating the handle;
preferably, the control handle can drive the control gear to slide longitudinally.
Another object of the present invention is to provide a method for scribing four center lines of a long cylindrical pipeline, preferably, the method for scribing four center lines of a long cylindrical pipeline according to any one of claims 1 to 7, the method comprising the steps of:
step 4, drawing a transverse center line by using a disc ruler segmentation method according to the longitudinal center line;
the step 3 comprises the following substeps:
step 3-1: marking 2 marking lines along the contact positions of the supporting legs at the two sides and the cylinder pipeline;
step 3-2: drawing the middle points of 2 marking lines, and marking the marking points at the middle points;
step 3-3: and drawing a vertical line downwards at the marking point to draw one of the four central lines.
And (5) repeating the steps 1 to 5, and drawing a transverse center line and a longitudinal center line at the other end of the long cylinder pipeline.
The invention has the advantages that:
(1) the four-center-line marking device for the long cylinder pipeline, provided by the invention, can be used for marking four center lines at two ends of the long cylinder pipeline in the manufacturing process of nuclear island equipment and pressure vessels.
(2) According to the four-center-line scribing device for the long cylinder pipeline, provided by the invention, the four center lines on two sides of the cylinder/pipeline can be ensured to be superposed, the operation is convenient, the precision is high, and the four center lines of the cylinder pipeline with the diameter of phi 400-phi 4000 can be scribed.
(3) According to the method for scribing the four central lines of the long cylinder pipeline, provided by the invention, even a non-professional scribing person can accurately scribe the four central lines of the long cylinder pipeline, so that the professional operation difficulty is reduced, and the operation is convenient.
Drawings
Fig. 1 is a schematic view showing the overall structure of a four-centerline scribing device for a long cylinder pipeline according to a preferred embodiment of the present invention;
FIG. 2 is a schematic view of the overall structure of a four-centerline scribing device for a long cylinder pipeline according to another preferred embodiment of the present invention;
FIG. 3 shows a cross-sectional view of the inside of a datum base of a long barrel pipe four centerline line marking apparatus in accordance with a preferred embodiment of the present invention;
FIG. 4 is a schematic diagram illustrating the overall structure of a reference base of a four-centerline marking device for a long cylinder pipeline according to a preferred embodiment of the invention;
FIG. 5 is a schematic top view of a base handle of a four-centerline line striper for a long cylinder pipe in accordance with a preferred embodiment of the present invention;
fig. 6 shows a schematic structural view of a leg gear of a four-centerline marking device for a long cylinder pipeline according to a preferred embodiment of the invention.
The reference numbers illustrate:
1-reference support
11-datum base
111-leg gear
112-control gear
12-base handle
121-groove
2-support leg
3-level meter
Detailed Description
The invention is explained in more detail below with reference to the figures and examples. The features and advantages of the present invention will become more apparent from the description.
The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. While the various aspects of the embodiments are presented in drawings, the drawings are not necessarily drawn to scale unless specifically indicated.
The invention provides a four-centerline marking device for a long-barrel pipeline, which comprises a reference support 1, supporting legs 2 and a level 3, and is shown in figure 1.
The reference bracket 1 comprises a reference base 11 and a base handle 12;
the level 3 is placed on top of a base handle 12 and the legs 2 are connected to a reference base 11, as shown in fig. 1-2.
The top of the base handle 12 is provided with a groove 121, and two ends of the reference base 11 are provided with sliding tooth grooves;
the level meter 3 is placed in a groove 121, and the groove 121 is provided with a dimension of 45-90 degrees; in a preferred embodiment, the groove 121 is provided in a V shape, the opening dimension is 60 degrees, and the dimensional tolerance is +/-0.01 mm, so that the scribing precision can be improved.
The level 3 is provided with a scale. The groove 121 can play a role in placing the level gauge 3 and also can play a role in fixing the level gauge 3, and the level gauge can be placed to slide down when the device is used and moved.
In a preferred embodiment, a spring clamping device may be disposed inside the groove 121, and the outer periphery of the level gauge is tightly attached to the inside of the groove 121 by the elastic force of the spring, so as to play a role of fastening the level gauge, and the level gauge does not slide relative to the reference bracket 1 during use.
The base handle 12 is a telescopic rod with damping, and the level 3 is positioned at different heights by stretching the telescopic rod up and down.
The telescopic rod is arranged to adjust the height of the level 3, when the diameter of the long cylinder pipeline is small, the range of manual operation is small, and the level 3 is kept at a low height to ensure the scribing precision; and when long barrel pipeline diameter is great, need 3 high levels of higher spirit levels just can guarantee the marking off precision, and manual operation scope is great, and low height is unsuitable practical application excessively, consequently needs to set up adjustable telescopic link.
Take damped scalable pole in this application can keep its highly difficult emergence to change after tensile, has simplified fixed step, improve equipment precision promptly, also can improve the work efficiency in the actual operation, and under the external force orders about, can resume the shrink state, increases the durability of use.
The two support legs 2 are symmetrically arranged on two sides of the reference base 11 and are matched with the reference support 1 for use;
preferably, the width of the leg 2 is the same as the inner diameter of the sliding spline.
The supporting legs 2 comprise a left supporting leg and a right supporting leg, the left supporting leg and the right supporting leg are respectively arranged at the left end and the right end of the bottom of the reference support 1, and the supporting legs can just slide in the sliding tooth grooves in a left-right parallel mode to achieve the telescopic purpose.
Through the parallel slip about landing leg 2, can be so that four central line marking device of long barrel pipeline are applicable to the barrel of different diameters, and the ratio scope of distance between the two landing legs outsides and barrel external diameter is 1: 10-1: 50.
one or more rows of threaded through holes which are transversely and uniformly arranged are arranged on the sliding tooth socket of the reference support 1, and each row is uniformly provided with 2-6 threaded through holes, as shown in figure 1;
preferably, two rows of transversely arranged threaded through holes are formed in the sliding tooth groove, and 4 threaded through holes are formed in each row of the sliding tooth groove.
The threaded through holes which are transversely and uniformly arranged can facilitate the supporting legs 2 at two sides to be fixed at symmetrical positions, and the threaded through holes at the same positions at two sides can ensure the symmetrical stretching positions of the two supporting legs 2.
When the diameter of the long cylinder pipe is small, the supporting legs 2 on the two sides are fixed in the threaded through hole close to the base handle 12, and when the diameter of the long cylinder pipe is large, the supporting legs 2 on the two sides are fixed in the threaded through hole at the far end of the base handle 12.
Two rows of transversely arranged threaded through holes can enable the connection between the reference support 1 and the supporting legs 2 to be firmer, reduce errors caused by up-down movement, reduce the friction between the inner sides of the sliding tooth grooves and the supporting legs 2, and prolong the service life of the device.
The landing leg 2 is provided with a threaded through hole with the same size as the hole on the sliding tooth groove, and the landing leg 2 and the reference support 1 are fixedly connected into a whole through bolts and nuts.
According to different pipeline diameters during the use, pull out landing leg 2 to suitable position from the slip tooth's socket, it is the same to need to guarantee that both sides pull out the position, and later use bolt and nut with landing leg 2 and 1 rigid coupling of benchmark support as an organic whole for landing leg 2 can keep fixed relative position with benchmark support 1, plays the fixed action promptly, also conveniently carries out subsequent marking off operation.
In a preferred embodiment, the reference support is machined from 30mm thick steel plate and the legs are machined from 20mm thick steel plate.
Because the position that can only set up landing leg 2 according to the position of screw through-hole when setting up the screw through-hole has certain limitation, can not adjust landing leg 2 position wantonly, consequently involves another kind of embodiment in the application, can freely adjust the lateral shifting of landing leg 2.
In another preferred embodiment, the reference base 11 is internally provided with a leg gear 111 and a control gear 112, and the inside of the leg gear 111 is provided with an internal thread, as shown in fig. 3 and 6;
preferably, the number of the leg gears 111 is the same as that of the legs 2, and the legs are in one-to-one correspondence;
an external thread is arranged on one side of the supporting leg 2, and the internal thread of the supporting leg gear 111 is nested outside the external thread of the supporting leg 2.
The control gear 112 and the leg gear 111 are meshed with each other through a convex-concave structure of the gears;
a control handle is arranged on one side of the control gear 112, and the support leg gear 111 is horizontally moved in the transverse direction by rotating the handle.
In a preferred embodiment, the internal thread of the leg gear 111 and the external thread of the leg 2 are smooth enough, and the weight of the leg 2 is large enough not to cause the rotation of the outside of the leg 2 due to friction, which can ensure that it is always vertical to the ground.
The control gear 112 can be rotated by rotating the handle, and the leg gears 111 are rotated due to the meshing action of the adjacent gears, so that the legs 2 are driven to move left and right in parallel, the moving speeds of the legs 2 on the two sides are the same, and the moving distances are symmetrical, as shown in fig. 2.
Preferably, the control handle can slide the control gear 112 longitudinally.
The control handle is provided with a buckle, and the position of the control handle is fixed through the clamping buckle, so that the position of the control gear 112 is fixed.
When the control handle is arranged at the longitudinal top end, the control gear 112 is meshed with the supporting leg gear 111, and the two supporting legs 2 can be controlled to move symmetrically at the same time; when the control handle is at the longitudinal bottom end, the control gear 112 is separated from the leg gear 111, and the distance between the two legs 2 can be independently controlled at this time, so that the function of correction at any time is achieved, and system errors caused by errors possibly caused in the manufacturing process are avoided, as shown in fig. 3-4.
In a more preferred embodiment, the number of the legs 2 is 4, 2 on each side, and the telescopic rods are arranged between the 2 legs 2 on each side, so that the parallel stretching can be carried out.
When long barrel pipeline diameter is less, the manual operation scope is little, can one-hand support equipment rule, but when long barrel pipeline diameter is great, the manual operation scope is big, and one-hand support equipment obviously does not possess the practicality, so the design has the telescopic link, with 2 parallel stretching of 2 landing legs of every side, forms four fulcrums, can increase substantially the stability of equipment. Meanwhile, when the diameter of the long cylinder pipeline is large, in order to guarantee the precision requirement, the height of the level meter 3 needs to be increased, the manual supporting equipment is difficult to keep a completely horizontal state, and an operation error in scribing is caused, and after 2 supporting legs 2 on each side are stretched in parallel, the scribing equipment is not needed, so that the stability is improved, the scribing efficiency and the equipment precision are improved, and the synergistic effect is achieved.
According to the scribing method provided by the invention, the four-centerline scribing device for the long cylinder pipeline, which is disclosed by any one of claims 1 to 5, is preferably adopted for scribing, and the scribing method is characterized by comprising the following steps:
step 4, drawing a transverse center line by using a disc ruler segmentation method according to the longitudinal center line;
in the step 1, when the reference base 11 is provided with the threaded through holes which are transversely arranged, the supporting legs 2 are adjusted to proper positions through sliding tooth grooves, and the supporting legs 2 and the reference support 1 are fixedly connected into a whole in a bolt and nut fastening mode; when the reference base 11 is provided with the leg gear 111 and the control gear 112, the leg 2 is adjusted to a proper position by rotating the control handle.
In the step 2, when the diameter of the long cylinder pipe is phi 400-phi 4000mm, the height of the telescopic rod of the base handle 12 is adjusted according to the distance between the supporting legs 2 at the two sides, the ratio of the height of the base handle 12 to the diameter of the long cylinder pipe to be scribed is 1/10-1/40 after adjustment, and the scribing precision can be guaranteed to be 0-0.5 mm.
More preferably, after the indicating bubble of the level 3 is in the right position, 2 supporting legs 2 on two sides are stretched in parallel along the telescopic rod, so that the equipment is stably placed on the pipeline with the scribing long cylinder, and the problems of equipment shaking, difficult scribing and the like caused by holding the equipment with one hand during scribing are avoided.
The step 3 comprises the following substeps:
step 3-1: marking 2 marking lines along the contact positions of the supporting legs at the two sides and the cylinder pipeline;
step 3-2: drawing the middle points of 2 marking lines, and marking the marking points at the middle points;
step 3-3: and drawing a vertical line downwards at the marking point to draw one of the four central lines.
In a preferred embodiment, a marking needle is used to mark a marking line along the contact position of the two side legs and the barrel pipeline, then a disc ruler is used to mark the middle point of 2 marking lines, and a foreign punch is used to punch a marking point at the middle point.
And (5) repeating the steps 1 to 5, and drawing a transverse center line and a longitudinal center line at the other end of the long cylinder pipeline.
Through the marking method, the transverse central line and the longitudinal central line of the two sides of the barrel pipeline can be coincident, smooth assembly with other workpieces is facilitated, labor force is reduced, the whole arrangement design is exquisite, the use is convenient, the efficiency is high, and the universality is high.
The present invention has been described above in connection with preferred embodiments, but these embodiments are merely exemplary and merely illustrative. On the basis of the above, the invention can be subjected to various substitutions and modifications, and the substitutions and the modifications are all within the protection scope of the invention.
Claims (10)
1. A four-center line marking device for a long cylinder pipeline is characterized in that,
the marking device comprises a reference support (1), supporting legs (2) and a level gauge (3);
the datum support (1) comprises a datum base (11) and a base handle (12);
the level gauge (3) is arranged at the top of the base handle (12), the supporting legs (2) are connected with the reference base (11), and the supporting legs (2) are symmetrically arranged on two sides of the reference base (11);
the base handle (12) is a telescopic rod with damping, and the level (3) is positioned at different heights by vertically stretching the telescopic rod;
landing leg (2) set up to 4, and every side is provided with 2, and is provided with the telescopic link between 2 landing legs (2) of every side, can carry out parallel stretching.
2. The rectangular cylinder pipeline four-centerline marking device according to claim 1, wherein the base handle (12) is provided with a groove (121) at the top, and the reference base (11) is provided with sliding tooth grooves at two ends;
the gradienter (3) is placed in a groove (121), and the groove (121) is provided with a dimension of 45-90 degrees.
3. The elongated cylindrical pipe four-centerline marking device of claim 2,
the width of the supporting leg (2) is the same as the inner diameter of the sliding tooth groove.
4. The rectangular cylinder pipe four-centerline marking device according to claim 3,
a threaded through hole is formed in the sliding tooth groove of the reference base (11);
the supporting leg (2) is provided with a threaded through hole with the same size as the hole formed in the sliding tooth groove, and the supporting leg (2) and the reference support (1) are fixedly connected into a whole through bolts and nuts.
5. The elongated cylindrical pipe four-centerline marking device of claim 4,
two rows of transversely arranged thread through holes are arranged on the sliding tooth groove, and each row is uniformly provided with 4 thread through holes.
6. The elongated cylindrical pipe four-centerline marking device of claim 1,
a supporting leg gear (111) and a control gear (112) are arranged in the reference base (11), and internal threads are arranged on the inner side of the supporting leg gear (111);
an external thread is arranged on one side of the supporting leg (2), and an internal thread of the supporting leg gear (111) is nested on the outer side of the external thread of the supporting leg (2).
7. The elongated cylindrical pipe four-centerline marking device of claim 6,
the control gear (112) and the leg gear (111) are meshed with each other through a convex-concave structure of the gears;
a control handle is arranged on one side of the control gear (112), and the support leg gear (111) horizontally moves by rotating the handle;
the control handle can drive the control gear (112) to slide longitudinally.
8. A scribing method of a four-centerline scribing device for a long cylinder pipeline, which is used for scribing by the four-centerline scribing device for the long cylinder pipeline according to any one of claims 1 to 7, and is characterized by comprising the following steps:
step 1, adjusting the position of a supporting leg (2) according to the diameter of a cylinder pipeline;
step 2, placing the reference support (1) at one end of the long cylinder pipeline, attaching the support legs to the cylinder pipeline, and adjusting the position to enable the indicating bubble of the level meter (3) to be in the center position;
step 3, marking out a longitudinal center line;
step 4, drawing a transverse center line by using a disc ruler segmentation method according to the longitudinal center line;
9. the scribing method according to claim 8,
the step 3 comprises the following substeps:
step 3-1: marking 2 marking lines along the contact positions of the supporting legs at the two sides and the cylinder pipeline;
step 3-2: drawing the middle points of 2 marking lines, and marking the marking points at the middle points;
step 3-3: and drawing a vertical line downwards at the marking point to draw one of the four central lines.
10. The scribing method according to claim 8, wherein the steps 1 to 4 are repeated to scribe a transverse center line and a longitudinal center line at the other end of the long cylinder pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011334433.2A CN112536785B (en) | 2020-11-24 | 2020-11-24 | Four-center-line marking device and method for long-barrel pipeline |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011334433.2A CN112536785B (en) | 2020-11-24 | 2020-11-24 | Four-center-line marking device and method for long-barrel pipeline |
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| Publication Number | Publication Date |
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| CN112536785A CN112536785A (en) | 2021-03-23 |
| CN112536785B true CN112536785B (en) | 2022-05-20 |
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Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ATE520545T1 (en) * | 2003-03-07 | 2011-09-15 | Swanson Tool Hong Kong Ltd | MEASURING AND MARKING TOOL FOR CRAFTSMEN |
| CN101811299B (en) * | 2010-05-13 | 2012-01-25 | 太原轨道交通装备有限责任公司 | Centre line marking device |
| CN204221779U (en) * | 2014-11-05 | 2015-03-25 | 上海电气核电设备有限公司 | A kind of positioning and marking device for trepanning |
| CN204712035U (en) * | 2015-06-25 | 2015-10-21 | 山西阳煤化工机械（集团）有限公司 | Cylindrical shell chalker |
| CN106181952B (en) * | 2016-08-31 | 2019-05-17 | 山东豪迈机械制造有限公司 | General device for cylinder scribing |
| CN206242033U (en) * | 2016-12-16 | 2017-06-13 | 中国神华能源股份有限公司 | For planing for pipeline line |
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2020
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