CN113216381B - Simplified net rack bolt-ball connection node and construction method thereof - Google Patents
Simplified net rack bolt-ball connection node and construction method thereof Download PDFInfo
- Publication number
- CN113216381B CN113216381B CN202110331924.XA CN202110331924A CN113216381B CN 113216381 B CN113216381 B CN 113216381B CN 202110331924 A CN202110331924 A CN 202110331924A CN 113216381 B CN113216381 B CN 113216381B
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- ball
- net rack
- conical head
- hexagonal sleeve
- ear
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- 238000010276 construction Methods 0.000 title claims abstract description 11
- 238000007789 sealing Methods 0.000 claims description 14
- 238000003466 welding Methods 0.000 claims description 4
- 230000008878 coupling Effects 0.000 claims 2
- 238000010168 coupling process Methods 0.000 claims 2
- 238000005859 coupling reaction Methods 0.000 claims 2
- 210000005069 ears Anatomy 0.000 claims 1
- 238000009434 installation Methods 0.000 abstract description 9
- CAWXEEYDBZRFPE-UHFFFAOYSA-N Hexazinone Chemical compound O=C1N(C)C(N(C)C)=NC(=O)N1C1CCCCC1 CAWXEEYDBZRFPE-UHFFFAOYSA-N 0.000 description 3
- 238000003754 machining Methods 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/18—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
- E04B1/19—Three-dimensional framework structures
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/18—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
- E04B1/19—Three-dimensional framework structures
- E04B1/1903—Connecting nodes specially adapted therefor
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/18—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
- E04B1/19—Three-dimensional framework structures
- E04B1/1903—Connecting nodes specially adapted therefor
- E04B1/1906—Connecting nodes specially adapted therefor with central spherical, semispherical or polyhedral connecting element
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/18—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
- E04B1/24—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons the supporting parts consisting of metal
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/18—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
- E04B1/24—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons the supporting parts consisting of metal
- E04B1/2403—Connection details of the elongated load-supporting parts
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/38—Connections for building structures in general
- E04B1/58—Connections for building structures in general of bar-shaped building elements
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/18—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
- E04B1/19—Three-dimensional framework structures
- E04B2001/1924—Struts specially adapted therefor
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/18—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
- E04B1/19—Three-dimensional framework structures
- E04B2001/1957—Details of connections between nodes and struts
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/18—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
- E04B1/24—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons the supporting parts consisting of metal
- E04B1/2403—Connection details of the elongated load-supporting parts
- E04B2001/2406—Connection nodes
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/18—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
- E04B1/24—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons the supporting parts consisting of metal
- E04B2001/2466—Details of the elongated load-supporting parts
Abstract
The invention discloses a simplified net rack bolt-ball connecting node and a construction method thereof, aiming at the problem that when a traditional net rack ball is connected by a high-strength bolt and a pin, the pin is easy to pop out of a hexagonal sleeve when being installed, the net rack ball connecting node comprises a net rack ball and a rod piece arranged on the net rack ball, the net rack ball and the rod piece are connected by a connecting component, the connecting component comprises a hexagonal sleeve, a conical head and a screw rod, the conical head is connected with the rod piece, the hexagonal sleeve is arranged between the conical head and the net rack ball, a thread matched with the screw rod is arranged in the hexagonal sleeve, and the screw rod penetrates through the conical head and is respectively connected with the hexagonal sleeve and the net rack ball by bolts; the one end that the screw rod is located the conical head is equipped with rotatory ear and detains, be equipped with the otic placode in the conical head, rotatory ear detains the butt and is used for restricting the screw rod to rotate on the otic placode. This application has simplified the connection structure of rack ball, and the installation is more convenient, stability is good, efficiency is higher.
Description
Technical Field
The invention relates to the technical field of steel structures, in particular to a simplified grid bolt-ball connection node and a construction method thereof.
Background
At present, with the continuous application and development of space structures, the grid structure becomes a representative roofing structure form indispensable to the present society due to reasonable stress and stable structure.
The existing grid structure connecting node generally comprises a grid ball, a hexagonal sleeve, a rod piece, a high-strength bolt and a pin, wherein the high-strength bolt sequentially penetrates through the rod piece and the hexagonal sleeve and is in threaded connection with the grid ball, the pin penetrates through the side wall of the hexagonal sleeve and is inserted into the high-strength bolt, the high-strength bolt and the hexagonal sleeve are locked, during installation, the rod piece and the hexagonal sleeve are firstly connected through the high-strength bolt, the high-strength bolt and the hexagonal sleeve are locked through the pin, and then the high-strength bolt and the grid ball are in threaded connection through rotating the hexagonal sleeve. According to the installation mode, when the hexagonal sleeve is rotated, the pin is easily popped out of the hexagonal sleeve, so that the high-strength bolt and the hexagonal sleeve are unlocked, the high-strength bolt cannot be continuously connected with the net rack ball, the pin needs to be driven into the high-strength bolt again, and the operation is inconvenient.
Disclosure of Invention
The invention provides a simplified net rack bolt-ball connecting node and a construction method thereof, which simplify the connecting structure of net rack balls, and have the advantages of more convenient installation, good stability and higher efficiency.
The technical problem to be solved is that: traditional rack ball adopts high strength bolt and pin connection, and the pin easily pops out the telescopic problem of hexagonal when the installation.
In order to solve the technical problems, the invention adopts the following technical scheme:
a simplified net rack bolt ball connection node comprises a net rack ball and a rod piece mounted on the net rack ball, wherein the net rack ball and the rod piece are connected through a connection assembly, the connection assembly comprises a hexagonal sleeve, a conical head and a screw rod, the conical head is connected with the rod piece, the hexagonal sleeve is arranged between the conical head and the net rack ball, threads matched with the screw rod are arranged in the hexagonal sleeve, and the screw rod penetrates through the conical head to be respectively in bolt connection with the hexagonal sleeve and the net rack ball; the one end that the screw rod is located the conical head is equipped with rotatory ear and detains, be equipped with the otic placode in the conical head, rotatory ear detains the butt and is used for restricting the screw rod to rotate on the otic placode.
The invention relates to a simplified net rack bolt ball connection node, which is characterized in that the rotary lug buckle comprises a rotary ring and a rotary lug fixedly arranged on the periphery of the rotary ring, the rotary ring is in threaded connection with a screw rod, and the rotary lug is abutted against an ear plate.
The invention relates to a simplified net rack bolt ball connecting node, which is characterized in that the rotary lug buckle comprises a rotary lug, the rotary lug is fixedly arranged on a screw rod, and the rotary lug is abutted against an ear plate.
The invention relates to a simplified net rack bolt ball connecting node.
The invention relates to a simplified net rack bolt-ball connecting node, which is characterized in that a conical head comprises a cone and a sealing plate fixedly arranged at the small end head end of the cone, and an ear plate is fixedly arranged on the sealing plate.
According to the simplified net rack bolt-ball connecting node, the rod piece is welded with the conical head.
The invention discloses a simplified construction method of a net rack bolt-ball connection node, which comprises the following steps: firstly, welding the ear plate and the sealing plate, inserting the ear plate into the cone, and welding and fixing the sealing plate and the cone; the screw rod is inserted into the cone, the rotating lug is abutted against the lug plate, the hexagonal sleeve is rotated, the screw rod extends out of the hexagonal sleeve, and then the cone and the rod piece are welded and fixed; the hexagonal sleeve is fixed by a tool, and the net rack ball is rotated to enable the screw rod to be inserted into the net rack ball and connected with the net rack ball.
Compared with the prior art, the invention has the following beneficial effects:
1. according to the method, high-strength bolts and pins at the connecting nodes of the traditional net rack ball are eliminated and replaced by equal-strength screw rods, threads are arranged in the hexagonal sleeve, and the rotation of the screw rods is limited by matching with the rotary lug buckles and the lug plates which are positioned in the conical heads, so that when the hexagonal sleeve is rotated, the screw rods can only move along the axis of the hexagonal sleeve, and the screw rods are connected with the net rack ball; compared with the traditional connection mode, the connection structure of the net rack ball is simplified, the installation is more convenient, and the efficiency is higher;
2. by arranging the conical heads, the space between the rod pieces can be increased, and the phenomenon that when a plurality of rod pieces are installed on the net rack ball, the adjacent rod pieces are interfered with each other to influence the installation of the rod pieces is avoided;
3. this application is put the mill machine-shaping with being connected between member, conical head, hexagonal sleeve and the screw rod, and machining efficiency is high, of high quality, transport to the scene directly be connected with the rack ball can, convenient operation compares in traditional mounting means, and the efficiency of construction is higher.
The invention will be further explained with reference to the drawings.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a schematic structural view of a protruding connection assembly.
Reference numerals:
1. a net rack ball; 2. a rod member; 3. a connecting assembly; 31. a hexagonal sleeve; 32. a conical head; 321. a cone; 322. closing the plate; 33. a screw; 4. rotating the ear clip; 41. a rotating ring; 42. rotating the lug; 5. an ear plate.
Detailed Description
As shown in fig. 1, the present invention provides a simplified net rack bolt-ball connection node and a construction method thereof. The net rack ball connecting node comprises a net rack ball 1 and a rod piece 2 installed on the net rack ball 1, and the rod piece 2 can be provided with a plurality of rods, so that different working condition requirements are met. The net rack ball 1 and the rod piece 2 are connected through the connecting component 3, the connecting component 3 comprises a hexagonal sleeve 31, a conical head 32 and a screw 33, the hexagonal sleeve 31 is selected to be convenient to be matched with a tool to rotate, and the installation convenience is improved; be equipped with in the hexagonal sleeve 31 with screw 33 screw-thread fit's screw thread, offer on the net rack ball 1 with screw 33 complex screw hole, screw 33 passes conical head 32 and hexagonal sleeve 31 and with net rack ball 1 threaded connection, screw 33 and hexagonal sleeve 31 screw-thread fit simultaneously. The one end that screw rod 33 is located conical head 32 is equipped with rotatory ear knot 4, and conical head 32 internal stability is equipped with otic placode 55, and when rotating hexagonal sleeve 31, rotatory ear knot 4 butt is on otic placode 5 for the rotation of restriction screw rod 33, thereby makes screw rod 33 carry out axial displacement along hexagonal sleeve 31, realizes rotating hexagonal sleeve 31, fixes screw rod 33 in screw in rack ball 1.
With reference to fig. 1 and fig. 2, the rotary ear clip 4 has two structural forms, i.e., the rotary ear clip 4 includes a rotary ring 41 and a rotary ear 42 fixedly disposed on the periphery of the rotary ring 41, and the rotary ear 42 may be welded to the rotary ring 41 or integrally formed with the rotary ring 41; the rotating ring 41 is internally provided with an internal thread which is matched with the screw 33, the direction of the internal thread is the same as that of the hexagonal sleeve 31, the rotating ring 41 is sleeved on the screw 33 in a threaded manner, and when the hexagonal sleeve 31 is rotated, the rotating lug 42 is abutted on the lug plate 5 to limit the rotation of the screw 33.
In the second form, the rotary lug 4 includes a rotary lug 42, the rotary lug 42 is fixed on the screw 33, and when the hexagonal socket 31 is rotated, the rotary lug 42 abuts against the lug plate 5 to limit the rotation of the screw 33.
The two lug plates 5 are symmetrically arranged about the axis of the conical head 32, the two rotating lugs 42 are also arranged, and the two rotating lugs 42 are respectively positioned on the same side of the lug plates 5, so that the rotation of the screw 33 in two directions is limited, and the screw 33 is ensured to move along the axis of the hexagonal sleeve 31 when the hexagonal sleeve 31 is rotated.
The cone head 32 comprises a hollow cone 321 and a sealing plate 322 welded at one end of the small end of the cone 321, and the large end of the cone 321 is welded and fixed with the rod 2; the ear plate 5 is welded on the sealing plate 322, during processing, the ear plate 5 is firstly welded on the sealing plate 322, and then the ear plate 5 is inserted into the cone 321, so that the sealing plate 322 and the cone 321 are welded and fixed, and the processing is convenient; and can increase the interval between the member 2 through setting up conical head 32, when avoiding installing a plurality of members 2 on the rack ball 1, mutual interference between the adjacent member 2 influences the installation of member 2.
This application cancels traditional net rack ball 1 high strength bolt and pin, replaces with screw rod 33 of equidensity, sets up the screw thread in hexagonal sleeve 31 to the cooperation is located rotatory ear 42 knot 4 in conical head 32 and the rotation of otic placode 5 cooperation restriction screw rod 33, thereby when rotating hexagonal sleeve 31, screw rod 33 can only move along hexagonal sleeve 31's axis, makes screw rod 33 be connected with net rack ball 1. Compare in traditional connected mode, simplified the connection structure of rack ball 1, it is more convenient to install, and efficiency is higher.
A simplified net rack bolt-ball connection node and a construction method thereof comprise the following steps:
s1, processing the conical head 32: the ear plate 5 is welded to the sealing plate 322, and the ear plate 5 is inserted into the cone 321, so that the sealing plate 322 is welded to the cone 321.
S2, connecting rod piece 2: the screw 33 is inserted into the cone 321, the rotary lug 42 is abutted against the lug plate 5, the hexagonal sleeve 31 is rotated to extend the screw 33 out of the hexagonal sleeve 31, and then the cone 321 and the rod 2 are welded and fixed.
S3, connecting the net rack ball 1: the hexagonal sleeve 31 is fixed by a tool, the rotation of the screw 33 is limited under the action of the hexagonal sleeve 31, the rotary fastener and the ear plate 5, and then the net rack ball 1 is rotated, so that the screw 33 is inserted into the net rack ball 1 and connected with the net rack ball 1. This application is put the mill machine-shaping with being connected between member 2, conical head 32, hexagonal sleeve 31 and the screw rod 33, and machining efficiency is high, of high quality, transport to the scene directly be connected with rack ball 1 can, convenient operation compares in traditional mounting means, and the efficiency of construction is higher.
The above-mentioned embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solution of the present invention by those skilled in the art should fall within the protection scope defined by the claims of the present invention without departing from the spirit of the present invention.
Claims (8)
1. The utility model provides a net rack bolted ball connected node of simplification which characterized in that: including rack ball (1) and install member (2) on rack ball (1), rack ball (1) and member (2) are connected through coupling assembling (3), coupling assembling (3) include hexagonal sleeve (31), conical head (32) and screw rod (33), conical head (32) are connected with member (2), hexagonal sleeve (31) set up between conical head (32) and rack ball (1), be equipped with in hexagonal sleeve (31) with screw rod (33) complex screw thread, screw rod (33) pass conical head (32) respectively with hexagonal sleeve (31) and rack ball (1) bolted connection; the one end that screw rod (33) are located conical head (32) is equipped with rotatory ear and detains (4), be equipped with otic placode (5) in conical head (32), rotatory ear is detained (4) and is included rotatory ear (42), rotatory ear (42) butt of rotatory ear detaining (4) is used for restricting screw rod (33) to rotate on otic placode (5).
2. A simplified grid bolted-ball joint according to claim 1 wherein: the rotary ear clip (4) comprises a rotary ring (41), and the rotary ear (42) is fixedly arranged on the periphery of the rotary ring (41).
3. A simplified grid bolted-ball joint according to claim 1 wherein: the rotary lug (42) is fixedly arranged on the screw rod (33).
4. A simplified grid bolted-ball joint according to any one of claims 2 to 3 wherein: the ear plates (5) are symmetrically arranged two, and the rotating ears (42) are arranged two and are matched with the ear plates (5) for use.
5. A simplified rack bolted-ball connection node as defined in claim 1 wherein: the conical head (32) comprises a cone (321) and a sealing plate (322) fixedly arranged at the small end head end of the cone (321), and the ear plate (5) is fixedly arranged on the sealing plate (322).
6. A simplified rack bolted-ball connection node as defined in claim 1 wherein: the rod piece (2) is welded with the conical head (32).
7. A simplified grid bolted-ball joint according to claim 1 wherein: a plurality of rod pieces (2) are arranged on the net rack ball (1).
8. The simplified construction method of a net rack bolt-ball connection node according to claim 5, characterized by comprising the following steps: firstly, welding the ear plate (5) and the sealing plate (322), inserting the ear plate (5) into the cone (321), and welding and fixing the sealing plate (322) and the cone (321); the screw (33) is inserted into the cone (321), the rotary lug (42) is abutted against the lug plate (5), the hexagonal sleeve (31) is rotated, the screw (33) extends out of the hexagonal sleeve (31), and then the cone (321) and the rod piece (2) are welded and fixed; a hexagonal sleeve (31) is fixed by a tool, and the net rack ball (1) is rotated, so that a screw (33) is inserted into the net rack ball (1) and connected with the net rack ball (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110331924.XA CN113216381B (en) | 2021-03-29 | 2021-03-29 | Simplified net rack bolt-ball connection node and construction method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110331924.XA CN113216381B (en) | 2021-03-29 | 2021-03-29 | Simplified net rack bolt-ball connection node and construction method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113216381A CN113216381A (en) | 2021-08-06 |
| CN113216381B true CN113216381B (en) | 2022-08-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110331924.XA Expired - Fee Related CN113216381B (en) | 2021-03-29 | 2021-03-29 | Simplified net rack bolt-ball connection node and construction method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113216381B (en) |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4863303A (en) * | 1984-12-04 | 1989-09-05 | Inryco, Inc. | Structural joint members for space frame system |
| EP0228930A1 (en) * | 1985-11-19 | 1987-07-15 | Gérard Chamayou | Device for assembling tubes or rods |
| GB9305924D0 (en) * | 1993-03-22 | 1993-05-12 | Naxco Ind S Pte Ltd | Spaceframe structures |
| CN2389939Y (en) * | 1999-07-22 | 2000-08-02 | 樊志 | Sleeveless high-strength bolt connecting device for grid structure |
| EP3098463B1 (en) * | 2015-05-26 | 2018-03-14 | Airbus Operations GmbH | Rotary joint, framework construction kit and method for manufacturing a rotary joint |
| CN105544737A (en) * | 2015-12-18 | 2016-05-04 | 孝感华越机电科技有限公司 | Bolt ball net rack node |
| CN205935203U (en) * | 2016-08-29 | 2017-02-08 | 江西力宏钢结构实业有限公司 | Steel structural net frame |
| CN111287318A (en) * | 2020-03-27 | 2020-06-16 | 山东建筑大学 | Spatial grid structure stud bolt connection node and construction method thereof |
| CN212613009U (en) * | 2020-06-12 | 2021-02-26 | 山东华亿钢机股份有限公司 | Novel net rack rod piece |
-
2021
- 2021-03-29 CN CN202110331924.XA patent/CN113216381B/en not_active Expired - Fee Related
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| CN113216381A (en) | 2021-08-06 |
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