CN111112903B - Portable steel wire mesh framework pipe sealing device - Google Patents
Portable steel wire mesh framework pipe sealing device Download PDFInfo
- Publication number
- CN111112903B CN111112903B CN202010028771.7A CN202010028771A CN111112903B CN 111112903 B CN111112903 B CN 111112903B CN 202010028771 A CN202010028771 A CN 202010028771A CN 111112903 B CN111112903 B CN 111112903B
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- steel wire
- wire mesh
- welding
- limiting device
- mesh framework
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
- B23K37/02—Carriages for supporting the welding or cutting element
- B23K37/0252—Steering means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2103/00—Materials to be soldered, welded or cut
- B23K2103/30—Organic material
- B23K2103/42—Plastics
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- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Wire Processing (AREA)
Abstract
The invention relates to a portable steel wire mesh framework pipe sealing device which comprises an extrusion welding mechanism and a fixed support mechanism, wherein the extrusion welding mechanism is connected with the fixed support mechanism through a pipeline; the fixed support mechanism comprises a screw rod, an inner support assembly and a conical welding limiting device; the inner support component is in threaded connection with the screw; the conical welding limiting device penetrates through the screw rod, and the position of the conical welding limiting device on the screw rod can be changed; the conical welding limiting device is used for limiting the position of the end opening of the steel wire mesh framework pipe, and a welding seam is formed between the conical welding limiting device and the end opening. The edge sealing device has the advantages of simple structure, convenience in carrying and use and wide application range, can be used for performing edge sealing treatment on the cut steel wire mesh framework pipes, obviously improves the edge sealing treatment efficiency and effect, can adapt to the steel wire mesh framework pipes with different diameters, and effectively prevents fluid and dust from entering between the steel wire mesh frameworks.
Description
Technical Field
The invention belongs to the technical field of pipe port edge sealing, and particularly relates to a portable steel wire mesh framework pipe sealing device.
Background
The steel wire mesh framework pipe is an industry name of steel wire mesh framework plastic composite pipe, and is an improved novel steel wire mesh framework plastic composite pipe. The pipe is made up by using high-strength steel wires after plastic coating and cross-weaving to form net as skeleton and thermoplastic plastics polyethylene and fusing them, using steel wire winding net as skeleton reinforcement body of polyethylene plastic pipe, using high-density polyethylene (HDPE) as core pipe base body, adopting high-performance HDPE modified adhesive resin to tightly connect the steel wire skeleton with inner and outer layers of high-density polyethylene together so as to make it have excellent composite effect. The composite pipe overcomes the disadvantages of both steel and plastic pipes, while maintaining the advantages of both steel and plastic pipes, because the high strength steel wire reinforcement is wrapped in a continuous thermoplastic.
As shown in fig. 1, the steel wire mesh framework pipe is a complete pipe when leaving a factory, but needs to be cut according to actual conditions during construction in a construction site, and because the steel wire mesh framework is arranged inside the steel wire mesh framework pipe, the cut part needs to be subjected to edge sealing after cutting, the edge sealing treatment is mainly carried out on the steel wire mesh framework and the connection part between the steel wire mesh framework and inner and outer layers of high-density polyethylene, so that fluid and dust are prevented from entering between the steel wire mesh frameworks, and the edge sealing tool is not available on the site, can only be simply and manually treated, and has the defects of inconvenience, practicality, poor treatment effect and the like.
Disclosure of Invention
The invention provides a portable steel wire mesh framework pipe sealing device aiming at the technical problems in the prior art, and solves the problems that because no tool for sealing edges of steel wire mesh framework pipes is arranged in a construction site, only manual edge sealing treatment can be carried out, and the portable steel wire mesh framework pipe sealing device is inconvenient and practical and has poor treatment effect.
The technical scheme for solving the technical problems is as follows:
a portable steel wire mesh framework pipe sealing device comprises an extrusion welding mechanism and a fixed support mechanism; the fixed support mechanism comprises a screw, an inner support assembly and a conical welding limiting device; the inner support assembly is in threaded connection with the screw; the conical welding limiting device penetrates through the screw rod, and the position of the conical welding limiting device on the screw rod can be changed; the conical welding limiting device is used for limiting the position of the conical welding limiting device to the port of the steel wire mesh framework pipe, and a welding seam is formed between the conical welding limiting device and the port.
On the basis of the technical scheme, the invention can be further improved as follows.
Further, the conical welding limiting device is in threaded connection with the screw rod.
Further, the conical welding limiting device is connected with the screw rod in a sliding mode; and the screw rod is provided with a nut for fixing the conical welding limiting device.
Further, the inner support assembly comprises a rolling bearing seat, at least two first support rods uniformly distributed along the circumferential direction of the rolling bearing seat, a limit bolt and second support rods uniformly distributed along the circumferential direction of the limit bolt; the inner ring of the rolling bearing seat is fixedly connected with the screw, and the limiting bolt is in threaded connection with the screw; one end of the first supporting rod is hinged with the rolling bearing seat, and the other end of the first supporting rod is hinged with the second supporting rod; the other end of the second support rod is hinged with the limiting bolt, and the number of the second support rods is the same as that of the first support rods; the first supporting rod and the second supporting rod are used for supporting the inner wall of the steel wire mesh framework pipe.
Furthermore, the number of the first supporting rods and the number of the second supporting rods are two; the axes of the two first supporting rods, the two second supporting rods and the screw rod are all in the same plane.
Furthermore, the end part of at least one first supporting rod far away from the screw rod is sleeved with an anti-skid rubber pad.
Further, the fixed bracket mechanism further comprises a first hinge used for connecting the first support rod and the rolling bearing seat, a second hinge used for connecting the second support rod and the limiting bolt, and a third hinge used for connecting the first support rod and the second support rod.
Further, the fixed support mechanism further comprises a handle, and the handle is fixedly connected with one end, close to the conical welding limiting device, of the screw rod.
Further, the extrusion welding mechanism comprises an extrusion welding gun; and welding the plastic welding flux extruded by the extrusion welding gun to the welding line to realize rapid edge sealing.
Further, the screw, the first support rod and the second support rod are all made of stainless steel materials; the conical welding limiting device is made of aluminum alloy.
The invention has the beneficial effects that: the sealing device is simple in structure, convenient to carry and use and wide in application range, is particularly suitable for the situation of construction in a construction site, can be used for performing edge sealing treatment on the cut steel wire mesh framework pipes, remarkably improves the edge sealing treatment efficiency and effect, can be suitable for the steel wire mesh framework pipes with different diameters, and effectively prevents fluid and dust from entering between the steel wire mesh frameworks.
Drawings
FIG. 1 is a schematic structural view of a steel wire mesh skeleton pipe according to the present invention;
FIG. 2 is a schematic view of the closure of the present invention in use;
FIG. 3 is a schematic structural view of the fixed bracket mechanism of the present invention;
fig. 4 is a schematic structural diagram of the fixing bracket mechanism of the present invention.
In the drawings, the components represented by the respective reference numerals are listed below:
10. the steel wire mesh framework pipe comprises a steel wire mesh framework pipe body 11, a plastic inner layer 12, a steel wire mesh framework layer 13, a plastic outer layer 20, a fixed support mechanism 21, a screw rod 218, a connecting rod 22, a rolling bearing seat 223, a first hinge 23, a first supporting rod 24, a limiting bolt 245, a second hinge 25, a second supporting rod 26, a third hinge 27, a conical welding limiting device 28, a handle 30 and a welding line.
Detailed Description
The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the invention.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," and "connected" are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. To those of ordinary skill in the art, the specific meanings of the above terms in the present invention are understood according to specific situations.
As shown in fig. 1, a steel wire mesh framework pipe 10 needs to be cut according to actual conditions during construction of a construction site, the steel wire mesh framework pipe 10 comprises a plastic inner layer 11, a steel wire mesh framework layer 12 and a plastic outer layer 13 which are sequentially distributed from inside to outside, and due to the existence of the steel wire mesh framework layer 12, the cut part, namely a port of the steel wire mesh framework pipe 10 needs to be subjected to edge sealing after cutting, and edge sealing is mainly performed on the steel wire mesh framework layer 12 and a connection part between the steel wire mesh framework layer 12 and the plastic inner layer 11 and between the steel wire mesh framework layer 13 so as to prevent fluid and dust from entering between steel wire mesh frames.
As shown in fig. 2 to fig. 4, the portable steel wire mesh framework tube sealing device provided in this embodiment includes a fixed support mechanism 20 and an extrusion welding mechanism; the fixed support mechanism 20 comprises a screw 21, a rolling bearing seat 22, at least two first support rods 23 uniformly distributed along the circumferential direction of the rolling bearing seat 22, a limit bolt 24, second support rods 25 uniformly distributed along the circumferential direction of the limit bolt 24 and a conical welding limit device 27;
the inner ring of the rolling bearing seat 22 is fixedly connected with the screw rod 21, and the limit bolt 24 is in threaded connection with the screw rod 21; one end of the first supporting rod 23 is hinged with the rolling bearing seat 22, and the other end of the first supporting rod is hinged with the second supporting rod 25; the other end of the second support rod 25 is hinged to the limit bolt 24, the number of the second support rods 25 is the same as that of the first support rods 23, that is, when the screw 21 rotates, the inner ring of the rolling bearing seat 22 rotates together with the screw 21, and the outer ring of the rolling bearing seat 22 remains stationary, so that the axial position of the rolling bearing seat 22 relative to the screw 21 is unchanged, and because the limit bolt 24 is in threaded connection with the screw 21, and the first support rod 23 and the second support rod 25 are always in the same plane, the limit bolt 24 can move leftwards or rightwards along the axial direction of the screw 21 according to the rotation direction of the screw 21, so as to change the distance between the limit bolt 24 and the rolling bearing seat 22 and the included angle between the first support rod 23 and the second support rod 25, so that the first support rod 23 and the second support rod 25 can meet the fixation of the steel wire mesh skeleton pipes 10 with different diameters, so that the fixed support mechanism 20 and the sealing device are suitable for the steel wire mesh framework pipes 10 with different diameters;
the conical welding limiting device 27 penetrates through the screw rod 21, and the position of the conical welding limiting device on the screw rod 21 can be changed; the conical welding limiting device 27 is used for limiting the position of the end of the steel wire mesh framework pipe 10, and a welding seam 30 is formed between the conical welding limiting device 27 and the end, namely, the end with the smaller diameter of the conical welding limiting device 27 extends into the steel wire mesh framework pipe 10 and is limited to the end of the steel wire mesh framework pipe 10, so that the welding seam 30 is conveniently formed, meanwhile, the conical structure of the conical welding limiting device 27 enables the conical welding limiting device to be suitable for the steel wire mesh framework pipes 10 with different diameters, and the practicability and the application range of the fixed support mechanism 20 and the sealing device are remarkably improved;
the extrusion welding mechanism is used for hot melting and extruding the plastic welding flux and welding the plastic welding flux to the welding line 30;
the first support rod 23 and the second support rod 25 are supported on the inner wall of the steel wire mesh framework pipe 10 by rotating the screw rod 21, then the position of the conical welding limiting device 27 on the screw rod 21 is changed, the conical welding limiting device 27 is limited to the port of the steel wire mesh framework pipe 10, a welding seam 30 is formed, and finally the plastic welding flux is extruded by hot melting of the extrusion welding mechanism and welded to the welding seam 30, so that rapid edge sealing is realized, and fluid and dust are effectively prevented from entering between steel wire mesh frameworks.
As shown in fig. 2, in this embodiment, the tapered welding limiting device 27 is in threaded connection with the screw 21, so as to change the position of the tapered welding limiting device 27 on the screw 21, that is, after the first support rod 23 and the second support rod 25 are supported on the inner wall of the steel wire mesh skeleton pipe 10, the tapered welding limiting device 27 is rotated to move toward the port of the steel wire mesh skeleton pipe 10 along the screw 21 until a welding seam 30 is formed, and the tapered welding limiting device 27 is stopped rotating.
In addition, the taper welding limiting device 27 can be connected with the screw rod 21 in a sliding mode, a nut used for fixing the taper welding limiting device 27 is arranged on the screw rod 21, so that the position of the taper welding limiting device 27 on the screw rod 21 can be changed, the taper welding limiting device 27 is fixed through the nut, and the stability of the welding seam 30 is guaranteed.
As shown in fig. 3 and 4, the screw 21 includes a threaded section and a non-threaded section, the threaded section is provided with an external thread 211, and the inner side of the limit bolt 24 is provided with an internal thread matching with the external thread 211 to realize the threaded connection between the limit bolt 24 and the screw 21;
the rolling bearing seat 22 comprises an inner ring, an outer ring, a rolling body and a retainer; the inner ring is used for matching with the non-threaded end of the screw 21 and rotating together with the screw 21; the rolling bodies are uniformly distributed between the inner ring and the outer ring by means of the retainer, and the shape, size and number of the rolling bodies directly influence the service performance and service life of the rolling bearing seat 22; the retainer can enable the rolling bodies to be uniformly distributed and guide the rolling bodies to rotate to play a lubricating role.
Preferably, the number of the first support rod 23 and the second support rod 25 is two, so as to reduce the production difficulty and the cost of the sealing device; the axes of the two first support rods 23, the two second support rods 25 and the screw 21 are all in the same plane, so that the supporting and limiting effects of the fixed bracket mechanism 20 are ensured, and the edge sealing treatment efficiency and effect are improved.
As shown in fig. 3 and 4, the fixed bracket mechanism 20 further includes a first hinge 223 for connecting the first support rod 23 and the rolling bearing seat 22, a second hinge 245 for connecting the second support rod 25 and the limit bolt 22, and a third hinge 26 for connecting the first support rod 23 and the second support rod 25, so that one end of the first support rod 23 is hinged to the rolling bearing seat 22, the other end of the first support rod 23 is hinged to the second support rod 25, and the other end of the second support rod 25 is hinged to the limit bolt 24.
The invention also provides an improved technical scheme, wherein in the improved technical scheme, an anti-skid rubber pad is sleeved on the end part of at least one first supporting rod 23 far away from the screw rod 21; when the rolling bearing seat is used, the anti-skid rubber pads at the lower part in the steel wire mesh framework pipe 10 are in direct contact with the inner wall of the steel wire mesh framework pipe 10, so that the outer ring of the rolling bearing seat 22 and the first support rod 23 are ensured not to rotate along with the rotation of the screw 21.
The invention also provides an improved technical scheme, in the improved technical scheme, the fixed bracket mechanism 20 further comprises a handle 28, and the handle 28 is fixedly connected with one end of the screw rod 21 close to the conical welding limiting device 27, so that the screw rod 21 can be rotated manually, the operation convenience of the fixed bracket mechanism 20 and the sealing device is improved, and the edge sealing treatment efficiency is further improved.
Preferably, the fixed bracket mechanism 20 further comprises a connecting rod 218 for connecting the screw 21 and the handle 28; one end of the connecting rod 218 is fixedly connected with the screw 21, and the other end is fixedly connected with the handle 28.
The extrusion welding mechanism includes an extrusion welding gun to effect hot melt extrusion of the plastic solder and welding to the weld 30. In this embodiment, the plastic inner layer 11 and the plastic outer layer 13 are made of High Density Polyethylene (HDPE), and the plastic solder melted and extruded by the extrusion welding gun is PE solder.
The invention also provides an improved technical scheme, wherein in the improved technical scheme, the screw 21, the first support rod 23 and the second support rod 25 are all made of stainless steel materials, and have the advantages of excellent corrosion resistance, formability, compatibility, toughness and the like; the conical welding limiting device 27 is made of aluminum alloy, and has the advantages of low density, high strength, good plasticity, and excellent electrical conductivity, thermal conductivity and corrosion resistance.
The working process of the sealing device in this embodiment is as follows: when the end of the steel wire mesh framework pipe 10 needs to be edge-sealed, one end of the screw 21 close to the rolling bearing seat 22 is extended into the steel wire mesh framework pipe 10, the end of the first support rod 23 at the inner lower part of the steel wire mesh framework pipe 10 is directly contacted with the inner wall of the steel wire mesh framework pipe 10, so that the outer ring of the rolling bearing seat 22 and the first support rod 23 do not rotate along with the rotation of the screw 21, and then the screw 21 is rotated until the first support rod 23 and the second support rod 25 are supported on the inner wall of the steel wire mesh framework pipe 10; then, rotating the conical welding limiting device 27 to enable the conical welding limiting device to axially move towards the port of the steel wire mesh framework pipe 10 along the screw 21 until the conical welding limiting device is limited to the port of the steel wire mesh framework pipe 10 and a welding seam 30 is formed, and stopping rotating the conical welding limiting device 27; then, welding the plastic welding flux which is hot-melted and extruded by the extrusion welding gun to the welding line 30 to realize quick edge sealing; after the edge sealing process is completed, the screw 21 is rotated in the opposite direction, and then the fixing bracket mechanism 20 is removed.
This embodiment closing device simple structure, carry and convenient to use, application scope are wide, are particularly useful for the condition of building site construction, can enough carry out the banding to the wire net skeleton pipe 10 after cutting and handle, are showing and are improving banding treatment efficiency and effect, can adapt to wire net skeleton pipe 10 of different diameters size again, prevent effectively that fluid and dirt from entering into between the wire net bone.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (8)
1. A portable steel wire mesh framework pipe sealing device comprises an extrusion welding mechanism and is characterized by also comprising a fixed support mechanism (20); the fixed support mechanism (20) comprises a screw rod (21), an inner support assembly and a conical welding limiting device (27); the inner support component is in threaded connection with the screw rod (21); the conical welding limiting device (27) penetrates through the screw rod (21), the conical welding limiting device (27) is in threaded connection with the screw rod (21), and the position of the conical welding limiting device on the screw rod (21) can be changed; the conical welding limiting device (27) is used for limiting the position of the conical welding limiting device to a port of the steel wire mesh framework pipe (10), and a welding seam (30) is formed between the conical welding limiting device and the port; and welding the plastic welding flux extruded by the extrusion welding gun to the welding seam (30) to realize quick edge sealing.
2. The portable steel wire mesh framework pipe sealing device as claimed in claim 1, wherein the conical welding limiting device (27) is connected with the screw rod (21) in a sliding manner; and a nut used for fixing the conical welding limiting device (27) is arranged on the screw rod (21).
3. The portable steel wire mesh framework pipe sealing device as claimed in claim 1, wherein the inner support assembly comprises a rolling bearing seat (22), at least two first support rods (23) uniformly distributed along the circumferential direction of the rolling bearing seat (22), a limit bolt (24), and second support rods (25) uniformly distributed along the circumferential direction of the limit bolt (24); the inner ring of the rolling bearing seat (22) is fixedly connected with the screw rod (21), and the limiting bolt (24) is in threaded connection with the screw rod (21); one end of the first support rod (23) is hinged with the rolling bearing seat (22), and the other end of the first support rod is hinged with the second support rod (25); the other end of the second supporting rod (25) is hinged with the limiting bolt (24), and the number of the second supporting rods (25) is the same as that of the first supporting rods (23); the first support rod (23) and the second support rod (25) are used for supporting the inner wall of the steel wire mesh framework pipe (10).
4. The portable steel wire mesh framework pipe sealing device as claimed in claim 3, wherein the number of the first supporting rod (23) and the second supporting rod (25) is two; the axes of the two first supporting rods (23), the two second supporting rods (25) and the screw (21) are all in the same plane.
5. A portable steel wire mesh skeleton pipe sealing device according to claim 3, wherein the end of at least one first supporting rod (23) far away from the screw rod (21) is sleeved with an anti-skid rubber pad.
6. The portable steel wire mesh framework pipe sealing device as claimed in claim 3, wherein the fixed support mechanism (20) further comprises a first hinge (223) for connecting the first support rod (23) with the rolling bearing seat (22), a second hinge (245) for connecting the second support rod (25) with the limit bolt (24), and a third hinge (26) for connecting the first support rod (23) with the second support rod (25).
7. The portable steel wire mesh framework pipe sealing device as claimed in claim 1, wherein the fixed support mechanism (20) further comprises a handle (28), and the handle (28) is fixedly connected with one end of the screw rod (21) close to the conical welding limiting device (27).
8. The portable steel wire mesh framework pipe sealing device as claimed in claim 3, wherein the screw rod (21), the first support rod (23) and the second support rod (25) are all made of stainless steel; the conical welding limiting device (27) is made of aluminum alloy.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010028771.7A CN111112903B (en) | 2020-01-11 | 2020-01-11 | Portable steel wire mesh framework pipe sealing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010028771.7A CN111112903B (en) | 2020-01-11 | 2020-01-11 | Portable steel wire mesh framework pipe sealing device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111112903A CN111112903A (en) | 2020-05-08 |
| CN111112903B true CN111112903B (en) | 2022-04-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010028771.7A Active CN111112903B (en) | 2020-01-11 | 2020-01-11 | Portable steel wire mesh framework pipe sealing device |
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| CN (1) | CN111112903B (en) |
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| CN112515825A (en) * | 2020-12-16 | 2021-03-19 | 中南大学湘雅二医院 | Hepatobiliary pancreas surgery is with 3D printing exempts from to sew up compatible support of courage intestines |
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| CN204372388U (en) * | 2015-01-12 | 2015-06-03 | 喀什市新秦管业有限责任公司 | A kind of steel wire mesh framework composite tube material Quick Connect Kit |
| CN105598631A (en) * | 2016-03-25 | 2016-05-25 | 上海普睿玛智能科技有限公司 | Rhombic internal support clamp for round pipe welding |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2341745Y (en) * | 1998-03-30 | 1999-10-06 | 林光平 | Device for centring cutter at the same time holding pipe material |
| CN1695845A (en) * | 2005-06-10 | 2005-11-16 | 汪兆钧 | Sealing machine for end face of steel-plastic composite tube |
| CN201306574Y (en) * | 2008-10-28 | 2009-09-09 | 张杰城 | Pipe end port plugging device |
| ES2400295A2 (en) * | 2011-09-23 | 2013-04-08 | Klk Electro Materiales, S.A. | System and process for connecting tubes and cables and method thereof |
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| CN103737220A (en) * | 2014-01-21 | 2014-04-23 | 南京理工大学 | Internal supporting device for friction stir welding of closed barrel with reserved openings at centers of two ends |
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| Publication number | Publication date |
|---|---|
| CN111112903A (en) | 2020-05-08 |
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