CN111299955A - Assembly welding movable welding platform of heating furnace tube and assembly welding installation construction method - Google Patents
Assembly welding movable welding platform of heating furnace tube and assembly welding installation construction method Download PDFInfo
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- CN111299955A CN111299955A CN202010318202.6A CN202010318202A CN111299955A CN 111299955 A CN111299955 A CN 111299955A CN 202010318202 A CN202010318202 A CN 202010318202A CN 111299955 A CN111299955 A CN 111299955A
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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
- B23K37/04—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work
- B23K37/053—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work aligning cylindrical work; Clamping devices therefor
- B23K37/0531—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work aligning cylindrical work; Clamping devices therefor internal pipe alignment clamps
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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
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/04—Tubular or hollow articles
- B23K2101/06—Tubes
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Abstract
The invention relates to an assembly welding movable welding platform of a heating furnace tube and an assembly welding installation construction method. The assembly welding movable welding platform comprises a supporting bracket and an assembly welding bracket, and the assembly welding bracket is connected with the supporting bracket through a rotating supporting shaft; the assembly welding support comprises a supporting beam and arc-shaped beams, wherein the arc-shaped beams in parallel are longitudinally arranged to form an arc-shaped supporting surface, a plurality of carrier rollers for supporting the furnace tube are fixedly connected to the upper surface of each arc-shaped beam, and a rotating supporting shaft is detachably connected with the supporting beam in the middle. When the assembly is welded, the furnace tube and the platform are fixed through the U-shaped hoop. The rotatable assembly welding support is convenient to weld in the welding process, and after the assembly welding is finished, the assembly welding support is lifted by a crane, and the support and the rotating support shaft are detached; after the assembly is hoisted into the heating furnace, the U-shaped hoop for fixing the furnace tube on the assembly welding support is removed, the assembly welding support is hoisted out, the furnace tube is installed, and the purpose of improving the construction progress is achieved.
Description
Technical Field
The invention relates to the technical field of furnace tube welding assembly and installation construction, in particular to an assembly welding mobile welding device for a heating furnace tube in a device for chemical production by taking petroleum and natural gas as raw materials, and an assembly welding and installation construction method adopting the device.
Background
In the device for chemical production by using petroleum and natural gas as raw materials, a heating furnace is key equipment for pyrolysis reaction, a reaction feeding heating furnace and a fractionating tower bottom reboiling furnace both adopt convection radiation type cylindrical furnaces, and the total weight of the two heating furnaces and an attached structure is more than 400 tons. The whole is a steel structure frame, the lower part is a radiation exhaust pipe section, the upper part is a convection exhaust pipe section, and the top is a pipeline connected with a chimney.
Furnace tubes and sharp-bent elbows used in the radiation pipeline system are cast and formed pipeline elements, are relatively fragile and long in length, and need to be assembled and welded on a construction site. The furnace tube assembly consists of 6 furnace tubes with the length of 14m and sharp bends, for example, the nominal diameter DN150mm of the HK40 furnace tubes has the length of 7m, 2 furnace tubes are connected into 14m, the central bending diameter of the 180-degree sharp bend tube is 350mm, the whole furnace tube assembly consists of 6 furnace tubes with the length of 14m and sharp bends, and the width of the assembly is 14.7m and 1.75 m. DN150 has pipe wall thickness delta =12mm, because of the cast pipe, the wall thickness in the circumference of the pipe and the sharp elbow is not uniform, the thick part is delta =12mm, the thin part is only delta =9mm, and the elbow has the same wall thickness error. Before welding, the wall thickness of the periphery of the welding opening is polished, and the wall thickness of the butt joint part of the butt welding pipe and the sharp bend is the same. The grinding and facing processing amount is very large, and the requirement on welding conditions is very strict. In the construction process, because the furnace tube component has heavier weight and high installation position, the furnace tube is prevented from being broken during hoisting.
Disclosure of Invention
The invention aims to provide a movable welding platform for assembling and welding a heating furnace tube, which is used as a welding assembly platform and a hanging bracket.
The invention also aims to provide a method for assembling, welding and installing the heating furnace tube so as to improve the construction progress.
According to one aspect of the invention, the assembly welding movable welding platform of the heating furnace tube comprises a supporting bracket and an assembly welding bracket, wherein the assembly welding bracket is connected with the supporting bracket through a rotating supporting shaft; the assembly welding bracket comprises a supporting beam, an arc beam and a carrier roller,
the arc-shaped beams are bent downwards, and a plurality of parallel arc-shaped beams are longitudinally arranged to form an arc-shaped supporting surface; a plurality of parallel supporting beams are transversely arranged at the lower part of the arc-shaped supporting surface, the upper surface of each arc-shaped beam is fixedly connected with a plurality of carrier rollers which are arranged at intervals, and arc-shaped grooves capable of bearing the furnace tubes to be assembled are arranged on the upper surfaces of the carrier rollers; the arc-shaped beams on the two sides of the carrier roller are provided with connecting holes for connecting the U-shaped hoops; the rotary supporting shaft is detachably connected with the supporting beam in the middle.
Furthermore, one end of the supporting beam on the two sides is provided with a lifting lug.
Furthermore, the arc-shaped supporting surface consists of 6 parallel arc-shaped beams, two arc-shaped beams are a group and are respectively arranged at the two ends and the middle part of the supporting beam, and the welding opening of the furnace tube group in time alignment is positioned between the two arc-shaped beams at the middle part; the supporting beam comprises two end supporting beams and a middle supporting beam, the two end supporting beams are respectively connected with the two ends of the arc-shaped beam, and the middle supporting beam is connected with the middle part of the arc-shaped beam.
And further, the temporary support is used for supporting two sides of the butt welding port when the furnace tube group is welded, the temporary support comprises a base, two end columns and a middle column, and an inclined support is arranged between the end columns and the middle column.
Furthermore, six uniformly distributed carrier rollers are fixed on the upper surface of the arc-shaped beam.
Further, the support bracket is a triangular support structure formed by welding channel steel, the support bracket is symmetrically arranged at two ends of the assembly welding support, the tops of the two support brackets are respectively provided with a rotating support shaft, one end of each rotating support shaft is rotatably connected with the support bracket, and the other end of each rotating support shaft is connected with the middle support beam through bolts.
According to another aspect of the present invention, there is provided a method for assembling, welding, installing and constructing a furnace tube of a heating furnace, which is operated by using the above-mentioned assembling, welding and moving welding platform for a furnace tube of a heating furnace, comprising the steps of:
placing two furnace tubes to be assembled into a group on a carrier roller of an assembly welding mobile welding platform of the furnace tubes of the heating furnace, wherein a welded junction is positioned in the middle of an assembly welding bracket, a bolt is installed after the bottom of a U-shaped hoop penetrates through a connecting hole on an arc beam, and the furnace tubes to be assembled are fixed through the U-shaped hoop;
in the welding process, the assembly welding bracket is rotated, so that the workers can work on the upper surface and the lower surface of the furnace tube;
after the assembly welding is finished, hoisting the assembly welding bracket by using a crane, and dismantling the support bracket and the rotary support shaft;
and hoisting the assembly subjected to assembly welding into the heating furnace, placing the assembly on the bottom bracket, hanging the upper part of the bolt tightly screwed on the bottom bracket on the spring hanger, then removing the U-shaped hoop for fixing the furnace tube on the assembly welding support, hoisting the assembly welding support out, and installing the furnace tube.
Furthermore, the spring is tensioned and debugged before the spring hanger is installed, the debugging value is adjusted to the specified cold-state installation position, and the spring is in a cold-state locking state.
The invention provides a rotatable assembly welding movable welding platform, and during butt welding, workers can select to perform continuous welding on the upper surface and the lower surface of a furnace tube by rotating an assembly welding bracket, so that the aims of facilitating welding, improving welding qualification rate and ensuring construction quality are fulfilled. The whole furnace tube group is welded, the welded junction is assembled and welded, the position is on the ground, the operation is not limited in space, and the welding qualified rate is improved. The furnace tube is hoisted into the furnace after being prefabricated and assembled into components in a slicing way, and the movable welding platform can be used as a hanger for hoisting the furnace tube so as to improve the construction progress. Before hoisting, hoisting the hoisting point of the welding bracket by using a crane, and dismantling the support bracket and the rotary support shaft to avoid collision with the outer wall of the furnace body in the hoisting process.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate exemplary embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention.
Fig. 1 is a schematic structural diagram of an assembly welding mobile welding platform of a heating furnace tube provided by the invention.
Fig. 2 is another structural schematic diagram of the assembly welding mobile welding platform of the heating furnace tube provided by the invention.
In the figure, 1-support bracket, 2-rotary support shaft, 3-support beam, 4-arc beam, 5-carrier roller, 6-furnace tube, 7-U-shaped hoop, 8-butt, 9-temporary support, 10-pigtail tube and 11-lifting lug.
Detailed Description
In order that those skilled in the art will better understand the present invention, a more complete and complete description of the present invention is provided below in conjunction with the accompanying drawings and embodiments. In addition, the features of the embodiments and examples in the present application may be combined with each other without conflict.
The invention provides an assembly welding movable welding platform of a heating furnace tube, which comprises a support bracket 1 and an assembly welding bracket, wherein the assembly welding bracket is connected with the support bracket 1 through a rotary support shaft 2; the assembly welding support comprises a support beam 3, arc-shaped beams 4 and a carrier roller 5, wherein the arc-shaped beams 4 are bent downwards, and a plurality of parallel arc-shaped beams 4 are longitudinally arranged to form an arc-shaped support surface; a plurality of parallel supporting beams 3 are transversely arranged at the lower part of the arc-shaped supporting surface, the upper surface of each arc-shaped beam 4 is fixedly connected with a plurality of carrier rollers 5 which are arranged at intervals, and the upper surface of each carrier roller 5 is provided with an arc-shaped groove which can support a furnace tube to be assembled; the arc-shaped beams 4 on the two sides of the carrier roller 5 are provided with connecting holes for connecting U-shaped hoops; the rotary supporting shaft 2 is detachably connected with a supporting beam 3 in the middle.
The idea of this embodiment is to make a rotatable assembly welding mobile welding platform, as shown in fig. 1, an arc support surface is formed by a plurality of arc beams 4 to bear the weight of the furnace tube. When the furnace tubes are assembled and welded, two furnace tubes 6 needing to be welded in an aligned mode are placed on a carrier roller 5 of an arc-shaped supporting surface, a welded junction is arranged in the middle of an assembling and welding support, a bolt is installed after the bottom of a U-shaped hoop 7 penetrates through a connecting hole in an arc-shaped beam 4, and the furnace tubes 6 are fixed through the U-shaped hoop 7. A plurality of furnace tubes 6 to be paired can be fixed on the arc-shaped supporting surface in parallel.
Before welding, the wall thickness of the periphery of the welding opening is polished, the wall thickness of the butt joint part of the butt welding pipe and the sharp bend is the same, and the grinding butt joint processing amount is very large. The assembly welding support provided by the embodiment can rotate 180 degrees, and during butt welding, an operator can select to perform continuous welding on the upper surface and the lower surface of the furnace tube by rotating the assembly welding support, so that the aims of facilitating welding, improving the welding qualification rate and ensuring the construction quality are fulfilled.
The assembly welding movable welding platform provided by the invention has the function of reinforcing the hanging bracket, and the assembly welding support plays a role of a balance beam during hoisting. After the assembly welding is completed, the assembly welding support is hoisted by a crane, preferably, a lifting lug 11 is arranged at one end of each supporting beam on two sides, the lifting lugs are hoisted by the crane, a connecting bolt between the rotary supporting shaft 2 and the assembly welding support is loosened, and the support and the rotary supporting shaft 2 are detached so as to avoid collision with the outer wall of the furnace body in the hoisting process. The furnace tube is hoisted into the furnace by the radiation section top opening, the furnace tube component is hoisted to penetrate into the hearth and is placed on the bottom bracket, the bolt on the bottom bracket is tightened, the upper part of the bolt is hung on the spring hanger, then the U-shaped hoop 7 for fixing the furnace tube 6 on the assembly welding bracket is removed, the assembly welding bracket is hoisted out, and the heat-resistant lining plate of the furnace tube is installed after all the furnace tubes are installed.
In a relatively specific embodiment, the arc-shaped supporting surface is composed of 6 parallel arc-shaped beams 4, two arc-shaped beams 4 are arranged in a group at two ends and in the middle of the supporting beam 3 respectively, and the welding opening of the furnace tube group pair is positioned between the two arc-shaped beams 4 in the middle (as shown in fig. 1). The support beam 4 comprises two end support beams and a middle support beam, the two end support beams are respectively connected with two ends of the arc-shaped beam, and the middle support beam is connected with the middle part of the arc-shaped beam.
In order to prevent the deflection deformation during welding, the present embodiment includes temporary supports 9 for supporting both sides of the crater during welding of the furnace tube set pair, and as shown in fig. 2, the temporary supports 9 include a base, two end pillars, and a middle pillar, and an inclined support is provided between the end pillars and the middle pillar. After the assembly welding support is rotated to the position, the temporary support is placed at the bottom of the assembly welding support.
Relatively specifically, support bracket 1 is the triangle bearing structure who forms by the channel-section steel welding, and support bracket sets up at assembly welding support both ends symmetry, and 1 tops of two support brackets respectively set up a swivel support shaft 2, swivel support shaft 2 one end is rotated with support bracket 1 and is connected, the other end passes through bolted connection with middle supporting beam.
The claimed invention will be described more clearly and more fully below with reference to a relatively specific embodiment.
The HK40 furnace tube and the sharp bend are welded to form the furnace tube component. The HK40 furnace tube and the sharp bend are both cast and formed pipe elements. The nominal diameter DN150mm of the HK40 furnace tube is 7m, and 2 tubes are butted into 14m furnace tubes. The central bending diameter of the 180-degree sharp bend elbow pipe is 350 mm. The whole assembly consists of 6 pipes of 14m and sharp bends, and the length of the assembly is 14.7m and the width of the assembly is 1.75 m.
The assembly welding movable welding platform for the heating furnace tube provided by the embodiment comprises a support bracket 1 and an assembly welding bracket.
The assembly welding support comprises a support beam 3, an arc-shaped beam 4 and a carrier roller 5. The arc-shaped beam 4 is an arc-shaped piece with the arc length of 2m formed by bending 10# channel steel or 20# channel steel, and six arc-shaped beams 4 are longitudinally arranged in parallel at equal intervals to form an arc-shaped supporting surface. 6 carrier rollers 5 which are arranged at equal intervals are fixed on the upper surface of each arc-shaped beam, and arc-shaped grooves which can support the furnace tubes to be assembled are arranged on the upper surfaces of the carrier rollers 5; and the arc beams 4 on two sides of the carrier roller 5 are provided with phi =16mm connecting holes for connecting a U-shaped hoop 7, the furnace tubes 6 are paired, and the furnace tubes 6 to be assembled and welded are fixed by the phi =12mm U-shaped hoop during assembly and welding. The arc-shaped beam 4 is longitudinally arranged to form an arc-shaped supporting surface; the lower part of the arc-shaped supporting surface is transversely provided with three parallel 30# channel steel beams serving as supporting beams 3.
The support bracket 1 is a triangular support structure formed by welding channel steel, the support bracket is symmetrically arranged at two ends of the assembly welding bracket, two rotary support shafts 2 are respectively arranged at the tops of the two support brackets, one end of each rotary support shaft 2 is rotatably connected with the support bracket, and the other end of each rotary support shaft is connected with an intermediate support beam through a bolt.
During welding, temporary supports 9 are arranged below two sides of a weld crater, and each temporary support is formed by oppositely drawing 30# channel steel groove surfaces and 10# channel steel.
The assembly welding movable welding platform of the heating furnace tube is used as a welding platform and a welded hanging bracket.
The invention further provides a furnace tube assembly welding and installation construction method realized by the assembly welding mobile welding platform of the heating furnace tube.
Specifically, the furnace tube assembly welding and installation construction method comprises the following steps: placing two furnace tubes 6 to be assembled into a group on a carrier roller 5 of an assembly welding mobile welding platform of the furnace tube of the heating furnace, wherein a welding opening is positioned in the middle of an assembly welding bracket, a bolt is installed after the bottom of a U-shaped hoop 7 passes through a connecting hole on an arc-shaped beam 4, and the furnace tubes 6 to be assembled are fixed through the U-shaped hoop 7;
in the welding process, the assembly welding bracket is rotated, so that the workers can work on the upper surface and the lower surface of the furnace tube;
after the assembly welding is finished, hoisting the assembly welding bracket by using a crane, and dismantling the support bracket 1 and the rotary support shaft 2;
and hoisting the assembly subjected to assembly welding into the heating furnace, placing the assembly on the bottom bracket, hanging the upper part of the bolt tightly screwed on the bottom bracket on the spring hanger, then removing the U-shaped hoop 7 for fixing the furnace tube 6 on the assembly welding bracket, hoisting the assembly welding bracket out, and installing the furnace tube 6.
Hoisting the furnace tubes in sequence, and paying attention to the direction of the joints of the furnace tubes connected with the upper and lower pigtail tubes corresponding to the joint of the header; and (3) aligning after all the furnace tubes are in place, strictly constructing the spacing of the furnace tubes according to the graph, wherein the verticality of the furnace tubes is 1/1000 mm, the maximum deviation cannot exceed 10mm, the relative clearance between the furnace tubes and the upper guide ring meets the design requirement, the clearance is 6mm, and the annular clearance of the furnace tubes passing through the bottom of the furnace is ensured to be uniform and cannot be eccentric.
Before the furnace tube is hoisted, the spring hanger for suspending the furnace tube at the upper part of the furnace tube is installed in place. The spring is tensioned and debugged before the spring hanger is installed, the debugging value is adjusted to the specified cold-state installation position, and the spring is in a cold-state locking state. After the furnace tube is installed and filled with the catalyst, the spring locking device is opened, the suspension lead screw is adjusted to tighten the furnace tube, the spring pointer is adjusted to the cold position, and then the adjusting rod back cap is locked.
After the furnace pipe components are hoisted into the furnace body, the upper pigtails are sequentially installed one by one, and the pigtails are assembled in a free state and cannot be strongly paired. And a clearance of 1-1.5 mm is kept between the pig tail pipe and the inserting concave table which are connected in a socket mode.
By adopting the construction method, the installation quality and the progress of the heating furnace can be ensured, the safe operation of the heating furnace can be ensured, the construction investment can be saved, the construction cost can be reduced while the construction quality is ensured, and the construction period can be shortened.
The scope of the invention is not limited to the above embodiments, and various modifications and changes may be made by those skilled in the art, and any modifications, improvements and equivalents within the spirit and principle of the invention should be included in the scope of the invention.
Claims (8)
1. A heating furnace tube assembly welding movable welding platform comprises a supporting bracket and an assembly welding bracket, wherein the assembly welding bracket is connected with the supporting bracket through a rotating supporting shaft; the assembly welding bracket comprises a supporting beam, an arc beam and a carrier roller,
the arc-shaped beams are bent downwards, and a plurality of parallel arc-shaped beams are longitudinally arranged to form an arc-shaped supporting surface; a plurality of parallel supporting beams are transversely arranged at the lower part of the arc-shaped supporting surface, the upper surface of each arc-shaped beam is fixedly connected with a plurality of carrier rollers which are arranged at intervals, and arc-shaped grooves capable of bearing the furnace tubes to be assembled are arranged on the upper surfaces of the carrier rollers; the arc-shaped beams on the two sides of the carrier roller are provided with connecting holes for connecting the U-shaped hoops; the rotary supporting shaft is detachably connected with the supporting beam in the middle.
2. The assembly welding mobile welding platform of the heating furnace tube of claim 1, which is characterized in that: one end of the supporting beam on the two sides is provided with a lifting lug.
3. The assembly welding mobile welding platform of the heating furnace tube of claim 1 or 2, which is characterized in that: the arc-shaped supporting surface consists of 6 parallel arc-shaped beams, two arc-shaped beams are a group and are respectively arranged at the two ends and the middle part of the supporting beam, and a welding opening for the time alignment of the furnace tube group is positioned between the two arc-shaped beams at the middle part; the supporting beam comprises two end supporting beams and a middle supporting beam, the two end supporting beams are respectively connected with the two ends of the arc-shaped beam, and the middle supporting beam is connected with the middle part of the arc-shaped beam.
4. The assembly welding mobile welding platform of the heating furnace tube of claim 4, which is characterized in that: the temporary support comprises a base, two end columns and a middle column, and an inclined support is arranged between the end columns and the middle column.
5. The assembly welding mobile welding platform of the heating furnace tube of claim 3, which is characterized in that: six evenly distributed carrier rollers are fixed on the upper surface of the arc-shaped beam.
6. The assembly welding mobile welding platform of the heating furnace tube of claim 1, 2 or 4, which is characterized in that: the supporting bracket is a triangular supporting structure formed by welding channel steel, the supporting bracket is symmetrically arranged at two ends of the assembly welding bracket, two rotating supporting shafts are respectively arranged at the tops of the two supporting brackets, one end of each rotating supporting shaft is rotatably connected with the supporting bracket, and the other end of each rotating supporting shaft is connected with the middle supporting beam through bolts.
7. An assembly welding installation construction method of a heating furnace tube, which is characterized in that the assembly welding mobile welding platform of the heating furnace tube according to claim 1 is adopted for operation, and comprises the following steps:
placing two furnace tubes to be assembled into a group on a carrier roller of an assembly welding mobile welding platform of the furnace tubes of the heating furnace, wherein a welded junction is positioned in the middle of an assembly welding bracket, a bolt is installed after the bottom of a U-shaped hoop penetrates through a connecting hole on an arc beam, and the furnace tubes to be assembled are fixed through the U-shaped hoop;
in the welding process, the assembly welding bracket is rotated, so that the workers can work on the upper surface and the lower surface of the furnace tube;
after the assembly welding is finished, hoisting the assembly welding bracket by using a crane, and dismantling the support bracket and the rotary support shaft;
and hoisting the assembly subjected to assembly welding into the heating furnace, placing the assembly on the bottom bracket, hanging the upper part of the bolt tightly screwed on the bottom bracket on the spring hanger, then removing the U-shaped hoop for fixing the furnace tube on the assembly welding support, hoisting the assembly welding support out, and installing the furnace tube.
8. The assembly welding installation construction method of the heating furnace tube according to claim 7, characterized in that: the spring is tensioned and debugged before the spring hanger is installed, the debugging value is adjusted to the specified cold-state installation position, and the spring is in a cold-state locking state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010318202.6A CN111299955A (en) | 2020-04-21 | 2020-04-21 | Assembly welding movable welding platform of heating furnace tube and assembly welding installation construction method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010318202.6A CN111299955A (en) | 2020-04-21 | 2020-04-21 | Assembly welding movable welding platform of heating furnace tube and assembly welding installation construction method |
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| Publication Number | Publication Date |
|---|---|
| CN111299955A true CN111299955A (en) | 2020-06-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010318202.6A Pending CN111299955A (en) | 2020-04-21 | 2020-04-21 | Assembly welding movable welding platform of heating furnace tube and assembly welding installation construction method |
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| Country | Link |
|---|---|
| CN (1) | CN111299955A (en) |
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2020
- 2020-04-21 CN CN202010318202.6A patent/CN111299955A/en active Pending
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