CN112729503A - Weighbridge weighing support device and mounting method thereof - Google Patents
Weighbridge weighing support device and mounting method thereof Download PDFInfo
- Publication number
- CN112729503A CN112729503A CN202011504471.8A CN202011504471A CN112729503A CN 112729503 A CN112729503 A CN 112729503A CN 202011504471 A CN202011504471 A CN 202011504471A CN 112729503 A CN112729503 A CN 112729503A
- Authority
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- China
- Prior art keywords
- weighing
- buffer block
- embedded part
- weighing sensor
- support
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- Pending
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Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G19/00—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups
- G01G19/02—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups for weighing wheeled or rolling bodies, e.g. vehicles
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/32—Foundations for special purposes
- E02D27/44—Foundations for machines, engines or ordnance
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
- E02D31/02—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution against ground humidity or ground water
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G21/00—Details of weighing apparatus
- G01G21/02—Arrangements of bearings
- G01G21/08—Bearing mountings or adjusting means therefor
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G23/00—Auxiliary devices for weighing apparatus
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G23/00—Auxiliary devices for weighing apparatus
- G01G23/06—Means for damping oscillations, e.g. of weigh beams
Abstract
The invention discloses a loadometer weighing support device and an installation method thereof, and the loadometer weighing support device comprises a base and a weighing platform, wherein the top of the base is provided with an embedded part, the embedded part is in sliding sleeve joint with a buffer block, the top of the buffer block is fixedly connected with a support, the top of the support is provided with an assembly plate, the assembly plate is provided with a weighing sensor, the weighing platform is arranged above the weighing sensor, the embedded part is internally provided with a first buffer spring and a second buffer spring, the bottom of the weighing platform is provided with a screen plate, and the assembly plate is provided with a cooling fan. Meanwhile, the weighing sensor is dustproof, and the radiating fan accelerates the heat dissipation of the weighing sensor.
Description
Technical Field
The invention relates to the technical field of loadometer, in particular to a loadometer weighing support device and an installation method thereof.
Background
The weighbridge is a heavy-weight electronic weighing apparatus, and is a large weighing scale arranged on the ground, which is generally used for weighing the loaded tonnage of a truck, and is also called a truck scale, and is a main weighing device for measuring bulk goods of factories, mines, merchants and the like; when the goods enter the loadometer, under the action of the gravity of the goods, the weighing sensor elastomer generates elastic deformation, the weighing sensor outputs a digital signal, and the digital signal is processed and then enters the weighing display instrument to directly display data such as weight and the like.
The disadvantages of the prior art wagon balance are: each position load of car is inconsistent, get into the weighbridge weighing face after because vehicle self vibration with rock and can reduce weighing accuracy and efficiency of weighing, the time has still been of a specified duration and still can cause the damage to the sensor consequently, reduce the life of weighbridge, weighing sensor is a device that changes mass signal into measurable signal of telecommunication output, the actual operational environment that the sensor was located needs to be considered in the sensor use, it is related to whether the sensor can normally work and its safety and life, for guaranteeing reliability and the security of whole sensor, it is vital for weighing sensor sets up reasonable reliable weighbridge weighing support, and still solve the limited problem of the ground basis bearing capacity of weighbridge lower part.
Disclosure of Invention
The present invention is directed to a weighbridge weighing support device and a method for mounting the same, which solves the above problems.
In order to achieve the purpose, the invention provides the following technical scheme:
the utility model provides a weighbridge weighing support device, includes base and weighing platform, the base main part is reinforced concrete layer, and the base top is provided with the built-in fitting, and the built-in fitting cup joints with the buffer block slip, and buffer block top fixedly connected with support, the whole quadrangular frustum form frame construction that is of support, the assembly plate is installed at the support top, installs weighing sensor on the assembly plate, is provided with the rubber pad between weighing sensor and the assembly plate, the weighing platform sets up in the weighing sensor top.
As a further scheme of the invention: the top of the reinforced concrete layer is coated with a hydrophobic layer, and the bottom of the reinforced concrete layer is provided with a rigid waterproof layer.
As a further scheme of the invention: the embedded part is in a hollow columnar shape, a cavity in the embedded part forms a sliding cavity, the buffer block is installed in the sliding cavity, a first buffer spring and a second buffer spring are installed in the sliding cavity, the second buffer spring is installed in the first buffer spring, the first buffer spring is movably connected with the embedded part and the buffer block, the upper end of the second buffer spring is fixedly connected with the bottom of the buffer block, cross rods are fixedly connected to two sides of the bottom of the embedded part, and the cross rods are threaded steel bars.
As a further scheme of the invention: the clamping ring is installed at the top of the buffer block, a groove corresponding to the clamping ring is formed in the edge of the top of the buffer block, the clamping ring is fixedly connected with the top of the embedded part through a fixing bolt, and threaded holes corresponding to the fixing bolt are formed in the embedded part and the clamping ring.
As a further scheme of the invention: the weighing sensor buffer block, the rubber pad, the assembling plate and the support are fixedly connected through the fixing bolts, and through holes are formed in the positions, corresponding to the fixing bolts, of the weighing sensor, the rubber pad, the assembling plate and the support.
As a further scheme of the invention: the support includes underframe, bracing and upper ledge, and underframe and bracing bottom are by fixing bolt fixed back welded connection, and underframe and buffer block are by fixing bolt fixed connection, and the underframe is the square frame, and the upper ledge is welded connection behind the bracing top by fixing bolt fixed mounting, and the upper ledge is the square frame, installs between underframe and the bracing and strengthens the bracing, strengthens bracing and underframe, bracing by fixing bolt fixed back welded connection.
As a further scheme of the invention: the width of underframe is greater than the width of upper ledge, and the position that corresponds fixing bolt on buffer block, underframe, bracing and the upper ledge all is provided with the screw hole.
As a further scheme of the invention: the bottom of the weighing platform is fixedly connected with a screen plate on the peripheral side of the weighing sensor, the screen plate is sleeved with the assembling plate in a sliding manner, and silica gel particles are filled in the screen plate.
As a further scheme of the invention: a cooling fan is fixedly mounted on the assembling plate through a support and is located on the right side of the weighing sensor.
A method for installing a weighbridge weighing support device comprises the following steps: firstly, excavating a foundation, flattening and compacting an original soil layer, and paving a rigid waterproof layer; secondly, a reinforced concrete layer is poured on the rigid waterproof layer, the embedded part is embedded in the reinforced concrete when the reinforced concrete layer is poured, and the top surface of the embedded part is kept horizontal when the embedded part is arranged; step three, after the concrete is solidified, spraying a hydrophobic layer on the top of the reinforced concrete layer; connecting and fixing the bottom frame, the inclined strut, the upper frame and the reinforcing strut by using fixing bolts, and welding and reinforcing all contact points; step five, welding and fixing a buffer spring II at the bottom of a buffer block, and sequentially installing the buffer spring I and the buffer block in a sliding cavity in the embedded part; sixthly, mounting the pressure ring on the embedded part; step seven, mounting the assembled and welded support on a buffer block, and then mounting an assembling plate, a rubber pad and a weighing sensor on the top of the support by using a fixing bolt; step eight, mounting the cooling fan on an assembly plate, and fixing the mesh plate filled with the silica gel particles at the bottom of the weighing platform by using screws; and step nine, mounting the weighing platform above the weighing sensor.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention has simple form, reasonable structural design and convenient and quick installation, and the base is made of reinforced concrete, thereby improving the bearing capacity of the foundation, providing a stable foundation for the weighing process and prolonging the service life of the wagon balance.
2. The hydrophobic layer and the rigid waterproof layer arranged in the invention enable the use environment of the base to be better, and the service life of the base is prolonged.
3. The cross rods arranged on the two sides of the embedded part enhance the connectivity of the embedded part and the base, so that the embedded part is more stable, meanwhile, the embedded part is in a hollow cylindrical shape, so that the bearing area of the base is larger, the pressure intensity of the base in the weighing process is effectively reduced, and the service life of the base is prolonged.
4. The support is in a quadrangular frustum pyramid shape and assembled by combining bolt connection and welding, so that the support is better in stability, more durable and stronger in pressure resistance, the influence of vibration and shaking of the symmetrical weighing sensor caused by instability of the support is reduced, a stable working environment is provided for the weighing sensor, the service life of the weighing sensor can be longer, the calibration times are reduced as far as possible, and the working efficiency of the weighbridge is improved.
5. According to the invention, the buffer block, the buffer spring I and the buffer spring II are matched for secondary buffering, so that the impact on the weighing sensor when a vehicle runs into the wagon balance can be effectively reduced, and the service life of the weighing sensor is prolonged.
6. According to the invention, the arranged screen plate and the silica gel particles filled in the screen plate can effectively adsorb moisture near the weighing sensor, and meanwhile, the screen plate can play a certain dustproof role, so that the working environment of the weighing sensor is improved, and the possibility of environmental damage of the weighing sensor is reduced.
7. The invention accelerates the heat dissipation of the weighing sensor through the heat dissipation fan, and avoids the damage of the weighing sensor due to overhigh temperature or the reduction of the weighing precision due to high temperature.
Drawings
Fig. 1 is a front view structure schematic diagram of a weighbridge weighing support device.
Fig. 2 is a schematic view of a base structure.
Fig. 3 is a schematic top view of the bottom frame.
Fig. 4 is a schematic top view of the upper frame.
Fig. 5 is a top view of the mounting plate.
FIG. 6 is a schematic view of a cross-sectional enlarged structure of the screen plate.
In the figure: the device comprises a base 1, a weighing platform 2, a support 3, a reinforced concrete layer 4, a hydrophobic layer 5, a rigid waterproof layer 6, an embedded part 7, a buffer block 8, a sliding cavity 9, a first buffer spring 10, a second buffer spring 11, a cross rod 12, a pressing ring 13, a groove 14, a fixing bolt 15, a threaded hole 16, an assembly plate 17, a weighing sensor 18, a rubber pad 19, a through hole 20, a bottom frame 21, an inclined strut 22, an upper frame 23, a reinforcing strut 24, a screen plate 25, silica gel particles 26, a support 27 and a cooling fan 28.
Detailed Description
Referring to fig. 1 to 6, in the embodiment of the present invention, a loadometer weighing support apparatus includes a base 1 and a weighing platform 2, a main body of the base 1 is cast by a reinforced concrete layer 4, so that a bearing capacity of a foundation is improved, a stable foundation is provided for a weighing process, a service life of the loadometer is prolonged, a hydrophobic layer 5 is sprayed on a top of the reinforced concrete layer 4, and a rigid waterproof layer 6 is disposed at a bottom of the reinforced concrete layer 4, so that a service environment of the base 1 is kept good, the loadometer is not corroded by water, and the service life of the base 1 is prolonged.
Preferably, the embedded part 7 is arranged at the top of the base 1, the embedded part 7 is hollow and columnar, so that the bearing area of the base 1 is larger, the pressure intensity of the base 1 in the weighing process is effectively reduced, the service life of the base 1 is prolonged, a cavity in the embedded part 7 forms a sliding cavity 9, the buffer block 8 is arranged in the sliding cavity 9, the embedded part 7 is in sliding sleeve connection with the buffer block 8, a first buffer spring 10 and a second buffer spring 11 are arranged in the sliding cavity 9, the second buffer spring 11 is arranged in the first buffer spring 10, the first buffer spring 10 is movably connected with the embedded part 7 and the buffer block 8, the upper end of the second buffer spring 11 is fixedly connected with the bottom of the buffer block 8, and the arranged buffer block 8, the first buffer spring 10 and the second buffer spring 11 are matched for secondary buffering, so that the impact of the weighing sensor 18 when a vehicle drives into a ground pound can be effectively reduced, and the service life of the weighing sensor 18, 7 bottom both sides fixedly connected with horizontal pole 12 of built-in fitting, horizontal pole 12 is the twisted steel, the connectivity of built-in fitting 7 with base 1 has been strengthened, bearing structure's wholeness has been strengthened, make built-in fitting 7 more firm, clamping ring 13 is installed at 8 tops of buffer block, 8 top borders of buffer block are provided with the recess 14 that corresponds with clamping ring 13, clamping ring 13 is by fixing bolt 15 fixed connection with 7 tops of built-in fitting, be provided with the screw hole 16 that corresponds with fixing bolt 15 on built-in fitting 7 and the clamping ring 13, 8 top fixedly connected with supports 3 of buffer block.
It should be noted that the diameter and the length of the second buffer spring 11 are both smaller than those of the first buffer spring 10, when the vehicle drives into the ground pound, firstly, the buffer block 8 moves downwards to compress the first buffer spring 10 until the lower end of the second buffer spring 11 contacts the bottom of the sliding cavity 9, and then the second buffer spring 11 is compressed by the buffer block 8, so that the impact brought by the vehicle is buffered for the second time, and the possibility of damage to the weighing sensor 18 is reduced.
Preferably, the support 3 is integrally in a quadrangular frustum pyramid frame structure, the support 3 includes a bottom frame 21, an inclined strut 22 and an upper frame 23, the bottom ends of the bottom frame 21 and the inclined strut 22 are fixed by fixing bolts 15 and then welded, the bottom frame 21 and the buffer block 8 are fixedly connected by fixing bolts 15, the bottom frame 21 is a square frame, the upper frame 23 is fixedly mounted on the top end of the inclined strut 22 by fixing bolts 15 and then welded, the upper frame 23 is a square frame, a reinforcing strut 24 is mounted between the bottom frame 21 and the inclined strut 22, the reinforcing strut 24 is fixed by fixing bolts 15 and then welded with the bottom frame 21 and the inclined strut 22, the width of the bottom frame 21 is greater than that of the upper frame 23, threaded holes 16 are respectively arranged at positions on the buffer block 8, the bottom frame 21, the inclined strut 22 and the upper frame 23 corresponding to the fixing bolts 15, the support 3 is assembled by adopting a mode of connecting and welding the fixing bolts 15, so that the support 3 has better stability, more durability and stronger pressure resistance, the influence of vibration and shaking of the weighing sensor 18 caused by instability of the support 3 is reduced, a stable working environment is provided for the weighing sensor 18, the service life of the weighing sensor 18 is prolonged, the calibration times are reduced as much as possible, and the working efficiency of the wagon balance is increased.
Preferably, an assembly plate 17 is installed at the top of the support 3, a weighing sensor 18 is installed on the assembly plate 17, a rubber pad 19 is arranged between the weighing sensor 18 and the assembly plate 17, rigid impact between the weighing sensor 18 and the assembly plate 17 when a vehicle enters the weighing platform 2 is reduced, the weighing sensor 18 is prevented from being damaged, the weighing platform 2 is arranged above the weighing sensor 18, the buffer block 8 of the weighing sensor 18, the rubber pad 19, the assembly plate 17 and the support 3 are fixedly connected through a fixing bolt 15, through holes 20 are formed in the positions, corresponding to the fixing bolt 15, of the weighing sensor 18, the rubber pad 19, the assembly plate 17 and the support 3, a mesh plate 25 is fixedly connected to the bottom of the weighing platform 2 on the periphery side of the weighing sensor 18, dust in air can be effectively organized to influence the precision of the weighing sensor 18 and even cause damage, and the mesh plate 25 is in, silica gel particles 26 are filled in the screen plate 25, moisture near the weighing sensor 18 can be effectively adsorbed, the working environment of the weighing sensor is improved, the possibility that the weighing sensor 18 is damaged due to environmental influence is reduced, a cooling fan 28 is fixedly installed on the assembly plate 17 through a support 27, the cooling fan 28 is located on the right side of the weighing sensor 18, the weighing sensor 18 is cooled by opening the cooling fan 28, and the phenomenon that the weighing precision is reduced due to damage caused by overhigh temperature or due to high-temperature influence is avoided.
A method for installing a weighbridge weighing support device comprises the following steps: firstly, excavating a foundation, flattening and compacting an original soil layer, and paving a rigid waterproof layer 6; secondly, a reinforced concrete layer 4 is poured on the rigid waterproof layer 6, an embedded part 7 is embedded in the reinforced concrete when the reinforced concrete layer 4 is poured, and the top surface of the embedded part 7 is kept horizontal when the embedded part 7 is arranged; thirdly, after the concrete is solidified, spraying a hydrophobic layer 5 on the top of the reinforced concrete layer 4; step four, connecting and fixing the bottom frame 21, the inclined strut 22, the upper frame 23 and the reinforcing strut 24 by using the fixing bolt 15, and welding and reinforcing all contact points; step five, welding and fixing a second buffer spring 11 at the bottom of the buffer block 8, and sequentially installing a first buffer spring 10 and the buffer block 8 in a sliding cavity 9 in the embedded part 7; sixthly, mounting the pressure ring 13 on the embedded part 7; step seven, mounting the assembled and welded support 3 on the buffer block 8, and then mounting the assembling plate 17, the rubber pad 19 and the weighing sensor 18 on the top of the support 3 by using the fixing bolt 15; step eight, installing a cooling fan 28 on the assembling plate 17, and fixing the screen plate 25 filled with the silica gel particles 26 at the bottom of the weighing platform 2 by using screws; and step nine, mounting the weighing platform 2 above the weighing sensor 18.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes in the embodiments and/or modifications of the invention can be made, and equivalents and modifications of some features of the invention can be made without departing from the spirit and scope of the invention.
Claims (10)
1. The utility model provides a weighbridge weighing support device, includes base (1) and weighing platform (2), its characterized in that, base (1) main part is reinforced concrete layer (4), and base (1) top is provided with built-in fitting (7), and built-in fitting (7) cup joint with buffer block (8) slip, and buffer block (8) top fixedly connected with support (3), support (3) wholly are four prismatic table form frame construction, and mounting plate (17) are installed at support (3) top, install weighing sensor (18) on mounting plate (17), are provided with rubber pad (19) between weighing sensor (18) and mounting plate (17), weighing platform (2) set up in weighing sensor (18) top.
2. The weighbridge weighing support device according to claim 1, wherein a hydrophobic layer (5) is sprayed on the top of the reinforced concrete layer (4), and a rigid waterproof layer (6) is arranged at the bottom of the reinforced concrete layer (4).
3. The weighbridge weighing support device according to claim 1, wherein the embedded part (7) is in a hollow cylindrical shape, a cavity in the embedded part (7) forms a sliding cavity (9), the buffer block (8) is installed in the sliding cavity (9), a first buffer spring (10) and a second buffer spring (11) are installed in the sliding cavity (9), the second buffer spring (11) is installed in the first buffer spring (10), the first buffer spring (10) is movably connected with the embedded part (7) and the buffer block (8), the upper end of the second buffer spring (11) is fixedly connected with the bottom of the buffer block (8), cross rods (12) are fixedly connected to two sides of the bottom of the embedded part (7), and the cross rods (12) are threaded steel bars.
4. The weighbridge weighing support device according to claim 1, characterized in that a press ring (13) is mounted at the top of the buffer block (8), a groove (14) corresponding to the press ring (13) is formed in the edge of the top of the buffer block (8), the press ring (13) is fixedly connected with the top of the embedded part (7) through a fixing bolt (15), and threaded holes (16) corresponding to the fixing bolt (15) are formed in the embedded part (7) and the press ring (13).
5. The weighbridge weighing support device according to claim 1, wherein the weighing sensor (18) buffer block (8), the rubber pad (19), the assembling plate (17) and the support (3) are fixedly connected through a fixing bolt (15), and through holes (20) are formed in the positions, corresponding to the fixing bolt (15), of the weighing sensor (18), the rubber pad (19), the assembling plate (17) and the support (3).
6. The corbel weight scale according to claim 1, wherein the corbel (3) comprises a bottom frame (21), an inclined strut (22) and an upper frame (23), the bottom ends of the bottom frame (21) and the inclined strut (22) are fixed by fixing bolts (15) and then welded, the bottom frame (21) and the buffer block (8) are fixedly connected by fixing bolts (15), the bottom frame (21) is a square frame, the upper frame (23) is fixedly mounted on the top ends of the inclined strut (22) by fixing bolts (15) and then welded, the upper frame (23) is a square frame, a reinforcing strut (24) is mounted between the bottom frame (21) and the inclined strut (22), and the reinforcing strut (24) is welded with the bottom frame (21) and the inclined strut (22) after being fixed by fixing bolts (15).
7. A loadometer weighing support device as claimed in claim 6, wherein the width of the bottom frame (21) is greater than that of the upper frame (23), and the positions of the buffer block (8), the bottom frame (21), the diagonal brace (22) and the upper frame (23) corresponding to the fixing bolt (15) are provided with threaded holes (16).
8. The weighbridge weighing support device according to claim 1, wherein a screen plate (25) is fixedly connected to the bottom of the weighing platform (2) on the periphery of the weighing sensor (18), the screen plate (25) is in sliding sleeve connection with the assembly plate (17), and silica gel particles (26) are filled in the screen plate (25).
9. A weighbridge weighing support device according to claim 1, characterized in that the mounting plate (17) is fixedly provided with a heat dissipation fan (28) by a bracket (27), and the heat dissipation fan (28) is positioned at the right side of the weighing sensor (18).
10. A method of installing a weighbridge support device according to any one of claims 1-9, comprising the steps of: firstly, excavating a foundation, flattening and compacting an original soil layer, and paving a rigid waterproof layer (6); secondly, a reinforced concrete layer (4) is poured on the rigid waterproof layer (6), an embedded part (7) is embedded in the reinforced concrete when the reinforced concrete layer (4) is poured, and the top surface of the embedded part (7) is kept horizontal when the embedded part (7) is arranged; thirdly, after the concrete is solidified, spraying a hydrophobic layer (5) on the top of the reinforced concrete layer (4); fourthly, connecting and fixing the bottom frame (21), the inclined strut (22), the upper frame (23) and the reinforcing strut (24) by using a fixing bolt (15), and welding and reinforcing all contact points; fifthly, welding and fixing a second buffer spring (11) at the bottom of the buffer block (8), and sequentially installing a first buffer spring (10) and the buffer block (8) in a sliding cavity (9) in the embedded part (7); sixthly, installing a pressure ring (13) on the embedded part (7); step seven, mounting the assembled and welded support (3) on a buffer block (8), and then mounting an assembly plate (17), a rubber pad (19) and a weighing sensor (18) on the top of the support (3) by using a fixing bolt (15); step eight, installing a cooling fan (28) on the assembling plate (17), and fixing the screen plate (25) filled with the silica gel particles (26) at the bottom of the weighing platform (2) by using screws; and step nine, installing the weighing platform (2) above the weighing sensor (18).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011504471.8A CN112729503A (en) | 2020-12-18 | 2020-12-18 | Weighbridge weighing support device and mounting method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011504471.8A CN112729503A (en) | 2020-12-18 | 2020-12-18 | Weighbridge weighing support device and mounting method thereof |
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| Publication Number | Publication Date |
|---|---|
| CN112729503A true CN112729503A (en) | 2021-04-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011504471.8A Pending CN112729503A (en) | 2020-12-18 | 2020-12-18 | Weighbridge weighing support device and mounting method thereof |
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| CN (1) | CN112729503A (en) |
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Application publication date: 20210430 |
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