CN114619544B - Clamp for temporary fixing of prefabricated concrete wallboard - Google Patents
Clamp for temporary fixing of prefabricated concrete wallboard Download PDFInfo
- Publication number
- CN114619544B CN114619544B CN202110704615.2A CN202110704615A CN114619544B CN 114619544 B CN114619544 B CN 114619544B CN 202110704615 A CN202110704615 A CN 202110704615A CN 114619544 B CN114619544 B CN 114619544B
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- block
- support pipe
- prefabricated concrete
- operating rod
- adjusting nut
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B7/00—Moulds; Cores; Mandrels
- B28B7/22—Moulds for making units for prefabricated buildings, i.e. units each comprising an important section of at least two limiting planes of a room or space, e.g. cells; Moulds for making prefabricated stair units
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B17/00—Details of, or accessories for, apparatus for shaping the material; Auxiliary measures taken in connection with such shaping
Abstract
The invention discloses a clamp for temporarily fixing a prefabricated concrete wallboard, which comprises a support pipe, a telescopic block, a first spring, an operating rod, an adjusting nut and a locking structure, wherein the telescopic block and the first spring are arranged inside the support pipe, the telescopic block is in sliding connection with the support pipe along the radial direction of the support pipe, the first spring is used for enabling the telescopic block to retract towards the inside of the support pipe, one end of the operating rod is arranged at the inner side of the support pipe, the operating rod is in sliding connection with the support pipe along the axial direction of the support pipe, a conical block is fixed on the operating rod, one end of the telescopic block is in contact with the conical block, the adjusting nut is sleeved at the outer side of the support pipe, the adjusting nut is in threaded connection with the support pipe, and one end of the operating rod arranged at the outer side of the support pipe is locked with the support pipe through the locking structure. The invention provides a fixture for temporarily fixing a prefabricated concrete wallboard, which is convenient to assemble and disassemble, and can be used for constructing only on one side of an adjusting nut by a worker during construction, so that the labor is saved, the efficiency is improved, and the safety accidents are reduced.
Description
Technical Field
The invention relates to the field of installation tools of electric prefabricated concrete wallboards, in particular to a clamp for temporarily fixing a prefabricated concrete wallboard.
Background
The reinforced concrete slab type component for building assembly, called wallboard or wallboard for short, is manufactured in a prefabrication factory (field) or a building site. The prefabricated concrete wallboard (prefabricated concrete wallboard) is adopted to construct the assembled large-plate building, so that the industrialized and mechanized construction degree can be improved, the site wet operation is reduced, the site labor is saved, the seasonal influence is overcome, and the building construction period is shortened. When the prefabricated concrete wallboard is installed on site, temporary fixing is needed, and after the formal connection between the prefabricated concrete wallboard and other structures is finished, the temporary fixing device is removed. The temporary fixing device of the prefabricated concrete wallboard in the prior art is inconvenient to assemble and disassemble, consumes labor, and needs to be fixed on the inner side and the outer side of the prefabricated concrete wallboard at the same time, so that certain danger exists. Therefore, it is necessary to design a fixture for temporary fixing of prefabricated concrete wall panels to solve the above-mentioned problems.
Chinese patent application publication number
CN210887602U, publication date is 2020, 30 months, entitled "quick connection structure of precast concrete wall panel and building main body", discloses a quick connection structure of precast concrete wall panel and building main body, it includes: prefabricating a concrete wallboard; a building main body including a building reinforcement cage and a building concrete layer; the connecting piece, it includes looks vertically first connecting plate and second connecting plate, and first connecting plate and second connecting plate constitute L shaped plate body structure, and first connecting plate fixed connection is on precast concrete wallboard, and second connecting plate fixed connection is in building reinforcement cage. But the problem of the temporary fixation of the concrete wallboard in case of accident is not solved by the quick connection structure.
Disclosure of Invention
The invention provides a fixture for temporarily fixing a precast concrete wallboard, which is convenient to assemble and disassemble, and can be used for saving personnel, raising the efficiency and reducing the safety accidents by only constructing on one side of an adjusting nut in order to overcome the defects that the temporary fixing device for the precast concrete wallboard in the prior art is inconvenient to assemble and disassemble, consumes labor and needs to be fixed on the inner side and the outer side of the precast concrete wallboard at the same time and has a certain danger.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the utility model provides a prefabricated concrete wallboard is fixture for temporary fixation, includes stay tube, flexible piece, first spring, action bars, adjusting nut and locking structure, flexible piece and first spring set up inside the stay tube, flexible piece is along the radial and stay tube sliding connection of stay tube, first spring is used for making flexible piece to the inside withdrawal of stay tube, the one end setting of action bars is inboard at the stay tube, the axial and stay tube sliding connection of action bars along the stay tube is fixed with the toper piece on the action bars, the one end and the toper piece contact of flexible piece, adjusting nut cover is established in the stay tube outside, adjusting nut and stay tube threaded connection, the one end of action bars setting in the stay tube outside is through locking structure and stay tube locking.
In the technical scheme, all parts are made of metal, so that the anti-damage capability is high, the anti-damage device can be used repeatedly, and the turnover use times are high. The end of the telescopic block, which is contacted with the supporting tube, can be an arc surface or an inclined surface which is matched with the conical surface of the conical block. The using method of the clamp in the technical scheme is as follows: 1. after the prefabricated concrete wallboard is installed in place, the supporting pipe extends into a fixing hole reserved in the concrete wallboard; 2. pressing the operating rod to enable the telescopic block to extend out of the supporting tube, and locking the supporting tube and the operating rod by utilizing the locking structure; 3. rotating the adjusting nut to tightly prop up the adjusting nut with the concrete wallboard; 4. the prefabricated wallboard is connected with a support frame through an external shaft (the support frame is fixed on a construction operation surface in advance), and the verticality of the prefabricated wallboard is adjusted to be within a range allowed by the specification by adjusting the support frame; 5. after the formal connection between the concrete wall and other structures is finished, the fixture is disassembled; 6. releasing the locking structure, pulling out the operating rod, and retracting the telescopic block into the supporting tube; drawing out the support tube from the concrete prefabricated hole; cleaning the surface of the fixture, checking the good condition, warehousing, reusing next time, and the like. The fixture has the beneficial effects that: can be repeatedly used, and has a plurality of turnover use times; during construction, personnel can only construct at one side of the adjusting nut, so that the personnel are saved, the efficiency is improved, the safety accidents are reduced, and the fixing advantage of the external wall panel is more obvious.
Preferably, the number of the telescopic blocks is two, the two telescopic blocks are symmetrically arranged relative to the axis of the supporting tube, and two ends of the first spring are respectively connected with the two telescopic blocks. The extension structure of the telescopic block is more stable, and the prefabricated concrete wall is more reliably fixed.
Preferably, the telescopic block and the adjusting nut are respectively close to two ends of the supporting tube. The structure enables the telescopic blocks and the adjusting nuts to clamp the prefabricated concrete wall.
Preferably, an external shaft is arranged at one end of the supporting tube, which is close to the adjusting nut. The external shaft is convenient for the supporting tube to be connected with an external structure.
Preferably, the locking structure comprises a hanging chain, a hanging buckle is arranged on the supporting tube, one end of the hanging chain is connected with the operating rod, and the other end of the hanging chain is clamped with the hanging buckle. The hanging chain can limit the position of the operating rod after the conical block ejects the telescopic block, so that the telescopic block is prevented from retracting.
Preferably, the catenary has elasticity.
Preferably, the locking structure comprises a locking block and a second spring, a locking ring groove is formed in the operating rod, the locking block is slidably connected with the supporting tube, the two ends of the second spring are respectively connected with the locking block and the supporting tube, and when the telescopic block stretches out, one end of the locking block stretches into the locking ring groove. The hanging chain can limit the position of the operating rod after the conical block ejects the telescopic block, so that the telescopic block is prevented from retracting.
Preferably, a plurality of guide rings are arranged on the inner side wall of the support tube, and the operating rod is connected with the support tube in a sliding manner through the guide rings. The structure can play a guiding role on the operation rod.
Preferably, a baffle is arranged on the operating rod, and the baffle is contacted with the guide ring when the telescopic block stretches out. The shutter may restrict displacement of the lever.
Preferably, a handle is arranged at one end of the operating rod arranged outside the supporting tube. The handle facilitates movement of the lever.
Preferably, an inner sealing head is arranged at the end part of the support tube, which is close to the telescopic block. The end of the supporting tube can be sealed by the inner sealing head, so that sundries are prevented from entering.
Preferably, the telescopic block is provided with an anti-falling mechanism, the anti-falling mechanism comprises a sliding block and a telescopic spring, a sliding hole is formed in the side wall of the telescopic block, the sliding block and the telescopic spring are arranged in the sliding hole, the sliding block is in sliding connection with the telescopic block, one end of the telescopic spring is connected with the sliding block, the other end of the telescopic spring is connected with the telescopic block, a through groove for the sliding block to pass through is formed in the side wall of the supporting tube, and the through groove is arranged between the telescopic block and the adjusting nut; when the telescopic block is not contacted with the prefabricated concrete wallboard, the sliding block extends out of the sliding hole towards the direction of the adjusting nut; when the telescopic block clamps the prefabricated concrete wallboard, the sliding block extends out of the sliding hole in a direction away from the adjusting nut.
According to the technical scheme, the axial direction of the sliding hole is approximately parallel to the axial direction of the supporting tube, the anti-falling mechanism enables the telescopic block to be unable to retract when the telescopic block and the adjusting nut clamp the prefabricated concrete wall, and the telescopic block is prevented from retracting due to the fact that the telescopic block is carelessly touched with the locking structure in the temporary fixing process when the telescopic block is kept in the extending state. When the telescopic block does not stretch out, when the telescopic block does not contact the prefabricated concrete wallboard, because the telescopic block can stretch out under the action of the conical block and can also reversely retract through the groove, when the adjusting nut is screwed down, the sliding block is extruded when the telescopic block and the adjusting nut clamp the prefabricated concrete wallboard, slides in the direction away from the adjusting nut and stretches out the sliding hole, after the sliding block reversely stretches out the sliding hole, the telescopic block cannot retract into the supporting tube, only after temporary fixing is finished, the adjusting nut is loosened, the sliding block returns to the initial position, and the telescopic block can retract.
The beneficial effects of the invention are as follows: the fixture can be repeatedly used, and the turnover use times are more; (2) During construction, a worker can only construct at one side of the adjusting nut, so that the labor is saved, the efficiency is improved, the safety accidents are reduced, and the fixing advantage of the external wall panel is more obvious; (3) The anti-drop mechanism can not retract the telescopic block when the telescopic block and the adjusting nut clamp the prefabricated concrete wall, and the telescopic block is prevented from retracting due to the fact that the telescopic block is carelessly touched with the locking structure in the temporary fixing process when the telescopic block is kept in an extending state.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
fig. 2 is a schematic structural view of embodiment 2;
fig. 3 is a schematic structural view of embodiment 4.
In the figure: the support tube 1, the guide ring 1.1, the through groove 1.2, the telescopic block 2, the sliding hole 2.1, the first spring 3, the operating rod 4, the locking ring groove 4.1, the baffle 4.2, the handle 4.3, the adjusting nut 5, the locking structure 6, the hanging chain 6.1, the locking block 6.2, the second spring 6.3, the conical block 7, the external shaft 8, the hanging buckle 10, the inner sealing head 11, the anti-disengaging mechanism 12, the sliding block 12.1 and the telescopic spring 12.2.
Detailed Description
The invention is further described below with reference to the drawings and specific embodiments.
Example 1:
as shown in FIG. 1, a fixture for temporary fixation of precast concrete wallboard, including stay tube 1, two flexible pieces 2, first spring 3, action bars 4, adjusting nut 5 and locking structure 6, flexible piece 2 and first spring 3 set up inside stay tube 1, flexible piece 2 along the radial and stay tube 1 sliding connection of stay tube 1, two flexible pieces 2 set up with the axis symmetry of stay tube 1 relatively, two flexible pieces 2 are connected respectively at the both ends of first spring 3, first spring 3 is used for making flexible piece 2 retract to stay tube 1 inside, the one end setting of action bars 4 is inboard at stay tube 1, be equipped with a plurality of guide ring 1.1 on the inside wall of stay tube 1, action bars 4 pass through guide ring 1.1 and stay tube 1 sliding connection. The operation rod 4 is fixedly provided with a conical block 7, one end of the telescopic block 2 is in contact with the conical block 7, the adjusting nut 5 is sleeved outside the support tube 1, the adjusting nut 5 is in threaded connection with the support tube 1, and one end of the operation rod 4 arranged outside the support tube 1 is locked with the support tube 1 through a locking structure 6. The telescopic block 2 and the adjusting nut 5 are respectively close to the two ends of the support tube 1. An external shaft 8 is fixed at one end of the support tube 1 close to the adjusting nut 5. One end of the operating rod 4 arranged outside the supporting tube 1 is provided with a handle 4.3. An inner sealing head 11 is arranged at the end part of the supporting tube 1, which is close to the telescopic block 2.
In the technical scheme, all parts are made of metal, so that the anti-damage capability is high, the anti-damage device can be used repeatedly, and the turnover use times are high. The end of the telescopic block 2 contacted with the supporting tube 1 can be an arc surface or an inclined surface matched with the conical surface of the conical block 7. The using method of the clamp in the technical scheme is as follows: 1. after the prefabricated concrete wallboard is installed in place, the supporting pipe 1 extends into a fixed hole reserved in the concrete wallboard; 2. pressing the operating rod 4 to enable the telescopic block 2 to extend out of the supporting tube 1, and locking the supporting tube 1 and the operating rod 4 by utilizing the locking structure 6; 3. rotating the adjusting nut 5 to tightly prop up the adjusting nut 5 with the concrete wallboard; 4. the prefabricated wallboard is connected with a support frame through an external shaft 8 (the support frame is fixed on a construction operation surface in advance), and the verticality of the prefabricated wallboard is adjusted to be within a range allowed by the specification by adjusting the support frame; 5. after the formal connection between the concrete wall and other structures is finished, the fixture is disassembled; 6. releasing the locking structure 6, pulling out the operating rod 4, and retracting the telescopic block 2 into the support tube 1; drawing out the support tube 1 from the concrete prefabricated hole; cleaning the surface of the fixture, checking the good condition, warehousing, reusing next time, and the like. The fixture has the beneficial effects that: can be repeatedly used, and has a plurality of turnover use times; during construction, personnel can only construct on one side of the adjusting nut 5, so that the personnel are saved, the efficiency is improved, the safety accidents are reduced, and the fixing advantage of the external wall panel is more obvious.
Example 2:
as shown in fig. 2, on the basis of embodiment 1, the locking structure 6 includes a hanging chain 6.1, a hanging buckle 10 is disposed on the supporting tube 1, one end of the hanging chain 6.1 is connected with the operating rod 4, and the other end of the hanging chain 6.1 is clamped with the hanging buckle 10. The hanging chain 6.1 can limit the position of the operating rod 4 after the conical block 7 ejects the telescopic block 2, so as to avoid the telescopic block 2 from retracting.
Example 3:
as shown in fig. 1, on the basis of embodiment 1, the locking structure 6 includes a locking block 6.2 and a second spring 6.3, a locking ring groove 4.1 is provided on the operating rod 4, the locking block 6.2 is slidably connected with the support tube 1, two ends of the second spring 6.3 are respectively connected with the locking block 6.2 and the support tube 1, and when the telescopic block 2 stretches out, one end of the locking block 6.2 stretches into the locking ring groove 4.1. The hanging chain 6.1 can limit the position of the operating rod 4 after the conical block 7 ejects the telescopic block 2, so as to avoid the telescopic block 2 from retracting.
Example 4:
as shown in fig. 3, on the basis of embodiment 1, an anti-disengaging mechanism 12 is disposed on the telescopic block 2, the anti-disengaging mechanism 12 includes a sliding block 12.1 and a telescopic spring 12.2, a sliding hole 2.1 is disposed on a side wall of the telescopic block 2, an axial direction of the sliding hole 2.1 is parallel to an axial direction of the supporting tube 1, the sliding block 12.1 and the telescopic spring 12.2 are disposed in the sliding hole 2.1, the sliding block 12.1 is slidably connected with the telescopic block 2 along the axial direction of the sliding hole 2.1, one end of the telescopic spring 12.2 is connected with the sliding block 12.1, the other end of the telescopic spring 12.2 is connected with the telescopic block 2, a through groove 1.2 for allowing the sliding block 12.1 to pass is disposed on the side wall of the supporting tube 1, and the through groove 1.2 is disposed between the telescopic block 2 and the adjusting nut 5; when the telescopic block 2 is not contacted with the prefabricated concrete wallboard, the sliding block 12.1 extends out of the sliding hole 2.1 towards the direction of the adjusting nut 5; when the telescopic block 2 clamps the prefabricated concrete wallboard, the sliding block 12.1 extends out of the sliding hole 2.1 in a direction away from the adjusting nut 5.
In the above technical scheme, the axial direction of the sliding hole 2.1 is approximately parallel to the axial direction of the supporting tube 1, and the anti-disengaging mechanism 12 and the telescopic block 2 cannot retract when the telescopic block 2 and the adjusting nut 5 clamp the prefabricated concrete wall, so that the telescopic block 2 cannot retract, and the situation that the telescopic block 2 retracts due to careless contact with the locking structure 6 in the temporary fixing process is avoided when the telescopic block is kept in an extending state. When the telescopic block 2 does not extend, the telescopic block 2 does not contact the prefabricated concrete wallboard, because the telescopic block 2 can extend under the action of the conical block 7 and can also retract reversely due to the existence of the groove 1.2, when the adjusting nut 5 is screwed down, the sliding block 12.1 is extruded to slide in the direction away from the adjusting nut 5 and extend out of the sliding hole 2.1 when the telescopic block 2 and the adjusting nut 5 clamp the prefabricated concrete wallboard, after the sliding block 12.1 reversely extends out of the sliding hole 2.1, the telescopic block 2 cannot retract into the supporting tube 1, and only after temporary fixation is completed, the adjusting nut 5 is loosened, the sliding block 12.1 returns to the initial position, and the telescopic block 2 can be retracted.
The beneficial effects of the invention are as follows: the fixture can be repeatedly used, and the turnover use times are more; (2) During construction, a worker can only construct at one side of the adjusting nut 5, so that the labor is saved, the efficiency is improved, the safety accidents are reduced, and the fixing advantage of the external wall panel is more obvious; (3) The anti-disengaging mechanism 12 can not retract the telescopic block 2 when the telescopic block 2 and the adjusting nut 5 clamp the prefabricated concrete wall, and the telescopic block 2 is prevented from retracting due to careless contact with the locking structure 6 in the temporary fixing process when the telescopic block 2 is kept in an extending state.
Claims (10)
1. The clamp for temporarily fixing the prefabricated concrete wallboard is characterized by comprising a support pipe, a telescopic block, a first spring, an operating rod, an adjusting nut and a locking structure, wherein the telescopic block and the first spring are arranged inside the support pipe, the telescopic block is in sliding connection with the support pipe along the radial direction of the support pipe, the first spring is used for enabling the telescopic block to retract towards the support pipe, one end of the operating rod is arranged on the inner side of the support pipe, the operating rod is in sliding connection with the support pipe along the axial direction of the support pipe, a conical block is fixed on the operating rod, one end of the telescopic block is in contact with the conical block, the adjusting nut is sleeved on the outer side of the support pipe, the adjusting nut is in threaded connection with the support pipe, and one end of the operating rod arranged on the outer side of the support pipe is locked with the support pipe through the locking structure;
be equipped with anticreep mechanism on the flexible piece, the anticreep mechanism includes sliding block and expansion spring, is equipped with the slide opening on the lateral wall of flexible piece, and sliding block and expansion spring set up in the slide opening, sliding block and flexible piece sliding connection, and expansion spring one end is connected with the sliding block, and the other end and the flexible piece of expansion spring are connected, are equipped with the through groove that is used for making the sliding block pass through on the lateral wall of stay tube, pass through the groove setting between flexible piece and adjusting nut.
2. The fixture for temporary fixing of prefabricated concrete wall panels according to claim 1, wherein the number of the telescopic blocks is two, the two telescopic blocks are symmetrically arranged relative to the axis of the supporting tube, and two ends of the first spring are respectively connected with the two telescopic blocks.
3. The fixture for temporary fixing of prefabricated concrete wall panels according to claim 1, wherein the telescopic blocks and the adjusting nuts are respectively adjacent to both ends of the support pipe.
4. The fixture for temporary fixing of prefabricated concrete wall panels according to claim 1, wherein an external shaft is arranged at one end of the support tube, which is close to the adjusting nut.
5. The fixture for temporarily fixing a prefabricated concrete wall panel according to claim 1, 2, 3 or 4, wherein the locking structure comprises a hanging chain, a hanging buckle is arranged on the supporting tube, one end of the hanging chain is connected with the operating rod, and the other end of the hanging chain is clamped with the hanging buckle.
6. The fixture for temporary fixing of prefabricated concrete wall panels according to claim 5, wherein said hanging chain has elasticity.
7. The fixture for temporary fixing of prefabricated concrete wall panels according to claim 1, 2, 3 or 4, wherein the locking structure comprises a locking block and a second spring, a locking ring groove is arranged on the operating rod, the locking block is slidably connected with the support tube, two ends of the second spring are respectively connected with the locking block and the support tube, and one end of the locking block stretches into the locking ring groove when the telescopic block stretches out.
8. The fixture for temporary fixing of prefabricated concrete wall panels according to claim 1, 2, 3 or 4, wherein a plurality of guide rings are arranged on the inner side wall of the support tube, and the operating rod is slidably connected with the support tube through the guide rings.
9. The fixture for temporarily fixing a prefabricated concrete wall panel according to claim 1, 2, 3 or 4, wherein a handle is provided at one end of the operating rod disposed outside the support tube.
10. The fixture for temporarily fixing a prefabricated concrete wall panel according to claim 1, 2, 3 or 4, wherein the sliding block extends out of the sliding hole toward the adjusting nut when the telescopic block is not in contact with the prefabricated concrete wall panel; when the telescopic block clamps the prefabricated concrete wallboard, the sliding block extends out of the sliding hole in a direction away from the adjusting nut.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110704615.2A CN114619544B (en) | 2021-06-24 | 2021-06-24 | Clamp for temporary fixing of prefabricated concrete wallboard |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110704615.2A CN114619544B (en) | 2021-06-24 | 2021-06-24 | Clamp for temporary fixing of prefabricated concrete wallboard |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114619544A CN114619544A (en) | 2022-06-14 |
| CN114619544B true CN114619544B (en) | 2023-06-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110704615.2A Active CN114619544B (en) | 2021-06-24 | 2021-06-24 | Clamp for temporary fixing of prefabricated concrete wallboard |
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| CN (1) | CN114619544B (en) |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN206047438U (en) * | 2016-08-26 | 2017-03-29 | 浙江德昱汽车零部件有限公司 | The tight device of work piece positioning |
| CN209831425U (en) * | 2019-04-28 | 2019-12-24 | 赵梦祥 | Quick batch clamping device of annular workpiece for industrial engineering |
| CN210756559U (en) * | 2019-11-05 | 2020-06-16 | 中信戴卡股份有限公司 | Adjustable mandrel and clamp |
| CN110682133A (en) * | 2019-11-05 | 2020-01-14 | 中信戴卡股份有限公司 | Adjustable mandrel and clamp |
| CN217000982U (en) * | 2021-06-24 | 2022-07-19 | 新疆苏中建设工程有限公司 | Prefabricated concrete wallboard is fixture for temporary fixation |
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2021
- 2021-06-24 CN CN202110704615.2A patent/CN114619544B/en active Active
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