CN116117959A - Inorganic composite bamboo production process and composite bamboo - Google Patents

Inorganic composite bamboo production process and composite bamboo Download PDF

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Publication number
CN116117959A
CN116117959A CN202310076789.8A CN202310076789A CN116117959A CN 116117959 A CN116117959 A CN 116117959A CN 202310076789 A CN202310076789 A CN 202310076789A CN 116117959 A CN116117959 A CN 116117959A
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CN
China
Prior art keywords
bamboo
bundles
inorganic
adhesive
composite
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Pending
Application number
CN202310076789.8A
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Chinese (zh)
Inventor
张鑫
李树明
刘巧玲
赵而年
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Shandong Jiangu Special Engineering Limit
Shandong Jianzhu University Engineering Appraisal And Reinforcement Research Institute Co ltd
Shandong Jianzhu University
Original Assignee
Shandong Jiangu Special Engineering Limit
Shandong Jianzhu University Engineering Appraisal And Reinforcement Research Institute Co ltd
Shandong Jianzhu University
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Application filed by Shandong Jiangu Special Engineering Limit, Shandong Jianzhu University Engineering Appraisal And Reinforcement Research Institute Co ltd, Shandong Jianzhu University filed Critical Shandong Jiangu Special Engineering Limit
Priority to CN202310076789.8A priority Critical patent/CN116117959A/en
Publication of CN116117959A publication Critical patent/CN116117959A/en
Pending legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • B27N5/00—Manufacture of non-flat articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27L—REMOVING BARK OR VESTIGES OF BRANCHES; SPLITTING WOOD; MANUFACTURE OF VENEER, WOODEN STICKS, WOOD SHAVINGS, WOOD FIBRES OR WOOD POWDER
    • B27L11/00—Manufacture of wood shavings, chips, powder, or the like; Tools therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27M—WORKING OF WOOD NOT PROVIDED FOR IN SUBCLASSES B27B - B27L; MANUFACTURE OF SPECIFIC WOODEN ARTICLES
    • B27M1/00—Working of wood not provided for in subclasses B27B - B27L, e.g. by stretching
    • B27M1/06—Working of wood not provided for in subclasses B27B - B27L, e.g. by stretching by burning or charring, e.g. cutting with hot wire
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27M—WORKING OF WOOD NOT PROVIDED FOR IN SUBCLASSES B27B - B27L; MANUFACTURE OF SPECIFIC WOODEN ARTICLES
    • B27M1/00—Working of wood not provided for in subclasses B27B - B27L, e.g. by stretching
    • B27M1/08—Working of wood not provided for in subclasses B27B - B27L, e.g. by stretching by multi-step processes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • B27N1/00—Pretreatment of moulding material
    • B27N1/02—Mixing the material with binding agent
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • B27N1/00—Pretreatment of moulding material
    • B27N1/02—Mixing the material with binding agent
    • B27N1/029—Feeding; Proportioning; Controlling

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Chemical And Physical Treatments For Wood And The Like (AREA)

Abstract

The invention provides an inorganic composite bamboo production process and composite bamboo, which relate to the technical field of composite bamboo processes and aim at the problem that the quality of composite bamboo is poor due to poor bonding effect of inorganic adhesive and bamboo bundles in the conventional inorganic composite bamboo production process.

Description

Inorganic composite bamboo production process and composite bamboo
Technical Field
The invention relates to the technical field of composite bamboo technology, in particular to an inorganic composite bamboo production technology and composite bamboo.
Background
The development of the composite bamboo technology is one of effective ways for effectively utilizing bamboo resources, the bamboo industrialization technology and products are rapidly developed, however, the traditional composite bamboo still has the problems of poor water resistance, corrosion resistance, mildew resistance, fire resistance and light aging resistance, and in the production process of the composite bamboo, organic adhesives such as phenolic resin, urea resin and the like are mainly used as adhesives, so that the problem of formaldehyde release of the composite bamboo product is always caused. The series of defects limit the application range of the composite bamboo material and cause a certain air pollution problem
At present, the production of the composite bamboo is to bond bamboo bundles through organic glue, wrap the organic glue outside a plurality of bamboo and wood, then put the bamboo and wood into a die together for extrusion forming, and obtain the composite bamboo after solidification. However, the composite bamboo manufactured by using the organic adhesive as the adhesive has the problems of low strength, poor flame retardance and environmental protection, the existing market demands cannot be met, the composite bamboo obtained by using the inorganic adhesive has the advantages of high strength, strong flame retardance and no pollution, but the inorganic adhesive is used for producing the composite bamboo, so that the organic composite bamboo production equipment and the inorganic composite bamboo production equipment cannot be used generally, the inorganic adhesive and the bamboo bundles cannot be fully combined, the bonding degree between the adjacent bamboo bundles is poor, and the quality of the inorganic composite bamboo is affected.
Disclosure of Invention
The invention aims at overcoming the defects of the prior art, and provides an inorganic composite bamboo production process and composite bamboo, wherein after raw bamboo is pretreated to obtain bamboo bundles, the bamboo bundles are conveyed to spray inorganic adhesive, squeeze and immerse, enter a mould, vibrate and pressurize, and maintain, so that the inorganic adhesive and the bamboo bundles can be fully fused, the bonding degree of the bamboo bundles and the inorganic adhesive is improved, the compactness of the formed composite bamboo is increased, and the quality of the inorganic composite bamboo is ensured.
The first aim of the invention is to provide an inorganic composite bamboo production process, which adopts the following scheme:
pretreating raw bamboo to obtain bamboo bundles;
spraying inorganic adhesive to adhere to the bamboo bundles when the bamboo bundles are conveyed, and collecting the inorganic adhesive which is not adhered to the bamboo bundles to form an adhesive pool;
applying pressure to the bamboo bundles at the position of the adhesive pool to transversely expand the bamboo bundles, wherein the expanded positions are immersed in the adhesive pool;
the bamboo bundles passing through the adhesive pool carry inorganic adhesives into a die, the die is closed after the bamboo bundles are stacked to fill the die, and the die is subjected to compression molding;
and (3) carrying out primary curing on the molded bamboo bundles and the mold together, removing the mold after the primary curing is finished to obtain composite bamboo, and carrying out secondary curing on the composite bamboo.
Further, the pretreatment raw bamboo comprises:
splitting raw bamboo to obtain sheet materials, and rolling and fluffing the sheet materials to obtain netlike bamboo chips;
carbonizing and drying the netlike bamboo chips to obtain bamboo bundles.
Further, the obtained bamboo bundles are continuous along the length direction and intermittently separated along the direction perpendicular to the length direction.
Further, when the bamboo bundles are conveyed, the conveying surface is provided with inclined sections, the lowest points of the inclined sections form an adhesive pool, and inorganic adhesive is sprayed at the upstream position of the adhesive pool.
Further, the bamboo bundles are extruded from the upper part of the conveying surface, the bamboo bundles are bent under the extrusion action of the adhesive pool, the bending position is expanded transversely, and the inorganic adhesive enters a gap generated by the expansion of the transverse lines of the bamboo bundles.
Further, the sprayed inorganic adhesive is replenished to the adhesive pool, and the inorganic adhesive overflowed from the adhesive pool is recovered and supplied in a circulating manner.
Further, when the bamboo bundles are stacked in the mould, the bamboo bundles are stacked above the opening of the mould, and the bamboo bundles are fully filled in the mould by pressurizing, so that the bamboo bundles are densely filled.
Further, when the bamboo bundles carried by the die are pressurized, vibration is applied to discharge bubbles in the bamboo bundles and the inorganic adhesive.
Further, after the mold is closed by vibration and pressurization, it is loaded in both directions.
A second object of the present invention is to provide a composite bamboo obtained by using an inorganic composite bamboo production process as described in the first object.
Compared with the prior art, the invention has the advantages and positive effects that:
(1) The method aims at solving the problem that the quality of the composite bamboo is poor due to poor bonding effect of the inorganic adhesive and the bamboo bundles in the existing inorganic composite bamboo production, after the raw bamboo is pretreated to obtain the bamboo bundles, the bamboo bundles are conveyed to carry out the processes of spraying the inorganic adhesive, extruding and immersing, vibrating and pressurizing in a mold and maintaining, so that the inorganic adhesive and the bamboo bundles can be fully fused, the bonding degree of the bamboo bundles and the inorganic adhesive is improved, the compactness of the formed composite bamboo is increased, and the quality of the inorganic composite bamboo is ensured.
(2) The method adopts a mode of spraying the inorganic adhesive to the bamboo bundles in the conveying process to fuse, can acquire the inorganic adhesive which is uniformly mixed from a supply end in real time, and ensures the bonding effect of the inorganic adhesive.
(3) The bamboo bundles are extruded behind the inorganic adhesive spraying, so that the bamboo bundles are bent and transversely expanded, the degree of transverse intermittent separation of the bamboo bundles is increased, the inorganic adhesive can conveniently enter the transverse intermittent separation positions of the bamboo bundles, and full bond wrapping is realized; meanwhile, the inorganic adhesive forms a tiny inorganic adhesive pool at the extrusion position of the bamboo bundles, and the partial bamboo bundles which are transversely expanded after being extruded are soaked in the tiny inorganic adhesive pool, so that the inorganic adhesive in the tiny inorganic adhesive pool is promoted to enter into intermittent gaps which are transversely expanded by the bamboo bundles, and the fusion degree is improved.
(4) The inorganic adhesive is continuously sprayed, the micro inorganic adhesive pool is replenished, the micro inorganic adhesive pool is kept to be continuously updated, an overflow port is arranged on the micro inorganic adhesive pool, the inorganic adhesive overflowed from the overflow port is collected and flows back to the supply end, and the inorganic adhesive is mixed with a large amount of raw materials in the supply end for recycling.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention.
Fig. 1 is a schematic flow chart of the inorganic composite bamboo production process in examples 1 and 2 of the present invention.
Detailed Description
Example 1
In an exemplary embodiment of the present invention, as shown in fig. 1, an inorganic composite bamboo production process is provided.
At present, the production of the composite bamboo is to bond bamboo bundles through organic glue, wrap the organic glue outside a plurality of bamboo and wood, then put the bamboo and wood into a die together for extrusion forming, and obtain the composite bamboo after solidification. However, the composite bamboo manufactured by using the organic adhesive as the adhesive has low strength and poor flame retardance, and when the inorganic adhesive is used as the adhesive for producing the composite bamboo, more problems exist, and the organic composite bamboo production equipment and the inorganic composite bamboo production equipment cannot be used commonly, so that the inorganic adhesive and the bamboo bundles cannot be combined sufficiently, and the quality of the inorganic composite bamboo is affected.
Based on this, in the embodiment, an inorganic adhesive is output to the bamboo bundles in a spraying manner, and the bamboo bundles are extruded to enable the bamboo bundles to be soaked in an inorganic adhesive pool formed at an extrusion position, so that the inorganic adhesive forms a sufficient bond to the bamboo bundles, and the quality of the inorganic composite bamboo is improved.
Next, the production process of the inorganic composite bamboo in this embodiment will be described in detail with reference to the accompanying drawings.
Referring to fig. 1, the inorganic composite bamboo production process comprises the processes of pretreatment, conveying, inorganic adhesive spraying, molding and maintenance of raw bamboo.
The raw bamboo is pretreated to obtain bamboo bundles, and the bamboo bundles are conveyed to a position where inorganic adhesive is sprayed;
spraying inorganic adhesive to the bamboo bundles to fully fuse the bamboo bundles and the inorganic adhesive;
conveying the bamboo bundles with the inorganic adhesive to a mold position, and stacking the bamboo bundles according to the mold size;
after the bamboo bundles in the mould are stacked, closing the mould and vibrating and pressurizing the mould;
and (3) conveying the mould and the bamboo bundles into a curing room for curing, removing the mould after curing to obtain composite bamboo, conveying the composite bamboo into the curing room for curing again, and leaving a factory after curing.
The pretreatment of the raw bamboo comprises splitting, fluffing, carbonizing and drying, wherein the raw bamboo is split and fluffed into bamboo chips, and the bamboo chips are carbonized and dried to obtain bamboo bundles capable of being compounded with the inorganic adhesive.
In the embodiment, the raw bamboo is split to obtain a sheet material with the section size of about 30mm multiplied by 5mm, and the length of the obtained sheet material is consistent with that of the raw bamboo; rolling and fluffing the sheet material to obtain the net-shaped bamboo chips which are separated intermittently and longitudinally continuously, carbonizing the net-shaped bamboo chips and drying the net-shaped bamboo chips to obtain the bamboo bundles which can be used for production.
The inorganic adhesive is formed by mixing a plurality of raw materials such as magnesium oxide, magnesium sulfate and the like, and is formed into a suspension liquid state through a series of physical-chemical reactions; the inorganic binder in this embodiment may be as follows: inorganic gum in CN111303775B, CN115108804 a.
The bond uniformity of the inorganic adhesive to the bamboo bundles is a key factor influencing the performance of the composite bamboo, when the traditional organic adhesive is combined with the bamboo bundles, the bamboo bundles need to be immersed into an organic adhesive pool, the organic adhesive wraps the bamboo bundles from the outside, and then the organic adhesive is fished out or pulled out of the organic adhesive pool, but due to the lack of disturbance effect after the inorganic adhesive is injected into a container, components in the inorganic adhesive can be precipitated, so that the mixing of the components is uneven, and the bonding effect of the inorganic adhesive is influenced.
The inorganic binder used in this example is inconvenient to store in a large-volume tank, and the fusion of the inorganic binder and the bamboo bundles is difficult to be performed by treating the bamboo bundles in a conventional manner. In this regard, the fusion is carried out by spraying the inorganic adhesive onto the bamboo strands being transported, spraying the inorganic adhesive from above the strand transport station, with a portion of the inorganic adhesive adhering to the strand surface and a portion of the inorganic adhesive falling onto the transport apparatus surface. The inorganic adhesive which is uniformly mixed can be obtained from the supply end in real time by adopting a spraying mode, so that the bonding effect of the inorganic adhesive is ensured.
After spraying the inorganic adhesive to the bamboo bundles, the inorganic adhesive can only adhere to the surfaces of the bamboo bundles, and is difficult to enter transverse intermittent separation positions formed after fluffing. The raw bamboo is rolled in the bamboo bundle production process, and the bamboo splints at different positions in the rolling process are different in fluffing degree and heavier in fluffing, and the bamboo splints are decomposed into a plurality of bamboo splints, are less in transverse connection and are more easily wrapped by inorganic adhesive; the fluffing is light, the transverse connection is tight, the bonding of the inorganic adhesive is difficult, the fusion degree of the inorganic adhesive and the bamboo bundles is poor, and the bonding effect is affected.
In this regard, in this embodiment, the bundles are extruded behind the inorganic adhesive sprayed, so that the bundles are bent and spread in the transverse direction, which increases the degree of transverse intermittent separation of the bundles, and facilitates the inorganic adhesive to enter the transverse intermittent separation positions of the bundles.
Meanwhile, an inclined plane is arranged between the spraying position and the position for extruding the bamboo bundles, and the inorganic adhesive which is not adhered to the bamboo bundles gradually converges towards the extruding position along the inclined plane during spraying, so that a tiny inorganic adhesive pool is formed at the extruding position of the bamboo bundles by the inorganic adhesive, the partial bamboo bundles which are transversely expanded after being extruded are soaked in the tiny inorganic adhesive pool, the inorganic adhesive in the tiny inorganic adhesive pool is promoted to enter intermittent gaps which are transversely expanded by the bamboo bundles, and full bonding is realized.
On the premise of not damaging and breaking the bamboo bundles, the bamboo bundles are deformed, the transverse connection gap of the bamboo bundles is increased, and the inorganic adhesive can more smoothly enter the gaps of the bamboo bundles, so that the inorganic adhesive can fully bond the bamboo bundles.
When the bamboo bundles are conveyed, the inorganic adhesive is gathered into the micro inorganic adhesive pool, the micro inorganic adhesive pool is replenished along with continuous spraying of the inorganic adhesive, an overflow port is arranged on the micro inorganic adhesive pool for keeping continuous updating of the micro inorganic adhesive pool, and the inorganic adhesive overflowed from the overflow port is collected and flows back to a supply end and is recycled after being mixed with a large amount of raw materials in the supply end.
In this embodiment, the supply end may be a hopper, the inorganic adhesive is injected into the hopper, pumped to the upper part of the conveyor by the glue sprayer for spraying, the overflowed inorganic adhesive is recovered to the hopper, and the inorganic adhesive in the mixing hopper is supplied together for spraying.
As shown in fig. 1, the bamboo bundles are conveyed by a conveyor, and an inorganic adhesive is sprayed onto the bamboo bundles on the conveyor by a glue sprayer. After the bamboo bundles and the inorganic adhesive are fully wrapped and fused, the bamboo bundles and the inorganic adhesive are conveyed into a die. Because there are more gaps between the bamboo bundles when the bamboo bundles are stacked in the mould, before the mould is closed, the bamboo bundles are put in and piled up above the mould, the bamboo bundles are extruded by the top cover of the mould to continuously reduce the volume, and the air bubbles are discharged by combining the vibration action, so that all the bamboo bundles finally enter the mould, and the bamboo and wood in the mould are filled compactly. In the embodiment, the vibration frequency applied in the process of extruding the bamboo bundles by the top cover is 50Hz/s, the vibration loading is controlled to be 500-800 kg, and the vibration time is 6min.
After the bamboo bundles are filled into the mould, placing the bamboo bundles into a press machine for loading, so that the inorganic adhesive and the bamboo bundles are fully fused; and the bidirectional loading is adopted, and the loading is controlled at 3Mpa.
When carbonizing bamboo bundles, the required temperature is 150-180 ℃; the transmission rate of the conveyor is 2m/s, and the feeding of the bamboo bundles is controlled at 10-12cm 2 And (3) spraying the inorganic adhesive with the spraying amount of 12-15L/min by the adhesive spraying machine, wherein an adhesive receiving disc is arranged below the conveyor and is connected with a hopper of the adhesive spraying machine, and the recovered inorganic adhesive is recycled.
After the loading of the die is completed through a press machine, the die and the internal bamboo bundles are jointly transferred to a curing chamber for curing, after 20-24 hours of curing, the die is removed to obtain composite bamboo, and after 150 hours of curing, the composite bamboo can be subjected to corresponding post-treatment such as sawing.
Example 2
In another embodiment of the present invention, a composite bamboo is provided.
The composite bamboo is prepared by adopting the inorganic composite bamboo production process as in the embodiment 1, the flow of the inorganic composite bamboo production process is shown in fig. 1, and the composite bamboo is obtained and then processed to be used as a building material.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. The inorganic composite bamboo production process is characterized by comprising the following steps of:
pretreating raw bamboo to obtain bamboo bundles;
spraying inorganic adhesive to adhere to the bamboo bundles when the bamboo bundles are conveyed, and collecting the inorganic adhesive which is not adhered to the bamboo bundles to form an adhesive pool;
applying pressure to the bamboo bundles at the position of the adhesive pool to transversely expand the bamboo bundles, wherein the expanded positions are immersed in the adhesive pool;
the bamboo bundles passing through the adhesive pool carry inorganic adhesives into a die, the die is closed after the bamboo bundles are stacked to fill the die, and the die is subjected to compression molding;
and (3) carrying out primary curing on the molded bamboo bundles and the mold together, removing the mold after the primary curing is finished to obtain composite bamboo, and carrying out secondary curing on the composite bamboo.
2. The inorganic composite bamboo production process of claim 1, wherein the pretreatment raw bamboo comprises: splitting raw bamboo to obtain sheet materials, and rolling and fluffing the sheet materials to obtain netlike bamboo chips;
carbonizing and drying the netlike bamboo chips to obtain bamboo bundles.
3. The inorganic composite bamboo production process according to claim 2, wherein the obtained bamboo bundles are continuous in the length direction and intermittently separated in the direction perpendicular to the length direction.
4. The process for producing inorganic composite bamboo according to claim 1, wherein the conveying surface is provided with inclined sections, the lowest points of the inclined sections form an adhesive pool, and inorganic adhesive is sprayed at the upstream position of the adhesive pool when the bamboo bundles are conveyed.
5. The process of claim 4, wherein the strands are extruded from above the conveying surface and bent by the extrusion at the binder pool, the bending position being laterally expanded, and the inorganic binder entering the gaps created by the lateral line expansion of the strands.
6. The inorganic composite bamboo production process of claim 1, wherein the sprayed inorganic adhesive is replenished to the adhesive pool, and the inorganic adhesive overflowed from the adhesive pool is recovered for recycling.
7. The process for producing inorganic composite bamboo according to claim 1, wherein when the bamboo bundles are stacked in the mold, the bamboo bundles are stacked above the opening of the mold, and the bamboo bundles are filled and compacted by pressurizing to completely enter the mold.
8. The process of claim 7, wherein the vibration is applied to expel air bubbles from the bamboo strands and the inorganic binder when the bamboo strands carried by the mold are pressurized.
9. The inorganic composite bamboo production process of claim 8, wherein the mold is closed by vibration and pressurization, and then is loaded in both directions.
10. A composite bamboo obtained by the inorganic composite bamboo production process according to any one of claims 1 to 9.
CN202310076789.8A 2023-01-31 2023-01-31 Inorganic composite bamboo production process and composite bamboo Pending CN116117959A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310076789.8A CN116117959A (en) 2023-01-31 2023-01-31 Inorganic composite bamboo production process and composite bamboo

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310076789.8A CN116117959A (en) 2023-01-31 2023-01-31 Inorganic composite bamboo production process and composite bamboo

Publications (1)

Publication Number Publication Date
CN116117959A true CN116117959A (en) 2023-05-16

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Application Number Title Priority Date Filing Date
CN202310076789.8A Pending CN116117959A (en) 2023-01-31 2023-01-31 Inorganic composite bamboo production process and composite bamboo

Country Status (1)

Country Link
CN (1) CN116117959A (en)

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