CN104493918B - The preparation method of preformed curvature integrated timber - Google Patents

The preparation method of preformed curvature integrated timber Download PDF

Info

Publication number
CN104493918B
CN104493918B CN201410773520.6A CN201410773520A CN104493918B CN 104493918 B CN104493918 B CN 104493918B CN 201410773520 A CN201410773520 A CN 201410773520A CN 104493918 B CN104493918 B CN 104493918B
Authority
CN
China
Prior art keywords
curvature
described
integrated timber
radius
preformed
Prior art date
Application number
CN201410773520.6A
Other languages
Chinese (zh)
Other versions
CN104493918A (en
Inventor
朱旭东
高颖
吴玉璇
董伟博
郭兆霞
袁廷阁
丁青锋
龚馨圆
Original Assignee
北京林业大学
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 北京林业大学 filed Critical 北京林业大学
Priority to CN201410773520.6A priority Critical patent/CN104493918B/en
Publication of CN104493918A publication Critical patent/CN104493918A/en
Application granted granted Critical
Publication of CN104493918B publication Critical patent/CN104493918B/en

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B27WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27DWORKING VENEER OR PLYWOOD
    • B27D1/00Joining wood veneer with any material; Forming articles thereby; Preparatory processing of surfaces to be joined, e.g. scoring
    • B27D1/10Butting blanks of veneer; Joining same along edges; Preparatory processing of edges, e.g. cutting
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B27WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27HBENDING WOOD OR SIMILAR MATERIAL; COOPERAGE; MAKING WHEELS FROM WOOD OR SIMILAR MATERIAL
    • B27H1/00Bending wood stock, e.g. boards

Abstract

The invention discloses a kind of preparation method of preformed curvature integrated timber, the preparation method of described preformed curvature integrated timber comprises the following steps: provide multiple plank with predetermined thickness; By the longitudinal finger between two of the part in multiple plank; Measure the maximum degree of disturbing of elastic stage of multiple laminate, and calculate the flexible minimum profile curvature radius of laminate; Multiple laminate is utilized to be processed into multiple processing radius of curvature preformed curvature integrated timber different from each other; Multiple preformed curvature integrated timber is placed to multiple preformed curvature integrated timber no longer deform, then measures the actual curvature radius of multiple preformed curvature integrated timber, then set up actual curvature radius and relation curve and the functional relation of processing radius of curvature; Radius of curvature according to actual needs, calculates processing radius of curvature by functional relation, and processing obtains the preformed curvature integrated timber with corresponding processing radius of curvature.Preparation method simple possible, the enforcement of described preformed curvature integrated timber are convenient.

Description

The preparation method of preformed curvature integrated timber

Technical field

The present invention relates to a kind of preparation method of preformed curvature integrated timber.

Background technology

With the development of timber buildings industry in China, heavy timber construction building enters the life of compatriots, and there is a large amount of bending integrated timber buildings to occur, comprise large public building and timber structure bridge etc., this type of widely applies bending integrated timber in building, and bending integrated timber designs, production all has certain difficulty.After bending integrated timber machines, usually can deform, resilience etc., cause engineering site to use.

Summary of the invention

The present invention is intended to solve one of technical problem in correlation technique at least to a certain extent.For this reason, the present invention proposes a kind of preparation method of preformed curvature integrated timber.

Preparation method according to the preformed curvature integrated timber of the embodiment of the present invention comprises the following steps: provide multiple plank with predetermined thickness; By the part in multiple described plank, longitudinal finger is to obtain multiple finger laminate between two, and each of the remainder in multiple described plank is non-finger laminate, and wherein said finger laminate and described non-finger laminate are referred to as laminate; Multiple described laminate was placed for first scheduled time, measures the elastic stage maximum defluxion of each in multiple described laminate, and choose the flexible minimum profile curvature radius of the 3%-10% tantile under 75%-90% confidential interval as described laminate; Multiple described laminate is utilized to be processed into multiple preformed curvature integrated timber, the processing radius of curvature of multiple described preformed curvature integrated timber is different from each other, described in one of them, the processing radius of curvature of preformed curvature integrated timber equals described laminate minimum profile curvature radius, and described in all the other, the processing radius of curvature of preformed curvature integrated timber is greater than described minimum profile curvature radius; Multiple described preformed curvature integrated timber was placed for second scheduled time, until multiple described preformed curvature integrated timber no longer deforms, then measure the actual curvature radius of multiple described preformed curvature integrated timber, then set up relation curve and the functional relation of described actual curvature radius and described processing radius of curvature; According to the radius of curvature of engineering site actual needs, calculate processing radius of curvature by described functional relation, processing obtains the preformed curvature integrated timber with corresponding processing radius of curvature.

According to the preparation method simple possible of the preformed curvature integrated timber of the embodiment of the present invention, implement convenient, with low cost, solve the design of preformed curvature integrated timber, a processing difficult problem, avoid engineering site to occur underproof preformed curvature integrated timber.

In addition, the preparation method of preformed curvature integrated timber according to the above embodiment of the present invention can also have following additional technical characteristic:

According to one embodiment of present invention, multiple described laminate by adhesive bonds together, is then processed into described preformed curvature integrated timber by bending mould or press.

According to one embodiment of present invention, described adhesive is selected from one or more in isocyanate adhesive, resorcinol adhesive, epoxyn and polyurethane adhesive.

According to one embodiment of present invention, described first scheduled time is 2 hours-4 hours, and described second scheduled time is 72 hours-120 hours.

According to one embodiment of present invention, multiple described preformed curvature integrated timber temperature be 20 degrees Celsius-30 degrees Celsius, relative humidity places described second scheduled time under being the environment of 55%-65%.

According to one embodiment of present invention, the length of described plank is 25 times-30 times of the thickness of described plank.

According to one embodiment of present invention, the flexible minimum profile curvature radius of 5% tantile under 75% confidential interval as described laminate is chosen.

According to one embodiment of present invention, multiple described laminate temperature be 70 degrees Celsius-90 degrees Celsius, relative humidity places described first scheduled time under being the environment of 100%, then measures the elastic stage maximum defluxion of each in multiple described laminate.

According to one embodiment of present invention, be 70 degrees Celsius-90 degrees Celsius in temperature, under relative humidity is the environment of 100%, utilize described laminate to be processed into multiple described preformed curvature integrated timber.

Accompanying drawing explanation

Fig. 1 is the flow chart of the preparation method of preformed curvature integrated timber according to the embodiment of the present invention.

Detailed description of the invention

Be described below in detail embodiments of the invention, the example of described embodiment is shown in the drawings.Be exemplary below by the embodiment be described with reference to the drawings, be intended to for explaining the present invention, and can not limitation of the present invention be interpreted as.

Below with reference to the accompanying drawings the preparation method of the preformed curvature integrated timber according to the embodiment of the present invention is described.As shown in Figure 1, comprise the following steps according to the preparation method of the preformed curvature integrated timber of the embodiment of the present invention:

Multiple plank with predetermined thickness is provided;

By the part in multiple described plank, longitudinal finger is to obtain multiple finger laminate between two, and each of the remainder in multiple described plank is non-finger laminate, and wherein said finger laminate and described non-finger laminate are referred to as laminate;

Multiple described laminate was placed for first scheduled time, measures the elastic stage maximum defluxion of each in multiple described laminate, and choose the flexible minimum profile curvature radius of the 3%-10% tantile under 75%-90% confidential interval as described laminate;

Multiple described laminate is utilized to be processed into multiple preformed curvature integrated timber, the processing radius of curvature of multiple described preformed curvature integrated timber is different from each other, described in one of them, the processing radius of curvature of preformed curvature integrated timber equals described laminate minimum profile curvature radius, and described in all the other, the processing radius of curvature of preformed curvature integrated timber is greater than described minimum profile curvature radius;

Multiple described preformed curvature integrated timber was placed for second scheduled time, until multiple described preformed curvature integrated timber no longer deforms, then measure the actual curvature radius of multiple described preformed curvature integrated timber, then set up relation curve and the functional relation of described actual curvature radius and described processing radius of curvature;

According to the radius of curvature of engineering site actual needs, calculate processing radius of curvature by described functional relation, processing obtains the preformed curvature integrated timber with corresponding processing radius of curvature.

According to the preparation method of the preformed curvature integrated timber of the embodiment of the present invention by setting up relation curve and the functional relation of described actual curvature radius and described processing radius of curvature, thus processing radius of curvature can be calculated according to the radius of curvature of engineering site actual needs by described functional relation.Can process the preformed curvature integrated timber obtaining having corresponding processing radius of curvature thus, this preformed curvature integrated timber is deforming, after resilience, and its radius of curvature is the radius of curvature of actual needs just.

Therefore, according to the preparation method simple possible of the preformed curvature integrated timber of the embodiment of the present invention, implement convenient, with low cost, solve the design of preformed curvature integrated timber, a processing difficult problem, avoid engineering site to occur underproof preformed curvature integrated timber.

And, utilize the physical and mechanical property of the preformed curvature integrated timber produced according to the preparation method of the preformed curvature integrated timber of the embodiment of the present invention to meet or exceed the requirement of GB/T26899-2011 (structural glulam), there is good economic benefit and environmental benefit.

In some embodiments of the invention, the plank with predetermined thickness used according to the preparation method of the preformed curvature integrated timber of the embodiment of the present invention can select the plank that knaur is few and little.

Preferably, the length of described plank is 25 times-30 times of the thickness of described plank.Further preferably, the length of described plank is 25 times of the thickness of described plank.

Such as, provide 300 planks with predetermined thickness, wherein will carry out Lengthwise joint between two by finger, to form the finger laminate of 100 stack piles by 200 planks.Remaining 100 planks are non-finger laminate, and described finger laminate and described non-finger laminate are referred to as laminate.That is, described laminate is 200.

Adopt the elastic stage maximum defluxion of laminate described in mechanical test machine testing, amount to 200 groups of data.Then, the flexible minimum profile curvature radius of the 3%-10% tantile under 75%-90% confidential interval as described laminate is chosen.

Preferably, the flexible minimum profile curvature radius of 5% tantile under 75% confidential interval as described laminate is chosen.

In one embodiment of the invention, multiple described laminate temperature be 70 degrees Celsius-90 degrees Celsius, relative humidity placed for first scheduled time under being the environment of 100%, then measured the elastic stage maximum defluxion of each in multiple described laminate.

By by multiple described laminate temperature be 70 degrees Celsius-90 degrees Celsius, relative humidity placed for first scheduled time under being the environment of 100%, thus timber can be made to soften and make the composition transfer of timber, thus be conducive to carrying out bending machining to described laminate and shaping.

Preferably, multiple described laminate is being 70 degrees Celsius-90 degrees Celsius in temperature, after relative humidity placed for first scheduled time under being the environment of 100%, is measuring rapidly the elastic stage maximum defluxion of each in multiple described laminate.

Preferably, described first scheduled time is 2 hours-4 hours.Further preferably, described first scheduled time is 3 hours.

By adhesive, multiple described laminate is bonded together, is then processed into preformed curvature integrated timber by bending mould or press.Wherein, described adhesive is selected from one or more in isocyanate adhesive, resorcinol adhesive, epoxyn and polyurethane adhesive.

Advantageously, be 70 degrees Celsius-90 degrees Celsius in temperature, under relative humidity is the environment of 100%, utilize multiple described laminate to be processed into multiple described preformed curvature integrated timber.Timber can be made thus to soften and make the composition transfer of timber, thus be conducive to carrying out bending machining to described laminate and shaping.

The processing radius of curvature of multiple described preformed curvature integrated timber is different from each other, described in one of them, the processing radius of curvature of preformed curvature integrated timber equals described laminate minimum profile curvature radius, and described in all the other, the processing radius of curvature of preformed curvature integrated timber is greater than described minimum profile curvature radius.

The processing radius of curvature of described preformed curvature integrated timber refers to the radius of curvature of the described preformed curvature integrated timber after processing, and now described preformed curvature integrated timber does not also deform.After processing obtains described preformed curvature integrated timber, the radius of curvature of described preformed curvature integrated timber can be measured immediately to obtain the processing radius of curvature of described preformed curvature integrated timber.

By multiple described preformed curvature integrated timber temperature be 20 degrees Celsius-30 degrees Celsius, relative humidity be the environment of 55%-65% under place 72 hours-120 hours, until multiple described preformed curvature integrated timber no longer deforms.

Preferably, by multiple described preformed curvature integrated timber temperature be 25 degrees Celsius, relative humidity be the environment of 60% under place 96 hours, until multiple described preformed curvature integrated timber no longer deforms.

After described preformed curvature integrated timber no longer deforms, measure the actual curvature radius of multiple described preformed curvature integrated timber, then set up relation curve and the functional relation of described actual curvature radius and described processing radius of curvature.

According to the radius of curvature of engineering site actual needs, calculate processing radius of curvature by described functional relation, processing obtains the preformed curvature integrated timber with corresponding processing radius of curvature.

The thickness of described plank and the assortment of described plank can also be changed, repeat above-mentioned steps, to process corresponding preformed curvature integrated timber.

In describing the invention, it will be appreciated that, term " " center ", " longitudinal direction ", " transverse direction ", " length ", " width ", " thickness ", " on ", D score, " front ", " afterwards ", " left side ", " right side ", " vertically ", " level ", " top ", " end " " interior ", " outward ", " clockwise ", " counterclockwise ", " axis ", " radial direction ", orientation or the position relationship of the instruction such as " circumference " are based on orientation shown in the drawings or position relationship, only the present invention for convenience of description and simplified characterization, instead of indicate or imply that the device of indication or element must have specific orientation, with specific azimuth configuration and operation, therefore limitation of the present invention can not be interpreted as.

In addition, term " first ", " second " only for describing object, and can not be interpreted as instruction or hint relative importance or imply the quantity indicating indicated technical characteristic.Thus, be limited with " first ", the feature of " second " can express or impliedly comprise at least one this feature.In describing the invention, the implication of " multiple " is at least two, such as two, three etc., unless otherwise expressly limited specifically.

In the present invention, unless otherwise clearly defined and limited, the term such as term " installation ", " being connected ", " connection ", " fixing " should be interpreted broadly, and such as, can be fixedly connected with, also can be removably connect, or integral; Can be mechanical connection, also can be electrical connection or each other can communication; Can be directly be connected, also indirectly can be connected by intermediary, can be the connection of two element internals or the interaction relationship of two elements, unless otherwise clear and definite restriction.For the ordinary skill in the art, above-mentioned term concrete meaning in the present invention can be understood as the case may be.

In the present invention, unless otherwise clearly defined and limited, fisrt feature second feature " on " or D score can be that the first and second features directly contact, or the first and second features are by intermediary mediate contact.And, fisrt feature second feature " on ", " top " and " above " but fisrt feature directly over second feature or oblique upper, or only represent that fisrt feature level height is higher than second feature.Fisrt feature second feature " under ", " below " and " below " can be fisrt feature immediately below second feature or tiltedly below, or only represent that fisrt feature level height is less than second feature.

In the description of this description, specific features, structure, material or feature that the description of reference term " embodiment ", " some embodiments ", " example ", " concrete example " or " some examples " etc. means to describe in conjunction with this embodiment or example are contained at least one embodiment of the present invention or example.In this manual, to the schematic representation of above-mentioned term not must for be identical embodiment or example.And the specific features of description, structure, material or feature can combine in one or more embodiment in office or example in an appropriate manner.In addition, when not conflicting, the feature of the different embodiment described in this description or example and different embodiment or example can carry out combining and combining by those skilled in the art.Although illustrate and describe embodiments of the invention above, be understandable that, above-described embodiment is exemplary, can not be interpreted as limitation of the present invention, and those of ordinary skill in the art can change above-described embodiment within the scope of the invention, revises, replace and modification.

Claims (9)

1. a preparation method for preformed curvature integrated timber, is characterized in that, comprises the following steps:
Multiple plank with predetermined thickness is provided;
By the part in multiple described plank, longitudinal finger is to obtain multiple finger laminate between two, and each of the remainder in multiple described plank is non-finger laminate, and wherein said finger laminate and described non-finger laminate are referred to as laminate;
Multiple described laminate was placed for first scheduled time, measures the elastic stage maximum defluxion of each in multiple described laminate, and choose the flexible minimum profile curvature radius of the 3%-10% tantile under 75%-90% confidential interval as described laminate;
Multiple described laminate is utilized to be processed into multiple preformed curvature integrated timber, the processing radius of curvature of multiple described preformed curvature integrated timber is different from each other, described in one of them, the processing radius of curvature of preformed curvature integrated timber equals described laminate minimum profile curvature radius, and described in all the other, the processing radius of curvature of preformed curvature integrated timber is greater than described minimum profile curvature radius;
Multiple described preformed curvature integrated timber was placed for second scheduled time, until multiple described preformed curvature integrated timber no longer deforms, then measure the actual curvature radius of multiple described preformed curvature integrated timber, then set up relation curve and the functional relation of described actual curvature radius and described processing radius of curvature;
According to the radius of curvature of engineering site actual needs, calculate processing radius of curvature by described functional relation, processing obtains the preformed curvature integrated timber with corresponding processing radius of curvature.
2. the preparation method of preformed curvature integrated timber according to claim 1, is characterized in that, multiple described laminate by adhesive bonds together, is then processed into described preformed curvature integrated timber by bending mould or press.
3. the preparation method of preformed curvature integrated timber according to claim 2, is characterized in that, described adhesive be selected from isocyanate adhesive, resorcinol adhesive, epoxyn and polyurethane adhesive one or more.
4. the preparation method of preformed curvature integrated timber according to claim 1, is characterized in that, described first scheduled time is 2 hours-4 hours, and described second scheduled time is 72 hours-120 hours.
5. the preparation method of preformed curvature integrated timber according to claim 1, is characterized in that, multiple described preformed curvature integrated timber temperature be 20 degrees Celsius-30 degrees Celsius, relative humidity places described second scheduled time under being the environment of 55%-65%.
6. the preparation method of preformed curvature integrated timber according to claim 1, is characterized in that, the length of described plank is 25 times-30 times of the thickness of described plank.
7. the preparation method of preformed curvature integrated timber according to claim 1, is characterized in that, chooses the flexible minimum profile curvature radius of 5% tantile under 75% confidential interval as described laminate.
8. the preparation method of preformed curvature integrated timber according to claim 1, it is characterized in that, multiple described laminate temperature be 70 degrees Celsius-90 degrees Celsius, relative humidity places described first scheduled time under being the environment of 100%, then measures the elastic stage maximum defluxion of each in multiple described laminate.
9. the preparation method of the preformed curvature integrated timber according to any one of claim 1-8, it is characterized in that, be 70 degrees Celsius-90 degrees Celsius in temperature, under relative humidity is the environment of 100%, utilize described laminate to be processed into multiple described preformed curvature integrated timber.
CN201410773520.6A 2014-12-12 2014-12-12 The preparation method of preformed curvature integrated timber CN104493918B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201410773520.6A CN104493918B (en) 2014-12-12 2014-12-12 The preparation method of preformed curvature integrated timber

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201410773520.6A CN104493918B (en) 2014-12-12 2014-12-12 The preparation method of preformed curvature integrated timber

Publications (2)

Publication Number Publication Date
CN104493918A CN104493918A (en) 2015-04-08
CN104493918B true CN104493918B (en) 2016-03-02

Family

ID=52935417

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201410773520.6A CN104493918B (en) 2014-12-12 2014-12-12 The preparation method of preformed curvature integrated timber

Country Status (1)

Country Link
CN (1) CN104493918B (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106182223B (en) * 2016-09-09 2019-02-05 南京工业大学 The excessively curved correction forming method of variable cross-section arc glue laminated wood member
CN106239680B (en) * 2016-09-09 2018-08-31 南京工业大学 The variable cross-section arc glue laminated wood member preparation method of high form accuracy
CN106239681B (en) * 2016-09-09 2019-02-05 南京工业大学 A kind of arc glue laminated wood member preparation method of shape springback compensation
CN106378849B (en) * 2016-09-09 2019-06-21 南京工业大学 Arc glue laminated wood member forming method based on timber plasticity

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0825172B2 (en) * 1991-12-27 1996-03-13 越井木材工業株式会社 Cylindrical veneer laminated material
CN1030137C (en) * 1993-05-19 1995-10-25 北京林业大学 Wooden phenolic resin layer material and its manufacture method
JP3314925B2 (en) * 1999-12-07 2002-08-19 丸玉産業株式会社 Wooden door and its manufacturing method
JP2004300676A (en) * 2003-03-28 2004-10-28 Panahome Corp Spandrel wall structure
JP2007202414A (en) * 2006-01-31 2007-08-16 Kichinosuke Nagashio Seedling pot utilizing thinned timber
CN102514051A (en) * 2011-12-21 2012-06-27 北京林业大学 Basalt continuous fiber reinforced bamboo-wood composite material and method for manufacturing same
CN104084997B (en) * 2014-07-07 2016-04-27 南京林业大学 Continuously shaped composite construction material and manufacture method thereof
CN104149150B (en) * 2014-07-17 2017-01-04 北美枫情木家居(江苏)有限公司 A kind of ancient imitation floor board manufacture method
CN104118019A (en) * 2014-07-22 2014-10-29 哈尔滨盛世华林科技有限公司 Novel solid-wood splice plate manufacturing method

Also Published As

Publication number Publication date
CN104493918A (en) 2015-04-08

Similar Documents

Publication Publication Date Title
CN201876396U (en) Measuring device of static normal direction contact stiffness of junction plane
CN101788427B (en) Device for detecting mechanical property of multifunctional film
CN201600105U (en) Go / no go gage for detecting thickness of parts
CN103439194B (en) A kind of compound substance II mode-Ⅲ crack spreading rate assay method that can obtain Crack Extension S-N curve
CN204269483U (en) A kind of concrete block pressure test device
CN102289980B (en) Method for preparing preset cracks in hydrofracture simulation specimen
CN104897108A (en) Novel strain gauge
WO2011034584A3 (en) Optical position and/or shape sensing
WO2009089189A3 (en) Cell culture array system for automated assays and methods of operation and manufacture thereof
CN103308381B (en) Fatigue crack spreading rate normalization forecasting method
CN101650198B (en) Image processing method for reading pointer type instrument indication value
CN101710011B (en) Method for testing and monitoring cable force of PC steel strand stay cable
CN103792146B (en) Glass plate bending resistance pick-up unit
CN201034921Y (en) Concrete in compression slowly changing experiment tester
CN104297103B (en) 3D print building mortar workability testing device and application
CN104897109A (en) Strain gauge
Rotunno et al. Experimental study of bond behavior of CFRP-to-brick joints
WO2012048156A3 (en) Method of determining an asymmetric property of a structure
CN203772198U (en) Wall template verticality detector
CN102207449A (en) Test method for bonding stress between fiber reinforced plastic bar and concrete
CN103528735B (en) A kind of Miniature optical fiber Fabry-Perot pressure sensor and preparation method thereof
CN104020036B (en) A kind of determine horizontal centre-point load under the method for annular prestressed film maximum defluxion
CN103698225A (en) Four-point bending elastic parameter measuring method and four-point bending elastic parameter measuring system
CN104897112A (en) Novel concrete strain gauge
WO2007149220A3 (en) Methods, systems, and computer program products for adjusting readability of reading material to a target readability level

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
C14 Grant of patent or utility model
GR01 Patent grant
CB03 Change of inventor or designer information
CB03 Change of inventor or designer information

Inventor after: Gao Ying

Inventor after: Zhu Xudong

Inventor after: Wu Yuxuan

Inventor after: Dong Weibo

Inventor after: Guo Zhaoxia

Inventor after: Yuan Tingge

Inventor after: Ding Qingfeng

Inventor after: Gong Xinyuan

Inventor before: Zhu Xudong

Inventor before: Gao Ying

Inventor before: Wu Yuxuan

Inventor before: Dong Weibo

Inventor before: Guo Zhaoxia

Inventor before: Yuan Tingge

Inventor before: Ding Qingfeng

Inventor before: Gong Xinyuan