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WO2019175303A1 - Ensemble de logement d'une dent d'excavatrice comprenant un logement destiné à être disposé sur le godet d'une excavatrice à godets - Google Patents

Ensemble de logement d'une dent d'excavatrice comprenant un logement destiné à être disposé sur le godet d'une excavatrice à godets Download PDF

Info

Publication number
WO2019175303A1
WO2019175303A1 PCT/EP2019/056410 EP2019056410W WO2019175303A1 WO 2019175303 A1 WO2019175303 A1 WO 2019175303A1 EP 2019056410 W EP2019056410 W EP 2019056410W WO 2019175303 A1 WO2019175303 A1 WO 2019175303A1
Authority
WO
WIPO (PCT)
Prior art keywords
receiving
blade
arrangement
contact
contact surface
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/EP2019/056410
Other languages
German (de)
English (en)
Inventor
Viktor Raaz
Tomasz Kwiatkowski
Edeltraud BUTTERBACH
Michael Busch
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ThyssenKrupp AG
ThyssenKrupp Industrial Solutions AG
Original Assignee
ThyssenKrupp AG
ThyssenKrupp Industrial Solutions AG
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 ThyssenKrupp AG, ThyssenKrupp Industrial Solutions AG filed Critical ThyssenKrupp AG
Priority to EP19712157.7A priority Critical patent/EP3765679B1/fr
Priority to AU2019235398A priority patent/AU2019235398B2/en
Priority to CN201980018404.4A priority patent/CN111836936B/zh
Priority to RS20240539A priority patent/RS65516B1/sr
Publication of WO2019175303A1 publication Critical patent/WO2019175303A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/28—Small metalwork for digging elements, e.g. teeth scraper bits
    • E02F9/2866—Small metalwork for digging elements, e.g. teeth scraper bits for rotating digging elements
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/28—Small metalwork for digging elements, e.g. teeth scraper bits
    • E02F9/2808—Teeth
    • E02F9/285—Teeth characterised by the material used

Definitions

  • the present invention relates to a receiving arrangement of an excavator tooth with a receptacle for mounting on a blade blade of a blade of a bucket wheel excavator, wherein the excavator tooth has a tooth tip and a receiving shaft adjoining the tooth tip, and wherein the receptacle has a receiving opening for receiving the receiving shaft.
  • EP 0 584 101 B1 discloses by way of example a receiving arrangement of an excavator tooth with a receptacle for arrangement on the blade of a bucket wheel excavator.
  • the excavator tooth has a tooth head and an adjoining the tooth head receiving shaft, wherein the receptacle has a receiving opening for receiving the receiving shaft.
  • a securing element serves to prevent the receiving shaft from disengaging from the receiving opening.
  • DE 34 44 563 A1 describes a type-related receiving arrangement of a digger tooth.
  • Typical bucket wheel excavator tooth mounting systems which allow the worn tooth to be replaced in a very short time, typically consist of three major components.
  • the excavator tooth and the recording are usually simply wedged in the support area and are secured gap-free with the help of the securing element only in their tooth longitudinal axis.
  • the receptacle is in turn usually insoluble attached to the blade of the bucket wheel excavator, for example, by a weld which connects the receptacle with a blade knife insoluble.
  • the object of the invention is the development of a receiving arrangement of a bucket tooth in a receptacle for arranging a blade of a bucket wheel excavator, wherein the receiving arrangement should have a simple configuration, and wherein the bucket tooth should be able to withstand changing loads.
  • the excavator tooth should be easily exchanged in the recording.
  • the invention includes the technical teaching that the receptacle has a U-shaped receiving body, which is arranged on a blade blade contact surface of a blade blade of a blade, wherein the receiving body has two spaced and inclined to each other formed contact surfaces, wherein the contact surfaces and the Schaufelmesserstrom Colour a triangle arrangement to each other form.
  • the receiving arrangement according to the invention makes it possible to receive an excavator tooth in such a way that the excavator tooth can pick up both the main digging forces and lateral graining forces and transfer them into the receptacle of the receiving arrangement without premature loosening of the excavator tooth in the receptacle.
  • the triangular arrangement has an end face arranged opposite the blade blade contact surface in the manner of a roof surface, wherein the end face is arranged such that the triangular arrangement comprises / forms a trapezoidal geometry.
  • the roof surface is preferably non-contact, ie without support function with respect to the excavator tooth.
  • the receiving body defines at least five surfaces comprising the two mutually inclined abutment surfaces, wherein the two mutually inclined abutment surfaces are arranged at second and fourth position and form together with the Schaufelmesserstrom constitutional the triangular arrangement.
  • the surfaces between the abutment surfaces are preferably contact-free side surfaces, that is to say without a support function with regard to the excavator tooth. These side surfaces are arranged between the two mutually inclined abutment surfaces and the blade blade contact surface.
  • the two contact surfaces which are inclined relative to one another are respectively arranged between opposing receiving shaft surfaces and between an end face arranged opposite the blade blade contact surface.
  • the end face is preferably non-contact, ie without support function with respect to the excavator tooth.
  • the triangular arrangement in cross-section has the geometry of a capped, flattened roof, or has a trapezoidal geometry. This provides an advantageous geometric arrangement.
  • the two inclined to each other bearing surfaces of opposite receiving shaft surfaces and a opposite to the blade blade contact surface arranged end face are included, wherein the proportion of non-contact surfaces in the receiving arrangement with respect to the proportion of the bucket tooth contacting surfaces (16) is at least 50%, preferably at least 75%, and more preferably greater than or equal to the entire contact surfaces.
  • the cross-sectional lengths of the contact surfaces can be at least 50% or at least 75% of the cross-sectional length of the end face. This also provides an advantageous geometric arrangement. In particular, it is provided that the cross-sectional lengths of the contact surfaces amount to at least 25% or at least 50% of the cross-sectional length of the receiving shaft surfaces.
  • the two inclined to each other bearing surfaces with opposite receiving shaft surfaces each include an angle in the range of 110 ° to 160 °, preferably 120 ° to 150 °, more preferably 125 to 145 °. This provides an advantageous geometric arrangement.
  • the two abutment surfaces formed inclined with respect to one / the opposite to the blade blade contact surface arranged end face each include an angle in the range of 1 10 ° to 160 °, preferably 120 ° to 150 °, more preferably 125 to 145 °. This provides an advantageous geometric arrangement.
  • the respective receiving shaft surface can be arranged at least approximately orthogonal to the blade blade contact surface, in particular exactly orthogonal.
  • the receptacle has the U-shaped receiving body and a contact plate, wherein the receiving body, the two spaced and inclined to each other bearing surfaces and the contact plate have a further contact surface, and wherein the three contact surfaces form a triangle arrangement to each other.
  • the contour of the abutment surface of the abutment plate preferably correlates with the contour of the blade blade abutment surface of the blade blade. This makes possible by way of example, that the contact plate can be located without gaps on the blade blade contact surface or can be arranged. Gap-free here means that there are no gaps between the surfaces, so that an optimal power transmission can take place.
  • the abutment surfaces which are produced internally in the receiving opening of the receiving body, can be milled in a simple manner, and the abutment plate can have a contact surface which already has the abutment plate in the state of a semifinished product.
  • the contact plate then only has to be brought to the desired size, and the contact plate can be arranged on the U-shaped receiving body, that the two contact surfaces in the receiving opening of the receiving body and the contact surface on the contact plate form a triangle arrangement with each other and a corresponding positional tolerance to each other form.
  • the three surfaces need not intersect, and the three surfaces may be limited so that they are spaced from each other.
  • the triangular arrangement arises only by the alignment of the contact surfaces to each other, for example by the two contact surfaces are formed in the receiving body as roof surfaces and form catheters, so that the contact surface forms a Hypotenuse on the contact plate, which is to be regarded as a base, so that the two contact surfaces in Receiving body roof-like over the contact surface on the contact plate extend.
  • the blade blade contact surface or the contact plate is arranged on the receiving body such that an opening side of the U-shape of the receiving body with the blade blade contact surface or the contact plate is at least partially closed.
  • the inner wall of the receiving opening in the receiving body and the contact plate thereby form a closed inner contour for receiving the receiving shaft of the excavator tooth.
  • the receiving opening has an opening longitudinal axis along which the receiving shaft can be inserted into the receiving opening.
  • the contact surfaces of the receiving body and the contact surface of the contact plate or the Schaufelmesserstrom configuration can point to the opening longitudinal axis.
  • the two mutually inclined contact surfaces, which form part of the inner contour of the receiving opening, do not have to intersect in a common edge, and it can be provided over the contact plate, a further roof surface, so that the Ouerterrorismsform the receiving opening forms approximately a trapezoid.
  • the receiving body on an outlet side, via which the excavator tooth can be introduced to the arrangement of the receiving shaft in the receptacle.
  • the contact surfaces can run towards each other with increasing distance from the mouth side along the opening longitudinal axis of the receiving opening, so that they can form the surfaces of a three-sided pyramid or in the cross section a quadrangular trapezium, in particular a quadrilateral with a flat top. Consequently, the sectional area of the trapezoidal shape of the receiving opening above the abutment plate becomes smaller with increasing distance from the mouth side of the receptacle.
  • the abutment plate is welded to the receiving body and / or to the blade knife.
  • the receiving body may have outside of the edges formed welding bevels, via which the receiving body can be welded to the blade of a bucket wheel excavator.
  • only the contact plate can be welded to the receiving body in order subsequently to weld the composite of the receiving body and the abutment plate to the blade of the bucket wheel excavator, in particular to a blade knife.
  • the two spaced and inclined to each other formed contact surfaces on the receiving body can be machined.
  • a receiving groove on the respective legs of the U-shaped receiving body for welding the abutment plate machined to allow accurate positioning of the abutment plate on the receiving body in particular using the reference body in the form of the receiving shaft.
  • the two contact surfaces which are inclined relative to one another can each be arranged between opposing receiving shaft surfaces and between an end face arranged opposite the blade blade contact surface. This provides an advantageous geometric arrangement.
  • the two inclined to each other bearing surfaces can be arranged with opposite receiving shaft surfaces each at an angle in the range of 125 to 145 °. This provides an advantageous geometric arrangement.
  • the two contact surfaces which are inclined relative to one another can be arranged in each case at an angle in the range from 125 to 145 ° with one end face arranged opposite the blade blade contact surface. This provides an advantageous geometric arrangement.
  • the invention further relates to a method for forming a receiving arrangement of an excavator tooth with a receptacle for mounting on a blade of a blade of a bucket wheel excavator, wherein the excavator tooth has a tooth head and a receiving shaft adjoining the tooth head, and wherein the receptacle has a receiving opening for receiving of the receiving shaft, and wherein a blade has a blade blade with a blade blade contact surface.
  • the inventive method provides for the following steps: generating two spaced and inclined to each other formed contact surfaces in a receiving opening the inner portion of the U-shaped receiving body, arranging the receiving body on the blade blade contact surface, so that a Opening side of the U-shape of the receiving body with the blade blade contact surface is at least partially closed and the three contact surfaces form a triangle arrangement to each other.
  • a preferred measure of the invention is characterized by providing a contact plate with a further contact surface on the blade blade contact surface and arranging the contact plate to the receiving body, so that an opening side of the U-shape of the receiving body is at least partially closed with the contact plate and the three contact surfaces a triangular arrangement form each other.
  • the contour of the abutment surface of the abutment plate preferably correlates with the contour of the blade blade abutment surface of the blade blade. This allows, by way of example, that the contact plate can lie without gaps on the blade blade contact surface or can be arranged.
  • the contact plate can be welded to the receiving body, wherein a reference body in the form of the receiving shaft can be inserted into the receiving opening for positioning of the contact plate to the receiving body.
  • a reference body in the form of the receiving shaft can be inserted into the receiving opening for positioning of the contact plate to the receiving body.
  • Figure 1 is a side view of a preferred embodiment of a
  • Receiving arrangement with a bucket tooth which is arranged in a receptacle, wherein the receiving body of the receptacle is shown partially cut,
  • FIG. 2 shows a cross-sectional view of the receiving arrangement according to FIG. 1,
  • FIG. 3 shows a rear view of the receiving shaft of the excavator tooth
  • Figure 4 is a perspective view of the excavator tooth with the tooth head and the adjoining the back of the tooth head receiving shaft and
  • Figure 5 is a perspective view of the receiving assembly with the
  • FIG. 1 shows in a side view a preferred embodiment of a receiving arrangement 1 with an excavator tooth 10 and with a receptacle 2 for arrangement on the blade of a bucket wheel excavator.
  • the excavator tooth 10 has a tooth head 1 1, which is brought in use of the bucket wheel excavator with the material to be removed in contact, and the excavator tooth 10 has a rear of the tooth head 1 1 subsequent receiving shaft 12 which in a receiving opening 13 of the receptacle. 2 is introduced.
  • the receptacle 2 has as an essential part of a receiving body 14 which has a U-shaped basic shape.
  • the receiving opening 13 is formed, and the opening side of the U-shape of the receiving body 14 is closed by a contact plate 15.
  • the contact plate 15 is arranged on a blade blade contact surface 26 of a blade blade 22 of a blade.
  • the opening side of the U-shape of the receiving body 14 is arranged with a contact plate 15 on the blade blade contact surface 26. This is due, in particular, to the fact that the contour of the contact surface 17 of the contact plate 15 correlates with the contour of the blade blade contact surface 26 of the blade diameter. This allows, for example, that the contact plate 15 can lie without gaps on the blade blade contact surface 26.
  • the receiving opening 13 is wedge-shaped and has an outlet side 19 with a large cross-section, which is continuously smaller with increasing distance from the mouth side 19.
  • the rear side of the receiving shaft 12 is secured with a securing element 25 in the receiving opening 13.
  • Figure 2 shows a view of a cross section through the arrangement of the receiving shaft 12 in the receiving body 14 of the receptacle 2.
  • the inner portion of the receiving body 14 has two spaced and inclined to each other formed contact surfaces 16 which extend over the contact plate 15 as a two-sided roof.
  • the contact plate 15 has a further contact surface 17, and the cross-sectional view shows that the three contact surfaces 16, 17 thus form a triangle arrangement with each other. In this case, all contact surfaces 16, 17 point to an opening longitudinal axis 18. Furthermore, the contact surfaces 16 and the blade blade contact surface 26 form a triangle arrangement with each other.
  • the cross-sectional view illustrates that forces are applied to the receiving shaft 12 from each direction transverse to the opening longitudinal axis 18 and into the receptacle 2 can be transferred.
  • the welds 23 for attachment of the contact plate 15 on the receiving body 14 serve only to form a closed contour of the receiving opening 13 with correspondingly tight tolerances, and forces from the receiving shaft 12 in the direction of Contact plate 15 act, can be transferred directly into the bending blade blade 22 executed.
  • FIG. 2 further describes a receiving shaft surface 12. 1 and an end surface 12. 2, which can each form the triangular arrangement.
  • the upper side of the excavator tooth is preferably supported exclusively by means of the two contact surfaces 16.
  • the other upper and lateral surfaces can remain free of contact (apart from the lower surface 17).
  • the two opposite receiving shaft surfaces 12.1 and the end face 12.2 are each contact-free. Accordingly, the proportion of non-contact areas in the receiving arrangement with respect to the proportion of the contacting surfaces (16) at least 50%, preferably at least 75%, and more preferably be greater than or equal to the entire contact surfaces.
  • FIG. 3 shows a rear view of the excavator tooth 10 with the tooth head and with the receiving shaft 12.
  • the abutment shank 12 has the abutment surfaces 16 'and 17' which correspond to the arrangement of the abutment surfaces 16 and 17 of the receiving arrangement 1.
  • Figure 4 shows in a perspective view of the excavator tooth 10 with the abutment surfaces 16 'and 17', which partially contour the receiving shaft 12 and the cross section of the receiving shaft 12 tapers with increasing distance from the tooth head eleventh
  • Figure 5 shows in a further perspective view of the arrangement of the excavator tooth 10 with the tooth head 1 1 and with the receiving shaft 12 in the receptacle 2.
  • the receiving shaft 12 is secured with a securing element 25 against removal of the excavator tooth 10 from the receptacle 2.
  • a first welding slope 20 is made larger and allows a weld to be arranged on the blade diameter 22 with a larger cross-section for receiving larger forces, and the back is followed by a smaller welding slope 21 on the receiving body 14, which allows a smaller weld, since with increasing distance from Tooth 11, the forces to be transmitted from the receiving body 14 to the blade 22 to be reduced.

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  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Component Parts Of Construction Machinery (AREA)

Abstract

L'invention concerne un ensemble de logement (1) d'une dent d'excavatrice (10), comprenant un logement (2) destiné à être disposé sur le godet d'une excavatrice à godets. La dent (10) d'excavatrice comporte une tête de dent (11) et une tige de logement (12) se raccordant à la tête de dent (11). Le logement (2) comporte une ouverture (13) de logement servant à loger la tige de logement (12). Selon l'invention, le logement (2) comporte un corps (14) de logement en forme de Y, qui est disposé sur une surface d'appui de lame de godet (26) d'une lame (22) d'un godet. Le corps (14) de logement comporte deux surfaces d'appui (16) réalisées à distance et de manière inclinée l'une par rapport à l'autre, et les surfaces d'appui (16) et la surface d'appui (26) de lame de godet forment un ensemble triangulaire. L'invention concerne en outre une dent (10) d'excavatrice, un corps (14) de logement, une plaque d'appui (15) ainsi qu'un procédé servant à former un ensemble de logement (1) de ce type.
PCT/EP2019/056410 2018-03-14 2019-03-14 Ensemble de logement d'une dent d'excavatrice comprenant un logement destiné à être disposé sur le godet d'une excavatrice à godets Ceased WO2019175303A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP19712157.7A EP3765679B1 (fr) 2018-03-14 2019-03-14 Ensemble de logement d'une dent d'excavatrice comprenant un logement destiné à être disposé sur le godet d'une excavatrice à godets
AU2019235398A AU2019235398B2 (en) 2018-03-14 2019-03-14 Holding assembly of an excavator tooth, having a holder, for arranging on the bucket of a bucket-wheel excavator
CN201980018404.4A CN111836936B (zh) 2018-03-14 2019-03-14 用于布置在斗轮挖掘机的铲斗上的、具有接收器的挖掘机齿的接收组件
RS20240539A RS65516B1 (sr) 2018-03-14 2019-03-14 Prihvatni sklop zuba bagera sa prihvatom za postavljanje na kašici rotornog bagera

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102018203913.5A DE102018203913A1 (de) 2018-03-14 2018-03-14 Aufnahmeanordnung eines Baggerzahnes mit einer Aufnahme zur Anordnung an der Schaufel eines Schaufelradbaggers
DE102018203913.5 2018-03-14

Publications (1)

Publication Number Publication Date
WO2019175303A1 true WO2019175303A1 (fr) 2019-09-19

Family

ID=65818511

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2019/056410 Ceased WO2019175303A1 (fr) 2018-03-14 2019-03-14 Ensemble de logement d'une dent d'excavatrice comprenant un logement destiné à être disposé sur le godet d'une excavatrice à godets

Country Status (6)

Country Link
EP (1) EP3765679B1 (fr)
CN (1) CN111836936B (fr)
AU (1) AU2019235398B2 (fr)
DE (1) DE102018203913A1 (fr)
RS (1) RS65516B1 (fr)
WO (1) WO2019175303A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20240044249A1 (en) * 2022-08-02 2024-02-08 Kennametal Inc. Cutter tooth assembly for an excavating tool

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3507345A (en) * 1967-11-03 1970-04-21 Woodland Mfg Co Cutter bit
DE7045807U (de) * 1970-12-11 1972-01-27 Lehnhoff Hartstahl Kg Hulsenhalterung fur Baggerschaufel zahne
DE3444563A1 (de) 1984-12-06 1986-06-19 Lehnhoff Hartstahl GmbH & Co, 7570 Baden-Baden Baggerzahn-anordnung
EP0584101A1 (fr) 1991-05-07 1994-03-02 Magotteaux Int Ensemble dent/porte-dent destine a des tetes de fraisage.
DE202015006273U1 (de) * 2015-09-10 2015-10-08 Thyssenkrupp Ag Zahnanordnung zum Anbringen an eine Baggerschaufel oder eine Brechwalze

Family Cites Families (7)

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Publication number Priority date Publication date Assignee Title
US1519101A (en) * 1924-01-14 1924-12-16 Erie Steam Shovel Company Excavating device
FR2277944A1 (fr) * 1974-07-08 1976-02-06 Bofors Ab Element rapporte de fixation des dents d'une pelle excavatrice
DE2930766C2 (de) * 1979-07-28 1984-08-09 O & K Tagebau und Schiffstechnik, Zweigniederlassung der O & K Orenstein & Koppel AG, 2400 Lübeck Halterung für Baggerzähne an Schaufeln, Eimern, Kübeln o.dgl.
ES8702556A1 (es) * 1985-04-03 1987-01-01 Gamma Lock Pty Ltd Perfeccionamientos en dientes para equipos movedores de tierras
DE102009059189A1 (de) * 2009-12-17 2011-06-22 Wirtgen GmbH, 53578 Meißelhalter und Basisteil zur Aufnahme eines Meißelhalters
NZ618122A (en) * 2011-05-20 2015-01-30 Sandvik Mining & Constr Oy Ground engaging wear member and means of mechanical attachment
CN102864813B (zh) * 2012-07-26 2016-12-07 宁波禾顺新材料有限公司 一种稳定的挖掘机铲斗齿、齿座及其组件

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3507345A (en) * 1967-11-03 1970-04-21 Woodland Mfg Co Cutter bit
DE7045807U (de) * 1970-12-11 1972-01-27 Lehnhoff Hartstahl Kg Hulsenhalterung fur Baggerschaufel zahne
DE3444563A1 (de) 1984-12-06 1986-06-19 Lehnhoff Hartstahl GmbH & Co, 7570 Baden-Baden Baggerzahn-anordnung
EP0584101A1 (fr) 1991-05-07 1994-03-02 Magotteaux Int Ensemble dent/porte-dent destine a des tetes de fraisage.
DE202015006273U1 (de) * 2015-09-10 2015-10-08 Thyssenkrupp Ag Zahnanordnung zum Anbringen an eine Baggerschaufel oder eine Brechwalze

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20240044249A1 (en) * 2022-08-02 2024-02-08 Kennametal Inc. Cutter tooth assembly for an excavating tool

Also Published As

Publication number Publication date
AU2019235398B2 (en) 2022-08-04
EP3765679A1 (fr) 2021-01-20
EP3765679B1 (fr) 2024-02-21
RS65516B1 (sr) 2024-06-28
CN111836936B (zh) 2023-03-28
DE102018203913A1 (de) 2019-09-19
AU2019235398A1 (en) 2020-10-29
CN111836936A (zh) 2020-10-27

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