CN109210990A - The structure that extracts and gun - Google Patents
The structure that extracts and gun Download PDFInfo
- Publication number
- CN109210990A CN109210990A CN201810869944.0A CN201810869944A CN109210990A CN 109210990 A CN109210990 A CN 109210990A CN 201810869944 A CN201810869944 A CN 201810869944A CN 109210990 A CN109210990 A CN 109210990A
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- Prior art keywords
- chamber
- linear driving
- ejection
- driving mechanism
- cartridge
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- 239000000284 extract Substances 0.000 title abstract 8
- 230000007246 mechanism Effects 0.000 claims abstract description 145
- 230000005540 biological transmission Effects 0.000 claims abstract description 44
- 230000033001 locomotion Effects 0.000 claims abstract description 8
- 239000002184 metal Substances 0.000 abstract description 5
- 238000010276 construction Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 238000010304 firing Methods 0.000 description 2
- 230000003993 interaction Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F41—WEAPONS
- F41A—FUNCTIONAL FEATURES OR DETAILS COMMON TO BOTH SMALLARMS AND ORDNANCE, e.g. CANNONS; MOUNTINGS FOR SMALLARMS OR ORDNANCE
- F41A15/00—Cartridge extractors, i.e. devices for pulling cartridges or cartridge cases at least partially out of the cartridge chamber; Cartridge ejectors, i.e. devices for throwing the extracted cartridges or cartridge cases free of the gun
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Toys (AREA)
Abstract
It extracts structure and gun the invention discloses one kind, is related to firearms technical field, extracted difficult technical problem with alleviating caseless cartridge existing in the prior art.The structure that extracts includes straight line driving mechanism, transmission mechanism, cartridge chamber and ejecting mechanism；Straight line driving mechanism is horizontally disposed, and can move, be sequentially connected in the horizontal direction with transmission mechanism, for transmitting linear driving force to transmission mechanism；Transmission mechanism is connect with cartridge chamber, moves to the station that extracts under the driving of linear driving force；Cartridge chamber has the chamber for accommodating bullet, and chamber can move to the station that extracts with cartridge chamber；Ejecting mechanism, horizontally disposed and face are in the chamber for the station that extracts, and can eject the indoor residue of chamber in the station that extracts to chamber movement under the drive of straight line driving mechanism.The gun include the above-mentioned structure that extracts.Technical solution provided by the invention had not only facilitated extracting for metal cartridge bullet, but also facilitated extracting for caseless cartridge.
Description
Technical Field
The invention relates to the technical field of firearms, in particular to a bullet withdrawing structure and a firearm.
Background
The chamber of the existing chamber-rotating structure needs to be rotated once to change the chamber when a bullet is fired, and the firearms of the existing chamber-rotating structure can only fire metal cartridge bullets but cannot fire caseless bullets. The shell-free cartridge has no rigid bottom edge of the metal cartridge, can not be drawn and drawn by the shell drawing hook to retreat, and is difficult to retreat.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art that is known to a person skilled in the art.
Disclosure of Invention
The invention aims to provide a shell-free shell ejecting structure and a gun, so as to solve the technical problem of difficulty in shell-free shell ejecting in the prior art.
In order to solve the above problems, the present invention provides the following technical solutions:
a bullet withdrawing structure comprises a linear driving mechanism, a transmission mechanism, a bullet chamber and an ejection mechanism;
the linear driving mechanism is horizontally arranged, can move along the horizontal direction, is in transmission connection with the transmission mechanism and is used for transmitting linear driving force to the transmission mechanism;
the transmission mechanism is connected with the ammunition chamber and moves to an ammunition withdrawing station under the drive of the linear driving force;
the cartridge chamber having a chamber for containing a cartridge, the chamber being movable with the cartridge chamber to the ejection station;
the ejection mechanism is horizontally arranged and is opposite to the cavity in the ejection station, and can move towards the cavity under the driving of the linear driving mechanism so as to eject residues in the cavity in the ejection station.
Further, in the present invention,
the transmission mechanism comprises a cam and a first lug fixed on the linear driving mechanism, a first guide groove is formed in the outer surface of the cam, and the first lug extends into the first guide groove and moves along the slotting path of the first guide groove under the driving of the linear driving mechanism.
Further, in the present invention,
the first guide groove comprises a first straight groove, a spiral groove and a second straight groove which are sequentially communicated, the first straight groove is parallel to the second straight groove in parallel with the axis of the cam, and the spiral groove is obliquely arranged.
Further, in the present invention,
the cartridge chamber is of a single-chamber rotary chamber structure;
or,
the cartridge chamber is a double-chamber rotating chamber structure, and the end part of the cam is connected with the rotating center of the cartridge chamber through a ratchet wheel and pawl mechanism.
Further, in the present invention,
the transmission mechanism comprises a second guide groove arranged on the side surface, facing the cartridge chamber, of the linear driving mechanism and a second lug arranged on the cartridge chamber;
the second bump extends into the second guide groove and can move along the slotting path of the second guide groove under the drive of the linear driving mechanism.
Further, in the present invention,
the second guide groove comprises a third straight groove, a chute and a fourth straight groove which are connected in sequence;
the third straight groove and the fourth straight groove are parallel to the motion direction of the linear driving mechanism; the chute is obliquely arranged.
Further, in the present invention,
the ammunition chamber can transversely move to an ammunition withdrawing station under the drive of the transmission mechanism.
Further, in the present invention,
the ejection mechanism is fixed on the linear driving mechanism and can move along with the movement of the linear driving mechanism.
Further, in the present invention,
the ejection mechanism is separated from the linear driving mechanism, and can move towards the ammunition chamber direction after the linear driving mechanism moves to be contacted with the ejection mechanism.
A gun comprises the ejection structure.
By combining the technical scheme, the beneficial effects brought by the invention are analyzed as follows:
the invention provides a bullet withdrawing structure which comprises a linear driving mechanism, a transmission mechanism, a bullet chamber and an ejection mechanism, wherein the linear driving mechanism is arranged on the transmission mechanism; the linear driving mechanism is horizontally arranged, can move along the horizontal direction, is in transmission connection with the transmission mechanism and is used for transmitting linear driving force to the transmission mechanism; the transmission mechanism is connected with the ammunition chamber and moves to an ammunition withdrawing station under the drive of the linear driving force; the cartridge chamber is provided with a chamber for accommodating a cartridge, and the chamber can move to a cartridge withdrawing station along with the cartridge chamber; the ejection mechanism is horizontally arranged and is opposite to the cavity at the ejection station, and can move towards the cavity under the driving of the linear driving mechanism so as to eject residues in the cavity at the ejection station.
When the ejection structure is used for ejecting, the linear driving mechanism is horizontally pulled, the linear driving mechanism drives the transmission mechanism, and the transmission mechanism enables the ammunition chamber to move to an ejection station; and continuously pulling the linear driving mechanism, wherein the linear driving mechanism drives the ejection mechanism to extend into the cavity of the ejection station, and the residues in the cavity of the ejection station are ejected out.
The shell withdrawing structure adopts an ejecting mode to eject residues in the cavity, so that the metal cartridge shell is convenient to withdraw, and the shell-free shell is convenient to withdraw.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a bullet withdrawing structure of a double-chamber rotating-chamber structure provided by the invention;
fig. 2 is a schematic structural diagram of a bullet withdrawing structure of the bullet chamber and chamber rotating structure provided by the invention;
FIG. 3 is a surface development view of a cam in the ejection structure provided by the present invention;
FIG. 4 is a schematic structural view of an embodiment of the projectile ejecting structure of the traverse chamber provided by the invention;
FIG. 5 is a cross-sectional view taken along the plane A-A in FIG. 4;
FIG. 6 is a view taken along the direction B in FIG. 4;
FIG. 7 is a schematic structural view of another embodiment of the projectile ejecting structure of the traverse chamber provided by the invention;
fig. 8 is a sectional view taken along the plane C-C in fig. 7.
Icon: 1-a linear drive mechanism; 2-a transmission mechanism; 21-a cam; 211-a first guide groove; 2111-first straight slot; 2112-helical groove; 2113-second straight slot; 22-a first bump; 23-a second guide groove; 231-third straight slot; 232-chute; 233-fourth straight slot; 24-a second bump; 3-cartridge chamber; 4-an ejection mechanism; 5-ratchet-pawl mechanism; 6-barrel of gun; 7-gun body.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Embodiment 1 and embodiment 2 are described in detail below with reference to the accompanying drawings:
example 1
The present embodiment provides a bullet withdrawing structure of a rotary chamber, please refer to fig. 1 to 8 in the drawings of the specification together.
The bullet withdrawing structure comprises a linear driving mechanism 1, a transmission mechanism 2, a bullet chamber 3 and an ejection mechanism 4; the linear driving mechanism 1 is horizontally arranged, can move along the horizontal direction, is in transmission connection with the transmission mechanism 2 and is used for transmitting linear driving force to the transmission mechanism 2; the transmission mechanism 2 is connected with the ammunition chamber 3 and moves to an ammunition withdrawing station under the drive of a linear driving force; the cartridge chamber 3 has a chamber for receiving a cartridge, the chamber being movable with the cartridge chamber 3 to a retraction station; the ejection mechanism 4 is horizontally arranged and is opposite to the cavity in the ejection station, and can move towards the cavity under the driving of the linear driving mechanism 1 so as to eject residues in the cavity in the ejection station.
When the ejection structure is used for ejecting, the linear driving mechanism 1 is horizontally pulled, the linear driving mechanism 1 drives the transmission mechanism 2, and the transmission mechanism 2 enables the cartridge chamber 3 to move to an ejection station; and continuously pulling the linear driving mechanism 1, wherein the linear driving mechanism 1 drives the ejection mechanism 4 to extend into the cavity of the ejection station, and the residues in the cavity of the ejection station are ejected out.
The shell withdrawing structure adopts an ejecting mode to eject residues in the cavity, so that the metal cartridge shell is convenient to withdraw, and the shell-free shell is convenient to withdraw.
The following describes in detail one form of construction of the drive mechanism 2 for the construction of the cartridge chamber 3.
As shown in fig. 1 and 2, the transmission mechanism 2 includes a cam 21 and a first protrusion 22 fixed to the linear driving mechanism 1, the outer surface of the cam 21 is provided with a first guide groove 211, and the first protrusion 22 extends into the first guide groove 211 and moves along the grooved path of the first guide groove 211 under the driving of the linear driving mechanism 1. The end of the cam 21 is connected to the rotation center of the cartridge chamber 3.
When the bullet is required to be removed, an operator pulls the linear driving mechanism 1 towards the direction pointing to the rear of the gun, the first lug 22 also moves along the horizontal direction, the cam 21 rotates under the action of the first guide groove 211 and the first lug 22, and the bullet chamber 3 connected with the cam 21 rotates, so that the chamber which is finished in work rotates to the bullet removing station. And continuously pulling the linear driving mechanism 1, wherein the linear driving mechanism 1 drives the ejection mechanism 4 to extend into a cavity positioned at the ejection station, and the residues in the cavity are ejected out.
In an alternative to this embodiment, it is preferable that,
as shown in fig. 3, the first guide groove 211 includes a first straight groove 2111, a spiral groove 2112, and a second straight groove 2113 which are sequentially communicated, the first straight groove 2111 and the second straight groove 2113 are arranged in parallel to the axis of the cam 21, the first straight groove 2111 and the second straight groove 2113 are arranged in parallel to the axis of the cam 21, and the spiral groove 2112 is arranged obliquely.
When the first boss 22 moves in the spiral groove 2112, the cam 21 rotates; when the first tab 22 moves in the first straight slot 2111 or the second straight slot 2113, the cam 21 does not rotate.
As shown in fig. 2, the cartridge chamber 3 in the form of the above-described transmission mechanism 2 may be a single-chamber rotary chamber structure, in which case the end of the cam 21 is directly connected to the center of rotation of the cartridge chamber 3.
After the chamber of the cartridge chamber 3 works, an operator pulls the linear driving mechanism 1 towards the direction pointing to the rear of the gun, and the cartridge chamber 3 rotates towards the first direction, so that the chamber rotates to a cartridge withdrawing station; after the ejection is finished, an operator pushes the linear driving mechanism 1 towards the direction pointing to the front of the gun, and the cartridge chamber 3 rotates towards the second direction, so that the chamber rotates to a working station. Wherein the first direction is opposite to the second direction.
As shown in fig. 1, the cartridge chamber 3 adopting the above-described configuration of the transmission mechanism 2 may be a double-chamber rotary chamber structure, in which case the end of the cam 21 is connected to the rotation center of the cartridge chamber 3 through the ratchet-pawl mechanism 5.
The end of the cam 21 is connected with the rotation center of the cartridge chamber 3 by a ratchet-pawl mechanism 5, so that the rotating chamber of the double chambers can rotate along one direction. When an operator pulls the linear driving mechanism 1 to the rear of the gun, the cartridge chamber 3 rotates; after the ejection is finished, when an operator pushes the linear driving mechanism 1 to the front of the gun, the cartridge chamber 3 does not rotate. The two chambers are alternately operated and ejected.
Another form of construction of the transmission 2 for the construction of the cartridge chamber 3 is described in detail below.
As shown in fig. 4, 5, 7 and 8, the transmission mechanism 2 includes a second guide groove 23 provided on the side of the linear drive mechanism 1 facing the cartridge chamber 3, and a second projection 24 provided on the cartridge chamber 3; the second protrusion 24 extends into the second guide groove 23 and is driven by the linear driving mechanism 1 to move along the slotting path of the second guide groove 23.
When the bullet needs to be removed, an operator pulls the linear driving mechanism 1 towards the direction pointing to the rear of the gun, and due to the interaction of the second guide groove 23 and the second projection 24, the bullet chamber 3 moves transversely to the moving direction of the linear driving mechanism 1 to the bullet removing station. And continuously pulling the linear driving mechanism 1, wherein the linear driving mechanism 1 drives the ejection mechanism 4 to extend into a cavity positioned at the ejection station, and the residues in the cavity are ejected out. When the ejection is completed, the operator pushes the linear driving mechanism 1 in the direction pointing to the front of the gun, and the chamber 3 moves transversely to the direction of movement of the linear driving mechanism 1 to the working position due to the interaction of the second guiding groove 23 and the second protrusion 24.
In an alternative to this embodiment, it is preferable that,
as shown in fig. 6, the second guide groove 23 includes a third straight groove 231, an inclined groove 232, and a fourth straight groove 233 connected in sequence; the third straight groove 231 and the fourth straight groove 233 are parallel to the moving direction of the linear driving mechanism 1; the chute 232 is obliquely disposed.
When the second cam 24 is in the inclined groove 232 and moves relative to the linear drive 1, the chamber 3 moves in a direction perpendicular to the direction of movement of the linear drive 1, and when the second cam 24 is in the third straight groove 231 or the fourth straight groove 233 and moves relative to the linear drive 1, the chamber 3 does not traverse.
As shown in fig. 4 to 8, the cartridge chamber 3 in the form of the above-described transmission mechanism 2 is a traverse cartridge chamber 3. When the bullet needs to be withdrawn, the bullet chamber 3 is driven by the transmission mechanism 2 to transversely move to the bullet withdrawing station; after the bullet withdrawing is finished, the bullet chamber 3 is driven by the transmission mechanism 2 to transversely move to a working station.
The ejection mechanism 4 of the cartridge chamber 3 structure is described in detail below.
As shown in fig. 1, 2, and 4, the ejection mechanism 4 is fixed to the linear driving mechanism 1 and moves in accordance with the movement of the linear driving mechanism 1.
The ejection mechanism 4 of the cartridge chamber 3 may also take the following form.
As shown in fig. 7 and 8, the ejection mechanism 4 is separated from the linear driving mechanism 1, and when the linear driving mechanism 1 moves to contact with the ejection mechanism 4, the ejection mechanism 4 moves toward the cartridge chamber 3. The ejection mechanism 4 is arranged on the gun body 7 and is provided with an ejector rod and a spring, and two ends of the spring are respectively connected with the gun body 7 and the end part of the ejector rod far away from the gun body 7.
When the linear driving mechanism 1 contacts the ejection mechanism 4 and applies pressure to the ejection mechanism 4 towards the cartridge chamber 3, the spring is compressed, and the ejector rod extends into the chamber to eject the residue in the chamber. When the linear driving mechanism 1 moves towards the front of the gun, the spring gradually resets, and the ejector rod gradually exits from the cavity.
The ejection mechanism 4 of the rotary chamber may be configured separately from the linear drive mechanism 1.
Example 2
The present embodiment provides a firearm, and reference is made to fig. 1, fig. 2, fig. 4, fig. 5, fig. 7 and fig. 8 in the drawings of the specification.
The firearm comprises the ejection structure provided in example 1.
The firearm also comprises a barrel 6 and a frame 7, the linear drive mechanism 1 being slidably connected to the frame 7.
The firing chamber 3 of the firearm can be either a rotating chamber or a traversing firing chamber 3. As shown in fig. 1 and 2, when the cartridge chamber 3 is a rotary chamber, the frame 7 supports the cam 21. As shown in fig. 4, 5, 7 and 8, when the chamber 3 is a traversing chamber 3, the chamber 3 is slidably connected to the frame 7.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A bullet withdrawing structure is characterized by comprising a linear driving mechanism, a transmission mechanism, a bullet chamber and an ejection mechanism;
the linear driving mechanism is horizontally arranged, can move along the horizontal direction, is in transmission connection with the transmission mechanism and is used for transmitting linear driving force to the transmission mechanism;
the transmission mechanism is connected with the ammunition chamber and moves to an ammunition withdrawing station under the drive of the linear driving force;
the cartridge chamber having a chamber for containing a cartridge, the chamber being movable with the cartridge chamber to the ejection station;
the ejection mechanism is horizontally arranged and is opposite to the cavity in the ejection station, and can move towards the cavity under the driving of the linear driving mechanism so as to eject residues in the cavity in the ejection station.
2. An ejection structure according to claim 1,
the transmission mechanism comprises a cam and a first lug fixed on the linear driving mechanism, a first guide groove is formed in the outer surface of the cam, and the first lug extends into the first guide groove and moves along the slotting path of the first guide groove under the driving of the linear driving mechanism.
3. An ejection structure according to claim 2,
the first guide groove comprises a first straight groove, a spiral groove and a second straight groove which are sequentially communicated, the first straight groove is parallel to the second straight groove in parallel with the axis of the cam, and the spiral groove is obliquely arranged.
4. An ejection structure according to claim 3,
the cartridge chamber is of a single-chamber rotary chamber structure;
or,
the cartridge chamber is a double-chamber rotating chamber structure, and the end part of the cam is connected with the rotating center of the cartridge chamber through a ratchet wheel and pawl mechanism.
5. An ejection structure according to claim 1,
the transmission mechanism comprises a second guide groove arranged on the side surface, facing the cartridge chamber, of the linear driving mechanism and a second lug arranged on the cartridge chamber;
the second bump extends into the second guide groove and can move along the slotting path of the second guide groove under the drive of the linear driving mechanism.
6. An ejection structure according to claim 5,
the second guide groove comprises a third straight groove, a chute and a fourth straight groove which are connected in sequence;
the third straight groove and the fourth straight groove are parallel to the motion direction of the linear driving mechanism; the chute is obliquely arranged.
7. An ejection structure according to claim 6,
the ammunition chamber can transversely move to an ammunition withdrawing station under the drive of the transmission mechanism.
8. An ejection structure according to claim 1,
the ejection mechanism is fixed on the linear driving mechanism and can move along with the movement of the linear driving mechanism.
9. An ejection structure according to claim 1,
the ejection mechanism is separated from the linear driving mechanism, and can move towards the ammunition chamber direction after the linear driving mechanism moves to be contacted with the ejection mechanism.
10. A firearm, characterized in that it comprises a grenade structure according to any of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810869944.0A CN109210990B (en) | 2018-08-01 | 2018-08-01 | Bullet withdrawing structure and gun |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810869944.0A CN109210990B (en) | 2018-08-01 | 2018-08-01 | Bullet withdrawing structure and gun |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109210990A true CN109210990A (en) | 2019-01-15 |
| CN109210990B CN109210990B (en) | 2021-04-13 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810869944.0A Active CN109210990B (en) | 2018-08-01 | 2018-08-01 | Bullet withdrawing structure and gun |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109210990B (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2232464A (en) * | 1988-09-22 | 1990-12-12 | Rainer Achterholt | An automatic hand weapon |
| CN203772121U (en) * | 2014-03-12 | 2014-08-13 | 皮子明 | Chamber mechanism of firearm |
| CN104913683A (en) * | 2014-03-12 | 2015-09-16 | 皮子明 | Gunlock structure of gun |
-
2018
- 2018-08-01 CN CN201810869944.0A patent/CN109210990B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2232464A (en) * | 1988-09-22 | 1990-12-12 | Rainer Achterholt | An automatic hand weapon |
| CN203772121U (en) * | 2014-03-12 | 2014-08-13 | 皮子明 | Chamber mechanism of firearm |
| CN104913683A (en) * | 2014-03-12 | 2015-09-16 | 皮子明 | Gunlock structure of gun |
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| Publication number | Publication date |
|---|---|
| CN109210990B (en) | 2021-04-13 |
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