CN109412108B - Relay protection device with heat dissipation function - Google Patents
Relay protection device with heat dissipation function Download PDFInfo
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- CN109412108B CN109412108B CN201811181431.7A CN201811181431A CN109412108B CN 109412108 B CN109412108 B CN 109412108B CN 201811181431 A CN201811181431 A CN 201811181431A CN 109412108 B CN109412108 B CN 109412108B
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- fan
- relay protection
- fixed
- heat dissipation
- protection device
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/20009—Modifications to facilitate cooling, ventilating, or heating using a gaseous coolant in electronic enclosures
- H05K7/20136—Forced ventilation, e.g. by fans
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/20009—Modifications to facilitate cooling, ventilating, or heating using a gaseous coolant in electronic enclosures
- H05K7/20136—Forced ventilation, e.g. by fans
- H05K7/20172—Fan mounting or fan specifications
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- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Cooling Or The Like Of Electrical Apparatus (AREA)
Abstract
The invention discloses a relay protection device with a heat dissipation function, which comprises a relay protection shell, wherein a first fan-shaped air inlet is arranged on the upper end surface of the relay protection shell, four anti-skidding fixed supporting bottom columns are arranged on the bottom end surface of the relay protection shell, a second fan-shaped air inlet is arranged on one side of each anti-skidding fixed supporting bottom column, sliding grooves are formed in two sides of the relay protection shell, strip-shaped ventilation openings are uniformly formed in the outer sides of the sliding grooves, supporting and fixing handles are arranged on the inner sides of the sliding grooves, a wiring terminal is arranged on the front end surface of the relay protection shell, and an electronic element is arranged at the bottom end of the wiring terminal. The relay protection device is provided with a series of structures, so that the heat dissipation effect of the relay protection device is greatly enhanced, the relay protection device can well meet the working requirement, and the working efficiency of the relay protection device is greatly increased.
Description
Technical Field
The invention relates to the technical field of heat dissipation, in particular to a relay protection device with a heat dissipation function.
Background
When a power element (such as a generator, a line and the like) in a power system or the power system itself has a fault, which endangers the safe operation of the power system, an automatic measure and equipment which can send a warning signal to an operation attendant in time or directly send a tripping command to a controlled breaker to terminate the development of the events are provided, and a complete set of equipment for realizing the automatic measure is generally called a relay protection device.
However, the existing relay protection device with the heat dissipation function in the market has unsatisfactory heat dissipation condition and cannot well adapt to the working requirement, so that the working efficiency of the relay protection device is greatly reduced; therefore, the existing requirements are not met, and a relay protection device with a heat dissipation function is provided for the existing requirements.
Disclosure of Invention
The invention aims to provide a relay protection device with a heat dissipation function, and the relay protection device with the heat dissipation function is used for solving the problems that the existing relay protection device with the heat dissipation function in the market, which is provided by the background art, is not ideal in heat dissipation condition and cannot well adapt to the working requirement, so that the working efficiency of relay protection equipment is greatly reduced, and the like.
In order to achieve the purpose, the invention provides the following technical scheme that the relay protection device with the heat dissipation function comprises a relay protection shell, wherein a first fan-shaped air inlet is installed on the upper end face of the relay protection shell, an anti-skidding fixed support bottom column is installed on the bottom end face of the relay protection shell, four anti-skidding fixed support bottom columns are provided, a second fan-shaped air inlet is formed in one side of each anti-skidding fixed support bottom column, sliding grooves are formed in two sides of the relay protection shell, a long strip-shaped vent is uniformly arranged on the outer side of each sliding groove, a support fixed handle is installed on the inner side of each sliding groove, a wiring terminal is installed on the front end face of the relay protection shell, an electronic element is arranged at the bottom end of each wiring terminal, a function resilience type key is installed on one side of each wiring terminal and three, a power signal indicating lamp is installed at the upper end of each function resilience type key, a fan power switch is installed on the other side of each function resilience type key, two fan power switches are installed on the upper end of each fan power switch, an electronic display screen is installed at the upper end of each fan power switch, a fixed protection shell is internally provided with four fixed long fixing plates, four fan power signal indicating lamps are installed on the fixed cylindrical connecting rods, the bottom ends of the square connecting rods, the motor connecting plates, the square connecting plates are connected with eight connecting plates, the bottom ends of the motor connecting plates, the corresponding connecting plates are connected with a connecting disc L, and connected with a connecting disc, the corresponding connecting disc is connected with a circular fan blades, and connected with a connecting disc, the corresponding fan motor, the corresponding connecting disc is connected with a connecting disc, the corresponding fan blades, and connected with a.
Preferably, support fixed handle and include fixed connection post, square fixed button, spring, square groove and the square pole of U type, the internally mounted of fixed connection post has square fixed button, the square pole of U type is installed to fixed connection post's one end, the inside of the square pole of U type is provided with square groove, the spring is installed to square groove's inboard.
Preferably, the circuit comprises a circuit board, L type connecting sheets, first threaded holes and electronic elements, the electronic elements are mounted on the upper end face of the circuit board, L type connecting sheets are mounted on two sides of the electronic elements, the first threaded holes are formed in two ends of the L type connecting sheets, and the number of the first threaded holes is four.
Preferably, the front surface of relay protection casing is provided with the locating hole, fan switch passes through the sealing washer with relay protection casing and seals.
Preferably, the bottom face of function resilience formula button runs through the relay protection casing, the function resilience formula button passes through the buckle with the relay protection casing and is connected.
Preferably, the up end of the fixed long cylinder is completely attached to the inside of the relay protection shell, the fixed long cylinder is connected with the relay protection shell in a welding mode, the bottom end face of the fixed long cylinder penetrates through the circuit board, and the fixed long cylinder is connected with the circuit board through internal threads.
Preferably, the upper end face of the anti-skidding fixed support bottom column is completely attached to the bottom end face of the relay protection shell, and the anti-skidding fixed support bottom column is connected with the relay protection shell in a welding mode.
Preferably, one end of the square connecting fixing block is completely attached to the outer surface of the fixed circular sheet, and the square connecting fixing block is connected with the fixed circular sheet through an adhesive.
Preferably, the one end of fixed connection post is laminated completely with the one end of the square pole of U type, fixed connection post passes through welded connection with the square pole of U type.
Preferably, the bottom end face of the L type connecting piece is completely attached to the upper end face of the circuit, and the L type connecting piece is connected with the circuit through a screw.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the invention, the anti-skid fixed support bottom posts 15 are arranged on the bottom end surface of the relay protection shell, the number of the anti-skid fixed support bottom posts is four, the second fan-shaped air inlet is formed in one side of each anti-skid fixed support bottom post, and the strip-shaped ventilation openings are uniformly formed in the outer side of the sliding groove, so that cold air can be introduced from the bottom of the relay protection shell when the fan is opened, and hot air is discharged out of the relay protection shell from the strip-shaped ventilation openings.
2. According to the invention, the wiring terminal is arranged on the front end face of the relay protection shell, the electronic element is arranged at the bottom end of the wiring terminal, the functional resilience type buttons are arranged on one side of the wiring terminal, the number of the functional resilience type buttons is three, the power signal indicator lamps are arranged at the upper ends of the functional resilience type buttons, the number of the power signal indicator lamps is three, the fan power switch is arranged on the other side of the functional resilience type button, the number of the fan power switches is two, and the electronic display screen is arranged at the upper end of the fan power switch, so that the interface is clear at a glance, and different selections can be made according to.
3. According to the invention, the upper end and the lower end of the circuit are respectively provided with the ventilating fan, the ventilating fan comprises L type fan blades, round connecting plates, a motor, a fixed connecting rod, fixed round pieces, eight square connecting fixed blocks and second threaded holes, the fixed connecting rods are uniformly arranged on the outer side of the motor, the round connecting plates are arranged at the bottom end of the motor, L type fan blades are uniformly arranged on the outer side of the round connecting plates, ten L type fan blades are arranged, the square connecting fixed blocks are arranged on the outer side of the L type fan blades, the square connecting fixed blocks are arranged on the outer side of the fixed round pieces, the number of the square connecting fixed blocks is four, and the second threaded holes are formed in the upper surface of the square connecting fixed blocks.
4. According to the invention, the supporting and fixing handle is arranged on the inner side of the sliding groove, the supporting and fixing handle comprises the fixing connecting column, the square fixing button, the spring, the square groove and the U-shaped square rod, the square fixing button is arranged inside the fixing connecting column, the U-shaped square rod is arranged at one end of the fixing connecting column, the square groove is arranged inside the U-shaped square rod, the spring is arranged on the inner side of the square groove, and the device can be very stable in movement through the supporting and fixing handle.
5. According to the invention, the circuit is arranged at the bottom end of the fixed long cylinder and comprises the circuit board, the L-type connecting sheets, the first threaded holes and the electronic elements, the electronic elements are arranged on the upper end surface of the circuit board, the L-type connecting sheets are arranged on two sides of the electronic elements, the first threaded holes are arranged at two ends of the L-type connecting sheets, and the number of the first threaded holes is four, so that the contact area between the circuit and air is larger, and the heat dissipation effect is better.
Drawings
FIG. 1 is a schematic overall structure of the present invention;
FIG. 2 is a side view of the present invention;
FIG. 3 is a schematic structural diagram of the front side of the present invention;
FIG. 4 is a schematic view of the structure of the half-section side of the present invention;
FIG. 5 is a schematic structural view of a half-section front face of the present invention;
FIG. 6 is a schematic view of a partial structure of a ventilating fan according to the present invention;
FIG. 7 is a partial half sectional view of the stationary handle of the present invention;
FIG. 8 is a schematic view of the wind direction flow of the present invention.
In the drawing, the device comprises a relay protection shell 1, a wiring terminal 2, a functional resilience type key 3, a wind power signal indicator lamp 4, a fan power switch 5, an electronic display screen 6, a supporting and fixing handle 7, a ventilating fan 8, a circuit board 9, a circuit 10, a circuit 11, a sliding groove 12, a long strip-shaped ventilation opening 13, a first fan-shaped air inlet 14, a second fan-shaped air inlet 15, an anti-skidding and fixing supporting bottom column 16, L type fan blades 17, a circular connecting disc 18, a motor 19, a fixing connecting rod 20, a fixing circular sheet 21, a fixing connecting column 22, a fixing long cylinder 23, a connecting sheet L24, a first threaded hole 24, an electronic element 25, a square connecting and fixing block 26, a second threaded hole 27, a square fixing button 28, a square fixing button 29, a spring 30, a square groove 31 and a U-shaped square rod.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
Referring to fig. 1-8, an embodiment of the invention provides a relay protection device with a heat dissipation function, which includes a relay protection housing 1, a first fan-shaped air inlet 13 is installed on an upper end surface of the relay protection housing 1, an anti-slip fixed support bottom column 15 is installed on a bottom end surface of the relay protection housing 1, four anti-slip fixed support bottom columns 15 are provided, a second fan-shaped air inlet 14 is provided on one side of the anti-slip fixed support bottom column 15, so that cold air can smoothly enter the device, thereby achieving a cooling effect, sliding grooves 11 are provided on both sides of the relay protection housing 1, elongated ventilation openings 12 are uniformly provided on an outer side of the sliding grooves 11, a support fixed handle 637 is installed on an inner side of the sliding grooves 11, a wiring terminal 2 is installed on a front end surface of the relay protection housing 1, an electronic element 25 is provided on a bottom end of the wiring terminal 2, a function resilient button 3 is installed on one side of the wiring terminal 2, three function resilient buttons 3 are provided, a power signal indicator lamp 4 is installed on an upper end of the function resilient button 3, three buttons 3, a power signal indicator lamp 4 is installed on an upper end of the function resilient button 3, a power switch 5, a power switch 3, a power switch 5 is provided with two fan switch 3, a connecting rod is installed on a circular fan switch 19, a connecting rod for connecting the power switch connecting the fan 20, a circular fan 18, a connecting rod, a circular fan connecting rod, a connecting rod connecting with a circular fan 19, a circular fan 18, a circular fan 19, a circular fan 17, a circular fan connecting rod connecting with a circular fan 18, a circular fan fixing fan 17, a circular fan 19, a circular fan fixing plate 18, a circular fan fixing plate 19, a circular fan fixing plate 18, a circular fan.
Further, support fixed handle 7 and include fixed connection post 21, square fixed button 28, spring 29, square groove 30 and the square pole 31 of U type, the internally mounted of fixed connection post 21 has square fixed button 28, the square pole 31 of U type is installed to the one end of fixed connection post 21, the inside of the square pole 31 of U type is provided with square groove 30, spring 29 is installed to the inboard of square groove 30, support fixed handle 21 and make the device can be very steady in the motion.
Further, the circuit 10 includes circuit board 9, L type connection piece 23, first screw hole 24 and electronic component 25, and electronic component 25 is installed to the up end of circuit board 9, and L type connection piece 23 is installed to electronic component 25's both sides, and the both ends of L type connection piece 23 are provided with first screw hole 24, and first screw hole 24 has four for the area of contact of circuit 10 and air is bigger, thereby makes the radiating effect better.
Furthermore, the front surface of the relay protection shell 1 is provided with a positioning hole, and the fan power switch 5 and the relay protection shell 1 are sealed through a sealing ring, so that the device is more convenient to work in the field.
Further, the bottom face of function resilience formula button 3 runs through relay protection casing 1, and function resilience formula button 3 passes through the buckle with relay protection casing 1 and is connected, makes the order responded to at once through function resilience formula button 3.
Further, the up end of fixed long cylinder 22 is laminated with relay protection casing 1's inside completely, and fixed long cylinder 22 passes through welded connection with relay protection casing 1, and circuit board 9 is run through to the bottom face of fixed long cylinder 22, and fixed long cylinder 22 passes through female connection with circuit board 9 for circuit board 9's contact air's area is bigger.
Further, the upper end face of the anti-skidding fixed support bottom column 15 is completely attached to the bottom end face of the relay protection shell 1, and the anti-skidding fixed support bottom column 15 is connected with the relay protection shell 11 in a welding mode, so that the device can prevent skidding.
Further, the one end of square connection fixed block 26 and the surface of fixed circular slice 20 laminate completely, and square connection fixed block 26 passes through the adhesive with fixed circular slice 20 and is connected for it is more firm to connect.
Further, the one end of fixed connection post 21 is laminated completely with the one end of U type square pole 31, and fixed connection post 21 passes through welded connection with U type square pole 31 for the device can be the air contact of bigger area when passing through U type square pole 31
Furthermore, the bottom end surface of the L-type connecting sheet 23 is completely attached to the upper end surface of the circuit 10, and the L-type connecting sheet 23 is connected with the circuit 10 through screws, so that the connection between the circuit 10 and the relay protection casing 1 is firmer.
When the device is used, the device is moved to a working area through the supporting and fixing handle 7, the supporting and fixing handle 7 moves circularly around the fixing connecting column 21 and moves to a proper position, the device is fixed on the ground through pressing the square fixing button 28, a power supply is switched on, the fan power switch 5 on the front surface of the relay protection shell 1 is switched on, the ventilating fan 8 on the upper end and the lower end of the circuit 10 starts to work, the L-type fan blades 16 on the outer surface of the circular connecting disc 17 start to rotate, cold air starts to enter the relay protection shell 1 from the first fan-shaped air inlet 13 on the upper surface of the relay protection shell 1, the cold air starts to enter the relay protection shell 1 from the second fan-shaped air inlet 14 on the lower end surface of the relay protection shell 1, heat emitted by the circuit 10 is taken away, hot air flows out from the strip-shaped air vents 12 on the two sides of the relay protection shell 1, the cooling effect is achieved, and the cooling effect is greatly increased due to the double-layer ventilating 8 of the fan.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (9)
1. The utility model provides a relay protection device of heat dissipation function, including relay protection casing (1), its characterized in that the up end of relay protection casing (1) is installed first fan-shaped air intake (13), the bottom face of relay protection casing (1) is installed anti-skidding fixed support sill pillar (15), anti-skidding fixed support sill pillar (15) have four, one side of anti-skidding fixed support sill pillar (15) is provided with fan-shaped air intake (14) of second, the both sides of relay protection casing (1) all are provided with sliding groove (11), the outside of sliding groove (11) is even is provided with rectangular shape vent (12), the inboard of sliding groove (11) is installed and is supported fixed handle (7), binding post (2) is installed to the preceding terminal surface of relay protection casing (1), the bottom of binding post (2) is provided with electronic component (25), one side of binding post (2) is installed with function resilience formula button (3), function resilience formula button (3) is three button (3), function resilience formula button (3) has three button (3), power signal indicator lamp (4) is installed to the upper end of function button (3), power signal indicator lamp (3), the fixed button (24) is installed the connection terminal (24), the connection terminal (24) is equipped with the connection terminal (24), the connection terminal (24) of the fan screw hole (18) of the fixed terminal (24), the fan screw hole (18) is equipped with the circular screw hole (24), the fan 20), the fixed terminal of fan 20), the fixed terminal, the fan 20), the fixed terminal of the fan 20), the fan 20) is connected with the fan, the circular screw hole (24), the fan 20), the fixed terminal of the fan 20), the fan 20 is connected with the fan 20, the fixed terminal of the fan 20, the fan 20 is installed on the fan 20, the fixed terminal of the fixed switch of the circular screw hole of the fan 20, the fixed switch of the fan 20, the fan 20 is installed on the fixed switch of the fan, the fan 20, the fan screw hole of the fan 20 is installed on the fan 20, the fixed switch of the fan 20, the fan 20 of the fixed switch of the fan 20, the fixed switch of the fan 20 of the.
2. The relay protection device with the heat dissipation function according to claim 1, wherein: support fixed handle (7) including fixed connection post (21), square fixed button (28), spring (29), square groove (30) and the square pole of U type (31), the internally mounted of fixed connection post (21) has square fixed button (28), the square pole of U type (31) is installed to the one end of fixed connection post (21), the inside of the square pole of U type (31) is provided with square groove (30), spring (29) are installed to the inboard of square groove (30).
3. The relay protection device with the heat dissipation function according to claim 1, wherein: the front surface of the relay protection shell (1) is provided with a positioning hole, and the fan power switch (5) and the relay protection shell (1) are sealed through a sealing ring.
4. The relay protection device with the heat dissipation function according to claim 1, wherein: the bottom end face of the function resilience type key (3) penetrates through the relay protection shell (1), and the function resilience type key (3) is connected with the relay protection shell (1) through a buckle.
5. The relay protection device with the heat dissipation function according to claim 1, wherein: the up end of fixed long cylinder (22) laminates with the inside of relay protection casing (1) completely, fixed long cylinder (22) passes through welded connection with relay protection casing (1), the bottom face of fixed long cylinder (22) runs through circuit board (9), fixed long cylinder (22) passes through female connection with circuit board (9).
6. The relay protection device with the heat dissipation function according to claim 1, wherein: the anti-skidding protective housing is characterized in that the upper end face of the anti-skidding fixed support bottom column (15) is completely attached to the bottom end face of the protective housing (1), and the anti-skidding fixed support bottom column (15) is connected with the protective housing (1) in a welding mode.
7. The relay protection device with the heat dissipation function according to claim 1, wherein: one end of the square connecting fixing block (26) is completely attached to the outer surface of the fixed circular sheet (20), and the square connecting fixing block (26) is connected with the fixed circular sheet (20) through an adhesive.
8. The relay protection device with the heat dissipation function according to claim 2, wherein: the one end of fixed connection post (21) is laminated with the one end of the square pole of U type (31) completely, fixed connection post (21) passes through welded connection with the square pole of U type (31).
9. The relay protection device with the heat dissipation function according to claim 1, wherein the bottom end surface of the L-type connecting piece (23) is completely attached to the upper end surface of the circuit (10), and the L-type connecting piece (23) is connected to the circuit (10) through screws.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811181431.7A CN109412108B (en) | 2018-10-11 | 2018-10-11 | Relay protection device with heat dissipation function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811181431.7A CN109412108B (en) | 2018-10-11 | 2018-10-11 | Relay protection device with heat dissipation function |
Publications (2)
| Publication Number | Publication Date |
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| CN109412108A CN109412108A (en) | 2019-03-01 |
| CN109412108B true CN109412108B (en) | 2020-07-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201811181431.7A Active CN109412108B (en) | 2018-10-11 | 2018-10-11 | Relay protection device with heat dissipation function |
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| CN (1) | CN109412108B (en) |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU2002953498A0 (en) * | 2002-12-20 | 2003-01-09 | Integrated Electronic Solutions Pty Ltd | Relay contact protection |
| CN101965114B (en) * | 2010-08-30 | 2012-07-04 | 华为技术有限公司 | Locking mechanism of communication module and communication equipment |
| CN205645684U (en) * | 2016-05-30 | 2016-10-12 | 江苏正启电气有限公司 | Novel relay housing body |
| CN205880158U (en) * | 2016-08-15 | 2017-01-11 | 华电湖北发电有限公司黄石热电厂 | Microcomputer heavy current relay protection inspects appearance |
| CN206685683U (en) * | 2017-03-21 | 2017-11-28 | 湖南二木新能源科技有限公司 | A kind of Ultra-silent terminal |
| CN206685881U (en) * | 2017-04-25 | 2017-11-28 | 科润电力科技股份有限公司 | A kind of satellite protective relaying device for being easy to radiating |
| CN107249290A (en) * | 2017-08-15 | 2017-10-13 | 李中秒 | One kind is used for protector described in hosiery machine |
| CN107477731A (en) * | 2017-09-24 | 2017-12-15 | 广州酷刻科技有限公司 | A kind of domestic purification airdryer |
| CN107947318A (en) * | 2017-10-20 | 2018-04-20 | 合肥成科电子科技有限公司 | A kind of controller for solar of quick heat radiating |
| CN108167786A (en) * | 2017-12-25 | 2018-06-15 | 铜陵迈维电子科技有限公司 | A kind of LED startup power supplies of high temperature-proof |
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2018
- 2018-10-11 CN CN201811181431.7A patent/CN109412108B/en active Active
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Effective date of registration: 20200611 Address after: 225300 Industrial Park, Yongan Town, high port area, Taizhou, Jiangsu Applicant after: TAIZHOU BOTAI ELECTRONICS Co.,Ltd. Address before: 225300 Jiangsu Province Taizhou Gaogang District Yongan Zhou Town Xingzhou Huayuan District 29 Building 10 Applicant before: Liu Zhao |
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