CN108827061A - A kind of glueballs ball collector having automatic detection glueballs quantity - Google Patents
A kind of glueballs ball collector having automatic detection glueballs quantity Download PDFInfo
- Publication number
- CN108827061A CN108827061A CN201810447637.3A CN201810447637A CN108827061A CN 108827061 A CN108827061 A CN 108827061A CN 201810447637 A CN201810447637 A CN 201810447637A CN 108827061 A CN108827061 A CN 108827061A
- Authority
- CN
- China
- Prior art keywords
- glueballs
- photoelectric sensor
- pair
- ball collector
- ball
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- 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.)
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
- F28G1/00—Non-rotary, e.g. reciprocated, appliances
- F28G1/12—Fluid-propelled scrapers, bullets, or like solid bodies
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
- F28G15/00—Details
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
- F28G15/00—Details
- F28G15/003—Control arrangements
Abstract
The invention belongs to thermal power generation cold end optimisation technique field, a kind of glueballs ball collector having automatic detection glueballs quantity.It is characterized in that including glueballs ball collector ontology, strainer, electronic receipts ball valve, display controller, first pair of photoelectric sensor adjuster, second pair of photoelectric sensor adjuster, first pair of photoelectric sensor and second pair of photoelectric sensor.The glueballs ball collector ontology is hollow cylindrical structure, and upper end is equipped with sealing cover, the fixed display controller of lateral wall, glueballs ball collector entrance and the outlet of glueballs ball collector；Relatively diametrically position is equipped with glueballs ball collector entrance and ball room exports for glueballs ball collector ontology two sidewalls, and glueballs ball collector entrance is located at glueballs ball collector body upper part, and the outlet of glueballs ball collector is located at the lower part of glueballs ball collector ontology.The function of the monitoring to glueballs quantity has may be implemented in the present invention, there is that low in cost, structure is simple, high degree of automation, can be adapted for power station or other related fieldss of any circulating water quality.
Description
Technical field
The invention belongs to thermal power generation cold end optimisation technique fields, are related to a kind of glueballs for having automatic detection glueballs quantity
Ball collector can have automatic detection glueballs quantity applied to thermal power plant.
Background technique
Water-cooled condenser is still widely present in modern power station, but due to cycle water and problem of oxidation, unit
After condenser tube bank is internal when running certain will fouling.In order to keep the clean conditions inside bank of condenser pipes, need
It is frequently utilized that condenser condenser pipe cleaning glueballs carries out periodic cleaning to it.Glueballs ball collector is one of important component.
Main function of the glueballs ball collector in rubber ball cleaning system for steam condenser is filling glueballs, and in addition some glueballs ball collector tops fill
There is transparent class visual window, the substantially operating condition of glueballs can be checked for operations staff, such as when glueballs pump shutdown, it can
Manually to check in glueballs ball collector the height for collecting glueballs, so that estimating the number of glueballs in rubber ball cleaning system for steam condenser is
No full system needs.However, in the power station of some cycle waters muddiness, it can band when manually checking glueballs in above-mentioned glueballs ball collector
Carry out inconvenience, or even can not check, and uses and manually check that the operating condition of glueballs is also unable to satisfy power station automation life
The growing demand produced.
It is on-line automatic clear that Chinese patent Authorization Notice No. is that CN204214337U discloses a kind of energy-saving condenser ball
The ball collector of cleaning device, including upper housing and lower case, the side of upper housing are equipped with glueballs putting hole, and glueballs putting hole is located at upper
The intracorporal one end of shell is equipped with check valve plate；It is equipped in upper housing positioned at the lower section of glueballs putting hole and puts net, put the top of net
Equipped with goal buffer unit；The lower section for putting net is equipped with rotation switching valve, and rotation switching valve includes the valve that top is provided with goal hole
Shell, valve chest is interior to be equipped with columnar switching spool, and the lower end for switching spool connects with the intracorporal glueballs delivery line of lower casing is located at,
Drive shaft is divided into left half and right half.It mainly improves ball collecting rate, reduces noise when glueballs dress ball.
Summary of the invention
It is an object of the invention to overcome existing technological deficiency, a kind of glueballs that can automatically detect glueballs quantity is provided
Ball collector increases the degree of automation of production.
Technical solution of the present invention：
A kind of glueballs ball collector having automatic detection glueballs quantity, including glueballs ball collector ontology, strainer, electronic receipts ball
Valve, electronic receipts ball valve control motor, display controller, first pair of photoelectric sensor adjuster, second pair of photoelectric sensor are adjusted
Device, first pair of photoelectric sensor and second pair of photoelectric sensor.
The glueballs ball collector ontology is hollow cylindrical structure, upper end fixing seal lid, the fixed display control of lateral wall
Device, glueballs ball collector entrance and the outlet of glueballs ball collector；Glueballs ball collector body interior has strainer；It is installed at strainer lower ending opening
Electronic receipts ball valve；Electronic receipts ball valve is connect with the electronic receipts ball valve control motor for being mounted on glueballs ball collector body exterior；Glueballs
The fixed glueballs ball collector entrance of ball collector outer body wall and the outlet of glueballs ball collector, glueballs ball collector entrance are located at glueballs dress ball
Room body upper part, the outlet of glueballs ball collector are located at the lower part of glueballs ball collector ontology；Glueballs ball collector outer body wall is in height
H1First pair of transparent window is arranged along cross section radial symmetric in place, in height H2Place is arranged second pair thoroughly along cross section radial symmetric
Photopic vision window, wherein H1>H2；
First pair of photoelectric sensor adjuster and second pair of photoelectric sensor adjuster are separately positioned on first pair of transparent view
On window and second pair of transparent window；First pair of photoelectric sensor built in first pair of photoelectric sensor adjuster, second pair of photoelectric transfer
Second pair of photoelectric sensor built in sensor adjuster；First pair of photoelectric sensor and second pair of photoelectric sensor and display controller
Connection.
Further, photoelectric sensor adjuster includes photoelectric sensor governor body, manual adjustment rod and scale；Light
Electric transducer governor body is fixed on transparent window, and the photoelectric sensor uses fibre-optical probe, and fibre-optical probe is fixed
In manual adjustment rod one end, it is integrally placed in photoelectric sensor governor body；The manual adjustment rod other end passes through photoelectric sensing
Device governor body is equipped with the side wall of scale, and manual adjustment rod drives fibre-optical probe to move up and down along transparent window, passes through scale
Check mobile height；Fibre-optical probe is connect by optical fiber with display controller.
First pair of transparent window and second pair of transparent window use transparent material；The transparent material is organic glass
Glass.First pair of photoelectric sensor and second pair of photoelectric sensor use optoelectronic switch.The display controller uses monolithic
The additional generic liquid crystal screen of machine or the additional generic liquid crystal screen of PLC.
A kind of glueballs ball collector can automatically detect glueballs quantity detects the control method of glueballs quantity automatically, and step is such as
Under：
Step 1：Electronic receipts ball valve control motor is controlled, ball collector is set and receives spherical state, receive after ball exercise makees M minutes,
When glueballs quantity is not further added by, stoppage in transit Rubber ball pump does not reinject glueballs；
Step 2：
Situation 1, the signal that first pair of photoelectric sensor issues can be received by corresponding photoelectric sensor, and second pair of light
The signal that electric transducer issues is received by corresponding photoelectric sensor, then glueballs lazy weight in display controller judgement system,
And state at this time is prompted on its display screen or issues the state to other devices；
Situation 2, the signal that first pair of photoelectric sensor issues is received by corresponding photoelectric sensor, and second pair of photoelectric transfer
The signal that sensor issues is not received by corresponding photoelectric sensor, then glueballs quantity is being just in the display controller judgement system
Often, and on its display screen it prompts state at this time or issues the state to other devices；
Situation 3, the signal that first pair of photoelectric sensor issues is not received by corresponding photoelectric sensor, and second pair of light
The signal that electric transducer issues is not received by corresponding photoelectric sensor, then glueballs quantity in the display controller judgement system
Abundance, and prompt on its display screen state at this time or issue the state to other devices.
Beneficial effects of the present invention：The glueballs ball collector for having automatic detection glueballs quantity, which utilizes, to be set on its side wall
Two pairs of photoelectric sensors realize the automatic detection to glueballs quantity by judging the state of photoelectric sensor.Cost of the present invention
Cheap, structure is simple, high degree of automation, can be adapted for power station or other related fieldss of any circulating water quality.
Detailed description of the invention
Fig. 1 is external structure schematic diagram of the invention.
Fig. 2 is front view of the invention.
Fig. 3 is diagrammatic cross-section of the invention.
Fig. 4 is the external structure schematic diagram of photoelectric sensor adjuster of the invention.
Fig. 5 is photoelectric sensor adjuster the schematic diagram of the section structure of the invention.
In figure：1 glueballs ball collector ontology；1.1 glueballs ball collector entrances；The outlet of 1.2 glueballs ball collectors；1.3 electronic receipts balls
Valve control motor；1.4 electronic receipts ball valves；1.5 strainer；
2 display controllers；
3.1 first pairs of photoelectric sensor adjusters；3.2 second pairs of photoelectric sensor adjusters；
4.1 first pairs of transparent windows；4.2 second pairs of transparent windows；
5.1 first pairs of photoelectric sensors；5.2 second pairs of photoelectric sensors；
6 photoelectric sensor governor bodies；6.1 manual adjustment rod；6.2 scale；
7 optical fiber；
8 fibre-optical probes.
Specific embodiment
Specific embodiments of the present invention are described in detail below in conjunction with technical solution and attached drawing.
Below with reference to Fig. 1~2 the specific structure and work process that the present invention will be described in detail, as shown in Figure 1, one kind has certainly
The glueballs ball collector of dynamic detection glueballs quantity, including 2, first pairs of glueballs ball collector ontology 1, display controller photoelectric sensor tune
Save 3.1, second pairs of device, 3.2, first pairs of photoelectric sensor adjuster photoelectric sensor 5.1 and second pair of photoelectric sensor 5.2.
The glueballs ball collector ontology 1 is hollow cylindrical structure, upper end fixing seal lid, the fixed display control of lateral wall
Device 2, glueballs ball collector entrance 1.1 and glueballs ball collector outlet 1.2；Strainer 1.5 is located inside glueballs ball collector ontology 1；Strainer
Electronic receipts ball valve 1.4 is installed at 1.5 lower ending openings；Electronic receipts ball valve 1.4 be mounted on it is electronic outside glueballs ball collector ontology 1
Ball valve control motor 1.3 is received to connect；Relatively diametrically glueballs ball collector entrance is fixed in position to 1 lateral wall of glueballs ball collector ontology
1.1 and glueballs ball collector outlet 1.2, glueballs ball collector entrance 1.1 is located at 1 top of glueballs ball collector ontology, and glueballs ball collector goes out
Mouth 1.2 is located at the lower part of glueballs ball collector ontology 1.1 lateral wall of glueballs ball collector ontology is in height H1Place is diametrically symmetrical arranged
First pair of transparent window 4.1, in height H2Place is diametrically symmetrical arranged second pair of transparent window 4.2, wherein H1>H2, H1、H2With
Pedestal is measuring basis.
First pair of photoelectric sensor adjuster 3.1 and second pair of photoelectric sensor adjuster 3.2 are separately positioned on first pair
On transparent window 4.1 and second pair of transparent window 4.2；First pair of photoelectric sensing built in first pair of photoelectric sensor adjuster 3.1
Device 5.1, second pair of photoelectric sensor 5.2 built in second pair of photoelectric sensor adjuster 3.2.First pair of 5.1 He of photoelectric sensor
Second pair of photoelectric sensor 5.2 is connect with display controller 2.
Further, the photoelectric sensor adjuster includes photoelectric sensor governor body 6, manual adjustment rod
6.1 and scale 6.2；Photoelectric sensor governor body 6 is fixed on transparent window；The photoelectric sensor is visited using optical fiber
First 8, fibre-optical probe 8 is fixed on 6.1 one end of manual adjustment rod, is integrally placed in photoelectric sensor governor body 6；It manually adjusts
6.1 other end of bar passes through the side wall that photoelectric sensor governor body 6 is equipped with scale 6.2, and manual adjustment rod 6.1 drives optical fiber to visit
First 8 move up and down along transparent window, check mobile height by scale 6.2；Fibre-optical probe 8 passes through optical fiber 7 and display controller 2
Connection.
First pair of transparent window 4.1 and second pair of transparent window 4.2 are made of organic glass or other transparent materials.
First pair of photoelectric sensor 5.1 and second pair of photoelectric sensor 5.2 can be constituted using general optoelectronic switch, such as
HPX-T1.The display controller 2 can be made of general single chip or PLC, additional generic liquid crystal screen.
In order to make the present invention reach the function of automatic monitoring and supplement glueballs, when using the device for the first time, need to first
Height to photoelectric sensor adjuster 3.1 and second pair of photoelectric sensor adjuster 3.2 apart from ground is corrected, specifically
Antidote is as follows：
Step 1, for the first time use the device when, manually by N1A glueballs, which is put into glueballs ball collector ontology 1, to be impregnated 24 hours,
Expand glueballs sufficiently in water.N1Allow the maximum glueballs quantity put into for glueballs ball collector ontology 1.
Step 2 manually adjusts manual adjustment rod 6.1 on first pair of photoelectric sensor adjuster 3.1, makes first pair of photoelectricity
Height of the sensor 5.1 apart from ground is located at top layer glueballs at 1~2cm under ground level, and makes first pair of photoelectricity
The signal that sensor 5.1 issues can not be received by first pair of photoelectric sensor 5.1.
Step 3 takes out N2A glueballs (N2≈N1× 2/3), make the height decline that glueballs is accumulated in glueballs ball collector ontology 1,
Then the manual adjustment rod 6.1 for adjusting second pair of 5.2 adjuster of photoelectric sensor, makes second pair of photoelectric sensor 5.2 apart from ground
The height in face is located at top layer glueballs at 1~2cm under ground level, and issues first pair of photoelectric sensor 5.1
Signal can not be received by first pair of photoelectric sensor 5.1.
In order to make the present invention reach the function of automatic monitoring and supplement glueballs, control method is as follows：
Step 1：Rubber ball cleaning system receive after ball exercise makees M minute, M according to the determination of the operating condition of actual set, and
When glueballs quantity is not further added by, stoppage in transit Rubber ball pump.
Step 2：
Situation 1, the signal that first pair of photoelectric sensor 5.1 issues can be received by corresponding photoelectric sensor, and second
The signal issued to photoelectric sensor 5.2 can also be received by corresponding photoelectric sensor, then in 2 judgement system of display controller
Glueballs lazy weight, and prompt on its display screen state at this time or issue the state to other devices.
Situation 2, the signal that first pair of photoelectric sensor 5.1 issues can be received by corresponding photoelectric sensor, and second
The signal issued to photoelectric sensor 5.2 can not be received by corresponding photoelectric sensor, then the judgement of display controller 2 system
Glueballs quantity is normal in system, and prompts on its display screen state at this time or issue the state to other devices.
Situation 3, the signal that first pair of photoelectric sensor 5.1 issues can not be received by corresponding photoelectric sensor, and
The signal that second pair of photoelectric sensor 5.2 issues can not be received by corresponding photoelectric sensor, then the display controller 2 is sentenced
Glueballs quantity is sufficient in disconnected system, and prompts on its display screen state at this time or issue the state to other devices.
Claims (3)
1. a kind of glueballs ball collector for having automatic detection glueballs quantity, including glueballs ball collector ontology (1), display controller
(2), photoelectric sensor adjuster, photoelectric sensor；Glueballs ball collector ontology (1) is hollow cylindrical structure, upper end fixing seal
Lid, lateral wall fixed display controller (2), glueballs ball collector entrance (1.1) and glueballs ball collector outlet (1.2)；Glueballs dress
Ball chamber inlet (1.1) is located at glueballs ball collector ontology (1) top, and glueballs ball collector outlet (1.2) is located at glueballs ball collector ontology
(1) lower part；Glueballs ball collector body interior has strainer, the electronic receipts ball valve of installation at strainer lower ending opening；Electronic receipts ball valve with
It is mounted on the electronic receipts ball valve control motor connection of glueballs ball collector body exterior；It is characterized in that,
First pair of transparent window (4.1) is arranged along cross section radial symmetric at height H1 in glueballs ball collector ontology (1) lateral wall,
In height H2Second pair of transparent window (4.2) is arranged along cross section radial symmetric in place, wherein H1>H2, H1、H2It is measurement with pedestal
Benchmark；
First pair of photoelectric sensor adjuster (3.1) and second pair of photoelectric sensor adjuster (3.2) are separately positioned on first pair
On the outside of transparent window (4.1) and second pair of transparent window (4.2)；First pair built in first pair of photoelectric sensor adjuster (3.1)
Photoelectric sensor (5.1), second pair of photoelectric sensor (5.2) built in second pair of photoelectric sensor adjuster (3.2)；First pair of light
Electric transducer (5.1) and second pair of photoelectric sensor (5.2) connect with display controller (2).
2. a kind of glueballs ball collector for having automatic detection glueballs quantity as described in claim 1, which is characterized in that described
Photoelectric sensor adjuster includes photoelectric sensor governor body (6), manual adjustment rod (6.1) and scale (6.2)；Photoelectric transfer
Sensor governor body (6) is fixed on transparent window；The photoelectric sensor uses fibre-optical probe (8), fibre-optical probe (8)
It is connect by optical fiber (7) with display controller (2)；Fibre-optical probe (8) is fixed on manual adjustment rod (6.1) one end, is integrally placed at
In photoelectric sensor governor body (6)；Manual adjustment rod (6.1) other end passes through photoelectric sensor governor body (6) and sets
There is the side wall of scale (6.2), manual adjustment rod (6.1) drives fibre-optical probe (8) to move up and down along transparent window, passes through scale
(6.2) mobile height is checked.
3. the control method that glueballs ball collector as claimed in claim 1 or 2 detects glueballs quantity automatically, which is characterized in that including step
It is rapid as follows：
Step 1：Electronic receipts ball valve control motor (1.3) is controlled, ball collector is set and receives spherical state, receipts ball exercise is carried out and makees M minutes
Afterwards, when glueballs quantity is not further added by, stoppage in transit Rubber ball pump does not reinject glueballs；
Step 2：
Situation 1, the signal that first pair of photoelectric sensor (5.1) issues can be received by corresponding photoelectric sensor, and second pair
The signal that photoelectric sensor (5.2) issues is received by corresponding photoelectric sensor, then glueballs in display controller (2) judgement system
Lazy weight, and prompt on its display screen state at this time or issue the state to other devices；
Situation 2, the signal that first pair of photoelectric sensor (5.1) issues is received by corresponding photoelectric sensor, and second pair of photoelectricity
The signal that sensor (5.2) issues is not received by corresponding photoelectric sensor, then glue in display controller (2) the judgement system
Ball quantity is normal, and prompts on its display screen state at this time or issue the state to other devices；
Situation 3, the signal that first pair of photoelectric sensor (5.1) issues are not received by corresponding photoelectric sensor, and second pair
The signal that photoelectric sensor (5.2) issues is not received by corresponding photoelectric sensor, then the display controller (2) judges system
Middle glueballs quantity is sufficient, and prompts on its display screen state at this time or issue the state to other devices.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810447637.3A CN108827061B (en) | 2018-05-11 | 2018-05-11 | A kind of glueballs ball collector having automatic detection glueballs quantity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810447637.3A CN108827061B (en) | 2018-05-11 | 2018-05-11 | A kind of glueballs ball collector having automatic detection glueballs quantity |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108827061A true CN108827061A (en) | 2018-11-16 |
| CN108827061B CN108827061B (en) | 2019-08-09 |
Family
ID=64147961
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810447637.3A Expired - Fee Related CN108827061B (en) | 2018-05-11 | 2018-05-11 | A kind of glueballs ball collector having automatic detection glueballs quantity |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108827061B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114018087A (en) * | 2021-12-17 | 2022-02-08 | 蒋杰玉 | Centralized ball serving device capable of recycling rubber balls |
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| DE3316022C1 (en) * | 1983-03-17 | 1984-08-30 | Taprogge GmbH, 4000 Düsseldorf | Method and arrangement for monitoring the operability of a device for cleaning the pipes of a power plant condenser system or the like. |
| KR20050008214A (en) * | 2003-07-14 | 2005-01-21 | 두산중공업 주식회사 | System and Method of Measuring Cleaning Balls in the Condenser Tube Cleaning System of the Power Plant |
| CN101476838A (en) * | 2009-01-16 | 2009-07-08 | 沈阳工程学院 | Electric power plant condenser ball cleaning on-line monitoring device based on optical fiber sensing technology |
| CN102628659A (en) * | 2012-04-09 | 2012-08-08 | 清华大学 | Rubber ball washing monitoring device |
| CN104266537A (en) * | 2014-10-14 | 2015-01-07 | 沈阳工程学院 | Power plant condenser rubber ball cleaning online monitoring device |
| CN204694149U (en) * | 2015-06-11 | 2015-10-07 | 沈阳工程学院 | A kind of high accuracy glueballs monitoring device |
| US9835393B2 (en) * | 2012-09-20 | 2017-12-05 | Jeongwoo Industrial Machine Co., Ltd. | Apparatus for circulating balls for cleaning a pipe line |
| CN207095386U (en) * | 2017-06-07 | 2018-03-13 | 青岛华泰电力设备有限公司 | Ball collector with automatic control system |
-
2018
- 2018-05-11 CN CN201810447637.3A patent/CN108827061B/en not_active Expired - Fee Related
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3316022C1 (en) * | 1983-03-17 | 1984-08-30 | Taprogge GmbH, 4000 Düsseldorf | Method and arrangement for monitoring the operability of a device for cleaning the pipes of a power plant condenser system or the like. |
| KR20050008214A (en) * | 2003-07-14 | 2005-01-21 | 두산중공업 주식회사 | System and Method of Measuring Cleaning Balls in the Condenser Tube Cleaning System of the Power Plant |
| CN101476838A (en) * | 2009-01-16 | 2009-07-08 | 沈阳工程学院 | Electric power plant condenser ball cleaning on-line monitoring device based on optical fiber sensing technology |
| CN102628659A (en) * | 2012-04-09 | 2012-08-08 | 清华大学 | Rubber ball washing monitoring device |
| US9835393B2 (en) * | 2012-09-20 | 2017-12-05 | Jeongwoo Industrial Machine Co., Ltd. | Apparatus for circulating balls for cleaning a pipe line |
| CN104266537A (en) * | 2014-10-14 | 2015-01-07 | 沈阳工程学院 | Power plant condenser rubber ball cleaning online monitoring device |
| CN204694149U (en) * | 2015-06-11 | 2015-10-07 | 沈阳工程学院 | A kind of high accuracy glueballs monitoring device |
| CN207095386U (en) * | 2017-06-07 | 2018-03-13 | 青岛华泰电力设备有限公司 | Ball collector with automatic control system |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114018087A (en) * | 2021-12-17 | 2022-02-08 | 蒋杰玉 | Centralized ball serving device capable of recycling rubber balls |
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| Publication number | Publication date |
|---|---|
| CN108827061B (en) | 2019-08-09 |
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Granted publication date: 20190809 |