CN107966587A - A kind of electronic ball for damage position detection on Production of fruit line - Google Patents

A kind of electronic ball for damage position detection on Production of fruit line Download PDF

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Publication number
CN107966587A
CN107966587A CN201711105040.2A CN201711105040A CN107966587A CN 107966587 A CN107966587 A CN 107966587A CN 201711105040 A CN201711105040 A CN 201711105040A CN 107966587 A CN107966587 A CN 107966587A
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China
Prior art keywords
module
pcb board
fruit
production
position detection
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Pending
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CN201711105040.2A
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Chinese (zh)
Inventor
蒋焕煜
倪雪萍
刘光远
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Zhejiang University ZJU
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Zhejiang University ZJU
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Priority to CN201711105040.2A priority Critical patent/CN107966587A/en
Publication of CN107966587A publication Critical patent/CN107966587A/en
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01PMEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
    • G01P15/00Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration
    • G01P15/18Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration in two or more dimensions

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Management, Administration, Business Operations System, And Electronic Commerce (AREA)

Abstract

The invention discloses a kind of electronic ball for damage position detection on Production of fruit line.Including:Sphere, circuit system and the real-time collection of signal based on LabVIEW and storage system;The sphere, is formed by connecting by upper hemisphere and lower hemisphere, and wireless communication is carried out with the collection in real time of the signal based on LabVIEW outside sphere and storage system equipped with the fixed plate for placing circuit system, circuit system in lower hemisphere.The present invention is used to detect the position that fruit may damage in the production line, by optimizing mechanical mechanism or increase safeguard measure on production line, to reduce the degree of impairment that fruit occurs in the production line;Mechanism of the present invention is simple, perfect in shape and function, performance are stablized, and the situation that damage occurs efficiently can be intuitively detected, so as to greatly reduce the economic loss in fruit industry.The detection of damage position may occur in the production line available for fruit such as apple, pears, citrus, tomatoes for the present invention.

Description

A kind of electronic ball for damage position detection on Production of fruit line
Technical field
The present invention relates to fruit bruising detection, more particularly, to a kind of electricity for damage position detection on Production of fruit line Bulbec.
Background technology
Needed after fruit harvesting by casing, transporting, being classified, a series of processes, fruit pole during these such as packing Impact easily occurs, so as to cause fruit to produce damage.On Production of fruit line, if can detect that these impacts, which occur, touches The position hit, and optimize the mechanical mechanism that impact position occurs or increase safeguard measure, so as to substantially reduce fruit The probability of damage.
Electronic ball is fabricated to the shape of similar fruit, and simulates fruit and transported in the production line with together with real fruit Dynamic, it can record the acceleration situation in motion process, so as to obtain fruit, there is a situation where damage.
The content of the invention
In order to solve the problems, such as present in background technology, it is an object of the invention to provide one kind to be used for Production of fruit line The electronic ball of damage position detection, to realize that the detection of damage position may occur in the production line for fruit.
In order to achieve the above object, the technical solution adopted by the present invention is:
The present invention includes:Sphere, circuit system and the real-time collection of signal based on LabVIEW and storage system;The sphere, by Upper hemisphere and lower hemisphere are formed by connecting, equipped with the fixed plate for placing circuit system, circuit system and sphere in lower hemisphere The collection in real time of the outer signal based on LabVIEW and storage system carry out wireless communication.
The circuit system, including:Control module, sensor assembly, wireless communication module and power module;Sensor die Block and wireless communication module pass through I with control module2C connections, power module is respectively to control module, sensor assembly and wireless Communication module is powered, and all modules are all connected on pcb board.
The signal based on LabVIEW gathers in real time and storage system, including:Visual interface and program interface, are based on Collection and storage system can realize that the acceleration information of sphere movement is wireless, be transmitted in real time and be in real time for the signal of LabVIEW On the visual interface of system, and the signal collected is stored in host computer in the form of a file;Wherein data storage function embodiment In the program interface of system.
The visual interface of the system, including:Basic parameter setup module, control operation module, data real-time display mould Block and curve real-time display module;Wherein:
Basic parameter setup module, for the setting of basic parameter to ensure the normal communication of software and equipment, including:Serial ports is set Put, Configuration of baud rate, data bit are set, parity bit is set, stop position is set and controlled stream and sets;
Control module is operated, for the beginning and end of control software operation, including:Start button and stop button;
Data real-time display module, can intuitively show each data of collection, including:Character string display, X-axis acceleration are shown Show, Y-axis acceleration is shown, Z axis acceleration is shown and total acceleration is shown;
The data collected can be changed into curve form by curve real-time display module, including:Each axle acceleration curve map and total Acceleration plots;Wherein data storage function embodiment is in the program interface of system.
The control module, uses Arduino ProMini, Arduino of the processor core for ATmega168 ProMini has 14 railway digital I/O ports at the same time, wherein 6 tunnels are exported as PWM, 6 tunnel simulation inputs, 8MHz's Crystal resonant, a reset button, control module operating voltage are 3.3V.
The sensor assembly, for measuring the impact acceleration in sphere motion process, three axis accelerometer therein Using the ADXL375 of AD companies, the duration hit or impacted can be continuously measured in ± 200 g full ranges And amplitude, and occur without saturation;Under the conditions of the up to full bandwidth of 1600 Hz, biosensor power consumption is 140 μ A, and power consumption is less than it The half of his sensor, and sampling rate is twice as.
The wireless communication module, using the ZigBee module of DIGI companies of U.S. XBee models, it is a kind of remote The digital transmission module of low-power consumption, frequency range have 2.4G, tri- kinds of 900M, 868M, while can compatibility 802.15.4 agreements.
The power module uses 3.7V, the lithium battery of 1000mAh, this lithium battery can be charged by charger.
The female group of four rows is welded on the pcb board, for the female group of control module row of link control module, for connecting The female group of sensor assembly row of sensor assembly, the wireless communication module for connecting wireless communication module arranges female group, for even Connect the female group of power module row of power module;The female group of four rows is connected with the row's pin welded in 4 modules respectively, therefore this 4 modules are detachable, and wherein detachability of the control module on pcb board causes controller to have the function of Reprogrammable; The 3rd mounting hole of the first mounting hole of pcb board, the second mounting hole of pcb board and pcb board is provided with pcb board, these three holes pass through respectively Tapping screw and respective the first fixed cylinder of cylinder pcb board, the second fixed cylinder of pcb board and the pcb board the 3rd in lower hemisphere Fixed cylinder is connected, so that pcb board is fixed in lower hemisphere.
The invention has the advantages that:
1) inspection of damage position may occur in the production line available for fruit such as apple, pears, citrus, tomatoes for the present invention Survey.
2) present invention is used to detect the position that fruit may damage in the production line, by optimizing the machine on production line Tool mechanism or increase safeguard measure, to reduce the degree of impairment that fruit occurs in the production line.
3) mechanism of the present invention is simple, perfect in shape and function, performance are stablized, and efficiently can intuitively detect the situation that damage occurs, So as to greatly reduce the economic loss in fruit industry.
Brief description of the drawings
Fig. 1 is course of work schematic diagram of the present invention.
Fig. 2 is the sphere structure schematic diagram of the present invention.
Fig. 3 is the circuit diagram of the present invention.
Fig. 4 is the pcb board structure chart of the present invention.
Fig. 5 is the signal of the invention based on LabVIEW collection in real time and the visual interface of storage system.
In figure:1st, sphere, 2, circuit system, 3, the signal based on LabVIEW collection and storage system in real time, 4, antenna, 5th, antenna, 6, Production of fruit line, 7, upper hemisphere, 7-1, screw thread, 7-2, episphere hollow parts, 8, lower hemisphere, 8-1, spiral shell Line, 8-2, fixed plate, 8-3, the first fixed cylinder of pcb board, 8-4, the second fixed cylinder of pcb board, 8-5, pcb board the 3rd fix circle Column, 8-6, lower semisphere hollow parts, 9, control module, 10, sensor assembly, 11, wireless communication module, 12, power module, 13rd, pcb board, 13-1, the female group of control module row, 13-2, the female group of wireless communication module row, 13-3, the female group of sensor assembly row, 13-4, the female group of power module row, 13-5, the first mounting hole of pcb board, 13-6, the second mounting hole of pcb board, 13-7, pcb board the 3rd Mounting hole, 14, basic parameter setup module, 14-1, serial port setting, 14-2, Configuration of baud rate, 14-3, data bit set, 14- 4th, parity bit set, 14-5, stop position set, 14-6, control stream set, 15, operation control module, 15-1, start button, 15-2, stop button, 16, data real-time display module, 16-1, character string display, 16-2, X-axis acceleration are shown, 16-3, Y-axis Acceleration is shown, 16-4, Z axis acceleration show that 16-5, total acceleration are shown, 17, figure real-time display module, 17-1, each axis Acceleration plots, 17-2, total acceleration curve map.
Embodiment
The invention will be further described with reference to the accompanying drawings and examples.
As shown in Figure 1 and Figure 2, the present invention includes:The collection in real time of sphere 1, circuit system 2 and signal based on LabVIEW and Storage system 3;The sphere 1, is formed by connecting by upper hemisphere 7 and lower hemisphere 8, passes through screw thread 7-1 between two hemispheres It is formed by connecting with 8-1, obtains a complete radio bulbec since then, wherein thread type is 55 ° of sealing taper pipe threads.Lower half Equipped with the fixed plate 8-2 for placing circuit system 2 in sphere 8, the hollow parts of upper hemisphere 7 and lower hemisphere 8 be filled with The suitable material of fruit weight;Circuit system 2 with the signal based on LabVIEW outside sphere 1 divide in real time by collection and storage system 3 Wireless communication is not carried out by antenna 4 and antenna 5.Electronic ball is put on fruit grading production line 6, makes it with real water Fruit is moved on production line 6, and electronic ball can measure the acceleration of X-axis, Y-axis and Z axis, and signal is wirelessly transmitted in real time Onto host computer, the collection in real time of the signal based on LabVIEW can display real-time with storing signal, from software circle with storage system 3 The larger position of impact acceleration can be intuitively found on face, by the optimization to these positions so as to reduce fruit in production line On damage.
As shown in figure 3, the circuit system 2, including:Control module 9, sensor assembly 10,11 and of wireless communication module Power module 12;Sensor assembly 10 and wireless communication module 11 pass through I with control module 92C connections, power module 12 are distinguished Power to control module 9, sensor assembly 10 and wireless communication module 11, all modules are all connected on pcb board 13.
As shown in figure 5, collection and storage system 3 include the signal based on LabVIEW in real time:Visual interface and program Interface, collection and storage system 3 can realize the acceleration information of sphere movement wirelessly, in real time to the signal based on LabVIEW in real time Ground is transmitted on the visual interface of system, and the signal collected is stored in host computer in the form of a file;Wherein data are stored up Function embodiment is deposited in the program interface of system.
As shown in figure 5, the visual interface of the system, including:Basic parameter setup module 14, control operation module 15, Data real-time display module 16 and curve real-time display module 17;Wherein:
Basic parameter setup module 14, for the setting of basic parameter to ensure the normal communication of software and equipment, including:Serial ports 14-1, Configuration of baud rate 14-2, data bit is set to set 14-3, parity bit to set 14-4, stop position that 14-5 and control stream are set 14-6 is set;
Control module 15 is operated, for the beginning and end of control software operation, it includes:Start button 15-1 and stop button 15-2;
Data real-time display module 16, can intuitively show each data of collection, it includes:Character string display 16-1, X-axis add Speed shows that 16-2, Y-axis acceleration show that 16-3, Z axis acceleration show that 16-4 and total acceleration show 16-5;
The data collected can be changed into curve form, so that data characteristics is more straight by curve real-time display module 17 See, it includes:Each axle acceleration curve map 17-1 and total acceleration curve map 17-2;Wherein data storage function embodiment is in system Program interface in.
The control module 9, uses Arduino ProMini, Arduino of the processor core for ATmega168 ProMini has 14 railway digital I/O ports at the same time, wherein 6 tunnels are exported as PWM, 6 tunnel simulation inputs, 8MHz's Crystal resonant, a reset button, control module operating voltage are 3.3V.
The sensor assembly 10, for measuring the impact acceleration in sphere motion process, 3-axis acceleration therein For meter using the ADXL375 of AD companies, it has similar highest bandwidth and lowest power consumption, ADXL375 three axis accelerometer energy Enough measurements continuous in ± 200 g full ranges are hit or the duration of impact and amplitude, and occur without saturation;Up to Under the conditions of the full bandwidth of 1600 Hz, biosensor power consumption is 140 μ A or so, and power consumption and samples speed less than the half of other sensors Rate is but twice as the above.ADXL375 is suitable for low-power consumption, battery powered wireless sensor system, and such system can For impacting and shaking detection, transport, asset tracking and the other application easily influenced suddenly be subject to huge power.
The wireless communication module 11, using the ZigBee module of DIGI companies of U.S. XBee models, it is a kind of long distance From the digital transmission module of low-power consumption, frequency range has 2.4G, tri- kinds of 900M, 868M, while can compatibility 802.15.4 agreements.
The power module 12 uses 3.7V, the lithium battery of 1000mAh, this lithium battery can be filled by charger Electricity, therefore can recycle.
The female group of four rows has been welded on the pcb board 13, the control module row for link control module 9 is female to organize 13-1, Sensor assembly for connecting sensor assembly 10 arranges female group 13-2, for connecting the radio communication mold of wireless communication module 11 The female group 13-3 of block row, the power module for connecting power module 12 arrange female group 13-4;The female group of four rows respectively with 4 moulds The row's pin welded on block is connected, therefore this 4 modules are detachable, and wherein detachability of the control module 9 on pcb board causes Controller has the function of Reprogrammable.The first mounting hole of pcb board 13-5, the second mounting hole of pcb board 13-6 are provided with pcb board 13 With the 3rd mounting hole 13-7 of pcb board, these three holes pass through the respective cylinder pcb board in tapping screw and lower hemisphere 8 the respectively One fixed cylinder 8-3, the 3rd fixed cylinder 8-5 of pcb board the second fixed cylinder 8-4PCB plates are connected, so that pcb board 13 be fixed In lower hemisphere 8.
The course of work of the present invention is as follows:
As shown in figure 4, it is COM3 to open the collection in real time of the signal based on LabVIEW and storage system 3, serial port setting 14-1, ripple It is 38400 that special rate, which sets 14-2, and it is 8 that data bit, which sets 14-3, and it is None that parity bit, which sets 14-4, and stop position sets 14-5 positions 1, It is None to control stream to set 13-6.
Electronic ball is put on a Production of fruit line 6, it is moved in the production line with real fruit.With This is filmed with video camera at the same time, by motion process.
In the signal based on LabVIEW, collection is opened with being clicked in storage system 3 in real time while electronic ball setting in motion Beginning button 15-1.Radio bulbec carries out wireless communication, data with the collection in real time of the signal on host computer with storage system at this time Character string display 16-1 on the visual interface of real-time display module 16 shows the character string being wirelessly transferred, X-axis acceleration Show that 16-2 shows the acceleration magnitude of X-axis, Y-axis acceleration shows that 16-3 shows the acceleration magnitude of Y-axis, and Z axis acceleration is shown 16-4 shows the acceleration magnitude of Z axis, and total acceleration shows that 16-5 shows total acceleration magnitude, and each axle acceleration curve map 17-1 is shown Show the acceleration plots of three axis, total acceleration curve map 17-2 shows total acceleration curve map.When electronic ball walks complete strips After production line, click on stop button 15-2, all acceleration informations will by the form of text automatic storage upper In the machine of position.
As shown in figure 5, from the total acceleration curve in total acceleration curve map 17-2 this it appears that produce compared with The point of big total acceleration, these are found out in figure and puts the corresponding time, according to these time points in the video being filmed Electronic ball location in the production line is found out, have found the position that may be damaged on production line since then.It is follow-up logical The mechanical structure for optimizing these positions or increase safeguard measure are crossed, damage of the fruit on Production of fruit line 6 can be substantially reduced, So as to greatly reduce the economic loss in fruit industry.
Above-mentioned embodiment is used for illustrating the present invention, rather than limits the invention, the present invention's In spirit and scope of the claims, to any modifications and changes of the invention made, protection model of the invention is both fallen within Enclose.

Claims (9)

  1. A kind of 1. electronic ball for damage position detection on Production of fruit line, it is characterised in that including:Sphere (1), circuit system Unite (2) and the signal based on LabVIEW gathers in real time and storage system (3);
    The sphere (1), is formed by connecting by upper hemisphere (7) and lower hemisphere (8), equipped with placement circuit in lower hemisphere (8) The fixed plate of system (2), circuit system (2) is gathered in real time with the signal based on LabVIEW of sphere (1) outside and storage system (3) wireless communication is carried out.
  2. A kind of 2. electronic ball for damage position detection on Production of fruit line according to claim 1, it is characterised in that:
    The circuit system (2), including:Control module (9), sensor assembly (10), wireless communication module (11) and power supply mould Block (12);Sensor assembly (10) and wireless communication module (11) pass through I with control module (9)2C connections, power module (12) Respectively pcb board is all connected to control module (9), sensor assembly (10) and wireless communication module (11) power supply, all modules (13) on.
  3. A kind of 3. electronic ball for damage position detection on Production of fruit line according to claim 1, it is characterised in that:
    The signal based on LabVIEW collection in real time and storage system (3), including:Visual interface and program interface, are based on Collection and storage system (3) can realize that the acceleration information of sphere movement is wireless, be transmitted in real time the signal of LabVIEW in real time On the visual interface of system, and the signal collected is stored in host computer in the form of a file;Wherein data storage functive In the program interface of present system.
  4. A kind of 4. electronic ball for damage position detection on Production of fruit line according to claim 1, it is characterised in that:
    The visual interface of the system, including:Basic parameter setup module (14), control operation module (15), data are shown in real time Show module (16) and curve real-time display module (17);Wherein:
    Basic parameter setup module (14), for the setting of basic parameter to ensure the normal communication of software and equipment, including:String Mouth sets (14-1), Configuration of baud rate (14-2), data bit to set (14-3), parity bit to set (14-4), stop position to set (14-5) and control stream set (14-6);
    Control module (15) is operated, for the beginning and end of control software operation, including:Start button (15-1) and stopping are pressed Button (15-2);
    Data real-time display module (16), can intuitively show each data of collection, including:Character string display (16-1), X-axis Acceleration shows that (16-2), Y-axis acceleration show that (16-3), Z axis acceleration show that (16-4) and total acceleration are shown (16-5);
    The data collected can be changed into curve form by curve real-time display module (17), including:Each axle acceleration curve map (17-1) and total acceleration curve map (17-2);Wherein data storage function embodiment is in the program interface of system.
  5. A kind of 5. electronic ball for damage position detection on Production of fruit line according to claim 2, it is characterised in that:
    The control module (9), uses Arduino ProMini, Arduino of the processor core for ATmega168 ProMini has 14 railway digital I/O ports at the same time, wherein 6 tunnels are exported as PWM, 6 tunnel simulation inputs, 8MHz's Crystal resonant, a reset button, control module (9) operating voltage are 3.3V.
  6. A kind of 6. electronic ball for damage position detection on Production of fruit line according to claim 2, it is characterised in that:
    The sensor assembly (10), for measuring the impact acceleration in sphere motion process, three axis accelerometer therein Using the ADXL375 of AD companies, the duration hit or impacted can be continuously measured in ± 200 g full ranges And amplitude, and occur without saturation;Under the conditions of the up to full bandwidth of 1600Hz, biosensor power consumption is 140 μ A, and power consumption is less than other The half of sensor, and sampling rate is twice as.
  7. A kind of 7. electronic ball for damage position detection on Production of fruit line according to claim 2, it is characterised in that:
    The wireless communication module (11), using the ZigBee module of DIGI companies of U.S. XBee models, it is a kind of remote The digital transmission module of low-power consumption, frequency range have 2.4G, tri- kinds of 900M, 868M, while can compatibility 802.15.4 agreements.
  8. A kind of 8. electronic ball for damage position detection on Production of fruit line according to claim 2, it is characterised in that: The power module (12) uses 3.7V, the lithium battery of 1000mAh, this lithium battery can be charged by charger.
  9. A kind of 9. electronic ball for damage position detection on Production of fruit line according to claim 2, it is characterised in that:
    The female group of four rows is welded on the pcb board (13), the female group (13- of control module row for link control module (9) 1) female group (13-2), is arranged for connecting the sensor assembly of sensor assembly (10), for connecting wireless communication module (11) The female group (13-3) of wireless communication module row, the power module for connecting power module (12) arrange female group (13-4);Described four The female group of row is connected with the row's pin welded in 4 modules respectively, this 4 modules are detachable, and wherein control module (9) is in pcb board On detachability cause controller that there is Reprogrammable;The first mounting hole of pcb board (13- is provided with pcb board (13) 5), the 3rd mounting hole (13-7) of the second mounting hole of pcb board (13-6) and pcb board, these three holes are respectively by tapping screw with Respective the first fixed cylinder of cylinder pcb board (8-3), the second fixed cylinder of pcb board (8-4) pcb board the 3rd in hemisphere (8) is solid Determine cylinder (8-5) to be connected, so that pcb board (13) is fixed in lower hemisphere (8).
CN201711105040.2A 2017-11-10 2017-11-10 A kind of electronic ball for damage position detection on Production of fruit line Pending CN107966587A (en)

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Application Number Priority Date Filing Date Title
CN201711105040.2A CN107966587A (en) 2017-11-10 2017-11-10 A kind of electronic ball for damage position detection on Production of fruit line

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Application Number Priority Date Filing Date Title
CN201711105040.2A CN107966587A (en) 2017-11-10 2017-11-10 A kind of electronic ball for damage position detection on Production of fruit line

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Publication Number Publication Date
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Publication number Priority date Publication date Assignee Title
CN1877337A (en) * 2006-06-23 2006-12-13 清华大学 Granular measuring device and in-situ measuring method thereof
CN101187613A (en) * 2007-12-27 2008-05-28 江苏大学 Agricultural material impact test device and method
JP4093659B2 (en) * 1998-12-10 2008-06-04 エスアイ精工株式会社 Article supply device
CN102749099A (en) * 2012-05-18 2012-10-24 浙江工业大学 Detection ball being capable of realizing medium motion measurement of ball mill
CN104215278A (en) * 2014-09-17 2014-12-17 暨南大学 Measuring device and measuring method for a variety of motion parameters of product under logistics environment
CN204373661U (en) * 2015-01-26 2015-06-03 江苏师范大学 Movement locus catcher
CN105222985A (en) * 2015-09-21 2016-01-06 中国科学院水利部成都山地灾害与环境研究所 A kind of rubble flow detection in vivo apparatus and method
CN105222762A (en) * 2015-09-21 2016-01-06 中国科学院水利部成都山地灾害与环境研究所 River course stream detection in vivo apparatus and method
CN106764247A (en) * 2016-11-23 2017-05-31 中国计量大学 Spherical detectors motion control method in pressure pipeline
CN109186587A (en) * 2018-09-14 2019-01-11 中国水利水电科学研究院 A kind of variable pebble bed-load motion study device counted certainly with track of specific gravity

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4093659B2 (en) * 1998-12-10 2008-06-04 エスアイ精工株式会社 Article supply device
CN1877337A (en) * 2006-06-23 2006-12-13 清华大学 Granular measuring device and in-situ measuring method thereof
CN101187613A (en) * 2007-12-27 2008-05-28 江苏大学 Agricultural material impact test device and method
CN102749099A (en) * 2012-05-18 2012-10-24 浙江工业大学 Detection ball being capable of realizing medium motion measurement of ball mill
CN104215278A (en) * 2014-09-17 2014-12-17 暨南大学 Measuring device and measuring method for a variety of motion parameters of product under logistics environment
CN204373661U (en) * 2015-01-26 2015-06-03 江苏师范大学 Movement locus catcher
CN105222985A (en) * 2015-09-21 2016-01-06 中国科学院水利部成都山地灾害与环境研究所 A kind of rubble flow detection in vivo apparatus and method
CN105222762A (en) * 2015-09-21 2016-01-06 中国科学院水利部成都山地灾害与环境研究所 River course stream detection in vivo apparatus and method
CN106764247A (en) * 2016-11-23 2017-05-31 中国计量大学 Spherical detectors motion control method in pressure pipeline
CN109186587A (en) * 2018-09-14 2019-01-11 中国水利水电科学研究院 A kind of variable pebble bed-load motion study device counted certainly with track of specific gravity

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Application publication date: 20180427