CN104280101A - Automatic static metering system and automatic control method for continuous material unloading at dock - Google Patents
Automatic static metering system and automatic control method for continuous material unloading at dock Download PDFInfo
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- CN104280101A CN104280101A CN201410561892.2A CN201410561892A CN104280101A CN 104280101 A CN104280101 A CN 104280101A CN 201410561892 A CN201410561892 A CN 201410561892A CN 104280101 A CN104280101 A CN 104280101A
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Abstract
The invention discloses an automatic static metering system and an automatic control method for continuous material unloading at a dock. The automatic static metering system comprises a material distributor of a material conveying device, a material weighing device, a metering operation station, a local metering server, a PLC and a basic automatic operation station. The material weighing device is composed of a first weighing hopper, a second weighing hopper, a first weighing sensor set, a second weighing sensor set, a first weighing instrument and a second weighing instrument. The PLC controls the material distributor and a hydraulic drive device of the material weighing device. The PLC, the first weighing instrument and the second weighing instrument are connected with the metering operation station. The metering operation station is used for reading signals of the PLC and data displayed by the first weighing instrument and the second weighing instrument in real time and storing the data in the local metering server. The basic automatic operation station controls the PLC. Information of bulk materials on ships from the moment when the materials enter the dock to the moment when the materials are weighed and unloaded is mastered comprehensively, and the material metering accuracy is improved.
Description
Technical field
The present invention relates to metallurgy, mine, harbour goods and materials continuous automatic metering, be specifically related to a kind of wharf materials progressive unloading AUTOMATIC STATIC metering system and autocontrol method.
Background technology
For a long time, the enterprises such as Large Steel ironworks, fuel-burning power plant, all measured by the mode of boats and ships dipping by bulk material such as iron ore, coal, pellet, the lime stone etc. of Shipping, after heavy duty examined by boats and ships, marine store is transported to land, rear storage area by sealing-tape machine, and operation process is progressive unloading process.
Dock ship bulk material unloading sixty-four dollar question is the continuity of unloading, when not affecting unloading operation rate, can carry out effective quantitative statistics again to bulk material.Along with the progress of science and technology, being gradually improved of measurement technology, belted electronic balance has been used in dock ship bulk raw material unloading metering, the belted electronic balance Measure Guarantee continuity of ship unloading operation, any negative effect can not be brought to production operation, while guarantee production operational availability, provide more accurate continuous data.But in practice, in the continuous Dynamic Weighting process of belted electronic balance, several factors all can affect the measuring accuracy of belted electronic balance, as the change etc. of the kind of the change of belt tension, belt deviation and material, therefore, for the belted electronic balance be arranged on transport various materials sealing-tape machine, the accuracy of often kind of material metering data can not be ensured.
After the metering of dock ship bulk material also adopts vessel unloading, again by carborne to truck scale static weighing, this kind of metering method can ensure the accuracy of continuous data, but cost of wheeling is higher and adopt this kind of mode to need the manpower and materials of at substantial for steel plant, all bulk raw materials in fuel-burning power plant, and due to harbour unloading boats and ships more, material variety is many, and quantity is large, expend large, therefore all adopt truck scale static weighing unrealistic.
Summary of the invention
An object of the present invention is to overcome the deficiencies in the prior art, and provide a kind of wharf materials progressive unloading AUTOMATIC STATIC metering system, this metering system can realize the static weighing of material, improve the degree of accuracy of material weighing, and measuring cost is low.
Two of object of the present invention is that the method is simple to operate, measure data precision in order to provide a kind of wharf materials progressive unloading AUTOMATIC STATIC to measure autocontrol method.
An object of the present invention can be achieved through the following technical solutions:
A kind of wharf materials progressive unloading AUTOMATIC STATIC metering system, it is characterized in that: the distributing device comprising device for transporting objects, material metage device, metrological operation station, local metering server, PLC and basic automatization active station, described material metage device comprises first and to weigh hopper, second weighs hopper, first LOAD CELLS group, second LOAD CELLS group, first weighing instrument and the second weighing instrument, described first hopper and second hopper of weighing of weighing is arranged side by side below distributing device, first hopper and second hopper upper end of weighing of weighing is provided with distributing device position proximity sensor for detecting distributing device position, described first LOAD CELLS is mounted on first and weighs hopper lower end, for to first weigh hopper weigh, first LOAD CELLS group is electrically connected with the first weighing instrument, described second LOAD CELLS is mounted on second and weighs hopper lower end, for to second weigh hopper weigh, second LOAD CELLS group is electrically connected with the second weighing instrument, described first, second weigh hopper bucket at the bottom of be respectively equipped with parallel-moving type gate, each parallel-moving type gate is connecting fluid hydraulic driver respectively, hopper of respectively weighing is provided with the position transducer for detecting parallel-moving type shutter opening and closing,
Described PLC comprises PLC controlling center and PLC controls slave station, described PLC controlling center controls slave station by DP network with PLC and is connected, PLC controlling center respectively with the distributing device of device for transporting objects, for detecting the distributing device position proximity sensor of distributing device position, for detecting the position transducer of parallel-moving type shutter opening and closing, the operation valve electrical connection of fluid pressure drive device, for receiving distributing device position signalling and parallel-moving type shutter opening and closing signal, and control distributing device and fluid pressure drive device, described PLC controls slave station, first weighing instrument is connected with metrological operation station by serial server with the second weighing instrument, metrological operation station is used for reading the signal and first that PLC controls slave station in real time, the data of the second weighing instrument display, and for by data storing to local metering server, described basic automatization active station is connected with PLC controlling center by Ethernet, for control PLC main website and PLC slave station.
First, second LOAD CELLS group described is equipped with multiple LOAD CELLS, and described multiple LOAD CELLS is the lower end that matrix form is distributed in first, second hopper of weighing.
Described first weigh hopper and the second upper end of weighing hopper is rectangular parallelepiped, and bottom is multiple trapezoidal discharge ports, and each trapezoidal discharge port is equipped with a parallel-moving type gate, and described parallel-moving type gate adopts opposite opened hydraulic gate.
Described distributing device position proximity sensor is located at the first " A start station ", " B returns station ", " C limit station " and second of weighing hopper respectively and is weighed " A starts station ", " B returns station ", " C limit station " of hopper.
Also comprise measuring control center, described measuring control center is connected with metrological operation station.
Also comprise video monitoring apparatus, described video monitoring apparatus is connected with measuring control center, and video monitoring apparatus is used for carrying out video monitoring to whole vessel unloading metering process.
Two of object of the present invention can be achieved through the following technical solutions:
A kind of wharf materials progressive unloading AUTOMATIC STATIC measurement control method, it is characterized in that: the permission that described metrological operation station presets first, second hopper of weighing weighs condition, described metrological operation station weighs the first hopper and second of weighing and to weigh the tare weight first of hopper, described basic automatization active station sends the distributing device starting device for transporting objects to PLC controlling center, for detecting the distributing device position proximity sensor of distributing device position, for the signal of the drive unit of the position transducer and parallel-moving type gate that detect parallel-moving type shutter opening and closing, the distributing device position that distributing device position proximity sensor is detected by DP bus by PLC controlling center, the parallel-moving type shutter opening and closing status signal that position transducer detects is sent to PLC and controls slave station, the instruction in PLC control slave station is read by serial server in metrological operation station, the real-time weight data of the first weighing instrument and the second weighing instrument judges it is meet to allow weighing condition, weighing condition is allowed if meet, PLC controlling center controls distributing device and to weigh loading hopper to first, first loading hopper of weighing terminates, PLC controlling center controls distributing device and shifts to second and to weigh hopper, to weigh loading hopper to second, meet the first gross weight of weighing hopper and weigh condition, the gross weight that hopper is weighed in metering first, and this gross weight is delivered to local metering server, after gross weight has measured, metrological operation station controls slave station through PLC and opens to the transmission of PLC controlling center the instruction that the first parallel-moving type gate of weighing hopper carries out blowing, after blowing terminates, metrological operation station controls slave station through PLC and sends closedown first to PLC controlling center and to weigh the instruction of parallel-moving type gate of hopper, meet the first tare weight of weighing hopper and weigh condition, the tare weight that hopper is weighed in metering first, this tare weight is delivered to local metering server, weigh on hopper if distributing device is positioned at first, according to first weigh hopper weigh gross weight, tare weight control method weigh gross weight, the tare weight of the second weighing bucket, by first weigh hopper and second weigh hopper replace weighing realize wharf materials progressive unloading AUTOMATIC STATIC metering.
Described distributing device runs from " A station " to " B returns station " that first weighs hopper and carries out cloth, when arrival first weigh hopper " B returns station " after distributing trolley oppositely to second weigh hopper " A starts station " run, arrival second is weighed after hopper, and distributing device runs from " A station " to " B returns station " that second weighs hopper and carries out cloth.
The alarming value of hopper of weighing is preset at described metrological operation station, if when metrological operation station detects that Hopper Weight of weighing is greater than alarming value, metrological operation station controls slave station to PLC controlling center generation alarm through PLC, controls distributing device sail out of this hopper of weighing immediately by PLC controlling center.
Described metrological operation station is provided with MANUAL CONTROL mode, manually controls to weigh, and typing weighing data.
Beneficial effect of the present invention: the present invention adopts the distributing device of device for transporting objects, material metage device, metrological operation station, local metering server, PLC and basic automatization active station are formed, described material metage device comprises first and to weigh hopper, second weighs hopper, distributing device gives first back and forth repeatedly, second hopper of weighing carries out cloth, first, second hopper upper end of weighing is provided with distributing device position proximity sensor for detecting distributing device position, described first, second weigh hopper bucket at the bottom of be respectively equipped with parallel-moving type gate, each parallel-moving type gate is driven by the drive unit of parallel-moving type gate, hopper of respectively weighing is provided with the position transducer for detecting parallel-moving type shutter opening and closing, described PLC comprises PLC controlling center and PLC controls slave station, PLC controlling center is for receiving distributing device position signalling and parallel-moving type shutter opening and closing signal, and control distributing device and fluid pressure drive device, basic automatization active station control PLC controlling center and PLC control slave station, metrological operation station is used for reading PLC in real time and controls the signal of slave station and the data of first, second weighing instrument display, and for by data storing to local metering server, improve marine store unloading weigh weighing precision.The present invention realizes carrying out height integrating control to material metage device, and undertaken debugging and functional test by present system, achieve to boats and ships bulk raw material from entering the comprehensive control of harbour to material weighing system Download Info, this system reaches country's III grade of scale class of accuracy.
Comprise measuring control center, described measuring control center is connected with metrological operation station, is monitored by measuring control center, realizes sharing of data.
Present system also comprises video monitoring apparatus, and the present invention uses network technology and Video Supervision Technique, is used for monitoring whole vessel unloading metering process, provides foundation to measure control, and also have the function of anti-cheating by video monitoring apparatus.
Control method of the present invention is simple, distributing device is controlled first according to distributing device position signalling by PLC, second weighs the cloth on hopper, PLC by gather parallel-moving type shutter opening and closing signal transmission to metrological operation station, tare weight is carried out as metrological operation station, gross weight weighs Rule of judgment, and accessory drive open or close parallel-moving type gate carry out blowing or charging prepare, the distributing device position that metrological operation station is transmitted in real time according to PLC, the numeral change of parallel-moving type shutter opening and closing state and weighing instrument display determines first, whether the second hopper of weighing meets weighing condition, if meet the first gross weight of weighing hopper, tare weight weighs condition, carry out gross weight, tare weight weighs, if meet the second the weigh tare weight of hopper, gross weight to weigh condition, carry out tare weight, gross weight weighs, control method of the present invention carries out Omnibearing automatic control to the ruuning situation of on-the-spot material, achieve the weighing and metering to the large raw material of harbour when guaranteeing material transportation operating rate, what ensure that bulk materials continuous data has accuracy and validity.
The pre-alarm value of hopper of weighing is preset at described metrological operation station; if when metrological operation station detects that Hopper Weight of weighing is greater than early warning value; metrological operation station through PLC slave station to PLC controlling center generation alarm; control distributing device by PLC controlling center and sail out of this hopper of weighing immediately; thus protect material metage device; avoid material metage device damaged, also ensure the accuracy of metric results simultaneously.
Described metrological operation station is provided with MANUAL CONTROL mode, manually control distributing device, parallel-moving type gate, typing weighing conditional information, avoid because metrological operation station after there is PLC or network problem quits work, thus ensure that the normal operation that dock ship unloads.The present invention not only considers automatic Weighing under normal circumstances, and considers manually weighing when outside unit exception, manual uploading data function, guarantees that harbour continuous data is reliable, stable.
Accompanying drawing explanation
Fig. 1 is circuit theory diagrams of the present invention;
Fig. 2 is present invention process process flow diagram;
Fig. 3 is the front elevation of material metage device of the present invention;
Fig. 4 is the side view of material metage device of the present invention;
The top of Fig. 5 a control method process flow diagram of the present invention;
The bottom of Fig. 5 b control method process flow diagram of the present invention;
The measurement flow figure of Fig. 6 the present invention first, second weigh hopper tare weight and gross weight.
Specific embodiment
Below in conjunction with accompanying drawing, the present invention is further illustrated.
See shown in Fig. 1 to Fig. 6, a kind of wharf materials progressive unloading AUTOMATIC STATIC metering system, comprise metrological operation station 1, local metering server 2, basic automatization active station 3, switch 4, material metage device 5, MOXA Multi-serial port server 9, device for transporting objects 10, the distributing device 11 of device for transporting objects 10, communication cable and PLC, device for transporting objects 10 adopts belt conveyor, device for transporting objects is controlled by PLC, belt conveyor is divided into two sections, one end of first paragraph belt conveyor 10-1 is positioned at dock ship 15, the other end is connected with distributing device 11 and carries out cloth, second segment belt conveyor 10-2 extends to rear plant area stockyard 16, described distributing device 11 adopts and comprises charge car, cantilever sealing-tape machine and the middle supporting track arranged of cantilever sealing-tape machine are formed, this supporting track ensure that the even running of cantilever sealing-tape machine.
Described material metage device 5 comprises bracing frame, first weighs hopper 5-1, second weighs hopper 5-2, first LOAD CELLS group 5-3, second LOAD CELLS group 5-4, first weighing instrument 5-5 and the second weighing instrument 5-6, the first hopper 5-1 and second that weighs weighs outside hopper 5-2 and is provided with bracing frame, described first hopper 5-1 and the second hopper 5-2 that weighs that weighs is arranged side by side below distributing device 11, described first weigh hopper 5-1 and the second upper end of weighing hopper 5-2 is rectangular parallelepiped, first, second weighs hopper 5-1, the upper end charging aperture bore of 5-2 is larger, bottom is multiple trapezoidal discharge ports, the present embodiment adopts four trapezoidal discharge ports, first weigh hopper 5-1 and the second below of weighing hopper 5-2 is equipped with surge bunker 5-7, the upper end of each surge bunker 5-7 is provided with radar level gauge 18, radar level gauge 18 is connected with PLC, material is discharged in surge bunker 5-7, arrive on second segment belt conveyor 10-2 by surge bunker 5-7, then the rear plant area stockyard 16 of specifying is arrived by second segment belt conveyor 10-2, in order to reduce the probability of first, second hopper 5-1,5-2 sizing in charging process of weighing, first, second hopper 5-1,5-2 wall inclination angle of weighing is larger.
Described first hopper 5-1 and second hopper 5-2 upper end of weighing of weighing is provided with distributing device position proximity sensor 17 for detecting distributing device 11 position, described distributing device position proximity sensor 17 points is laid in the first hopper 5-1 and second that weighs and weighs " A starts station " of hopper 5-2, " B returns station " and " C limit station ", described " A starts station " represents that distributing device 11 carries out cloth from A starting position, described " B returns station " represents that distributing device 11 returns after arriving this position, described " C limit station " represents that distributing device 11 is first, second weighs hopper 5-1, position of crossing the border on 5-2, for security consideration, distributing device 11 will stop immediately.What described distributing device position proximity sensor was distributing device 11 returns, along stopping, suddenly stopping providing position signalling.
Described first, second LOAD CELLS group 5-3, 5-4 is equipped with multiple LOAD CELLS, multiple LOAD CELLS is that matrix form is distributed in first, second weighs hopper 5-1, the lower end frame of the bracing frame of 5-2, described first LOAD CELLS group 5-3 is located at first and weighs hopper 5-1 lower end, for weighing the first hopper 5-1 that weighs, first LOAD CELLS group 5-3 is electrically connected with the first weighing instrument 5-5, described second LOAD CELLS group 5-4 is located at second and weighs hopper 5-3 lower end, for weighing the second hopper 5-2 that weighs, second LOAD CELLS group 5-4 is electrically connected with the second weighing instrument 5-6.The present embodiment is with each net weight of first, second weigh hopper 5-1,5-2 78 tons, supported by six LOAD CELLS, the upper weight limit that each LOAD CELLS supports is 100 tons, and it be 400kg-200t is example that first, second weigh hopper 5-1,5-2 fill material net weight scope.First LOAD CELLS group 5-3 adopts six LOAD CELLS, and these six LOAD CELLS are connected with the first terminal box by connection, and the first terminal box is connected with the first weighing instrument 5-5 by communication bus; Second LOAD CELLS group 5-4 adopts six LOAD CELLS, and these six LOAD CELLS are connected with the second terminal box by connection, and the second terminal box is connected with the second weighing instrument 5-6 by communication bus.
Described first the weigh trapezoidal discharge port of hopper 5-2 of hopper 5-1 and second of weighing is equipped with a pair parallel-moving type gate 5-8, described parallel-moving type gate 5-8 adopts opposite opened hydraulic gate, each parallel-moving type gate 5-8 is connecting fluid hydraulic driver 5-9 respectively, rail is provided with below parallel-moving type gate 5-8, opposite opened hydraulic gate has roller, parallel-moving type gate 5-18 is by roller scrolling realization opening or closing parallel-moving type gate 5-8 on rail, first, second weighs hopper 5-1, in 5-2, the weight of material mainly supports by parallel-moving type gate, fluid pressure drive device 5-9 is connected with ground oil conduit by consistent lubricant pipe, ground oil conduit is connected with Hydraulic Station, parallel-moving type gate 5-8 is opened or closed by fluid pressure drive device, two hoppers of weighing are equipped with the position transducer for detecting parallel-moving type shutter opening and closing, in charging process, the weight of material is born primarily of opposite opened hydraulic gate, to parallel-moving type gate 5-8 effectively control charging and weighing process in most important, in order to ensure in weighing process without the impact of external force on material weighing device 5, fluid pressure drive device 5-9 is connected by consistent lubricant pipe with ground oil conduit, eliminates the interference of external force.By practical application, parallel-moving type gate 5-8 is in unlatching and closing process, and the eliminating of and External force interference comparatively large due to himself weight, makes weighing instrument weight unchanged, meet and weigh requirement.
Described PLC comprises PLC controlling center 7 and PLC controls slave station 6, described PLC controlling center 7 controls slave station 6 by DP network with PLC and is connected, the described PLC controlling center 7 of the present embodiment and PLC control to be provided with ET200M slave station 8 between slave station 6, interface is expanded further by ET200M slave station 8, PLC controlling center 7 is connected with ET200M slave station 8 by DP network, ET200M slave station 8 controls slave station 6 by DP network with PLC and is connected, described PLC controlling center 7 is S7-300PLC, it is S7-200PLC that described PLC controls slave station 6, this S7-200PLC is S7-200PLC CPU226, S7-300PLC realizes the signal exchange with S7-200PLC by Profibus-DP, PLC controlling center 7 is respectively by the distributing device 11 of communication cable and device for transporting objects, for detecting the distributing device position proximity sensor of distributing device position, for detecting the position transducer of parallel-moving type shutter opening and closing, the operation valve electrical connection of fluid pressure drive device 5-9, for receiving distributing device position signalling and parallel-moving type shutter opening and closing signal, and control distributing device 11 and fluid pressure drive device 5-9.Described PLC is controlled slave station 6 and is connected with MOXA Multi-serial port server 8 by RS485 bus, for communication signal is sent to metrological operation station 1, described first weighing instrument 5-5 is connected with MOXA Multi-serial port server 9 respectively by RS232 bus with the second weighing instrument 5-6, for weighing data is sent to metrological operation station 1, MOXA Multi-serial port server 9 is connected with the switch 4 at metrological operation station 1 by netting twine, this switch is connected with local metering server with metrological operation station by netting twine, metrological operation station 1 is configured with two host computers, host computer is provided with weighing system software, a host computer uses, wherein a host computer is as subsequent use, two host computers are connected with the switch at metrological operation station respectively by netting twine, PLC controls the signal exchange that slave station 6 passes through Modbus-RTU protocol realization and metrological operation station 1, respectively S7-200PLC communication port is mapped to the 3rd PORT COM by port mapping software in the host computer at metrological operation station 1, first weighing instrument is mapped to the 4th PORT COM, second weighing instrument is mapped to the 5th PORT COM, the 3rd is accessed respectively by programming, 4th, five-port realizes controlling slave station 6 to PLC, the access of the first weighing instrument 5-5 and the second weighing instrument 5-6, the signal and first that PLC controls slave station 6 is read at metrological operation station 1 in real time, second weighing instrument 5-5, the data of 5-6 display, automatic Weighing is carried out according to the field equipment state information that PLC sends, data are saved in local metering server 2, and for by data storing to local metering server 2, and real-time weight data is passed to PLC control slave station 6, PLC controls slave station 6 by DP network delivery to PLC controlling center 7, as distributing device 11, the operation Rule of judgment of fluid pressure drive device 5-9, described basic automatization active station 3 is configured with two host computers, wherein one is for subsequent use, two host computers are connected with the switch 4 of basic automatization active station 3 by netting twine, and this switch is connected with PLC controlling center 7 by Ethernet, for control PLC main website 7 and PLC slave station 6.This material metage system is gathered control signal by RS485 bus (Modbus), by RS232 bus, instrument weighing data is gathered, achieve material metage system by reading, showing the weighing data of metering entrusted information and the correspondence confirmed during network implementation, fully automatic culculating is carried out to harbour discharging.
Described metrological operation station 1 is provided with MANUAL CONTROL mode, and for Non-follow control, logging data information, manually pattern ensure that material metage system also can normally be run after there is network failure.This material metage system not only considers automatic Weighing under normal circumstances, and consider manually weighing when outside unit exception, manual uploading data function, guarantee that harbour continuous data is reliable, stable, avoid because network failure metrological operation station quits work.
Further, optical fiber is passed through at the metrological operation station 1 of metering system of the present invention, switch 4 and vessel unloading active station 12, measuring control center 13 is connected with the measuring control server 14 at measuring control center 13, vessel unloading active station 12 sends to metrological operation station and has confirmed to start unloading information, measuring control center sends metering entrusted information to 13 metrological operation stations, the marine store of metrological operation station 1 to the metering entrusted information received weighs, and the tare weight that will at every turn obtain, gross weight and net weight data are sent to the measuring control server 14 at measuring control center 13, the middle data being stored in measuring control server 14 received are read at measuring control center 13.
Further, also comprise video monitoring apparatus, described video monitoring apparatus is connected with the measuring control server 14 at measuring control center 13, video monitoring apparatus is used for carrying out video monitoring to whole vessel unloading metering process, for whole metering process provides video foundation, when producing metering objection, for checking.
Further, metering system of the present invention also comprises public auxiliary device, and public auxiliary device comprises the servicing unit such as hydraulic cooling system, vibrator, and described servicing unit is connected with PLC controlling center.
The present invention not only ensure that the continuity of boats and ships bulk material unloading operation, and achieves bulk material weighing and metering by static weighing state, ensure that the bulk material metering accuracy of Shipping.Measuring apparatus and control technology, weighing technology are combined closely, and solve the static weighing problem under boats and ships bulk material progressive unloading.
The wharf materials progressive unloading AUTOMATIC STATIC measurement control method that metering system of the present invention adopts is as follows,
Concrete steps are as follows:
Described metrological operation station presets first, second weighs hopper 5-1, the permission of 5-2 weighs condition and first, second alarming value of weighing hopper, described alarming value comprises pre-alarm value and high alarming value, if metrological operation station detects that first weighs hopper 5-1 weight when being greater than pre-alarm value, metrological operation station 1 controls slave station 6 through PLC, to PLC controlling center 7, alarm occurs, control distributing device 11 by PLC controlling center 7 and sail out of this hopper of weighing immediately, moving to second weighs on hopper 5-2, in operational process, if the second hopper 5-2 that weighs does not meet charging condition, distributing device 11 need stop immediately, be equally applicable to second to weigh hopper 5-2, described high alarming value is the value in order to protect measuring apparatus to set, and distributing device and the stop motion of correlative conveying device when reaching high alarming value, until Failure elimination.
Metrological operation station weighs the first hopper 5-1 and second that weighs and to weigh the tare weight first of hopper 5-2;
Described basic automatization active station 3 sends to PLC controlling center 7 and starts the distributing device 11 of device for transporting objects 10 and the signal of fluid pressure drive device, and the parallel-moving type gate 5-8 open and-shut mode signal that distributing device 11 position that distributing device position proximity sensor is detected by DP bus by PLC controlling center 7, position transducer are detected is sent to PLC and controls slave station 6, the signal in PLC control slave station 6 is read by MOXA Multi-serial port server 9 in metrological operation station 1, the real-time weight data of the first weighing instrument 5-5 and the second weighing instrument 5-6 judges whether to meet and allows charging condition, charging condition is allowed if meet, PLC controlling center 7 controls distributing device 11 and feeds to the first hopper 5-1 that weighs, distributing device 11 runs from " A station " to " B returns station " that first weighs hopper 5-1 and carries out cloth, first weigh hopper 5-1 feed terminate, PLC controlling center 7 controls distributing device 11 and shifts to second and to weigh hopper 5-2, feed to the second hopper 5-2 that weighs, when arriving, weigh " A starts station " of hopper 5-2 of " B returns station " backward second is mobile, arrival second is weighed after hopper 5-2, distributing device 11 runs from " A station " to " B returns station " that second weighs hopper 5-2 and carries out cloth.
When distributing device 11 is weighed on hopper 5-2 second, and meet weighing first and to weigh the gross weight terms of hopper 5-1, the gross weight that hopper 5-1 is weighed in metering first, and this gross weight is delivered to local metering server 2, after gross weight has measured, metrological operation station 1 controls slave station 6 through PLC and opens to PLC controlling center 7 transmission the instruction that the first parallel-moving type gate 5-8 weighing hopper 5-1 carries out blowing, parallel-moving type gate 5-8 opens and puts in place two minutes is that material has unloaded, or the first weight of weighing hopper is less than the low level threshold values of setting, metrological operation station 1 controls slave station 6 through PLC and sends closedown first to PLC controlling center 7 and to weigh the instruction of parallel-moving type gate 5-8 of hopper 5-1, after the first parallel-moving type gate 5-8 pass of weighing hopper puts in place, meet weighing first to weigh the tare weight condition of hopper 5-1, the tare weight that hopper 5-1 is weighed in metering first, this tare weight is delivered to local metering server 2, metrological operation station 2 controls slave station 6 through PLC and sends the first hopper 5-1 tare weight of weighing to PLC controlling center 7 and weighed instruction.
Weigh on hopper 5-1 when distributing device 11 is positioned at first, and meet weighing second and to weigh the gross weight terms of hopper 5-2, the gross weight that hopper 5-2 is weighed in metering second, and this gross weight is delivered to local metering server 11, after gross weight has measured, metrological operation station controls slave station 6 through PLC and opens to PLC controlling center 7 transmission the instruction that the second parallel-moving type gate 5-8 weighing hopper 5-2 carries out blowing, parallel-moving type gate 5-8 opens after the 2 minutes blowings that put in place terminate, or the second weight of weighing hopper is less than the low level threshold values of setting, metrological operation station 1 controls slave station 6 through PLC and sends closedown second to PLC controlling center 7 and to weigh the instruction of parallel-moving type gate 5-8 of hopper 5-2, after the second parallel-moving type gate 5-8 pass of weighing hopper puts in place, meet weighing second to weigh the tare weight condition of hopper 5-2, the tare weight that hopper 5-2 is weighed in metering second, this tare weight is delivered to local metering server 2, metrological operation station 1 controls slave station 6 through PLC and sends the second hopper 5-2 tare weight of weighing to PLC controlling center 7 and weighed instruction, by first weigh hopper 5-1 and second weigh hopper 5-2 replace weighing realize wharf materials progressive unloading AUTOMATIC STATIC metering.
Each weighing result (net weight after gross weight, tare weight, calculating) is kept in local metering server 2 by metrological operation station 1, be sent in the measuring control server 14 at measuring control center 13 simultaneously, form statistical report form and metering voucher by measuring control center 13.Boats and ships metering entrusted information to be unloaded is transmitted to metrological operation station 1 by measuring control center 13 in real time, and the weighing system at metrological operation station can not automatically perform, and the weighing system at rear metrological operation station 1 just performs to need vessel unloading active station 12 to confirm.
Described metrological operation station 1 manually control model controls direction of motion and speed, the opening and closing of parallel-moving type gate and the typing of weighing data of distributing device.By arrange manually weigh, manual uploading data function, guarantee harbour continuous data reliability and stability.
Described first, second weighs hopper 5-1, the weighing system that the permission of 5-2 weighs condition and metrological operation station is preset the first hopper 5-1 and second that weighs and is weighed the weight change value of hopper 5-2 within a period as the judgement symbol t whether allowing to measure, the described weight change value of hopper within a period of weighing is that weighing instrument numeral has the changing value of 10 ~ 400 kilograms in 2 ~ 20 seconds, the present embodiment adopts weighing instrument numeral in 2 seconds to have the value that becomes of 400 kilograms to be example, when if weighed, the change of the weight change value of hopper within a period is less than setting changing value, hopper of weighing remains static, allow metering, when the change of hopper weight change value within a period of weighing is greater than setting changing value, hopper of weighing is in dynamic change that is reinforced or blowing, does not measure,
Operator logs in the weighing system at metrological operation station 1, the data of first, second weighing instrument 5-5,5-6 of distributing device 11 positional information that described metrological operation station 1 sends according to PLC controlling center 7 and reading judge whether first, second weigh hopper 5-1,5-2 meet weighing condition, and transmit control signal to PLC controlling center.
Concrete determination methods is as follows,
(1) if charge car 11 is weighed on hopper 5-1 first:
Weighing system to read in local metering server 2 first hopper of weighing and allows Calibrated markings t: if the first hopper of weighing allows Calibrated markings t=0, hopper of weighing first allows Calibrated markings t to be set to m, and m represents that the first hopper metering gross weight of weighing prepares; If the first hopper of weighing allows Calibrated markings t=m, then the first hopper of weighing allows Calibrated markings t to remain unchanged;
Judge whether the second hopper 5-2 that weighs meets metered condition:
1) if the second hopper of weighing allows Calibrated markings t=m, the second parallel-moving type gate 5-8 weighing hopper 5-2 closes and puts in place, and the second hopper 5-2 that weighs remains static, allow metering, the gross weight that hopper 5-2 is weighed in weighing system metering second, the second hopper 5-2 that weighs measures complete, and open the second parallel-moving type gate of weighing hopper 5-2, hopper of simultaneously weighing second allows Calibrated markings t to be set to 0;
2) if the second hopper of weighing allows Calibrated markings t=P, the second parallel-moving type gate 5-8 weighing hopper 5-2 closes and puts in place, and the second hopper 5-2 that weighs remains static, allow metering, the tare weight that hopper 5-2 is weighed in weighing system metering second, the second hopper 5-2 that weighs measures complete, and hopper of weighing second allows Calibrated markings t to be set to 0;
3) if the second hopper of weighing allows Calibrated markings t=0:
If 1. the second parallel-moving type gate 5-8 weighing hopper 5-2 closes and puts in place, represent second and weigh hopper 5-2 in original state;
If 2. the second parallel-moving type gate 5-8 weighing hopper 5-2 reaches position, hopper of weighing second allows Calibrated markings t to be set to P, represent second and weigh hopper 5-2 just in discharging, second weighs after hopper 5-2 blowing terminates, and closes the second parallel-moving type gate of weighing hopper 5-2, and the second hopper 5-2 that weighs remains static, allow metering, the tare weight that hopper 5-2 is weighed in weighing system metering second, second weighs, and 5-2 is complete in hopper metering, and hopper of weighing second allows Calibrated markings t to be set to 0;
(2) if charge car is weighed on hopper 5-2 second:
Weighing system to read in local metering server 2 the second permission Calibrated markings t weighing hopper: if the second hopper of weighing allows Calibrated markings t=0, hopper of weighing second allows Calibrated markings t to be set to m; If the second hopper of weighing allows Calibrated markings t=m, then the second hopper of weighing allows Calibrated markings t to remain unchanged.
Judge whether the first hopper 5-1 that weighs meets metered condition:
1) if the first hopper of weighing allows Calibrated markings t=m, the first parallel-moving type gate 5-8 weighing hopper 5-1 closes and puts in place, and the first hopper 5-1 that weighs remains static, allow metering, the gross weight that hopper 5-1 is weighed in weighing system metering first, the first hopper 5-1 that weighs measures complete, and open the first parallel-moving type gate of weighing hopper 5-1, hopper of simultaneously weighing first allows Calibrated markings t to be set to 0;
2) if the first hopper of weighing allows Calibrated markings t=P, the first parallel-moving type gate 5-8 weighing hopper 5-1 closes and puts in place, and the first hopper 5-1 that weighs remains static, allow metering, the tare weight that hopper 5-1 is weighed in weighing system metering first, the first hopper 5-1 that weighs measures complete, and hopper of weighing first allows Calibrated markings t to be set to 0;
3) if the first hopper of weighing allows Calibrated markings t=0:
If 1. the first parallel-moving type gate 5-8 weighing hopper 5-1 closes and puts in place, represent first and weigh hopper 5-1 in original state;
If 2. the first parallel-moving type gate 5-8 weighing hopper 5-1 reaches position, hopper of weighing first allows Calibrated markings t to be set to P, represent first and weigh hopper 5-1 just in discharging, first weighs after hopper 5-1 blowing terminates, and closes the first parallel-moving type gate 5-8 weighing hopper 5-1, and the first hopper 5-1 that weighs remains static, allow metering, weighing system metering first is weighed hopper 5-1 tare weight, and the first hopper 5-1 that weighs measures complete, and hopper of weighing first allows Calibrated markings t to be set to 0.
The present invention utilizes automatic information technology, network technology and computer software programming technology and video technique, dock ship bulk material is realized in progressive unloading process to the control system of static weighing.The weighing state of material metage device is combined with device for transporting objects travel position simultaneously, each device is accurately controlled, realize the control to Automatic continuous static weighing.By weighing data being uploaded to automatically the metering management system at measuring control center 13, for production and technique have made strong data supporting.
Metrological operation station 1 is according to the parallel-moving type gate 5-8 on off state of first, second weigh hopper 5-1,5-2, the real-time weight of first, second weigh hopper 5-1,5-2, judge whether hopper of weighing possesses charging condition, this condition is the condition of distributing device 11 and device for transporting objects startup optimization, and the distributing device 11 that charging condition distributing device 11 and device for transporting objects 10 cannot start or be in operation if do not possess and device for transporting objects 10 will stop immediately.
The boats and ships metering entrusted information to be unloaded that measuring control center 13 sends to metrological operation station 1 and " unloading starts " that harbour unloading operation station confirms, this condition is distributing device 11 and device for transporting objects 10 startup optimization condition; This condition can ensure the accuracy of vessel unloading, when condition does not meet, and distributing device 11 and device for transporting objects 10 No starting; When Conditions does not meet in operational process for distributing device 11 and device for transporting objects 10, distributing device 11 and device for transporting objects 10, metrological operation station emergent stopping, ensure that the accuracy of metering.
Metering system of the present invention has the control method of following several situation,
One. device for transporting objects normally stops rear startup
1. the parallel-moving type gate 5-8 of first, second weigh hopper 5-1,5-2 closes and puts in place;
2. the weighing numerical value of first, second weigh hopper 5-1,5-2 is lower than pre-alarm value;
3. information is be sure of in the unloading of boats and ships to be unloaded;
4. metering system is normal.
If meet above four conditions, this metering system normally runs.
The charge car of device for transporting objects distributing device 11 runs to the first hopper 5-1 " A starts station " that weighs to be stopped afterwards, and now provide the automatically controlled run signal of charge car, but do not give charge car travelling speed, subsequent material conveying device starts.S7-300PLC controlling center detects that first weighs hopper 5-1 when having 400 kilogram weights to change, represent that material has transported to first from boats and ships to weigh hopper 5-1, charge car starts from " A station " to " B returns station " slow running, just turn round after arriving " B returns station " and weigh hopper 5-2 operation (in this operational process to second, if the first hopper 5-1 weight of weighing is greater than pre-alarm value, distributing trolley runs to the second hopper 5-2 that weighs at a high speed immediately, arrive the second slow running when weighing above hopper 5-2), charge car arrives second and to weigh above hopper 5-2 and the first hopper 5-1 weight of weighing is stablized, first weigh hopper 5-1 measure gross weight, simultaneously, charge car is weighed on hopper 5-2 second and is run cloth.When the first hopper 5-1 that weighs has measured gross weight, metrological operation station 1 sends to PLC controlling center 7 and opens the first instruction of parallel-moving type gate 5-8 of weighing hopper 5-1, when the first parallel-moving type gate 5-8 weighing hopper 5-1 open put in place 2 minutes after namely the first hopper blowing of weighing is complete, metrological operation station 1 sends closedown first to PLC controlling center 7 and to weigh the instruction of hopper 5-1 parallel-moving type gate 5-8, after the first parallel-moving type gate 5-8 weighing hopper 5-1 closes and puts in place, metrological operation station 1 is measured first and to be weighed hopper 5-1 tare weight, gross weight and tare weight are sent to local metering server 2 and store by metrological operation station 5-1, metrological operation station 1 sends tare weight to PLC controlling center 7 and measures complete signal, the first hopper 5-1 that weighs possesses charging condition,
When first weighs hopper 5-1 in metering process, distributing device 11 runs at the second low speed from " A station " to " B returns station " on hopper 5-2 of weighing, distributing device 11 arrives " B returns station " and turns round afterwards and run to the first hopper 5-1 that weighs, the weigh gross weight of hopper 5-1 of second gross weight and the tare weight weighing technique and first of weighing hopper 5-2 is identical with tare weight weighing technique, and first hopper 5-1 and the second hopper 5-2 that weighs that weighs circulates successively.
Two. metering system is owing to restarting (comprising metrological operation station failure, Failure for Hydraulic Drive Unit, device for transporting objects fault) after fault stopping
(1) after equipment failure elimination, system can start
1. the first parallel-moving type gate of weighing hopper 5-1 closes and puts in place;
2. the second parallel-moving type gate of weighing hopper 5-2 closes and puts in place;
3. first weigh the weighing numerical value of hopper 5-1 lower than high alarming value;
4. second weigh the weighing numerical value of hopper 5-2 lower than high alarming value;
5. information is be sure of in the unloading of boats and ships to be unloaded;
6. system normal (comprising metrological operation station, fluid pressure drive device and device for transporting objects normal).
Device for transporting objects starts, and now provides the automatically controlled run signal of charge car, but does not give charge car travelling speed, and follow-up cantilever sealing-tape machine starts:
If charge car to be weighed on hopper 5-1 and the first hopper 5-1 weight of weighing is less than pre-alarm value first, when first weigh hopper 5-1 detect 400 kilogram weights change time, represent that material has transported to first from boats and ships to weigh hopper 5-1, charge car is weighed from first " A station " to " B returns station " slow running of hopper 5-1, arrive the revolution of " B returns station " charge car to run to the second hopper 5-2 that weighs, in this operational process, if the first hopper 5-1 weight of weighing is greater than first and weighs hopper 5-1 pre-alarm value, charge car runs to the second hopper 5-2 that weighs at a high speed immediately, arrival second is weighed after hopper 5-2, speed reduces to low speed,
If charge car to be weighed on hopper 5-1 and the first hopper 5-1 weight of weighing is greater than pre-alarm value first, when first weigh hopper 5-1 400kg weight change detected time, represent that material has transported to first from boats and ships to weigh hopper 5-1, charge car runs to the second hopper 5-2 that weighs at a high speed immediately, arrival second is weighed after hopper 5-2, and charge car speed reduces to low speed.
If charge car to be weighed on hopper 5-2 and the second hopper 5-2 weight of weighing is less than pre-alarm value second, when second weigh hopper 5-2 detect 400 kilogram weights change time, represent that material has transported to second from boats and ships to weigh hopper 5-2, charge car is weighed from second " A station " to " B returns station " slow running of hopper 5-2, arrive the revolution of " B returns station " charge car to run to the first hopper 5-1 that weighs, in this operational process, if the second hopper 5-2 weight of weighing is greater than second and weighs hopper 5-2 pre-alarm value, charge car runs to the first hopper 5-1 that weighs at a high speed immediately, arrival first is weighed after hopper 5-1, speed reduces to low speed,
If charge car to be weighed on hopper 5-2 and the second hopper 5-2 weight of weighing is greater than pre-alarm value second, when second weigh hopper 5-2 detect 400 kilogram weights change time, represent that material has transported to second from boats and ships to weigh hopper 5-2, charge car runs to the first hopper 5-1 that weighs at a high speed immediately, arrival first is weighed after hopper 5-1, and charge car speed reduces to low speed.
The high alarming value that the present invention is arranged is the value in order to protect measuring apparatus to set, and when reaching high alarming value, distributing device and relevant conveying stockline stop, if after scram, detect that weight is greater than high alarming value, metering system of the present invention can not start.
(2) after equipment failure elimination, system can't start
1. the parallel-moving type gate 5-8 of first, second weigh hopper 5-1,5-2 closes and puts in place;
2. the weighing numerical value of first, second weigh hopper 5-1,5-2 is greater than high alarming value;
3. device for transporting objects is normal;
In such cases, device for transporting objects 10 still can not start, because the first hopper 5-1 weight of weighing is greater than high alarming value or second hopper 5-2 weight of weighing and is greater than high alarming value, first the weigh parallel-moving type gate 5-8 of hopper 5-2 of hopper 5-1 or second that weighs does not open and causes, after now being contacted by phone, metrological operation station 1 is switched to manual mode, manually the metering button clicked in weighing software completes gross weight metering, after having measured gross weight, manual unlocking parallel-moving type gate 5-8 discharging, rear closedown parallel-moving type gate unsnatched by material, get back to fault halted state, start device for transporting objects 10 after material metage device 5 is normal and start discharging, restart material metage device 5 to measure.
The every subnormal stopping of device for transporting objects 10, the distributing device 11 of device for transporting objects 10 all runs to weigh " A starts station " of hopper of correspondence and allows to stop in region.
The normal stop condition of device for transporting objects 10: 1, operating personnel click along stopping button; 2, this batch of unloading that the metering that metrological operation station accepts is entrusted terminates.
Device for transporting objects 10, when running into following situation, needs emergent stopping:
1, operating personnel click scram button;
2, wharf materials conveying device fault;
3, parallel-moving type gate opens or closes time-out;
4, the weighing system communication failure at metrological operation station;
5, the server failure of metering system;
6, Failure for Hydraulic Drive Unit.
Metering system of the present invention and autocontrol method are not only confined to above-described embodiment, in the change done without prejudice to the invention basic structure spiritual principles and control method essence spirit principle, all belong to protection scope of the present invention.
Claims (10)
1. a wharf materials progressive unloading AUTOMATIC STATIC metering system, it is characterized in that: the distributing device comprising device for transporting objects, material metage device, metrological operation station, local metering server, PLC and basic automatization active station, described material metage device comprises first and to weigh hopper, second weighs hopper, first LOAD CELLS group, second LOAD CELLS group, first weighing instrument and the second weighing instrument, described first hopper and second hopper of weighing of weighing is arranged side by side below distributing device, first hopper and second hopper upper end of weighing of weighing is provided with distributing device position proximity sensor for detecting distributing device position, described first LOAD CELLS is mounted on first and weighs hopper lower end, for to first weigh hopper weigh, first LOAD CELLS group is electrically connected with the first weighing instrument, described second LOAD CELLS is mounted on second and weighs hopper lower end, for to second weigh hopper weigh, second LOAD CELLS group is electrically connected with the second weighing instrument, described first, second weigh hopper bucket at the bottom of be respectively equipped with parallel-moving type gate, each parallel-moving type gate is connecting fluid hydraulic driver respectively, hopper of respectively weighing is provided with the position transducer for detecting parallel-moving type shutter opening and closing,
Described PLC comprises PLC controlling center and PLC controls slave station, described PLC controlling center controls slave station by DP network with PLC and is connected, PLC controlling center respectively with the distributing device of device for transporting objects, for detecting the distributing device position proximity sensor of distributing device position, for detecting the position transducer of parallel-moving type shutter opening and closing, the operation valve electrical connection of fluid pressure drive device, for receiving distributing device position signalling and parallel-moving type shutter opening and closing signal, and control distributing device and fluid pressure drive device, described PLC controls slave station, first weighing instrument is connected with metrological operation station by serial server with the second weighing instrument, metrological operation station is used for reading the signal and first that PLC controls slave station in real time, the data of the second weighing instrument display, and for by data storing to local metering server, described basic automatization active station is connected with PLC controlling center by Ethernet, for control PLC main website and PLC slave station.
2. wharf materials progressive unloading AUTOMATIC STATIC metering system according to claim 1, it is characterized in that: first, second LOAD CELLS group described is equipped with multiple LOAD CELLS, and described multiple LOAD CELLS is the lower end that matrix form is distributed in first, second hopper of weighing.
3. wharf materials progressive unloading AUTOMATIC STATIC metering system according to claim 1 or 2, it is characterized in that: the described first weigh hopper and the second upper end of weighing hopper is rectangular parallelepiped, bottom is multiple trapezoidal discharge ports, each trapezoidal discharge port is equipped with a parallel-moving type gate, and described parallel-moving type gate adopts opposite opened hydraulic gate.
4. wharf materials progressive unloading AUTOMATIC STATIC metering system according to claim 1, is characterized in that: described distributing device position proximity sensor is located at the first " A start station ", " B returns station ", " C limit station " and second of weighing hopper respectively and is weighed " A starts station ", " B returns station ", " C limit station " of hopper.
5. wharf materials progressive unloading AUTOMATIC STATIC metering system according to claim 1, it is characterized in that: also comprise measuring control center, described measuring control center is connected with metrological operation station.
6. wharf materials progressive unloading AUTOMATIC STATIC metering system according to claim 1 or 5, it is characterized in that: also comprise video monitoring apparatus, described video monitoring apparatus is connected with measuring control center, and video monitoring apparatus is used for carrying out video monitoring to whole vessel unloading metering process.
7. a kind of wharf materials progressive unloading AUTOMATIC STATIC measurement control method according to claim 1, it is characterized in that: the permission that described metrological operation station presets first, second hopper of weighing weighs condition, described metrological operation station weighs the first hopper and second of weighing and to weigh the tare weight first of hopper, described basic automatization active station sends the distributing device starting device for transporting objects to PLC controlling center, for detecting the distributing device position proximity sensor of distributing device position, for the signal of the drive unit of the position transducer and parallel-moving type gate that detect parallel-moving type shutter opening and closing, the distributing device position that distributing device position proximity sensor is detected by DP bus by PLC controlling center, the parallel-moving type shutter opening and closing status signal that position transducer detects is sent to PLC and controls slave station, the instruction in PLC control slave station is read by serial server in metrological operation station, the real-time weight data of the first weighing instrument and the second weighing instrument judges it is meet to allow weighing condition, weighing condition is allowed if meet, PLC controlling center controls distributing device and to weigh loading hopper to first, first loading hopper of weighing terminates, PLC controlling center controls distributing device and shifts to second and to weigh hopper, to weigh loading hopper to second, meet the first gross weight of weighing hopper and weigh condition, the gross weight that hopper is weighed in metering first, and this gross weight is delivered to local metering server, after gross weight has measured, metrological operation station controls slave station through PLC and opens to the transmission of PLC controlling center the instruction that the first parallel-moving type gate of weighing hopper carries out blowing, after blowing terminates, metrological operation station controls slave station through PLC and sends closedown first to PLC controlling center and to weigh the instruction of parallel-moving type gate of hopper, meet the first tare weight of weighing hopper and weigh condition, the tare weight that hopper is weighed in metering first, this tare weight is delivered to local metering server, weigh on hopper if distributing device is positioned at first, according to first weigh hopper weigh gross weight, tare weight control method weigh gross weight, the tare weight of the second weighing bucket, by first weigh hopper and second weigh hopper replace weighing realize wharf materials progressive unloading AUTOMATIC STATIC metering.
8. wharf materials progressive unloading AUTOMATIC STATIC measurement control method according to claim 7, it is characterized in that: described distributing device runs from " A station " to " B returns station " that first weighs hopper and carries out cloth, when arrival first weigh hopper " B returns station " after charge car oppositely to second weigh hopper " A starts station " run, arrival second is weighed after hopper, and distributing device runs from " A station " to " B returns station " that second weighs hopper and carries out cloth.
9. wharf materials progressive unloading AUTOMATIC STATIC measurement control method according to claim 7, it is characterized in that: the alarming value of hopper of weighing is preset at described metrological operation station, if when metrological operation station detects that Hopper Weight of weighing is greater than alarming value, metrological operation station controls slave station to PLC controlling center generation alarm through PLC, controls distributing device sail out of this hopper of weighing immediately by PLC controlling center.
10. wharf materials progressive unloading AUTOMATIC STATIC measurement control method according to claim 7, is characterized in that: described metrological operation station is provided with MANUAL CONTROL mode, manually controls to weigh, and typing weighing data.
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| CN201410561892.2A CN104280101B (en) | 2014-10-21 | 2014-10-21 | Wharf materials unloads AUTOMATIC STATIC metering system and autocontrol method continuously |
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| CN113148594A (en) * | 2021-04-14 | 2021-07-23 | 交通运输部天津水运工程科学研究所 | Automatic control system and control method for flow of bulk cargo unloading hopper group at port |
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| CN104280101B (en) | 2016-05-11 |
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