CN104501920A - Digital weighing instrument - Google Patents
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- CN104501920A CN104501920A CN201410781358.2A CN201410781358A CN104501920A CN 104501920 A CN104501920 A CN 104501920A CN 201410781358 A CN201410781358 A CN 201410781358A CN 104501920 A CN104501920 A CN 104501920A
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Abstract
The invention relates to the technical field of weighing and metering, in particular to a digital weighing instrument, which comprises a main board, an extension board, a display operation panel and a box body, wherein the box body is used for fixedly mounting the main board, the extension bard and the display operation panel, the main board is respectively connected with the extension panel and the display operation panel through a first FPC (flexible printed circuit) interface and a second FPC interface, the main board comprises a MCU (microprogrammed control unit) chip, a power source circuit, an external keying circuit, a communication interface circuit and a sensor signal accessing and collecting circuit, the MCU chip is used for processing a signal sent by the sensor signal accessing and collecting circuit, and controlling the external keying circuit and the communication interface circuit, the first FPC interface and the second FPC interface are respectively connected with the two ends of the power source circuit, and the sensor signal accessing and collecting circuit is also connected with an analog resistance strain type sensor and a digital type weighing sensor. The digital weighing instrument has the advantages that an analog signal and a digital signal can be processed, and the wireless digital transmitting and wired digital transmitting are realized.
Description
Technical field
The present invention relates to Weighing technical field, particularly relate to a kind of digital weighing instrument.
Background technology
According to the difference of weighing instrument access load cell signal type, the weighing instrument of prior art is divided into two large classes: a class is the weighing instrument system of simulating signal input, namely one or many artifical resistance strain gauge transducers adopt and joint group scale mode is connected with weighing instrument, the mV level analog electrical signal that sensor exports is carried out the process such as AD collection, amplification, rectification, filtering and send and show or output by weighing instrument internal circuit; The another kind of weighing instrument system being digital signal and inputting, namely one or many digital weighing sensors are by RS485 communication modes and digital weighing Instrument connection, digital sensor built-in AD Acquisition Circuit is treated can directly export RS485 digital signal, digital weighing gauge internal does not have AD Acquisition Circuit, and digital weighing instrument access digital sensor signal waits process send aobvious or export through digital worthwhile.
At present in Weighing field, the weighing instrument system of above-mentioned simulating signal input is very universal, and the weighing instrument system of digital signal input have also been obtained widespread use in the digital truck scale, digital track scale of commerce and trade occasion.The comparative advantages of digital weighing instrument are mainly reflected in: digital and calculation technology replaces traditional simulation and calculation technology, measuring accuracy is higher, fault distinguishing is intuitively easy, can realize exempting to load demarcation (parameters input method), the convenient and swift cost of maintenance and repair is low, antijamming capability is stronger.Digital weighing instrument system is adopted to become the main flow of weighing apparatus production development from now on as the digital electronic weigher of core component.But, the application of the technique electronic scales rare digital weighing instrument system in industry spot production run controls, reason is mainly as follows:
1. the pattern of the existing digital sensor for the weighing apparatus such as truck scale, track scale and the pattern of digital weighing instrument and functional interface can not meet the use needs of industry spot electronic scales to function and reliability; Communications protocol simultaneously between the existing digital sensor for digital electronic weigher and digital instrument is secret, limits the independent assortment of digital weighing instrument and digital sensor.
2. digital sensor manufacture craft is complicated, investment is large, and the LOAD CELLS range in addition for industry spot technique electronic scales is widely distributed, pattern is of a great variety, is difficult to low cost batch production.
3. people generally believe that industry spot technique scale measuring accuracy common demands is not bery high, adopt digital electronic weigher that cost of investment can be caused significantly to improve.In fact, the Weighing equipment of industry spot is often operated in the environment such as high temperature, dust, strong electromagnetic, impact shock, the signal (mV level analog voltage signal) that the simulation LOAD CELLS of these Weighing equipment gathers often needs long range propagation to be just given to weighing instrument again to process, and pickup electrode is vulnerable to interference thus causes the reduction of device systems reliability, work measurement misalignment.Meanwhile, the Weighing equipment adopting analog LOAD CELLS, also owing to adopting and the mode of joint group scale, simulation and calculation, causes and demarcates the difficult and inconvenient maintenance of difficulty, breakdown judge and many drawbacks such as maintenance cost is high.
Existing weighing instrument often needs with wireless data transmission module, receives display etc. and form wireless data sending weighing system, the weighing data wireless remote transmission that weighing instrument acquisition process obtains, and receives display and receives these data and communication exports and controls further.On market, existing reception display often differs greatly on pattern, functional interface etc. design with weighing instrument, poor universality, many drawbacks such as cause working service inconvenience and maintenance cost is high.Existing weighing instrument is all button operation on the spot usually, is difficult to the needs meeting some occasion needs wireless remote weighing operation like this.
Summary of the invention
The object of the invention is to propose a kind of digital weighing instrument, can Analog signals and digital signal, simultaneously also can wireless data sending and wired digital transmission.
For reaching this object, the present invention by the following technical solutions:
A kind of digital weighing instrument, comprise mainboard, expansion board, display operation panel and casing, described casing is for fixedly mounting mainboard, expansion board and display operation panel, described mainboard by first row line interface and second row line interface respectively with expansion board, display operation panel connects, described mainboard comprises MCU chip, power circuit, external bond control circuit, communication interface circuit, standby power supply interface circuit and described sensor signal access Acquisition Circuit, the signal that described MCU chip is imported into for the treatment of sensor signal access Acquisition Circuit, described MCU chip is for controlling external bond control circuit, communication interface circuit, described first winding displacement mouth and the second winding displacement mouth are connected to the two ends of power circuit, described sensor signal access Acquisition Circuit is also connected with artifical resistance strain gauge transducer and digital weighing sensor.
Preferably, described communication interface circuit comprises wireless data sending port and wired digital transmission port.
Preferably, described expansion board comprise the 3rd winding displacement mouth, code device signal acquisition interface circuit, output switch parameter interface circuit, simulation change send output interface circuit, analog input interface circuit and switching value input interface circuit, each circuit is electrically connected with the 3rd winding displacement mouth respectively, and described 3rd winding displacement mouth and the first winding displacement mouth are electrically connected.
Preferably, described display operation panel is provided with the 4th winding displacement mouth, and described 4th winding displacement mouth is electrically connected respectively at keyboard, pilot lamp, display, and described 4th winding displacement mouth and the second winding displacement mouth are electrically connected.
Preferably, described display comprises LED dot matrix basic display unit and LED charactron slave display.
Preferably, described mainboard is also connected with hummer and clock circuit in order to report to the police and the displaying time date.
Preferably, described sensor signal access Acquisition Circuit comprises switch, AD Acquisition Circuit and RS485 digital interface circuit, and described switch is used for the conversion between AD Acquisition Circuit and RS485 digital interface circuit.
Preferably, described external bond control circuit is provided with toggle switch for blocked operation mode.
Preferably, described mainboard 1 also comprises standby power supply interface circuit 16, and described standby power supply interface circuit 16 provides direct current 5V and direct current 12V power supply, can be chosen as the peripherals such as wireless digital broadcasting station, mini-printer and directly power.
Beneficial effect of the present invention:
Sensor signal access Acquisition Circuit of the present invention can access analog and digital transducer, and carries out transmission process to different sensor signals; The external bond control circuit of described mainboard is provided with toggle switch, can conveniently select to switch local operation or Remote operation; Described communication interface circuit can realize the conversion of wireless data sending and wired digital transmission.
Accompanying drawing explanation
Fig. 1 is the internal circuit configuration schematic diagram of the digital weighing instrument that the specific embodiment of the invention provides;
Fig. 2 is the structural representation of the digital weighing instrument that the specific embodiment of the invention provides;
Fig. 3 is the operation panel structural representation of the digital weighing instrument that the specific embodiment of the invention two provides.
In figure:
1, mainboard; 2, expansion board; 3, operation panel; 4, casing; 5, the first winding displacement mouth; 6, the second winding displacement mouth; 7, the 3rd winding displacement mouth; 8, the 4th winding displacement mouth; 11, power circuit; 12, MCU chip; 13, sensor signal access Acquisition Circuit; 14, external bond control circuit; 15, communication interface circuit; 16, standby power supply interface circuit; 17, clock circuit; 18, hummer; 131, switch; 132, AD Acquisition Circuit; 133, RS485 digital interface circuit; 21, code device signal acquisition interface circuit; 22, output switch parameter interface circuit; 23, simulate change and send output interface circuit; 24, switching value input interface circuit; 25, analog input interface circuit; 31, keyboard; 32, display; 33, pilot lamp; 321, LED dot matrix basic display unit; 322, LED charactron slave display.
Embodiment
Technical scheme of the present invention is further illustrated by specific embodiment below in conjunction with accompanying drawing.
Embodiment one
As shown in Figure 1, 2, present embodiments provide a kind of digital weighing instrument, comprise mainboard 1, expansion board 2, display operation panel 3 and casing 4, described casing 4 is for fixedly mounting mainboard 1, expansion board 2 and display operation panel 3, mainboard 1 and expansion board 2 are inserted in the inner lower floor of cabinet 4 and upper strata draw-in groove respectively, and the input and output terminal row of mainboard 1 and expansion board 2 draws through shrouding perforate correspondence after cabinet 4 and identifies.
Described mainboard 1 by first row line interface 5 and second row line interface 6 respectively with expansion board 2, display operation panel 3 connects, described mainboard comprises MCU chip 12, power circuit 11, external bond control circuit 14, communication interface circuit 15 and described sensor signal access Acquisition Circuit 13, the signal that described MCU chip 12 is imported into for the treatment of sensor signal access Acquisition Circuit 13, described MCU chip 12 is for controlling external bond control circuit 14, communication interface circuit 15, described first winding displacement mouth 5 and the second winding displacement mouth 6 are connected to the two ends of power circuit 11, described sensor signal access Acquisition Circuit 13 is also connected with artifical resistance strain gauge transducer and digital weighing sensor.
In the Switching Power Supply that power circuit 11 described in the present embodiment is employing three end off-line type pulse width modulation device (TOP224) and high-frequency transformer composition, high-frequency transformer is elementary to be inputted for 220V exchanges, and secondary totally five tunnels power to respectively after rectifying and voltage-stabilizing mainboard 1, expansion board 2 and display operation panel 3; The MCU chip 12 of described mainboard adopts based on ARM kernel 32 8-digit microcontroller or adopts AVR embedded RISC processor.
Comprise two-way RS232 communication interface, two-way RS485 communication interface in communication interface circuit 15 described in the present embodiment, two-way RS232 communication interface can be selected to arrange and large screen display, computing machine, serial printer connecting communication; Two-way RS485 communication interface can select arrange with wireless digital broadcasting station, RFID card reader connecting communication, or select and host computer inquiry mode carry out exchanges data.
Described sensor signal access Acquisition Circuit 13 comprises switch 131, AD Acquisition Circuit 132 and RS485 digital interface circuit 133, the sensor signal access Acquisition Circuit 13 of described mainboard 1 carries out the separate circuit of two of gating by switch 131, one of them circuit is AD Acquisition Circuit 132, adopt ADS1232 converter, it is 24 sigma-delta bridge type magnetic sensor ADC with the input of dual-channel analog signal, each passage can drive at least 8 350 ohm of analog LOAD CELLS, is sent to MCU after each channel signal processes respectively; Another circuit is RS485 digital interface circuit 133, and this circuit can access digital weighing sensor, is sent to MCU chip 12 after signal transacting.
Embodiment two
On the basis of embodiment one, as shown in Figure 2, described mainboard 1 is also connected with hummer 18 and clock circuit 17 in order to report to the police and the displaying time date; Described expansion board 2 comprise the 3rd winding displacement mouth 7, code device signal acquisition interface circuit 21, output switch parameter interface circuit 22, simulation change send output interface circuit 23, analog input interface circuit 25 and switching value input interface circuit 24, each circuit is electrically connected the 3rd winding displacement mouth 7, and described 3rd winding displacement mouth 7 and the first winding displacement mouth 5 are electrically connected; Described output switch parameter interface circuit 21 arranges four DC5 ~ 24V relays, normally opened contact and normally closed contact optional, can be designed to setting control export or report to the police export; Described simulation becomes send output interface 23 circuit to arrange the mutually isolated 4-20mA output of two-way, to realize data remote; Described switching value input interface circuit 24 can access six way switch amount signals; Described analog input interface circuit 25 can access road 4 ~ 20mA analog input signal.
Described code device signal acquisition interface circuit 21 can access scrambler, be sent to MCU to access signal A phase and B phase transformation to process further, thus the rotation direction (forward or reverse) of recognition coding device connection device and rotating speed reach the object tested the speed; Can realize specially for the weight automatic compensation function of overhead traveling crane electronic scales correct amount metering.Between crown block hook buck stay, former winding wire rope within the roll lengthens or formerly wire rope weight can be increased (releasing state under) when now will be retracted in reel aloft or reduce (under retracted state) to being claimed in the weight of thing, thus the LOAD CELLS being installed in fixed pulley axle head detected, and this weight increasing or reduce is exactly additional weighting error; The size that additional weighting error produces is relevant with the rotation number of turns of reel, and wire rope be applied to by the impost claimed on thing be increase or minimizing relevant with the rotation direction of reel.For fundamentally eliminating this error, a multiturn rotary encoder can be installed to detect revolution and the direction of reel at reel axle head center, send detection signal to weighing instrument by cable and carry out processing and compensating.
Weighing instrument software has rope compensation pattern " closedown " or " startup " option and " ISN display mode " or " scrambler display mode " option, rotary encoder every yard is equivalent to actual how many wire rope weight can by recording with on counterweight or the calibrated weighing instrument of standard substitution.During measuring steel wire rope weight, first close rope compensation pattern, select ISN display mode and cancel Zero-tracking function, before suspension hook declines or rises, press " zero setting " key on weighing instrument makes display show zero, then allow suspension hook from peak toward declining, or from minimum point toward rising, weighing instrument display be exactly when declining or the wire rope in the time of rising actually records gravimetric value.Again weighing instrument is selected scrambler display mode, suspension hook is declined or rises on aforementioned same height and position, the encoded radio from peak to minimum point is obtained from weighing instrument display, wire rope weight will be recorded divided by this encoded radio, just by calculating single encoded gravimetric value, after single encoded gravimetric value is determined, just can carry out the compensation of additive error after weighing instrument starts scrambler compensation model: when suspension hook rising wire rope pack up in reel be involved in time, the weight being applied to LOAD CELLS is more and more less, for keeping weighing instrument displayed value constant, addition compensation is carried out through internal arithmetic according to the data that scrambler measures, otherwise wire rope is released from reel when suspension hook declines, the weight being applied to sensor is increasing, now in order to keep weighing instrument indicating value constant, carries out subtraction compensation according to the data that scrambler measures through internal arithmetic.So through the electronics overhead crane scale that additive error compensates, overcome and require that prerequisite that suspension hook must be in isometry position carries out the limitation of Weighing, achieve well Weighing accurately, convenient and quick.
In the present embodiment, preferably described display operation panel is provided with the 4th winding displacement mouth 8, and described 4th winding displacement mouth 8 is electrically connected with keyboard 31, pilot lamp 33, display 32 respectively, and described 4th winding displacement mouth 8 and the second winding displacement mouth 6 are electrically connected; As shown in Figure 3, described display 32 is Dual-window display, and to adapt to the display of multitask multi information content, one of them is LED dot matrix basic display unit 321, and another is LED charactron slave display 322; Wherein LED dot matrix basic display unit 321 is eight highlighted red LED of 5*7 dot matrix, shows real-time weighing data, and LED charactron slave display 322 is six highlighted LED, can select the information such as displaying time, setting value, flow; Described pilot lamp 33 is for state instruction and instruction of reporting to the police, and pilot lamp 33 quantity is five, carry out respectively running, net weight, zero-bit, the state instruction such as stable and warning; Described keyboard 31 is set to multiplely touch film key, for instrument optimum configurations, adjustment and weighing operation, touching switch key quantity is six, be respectively menu/ESC Escape, confirmation/printing key, removing/left key, peeling/right key, accumulative/upturning key, zero setting/downturning key, for the operation such as optimum configurations, demarcation.
Preferably, described external bond control circuit 14 is provided with toggle switch for blocked operation mode; Toggle switch can conveniently select switching to be local operation or Remote operation, during selection local operation pattern, circuit is directly connected with the keyboard 3.1 of display operation panel 3, and during selection Remote operator scheme, circuit can be connected with additional radio remote control switch.For the electronic scales that overhead travelling crane or Aluminum Multi-function equipments are installed, instrument local operation is often extremely inconvenient, digital weighing instrument when being with Remote operator scheme is selected in the present embodiment, keying circuit 14 accesses six key radio remote control switchs, instrument operation personnel just just can conveniently can be operated instrument long-distance by multikey Digiplex away from instrument end, comprise optimum configurations, meter calibration adjustment, the cumulative printing of peeling removing clearing etc.
Also be provided with relay output interface circuit in the present embodiment to be connected with output switch parameter interface circuit 22 and switching value input interface circuit 24, overload warning and safety control function can be realized.See Fig. 1, mainboard 1 of the present invention is provided with the hummer 18 of more than 80dB, display operation panel 3 is provided with state and alarm lamp 33, expansion board 2 is provided with output switch parameter interface circuit 22 (wherein three relays are chosen as normally closed contact), according to GB12602-90 " the hoisting machinery overload protection device technical specification of security " requirement that State Administration for Quality Supervision and Inspection and Quarantine promulgates, overhead travelling crane, the necessary design and installation load lifting limiter of the hoisting devices such as trestle crane, it is pre-alarm (90% of rated load weight sends sound and light alarm) that its major function requires, (105% of rated load weight continues to send sound and light alarm delayed alarm, time delay 3-5 actuating of relay second, cut-out hoists power supply) and (the 130% relay action immediately of rated load weight of reporting to the police immediately, cut-out hoists power supply), the accuracy requirement of load lifting limiter is display precision≤5%F.S, action error≤3%F.S (at full capacity).When digital weighing instrument in the present embodiment is used for overhead traveling crane Weighing, can either correct amount be realized, functional requirement and the accuracy requirement of aforementioned load lifting limiter can also be realized, avoid the waste of installing load lifting limiter more separately and causing.
In the present embodiment, preferably, described mainboard 1 also comprises standby power supply interface circuit 16, and described standby power supply interface circuit 16 comprises direct current 5V and direct current 12V power interface, can be chosen as the peripherals such as wireless digital broadcasting station, mini-printer and directly power.
In order to adapt to the general wireless data sending application scheme of industry spot, digital weighing gauge internal software design patterns of the present invention has " weighing instrument pattern " and " reception display mode ", so just two instrument one can be set to weighing instrument pattern (being used as weighing instrument), another is set to receive display mode (being used as to receive display), by supporting the use with wireless digital broadcasting station, thus composition wireless data sending weighing system, greatly expand application scenario.
Carry out technical products upgrading for the convenience of the user, reduce technological transformation input and avoid device systems completely newly to replace as far as possible, communication interface 15 in the present embodiment is RS232 and RS485 communication interface, there is multiple kinds to select, comprise general MODBUS rtu protocol, magnificent instrument communications protocol, Ningbo Ke Li instrument communications protocol etc. are shone in plum Teller-Tuo benefit instrument communications protocol, Shanghai.Client only needs to change old instrument and arranges identical with former agreement by the instrument communications protocol upgraded.
More than show and describe ultimate principle of the present invention and principal character and advantage of the present invention.The technician of the industry should understand; the present invention is not restricted to the described embodiments; what describe in above-described embodiment and instructions just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications; these changes and improvements all fall in the claimed scope of the invention, and claimed scope of the present invention is defined by appending claims and equivalent thereof.
Claims (9)
1. a digital weighing instrument, comprise mainboard (1), expansion board (2), display operation panel (3) and casing (4), described casing (4) is for fixedly mounting mainboard (1), expansion board (2) and display operation panel (3), described mainboard (1) by first row line interface (5) and second row line interface (6) respectively with expansion board (2), display operation panel (3) connects, it is characterized in that: described mainboard (1) comprises MCU chip (12), power circuit (11), external bond control circuit (14), communication interface circuit (15) and described sensor signal access Acquisition Circuit (13), the signal that described MCU chip (12) is imported into for the treatment of sensor signal access Acquisition Circuit (13), described MCU chip (12) is for controlling external bond control circuit (14), communication interface circuit (15), described first winding displacement mouth (5) and the second winding displacement mouth (6) are connected to the two ends of power circuit (11), and described sensor signal access Acquisition Circuit (13) is also connected with artifical resistance strain gauge transducer and digital weighing sensor.
2. digital weighing instrument according to claim 1, is characterized in that: described communication interface circuit (15) comprises wireless data sending port and wired digital transmission port.
3. digital weighing instrument according to claim 1, it is characterized in that: described expansion board (2) comprise the 3rd winding displacement mouth (7), code device signal acquisition interface circuit (21), output switch parameter interface circuit (22), simulation change send output interface circuit (23), analog input interface circuit (25) and switching value input interface circuit (24), each circuit is electrically connected with the 3rd winding displacement mouth (7) respectively, and described 3rd winding displacement mouth (7) and the first winding displacement mouth (5) are electrically connected.
4. digital weighing instrument according to claim 1, it is characterized in that: described display operation panel is provided with the 4th winding displacement mouth (8), described 4th winding displacement mouth (8) is electrically connected respectively at keyboard (31), pilot lamp (33), display (32), and described 4th winding displacement mouth (8) and the second winding displacement mouth (6) are electrically connected.
5. digital weighing instrument according to claim 4, is characterized in that: described display (32) comprises LED dot matrix basic display unit (321) and LED charactron slave display (322).
6. digital weighing instrument according to claim 1, is characterized in that: described mainboard (1) is also connected with hummer (18) and clock circuit (17) in order to report to the police and the displaying time date.
7. digital weighing instrument according to claim 1, it is characterized in that: described sensor signal access Acquisition Circuit (13) comprises switch (131), AD Acquisition Circuit (132) and RS485 digital interface circuit (133), and described switch (131) is for the conversion between AD Acquisition Circuit (132) and RS485 digital interface circuit (133).
8. digital weighing instrument according to claim 1, is characterized in that: described external bond control circuit (14) is provided with toggle switch, for blocked operation mode.
9. digital weighing instrument according to claim 1, it is characterized in that: described mainboard 1 also comprises standby power supply interface circuit 16, described standby power supply interface circuit 16 provides direct current 5V and direct current 12V power supply, can be chosen as the peripherals such as wireless digital broadcasting station, mini-printer and directly power.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410781358.2A CN104501920A (en) | 2014-12-16 | 2014-12-16 | Digital weighing instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410781358.2A CN104501920A (en) | 2014-12-16 | 2014-12-16 | Digital weighing instrument |
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| CN104501920A true CN104501920A (en) | 2015-04-08 |
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| CN201410781358.2A Pending CN104501920A (en) | 2014-12-16 | 2014-12-16 | Digital weighing instrument |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107144331A (en) * | 2017-05-27 | 2017-09-08 | 厦门亿克赛尔仪表科技有限公司 | A kind of small weighbridge instrument of New-type mould revolution |
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| CN2165432Y (en) * | 1993-08-14 | 1994-05-18 | 陈瑞增 | Digital counting wireless transmission type receiving display for weighing ergograph |
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Application publication date: 20150408 |