CN201402176Y - Microcomputer-type dynamic weighting and batching control device - Google Patents
Microcomputer-type dynamic weighting and batching control device Download PDFInfo
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- CN201402176Y CN201402176Y CN2009200892681U CN200920089268U CN201402176Y CN 201402176 Y CN201402176 Y CN 201402176Y CN 2009200892681 U CN2009200892681 U CN 2009200892681U CN 200920089268 U CN200920089268 U CN 200920089268U CN 201402176 Y CN201402176 Y CN 201402176Y
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Abstract
The utility model relates to a weighting device, in particular to a microcomputer-type dynamic weighting and batching control device, which comprise a singlechip. The singlechip is connected with a memory, a system clock, a power, an analog-to-digital converter, a keyboard, a display, a switching value inputting interface and a switching value outputting interface, wherein the analog-to-digital converter is connected with a sensor. When being used for weighting moving materials, the microcomputer-type dynamic weighting and batching control device has high weighting precision and small weighting error.
Description
Technical field
The utility model relates to a kind of meausring apparatus, relates in particular to a kind of microcomputer-based Dynamic weighing and burden control device.
Background technology
Weighing and human being's production, the life closely bound up.Weighing is divided into static weighing and Dynamic Weighting two big classes.The weighing that people run in the daily life mainly is a static weighing, and as platform scale, electronic scale etc., static weighing are to carry out weighing after claiming to reach static balancing between body and the object, and general static weighing technique precision is all than higher.
In the commercial production scene, there are a lot of places to need us in normal operation, to measure the weight of material, and its weight time dependent variable often in this case.For example, in the food industry, when milk powder encapsulates, measure its quality in packaging bag, need not take off from production line and carry out weighing.In forage compounding, often plurality of raw materials need be mixed according to a certain percentage for another example, this batching weighing system that a kind of raw material and other plurality of raw materials are carried out mix in the ratio of prior setting has a wide range of applications in industrial processes, it can carry out weigh batching with various raw material according to the charger sheet of setting in advance in different weighing-appliances.
The utility model content
The purpose of this utility model provides a kind of microcomputer-based Dynamic weighing and burden control device, and it is the weighing precision height when weighing campaign material, and weighing error is little.
For solving the problems of the technologies described above, the utility model comprises: single-chip microcomputer, single-chip microcomputer connected storage and system clock, power supply connects single-chip microcomputer, described single-chip microcomputer connection mode number converter, analog to digital converter connects survey sensor, and single-chip microcomputer connects keyboard and display, and single-chip microcomputer connects switch value input interface and switching value output interface.
Described single-chip microcomputer connects communication interface.
Be connected wave filter between described power supply and single-chip microcomputer.
One week of circuit board that described single-chip microcomputer is connected with other components and parts is established ground wire, and ground wire is connected with digitally exchanging with simulation ground.
Described single-chip microcomputer connects timer circuit.
Series connection punching inductance and tantalum electric capacity, analog to digital converter and survey sensor peripheral hardware shielding case between described analog to digital converter and survey sensor.
Establish photoisolator between described switch value input interface and single-chip microcomputer, establish photoisolator between switching value output interface and single-chip microcomputer.
The utility model adopts shielding case, rationally adopts grounding technology, reduces the random disturbance of extraneous factor to process in weighing with the operational amplifier that hangs down drift, high input impedance high cmrr, has effectively improved the weighing precision for the motion material.
Description of drawings
Fig. 1 is the schematic block circuit diagram of a kind of embodiment of the utility model.
Fig. 2 is the single-chip microcomputer of a kind of embodiment of the utility model and the line graph of analog to digital converter
Embodiment
A kind of embodiment of the present utility model as shown in Figure 1 comprises: single-chip microcomputer, and single-chip microcomputer connected storage and system clock, power supply connects single-chip microcomputer, single-chip microcomputer connection mode number converter, analog to digital converter connects survey sensor, and single-chip microcomputer connects keyboard and display.Single-chip microcomputer connects switch value input interface and switching value output interface.Single-chip microcomputer control algolithm according to the rules, the signal of sending here according to the survey sensor scene carries out computing, according to feeding gate and the Dump gate of operation result by switching value output interface output control mechanical scale.Analog to digital converter converts the output voltage signal of in-site measurement sensor to calculate the function reception digital signal.Survey sensor is converted to voltage signal with the material actual weight in the mechanical scale bucket.Switch value input interface is used to import the state of manual mode switch, signals such as stirring machine time status.The switching value output interface is used to export the feeding gate of control mechanical scale and the switch motion of Dump gate.The switching value output interface connects electric control circuit, and electrical control circuit is directly controlled the action of on-the-spot plant equipment.Electrical control circuit comprises equipment such as manual manipulater, auxiliary reclay, electropneumatic transducer (electromagnetic gas valve) and cylinder.Operating console shows the computer system running status and realizes some operation of system is controlled.Power supply adopts the magnetic resonance alternating current steady voltage plug, and the 220V alternating current is converted to the various voltages of computer operation.Power supply is divided into digital power and analog power, and it is that 9V is after the overcommutation bridge circuit becomes direct current, then through the three proper direct current 5V sources that become after stabilized voltage supply 7805 through transformation that the utility model adopts from alternating current 220V.Analog power is used different transformation windings respectively with digital power, and the two-way power supply does not disturb mutually.Because analog power is comparatively strict to index requests such as voltage ripples, so added more strict filtering measures when design module ground, simulation ground further reduces the ripple of power supply by inductance and tantalum electric capacity.
Single-chip microcomputer adopts the W78E58 chip as shown in Figure 2, a high-resolution A/D converter AD7730 that analog to digital converter adopts ADI company to release, series connection punching inductance and tantalum electric capacity, analog to digital converter and survey sensor peripheral hardware shielding case between analog to digital converter and survey sensor.The SCLK of AD7730, DIN, DOUT, RDY are connected with the I/O mouth of W78E58 chip corresponding function respectively, finish control and data read to AD7730.Establish photoisolator between switch value input interface and single-chip microcomputer, establish photoisolator between switching value output interface and single-chip microcomputer.One week of circuit board that single-chip microcomputer is connected with other components and parts is established ground wire, and ground wire is connected with digitally exchanging with simulation ground.Simulate ground and digitally will be connected on one point, should be located in short circuit, can effectively reduce impedance ground and noise figure like this in the simulation ground and the numeral of chip.Because the resolution of AD7730 is high, noise figure is extremely low, aspect component placement, the simulation part will be separated fully with numerical portion, avoids simulating signal and digital signal to intersect mutually, if necessary intersection then must quadrature.Simulation ground and shop copper layer digitally will cover respectively and enclose all analog elements and digital element.Any signal wire is not laid in AD7730 chip below, and covers and enclose with simulating shakedown copper layer.The crystal oscillator of AD converter and microprocessor need enclose with digitally covering, and as far as possible away from signal wire, the radiation interference influence of avoiding noise that other element of printed board is produced simultaneously.
The utility model has only the antijamming capability that adopts effective ground connection could effectively improve this device, improves the precision of load-bearing, and the basic function of ground connection is as follows:
(1) be the inflow and outflow point of power supply.For disturbing, release interference current by this inflow and outflow point, reduce the influence of disturbing.For power supply, ground is that the electric current of positive supply flows back to a little, is that the electric current of negative supply flows out point.
(2) being the current potential benchmark, is to set up and weigh in the circuit benchmark of quantitative relation between each voltage parameter, and any circuit does not have the benchmark just can't operate as normal.
The cardinal rule of ground connection is as follows:
(1) digital circuit, high frequency analog circuits multipoint earthing nearby.
When signal enters radio band, be easy to aerial emission, the interference of electromagnetic field of circuit at this moment rises to principal contradiction.Just can effectively reduce its emission of inhibition and reduce ground lead resistance.The effective way that reduces lead resistance is exactly to reduce ground path length as far as possible, i.e. ground connection nearby.Though because the influence of electric current on the ground wire, a plurality of earth points have a plurality of different earth potentials, and certain noise margin is all arranged for digital circuit, do not influence the digital circuit operate as normal.
(2) the medium and low frequency mimic channel is wanted one point earth
For the device internal circuit, one point earth is in order to prevent the influence of pressure drop in the common ground impedance, and obviously the ground wire internal impedance can be in the different different pressure drops of place generation by electric current the time during multipoint earthing, thereby cause the earth level difference.(a) is multipoint earthing as scheming wherein, and power supply pressure drop in mind will make two circuit influence each other.For example, the resistance of the printed wire that 10cm is long, 0.3mm is wide is about 8m Ω, the pressure drop that then can produce 80 μ V of 10mA.For the small-signal of 10mV in the native system, its relative value is 0.8%, and this obviously is unallowed.Electric current by r2 is inconstant, may be to exchange or pulse, can't be offset, and also can form positive feedback sometimes and makes the circuit self-excitation.(b) be single-point grounding, can not influence each other between each circuit.
(3) simulation ground in the system, digitally with being connected of power supply ground.
System digitally is connected for any with the method for attachment on simulation ground, but there is strict restriction the position that connects.When the public power supply of digital circuit and mimic channel, when perhaps two power supplys are common ground power supply, should make simulation ground and digitally link to each other at the end place, ground of close primary power.The common ground here mainly refers to a power transformer winding or other intrinsic reason, rather than after be connected together commonly.The reason of this connection be because digitally with simulation ground altogether, earth point is more near primary power, the working current fluctuation that digital circuit forms is more little to the influence of simulation part.When digital circuit and mimic channel used different windings or not public power supply, the position of earth point should be selected in the simulation ground of AD converter and two pin places digitally.Such two parts do not have common return, can not form the phase mutual interference.
As a kind of improvement of the present utility model, single-chip microcomputer connects timer circuit, and timer circuit is the watchdog system based on the CH451 chip, and the pin annexation between single-chip microcomputer and CH451 is a prior art.
When using the utility model, start by switching value Output Interface Control feed arrangement, material enters scale hooper under the effect of self gravitation, by the survey sensor of on hopper, installing, convert the weight change signal of hopper to corresponding with it voltage signal by survey sensor, after amplifier amplifies this voltage signal, send into main control module and carry out data processing, when arriving predetermined value, stop charging, finish quantitative weighing one time.The utility model also can be connected with computing machine by interface, by the Control Software of moving on the computing machine, its error that produces in the weighing process is revised.
Claims (7)
1. microcomputer-based Dynamic weighing and burden control device, comprise: single-chip microcomputer, single-chip microcomputer connected storage and system clock, power supply connects single-chip microcomputer, it is characterized in that described single-chip microcomputer connection mode number converter, analog to digital converter connects survey sensor, and single-chip microcomputer connects keyboard and display, and single-chip microcomputer connects switch value input interface and switching value output interface.
2. a kind of microcomputer-based Dynamic weighing and burden control device according to claim 1 is characterized in that described single-chip microcomputer connects communication interface.
3. a kind of microcomputer-based Dynamic weighing and burden control device according to claim 1 and 2 is characterized in that being connected wave filter between described power supply and single-chip microcomputer.
4. a kind of microcomputer-based Dynamic weighing and burden control device according to claim 1 and 2 is characterized in that establishing ground wire one week of circuit board that described single-chip microcomputer is connected with other components and parts, and ground wire is connected with digitally exchanging with simulation ground.
5. a kind of microcomputer-based Dynamic weighing and burden control device according to claim 1 and 2 is characterized in that described single-chip microcomputer connects timer circuit.
6. a kind of microcomputer-based Dynamic weighing and burden control device according to claim 1 and 2 is characterized in that series connection punching inductance and tantalum electric capacity, analog to digital converter and survey sensor peripheral hardware shielding case between described analog to digital converter and survey sensor.
7. a kind of microcomputer-based Dynamic weighing and burden control device according to claim 3 is characterized in that establishing photoisolator between described switch value input interface and single-chip microcomputer, establishes photoisolator between switching value output interface and single-chip microcomputer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009200892681U CN201402176Y (en) | 2009-03-30 | 2009-03-30 | Microcomputer-type dynamic weighting and batching control device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009200892681U CN201402176Y (en) | 2009-03-30 | 2009-03-30 | Microcomputer-type dynamic weighting and batching control device |
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| Publication Number | Publication Date |
|---|---|
| CN201402176Y true CN201402176Y (en) | 2010-02-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2009200892681U Expired - Fee Related CN201402176Y (en) | 2009-03-30 | 2009-03-30 | Microcomputer-type dynamic weighting and batching control device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105091950A (en) * | 2015-09-22 | 2015-11-25 | 巫占海 | Integrated detector for temperature and object position |
-
2009
- 2009-03-30 CN CN2009200892681U patent/CN201402176Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105091950A (en) * | 2015-09-22 | 2015-11-25 | 巫占海 | Integrated detector for temperature and object position |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: HE'NAN HENGCHANG AUTOMATIC MEASUREMENT EQUIPMENT C Free format text: FORMER NAME: ZHOUKOU HENGCHANG AUTOMATIC CONTROL + MEASUREMENT EQUIPMENT CO., LTD. |
|
| CP01 | Change in the name or title of a patent holder |
Address after: West Shangshui County in Henan province 466100 Station Road, Zhang Hua Patentee after: Henan Hengchang Automatic Measurement Equipment Co., Ltd. Address before: West Shangshui County in Henan province 466100 Station Road, Zhang Hua Patentee before: Zhoukou Hengchang Automatic Control & Measurement Equipment Co., Ltd. |
|
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: Microcomputer-type dynamic weighting and batching control device Effective date of registration: 20120509 Granted publication date: 20100210 Pledgee: Bank of China, Limited by Share Ltd, Zhoukou branch Pledgor: Henan Hengchang Automatic Measurement Equipment Co., Ltd. Registration number: 2012990000189 |
|
| PC01 | Cancellation of the registration of the contract for pledge of patent right |
Date of cancellation: 20130807 Granted publication date: 20100210 Pledgee: Bank of China, Limited by Share Ltd, Zhoukou branch Pledgor: Henan Hengchang Automatic Measurement Equipment Co., Ltd. Registration number: 2012990000189 |
|
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: Microcomputer-type dynamic weighting and batching control device Effective date of registration: 20130807 Granted publication date: 20100210 Pledgee: Chinese bank Limited by Share Ltd Shangshui branch Pledgor: Henan Hengchang Automatic Measurement Equipment Co., Ltd. Registration number: 2013990000550 |
|
| PLDC | Enforcement, change and cancellation of contracts on pledge of patent right or utility model | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100210 Termination date: 20160330 |