CN1026436C - Microcomputer controlled nucleon operated belt conveyor scale - Google Patents
Microcomputer controlled nucleon operated belt conveyor scale Download PDFInfo
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- CN1026436C CN1026436C CN 89109044 CN89109044A CN1026436C CN 1026436 C CN1026436 C CN 1026436C CN 89109044 CN89109044 CN 89109044 CN 89109044 A CN89109044 A CN 89109044A CN 1026436 C CN1026436 C CN 1026436C
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Abstract
The present invention relates to a microcomputer nucleon belt scale which is composed of a probe, an A-shaped frame, a speed meter, a radiation source, a microprocessor (a intellectualized host computer), etc. The present invention is especially suitable for the on-line measurement of the weight of continuous flowing materials by a belt conveyer or other conveyors. The microprocessor has the functions of static calibration, dynamic calibration, a software rate scale, automatic zero regulation, automatic printing, etc. and can automatically display various parameters, such as cumulative quantity (ton and kilogram), flow quantity (kilogram/second), load (kilogram/meter), belt speed, intercept, slope rate, etc. The microprocessor nuclear scale has the advantages of full function, small source strength, low price, simple and convenient calibration, stable performance, etc.
Description
The present invention is a kind of microcomputer controlled nucleon operated belt conveyor scale, and it belongs to the Application of Nuclear Technology intelligence instrument, is the device that is used for continuous flow material online weighing.
3,278, No. 747 patents that on October 11st, 1966, U.S. Patent Office announced, 3,361, No. 911 patents of U.S. Patent Office on January 2 nineteen sixty-eight all are the patents of uclear scale, as in the IAEA-SM-159/19 of International Atomic Energy Agency, have discussed uclear scale.Utilize the nuclear radiation principle to survey and deliver weight of material on the belt conveyer, has bigger superiority than belted electronic balance, as easy for installation, the precision height, life-span is long, do not need flight-line maintenance etc., disclose with computer technology process nuclear radiation absorption intensity in West Germany DE3228844A1 " nuclear radiation absorption intensity linearization technique " patented claim by name and to have measured the travelling belt weight of material, after weakening, nuclear radiation absorption intensity linearization technique and radioactivity make full use of the design of radioactive source, but fail the concrete technical scheme of open this design of enforcement, the deficiencies in the prior art part is:
(1) the main frame intellectuality of .DE328844A1 does not have concrete technical scheme.
(2). radioactive source and belt material detector support, to fix, detection range can't be regulated, and can not maximally utilise radioactive source and further guarantee measuring accuracy.
(3). the belt material detector mainly contains ionization chamber, three kinds of scintillation counter and G-M counter tubes, preceding two kinds of complex manufacturing, it is huge to pop one's head in, the circuit precision is numerous and jumbled, and performance is difficult for stable, costs an arm and a leg, the general user is with not rising, influence is promoted the use of, and the G-M counter tube is many combinations, and expense is big, problems such as failure rate is many, and the life-span is short.
Purpose of the present invention designs exactly a kind ofly makes detector with the G-M counter tube, and has simple in structurely, and Installation and Debugging are convenient, precision is high, the life-span is long, it is little to radiate source strength, and field dose is low, and is cheap, the intellectual controlled nucleon operated belt conveyor scale of being convenient to promote.
Its ultimate principle of controlled nucleon operated belt conveyor scale of the present invention is the nucleonics method, measures the material charge capacity on the transmission belt, when the gamma-rays of radioactive source emission passes material, because of shielding action, gamma intensity will with the increase by material thickness weaken.For passing the gamma intensity I that material thickness is dm, be according to the pass of nuclear physics principle between the two:
I＝I
0e
-μmPmdm
Wherein, I
0For by the gamma intensity before the material of dm thickness;
μ m is a mass absorption coefficient
Pm is a density (unit: Kg/m
3)
Dm is the material thickness (unit: m) that ray passed
For the measuring object of uclear scale, the material on the travelling belt, but the inventory on the Pmdm representation unit area.Unit is Kg/M
2, then: Pmdm=L/W
Wherein: W is a belt width
L is the inventory (Kg/m) on the travelling belt of unit length, and in addition, gamma-ray intensity I is recorded by the belt material probe of the uclear scale form with pulsimeter digit rate n, becomes thereby measure relational expression: n=n
0Exp(-μ mL/w)
Take the logarithm in the following formula two ends
Lnn＝Lnn
0-μml/W
From then on formula as can be seen, in practice, in case measurand determines that instrument installs, it transmits the width W of material, the mass absorption coefficient μ M of measurand and the transmitted intensity n when unloaded
0, be constant all just, they can be decided by calibration.Cross the load-carrying transmitted intensity n of transmission as long as measure transmission like this, just can measure the inventory L on the unit length travelling belt.
The present invention is mainly by gamma ray projector, and material probe bracket, tachogenerator and smart host input-output unit etc. are partly formed, and its synoptic diagram is seen accompanying drawing 1, and division is as follows in conjunction with the accompanying drawings:
Radioactive source: used γ radiation source is caesium-137(C
137 Cs) 30 years half life period, gamma-rays amount 0.660Mev(million electron volt (MeV)) leaves in the aluminum container, carrying shield is Φ 120 * 160mm right cylinder, carrying shield is except shielding γ source, outside the effect of protection ray, the gamma-rays that the γ source is emitted can be transmitted on the required detecting location collimatedly, therefore, carrying shield should have certain shielding thickness (60mm) and offer 7 at the carrying shield downside " * 40 ° taper collimating aperture; project material on the travelling belt through the gamma-rays of collimating aperture; the probe via the belt below receives, and measures.
Probe: probe comes down to a survey sensor, and it becomes pulse signal to the gamma-rays of receiving, and flows to smart host.One of G-M counter tube or two are housed in the probe; prime amplifier and quenching circuit; they all are encapsulated in the steel cylinder of Φ 160 * 1200mm, and cylinder has lucifuge, effects such as shielding, dustproof, mechanical protection; the probe support of packing into; in the steel cylinder of bottom, support is the supporting mechanism between γ source and the probe, is steel structure support; it organically is combined into one γ source and probe, to guarantee the relative geometry position between γ source and the probe.Like this when belt between γ source and probe by the time, just can make on the material that gamma-rays scan-type ground irradiation carries to belt, carry out transmission measurement.
Support: for adjusting the intensity that the γ source shines probe, the support first half is a doorframe shape, and parallel dragging track is housed, and the γ source can move up and down along track, is used for adjusting the distance between γ source and the probe.The γ carrying shield is fixed on two ends and has on the supporting plate of slide rail, and slide rail is embedded on the doorframe track, and fastener is housed, and makes fixed distance between γ source and the detector by fastener, sees accompanying drawing 2.
Tachogenerator: the belt speed measuring meter is made up of a magnet and a swiveling wheel that two small coil are housed, divide the bossing and the pole pair of gear of tooth punctual when swiveling wheel, the magnetic flux maximum of magnetic loop, when the recess of gear is aimed at magnetic pole, the magnetic flux minimum of magnetic loop, the variation of magnetic flux induces the pulse signal that frequency is f on coil, the size of frequency f is directly proportional with belt speed Vt:
f＝A· (V
t)/(πD) (HZ)
In the formula: the five equilibrium number of teeth (60) of A-swiveling wheel
The diameter (0.1m) of D-friction roller
Then:
V
t＝ (πD)/(A) ·f＝ (0.1π)/60 f（m/s）
Vt is the mass flow of unit interval
F＝L·V
Accumulation inventory P ∫
t oL-Vdt
The intelligence instrument main frame: the uclear scale main frame comes down to a signal Processing maincenter, and main frame adopts NIM standard plug-in unit cabinet, and main frame contains three unit of dc power signal processing and Signal Spacing, and 3 branches are described below below in conjunction with accompanying drawing:
DC power source unit is that line voltage is changed into the used direct current high-low pressure of native system, and series regulator is adopted in the design of this power supply.Line voltage is through the bipolar voltage low pass filter.Eliminating electric network noise as far as possible disturbs.Carry out rectification by the rectification diode then after the transformer buck, electrochemical capacitor filtering is again through three terminal integrated voltage stabilizer or zener diode, output ± 5V, ± 12V ,-250V ,+50V.
Signal processing unit is to be the computer circuits of core with eight bit microprocessors; it has replaced the cumbersome analog operational circuit of conventional instrument; not only make the stability of circuit; reliability improves greatly; simultaneously operational precision is improved greatly; except the microcomputer basic circuit; program storage device; archival memory; outside Timer and the D/A converting circuit; also designed the input of special probe signal; interface circuit archival memory power down protection circuit and program fly the back automatic restoring circuit, have increased these circuit and have just made this element circuit become perfect signal Processing smart circuit.It promptly has the long-term memory ability of information, can adapt to the influence of external environmental interference again, and the discovery faults itself is in time got rid of.
Main frame has very strong man-machine conversation ability (printer interface, operation keyboard, nixie display), makes the operation of instrument become more convenient, directly perceived, flexible.The user can revise and the assignment procedure parameter at any time according to field condition, and starts corresponding program as required.It gathers data processing and other relevant numerical operation, digital-to-analog conversion by software program to probe and the next signal of tachogenerator.On software, also set up the fault self-diagnosis program, can find the fault of each one of uclear scale (interface) with them.
Signal Spacing follower unit is the chief component of this main frame, is to aim at the control device that prevents from connecting the instrument system back.Ground wire string by electric signal advances to disturb and designs.If do not set up this unit, in case string advance to disturb instrument will be provided accurately, stable signal, all that has been achieved is spoiled to make the measurement of whole uclear scale.
What invention was adopted is the electromagnetic isolation of single magnetic jar.At first will convert proportional with it square wave oscillation signal to from the voltage signal of the next 0-5V of signal processing unit with electric voltage/frequency converter, go out square wave with the pulsewidth symmetry by the d type flip flop shaping then, this signal is coupled to output by electromagnetic isolation again, outputting oscillation signal is divided into two-way, one the tunnel through rectification, the circuit that is filtered into the back provides power supply, another road telecommunications converts proportional with it voltage analog to by frequency, after the output of voltage/current device.
Accompanying drawing 4 is measuring system general procedure block diagrams of uclear scale main frame.
Program was at first carried out self-diagnostic program after main frame powered on, and in the self diagnosis service memory demonstration, keyboard, printer, signal input, output interface was checked, if find fault, then reflected by status indicator lamp.Under normal circumstances, program continues to carry out interrupts, and the initialization of internal storage state judges that then command word M(imports by keyboard), the path of deciding next step program to carry out thus.
Carry out during M=0 and measure operation program, accompanying drawing 5 is to measure the operation program process flow diagram, and it at first carries out digital filtering to probe signal.Carry out then that belt load, speed, material are measured and the computing of corresponding output voltage amount and to carrying out automatic or semi-automatic correction zero point, the radioactive source decay is mended and tasted processing, n is the average counter rate of the probe umber of pulse of coming in the accompanying drawing 5.
F: the average pulse frequency that tachogenerator comes
A: belt load intercept-calculate by calibration the first time, by the keyboard input, later on from normal moveout correction.
B: the belt load slope, calculate the keyboard input by calibration
A: the tachogenerator slope, producer provides the input of 0.0052 keyboard
K
1: load output voltage slope
K
2: load input voltage intercept
K
3: load flow output voltage slope
K
4: load flow output voltage intercept
K
1, K
2, K
3, K
4, make the keyboard input by using according to the Belt Flow range
Z: zero point the mode word, the semi-automatic school of Z=0 zero: Z=1, the school zero; The Z=2 automatic zero adjustment.
T: the radioactive source attenuation compensation time interval (unit: day) the keyboard input
The T1/2 radioactive source half life period, right
137C
sIt is 30 * 365(day)
Behind the t radioactive source attenuation compensation, elapsed time, computing machine is calculated
Carry out static calibration program during M=1, accompanying drawing 6 is that the calibration of online static calibration program flow diagram is exactly the relation of determining to survey between the electric signal that physical quantity and instrument measurement arrive, the nuclear instrument of counting tubular type is because probe output is a pulsed, it is to be related to whole accuracy of instrument that the umber of pulse of coming popping one's head in is carried out really accurate mensuration, traditional approach is with the scaler of purchasing specially, this not only increases expense (3000-4000 unit/platform), and often exist the relative deviation of two instrument on measuring, influence the precision of measurement instrument.
Uclear scale of the present invention, fully the utilization microcomputer is on the basis that does not increase any hardware, realize the online static calibration of uclear scale with software, before this program of execution, calibration time T and printing type P must be imported by keyboard, this program is at first removed counting accumulated value A and calibration number j, then judges the load input not, deposit the Lj unit in after the load input, program is to the probe count value A+n → A that adds up, after the calibration time arrives, to the count value that adds up, take the logarithm, ask average, send into the LNj unit, i.e. LNj ← 1/TLnA, and calculating linear regression intermediate variable B=B+LNj, C=C+Lj, the calibration number adds 1, and j+1 → j send j the unit, does declaring the operation key then press not? if press, then continue to judge new charge capacity Lj input not, repeat above step, if press the operation key, then carry out linear regression and calculate b=∑ (Lj-C/T(LNj-BT)/∑ (Lj-C/T)
2, a → 7(B-bc)/T deposits slope respectively in.Among intercept unit b and a, judge printing type P at last, P=1 does not print b, a, and P=0 prints, and carries out the back commentaries on classics and goes execution to measure operation program
In the accompanying drawing 6: A: counting accumulated value unit
The count value storage unit that n:1 pops one's head in and come second
T: calibration setting-up time
Lj: the charge capacity of input
LNj: accumulating values logarithm memory cell
J: a calibration value counter j=0,1,2 ... K
P: printing type word P=0 prints, and P=1 does not print
During M=2, carry out the dynamic scaling program, accompanying drawing 7 is program flow diagrams of dynamic scaling, except that above-mentioned calibrating method, under the situation of field condition restriction, can take the dynamic scaling method, and the design philosophy of dynamic scaling is according to the belt load cumulative amount
V wherein: belt speed; S: the distance of belt process; T: the time that belt passes through; L: the charge capacity on the unit strap length; F: the pulsed frequency that tachogenerator comes.(can by automobile, train weighing on weighbridge, track scale) also can obtain S and ∫ as long as the material total amount of knowing belt in advance transmitted before calibration
T oFL
nSlope b and intercept a that ndt just can generate belt load automatically come, that is:
When program was carried out, the batch gross weight P by keyboard input precognition during program run, at first removed the frequency accumulated value of tachogenerator, the material probe counting rate accumulated value of taking the logarithm.And the time accumulated value, judge then whether the belt filled head comes quality probe place, is set to, and then carries out other program; After arriving, delayed time for 1 second, the tachogenerator frequency adds up, and sends into the FA supplies of unit probe counting rate value of taking the logarithm and adds up and send DN the unit, and the time adds up and send T the unit, judges then whether belt material tail goes over.If cross, repeat above-mentioned work, in the past, then calculate the distance that belt is passed by, the P when then re-executing omnipresence belt sky
1, FA, DN, T four parameters at last according to the slope and the intercept of aforesaid system of equations computational load, are sent into the corresponding b and a unit of computing machine, calibrate EOP (end of program) in batches to this, and calibration process also finishes fully thereupon.
In the accompanying drawing 7, FA: tachogenerator frequency accumulated value
DN: the material probe counting rate accumulated value of taking the logarithm
A: the slope of tachogenerator, keyboard input
N: the count pulse number that the quality probe comes is provided by counter
F: surveyed the pulsed frequency that sensor comes, and provided by counter
P: the belt gross weight of precognition, keyboard input
DNF: to take the logarithm integrated value with the tachogenerator frequency product of quality probe counting rate
T: time accumulated value
B: load slope
A: load intercept
S: the distance that belt is passed by
Digital ratemeter: counting rate meter is that the circuit classic method of pulse number in the unit interval (counting rate) is to adopt pump circuit in mimic channel, whereby the pulse signal transition is become DC current, indicate with ammeter then, its shortcoming is that the amplitude and the width of paired pulses all has strict demand, so often produce than mistake by pulse height or width difference, counting rate is not directly participated in computing simultaneously, increased intermediate link F, the L conversion, this brings error to measurement again, has increased the reaction time, makes the instrument response time slack-off, the present invention then is that the software function with computing machine has designed digital ratemeter, accompanying drawing 8 is program flow diagrams of digital ratemeter, in the present invention, on hardware, adopted just programmable/marginal along flip-flop number, make unrestrictedly, ensured the accuracy of pulse value the signal pulsewidth; The principle of having taked simultaneously the simulation pump circuit on software is carried out filtering with the pulse of gathering and is obtained comparatively stable average counter rate and show by digital form.Its disposal route is to take out umber of pulse per 1 second from edge able to programme flip-flop number, is sent to the region of memory of opening up in advance, and this zone is to select size according to the reaction time of the on-the-spot needs of user, and its form is the formation form of first in first out.The poke of this memory field is asked on average,
=(L)/(M)
Draw the average counter rate in nearest a period of time, send into N for demonstration and calculating usefulness, thereby finish counting rate meter work.
In the accompanying drawing 8:
As pulsimeter digit rate acquisition zone plot, the computer-internal setting
M: gather counting rate number (acquisition zone length, reaction time) keyboard input 1-100S
A(i): real i the counting rate i=1,2,3 that adopts ... M
T: the current time unit that takes: second Ac: current collection address
Automatic and semi-automatic school zero: the uclear scale probe is installed in the scene, owing to reasons such as environment, temperature mechanical shock, strong-electromagnetic fields, make the meter probe running status change probably, influence measuring accuracy, mainly be reflected as the load zero drift, in order to overcome this influence, we have increased by zero processing of automatic and semi-automatic school on software, and according to formula L=(Ln-a)/(b) wherein: L is a belt load, a is an intercept, b is a slope, when L=0, and a=1nn.School zero is exactly to recomputate intercept one time.
(1). automatic zero adjustment is handled
When Z=2, main frame enters the automatic zero adjustment state.
Accompanying drawing 9 is automatic zero adjustment program flow diagrams, computing machine changes according to charge capacity, and judging belt has non-loaded dummy status, carries out school zero automatically and handles, handle and show that L is zero, deposits the LnN that calculates in a unit when belt actual loading L just carries out school zero during less than the LMIN value.Otherwise carry out other program.
Wherein LMIN is the belt load minimum value, imports (unit K g/M) by keyboard before operation
(2). handle in semi-automatic school zero: key entry Z=0 carries out semi-automatic school zero when the belt dry running, accompanying drawing 10 is semi-automatic school zero handling procedure process flow diagrams, semi-automatic school zero and automatic zero adjustment difference are that the each school of this method zero intervened by the people, and belt must turn round during school zero, also to key in strap length simultaneously, calculating the required time with belt speed and strap length, is in order to calculate the average zero point that belt turns around like this
Deposit a unit in, it is more accurate that handled zero point.
In the accompanying drawing 10, PL: the length that belt turns around
TL: the time that belt turns around
T: school zero run time
B: load intercept
Z: school zero mode word Z-1 is school zero not
Description of drawings
Accompanying drawing 1 is the nuclear scale system synoptic diagram
Accompanying drawing 2 is that source container is connected rack assumption diagram with probe
Accompanying drawing 3 is a uclear scale main machine structure block diagram
Accompanying drawing 4(1) is nuclear scale system master routine software architecture diagram
Accompanying drawing 4(2) is timing in 1 second interrupt service routine process flow diagram
Accompanying drawing 5 is for measuring main program flow chart
Accompanying drawing 6 is static calibration program flow diagram
Accompanying drawing 7 is the dynamic scaling program flow diagram
Accompanying drawing 8 is the digital ratemeter program flow diagram
Accompanying drawing 9 is the automatic zero adjustment program flow diagram
Accompanying drawing 10 is semi-automatic school zero program flow diagram
Wherein: 1 source container; 2. material is popped one's head in; 3. source container is connected support with the material probe; 4. tachogenerator; 5. instrument main frame; 6. source container supporting plate; 7. belt; 8. door cabinet shape source container sliding rail; 9. DC power source unit; 10. signal processing unit; 11. Signal Spacing output unit.
Claims (6)
1, a kind of microcomputer controlled nucleon operated belt conveyor scale, comprise: the gamma-rays radioactive source, gamma ray detector, support, tachogenerator, intelligence instrument main frame and input-output unit, wherein gamma ray detector adopts the adapt G-M counter tube of length of single or two and belt width, technology such as prime amplifier and external quenching circuit, it is characterized in that: the uclear scale support first half has the door shape sliding rail of regulating between microphone source and the detector apart from usefulness, microphone source and container thereof are on the pallet that is fixed on the sliding rail, by pallet moving on sliding rail, regulate the distance between radioactive source and the detector, the instrument main frame is arranged on three kinds of duties and selects: static calibration; Dynamic scaling; Supervisor software is handled in digital ratemeter, the empty school zero of automatic or semi-automatic band.
2, according to the described microcomputer controlled nucleon operated belt conveyor scale of claim 1, after it is characterized in that the normal also initialization of main frame self diagnosis situation, judge the numerical value of command word M, when M=0, carry out and measure operation program, ask average counter rate, belt speed, mass flow, cumulative weight and corresponding output quantity; During M=1, carry out static calibration program, key in calibration time and printing type word; When M=2, carry out the dynamic scaling program, key in gross weight P.
3, according to the described microcomputer controlled nucleon operated belt conveyor scale of claim 1, it is characterized in that the program software design of digital ratemeter, it is the umber of pulse that obtains from the edge flip-flop number that can compile p.s..Be sent to the region of memory of opening up in advance, this zone is that to select its size, its form according to the reaction time of on-the-spot needs be the formation form of first in first out, umber of pulse with M that this region of memory is deposited, obtain the average counter rate in nearest a period of time, N=1/ (M)
, again N deposited in the internal memory input, supply the usefulness of demonstration and calculating.
4, according to the described microcomputer controlled nucleon operated belt conveyor scale of claim 1, when it is characterized in that automatic zero adjustment is the belt load L that calculates of main frame less than given load minimum value Lmin, load L is shown as zero, and with the LnN that calculates, deposits load intercept a unit in; When the belt dry running, semi-automatic school zero is to key in Z=0, calculates the intercept mean value 1nN that belt turns around
o=1/ (TL) ∫
TL OLnNdt deposits a unit in.
5, according to the microcomputer nuclear scale of claim 1, it is characterized in that having the working procedure of static calibration, when M=1, key in known belt load amount, after the charge capacity input was deposited in the Lj unit, the time T by keying in advance calculated ln(1/ (T)
TNdt): deposit the LNj unit in, thereafter carry out repeatedly (K time) again and change the belt load amount, and key in it, just can in internal memory, draw one group of Lj, LNj parameter, after obtaining K charge capacity, press the operation key, main frame carries out linear regression and calculates, obtain the slope and the intercept of load, and deposit b and a unit respectively in, forward M=0 then to and carry out the measurement operation program.
6, according to the described microcomputer nuclear scale of claim 1, it is characterized in that dynamic scaling is when M=2, arrive main frame P1 unit by keyboard input precognition gross weight, and tell when the main frame stub bar arrives detecting location, main frame is received the stub bar of key entry behind signal, counting to tachogenerator adds up and send FA the unit, add up after material probe counting rate taken the logarithm and send DN the unit, time is carried out timing add up and send T the unit, after the material tail, by the main frame of keyboard announcement, after main frame is learnt, the slope and the intercept of solving an equation and obtaining load according to above four parameters, and deposit b and a unit respectively in forward M=0 then to and carry out and measure operation program.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 89109044 CN1026436C (en) | 1989-12-06 | 1989-12-06 | Microcomputer controlled nucleon operated belt conveyor scale |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 89109044 CN1026436C (en) | 1989-12-06 | 1989-12-06 | Microcomputer controlled nucleon operated belt conveyor scale |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1052372A CN1052372A (en) | 1991-06-19 |
| CN1026436C true CN1026436C (en) | 1994-11-02 |
Family
ID=4857844
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 89109044 Expired - Fee Related CN1026436C (en) | 1989-12-06 | 1989-12-06 | Microcomputer controlled nucleon operated belt conveyor scale |
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| Country | Link |
|---|---|
| CN (1) | CN1026436C (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1039160C (en) * | 1995-06-16 | 1998-07-15 | 北京清大电子仪器联合公司 | Small sensible weight and high precision belt nuclear balance |
| CN103649734A (en) * | 2010-09-30 | 2014-03-19 | 上海英迈吉东影图像设备有限公司 | Point-by-point scanning device and method uesd in X ray imaging |
| CN105136270A (en) * | 2015-10-21 | 2015-12-09 | 北京金日新事业技术有限公司 | Nuclear scale fault diagnosis device and using method |
| CN112697240B (en) * | 2020-12-04 | 2021-11-26 | 华南农业大学 | Package dynamic weighing equipment and weighing method thereof |
| CN112985551A (en) * | 2021-02-06 | 2021-06-18 | 安徽新华学院 | Electronic belt scale electrical parameter testing method based on virtual instrument |
| CN113932894B (en) * | 2021-10-14 | 2022-07-22 | 卢宗奎 | Segmented zero-point modular belt scale based on tension detection and compensation |
-
1989
- 1989-12-06 CN CN 89109044 patent/CN1026436C/en not_active Expired - Fee Related
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|---|---|
| CN1052372A (en) | 1991-06-19 |
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