CN1073523A - High-precision single-side weighing method and device - Google Patents
High-precision single-side weighing method and device Download PDFInfo
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- CN1073523A CN1073523A CN 91111410 CN91111410A CN1073523A CN 1073523 A CN1073523 A CN 1073523A CN 91111410 CN91111410 CN 91111410 CN 91111410 A CN91111410 A CN 91111410A CN 1073523 A CN1073523 A CN 1073523A
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- belt
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Abstract
Can realize the method and apparatus of accurately weighing to loose shape or packed goods, which comprises at least: the frame as Weighing Area claims frame, measuring motion, device for measuring force, interface circuit and computing machine, this device is divided into two subregions, material buffer district and Weighing Area, title frame one end of Weighing Area is fixed on the support with bearing or knife rest, and the other end acts on the load transducer, with measuring motion Weighing Area is divided into the N five equilibrium, the whole process of Weighing Area as long as material is passed by, its weight is promptly measured accurately, and metering process is not subjected to the influence of belt tension and speed, and is irrelevant with the material distribution situation, the precision height, cost is low, and installation is adjusted easy, is applicable to metering and blending process in all belts transportations.
Description
The present invention relates to a kind of method of brand-new belt weighing and the device of metering and batching, it can be to various diffusing shapes, bulk or bagged material realize weighing or preparing burden continuously or intermittently supply, are applicable to any industry that needs the belt feeder batching and need to measure in the belt transmission.
At present existing produce and the transportation loading and unloading process in employed belt conveyer scale and burden balance mainly contain two kinds: roller-type and cantilevered, the principle of work of roller-type is that one or more carrying rollers are placed under the skin band, detect the weight of the suffered material of belt on this carrying roller with load transducer, detect the speed of belt simultaneously, obtain mass flow, again each mass flow is constantly made integration, draw the total amount of material, this method has produced problems, mainly be: the factor that influences weighing precision is many, as the degree of tightness of belt, and the levels of precision of setting height(from bottom) and angle, the size of running deviation value, the quality of machining etc.Therefore the technical requirement height is installed and is adjusted maintenance difficult, and complex structure costs an arm and a leg.Cantilevered can be divided into two kinds of single swing arm type and double cantalever types again, single swing arm type is that scale body and belt drives motor etc. is installed as one, as now having produced the single-cantilever belted electronic balance of use, adopted the method for single-cantilever scale body continuous measurement, this just requires belt travelling speed V and unit interval feeding coal Q all to keep constant, weight of material Q1 is a constant on the unit length thereby make, and often adopting the method for transferring Q to make the product of Q1 and V in actual use is constant, keeps accurate measurement.But in application process, because Q1 is a unsettled parameter, so in long-time running, often cause that owing to inhomogeneous feed the material center of gravity moves, and causes error in dipping.The single swing arm type belt conveyer scale can't be eliminated the vibration error that the material impact causes simultaneously, has influenced measuring accuracy.Present existing double cantalever type belt conveyer scale, owing to be that band conveyor and material are measured simultaneously, overcome the shortcoming of single-cantilever structure from principle, but also still exist some defectives, vibration as the belt drives motor, increased the complicacy of circuit simultaneously owing to 2 to 4 sensors of employing, and the conforming matching problem of a plurality of sensor also can influence system accuracy and stability.In addition, if do not adopt specific material loading control and metering method, double cantalever type also can't be eliminated material and impact the vibration error that causes, and adopts specific material loading control and metering method can make its range of application that significant limitation is arranged.In a word, because scale structure unreasonable makes existing belt conveyer scale weighing precision be difficult to improve, and machinery and electrical structure are all too complicated, and it is all very difficult that Installation and Debugging are keeped in repair.
The objective of the invention is to adopt brand-new design philosophy, all simple and clear design of a kind of mechanical electric and metering method are provided, and the precision height, cost is low, and it is all very easy that adjustment is installed in manufacturing, the belt measuring apparatus that the scope of application is extensive.This method has overcome the existing existing shortcoming of various belt weighing structures from principle, make weighing precision not be subjected to the influence of belt tension and belt speed, simultaneously, whether the mode of movement of material is continuous, whether material distributes even, and the vibration of the vibration of material loading process and motor can not influence weighing precision.
Principal character of the present invention is:
Adopt one-sided subregion, the method of section metering realizes the accurate measurement of material in the belt transmission course, the device that the present invention relates to is to claim belt section on the frame as Weighing Area the frame belt, the frame belt claims an end of frame to support with bearing or knife rest, the other end act on pull-type or the pressure type device for measuring force on, a certain material for optional position on the Weighing Area can both make device for measuring force produce weight signal, and outside Weighing Area, the weight of material does not produce any effect to device for measuring force.Simultaneously, in that being housed on the belt or on the belt pulley, belt walks the measurement mechanism of the line length or the belt pulley anglec of rotation (as circle grating or other kinds code-disc), this measurement mechanism is (convenient for setting forth, hereinafter to be referred as measuring motion) effect be whenever pass by one section regular length or belt pulley of belt turns over a fixing angle, measuring motion promptly sends a pulse signal, like this when belt is passed by the length of whole Weighing Area, measuring motion sends N pulse signal altogether, that is to say that measuring motion can be divided into the N five equilibrium to whole Weighing Area.Corresponding, every pulse of measuring motion, measure weighing-up wave one time, when the pass by whole process of Weighing Area of continuous or single material, the actual weight value of this material, be exactly N weighing results sum divided by { K(N+1) }, or each weighing results is divided by { K(N+1) } summation again, and wherein K is a proportionality constant, and it is determined in the position under the Weighing Area by device for measuring force, so the position of measuring motion can influence measuring accuracy arbitrarily and not.
For guaranteeing the weighing precision of device involved in the present invention, whole device can be divided into two districts, the frame belt claims that a side of the supporting-point of frame is a Weighing Area, claim that at the frame belt opposite side of the supporting-point of frame is the material buffer district, belt drive is equipped with in the material buffer district, the shared belt of material buffer district and Weighing Area, Weighing Area and material buffer district be a shared carrying roller or a belt pulley that is fixed on the title frame bearing support in the junction, this carrying roller or belt pulley rise isolates and supporting role, make the vertical vibration of material loading process material and the vibration of drive motor can not influence Weighing Area, make material enter Weighing Area reposefully simultaneously.
Method and principle involved in the present invention are as follows:
If when measuring motion sends pulse, measure the weight signal and the addition successively of device for measuring force at every turn, and the size of this signal is relevant with this material present position, be that weight signal is directly proportional with the arm of force (promptly this material claims the distance of the supporting-point of frame to the frame material), so, when a certain material with belt from the supported end of Weighing Area to the device for measuring force lateral movement and cover the whole process of Weighing Area, this weight of material signal sum is:
S＝KW/N+2KW/N+3KW/N+....+（N-1）KW/N+NKW/N <1>
Wherein: S is the weight signal sum; W is the actual weight of this material; K is a constant, is determined in the residing position of Weighing Area by device for measuring force.
Obviously,＜1〉the N item of formula ordered series of numbers and be:
K（W/N+2W/N+3W/N+....+（N-1）W/N+NW/N）＝KW（N+1） <2>
Therefore:
S＝KW（N+1） <3>
According to＜3〉formula, then have:
W＝S/｛K（N+1）｝ <4>
According to＜1〉formula and＜4〉formula:
W＝｛KW/N+2KW/N+3KW/N+....+（N-1）KW/N+NKW/N｝/｛K（N+1）｝ <5>
Or:
W＝（KW/N）/｛K（N+1）｝+（2KW/N）/｛K（N+1）｝+....+（NKW/N）/｛K（N+1）｝ <6>
From＜5〉formula or＜6〉formula as can be seen, the actual weight value of this material is exactly N weighing results sum divided by { K(N+1) } or each weighing results divided by { K(N+1) } summation again.Because N and K are known, thus if the whole process of this material process Weighing Area in transmission course, the actual weight value of this material just can be obtained accurately.
When material continuously or when a plurality of material is arranged, the weight signal of the device for measuring force result that to be these materials act on respectively at the diverse location of Weighing Area, just the weight of these materials is respectively to the stack of device for measuring force effect, therefore, no matter whether material is continuous, as long as material is through the whole process of Weighing Area, its actual gravimetric value always can accurately draw.And algorithm is identical.
In actual applications, aforementioned algorithm can be finished by computing machine or microprocessor, and very easy, only need after receiving the pulse signal of measuring motion, to the device for measuring force sampling, the voltage signal of device for measuring force is transformed to digital signal by input interface circuit, input computing machine or microprocessor.Just can draw the actual weight of material.
As can be seen, device involved in the present invention has the not available superiority of many existing conveyer belt scales on the above-mentioned principle:
Algorithm at first used in the present invention is simply accurate, and the weighing process need not added any condition, only requires that material covers the whole process of Weighing Area, and this purpose of belt transportation just.Owing to accurate algorithm is arranged, could guarantee the high precision of weighing.In addition, as can be seen, in the weighing process, weight signal only may increase gradually on the principle, and can not increase suddenly in a recurrent interval.Therefore, for the strong jamming in the external world, no matter be mechanism or electric, computing machine is easy to identification and is eliminated, thereby has also guaranteed the high precision and the stability of weighing.
Secondly, device involved in the present invention and belt speed and tension force are irrelevant, and simultaneously, the distribution of material and continuity can not influence weighing precision yet, are suitable for the various diffusing shapes of weighing, bulk, or bagged material, and the application scenario is extensive.Device involved in the present invention also has simple in structure, and cost is low, installs, and adjusts and safeguard advantage very easily.
The present invention can be further understood by following embodiment, and accompanying drawing is simplification and schematic:
Fig. 1: schematic diagram side view
Fig. 2: schematic diagram top plan view
Fig. 3: actual device figure
Fig. 4: circuit theory diagrams
Among the figure: 1A. drive pulley 1B. belt pulley 2. claims the frame counterweight
3A. claim frame supporting-point carrying roller 3B. carrying roller 4. frame belts to claim frame
5. belt stretcher 6. sensor shield and briquetting 7. sensor base installing plates
8. sensing station is finely tuned 9. load transducers, 10. underframe
11A. claim frame supporting-point support 11B. drive wheel bracket 12. driving motors
13A. driving wheel bearing 13B. claims frame bearing 13C. belt pulley bearing
14A. belt drives axle 14B. claims frame bolster 14C. Pulley shaft
15A. drive pulley 15B. drive of motor belt pulley 16. optical code disk outer covers
17. optical code disk 18. reducer casinges 19. reinforcement framves
20. input interface electrical equipment 21. computing machines 22. show and print
23. control and drive unit 24. servo control mechanisms
One end of frame formula belt scale frame (4) is bearing on axle (14B) and the title frame supporting-point support (11A) by bearing (13B), the other end is supported by pressure type load transducer (9), claim the upper frame supporting-point carrying roller (3A) that claims of frame supporting-point support (11A) to being Weighing Area between the belt pulley (1B), drive belt pulley (1A) to claiming to be the material buffer district between the frame supporting-point carrying roller (3A), material drops to the buffering area generation from the top vibration interference can not have influence on weighing precision, and steadily operation of material when arriving Weighing Area, at Pulley shaft (14C) optical code disk (17) is installed, the effect of optical code disk (17) is when belt pulley rotates, whenever turn over a fixed angle, optical code disk (17) namely sends a pulse signal, correspondingly, belt pulley whenever turns over a fixing angle, the belt regular length of also passing by. Like this, just whole Weighing Area is divided into the N five equilibrium by optical code disk (17). The pulse signal that optical code disk (17) sends is at every turn all imported computer (21). Simultaneously, the weighing-up wave of load transducer (9) output also is input to computer (21) by input interface circuit (20), whenever computer (21) is received an optical code disk signal, just to load transducer signal (9) once sampling. When being claimed that material enters Weighing Area from buffering area, metering beginning (that is to say that the at this moment output of load transducer (9) just has non-" 0 " signal), until material falls, metering process is finished, the whole process of Weighing Area as long as material is passed by, the weight of this material is namely come out by accurate weighing, and for moving material, the only stack of dispersed material, superposition is finished by load transducer, this shows, whether whether the weighing precision of apparatus of the present invention and belt tension are irrelevant, and be irrelevant with belt speed, continuously evenly irrelevant with distribution with material, simultaneously, because belt drive is installed in the material buffer district, therefore, the vibration of motor (12) and reduction box (18) can not exert an influence to weighing precision yet, as previously mentioned, material falls to also weighing precision not being had impact. Therefore, influential belt claim the deadly defect of precision all to be overcome, thereby greatly improved weighing precision. In addition, as long as the fineness of optical code disk is enough, the number of times of N can be set arbitrarily by computer after the belt tensioning, so, the machining accuracy of mechanical part there is not any special requirement, it is more easy that installation is adjusted. In addition, owing to only used a load transducer, simultaneously, because algorithm is simple, only need to use a miniature calculating Machine just can be finished weighing and control work, so just makes the cost decrease of whole device.
Fig. 3 provides an embodiment of apparatus of the present invention, for guaranteeing the Charge Mixture Control precision, has adopted reducer casing (18) transmission in this device, for intensity and the installation carrying roller of strengthening the buffer zone two stands, reinforcement frame (19) has been installed.For guaranteeing physical strength, make load transducer be operated in the optimum linear district simultaneously, claim that except that claiming at the frame belt to be equipped with on the frame (4) most frameworks and support all adopt light-duty I-shaped structure or concave structure the frame counterweight (2).Claim frame (4) and underframe (10) to go up at the frame belt and reserve mounting hole, making sensor shield and briquetting (6) can be installed in the frame belt claims 2 on the frame to 4 positions, and sensor base mounting blocks (7) also can correspondingly be installed on the underframe (10), sensing station fine setting (11) is housed on the sensor base mounting blocks (7), so just can under the situation that guarantees weighing precision, be connected with other the next transmission or Storage appts..Obviously, underframe partly can disconnect.
Fig. 4 has provided circuit theory diagrams, among the figure except that optical code disk (17) and computing machine (21), other parts are prior art and common apparatus, servo control mechanism (24) with dashed lines frame, be because because apparatus of the present invention scope of application is very big, can adopt multiple prior art to carry out Charge Mixture Control, when the proportioning accuracy requirement was very high, material loading can adopt the control of step-by-step movement feed.Using optical code disk is an example of the present invention, as long as fineness is enough, the device of any measurement length and angle is all applicable.Equally, in not unconventional scope of the present invention, can utilize some equivalent technologies for its various parts.
Claims (4)
1, can be to particle or Powdered, block and packed goods are realized the device of accurate belt weighing and batching, comprise at least: the frame belt as Weighing Area claims frame, measuring motion, device for measuring force, interface circuit and computing machine is characterized in that:
---claim belt section on the frame as Weighing Area the frame belt, the frame belt claims an end of frame to support with bearing or knife rest, the other end act on pull-type or the pressure type device for measuring force on, a certain material for optional position on the Weighing Area can both make device for measuring force produce weight signal, and outside Weighing Area, the weight of material does not produce any effect to device for measuring force, and the weight signal of device for measuring force is imported computing machine by interface circuit
---in that belt is housed on the belt or on the belt pulley walked the measurement mechanism of the line length or the belt pulley anglec of rotation (as circle grating or other kinds code-disc), the effect of this measurement mechanism (abbreviation measuring motion) is whenever pass by one section regular length or belt pulley of belt turns over a fixing angle, measuring motion promptly sends a pulse signal, and the input computing machine, measuring motion can be divided into the N five equilibrium to Weighing Area.
2, device according to claim 1, it is characterized in that to have two districts, the frame belt claims that a side of the supporting-point of frame is a Weighing Area, claim that at the frame belt opposite side of the supporting-point of frame is the material buffer district, belt drive is equipped with in the material buffer district, the shared belt of material buffer district and Weighing Area, Weighing Area and material buffer district be a shared carrying roller or a belt pulley that is fixed on the title frame supporting-point support (11A) in the junction, the effect of this carrying roller or belt pulley and buffer zone is to make the vibration of the vertical vibration of material loading process material and belt drive can not influence Weighing Area, makes material enter Weighing Area reposefully simultaneously.
3,, it is characterized in that the formula that can realize＜5 according to the device of claim 1〉or formula＜6 algorithm, formula＜5〉or formula＜6 be respectively:
W＝｛KW/N+2KW/N+3KW/N+....+（N-1）KW/N+NKW/N｝/｛K（N+1）｝ <5>
Or:
W＝（KW/N）/｛K（N+1）｝+（2KW/N）/｛K（N+1）｝+....+（NKW/N）/｛K（N+1）｝ <6>
Wherein: W is the material actual weight, and KW/N+2KW/N+3KW/N+....+(N-1) KW/N+NKW/N } be the actual value of weighing sum.
4,, it is characterized in that device for measuring force can be installed in the optional position under the Weighing Area and not influence weighing precision according to the device of claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91111410 CN1029334C (en) | 1991-12-09 | 1991-12-09 | High-precision single-side weighing method and apparatus thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91111410 CN1029334C (en) | 1991-12-09 | 1991-12-09 | High-precision single-side weighing method and apparatus thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1073523A true CN1073523A (en) | 1993-06-23 |
| CN1029334C CN1029334C (en) | 1995-07-12 |
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ID=4910628
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 91111410 Expired - Fee Related CN1029334C (en) | 1991-12-09 | 1991-12-09 | High-precision single-side weighing method and apparatus thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1029334C (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1308553C (en) * | 2004-01-19 | 2007-04-04 | 徐小群 | Load restriction controller with two hoisting dots and four sensors |
| CN103640907A (en) * | 2013-12-05 | 2014-03-19 | 重庆市酉阳县酉好化肥有限公司 | Accurate-metering charging device |
| CN104236686A (en) * | 2014-09-12 | 2014-12-24 | 杭州中南电子工程有限公司 | High-precision electronic belt scale |
| CN109141589A (en) * | 2018-08-23 | 2019-01-04 | 珠海青禾电子有限公司 | A kind of weighing method effectively reducing error |
| CN112697240A (en) * | 2020-12-04 | 2021-04-23 | 华南农业大学 | Package dynamic weighing equipment and weighing method thereof |
-
1991
- 1991-12-09 CN CN 91111410 patent/CN1029334C/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1308553C (en) * | 2004-01-19 | 2007-04-04 | 徐小群 | Load restriction controller with two hoisting dots and four sensors |
| CN103640907A (en) * | 2013-12-05 | 2014-03-19 | 重庆市酉阳县酉好化肥有限公司 | Accurate-metering charging device |
| CN103640907B (en) * | 2013-12-05 | 2016-01-13 | 重庆市酉阳县酉好化肥有限公司 | Accurate measurement charging device |
| CN104236686A (en) * | 2014-09-12 | 2014-12-24 | 杭州中南电子工程有限公司 | High-precision electronic belt scale |
| CN109141589A (en) * | 2018-08-23 | 2019-01-04 | 珠海青禾电子有限公司 | A kind of weighing method effectively reducing error |
| CN112697240A (en) * | 2020-12-04 | 2021-04-23 | 华南农业大学 | Package dynamic weighing equipment and weighing method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1029334C (en) | 1995-07-12 |
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