CN203798428U - Tare removing belt weigher based on electromagnetic force balance - Google Patents
Tare removing belt weigher based on electromagnetic force balance Download PDFInfo
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- CN203798428U CN203798428U CN201420097742.6U CN201420097742U CN203798428U CN 203798428 U CN203798428 U CN 203798428U CN 201420097742 U CN201420097742 U CN 201420097742U CN 203798428 U CN203798428 U CN 203798428U
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- carrying roller
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- electromagnetic force
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Abstract
The utility model relates to a tare removing belt weigher based on electromagnetic force balance. The tare removing belt weigher based on electromagnetic force balance comprises a metering carrier roller as well as front and rear supporting carrier roller which are arranged under a conveying belt, wherein two shaft ends of the metering carrier roller are respectively connected with an electromagnetic weighing unit, the electromagnetic weighing unit comprises a base, a load weigh transmitting mechanism and a closed-loop controller, the base comprises a bottom side and a folded side which is vertically connected with the bottom side is provided with a permanent magnet, and the folded side is provided with a light emitter; the load weight transmitting mechanism comprises a load device and a coil arranged below the load device, the coil is arranged on the periphery of the permanent magnet, and the load device is provided with a light receiver; and the closed-loop controller is respectively connected with the light emitter and the coil. The tare removing belt weigher basic eliminates the influence of a tare system on weighing precision, and has particularly prominent advantage in belt conveying continuous metering of low-discharge small-density materials such as biomass.
Description
Technical field
The utility model relates to a kind of belt conveyer scale, and especially a kind of peeling pipe belt scale based on electromagnetic force equilibrium, for measuring the material load on belt conveyor.
Background technology
Belted electronic balance is a kind of weigher, be installed in the middle part of band conveyor, the in the situation that in not, fracture flowing, large solid-state bulk material is carried out to the Intelligent Dynamic scale of continuous dynamic weighing, as a kind of common measurement device, be widely used in the industries such as metallurgy, coal, chemical industry, building materials, electric power.
At present, conditional electronic belt conveyer scale is that the metering carrying roller realization by being arranged between two supporting carrier rollers is weighed, Fig. 1 is a kind of structural representation of known belted electronic balance, in figure, belt 1.1 is arranged on supporting carrier roller 1.2,1.9, is provided with a metering carrying roller 1.3, wherein between two supporting carrier rollers 1.2,1.9, the height of supporting carrier roller 1.2,1.9 is fixed, and the height of metering carrying roller 1.3 can be adjusted as required.
The loading measurement section of belted electronic balance shown in Fig. 1 comprises sensor 1.7, and its stiff end 1.8 is fixed on pedestal, on the other end, by one end of screw and supporting plate 1.5, fixes, and one adjusts the external part that termination 1.4 is fixed on supporting plate 1.5.Every belted electronic balance at least has the described loading measurement section of two covers, this loading measurement section is connected with the two axial ends of metering carrying roller 1.3, and can adjust the height that measures carrying roller 1.3, allow the supporting carrier roller 1.2,1.9 of the belted electronic balance in using and metering carrying roller 1.3 remain in same plane.When belt 1.1 convey materials, material, through metering section, measures carrying roller 1.3 and just the weight change of material can be detected, and metering carrying roller 1.3 is passed to sensor 1.7 by axle head through adjustment termination 1.4, supporting plate 1.5 this weight.By sensor 1.7, produce corresponding electric signal, this electric signal is delivered to instrument or computing machine, then according to the speed of belt, just can calculate the flow of material.
The gravimetry principle of above-mentioned load sensor 1.7, is the distortion that relies on sensor 1.7, and the foil gauge in sensor 1.7 also changes shape when sensor deforms simultaneously.The change of this shape has caused the variation of foil gauge resistance, and deformation is larger, and resistance variations is larger.The principle of recycling electric bridge, just can be converted to the variation of resistance the subtle change of voltage.So the subtle change of voltage has just reflected the size of gravity.
Belt conveyer scale optimum condition is in theory: require metering carrying roller 1.3 and supporting carrier roller 1.2,1.9 to form a plane, and supporting carrier roller 1.2,1.9 and metering carrying roller 1.3 are remained at grade, make the pulling force of belt 1.1 can not cause extra positive or negative pressure to metering carrying roller 1.3, to guarantee the measuring accuracy of belted electronic balance.And load sensor 1.7 stressed after, certainly lead to again distortion, this distortion is downward, metering carrying roller 1.3 also sinks thereupon, has so just destroyed the plane of above-mentioned metering carrying roller 1.3 and supporting carrier roller 1.2,1.9 formation.
But, because the axle head of the metering carrying roller 1.3 of the belt conveyer scale of the known configurations shown in Fig. 1 is to be fixed on the cantilever end of supporting plate 1.5 by adjusting termination 1.4, when metering carrying roller 1.3 is subject to the gravity F that material is applied thereto
gtime, the supporting plate 1.5 that cantilever arranges will produce larger deflection, and the common deflection of sensor 1.7 and supporting plate 1.5 will affect the measuring accuracy of belt conveyer scale greatly.
Because precision, intensity and the dimensional accuracy of supporting plate 1.5 are compared and also differed larger with sensor 1.7, therefore, in actual use, because above-mentioned many factors causes measuring the deflection of carrying roller 1.3, to be far longer than the deflection of sensor 1.7 compression end in actual use, and wayward and adjustment, this problem has been destroyed the plane of above-mentioned metering carrying roller 1.3 and supporting carrier roller 1.2,1.9 formation, has had a strong impact on measuring accuracy.In addition, due to gravity F
gdifferent, the deflection of supporting plate 1.5 cantilever ends is also different, therefore measuring error is one and is difficult to definite error, for uncertain deflection, in instrument, cannot compensate, thereby cause known belt conveyer scale, its real degree of accuracy (in use) is difficult to reach be better than ± 1% (± 10 ‰), and the even error having is larger, and this structure has seriously hindered the further raising of accuracy of belt scale.
At little density material low discharge belt feeder, carry under operating mode especially, the measuring accuracy of conditional electronic belt conveyer scale is very low, is difficult to meet production requirement.
The key that the belt conveyer scale of weighing of little density will be resolved is the accounting problem of weight of material signal and tare weight signal in the signal output of sensor.Little density material has larger volume to determine must select the conveyor that bandwidth is larger, need accordingly the weight scale bridge that configuration deadweight is larger and select sensors of large measurement range, cause useful weight signal output very little, the amounts of impact such as resolution of follow-up signal treatment circuit outwardness common mode interference, circuit noise and A/D converter, when input signal hour, when impact measures certain effect or plays a leading role, will have a strong impact on normal metering; In another External System inherent error, the existence of the absolute error of larger tare weight signal formation, usually can " flood " less weight signal Weighing cannot be completed.
At the especially little low discharge material belt feeder of some density, carry under operating mode, need effective material load of measuring to account for below 10% of LOAD CELLS range, have a strong impact on normal metering, do not meet < < GB/T7721-2007 continuous integration Automatic balance (belted electronic balance) > > 5.4.2 bar, for speed belt scale and how fast belt conveyer scale, the minimum instant cleaning liquid load of weighing unit should be not less than 20% requirement of maximum capacity.Therefore, for little density low discharge material belt feeder, carry the metering under operating mode, peeling is heavily to improve the vital factor of measuring accuracy.
Application number is that the Chinese patent of 200810023913.X has been invented a kind of belt scale weighing synchronous peeling method Weighing technology and equipment, this patent arranges tare weight sensing device by the conveying belt reverse-running section in belt conveyer scale frame apart from positive process section LOAD CELLS preset distance position, can be after belt balance weighing operation, recording carrying conveying belt is by the gross weight data of positive process section LOAD CELLS and the tare weight data of unloaded conveying belt process reverse-running section tare weight sensing device, according to conveying belt travelling speed and described predetermined running, apart from trying to achieve conveying belt, by LOAD CELLS, moved to the retardation time of tare weight sensing device again, finally with the gross weight data of real time record, deduct the tare weight data of record retardation time, net weight data after being removed the peel.In the method, the load that LOAD CELLS is measured has comprised tare weight load, under little density material low discharge operating mode, can not solve the systematic error that tare weight causes greatly and cause the problem that measuring accuracy is low.
The patent No. is that the Chinese patent of ZL200810023868.8 has been invented a kind of belt balance weighing subsection decortication method measurement technology and equipment, this patent is settled the first induction mark thing by precalculated position on the conveying belt of belt conveyer scale, monitoring device and pulse tachogenerator are set in the frame of belt conveyer scale, record the overall pulse number that in time interval that the above first induction mark thing of conveying belt is detected for twice and this time interval, pulse tachogenerator sends; Whole circle conveying belt is pressed to the average segmentation of predetermined quantity, and overall pulse number is divided into the numbering pulse group corresponding with segmentation; Record respectively tare weight and the gross weight of each segmentation; Order deducts respectively corresponding tare weight by the segmentation gross weight of each numbering pulse group, and the net weight of each section of tape transport material is cumulative, obtains the gross weight of convey materials.In the method, the load that LOAD CELLS is measured has also comprised tare weight load, under little density material low discharge operating mode, can not solve the systematic error that tare weight causes greatly and cause the problem that measuring accuracy is low.
From above, the load of the sensor measurement of existing belt conveyer scale has included tare weight load, what peeling weighing method adopted is that computing method are rejected tare weight, can not eliminate the existence of the absolute error of larger tare weight signal formation, be not suitable for Belt Conveying online weighing under large tare weight, little net weight operating mode and measure.
Summary of the invention
The utility model object is to overcome above-mentioned the deficiencies in the prior art and a kind of peeling pipe belt scale based on electromagnetic force equilibrium is provided, the tare weight that this belt conveyer scale can active balance material, the net weight of Measurement accuracy load.
The technical scheme that realizes the employing of the utility model object is: a kind of peeling pipe belt scale based on electromagnetic force equilibrium comprises metering carrying roller, be located at respectively front support carrying roller and the rear support carrying roller of described metering carrying roller front and back, described metering carrying roller, described in front support carrying roller and rear support carrying roller, be located at belt conveyor below, described belt conveyor is provided with speed metering units, the two axial ends of described metering carrying roller connects respectively electromagnetism weighing unit, described electromagnetism weighing unit comprises base, load weight transmission mechanism and closed loop controller, described base comprise the base be located on carrying plane and with described base flanging connected vertically, described base is provided with permanent magnet, described flanging is provided with optical receiver, the coil that described load weight transmission mechanism comprises load device and is located at described load device below, described coil is positioned at described permanent magnet around, and described load device is provided with optical transmitting set, described closed loop controller is connected with described coil with described optical receiver respectively.
In technique scheme, between described base and carrying plane, be provided with adjusting screw(rod).
In technique scheme, described load device is a loading plate, and the below of described loading plate is provided with metal shaft core, and described coil is placed on described metal shaft core; Or described load device comprises loading plate and the lower loading plate being fixedly connected with described upper loading plate, and the below of described lower loading plate is provided with metal shaft core, and described coil is placed on described metal shaft core.
In technique scheme, also comprise the stopper slot moving in the horizontal direction for limiting described coil, described permanent magnet and coil are all positioned at described stopper slot.
In technique scheme, described optical transmitting set is light emitting diode, and described optical receiver is difference photodiode.
While using the utility model, first optical transmitting set and optical receiver are returned to zero, when belt conveyor is unloaded, the electric current in regulating winding, makes optical transmitting set and optical receiver in same plane, and now, the in the situation that of pure tare weight, electromagnetism weighing unit can be not stressed.
While loading material on belt conveyor, the belt that weight of material causes sinks to being returned to light condition after the electromagnetic force equilibrium between coil and permanent magnet, and back and front supporting carrying roller and metering carrying roller are remained at grade, make the pulling force of belt can not cause extra positive or negative pressure to metering carrying roller, avoided changing the Accuracy to weighing measurement because belt sinks to causing belt tension, guaranteed the measuring accuracy of belted electronic balance.
Electromagnetism weighing unit of the present utility model has been eliminated in prior art the problem that distortion that distortion due to supporting plate cantilever end substantially exceeds sensor itself produces uncertain deflection, can realize under the effect of material gravity on belt, the axle head, the sensor compression end place that guarantee to measure carrying roller can not be out of shape, therefore, the more existing belted electronic balance of the utility model has improved measuring accuracy greatly.The utility model can be eliminated the impact of tare weight systematic error on weighing precision, on the Belt Conveying continuous measurement of the little density materials of low discharge such as living beings, has outstanding especially advantage.
Accompanying drawing explanation
Fig. 1 is the structural representation of existing belted electronic balance.
Fig. 2 is the structural representation of the peeling pipe belt scale of the utility model based on electromagnetic force equilibrium.
Fig. 3 is the structural representation of electromagnetism weighing unit in Fig. 2.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail.
As shown in Figure 2, the peeling pipe belt scale of the utility model based on electromagnetic force equilibrium comprises: front support carrying roller 2.1, metering carrying roller 2.2, rear electromagnetism weighing unit 2.3 and rear support carrying roller 2.4, front support carrying roller 2.1 and rear support carrying roller 2.4 are located on belt frame regularly, both height are non-adjustable, metering carrying roller 2.2 is arranged between front support carrying roller 2.1 and rear support carrying roller 2.4, and the height of metering carrying roller 2.2 is adjustable, the two axial ends of metering carrying roller 2.2 is connected with respectively electromagnetism weighing unit 2.3.Belt conveyor 2.6 is arranged on front support carrying roller 2.1, rear support carrying roller 2.4 and metering carrying roller 2.2.On belt conveyor 2.6, be also provided with speed metering units 2.5.
The structure of electromagnetism weighing unit 2.3 as shown in Figure 3, comprise base 3.1, base 3.1 is " L " type structure, comprise the base 3.1.1 that is located on carrying plane and with described base flanging 3.1.2 connected vertically, flanging is provided with optical receiver 3.9, and base 3.1.1 is provided with permanent magnet 3.3.
The top of permanent magnet 3.3 is provided with load weight transmission mechanism, the metal shaft core that load weight transmission mechanism comprises load device and is located at described load device below, on metal shaft core, be wound with coil, according to electromagnetic induction principle, after coil electricity, metal axle can produce a magnetic field, by sense of current in control coil, can make the direction in this magnetic field identical with the magnetic direction of permanent magnet 3.3, thereby under magnetic fields, load weight transmission mechanism is in " unsettled " state.Load device is provided with optical transmitting set 3.8.Described optical transmitting set 3.8 is connected with closed loop controller 3.11 respectively with described coil.The present embodiment optical transmitting set 3.8 used is light emitting diode, and optical receiver 3.9 used is difference photodiode, and both frequency spectrums mate mutually.
As a kind of embodiment of the present utility model, load device can be a loading plate, and the below of this loading plate is provided with metal shaft core, and described coil is around on described metal shaft core.
As a kind of embodiment of the present utility model, as shown in Figure 3, load device comprises loading plate 3.7 and the lower loading plate 3.6 being fixedly connected with upper loading plate 3.7, optical receiver 3.8 is located on loading plate 3.7, the below of lower loading plate 3.6 is provided with metal shaft core 3.4, and there is coil (not shown) in metal shaft core 3.4 Shangrao.
The course of work of the present utility model is as follows:
First, optical transmitting set 3.8 and optical receiver 3.9 are returned to zero.When belt conveyor 2.6 is unloaded, now only there is tare weight to be carried on electromagnetism weighing unit 2.3, by the size of electric current in regulating winding, make the acting force between coil and permanent magnet 3.3 that load device is suspended into a zero-bit, on this zero-bit position, now, it is zero that coil departs from consistent sensor signal 3.10 from its zero-bit, under zero-bit state, offset current is zero.
When belt conveyor 2.6 loads load, the pressure of the load that upper loading plate 3.7 is subject to increasing on belt, can produce downward skew, thereby drive optical transmitting set 3.8 to move down, the light that now flow to optical receiver 3.9 by optical transmitting set 3.8 changes out measured, and be converted into coil and depart from consistent sensor signal 3.10 from its zero-bit, the signal 3.10 of position transducer is reached closed loop controller 3.11, closed loop controller 3.11 sends offset current 3.12 to coil 3.4, thereby increase the acting force between coil 3.4 and permanent magnet 3.3, increased an electromagnetic compensation power, by the load weight transmission mechanism jack-up that makes progress, until optical transmitting set 3.8 and optical receiver 3.9 are in same plane, return to above-mentioned zeroing position.Under this zeroing position, electromagnetic compensation power and load gravitational equilibrium, according to electromagnetic law of correlation, this electromagnetic compensation power and offset current are proportional.Therefore, according to offset current, can obtain the size of electromagnetic compensation power, thereby obtain the weight of load.The utility model is measured the useful load on belt conveyer scale by the size of metrophia compensation electric current, and tare weight size, on not impact of offset current, has been eliminated the Accuracy that tare weight is measured low loading material too greatly.
The change in optical signal that the utility model receives optical transmitting set 3.8 transmittings by optical receiver 3.9 judges whether belt is subject to the downward pressure that material gravity causes, if load weight transmission mechanism produces skew downwards, the light signal that optical receiver 3.9 receives changes and is passed to closed loop controller 3.11, closed loop controller 3.11 receives the backward coil of detection signal and sends offset current 3.12, under the effect of offset current 3.12, front support carrying roller 2.1, rear support carrying roller 2.4 and metering carrying roller 2.2 return to same plane.Make the pulling force of belt can not cause extra positive or negative pressure to metering carrying roller 2.2, also avoided belt to sink to causing belt tension to change the Accuracy to weighing measurement, guaranteed the measuring accuracy of belted electronic balance.
In order to facilitate 3.1 height of adjusting base, the utility model is also provided with adjusting screw(rod) 3.2 between the base of base 3.1 3.1.1 and carrying plane, by regulating and controlling screw rod 3.2, realize the control to base 3.1 height, be conducive to realize the zeroing to optical transmitting set 3.8 and optical receiver 3.9.
In order to prevent that coil from can produce the displacement of horizontal direction under magnetic fields, electromagnetism weighing unit 2.3 is also provided with the stopper slot 3.5 moving in the horizontal direction for limiting coil, permanent magnet 3.3 is located in this stopper slot 3.5, coil also " unsettled " in stopper slot 3.5.
Claims (5)
1. the peeling pipe belt scale based on electromagnetic force equilibrium, it is characterized in that: comprise metering carrying roller, be located at respectively front support carrying roller and the rear support carrying roller of described metering carrying roller front and back, described metering carrying roller, described in front support carrying roller and rear support carrying roller, be located at belt conveyor below, described belt conveyor is provided with speed metering units, it is characterized in that: the two axial ends of described metering carrying roller connects respectively electromagnetism weighing unit, described electromagnetism weighing unit comprises base, load weight transmission mechanism and closed loop controller, described base comprise the base be located on carrying plane and with described base flanging connected vertically, described base is provided with permanent magnet, described flanging is provided with optical receiver, the coil that described load weight transmission mechanism comprises load device and is located at described load device below, described coil is positioned at described permanent magnet around, and described load device is provided with optical transmitting set, described closed loop controller is connected with described coil with described optical receiver respectively.
2. the peeling pipe belt scale based on electromagnetic force equilibrium according to claim 1, is characterized in that: between described base and carrying plane, be provided with adjusting screw(rod).
3. according to the peeling pipe belt scale based on electromagnetic force equilibrium described in claim 1 or 2, it is characterized in that: described load device is a loading plate, and the below of described loading plate is provided with metal shaft core, described coil is placed on described metal shaft core; Or described load device comprises loading plate and the lower loading plate being fixedly connected with described upper loading plate, and the below of described lower loading plate is provided with metal shaft core, and described coil is placed on described metal shaft core.
4. the peeling pipe belt scale based on electromagnetic force equilibrium according to claim 3, is characterized in that: also comprise the stopper slot moving in the horizontal direction for limiting described coil, described permanent magnet and coil are all positioned at described stopper slot.
5. the peeling pipe belt scale based on electromagnetic force equilibrium according to claim 4, is characterized in that: described optical transmitting set is light emitting diode, and described optical receiver is difference photodiode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420097742.6U CN203798428U (en) | 2014-03-05 | 2014-03-05 | Tare removing belt weigher based on electromagnetic force balance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420097742.6U CN203798428U (en) | 2014-03-05 | 2014-03-05 | Tare removing belt weigher based on electromagnetic force balance |
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| CN203798428U true CN203798428U (en) | 2014-08-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201420097742.6U Expired - Fee Related CN203798428U (en) | 2014-03-05 | 2014-03-05 | Tare removing belt weigher based on electromagnetic force balance |
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| CN (1) | CN203798428U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109238408A (en) * | 2018-09-20 | 2019-01-18 | 南京至泰生物医药科技有限公司 | The high precisely supplementary material meausring apparatus of bio-pharmaceuticals |
| CN113155261A (en) * | 2021-04-13 | 2021-07-23 | 浙江致盛包装科技有限公司 | Material transportation and integrated checkout system of weighing |
| CN114838791A (en) * | 2022-04-01 | 2022-08-02 | 浙江筑工科技有限公司 | High-precision warehousing raw material weighing machine for producing assembly type prefabricated parts |
-
2014
- 2014-03-05 CN CN201420097742.6U patent/CN203798428U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109238408A (en) * | 2018-09-20 | 2019-01-18 | 南京至泰生物医药科技有限公司 | The high precisely supplementary material meausring apparatus of bio-pharmaceuticals |
| CN113155261A (en) * | 2021-04-13 | 2021-07-23 | 浙江致盛包装科技有限公司 | Material transportation and integrated checkout system of weighing |
| CN114838791A (en) * | 2022-04-01 | 2022-08-02 | 浙江筑工科技有限公司 | High-precision warehousing raw material weighing machine for producing assembly type prefabricated parts |
| CN114838791B (en) * | 2022-04-01 | 2023-07-25 | 浙江筑工科技有限公司 | High-precision warehousing raw material weighing machine for producing prefabricated parts |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140827 Termination date: 20210305 |
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| CF01 | Termination of patent right due to non-payment of annual fee |