CN102389742A - High-precision dispensing equipment and control method thereof - Google Patents
High-precision dispensing equipment and control method thereof Download PDFInfo
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- CN102389742A CN102389742A CN201110234391XA CN201110234391A CN102389742A CN 102389742 A CN102389742 A CN 102389742A CN 201110234391X A CN201110234391X A CN 201110234391XA CN 201110234391 A CN201110234391 A CN 201110234391A CN 102389742 A CN102389742 A CN 102389742A
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Abstract
The invention discloses high-precision dispensing equipment and a control method thereof. The high-precision dispensing equipment is provided with a feeding belt, a first metering hopper and a second metering hopper which are respectively arranged below two ends of the feeding belt, a first discharging belt arranged under the first metering hopper, and a second discharging belt arranged under the second metering hopper, wherein the feeding belt can rotate on the positive direction and the negative direction and used for feeding material in the other metering hopper when one metering hopper and the discharging belt thereof are used for blending the materials. Because the metering hoppers and the discharging belts are arranged below two ends of the feeding belt rotating in the positive direction and the negative direction, when one metering hopper at one end is used for feeding the materials, the discharging belt at the other end can be used for blending the materials, thus, higher metering accuracy and stability are obtained, continuity and uniformity of blending the materials can be ensured; meanwhile, the high-precision dispensing equipment has an online calibrating function, can find and correct errors under the condition of no halt, and has wide dosing measuring range and strong material and environment adapting capacity.
Description
Technical field
The present invention relates to weighing and dispensing equipment and distribution field thereof of pressed powder or particulate matter, in particular, what improvement related to is a kind of high accuracy dispensing equipment and control method thereof.
Background technology
At present, generally use four kinds of equipment in the industry of weighing and prepare burden of pressed powder or particulate matter: monobucket batch scale, electronic belt burden balance, helix balance and weightless scale.
The monobucket batch scale is to utilize sensor that weight signal is delivered in the middle of the instrument, and when weight reached setting value, gallery ports were closed, and stopped to feed in raw material, and opened the emptying door blowing then.Because simple in structure, the accuracy of monobucket batch scale is better with stability, environment dust and sizing can solve through peeling, and adaptive capacity to environment is also relatively good; But the monobucket batch scale is that interrupted proportioner can't be realized continuous blowing, often need to stir with other mixing of materials, and the bigger material of characteristic and proportional difference is difficult to stir at short notice, influences production efficiency.Its demarcation can only be carried out under the production halted state in addition.
The electronic belt burden balance are a kind of continous batching equipment; Its principle is that a weighing sensor and a velocity sensor are installed below belt, in the belt running, measures instantaneous weight and the stroke of synchronization belt or the speed of belt of material on certain section Belt Length; Through integral algorithm or accumulation algorithm; Draw mass flow and integrated flux; Because of the weight of material is that dragging roller through belt and below thereof passes to LOAD CELLS; The tension force of belt can present different nonlinear change with influences such as belt movement speed, belt deviation, cylinder sizing, belt sizing, feed bin pressure, environment temperature and machining accuracies, causes measuring accuracy and poor stability; Batching range narrow range, adaptive capacity to environment is poor, and measuring accuracy is about ± 1% in actual the use.And often need to demarcate to find and round-off error that the electronic belt burden balance are a kind of continous batching equipment in addition, in actual production process, can't stop midway and demarcate; Cause and in time to find in the production and round-off error, cause typical products in mass production defective easily.Therefore be mainly used in the less demanding place of proportioning accuracy.
The principle of helix balance is basic identical with the principle of electronic belt burden balance; Just belt is carried and made into helical feed; It needs weight sensor and velocity sensor to detect the weight and the revolution speed of screw of material in the spiral equally, through integral algorithm or accumulation algorithm, draws mass flow and integrated flux; But influenced by storehouse pressure, material properties variation, gap between screw flushing, the inner sizing of spiral, materials flow rent power etc.; Material flow V and spiral revolution N can not keep the constant ratio relation, thereby can produce obvious error in dipping, even sometimes can exceed instructions for use; Measuring accuracy is ± 2.About 0%.Batching range narrow range, adaptive capacity to environment is poor, because of helix balance also is a kind of continous batching equipment, in actual production process, also can't stops midway and demarcate, and causes product quality accident easily.
Weightless scale also is the decrement scale, generally by feed gate, and the hopper of weighing, drawing mechanism constitutes.The structure of weightless scale is actually improved on the basis of monobucket weigher; The essential distinction of itself and monobucket weigher is that the emptying door with the hopper below of weighing has been replaced with by motor-driven continuous drawing mechanism, can control motor rotation speed by controller and control blanking speed.Therefore it has the advantage of monobucket weigher: measuring accuracy and good stability, adaptive capacity to environment is strong.Its course of work principle is: feed gate is opened to the hopper of weighing reinforced; Charging closing gate after weight reaches setting value, drawing mechanism brings into operation, and material is released in the hopper of weighing; Metering device detects weight of material and minimizing speed in the hopper of weighing; Calculate material blanking flow, and regulate and adjust the materials device rotating speed, make the actual detected flow consistent with the setting flow with setting flow contrast carrying out PID.When weight in the hopper of weighing drops to less than lower limit; Feed gate is opened to the hopper of weighing reinforced once more, and carry out simultaneously because of charging and discharging in the hopper of weighing this moment, and controller can't accurately calculate actual load; Therefore also can't accurately control motor speed; This moment, system's batching was in blind area and runaway condition, and the compromise that existing weightless scale solves blind zone problem on the market is a drawing mechanism motor rotation frequency before the collection feed gate is opened, and with this fixed frequency control drawing mechanism motor speed; Reinforced overlong time finishes up to the reinforced process of the hopper of weighing, if can cause weightless scale to work long hours in the blind area; If in the blind area fracture and putty phenomenon take place, then equipment can't be discerned, and loses accuracy; And need corresponding making huge feed bin and weighing bucket when big and select the LOAD CELLS of wide range for use when the batching flow, be operated in the time of blind area with minimizing equipment, but can produce new problem like this; In actual production, need to fill a prescription and be changed to very low discharge hour by big flow; Because weighing bucket has been selected the wide range LOAD CELLS for use, it is not high enough that sensitivity can seem again, the accuracy when influencing the low discharge batching; Be difficult to adapt to wide-range batching needs; The hopper work of weighing in addition is in charging or discharging state all the time, in actual production process, also can't stop midway and demarcate, and causes the bulk article quality accident easily.
Therefore, prior art still haves much room for improvement and develops.
Summary of the invention
The objective of the invention is to, a kind of high accuracy dispensing equipment and control method thereof are provided, existing higher metering accuracy and stability can guarantee the continuity uniformity of preparing burden again.
Another object of the present invention is to have the on-line proving function, can under not shutdown situation, find and round-off error, and separate unit batching range wide ranges, material and adaptive capacity to environment are strong.
Technical scheme of the present invention is following: a kind of high accuracy dispensing equipment comprises reinforced belt, weighing hopper and outfeed belt; Wherein: said weighing hopper comprises first weighing hopper and second weighing hopper that is separately positioned on reinforced belt two ends; Said outfeed belt comprises first outfeed belt that is arranged under first weighing hopper and is arranged on second outfeed belt under second weighing hopper; Said reinforced belt is controlled can to rotate on positive and negative both direction, when being used for therein a weighing hopper and outfeed belt thereof and preparing burden, another weighing hopper is fed in raw material.
Described high accuracy dispensing equipment, wherein: on reinforced belt, be provided with and drive the reinforced motor that reinforced belt rotates; Band is set on first outfeed belt drives the first discharging motor that first outfeed belt rotates; On second outfeed belt, be provided with and drive the second discharging motor that second outfeed belt rotates; Reinforced motor, the first discharging motor and the second discharging motor are controlled by same controller control respectively.
Described high accuracy dispensing equipment, wherein: the first discharging motor and the second discharging motor pass through frequency converter and controller control connection separately respectively.
Described high accuracy dispensing equipment, wherein: on first weighing hopper and second weighing hopper, be respectively arranged with separately weight sensor, telescoping mechanism and counterweight; Weight sensor is used to support weighing hopper and outfeed belt separately; Telescoping mechanism is used to connect weighing hopper and counterweight thereof separately.
A kind of control method like above-mentioned high accuracy dispensing equipment wherein, may further comprise the steps: in the process of first weighing hopper through first outfeed belt batching, and reinforced belt counter-rotating, reinforced to second weighing hopper, and weigh; In with the process of second weighing hopper through second outfeed belt batching, reinforced belt just changes, and gives first weighing hopper reinforced, and weighs; The batching that hockets by turns and reinforced.
The control method of described high accuracy dispensing equipment, wherein: rotate to corresponding weighing hopper when reinforced at reinforced belt, stop reinforced belt and rotate through judging whether to arrive the reinforced time.
The control method of described high accuracy dispensing equipment, wherein: rotate to corresponding weighing hopper when reinforced at reinforced belt, whether reach the upper limit through the weight of judging the corresponding measurement bucket and stop reinforced belt rotation.
The control method of described high accuracy dispensing equipment; Wherein: flow and the error of after batching, calculating the corresponding measurement bucket; Start the speed of its outfeed belt rotation of Frequency Converter Control be connected with the discharging motor, and whether reach lower limit through the weight of judging the corresponding measurement bucket and stop its frequency converter.
The control method of described high accuracy dispensing equipment, wherein: in the running of frequency converter, comprise and adopt the PID controller to regulate cumulative errors.
The control method of described high accuracy dispensing equipment, wherein: the weight of a corresponding measurement bucket of record after reinforced belt stops operating; , writes down by frequency converter the weight of a corresponding measurement bucket after stopping again; Adjust the sum of errors cumulant of twice record.
A kind of high accuracy dispensing equipment provided by the present invention and control method thereof; But owing to below the reinforced belt two ends of rotating, be provided with weighing hopper and outfeed belt respectively; When reinforced belt gives the weighing hopper of an end wherein reinforced, utilize the outfeed belt of the other end to prepare burden, so by turns; Static weighing and dynamic batching are organically combined; Metering serves as the control basis with the weight that gets into and flow out the material of weighing hopper all the time, and do not receive that sizing, burn into belt deviation skid, belt tension variation etc. influences, and both guaranteed higher metering accuracy and stability; Guaranteed the continuity of batching again, had stronger environmental change and material and change adaptive capacity.Alternately carry out charging and batching by turns because of two weighing hoppers, under the prerequisite that guarantees the continuous non-blind area of blanking, when carry out big flow when preparing burden two weighing hoppers can realize miniaturization, economical with materials and installing space; Realize miniaturization because of weighing hopper simultaneously, but the selected range LOAD CELLS higher than sluggishness so just can adapt to the accuracy requirement that low discharge is filled a prescription, and can expand the batching range ability significantly; Two weighing hoppers alternately carry out charging and batching by turns, also for the realization of on-line proving function provides time and chance, when a side is being prepared burden; Opposite side can suspend before reinforced the completion or after reinforced the completion to be demarcated, and controller control telescoping mechanism is mentioned counterweight or put down, with weighing hopper weight reduction or recruitment and the contrast of demarcation counterweight weight; Find error and round-off error with this; Realize on-line proving, realize equipment fault diagnosis, guarantee product quality; The both sides batching that hockets in addition, when a side weighing hopper breaks down, the alternative partial function of opposite side weighing hopper is raced against time for maintenance fast, avoids unnecessary shutdown.
Description of drawings
Fig. 1 is the structure principle chart of automated high-precision dispensing equipment of the present invention.
Fig. 2 is the flow chart of high accuracy dispensing equipment automatic proportioning control method of the present invention.
The specific embodiment
Below will combine accompanying drawing, specific embodiments of the invention and embodiment specify, and described specific embodiment in order to explain the present invention, is not to be used to limit the specific embodiment of the present invention only.
A kind of high accuracy dispensing equipment of the present invention; As shown in Figure 1; What comprise splendid attire pressed powder or particulate matter adds feed bin 101, is provided with filler interface in the exit that adds feed bin 101, and reinforced belt 102 is set below filler interface; Rotate through reinforced motor 103 or the reinforced belt 102 of reinforced fluid motor-driven, and the weighing hopper of reinforced belt 102 belows is fed in raw material; Wherein, weighing hopper comprises first weighing hopper 104 and second weighing hopper 107, is separately positioned on the two ends of reinforced belt 102, can give first weighing hopper 104 reinforced when reinforced belt 102 is just changeing, and can give second weighing hopper 107 reinforced when feeding in raw material belt 102 counter-rotatings; Be provided with first outfeed belt 105 in first weighing hopper, 104 bottoms, can drive, also can pass through first fluid motor-driven, be used for batching through the first discharging motor 106; Simultaneously, be provided with second outfeed belt 108, can drive, also can pass through second fluid motor-driven, also be used for batching through the second discharging motor 109 in second weighing hopper, 107 bottoms; Said reinforced belt 102 controlled can on positive and negative both direction, rotations are used for therein a weighing hopper 104 (or 107) and outfeed belt 105 (or 108) thereof when preparing burden, and another weighing hopper 107 (or 104) is fed in raw material; And after reinforced, this weighing hopper 107 (or 104) is weighed.
Based on above-mentioned high accuracy dispensing equipment; The invention allows for a kind of Charge Mixture Control method; As illustrated in fig. 1 and 2, comprise at least: when preparing burden (being A side batching) through first outfeed belt 105 with first weighing hopper 104, reinforced belt 102 counter-rotatings; Give second weighing hopper 107 reinforced, and weigh (promptly writing down the B amount of stressing); When preparing burden (being B side batching) with second weighing hopper 107 through second outfeed belt 108, reinforced belt 102 is just changeing, and gives first weighing hopper 104 reinforced, and weigh (promptly writing down the A amount of stressing); The batching that hockets so by turns and reinforced.
In the preferred implementation of high accuracy dispensing equipment of the present invention and control method thereof, as shown in Figure 1, rotating with the motor-driven belt is example, reinforced motor 103, the first discharging motor 106 and the second discharging motor 109 all with same controller 117 control connections; Driving reinforced belt 102 at reinforced motor 103 is just changeing (or counter-rotating) and is rotating when giving corresponding weighing hopper (for example second weighing hopper 107) reinforced, through judging whether to arrive the rotation that the predetermined reinforced time stops reinforced belt 102; And/or drive reinforced belt 102 at reinforced motor 103 and just changeing (or counter-rotating) and rotate when giving corresponding weighing hopper (for example second weighing hopper 107) reinforced, the upper limit that whether reaches setting through the weight of judging corresponding measurement bucket (for example second weighing hopper 107) stops reinforced belt 102 rotations.To avoid taking place the phenomenon of fracture and putty, eliminate volume batching blind area.
Be preferably, the first discharging motor 106 is connected with controller 117 through independent frequency converter 115; The second discharging motor 109 also is connected with same controller 117 through independent frequency converter 116; Be used for after batching, calculating the flow and the error of corresponding measurement bucket; Start the speed that the connected discharging motor-driven of corresponding Frequency Converter Control outfeed belt rotates, and stop its frequency converter through the lower limit whether weight of judging the corresponding measurement bucket reaches setting.To adapt to the variation significantly of prescription, enlarge separate unit batching scope.
In the running of corresponding frequency converter, also comprise and adopt PID (proportional-integral-differential) controller to regulate cumulative errors, with the cumulative errors that reduce to prepare burden.So-called PID controller is made up of ratio unit P, integral unit I and differentiation element D, and through Kp, the setting of Ki and three parameters of Kd is used for substantially linear and dynamic characteristic time invariant system; In the industrial processes, usually require to maintain on certain numerical value, or change according to certain rules, to satisfy the requirement of production technology for state-variables such as the temperature of process units, pressure, flow, liquid levels.The PID controller is according to the PID control principle The whole control system to be carried out bias adjustment, thereby makes the predetermined value of actual value and technological requirement of controlled variable consistent.
Concrete, as shown in Figure 1, on first weighing hopper 104 and second weighing hopper 107, be respectively arranged with separately weight sensor 110, telescoping mechanism 111 and 113 and counterweight 112 and 114; Weight sensor 110 is used for respectively separately weighing hopper 104 (with 107) and outfeed belt 105 (or 108) being supported, and passes to same controller 117 to weight signal through wired or wireless mode; Telescoping mechanism 111 (with 113) is used for being connected respectively weighing hopper 104 (with 107) and counterweight 112 (with 114) thereof separately.
After reinforced belt stops operating, write down the weight of a corresponding measurement bucket, after frequency converter stops, writing down the weight of a corresponding measurement bucket again, adjust the sum of errors cumulant of twice record then; Through the PID controller The whole control system is carried out bias adjustment, thereby make the predetermined value of actual value and technological requirement of controlled variable consistent.
Compare with dispensing equipment of the prior art and control method thereof; A kind of high accuracy dispensing equipment provided by the present invention and control method thereof, but owing to below the reinforced belt two ends of rotating, be provided with weighing hopper and outfeed belt respectively, when reinforced belt gives the weighing hopper of an end wherein reinforced; Utilize the outfeed belt of the other end to prepare burden; So by turns, static weighing and dynamic batching are organically combined, metering serves as to control basis with the weight that gets into and flow out the material of weighing hopper all the time; Do not receive that sizing, burn into belt deviation skid, belt tension variation etc. influences; Both guaranteed higher metering accuracy and stability, guaranteed the continuity of batching again, and had stronger environmental change and material and change adaptive capacity.Alternately carry out charging and batching by turns because of two weighing hoppers, under the prerequisite that guarantees the continuous non-blind area of blanking, when carry out big flow when preparing burden two weighing hoppers can realize miniaturization, economical with materials and installing space; Realize miniaturization because of weighing hopper simultaneously, but the selected range LOAD CELLS higher than sluggishness so just can adapt to the accuracy requirement that low discharge is filled a prescription, and can expand the batching range ability significantly; Two weighing hoppers alternately carry out charging and batching by turns, also for the realization of on-line proving function provides time and chance, when a side is being prepared burden; Opposite side can suspend before reinforced the completion or after reinforced the completion to be demarcated, and controller control telescoping mechanism is mentioned counterweight or put down, with weighing hopper weight reduction or recruitment and the contrast of demarcation counterweight weight; Find error and round-off error with this; Realize on-line proving, realize equipment fault diagnosis, guarantee product quality; The both sides batching that hockets in addition, when a side weighing hopper breaks down, the alternative partial function of opposite side weighing hopper is raced against time for maintenance fast, avoids unnecessary shutdown.
Because high accuracy dispensing equipment of the present invention has organically combined static weighing and dynamic batching, has realized higher measuring accuracy and proportioning accuracy, so claim quiet moving scale again; As shown in the table, for the quiet moving scale of the present invention and four kinds of dispensing equipments of the prior art at the comparative result aspect each problem:
| Problem equipment | The monobucket weigher | Belted electronic balance | Helix balance | Weightless scale | Quiet moving scale |
| Belt tension changes to be influenced precision | Do not influence | Influence | Do not influence | Do not influence | Do not influence |
| Belt (spiral) sizing influences precision | Do not influence | Influence | Influence | Do not influence | Do not influence |
| Measuring accuracy | ±0.25% | ±1% | ±2% | ±0.5% | ±0.25% |
| Long-time stability | Good | Difference | Difference | Good | Good |
| Material characteristic changes adaptability | Good | Good | Difference | Difference | Good |
| Environmental change adaptability | Good | Difference | Difference | Good | Good |
| Separate unit batching range ability | 1-10 doubly | 3-5 doubly | 3-5 doubly | 1-10 doubly | 1-50 doubly |
| On-line proving | Do not have | Do not have | Do not have | Do not have | Have |
| The batching continuity | Intermittently | Continuously | Continuously | There is reinforced blind area | Continuously |
There is last table to know; Quiet moving scale great advantage of the present invention is that existing higher metering accuracy and stability can guarantee the continuity uniformity of preparing burden again; Has the on-line proving function simultaneously; Can under not shutdown situation, find and round-off error, separate unit batching range wide ranges, material and adaptive capacity to environment are strong.
Should be understood that; The above is merely preferred embodiment of the present invention, is not sufficient to limit technical scheme of the present invention, concerning those of ordinary skills; Within spirit of the present invention and principle; Can increase and decrease according to above-mentioned explanation, replacement, conversion or improvement, for example: outfeed belt 105 can be replaced by the spiral way blanking with outfeed belt 108, the mode that two reinforced belts 103 can be used two gates or two feeding machines instead; To give A side and B side weighing hopper reinforced respectively; Telescoping mechanism 111 and 113 can be cylinder, oil cylinder, electric pushrod, Motorized lift device etc., and all these increases and decreases, replacement, conversion or improve after technical scheme, all should belong to the protection domain of accompanying claims of the present invention.
Claims (10)
1. a high accuracy dispensing equipment comprises reinforced belt, weighing hopper and outfeed belt; It is characterized in that: said weighing hopper comprises first weighing hopper and second weighing hopper that is separately positioned on below, reinforced belt two ends; Said outfeed belt comprises first outfeed belt that is arranged under first weighing hopper and is arranged on second outfeed belt under second weighing hopper; Said reinforced belt is controlled can to rotate on positive and negative both direction, when being used for therein a weighing hopper and outfeed belt thereof and preparing burden, another weighing hopper is fed in raw material.
2. high accuracy dispensing equipment according to claim 1 is characterized in that: on reinforced belt, be provided with and drive the reinforced motor that reinforced belt rotates; Band is set on first outfeed belt drives the first discharging motor that first outfeed belt rotates; On second outfeed belt, be provided with and drive the second discharging motor that second outfeed belt rotates; Reinforced motor, the first discharging motor and the second discharging motor are controlled by same controller control respectively.
3. high accuracy dispensing equipment according to claim 2 is characterized in that: the first discharging motor and the second discharging motor pass through frequency converter and controller control connection separately respectively.
4. high accuracy dispensing equipment according to claim 1 is characterized in that: on first weighing hopper and second weighing hopper, be respectively arranged with separately weight sensor, telescoping mechanism and counterweight; Weight sensor is used to support weighing hopper and outfeed belt separately; Telescoping mechanism is used to connect weighing hopper and counterweight thereof separately.
5. the control method of high accuracy dispensing equipment according to claim 1 is characterized in that, may further comprise the steps: with first weighing hopper during through first outfeed belt batching, reinforced belt counter-rotating is given second weighing hopper reinforced, and is weighed; When preparing burden through second outfeed belt with second weighing hopper, reinforced belt just changes, and gives first weighing hopper reinforced, and weighs; The batching that hockets by turns and reinforced.
6. the control method of high accuracy dispensing equipment according to claim 5 is characterized in that: rotate to corresponding weighing hopper when reinforced at reinforced belt, stop reinforced belt and rotate through judging whether to arrive the reinforced time.
7. the control method of high accuracy dispensing equipment according to claim 5 is characterized in that: rotate to corresponding weighing hopper when reinforced at reinforced belt, whether reach the upper limit through the weight of judging the corresponding measurement bucket and stop reinforced belt rotation.
8. the control method of high accuracy dispensing equipment according to claim 5; It is characterized in that: flow and the error of after batching, calculating the corresponding measurement bucket; Start the speed of its outfeed belt rotation of Frequency Converter Control be connected with the discharging motor, and whether reach lower limit through the weight of judging the corresponding measurement bucket and stop its frequency converter.
9. the control method of high accuracy dispensing equipment according to claim 8 is characterized in that: in the running of frequency converter, comprise and adopt the PID controller to regulate cumulative errors.
10. the control method of high accuracy dispensing equipment according to claim 8 is characterized in that: the weight of a corresponding measurement bucket of record after reinforced belt stops operating; , writes down by frequency converter the weight of a corresponding measurement bucket after stopping again; Adjust the sum of errors cumulant of twice record.
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Effective date of registration: 20160722 Address after: 518103, Guangdong, Baoan District, Fuyong province Shenzhen street, Ocean Development Zone, Fu'an industrial city, phase 5, building two, 303 Patentee after: Shenzhen Shen Bo Automation Co., Ltd Address before: 1, building 1, 518000 floor, blue sky science and Technology Industrial Zone, Heping Street, Heping Street, Fuyong, Guangdong, Shenzhen, Baoan District Patentee before: Duan Aiqin |
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