CN100371840C - On-line weighing dispensing method based on feed speed control - Google Patents
On-line weighing dispensing method based on feed speed control Download PDFInfo
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Abstract
The present invention relates to an on-line weighing and compounding method based on feed speed control, which realizes a stepless speed regulation compounding method of automatic control for on-site production. The present invention can carry out high-precision weighing to relevant complicated materials with various physical properties and improve the production technology control. The on-line weighing and compounding method determines the feeding rate V by determining the speed dropping index alpha and the primary feeding rate V0, and determines the material accumulation amount W by combining the speed transformation point time t. The content can basically realize the known weighed material Wall. The weighing time T of a feeding device can be controlled by setting and controlling the variation of the feeding rate V. Consequently, the present invention can farthest ensure that the actual measured material weight W is closed to the value of the known weighing material Wall.
Description
Technical Field
The invention relates to an on-line weighing and proportioning method in a production field, in particular to a method for realizing high-precision weighing and proportioning based on the speed control of feeding equipment.
Background
At present, in the production and manufacturing processes of the industries such as rubber and plastic industry, money printing and ink printing, medicine preparation and the like, the process flow of material preparation and raw material preparation needs to be carried out according to a fixed formula. The weighing process is a proportioning process of automatic feeding and discharging and mixing of various raw materials. In the links of process control and product quality improvement, the realization of accurate proportioning of raw materials is a key factor influencing and determining the quality of the product.
In the existing raw material formula, besides the large amount of the main materials, a plurality of auxiliary materials are often added, the content of the auxiliary materials is small, and the proportioning precision requirement is high. At present, aiming at the process control for improving the batching precision of a production field, manual batching is generally adopted or the process control is realized through constant-speed feeding equipment, so that the defects and the limitations of controlling the proportioning precision and the batching efficiency are obvious.
1. If the materials are various and the characteristics, the colors and the shapes are similar, the batching operators are easy to make mistakes if the spirits are not concentrated, thereby seriously affecting the quality of the materials and the production safety;
2. because of the objective existence of the material adhesion, the feeding speed of different materials is changed due to different material adhesion in the same environment and under the condition of the same feeding device, so that the debugging is difficult, and the weighing precision is difficult to control.
3. Due to the factor of material density, even if the same weighing device and the same control mode are adopted, the feeding speed is different due to different material densities. The existing feeding equipment and control process cannot solve the problem.
4. The existing feeding device belongs to a nonlinear operation for controlling the feeding device, and even under the control of the same control method and variable, the vibration force and the speed of the feeding device are different, so that the influence and the restriction on the dosing precision are large.
As described above, manual batching or a control mode based on the existing feeding device is difficult to achieve on-site random adjustment and control due to poor adaptability to human factors or material characteristics and environmental changes, and cannot ensure weighing precision, low production efficiency and long weighing time for different states, batches and quality changes of different materials or the same material. Therefore, the online weighing is realized by aiming at the speed control of the feeding equipment, and the method is a key and main way for solving the problems of material mixing speed and precision and realizing the continuous production of a plurality of batches and a plurality of varieties of materials.
Disclosure of Invention
The invention discloses an on-line weighing and batching method based on feeding speed control, which aims to solve the problems and the defects to realize a stepless speed regulation batching method for field production automatic control, can solve the high-precision weighing of various related materials with complicated physical properties and improve the production process control.
The core content of the on-line weighing and batching method based on feeding speed control is to establish a corresponding function relationship between the weight of the material to be weighed and the operation speed of the feeding control equipment, namely to obtain a coefficient for establishing and controlling the corresponding variables, and to realize the accumulation process of accurately controlling the feeding weight by on-line and dynamic control of the operation speed of the feeding equipment, thereby realizing the minimization of the error between the weighed weight and the actual weighed weight to the maximum extent.
The on-line weighing and batching method of the invention is applied, a batching controller is configured on the feeding device to realize the setting and control of the feeding speed, and the running speed of the feeding device, namely the amplitude of vibration or the spiral frequency, is controlled by a negative feedback method through the material weight actually measured by the weighing device. Under the control of the on-line weighing and batching method, the weight accuracy of the weighed material is realized based on the control of the feeding speed, namely the control of the running speed of the feeding equipment.
By applying the on-line weighing and proportioning method, after the feeding device is installed in place, the self characteristics of the feeding device are consistent, namely, the running speed of the feeding device can be adjusted and controlled in real time no matter what form of (powdery or granular) material is weighed or the physical characteristics of the material are measured. Based on the control of the feeding speed, the actually measured feeding speed can reflect the weight change of the weighed material in a numerical value form, is not influenced by time, place and operators, and has more reliable consistency.
The invention relates to an on-line weighing and batching method, which sets a weighed material W all The initial feeding speed of the feeding device is V 0 The key is to establish and determine W all And V 0 The corresponding coefficients between and the intermediate control variables.
The on-line weighing and batching method establishes and determines W all And V 0 The corresponding coefficient and the intermediate control variable between the above can be selected from any one of the feeding devices and the proportioning controllers thereof, and are calculated and derived through the following steps:
first, a material W to be weighed is established all The feeding speed V and the weighing time T, namely:
①
V＝W′＝aW all e -at (2) where α is the feed rate reduction index.
Then, the material W is weighed according to the above all Determining the feed rate V and the weighing timeThe functional relationship of T. Namely: v = V 0 e -at ③
When t =0, the feed rate V may be large, which is not consistent with actual field production conditions. In practice, the feeding speed in the initial stage should be increased from 0 to the set value V 0 (ii) a When the weight of the material to be weighed reaches a certain amount W L Thereafter, the feed rate V starts to decrease.
Thus, the actual feed rate V can be set in stages:
wherein, W L Is the cumulative amount of material at the speed transition point.
In the above method context, the initial feed rate V 0 The speed reduction index alpha and the time t of the speed transition point when the cumulative amount of the material is reached are used for determining the weight W of the material to be weighed all At an initial feed rate of V 0 Intermediate control variables of the corresponding function therebetween.
The initial feeding speed V 0 With the weight W to be weighed all Approximately linear, i.e. weighed W all Velocity V 0 The linear function of (a) is:
V 0 ＝kW all +b⑤
where k is a scaling factor and b is the minimum initial velocity value. Through weighing tests and actual measurements on a plurality of materials, the coefficient k is a known set value, and the minimum initial feeding speed b is determined by the characteristics of the feeding device and is a known or measurable value.
Thus, the weight W can be set based on the determined coefficients all To directly derive the initial velocity V 0 The numerical value of (c).
The speed reduction index alpha is generally in the range of 0.1-0.7. Velocity reduction index alpha and initial feed velocity V 0 Is a linear relationship, namely:
a＝nV 0 +m⑥
wherein n is alpha and V 0 M is the minimum value of alpha.
The coefficient n is a known set value by weighing tests and actual measurements for a variety of materials. And the minimum value m of the speed reduction index is a set value.
Therefore, the initial velocity V can be set based on the determination of the corresponding coefficients 0 The value of the speed reduction index alpha is directly derived.
The time t of the speed transition point is set as the feeding speed V 0 The accumulation of the materials is W when W is more than or equal to W L When the feeding speed V should start to decrease, the feeding speed is started to decrease from the initial feeding speed V 0 And the speed V, the value of the speed transition point time t can be directly derived, namely the following expression formula is introduced:
V＝V 0 e -at ③
as mentioned above, the on-line weighing and batching method of the invention is realized by determining the speed reduction index alpha and the initial feeding speed V 0 To determine the feed velocity V and, in conjunction with the velocity transition point time t, to determine the material accumulation W, by means of which a known material W to be weighed can be substantially achieved all Setting and controlling the change of the feeding speed V to control the weighing time T of the feeding device, thereby maximally ensuring that the measured material weight W is close to the known weighed material W all The value of (c).
In order to improve the accuracy of controlling the feed weight, the above-mentioned initial control amount u is further controlled 0 And a predicted closing value of the next blanking amount delta W. In particular, the amount of the solvent to be used,
the feeding speed in the initial stage is increased from 0 to the set value V 0 For this purpose, it is necessary to determine the initial control amount u 0 . Initial control quantity u 0 The feeding device is controlled to reach the set feeding speed V in the shortest time 0 The variable values of (a) are:
is weighed by weight W all And an initial control amount u 0 A linear relationship is established, and the weight W can be weighed based on the corresponding coefficient of the two all Directly deducing initial control quantity u 0 The numerical value of (c). Namely:
u 0 ＝xW all +y⑦
wherein x is u 0 And W all Y is u 0 Is measured.
Through weighing tests and actual measurement aiming at various materials, the coefficient x is a known set value, and the initial control quantity minimum value y is a set known value.
In addition, when the weight of the weighed material reaches W L Thereafter, the feed rate V starts to decrease and approaches 0, but when the feed rate V is set to 0, i.e. the operation of the feeding device is stopped, a pre-close door value is also determined.
The pre-closing value is the predicted next blanking amount delta W, the predicted next weight is given by a backward difference method, and the added value of the weighed material can be estimated according to the feeding speed V and the sampling time delta T, so that accurate batching is achieved and the requirement of W is met all D is the minimum of the feeding deviceScale units) of material weight within the range. Namely:
ΔW(k)＝V(k)ΔT⑧
the above contents are the main contents of the on-line weighing and proportioning method based on the feeding speed control. By establishing a weighed weight W as described all The corresponding function relation of the feeding speed V and the weighing time T, and the initial value of each coefficient determined according to the accumulation of the actual field production condition, namely determining the initial feeding speed V 0 Initial control amount u 0 The initial value of the speed reduction index a, the value of the speed transition point, etc., the weight W to be weighed all Is controlled at W all Within + -3 d, thereby realizing on-line weighing and proportioning based on the control of the feeding speed.
In summary, the method for weighing and proportioning materials on line based on feeding speed control has the following advantages and beneficial effects:
1. in the material proportioning process, manual operation is completely avoided, so that the influence of human factors is avoided;
2. the on-line weighing and batching method based on feeding speed control is not influenced by material adhesion, realizes the adjustment and control of feeding speed aiming at different materials and weights under the condition of the same environment and the same feeding device, and is easy to realize and control the weighing precision;
3. the on-line weighing and batching method can determine the weighed weight W according to different materials or material characteristics all The coefficient of a corresponding function between the feeding speed V and the weighing time T has stronger universality, and no special requirements are provided for the feeding device and equipment conditions.
Drawings
FIG. 1 is a schematic block diagram of the feed rate control using the on-line weigh batching method;
FIG. 2 is a graph of the feed rate as a function of time;
fig. 3 is a graph of the set speed function.
Detailed Description
Example 1, as shown in fig. 1, the method for weighing and batching materials on line based on feeding speed control is applied, a batching controller is configured on a feeding device to realize the setting and measurement of the feeding speed control, and the running speed or the vibration frequency of the feeding device is reversely controlled through the material weight actually measured by the weighing device.
Under the control of the on-line weighing and batching method, the weight precision of the weighed materials is realized based on the control of the feeding speed, namely the control of the running speed of the feeding equipment.
As shown in fig. 1 to 3, the online weighing and batching method is as follows:
first, establishing a material W to be weighed all Feeding speed V and weighing time T. That is, after the feeding device and the control device thereof are installed in place, any material to be weighed is selected, and the weighing weight is set to W all 。
According to the set weight W of the weighed material all To determine the initial feeding speed V 0 ；
And establishing a corresponding function relation between the actually measured material weight W and the feeding speed V and the weighing time T, namely
①
V＝W′＝aW all e -at ②
Where α is the feed rate reduction index.
Second, weighing the material W all The feeding speed V as a function of the weighing time T, is very high when T =0, which is not consistent with actual field production.
In practice, the initial feeding speed should be increased from 0 to the set value V 0 ；
When the weight of the material to be weighed reaches a certain value W L After that, the feed rate V starts to decrease, then:
V＝V 0 e -at ③
thus, the actual feed velocity V can be set in stages:
W L is the cumulative amount of material at the speed transition point
Thirdly, determining the initial feeding speed V 0 。
Weighing the weight W according to actual production experience all Velocity V 0 Approximately linear. Thus, the weight W can be set based on the corresponding coefficient of the two all To directly derive the initial velocity V 0 The numerical value of (c).
Is weighed by weight W all Velocity V 0 The linear function of (a) is:
V 0 ＝kW all +b⑤
where k is a scaling factor and b is the minimum initial velocity value. The coefficient k is a known set value by weighing tests and actual measurements for a variety of materials. The minimum initial feeding speed b is determined by the characteristics of the feeding device, and is a known or measurable value.
And fourthly, determining the speed reduction index alpha.
The speed reduction index a is generally in the range of 0.1-0.7 according to the accumulation of actual field production conditions.
Initial feed velocity V 0 A linear relation is established with the speed reduction index alpha, and the initial speed V can be set on the basis of determining the corresponding coefficients of the two 0 The value of the speed reduction index alpha is directly derived. Namely:
a＝nV 0 +m⑥
wherein n is alpha and V 0 M is the minimum value of α.
The coefficient n is a known set value through weighing tests and actual measurements for a variety of materials. And the minimum value m of the speed reduction index is a settable value.
And fifthly, determining the value of the speed transition point time t.
According to the accumulation of actual field production conditions, setting the feeding speed at V 0 The accumulation of the materials is W when W is more than or equal to W L When the feeding speed V should start to decrease, the initial feeding speed V is used 0 And the speed V, the value of the speed transition point time t can be directly deduced, namely the following expression formula is quoted:
V＝V 0 e -at ③
the contents of the method from the first step to the fifth step described above, i.e. by determining the velocity reduction index α, the initial feed velocity V 0 To determine the feed speed V and, in conjunction with the speed transition point time t, to determine the material accumulation W, by means of which a known material W to be weighed can be substantially achieved all Setting and controlling the change of the feeding speed V to control the weighing time T of the feeding device, thereby maximally ensuring that the measured material weight W is close to the known weighed material W all The value of (c).
Sixthly, determining an initial control quantity u 0 。
Is weighed by weight W all With the initial control quantity u 0 A linear relationship is established, and the weight W can be weighed based on the corresponding coefficient of the two all Directly deducing initial control quantity u 0 The numerical value of (c). Namely:
u 0 ＝xW all +y⑦
wherein x is u 0 And W all Y is u 0 Is measured.
Through weighing tests and actual measurement aiming at various materials, the coefficient x is a known set value, and the initial control quantity minimum value y is a set known value.
And seventhly, determining a pre-closing value.
The pre-closing value is the predicted blanking amount delta W of the next step, the predicted weight of the next step is given by a backward difference method, and the added value of the weighed material can be estimated according to the feeding speed V and the sampling time delta T, so that accurate batching is achieved and the requirement on W is met all Weight of material within + -3 d. Namely:
ΔW(k)＝V(k)ΔT⑧
the above contents are the basic contents of the on-line weighing and proportioning method based on the feeding speed control.
Claims (4)
1. The on-line weighing and batching method based on the feeding speed control is characterized in that: set the weighed weight as W all The initial feeding speed of the feeding device is V 0 The method is carried out by establishing a weighed weight W all The corresponding functional relationship of the feed speed V and the weighing time T, i.e.
The weighing time T of the feeding device is controlled by determining the speed transition point time T and adjusting and controlling the change of the feeding speed V, so as to realize the dynamic control of the material accumulation amount W,
in the method, the weight W is weighed according to the measured weight all Determining the corresponding functional relationship between the feeding speed V and the weighing time T, namely: v = V 0 e -at ；
When t =0, the feeding speed is controlled to rise to the set value V quickly 0 When the weight of the material to be weighed reaches a certain amount W L Then, the feed rate V starts to decrease, W L The material accumulation amount at the speed transition point;
in the method, a speed reduction index alpha and an initial feeding speed V are established 0 Corresponding linear proportional relationship between, i.e. a = nV 0 +m，
Wherein n is alpha and V 0 M is the minimum value of alpha; the coefficient n is a known set value and the minimum value m of the speed reduction index is a set value.
2. The on-line weighing and proportioning method based on feed rate control of claim 1, wherein: in which method an initial feed velocity V is established 0 With the weight W to be weighed all Corresponding to a linear proportional relationship, i.e. V 0 ＝kW all +b，
Wherein k is a proportionality coefficient, and b is a minimum initial velocity value; the coefficient k is a known set value and the minimum initial velocity b of the feed is a known or measurable value.
3. The on-line weighing ingredient method based on feed rate control according to claim 1 or 2, characterized in that: set and control the feeding device to reach the set feeding speed V in the shortest time 0 Initial control amount u of variable value of 0 In which method a weighed weight W is established all With the initial control quantity u 0 Corresponding linear proportionality relationship between, i.e. u 0 ＝xW all +y；
Wherein x is u 0 And W all Y is u 0 The minimum value of (d); the coefficient x is a known set value, and the initial controlled variable minimum value y is a set known value.
4. The on-line weighing ingredient method based on feed rate control according to claim 1 or 2, characterized in that: setting a pre-closing value of the predicted next blanking amount delta W, and realizing the predicted pre-closing value according to the feeding speed V and the sampling time delta T, namely
Δ W (k) = V (k) Δ T, where k is a scaling coefficient and the coefficient k is a known set value.
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Cited By (1)
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| CN109959436A (en) * | 2017-12-14 | 2019-07-02 | 湖南中联重科混凝土机械站类设备有限公司 | Control method, device and the material weighing system of material weighing |
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| CN102556629B (en) * | 2010-12-08 | 2016-01-20 | 浙江霸王衡器有限公司 | Intelligent automatic dosing control system |
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| US11590057B2 (en) | 2020-04-03 | 2023-02-28 | Icu Medical, Inc. | Systems, methods, and components for transferring medical fluids |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109959436A (en) * | 2017-12-14 | 2019-07-02 | 湖南中联重科混凝土机械站类设备有限公司 | Control method, device and the material weighing system of material weighing |
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Address after: 266045 No. 1, Zhengzhou Road, Qingdao, Shandong Patentee after: MESNAC Co.,Ltd. Address before: 266045 No. 1, Zhengzhou Road, Qingdao, Shandong Patentee before: Qingdao Mesnac Co.,Ltd. |
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| CX01 | Expiry of patent term |
Granted publication date: 20080227 |