CN114393701A - Dry-mixed mortar finished product bin and control method, control device and controller thereof - Google Patents
Dry-mixed mortar finished product bin and control method, control device and controller thereof Download PDFInfo
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- CN114393701A CN114393701A CN202111567251.4A CN202111567251A CN114393701A CN 114393701 A CN114393701 A CN 114393701A CN 202111567251 A CN202111567251 A CN 202111567251A CN 114393701 A CN114393701 A CN 114393701A
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- 239000004570 mortar (masonry) Substances 0.000 title claims abstract description 109
- 238000000034 method Methods 0.000 title claims abstract description 48
- 239000000463 material Substances 0.000 claims abstract description 110
- 238000006243 chemical reaction Methods 0.000 claims abstract description 36
- 238000007599 discharging Methods 0.000 claims description 27
- 238000012937 correction Methods 0.000 claims description 5
- 239000000126 substance Substances 0.000 claims description 3
- 238000010276 construction Methods 0.000 abstract description 6
- 230000008569 process Effects 0.000 description 13
- 238000010586 diagram Methods 0.000 description 10
- 238000003860 storage Methods 0.000 description 8
- 238000004590 computer program Methods 0.000 description 7
- 230000006870 function Effects 0.000 description 7
- 238000004364 calculation method Methods 0.000 description 5
- 210000001503 joint Anatomy 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 238000005303 weighing Methods 0.000 description 4
- 239000000109 continuous material Substances 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 238000007580 dry-mixing Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 206010039203 Road traffic accident Diseases 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 235000013339 cereals Nutrition 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 235000013312 flour Nutrition 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
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- 238000004519 manufacturing process Methods 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28C5/00—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions
- B28C5/003—Methods for mixing
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Abstract
The embodiment of the invention provides a dry-mixed mortar finished product bin, a control method, a control device and a controller thereof, wherein the control method for the dry-mixed mortar finished product bin comprises the following steps: acquiring a flow conversion value of a discharge screw of a dry-mixed mortar finished product bin and a target discharge quality of the dry-mixed mortar finished product bin; determining a first predicted total unloading time according to the flow conversion value and the target unloading quality; acquiring the radius of a dry-mixed mortar finished product bin and the material bulk density of the dry-mixed mortar finished product bin; obtaining an initial material level and a final material level of a dry-mixed mortar finished product bin within the current calibration unloading time; determining a second predicted total unloading time length according to the radius, the material bulk density, the initial material level, the final material level and the target unloading quality; and controlling the total unloading time length according to the first predicted total unloading time length and the second predicted total unloading time length. The embodiment of the invention can save the purchase and civil engineering construction cost of the weighbridge system, can automatically carry out accurate unloading start/stop control on the target unloading quality by one-key operation, and saves the occupied area and the equipment cost.
Description
Technical Field
The invention relates to the technical field of dry-mixed mortar finished product bin control, in particular to a dry-mixed mortar finished product bin, a control method, a control device and a controller thereof.
Background
In the dry-mixed mortar station, the finished mortar stirred by the mixer is stored in a finished product bin. When the finished mortar needs to be discharged, the finished mortar is loaded on a transport vehicle from a finished product bin through a finished product discharge screw by a bulk machine. As the overload of the transport vehicle easily causes the failure of a vehicle braking system to cause major traffic accidents, the wagon balance weight is mostly arranged below a finished product bin at present to avoid the overload of the vehicle. The wagon balance is installed below the discharge opening of the finished product bin, after the transport vehicle drives into the wagon balance below, the loading capacity is determined under the condition that the transport vehicle is not overloaded, the weight of the transport vehicle is observed in real time according to a wagon balance weighing instrument, and when the local wagon balance value reaches the loading value, the finished product bin is stopped to discharge materials and discharge materials spirally through manual work or butt joint of a wagon balance weighing system and a dry mixing control system. Therefore, the prior finished product bin unloading control method has the problems of high wagon balance cost, large civil construction amount, difficult construction, complex butt joint of a wagon balance system and a dry mixing control system and high wagon balance installation, maintenance and repair cost, so that the safe, efficient and economic finished product bin unloading control method is imperative. Therefore, it is urgently needed to provide a technical solution to solve the above technical problems in the prior art.
Disclosure of Invention
The embodiment of the invention aims to provide a dry-mixed mortar finished product bin, a control method, a control device and a controller thereof, and solves the technical problems that the existing finished product bin unloading control method is high in consumption, difficult to construct and maintain, needs civil engineering construction and complex in butt joint with a control system.
In order to achieve the above object, a first aspect of the present invention provides a control method for a dry-mixed mortar finished product bin, comprising: acquiring a flow conversion value of a discharge screw of a dry-mixed mortar finished product bin and a target discharge quality of the dry-mixed mortar finished product bin; determining a first predicted total unloading time according to the flow conversion value and the target unloading quality; acquiring the radius of a dry-mixed mortar finished product bin and the material bulk density of the dry-mixed mortar finished product bin; obtaining an initial material level and a final material level of a dry-mixed mortar finished product bin within the current calibration unloading time; determining a second predicted total unloading time length according to the radius, the material bulk density, the initial material level, the final material level and the target unloading quality; and controlling the total unloading time of the dry-mixed mortar finished product bin according to the first predicted total unloading time and the second predicted total unloading time.
In the embodiment of the invention, the obtaining of the flow conversion value of the discharge screw of the dry-mixed mortar finished product bin comprises the following steps: acquiring the material bulk density of a dry-mixed mortar finished product bin and the material filling coefficient of the dry-mixed mortar finished product bin; determining a flow conversion value according to the material bulk density and the material filling coefficient; wherein the flow conversion value is defined as: q1 ═ 47D2nt ρ Ψ C; wherein Q1 is a flow conversion value, D is a blade diameter of the discharge screw, n is a shaft rotation speed of the discharge screw, t is a blade pitch of the discharge screw, ρ is a material bulk density, Ψ is a material filling coefficient, and C is an inclination correction coefficient of the discharge screw.
In the embodiment of the present invention, the first predicted total unloading time is defined as: t1 ═ M/Q1; wherein T1 is the first predicted total discharge time, M is the target discharge quality, and Q1 is the flow conversion value.
In an embodiment of the present invention, determining the second predicted total discharge time according to the radius, the bulk density of the material, the initial material level, the final material level and the target discharge quality comprises: determining the discharge volume of the dry-mixed mortar finished product bin within the current calibration discharge time according to the radius, the initial material level and the final material level; determining the actual flow of the discharging screw in the current calibration discharging time length according to the discharging volume and the material bulk density; and determining a second predicted total unloading time according to the actual flow and the target unloading quality.
In the embodiment of the present invention, the second predicted total unloading time period is defined as: t2 ═ M/Q2; wherein T2 is the second predicted total unloading time, M is the target unloading quality, and Q2 is the actual flow; wherein, Q2 is rho V/T0, rho is the bulk density of the material, V is the discharge volume, and T0 is the calibrated discharge duration; wherein the content of the first and second substances,
v is the discharge volume, f (x) is the radius, x is the material level of the dry-mixed mortar finished product bin, a is the initial material level, and b is the final material level.
In the embodiment of the invention, the step of controlling the total unloading time of the dry-mixed mortar finished product bin according to the first predicted total unloading time and the second predicted total unloading time comprises the following steps: determining whether the sum of the current unloading time length and the calibrated unloading time length of the dry-mixed mortar finished product bin reaches a first predicted total unloading time length; under the condition that the sum of the current unloading time length and the calibrated unloading time length reaches a first predicted total unloading time length, determining the first predicted total unloading time length as the total unloading time length; and under the condition that the sum of the current unloading time length and the calibrated unloading time length does not reach the first predicted unloading total time length: determining the ratio of the second predicted total unloading time length to the first predicted total unloading time length; determining the second predicted total unloading time length as the total unloading time length under the condition that the ratio is within the preset range; and under the condition that the ratio is larger than the upper limit value of the preset range, obtaining the initial material level and the final material level of the dry-mixed mortar finished product bin in the next calibrated unloading time, re-determining the second predicted total unloading time according to the radius, the material stacking density, the initial material level and the final material level in the next calibrated unloading time and the target unloading quality until the ratio of the re-determined second predicted total unloading time to the first predicted total unloading time is in the preset range, and determining the re-determined second predicted total unloading time as the total unloading time.
In the embodiment of the invention, the control method for the dry-mixed mortar finished product bin further comprises the following steps: and under the condition that the ratio is smaller than the lower limit value of the preset range, giving out a warning to prompt that the material blockage problem possibly exists.
A second aspect of the present invention provides a controller configured to execute the control method for the dry-mixed mortar finished product silo of the foregoing embodiment.
The third aspect of the invention provides a control device for a dry-mixed mortar finished product bin, which comprises: the continuous level indicator is arranged inside the bin body of the dry-mixed mortar finished product bin and is configured to detect the level of the dry-mixed mortar in the bin body; the discharging screw is arranged at the discharging hole of the bin body and is configured to control the discharging flow and start and stop; and the controller of the foregoing embodiment.
The fourth aspect of the invention provides a dry-mixed mortar finished product bin, which comprises: a bin body configured to contain dry mixed mortar; and the control device for the dry-mixed mortar finished product bin of the embodiment.
According to the embodiment of the invention, through the technical scheme, the weighing in real time can be realized without installing a weighbridge in the unloading process, the purchasing and civil engineering construction cost of a weighbridge system is saved, the total unloading time length meeting the preset requirement can be automatically determined only by setting the flow conversion value and the target unloading quality and reading the material level data detected by the continuous material level meter, so that the accurate unloading starting/stopping action of the target unloading quality can be automatically carried out through one-key operation, the method can be realized on the basis of the original equipment of the existing dry-mixed mortar finished product bin, no additional equipment is needed, and the occupied area and the cost are saved.
Additional features and advantages of embodiments of the invention will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the embodiments of the invention without limiting the embodiments of the invention. In the drawings:
FIG. 1 is a schematic flow chart of a control method 100 for a dry-mixed mortar finished product bin according to an embodiment of the invention;
FIG. 2 is a schematic structural diagram of a control device 200 for a dry-mixed mortar finished product bin according to an embodiment of the invention;
FIG. 3 is a schematic structural diagram of a dry-mixed mortar finished product bin 300 according to an embodiment of the invention; and
FIG. 4 is a schematic view of a discharging scene of the dry-mixed mortar finished product bin according to the example of the invention.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating embodiments of the invention, are given by way of illustration and explanation only, not limitation.
It should be noted that, if directional indications (such as up, down, left, right, front, and rear … …) are referred to in the embodiments of the present application, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are changed accordingly.
In addition, if there is a description of "first", "second", etc. in the embodiments of the present application, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between the various embodiments can be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present application.
As shown in fig. 1, in an embodiment of the present invention, a control method 100 for a dry-mixed mortar finished product bin is provided, which includes the following steps:
step S110: and acquiring the flow conversion value of the discharge screw of the dry-mixed mortar finished product bin and the target discharge quality of the dry-mixed mortar finished product bin.
Step S120: and determining a first predicted total unloading time according to the flow conversion value and the target unloading quality. The flow conversion value is also the discharge flow which is to be realized by the discharge screw. The flow conversion value is not changed once being obtained in the one-time unloading process of the dry-mixed mortar finished product bin. Therefore, the time required for finishing the unloading of the target unloading quality, namely the first total predicted unloading time can be estimated under the ideal condition that the actual realized unloading flow of the dry-mixed mortar finished product bin is the flow of the flow conversion value according to the unloading flow, namely the flow conversion value, which is to be realized by the unloading screw.
Step S130: and obtaining the radius of the dry-mixed mortar finished product bin and the material bulk density of the dry-mixed mortar finished product bin.
Step S140: and obtaining the initial material level and the final material level of the dry-mixed mortar finished product bin within the current calibration unloading time.
Step S150: and determining a second predicted total unloading time according to the radius, the material bulk density, the initial material level, the final material level and the target unloading quality. And
step S160: and controlling the total unloading time of the dry-mixed mortar finished product bin according to the first predicted total unloading time and the second predicted total unloading time.
Specifically, the flow conversion value of the discharge screw of the dry-mixed mortar finished product bin is obtained, that is, step S110 includes, for example:
(a1) and acquiring the material bulk density of the dry-mixed mortar finished product bin and the material filling coefficient of the dry-mixed mortar finished product bin. And
(a2) and determining a flow conversion value according to the material bulk density and the material filling coefficient.
Specifically, the flow conversion value is determined based on the bulk density of the material and the fill factor of the material, that is, step (a2) includes, for example: the flow conversion is determined according to the following formula: q1 ═ 47D2nt ρ Ψ C. Wherein Q1 is a flow conversion value, D is a blade diameter of the discharge screw, n is a shaft rotation speed of the discharge screw, t is a blade pitch of the discharge screw, ρ is a material bulk density, Ψ is a material filling coefficient, and C is an inclination correction coefficient of the discharge screw.
It is also worth mentioning that the flow conversion value of the discharge screw of the dry-mixed mortar finished product bin can be obtained by reading a flow conversion value which is calculated in advance or set.
Correspondingly, the shaft rotation speed of the discharge screw may be, for example, a fixed shaft rotation speed or a non-fixed shaft rotation speed controlled by a frequency converter or the like, as long as the discharge screw is controlled to work at the fixed shaft rotation speed for discharging in the total discharge time period, or the discharge screw is controlled to control the shaft rotation speed of the discharge screw by taking the flow conversion value as a target of flow closed-loop control in the total discharge time period, so as to finally achieve the purpose of controlling the discharge flow actually realized to be as close as possible to the flow conversion value obtained in advance.
In particular, the target discharge quality is, for example, the maximum loading of the dry-mixed mortar truck without overloading. Of course, the embodiment of the present invention is not limited to this, and the target unloading quality may also be, for example, the total mass of other materials to be unloaded from the dry-mixed mortar finished product bin.
Specifically, the first predicted total discharge time period is defined as, for example: t1 is M/Q1. Wherein T1 is the first predicted total discharge time, M is the target discharge quality, and Q1 is the flow conversion value.
Specifically, the ratio of the first predicted total unloading time length to the calibrated unloading time length is not less than 10.
Specifically, the second predicted total discharge time is determined according to the radius, the bulk density of the material, the starting level and the final level, and the target discharge quality, that is, step S150 includes, for example:
(b1) and determining the discharge volume of the dry-mixed mortar finished product bin within the current calibration discharge time according to the radius, the initial material level and the final material level.
(b2) And determining the actual flow of the discharging screw in the current calibration discharging time according to the discharging volume and the material bulk density. And
(b3) and determining a second predicted total unloading time according to the actual flow and the target unloading quality.
Specifically, the second predicted total discharge time period is defined as, for example: t2 is M/Q2.
Wherein T2 is the second predicted total discharge time, M is the target discharge quality, and Q2 is the actual flow.
Wherein, Q2 is rho V/T0, and rho is the material bulk density, and V is the volume of unloading, and T0 is the calibration length of time of unloading.
Wherein the content of the first and second substances,
v is the discharge volume, f (x) is the radius, x is the material level of the dry-mixed mortar finished product bin, a is the initial material level, and b is the final material level.
Specifically, the total unloading time length of the dry-mixed mortar finished product bin is controlled according to the first predicted total unloading time length and the second predicted total unloading time length, that is, step S160 includes, for example:
(c1) and determining whether the sum of the current unloading time length and the calibrated unloading time length of the dry-mixed mortar finished product bin reaches a first predicted total unloading time length.
(c2) And under the condition that the sum of the current unloading time length and the calibrated unloading time length reaches the first predicted total unloading time length, determining the first predicted total unloading time length as the total unloading time length. And
(c3) the method comprises the following steps of when the sum of the current unloading time length and the calibrated unloading time length does not reach a first predicted total unloading time length:
(c31) and determining the ratio of the second predicted total unloading time length to the first predicted total unloading time length.
(c32) And under the condition that the ratio is within the preset range, determining the second predicted total unloading time length as the total unloading time length. And
(c33) and under the condition that the ratio is larger than the upper limit value of the preset range, obtaining the initial material level and the final material level of the dry-mixed mortar finished product bin in the next calibrated unloading time, re-determining the second predicted total unloading time according to the radius, the material bulk density, the initial material level and the final material level in the next calibrated unloading time and the target unloading quality until the ratio of the re-determined second predicted total unloading time to the first predicted total unloading time is in the preset range, and determining the re-determined second predicted total unloading time as the total unloading time.
Further, the control method 100 for the dry-mixed mortar finished product bin, for example, further includes the steps of: and under the condition that the ratio is smaller than the lower limit value of the preset range, giving out a warning to prompt that the material blockage problem possibly exists.
Specifically, the lower limit value ranges from 0.8 to 0.9, and the upper limit value ranges from 1.05 to 1.15.
More specifically, the lower limit value is, for example, 0.85, and the upper limit value is, for example, 1.15.
In an embodiment of the invention, a controller is provided, for example configured to perform the control method 100 for a dry-mixed mortar finished bin according to any one of the preceding embodiments. The specific functions and details of the control method 100 for the dry-mixed mortar finished product bin may refer to the related descriptions of the foregoing embodiments, and are not described herein again.
Specifically, the controller may be a control device such as an industrial personal computer, an embedded system, a microprocessor, and a programmable logic device.
As shown in fig. 2, in an embodiment of the present invention, a control device 200 for a dry-mixed mortar finished product bin is provided, including: a controller 210, a continuous level gauge 230 and a discharge screw 250.
Wherein the controller 210 is, for example, a controller according to any one of the previous embodiments. The detailed functions and details of the controller 210 can be referred to the related descriptions of the foregoing embodiments, and are not repeated herein.
A continuous level gauge 230 is provided, for example, inside the bin body of the finished dry-mixed mortar bin, the continuous level gauge being configured to detect the level of dry-mixed mortar in the bin body. In other embodiments, the continuous level gauge 230 may also be replaced with a level sensing device such as a weighted level gauge or a guided wave radar level gauge, for example.
In addition, it is worth mentioning that, in the embodiment of the invention, for example, a flow detection device such as an electromagnetic flow meter can be installed at the discharge spiral outlet to accurately measure the real-time flow.
A discharge screw 250 is provided, for example, at the discharge of the cartridge body, and is configured to control the flow rate of discharge as well as to start and stop.
In an embodiment of the present invention, a dry-mixed mortar finished product bin 300 is provided, including: a control device 310 and a cartridge body 330.
The control device 310 is, for example, the control device 200 for the dry-mixed mortar finished product bin according to any one of the foregoing embodiments. For the detailed functions and details of the control device 310, reference may be made to the related descriptions of the foregoing embodiments, which are not repeated herein.
The cartridge body 330 is configured to contain, for example, dry mixed mortar.
The following describes the operation processes of the control method 100 for the dry-mixed mortar finished product bin, the control device 200 for the dry-mixed mortar finished product bin and the dry-mixed mortar finished product bin 300 according to the embodiment of the present invention with reference to an example, which includes the following specific contents:
1. the schematic view of the unloading scene of the dry-mixed mortar finished product bin is shown in fig. 4. And the transport vehicle enters an unloading area below the dry-mixed mortar finished product bin, and the transport vehicle is in butt joint with a bulk machine of the dry-mixed mortar finished product bin to wait for the start of an unloading process. Before the unloading process is started, the conveying flow rate, namely the flow rate conversion value Q1, during the operation of the unloading screw is converted according to the relevant parameters of the unloading screw (such as XL in fig. 4) of the dry-mixed mortar finished product bin and the relevant parameters of materials, and the specific conversion formula is as follows:
Q1＝47D2ntρΨC。
wherein the unit of Q1 is t/h.
D is the blade diameter of the discharge screw, and the unit is m.
n is the shaft speed of the discharge screw in r/min. The shaft speed of the discharge screw in the example of the invention is a fixed speed. The shaft speed of the discharge screw is determined by the rotational speed of the motor (DJ in fig. 4) of the discharge screw.
t is the blade pitch of the discharge screw in m. For a full leaf helix, t is 0.8D.
Rho is the bulk density of the material and has the unit of t/m3。
Psi is a material filling coefficient, and psi is 0.45 for materials which are basically not abraded, such as flour, grains and the like; taking psi as 0.33 for materials with smaller abrasion such as sand, cement and the like; for materials with larger abrasion, such as slag and the like, psi is 0.15.
And C is an inclination correction coefficient of the discharge screw, and the value of the inclination correction coefficient is related to the conveying inclination angle theta of the discharge screw, and is specifically shown in Table 1.
TABLE 1
2. According to the latest over-limit and over-load determination standard of the road freight vehicle, the total mass limit TW (limit) of the transport vehicle is determined, the maximum total mass TW (total) of the transport vehicle under the condition that the over-limit and over-load determination standard of the road freight vehicle is met, namely not more than TW (limit) and the load limit of the vehicle is met at the same time is determined, and the predicted loading TW (loading) of the transport vehicle is calculated by subtracting the empty total mass TW (empty) of the transport vehicle from the determined maximum total mass TW (total) of the transport vehicle. Wherein, TW (total) is less than or equal to TW (limit), TW (loading amount) is TW (total) -TW (empty). The predicted load TW (load) is taken as the target discharge mass M.
3. Setting a flow equivalent Q1 and a target unloading mass M value in a controller of a dry-mixed mortar finished product bin control system, such as an upper computer, controlling an unloading screw to start unloading, calculating theoretical unloading time as a first predicted unloading total time T1 by the controller according to the set flow equivalent Q1 and the target unloading mass M value, continuously detecting the material level of the material in a dry-mixed mortar finished product bin body by a continuous material level meter (such as LWJ in FIG. 4) in the dry-mixed mortar finished product bin body, acquiring the initial material level and the final material level of the current calibrated unloading time and calculating to obtain an actual flow Q2 by the controller, calculating predicted actual unloading time as a second predicted unloading total time T2 according to the actual flow Q2 and the target unloading mass M value, comparing the first predicted unloading total time T1 with the second predicted unloading total time T2, and comparing whether the relation between the first predicted total unloading time length T1 and the second predicted total unloading time length T2 corresponding to the current calibrated unloading time length meets the preset requirement or not, if so, taking the second predicted total unloading time length T2 corresponding to the current calibrated unloading time length as the total unloading time length of the whole unloading process, controlling the unloading screw to stop unloading when the total unloading time length is reached, and if the relation between the first predicted total unloading time length T1 and the second predicted total unloading time length T2 corresponding to the current calibrated unloading time length fails to meet the preset requirement, determining whether to execute fault reminding operation or obtain the second predicted total unloading time length T2 corresponding to the next calibrated unloading time length according to a specific comparison result until the preset requirement is met. In addition, in order to avoid that the second predicted total unloading time T2 which can not meet the preset requirement is obtained all the time, the controller firstly obtains whether the sum of the current unloading time and the calibrated unloading time reaches the theoretical unloading time, namely the first predicted total unloading time T1, before obtaining the initial material level and the final material level of the current calibrated unloading time each time, and if the sum exceeds the time, the theoretical unloading time, namely the first predicted total unloading time T1 is used as the total unloading time of the whole unloading process to control the unloading stop time of the unloading screw. And when the unloading time reaches the total unloading time, the transport vehicle drives out of the unloading area below the dry-mixed mortar finished product bin after the unloading screw stops unloading.
The calculation formula and the comparison rule related to determining the total unloading time of the whole unloading process are as follows:
3.1 the theoretical discharging time, i.e. the first predicted total discharging time period T1, is calculated by the following formula: t1 ═ M/Q1, and T1 has the unit h.
3.2 the calculation formula of the calibrated discharging time length T0 is as follows: t0 ═ T1/N. Wherein, N is the self-defined discharge time calibration times, and N is an integer not less than 10, for example.
3.3 as shown in fig. 4, the bin body of the dry-mixed mortar finished product bin of the example of the invention is a rotating body, and according to the rotating body volume calculation formula, the calculation formula of the discharge volume V in the time period corresponding to the calibrated discharge time length T0 is as follows:
wherein f (x) is the radius of the bin body, x is the material level of the dry-mixed mortar finished product bin, a is the initial material level in the time period corresponding to the calibrated unloading time length T0, b is the final material level in the time period corresponding to the calibrated unloading time length T0, and the unit of V is m3And O in fig. 4 is the origin of the xOy coordinate system.
3.4 calibrating the calculation formula of the actual flow Q2 of the discharging screw in the time period corresponding to the discharging time length T0 as follows: and Q2 is rho V/T0, rho is the bulk density of the material, V is the discharge volume, T0 is the nominal discharge time length, and Q2 unit is T/h.
3.5 the second predicted total discharge time period T2 is calculated as: t2 ═ M/Q2, and T2 has the unit h.
3.6 the comparison rule of the relationship between the first predicted total unloading time length T1 and the second predicted total unloading time length T2 is as follows:
(1) when the preset requirement, namely 0.85T1 and T2 and 1.15T1 are met, the total unloading time length is set to be T2.
(2) And when the preset requirement is not met and T2 is greater than 1.15T1, acquiring a second predicted total unloading time T2 corresponding to the next calibrated unloading time.
(3) When the preset requirement is not met and T2 is less than 0.85T1, the controller sends out a warning to remind that whether a material blockage problem occurs in the finished product bin discharging system or not needs to be checked.
In summary, the foregoing technical solutions of the embodiments of the present invention can achieve the following beneficial effects:
(1) is economical and applicable
The wagon balance system has the advantages that the wagon balance does not need to be installed for weighing in real time in the unloading process, and the purchasing and civil engineering construction cost of the wagon balance system is saved.
(2) Simple operation, high efficiency and convenience
The total discharging time meeting the preset requirement can be automatically determined only by setting a flow conversion value and the target discharging quality and reading the material level data detected by the continuous material level meter, so that the accurate discharging start/stop action of the target discharging quality can be automatically carried out by one-key operation.
(3) Simple and compact structure
The method can be realized on the basis of the original equipment of the existing dry-mixed mortar finished product bin, no additional equipment is needed, and the occupied area and the cost are saved.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
In a typical configuration, a computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.
The memory may include forms of volatile memory in a computer readable medium, Random Access Memory (RAM) and/or non-volatile memory, such as Read Only Memory (ROM) or flash memory (flash RAM). The memory is an example of a computer-readable medium.
Computer-readable media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), Static Random Access Memory (SRAM), Dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), Read Only Memory (ROM), Electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), Digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information that can be accessed by a computing device. As defined herein, a computer readable medium does not include a transitory computer readable medium such as a modulated data signal and a carrier wave.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in the process, method, article, or apparatus that comprises the element.
The above are merely examples of the present invention, and are not intended to limit the present invention. Various modifications and alterations to this invention will become apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.
Claims (10)
1. A control method for a dry-mixed mortar finished product bin is characterized by comprising the following steps:
acquiring a flow conversion value of a discharge screw of the dry-mixed mortar finished product bin and a target discharge quality of the dry-mixed mortar finished product bin;
determining a first predicted total unloading time according to the flow conversion value and the target unloading quality;
acquiring the radius of the dry-mixed mortar finished product bin and the material bulk density of the dry-mixed mortar finished product bin;
obtaining the initial material level and the final material level of the dry-mixed mortar finished product bin within the current calibration unloading time;
determining a second predicted total unloading time length according to the radius, the material bulk density, the initial material level and the final material level and the target unloading quality; and
and controlling the total unloading time of the dry-mixed mortar finished product bin according to the first predicted total unloading time and the second predicted total unloading time.
2. The control method according to claim 1, wherein the obtaining of the flow conversion value of the discharge screw of the dry-mixed mortar finished product bin comprises:
acquiring the material bulk density of the dry-mixed mortar finished product bin and the material filling coefficient of the dry-mixed mortar finished product bin; and
determining the flow conversion value according to the material bulk density and the material filling coefficient;
wherein the flow conversion value is defined as:
Q1＝47D2ntρΨC；
wherein Q1 is the flow conversion value, D is the blade diameter of the discharge screw, n is the shaft rotation speed of the discharge screw, t is the blade pitch of the discharge screw, ρ is the material bulk density, Ψ is the material filling factor, and C is the inclination correction factor of the discharge screw.
3. The control method according to claim 1, wherein the first predicted total dump time period is defined as:
T1＝M/Q1；
wherein T1 is the first predicted total discharge time, M is the target discharge quality, and Q1 is the flow conversion value.
4. The control method of claim 1, wherein said determining a second predicted total discharge duration based on said radius, said material bulk density, said starting and final levels, and said target discharge quality comprises:
determining the discharge volume of the dry-mixed mortar finished product bin within the current calibration discharge time according to the radius, the initial material level and the final material level;
determining the actual flow of the discharging screw in the current calibration discharging time length according to the discharging volume and the material bulk density; and
and determining the second predicted total unloading time according to the actual flow and the target unloading quality.
5. The control method according to claim 4, wherein the second predicted total discharge time period is defined as:
T2＝M/Q2；
wherein T2 is the second predicted total discharge time, M is the target discharge quality, and Q2 is the actual flow rate;
wherein Q2 is ρ V/T0, ρ is the bulk density of the material, V is the discharge volume, and T0 is the calibrated discharge duration;
wherein the content of the first and second substances,
v is the unloading volume, f (x) is the radius, x is the material level of the dry-mixed mortar finished product bin, a is the initial material level, and b is the final material level.
6. The control method according to claim 1, wherein the controlling the total discharge time length of the finished dry-mixed mortar bin according to the first predicted total discharge time length and the second predicted total discharge time length comprises:
determining whether the sum of the current unloading time length of the dry-mixed mortar finished product bin and the calibrated unloading time length reaches the first predicted total unloading time length;
determining the first predicted total unloading time length as the total unloading time length under the condition that the sum of the current unloading time length and the calibrated unloading time length reaches the first predicted total unloading time length; and
under the condition that the sum of the current unloading time length and the calibrated unloading time length does not reach the first predicted total unloading time length:
determining the ratio of the second predicted total unloading time length to the first predicted total unloading time length;
determining the second predicted total unloading time length as the total unloading time length under the condition that the ratio is within a preset range; and
and under the condition that the ratio is larger than the upper limit value of the preset range, obtaining the initial material level and the final material level of the dry-mixed mortar finished product bin in the next calibrated unloading time, re-determining the second predicted total unloading time according to the radius, the material bulk density, the initial material level and the final material level in the next calibrated unloading time and the target unloading quality until the ratio of the re-determined second predicted total unloading time to the first predicted total unloading time is in the preset range, and determining the re-determined second predicted total unloading time as the total unloading time.
7. The control method according to claim 6, characterized by further comprising:
and under the condition that the ratio is smaller than the lower limit value of the preset range, giving out a warning to prompt that the material blockage problem possibly exists.
8. A controller, characterized by being configured to execute the control method for a dry-mixed mortar finished product silo according to any one of claims 1 to 7.
9. A controlling means for dry-mixed mortar finished product storehouse, its characterized in that includes:
a continuous level indicator disposed inside a bin body of the dry-mixed mortar finished product bin, the continuous level indicator configured to detect a level of dry-mixed mortar in the bin body;
the discharging screw is arranged at the discharging hole of the bin body and is configured to control the discharging flow and start and stop; and
the controller of claim 8.
10. The dry-mixed mortar finished product bin is characterized by comprising the following components:
a bin body configured to contain dry mixed mortar; and
the control device for the dry-mixed mortar finished product bin according to claim 9.
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Cited By (1)
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