CN112405864A - Mixing station cooperative unloading method and device - Google Patents
Mixing station cooperative unloading method and device Download PDFInfo
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- CN112405864A CN112405864A CN202011211003.1A CN202011211003A CN112405864A CN 112405864 A CN112405864 A CN 112405864A CN 202011211003 A CN202011211003 A CN 202011211003A CN 112405864 A CN112405864 A CN 112405864A
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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
- B28C7/00—Controlling the operation of apparatus for producing mixtures of clay or cement with other substances; Supplying or proportioning the ingredients for mixing clay or cement with other substances; Discharging the mixture
- B28C7/16—Discharge means, e.g. with intermediate storage of fresh concrete
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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
- B28C5/42—Apparatus specially adapted for being mounted on vehicles with provision for mixing during transport
- B28C5/4203—Details; Accessories
- B28C5/4234—Charge or discharge systems therefor
- B28C5/4237—Charging, e.g. hoppers
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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
- B28C7/00—Controlling the operation of apparatus for producing mixtures of clay or cement with other substances; Supplying or proportioning the ingredients for mixing clay or cement with other substances; Discharging the mixture
- B28C7/02—Controlling the operation of the mixing
Abstract
The invention relates to the technical field of mixing station unloading, and provides a mixing station cooperative unloading method and a mixing station cooperative unloading device, wherein the method comprises the following steps: continuously acquiring the unloading speed of the stirring main machine and the liquid level height of the material in the feeding port in the unloading process; calculating the variation of the liquid level height of the material in the feed port in a preset time period according to the continuously acquired liquid level height of the material in the feed port; and determining that the liquid level height of the material in the feed port is not less than a preset liquid level threshold value and the variation of the liquid level height of the material in the feed port in a preset time period is greater than zero, and gradually reducing the opening degree of the discharge door until the discharge rate of the stirring host machine meets a preset condition and the liquid level height of the material in the feed port is less than the preset liquid level threshold value. The technical scheme provided by the invention can automatically and accurately adjust the opening of the discharging door according to the actual discharging condition, thereby preventing material overflow and improving the discharging efficiency.
Description
Technical Field
The invention relates to the technical field of mixing station discharging, in particular to a mixing station cooperative discharging method and a mixing station cooperative discharging device.
Background
The mixing plant is usually referred to as a concrete mixing plant. The concrete mixing plant mainly comprises a mixing main machine, wherein the mixing main machine is used for mixing and stirring all raw materials to form concrete. The bottom of stirring host computer is provided with the discharge opening with this stirring host computer intercommunication, and still is equipped with the discharge door that is used for controlling this discharge opening and opens and close between stirring host computer and the discharge opening. The finished concrete is unloaded from the main mixer into the mixing tank of the mixer truck and then transported to the destination by the mixer truck.
In the process of unloading at the mixing plant, the feed inlet of the mixing tank of the mixing truck is positioned under the discharge port, concrete falls into the mixing tank through the mixing host, the discharge port and the feed inlet in sequence, and concrete overflow in the feed inlet can be prevented through reducing the opening degree of the discharge door.
The existing mixing station cooperative discharging method generally observes the discharging condition of concrete in a feeding hole through a camera and judges whether the feeding hole has flash or not through the experience of an operator. When operating personnel judges through the camera that can take place the flash, the aperture of manual reduction discharge door, until operating personnel think flash risk disappearance. Obviously, the purely manual operation mode is not only cumbersome, but also very inaccurate in judgment. In actual work, in order to avoid flash, an operator usually reduces the opening degree of the discharge door as much as possible, so that the discharging efficiency is greatly reduced.
Disclosure of Invention
In view of the above, the present invention is directed to a method and an apparatus for cooperative unloading in a mixing station, which can automatically and accurately adjust the opening of a discharge door according to an actual unloading situation, thereby improving the unloading efficiency while preventing material overflow.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a mixing station cooperative unloading method is applied to a mixing station unloading system, and the mixing station unloading system comprises: the stirring device comprises a stirring main machine, a discharge opening arranged at the bottom end of the stirring main machine and a feed inlet positioned right below the discharge opening; the materials sequentially pass through the stirring main machine, the discharge opening and the feed opening and enter a stirring tank corresponding to the feed opening; a discharge door used for controlling the opening and closing of the discharge opening is further arranged between the stirring main machine and the discharge opening; the method comprises the following steps:
continuously acquiring the unloading speed of the stirring main machine and the liquid level height of the material in the feeding port in the unloading process;
calculating the variation of the liquid level height of the material in the feed port in a preset time period according to the continuously acquired liquid level height of the material in the feed port;
and determining that the liquid level height of the material in the feed port is not less than a preset liquid level threshold value and the variation of the liquid level height of the material in the feed port in the preset time period is greater than zero, and gradually reducing the opening degree of the discharge door until the discharging speed of the stirring host machine meets a preset condition and the liquid level height of the material in the feed port is less than the preset liquid level threshold value.
Further, the method further comprises:
and determining that the discharging speed of the stirring host meets the preset condition, the liquid level height of the material in the feeding port is smaller than the preset liquid level threshold value, and gradually increasing the opening degree of the discharging door.
Preferably, said gradually decreasing the opening degree of the discharge door comprises:
reducing the opening degree of the discharge door at a constant speed;
the gradual increase the aperture of discharge door includes:
and increasing the opening degree of the discharge door at a constant speed.
Further, prior to the gradually decreasing the opening of the discharge door, the method further comprises:
calculating the material overflow risk degree of the material in the feed inlet; then the process of the first step is carried out,
reduce at the uniform velocity the aperture of discharge door includes:
when the risk degree of material overflow in the feed port is smaller than a preset risk degree threshold value, reducing the opening degree of the discharge door at a constant speed at a preset first speed;
when the risk degree of material overflow in the feed port is not less than a preset risk degree threshold value, reducing the opening degree of the discharge door at a constant speed at a preset second speed; wherein the preset second rate is greater than the preset first rate.
Preferably, the preset conditions include:
the discharge rate of the stirring main machine is not more than the feeding rate of the stirring tank.
Preferably, in the process of gradually reducing the opening degree of the discharge door, the following relation is adopted to judge that the discharge rate of the stirring main machine is not greater than the feeding rate of the stirring tank:
|Vm1′-Vm′|≥Vm
wherein, Vm1' is the unloading speed of the stirring host machine at a certain moment in the process of gradually reducing the opening degree of the discharging door; vm' is the unloading speed of the stirring main machine at the initial moment of gradually reducing the opening degree of the discharging door; vmThe mass change rate of the material in the feed inlet is at the initial moment of gradually reducing the opening degree of the discharge door.
Preferably, the mass change rate of the material in the feed port is calculated using the following formula:
wherein rho is the density of the material; Δ t is the predetermined time period; Δ h isA change in the level of material in the feed port over the predetermined period of time; r is11/2 being the value of the liquid level width of the material in the feed port at the initial moment of the predetermined time period; r is21/2 is the value of the liquid level width of the material in the feed inlet at the end of the preset time period.
Preferably, the liquid level width value of the material in the feeding port is obtained by the following steps:
calculating the liquid level width value of the material in the feed inlet according to the distance between the first visual ranging sensor and a first junction point acquired by the first visual ranging sensor, the distance between the second visual ranging sensor and a second junction point acquired by the second visual ranging sensor, the vertical distance between the first visual ranging sensor or the second visual ranging sensor and the liquid level of the material in the feed inlet acquired in advance, and the horizontal distance between the first visual ranging sensor and the second visual ranging sensor acquired in advance; wherein the content of the first and second substances,
the first visual ranging sensor and the second visual ranging sensor are respectively and symmetrically arranged on two sides of the outer wall of the discharge opening along the central axis of the discharge opening; the first junction point is the junction point of the liquid level of the material in the feed inlet and the inner wall of the feed inlet, which is positioned on the same side with the first visual ranging sensor, and the second junction point is the junction point of the liquid level of the material in the feed inlet and the inner wall of the feed inlet, which is positioned on the same side with the second visual ranging sensor.
Preferably, the continuously acquiring the discharge rate of the stirring main machine comprises:
and obtaining the mass change rate of the materials in the stirring main machine as the discharging rate of the stirring main machine through a weight sensor arranged at the lower part of the outer wall of the stirring main machine.
Preferably, the continuously acquiring the liquid level of the material in the feed inlet comprises:
obtaining a vertical distance between a height sensor and the liquid level of the material in the feed port as a first height through the height sensor arranged on the outer wall of the discharge port;
taking the vertical distance between the height sensor and the bottom of the feed inlet, which is acquired in advance, as a second height;
and calculating the difference value between the second height and the first height to obtain the liquid level height of the material in the feed port.
Further, the method further comprises:
and determining that the liquid level height of the material in the feed port is not less than a preset liquid level threshold value and the variation of the liquid level height of the material in the feed port in the preset time period is greater than zero, and performing overflow alarm.
The invention also aims to provide the mixing station cooperative unloading device, which can automatically and accurately adjust the opening of the unloading door according to the actual unloading condition, thereby improving the unloading efficiency.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
the utility model provides a discharge apparatus in coordination with mixing station, is applied to mixing station discharge system, mixing station discharge system includes: the stirring device comprises a stirring main machine, a discharge opening arranged at the bottom end of the stirring main machine and a feed inlet positioned right below the discharge opening; the materials sequentially pass through the stirring main machine, the discharge opening and the feed opening and enter a stirring tank corresponding to the feed opening; a discharge door used for controlling the opening and closing of the discharge opening is further arranged between the stirring main machine and the discharge opening; the device comprises:
the unloading rate obtaining unit is used for continuously obtaining the unloading rate of the stirring host machine in the unloading process;
the liquid level height acquisition unit is used for continuously acquiring the liquid level height of the materials in the feed inlet in the unloading process;
the liquid level height variation acquiring unit is used for calculating variation of the liquid level height of the material in the feed port within a preset time period according to the continuously acquired liquid level height of the material in the feed port;
and the discharging opening control unit is used for adjusting the opening of the discharging door.
The invention also provides a computer storage medium on which a computer program is stored, which computer program, when executed by a processor, implements any of the above-mentioned mixing station cooperative discharging methods.
According to the stirring station cooperative unloading method and device, the liquid level height of the material in the feeding port is continuously obtained in the unloading process, the variation of the liquid level height of the material in the feeding port in a preset time period is calculated, whether the opening degree of the discharging door needs to be reduced or not is judged according to the liquid level height of the material in the feeding port and the variation of the liquid level height of the material in the preset time period, and if so, the opening degree of the discharging door is gradually reduced to meet the parameter requirement of the system. The technical scheme provided by the invention can automatically and accurately adjust the opening degree of the discharge door according to the actual discharge condition, and improve the discharge efficiency while preventing material overflow.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic structural diagram of a discharge system of a mixing station in the prior art;
FIG. 2 is a schematic structural diagram of a discharge system of a mixing station in an embodiment of the invention;
FIG. 3 is a first flowchart of a method according to an embodiment of the present invention;
FIG. 4 is a flowchart of a second method of an embodiment of the present invention;
FIG. 5 is a first schematic view of an apparatus according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a device according to an embodiment of the present invention.
Description of the reference numerals
1-stirring main machine 2-discharge opening 3-feeding opening 4-stirring tank
5-weight sensor 6-height sensor 7-visual distance measuring sensor
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.
The mixing station cooperative unloading method provided by the embodiment of the invention is applied to a mixing station unloading system, the existing mixing station unloading system is shown in figure 1, and the system comprises: the stirring device comprises a stirring main machine 1, a discharge opening 2 which is arranged at the bottom end of the stirring main machine 1 and is communicated with the stirring main machine 1, and a feed inlet 3 which is positioned right below the discharge opening 2; the materials sequentially enter a stirring tank 4 corresponding to a feeding hole 3 through a stirring main machine 1, a discharging hole 2 and the feeding hole 3; a discharge door for controlling the opening and closing of the discharge opening 2 is further arranged between the stirring main machine 1 and the discharge opening 2. In this embodiment, the material generally refers to concrete, but other materials that need to be discharged through the above discharging system may also be referred to according to actual needs, and the present disclosure is not limited herein.
Based on the mixing station unloading system, a mixing station cooperative unloading method provided by the embodiment of the invention is shown in fig. 3, and the method includes:
s101, continuously acquiring the unloading rate of the stirring host machine and the liquid level height of the material in the feed port in the unloading process;
in this embodiment, the discharge rate of the stirring host 1 is monitored in real time by continuously acquiring the discharge rate of the stirring host 1. Preferably, the discharge rate of the stirring main machine 1 is continuously obtained in the following way:
as shown in fig. 2, a weight sensor 5 is provided in advance at the lower part of the outer wall of the stirring main body 1; the mass change rate of the materials in the stirring main machine 1 is obtained through the weight sensor 5, and the mass change rate is used as the discharging rate of the stirring main machine 1.
Specifically, the weight sensor 5 obtains the weight/mass of the concrete inside the mixer main machine 1 at a certain time by measuring the pressure of the concrete inside the mixer main machine 1 to the side wall of the mixer main machine 1 at the certain time, calculates the mass change amount of the concrete inside the mixer main machine 1 in the preset time period by measuring the pressure of the concrete inside the mixer main machine 1 to the side wall of the mixer main machine 1 at the initial time and the end time of the preset time period within a short preset time period (for example, 50ms), then calculates the ratio of the mass change amount to the preset time period, obtains the mass change rate of the concrete inside the mixer main machine 1 at the certain time, and takes the mass change rate at the time as the discharge rate of the mixer main machine 1 at the time. The calculation formula is as follows:
wherein, VxThe discharge rate of the stirring main machine 1 at a certain moment; Δ t is the shorter predetermined time period; Δ m is the amount of change in the mass of the concrete in the mixer main body 1 in the above-described short preset time period.
It should be noted that the "preset time period" is a shorter time period, which is set for calculating the discharge rate of the stirring main machine 1 at a certain time, and the "preset time period" in other parts of this embodiment is also a shorter time period as in this embodiment, and preferably, the shorter preset time period is 50 ms. It is to be understood that 50ms is not to be taken as a limitation to the "preset time period," which may also be set to 30ms, 40ms, 60ms, etc., as long as the metering requirements are met.
In this embodiment, the liquid level of the material in the feed port 3 is continuously obtained to monitor the liquid level, so as to perform qualitative judgment on the flash risk of the feed port. Preferably, the liquid level of the material in the feed port 3 is continuously obtained in the following manner:
as shown in fig. 2, a height sensor 6 is provided in advance on the outer wall of the discharge port 2; the vertical distance between the height sensor 6 and the liquid level of the material in the feed port 3 is obtained through the height sensor 6 as a first height; taking the vertical distance between the height sensor 6 and the bottom of the feed inlet 3 acquired in advance as a second height; and calculating the difference between the second height and the first height to obtain the liquid level height of the material in the feed port 3. The calculation formula is as follows:
h＝hl2-hl1(formula 2)
Wherein h is the liquid level height of the material in the feed inlet 3; h isl1The vertical distance between the height sensor 6 and the liquid level of the material in the feed inlet 3; h isl2Is the vertical distance between the level sensor 6 and the bottom of the feed inlet 3. Wherein h isl2May be obtained by prior measurements.
In the actual discharging process, the liquid level of the concrete in the feeding hole 3 cannot be completely kept in a horizontal state, and the h is obtainedl1When the value of h is less than the first threshold value, a plurality of first height values can be obtained through a plurality of height sensors, and then the average value of the plurality of first height values is calculated to obtain the hl1The value of (c). Preferably, as shown in fig. 2, a first height sensor and a second height sensor are respectively arranged on two sides of the outer wall of the discharge opening 2 in advance, the two height sensors are symmetrical with the central axis of the discharge opening 2 to obtain first height values of symmetrical parts on the left side and the right side, and h is obtained by calculating the average value of the two first height valuesl1The value of (c).
It should be noted that, for the liquid level height in the feed inlet, the system needs to continuously and uninterruptedly monitor the liquid level height in the whole discharging process; the system can selectively and continuously monitor the discharging speed of the stirring main machine in the whole discharging process or only monitor the discharging speed of the stirring main machine in the process of gradually opening or gradually closing the discharging door.
Step S102, calculating the variation of the liquid level height of the material in the feed port in a preset time period according to the continuously acquired liquid level height of the material in the feed port;
the formula for calculating the variation of the liquid level height of the material in the feed port 3 in the preset time period is as follows:
Δh＝h2-h1(formula 3)
Wherein, Δ h is the variation of the liquid level height of the material in the feed inlet 3 in a preset time period; h is1The liquid level height of the material in the feed inlet 3 at the initial moment of the preset time period; h is2The height of the liquid level of the material in the feed inlet 3 at the end of the predetermined time period. Wherein the predetermined time period takes a value of 50 ms.
Step S103, determining that the liquid level height of the materials in the feed port is not less than a preset liquid level threshold value and the variation of the liquid level height of the materials in the feed port in the preset time period is greater than zero, and gradually reducing the opening degree of the discharge door until the discharging speed of the stirring host machine meets a preset condition and the liquid level height of the materials in the feed port is less than the preset liquid level threshold value.
In this embodiment, the preset liquid level threshold is an overflow warning value of the feed port; the variation of the liquid level height of the material in the feed port in the preset time period is larger than zero, which indicates that the liquid level in the feed port continuously rises; and conversely, the liquid level in the feed port is continuously reduced. When the liquid level height of material in the feed inlet reached flash early warning value, and the liquid level lasted rising, showed that the intraoral material of feed inlet has the flash risk, at this moment, need reduce the aperture of discharge door in order to reduce the speed of unloading of stirring host computer, and then eliminate the flash risk of feed inlet. When the liquid level height of the materials in the feed port does not reach the overflow early warning value or the liquid level in the feed port continuously drops, the situation that the materials in the feed port have no overflow risk is shown.
In this embodiment, the following method is adopted to determine that the risk of flash at the feed port 3 is eliminated: the discharging speed of the stirring main machine 1 meets the preset condition, and the liquid level height of the materials in the feeding hole 3 is smaller than the preset liquid level threshold value. Preferably, the preset conditions include: the discharge rate of the stirring main machine 1 is not more than the feeding rate of the stirring tank 4.
Because in the actual discharging process, the feeding rate of the stirring tank 4 is difficult to obtain, and it is difficult to implement by directly comparing the discharging rate of the stirring host 1 with the feeding rate of the stirring tank 4, in the process of gradually reducing the opening degree of the discharging door, the present embodiment adopts the following relational expression to quickly and accurately judge that the discharging rate of the stirring host is not greater than the feeding rate of the stirring tank:
|Vm1′-Vm′|≥Vm(formula 4)
Wherein, Vm1The discharging speed of the stirring host machine 1 at a certain moment is gradually reduced in the process of gradually reducing the opening degree of the discharging door; vmThe discharging speed of the stirring host machine 1 is gradually reduced at the initial moment of the opening of the discharging door; vmThe mass change rate of the material in the feed inlet 3 at the initial moment of gradually reducing the opening degree of the discharge door.
The principle that the discharging speed of the stirring main machine 1 is not greater than the feeding speed of the stirring tank 4 according to the formula 4 is as follows:
the liquid level height change of the feed port 3 of the mixer truck is caused by the material quality change in the feed port 3, and the material quality change in the feed port 3 is caused by the inconsistency of the discharge rate of the main mixer 1 and the feed rate of the mixing tank 4. The rate of change of the mass of the material in the feed port 3 is equal to the difference between the discharge rate of the stirring main machine 1 and the feed rate of the stirring tank 4. When the discharge rate is greater than the feed rate, the liquid level of the feed port 3 increases, and when the discharge rate is less than the feed rate, the liquid level of the feed port 3 decreases.
The material quality change rate of the feed inlet 3 is V when the flash risk occursmFrom the above description, VmSpeed of unloading-the feed rate of agitator tank of stirring host computer because feed rate is decided by the structure of trucd mixer itself, unable regulation and direct measurement just can only reduce the speed of unloading and come the material quality rate of change in the control feed inlet 3 through the aperture that reduces the discharge door. So when the discharge rate is reduced by VmAnd then, the unloading speed of the stirring main machine 1 is consistent with the feeding speed of the stirring tank 4, the mass of the material in the feeding port 3 is changed to be 0 at the moment, the unloading speed is continuously reduced, the unloading speed is smaller than the feeding speed, and the mass of the material in the feeding port 3 begins to be reducedThe liquid level begins to decrease. That is, when | Vm1′-Vm′|＝VmThe liquid level in the feed port 3 is maintained constant as | Vm1′-Vm′|>VmAt this time, the liquid level in the feed port 3 starts to fall.
In the above formula 4, Vm1' and Vm' both can be calculated by equation 1 above, and for the rate of change of mass of the material in the feed inlet 3 above, this embodiment is preferably calculated using the following equation:
wherein rho is the density of the material, namely the density of the disc concrete; Δ t is the predetermined time period, which is 50ms in this embodiment; delta h is the variation of the liquid level height of the material in the feed inlet 3 in the preset time period; r is11/2, which is the value of the liquid level width of the material in the feed inlet 3 at the initial moment of the preset time period; r is21/2 is the value of the liquid level width of the material in the feed inlet 3 at the end of the preset time period.
For the above-mentioned value of the liquid level width of the material in the inlet, the present embodiment is preferably obtained by the following method:
as shown in fig. 2, a first visual ranging sensor and a second visual ranging sensor are respectively arranged on two sides of the outer wall of the discharge opening 2 in advance, and the two visual ranging sensors 7 are symmetrical with the central axis of the discharge opening 2; taking the juncture of the liquid level of the material in the feed inlet and the inner wall of the feed inlet, which is positioned on the same side with the first visual ranging sensor, as a first juncture, and taking the juncture of the liquid level of the material in the feed inlet and the inner wall of the feed inlet, which is positioned on the same side with the second visual ranging sensor, as a second juncture; and calculating the liquid level width value of the material in the feed inlet according to the distance between the first visual ranging sensor and the first junction point, the distance between the second visual ranging sensor and the second junction point, the vertical distance between the first visual ranging sensor or the second visual ranging sensor and the liquid level of the material in the feed inlet, and the horizontal distance between the first visual ranging sensor and the second visual ranging sensor.
In the actual discharging process, the liquid level of the material in the feed port may be approximately regarded as a horizontal state although the liquid level may not be completely kept in the horizontal state, and therefore, the following formula may be specifically adopted to calculate the liquid level width value of the material in the feed port:
wherein 2r is the liquid level width value of the material in the feed inlet; l is1The distance between the first visual ranging sensor and the first junction point is obtained; l is2The distance between the second visual ranging sensor and the second junction point; h is0The vertical distance between the first visual ranging sensor or the second visual ranging sensor and the liquid level of the material in the feed inlet is set; l is3Is the horizontal distance between the first visual ranging sensor and the second visual ranging sensor. Wherein h is0The height sensor 6 may be directly measured by the first visual ranging sensor or the second visual ranging sensor, or may be installed at the same height position as the two visual ranging sensors 7 and measured in advance by the height sensor 6.
Through the steps S101 to S103, the system can automatically detect whether the feed inlet has the risk of material overflow at the current moment, and automatically and gradually reduce the opening degree of the discharge door when the feed inlet is detected to have the risk of material overflow until the risk of material overflow disappears. So, can greatly improve the degree of automation of the system of unloading, improve the degree of accuracy of judging the discharge door closing opportunity, degree of closing simultaneously to improve the efficiency of unloading.
As shown in fig. 4, the cooperative unloading method for the mixing station provided by the embodiment of the present invention further includes:
and step S104, determining that the liquid level height of the material in the feed port is not less than a preset liquid level threshold value and the variation of the liquid level height of the material in the feed port in the preset time period is greater than zero, and performing overflow alarm.
In the discharging process, when the feeding port is detected to have the flash risk, flash alarm is automatically carried out so that the staff can timely know the flash risk information.
As shown in fig. 4, the cooperative unloading method for the mixing station provided by the embodiment of the present invention further includes:
and S105, determining that the discharging speed of the stirring host meets the preset condition, the liquid level height of the materials in the feeding port is smaller than the preset liquid level threshold value, and gradually increasing the opening degree of the discharging door.
In order to further improve the unloading efficiency, when the system detects that the flash risk of the feeding hole is eliminated, after the system stops closing the unloading door, the unloading door is automatically and gradually opened, namely, the opening degree of the unloading door is gradually increased to gradually increase the unloading speed of the stirring host machine, and in the process, when the system detects that the flash risk exists in the feeding hole again, the opening degree of the unloading door is gradually reduced again. And repeating the opening and closing process of the discharging door until the discharging is finished.
In this embodiment, the opening of door includes gradually reducing: reducing the opening degree of the discharge door at a constant speed; the aperture of door is gone out in crescent, includes: the opening degree of the discharge door is increased at a constant speed. Namely, the discharge door is gradually opened or closed at a constant speed.
In order to accurately control the closing speed of the discharge door and further effectively avoid the occurrence of flash, before gradually decreasing the opening degree of the discharge door, the mixing station cooperative unloading method according to this embodiment further includes: calculating the material overflow risk degree of the material in the feed inlet; then, the at the uniform velocity reduces the aperture of discharge door includes: when the risk degree of material overflow in the feed port is smaller than a preset risk degree threshold value, reducing the opening degree of the discharge door at a constant speed at a preset first speed; when the risk degree of material overflow in the feed port is not less than a preset risk degree threshold value, reducing the opening degree of the discharge door at a constant speed at a preset second speed; wherein the preset second rate is greater than the preset first rate. Namely, when the risk degree of the overflowing material at the feeding hole is higher, the discharging door is closed at a faster speed; when the risk of the overflowing of the feeding hole is low, the discharging door is closed at a low speed, so that the overflowing is effectively avoided, and the discharging speed is not reduced.
In this embodiment, the formula 5 is used to calculate the flash risk, that is, the formula for calculating the mass change rate of the material in the feed port is used to calculate the flash risk. V in equation 5 when there is a flash risk at the feed inletmA value greater than 0, and VmA larger value indicates a greater risk of flash at the feed inlet.
An example of an application is as follows:
in the unloading process, the variation delta h of the liquid level height of the materials in the feeding port, which is acquired by the height sensor, is larger than 0, and the liquid level height h of the materials in the feeding port is larger than or equal to hmaxAnd performing overflow alarm, wherein h is the liquid level height of the material in the current feed inlet, and h ismaxIs a preset liquid level threshold value (namely a flash early warning value of the feeding hole). At the moment, the mass change rate of the material in the feed inlet is calculated through the parameters obtained by the visual ranging sensor, and the V at the moment is obtainedmThe value was 5kg/s, indicating that the material in the current inlet was increasing at a rate of 5 kg/s. At the moment, the industrial personal computer acquires the real-time unloading speed V of the stirring host machine by acquiring the change delta m1 of the weight sensor every 50ms to be 2.5kgm' -50 kg/s. In order to avoid material overflow, the industrial personal computer issues an instruction to reduce the opening degree of the discharge door, along with the reduction of the opening degree of the discharge door, the change of the weight sensor value delta m2 acquired every 50ms is gradually reduced, and when the delta m2 is 2.25kg, the real-time discharging speed of the stirring host is Vm1' -45 kg/s, satisfies | Vm1′-Vm′|≥VmMeanwhile, the height of the liquid level of the material in the current feed inlet is acquired through a height sensor, and if the current h is less than hmaxAnd namely, if the liquid level height of the material in the current feed port is smaller than a preset liquid level threshold value, the industrial personal computer issues an instruction to stop reducing the opening degree of the discharge door, and increases the opening degree of the discharge door again until next flash early warning, and repeats the reduction and increase operation of the opening degree of the discharge door until the discharge is completed.
Through the scheme, in the discharging process, the height sensor is used for collecting the real-time liquid level height during discharging, the overflow alarm qualitative judgment is carried out based on the change of the liquid level height of the feeding port and the set liquid level threshold value, the visual ranging sensor is introduced to calculate the real-time width of the liquid level, the real-time monitoring of the weight variation of the materials in the feeding port is realized, and the overflow risk degree is calculated quantitatively. And a weight sensor arranged at the lower part of the outer wall of the stirring host machine is used for acquiring data to calculate the real-time unloading speed. Confirm the switch opportunity of discharge door through the speed of monitoring of unloading, guarantee the efficiency of unloading when avoiding the flash, solved the technical problem that the discharge door aperture adjustment among the prior art is inaccurate, the inefficiency of unloading.
Correspondingly to the above embodiment, the present invention further provides a mixing station cooperative unloading apparatus, which is applied to a mixing station unloading system, where the existing mixing station unloading system is shown in fig. 1, and the system includes: the stirring device comprises a stirring main machine 1, a discharge opening 2 which is arranged at the bottom end of the stirring main machine 1 and is communicated with the stirring main machine 1, and a feed inlet 3 which is positioned right below the discharge opening 2; the materials sequentially enter a stirring tank 4 corresponding to a feeding hole 3 through a stirring main machine 1, a discharging hole 2 and the feeding hole 3; a discharge door for controlling the opening and closing of the discharge opening 2 is further arranged between the stirring main machine 1 and the discharge opening 2.
Based on the mixing station discharging system, the mixing station cooperative discharging device provided by the invention is shown in fig. 5, and the device comprises:
the unloading rate obtaining unit 201 is configured to continuously obtain an unloading rate of the stirring host in an unloading process;
a liquid level height obtaining unit 202, configured to continuously obtain a liquid level height of the material in the feed port during the discharging process;
the liquid level height variation obtaining unit 203 is used for calculating variation of the liquid level height of the material in the feed port within a preset time period according to the continuously obtained liquid level height of the material in the feed port;
and the discharge door opening control unit 204 is used for adjusting the opening of the discharge door.
Specifically, in this embodiment, the discharge door opening control unit 204 is configured to gradually decrease the opening of the discharge door when the liquid level of the material in the feed port is not less than a preset liquid level threshold and the variation of the liquid level of the material in the feed port in the predetermined time period is greater than zero, until the discharge rate of the stirring host meets a preset condition and the liquid level of the material in the feed port is less than the preset liquid level threshold.
Further, as shown in fig. 6, the apparatus further includes:
and the overflow alarm unit 205 is configured to perform overflow alarm when the liquid level height of the material in the feed port is not less than a preset liquid level threshold and the variation of the liquid level height of the material in the feed port in the preset time period is greater than zero.
Further, the discharge door opening control unit 204 is further configured to gradually increase the opening of the discharge door when the discharging rate of the stirring host meets the preset condition and the liquid level height of the material in the feed port is smaller than the preset liquid level threshold.
Further, the apparatus further comprises:
the flash risk degree calculating unit is used for calculating the flash risk degree of the material in the feed port; when the risk degree of material overflow in the feed port is smaller than a preset risk degree threshold value, reducing the opening degree of the discharge door at a constant speed at a preset first speed; when the risk degree of material overflow in the feed port is not less than a preset risk degree threshold value, reducing the opening degree of the discharge door at a constant speed at a preset second speed; wherein the preset second rate is greater than the preset first rate.
The working principle, the working flow and the like of the device relate to specific embodiments, which can be referred to the specific embodiments of the mixing station cooperative unloading method provided by the invention, and the detailed description of the same technical contents is omitted here.
The invention also provides a computer storage medium, on which a computer program is stored, which, when executed by a processor, implements the mixing station cooperative discharging method described in this embodiment.
The invention also provides terminal equipment which comprises a processor, wherein the processor is used for executing the mixing station cooperative discharging method described in the embodiment.
According to the stirring station cooperative unloading method and device, the liquid level height of the material in the feeding port is continuously obtained in the unloading process, the variation of the liquid level height of the material in the feeding port in a preset time period is calculated, whether the opening degree of the discharging door needs to be reduced or not is judged according to the liquid level height of the material in the feeding port and the variation of the liquid level height of the material in the preset time period, and if so, the opening degree of the discharging door is gradually reduced to meet the parameter requirement of the system. The technical scheme provided by the invention can automatically and accurately adjust the opening degree of the discharge door according to the actual discharge condition, and improve the discharge efficiency while preventing material overflow.
Meanwhile, the feeding condition of the feeding hole is judged by adopting a mode of additionally arranging the weight sensor on the outer wall of the stirring main machine and additionally arranging the height sensor and the visual ranging sensor on the outer wall of the discharging hole, and the discharging hole and the feeding hole are controlled to complete the discharging process in a coordinated mode, so that the intelligent degree of a discharging system can be improved, and the repeated labor and labor cost of operators are reduced. The height sensor carries out qualitative judgment on the flash risk of the feeding hole, the visual ranging sensor identifies the junction point of the material liquid level in the feeding hole and the inner wall of the feeding hole, and quantitative judgment is carried out on the flash risk of the feeding hole through calculation. The opening degree of the discharge door is adjusted according to qualitative and quantitative judgment, and the change of the discharge rate is calculated through the weight sensor so as to realize the automatic cooperative process, so that the discharge efficiency of the whole discharge system is ensured to the maximum extent while the material overflow is avoided.
In the using process, the invention does not need to stare at the unloading picture obtained by the camera all the time, thereby avoiding subjectivity and limitation of manual observation and judgment, and having higher objectivity and real-time property compared with the traditional collaborative unloading method. The flash situation caused by human errors can be effectively prevented. Meanwhile, the quantitative control method can qualitatively judge the flash risk and quantitatively judge the flash risk according to the sensor information, so that the quantitative control is performed, the opening and closing of the discharge door are controlled in time, the flash risk is eliminated, the maximum discharging efficiency is guaranteed, the reliable work is ensured, and the labor intensity is reduced.
Although the embodiments of the present invention have been described in detail with reference to the accompanying drawings, the embodiments of the present invention are not limited to the details of the above embodiments, and various simple modifications can be made to the technical solutions of the embodiments of the present invention within the technical idea of the embodiments of the present invention, and the simple modifications all belong to the protection scope of the embodiments of the present invention.
It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. In order to avoid unnecessary repetition, the embodiments of the present invention do not describe every possible combination.
Those skilled in the art will understand that all or part of the steps in the method according to the above embodiments may be implemented by a program, which is stored in a storage medium and includes several instructions to enable a single chip, a chip, or a processor (processor) to execute all or part of the steps in the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
In addition, any combination of different implementation manners of the embodiments of the present invention can be performed, and the embodiments of the present invention should be considered as disclosed in the embodiments of the present invention as long as the combination does not depart from the idea of the embodiments of the present invention.
Claims (13)
1. A mixing station cooperative unloading method is applied to a mixing station unloading system, and the mixing station unloading system comprises: the stirring device comprises a stirring main machine, a discharge opening arranged at the bottom end of the stirring main machine and a feed inlet positioned right below the discharge opening; the materials sequentially pass through the stirring main machine, the discharge opening and the feed opening and enter a stirring tank corresponding to the feed opening; a discharge door used for controlling the opening and closing of the discharge opening is further arranged between the stirring main machine and the discharge opening; characterized in that the method comprises:
continuously acquiring the unloading speed of the stirring main machine and the liquid level height of the material in the feeding port in the unloading process;
calculating the variation of the liquid level height of the material in the feed port in a preset time period according to the continuously acquired liquid level height of the material in the feed port;
and determining that the liquid level height of the material in the feed port is not less than a preset liquid level threshold value and the variation of the liquid level height of the material in the feed port in the preset time period is greater than zero, and gradually reducing the opening degree of the discharge door until the discharging speed of the stirring host machine meets a preset condition and the liquid level height of the material in the feed port is less than the preset liquid level threshold value.
2. The mixing station cooperative discharging method according to claim 1, further comprising:
and determining that the discharging speed of the stirring host meets the preset condition, the liquid level height of the material in the feeding port is smaller than the preset liquid level threshold value, and gradually increasing the opening degree of the discharging door.
3. The mixing station cooperative discharging method according to claim 2, wherein gradually decreasing the opening degree of the discharging door comprises:
reducing the opening degree of the discharge door at a constant speed;
the gradual increase the aperture of discharge door includes:
and increasing the opening degree of the discharge door at a constant speed.
4. The mixing station cooperative discharging method according to claim 3, wherein before said gradually decreasing the opening degree of the discharging door, the method further comprises:
calculating the material overflow risk degree of the material in the feed inlet; then the process of the first step is carried out,
reduce at the uniform velocity the aperture of discharge door includes:
when the risk degree of material overflow in the feed port is smaller than a preset risk degree threshold value, reducing the opening degree of the discharge door at a constant speed at a preset first speed;
when the risk degree of material overflow in the feed port is not less than a preset risk degree threshold value, reducing the opening degree of the discharge door at a constant speed at a preset second speed; wherein the preset second rate is greater than the preset first rate.
5. The mixing station cooperative discharging method according to claim 2, wherein the preset conditions comprise:
the discharge rate of the stirring main machine is not more than the feeding rate of the stirring tank.
6. The mixing station cooperative discharging method according to claim 5, wherein in the process of gradually reducing the opening degree of the discharging door, the discharging speed of the mixing main machine is judged to be not greater than the feeding speed of the mixing tank by using the following relation:
|Vm1′-Vm′|≥Vm
wherein, Vm1' is the unloading speed of the stirring host machine at a certain moment in the process of gradually reducing the opening degree of the discharging door; vm' is the unloading speed of the stirring main machine at the initial moment of gradually reducing the opening degree of the discharging door; vmThe mass change rate of the material in the feed inlet is at the initial moment of gradually reducing the opening degree of the discharge door.
7. The mixing station cooperative discharging method according to claim 6, wherein the mass change rate of the material in the feed port is calculated by using the following formula:
wherein rho is the density of the material; Δ t is the predetermined time period; Δ h is the variation of the liquid level height of the material in the feed port in the predetermined time period; r is11/2 being the value of the liquid level width of the material in the feed port at the initial moment of the predetermined time period; r is21/2 is the value of the liquid level width of the material in the feed inlet at the end of the preset time period.
8. The mixing station cooperative discharging method according to claim 7, wherein the liquid level width value of the material in the feeding port is obtained by:
calculating the liquid level width value of the material in the feed inlet according to the distance between the first visual ranging sensor and a first junction point acquired by the first visual ranging sensor, the distance between the second visual ranging sensor and a second junction point acquired by the second visual ranging sensor, the vertical distance between the first visual ranging sensor or the second visual ranging sensor and the liquid level of the material in the feed inlet acquired in advance, and the horizontal distance between the first visual ranging sensor and the second visual ranging sensor acquired in advance; wherein the content of the first and second substances,
the first visual ranging sensor and the second visual ranging sensor are respectively and symmetrically arranged on two sides of the outer wall of the discharge opening along the central axis of the discharge opening; the first junction point is the junction point of the liquid level of the material in the feed inlet and the inner wall of the feed inlet, which is positioned on the same side with the first visual ranging sensor, and the second junction point is the junction point of the liquid level of the material in the feed inlet and the inner wall of the feed inlet, which is positioned on the same side with the second visual ranging sensor.
9. The mixing station cooperative unloading method according to claim 1, wherein the continuously acquiring the unloading rate of the mixing host comprises:
and obtaining the mass change rate of the materials in the stirring main machine as the discharging rate of the stirring main machine through a weight sensor arranged at the lower part of the outer wall of the stirring main machine.
10. The mixing station cooperative discharging method according to claim 1, wherein the continuously acquiring the liquid level of the material in the feeding port comprises:
obtaining a vertical distance between a height sensor and the liquid level of the material in the feed port as a first height through the height sensor arranged on the outer wall of the discharge port;
taking the vertical distance between the height sensor and the bottom of the feed inlet, which is acquired in advance, as a second height;
and calculating the difference value between the second height and the first height to obtain the liquid level height of the material in the feed port.
11. The mixing station cooperative discharging method according to claim 1 or 2, wherein the method further comprises:
and determining that the liquid level height of the material in the feed port is not less than a preset liquid level threshold value and the variation of the liquid level height of the material in the feed port in the preset time period is greater than zero, and performing overflow alarm.
12. The utility model provides a discharge apparatus in coordination with mixing station, is applied to mixing station discharge system, mixing station discharge system includes: the stirring device comprises a stirring main machine, a discharge opening arranged at the bottom end of the stirring main machine and a feed inlet positioned right below the discharge opening; the materials sequentially pass through the stirring main machine, the discharge opening and the feed opening and enter a stirring tank corresponding to the feed opening; a discharge door used for controlling the opening and closing of the discharge opening is further arranged between the stirring main machine and the discharge opening; characterized in that the device comprises:
the unloading rate obtaining unit is used for continuously obtaining the unloading rate of the stirring host machine in the unloading process;
the liquid level height acquisition unit is used for continuously acquiring the liquid level height of the materials in the feed inlet in the unloading process;
the liquid level height variation acquiring unit is used for calculating variation of the liquid level height of the material in the feed port within a preset time period according to the continuously acquired liquid level height of the material in the feed port;
and the discharging opening control unit is used for adjusting the opening of the discharging door.
13. A computer storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the mixing station collaborative discharge method of any of claims 1 to 11.
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Address after: 415907 No.1 Zhonglian Avenue, Huangfu neighborhood committee, Hanshou high tech Industrial Park, Changde City, Hunan Province Patentee after: ZOOMLION HEAVY INDUSTRY SCIENCE AND TECHNOLOGY Co.,Ltd. Patentee after: Hunan Zoomlion concrete machinery station equipment Co., Ltd Address before: 410013 No. 361 South silver basin, Changsha, Hunan, Yuelu District Patentee before: ZOOMLION HEAVY INDUSTRY SCIENCE AND TECHNOLOGY Co.,Ltd. Patentee before: Hunan Zoomlion concrete machinery station equipment Co., Ltd |