CN106948245B - Control system of stabilized soil mixing station - Google Patents
Control system of stabilized soil mixing station Download PDFInfo
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- CN106948245B CN106948245B CN201710330625.8A CN201710330625A CN106948245B CN 106948245 B CN106948245 B CN 106948245B CN 201710330625 A CN201710330625 A CN 201710330625A CN 106948245 B CN106948245 B CN 106948245B
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C21/00—Apparatus or processes for surface soil stabilisation for road building or like purposes, e.g. mixing local aggregate with binder
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Abstract
The invention discloses a control system of a stabilized soil mixing station, which comprises: aggregate supply module, stabilizer supply module, clear water supply module, mixer and control module of control aggregate supply module, stabilizer supply module, clear water supply module's supply amount, and HMI human-computer interface. The aggregate supply module, the stabilizer supply module, the clear water supply module and the HMI human-machine interface are electrically connected with the control module through the PROFINET field bus. The invention has the beneficial effects that: the system has high communication speed, high response speed and high control precision, can effectively reduce the starting-up waste rate and can improve the quality of stabilized soil.
Description
Technical Field
The invention relates to the technical field of mixing station electric control systems, in particular to a control system of a stabilized soil mixing station.
Background
The stabilized soil is mainly composed of aggregate (such as slag, lime, sand, cobble), cement, water and the like, and the stabilized soil mixing station is a stirring system which is specially used for mixing and stirring the raw materials according to a certain proportion to form a stabilized mixture taking hydraulic materials as binding agents, and is widely used for the construction of base layers and bottom layers in engineering construction of roads and urban roads, goods yards, parking lots, aviation airports and the like.
The conventional stabilized soil mixing station generally adopts a MODBUS (or high-speed pulse) communication mode to control the mixing of stabilized soil, and has the following defects that the frequency of a driver and the speed of a motor are controlled: the communication rate is low, the system instantaneity is poor, and the control precision is low (usually only about 2 percent); 2) The dynamic response of the system is poor, and the stable proportion can be achieved after a certain period of time is required for starting, so that the starting waste rate is higher; 3) The belt scale has large starting current and is easy to be blocked to skip the current fault.
Disclosure of Invention
The invention mainly provides a control system of a stabilized soil mixing station, which aims to improve the communication efficiency, the response speed and the control precision of the control system and reduce the starting-up waste rate.
In order to achieve the above object, the control system of the stabilized soil mixing station according to the present invention includes: aggregate supply module, stabilizer supply module, clear water supply module, mixer and control module of control aggregate supply module, stabilizer supply module, clear water supply module's supply amount, and HMI human-computer interface. The aggregate supply module includes: the aggregate conveyor belt comprises a plurality of batching hoppers for loading aggregate, a plurality of belt scales, a plurality of first driving motors and a flat belt. Each belt scale is arranged below a discharge hole of the corresponding batching hopper and above the flat belt, and is respectively used for conveying aggregate to the flat belt. The flat belt is used to transport the aggregate to the mixer. Each first driving motor corresponds to the belt scales one by one and is used for driving the belt scales corresponding to the first driving motor to operate. The stabilizer supply module includes: and a second driving motor for controlling the operation of the screw conveyor. The clean water supply module includes: a water storage tank positioned above the stirrer and a water pump for controlling the water storage tank to supply water to the stirrer. Each first driving motor, each second driving motor and each water pump are electrically connected with the control module through the PROFINET field bus. The HMI human-machine interface is electrically connected with the control module through a PROFINET field bus.
Preferably, the first driving motor and the second driving motor are both permanent magnet synchronous motors.
Preferably, a first driving unit for controlling the forward and reverse rotation starting of the first driving motor is respectively arranged between each first driving motor and the control module. A second driving unit for controlling the forward and reverse rotation starting of the second driving motor is arranged between the second driving motor and the control module.
Preferably, a first detection circuit for detecting the phase current of the first driving motor is arranged in the first driving unit, the detection end of the first detection circuit is electrically connected with the output end of the first driving motor, and the output end of the first detection circuit is electrically connected with the control module. The second driving unit is internally provided with a second detection circuit for detecting the phase current of the second driving motor, the detection end of the second detection circuit is electrically connected with the phase current output end of the second driving motor, and the output end of the second detection circuit is electrically connected with the control module.
Preferably, the first detection circuit includes: sampling resistor R9, isolation amplifier U1 and operational amplifier U2.
The first end of the sampling resistor R9 is connected with the phase current output end of the first driving motor and is connected with the VIN+ end of the isolation amplifier through a resistor R6. The second end of the sampling resistor R9 is connected with the PE end of the first driving motor or the second driving motor, and is connected with the GND end and the VIN end of the isolation amplifier.
The OUT+ end of the isolation amplifier is connected with the inverting output end of the operational amplifier U2 through a resistor R1, and the OUT-end of the isolation amplifier is connected with the non-inverting input end of the operational amplifier U2 through a resistor R3.
The inverting input end of the operational amplifier U2 is connected with the output end thereof through a parallel circuit formed by R2 and C6, and the inverting input end thereof is connected with the non-inverting input end thereof through a capacitor C5. The non-inverting input terminal of the operational amplifier U2 is grounded through a parallel circuit formed by a resistor R4 and a capacitor C4. The output of the operational amplifier U2 is connected to a first end of a resistor R7. The second end of the resistor R7 is used as the output end of the first detection circuit or the second detection circuit, is connected with the control module, is connected with 3.3V direct-current voltage through the resistor R8, and is grounded through the capacitor C7.
Preferably, the first detection circuit further comprises a clamp protection circuit formed by reversely connecting two diodes D2 in parallel, wherein the common end of the clamp protection circuit is connected with the second end of the resistor R7, the positive end of the clamp protection circuit is connected with 3.3V direct current voltage, and the reverse end of the clamp protection circuit is grounded.
Preferably, each belt scale is provided with a first weighing sensor, the discharge port of the screw conveyor is provided with a second weighing sensor for detecting the conveying amount of the stabilizing agent, and the water outlet of the water storage tank is provided with a vortex flowmeter. The first weighing sensor, the second weighing sensor and the vortex flowmeter are electrically connected with the control module through a PROFINET field bus.
Preferably, the control system further comprises a GPRS wireless communication module capable of remotely communicating with the mobile phone terminal, and the GPRS wireless communication module is electrically connected with the control module.
The invention has the beneficial effects that: 1. the control module is connected with the aggregate supply module, the stabilizer supply module, the clear water supply module and the HMI human-machine interface through the PROFINET field bus, so that 'one network to one end' can be realized, and the system connection is more convenient, simple, stable and reliable; 2. the communication speed and the response speed of the system are high, and the starting-up waste rate can be effectively reduced; 3. the control precision of the system is high, and the quality of stabilized soil can be improved; 4. the problem that the belt scale is easy to be blocked and skip the current fault can be overcome, and the starting current and the power of driving equipment are effectively reduced, so that the energy consumption is reduced, and the cost is saved; 5. the mobile phone remote monitoring can be realized, the field attendant is reduced, and the labor cost of system operation and maintenance is effectively reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic structural view of a stabilized soil mixing station;
FIG. 2 is a control system diagram of a stabilized soil mixing station in a first embodiment;
FIG. 3 is a control system diagram of a stabilized soil mixing station in a second embodiment;
FIG. 4 is a schematic diagram of a first detecting circuit;
the achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
The invention provides a control system of a stabilized soil mixing station.
Referring to fig. 1, fig. 1 is a schematic structural view of a stabilized soil mixing station.
As shown in fig. 1, the stabilized soil mixing station includes: aggregate supply module 1, stabilizer supply module 2, clear water supply module 3, mixer 4, inclined belt and finished product storage tank.
Wherein the aggregate comprises slag, lime, sand and cobble, the aggregate supply module 1 comprises four material hoppers 11, four belt scales 12, four first driving motors 13 and a flat belt 14. The four hoppers 11 are used for loading slag, lime, sand and stones, respectively. The four belt scales 12 are in one-to-one correspondence with the four batching hoppers 11, and each batching hopper 11 is respectively located below the discharge port of its corresponding batching hopper 11 and above the flat belt 14 to convey slag, lime, sand and stones onto the flat belt 14. A flat belt 14 is used to convey the aggregate to the mixer 4. Each first driving motor 13 is in one-to-one correspondence with the belt scale 12, and is respectively used for driving the belt scale 12 corresponding to the first driving motor to operate.
The stabilizer comprises cement powder, and the stabilizer supply module 2 comprises: a screw conveyor 21 and a second drive motor 22. The screw conveyor 21 is used for loading cement powder, and the discharge port thereof is located above the mixer 4. The second driving motor 22 is used to control the operation of the screw conveyor 21 to convey cement powder to the mixer 4.
The clean water supply module 3 is used for supplying clean water into the stirrer 4, and comprises a water storage tank 31 and a water pump 32. The water outlet of the water storage tank 31 is located above the mixer 4 so as to supply water into the mixer 4. The water pump 32 controls the amount of water supplied from the water tank 31 into the mixer 4.
The mixer 4 is used for mixing slag, lime, sand, stones, cement powder and clean water therein to form stabilized soil.
Stabilized soil mixed by the stirrer 4 can be conveyed into a finished product storage tank through an inclined belt, so that loading of a carrying truck is facilitated.
Referring to fig. 2, fig. 2 is a control system diagram of the stabilized soil mixing station of the first embodiment.
As shown in fig. 2, in the present embodiment, the control system of the stabilized soil mixing station further includes a control module 5 that controls the supply amounts of the aggregate supply module 1, the stabilizer supply module 2, the clear water supply module 3, and the HMI human-machine interface 6. The four first drive motors 13, the second drive motor 22 and the water pump 32 are all electrically connected with the control module 5 through a PROFINET fieldbus. The HMI human-computer interface 6 is electrically connected with the control module 5 through a PROFINET field bus, so that field personnel can conveniently monitor and control the control running state of the stabilized soil mixing station in real time.
As shown in fig. 2, in order to control the proportions of slag, lime, sand and stones in the stabilized soil, each belt scale 12 is provided with a first load cell 151, which first load cell 151 is electrically connected to the control module 5 via a PROFINET fieldbus. In this embodiment, the weights of slag, lime, sand and stone on each belt scale 12 are respectively transferred to the control module 5 through the first weighing sensor 151 and simultaneously displayed in the HMI human-machine interface 6, so that the on-site staff can control the conveying speed of the belt scale 12 in real time, and further control the weights of slag, lime, sand and stone conveyed to the mixer 4, namely the weights of aggregate, thereby controlling the proportion of aggregate in stabilized soil. Similarly, a second weighing sensor 231 for detecting the conveying amount of the stabilizing agent is arranged at the discharge port of the screw conveyor 21, a vortex flowmeter 33 is arranged at the water outlet of the water storage tank 31, and the second weighing sensor 231 and the vortex flowmeter 33 are connected with the control module 5 through a PROFINET field bus. Thus, the proportion of the stabilizer and the clear water in the stabilized soil is controlled by the second load cell 231 and the vortex flowmeter 33.
According to the technical scheme, a PROFINET field bus is adopted to connect the control module 5 with the aggregate supply module 1, the stabilizer supply module 2, the clear water supply module 3 and the HMI human-computer interface 6 to form a real-time industrial Ethernet communication network, so that the supply quantity of aggregate, the stabilizer and clear water is controlled accurately in real time through the HMI human-computer interface 6. Compared with the prior art, the invention adopts PROFINE IRT real-time industrial Ethernet communication, the communication speed can reach 100Mbps, and the bus cycle time can be reduced to 250us. Compared with the traditional MODBUS communication mode, the communication speed is faster, the response time is shorter, and the starting-up waste rate can be effectively reduced. Meanwhile, the control precision (namely the maximum deviation rate of the stabilized soil ingredient formula) of the communication mode of PROFINE IRT can reach 0.4%, the control precision is higher, the quality of stabilized soil can be greatly improved, and the quality of a construction road is further improved.
In order to avoid the belt scale 12 from being locked or blocked, a first driving unit 16 is preferably disposed between each first driving motor 13 and the control module 5, and is used for controlling the first driving motor 13 to start in forward and reverse rotation. Because the belt scale 12 is usually blocked or blocked due to the uneven distribution of the materials on the belt when in operation, the first driving unit 16 controls the first driving motor 13 to start in forward and reverse rotation, so as to avoid the blocking or blocking of the belt scale 12 caused by the transportation of the aggregate on the belt scale 12 to the same side. Similarly, a second driving unit 24 is arranged between the second driving motor 22 and the control module 5, and the second driving unit 24 is connected with the control module 5 through a PROFINET field bus and controls the second driving motor 22 to start in a forward and reverse rotation manner so as to avoid blockage of a discharge hole of the screw conveyor 21. In addition, in the embodiment, the first driving unit 16 controls the first driving motor 13 to perform forward and reverse rotation starting with increasing frequency, so that the starting current is small, overcurrent faults of the belt scale 12 can be avoided, the starting current and the power of driving equipment can be effectively reduced, the energy consumption is reduced, and the cost is saved.
In order to control the energy consumption of the stabilized soil mixing station, the first drive motor 13 and the second drive motor 22 are preferably permanent magnet synchronous motors. The traditional stabilized soil mixing stations are all driven by adopting asynchronous motors, and because the starting current of the asynchronous motors is large, a certain margin is generally reserved during system design, so that the selected asynchronous motors adopted by the stabilized soil mixing stations are large, and the stabilized soil mixing stations are basically in a half-load working state. When the asynchronous motor is in a light load state, the running efficiency and the power factor are low, and the energy efficiency is poor. In the embodiment, the permanent magnet synchronous motor without the speed sensor is adopted, so that the starting rotation is huge, the overload capacity is strong, the speed stabilization precision is high, and the energy consumption of the stabilized soil mixing station can be effectively saved.
In order to realize the remote control of the stabilized soil mixing station, the control system preferably further comprises a GPRS wireless communication module 7 which can be remotely communicated with the mobile phone terminal, and the GPRS wireless communication module 7 is electrically connected with the control module 5. By configuring the GPRS wireless communication module 7, the remote monitoring function of the mobile phone is realized, for example: remote start-stop machine, encryption and decryption, recipe parameter modification, running state and fault information monitoring and the like, and the power-assisted stabilized soil mixing station advances to an intelligent factory with 'unattended operation and less attended'.
Referring to fig. 3, fig. 3 is a control system diagram of a stabilized soil mixing station according to a second embodiment.
As shown in fig. 3, in the present embodiment, a first detection circuit 152 for detecting the phase current of the first driving motor 13 is provided in the first driving unit 16, the detection end of which is electrically connected to the output end of the first driving motor 13, and the output end of which is electrically connected to the control module 5. Similarly, the second driving unit 24 is provided therein with a second detecting circuit 232 for detecting the phase current of the second driving motor 22, and the second detecting circuit 232 is similar to the first electrical measuring circuit 152 in structure and principle, and in this embodiment, the structure and principle of the first detecting circuit are described as an example.
As shown in fig. 4, the first detection circuit 152 includes: sampling resistor R9, isolation amplifier U1 and operational amplifier U2. The first end of the sampling resistor R9 is connected to the phase current output end of the first driving motor 13, and is connected to the vin+ end of the isolation amplifier U1 through a resistor R6. The second end of the sampling resistor R9 is connected to the PE end of the first driving motor 13 and to the GND end and VIN end of the isolation amplifier U1. In this embodiment, the sampling resistor R9 is a mΩ -level sampling resistor R9 to ensure accuracy of current sampling. The OUT+ end of the isolation amplifier U1 is connected with the inverting output end of the operational amplifier U2 through a resistor R1, and the OUT-end of the isolation amplifier U1 is connected with the non-inverting input end of the operational amplifier U2 through a resistor R3. The inverting input end of the operational amplifier U2 is connected with the output end thereof through a parallel circuit formed by R2 and C6, and the inverting input end thereof is connected with the non-inverting input end thereof through a capacitor C5. The non-inverting input terminal of the operational amplifier U2 is grounded through a parallel circuit formed by a resistor R4 and a capacitor C4. The output of the operational amplifier U2 is connected to a first end of a resistor R7. The second end of the resistor R7 is connected to the control module 5 as an output end of the first detection circuit 152, and is connected to the +3.3v dc voltage through the resistor R8 and is grounded through the capacitor C7.
In this embodiment, the resistance of the resistor R1 is equal to the resistance of the resistor R3, and the resistance of the resistor R2 is equal to the resistance of the resistor R4. Therefore, the operational amplifier U2The magnification of (c) can be expressed as (V out- -V out+ ) R2/R1, wherein V out+ To isolate the voltage output from the OUT+ end of the amplifier, V out- To isolate the voltage at the OUT-terminal of the amplifier. Thus, the amplification factor of the operational amplifier U2 can be adjusted by adjusting the resistance value of R2.
The first detection circuit 152 operates on the principle that: when the phase current of the first drive motor 13 passes through the sampling resistor R9, a voltage drop is generated, and the phase current signal of the first drive motor 13 is converted into a mV-level voltage signal. The mV voltage signal is sent to an isolation amplifier U1, amplified to V by the isolation amplifier U1, output to an operational amplifier U2, and secondarily amplified by the operational amplifier U2. The voltage signal amplified by the operational amplifier U2 is overlapped with the 3.3V voltage signal through the resistor R7, so that the voltage signal becomes a voltage signal with a stable voltage value, and the detection is convenient. Finally, the control module 5 derives the current value of the first driving motor 13 from the sampled voltage signal.
In the present embodiment, the phase current of the first drive motor 13 detected by the first detection circuit 152, and the output voltage of the first drive motor 13 is the command value set by the first drive unit 16, whereby the power P of the first drive motor 13 can be calculated. The torque T of the first drive motor 13 can be determined by using the torque formula t=p/n, where n is the rotational speed of the first drive motor 13. Thus, the weight of the aggregate on the belt scale 12 can be directly sensed by the torque T without the first load cell 151 to detect the weight of the aggregate on the belt scale 12. Compared with the mode of controlling the operation of the belt scale 12 by sensing the weight of the aggregate through the first detection circuit 152 through the first weighing sensor 151, the belt scale has the advantages of higher response speed, higher control precision, lower control cost and better stability.
In addition, in the embodiment, the first detection circuit 152 further includes a clamp protection circuit formed by antiparallel connection of two diodes D2, whose common terminal is connected to the second terminal of the resistor R7, whose forward terminal is connected to the 3.3V dc voltage, and whose reverse terminal is connected to ground. By providing a clamp protection circuit, the voltage output from the first detection circuit 152 is clamped, thereby preventing the output voltage from being too high or too low, and protecting the circuit output.
The foregoing description of the preferred embodiments of the present invention should not be construed as limiting the scope of the invention, but rather should be understood to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the following description and drawings or any application directly or indirectly to other relevant art(s).
Claims (5)
1. A control system for a stabilized soil mixing station, comprising: the system comprises an aggregate supply module, a stabilizer supply module, a clear water supply module, a stirrer, a control module for controlling the supply amounts of the aggregate supply module, the stabilizer supply module and the clear water supply module, and an HMI human-machine interface;
the aggregate supply module includes: the conveyor belt conveyor comprises a plurality of batching hoppers for loading aggregate, wherein a belt scale is arranged below a discharge hole of each batching hopper; the first driving motors are matched with each belt balance one by one; and a flat belt for conveying aggregate to the mixer, each belt scale being located above the flat belt;
the stabilizer supply module includes: a screw conveyor for loading a stabilizer and a second driving motor for controlling the operation of the screw conveyor;
the clean water supply module includes: a water storage tank positioned above the stirrer, and a water pump for controlling the water storage tank to supply water to the stirrer;
each first driving motor, each second driving motor and each water pump are electrically connected with the control module through a PROFINET field bus; the HMI human-machine interface is electrically connected with the control module through the PROFINET field bus;
each first driving motor and each control module are respectively provided with a first driving unit for controlling the forward and reverse rotation starting of the first driving motor; a second driving unit for controlling the forward and reverse rotation starting of the second driving motor is arranged between the second driving motor and the control module;
a first detection circuit for detecting the phase current of the first driving motor is arranged in the first driving unit, the detection end of the first detection circuit is electrically connected with the output end of the first driving motor, and the output end of the first detection circuit is electrically connected with the control module;
the first detection circuit includes: sampling resistor R9, isolation amplifier U1 and operational amplifier U2;
the first end of the sampling resistor R9 is connected with the phase current output end of the first driving motor and is connected with the VIN+ end of the isolation amplifier through a resistor R6; the second end of the sampling resistor R9 is connected with the PE end of the first driving motor and connected with the GND end and the VIN end of the isolation amplifier;
the OUT+ end of the isolation amplifier is connected with the inverting output end of the operational amplifier U2 through a resistor R1, and the OUT-end of the isolation amplifier is connected with the non-inverting input end of the operational amplifier U2 through a resistor R3;
the inverting input end of the operational amplifier U2 is connected with the output end of the operational amplifier U through a parallel circuit formed by R2 and C6, and the inverting input end of the operational amplifier U2 is connected with the non-inverting input end of the operational amplifier U through a capacitor C5; the non-inverting input end of the operational amplifier U2 is grounded through a parallel circuit formed by a resistor R4 and a capacitor C4; the output end of the operational amplifier U2 is connected with the first end of the resistor R7; the second end of the resistor R7 is used as the output end of the first detection circuit, is connected with the control module, is connected with 3.3V direct-current voltage through the resistor R8, and is grounded through the capacitor C7;
the phase current of the first driving motor detected by the first detection circuit, and the output voltage of the first driving motor is the instruction value set by the first driving unit, so that the power P of the first driving motor can be calculated; using a torque formula t=p/n, where n is the rotational speed of the first drive motor, such that the torque T of the first drive motor can be determined; thus, the weight of the aggregate on the belt scale can be directly sensed by the torque T.
2. The stabilized soil mixing station control system of claim 1, wherein the first drive motor and the second drive motor are permanent magnet synchronous motors.
3. The control system of the stabilized soil mixing station as claimed in claim 1, wherein the first detection circuit further comprises a clamp protection circuit formed by two diodes D2 connected in anti-parallel, the common terminal of the clamp protection circuit is connected with the second terminal of the resistor R7, the positive terminal of the clamp protection circuit is connected with a direct current voltage of 3.3V, and the reverse terminal of the clamp protection circuit is grounded.
4. The control system of the stabilized soil mixing station as claimed in claim 1, wherein a first weighing sensor is arranged on each belt scale, a second weighing sensor for detecting the conveying amount of the stabilizing agent is arranged at a discharge port of the screw conveyor, and a vortex flowmeter is arranged at a water outlet of the water storage tank; the first weighing sensor, the second weighing sensor and the vortex flowmeter are all electrically connected with the control module through a PROFINET field bus.
5. The stabilized soil mixing station control system as claimed in any one of claims 1 to 4, further comprising a GPRS wireless communication module capable of remotely communicating with a mobile phone terminal, wherein the GPRS wireless communication module is electrically connected with the control module.
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