CN113624554B - Cement stable sampling device and method - Google Patents
Cement stable sampling device and method Download PDFInfo
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- CN113624554B CN113624554B CN202110974722.7A CN202110974722A CN113624554B CN 113624554 B CN113624554 B CN 113624554B CN 202110974722 A CN202110974722 A CN 202110974722A CN 113624554 B CN113624554 B CN 113624554B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/10—Devices for withdrawing samples in the liquid or fluent state
- G01N1/14—Suction devices, e.g. pumps; Ejector devices
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
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Abstract
The invention relates to the field of industrial equipment and discloses a cement stable sampling device and a cement stable sampling method, wherein the sampling device comprises a sampling execution system, a sampling control system and a distributed control system, the sampling execution system is responsible for completing specific blanking or sampling actions, control parameters of blanking and sampling processes can be set in the sampling control system, the air pressure and the weight of a sample in the sampling process are monitored, and specific control instructions are sent to the sampling execution system; the distributed control system supports remote setting of blanking and sampling parameters, monitors blanking and sampling processes, and by the sampling method, operators can set and adjust the blanking parameters on site or in a central control room, real-time monitor the blanking and sampling processes, automatically execute blanking and sampling actions and reduce the labor intensity of the operators.
Description
Technical Field
The invention relates to the field of industrial equipment, in particular to a cement stable sampling device and method.
Background
Cement is used as an important cementing material, is widely applied to projects such as buildings, bridges, water conservancy projects and the like, and has important value on the reliability and stability of the quality. When an enterprise produces cement, laboratory operators usually take samples of the cement put in storage every other hour, and detect the specific surface area, the screen residue, the CaO content and the SO content of the cement 3 Content, etc., and informs the central office operator of the detection result. And the operator of the central control room compares the difference between the detection result and the cement quality standard, and adjusts the current process control parameters of cement production in the distributed control system, so that closed-loop control is completed, and the quality control of cement produced at the next moment is ensured to be within the standard range. Therefore, the warehouse-in cement sample taken by the laboratory staff must have strong representativeness, and the actual quality of the cement finished product produced at the current moment can be reflected. If the sample of cement is not representative, the sample test index is inaccurate, so that the operator of the central control room is influenced to adjust the control parameters, and the quality of cement produced at the next moment is finally not up to standard or stable.
The sampling equipment used by laboratory testers of traditional cement enterprises for taking warehouse-in cement samples mainly comprises an electric control box, a motor, a sleeve, a spiral reamer, a blanking hose, a charging barrel and an upper end cover. The tester sets the blanking frequency in the time relay of the electric control box, and the electric control box controls the motor to periodically rotate forwards and reversely according to the set frequency. One end of the motor is fixedly connected with a spiral reamer, the spiral reamer is placed in the sleeve, and the sleeve is buried in a blanking chute of the cement warehouse-in elevator. When the spiral reamer rotates along with the motor in the forward direction, cement in the sleeve is reamed out by the spiral reamer, and a cement sample cannot enter the charging barrel; when the spiral reamer rotates reversely along with the motor, cement in the sleeve is reamed in by the spiral reamer, and the reamed cement falls into the charging barrel along the discharging hose to finish one-time discharging.
The traditional cement sampling mode has the following defects: the cement sample amount in the charging barrel is controlled by setting a time relay to control the reverse rotation time of the spiral reamer. The amount of cement sample falling into the charging barrel is influenced by the time of reversing the spiral reamer, the flow stability of the material layer in the discharging chute and the magnitude of negative pressure of gas between the discharging chute and the charging barrel. The fluidity of the material layer in the blanking chute is not stable and unchanged under the influence of various factors, so that the amount of cement materials reamed by the spiral reamer is changed within the same time; in addition, if the rotational speed of the dust collection fan is changed greatly, or the feed cylinder and the upper end cover are not pressed tightly due to negligence when laboratory staff samples, the negative pressure of gas between the blanking chute and the feed cylinder is unstable, the large negative pressure can cause fine particles in a cement sample to be pumped away, the sample material quantity is unstable, and the obtained cement sample is not representative.
Disclosure of Invention
In order to solve the technical problems, the invention provides the cement stable sampling device and the cement stable sampling method, which have the advantages of high automation degree in the whole sampling process, convenient adjustment and simplified operation of operators; the process of unloading and sampling can real-time supervision and backtrack, and the cement sample material volume of taking out is stable, and the representativeness is stronger.
In order to solve the technical problems, the invention adopts the following technical scheme:
a cement stable sampling device comprises a sampling execution system, a sampling control system and a distributed control system; the sample execution system includes:
a cement transport pipe;
the dust collection fan is connected with the cement conveying pipeline through an air path pipeline;
the sleeve is provided with two material holes communicated with the cement conveying pipeline; one of the material holes faces the cement movement direction in the cement conveying pipeline and is used for sucking cement; the other material hole is perpendicular to the cement movement direction and is used for discharging cement; a spiral reamer capable of rotating along the axis of the sleeve is arranged in the sleeve; when the spiral reamer rotates forwards, cement contained in the sleeve is hinged into a cement conveying pipeline, and when the spiral reamer rotates reversely, cement in the sleeve is hinged into a blanking hose for blanking;
the upper end cover is horizontally and fixedly arranged and positioned at the lower part of the sleeve, and the bottom surface of the upper end cover is provided with an air pressure sensor;
one end of the blanking hose is communicated with the sleeve, and the other end of the blanking hose penetrates through the upper end cover;
the charging barrel is positioned at the lower part of the upper end cover and can be lifted, and a weighing sensor for weighing the weight of the cement sample is arranged in the charging barrel; when the charging barrel is lifted for discharging, the charging barrel is propped against the upper end cover to form a closed accommodating space for accommodating the cement sample, and the air pressure sensor is positioned in the accommodating space;
the sampling control system and the dispersion control system can set blanking and sampling control parameters, send blanking and sampling control instructions to the sampling execution system, control the charging barrel to lift for sampling, control the rotation of the spiral reamer for blanking, and read measurement values of the air pressure sensor and the weighing sensor in real time to realize stable blanking and sampling of cement samples; the sampling control system is close to the sampling execution system, and the distributed control system is far away from the sampling execution system.
Further, the sampling execution system comprises a frame fixedly arranged, a second motor fixedly connected with the frame, a vertically arranged screw rod, a second coupler for connecting the screw rod with a rotating end of the second motor, a supporting platform fixedly connected with a moving end of the screw rod, a fixedly arranged first motor and a first coupler for connecting the moving end of the first motor with a spiral reamer; the charging barrel comprises an outer barrel fixedly mounted on a supporting platform, an inner barrel which is positioned in the outer barrel and hung on the upper end edge of the outer barrel, a flexible bag hung at the lower end of the inner barrel, and an inner barrel supporting plate which supports the flexible bag and is pressed on the weighing sensor.
Further, the sampling control system includes:
the controller is used for sending a control instruction to the sampling execution system;
the man-machine interaction module is in signal connection with the controller and is used for setting blanking and sampling control parameters by an operator and checking execution states in the blanking and sampling processes;
the input/output module is used for connecting the controller with the sampling execution system, reading signals from the air pressure sensor and the weighing sensor, forwarding control instructions of the controller and driving the first motor and the second motor to execute actions;
and the communication module is used for enabling the controller to be communicated with a remote distributed control system so as to realize bidirectional communication.
Further, the distributed control system includes:
a gateway for establishing communication between the sampling control system and the operator station, engineer station, host device;
an operator station including a computer host used by a central office operator; the central control room operator can check the operation parameters of the host equipment on the operator station and send a control instruction to the sampling execution system;
the engineer station comprises a computer host, has the same function as the operator station and can edit the distributed control system program and update the distributed control system program into the operator station;
the host equipment comprises all process equipment connected to the distributed control system.
A sampling method of a cement stabilized sampling device, comprising the steps of:
setting an operation mode: an operator selects an operation mode as a near-end mode or a far-end mode in the man-machine interaction module; the near-end mode directly controls the sampling execution system to execute the feeding and sampling actions through the sampling control system, and the far-end mode indirectly controls the sampling execution system to execute the feeding and sampling actions through the distributed control system; in the process of executing the blanking and sampling actions, the control parameters and the execution states of the blanking and sampling actions, and real-time measurement values of the weighing sensor and the air pressure sensor are synchronized into the man-machine interaction module and the operator station;
setting a blanking control parameter, and starting a blanking task: when the near-end mode is selected, setting the total blanking weight, the single blanking weight, the blanking frequency and the blanking air pressure interval in a man-machine interaction module by an operator, and starting a blanking task; when the remote mode is selected, setting the total weight, the single blanking weight, the blanking frequency and the blanking air pressure interval of blanking in an operator station by an operator, and starting a blanking task; the blanking task and the blanking action are different in that the blanking action is to periodically execute the blanking task, and when the blanking task is started, the blanking action is periodically executed; when the blanking task is terminated, the blanking action stops executing;
compacting the charging barrel: if the feeding is performed for the first time, or before the feeding is performed again after the last sampling is performed, the controller drives the second motor to rotate reversely, the screw rod rotates the supporting platform to move upwards, and the upper end of the charging barrel is tightly pressed with the upper end cover;
and (3) executing the following actions: the controller monitors the air pressure in the charging barrel through the air pressure sensor, and when the detected air pressure is in the blanking air pressure interval, the controller drives the first motor to periodically rotate forwards and reversely according to the set blanking frequency, so as to drive the spiral reamer to periodically rotate forwards and reversely; when the spiral reamer rotates positively, cement in the sleeve is reamed out into the cement conveying pipeline; when the spiral reamer rotates reversely, cement in the sleeve is reamed in and is discharged into the charging barrel;
performing a sampling action: when the weight of the cement sample in the charging barrel reaches the total discharging weight, if a near-end mode is selected, an operator sends out a sampling control instruction through a man-machine interaction module; if a remote mode is selected, an operator sends a sampling control instruction through an operator station, the controller drives the second motor to rotate forward, the screw rod rotates to drive the supporting platform to move downwards, the charging barrel is separated from contact with the upper end cover, and the operator takes away a cement sample in the charging barrel;
and (5) finishing the blanking task: when the enterprise stops production and does not need sampling, if a near-end mode is selected, an operator finishes a blanking task in the man-machine interaction module; if the remote mode is selected, the operator ends the blanking task in the operator station.
Specifically, when one of the operation modes is selected, the other operation mode is automatically disabled unless the operation mode is reset after the blanking task is finished.
Specifically, after the blanking action is executed, if the weight of the cement sample in the charging barrel does not reach the total blanking weight, but an operator needs to finish the blanking action in advance, the sampling action is executed.
Specifically, when the air pressure in the charging barrel is detected not to be in the blanking air pressure interval, the sampling execution system does not execute blanking action, and an air pressure abnormality alarm is sent out in the man-machine interaction module and the operator station.
Specifically, when the blanking action is executed, the controller reads the numerical value of the weighing sensor in real time, and the weight of the cement sample in the charging barrel is obtained; if the weight of the cement in the charging barrel is greater than or equal to the set total discharging weight, the controller controls the sampling execution system to stop discharging the cement into the charging barrel.
Compared with the prior art, the invention has the beneficial technical effects that:
1. sample representativeness is ensured. Traditional sampling mode is influenced by the rotational speed of a dust collection fan, negative pressure between a charging barrel and a cement conveying pipeline is unstable, when the negative pressure is large, fine particles in cement are pumped away, the obtained cement sample is thicker, and sampling representativeness is influenced. According to the invention, the air pressure in the charging barrel is measured through the air pressure sensor, and the sampling control system can drive the sampling execution system to act only when the air pressure in the charging barrel is in a set blanking air pressure interval, so that the representativeness of a cement sample is ensured.
2. The weight stability of the sample is ensured. The traditional blanking mode is to control the weight of a blanking sample by setting a time relay and controlling the time for driving the spiral reamer to rotate forwards or reversely by a motor. Because the sampling time is fixed, when the cement flow in the cement conveying pipeline is unstable, the weight of the cement sample in the feeding barrel hinged by the spiral reamer is also unstable. If the obtained samples are too many, the redundant cement samples are discarded, and resources are wasted. If too little cement sample is taken, an effective test cannot be performed. According to the invention, the weighing sensor is used for directly measuring the weight of the measured cement sample, so that the discharging process is controlled, the total weight of the sample can be accurately controlled, the sufficient test of the measured cement sample is ensured, meanwhile, the resource waste is not caused, and the method is more economical and practical.
3. The blanking and sampling processes are monitored in real time, and the history can be traced. The traditional sampling mode can not monitor and record the accurate time of blanking and sampling, the air pressure in the blanking process and the single blanking weight in real time. The sampling device and the sampling method can monitor the air pressure in the sampling charging barrel in real time, can give an alarm in time to remind an operator when the negative pressure is found abnormal, and can adjust the rotating speed of the dust collection fan to enable the dust collection fan to return to a normal state; when the sampled motor fails or the single blanking quantity is abnormal, the problems can be found and checked in the man-machine interaction module or the operator station in time, and the influence of the sampling problem on production is reduced. The time and the material quantity of each sampling are recorded, so that the cement production process can be traced conveniently, and a basis is provided for the enterprise to implement quality control.
4. The blanking and sampling processes are completed fully automatically, so that the reliability is high, and the workload of operators is reduced. The traditional blanking parameters need to be set on an electric control box on the production site and cannot be set remotely. During blanking, operators can not guarantee to put the charging barrel at the correct position and compress the charging barrel every time, so that the air pressure in the charging barrel is unstable, and the sampling representativeness is poor. The sampling device and the sampling method can control the blanking and sampling in the field, can remotely monitor and control the blanking and sampling process in an operator station, and do not need to go to the field operation by operators. The automatic pressure measuring device does not need an operator to manually press and loosen the charging barrel, is automatically completed by a machine, can effectively ensure that the air pressure in the charging barrel is not interfered by human factors, improves the sampling stability and representativeness, and reduces the labor intensity of the operator.
Drawings
FIG. 1 is a schematic diagram of a sampling device according to the present invention;
FIG. 2 is a flow chart of the sampling method of the present invention.
Detailed Description
A preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.
As shown in fig. 1, a cement stabilized sampling device includes a sampling execution system 100, a sampling control system 200, and a distributed control system 300; the sampling execution system 100 is responsible for receiving the control instruction of the sampling control system 200 and completing specific blanking and sampling actions. Control parameters of the blanking and sampling process can be set in the sampling control system 200, the air pressure in the sampling process and the weight of cement in the charging barrel are monitored in real time, and specific control instructions are sent to the sampling execution system 100; the distributed control system 300 supports remote setting of blanking and sampling control parameters, and monitors the blanking and sampling processes in real time; the sampling control system 200 and the sampling execution system 100 are placed beside the equipment in the production site, which is called the near end; the distributed control system is located in a central control room, called the remote end.
The sample execution system 100 specifically includes the following:
the dust collection fan 101 is used for pulling cement in the cement conveying pipeline 102 to flow at a constant speed in a certain direction, so that the negative pressure in the cement conveying pipeline and the stability of cement in flowing can be influenced;
the cement conveying pipeline 102 is a carrier for cement conveying, and cement flows in the cement conveying pipeline 102 at a constant speed under ideal conditions; the pressure in the whole pipeline is smaller than the atmospheric pressure, namely negative pressure, and the pipeline is used for preventing cement from being sprayed out from a gap or an interface of the pipeline;
a sleeve 103 for encasing the helical reamer 104; the front end of the sleeve 103 is buried in the cement conveying pipeline 102, and two material holes are formed in the sleeve and are used for sucking and discharging cement in the cement conveying pipeline 102 respectively;
a screw reamer 104 which, when rotated forward, reams the cement contained in the sleeve 103 out into the cement transporting pipe 102, and when rotated backward, reams the cement contained in the sleeve 103 into the blanking hose 107;
a first coupling 105 for coupling the helical reamer 104 and the first motor 106;
the first motor 106 is used for driving the spiral reamer 104 to rotate forward or reversely, and the forward rotation and reverse rotation actions of the first motor are controlled by the sampling control system 200;
the blanking hose 107 is a flexible hose, one end of the blanking hose is fixedly connected to the sleeve 103, the other end of the blanking hose is fixedly connected to the upper end cover 108, and a cement sample hinged by the spiral reamer 104 flows through the middle of the blanking hose 107;
an upper end cap 108 for pressing against the upper portion of the inner barrel 110. The inner cylinder 110 is required to be isolated from the atmosphere during blanking, so that the internal pressure is ensured to be stable negative pressure, and therefore, the bottom surface of the upper end cover 108, which is in contact with the inner cylinder 110, is covered with a layer of flexible sponge, so that the upper end cover 108 and the inner cylinder 110 are ensured to be tightly pressed;
the air pressure sensor 109 is used for monitoring the air pressure in the inner cylinder 110 during blanking;
an inner barrel 110 for storing the cement sample into which the helical reamer 104 is hinged. The upper end of the inner cylinder 110 is non-deformable and is hung on the outer cylinder 111 to fix the position of the outer cylinder 110, and meanwhile, the inner cylinder is convenient for an operator to take out; the lower end of the inner cylinder 110 is a flexible wear-resistant bag, and is fixedly connected to the upper end of the inner cylinder 110. The flexible bag at the lower end of the inner cylinder 110 is in contact with the inner cylinder support plate 112;
an outer cylinder 111 for supporting and fixing the inner cylinder 110, placing the inner cylinder support plate 112 and the load cell 113;
an inner cylinder support plate 112 above the weighing sensor 113 for supporting the flexible bag at the lower end of the inner cylinder 110;
a weighing sensor 113 for measuring the weight of the cement sample in the flexible bag at the lower end of the inner cylinder 110, the measured weight being free of the weight of the inner cylinder 110 and the inner cylinder support plate 112;
a support platform 114 for supporting the outer cylinder 111. The upper end of the supporting platform 114 is fixedly connected with the bottom of the outer cylinder 111. The supporting platform 114 is fixedly connected with the balls 118, and the balls 118 can drive the supporting platform 114 to move so as to drive the outer cylinder 111 to move together. During blanking, the supporting platform 114 moves upwards to enable the inner cylinder 110 to be tightly pressed with the upper end cover 108; during sampling, the support platform 114 moves downwards so as to facilitate the operator to take out the cement sample in the inner cylinder 110;
the second motor 115 is used for driving the screw 117 to rotate and driving the balls 118 to move up and down, so as to drive the supporting platform 114 to move up and down;
a second coupling 116 for connecting an output shaft of the second motor 115 and a screw 117;
the screw 117 and the balls 118 form a ball screw pair, the screw 117 rotates positively and negatively, and the balls 118 move up and down; the ball is the moving end of the screw.
The frame 119 is fixed on the production site and is not movable.
The sampling control system 200 includes:
the controller 201 is a physical carrier for controlling logic operation, and can adopt an industrial personal computer or a microcontroller, etc., and is preferably a PLC controller in consideration of the stability requirement of operation in an industrial field;
the man-machine interaction module 202 is used for setting and checking related parameters of blanking and sampling by an operator, preferably an industrial touch screen, and is matched with the PLC for use; the controller 201 and the man-machine interaction module 202 on the hardware can adopt various communication modes such as RS485, RS422, ethernet and the like, and the embodiment prefers the Ethernet communication;
the input/output module 203 is an interface between the controller 201 and the peripheral device, and is configured to read measurement values from the air pressure sensor 109 and the weighing sensor 113, receive a control instruction of the controller 201, and drive the first motor 106 and the second motor 115 to perform actions; the input/output module 203 is preferably an IO module adapted to the PLC controller;
the communication module 204 is configured to connect the controller 201 with the remote distributed control system 300 in a signal manner, so as to implement bidirectional communication; the communication module 204 and the controller 201 and the gateway 301 can be connected by using ethernet; the communication module 204 is preferably an ethernet communication component that is adapted to the PLC controller.
The distributed control system 300 is also called DCS (Distributed Control System) system, and is a core system for cement enterprises to control production equipment and regulate production processes.
The distributed control system 300 includes:
a gateway 301 for establishing an ethernet connection with the communication module 204, the operator station 302, the engineer station 303, and the host device 304;
an operator station 302 whose physical entity is the host computer used by the central office operator; a central control room operator checks the operating parameters of the host device 304 at the operator station 302 to control and regulate the cement production process;
the engineer station 303, the physical entity of which is also a computer host; engineer station 303 is functionally identical to operator station 302, but has one more function to edit the distributed control system program and update it to operator station 302, typically not used for shutdown;
the host equipment 304 comprises all process equipment connected to a distributed control system, such as a roller press, a ball mill, a powder concentrator, a dust collector and the like.
As shown in fig. 2, a cement stable sampling method comprises the following steps:
s100: an operation mode is set. The operator selects the operation mode as the near-end mode or the far-end mode in the man-machine interaction module 202. The near-end mode refers to directly controlling the sampling execution system 100 to execute the feeding and sampling actions by the sampling control system 200. The far-end mode refers to indirectly controlling the sampling execution system 100 to execute the feeding and sampling actions through the distributed control system 300. Once one of the modes of operation is selected, the other mode of operation automatically fails unless the mode of operation is reset in the human-machine interaction module 202 after the end of the present blanking task. In the process of executing the blanking and sampling actions, the data of the blanking, the setting parameters of the sampling actions, the execution state of the actions, the real-time measurement values of the sensors and the like are synchronized into the man-machine interaction module 202 and the operator station 302. The blanking task and the blanking action are different in that the blanking action periodically executes the blanking task: and starting the blanking task, and periodically executing the blanking action. The blanking task is terminated, and the blanking action is stopped;
s200: setting a blanking control parameter and starting a blanking task. When the near-end mode is selected in S100, the operator sets parameters such as the total weight of the blanking, the weight of the single blanking, the frequency of the blanking, the blanking air pressure interval, etc. in the man-machine interaction module 202, and clicks the start blanking task button. When the remote mode is selected in S100, the operator sets parameters such as total blanking weight, single blanking weight, blanking frequency, blanking air pressure interval, etc. in the operator station 302, and clicks the start blanking task button.
S300: a sampling action is performed. When the weight of the cement sample in the inner barrel 110 has reached the set total blanking weight in S200, or the operator needs to end the blanking action in advance, a manual sampling button is clicked in the man-machine interaction module 202 or the operator station 302 according to whether the setting in S100 is the near-end mode or the far-end mode. The controller 201 drives the second motor 115 to rotate forward, the screw 117 rotates to drive the ball 118 to move downwards, the sampling support platform 114 fixedly connected with the ball 118 also moves downwards, the inner cylinder 110 is out of contact with the upper end cover 108, and a cement sample in the inner cylinder 110 waits to be taken by an operator; when the weight of the cement sample in the inner cylinder 110 does not reach the set total blanking weight of S200, and the operator does not need to finish the blanking action in advance, continuing to execute the following steps;
s400: the charging barrel is tightly pressed. If the first discharging action is performed or the last sampling action is performed and a new discharging action period is started, the controller 201 firstly drives the second motor 115 to rotate reversely, the screw 117 rotates to drive the ball 118 to move upwards, the supporting platform 114 fixedly connected with the ball 118 also moves upwards, and the upper end of the inner cylinder 110 is pressed with the upper end cover 108; if a blanking action of the current cycle is being performed, it is indicated that the inner barrel 110 has been compressed with the upper end cap 108.
S500: and executing a blanking action. The controller 201 reads the measurement value of the air pressure sensor 109. When the detected air pressure is within the blanking air pressure interval set in S200, the controller 201 drives the first motor 106 to periodically rotate forward and backward according to the blanking frequency set in S200, and further the spiral reamer 104 is also driven to periodically rotate forward and backward. When the screw reamer 104 is rotated in the forward direction, the cement in the sleeve 103 is reamed back into the cement delivery pipe 102. When the screw reamer 104 is reversed, cement in the sleeve 103 is reamed, flows along the sleeve 103 to the blanking hose 107, and falls into a flexible bag at the lower end of the inner barrel 110. During blanking, the controller 201 reads the measurement value of the weighing sensor 113 in real time, and obtains the weight of the cement sample taken in the inner barrel 110. If the weight of the taken cement sample is greater than or equal to the total weight of the blanking set in S200, then the controller 201 does not drive the sampling execution system 100 to perform blanking into the inner cylinder 110; when the detected air pressure is not within the blanking air pressure interval set in S200, the controller 201 does not drive the sampling execution system 100 to execute the blanking operation.
Wherein S300, S400 and S500 are circularly performed in one blanking task, and continuously measuring whether the weight of the cement sample in the charging barrel reaches the set total blanking weight or not through S300.
S600: and finishing the blanking task. When the enterprise is stopped and sampling is not needed, a blanking task ending button is clicked in the man-machine interaction module 202 or the operator station 302 according to whether the near-end mode or the far-end mode is set in the S100, and the whole blanking process is ended.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a single embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to specific embodiments, and that the embodiments may be combined appropriately to form other embodiments that will be understood by those skilled in the art.
Claims (8)
1. The cement stable sampling device is characterized by comprising a sampling execution system, a sampling control system and a distributed control system; the sample execution system includes:
a cement transport pipe;
the dust collection fan is connected with the cement conveying pipeline through an air path pipeline;
the sleeve is provided with two material holes communicated with the cement conveying pipeline; one of the material holes faces the cement movement direction in the cement conveying pipeline and is used for sucking cement; the other material hole is perpendicular to the cement movement direction and is used for discharging cement; a spiral reamer capable of rotating along the axis of the sleeve is arranged in the sleeve; when the spiral reamer rotates forwards, cement contained in the sleeve is hinged into a cement conveying pipeline, and when the spiral reamer rotates reversely, cement in the sleeve is hinged into a blanking hose for blanking;
the upper end cover is horizontally and fixedly arranged and positioned at the lower part of the sleeve, and the bottom surface of the upper end cover is provided with an air pressure sensor;
one end of the blanking hose is communicated with the sleeve, and the other end of the blanking hose penetrates through the upper end cover;
the charging barrel is positioned at the lower part of the upper end cover and can be lifted, and a weighing sensor for weighing the weight of the cement sample is arranged in the charging barrel; when the charging barrel is lifted for discharging, the charging barrel is propped against the upper end cover to form a closed accommodating space for accommodating the cement sample, and the air pressure sensor is positioned in the accommodating space;
the sampling control system and the dispersion control system can set blanking and sampling control parameters, send blanking and sampling control instructions to the sampling execution system, control the charging barrel to lift for sampling, control the rotation of the spiral reamer for blanking, and read measurement values of the air pressure sensor and the weighing sensor in real time to realize stable blanking and sampling of cement samples; the sampling control system is close to the sampling execution system, and the distributed control system is far away from the sampling execution system;
the sampling execution system comprises a frame fixedly arranged, a second motor fixedly connected with the frame, a vertically arranged screw rod, a second coupler for connecting the screw rod with a rotating end of the second motor, a supporting platform fixedly connected with a moving end of the screw rod, a fixedly arranged first motor and a first coupler for connecting the moving end of the first motor with a spiral reamer; the charging barrel comprises an outer barrel fixedly mounted on a supporting platform, an inner barrel which is positioned in the outer barrel and hung on the upper end edge of the outer barrel, a flexible bag hung at the lower end of the inner barrel, and an inner barrel supporting plate which supports the flexible bag and is pressed on the weighing sensor.
2. The cement stabilized sampling device of claim 1, wherein the sampling control system comprises:
the controller is used for sending a control instruction to the sampling execution system;
the man-machine interaction module is in signal connection with the controller and is used for setting blanking and sampling control parameters by an operator and checking execution states in the blanking and sampling processes;
the input/output module is used for connecting the controller with the sampling execution system, reading signals from the air pressure sensor and the weighing sensor, forwarding control instructions of the controller and driving the first motor and the second motor to execute actions;
and the communication module is used for enabling the controller to be communicated with a remote distributed control system so as to realize bidirectional communication.
3. The cement stabilized sampling device of claim 2, wherein: the distributed control system includes:
a gateway for establishing communication between the sampling control system and the operator station, engineer station, host device;
an operator station including a computer host used by a central office operator; the central control room operator can check the operation parameters of the host equipment on the operator station and send a control instruction to the sampling execution system;
the engineer station comprises a computer host, has the same function as the operator station and can edit the distributed control system program and update the distributed control system program into the operator station;
the host equipment comprises all process equipment connected to the distributed control system.
4. A sampling method of the cement stabilized sampling device as claimed in claim 3, comprising the steps of:
setting an operation mode: an operator selects an operation mode as a near-end mode or a far-end mode in the man-machine interaction module; the near-end mode directly controls the sampling execution system to execute the feeding and sampling actions through the sampling control system, and the far-end mode indirectly controls the sampling execution system to execute the feeding and sampling actions through the distributed control system; in the process of executing the blanking and sampling actions, the control parameters and the execution states of the blanking and sampling actions, and real-time measurement values of the weighing sensor and the air pressure sensor are synchronized into the man-machine interaction module and the operator station;
setting a blanking control parameter, and starting a blanking task: when the near-end mode is selected, setting the total blanking weight, the single blanking weight, the blanking frequency and the blanking air pressure interval in a man-machine interaction module by an operator, and starting a blanking task; when the remote mode is selected, setting the total weight, the single blanking weight, the blanking frequency and the blanking air pressure interval of blanking in an operator station by an operator, and starting a blanking task; the blanking task and the blanking action are different in that the blanking action is to periodically execute the blanking task, and when the blanking task is started, the blanking action is periodically executed; when the blanking task is terminated, the blanking action stops executing;
compacting the charging barrel: if the feeding is performed for the first time, or before the feeding is performed again after the last sampling is performed, the controller drives the second motor to rotate reversely, the screw rod rotates the supporting platform to move upwards, and the upper end of the charging barrel is tightly pressed with the upper end cover;
and (3) executing the following actions: the controller monitors the air pressure in the charging barrel through the air pressure sensor, and when the detected air pressure is in the blanking air pressure interval, the controller drives the first motor to periodically rotate forwards and reversely according to the set blanking frequency, so as to drive the spiral reamer to periodically rotate forwards and reversely; when the spiral reamer rotates positively, cement in the sleeve is reamed out into the cement conveying pipeline; when the spiral reamer rotates reversely, cement in the sleeve is reamed in and is discharged into the charging barrel;
performing a sampling action: when the weight of the cement sample in the charging barrel reaches the total discharging weight, if a near-end mode is selected, an operator sends out a sampling control instruction through a man-machine interaction module; if a remote mode is selected, an operator sends a sampling control instruction through an operator station, the controller drives the second motor to rotate forward, the screw rod rotates to drive the supporting platform to move downwards, the charging barrel is separated from contact with the upper end cover, and the operator takes away a cement sample in the charging barrel;
and (5) finishing the blanking task: when the enterprise stops production and does not need sampling, if a near-end mode is selected, an operator finishes a blanking task in the man-machine interaction module; if the remote mode is selected, the operator ends the blanking task in the operator station.
5. The sampling method of a cement stabilized sampling device as claimed in claim 4, wherein: when one of the operation modes is selected, the other operation mode is automatically disabled unless the operation mode is reset after the blanking task is finished.
6. The sampling method of a cement stabilized sampling device as claimed in claim 4, wherein: after the blanking action is executed, if the weight of the cement in the charging barrel does not reach the total weight of the blanking, but an operator needs to finish the blanking action in advance, the blanking action is stopped, and the sampling action is executed.
7. The sampling method of a cement stabilized sampling device as claimed in claim 4, wherein: when the air pressure in the charging barrel is detected not to be in the blanking air pressure interval, the sampling execution system does not execute blanking action, and an air pressure abnormality alarm is sent out in the man-machine interaction module and the operator station.
8. The sampling method of a cement stabilized sampling device as claimed in claim 4, wherein: when the blanking action is executed, the controller reads the measurement value of the weighing sensor in real time, and the weight of the cement sample in the charging barrel is obtained; if the weight of the cement sample in the charging barrel is larger than or equal to the set total discharging weight, the controller controls the sampling execution system to stop discharging into the charging barrel.
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