CN117772406A - Coarse and medium running integrated detection device and online detection method for coal preparation plant - Google Patents
Coarse and medium running integrated detection device and online detection method for coal preparation plant Download PDFInfo
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Abstract
The invention discloses a coarse and medium running integrated detection device for a coal preparation plant, which comprises the following components: feeding sieve basket, feeding buffer barrel, magnetic substance content meter, water supplementing system, video acquisition device, industrial control all-in-one, alarm signal generator and signal interface, a coal preparation factory thick, running integration on-line measuring method, include: and acquiring a relevant signal combination at the feeding buffer barrel, converting and calculating based on the relevant signal combination to obtain a running analysis result, wherein the relevant signal combination comprises correlation photoelectric switch signals of a water flow annunciator and inductance detection data of a magnetic substance content meter, acquiring image signals at the feeding screen basket, and obtaining a running analysis result based on the image signals and the inductance detection data. The invention solves the problems that the prior art has no effective on-line detection method for the running medium of the oversize material, the on-line detection precision of the running coarse of the slime water is lower, and the reconstruction workload and the investment are high when the prior detection means are installed on site.
Description
Technical Field
The invention relates to the technical field of intelligent online detection of coal preparation plants, in particular to a coarse and medium running integrated detection device and an online detection method for a coal preparation plant.
Background
The intelligent bottom layer of the coal preparation plant highly depends on the high-reliability and high-precision on-line monitoring sensor, and only the accurate on-line sensing of the coal preparation production process is realized, the production parameters can be fed back in real time and accurately regulated, so that the production process management and control of the coal preparation plant is realized. The on-line monitoring of the coarse and medium running condition of the coal preparation plant is always a pain point and difficulty which plague the coal preparation plant.
The coarse run condition of the coal preparation plant refers to coarse run of a slime water system, which can seriously influence the operation conditions of the subsequent coarse slime separation, fine slime flotation and concentration filter pressing systems, and even cause production accidents of shutdown of the coal preparation plant when serious; in addition, the loss of the clean coal products is unavoidable, and the economic benefit of coal preparation plants is damaged.
The running medium is always the focus of production of coal preparation plants, and when the running medium of the coal preparation plants is selected, on one hand, the medium consumption is obviously increased, and the production cost is greatly increased; on the other hand, the heavy medium of the coal preparation plant is generally magnetite powder) Fe as a high atomic number element changes the action rule of rays and substances fromAnd the detection precision of on-line monitoring equipment such as ash content, moisture and the like of the coal preparation plant is seriously influenced, so that the production management of the coal preparation plant is influenced. In the prior art, two general methods for realizing coarse monitoring of a coal preparation plant are adopted, namely an indirect detection method for detecting the existence of overflow water by sensing such as a photoelectric switch, a water immersion detection sensor and the like is adopted; secondly, the coarse particles are directly detected by using a camera which is arranged in the space above various barrels. The method has the advantages that a small amount of application is realized in the industry due to low technical threshold and low price, but the false alarm rate is high, and the screening plate is easy to block, needs manual frequent maintenance and has poor use effect; the second method adopts images to directly detect coarse particles, the detection accuracy is higher than that of the first method, but various barrels such as a slime barrel, a medium mixing barrel, a medium thinning barrel and the like of a coal preparation plant are usually arranged on one layer of the coal preparation plant, the space above the barrel is narrow, the water vapor is heavy, the installation environment is poor, and the detection result is easily influenced by environmental change, so that the second method is applied to test points of individual coal preparation plants.
Meanwhile, with the development of magnetic separation technology, the main reason for medium loss of a coal preparation plant is generally found in the industry, and the coal preparation plant generally adopts manual sampling due to the lack of an on-line monitoring means for medium conditions of the medium removal screening oversize material, and the magnetic separation experiment is carried out in a laboratory by using a magnetic separation tube to realize the magnetic content detection of the oversize material, so that the operation working condition of equipment or a system is judged.
Therefore, there is a need for an integrated detection device and an online detection method for coarse and medium running in a coal preparation plant to solve the above-mentioned problems.
Disclosure of Invention
The invention aims to provide a coarse and medium running integrated detection device and an online detection method for a coal preparation plant, which are used for realizing coarse and medium running integrated detection work of the coal preparation plant, and have remote and on-site operation functions so as to solve the problems in the background technology.
In order to achieve the above purpose, the present invention provides the following technical solutions:
coarse and medium running integrated detection device for coal preparation plant comprises: the automatic feeding device comprises a feeding screen basket, a feeding buffer barrel, a magnetic substance content meter, a water supplementing system, a video acquisition device, a controller, an industrial control integrated machine, an alarm signal generator and a signal interface, wherein the feeding screen basket is arranged at the top end of the feeding buffer barrel, the magnetic substance content meter is arranged at the lower end of the feeding buffer barrel, and the controller is respectively connected with the video acquisition device, the industrial control integrated machine and the alarm signal generator;
a feeding pipeline is arranged above the feeding screen basket, a feeding valve is arranged on the feeding pipeline, and the screen plate at the bottom of the feeding screen basket is opened and closed by 0 degree and 90 degrees or turned by 0 degree and 180 degrees through an actuating mechanism;
the video acquisition device is arranged on one side above the feeding screen basket, is provided with an industrial light source and uploads an acquired video to the industrial control integrated machine through the communication device;
the feeding buffer barrel is provided with an overflow weir and an overflow pipe, a water flow signal device is arranged on the overflow pipe, a magnetic substance content detection pipe is arranged at the bottom of the feeding buffer barrel, a detection pipe regulating valve and a magnetic substance content meter are arranged on the magnetic substance content detection pipe, a coarse particle discharge pipe is arranged at the bottom of the feeding buffer barrel, and a coarse particle discharge valve is arranged on the coarse particle discharge pipe;
the water supplementing system comprises a water supplementing pipe, a first water supplementing valve, a second water supplementing valve and a third water supplementing valve, and flushing of the feeding buffer barrel, the feeding screen basket and the magnetic substance content detecting pipe is carried out through the first water supplementing valve, the second water supplementing valve and the third water supplementing valve respectively;
the feeding valve, the executing mechanism, the water flow signal device, the detecting tube regulating valve, the magnetic substance content meter, the coarse particle discharging valve, the first water supplementing valve, the second water supplementing valve, the third water supplementing valve and the alarm signal generator are all connected through wires and connected to the controller;
the industrial control integrated machine is used for simultaneously realizing detection data and image storage, on-line detection method execution and front end display.
Preferably, the bottom sieve plate of the feeding sieve basket is fixed with the two side sieve plates at one side, and the opening and closing of the bottom sieve plate are realized by 0 degrees and 90 degrees through the electro-hydraulic push rod.
Preferably, the video acquisition device is an industrial camera, the signal interface is a Modbus TCP signal interface, the communication device is a POE switch, the industrial camera directly takes power from the POE switch, the controller is a programmable logic controller, and the industrial control integrated machine is connected with the programmable logic controller through an Ethernet and uses a TCP/IP protocol for data transmission.
Preferably, the feeding valve is an electric switch gate valve, the detecting tube regulating valve is an electric regulating gate valve, the coarse particle discharging valve is an electric switch Guan Zhafa, the first water supplementing valve, the second water supplementing valve and the third water supplementing valve are electric switch butterfly valves or electric switch ball valves, the diameter of a conduit of the magnetic substance containing meter is DN50mm, a solenoid coil is made of copper-silver alloy materials, and the diameter of the section of the conduit is less than or equal to 0.25mm.
The second aspect of the invention provides a coarse and medium running integrated online detection method for a coal preparation plant, which comprises the following steps:
s1, collecting a relevant signal combination at the feeding buffer barrel, and converting and calculating based on the relevant signal combination to obtain a running medium analysis result, wherein the relevant signal combination comprises a correlation photoelectric switch signal of a water flow annunciator and inductance detection data of a magnetic substance content meter;
s2, acquiring an image signal of the feeding basket and inductance detection data of the magnetic substance content meter, and obtaining a coarse analysis result based on the image signal and the inductance detection data.
Preferably, the S1 includes:
s11, collecting correlation photoelectric switch signals of a water flow annunciator arranged on the overflow pipe of the feeding buffer barrel;
s12, collecting inductance detection data of the magnetic substance content meter;
s13, obtaining a running medium analysis result based on conversion calculation of the correlation photoelectric switch signal and the inductance value detection data.
Preferably, the S2 includes:
s21, collecting a material image on a feeding screen basket, and preprocessing the material image to obtain an initial image of a material to be analyzed;
s22, carrying out feature extraction and feature analysis on the initial image of the material to be analyzed, and obtaining a coarse analysis result based on the feature extraction and feature analysis result and the inductance value detection data.
Preferably, S13 includes:
s131, obtaining mixed ore pulp based on conversion calculation of the correlation photoelectric switch signal and the inductance value detection data
The magnetic permeability and the conversion calculation method are shown as the formula (1):
wherein L is inductance, < >>Is of vacuum permeability->Is magnetic substance permeability, n is coil turns, s is coil cross-sectional area, < >>Is the coil length;
s132, further converting and calculating the magnetic permeability based on the mixed ore pulp to obtain the magnetic substance content in the ore pulp, wherein the magnetic substance content is shown in a formula (2):
wherein (1)>For the magnetic substance content change, +.>Is magnetic permeability of circulating water->The magnetic permeability of the ore pulp is changed;
s133, obtaining a running analysis result based on the magnetic substance content and a set first threshold value, and triggering an alarm during running.
Preferably, the preprocessing of the material image in S21 includes:
s211, cutting the acquired image, and removing a useless area to obtain a first preprocessed image;
s212, smoothing the cut first preprocessing image based on bilateral filtering, and eliminating abnormal pixel values to obtain a second preprocessing image, wherein the second preprocessing image is used as an initial image of a material to be analyzed for subsequent input.
Preferably, the S22 includes:
s221, extracting color, size and texture characteristics of an initial image of the material to be analyzed as extracted image characteristics;
s222, taking the extracted image features and the inductance value detection data as inputs, and respectively using a random forest, a support vector machine and a neural network model to establish a relation model between the three inputs and the material grain distribution in the initial image of the material to be analyzed;
s223, giving three relation models with different weights to establish a mixed model, and taking the output of the mixed model as the final output of the size distribution of materials in an original image;
s224, judging whether the rough running is performed or not according to the second threshold value obtained through setting, and triggering an alarm when the rough running is performed.
Compared with the prior art, the invention has the beneficial effects that:
the invention realizes the coarse-running and medium-running conditions of key production links of the coal preparation plant by one-time sampling in the production process of the coal preparation plant through the coarse-running and medium-running integrated detection device and the online detection method based on the machine vision and magnetic line cutting principle, and solves the problems that the prior art has no effective online detection method for coarse-running materials on a medium-removing sieve of the coal preparation plant, the online detection precision of slime water coarse-running is lower, and the improvement workload is large and the investment is high when the prior detection means are installed on site.
Meanwhile, the coarse running and medium running online detection method solves the problems of long detection period and serious hysteresis of the existing detection means, provides timely and accurate bottom data for intellectualization of the coal preparation plant, and improves the intelligent production control level of the coal preparation plant.
Drawings
Fig. 1 is a system diagram of a coarse and medium running integrated detection device for a coal preparation plant according to a preferred embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a coarse and medium running integrated detection device for a coal preparation plant according to a preferred embodiment of the present invention.
Fig. 3 is a flowchart of a coarse and medium running integrated online detection method of a coal preparation plant according to a preferred embodiment of the present invention.
Fig. 4 is a flowchart of step S1 in the coal preparation plant coarse running and medium running integrated online detection method according to the preferred embodiment of the invention.
Fig. 5 is a flowchart of step S2 in the coal preparation plant coarse running and medium running integrated online detection method according to the preferred embodiment of the invention.
FIG. 6 is a diagram showing a step S13 of the coal preparation plant coarse and medium running integrated on-line detection method according to the preferred embodiment of the present invention
A flow chart.
Fig. 7 is a flowchart of step S21 in the coal preparation plant coarse running and medium running integrated online detection method according to the preferred embodiment of the present invention.
Fig. 8 is a flowchart of step S22 in the coal preparation plant coarse running and medium running integrated online detection method according to the preferred embodiment of the present invention.
In the figure: 1-feeding pipeline, 2-feeding valve, 3-feeding sieve basket, 4-actuating mechanism, 5-feeding buffer barrel, 6-overflow weir, 7-overflow pipe, 8-water flow signal device, 9-magnetic substance content detection tube, 10-detection tube regulating valve, 11-magnetic substance content meter, 12-coarse particle discharge tube, 13-coarse particle discharge valve, 14-water supplementing tube, 15-first water supplementing valve, 16-second water supplementing valve, 17-third water supplementing valve, 18-industrial light source, 19-industrial camera, 20-communication device, 21-programmable logic controller, 22-industrial control integrated machine and 23-alarm signal generator.
Detailed Description
Various exemplary embodiments, features and aspects of the present application will be described in detail below with reference to the accompanying drawings. In the drawings, like reference numbers indicate identical or functionally similar elements. Although various aspects of the embodiments are illustrated in the accompanying drawings, the drawings are not necessarily drawn to scale unless specifically indicated.
The word "exemplary" is used herein to mean "serving as an example, embodiment, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments.
In addition, numerous specific details are set forth in the following examples in order to provide a better understanding of the present application. It will be understood by those skilled in the art that the present application may be practiced without some of these specific details. In some instances, well known methods, procedures, and components have not been described in detail so as not to obscure the subject matter of the present application.
Example 1
Referring to fig. 1-2, a coarse and medium running integrated detection device for a coal preparation plant comprises: the feeding screen basket 3, the feeding buffer barrel 5, the magnetic substance content meter 11, the water supplementing system, the video acquisition device, the controller, the industrial control integrated machine 22, the alarm signal generator 23 and the signal interface, wherein the feeding screen basket 3 is arranged at the top end of the feeding buffer barrel 5, the magnetic substance content meter 11 is arranged at the lower end of the feeding buffer barrel 5, and the controller is respectively connected with the video acquisition device, the industrial control integrated machine 22 and the alarm signal generator 23;
a feeding pipeline 1 is arranged above the feeding screen basket 3, a feeding valve 2 is arranged on the feeding pipeline 1, and a screen plate at the bottom of the feeding screen basket 3 is opened and closed by 0 degree and 90 degrees or turned by 0 degree and 180 degrees through an actuating mechanism 4;
the video acquisition device is arranged on one side above the feeding screen basket 3, is provided with an industrial light source 18 and uploads acquired videos to the industrial control integrated machine 22 through a communication device 20;
the feeding buffer barrel 5 is provided with an overflow weir 6 and an overflow pipe 7, a water flow annunciator 8 is arranged on the overflow pipe 7, a magnetic substance content detection pipe 9 is arranged at the bottom of the feeding buffer barrel 5, a detection pipe regulating valve 10 and a magnetic substance content meter 11 are arranged on the magnetic substance content detection pipe 9, a coarse particle discharge pipe 12 is arranged at the bottom of the feeding buffer barrel 5, and a coarse particle discharge valve 13 is arranged on the coarse particle discharge pipe 12;
the water supplementing system comprises a water supplementing pipe 14, a first water supplementing valve 15, a second water supplementing valve 16 and a third water supplementing valve 17, and flushing is carried out on the feeding buffer barrel 5, the feeding screen basket 3 and the magnetic substance content detection pipe 9 through the first water supplementing valve 15, the second water supplementing valve 16 and the third water supplementing valve 17 respectively;
the feeding valve 2, the executing mechanism 4, the water flow signal device 8, the detecting tube regulating valve 10, the magnetic substance content meter 11, the coarse particle discharge valve 13, the first water supplementing valve 15, the second water supplementing valve 16, the third water supplementing valve 17 and the alarm signal generator 23 are all connected through wires and connected to the controller;
the industrial personal computer 22 is used for simultaneously realizing detection data and image storage, on-line detection method execution and front end display.
Preferably, the bottom sieve plate of the feeding sieve basket 3 is fixed with the two side sieve plates at one side, and the opening and closing of the bottom sieve plate are realized by 0 degrees and 90 degrees through the electro-hydraulic push rod.
Preferably, the video acquisition device is an industrial camera 19, the signal interface is a Modbus TCP signal interface, the communication device 20 is a POE switch, the industrial camera 19 directly takes power from the POE switch, the controller is a programmable logic controller 21, and the industrial control integrated machine 22 and the programmable logic controller 21 are connected through an ethernet and use a TCP/IP protocol to perform data transmission.
Preferably, the feeding valve 2 is an electric switch gate valve, the detecting tube regulating valve 10 is an electric regulating gate valve, the coarse particle discharging valve 13 is an electric switch gate valve, the first water supplementing valve 15, the second water supplementing valve 16 and the third water supplementing valve 17 are electric switch butterfly valves or electric switch ball valves, the diameter of a conduit of the magnetic substance content meter 11 is DN50mm, a solenoid coil is made of copper-silver alloy materials, and the diameter of the section of the conduit is less than or equal to 0.25mm.
Example two
Referring to fig. 3, the embodiment provides an on-line detection method for coarse and medium running integration of a coal preparation plant, which comprises the following steps:
s1, collecting a relevant signal combination at the feeding buffer bucket 5, and converting and calculating based on the relevant signal combination to obtain a running medium analysis result, wherein the relevant signal combination comprises correlation photoelectric switch signals of a water flow annunciator 8 and inductance detection data of a magnetic substance content meter 11;
s2, acquiring an image signal of the feeding screen basket 3 and inductance detection data of the magnetic substance content meter 11, and obtaining a coarse analysis result based on the image signal and the inductance detection data.
Referring to fig. 4, as a preferred embodiment, the step S1 includes:
s11, collecting correlation photoelectric switch signals of a water flow annunciator 8 arranged on the overflow pipe 7 of the feeding buffer bucket 5;
s12, acquiring inductance detection data of the magnetic substance content meter 11;
s13, obtaining a running medium analysis result based on conversion calculation of the correlation photoelectric switch signal and the inductance value detection data.
Referring to fig. 5, as a preferred embodiment, the step S2 includes:
s21, collecting a material image on a feeding screen basket 3, and preprocessing the material image to obtain an initial image of a material to be analyzed;
s22, carrying out feature extraction and feature analysis on the initial image of the material to be analyzed, and obtaining a coarse analysis result based on the feature extraction and feature analysis result and the inductance value detection data.
Referring to fig. 6, as a further scheme of the present invention: the implementation principle of S13 is as follows:
when the ore pulp passes through the magnetic substance content detection tube 9, the ore pulp consists of coal slime, magnetite powder and water, the water and the coal slime are non-magnetic substances, the magnetic permeability of the water and the coal slime is close to the vacuum magnetic permeability and is dimensionless, 1, the magnetite powder is magnetic substances, and the magnetic permeability of the magnetite powder is higher than the vacuum magnetic permeability by more than two orders of magnitude, so when the ore pulp passes through a solenoid coil of the magnetic substance content detection tube 9, the magnetic permeability of the ore pulp changes along with the change of the magnetic substance content, and the inductance of the solenoid coil is proportional to the magnetic substance content.
S13 comprises the following steps:
s131, obtaining mixed ore pulp based on conversion calculation of the correlation photoelectric switch signal and the inductance value detection data
The magnetic permeability and the conversion calculation method are shown as the formula (1):
wherein L is inductance, < >>Is of vacuum permeability->Is magnetic substance permeability, n is coil turns, s is coil cross-sectional area, < >>Is the coil length;
s132, further converting and calculating the magnetic permeability based on the mixed ore pulp to obtain the magnetic substance content in the ore pulp, wherein the magnetic substance content is shown in a formula (2):
wherein (1)>For the magnetic substance content change, +.>Is magnetic permeability of circulating water->The magnetic permeability of the ore pulp is changed;
s133, obtaining a running analysis result based on the magnetic substance content and a set first threshold value, and triggering an alarm during running.
Referring to fig. 7, as a further scheme of the present invention: the preprocessing of the material image in S21 includes:
s211, cutting the acquired image, and removing a useless area to obtain a first preprocessed image;
s212, smoothing the cut first preprocessing image based on bilateral filtering, and eliminating abnormal pixel values to obtain a second preprocessing image, wherein the second preprocessing image is used as an initial image of a material to be analyzed for subsequent input.
Referring to fig. 8, as a still further scheme of the present invention: the S22 includes:
s221, extracting color, size and texture characteristics of an initial image of the material to be analyzed as extracted image characteristics;
s222, taking the extracted image features and the inductance value detection data as inputs, and respectively using a random forest, a support vector machine and a neural network model to establish a relation model between the three inputs and the material grain distribution in the initial image of the material to be analyzed;
s223, giving three relation models with different weights to establish a mixed model, and taking the output of the mixed model as the final output of the size distribution of materials in an original image;
s224, judging whether the rough running is performed or not according to the second threshold value obtained through setting, and triggering an alarm when the rough running is performed.
The working process is as follows:
1) The feeding valve 2, the actuating mechanism 4, the water flow annunciator 8, the detecting tube regulating valve 10, the magnetic substance content meter 11, the coarse particle discharging valve 13, the first water supplementing valve 15, the second water supplementing valve 16 and the third water supplementing valve 17 are all connected through wires and connected into the programmable logic controller 21, and meanwhile, the programmable logic controller 21 is connected with the industrial control integrated machine 22 through the Ethernet.
2) According to the equipment start signal, the feeding valve 2 is automatically opened, bypass material taking is performed, the undersize water or centrifugate of a production system of a coal preparation plant enters the feeding screen basket 3 (screen gap is 5mm and is adjustable according to the field process) through the feeding pipeline 1, and during normal production, fine particles and ore pulp completely enter the feeding buffer barrel 5 below through the feeding screen basket 3.
3) The overflow weir 6 and the overflow pipe 7 are arranged on the feeding buffer barrel 5, the diameter (DN 25 mm) of the overflow pipe 7 is equal to or larger than that of the overflow pipe 7, the correlation photoelectric switch is arranged on the overflow pipe 7, the coarse particle discharge valve 13 at the bottom of the feeding buffer barrel 5 is kept in a normally closed state, fine particles and slurry entering the feeding buffer barrel 5 are discharged through the overflow pipe 7 and the magnetic substance content detection pipe 9, the safety threshold can be set by adjusting the opening of the detection pipe regulating valve 10 (for example, the normal detection state is realized by adjusting the opening of the regulating valve, the opening of the regulating valve is more than or equal to 50%, the blocking of the pipe is avoided), and the overflow pipe 7 always has overflow water (judged by the correlation photoelectric switch signal), so that the magnetic substance content detection pipe 9 is always in a full pipe state, and the detection precision of the magnetic substance content meter 11 is ensured.
4) When the feeding is in the process of 'running', when the magnetic substance in the feeding pulp passes through the magnetic field of the solenoid coil in the magnetic substance content meter 11, an additional magnetic field is generated, so that an additional voltage is generated, and the inductance value detection value and the magnetic substance content calculation value of the magnetic substance content meter 11 change because the additional voltage is in direct proportion to the content of the magnetic substance.
5) The running alarm threshold is set, and when the magnetic content detected by the magnetic content meter 11 exceeds 1.5g/L (adjustable) under the premise that the overflow pipe 7 overflows, the running alarm is triggered, and the alarm signal generator 23 sends out an audible and visual alarm.
6) When the feeding is 'coarse', coarse particles are trapped on a horizontal sieve plate at the bottom of the feeding sieve basket 3, an industrial camera 19 above the feeding sieve basket 3 irradiates the horizontal sieve plate at the bottom of the sieve basket, the acquired image is transmitted back to the industrial control integrated machine 22 by the POE switch, and the industrial control integrated machine 22 performs coarse particle size distribution detection according to a preset algorithm based on image feature extraction, analysis and machine learning.
8) Setting a coarse-running alarm threshold, and triggering coarse-running alarm when the coarse-running particle area which exceeds 5mm (adjustable) and occupies more than 20 percent (adjustable) of the area of all coarse particles on the screen surface in a defined range on a horizontal screen plate at the bottom of the feeding screen basket 3, wherein the alarm signal generator 23 sends out audible and visual alarm.
9) After coarse alarm is generated, when coarse particle area exceeding 5mm (adjustable) in a defined range on a horizontal screen plate at the bottom of a feeding screen basket 3 occupies more than 40% (adjustable) of all coarse particle area on a screen surface or all coarse particle area on the screen surface exceeds a preset safety threshold value, a feeding valve 2 is automatically closed, the screen plate at the bottom of the feeding screen basket 3 is automatically opened through linear motion of an electro-hydraulic push rod, a detection tube regulating valve 10 (DN 50) is fully opened, a coarse particle discharging valve 13 (DN 200) is fully opened, and the feeding screen basket is operated for 2min (adjustable) in the state, so that smooth discharging of feeding materials from the device is ensured, and the blocking of the device is avoided.
10 After the slurry in the feeding buffer barrel 5 is completely discharged, the water supplementing system is automatically started, the first water supplementing valve 15, the second water supplementing valve 16 and the third water supplementing valve 17 are automatically opened, and flushing (30S, time adjustment) of the feeding buffer barrel 5, the feeding screen basket 3 and the magnetic substance content detection tube 9 is carried out, so that no residual coarse particles exist in the device.
11 After automatic or manual alarm elimination, the system automatically resets to an initial state, the feeding valve 2 is automatically opened, the material is fed into the device, and the next detection process is carried out until the equipment stop signal is received.
12 When the equipment shutdown signal is received, firstly, the feeding valve 2 is automatically closed, the sieve plate at the bottom of the feeding sieve basket 3 is automatically opened through the linear motion of the electrohydraulic push rod, the detection pipe regulating valve 10 (DN 50) is fully opened, the coarse particle discharge valve 13 (DN 200) is fully opened, the operation is carried out for 2min (adjustable) in the state, secondly, the first water supplementing valve 15, the second water supplementing valve 16 and the third water supplementing valve 17 are automatically opened (30S, adjustable) to discharge coarse particles in the device, and then, the shutdown process is automatically executed again, the initial state of the system is restored, and the equipment is kept electrified.
What needs to be specifically stated is: the invention realizes the coarse-running and medium-running conditions of key production links of the coal preparation plant by one-time sampling in the production process of the coal preparation plant through the coarse-running and medium-running integrated detection device and the online detection method based on the machine vision and magnetic line cutting principle, and solves the problems that the prior art has no effective online detection method for coarse-running materials on a medium-removing sieve of the coal preparation plant, the online detection precision of slime water coarse-running is lower, and the improvement workload is large and the investment is high when the prior detection means are installed on site. Meanwhile, the coarse running and medium running online detection method solves the problems of long detection period and serious hysteresis of the existing detection means, provides timely and accurate bottom data for intellectualization of the coal preparation plant, and improves the intelligent production control level of the coal preparation plant.
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
The claims, rather than the foregoing description, are therefore intended to be limiting in all respects, all falling within the meaning and range of equivalency of the claims
Variations are encompassed within the present invention.
Furthermore, it should be understood that while the present description describes embodiments, not every embodiment contains only
The description of the embodiments is provided for clarity only, and those skilled in the art will recognize that the embodiments of the embodiments may be combined as appropriate to form other embodiments as would be understood by those skilled in the art.
Claims (10)
1. Coarse and medium running integrated detection device for coal preparation plant, which is characterized by comprising: the feeding screen basket (3), a feeding buffer barrel (5), a magnetic substance content meter (11), a water supplementing system, a video acquisition device, a controller, an industrial control integrated machine (22), an alarm signal generator (23) and a signal interface, wherein the feeding screen basket (3) is arranged at the top end of the feeding buffer barrel (5), the magnetic substance content meter (11) is arranged at the lower end of the feeding buffer barrel (5), and the controller is respectively connected with the video acquisition device, the industrial control integrated machine (22) and the alarm signal generator (23);
a feeding pipeline (1) is arranged above the feeding basket (3), a feeding valve (2) is arranged on the feeding pipeline (1), and a screen plate at the bottom of the feeding basket (3) is opened and closed by 0 degree and 90 degrees or turned by 0 degree and 180 degrees through an actuating mechanism (4);
the video acquisition device is arranged on one side above the feeding screen basket (3), is provided with an industrial light source (18), and uploads an acquired video to the industrial control integrated machine (22) through the communication device (20);
the feeding buffer barrel (5) is provided with an overflow weir (6) and an overflow pipe (7), a water flow signal device (8) is arranged on the overflow pipe (7), a magnetic substance content detection pipe (9) is arranged at the bottom of the feeding buffer barrel (5), a detection pipe regulating valve (10) and a magnetic substance content meter (11) are arranged on the magnetic substance content detection pipe (9), a coarse particle discharge pipe (12) is arranged at the bottom of the feeding buffer barrel (5), and a coarse particle discharge valve (13) is arranged on the coarse particle discharge pipe (12);
the water supplementing system comprises a water supplementing pipe (14), a first water supplementing valve (15), a second water supplementing valve (16) and a third water supplementing valve (17), and flushing is carried out on the feeding buffer barrel (5), the feeding screen basket (3) and the magnetic substance content detecting pipe (9) through the first water supplementing valve (15), the second water supplementing valve (16) and the third water supplementing valve (17);
the feeding valve (2), the actuating mechanism (4), the water flow signal device (8), the detecting tube regulating valve (10), the magnetic substance content meter (11), the coarse particle discharging valve (13), the first water supplementing valve (15), the second water supplementing valve (16), the third water supplementing valve (17) and the alarm signal device (23) are all connected through wires and connected into the controller.
2. The coal preparation plant coarse and medium running integrated detection device according to claim 1, wherein the bottom sieve plate of the feeding sieve basket (3) is fixed with the two side sieve plates at one side, and the opening and closing of the bottom sieve plate are realized by 0 degrees and 90 degrees through an electro-hydraulic push rod.
3. The coal preparation plant coarse running and medium running integrated detection device according to claim 2, wherein the video acquisition device is an industrial camera (19), the signal interface is a Modbus TCP signal interface, the communication device (20) is a POE switch, the industrial camera (19) directly takes power from the POE switch, the controller is a programmable logic controller (21), and the industrial control integrated machine (22) is connected with the programmable logic controller (21) through an Ethernet and uses a TCP/IP protocol for data transmission.
4. The coal preparation plant coarse-running and medium-running integrated detection device according to claim 3, wherein the feeding valve (2) is an electric switch gate valve, the detection tube regulating valve (10) is an electric switch gate valve, the coarse particle discharging valve (13) is an electric switch gate valve, the first water supplementing valve (15), the second water supplementing valve (16) and the third water supplementing valve (17) are electric switch butterfly valves or electric switch ball valves, the diameter of a conduit of the magnetic substance content meter (11) is DN50mm, a solenoid coil is made of copper-silver alloy materials, and the diameter of the section of the conduit is less than or equal to 0.25mm.
5. An integrated online detection method for coarse and medium running of a coal preparation plant based on the detection device of any one of claims 1-4, which is characterized by comprising the following steps:
s1, collecting a relevant signal combination at the feeding buffer barrel (5), and converting, calculating and obtaining a running analysis result based on the relevant signal combination, wherein the relevant signal combination comprises correlation photoelectric switch signals of a water flow annunciator (8) and inductance detection data of a magnetic substance content meter (11);
s2, acquiring image signals at the feeding screen basket (3) and inductance value detection data of the magnetic substance content meter (11), and obtaining a coarse analysis result based on the image signals and the inductance value detection data.
6. The coal preparation plant coarse running and medium running integrated online detection method according to claim 5, wherein the step S1 comprises:
s11, collecting correlation photoelectric switch signals of a water flow annunciator (8) arranged on the overflow pipe (7) of the feeding buffer bucket (5);
s12, collecting inductance detection data of the magnetic substance content meter (11);
s13, obtaining a running medium analysis result based on conversion calculation of the correlation photoelectric switch signal and the inductance value detection data.
7. The coal preparation plant coarse running and medium running integrated online detection method according to claim 6, wherein the step S2 comprises:
s21, collecting a material image on a feeding screen basket (3), and preprocessing the material image to obtain an initial image of a material to be analyzed;
s22, carrying out feature extraction and feature analysis on the initial image of the material to be analyzed, and obtaining a coarse analysis result based on the feature extraction and feature analysis result and the inductance value detection data.
8. The coal preparation plant coarse running and medium running integrated online detection method according to claim 7, wherein S13 comprises:
s131, obtaining mixed ore pulp based on conversion calculation of the correlation photoelectric switch signal and the inductance value detection data
The magnetic permeability and the conversion calculation method are shown as the formula (1):
wherein L is inductance, < >>Is of vacuum permeability->Is magnetic substance permeability, n is coil turns, s is coil cross-sectional area, < >>Is the coil length;
s132, further converting and calculating the magnetic permeability based on the mixed ore pulp to obtain the magnetic substance content in the ore pulp, wherein the magnetic substance content is shown in a formula (2):
wherein (1)>For the magnetic substance content change, +.>For the magnetic permeability of the circulating water,the magnetic permeability of the ore pulp is changed;
s133, obtaining a running analysis result based on the magnetic substance content and a set first threshold value, and triggering an alarm during running.
9. The method for integrated coarse and medium running detection in a coal preparation plant according to claim 8, wherein the preprocessing of the material image in S21 comprises:
s211, cutting the acquired image, and removing a useless area to obtain a first preprocessed image;
s212, smoothing the cut first preprocessing image based on bilateral filtering, and eliminating abnormal pixel values to obtain a second preprocessing image, wherein the second preprocessing image is used as an initial image of a material to be analyzed for subsequent input.
10. The method for integrated online detection of coarse and medium running in a coal preparation plant according to claim 9, wherein S22 comprises:
s221, extracting color, size and texture characteristics of an initial image of the material to be analyzed as extracted image characteristics;
s222, taking the extracted image features and the inductance value detection data as inputs, and respectively using a random forest, a support vector machine and a neural network model to establish a relation model between the three inputs and the material grain distribution in the initial image of the material to be analyzed;
s223, giving three relation models with different weights to establish a mixed model, and taking the output of the mixed model as the final output of the size distribution of materials in an original image;
s224, judging whether the rough running is performed or not according to the second threshold value obtained through setting, and triggering an alarm when the rough running is performed.
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