CN116374553A - Belt conveyor process material distribution positioning method - Google Patents

Belt conveyor process material distribution positioning method Download PDF

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Publication number
CN116374553A
CN116374553A CN202310471712.0A CN202310471712A CN116374553A CN 116374553 A CN116374553 A CN 116374553A CN 202310471712 A CN202310471712 A CN 202310471712A CN 116374553 A CN116374553 A CN 116374553A
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Prior art keywords
belt conveyor
belt
flow
data
plc
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Inventor
惠先刚
王怀军
赵焕章
王鹿利
张子超
吴传辉
李明
杨天明
赵永龙
孙峥
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Tangshan Caofeidian Shiye Port Co ltd
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Tangshan Caofeidian Shiye Port Co ltd
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Priority to CN202310471712.0A priority Critical patent/CN116374553A/en
Publication of CN116374553A publication Critical patent/CN116374553A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G43/00—Control devices, e.g. for safety, warning or fault-correcting
    • B65G43/08—Control devices operated by article or material being fed, conveyed or discharged
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G15/00—Conveyors having endless load-conveying surfaces, i.e. belts and like continuous members, to which tractive effort is transmitted by means other than endless driving elements of similar configuration
    • B65G15/30—Belts or like endless load-carriers
    • B65G15/32—Belts or like endless load-carriers made of rubber or plastics
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G2201/00—Indexing codes relating to handling devices, e.g. conveyors, characterised by the type of product or load being conveyed or handled
    • B65G2201/04—Bulk
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G2203/00—Indexing code relating to control or detection of the articles or the load carriers during conveying
    • B65G2203/02—Control or detection
    • B65G2203/0208—Control or detection relating to the transported articles
    • B65G2203/0258—Weight of the article
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G2203/00—Indexing code relating to control or detection of the articles or the load carriers during conveying
    • B65G2203/02—Control or detection
    • B65G2203/0266—Control or detection relating to the load carrier(s)
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G2203/00—Indexing code relating to control or detection of the articles or the load carriers during conveying
    • B65G2203/04—Detection means
    • B65G2203/042—Sensors
    • 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • 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
    • Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Conveyors (AREA)

Abstract

The invention relates to the technical field of belt conveyor material positioning, in particular to a belt conveyor flow material distribution positioning method, which is used for performing square grid treatment on materials conveyed by a belt conveyor; in the process of the belt conveyor, performing square check treatment on a bearing hopper between an upstream belt and a downstream belt; setting a pulse ranging mode; establishing a data module of each belt conveyor and each funnel in the PLC, and forming a data chain according to the flow path; driving the belt conveyor and the hopper module to flow data in the PLC; when the belt conveyor process is started and stopped in heavy load, the flow of the belt conveyor module data is driven in a pulse ranging mode; tracking the carrying capacity of the belt conveyor material in real time; judging the blank time length of the belt conveyor; and pre-judging a stub bar generated when the belt conveyor process is restarted. The invention can track the material bearing capacity of each belt conveyor in real time, judge the empty material time and the material position of the belt conveyor, and improve the running stability of the flow of the belt conveyor by monitoring and controlling the distribution of the material bearing capacity.

Description

Belt conveyor process material distribution positioning method
Technical Field
The invention relates to the technical field of belt conveyor material positioning, in particular to a belt conveyor flow material distribution positioning method.
Background
In industries such as manufacturing, transportation and metallurgy, a belt conveyor is basically used for conveying bulk cargo raw materials, a belt scale is arranged for dynamically weighing the materials, and when the bulk cargo raw materials are conveyed to different places or the conveying distance is long, a plurality of belts are usually required to cooperatively operate to form a belt conveyor flow.
In the process of the belt conveyor, the material flows fast along with the belt conveyor, the distribution distance is long, the number of the bearing nodes is large, but the requirements on the continuity between the belt conveyors are very high, and the control is not easy. The influence of the load of the hoisting materials on the flow of the belt conveyor mainly comprises the following three aspects: firstly, the material flow rate at part of the belt conveyor exceeds the load capacity, namely the material head is commonly referred to, so that impact can be generated on the whole belt conveyor flow, and overload shutdown and material sprinkling phenomena are caused; secondly, due to the dynamic characteristic of the flow of the belt conveyor, materials can be conveyed step by step, and in the start-stop stage of the flow, long-time idle load phenomenon is easy to generate, so that energy waste is caused, and material backlog is easy to cause, so that a stub bar is generated; thirdly, the belt is deviated, torn and other faults caused by the change of the load of the materials, so that a method for distributing and positioning the materials in the process of the belt conveyor is developed.
Disclosure of Invention
In order to solve the technical problems, the invention provides a material distribution positioning method for a belt conveyor process, which can track the material bearing capacity of each belt conveyor in real time, judge the empty material time of the belt conveyor, and study the linkage relation between the material position and related equipment of the belt conveyor, and improve the running stability of the belt conveyor process by monitoring and controlling the distribution of the material load.
The invention adopts the following technical scheme:
a belt conveyor process material distribution positioning method comprises the following steps:
1) And (3) performing square grid treatment on the materials conveyed by the belt conveyor:
in a process consisting of a plurality of belt conveyors, the speed of the belt conveyors is V when the belt conveyors stably run, the running distance is S within a fixed time T, and therefore each belt in the belt conveyor process is divided into continuous square grids with the length of S, and the tail length of each belt is less than S and is rounded into an integer grid;
the belt conveyor where the material source is located is provided with a belt scale, the weight of the material in each square grid is M, namely the time length of the belt conveyor for stably operating each square grid is T, the length of the corresponding belt square grid is S, and the weight of the material in each square grid is M;
when the belt conveyor runs stably, the material flows through all the downstream square grids at a constant speed until the tail end of the flow of the belt conveyor; the weight of the material in the square lattice of each belt extends from M0 of the initial blanking position of the belt to Mn of the tail end of the belt conveyor;
2) In the belt conveyor process, the process of square grid treatment is carried out on a bearing hopper between an upstream belt and a downstream belt:
the throwing time of the materials in each funnel is td, the fall in the funnel is h, when the belt conveyor runs stably, the time length is T, the materials in the funnel are divided into td/T square grids, and the number of rounding-up processing sides is taken as a certificate, so that the weight of the materials in the funnel is continued from Md0 at the tail end of an upstream belt to Mdn at the blanking point of a downstream belt conveyor;
3) Setting a pulse ranging mode, and when the belt conveyor is restarted and stopped, conveying distances are as follows:
the method comprises the steps that an induction piece is arranged on a central shaft of a driven roller of each belt conveyor, a proximity switch is arranged on the outer side of the driven roller, the proximity switch is connected with a PLC, when the driven roller rotates, the proximity switch generates pulse signals to the PLC when the induction piece passes through the proximity switch, the induction duration is Ta, the non-induction duration is Tb, when the PLC receives two continuous pulse signals, the driven roller with the radius Rc runs for one circle, the corresponding belt conveyor running distance is C=2pi Rc, when the belt conveyor is restarted and stopped, the PLC receives two continuous pulse signals, the belt running distance is accumulated for a length C, and each running distance S is divided into 1 square lattice;
4) Data modules of each belt conveyor and each hopper are established in the PLC, and a data chain is formed according to a flow path:
calculating the number of the grid squares after formatting according to the belt conveyor and funnel structure drawing, establishing data blocks with corresponding grid numbers in the PLC according to the material flow direction, and automatically loading and unloading data for each belt conveyor and funnel module by the PLC according to the starting flow number when the belt conveyor flow is started;
5) Driving the belt conveyor and hopper module data flow in the PLC:
when the belt conveyor runs stably, the PLC drives data to flow at fixed time T, and data of all the belt conveyors and the funnel modules in the process are pushed forward for one grid at intervals of time T; the data flow of the funnel module is continuously driven by time T, and the internal grid data flows from the first grid to the last grid of the funnel;
6) When the belt conveyor process is started and stopped in heavy load, the flow of the belt conveyor module data is driven in a pulse ranging mode:
calculating the belt running distance according to the pulse number of a proximity switch on the current belt conveyor, enabling data to flow forwards for 1 grid when the length S of 1 grid is reached, accumulating the remaining length under the current pulse number to be within the distance corresponding to the next continuous pulse, and enabling the belt conveyor data to flow in an integer square mode;
7) When the data flow of the belt conveyor module is switched between a heavy-load start-stop state and a stable operation state, when the PLC receives 6 continuous pulse signals of the proximity switch, the driven roller with the radius Rc operates for 5 periods, the used time is Tc, the average speed of the belt is Vp=10pi Rc/Tc at the moment, if Vp reaches 95% of the normal stable operation speed V of the belt conveyor, the belt conveyor is regarded as being stably operated, the data flow is driven by a fixed time T, if the belt conveyor is disconnected or Vp is lower than 90% of the normal speed V, the belt conveyor is regarded as being in the heavy-load start-stop state, the data flow is driven by a pulse ranging mode, and if Vp is between 90% and 95%, the original state is kept, and the data flow is not switched;
8) Tracking the material bearing capacity of the belt conveyor in real time, and judging the blank duration of the belt conveyor:
calculating the total weight of materials of each square lattice in each data module in real time in a PLC, wherein Mz=M0+M1+ … +Mn, mdz =Md0+Md1+ … + Mdn, wherein Mz and Mdz are the current material load quantities of the corresponding belt conveyor or hopper, and calculating overload quantity or idle time according to the threshold value of the upper limit and the lower limit of the rated load capacity of the belt conveyor;
9) Prejudging a stub bar generated when the belt conveyor process is restarted:
after the heavy load is stopped, calculating the weight of the material of the last grid of each funnel module in the PLC, and if the weight of the material fully loaded by a single grid of the belt conveyor is exceeded, leading a material head with a certain length to exist when the downstream belt conveyor is restarted;
after the material head appears at the flow source of the belt conveyor or at the tail end of each funnel, the time of the material head reaching a specific device can be estimated to be Tn=N x T when the belt conveyor stably operates by calculating the total square number N of the belt conveyor and the funnel module between the material head and downstream devices, so that countermeasures are collected in advance.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, the belt and the hopper are divided into the single square grids to track the bearing capacity of the materials on each belt conveyor in real time, the belt conveyor running condition PLC is utilized to switch different modes to drive data to flow, the relation between the belt conveyor empty time, the material position and the related equipment of the belt conveyor can be accurately judged, the load capacity of the materials can be effectively monitored and controlled, and the stability of the belt conveyor flow is improved.
Further, the invention adopts the following preferable scheme:
the arc length of the sensing piece is L, the radius of the sensing piece is R, the delay time Ty of the digital quantity input hardware of the proximity switch, the delay time Tr of the PLC software and the scanning period Ts of the PLC are set as follows, so that each sensing pulse can be identified by the PLC, and the requirements are met
Ta≥2*（Ts+Ty+Tr），Tb>（Ts+Ty+Tr）
The relation between the arc length L, the radius R and the driven radius roller Rc of the induction sheet is as follows:
L=Ta*V*R/Rc。
drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate and together with the description serve to explain the invention. In the drawings:
FIG. 1 is a schematic view of the material flow direction of a belt conveyor;
FIG. 2 is a schematic view of the funnel material flow direction;
FIG. 3 is a schematic diagram of a proximity switch versus a PLC generated pulse signal;
FIG. 4 is a flow chart of a pulse ranging mode switch;
FIG. 5 is a schematic diagram of successive pulse times;
in the figure: a driven roller 1; an induction sheet 2; and a proximity switch 3.
Detailed Description
The present invention will be described in further detail with reference to the following embodiments and the accompanying drawings, in order to make the objects, technical solutions and advantages of the present invention more apparent. The exemplary embodiments of the present invention and the descriptions thereof are used herein to explain the present invention, but are not intended to limit the invention.
A belt conveyor process material distribution positioning method comprises the following steps:
1) And (3) performing square grid treatment on the materials conveyed by the belt conveyor:
in a process consisting of a plurality of belt conveyors, the speed of the belt conveyors during stable operation is V, the operation distance in a fixed time T is S, and therefore each belt in the belt conveyor process is divided into continuous square grids with the length of S, and the tail length of each belt is less than the length of S and is rounded into an integer grid.
The belt conveyor where the material source is located is provided with a belt scale, the weight of the material in each square grid is M, namely the time length of the belt conveyor for stably operating each square grid is T, the length of the corresponding belt square grid is S, and the weight of the material in each square grid is M;
when the belt conveyor runs stably, the material flows through all the downstream square grids at a constant speed until the tail end of the flow of the belt conveyor; the weight of the material in each of the belt squares continues from M0 at the initial blanking position of the belt to Mn at the end of the belt conveyor (as shown in fig. 1).
The resolution of the formatting of the belt conveyor materials and the number of the corresponding data of the single belt conveyor are determined by T and S, and the distance of the longest belt conveyor in the belt conveyor flow is determined.
In this example, the belt speed of the belt conveyor was 3.8m/s, the rated conveying capacity was 7200 tons/hour, the longest belt conveyor in the belt flow was 1500m, and T was 0.5s and S was 1.9m.
2) In the belt conveyor process, the process of square grid treatment is carried out on a bearing hopper between an upstream belt and a downstream belt:
the material is thrown in each funnel for time td, the fall in the funnel is h, the time length is T when the belt conveyor is stably operated, the material in the funnel is divided into td/T square grids, and the number of rounding-up processing sides is used as a certificate, so that the weight of the material in the funnel is continued from Md0 at the tail end of an upstream belt to Mdn at the blanking point of a downstream belt conveyor (shown in fig. 2).
3) Setting a pulse ranging mode, and when the belt conveyor is restarted and stopped, conveying distances are as follows:
the induction piece 2 is arranged on the central shaft of the driven roller 1 of each belt conveyor, the proximity switches 3 are arranged on the outer side of the driven roller 1, all the proximity switches 3 are connected with the PLC, when the driven roller 1 rotates, the induction piece passes through the proximity switches 3, the proximity switches 3 generate pulse signals to the PLC, the induction duration is Ta, the non-induction duration is Tb, when the PLC receives two continuous pulse signals (as shown in fig. 5), the driven roller 1 with the radius Rc runs for one circle, the corresponding belt conveyor running distance is C=2pi Rc, and when the belt conveyor is restarted and stopped, the PLC receives two continuous pulse signals, the belt running distance is accumulated for the length C, and the running distance S is divided into 1 square lattice.
The arc length of the sensing piece 2 is L, the radius of the sensing piece 2 is R, the delay time Ty of the digital quantity input hardware of the proximity switch 3, the delay time Tr of the PLC software and the scanning period Ts of the PLC are all equal to each other, so that each sensing pulse can be identified by the PLC, and the requirements are met
Ta≥2*（Ts+Ty+Tr），Tb>（Ts+Ty+Tr）。
The relation between the arc length L, the radius R and the driven radius roller Rc of the induction piece 2 is as follows:
L=Ta*V*R/Rc。
in this embodiment, ts+ty+tr=12ms, and all belt conveyors use a sensing piece of l=100mm and r=rc=300mm in a unified manner.
4) Data modules of each belt conveyor and each hopper are established in the PLC, and a data chain is formed according to a flow path:
setting a data flow path for each belt conveyor in the PLC, butting the data flow directions of the belt conveyor modules and the funnel modules to form a data chain, calculating the number of grid squares after formatting according to the belt conveyor and funnel structure drawings, establishing data blocks with corresponding grid numbers in the PLC according to the material flow direction, and automatically loading and unloading data for each belt conveyor and funnel module according to the starting flow number by the PLC when the belt conveyor flow is started.
5) Driving the belt conveyor and hopper module data flow in the PLC:
when the belt conveyor runs stably, the PLC drives data to flow at fixed time T, and data of all the belt conveyors and the funnel modules in the process are pushed forward for one grid at intervals of time T; taking t=0.5 s as an example, calculating an increment value of the accumulated amount of the belt scale every 0.5 seconds, taking the increment value as a weight value M of materials in the current square lattice, storing the weight value M into the square lattice of a flow data chain of the belt conveyor, and pushing the whole data chain to flow from square lattice to square lattice.
The data flow of the funnel module is continuously driven by time T, internal grid data flows from the first grid to the last grid of the funnel, when the flow of the belt conveyor is started and stopped in a heavy load mode, if the flow speed of downstream belt data is lower than that of upstream belt data, the data are accumulated to the last grid of the funnel, and when the downstream belt data of the funnel flow, the last grid of the funnel can only output the full material weight of a single grid of the belt conveyor at most each time until the material weight value in the last grid of the funnel is lower than the full material weight value. For example, when a single square grid of the belt conveyor is fully loaded, the corresponding material weight is 2 tons, and after the rear grid of the hopper is piled up by the upstream belt conveyor material data, the weight is reduced by 2 tons each time along with the downstream belt data flowing by 1 grid until the weight is less than 2 tons.
6) When the belt conveyor process is started and stopped in heavy load, the flow of the belt conveyor module data is driven in a pulse ranging mode:
calculating the belt running distance according to the pulse number of a proximity switch on the current belt conveyor, enabling data to flow forwards for 1 grid when the length S of 1 grid is reached, accumulating the remaining length under the current pulse number to be within the distance corresponding to the next continuous pulse, and enabling the belt conveyor data to flow in an integer square mode;
for example, the belt speed of the belt conveyor is 3.8m/S, t=0.5S, s=1.9 m, each time the sensor chip senses with the proximity switch to generate an ascending pulse signal, the measuring belt running distance is 1.885m, after the plc receives two pulse signals, the data of the belt conveyor flows forward by 1 grid, the corresponding belt running distance is 1.9m, the remaining amount is 1.87m, the distance corresponding to the next pulse is combined to 1 grid, the remaining amount of 1.855m generated by the next pulse is combined with the distance corresponding to the next pulse, and so on.
7) When the data flow of the belt conveyor module is switched between the heavy-load start-stop state and the stable operation state, the PLC receives 6 continuous pulse signals of the proximity switch, the driven roller with the radius Rc operates for 5 periods, the used time is Tc, the average speed of the belt is Vp=10pi Rc/Tc at the moment, if Vp reaches 95% of the normal stable operation speed V of the belt conveyor, the belt conveyor is regarded as being stably operated, the data flow is driven by the fixed time T, if the belt conveyor is disconnected or Vp is lower than 90% of the normal speed V, the belt conveyor is regarded as being in the heavy-load start-stop state, the data flow is driven by the pulse ranging mode, and if Vp is between 90% and 95%, the original state is kept, and the data flow is not switched.
8) Tracking the material bearing capacity of the belt conveyor in real time, and judging the blank duration of the belt conveyor:
and calculating the total weight of materials of each square lattice in each data module in real time in the PLC, wherein Mz=M0+M1+ … +Mn, mdz =Md0+Md1+ … + Mdn, wherein Mz and Mdz are the current material load quantities of the corresponding belt conveyor or hopper, and the overload quantity or the dead time is calculated according to the threshold value of the upper limit and the lower limit of the rated load capacity of the belt conveyor.
9) Prejudging a stub bar generated when the belt conveyor process is restarted:
after the heavy load is stopped, calculating the weight of the material of the last grid of each funnel module in the PLC, and if the weight of the material fully loaded by a single grid of the belt conveyor is exceeded, leading a material head with a certain length to exist when the downstream belt conveyor is restarted;
after the material head appears at the flow source of the belt conveyor or at the tail end of each funnel, the time of the material head reaching a specific device can be estimated as Tn=N×T when the belt conveyor stably operates by calculating the total square number N of the belt conveyor and the funnel module between the material head and downstream devices;
for the non-fault shutdown belt conveyor in the process, the downstream belt conveyor is delayed to shut down according to pulse ranging and material distribution, and the upstream part of materials are conveyed to the belt conveyor with higher downstream load power, so that overload of the trolley low-power belt conveyor and overflow of related small-capacity funnel materials are avoided.
In the above embodiment, after each belt conveyor calculates the theoretical length by pulse counting, the data is compared with the length calculated by timing in the steady operation state, and the check sum corrects the distance between the belt conveyors corresponding to the single pulse; when the belt conveyor process is rerun, the object is thrown from the belt scale installation position, the time nodes of the object reaching each belt conveyor and hopper are respectively recorded, the time nodes are compared with the theoretical time of the established PLC process data chain, and the speed value of the PLC driving data flow is checked and corrected.
The foregoing description is only of the preferred embodiments of the present invention and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.

Claims (2)

1. The belt conveyor process material distribution positioning method is characterized by comprising the following steps:
1) And (3) performing square grid treatment on the materials conveyed by the belt conveyor:
in a process consisting of a plurality of belt conveyors, the speed of the belt conveyors is V when the belt conveyors stably run, the running distance is S within a fixed time T, and therefore each belt in the belt conveyor process is divided into continuous square grids with the length of S, and the tail length of each belt is less than S and is rounded into an integer grid;
the belt conveyor where the material source is located is provided with a belt scale, the weight of the material in each square grid is M, namely the time length of the belt conveyor for stably operating each square grid is T, the length of the corresponding belt square grid is S, and the weight of the material in each square grid is M;
when the belt conveyor runs stably, the material flows through all the downstream square grids at a constant speed until the tail end of the flow of the belt conveyor; the weight of the material in the square lattice of each belt extends from M0 of the initial blanking position of the belt to Mn of the tail end of the belt conveyor;
2) In the belt conveyor process, the process of square grid treatment is carried out on a bearing hopper between an upstream belt and a downstream belt:
the throwing time of the materials in each funnel is td, the fall in the funnel is h, when the belt conveyor runs stably, the time length is T, the materials in the funnel are divided into td/T square grids, and the number of rounding-up processing sides is taken as a certificate, so that the weight of the materials in the funnel is continued from Md0 at the tail end of an upstream belt to Mdn at the blanking point of a downstream belt conveyor;
3) Setting a pulse ranging mode, and when the belt conveyor is restarted and stopped, conveying distances are as follows:
the method comprises the steps that an induction piece is arranged on a central shaft of a driven roller of each belt conveyor, a proximity switch is arranged on the outer side of the driven roller, the proximity switch is connected with a PLC, when the driven roller rotates, the proximity switch generates pulse signals to the PLC when the induction piece passes through the proximity switch, the induction duration is Ta, the non-induction duration is Tb, when the PLC receives two continuous pulse signals, the driven roller with the radius Rc runs for one circle, the corresponding belt conveyor running distance is C=2pi Rc, when the belt conveyor is restarted and stopped, the PLC receives two continuous pulse signals, the belt running distance is accumulated for a length C, and each running distance S is divided into 1 square lattice;
4) Data modules of each belt conveyor and each hopper are established in the PLC, and a data chain is formed according to a flow path:
calculating the number of the grid squares after formatting according to the belt conveyor and funnel structure drawing, establishing data blocks with corresponding grid numbers in the PLC according to the material flow direction, and automatically loading and unloading data for each belt conveyor and funnel module by the PLC according to the starting flow number when the belt conveyor flow is started;
5) Driving the belt conveyor and hopper module data flow in the PLC:
when the belt conveyor runs stably, the PLC drives data to flow at fixed time T, and data of all the belt conveyors and the funnel modules in the process are pushed forward for one grid at intervals of time T; the data flow of the funnel module is continuously driven by time T, and the internal grid data flows from the first grid to the last grid of the funnel;
6) When the belt conveyor process is started and stopped in heavy load, the flow of the belt conveyor module data is driven in a pulse ranging mode:
calculating the belt running distance according to the pulse number of a proximity switch on the current belt conveyor, enabling data to flow forwards for 1 grid when the length S of 1 grid is reached, accumulating the remaining length under the current pulse number to be within the distance corresponding to the next continuous pulse, and enabling the belt conveyor data to flow in an integer square mode;
7) When the data flow of the belt conveyor module is switched between a heavy-load start-stop state and a stable operation state, when the PLC receives 6 continuous pulse signals of the proximity switch, the driven roller with the radius Rc operates for 5 periods, the used time is Tc, the average speed of the belt is Vp=10pi Rc/Tc at the moment, if Vp reaches 95% of the normal stable operation speed V of the belt conveyor, the belt conveyor is regarded as being stably operated, the data flow is driven by a fixed time T, if the belt conveyor is disconnected or Vp is lower than 90% of the normal speed V, the belt conveyor is regarded as being in the heavy-load start-stop state, the data flow is driven by a pulse ranging mode, and if Vp is between 90% and 95%, the original state is kept, and the data flow is not switched;
8) Tracking the material bearing capacity of the belt conveyor in real time, and judging the blank duration of the belt conveyor:
calculating the total weight of materials of each square lattice in each data module in real time in a PLC, wherein Mz=M0+M1+ … +Mn, mdz =Md0+Md1+ … + Mdn, wherein Mz and Mdz are the current material load quantities of the corresponding belt conveyor or hopper, and calculating overload quantity or idle time according to the threshold value of the upper limit and the lower limit of the rated load capacity of the belt conveyor;
9) Prejudging a stub bar generated when the belt conveyor process is restarted:
after the heavy load is stopped, calculating the weight of the material of the last grid of each funnel module in the PLC, and if the weight of the material fully loaded by a single grid of the belt conveyor is exceeded, leading a material head with a certain length to exist when the downstream belt conveyor is restarted;
after the material head appears at the flow source of the belt conveyor or at the tail end of each funnel, the time of the material head reaching a specific device can be estimated to be Tn=N x T when the belt conveyor stably operates by calculating the total square number N of the belt conveyor and the funnel module between the material head and downstream devices, so that countermeasures are collected in advance.
2. The belt conveyor process material distribution positioning method according to claim 2, wherein: the arc length of the sensing piece is L, the radius of the sensing piece is R, the delay time Ty of the digital quantity input hardware of the proximity switch, the delay time Tr of the PLC software and the scanning period Ts of the PLC are set as follows, so that each sensing pulse can be identified by the PLC, and the requirements are met
Ta≥2*（Ts+Ty+Tr），Tb>（Ts+Ty+Tr）
The relation between the arc length L, the radius R and the driven radius roller Rc of the induction sheet is as follows:
L=Ta*V*R/Rc。
CN202310471712.0A 2023-04-27 2023-04-27 Belt conveyor process material distribution positioning method Pending CN116374553A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117886081A (en) * 2024-03-14 2024-04-16 山西森尔科技有限公司 Belt conveyor fault monitoring method and device, electronic equipment and medium

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117886081A (en) * 2024-03-14 2024-04-16 山西森尔科技有限公司 Belt conveyor fault monitoring method and device, electronic equipment and medium

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