CN111663959A - Intelligent speed regulating system and method for coal stream transportation of underground fully mechanized caving face of coal mine - Google Patents
Intelligent speed regulating system and method for coal stream transportation of underground fully mechanized caving face of coal mine Download PDFInfo
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- CN111663959A CN111663959A CN202010376731.1A CN202010376731A CN111663959A CN 111663959 A CN111663959 A CN 111663959A CN 202010376731 A CN202010376731 A CN 202010376731A CN 111663959 A CN111663959 A CN 111663959A
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F13/00—Transport specially adapted to underground conditions
- E21F13/06—Transport of mined material at or adjacent to the working face
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C35/00—Details of, or accessories for, machines for slitting or completely freeing the mineral from the seam, not provided for in groups E21C25/00 - E21C33/00, E21C37/00 or E21C39/00
- E21C35/20—General features of equipment for removal of chippings, e.g. for loading on conveyor
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D23/00—Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor
- E21D23/12—Control, e.g. using remote control
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F13/00—Transport specially adapted to underground conditions
- E21F13/06—Transport of mined material at or adjacent to the working face
- E21F13/063—Loading devices for use in mining
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
- E21F17/18—Special adaptations of signalling or alarm devices
Abstract
The invention discloses an intelligent speed regulating system and method for coal stream transportation of a fully mechanized caving face of an underground coal mine, which are used for controlling the operating frequencies of a front scraper conveyor, a rear scraper conveyor and a reversed loader of fully mechanized caving face transportation equipment of a coal mining machine.
Description
Technical Field
The invention relates to the field of coal stream transportation of a fully mechanized caving face of an underground coal mine, in particular to an intelligent speed regulating system and method for coal stream transportation of the fully mechanized caving face of the underground coal mine.
Background
In the underground coal mine fully mechanized caving face, a front scraper conveyor, a rear scraper conveyor and a reversed loader are used as main underground coal mine transportation equipment, and the automation degree of the underground coal mine fully mechanized caving face determines the coal transportation efficiency. During the coal flow transportation process of the underground coal mine fully mechanized caving working face, firstly, a coal mining machine walking on a front scraper conveyor cuts the coal wall on the front side of the coal mining machine, cut coal blocks fall into the front scraper conveyor and are transported to a reversed loader by the front scraper conveyor, meanwhile, a hydraulic support carries out caving coal through a tail beam, and the laid coal blocks fall into a rear scraper conveyor and are transported to the reversed loader by the rear scraper conveyor; the coal is then transported by the transfer conveyor to a belt conveyor, which transports the coal to the ground. In the process, due to the fact that rated powers of the front scraper conveyor, the rear scraper conveyor and the reversed loader are limited, the front scraper conveyor, the rear scraper conveyor or the reversed loader are shut down and stop working due to the overload phenomenon caused by the overload coal flow, and the running efficiency of the coal flow under the coal mine and the production efficiency of coal are seriously affected.
The driving motors of the front scraper conveyor, the rear scraper conveyor and the reversed loader of the underground fully mechanized caving face transportation equipment of the coal mine are controlled by a frequency converter, and the working modes of the three kinds of equipment respectively have two working modes: an operating frequency mode and a frequency conversion mode. In the power frequency mode, the transport equipment is operated at a constant rated operating frequency, regardless of whether the load is light or overloaded. If the load is light load, the work done by the equipment is far more than that done by the load, which causes waste of power resources; if the load is overloaded, the work done by the equipment is far less than that done by the load, the equipment is stopped or damaged due to overload, and further the coal flow transportation efficiency of the underground fully mechanized caving face of the coal mine is influenced, and the coal production is influenced. Under the frequency conversion mode, the operation frequency of the equipment is controllable and adjustable, and is adjusted according to the load transported by the equipment, so that the work done by the equipment and the work done by the load are approximately balanced, that is, the continuous work of the equipment without stopping is ensured, and the power energy is saved.
Most domestic coal mines still rely on manual mode to carry out frequency conversion adjustment to the front scraper conveyor, the rear scraper conveyor and the reversed loader according to load, or make equipment work under the power frequency mode. Due to the fact that working conditions of the underground fully-mechanized caving face of the coal mine are complex and changeable and the experience of workers is different, accurate frequency conversion adjustment of transportation equipment is difficult to carry out. Therefore, no matter the fully mechanized caving face transportation equipment is subjected to frequency conversion adjustment in a manual mode in a frequency conversion mode, or is directly operated at a constant frequency in a power frequency mode, the power capacity waste can be caused, and the transportation efficiency of underground coal flow and the coal production efficiency can be influenced.
Disclosure of Invention
Aiming at the technical defects, the invention provides an intelligent speed regulating system for coal stream transportation of a fully mechanized caving face in a coal mine well, which takes the load current values of three transportation devices as reference and adjusts the operation frequency of the three transportation devices in a coordinated manner, so that each transportation device can operate at a proper operation frequency to match and balance the respective transportation load, thereby realizing continuous operation of the transportation devices without interruption and stopping, and improving the coal stream transportation efficiency and the coal production efficiency.
In order to solve the technical problems, the invention adopts the following technical scheme:
the invention provides an intelligent speed regulation method for coal stream transportation of a fully mechanized caving face of an underground coal mine, which is used for controlling the operation frequency of a front scraper conveyor, a rear scraper conveyor and a reversed loader of fully mechanized caving face transportation equipment of a coal mining machine and specifically comprises the following steps:
after the elevating conveyor is started, acquiring and judging the running current value of the elevating conveyor, obtaining the running state of the elevating conveyor according to the proportional relation between the running current of the elevating conveyor and the rated current, and sending request signals to the front scraper conveyor and the rear scraper conveyor by combining the working state of the coal mining machine;
after the front scraper conveyor is started, collecting and judging the running current value of the front scraper conveyor, and carrying out corresponding speed increasing and reducing according to the request signal of the reversed loader;
and after the rear scraper conveyor is started, acquiring and judging the running current value of the rear scraper conveyor, and performing corresponding speed increase and reduction according to the request signal of the reversed loader.
Preferably, the rear scraper conveyor is also provided with a hydraulic support, and the hydraulic support carries out coal discharge speed regulation according to the request of the reversed loader;
when the hydraulic support is requested to release coal and decelerate, if the number of the coal releasing ports is more than 1, reducing 1 coal releasing port for releasing coal for 5 seconds, otherwise, reducing 50 percent of the size of the coal releasing ports for releasing coal for 5 seconds for 1 coal releasing port;
when the hydraulic support is requested to discharge coal and increase the speed, if the number of the coal discharge ports is less than 3, 1 coal discharge port is added to discharge coal for 5 seconds, and if not, the coal discharge ports are 3 to discharge coal and the current state is kept to perform normal coal discharge.
Preferably, after the elevating conveyor is started:
if the running current of the reversed loader is less than 50% of the rated current, the reversed loader keeps the current state to continue running, the load state of the reversed loader is judged after 10 seconds, if the reversed loader does not carry out underload, the reversed loader continues running for 10 seconds, and if the reversed loader carries out underload, the states of the coal mining machine and the hydraulic support are judged; if the coal cutter is cutting coal, the front scraper conveyor is requested to be accelerated, otherwise the elevating conveyor is operated by 5 percent; if the hydraulic support is discharging coal, the rear scraper conveyor is requested to be accelerated, otherwise the elevating conveyor is operated by 5 percent;
if the running current of the reversed loader is more than or equal to 50% of the rated current and less than 150% of the rated current, the reversed loader is in a normal load working state and keeps running in the normal load working state until the reversed loader is stopped running when regular maintenance is needed;
if the running current of the reversed loader is more than or equal to 150% of the rated current and less than 200% of the rated current, the current state is kept to continue running, the loading state of the reversed loader is judged after 10 seconds, if the reversed loader is not overloaded, the reversed loader continues running for 10 seconds, and if the reversed loader is overloaded, the states of the coal mining machine and the hydraulic support are judged; if the coal mining machine is cutting coal, the front scraper conveyor is requested to decelerate, otherwise the elevating conveyor operates at the speed reduction of 5%; if the hydraulic support is discharging coal, requesting the rear scraper conveyor to decelerate, otherwise, operating the reversed loader at the speed reduced by 5%;
if the running current of the reversed loader is more than or equal to 200% of the rated current, the reversed loader is kept running in the current state, the loaded state of the reversed loader is judged after 5 seconds, if the reversed loader is not overloaded, the reversed loader is continuously run for 5 seconds, and if the reversed loader is overloaded, the front scraper conveyor, the rear scraper conveyor and the reversed loader are stopped running.
Preferably, after the front scraper conveyor is started:
when the reversed loader requests to decelerate, if the running speed of the front scraper conveyor is the minimum speed, the coal mining machine is requested to decelerate, otherwise, the front scraper conveyor decelerates by 5 percent to run;
when the elevating conveyor requests acceleration, if the running speed of the front scraper conveyor is the maximum speed, the coal mining machine is requested to accelerate, otherwise, the front scraper conveyor is accelerated by 5 percent to run;
if the reversed loader has no request, the front scraper conveyor performs the following actions according to the running current of the front scraper conveyor:
(1) if the running current of the front scraper conveyor is less than 50% of the rated current, the front scraper conveyor keeps running continuously in the current state, the load state of the front scraper conveyor is judged after 10 seconds, if the front scraper conveyor is not underloaded, the front scraper conveyor continues running for 10 seconds, if the front scraper conveyor is underloaded, the coal mining machine is judged to be in the state, if the coal mining machine is cutting coal, the speed of the coal mining machine is required to be increased, otherwise, the front scraper conveyor is reduced by;
(2) if the running current of the front scraper conveyor is more than or equal to 50% of the rated current and less than 150% of the rated current, the front scraper conveyor is in a normal load working state and keeps running in the normal load working state until the front scraper conveyor is stopped running when regular maintenance is needed;
(3) if the running current of the front scraper conveyor is more than or equal to 150% of the rated current and less than 200% of the rated current, the front scraper conveyor keeps running continuously in the current state, the load state of the front scraper conveyor is judged after 10 seconds, if the front scraper conveyor does not overload, the front scraper conveyor continues running for 10 seconds, if the front scraper conveyor overloads, the coal mining machine is judged, if the coal mining machine is cutting coal, the coal mining machine is requested to decelerate, and if the front scraper conveyor does not accelerate by 5% to run;
(4) if the running current of the front scraper conveyor is more than or equal to 200% of the rated current, the front scraper conveyor is kept running in the current state, the load state is judged after 5 seconds, if the front scraper conveyor is not overloaded, the front scraper conveyor is continuously run for 5 seconds, and if the front scraper conveyor is overloaded, the front scraper conveyor is stopped running.
Preferably, after the rear scraper conveyor is started:
when the reversed loader requests to decelerate, if the running speed of the rear scraper conveyor is the minimum speed, the hydraulic support is requested to discharge coal to decelerate, otherwise, the rear scraper conveyor decelerates by 5 percent to run;
when the elevating conveyor requests acceleration, if the running speed of the rear scraper conveyor is the maximum speed, the hydraulic support is requested to discharge coal and accelerate, otherwise, the rear scraper conveyor accelerates by 5 percent;
when the reversed loader has no request, the rear scraper conveyor performs the following actions according to the running current of the rear scraper conveyor:
(1) if the running current of the rear scraper conveyor is less than 50% of the rated current, the current state of the rear scraper conveyor is kept to continue running, the load state of the rear scraper conveyor is judged after 10 seconds, if the rear scraper conveyor is not underloaded, the rear scraper conveyor continues running for 10 seconds, if the rear scraper conveyor is underloaded, the hydraulic support state is judged, if the hydraulic support is discharging coal, the coal discharging speed is required to be increased, and if the hydraulic support is discharging coal, the rear scraper conveyor is decelerated by 5% to run;
(2) if the running current of the rear scraper conveyor is more than or equal to 50% of the rated current and less than 150% of the rated current, the rear scraper conveyor is in a normal load working state and keeps running in the normal load working state until the rear scraper conveyor is stopped running when regular maintenance is needed;
(3) if the running current of the rear scraper conveyor is more than or equal to 150% of the rated current and less than 200% of the rated current, the rear scraper conveyor keeps running in the current state, the load state of the rear scraper conveyor is judged after 10 seconds, if the rear scraper conveyor is not overloaded, the rear scraper conveyor continues running for 10 seconds, if the rear scraper conveyor is overloaded, the hydraulic support state is judged, if the hydraulic support is discharging coal, the coal is required to be discharged and decelerated, otherwise, the rear scraper conveyor is accelerated by 5% to run;
(4) if the running current of the rear scraper conveyor is more than or equal to 200% of the rated current, the rear scraper conveyor is kept running in the current state, the load state of the rear scraper conveyor is judged after 5 seconds, if the rear scraper conveyor is not overloaded, the rear scraper conveyor is continuously run for 5 seconds, and if the rear scraper conveyor is overloaded, the rear scraper conveyor is stopped running.
The invention also provides an intelligent speed regulating system for coal stream transportation of the underground fully mechanized caving face of the coal mine, which comprises a reversed loader coal stream intelligent speed regulating unit, a front scraper conveyor coal stream intelligent speed regulating unit and a rear scraper conveyor coal stream intelligent speed regulating unit;
the intelligent speed regulating unit for the coal flow of the reversed loader is used for controlling the running speed of the reversed loader;
the intelligent coal flow speed regulating unit of the front scraper conveyor is used for controlling the running speed of the front scraper conveyor;
the intelligent coal flow speed regulating unit of the rear scraper conveyor is used for controlling the running speed of the rear scraper conveyor.
Preferably, the intelligent coal flow speed regulating unit of the rear scraper conveyor comprises a hydraulic support coal discharge speed regulating subunit for controlling the running speed of the hydraulic support.
Preferably, the elevating conveyor coal flow intelligent speed regulating unit obtains the running state of the elevating conveyor according to the proportional relation between the running current of the elevating conveyor and the rated current, and sends request signals to the front scraper conveyor coal flow intelligent speed regulating unit and the rear scraper conveyor coal flow intelligent speed regulating unit by combining the working state of the coal mining machine;
the intelligent coal flow speed regulating unit of the front scraper conveyor and the intelligent coal flow speed regulating unit of the rear scraper conveyor collect and judge the running current values of the front scraper conveyor and the rear scraper conveyor, and perform corresponding speed increasing and reducing according to the request signal of the reversed loader.
The invention has the beneficial effects that:
(1) the invention improves the automation degree of the fully mechanized caving face, reduces the number of workers on the fully mechanized caving face, ensures the safe mining of the fully mechanized caving face and realizes the coal mining strategy goal of increasing safety and few people.
(2) The invention improves the coal mining efficiency of the fully mechanized caving face, increases the coal mine production benefit, saves the power energy of the coal mine underground equipment at the same time, and realizes the green mining of coal.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without any creative effort.
FIG. 1 is a flow chart of an intelligent speed regulating method for coal flow of a fully mechanized caving face transfer conveyor of the invention;
FIG. 2 is a flow chart of an intelligent coal flow speed regulating method for a scraper conveyor at the front of a fully mechanized caving face according to the invention;
FIG. 3 is a flow chart of an intelligent coal flow speed regulating method for a scraper conveyor at the rear part of a fully mechanized caving face according to the invention;
FIG. 4 is a flow chart of the operation of a coal discharge speed regulating subsystem of the hydraulic support of the fully mechanized caving face;
FIG. 5 is a schematic diagram of coal cutting and hydraulic support coal caving of a fully mechanized caving face coal mining machine of the present invention;
FIG. 6 is a schematic diagram of coal flow transportation and flow direction of the fully mechanized caving face transportation equipment of the present invention.
In the figure: 1. the device comprises a coal mining machine 2, a front scraper conveyor 3, a hydraulic support 4, a rear scraper conveyor 5 and a reversed loader.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Examples
The working mode of the fully mechanized caving face transportation equipment (the front scraper conveyer 2, the rear scraper conveyer 4 and the reversed loader 5) in the invention is a frequency conversion working mode, the load current value is taken as a reference, and the running frequency of the three transportation equipment is cooperatively adjusted, so that each transportation equipment runs at a proper running frequency to match and balance each self-transportation load, thereby realizing continuous operation of the transportation equipment without interruption and stopping, and improving the coal flow transportation efficiency and the coal production efficiency. The amount of load transported is reflected by the current of the respective operating motor.
The specific expression that the current can reflect the load size of the transportation equipment is as follows:
Pr＝r·U·I·cosα (1)
in the formula, PrThe input power of the motor of the transportation equipment, r is the number of stator phases, U is the voltage value of the stator (unit V), I is the current value of the stator (unit A), and cos α is the power factor of the stator.
Pm＝F·v/η (2)
In the formula, PmMechanical power for the transport equipment, resistance generated by the load, and transmission efficiency η.
When the transportation equipment on the fully mechanized caving face works, the input power of the motor of the transportation equipment is approximately balanced with the mechanical power of the running equipment, so P is availabler＝PmI.e., I ═ F · v/(η · r · U · cos α).
Fig. 5 to 6 show the coal cutting machine of the fully mechanized caving face of the invention and the coal flow conveying direction of the coal cutting machine on the front scraper conveyor 2, the coal discharging of the hydraulic bracket 3 and the coal flow conveying direction of the coal discharging machine on the rear scraper conveyor 4, and the coal flow conveying direction of the reversed loader 5.
The fully mechanized caving face coal mining machine 1 travels on a front scraper conveyor 2 and cuts coal, the cut coal is transported 2 to a transfer conveyor 5 through the front scraper conveyor, and if the coal cutting amount is large in the process, the front scraper conveyor 2 is overloaded and stops or is damaged; if the coal cutting amount is small, the load of the front scraper conveyor 2 is too small, and power energy is wasted, so that the intelligent speed regulation of the front scraper conveyor 2 is required.
Coal is discharged from the hydraulic support 3 of the fully mechanized caving face, the discharged coal is transported to the reversed loader 5 through the rear scraper conveyor 4, and if the coal discharge amount is large in the process, the rear scraper conveyor 4 is overloaded and stops or is damaged; if the coal discharge amount is small, the load of the rear scraper conveyor 4 is too small, and power energy is wasted, so that the intelligent speed regulation of the rear scraper conveyor 4 is required.
The fully mechanized caving face transfer conveyor 5 conveys coal conveyed by the front scraper conveyor 2 and the rear scraper conveyor 4 to the belt conveyor, and if the coal conveyed by the front scraper conveyor and the rear scraper conveyor is large, the transfer conveyor 5 is overloaded and stops or is damaged; if the amount of coal carried by the front and rear flight conveyors is small, the elevating conveyor 5 is overloaded and the power source is generated, so that the elevating conveyor 5 needs to be intelligently adjusted in speed.
The embodiment of the invention provides an intelligent speed regulation method for coal stream transportation of a fully mechanized caving face of an underground coal mine, which is used for controlling the operating frequencies of a front scraper conveyor 2, a rear scraper conveyor 4 and a reversed loader 5 of fully mechanized caving face transportation equipment of a coal mining machine and specifically comprises the following steps:
after the elevating conveyor 5 is started, acquiring and judging the running current value of the elevating conveyor 5, obtaining the running state of the elevating conveyor 5 according to the proportional relation between the running current of the elevating conveyor 5 and the rated current, and sending request signals to the front scraper conveyor 2 and the rear scraper conveyor 4 by combining the working state of the coal mining machine 1;
after the front scraper conveyor 2 is started, collecting and judging the running current value of the front scraper conveyor, and performing corresponding speed increasing and reducing according to the request signal of the reversed loader 5;
and after the rear scraper conveyor 4 is started, collecting and judging the running current value of the rear scraper conveyor, and performing corresponding speed increasing and reducing according to the request signal of the reversed loader 5.
The rear scraper conveyor 4 is also provided with a hydraulic support 3, and the hydraulic support 3 carries out coal discharge speed regulation according to the request of the reversed loader 5;
referring to fig. 4, when the hydraulic support 3 is requested to discharge coal and decelerate, if the number of the coal discharge ports is more than 1, 1 coal discharge port is reduced for discharging coal for 5 seconds, otherwise, 1 coal discharge port is used for discharging coal, and the size of 50% of the coal discharge ports is reduced for discharging coal for 5 seconds;
when the hydraulic support 3 is requested to discharge coal and increase the speed, if the number of the coal discharge ports is less than 3, 1 coal discharge port is added to discharge coal for 5 seconds, and if not, the coal discharge ports are 3 to discharge coal and the current state is kept to perform normal coal discharge.
Referring to fig. 1, after the reversed loader 5 is started:
if the running current of the reversed loader 5 is less than 50% of the rated current, the reversed loader 5 keeps the current state to continue running, the load state of the reversed loader 5 is judged after 10 seconds, if the reversed loader is not underloaded, the reversed loader continues running for 10 seconds, and if the reversed loader is underloaded, the states of the coal mining machine 1 and the hydraulic support 3 are judged; if the coal mining machine 1 is cutting coal, the front scraper conveyor is requested to be accelerated, otherwise the elevating conveyor 5 is decelerated by 5 percent to operate; if the hydraulic support 3 is discharging coal, the rear scraper conveyor 4 is requested to increase the speed, otherwise the elevating conveyor 5 is reduced by 5 percent to operate;
if the running current of the reversed loader 5 is more than or equal to 50% of the rated current and less than 150% of the rated current, the reversed loader is in a normal load working state and keeps running in the normal load working state, and the reversed loader 5 stops running until the periodical maintenance is needed;
if the running current of the reversed loader 5 is more than or equal to 150% of the rated current and less than 200% of the rated current, the current state is kept to continue running, the load state of the reversed loader 5 is judged after 10 seconds, if the reversed loader is not overloaded, the reversed loader is continuously run for 10 seconds, and if the reversed loader is overloaded, the states of the coal mining machine 1 and the hydraulic support 3 are judged; if the coal mining machine 1 is cutting coal, the front scraper conveyor 2 is requested to decelerate, otherwise the elevating conveyor 5 operates at the speed reduction of 5%; if the hydraulic support 3 is discharging coal, the rear scraper conveyor 4 is requested to decelerate, otherwise the elevating conveyor 5 operates at the speed reduction of 5%;
if the running current of the reversed loader 5 is more than or equal to 200% of the rated current, the current state is kept running, the loaded state of the reversed loader 5 is judged after 5 seconds, if the reversed loader is not overloaded, the operation is continued for 5 seconds, and if the reversed loader is overloaded, the operation of the front scraper conveyor 2, the rear scraper conveyor 4 and the reversed loader 5 is stopped.
Referring to fig. 2, after the front scraper conveyor 2 is started:
when the elevating conveyor 5 requests to decelerate, if the running speed of the front scraper conveyor 2 is the minimum speed, the coal mining machine 1 is requested to decelerate, otherwise, the front scraper conveyor 2 decelerates by 5 percent to run;
when the elevating conveyor 5 requests acceleration, if the running speed of the front scraper conveyor 2 is the maximum speed, the coal mining machine 1 is requested to accelerate, otherwise, the front scraper conveyor 2 is accelerated by 5% to run;
if the transfer conveyor 5 is not requested, the front scraper conveyor 2 operates as follows according to the operating current thereof:
(1) if the running current of the front scraper conveyor 2 is less than 50% of the rated current, the current state of the front scraper conveyor is kept to continue running, the load state of the front scraper conveyor is judged after 10 seconds, if the current is not underloaded, the front scraper conveyor continues running for 10 seconds, if the current is underloaded, the state of the coal mining machine 1 is judged, if the coal mining machine 1 is cutting coal, the speed of the coal mining machine 1 is requested, otherwise, the front scraper conveyor 2 is decelerated by 5% to run;
(2) if the running current of the front scraper conveyor 2 is more than or equal to 50% of the rated current and less than 150% of the rated current, the front scraper conveyor is in a normal load working state and keeps running in the normal load working state until the front scraper conveyor 2 stops running when regular maintenance is needed;
(3) if the running current of the front scraper conveyor 2 is more than or equal to 150% of the rated current and less than 200% of the rated current, the current state is kept to continue running, the load state is judged after 10 seconds, if the current state is not overloaded, the current state is continued to run for 10 seconds, if the current state is overloaded, the current state is judged, if the current state is not overloaded;
(4) if the running current of the front scraper conveyor 2 is more than or equal to 200% of the rated current, the current state is kept running, the load state is judged after 5 seconds, if not, the front scraper conveyor 2 continues running for 5 seconds, and if the front scraper conveyor is overloaded, the front scraper conveyor 2 stops running.
Referring to fig. 3, after the rear scraper conveyor 4 is started:
when the reversed loader 5 requests to decelerate, if the running speed of the rear scraper conveyor 4 is the minimum speed, the hydraulic support 3 is requested to discharge coal and decelerate, otherwise, the rear scraper conveyor 4 operates at the speed reduced by 5%;
when the elevating conveyor 5 requests acceleration, if the running speed of the rear scraper conveyor 4 is the maximum speed, the hydraulic support 3 is requested to discharge coal and accelerate, otherwise, the rear scraper conveyor 4 is accelerated by 5 percent;
when the reversed loader 5 has no request, the rear scraper conveyor 4 acts according to its running current as follows:
(1) if the running current of the rear scraper conveyor 4 is less than 50% of the rated current, the current state of the rear scraper conveyor is kept to continue running, the load state of the rear scraper conveyor is judged after 10 seconds, if the rear scraper conveyor is not underloaded, the rear scraper conveyor continues running for 10 seconds, if the rear scraper conveyor is underloaded, the state of the hydraulic support 3 is judged, if the hydraulic support 3 is discharging coal, the coal discharging and the speed increasing are requested, and if the rear scraper conveyor 4 is decelerated by 5%, the rear scraper conveyor continues running;
(2) if the running current of the rear scraper conveyor 4 is more than or equal to 50% of the rated current and less than 150% of the rated current, the rear scraper conveyor is in a normal load working state and keeps running in the normal load working state until the rear scraper conveyor 4 stops running when regular maintenance is needed;
(3) if the running current of the rear scraper conveyor 4 is more than or equal to 150% of the rated current and less than 200% of the rated current, the current state is kept to continue running, the load state is judged after 10 seconds, if the current is not overloaded, the current state is continued for 10 seconds, if the current is overloaded, the current state is judged, if the current state is not overloaded, the current state is continued to run, the current state is judged, if the current state is overloaded, the current state is judged, if;
(4) if the running current of the rear scraper conveyor 4 is more than or equal to 200% of the rated current, the current state is kept running, the load state is judged after 5 seconds, if not, the rear scraper conveyor 4 continues running for 5 seconds, and if the rear scraper conveyor 4 is overloaded, the rear scraper conveyor 4 stops running.
The invention also provides an intelligent speed regulating system for coal stream transportation of the underground fully mechanized caving face of the coal mine, which comprises a reversed loader 5 coal stream intelligent speed regulating unit, a front scraper conveyor 2 coal stream intelligent speed regulating unit and a rear scraper conveyor 4 coal stream intelligent speed regulating unit;
the intelligent coal flow speed regulating unit of the reversed loader 5 is used for controlling the running speed of the reversed loader 5;
the coal flow intelligent speed regulating unit of the front scraper conveyor 2 is used for controlling the running speed of the front scraper conveyor 2;
the coal flow intelligent speed regulating unit of the rear scraper conveyor 4 is used for controlling the running speed of the rear scraper conveyor 4.
The intelligent coal flow speed regulating unit of the rear scraper conveyor 4 comprises a coal discharge speed regulating sub-unit of the hydraulic support 3 and is used for controlling the running speed of the hydraulic support 3.
The intelligent coal flow speed regulating unit of the reversed loader 5 obtains the running state of the reversed loader 5 according to the proportional relation between the running current of the reversed loader 5 and the rated current, and sends request signals to the intelligent coal flow speed regulating unit of the front scraper conveyor 2 and the intelligent coal flow speed regulating unit of the rear scraper conveyor 4 by combining the working state of the coal mining machine 1;
the coal flow intelligent speed regulating unit of the front scraper conveyor 2 and the coal flow intelligent speed regulating unit of the rear scraper conveyor 4 collect and judge the running current values thereof, and carry out corresponding speed increasing and reducing according to the request signal of the reversed loader 5.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is intended to include such modifications and variations.
Claims (8)
1. An intelligent speed regulation method for coal stream transportation of a fully mechanized caving face of an underground coal mine is used for controlling the operating frequency of a front scraper conveyor, a rear scraper conveyor and a reversed loader of fully mechanized caving face transportation equipment of a coal mining machine, and is characterized in that:
after the elevating conveyor is started, acquiring and judging the running current value of the elevating conveyor, obtaining the running state of the elevating conveyor according to the proportional relation between the running current of the elevating conveyor and the rated current, and sending request signals to the front scraper conveyor and the rear scraper conveyor by combining the working state of the coal mining machine;
after the front scraper conveyor is started, collecting and judging the running current value of the front scraper conveyor, and carrying out corresponding speed increasing and reducing according to the request signal of the reversed loader;
and after the rear scraper conveyor is started, acquiring and judging the running current value of the rear scraper conveyor, and performing corresponding speed increase and reduction according to the request signal of the reversed loader.
2. The intelligent speed regulating method for coal stream transportation of the underground fully mechanized caving face of a coal mine according to claim 1, wherein a hydraulic support is further arranged on the rear scraper conveyor, and the hydraulic support regulates the coal caving speed according to the request of a reversed loader;
when the hydraulic support is requested to release coal and decelerate, if the number of the coal releasing ports is more than 1, reducing 1 coal releasing port for releasing coal for 5 seconds, otherwise, reducing 50 percent of the size of the coal releasing ports for releasing coal for 5 seconds for 1 coal releasing port;
when the hydraulic support is requested to discharge coal and increase the speed, if the number of the coal discharge ports is less than 3, 1 coal discharge port is added to discharge coal for 5 seconds, and if not, the coal discharge ports are 3 to discharge coal and the current state is kept to perform normal coal discharge.
3. The intelligent speed regulation method for coal stream transportation of the underground fully mechanized caving face of a coal mine according to claim 2, characterized in that after the reversed loader is started:
if the running current of the reversed loader is less than 50% of the rated current, the reversed loader keeps the current state to continue running, the load state of the reversed loader is judged after 10 seconds, if the reversed loader does not carry out underload, the reversed loader continues running for 10 seconds, and if the reversed loader carries out underload, the states of the coal mining machine and the hydraulic support are judged; if the coal cutter is cutting coal, the front scraper conveyor is requested to be accelerated, otherwise the elevating conveyor is decelerated by 5 percent to operate; if the hydraulic support is discharging coal, the rear scraper conveyor is requested to be accelerated, otherwise the elevating conveyor is decelerated by 5 percent to operate;
if the running current of the reversed loader is more than or equal to 50% of the rated current and less than 150% of the rated current, the reversed loader is in a normal load working state and keeps running in the normal load working state until the reversed loader is stopped running when regular maintenance is needed;
if the running current of the reversed loader is more than or equal to 150% of the rated current and less than 200% of the rated current, the current state is kept to continue running, the loading state of the reversed loader is judged after 10 seconds, if the reversed loader is not overloaded, the reversed loader continues running for 10 seconds, and if the reversed loader is overloaded, the states of the coal mining machine and the hydraulic support are judged; if the coal mining machine is cutting coal, the front scraper conveyor is requested to decelerate, otherwise the elevating conveyor operates at the speed reduction of 5%; if the hydraulic support is discharging coal, requesting the rear scraper conveyor to decelerate, otherwise, operating the reversed loader at the speed reduced by 5%;
if the running current of the reversed loader is more than or equal to 200% of the rated current, the reversed loader is kept running in the current state, the loaded state of the reversed loader is judged after 5 seconds, if the reversed loader is not overloaded, the reversed loader is continuously run for 5 seconds, and if the reversed loader is overloaded, the front scraper conveyor, the rear scraper conveyor and the reversed loader are stopped running.
4. The intelligent speed regulation method for coal stream transportation of the underground fully mechanized caving face of a coal mine according to claim 2, characterized in that after the front scraper conveyor is started:
when the reversed loader requests to decelerate, if the running speed of the front scraper conveyor is the minimum speed, the coal mining machine is requested to decelerate, otherwise, the front scraper conveyor decelerates by 5 percent to run;
when the elevating conveyor requests acceleration, if the running speed of the front scraper conveyor is the maximum speed, the coal mining machine is requested to accelerate, otherwise, the front scraper conveyor is accelerated by 5 percent to run;
if the reversed loader has no request, the front scraper conveyor performs the following actions according to the running current of the front scraper conveyor:
(1) if the running current of the front scraper conveyor is less than 50% of the rated current, the front scraper conveyor keeps running continuously in the current state, the load state of the front scraper conveyor is judged after 10 seconds, if the front scraper conveyor is not underloaded, the front scraper conveyor continues running for 10 seconds, if the front scraper conveyor is underloaded, the coal mining machine is judged to be in the state, if the coal mining machine is cutting coal, the speed of the coal mining machine is required to be increased, otherwise, the front scraper conveyor is decelerated;
(2) if the running current of the front scraper conveyor is more than or equal to 50% of the rated current and less than 150% of the rated current, the front scraper conveyor is in a normal load working state and keeps running in the normal load working state until the front scraper conveyor is stopped running when regular maintenance is needed;
(3) if the running current of the front scraper conveyor is more than or equal to 150% of the rated current and less than 200% of the rated current, the front scraper conveyor keeps running continuously in the current state, the load state of the front scraper conveyor is judged after 10 seconds, if the front scraper conveyor is not overloaded, the front scraper conveyor continues running for 10 seconds, if the front scraper conveyor is overloaded, the coal mining machine is judged, if the coal mining machine is cutting coal, the speed of the coal mining machine is required to be reduced, and if the front scraper conveyor is increased by;
(4) if the running current of the front scraper conveyor is more than or equal to 200% of the rated current, the front scraper conveyor keeps running in the current state, the load state of the front scraper conveyor is judged after 5 seconds, if the front scraper conveyor is not overloaded, the front scraper conveyor continues running for 5 seconds, and if the front scraper conveyor is overloaded, the front scraper conveyor stops running.
5. The intelligent speed regulation method for coal stream transportation of the underground fully mechanized caving face of a coal mine according to claim 1, characterized in that after the rear scraper conveyor is started:
when the reversed loader requests to decelerate, if the running speed of the rear scraper conveyor is the minimum speed, the hydraulic support is requested to put coal and decelerate, otherwise, the rear scraper conveyor decelerates by 5 percent to run;
when the elevating conveyor requests acceleration, if the running speed of the rear scraper conveyor is the maximum speed, the coal discharge of the hydraulic support is requested to be accelerated, otherwise, the rear scraper conveyor is accelerated by 5 percent to run;
when the reversed loader has no request, the rear scraper conveyor performs the following actions according to the running current of the rear scraper conveyor:
(1) if the operating current of the rear scraper conveyor is less than 50% of the rated current, the current state of the rear scraper conveyor is kept to continue operating, the load state of the rear scraper conveyor is judged after 10 seconds, if the rear scraper conveyor is not underloaded, the rear scraper conveyor continues operating for 10 seconds, if the rear scraper conveyor is underloaded, the hydraulic support state is judged, if the hydraulic support is discharging coal, the coal discharging and accelerating are requested, and if the hydraulic support is discharging coal, the rear scraper conveyor is decelerated by 5% to operate;
(2) if the running current of the rear scraper conveyor is more than or equal to 50% of the rated current and less than 150% of the rated current, the rear scraper conveyor is in a normal load working state and keeps running in the normal load working state until the rear scraper conveyor is stopped running when regular maintenance is needed;
(3) if the running current of the rear scraper conveyor is more than or equal to 150% of the rated current and less than 200% of the rated current, the rear scraper conveyor keeps running in the current state, the current state is kept running continuously, the load state is judged after 10 seconds, if the rear scraper conveyor is not overloaded, the rear scraper conveyor continues running for 10 seconds, if the rear scraper conveyor is overloaded, the rear scraper conveyor judges the state of the hydraulic support, if the hydraulic support is discharging coal, the coal is required to be discharged and decelerated, and if the rear scraper conveyor is accelerated by 5;
(4) if the running current of the rear scraper conveyor is more than or equal to 200% of the rated current, the rear scraper conveyor keeps running in the current state, the current state is judged after 5 seconds, if the rear scraper conveyor is not overloaded, the rear scraper conveyor continues running for 5 seconds, and if the rear scraper conveyor is overloaded, the rear scraper conveyor stops running.
6. An intelligent speed regulating system for coal flow transportation of a fully mechanized caving face in an underground coal mine is characterized by comprising a reversed loader coal flow intelligent speed regulating unit, a front scraper conveyor coal flow intelligent speed regulating unit and a rear scraper conveyor coal flow intelligent speed regulating unit;
the intelligent speed regulating unit for the coal flow of the reversed loader is used for controlling the running speed of the reversed loader;
the intelligent coal flow speed regulating unit of the front scraper conveyor is used for controlling the running speed of the front scraper conveyor;
the intelligent coal flow speed regulating unit of the rear scraper conveyor is used for controlling the running speed of the rear scraper conveyor.
7. The intelligent speed regulating system for coal stream transportation of the fully mechanized caving face in a coal mine well according to claim 6, wherein the intelligent speed regulating unit for coal stream of the rear scraper conveyor comprises a hydraulic support coal caving speed regulating subunit for controlling the operating speed of the hydraulic support.
8. The intelligent speed regulating system for coal stream transportation of a fully mechanized caving face in a coal mine well according to claim 7, wherein the intelligent speed regulating unit of the coal stream of the reversed loader obtains the operation state of the reversed loader according to the proportional relation between the current of the reversed loader and the rated current, and sends request signals to the intelligent speed regulating unit of the coal stream of the front scraper conveyor and the intelligent speed regulating unit of the coal stream of the rear scraper conveyor in combination with the operation state of the coal mining machine;
the intelligent coal flow speed regulating unit of the front scraper conveyor and the intelligent coal flow speed regulating unit of the rear scraper conveyor collect and judge the running current values of the front scraper conveyor and the rear scraper conveyor, and perform corresponding speed increasing and reducing according to the request signal of the reversed loader.
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