Monitoring System for Starting and Stopping of Fan Equipment in Coal Mine and Redundant Monitoring Method

Abstract

The present invention discloses a monitoring system for the start and stop of a fan device in a coal mine, comprising: a host computer; a sub-station, which is connected to the host computer; and a plurality of start-stop sensors, all of the plurality of start-stop sensors being connected to the sub-station, and the plurality of start-stop sensors being used for monitoring the start and stop states of the fan device in the coal mine. The structure of the present invention is simple. By setting a plurality of start-stop sensors to detect the start and stop states of the fan device in the coal mine and feeding the monitoring results back to the host computer through the sub-station, real-time monitoring can be achieved. At the same time, by setting a plurality of start-stop sensors and monitoring the start-stop sensors themselves through the mutual start-stop logical relationship between the plurality of start-stop sensors, false alarms of the start-stop sensors themselves can be avoided, thereby avoiding shutdowns caused by false alarms and effectively improving production efficiency.

Description

Technical Field

[0001] The present invention belongs to the technical field of monitoring, and particularly relates to a monitoring system for the start and stop of fan equipment in coal mines and a redundant monitoring method. Background Art

[0002] Article 7.9 of the "Code for the Use and Management of Coal Mine Safety Monitoring Systems and Detection Instruments AQ1029-2019" stipulates that start-stop sensors shall be installed on main ventilators and local ventilators. Article 164 of the "Coal Mine Safety Regulations 2016" stipulates: (8) The wind-electricity interlock and methane-electricity interlock tests shall be carried out at least once every 15 days, and the automatic switching test between the normally operating local ventilator and the standby local ventilator shall be carried out every day. During the test period, local ventilation shall not be affected, and the test records shall be filed for future reference. (9) It is strictly prohibited to use 3 or more local ventilators to supply air to 1 driving face at the same time. It is not allowed to use 1 local ventilator to supply air to 2 or more driving faces in operation at the same time.

[0003] The start-stop sensor has no direct electrical connection with the device to be measured and is mainly used to detect the start-stop state of the device. Due to coal mine underground operations, there are cases where the start-stop sensor misjudges due to improper installation and debugging or external interference. Especially during the switching between the main and standby fans, it is easy to cause misjudgment of the start-stop sensor, seriously affecting the coal mine safety production efficiency. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art.

[0005] To this end, the present invention provides a monitoring system for the start and stop of fan equipment in coal mines, which has the advantage of redundantly monitoring the start-stop sensor to avoid false alarms.

[0006] The monitoring system for the start and stop of fan equipment in coal mines according to an embodiment of the present invention includes: a host computer; a sub-station connected to the host computer; and a plurality of start-stop sensors, all of the plurality of start-stop sensors are connected to the sub-station, and the plurality of start-stop sensors are used to monitor the start-stop state of fan equipment in coal mines.

[0007] The beneficial effects of the present invention are as follows: The structure of the present invention is simple. By setting a plurality of start-stop sensors to detect the start-stop state of fan equipment in coal mines and feeding back the monitoring results to the host computer through the sub-station, real-time monitoring can be achieved. At the same time, by setting a plurality of start-stop sensors and monitoring the start-stop sensors themselves through the mutual start-stop logical relationship between the plurality of start-stop sensors, false alarms of the start-stop sensors themselves can be avoided, thereby avoiding shutdowns caused by false alarms and effectively improving production efficiency.

[0008] According to an embodiment of the present invention, the fan equipment includes: a main fan and a standby fan. The main fan has a first primary motor and a first secondary motor, and the standby fan has a second primary motor and a second secondary motor.

[0009] According to an embodiment of the present invention, the start-stop sensor includes: a first start-stop sensor disposed on the cable of the first primary motor; a second start-stop sensor disposed on the cable of the first secondary motor; a third start-stop sensor disposed on the cable of the second primary motor; and a fourth start-stop sensor disposed on the cable of the second secondary motor.

[0010] According to an embodiment of the present invention, the first start-stop sensor, the second start-stop sensor, the third start-stop sensor, and the fourth start-stop sensor are connected to the substation in a wired or wireless manner.

[0011] According to an embodiment of the present invention, the first start-stop sensor, the second start-stop sensor, the third start-stop sensor, and the fourth start-stop sensor are used to monitor the magnetic field value inside the corresponding cable.

[0012] According to an embodiment of the present invention, a redundant monitoring method for a monitoring system of the start-stop of a fan equipment in a coal mine using the above is as follows. The method includes the steps of: multiple start-stop sensors continuously monitor the magnetic field values inside their respective corresponding cables; determine whether the monitoring results of the multiple start-stop sensors are normal according to the change of the magnetic field value. If the monitoring result of a start-stop sensor is abnormal, adjust the monitoring result of the start-stop sensor according to the start-stop logic relationship.

[0013] According to an embodiment of the present invention, the start-stop logic relationship is specifically: when one of the main fan and the standby fan is started, the other is stopped; the first primary motor being in a working state is a necessary condition for the first secondary motor to start working; the second primary motor being in a working state is a necessary condition for the second secondary motor to start working.

[0014] According to an embodiment of the present invention, another necessary condition for the first secondary motor to start working is that the actual ventilation volume when the first primary motor is working is lower than the ventilation requirement; another necessary condition for the second secondary motor to start working is that the actual ventilation volume when the second primary motor is working is lower than the ventilation requirement.

[0015] According to an embodiment of the present invention, a change threshold of the magnetic field value is set. If it is detected that the change in the magnetic field value of the cables in both the main fan and the standby fan is greater than the change threshold, and at the same time, the magnetic field value of the cable of one of the main fan and the standby fan decreases while the other increases, then the main fan and the standby fan are in a switching state at this time. According to the states of the main fan and the standby fan before and after the switching, it is judged whether the monitoring results of multiple start-stop sensors are correct. If the monitoring results of some start-stop sensors do not match the states of the main fan and the standby fan before and after the switching, then the monitoring results of some start-stop sensors are readjusted according to the start-stop logical relationship.

[0016] According to an embodiment of the present invention, if it is detected that the change in the magnetic field value of the cable in the main fan or the standby fan is less than the change threshold, then it is monitored again after a certain time delay. If the start-stop sensor detects that the change in the magnetic field value of the cable is less than the change threshold, it is determined as external environmental interference, and the monitoring result of the start-stop sensor remains unchanged. If the start-stop sensor detects that the change in the magnetic field value of the cable is greater than the change threshold, then the monitoring result of the start-stop sensor is readjusted according to the start-stop logical relationship.

[0017] Other features and advantages of the present invention will be described in the following description of the specification, and, in part, will be obvious from the description of the specification, or will be understood by implementing the present invention. The objectives and other advantages of the present invention are achieved and obtained by the structures specifically pointed out in the description of the specification, the claims, and the drawings.

[0018] In order to make the above-mentioned objectives, features, and advantages of the present invention more obvious and understandable, the following specifically provides preferred embodiments and, in conjunction with the accompanying drawings, the detailed description is as follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and / or additional aspects and advantages of the present invention will become obvious and easy to understand from the following description of the embodiments with reference to the drawings, in which:

[0020] Figure 1 is a schematic structural diagram of a monitoring system for the start and stop of a fan device in a coal mine according to the present invention;

[0021] Figure 2 is a schematic flowchart of a monitoring method for the start and stop of a fan device in a coal mine according to the present invention; DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] The embodiments of the present invention are described in detail below. The examples of the embodiments are shown in the drawings, in which the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions from beginning to end. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation of the present invention.

[0023] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the present invention. In addition, the features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0024] In the description of the present invention, it should be noted that, unless otherwise clearly defined and limited, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0025] The monitoring system and redundant monitoring method for the start / stop of a fan device in a coal mine according to an embodiment of the present invention will be specifically described below with reference to the accompanying drawings.

[0026] As Figure 1 - Figure 2 shown, the monitoring system for the start / stop of a fan device in a coal mine according to an embodiment of the present invention includes: a host computer, a sub-station, and a plurality of start / stop sensors. The sub-station is connected to the host computer; a plurality of start / stop sensors are all connected to the sub-station, and the plurality of start / stop sensors are used to monitor the start / stop state of the fan device in the coal mine.

[0027] The beneficial effect of the present invention is that the structure of the present invention is simple. By setting a plurality of start / stop sensors to detect the start / stop state of the fan device in the coal mine and feeding the monitoring results back to the host computer through the sub-station, real-time monitoring can be achieved. At the same time, by setting a plurality of start / stop sensors and monitoring the start / stop sensors themselves through the mutual start / stop logic relationship between the plurality of start / stop sensors, false alarms of the start / stop sensors themselves can be avoided, thereby avoiding shutdowns caused by false alarms and effectively improving production efficiency.

[0028] According to an embodiment of the present invention, a fan device includes: a main fan and a standby fan. The main fan has a first primary motor and a first secondary motor, and the standby fan has a second primary motor and a second secondary motor. In other words, the fan device includes a main fan and a standby fan. According to the requirements of various management specifications for the fan device in the mine, only one of the main fan and the standby fan can be in the working state. Both the main fan and the standby fan have two motors, and the two motors can be started simultaneously only when the ventilation volume is less than the requirement.

[0029] According to an embodiment of the present invention, the start-stop sensor includes: a first start-stop sensor, a second start-stop sensor, a third start-stop sensor, and a fourth start-stop sensor. The first start-stop sensor is disposed on the cable of the first primary motor; the second start-stop sensor is disposed on the cable of the first secondary motor; the third start-stop sensor is disposed on the cable of the second primary motor; the fourth start-stop sensor is disposed on the cable of the second secondary motor.

[0030] Further, the first start-stop sensor, the second start-stop sensor, the third start-stop sensor, and the fourth start-stop sensor are connected to the substation in a wired or wireless manner.

[0031] Furthermore, the first start-stop sensor, the second start-stop sensor, the third start-stop sensor, and the fourth start-stop sensor are used to monitor the magnetic field value inside the corresponding cable. That is to say, the start-stop sensor mainly determines whether the motor corresponding to the cable is in the working state by monitoring the change of the magnetic field value inside the cable.

[0032] The present invention also discloses a redundant monitoring method for a monitoring system of the start-stop of a fan device in a coal mine using the above, including the following steps: a plurality of start-stop sensors continuously monitor the magnetic field values inside their respective corresponding cables; determine whether the monitoring results of the plurality of start-stop sensors are normal according to the change of the magnetic field value. If the monitoring result of the start-stop sensor is abnormal, adjust the monitoring result of the start-stop sensor according to the start-stop logic relationship.

[0033] That is to say, due to the influence of the harsh environment underground in the mine, the start-stop sensor will give false alarms when monitoring the working states of the main fan and the standby fan. The start-stop logic relationship is used to prove whether the monitoring result of the start-stop sensor is correct. If it is incorrect, the start-stop sensor that gives a false alarm is adjusted to be normal through the start-stop logic relationship.

[0034] According to an embodiment of the present invention, the start-stop logic relationship is specifically as follows: when one of the main fan and the standby fan is turned on, the other is turned off; the first primary motor being in the working state is a necessary condition for the first secondary motor to start working; the second primary motor being in the working state is a necessary condition for the second secondary motor to start working. Further, another necessary condition for the first secondary motor to start working is that the actual ventilation volume during the operation of the first primary motor is lower than the ventilation requirement; another necessary condition for the second secondary motor to start working is that the actual ventilation volume during the operation of the second primary motor is lower than the ventilation requirement.

[0035] Table 1: Start-stop logic relationship

[0036] Fan Category / Logical Relationship First First - stage Motor First Second - stage Motor Second First - stage Motor Second Second - stage Motor First First - stage Motor √ - × × First Second - stage Motor √ √ × × Second First - stage Motor × × √ - Second Second - stage Motor × × √ √

[0037] Note: "√" represents the situation that must occur, "×" represents the situation that cannot occur, and "-" represents the situation that may occur

[0038] In other words, the start-stop logic relationship is as shown in Table 1. Relationship 1: when the first primary motor is definitely turned on, the first secondary motor may be turned on, and the second primary motor and the second secondary motor cannot be turned on; Relationship 2: when the first secondary motor is definitely turned on, the first primary motor must be turned on, and the second primary motor and the second secondary motor cannot be turned on; Relationship 3: when the second primary motor is definitely turned on, the second secondary motor may be turned on, and the first primary motor and the first secondary motor cannot be turned on; Relationship 4: when the second secondary motor is definitely turned on, the second primary motor must be turned on, and the first primary motor and the first secondary motor cannot be turned on.

[0039] According to an embodiment of the present invention, a change threshold of the magnetic field value is set. If it is detected that the change in the magnetic field value of the cables in both the main fan and the standby fan is greater than the change threshold, and at the same time, the magnetic field value of the cable of one of the main fan and the standby fan decreases while the other increases, then the main fan and the standby fan are in the switching state at this time. According to the states of the main fan and the standby fan before and after the switching, it is judged whether the monitoring results of multiple start-stop sensors are correct. If the monitoring results of some start-stop sensors do not match the states of the main fan and the standby fan before and after the switching, then the monitoring results of some start-stop sensors are readjusted according to the start-stop logic relationship. Further, if it is detected that the change in the magnetic field value of the cable in the main fan or the standby fan is less than the change threshold, then it is monitored again after a certain time delay. If the start-stop sensor detects that the change in the magnetic field value of the cable is less than the change threshold, it is determined as external environmental interference, and the monitoring result of the start-stop sensor remains unchanged. If the start-stop sensor detects that the change in the magnetic field value of the cable is greater than the change threshold, then the monitoring result of the start-stop sensor is readjusted according to the start-stop logic relationship.

[0040] That is to say, as Figure 2As shown, the first start-stop sensor, the second start-stop sensor, the third start-stop sensor, and the fourth start-stop sensor detect changes in the magnetic field values in the corresponding cables. If the magnetic field value changes of one of the first start-stop sensor and the second start-stop sensor and one of the third start-stop sensor and the fourth start-stop sensor exceed the threshold simultaneously, and one magnetic field value is decreasing while the other is increasing, then at this time the main fan is shutting down and the standby fan is starting to work, or the main fan is starting to work and the standby fan is shutting down. On the other hand, if the start-stop sensor detects that the change in the magnetic field value of the cable is less than the change threshold, it is determined that the change in the magnetic field value is caused by external environmental interference; combined with the start-stop logic relationship and when the actual ventilation volume is lower than the ventilation requirement, two motors need to be started, and when the actual ventilation volume meets the ventilation requirement, only one motor needs to be started. Then the process of switching between the main fan and the standby fan is as follows: only the first first-stage motor is started, and it changes to only the second first-stage motor being started; the first first-stage motor and the first second-stage motor are started, and it changes to the second first-stage motor and the second second-stage motor being started; only the second first-stage motor is started, and it changes to only the first first-stage motor being started; the second first-stage motor and the second second-stage motor are started, and it changes to the first first-stage motor and the first second-stage motor being started. During the above transformation process, if the monitoring results output by the corresponding start-stop sensor before and after the transformation are inconsistent with the transformation process, it means that the start-stop sensor has given a false alarm and the monitoring results need to be adjusted again. For example, when the first first-stage motor and the first second-stage motor are started and change to the second first-stage motor and the second second-stage motor being started, the monitoring results of the first start-stop sensor and the second start-stop sensor should theoretically change from on to off, and the monitoring results of the third start-stop sensor and the fourth start-stop sensor should theoretically change from off to on. If the actual monitoring results do not match, the monitoring results of the corresponding start-stop sensor are adjusted. Through the above automatic switching test of the main fan and the standby fan, each start-stop sensor is kept in a normal state, avoiding false alarms of the start-stop sensor.

[0041] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0042] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and purposes of the present invention, and the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A redundant monitoring method for the start and stop of a fan device in a coal mine, characterized in that, The redundant monitoring method adopts a monitoring system for the start / stop of fan equipment in a coal mine. The monitoring system includes: A host computer; Substations, which are connected to the host computer; Multiple start / stop sensors, all of which are connected to the substations. The multiple start / stop sensors are used to monitor the start / stop status of fan equipment in the coal mine. The fan equipment includes a main fan and a standby fan. The main fan has a first-stage motor and a second-stage motor, and the standby fan has a second-stage motor and a second-stage motor; The method includes the following steps: Multiple start / stop sensors continuously monitor the magnetic field values inside their respective corresponding cables; Determine whether the monitoring results of the multiple start / stop sensors are normal according to the change of the magnetic field value. If the monitoring result of a start / stop sensor is abnormal, adjust the monitoring result of the start / stop sensor according to the start / stop logic relationship; Among them, the start / stop logic relationship is specifically: when one of the main fan and the standby fan is started, the other is stopped; the first-stage motor being in the working state is a necessary condition for the first-stage motor to start working; the second-stage motor being in the working state is a necessary condition for the second-stage motor to start working.

2. The redundant monitoring method for the start and stop of a fan device in a coal mine according to claim 1, wherein, The start / stop sensor includes: A first start / stop sensor, which is arranged on the cable of the first-stage motor; A second start / stop sensor, which is arranged on the cable of the first-stage motor; A third start / stop sensor, which is arranged on the cable of the second-stage motor; A fourth start / stop sensor, which is arranged on the cable of the second-stage motor.

3. The redundant monitoring method for starting and stopping of a fan device in a coal mine according to claim 2, wherein, The first start / stop sensor, the second start / stop sensor, the third start / stop sensor, and the fourth start / stop sensor are connected to the substation in a wired or wireless manner.

4. The redundant monitoring method for the start and stop of a fan device in a coal mine according to claim 3, wherein, The first start / stop sensor, the second start / stop sensor, the third start / stop sensor, and the fourth start / stop sensor are used to monitor the magnetic field values inside the corresponding cables.

5. The redundant monitoring method for the start and stop of a fan device in a coal mine according to claim 1, wherein Another necessary condition for the first-stage motor to start working is that the actual ventilation volume when the first-stage motor is working is lower than the ventilation requirement; another necessary condition for the second-stage motor to start working is that the actual ventilation volume when the second-stage motor is working is lower than the ventilation requirement.

6. The redundant monitoring method for the start / stop of a fan device in a coal mine according to claim 5, characterized in that, Set a change threshold for the magnetic field value. If it is detected that the change in the magnetic field value of the cables in both the main fan and the standby fan is greater than the change threshold, and at the same time, the magnetic field value of the cable of the main fan and the magnetic field value of the cable of the standby fan decrease and increase respectively, then the main fan and the standby fan are in the switching state at this time. According to the states before and after the switching of the main fan and the standby fan, judge whether the monitoring results of the multiple start / stop sensors are correct. If the monitoring results of some start / stop sensors do not match the states before and after the switching of the main fan and the standby fan, re-adjust the monitoring results of some start / stop sensors according to the start / stop logic relationship.

7. The redundant monitoring method for starting and stopping of a fan device in a coal mine according to claim 6, characterized in that, If the change in the magnetic field value of the cable inside the main fan or the standby fan is detected to be less than the change threshold, it is monitored again after a certain delay. If the start-stop sensor detects that the change in the magnetic field value of the cable is less than the change threshold, it is determined to be external environmental interference, and the monitoring result of the start-stop sensor remains unchanged. If the start-stop sensor detects that the change in the magnetic field value of the cable is greater than the change threshold, the monitoring result of the start-stop sensor is re-adjusted according to the start-stop logic relationship.

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