A device and method for preventing people from falling at the entrance of a coal mine transfer machine

Abstract

The present invention discloses a device and method for preventing people from falling into a coal mine at the entrance of a coal mine transfer machine. The device includes a main controller, a distance sensor, a temperature sensor, an alarm device, and monitored equipment. The main controller is connected to the distance sensor, temperature sensor, alarm device, and monitored equipment, respectively. The method includes the following steps: device positioning, pre-sampling, distance measurement determination, temperature measurement determination, alarm and power off. The method utilizes automated monitoring logic steps to implement an unmanned automated monitoring and early warning system for the area where the monitored equipment is located. This effectively prevents people from falling into the area, reduces safety risks in the area, significantly reduces the accident rate in the relevant area, and thereby improves production efficiency.

Description

Technical Field

[0001] The present invention relates to the field of mine safety auxiliary equipment, in particular to a device and method for preventing people from falling at an entrance of a coal mine loader. Background Art

[0002] Coal is a vital energy source for the normal operation of global industry, and the coal industry is also a key economic pillar in parts of my country. Coal mine-related production operations are characterized by complex geological conditions, high risks, and severe environmental pollution. To this day, many production processes, equipment, and processes in the coal industry still require significant improvement.

[0003] Currently, risk control in underground coal mines is far from ideal. Due to the complex production equipment and numerous processes, risk source identification and control systems still have many weaknesses and even blind spots. For example, accidents are prone to occur at the chute transfer machine in the fully mechanized mining face. How to effectively monitor this location to prevent people from falling into it and reduce safety risks is a pressing technical challenge in this field. Summary of the Invention

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a device and method for preventing people from falling at the entrance of a coal mine transfer machine, which can realize automatic monitoring of people falling at the entrance of an underground transfer machine, has a simple structure, is easy to operate and has high reliability.

[0005] In order to achieve the above technical objectives, the present invention adopts the following technical solutions:

[0006] A device for preventing people from falling at the entrance of a coal mine loader comprises a main controller, a distance sensor, a temperature sensor, an alarm device and a monitored device. The main controller is connected to the distance sensor, the temperature sensor, the alarm device and the monitored device respectively.

[0007] Preferably, the temperature sensor is an infrared temperature sensor, and the distance sensor is an infrared distance sensor.

[0008] Preferably, the main controller is a single chip microcomputer.

[0009] A method for preventing people from falling at the entrance of a coal mine loader, using the above-mentioned device for operation, includes the following steps:

[0010] The device is in place, and the distance sensor and temperature sensor are placed at the entrance of the chute. The distance sensor and temperature sensor are placed above the transport device of the monitored equipment and monitor downward. There are more than one distance sensor and temperature sensor. In the transport direction of the transfer machine in the chute, the time when the material passes the temperature sensor is no earlier than the time when it passes the distance sensor;

[0011] The device pre-samples in the working environment to determine the temperature characteristic intervals of people and coal in a certain working environment;

[0012] The distance measuring sensor measures the distance to the target area according to the preset mode. Based on the distance measurement of the objects at the coal transport location of the loader transport device in the monitoring chute, it is determined whether one or more heights of the objects there exceed the monitoring height. If not, temperature signal collection is not performed. If one or more heights exceed the monitoring height h0, the temperature signal of the temperature sensor is transmitted to the main controller. The main controller determines whether there is anyone in the target area based on the preset human and coal temperature characteristic range. If the target temperatures monitored by all temperature sensors are not within the human temperature characteristic range, it is determined that there is no one in the target area. If the target temperatures monitored by one or more temperature sensors are within the human temperature characteristic range, it is determined that someone has fallen into the target area.

[0013] If it is determined that there is no one in the target area, the monitored equipment will work normally. If it is determined that someone has fallen into the target area, the power supply circuit of the monitored equipment will be disconnected, the monitored equipment will be shut down, and the alarm device will be activated;

[0014] After the safety issue is resolved, the control circuit is restored, the monitored equipment operates normally, and the ranging sensor begins regular monitoring.

[0015] Preferably, the lower limit temperature value of the human temperature characteristic interval determined by collecting data in the same coal mine underground environment is 2 to 3° C. higher than the upper limit temperature value of the coal temperature characteristic interval.

[0016] Furthermore, the human temperature characteristic range measured by the above system is 19-33°C, and the coal temperature characteristic range is 14-17°C.

[0017] Preferably, the temperature detection and determination process includes the following steps:

[0018] When it is detected for the first time that a temperature signal value falls into the human temperature characteristic range, the main controller controls the temperature sensor to collect temperature signal values ​​10 times continuously within one second;

[0019] Among the 10 collected temperature signal values, if the number of times they fall into the human temperature characteristic interval reaches the set judgment number standard, it is determined to be human body temperature.

[0020] Preferably, if among the 10 collected temperature signal values, no less than 8 times fall into the human temperature characteristic interval, it is determined to be human body temperature.

[0021] Preferably, the signal monitoring directions of the ranging sensor and the temperature sensor are both vertical, the distance between the ranging sensor and the side wall of the chute and between adjacent ranging sensors is less than 15 cm, the distance between the temperature sensor and the side wall of the chute and between adjacent temperature sensors is less than 15 cm, the distance between the ranging sensor and the bottom of the chute is h, the actual height of the object in the target area is the difference between h and the measured distance, the actual height obtained at each location is compared with the monitoring height h0, and the monitoring height h0 of the ranging sensor in the target area is 15 cm.

[0022] Preferably, the monitored equipment is a transfer machine.

[0023] After adopting the above technical solution, the main controller, infrared ranging sensor, infrared temperature sensor and alarm device are installed in the chute to carry out comprehensive monitoring and management of the monitored equipment, and a series of automated monitoring logic steps are adopted to realize unmanned automated monitoring and early warning system for the area where the monitored equipment is located, which can effectively prevent people from falling, reduce the safety risks in the area, significantly reduce the accident rate in the relevant area, and thereby improve production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the structural principle of a device for preventing people from falling at the entrance of a coal mine loader in the present invention;

[0025] Figure 2 This is a schematic diagram of the principle of a method for preventing people from falling at the entrance of a coal mine loader in the present invention;

[0026] Figure 3 It is a schematic diagram of temperature and distance monitoring in the present invention;

[0027] Figure 4 This is a schematic diagram of the working principle of the distance measuring sensor in the present invention;

[0028] The reference numerals in the figures are as follows:

[0029] 1—Main controller; 2—Distance sensor; 201—First distance sensor; 202—Second distance sensor; 203—Third distance sensor; 3—Temperature sensor; 4—Alarm device; 5—Monitored equipment; 501—Conveyor scraper; 502—Conveyor chain; 6—Chute; 7—Object surface profile; 8—Power supply; 9—Transport direction of transfer machine. DETAILED DESCRIPTION

[0030] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. The following description is only used to explain the present invention and is not used to limit the present invention.

[0031] like Figure 1As shown, the present invention provides a device and method for preventing people from falling at the entrance of a coal mine loader. The device includes a main controller 1, a distance sensor 2, a temperature sensor 3, an alarm device 4, and a monitored device 5. The main controller 1 is connected to the distance sensor 2, the temperature sensor 3, the alarm device 4, and the monitored device 5 respectively.

[0032] Preferably, the temperature sensor 3 is an infrared temperature sensor, and the distance sensor 2 is an infrared distance sensor.

[0033] Preferably, the main controller 1 can adopt various solutions in the well-known technology in this field, and preferably, a single chip microcomputer can be adopted.

[0034] Reference Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 A method for preventing people from falling at the entrance of a coal mine loader, using the above-mentioned device for operation, includes the following steps:

[0035] The device is in place, and the distance sensor 2 and the temperature sensor 3 are placed at the entrance of the chute 6 (the chute 6 is very long in actual working conditions, and only a section at the entrance of the chute 6 is shown in this figure). The distance sensor 2 and the temperature sensor 3 are placed above the transport device of the monitored equipment 5 and monitor downward. The number of the distance sensor 2 and the temperature sensor 3 is more than one. In the transport direction of the transfer machine in the chute 6, the time when the material passes through the temperature sensor 3 is no earlier than the time when it passes through the distance sensor 2; that is, in the transport direction of the transfer machine in the chute 6, the material may pass through the monitoring area of ​​the temperature sensor 3 and the distance sensor 2 (under the sensor) at the same time, or pass under the distance sensor 2 first, and then pass under the temperature sensor 3.

[0036] The device pre-samples in the working environment to determine the characteristic temperature range of people and the characteristic temperature range of coal in a certain working environment. This step is based on the fact that the coal seam temperature and the temperature of people may be different in different coal mines and different working sections. Therefore, it is necessary to pre-collect data for a coal mine that needs to be monitored and a specific monitoring environment. Through the pre-sampled data, the numerical range of the coal seam temperature and the numerical range of the human temperature are obtained, which serve as the numerical standard for the next judgment.

[0037] The distance measuring sensor 2 measures the distance to the target area according to a preset mode. Based on the distance measurement of the objects at the coal transport location of the transfer machine transport device in the monitoring chute 6, it is determined whether there is one or more heights of the objects at the location exceeding the monitoring height h0. If not, temperature signal collection is not performed. If there is one or more heights exceeding the monitoring height h0, the temperature signal of the temperature sensor 3 is transmitted to the main controller 1. The main controller 1 determines whether there is anyone in the target area based on the preset human and coal temperature characteristic intervals. If the target temperatures monitored by all temperature sensors 3 are not within the human temperature characteristic interval, it is determined that there is no one in the target area. If the target temperatures monitored by one or more temperature sensors 3 are within the human temperature characteristic interval, it is determined that someone has fallen into the target area.

[0038] If it is determined that there is no one in the target area, the monitored device 5 operates normally. If it is determined that someone has fallen into the target area, the power supply circuit of the monitored device 5 is disconnected, the monitored device 5 is shut down, and the alarm device 4 is activated.

[0039] After the safety issue is resolved, the power supply circuit of the monitored device 5 is restored, the monitored device 5 operates normally, and the distance measuring sensor 2 starts normal monitoring.

[0040] Preferably, the lower limit temperature value of the human temperature characteristic interval determined by collecting data in the same coal mine underground environment is 2 to 3° C. higher than the upper limit temperature value of the coal temperature characteristic interval.

[0041] Furthermore, the human temperature characteristic range measured by the above system is 19-33°C, and the coal temperature characteristic range is 14-17°C.

[0042] Preferably, the temperature detection and determination process includes the following steps:

[0043] When it is detected for the first time that a temperature signal value falls into the human temperature characteristic interval, the main controller 1 controls the temperature sensor 3 to continuously collect temperature signal values ​​10 times within one second;

[0044] Among the 10 collected temperature signal values, if the number of times they fall into the human temperature characteristic interval reaches the set judgment number standard, it is determined to be human body temperature.

[0045] Preferably, if among the 10 collected temperature signal values, no less than 8 times fall into the human temperature characteristic interval, it is determined to be human body temperature.

[0046] Preferably, the signal monitoring directions of the distance sensor 2 and the temperature sensor 3 are both vertical, the distance between the distance sensor 2 and the side wall of the chute 6 and between adjacent distance sensors 2 is less than 15 cm, and the distance between the temperature sensor 3 and the side wall of the chute 6 and between adjacent temperature sensors 3 is less than 15 cm.

[0047] Figure 4The distance sensor 2 includes a first distance sensor 201, a second distance sensor 202, and a third distance sensor 203. The distance between the distance sensor 2 and the bottom of the chute 6 is h, and the actual height of the object in the target area (the actual height of the object in the target area at the three sensors is h) 1、 h 2、 h3) is the distance between h and the measured distance ( Figure 4 The measured distances at the three ranging sensors are d 1、 d 2、 d3), and the actual height of each place is obtained (the actual heights of the object measured by the three ranging sensors are: h1 = h-d1, h2 = h-d2, h3 = h-d3, and the actual height of each place (h 1、 h 2、 h3) is compared with the monitoring height h0 to determine whether to collect temperature signals. Preferably, the monitoring height h0 can be set to 15 cm. It should be explained that the purpose of setting the monitoring height h0 is to determine whether there is a person by ranging. The lowest height state of the human body is the thickness of the human body in a lying state. The set monitoring height h0 should be lower than the thickness of the human body (adult). For example, it can be set to 15 cm here. If the actual height of the object in the target area measured by all ranging sensors is lower than the monitoring height h0 (for example, 15 cm), the possibility of someone entering can be ruled out, so temperature signal collection can be omitted. Therefore, the monitoring height h0 is used as the starting height for temperature signal collection.

[0048] Preferably, the monitored device 5 is a transfer machine. Figure 4 The figure shows the conveyor scraper 501 and conveyor chain 502 of the transfer machine as the monitored equipment 5. The specific structure of the transfer machine and its position in the chute are all well-known in the art and will not be described in detail here. The monitored equipment 5 can also be other similar equipment that poses a risk of personnel falling. In the underground coal mine operating environment, there are many devices, complex working conditions, and many areas with safety risks. Therefore, this system can be applied to other monitored equipment. The main controller 1, distance sensor 2, temperature sensor 3, alarm device 4, and the power supply connection conditions involved in the present invention are all well-known in the art and will not be described in detail here.

[0049] The above only illustrates the present invention with reference to some embodiments and does not constitute any limitation to the present invention. Any modifications, improvements and equivalent substitutions made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for preventing people from falling at the entrance of a coal mine loader, employing a device for preventing people from falling at the entrance of a coal mine loader. The device comprises a main controller, a distance sensor, a temperature sensor, an alarm device, and a monitored device. The main controller is connected to the distance sensor, the temperature sensor, the alarm device, and the monitored device, respectively. The method for preventing people from falling at the entrance of a coal mine loader comprises the following steps: Step 1: The device is in place. The distance sensor and temperature sensor are placed at the entrance of the chute. The distance sensor and temperature sensor are placed above the transport device of the monitored equipment and monitor downward. There are more than one distance sensor and temperature sensor. In the transport direction of the transfer machine in the chute, the time when the material passes the temperature sensor is no earlier than the time when it passes the distance sensor; Step 2: The device pre-samples in the working environment to determine the human temperature characteristic range and coal temperature characteristic range in a certain working environment; Step 3: The distance measuring sensor measures the distance to the target area according to the preset mode. Based on the distance measurement of the objects at the coal transport location of the transfer machine transport device in the monitoring chute, it is determined whether there is one or more heights of the objects at the location exceeding the monitoring height. If not, the temperature signal is not collected. If there is one or more heights exceeding the monitoring height h0, the temperature signal of the temperature sensor is transmitted to the main controller. The main controller determines whether there is anyone in the target area based on the preset human and coal temperature characteristic range. If the target temperatures monitored by all temperature sensors are not within the human temperature characteristic range, it is determined that there is no one in the target area. If the target temperatures monitored by one or more temperature sensors are within the human temperature characteristic range, it is determined that someone has fallen into the target area. Step 4: If it is determined that there is no one in the target area, the monitored device will operate normally. If it is determined that someone has fallen into the target area, the power supply circuit of the monitored device will be disconnected, the monitored device will be turned off, and the alarm device will be activated; Step 5: After the safety issue is resolved, the control circuit is restored, the monitored equipment works normally, and the ranging sensor begins regular monitoring.

2. The method for preventing people from falling at the entrance of a coal mine loader according to claim 1, characterized in that: The temperature sensor is an infrared temperature sensor, and the distance sensor is an infrared distance sensor.

3. The method for preventing people from falling at the entrance of a coal mine loader according to claim 1, characterized in that: The main controller is a single chip microcomputer.

4. The method for preventing people from falling at the entrance of a coal mine loader according to claim 1, characterized in that: The lower limit temperature value of the human temperature characteristic range determined by collecting data in the same coal mine underground environment is 2 to 3°C higher than the upper limit temperature value of the coal temperature characteristic range.

5. The method for preventing people from falling at the entrance of a coal mine loader according to claim 4, characterized in that: The characteristic temperature range of human body measured by the above device is 19-33°C, and the characteristic temperature range of coal is 14-17°C.

6. The method for preventing people from falling at the entrance of a coal mine loader according to claim 1, characterized in that: The temperature detection and determination process in step 3 includes the following steps: When it is detected for the first time that a temperature signal value falls into the human temperature characteristic range, the main controller controls the temperature sensor to collect temperature signal values ​​10 times continuously within one second; Among the 10 collected temperature signal values, if the number of times they fall into the human temperature characteristic interval reaches the set judgment number standard, it is determined to be human body temperature.

7. The method for preventing people from falling at the entrance of a coal mine loader according to claim 6, characterized in that: If the temperature signal values ​​collected fall into the human temperature characteristic range at least 8 times among the 10 times, it is determined to be human body temperature.

8. The method for preventing people from falling at the entrance of a coal mine loader according to claim 1, characterized in that: The signal monitoring directions of the distance sensor and the temperature sensor are both vertical. The distance between the distance sensor and the side wall of the chute and between adjacent distance sensors is less than 15 cm. The distance between the temperature sensor and the side wall of the chute and between adjacent temperature sensors is less than 15 cm. The distance between the distance sensor and the bottom of the chute is h. The actual height of the object in the target area is the difference between h and the measured distance. The actual height obtained at each location is compared with the monitoring height h0. The monitoring height h0 of the distance sensor in the target area is 15 cm.

9. The method for preventing people from falling at the entrance of a coal mine loader according to claim 1, characterized in that: The monitored device is a transfer machine.

Images