Roadway roof safety warning method

Abstract

The present application relates to a kind of roadway roof safety warning method, belong to mine safety detection technical field.The present application adopts stress luminescence mixed powder and polydimethylsiloxane glue are mixed evenly, obtain stress luminescence film material;Stress luminescence film material is set in the junction of mine roadway roof;When mine roadway roof is balanced, stress luminescence film material does not emit light;When mine roadway roof is unbalanced, stress luminescence film material is stressed and emits light, and the balance degree of roof can be judged by observing different color light-emitting, warning roadway roof has the risk of caving.The present application utilizes the piezoelectric property of stress luminescence film material combined with mine roadway roof, does not need additional excitation source stimulation, different color light-emitting can be generated under the action of different force, play the role of warning the balance state of roof, timely maintenance roof, avoid casualties.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of roadway roof safety warning method, belong to mine safety detection technical field. BACKGROUND

[0002] Safety warning is set for safety considerations to reduce security risks, which can be seen at the factory gate, inside the factory and on the road. Safety warning can alert workers to dangerous conditions in the workplace or surrounding environment, and guide people to take reasonable behavior signs. Safety signs can remind workers to prevent danger and avoid accidents; when danger occurs, people can be instructed to escape as soon as possible, or instructed to take correct, effective and effective measures to contain the damage.

[0003] In the process of underground mining, due to the effect of mine pressure, the roof will collapse. If there are loopholes in the roof management, roof accidents will occur. In coal mine accidents, the number of roof accidents is the largest. According to relevant statistics, the number of casualties in coal mine roof accidents accounts for 40-50% of the total number of casualties in all types of accidents. The reasons are many, including the influence of mine pressure during mining, improper roof management, poor support quality, illegal operation, and backward monitoring and prevention methods. Improving the judgment ability of roof accident precursors is an extremely important link in improving the safety of coal mine underground production.

[0004] At present, the monitoring and early warning device and method of the stability of the roadway roof, the monitoring and early warning device of the stability of the roadway roof, the support and monitoring functions are combined, the support mechanism is set through the base, the lifting rod assembly, the U-shaped groove, the limiting plate, the guide column, the push plate, the pressure plate and the spring, etc. The cooperation of the components itself constitutes a stable mechanism for supporting the roadway roof, and the cooperation of the pressure sensor and the laser ranging module, the extrusion force and the deformation between the monitoring device and the roadway roof are monitored in real time. This not only increases the functionality of the support mechanism, but also further ensures the stability and safety of the roadway through monitoring and early warning; before the roadway is supported, the real-time pressure value and settlement value of the stability of the roadway roof are monitored, and when the collected data exceeds the threshold value, the real-time monitoring unit will control the alarm unit to alarm through the central processing unit; by dividing the risk and using three-color alarm lamp group for corresponding risk flicker warning, the underground workers can timely understand the stability of the roadway environment, so as to ensure timely evacuation when abnormal conditions occur, and further ensure the safety of the roadway personnel. However, the structure of the monitoring and early warning device is complex, and the monitoring method is analyzed by collecting data, which cannot be monitored and warned when the wireless network signal is affected. SUMMARY

[0005] The present application aims at the problems of complex structure and difficult timely warning of the existing roadway roof stability monitoring and early warning device, and provides a roadway roof safety warning method, i.e. utilizing the piezoelectric property of the stress luminescent film material combined with the roadway roof of the ore body, without additional excitation source stimulation, different color luminescence can be generated under the action of different size forces, the warning effect is achieved, the roof is timely repaired, and casualties are avoided.

[0006] A roadway roof safety warning method, and the specific steps are as follows:

[0007] (1) stress luminescent mixed powder is uniformly mixed with polydimethylsiloxane glue PDMS to obtain stress luminescent film material;

[0008] (2) the stress luminescent film material is arranged at the connection of the roadway roof of the ore body; when the roadway roof is balanced, the stress luminescent film material does not luminesce; when the roadway roof of the ore body is unbalanced, the stress luminescent film material luminesces under stress, the roadway roof is warned to have the risk of falling, and the falling risk grade of the roadway roof is evaluated; specifically, the balance degree of the roof is judged according to the different colors of stress luminescence; when the roof is slightly loose, the film at the connection presents blue luminescence; with the increase of the loose degree of the roof, the blue luminescence at the connection is weakened, and weak blue light is emitted; when the loose degree is great, orange luminescence appears, and the roadway roof is warned to have the risk of falling.

[0009] The stress luminescent mixed powder is a composite powder mixed in equal quality of ZnS:xMn and ZnS:yCu; 0 < x < 1, 0 < y < 1.

[0010] The preparation method of the stress luminescent mixed powder, and the specific steps are as follows:

[0011] (1) high-purity ZnS and MnCO3 are ground and uniformly mixed to obtain mixed powder A, and ZnS and CuO are ground and uniformly mixed to obtain mixed powder B;

[0012] (2) the mixed powder A and the mixed powder B are respectively placed in a furnace with a temperature of 900-1250 DEG C and calcined for 6-8h, and then cooled with the furnace and ground and crushed to obtain calcined powder ZnS:xMn and calcined powder ZnS:yCu; the calcined powder ZnS:xMn and the calcined powder ZnS:yCu are mixed in equal quality to obtain stress luminescent mixed powder.

[0013] The mass ratio of the stress luminescent mixed powder to the polydimethylsiloxane glue PDMS is 1:1.5-4.0.

[0014] The polydimethylsiloxane glue PDMS is composed of a commercially available polydimethylsiloxane glue and a commercially available curing agent, and the mass ratio of the commercially available polydimethylsiloxane glue and the commercially available curing agent is 10-12.5:1; the stress luminescent film material prepared in the ratio range has good flexibility and tensile property, and can generate stress luminescence under different force pressing conditions.

[0015] The stress luminescent film material generates stress luminescence, and the roadway roof falling risk level evaluation method:

[0016] I 500 / 580 When I>2, blue light is emitted, the risk level is C level, the roadway roof is in a slightly unbalanced state, and the roof loosening phenomenon needs to be paid attention to;

[0017] When 1≤I 500 / 580 ≤2, weak blue light is emitted, the risk level is B level, and the roadway roof is in an unbalanced state and needs to be overhauled;

[0018] I 500 / 580 When I<1, orange light is emitted, the risk level is A level, and personnel need to evacuate.

[0019] The stress luminescence mechanism of ZnS:xMn and ZnS:xCu is as follows: in the wurtzite structure of ZnS, the applied stress causes a piezoelectric potential, so that the energy band of ZnS is tilted; then, the escape of the untrapped electrons in the defect state into the conduction band, the non-radiative recombination of the electrons and holes; the released energy excites the doped ions, and the photonic emission occurs when the excited doped ions return to the ground state;

[0020] That is, the stress luminescent film material of ZnS:Mn:ZnS:Cu=1:1 is placed at the roof joint, when I 500 / 580 >2, blue light can be observed, the risk level is C level, and the roof is in a slightly unbalanced state, and the roof loosening phenomenon needs to be paid attention to; when 1≤I 500 / 580 ≤2, weak blue light can still be observed, the risk level is B level, and the roof is in an unbalanced state and needs to be overhauled; when I 500 / 580 <1, orange light can be observed, the risk level is A level, and personnel need to evacuate.

[0021] The beneficial effects of the present application are:

[0022] (1) The piezoelectric property of the stress luminescent film material combined with the roadway roof of the ore body is utilized, without the need for an additional excitation source to stimulate, different color light can be generated under the action of different forces, the warning effect is achieved, the roof is overhauled in time, and casualties are avoided;

[0023] (2) The stress luminescent mixed powder is prepared by high-temperature solid-phase sintering, has good chemical stability, does not need to be excited, and has high stress luminescence sensitivity;

[0024] (3) The stress luminescence film material prepared by mixing the stress luminescence mixed powder with PDMS can effectively improve the safety problem for safety warning. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 XRD pattern of ZnS:Mn fluorescent powder of Example 1;

[0026] Figure 2 XRD pattern of ZnS:Cu fluorescent powder of Example 1;

[0027] Figure 3 Stress luminescence spectrum of ZnS:Mn of Example 1;

[0028] Figure 4 Stress luminescence spectrum of ZnS:Cu of Example 1;

[0029] Figure 5 Stress luminescence spectrum of stress luminescence film material of Example 1 under different pressures;

[0030] Figure 6 Stress luminescence film material I of Example 1 500 / 580 Curve graph of change with pressure;

[0031] Figure 7 Schematic diagram of stress luminescence film material of Example 1 in equilibrium state combined with a top plate;

[0032] Figure 8 Schematic diagram of stress luminescence film material of Example 2 in unbalanced state combined with a top plate;

[0033] Figure 9 Schematic diagram of stress luminescence film material of Example 3 in unbalanced state combined with a top plate;

[0034] Figure 10 Schematic diagram of stress luminescence film material of Example 4 in unbalanced state combined with a top plate. DETAILED DESCRIPTION

[0035] The application will be described in further detail below with specific embodiments, but the scope of protection of the application is not limited to the content described.

[0036] Example 1: The stress luminescence mixed powder is prepared by the following specific steps:

[0037] (1) High-purity ZnS and MnCO3 are ground and mixed to obtain mixed powder A; the molar ratio of ZnS to MnCO3 is 1:0.1; ZnS and CuO are ground and mixed to obtain mixed powder B; the molar ratio of ZnS to CuO is 1:0.05;

[0038] (2) Mixed powder A and mixed powder B are calcined at 900℃ for 8 hours, cooled in the furnace, and ground to obtain calcined powder ZnS:xMn and calcined powder ZnS:yCu. The calcined powder ZnS:xMn and calcined powder ZnS:yCu are mixed evenly in equal mass ratio to obtain stress luminescent mixed powder.

[0039] The XRD pattern of the ZnS:Mn luminescent powder in this embodiment is shown below. Figure 1 ,from Figure 1 It can be seen that the diffraction peaks of the ZnS:0.1Mn sample are consistent with those in the ZnS standard card PDF NO.36-1450, indicating that the ZnS phase remains pure; the XRD pattern of the ZnS:Cu luminescent powder is shown in [reference needed]. Figure 2 The diffraction peaks of the sample ZnS:0.05Cu are consistent with those of the ZnS standard card PDF NO.36-1450, indicating that the ZnS phase remains pure.

[0040] The stress emission spectrum of ZnS:Mn in this embodiment is shown in [reference needed]. Figure 3 The sample in the image exhibits orange stress luminescence at 580 nm under force stimulation;

[0041] The stress emission spectrum of ZnS:Cu in this embodiment is shown in [reference needed]. Figure 4 The sample in the image exhibits 500 nm blue stress luminescence under force stimulation;

[0042] The stress emission spectra of the stress-luminescent thin film material in this embodiment under different pressures are shown below. Figure 5 The sample in the image shows a transition from blue stress luminescence to orange stress luminescence under different pressures;

[0043] In this embodiment, the stress-emitting thin film material is luminescent material I. 500 / 580 The curve showing the change with pressure is shown below. Figure 6 , when I 500 / 580 When the value is greater than 2, blue light emission can be observed; when the value is less than 1... 500 / 580 When I < 2, weak blue emission can still be observed; when I 500 / 580 When the value is less than 1, an orange glow can be observed.

[0044] A method for safety warning on the roof of a roadway, the specific steps of which are as follows:

[0045] ​(1) The stress luminescence mixed powder (ZnS:0.1Mn luminescent powder and ZnS:0.05Cu luminescent powder with a mass ratio of 1:1) is mixed with polydimethylsiloxane glue to obtain a stress luminescence film material; the mass ratio of the stress luminescence mixed powder and the polydimethylsiloxane glue PDMS is 1:3.0, the polydimethylsiloxane glue PDMS is composed of a commercially available polydimethylsiloxane glue and a commercially available curing agent, and the mass ratio of the commercially available polydimethylsiloxane glue and the commercially available curing agent is 10:1; the PDMS film prepared under the ratio has good flexibility and stretchability, and can produce stress luminescence under different force pressing conditions;

[0046] (2) The stress luminescence film material is arranged at the connection of the ore body roadway roof; in this embodiment, the stress luminescence film material does not emit light under the balanced stress of the roadway roof (see Figure 7 ).

[0047] Embodiment 2: The stress luminescence mixed powder is prepared by the following steps:

[0048] (1) High-purity ZnS and MnCO3 are ground and mixed to obtain mixed powder A; the molar ratio of ZnS to MnCO3 is 1:0.15; ZnS and CuO are ground and mixed to obtain mixed powder B; the molar ratio of ZnS to CuO is 1:0.08;

[0049] (2) The mixed powder A and the mixed powder B are respectively placed in a furnace with a temperature of 1100℃ for calcination for 7h, and then cooled in the furnace and ground to obtain roasted powder ZnS:xMn and roasted powder ZnS:yCu; the roasted powder ZnS:xMn and the roasted powder ZnS:yCu are mixed in an equal mass ratio to obtain a stress luminescence mixed powder;

[0050] The stress luminescence film material of this embodiment shows a blue stress luminescence to orange stress luminescence transition under different pressures;

[0051] The stress luminescence film material of this embodiment emits a luminescent material I 500 / 580 With the change of pressure: when I 500 / 580 >2, blue light can be observed; when 1<I 500 / 580 <2, weak blue light can still be observed; when I 500 / 580 <1, orange light can be observed;

[0052] A roadway roof safety warning method, the specific steps are as follows:

[0053] (1) The stress luminescence mixed powder (ZnS:0.15Mn luminescent powder and ZnS:0.08Cu luminescent powder with a mass ratio of 1:1) is mixed with polydimethylsiloxane glue to obtain a stress luminescence film material; the mass ratio of the stress luminescence mixed powder and the polydimethylsiloxane glue PDMS is 1:4.0, the polydimethylsiloxane glue PDMS is composed of a commercially available polydimethylsiloxane glue and a commercially available curing agent, and the mass ratio of the commercially available polydimethylsiloxane glue and the commercially available curing agent is 11.0:1; the PDMS film prepared under the ratio has good flexibility and stretchability, and can produce stress luminescence under different force pressing conditions;

[0054] (2) The stress luminescence film material is arranged at the connection of the ore body roadway roof; in this embodiment, the stress luminescence film material emits blue light under unbalanced stress of the roadway roof, 500 / 580 =4 (see Figure 8 ), so the risk level is C level, and the roadway roof is in a slightly unbalanced state, and the roof loosening phenomenon needs to be concerned.

[0055] Example 3: The stress luminescence mixed powder is prepared by the following steps:

[0056] (1) High-purity ZnS and MnCO3 are ground and mixed to obtain mixed powder A; the molar ratio of ZnS to MnCO3 is 1:0.20; ZnS and CuO are ground and mixed to obtain mixed powder B; the molar ratio of ZnS to CuO is 1:0.06;

[0057] (2) The mixed powder A and the mixed powder B are respectively placed in a furnace with a temperature of 1250°C for calcination for 6h, and then cooled in the furnace, ground and crushed to obtain roasted powder ZnS:xMn and roasted powder ZnS:yCu; the roasted powder ZnS:xMn and the roasted powder ZnS:yCu are mixed in an equal mass ratio to obtain a stress luminescence mixed powder;

[0058] The stress luminescence film material of this embodiment shows a blue stress luminescence to orange stress luminescence transition under different pressures;

[0059] The stress luminescence film material of this embodiment emits luminescent material I 500 / 580 With the change of pressure: when I 500 / 580 >2, blue light can be observed; when 1<I 500 / 580 <2, weak blue light can still be observed; when I 500 / 580 <1, orange light can be observed;

[0060] A roadway roof safety warning method, the specific steps are as follows:

[0061] (1) The stress luminescence mixed powder (ZnS:0.20Mn luminescent powder and ZnS:0.06Cu luminescent powder with a mass ratio of 1:1) is mixed with polydimethylsiloxane glue to obtain a stress luminescence film material; the mass ratio of the stress luminescence mixed powder and the polydimethylsiloxane glue PDMS is 1:3.5, the polydimethylsiloxane glue PDMS is composed of a commercially available polydimethylsiloxane glue and a commercially available curing agent, and the mass ratio of the commercially available polydimethylsiloxane glue and the commercially available curing agent is 12.0:1; the PDMS film prepared at the ratio has good flexibility and stretchability, and can generate stress luminescence under different force pressing conditions;

[0062] (2) The stress luminescence film material is arranged at the connection of the ore body roadway roof; in this embodiment, the stress luminescence film material emits weak blue light (see Figure 9 ), I 500 / 580 =1.6, so the risk level is B level, and the roadway roof is in an unbalanced state and needs to be overhauled.

[0063] Embodiment 4: The stress luminescence mixed powder is prepared by the following steps:

[0064] (1) High-purity ZnS and MnCO3 are ground and mixed to obtain mixed powder A; the molar ratio of ZnS to MnCO3 is 1:0.25; ZnS and CuO are ground and mixed to obtain mixed powder B; the molar ratio of ZnS to CuO is 1:0.09;

[0065] (2) The mixed powder A and the mixed powder B are respectively placed in a furnace with a temperature of 1000°C and calcined for 8h, and then cooled in the furnace and ground to obtain calcined powder ZnS:xMn and calcined powder ZnS:yCu; the calcined powder ZnS:xMn and the calcined powder ZnS:yCu are mixed in an equal mass ratio to obtain a stress luminescence mixed powder;

[0066] The stress luminescence film material of this embodiment shows a blue stress luminescence to orange stress luminescence transition under different pressures;

[0067] The stress luminescence film material of this embodiment emits luminescent material I 500 / 580 With the change of pressure: when I 500 / 580 >2, blue light can be observed; when 1<I 500 / 580 <2, weak blue light can still be observed; when I 500 / 580 <1, orange light can be observed;

[0068] A roadway roof safety warning method, the specific steps are as follows:

[0069] (1) the stress luminescence mixed powder (ZnS:0.25Mn luminescent powder and ZnS:0.09Cu luminescent powder with a mass ratio of 1:1) is mixed with polydimethylsiloxane glue to obtain a stress luminescence film material; the mass ratio of the stress luminescence mixed powder and the polydimethylsiloxane glue PDMS is 1:3.0, the polydimethylsiloxane glue PDMS is composed of commercially available polydimethylsiloxane glue and commercially available curing agent, and the mass ratio of the commercially available polydimethylsiloxane glue and the commercially available curing agent is 11.0:1; the PDMS film prepared under the ratio has good flexibility and stretchability, and can produce stress luminescence under different force pressing conditions;

[0070] (2) the stress luminescence film material is arranged at the connection of the ore body roadway roof; the roadway roof of the embodiment is unbalanced in stress, and the stress luminescence film material emits orange light (see Figure 10 500 / 580 I = 0.8, so the risk level is A level, and the roadway roof is in an extremely unbalanced state, and personnel need to evacuate.

[0071] The specific embodiments of the present application are described in detail above, but the present application is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the purpose of the present application.​

Claims

1. A method for safety warning on the roof of a roadway, characterized in that, The specific steps are as follows: (1) Mix a stress luminescence hybrid powder and polydimethylsiloxane glue evenly to obtain a stress luminescence thin film material; the stress luminescence hybrid powder is a composite powder obtained by mixing ZnS:xMn and ZnS:yCu with equal mass; 0 < x < 1, 0 < y < 1; the preparation method of the stress luminescence hybrid powder is as follows: (1) Grind and mix high-purity ZnS and MnCO3 to obtain a mixed powder A, and grind and mix ZnS and CuO to obtain a mixed powder B; (2) Place the mixed powder A and the mixed powder B in a furnace at a temperature of 900 - 1250 °C and calcine for 6 - 8 h, cool with the furnace, grind and crush to obtain the calcined powder ZnS:xMn and the calcined powder ZnS:yCu, and mix the calcined powder ZnS:xMn and the calcined powder ZnS:yCu evenly according to an equal mass ratio to obtain a stress luminescence hybrid powder; (2) Set the stress luminescence thin film material at the connection of the roof of the ore body roadway; when the roof of the roadway is balanced, the stress luminescence thin film material does not emit light; when the roof of the ore body roadway is unbalanced, the stress luminescence thin film material is stressed and emits light, warning that there is a risk of roof fall in the roadway, and evaluating the risk level of roof fall in the roadway; When the stress luminescence thin film material is stressed and emits light, the method for evaluating the risk level of roof fall in the roadway specifically includes: I 500 / 580 When the light is >2, it is blue and the risk level is C. The roof of the tunnel is in a slightly unbalanced state and attention should be paid to the possibility of the roof loosening again. 1≤I 500 / 580 When the value is ≤2, the light is weak blue, the risk level is B, the roof of the tunnel is in an unbalanced state and needs to be inspected. I 500 / 580 When the temperature drops below 1, the light will illuminate in orange, indicating a risk level of A, and personnel must evacuate.

2. The roadway roof safety warning method according to claim 1, characterized in that: Step (1) The molar ratio of ZnS to MnCO3 in the mixed powder A is 1:x, 0 < x < 1; the molar ratio of ZnS to CuO in the mixed powder B is 1:y, 0 < y < 0.

1.

3. The roadway roof safety warning method according to claim 1, characterized in that: The mass ratio of the stress luminescence hybrid powder to polydimethylsiloxane glue is 1:1.5 - 4.0.

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