Working face support quality evaluation method

Abstract

The application discloses a kind of working face quality evaluation method of helping, comprising the following steps: S1: through multiple monitoring points on helping plate, obtain multiple pressure values P1, P2, …, Pn of setting time;S2: multiple pressure values P1, P2, …, Pn are calculated to obtain pressure average P and standard deviation S;S3: determine average pressure threshold PL and standard deviation threshold SL;S4: pressure average P is compared with average pressure threshold PL, and standard deviation S is compared with standard deviation threshold SL;If pressure average P is not less than average pressure threshold PL, and standard deviation S is not greater than standard deviation threshold SL, then judge helping quality to meet requirements;If pressure average P is less than average pressure threshold PL, and standard deviation S is greater than standard deviation threshold SL, then judge helping quality to meet requirements.The helping quality evaluation method of the application can realize the evaluation and classification of helping quality, and also can play a certain helping early warning effect, improve the safety of working face mining.

Description

Technical Field

[0001] This invention relates to the field of mining technology, and more specifically, to a method for evaluating the quality of working face support based on a support plate. Background Technology

[0002] Coal face spalling is a disaster caused by mining pressure manifestation at the working face, threatening the safety of personnel and equipment. Therefore, hydraulic supports for mining faces with a mining height exceeding 3.5m are currently equipped with side protection mechanisms such as side plates. However, in related technologies, the side protection mechanism can only achieve protection by manually adjusting the inclination angle of the side plates based on experience. The overall quality of side protection cannot be guaranteed, and effective early warning of side protection is also impossible, resulting in significant safety hazards in the mining face. Summary of the Invention

[0003] The present invention aims to at least partially solve one of the technical problems in the related art.

[0004] Therefore, this invention proposes a method for evaluating the quality of working face side protection. This method can evaluate and classify the quality of side protection, and can also play a certain role in early warning of side spalling, thereby improving the safety of working face mining.

[0005] The method for evaluating the quality of the working face support plate according to this invention is based on a support plate, wherein the support plate is provided with multiple monitoring points, and the method includes the following steps:

[0006] S1: Obtain multiple pressure values ​​P1, P2, ..., Pn at a set time through multiple monitoring points on the side plate;

[0007] S2: Calculate the average pressure P and standard deviation S using the multiple pressure values ​​P1, P2, ..., Pn;

[0008] S3: Determine the mean pressure threshold PL and the standard deviation threshold SL;

[0009] S4: Compare the average pressure P with the average pressure threshold PL, and compare the standard deviation S with the standard deviation threshold SL;

[0010] If the average pressure P is not less than the average pressure threshold PL and the standard deviation S is not greater than the standard deviation threshold SL, then the quality of the protective lining is determined to meet the requirements.

[0011] If the average pressure P is less than the average pressure threshold PL, and the standard deviation S is greater than the standard deviation threshold SL, then the quality of the protective lining is determined to be unacceptable.

[0012] In some embodiments, the method further includes step S5: if it is determined that the quality of the protective sleeve does not meet the requirements, the cases of non-compliance of the protective sleeve quality are classified, and then corresponding protective sleeve improvements are made for each case.

[0013] In some embodiments, step S5 includes the following steps:

[0014] S51: Classify the cases where the quality of the protective lining does not meet the requirements based on the comparison results of the average pressure P and the average pressure threshold PL, and the comparison results of the standard deviation S and the standard deviation threshold SL.

[0015] S52: If the average pressure P is not less than the average pressure threshold PL, and the standard deviation S is greater than the standard deviation threshold SL, then it is identified as the first case and the support force meets the requirements, the coal wall is uneven, and local coal leakage is easy.

[0016] If the average pressure P is less than the average pressure threshold PL and the standard deviation S is not greater than the standard deviation threshold SL, then it is identified as the second case and the support force is not up to standard, and the coal wall has good flatness and fit.

[0017] If the average pressure P is less than the average pressure threshold PL, and the standard deviation S is greater than the standard deviation threshold SL, then it is identified as the third case and it is determined that the support force does not meet the requirements, the coal wall is uneven, and local coal leakage is likely.

[0018] In some embodiments, when the first situation described above occurs, the side protection is improved by increasing the flatness of the coal wall during the next coal cut and enhancing the timeliness of side protection.

[0019] When the second situation mentioned above occurs, the side protection is improved by increasing the contact pressure between the side protection plate and the coal wall.

[0020] When the third situation mentioned above occurs, the side protection is improved by increasing the flatness of the coal wall in the next coal cut, enhancing the timeliness of the side protection, and increasing the contact pressure of the side protection plate against the coal wall.

[0021] In some embodiments, the side panel includes:

[0022] The plate body has an installation cavity inside;

[0023] A sensing component is disposed within the mounting cavity. The sensing component includes an optical fiber and two fixing plates. The optical fiber is disposed between the two fixing plates and extends in a bent manner. Multiple gratings are provided on the optical fiber. The multiple gratings are arranged at intervals along the extension direction of the optical fiber. Each grating is used to deform when the plate body deforms in order to output monitoring information and form the monitoring point.

[0024] In some embodiments, the plate body includes two mounting plates arranged opposite to each other, and at least one of the two mounting plates has a groove on its sidewall facing each other, the interior space of the groove forming the mounting cavity.

[0025] In some embodiments, one of the mounting plates has a contact surface for contacting the coal wall, the mounting cavity is arranged parallel to and extends along the contact surface, and the thickness of the mounting cavity is not less than the thickness of the sensing component in the normal direction of the contact surface.

[0026] In some embodiments, at least a portion of the mounting cavity is bent and extended, and both of the fixing plates are bendable to make the sensing component bendable.

[0027] And / or, the optical fiber is spirally coiled or bent repeatedly in a plane parallel to the contact surface, and the plurality of gratings are evenly distributed in a plane parallel to the contact surface.

[0028] In some embodiments, the two mounting plates are fitted and sealed together, and the mounting cavity is filled with a filler that fills the space between the sensing component and the cavity wall of the mounting cavity.

[0029] In some embodiments, the two fixing plates are made of different materials, and at least one of the two fixing plates is flexibly deformable.

[0030] Beneficial effects: The working face support quality evaluation method of the present invention can evaluate and classify the quality of the support, and can also play a certain role in early warning of side slope collapse. Furthermore, based on the classification, subsequent support operations can be improved in a targeted manner to enhance the quality of the support, thereby fully ensuring the safety of working face mining. Attached Figure Description

[0031] Figure 1 This is a logic block diagram of the working face protection quality evaluation method according to an embodiment of the present invention.

[0032] Figure 2 This is a schematic diagram of the rear side of the side guard plate according to an embodiment of the present invention.

[0033] Figure 3 yes Figure 2 Schematic diagram of cross-section at point AA.

[0034] Figure 4 yes Figure 2 A schematic diagram of the front side of the middle protective panel.

[0035] Figure 5 yes Figure 4 Schematic diagram of cross-section at point BB.

[0036] Figure 6yes Figure 5 A schematic diagram of the sensing component.

[0037] Figure 7 yes Figure 6 A cross-sectional view at point CC.

[0038] Figure 8 This is a schematic diagram of an installation plate according to an embodiment of the present invention.

[0039] Figure 9 yes Figure 8 Schematic diagram of cross-section at point DD.

[0040] Figure 10 This is a schematic diagram of a sensing component according to another embodiment of the present invention.

[0041] Figure 11 This is a schematic diagram of a sensing component according to another embodiment of the present invention.

[0042] Figure label:

[0043] Plate 1; Opening 11; Mounting plate 12; Contact surface 121; Groove 122; Mounting cavity 13;

[0044] Interface 2;

[0045] Sensing component 3; optical fiber 31; fixing plate 32; perforation 321; first plate 322; second plate 323; grating 33. Detailed Implementation

[0046] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0047] The working face protection quality evaluation method (hereinafter referred to as the protection quality evaluation method) of this invention has multiple monitoring points on the protection plate. The monitoring points are specifically pressure measuring points, which can be implemented by arranging monitoring sensors on the protection plate.

[0048] like Figure 1 As shown, the quality evaluation method for protective equipment includes the following steps:

[0049] S1: Obtain multiple pressure values ​​P1, P2, ..., Pn at a set time through multiple monitoring points on the side guard plate. For example, the side guard plate can be hinged to the front end of the top beam of the hydraulic support through ear plates, etc. In use, the side guard plate can be driven to swing by the side guard cylinder, so that the side guard plate can fit against the coal wall of the working face to be mined.

[0050] During the mining process, multiple monitoring points on the sidewall will be subjected to pressure from the coal face, and these pressures will change with the mining process. The multiple monitoring points on the sidewall can monitor the pressure changes at the corresponding locations, and the pressure value monitored by each monitoring point is called pressure value P1, P2, ..., Pn.

[0051] S2: Calculate the average pressure P and standard deviation S using the multiple pressure values ​​P1, P2, ..., Pn. The average pressure P can be obtained by first summing the multiple pressure values ​​P1, P2, ..., Pn, and then dividing by the sum of the values. The standard deviation S can be obtained by first calculating the variance of the multiple pressure values ​​using the variance formula, and then taking the square root of the variance.

[0052] S3: Determine the average pressure threshold PL and the standard deviation threshold SL. Specifically, both the average pressure threshold PL and the standard deviation threshold SL can be obtained through numerical simulation, field monitoring, etc. For example, under the condition of ensuring good side protection, multiple monitoring points on the side protection plate can be used to monitor the coal wall multiple times within a certain period of time. Then, the average pressure value monitored by each monitoring point in each time is taken, and the median of the multiple average values ​​can be used as the average pressure threshold PL.

[0053] Similarly, under the condition of ensuring good side protection, the coal wall can be monitored multiple times within a certain period of time using multiple monitoring points on the side protection plate. Then, the standard deviation of the pressure value monitored by each monitoring point each time is calculated, and the median of the multiple standard deviations can be used as the standard deviation threshold SL.

[0054] S4: Compare the average pressure P with the average pressure threshold PL, and compare the standard deviation S with the standard deviation threshold SL.

[0055] If the average pressure P is not less than the average pressure threshold PL, and the standard deviation S is not greater than the standard deviation threshold SL, then the quality of the protective lining is determined to meet the requirements. If the average pressure P is less than the average pressure threshold PL, and the standard deviation S is greater than the standard deviation threshold SL, then the quality of the protective lining is determined to not meet the requirements.

[0056] It should be noted that a larger standard deviation S indicates a greater difference in the pressure values ​​monitored at each monitoring point. Since the side guards are mostly flat, this means that the coal wall has greater undulations and the fit between the side guards and the coal wall is poorer. Conversely, a smaller standard deviation S indicates a smaller difference in the pressure values ​​monitored at each monitoring point, meaning that the coal wall is smoother and the fit between the side guards and the coal wall is better.

[0057] Therefore, by comparing the two indicators, the average pressure P and the standard deviation S, with the corresponding threshold parameters, the quality of the protective lining can be easily distinguished. The overall judgment process is simple, convenient, efficient, and has high judgment accuracy.

[0058] In some embodiments, multiple pressure average values ​​P can be obtained over a certain period of time. The trend of the change in the magnitude of the pressure average value P can provide an early warning of whether the coal wall is prone to spalling. For example, if multiple pressure average values ​​P show an increasing trend over time, it can be determined that the coal wall is protruding outward and resisting the protective plate, indicating that there is a risk of spalling.

[0059] In some embodiments, the siding quality evaluation method further includes step S5: if it is determined that the siding quality does not meet the requirements, the non-compliance is classified, and then corresponding siding improvements are made for each category. This allows for targeted improvement measures to be implemented for different siding conditions, ensuring that the improvement process is purposeful and fully guaranteeing the quality of subsequent siding operations.

[0060] In some embodiments, step S5 includes the following steps:

[0061] S51: Classify the cases where the quality of the protective lining does not meet the requirements based on the comparison results of the average pressure P and the average pressure threshold PL, and the comparison results of the standard deviation S and the standard deviation threshold SL.

[0062] S52: If the average pressure P is not less than the average pressure threshold PL and the standard deviation S is greater than the standard deviation threshold SL, then it is identified as the first case (i.e., the general condition of the side protection quality) and it is determined that the side protection force applied by the side protection plate meets the requirements. At this time, the coal wall is uneven and has large undulations. The side protection plate and the coal wall cannot fit well together, and there is a problem of easy coal leakage in some areas.

[0063] If the average pressure P is less than the average pressure threshold PL and the standard deviation S is not greater than the standard deviation threshold SL, then it is identified as the second case (i.e., the side protection quality is good) and it is determined that the side protection force applied by the side protection plate does not meet the requirements. At this time, the coal wall is flat and the side protection plate has good adhesion.

[0064] If the average pressure P is less than the average pressure threshold PL, and the standard deviation S is greater than the standard deviation threshold SL, then it is identified as the third case (i.e., the case of poor side protection quality) and it is determined that the side protection force applied by the side protection plate does not meet the requirements. At the same time, the coal wall is uneven, with large undulations, and there is a problem of easy coal leakage in some areas.

[0065] In some embodiments, when the first situation described above occurs, the side protection is improved by increasing the flatness of the coal wall during the next coal cut and enhancing the timeliness of the side protection. This avoids large subsequent undulations in the coal wall and ensures that the side protection plate can adhere well to the coal wall when the supplied support force is applied. The timely adhesion of the side protection plate to the coal wall prevents localized coal wall detachment and unevenness, further ensuring the flatness of the coal wall.

[0066] When the second situation described above occurs, the side protection is improved by increasing the contact pressure between the side protection plate and the coal wall. Specifically, this can be achieved by adjusting the hydraulic force of the side protection cylinder, thereby avoiding a situation where the subsequent side protection force is still insufficient.

[0067] When the third situation described above occurs, the side protection is improved by increasing the flatness of the coal wall during the next cut, enhancing the timeliness of side protection, and increasing the contact pressure between the side protection plate and the coal wall. This multi-faceted adjustment of the side protection fully ensures the quality of subsequent side protection.

[0068] In some embodiments, the side guard plate includes a plate body 1, a sensing component 3, and an interface 2. The plate body 1 has a mounting cavity 13 and an opening 11, the opening 11 communicating with the mounting cavity 13. For example, as Figure 2 As shown, the plate 1 can be generally flat, and the mounting cavity 13 can be disposed within the plate 1. The opening 11 can be disposed in the cavity wall of the mounting cavity 13, specifically, as shown... Figure 3 and Figure 4 As shown, the opening 11 can be located on the rear side of the plate 1, the front end of the opening 11 can communicate with the mounting cavity 13, and the rear end of the opening 11 can communicate with the outer surface of the plate 1.

[0069] like Figure 5 As shown, the sensing component 3 is disposed within the mounting cavity 13, and the sensing component 3 includes an optical fiber 31 and two fixing plates 32. Both fixing plates 32 can be flat and can be arranged opposite each other in the front-to-back direction. The optical fiber 31 is disposed between the two fixing plates 32 and can bend and extend along the cavity between the two fixing plates 32. Figure 6 As shown, the optical fiber 31 is provided with a plurality of gratings 33, which are arranged at intervals along the extension direction of the optical fiber 31. For example, the plurality of gratings 33 can be arranged at equal intervals along the extension direction of the optical fiber 31.

[0070] Each grating 33 is used to deform when the plate 1 deforms to output monitoring information. Specifically, under actual working conditions, the temperature and pressure of the plate 1 will cause the plate 1 to deform. The deformation at the corresponding position of the plate 1 will be transmitted to the corresponding grating 33 and cause the grating 33 to deform. The deformed grating 33 will reflect different wavelengths of broadband light. By utilizing the difference in light wave reflection, corresponding monitoring information can be generated, thereby enabling the measurement of temperature, pressure, displacement, etc. It should be noted that each grating on the optical fiber forms the above-mentioned monitoring point, and the gratings meet the data acquisition requirements.

[0071] The above arrangement can monitor multiple measurement points over a large area of ​​the plate 1 using a single optical fiber 31. Compared with the existing technology, which requires multiple sensors and wires to be connected to each sensor, this reduces the complexity of the structural arrangement and the overall cost.

[0072] The fixing plate 32 is provided with a through hole 321, which is arranged opposite to the opening 11 so that the optical fiber 31 can pass through the through hole 321 and the opening 11. For example, Figure 6 As shown, the perforation 321 can be a waist-shaped hole, and the length direction of the perforation 321 can be vertical. During installation, the perforation 321 can be arranged directly opposite the opening 11 on the plate 1. Thus, the optical fiber 31 in the mounting cavity 13 can extend to the outside of the plate 1 through the perforation 321 and the opening 11 in sequence, thereby facilitating the external connection and installation of the optical fiber 31.

[0073] Interface 2 is fixed at the opening 11 of the board 1, and interface 2 is connected to optical fiber 31. For example, as Figure 3 As shown, interface 2 can be fixed in the opening 11 of plate 1 by means of threaded assembly, plug-in fixing, etc., and the end of optical fiber 31 can be connected to interface 2. In use, interface 2 can be connected to an external armored optical cable, which in turn is connected to a demodulator. The demodulator can convert the monitoring information monitored by the grating 33 on optical fiber 31 into data such as strain, thereby facilitating the acquisition of intuitive monitoring parameters and data.

[0074] The side guard plate of this invention has a wide overall monitoring range, which enables the hydraulic support to obtain more comprehensive monitoring data. This facilitates the analysis and research of the stress and deformation of each side guard plate during mining operations, and is conducive to realizing the intelligent operation of the hydraulic support.

[0075] In some embodiments, the plate body 1 includes two mounting plates 12 arranged opposite to each other, and at least one of the two mounting plates 12 has a groove 122 on its sidewall facing each other, the interior space of the groove 122 forming a mounting cavity 13.

[0076] For example, such as Figure 5 As shown, both mounting plates 12 can be made of steel plates and can be arranged opposite each other in the front-to-back direction. A groove 122 can be provided on the rear mounting plate 12. Specifically, the groove 122 is located on the front side of the rear mounting plate 12, and the groove 122 is generally a rectangular groove. When the two mounting plates 12 are stacked, the opening of the groove 122 is sealed by the front mounting plate 12, and the space within the groove 122 forms the aforementioned mounting cavity 13. During assembly, the sensing component 3 can be embedded in the mounting cavity 13. The separate arrangement of the two mounting plates 12 facilitates the installation and arrangement of the sensing component 3.

[0077] In some other embodiments, each of the two mounting plates 12 may be provided with a groove 122. After the two mounting plates 12 are stacked, the slots of the grooves 122 on the two mounting plates 12 are arranged opposite to each other. At this time, a part of the sensing component 3 can be embedded in the groove 122 of one mounting plate 12, and another part of the sensing component 3 can be embedded in the groove 122 of the other mounting plate 12.

[0078] In some embodiments, one of the mounting plates 12 has a contact surface 121 for contacting the coal wall, the mounting cavity 13 is arranged in parallel with the contact surface 121 and extends along the contact surface 121, and the thickness of the mounting cavity 13 is not less than the thickness of the sensing component 3 in the normal direction of the contact surface 121.

[0079] For example, such as Figure 5 As shown, the contact surface 121 can be the front surface of the mounting plate 12 located on the front side. The contact surface 121 is generally planar. In use, the contact surface 121 can be located in a vertical plane and used to make contact with the coal wall of the working face. The mounting cavity 13 can be a flat cavity. The mounting cavity 13 can be located on the rear side of the contact surface 121 and is also generally located in a vertical plane. Therefore, when the contact surface 121 is subjected to pressure, the sensing component 3 in the mounting cavity 13 will also be subjected to a similar pressure, thereby meeting the need for pressure bearing in a large area.

[0080] like Figure 7 As shown, the sensing component 3 can be flat, and its thickness can be t. Figure 8 and Figure 9 As shown, the groove 122 can be formed only on the rear mounting plate 12, and the thickness of the mounting cavity 13 can be regarded as the groove depth of the groove 122, that is, Figure 9The dimension T in the middle can be slightly larger than the aforementioned dimension t, which facilitates the placement of the sensing component 3 in the mounting cavity 13. This avoids the situation where the space inside the mounting cavity 13 is too cramped, which could easily cause the sensing component 3 to be squeezed and deformed. This also avoids the problem of installation deviation caused by squeezing the sensing component 3, which could easily lead to subsequent monitoring errors. When there are multiple protective plates, it is beneficial to ensure the matching degree of measurement results of different protective plates, thereby fully ensuring the accuracy and precision of monitoring.

[0081] In some embodiments, at least part of the mounting cavity 13 is bent and extended, and both fixing plates 32 can be bent and deformed to make the sensing component 3 bendable. For example, the side plate can also be a rod-shaped structure, in which case the mounting cavity 13 can be an annular cavity or a chamber with a certain curvature in the extension direction. Both fixing plates 32 can be made of flexible materials, so that the fixing plates 32 can be bent, thereby allowing the sensing component 3 to adapt to the curvature changes of the mounting cavity 13 by bending.

[0082] In some embodiments, the optical fiber 31 is spirally coiled or bent repeatedly in a plane parallel to the contact surface 121, and a plurality of gratings 33 are evenly distributed in the plane parallel to the contact surface 121. For example, as Figure 10 As shown, optical fiber 31 can extend in a serpentine bend within the same plane. In some other embodiments, such as... Figure 11 As shown, the optical fiber 31 can also extend in a spiral shape within the same plane. This fully ensures the uniformity of the distribution of multiple gratings 33, thereby ensuring the effectiveness of monitoring at different locations within the same area.

[0083] In some embodiments, the two mounting plates 12 are fitted and sealed together, and the mounting cavity 13 is filled with a filler material between the sensing component 3 and the cavity wall of the mounting cavity 13. For example, after the sensing component 3 is installed in the mounting cavity 13 between the two mounting plates 12, the two mounting plates 12 can be connected and fixed by welding. The filler material can be pre-embedded or introduced into the mounting cavity 13 through the opening 11.

[0084] The filler material serves two purposes: firstly, it fills the gap between the sensing component 3 and the cavity wall of the mounting cavity 13, thus ensuring the stability of the assembly of the sensing component 3; secondly, the filler material also serves to transmit force, that is, the force applied to the side plate can be first transmitted to the filler material, and then directly act on the sensing component 3 through the filler material, thus ensuring the effectiveness of force transmission and improving the accuracy and precision of monitoring.

[0085] Alternatively, the filler can be a structural adhesive or other material, which can also serve to bond and fix the sensing component 3.

[0086] In some embodiments, the material of the fixing plate 32 includes at least one of the following: fiberglass board, carbon fiber board, steel plate, lining cloth, rubber, and polyurethane.

[0087] In some embodiments, the two fixing plates 32 are made of different materials, and at least one of the two fixing plates 32 is flexibly deformable. For example, as Figure 7 As shown, the two fixing plates 32 can be a first plate 322 and a second plate 323, respectively. The first plate 322 can be made of a relatively hard material, such as fiberglass board, carbon fiber board, thin steel plate, stainless steel plate, etc., while the second plate 323 can be made of a relatively soft material, such as lining cloth, rubber, etc. The flexible fixing plate 32 has energy absorption and buffering functions, and provides a certain degree of protection for the internal optical fiber 31 and grating 33.

[0088] In some embodiments, the two fixing plates 32 can be connected and fixed by means of vacuum adsorption, gluing or other methods, and the optical fiber 31 can be glued and fixed between the two fixing plates 32.

[0089] The hydraulic support of this invention includes a side plate, and the sensing component 3 is pre-embedded in the side plate to be monitored, realizing real-time, multi-point deformation and stress monitoring. Furthermore, it abandons the existing method of monitoring the pressure in the lower chamber of the hydraulic cylinder, directly measuring the deformation and stress of key parts of the support side plate, resulting in a more direct measurement method and more accurate data.

[0090] Secondly, it can collect data from multiple points within a certain area, resulting in a large and more comprehensive data acquisition volume. In addition, the optical fiber 31 is embedded in two steel plates (mounting plate 12), which are welded together, providing better protection for the optical fiber 31 and making it less prone to breakage.

[0091] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0092] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0093] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0094] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0095] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0096] Although the above embodiments have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Any changes, modifications, substitutions and variations made to the above embodiments by those skilled in the art are within the protection scope of the present invention.

Claims

1. A method for evaluating the quality of working face side protection, characterized in that, Based on the side protection board, which is equipped with multiple monitoring points, the side protection quality evaluation method includes the following steps: S1: Obtain multiple pressure values ​​P1, P2, and P3 at a set time through multiple monitoring points on the side panel. 、Pn; S2: Through multiple pressure values ​​P1, P2, ... Pn calculates the average pressure P and standard deviation S; S3: Determine the mean pressure threshold PL and the standard deviation threshold SL; S4: Compare the average pressure P with the average pressure threshold PL, and compare the standard deviation S with the standard deviation threshold SL; If the average pressure P is not less than the average pressure threshold PL and the standard deviation S is not greater than the standard deviation threshold SL, then the quality of the protective lining is determined to meet the requirements. If the average pressure P is less than the average pressure threshold PL, and the standard deviation S is greater than the standard deviation threshold SL, then the quality of the protective lining is determined to be unacceptable.

2. The method for evaluating the quality of working face side protection according to claim 1, characterized in that, It also includes step S5: if it is determined that the quality of the protective lining does not meet the requirements, the cases of non-compliance of the protective lining quality are classified, and then corresponding improvements are made to the protective lining for each case.

3. The method for evaluating the quality of working face side protection according to claim 2, characterized in that, Step S5 includes the following steps: S51: Classify the cases where the quality of the protective lining does not meet the requirements based on the comparison results of the average pressure P and the average pressure threshold PL, and the comparison results of the standard deviation S and the standard deviation threshold SL. S52: If the average pressure P is not less than the average pressure threshold PL, and the standard deviation S is greater than the standard deviation threshold SL, then it is identified as the first case and the support force meets the requirements, the coal wall is uneven, and local coal leakage is easy. If the average pressure P is less than the average pressure threshold PL and the standard deviation S is not greater than the standard deviation threshold SL, then it is identified as the second case and the support force is not up to standard, and the coal wall has good flatness and fit. If the average pressure P is less than the average pressure threshold PL, and the standard deviation S is greater than the standard deviation threshold SL, then it is identified as the third case and it is determined that the support force does not meet the requirements, the coal wall is uneven, and local coal leakage is likely.

4. The method for evaluating the quality of working face side protection according to claim 3, characterized in that, When the first situation mentioned above occurs, the side protection is improved by increasing the flatness of the coal wall in the next coal cut and enhancing the timeliness of side protection. When the second situation mentioned above occurs, the side protection is improved by increasing the contact pressure between the side protection plate and the coal wall. When the third situation mentioned above occurs, the side protection is improved by increasing the flatness of the coal wall in the next coal cut, enhancing the timeliness of the side protection, and increasing the contact pressure of the side protection plate against the coal wall.

5. The method for evaluating the quality of working face side protection according to any one of claims 1-4, characterized in that, The side panel includes: The plate body has an installation cavity inside; A sensing component is disposed within the mounting cavity. The sensing component includes an optical fiber and two fixing plates. The optical fiber is disposed between the two fixing plates and extends in a bent manner. Multiple gratings are provided on the optical fiber. The multiple gratings are arranged at intervals along the extension direction of the optical fiber. Each grating is used to deform when the plate body deforms in order to output monitoring information and form the monitoring point.

6. The method for evaluating the quality of working face side protection according to claim 5, characterized in that, The plate includes two mounting plates arranged opposite each other, and at least one of the two mounting plates has a groove on its sidewall facing each other, the interior space of the groove forming the mounting cavity.

7. The method for evaluating the quality of working face side protection according to claim 6, characterized in that, One of the mounting plates has a contact surface for contacting the coal wall, the mounting cavity is arranged parallel to the contact surface and extends along the contact surface, and the thickness of the mounting cavity is not less than the thickness of the sensing component in the normal direction of the contact surface.

8. The method for evaluating the quality of working face side protection according to claim 7, characterized in that, At least a portion of the mounting cavity is bent and extended, and both of the fixing plates are bendable to make the sensing assembly bendable; And / or, the optical fiber is spirally coiled or bent repeatedly in a plane parallel to the contact surface, and the plurality of gratings are evenly distributed in a plane parallel to the contact surface.

9. The method for evaluating the quality of working face side protection according to claim 6, characterized in that, The two mounting plates are fitted together and sealed together. The mounting cavity is filled with a filler material, which fills the space between the sensing component and the cavity wall of the mounting cavity.

10. The method for evaluating the quality of working face side protection according to claim 5, characterized in that, The two fixing plates are made of different materials, and at least one of the two fixing plates is flexibly deformable.

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