Flexible side protection device and side protection method

Abstract

The present invention discloses a flexible side guard device and side guard method. The flexible side guard device comprises a beam body, a side guard assembly, a control module, and multiple detection components. The side guard assembly comprises a side guard plate and a drive member, the side guard plate being relatively rotatable, the drive member being connected to the side guard plate and used to drive the side guard plate to rotate, the detection component comprising an elastic member and a fiber optic Bragg grating sensor, the elastic member being connected to the side guard plate and the fiber optic Bragg grating sensor being disposed on the elastic member, and the control module being connected to the drive member and the connection portion, respectively. The flexible side guard device of an embodiment of the present invention comprises an elastic member disposed on the side guard plate, the elastic member being used to transmit a supporting force between the side guard plate and the coal wall, and adapting to the undulations of the coal wall to support the coal wall. A fiber optic Bragg grating sensor is disposed between the elastic member and the side guard plate, thereby timely extracting pressure information between the coal wall and the side guard plate and deformation information of the coal wall, thereby promptly driving the side guard plate to fill the unsupported space in the coal wall.

Description

Technical Field

[0001] The present invention relates to the technical field of mining supports, in particular to a flexible support device and a support method. Background Art

[0002] Hydraulic support guards are one of the primary means of controlling coal wall spalling. By adhering closely to the coal wall, they exert a supporting force to prevent spalling. Even if spalling does occur, the guards prevent the spalled coal from entering pedestrian access and prevent further expansion. Therefore, guards should be installed when the tunnel height is 3.5m or greater.

[0003] In coal seams with good occurrence conditions and technical conditions, the coal wall after shearer mining is relatively flat, and the side guards can effectively transfer the supporting force to the coal wall in the form of surface loads, thereby effectively controlling coal wall deformation and improving coal wall stability. However, in coal seams with poor occurrence conditions or technical conditions, the coal wall after shearer mining is often uneven and undulating. The side guards usually make line contact or even point contact with the coal wall, resulting in a large amount of unsupported space between the side guards and the coal wall, causing stress concentration and disturbance damage.

[0004] In the related technologies, the contact relationship between the coal wall and the supporting structure is not monitored comprehensively, in real time and accurately, resulting in the lack of targeted control strategies for the supporting structure and the inability to fill the unsupported space caused by coal wall damage in a timely manner. Summary of the Invention

[0005] The present invention aims to solve one of the technical problems in the related art at least to a certain extent.

[0006] To this end, an embodiment of the present invention proposes a flexible wall protection device, which can dynamically monitor the pressure and deformation information of the coal wall and promptly fill the unsupported space caused by the destruction of the coal wall.

[0007] The flexible guard device of the embodiment of the present invention includes: a beam body, a guard assembly, a control module and multiple detection assemblies, the guard assembly includes multiple guard plates and multiple driving members, the multiple guard plates are spaced in sequence along the vertical direction and connected end to end, any two adjacent guard plates can rotate relative to each other, wherein the guard plate located on the top layer is also rotatably connected to the beam body, the multiple driving members correspond to and are connected to the multiple guard plates one by one, the driving members are used to drive the guard plates to rotate, the multiple detection assemblies correspond to the multiple guard plates one by one, the detection assembly includes an elastic member and a fiber grating sensor, the elastic member and the The corresponding guard plate is connected, the fiber grating sensor is arranged on the elastic member, and the fiber grating sensor has a force detection part, a temperature compensation part and a connection part. At least part of the force detection part is located between the elastic member and the guard plate. The force detection part is used to collect force information between the guard plate and the coal wall. The temperature compensation part is arranged outside the elastic member. The collected information of the temperature compensation part is used as a measurement reference. The control module is respectively connected to the driving member and the connection part. The control module is used to receive information transmitted by the force detection end and the temperature compensation end to control the start and stop of the driving member.

[0008] The flexible guard device of this embodiment of the present invention employs an elastic member installed on the guard plate. The elastic member is used to transmit support force between the guard plate and the coal wall, adapting to the undulations of the coal wall to provide support. A fiber Bragg grating sensor is installed between the elastic member and the guard plate to timely detect pressure between the coal wall and the guard plate, as well as deformation information of the coal wall, thereby actuating the guard plate to fill the unsupported space in the coal wall.

[0009] In some embodiments, the beam body includes a support frame, a telescopic beam and a telescopic beam driving member, the telescopic beam is movably arranged on the support frame along the horizontal direction, the telescopic beam driving member is arranged on the support frame, and the telescopic beam driving member is connected to the telescopic beam to drive the telescopic beam to move.

[0010] In some embodiments, the plurality of guard plates are defined as first-level guard plates, second-level guard plates...N-level guard plates from top to bottom, the head end of the first-level guard plate is rotatably connected to the telescopic beam, the tail end of the first-level guard plate is rotatably connected to the head end of the second-level guard plate...the tail end of the N-1-level guard plate is rotatably connected to the head end of the N-level guard plate; the plurality of driving members are defined as first-level driving members, second-level driving members...N-level driving members from top to bottom, the first-level driving member is provided on the telescopic beam and connected to the first-level guard plate, the second-level driving member is provided on the first-level guard plate and connected to the second-level guard plate...the N-level driving member is provided on the N-1-level guard plate and connected to the N-level guard plate.

[0011] In some embodiments, the relative rotation angle between any two adjacent side guard plates ranges from 5° to 180°.

[0012] In some embodiments, the first-stage driving member, the second-stage driving member, ... the N-stage driving member, and the telescopic beam driving member are all jacks.

[0013] In some embodiments, the detection component also includes a plate, a first groove is provided on the end face of the elastic member close to the guard plate, the plate is arranged in the first groove, a spiral second groove is provided at the bottom of the first groove, and the force detection part is evenly distributed in the second groove.

[0014] In some embodiments, both the side guard plate and the plate are provided with through holes, the through holes of the side guard plate correspond to the through holes of the plate, and the connecting portion passes through the through holes of the plate and the through holes of the side guard plate in sequence.

[0015] In some embodiments, the detection component further includes a protective shell, which is disposed on an outer peripheral wall of the elastic member, and the temperature compensation portion is located inside the protective shell.

[0016] In some embodiments, the control module includes a connected fiber optic Bragg grating demodulator and a driving host, the connecting part is connected to the fiber optic Bragg grating demodulator, and the driving host is connected to the first-stage driving component, the second-stage driving component...the N-th stage driving component and the telescopic beam driving component.

[0017] An embodiment of the present invention further provides a side protection method using the flexible side protection device described in any of the above embodiments.

[0018] The protection method of the embodiment of the present invention includes:

[0019] The lower limit of the contact force between the guard plate and the coal wall is set to Fmin, and the strain signal gain generated by the fiber Bragg grating sensor when subjected to the force Fmin is εmin;

[0020] The force detection part within the range of the guard plate collects force information in the form of distributed measuring points. When more than half of the measuring points do not reach the strain signal gain εmin, it is considered that the guard plate is not tightly fitted to the coal wall. At this time, the driving part reaches the starting working threshold, and the driving part drives the guard plate to rotate until more than half of the measuring points reach the strain signal gain εmin, at which time the driving part stops running. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 1 is a first schematic diagram of a flexible side guard device according to an embodiment of the present invention.

[0022] Figure 2 2 is a second schematic diagram of the flexible side guard device according to an embodiment of the present invention.

[0023] Figure 3 It is an exploded schematic diagram of a partial structure of a flexible side guard device according to an embodiment of the present invention.

[0024] Reference numerals:

[0025] Beam body 1, support frame 11, telescopic beam 12, telescopic beam driving member 13,

[0026] Guard assembly 2, first-stage guard plate 21, second-stage guard plate 22, third-stage guard plate 23, first-stage drive member 24, second-stage drive member 25, third-stage drive member 26,

[0027] Detection assembly 3 , elastic member 31 , fiber Bragg grating sensor 32 , force detection portion 321 , temperature compensation portion 322 , connection portion 323 , plate 33 , protective shell 34 . DETAILED DESCRIPTION

[0028] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0029] The flexible side guard device according to the embodiment of the present invention will be described below with reference to the accompanying drawings.

[0030] like Figures 1 to 3 As shown, the flexible side guard device of the embodiment of the present invention includes: a beam body 1, a side guard assembly 2, multiple detection assemblies 3, and a control module (not shown in the figure).

[0031] like Figure 1 and Figure 2As shown, the guard assembly 2 includes multiple guard plates and multiple driving members. The guard plates are spaced vertically and connected end-to-end. Any two adjacent guard plates can rotate relative to each other. The guard plates on the top layer are also rotatably connected to the beam body 1. Specifically, the connection 323 between the topmost guard plate and the beam body 1, as well as the connection 323 between any two adjacent guard plates in the lower layers, serve as rotating elements. Multiple driving members are connected to and correspond to the guard plates, driving the rotation of the corresponding guard plates. The driving members can be thrust elements such as jacks and push rods.

[0032] like Figures 1 to 3 As shown, multiple detection assemblies 3 correspond one-to-one with multiple side guards. Each detection assembly 3 includes an elastic member 31 and a fiber Bragg grating sensor 32. The elastic member 31 is connected to its corresponding side guard, and the fiber Bragg grating sensor 32 is mounted on the elastic member 31. The fiber Bragg grating sensor 32 comprises a force detection portion 321, a temperature compensation portion 322, and a connection portion 323. At least a portion of the force detection portion 321 is located between the elastic member 31 and the side guard, while the temperature compensation portion 322 is located outside the elastic member 31.

[0033] It can be understood that the coal wall and the guard plate are in indirect contact. By setting an elastic member 31 between the coal wall and the guard plate, the elastic member 31 is used for flexible guarding. The elastic member 31 is a super elastic body such as rubber and polyurethane.

[0034] The force detection unit 321 is used to collect information about the forces acting between the guard plate and the coal wall. When the guard plate supports the coal wall, the elastic member 31 is subjected to compressive force, which is transmitted to the force detection unit 321. Based on the force information collected by the force detection unit 321, the support effectiveness of the guard plate on the coal wall is determined. For example, if the force detection unit 321 detects force information, it is determined that the guard plate is in contact with the coal wall and is providing support. Conversely, if the force detection unit 321 does not detect force information, it is determined that the support is not providing support.

[0035] The information collected by the temperature compensation unit 322 serves as a measurement benchmark. Since the fiber Bragg grating sensor 32 is a sensitive detection device, changes in its signal are primarily affected by two factors: temperature and force. The fiber Bragg grating sensor 32 of the flexible support device of the present embodiment is designed to measure changes in mechanical quantities, and therefore must eliminate interference from temperature changes during measurement.

[0036] Therefore, the force detection unit 321 and the temperature compensation unit 322 are both in the same environment (inside the tunnel), ensuring the same initial temperature. The temperature compensation unit 322 is located outside the elastic member 31 to protect it from compression by the coal wall. This allows the unit to be considered as being affected only by temperature fluctuations, thus serving as the measurement benchmark. The signal value of the temperature compensation unit 322 is subtracted from the signal value of the force detection unit 321 to obtain the mechanical change value unaffected by temperature, i.e., the final pressure change value.

[0037] Furthermore, the force detection portion 321 has a plurality of detection segments, and the plurality of detection segments are evenly distributed between the elastic member 31 and the guard plate, so as to evenly detect the contact relationship between the coal wall and the guard plate, and avoid insufficient contact between the guard plate and the coal wall (in the form of line contact or point contact). For example, the lower limit of the contact force between the guard plate and the coal wall is set to Fmin, and the strain signal gain generated by any detection segment when subjected to the Fmin force is εmin. If more than half of the detection segments do not reach the strain signal gain εmin, it is considered that the guard plate and the coal wall are not in sufficient contact. At this time, the guard plate can be rotated until more than half of the detection segments reach the strain signal gain εmin, and the guard plate and the coal wall are in a state of sufficient contact.

[0038] The control module is connected to the driving element and the connecting portion 323 of the fiber grating sensor 32 respectively. The control module is used to receive information transmitted by the force detection end and the temperature compensation end to control the start and stop of the driving element.

[0039] It can be understood that the control module receives the signal values ​​of each detection segment of the force detection part 321 and the signal value of the temperature compensation part 322, performs calculations, subtracts the signal value of the temperature compensation part 322 from the signal value of the detection segment to obtain the signal gain value of the point, and then controls the start and stop of the driving part according to the number of detection points.

[0040] Thus, the flexible guard device of the embodiment of the present invention employs an elastic member 31 disposed on the guard plate. The elastic member 31 is used to transmit a supporting force between the guard plate and the coal wall, adapting to the undulations of the coal wall to support the coal wall. A fiber Bragg grating sensor 32 is disposed between the elastic member 31 and the guard plate to promptly detect pressure between the coal wall and the guard plate, as well as deformation information of the coal wall, thereby actuating the guard plate to fill the unsupported space in the coal wall.

[0041] In some embodiments, as Figure 1 and Figure 2 As shown, the beam body 1 includes a support frame 11, a telescopic beam 12 and a telescopic beam driver 13. The telescopic beam 12 is movably arranged on the support frame 11 in the horizontal direction, and the telescopic beam driver 13 is arranged on the support frame 11 and connected to the telescopic beam 12 to drive the telescopic beam 12 to move.

[0042] The plurality of guard plates are defined, from top to bottom, as a first-stage guard plate 21, a second-stage guard plate 22, and so on. The leading end of the first-stage guard plate 21 is rotatably connected to the telescopic beam 12, the trailing end of the first-stage guard plate 21 is rotatably connected to the leading end of the second-stage guard plate 22, and so on. The trailing end of the N-1th-stage guard plate is rotatably connected to the leading end of the Nth-stage guard plate.

[0043] The multiple driving elements are defined, from top to bottom, as a first-stage driving element 24, a second-stage driving element 25, and so on. The first-stage driving element 24 is disposed on the telescopic beam 12 and connected to the first-stage side guard plate 21. The second-stage driving element 25 is disposed on the first-stage side guard plate 21 and connected to the second-stage side guard plate 22. The Nth-stage driving element is disposed on the N-1th-stage side guard plate and connected to the Nth-stage side guard plate.

[0044] It is understood that the number of guard plates and their associated drivers is defined based on the roadway height to meet the needs of actual working conditions. Real-time, coordinated dynamic adjustment is achieved using the telescopic beam driver 13 and the drivers of each level of guard plates to prevent the impact and damage to the coal wall caused by sudden activation of the guard plates. This allows the guard assembly 2 to dynamically and actively support the coal wall and promptly fill the unsupported space caused by coal wall spalling.

[0045] Specifically, if Figure 1 and Figure 2 As shown, there are three guard plates, namely, from top to bottom, a first-stage guard plate 21, a second-stage guard plate 22, and a third-stage guard plate 23. The upper end of the first-stage guard plate 21 is hinged to the left end of the telescopic beam 12 via an ear seat, the lower end of the first-stage guard plate 21 is hinged to the upper end of the second-stage guard plate 22 via an ear seat, and the lower end of the second-stage guard plate 22 is hinged to the upper end of the third-stage guard plate 23 via an ear seat.

[0046] There are three driving members: from top to bottom, the first-stage driving member 24, the second-stage driving member 25, and the third-stage driving member 26. The right end of the first-stage driving member 24 is hinged to the lower end surface of the telescopic beam 12 via an ear seat, and the left end of the first-stage driving member 24 is hinged to the right end surface of the first-stage guard plate 21 via an ear seat. The upper end of the second-stage driving member 25 is hinged to the right end surface of the first-stage guard plate 21 via an ear seat, and the lower end of the second-stage driving member 25 is hinged to the right end surface of the second-stage guard plate 22 via an ear seat. The upper end of the third-stage driving member 26 is hinged to the right end surface of the second-stage guard plate 22 via an ear seat, and the lower end of the third-stage driving member 26 is hinged to the right end surface of the third-stage guard plate 23 via an ear seat.

[0047] For example, the length of the first-level side guard plate 21 is 900-1000 mm, the length of the second-level side guard plate 22 is 1200-1300 mm, and the length of the third-level side guard plate 23 is 900-1000 mm.

[0048] Furthermore, the first-stage guard plate and the telescopic beam 12 can rotate relative to each other by 5°-180°, and the angle range of relative rotation between any two adjacent guard plates is 5°-180°. Figure 2 As shown, the first-level guard plate 21 can be flipped to the left and deflected to the right relative to the telescopic beam 12, the second-level guard plate 22 can be deflected to the right relative to the first-level guard plate 21, and the third-level guard plate 23 can be deflected to the right relative to the second-level guard plate 22.

[0049] Specifically, the first-stage drive element 24, the second-stage drive element 25, ..., the Nth-stage drive element, and the telescopic beam drive element 13 are all jacks. Therefore, according to the contact between the coal wall and the side guard assembly 2, the fluid supply to the telescopic beam 12 jack and the jacks of each level of side guard plate is adjusted in a timely manner to optimize the contact.

[0050] In some embodiments, as Figures 1 to 3 As shown, the detection assembly 3 also includes a plate 33. The end surface of the elastic member 31 close to the guard plate (such as Figure 3 A first groove (not shown in the figure) is provided on the right end surface of the middle guard plate, and the first groove extends in the left-right direction. The plate 33 is arranged in the first groove, and a spiral second groove is provided at the bottom of the first groove. The force detection part 321 is evenly distributed in the second groove, that is, the force detection part 321 is also spiral, which improves the uniformity of the detection.

[0051] Optionally, the plate 33 is made of glass fiber or thin steel plate. The tube fiber Bragg grating sensor 32 can be tightly fitted to the plate 33 and cast in a superelastic body (elastic member 31 ) such as rubber or polyurethane to protect the fiber Bragg grating sensor 32 .

[0052] Further, if Figure 3 As shown, both the side guard plate and the plate 33 are provided with through holes. The through holes of the side guard plate and the through holes of the plate 33 correspond in the left-right direction. The connecting portion 323 of the fiber grating sensor 32 sequentially passes through the through holes of the plate 33 and the through holes of the side guard plate to facilitate connection with the control module.

[0053] In some embodiments, as Figures 1 to 3 As shown, the detection component 3 further includes a protective shell 34 , which is provided on the outer peripheral wall of the elastic member 31 , and the temperature compensation portion 322 is located in the protective shell 34 to protect the temperature compensation portion 322 of the fiber grating sensor 32 .

[0054] Specifically, if Figure 3As shown, in the detection assembly 3 corresponding to the first-stage side guard plate 21, the temperature compensation portion 322 of the fiber Bragg grating sensor 32 extends from the top of the elastic member 31, the protective shell 34 is connected to the upper side wall of the elastic member 31, and the right end surface of the protective shell 34 is provided with a receiving groove. In the detection assembly 3 corresponding to the second-stage side guard plate 22, the temperature compensation portion 322 of the fiber Bragg grating sensor 32 extends from the front side of the elastic member 31, the protective shell 34 is connected to the front side wall of the elastic member 31, and the right end surface of the protective shell 34 is provided with a receiving groove. In the detection assembly 3 corresponding to the third-stage side guard plate 23, the temperature compensation portion 322 of the fiber Bragg grating sensor 32 extends from the front side of the elastic member 31, the protective shell 34 is connected to the front side wall of the elastic member 31, and the right end surface of the protective shell 34 is provided with a receiving groove.

[0055] In some embodiments, the control module includes a connected fiber optic Bragg grating demodulator and a driving host, the connecting portion 323 is connected to the fiber optic Bragg grating demodulator, and the driving host is connected to the first-stage driving component 24, the second-stage driving component 25...the N-th stage driving component and the telescopic beam driving component 13.

[0056] It is understood that the deformation of the elastic member 31 causes the force detection portion 321 of the optical fiber sensor inside it to deform, thereby collecting deformation information at multiple points on the coal wall. The fiber Bragg grating demodulator extracts pressure information between the coal wall and the guard plate by calibrating the relationship between deformation and force. The drive host dynamically monitors the pressure and deformation information of the coal wall, forming a contact pressure cloud map and a coal wall deformation cloud map between the coal wall and the guard plate assembly 2, and issuing early warnings for areas with poor stability and high risk of damage. Based on the contact conditions between the coal wall and the guard plate assembly 2, an electro-hydraulic control valve is used to coordinate and dynamically adjust the fluid supply of the telescopic beam 12 jacks and the jacks of each level of the guard plate in real time to optimize the contact conditions.

[0057] The following describes the protective method according to an embodiment of the present invention.

[0058] The side protection method of the embodiment of the present invention can be used for the flexible side protection device in any of the above embodiments.

[0059] The protection method of the embodiment of the present invention includes:

[0060] The lower limit of the contact force between the guard plate and the coal wall is set to Fmin, and the strain signal gain generated by the fiber grating sensor 32 when it is subjected to the force Fmin is εmin.

[0061] The force detection unit 321 within the range of the guard plate collects force information in the form of distributed measuring points. When more than half of the measuring points do not reach the strain signal gain εmin, it is considered that the guard plate is not tightly fitted to the coal wall. At this time, the driving part reaches the starting working threshold, and the driving part drives the guard plate to rotate until more than half of the measuring points reach the strain signal gain εmin, at which time the driving part stops running.

[0062] It should be understood that when the guard plate is not working effectively, the force on the guard plate is 0, recorded as F0. The optical signals of the force detection unit 321 and the temperature compensation unit 322 of the fiber Bragg grating sensor 32 are collected, and the strain signal response values ​​of the force detection unit 321 and the temperature compensation unit 322 are subtracted. The difference data P0 is used as the reference contact threshold of the guard plate. The force detection unit 321 of the fiber Bragg grating sensor 32 has a maximum force limit Fmax, which corresponds to the maximum strain signal response value Pm. The real-time strain signal response value of the guard plate when working is P, which corresponds to the force F, that is, P0 <P<Pm,F0<F<Fmax。

[0063] The telescopic beam driving member 13 drives the telescopic beam 12 to extend a certain length until the telescopic beam 12 contacts the coal wall or reaches the maximum stroke of the telescopic beam driving member 13, and then the driving member of each level drives the guard plate of each level to a state of being in contact with the coal wall.

[0064] The lower limit of the contact force between the guard plate and the coal wall is set to Fmin, and the strain signal gain generated by the fiber Bragg grating sensor 32 when subjected to the force Fmin is εmin. When the strain signal gain εmin is not reached at more than half of the measuring points, the guard plate is considered to be not in close contact with the coal wall. At this point, the guard plate's driver reaches the activation threshold, and the hydraulic system starts supplying fluid, driving the guard plate to deflect until it is in contact with the coal wall. The hydraulic system stops supplying fluid when the strain signal gain εmin is reached at more than half of the measuring points, and the guard plate's driver stops operating.

[0065] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are 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 understood as limiting the present invention.

[0066] 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 the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0067] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0068] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0069] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions 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 any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0070] Although the above embodiments have been shown and described, it is understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. Changes, modifications, substitutions and variations of the above embodiments by those skilled in the art are all within the scope of protection of the present invention.

Claims

1. A method for protecting a gang, characterized in that: The side protection method is performed using a flexible side protection device, the flexible side protection device comprising: Beam body; a side guard assembly, the side guard assembly comprising a plurality of side guard plates and a plurality of driving members, the plurality of side guard plates being spaced apart in a vertical direction and connected end to end, any two adjacent side guard plates being rotatable relative to each other, wherein the side guard plate on the top layer is further rotatably connected to the beam body, the plurality of driving members corresponding to and connected to the plurality of side guard plates, the driving members being used to drive the side guard plates to rotate; a plurality of detection assemblies, each of the plurality of detection assemblies corresponding to each of the plurality of guard plates; the detection assemblies comprising an elastic member and a fiber Bragg grating sensor; the elastic member being connected to the corresponding guard plate; the fiber Bragg grating sensor being disposed on the elastic member; the fiber Bragg grating sensor comprising a force detection portion, a temperature compensation portion, and a connection portion; at least a portion of the force detection portion being located between the elastic member and the guard plate; the force detection portion being used to collect force information between the guard plate and the coal wall; the temperature compensation portion being located outside the elastic member; and the collected information of the temperature compensation portion being used as a measurement reference; a control module, the control module being connected to the driving member and the connecting portion respectively, and being configured to receive information transmitted by the force detection portion and the temperature compensation portion to control the start and stop of the driving member; The detection assembly further includes a plate, a first groove is provided on the end surface of the elastic member close to the side guard plate, the plate is arranged in the first groove, a spiral second groove is provided at the bottom of the first groove, and the force detection parts are evenly distributed in the second groove; The protection method comprises: The lower limit of the contact force between the guard plate and the coal wall is set to Fmin, and the strain signal gain generated by the fiber Bragg grating sensor when subjected to the force Fmin is εmin; The force detection part within the range of the guard plate collects force information in the form of distributed measuring points. When more than half of the measuring points do not reach the strain signal gain εmin, it is considered that the guard plate is not tightly fitted to the coal wall. At this time, the driving part reaches the starting working threshold, and the driving part drives the guard plate to rotate until more than half of the measuring points reach the strain signal gain εmin, at which time the driving part stops running.

2. The method for protecting the skin according to claim 1, wherein: The beam body includes a support frame, a telescopic beam and a telescopic beam driving member. The telescopic beam is movably arranged on the support frame along the horizontal direction. The telescopic beam driving member is arranged on the support frame and is connected to the telescopic beam to drive the telescopic beam to move.

3. The method for protecting the skin according to claim 2, characterized in that: The plurality of guard plates are defined as a first-level guard plate, a second-level guard plate, ... an N-level guard plate, from top to bottom, wherein the leading end of the first-level guard plate is rotatably connected to the telescopic beam, the trailing end of the first-level guard plate is rotatably connected to the leading end of the second-level guard plate, ... and the trailing end of the N-1-th level guard plate is rotatably connected to the leading end of the N-level guard plate. The multiple driving members are defined as a first-level driving member, a second-level driving member...an N-th-level driving member from top to bottom, the first-level driving member is arranged on the telescopic beam and connected to the first-level guard plate, the second-level driving member is arranged on the first-level guard plate and connected to the second-level guard plate...the N-th-level driving member is arranged on the N-1-level guard plate and connected to the N-level guard plate.

4. The method for protecting the skin according to claim 1, characterized in that: The relative rotation angle between any two adjacent side guard plates is in the range of 5° to 180°.

5. The method for protecting the skin according to claim 3, characterized in that: The first-stage driving member, the second-stage driving member, ... the N-stage driving member and the telescopic beam driving member are all jacks.

6. The method for protecting the skin according to claim 1, characterized in that: The side guard plate and the plate are both provided with through holes, the through holes of the side guard plate correspond to the through holes of the plate, and the connecting portion passes through the through holes of the plate and the through holes of the side guard plate in sequence.

7. The method for protecting the skin according to claim 6, characterized in that: The detection component further includes a protective shell, which is provided on the outer peripheral wall of the elastic member, and the temperature compensation portion is located inside the protective shell.

8. The method for protecting the skin according to claim 3, characterized in that: The control module includes a connected fiber Bragg grating demodulator and a driving host, the connecting portion is connected to the fiber Bragg grating demodulator, and the driving host is connected to the first-stage driving component, the second-stage driving component...the N-th stage driving component and the telescopic beam driving component.

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