Movable air bag protection rack and control method thereof

Abstract

The invention discloses a movable air bag protection rack and a control method thereof, and belongs to the technical field of tunnel construction protection. The movable air bag protection rack comprises a walking mechanism and a supporting mechanism arranged above the walking mechanism; the supporting mechanism comprises a supporting framework, and the two ends of the supporting framework are connected with the walking mechanism respectively. The plurality of circulating rails are connected to the supporting framework; the multiple protective air bags are fixed to the circulating track and move in the conveying direction of the circulating track in a conveying mode; the conveying speed of the circulating track is matched with the moving speed of the walking mechanism, so that when the protective air bag moves to the position between the circulating track and the tunnel surrounding rock, the position between the protective air bag and the tunnel surrounding rock is relatively fixed. According to the movable air bag protection rack, the design that the protection air bag circularly moves on the circulating track is adopted, so that the technical effect that the tunnel surrounding rock can be continuously supported in the advancing process of the movable air bag protection rack can be achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of tunnel construction protection, and more specifically, to a mobile airbag protection stand and a control method thereof. Background Art

[0002] At present, the three main construction methods used in dark tunnel project construction are drilling and blasting, TBM and shield. The drilling and blasting method is widely used due to its many advantages such as long history, high maturity and relatively low cost. In addition, the drilling and blasting method has high flexibility and adaptability in the case of complex geological structure, weak and uneven surrounding rock.

[0003] When using the drilling and blasting method for dark tunnel construction, the existing technology uses a combination of protective airbags and work platforms to support the surrounding rock, using the deformation of the protective airbags to absorb the energy caused by rockbursts and falling rocks. The protective airbags are designed to have a constant resistance (the internal air pressure remains constant). After the deformation reaches a certain level, it will reach a new support equilibrium state and form effective support.

[0004] When the working platform in the prior art moves, the protective airbags move synchronously along the surrounding rock. During this process, the protective airbags lose contact with the surrounding rock. Before the detached protective airbags come into contact with the new surrounding rock in the direction of travel, the surrounding rock is in an unsupported state, which poses a safety hazard. At the same time, since the working platform often adopts a stepping movement method, the working platform needs to make a corresponding number of stepping actions according to the target moving distance of the protective airbags when moving to achieve the overall moving effect. The working platform itself has a complex structure, and the speed is slow when it moves in steps with the protective airbags, resulting in low construction efficiency. Moreover, a single protective airbag is difficult to withstand the impact caused by large deformation of the surrounding rock during rockburst. Therefore, the operating efficiency and safety of the working platform and the protective airbags under complex geological conditions still need to be improved. Summary of the invention

[0005] The purpose of the present invention is to solve the technical problem that the protective airbags on the outer side of the existing working platform have poor supporting effect on the surrounding rocks during the stepping process, and to propose a mobile airbag protective platform and a control method thereof.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A first aspect of the present invention provides a mobile airbag protection platform, comprising: a walking mechanism and a supporting mechanism arranged above the walking mechanism; the walking mechanism is used to drive the supporting mechanism to move axially along the surrounding rock of the tunnel;

[0008] The supporting mechanism comprises:

[0009] A support frame, wherein the support frame is an arched strip structure, both ends of which are respectively connected to the walking mechanism, and a plurality of the support frames are arranged in parallel along the moving direction of the walking mechanism;

[0010] Circulating tracks, a plurality of the circulating tracks are connected to the supporting frame, and the conveying direction of the circulating tracks is parallel to the moving direction of the walking mechanism;

[0011] Protective airbags, a plurality of said protective airbags are fixed on said circulating track and are transported and moved along the transport direction of said circulating track;

[0012] The transmission rate of the circulating track matches the moving rate of the walking mechanism, so that when the protective airbag moves between the circulating track and the tunnel surrounding rock, its position with respect to the tunnel surrounding rock is relatively fixed.

[0013] Furthermore, the circulating track includes:

[0014] A track body, wherein the track body is in a strip-shaped structure as a whole and is provided with a mounting opening, and a plurality of the support frames are connected to the mounting opening;

[0015] A driving device, wherein two driving devices are respectively arranged at two ends of the track body;

[0016] A chain plate is arranged around the outer sides of the two driving devices, and the chain plate is driven by the driving devices to circulate around the track body.

[0017] Furthermore, the protective airbag comprises:

[0018] A rigid base, the rigid base is located on the surface of the chain plate and is rigidly connected to the chain plate;

[0019] A flexible bladder is connected to a side of the rigid base away from the chain plate, and a cavity for accommodating gas is provided inside the flexible bladder.

[0020] Furthermore, the protective airbags on the same circulating track are evenly spaced apart; the protective airbags on adjacent circulating tracks are positioned correspondingly, so that the protective airbags are arranged in a matrix as a whole to form a protective airbag array.

[0021] Furthermore, the support mechanism is provided with an air circuit control system, and the air circuit control system includes:

[0022] an air source, the air source supplying air to the protective airbag array from one side of the protective airbag array;

[0023] Gas branch pipelines, a plurality of the gas branch pipelines are arranged on the support frame and the circulating track and connected to the protective airbags; in the protective airbag array, the adjacent protective airbags on the same circulating track and the adjacent protective airbags on adjacent circulating tracks are connected respectively through the gas branch pipelines;

[0024] The exhaust end of the gas branch pipeline is connected to the protective airbag in the protective airbag array, which is far away from the gas source;

[0025] A main gas pipeline, wherein a gas input port of the main gas pipeline is connected to the gas source, and a gas output port of the main gas pipeline is connected to the gas inlet end of the gas branch pipeline.

[0026] Furthermore, the gas path control system further includes:

[0027] A gas source processing dual-joint, which is arranged on the gas main line and is used to control the gas flow size and gas flow direction in the gas main line;

[0028] An unloading valve, which is arranged on the main gas line and is located between the gas source processing dual-joint and the gas output port of the main gas line;

[0029] Solenoid valves, wherein the solenoid valves are respectively arranged on the main gas pipeline, the gas branch pipelines between adjacent protective airbags, the gas inlet ends of the gas branch pipelines, and the gas exhaust ends of the gas branch pipelines;

[0030] A pressure measuring device, wherein a plurality of the pressure measuring devices are respectively connected to the unloading valve and the protective airbag.

[0031] A second aspect of the present invention provides a method for controlling a mobile airbag protection platform, which uses the mobile airbag protection platform described in the first aspect and includes the following steps:

[0032] Set the preset pressure value of the protective airbag, and obtain the internal pressure value of the protective airbag in the inflated support state in real time;

[0033] Based on the internal pressure value of the protective airbag and the preset pressure value of the protective airbag, the pressure state of the protective airbag is determined;

[0034] Based on the pressure state of the protective airbag, determine the position of the target protective airbag in the protective airbag array;

[0035] Based on the pressure state of the protective airbag and the position of the target protective airbag in the protective airbag array, the air path control system is adjusted so that the internal pressure value of the protective airbag in the inflated support state matches the preset pressure value of the protective airbag.

[0036] Furthermore, the method for determining the pressure state of the protective airbag includes:

[0037] Compare the real-time internal pressure value of the protective airbag with the preset pressure value of the protective airbag;

[0038] If the internal pressure value of the protective airbag is greater than the safety limit of the preset pressure value of the protective airbag, it is determined that the protective airbags in the protective airbag array are in an overpressure state;

[0039] If the internal pressure value of the protective airbag is less than the preset pressure value of the protective airbag, it is determined that a protective airbag in the protective airbag array is in a leaking state.

[0040] Furthermore, the method for adjusting the gas path control system includes:

[0041] When the protective airbags in the protective airbag array are in an overpressure state, the protective airbags are exhausted and depressurized through the air path control system until the internal pressure value of the protective airbags is less than or equal to the safety limit of the preset pressure value of the protective airbags.

[0042] Furthermore, the method for adjusting the gas path control system also includes:

[0043] When a protective airbag in the protective airbag array is in a leaking state, the gas connection between the protective airbag in the leaking state and the adjacent protective airbags is disconnected.

[0044] The beneficial effects of the present invention are:

[0045] The present application adopts a design in which several protective airbags move cyclically at a set rate on a circulating track, so that the mobile airbag protective platform can achieve the technical effect of continuously supporting the tunnel surrounding rock during the movement; the mobile airbag protective platform provided by the present application can distribute the gas pressure to the protective airbags in the inflated support state connected to it through the air circuit control system when a single or several local protective airbags in the inflated support state are impacted; when a single or several local protective airbags in the inflated support state are impacted by a value greater than a certain value, the air circuit control system can be used to relieve pressure to ensure that the internal pressure of the protective airbag is stable, thereby achieving the technical effect of the support mechanism providing constant resistance, thereby improving the operating safety of the protective platform under complex geological conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 A schematic diagram of the overall structure of a mobile airbag protection stand provided in an embodiment of the present invention;

[0047] Figure 2 A schematic diagram of the connection relationship between the support frame and the circulating track provided in an embodiment of the present invention;

[0048] Figure 3 A side view of a circulating track provided in an embodiment of the present invention;

[0049] Figure 4 A schematic diagram of the structure of a protective airbag provided in an embodiment of the present invention;

[0050] Figure 5 A schematic diagram comparing the protective airbag provided in an embodiment of the present invention in an inflated supporting state and in a deflated moving state;

[0051] Figure 6 A schematic diagram of the relationship between the position of a mobile airbag protection stand provided in an embodiment of the present invention and the tunnel when the mobile airbag protection stand moves as a whole in the tunnel;

[0052] Figure 7 A schematic diagram of the supporting effect provided by a mobile airbag protection stand for tunnel surrounding rocks during its movement provided in an embodiment of the present invention;

[0053] Figure 8 A schematic diagram of the structure of a gas circuit control system provided in an embodiment of the present invention;

[0054] Fig. 9 A schematic diagram of a protective airbag in a working area of ​​a protective airbag array according to an embodiment of the present invention;

[0055] Fig.10 This is a schematic diagram of the working area after the protective airbag array is moved according to an embodiment of the present invention;

[0056] The markings in the figure are as follows:

[0057] 1. Walking mechanism;

[0058] 2. Support mechanism;

[0059] 21. Support frame; 211. First card slot; 22. Circulation track; 221. Track body; 2211. Second card slot; 222. Driving device; 223. Chain plate; 23. Protective airbag; 231. Rigid base; 232. Flexible capsule;

[0060] 3. Gas control system; 31. Gas source; 32. Gas main pipeline; 33. Gas branch pipeline; 34. Gas source processing two-piece; 35. Unloading valve; 36. Solenoid valve; 37. Pressure measuring device. DETAILED DESCRIPTION

[0061] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0062] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0063] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0064] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in the field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0065] See also Figures 1 to 10The embodiment of the present application shown provides a mobile airbag protection platform, which belongs to tunnel excavation equipment. In actual application, it is set in the tunnel surrounding rock and is used to provide a constant support force to the tunnel surrounding rock before the concrete lining construction stage of the tunnel surrounding rock, control the deformation of the surrounding rock and release the internal stress under constant resistance, so as to achieve the effect of re-stabilizing the tunnel surrounding rock, thereby ensuring the safety of workers and equipment in the tunnel. The mobile airbag protection platform provided by the present application includes: a walking mechanism 1 and a supporting mechanism 2; wherein the walking mechanism 1 is used to drive the supporting mechanism 2 to move axially along the tunnel surrounding rock; it can be understood that the walking mechanism 1 can adopt a crawler structure, such as a crawler chassis; it can also adopt a wheel-rail structure, a chain structure, and other trolley general drive structures that can achieve a driving effect.

[0066] In this embodiment, in order to enable the mobile airbag protection stand to effectively support the inner side of the tunnel surrounding rock while the walking mechanism 1 is moving, please refer to Figure 1 and Figure 2 The support mechanism 2 includes: a support frame 21, a circulating track 22 and a protective airbag 23; as an embodiment of the present application, the support frame 21 is an arched strip structure; it can be understood that the support frame 21 can also adopt other structures that match the axial longitudinal section of the tunnel, such as a circular ring structure, a horseshoe structure, a rectangular frame, etc.; the gap formed between the support frame 21 and the tunnel surrounding rock can at least accommodate the circulating track 22 and the protective airbag 23, so that the circulating track 22 and the protective airbag 23 can be arranged in the gap to provide support for the arch wall of the tunnel surrounding rock; the two ends of the support frame 21 are respectively connected to the walking mechanism 1, so that the support frame 21 is driven to move synchronously when the walking mechanisms 1 on both sides move; a plurality of support frames 21 are arranged in parallel along the moving direction of the walking mechanism 1, and the number of support frames 21 is determined according to the actual situation of the tunnel surrounding rock, so as to match the distance required for support of the tunnel surrounding rock and the installation and fixation of the circulating track 22.

[0067] More specifically, in the above technical solution, a plurality of first slots 211 are evenly arranged on the surface of the support frame 21 , and the first slots 211 are evenly distributed on the outer surface of the support frame 21 close to the tunnel surrounding rock and the inner surface away from the tunnel surrounding rock, for fixing the circulating track 22 .

[0068] As an implementation method of this application, please refer to Figure 2 and Figure 3The circulating track 22 includes: a track body 221, a driving device 222 and a chain plate 223; wherein the track body 221 is a strip-shaped structure as a whole, and a mounting opening is provided on its side surface, which penetrates the track body 221, and a plurality of second card grooves 2211 are evenly provided on the inner surface of the mounting opening; a plurality of support frames 21 are passed through the mounting opening, and the track body 221 and the support frame 21 are fixedly connected by the interference fit of the first card groove 211 and the second card groove 2211; it can be understood that the track body 221 and the support frame 21 can also be connected by welding or other connection methods that can achieve a fixing effect.

[0069] The driving device 222 can adopt a driving hydraulic motor. The two driving devices 222 are respectively fixed at the two ends of the track body 221. The driving device 222 starts and runs synchronously when the walking mechanism 1 moves. When the driving device 222 adopts a driving hydraulic motor, the rotating shafts of the two driving hydraulic motors are parallel to each other and perpendicular to the moving direction of the walking mechanism 1. During the movement of the walking mechanism 1, the rotating shafts of the two driving hydraulic motors rotate synchronously in the same direction and speed.

[0070] The chain plate 223 adopts a crawler structure, and the chain plate 223 is wound around the outer side of the driving device 222. After the driving device 222 is started, it can drive the chain plate 223 to circulate around the track body 221; the chain plate 223 provides a fixed position for the protective airbag 23, and plays a role in driving the protective airbag 23 to move synchronously. The circulating track 22 drives the protective airbag 23 to move through the chain plate 223 to achieve the effect of conveying the protective airbag 23;

[0071] More specifically, the portion where the chain plate 223 contacts the driving device 222 is an arc-shaped turning section, and the portion of the chain plate 223 parallel to the track body 221 is a straight transmission section; the moving direction of the straight transmission section of the chain plate 223 is parallel to the moving direction of the walking mechanism 1, that is, the transmission direction of the circulating track 22 is parallel to the moving direction of the walking mechanism 1; in the present embodiment, any track body 221 is parallel to the traveling direction of the walking mechanism 1, so that the transmission directions of each circulating track 22 are parallel to each other; for the convenience of subsequent description, the straight transmission section on the chain plate 223 located on the outside of the support frame 21 is collectively referred to as the "A side straight transmission section", and the straight transmission section on the chain plate 223 located on the inside of the support frame 21 is collectively referred to as the "B side straight transmission section".

[0072] A number of protective airbags 23 are fixed on the chain plate 223. When the driving device 222 drives the chain plate 223 to move, the protective airbags 23 are transported and moved along the transport direction of the circulating track 22. When the protective airbags 23 move to between the circulating track 22 and the tunnel surrounding rock, they can bear the pressure applied by the tunnel surrounding rock and transfer the pressure to the circulating track 22 and the supporting frame 21, so that while the walking mechanism 1 drives the supporting mechanism 2 to move, the supporting mechanism 2 forms support on the inner side of the tunnel surrounding rock.

[0073] In order to facilitate the movement of the mobile airbag protection stand in the tunnel and ensure that the protective airbag 23 between the circulating track 22 and the tunnel surrounding rock is in an effective supporting state, as a preferred embodiment of the present application, please refer to Figure 4 and Figure 5 The protective airbag 23 includes: a rigid base 231 and a flexible capsule 232; wherein the rigid base 231 is located on the surface of the chain plate 223 and is rigidly connected to the chain plate 223, and is used to carry the flexible capsule 232; the flexible capsule 232 is connected to the side of the rigid base 231 away from the chain plate 223, and a cavity for accommodating gas is provided inside the flexible capsule 232, and the protective airbag 23 can be switched between an inflated support state and a deflated moving state by inflating / deflation operations on the cavity.

[0074] See also Figure 6 When the mobile airbag protection platform moves as a whole in the tunnel, all the protection airbags 23 are in a deflated moving state. At this time, there is no contact between the protection airbags 23 and the surrounding rock of the tunnel, which will not hinder the overall movement of the mobile airbag protection platform; please refer to Figure 7 When the mobile airbag protection platform needs to implement tunnel surrounding rock support during movement, the flexible bladder 232 entering the linear transmission section on the chain plate 223A side is inflated to make the corresponding protective airbag 23 in an inflated support state, and the flexible bladder 232 leaving the linear transmission section on the chain plate 223A side is deflated to make the corresponding protective airbag 23 in a deflated moving state; the protective airbag 23 in the deflated moving state is easy to enter the narrow gap between the chain plate 223 and the tunnel surrounding rock, and after the protective airbag 23 enters the linear transmission section on the chain plate 223A side, the end of the flexible bladder 232 faces the surface of the tunnel surrounding rock. In this state, the inflated flexible bladder 232 is in full contact with the tunnel surrounding rock, so that the protective airbag 23 can form an effective support form; adopting this technical solution can effectively avoid the problem that the protective airbag 23 directly enters the gap between the tunnel surrounding rock and the chain plate 223 in the inflated support state, and the flexible bladder 232 is easily damaged by friction.

[0075] In the above technical scheme, the speed at which the driving device 222 drives the chain plate 223 to move matches the moving speed of the traveling mechanism 1, that is, the transmission speed of the circulating track 22 matches the moving speed of the traveling mechanism 1, so that when the protective airbag 23 moves to between the circulating track 22 and the tunnel surrounding rock, its position with respect to the tunnel surrounding rock is relatively fixed; it can be understood that in the above technical scheme, when the traveling mechanism 1 moves to either side of the tunnel axis, the moving direction of the straight transmission section on the chain plate 223A side is opposite to the moving direction of the traveling mechanism 1; by adopting this technical scheme, in the process of the mobile airbag protection stand moving as a whole through the traveling mechanism 1, there is no relative movement between the protective airbag 23 located in the straight transmission section on the chain plate 223A side and the tunnel surrounding rock, and uninterrupted continuous support can be provided at the same position of the tunnel surrounding rock.

[0076] The present application adopts a design in which a limited number of protective airbags 23 move cyclically at a set rate on a circulating track 22, so that the mobile airbag protection stand can achieve the technical effect of continuously supporting the tunnel surrounding rock during the movement.

[0077] In the above technical solution, the protective airbags 23 on the same circulating track 22 are evenly spaced; the positions of the protective airbags 23 on adjacent circulating tracks 22 correspond to each other, so that the protective airbags 23 are arranged in a matrix as a whole to form a protective airbag array; in the protective airbag array, the protective airbags 23 on the same circulating track 22 are located in the same column of the protective airbag array, and the protective airbags 23 on the same axial longitudinal section of the tunnel are located in the same row of the protective airbag array; the support mechanism 2 is also provided with an air path control system 3, which is connected to the protective airbags 23 and is used to control the inflation / deflation state of the protective airbags 23; please refer to Figure 8The gas circuit control system 3 includes: a gas source 31, a gas main line 32 and a plurality of gas branch lines 33; wherein the gas source 31 is used to supply gas to the protective airbag array from one side of the protective airbag array. As an embodiment of the present application, the gas source 31 can be an air compressor; the gas input port of the gas main line 32 is connected to the gas source 31, and is used to transport the gas output by the gas source 31; the plurality of gas branch lines 33 are arranged on the support frame 21 and the circulation track 22, and are connected to the protective airbags 23, so that the adjacent protective airbags 23 on the same circulation track 22 and the adjacent protective airbags 23 on the adjacent circulation tracks 22 are connected, and the above-mentioned The connection method can distribute the internal pressure to the surrounding adjacent protective airbags 23 through the gas branch pipe 33 when a single or multiple protective airbags 23 are impacted, and the adjacent protective airbags 23 continue to distribute the pressure in the same way, and finally disperse the pressure to the entire protective airbag array, thereby enhancing the impact resistance of the protective airbags 23; the air inlet end of the gas branch pipe 33 is connected to the gas outlet of the gas main pipe 32 through a rotating gas joint, so that the gas output by the gas source 31 can be delivered to each protective airbag 23, and the exhaust end of the gas branch pipe 33 is connected to the protective airbag 23 on the side of the protective airbag array away from the gas source 31.

[0078] In this embodiment, the gas circuit control system 3 also includes: a gas source processing dual-joint 34, a relief valve 35, a plurality of solenoid valves 36 and a plurality of pressure measuring devices 37; wherein the gas source processing dual-joint 34 is arranged on the gas main line, and is used to control the gas flow size and gas flow direction in the gas main line 32, so as to achieve the control effect of the internal pressure of the gas circuit control system 3; the relief valve 35 is connected to the gas main line 32, and is located between the gas source processing dual-joint 34 and the gas output port of the gas main line 32, and is used to relieve the pressure and exhaust the gas when the internal pressure of the protective airbag 23 exceeds the preset pressure value, so as to restore the internal pressure of the protective airbag 23 to below the preset pressure value. With this design, in the protective airbag array, the protective airbag 2 in the inflated support state 3 is regulated by the main gas line 32, thereby reducing the sensitivity of the system; a plurality of solenoid valves 36 are respectively connected to the main gas line 32, the air inlet end of the gas branch line 33, the gas branch line 33 between adjacent protective airbags 23, and the exhaust end of the gas branch line 33; the solenoid valve 36 can be a two-position two-way solenoid valve, which is used to control the on-off state of the gas between the main gas line 32 and the protective airbag 23, and between adjacent protective airbags 23, so as to control the number of protective airbags 23 in the inflated support state; a plurality of pressure measuring devices 37 are respectively connected to the unloading valve 35 and the protective airbag 23 for pressure monitoring, and the pressure measuring device 37 can be a pressure gauge or a digital pressure detector.

[0079] It should be noted that, when the protective airbag 23 moves from the arc-shaped turning section of the chain plate 223 to the straight transmission section on the A side, the point where the arc-shaped turning section passed by the protective airbag 23 connects with the straight transmission section on the A side is the inflation support point; when the protective airbag 23 moves from the straight transmission section on the A side of the chain plate 223 to the arc-shaped turning section, the point where the straight transmission section on the A side passed by the protective airbag 23 connects with the arc-shaped turning section is the deflation moving point; based on the above, it can be understood that the air path control system 3 inflates the protective airbag 23 when the protective airbag 23 moves to the inflation support point, and deflates the protective airbag 23 when the protective airbag 23 moves to the deflation moving point.

[0080] Working principle: The air path control system 3 of the present application can control the support mechanism 2 to cooperate with the traveling mechanism 1 in motion; during the process, when a row of protective airbags 23 in the protective airbag array moves as a whole to the inflation support point, the corresponding solenoid valve 36 is opened to connect the protective airbags 23 in the row with the protective airbags 23 in the inflation support state in the protective airbag array; at the same time, the gas output by the gas source 31 enters the protective airbags 23 in the row from the air inlet end of the gas branch pipeline 33, completing the conversion of the inflation / deflation state of the protective airbags 23 in the row;

[0081] When a row of protective airbags 23 in the protective airbag array moves as a whole to the deflation moving point, the corresponding solenoid valve 36 is closed to disconnect the gas connection between the protective airbags 23 in this row and the protective airbags 23 in other rows in the protective airbag array; at the same time, the gas in the protective airbags 23 in this row is discharged from the gas control system 3 through the exhaust end of the gas branch pipeline 33, completing the conversion of the inflation / deflation state of the protective airbags 23 in this row.

[0082] The present application controls the state of the protective airbag 23 through the air circuit control system 3, and can inflate / deflate the protective airbag 23 after it moves to the specified position; and the protective airbags 23 in the inflated support state are interconnected through the gas branch pipeline 33, which increases the upper limit of the impact force that a single protective airbag 23 can withstand; the air circuit control system 3 cooperates with the walking mechanism 1 and the supporting mechanism 2 to jointly achieve the support effect of the tunnel surrounding rock.

[0083] As an embodiment of the present application, the protective airbag array is arranged in the form of 6 rows * 3 columns, that is, three circulating tracks 22 are provided on the support frame 21, and six protective airbags 23 are provided on a single circulating track 22; please refer to Fig. 9 In this embodiment, the protective airbag array is arranged from the first to the sixth rows from top to bottom, and from the first to the sixth columns from left to right; among them, the protective airbags 23 in the second to the fourth rows are respectively located on the A-side conveying sections of the corresponding chain plates 223 and are in an inflated support state, that is, the protective airbags 23 in the second to the fourth rows are in the working area.

[0084] Before inflation, the support mechanism 2 in the initial state has the solenoid valve 36 on the gas main line 32, the solenoid valve 36 between the protective airbag 23 and the rotary gas joint in the working area, and the solenoid valve 36 between the protective airbags 23 in the working area in an open state, and the remaining solenoid valves 36 are all in a closed state; the gas source 31 is started to inflate the protective airbags 23 in the working area, so that the protective airbags 23 in the working area are in an inflated support state, and the gas between them is connected.

[0085] During the forward movement of the walking mechanism 1, the working area moves forward synchronously; after the protective airbags 23 in the first row move to the inflation support point, they are converted from the deflated moving state to the inflation support state, and are gas-connected with other protective airbags 23 in the working area, thereby joining the working area; specifically, when the protective airbags 23 in the first row move to the inflation support point, the solenoid valve 36 between the protective airbags 23 in the first row and the rotary air joint, and the solenoid valve 36 between the protective airbags 23 in the first row are opened; after the protective airbags 23 in the first row are in the inflation support state, the solenoid valve 36 between the protective airbags in the first row and the protective airbags in the second row are opened, so that the protective airbags in the first row are gas-connected with other protective airbags 23 in the working area, completing the operation of joining the protective airbags in the first row to the working area.

[0086] During the process of the protective airbags 23 in the first row joining the working area; the protective airbags 23 in the fourth row move to the deflated moving point, and are converted from the inflated support state to the deflated moving state, and the gas connection with the protective airbags 23 in the working area is disconnected, thereby exiting the working area; specifically, when the protective airbags 23 in the fourth row move to the deflated moving point, the solenoid valve 36 between the protective airbags 23 in the fourth row and the rotary gas joint, and the solenoid valve 36 between the protective airbags 23 in the fourth row and the protective airbags 23 in the third row are closed; the gas connection between the protective airbags 23 in the fourth row and other protective airbags 23 in the working area is disconnected; the solenoid valve 36 located on the exhaust port of the gas branch pipeline 33 on one side of the protective airbags 23 in the fourth row is opened, the gas in the protective airbags 23 in the fourth row is discharged, and the operation of the protective airbags 23 in the fourth row exiting the working area is completed.

[0087] See also Fig. 9 and Fig.10 In the above embodiment, when the walking mechanism 1 moves, the support provided by the protective airbags 23 in the second to fourth rows is gradually switched to the support provided by the protective airbags 23 in the first to third rows, thereby achieving the effect of moving the working area forward as a whole while the protective airbags 23 provide support in situ; it is understandable that when the walking mechanism 1 continues to move forward, the same method can be used to control the protective airbags 23 to enter and exit the working area, thereby achieving the overall movement of the mobile airbag protection stand.

[0088] The present invention further provides a control method for a mobile airbag protection platform in this embodiment. The control method adopts the mobile airbag protection platform in the above technical solution. The control method is used to maintain the internal pressure of the protection airbag 23 stable when multiple protection airbags 23 in a single or local area are subjected to strong impact or leakage. Specifically, the control method steps include:

[0089] Setting a preset pressure value of the protective airbag 23, and obtaining in real time the internal pressure value of the protective airbag 23 in the inflated support state of the protective airbag 23;

[0090] In this step, the preset pressure value of the protective airbag 23 is set according to the pressure actually required for tunnel surrounding rock support;

[0091] The internal pressure value of the protective airbag 23 of the protective airbag 23 in the inflated support state is obtained in real time through the pressure measuring device 37. When the pressure measuring device 37 adopts a digital pressure detector, the internal pressure values ​​of the protective airbag 23 of several protective airbags 23 can be automatically obtained by connecting the digital pressure detector to the PLC controller; when the pressure measuring device 37 adopts a mechanical pressure gauge, the internal pressure value of the protective airbag 23 of the protective airbag 23 can be obtained by manual on-site reading.

[0092] The pressure state of the protective airbag 23 is determined based on the internal pressure value of the protective airbag 23 and the preset pressure value of the protective airbag 23 .

[0093] In this step, the real-time internal pressure value of the protective airbag 23 is compared with the preset pressure value of the protective airbag 23; if the internal pressure value of the protective airbag 23 is greater than the safety limit of the preset pressure value of the protective airbag 23, it is determined that the protective airbags 23 in the protective airbag array are in an overpressure state; the protective airbags 23 in the overpressure state are at risk of rupture and failure; the safety limit of the preset pressure value of the protective airbag 23 = the preset pressure value of the protective airbag 23 * η; wherein η>100%, η is a floating value, and its actual value needs to be set according to the on-site geological survey data of the tunnel surrounding rock.

[0094] If the internal pressure value of the protective airbag 23 is less than the preset pressure value of the protective airbag 23, it is determined that a protective airbag 23 in the protective airbag array is in a leaking state; the protective airbag 23 in a leaking state cannot provide effective support for the tunnel surrounding rock.

[0095] Based on the pressure state of the protective airbag 23, determine the position of the target protective airbag 23 in the protective airbag array;

[0096] In this step, since the gas between the inflated protective airbags 23 in the protective airbag array is connected, when the protective airbags 23 in the protective airbag array are in an overpressure state, there is no need to locate the target protective airbag 23; when there is a protective airbag 23 in the protective airbag array that is in a leaking state, it is determined that the target protective airbag 23 is the protective airbag 23 in a leaking state, and at this time, the position of the protective airbag 23 in the leaking state in the protective airbag array needs to be obtained through the pressure measuring device 37.

[0097] Based on the pressure state of the protective airbag 23 and the position of the target protective airbag 23 in the protective airbag array, the air path control system 3 is adjusted to make the internal pressure value of the protective airbag 23 in the inflated support state match the preset pressure value of the protective airbag 23.

[0098] In this step, when the protective airbag 23 in the protective airbag array is in an overpressure state, the protective airbag 23 is exhausted and depressurized through the air path control system 3 until the internal pressure value of the protective airbag 23 is less than or equal to the safety limit of the preset pressure value of the protective airbag 23;

[0099] As an implementation mode of the present application, the protective airbag 23 is exhausted and depressurized through the unloading valve 35 on the gas main pipe 32. As the unloading valve 35 is exhausted and depressurized, the internal pressure value of the protective airbag 23 continues to decrease until it is less than or equal to the safety limit of the preset pressure value of the protective airbag 23, and the unloading valve 35 is closed. According to the above steps, the internal pressure value of the protective airbag 23 is obtained again in real time. If it is less than the preset pressure value of the protective airbag 23, the solenoid valve 36 on the gas main pipe 32 is opened to replenish gas to the protective airbag 23 to increase the pressure.

[0100] When a protection airbag 23 in the protection airbag array is in a leaking state, the gas connection between the protection airbag 23 in the leaking state and the adjacent protection airbags 23 is disconnected based on the position of the protection airbag 23 in the protection airbag array.

[0101] As an implementation mode of the present application, when a single protective airbag 23 is in a leakage state, four solenoid valves 36 adjacent to the protective airbag 23 are closed, thereby disconnecting the gas connection between the protective airbag 23 and the adjacent protective airbags 23; when several adjacent protective airbags 23 are in a leakage state, all solenoid valves 36 adjacent to the protective airbags 23 in the leakage state must be closed to isolate the protective airbags 23 in a certain area.

[0102] Through the above-mentioned control method, the present application can distribute the gas pressure to the protective airbags 23 in the inflated support state connected to it through the gas branch pipe 33 when a single or local protective airbags 23 in the inflated support state is impacted, and finally disperse it to the entire protective airbag array, and all protective airbags 23 in the inflated support state jointly bear the impact; when the impact received by a single or local protective airbags 23 in the inflated support state is greater than a certain value, the pressure can be relieved through the air circuit control system 3 to ensure that the internal pressure of the protective airbag 23 is stable, thereby achieving the technical effect of the support mechanism 2 providing constant resistance, thereby improving the operating safety of the protective platform under complex geological conditions.

[0103] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A mobile airbag protection stand, characterized in that: include: A walking mechanism and a supporting mechanism arranged above the walking mechanism; The walking mechanism is used to drive the supporting mechanism to move axially along the surrounding rock of the tunnel; The supporting mechanism comprises: A support frame, wherein the support frame is an arched strip structure, both ends of which are respectively connected to the walking mechanism, and a plurality of the support frames are arranged in parallel along the moving direction of the walking mechanism; Circulating tracks, a plurality of the circulating tracks are connected to the supporting frame, and the conveying direction of the circulating tracks is parallel to the moving direction of the walking mechanism; Protective airbags, a plurality of said protective airbags are fixed on said circulating track and are transported and moved along the transport direction of said circulating track; The transmission rate of the circulating track matches the moving rate of the walking mechanism, so that when the protective airbag moves between the circulating track and the tunnel surrounding rock, its position with respect to the tunnel surrounding rock is relatively fixed.

2. A mobile airbag protection stand according to claim 1, characterized in that: The circulating track comprises: A track body, wherein the track body is in a strip-shaped structure as a whole and is provided with a mounting opening, and a plurality of the support frames are connected to the mounting opening; A driving device, wherein two driving devices are respectively fixed at two ends of the track body; A chain plate is arranged around the outer sides of the two driving devices, and the chain plate is driven by the driving devices to circulate around the track body.

3. A mobile airbag protection stand according to claim 2, characterized in that: The protective airbag comprises: A rigid base, the rigid base is located on the surface of the chain plate and is rigidly connected to the chain plate; A flexible sac is connected to a side of the rigid base away from the chain plate, and a cavity for accommodating gas is provided inside the flexible sac.

4. The mobile airbag protection stand according to claim 1, characterized in that: The protective airbags on the same circulating track are evenly spaced apart; the protective airbags on adjacent circulating tracks are positioned correspondingly, so that the protective airbags are arranged in a matrix as a whole to form a protective airbag array.

5. The mobile airbag protection stand according to claim 4, characterized in that: The support mechanism is provided with an air circuit control system, and the air circuit control system comprises: an air source, the air source supplying air to the protective airbag array from one side of the protective airbag array; Gas branch pipelines, a plurality of the gas branch pipelines are arranged on the support frame and the circulating track and connected to the protective airbags; in the protective airbag array, the adjacent protective airbags on the same circulating track and the adjacent protective airbags on adjacent circulating tracks are connected respectively through the gas branch pipelines; The exhaust end of the gas branch pipeline is connected to the protective airbag in the protective airbag array, which is far away from the gas source; A main gas pipeline, wherein a gas input port of the main gas pipeline is connected to the gas source, and a gas output port of the main gas pipeline is connected to the gas inlet end of the gas branch pipeline.

6. The mobile airbag protection stand according to claim 5, characterized in that: The gas circuit control system also includes: A gas source processing dual-joint, which is arranged on the gas main line and is used to control the gas flow size and gas flow direction in the gas main line; An unloading valve, which is arranged on the main gas line and is located between the gas source processing dual-joint and the gas output port of the main gas line; Solenoid valves, wherein the solenoid valves are respectively arranged on the main gas pipeline, the gas branch pipelines between adjacent protective airbags, the gas inlet ends of the gas branch pipelines, and the gas exhaust ends of the gas branch pipelines; A pressure measuring device, wherein a plurality of the pressure measuring devices are respectively connected to the unloading valve and the protective airbag.

7. A method for controlling a mobile airbag protection stand, characterized in that: The mobile airbag protection stand according to any one of claims 5 to 6 comprises the following steps: Set the preset pressure value of the protective airbag, and obtain the internal pressure value of the protective airbag in the inflated support state in real time; Based on the internal pressure value of the protective airbag and the preset pressure value of the protective airbag, the pressure state of the protective airbag is determined; Based on the pressure state of the protective airbag, determine the position of the target protective airbag in the protective airbag array; Based on the pressure state of the protective airbag and the position of the target protective airbag in the protective airbag array, the air path control system is adjusted so that the internal pressure value of the protective airbag in the inflated support state matches the preset pressure value of the protective airbag.

8. A method for controlling a mobile airbag protection platform according to claim 7, characterized in that: The method for determining the pressure state of the protective airbag comprises: Compare the real-time internal pressure value of the protective airbag with the preset pressure value of the protective airbag; If the internal pressure value of the protective airbag is greater than the safety limit of the preset pressure value of the protective airbag, it is determined that the protective airbags in the protective airbag array are in an overpressure state; If the internal pressure value of the protective airbag is less than the preset pressure value of the protective airbag, it is determined that a protective airbag in the protective airbag array is in a leaking state.

9. A method for controlling a mobile airbag protection platform according to claim 8, characterized in that: The method for adjusting the gas path control system comprises: When the protective airbags in the protective airbag array are in an overpressure state, the protective airbags are exhausted and depressurized through the air path control system until the internal pressure value of the protective airbags is less than or equal to the safety limit of the preset pressure value of the protective airbags.

10. The control method of a mobile airbag protection platform according to claim 8, characterized in that: The method for adjusting the gas path control system also includes: When a protective airbag in the protective airbag array is in a leaking state, the gas connection between the protective airbag in the leaking state and the adjacent protective airbags is disconnected.

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